xnu-792.25.20.tar.gz

[apple/xnu.git] / osfmk / ppc / hw_exception.s

diff --git a/osfmk/ppc/hw_exception.s b/osfmk/ppc/hw_exception.s
index af24433e1d5aff63f2ede45cee39633a53a72cee..4c66797de05f8eb5904771f462133ad8960d84f5 100644 (file)
--- a/osfmk/ppc/hw_exception.s
+++ b/osfmk/ppc/hw_exception.s
@@ -1,5 +1,5 @@
 /*
 /*

- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2005 Apple Computer, Inc. All rights reserved.

  *
  * @APPLE_LICENSE_HEADER_START@
  * 
  *
  * @APPLE_LICENSE_HEADER_START@
  * 


@@ -36,6 +36,7 @@
 #include <debug.h>
 #include <mach_assert.h>
 #include <mach/exception_types.h>
 #include <debug.h>
 #include <mach_assert.h>
 #include <mach/exception_types.h>

+#include <mach/kern_return.h>

 #include <mach/ppc/vm_param.h>
 
 #include <assym.s>
 #include <mach/ppc/vm_param.h>
 
 #include <assym.s>


@@ -44,12 +45,14 @@
 #include <ppc/proc_reg.h>
 #include <ppc/trap.h>
 #include <ppc/exception.h>
 #include <ppc/proc_reg.h>
 #include <ppc/trap.h>
 #include <ppc/exception.h>

-#include <ppc/spl.h>
+#include <ppc/savearea.h>

 
 
 #define VERIFYSAVE 0
 #define FPVECDBG 0
 
 
 #define VERIFYSAVE 0
 #define FPVECDBG 0

-       
+#define FPFLOOD 0
+#define INSTRUMENT 0
+

 /*
  * thandler(type)
  *
 /*
  * thandler(type)
  *


@@ -62,20 +65,18 @@
 
 /*
  * If pcb.ksp == 0 then the kernel stack is already busy,
 
 /*
  * If pcb.ksp == 0 then the kernel stack is already busy,

- *                 we save ppc_saved state below the current stack pointer,
+ *         we make a stack frame

  *                leaving enough space for the 'red zone' in case the
  *                trapped thread was in the middle of saving state below
  *                its stack pointer.
  *
  *                leaving enough space for the 'red zone' in case the
  *                trapped thread was in the middle of saving state below
  *                its stack pointer.
  *

- * otherwise       we save a ppc_saved_state in the pcb, and switch to
+ * otherwise       we make a stack frame and

  *                the kernel stack (setting pcb.ksp to 0)
  *
  * on return, we do the reverse, the last state is popped from the pcb
  * and pcb.ksp is set to the top of stack                  
  */
 
  *                the kernel stack (setting pcb.ksp to 0)
  *
  * on return, we do the reverse, the last state is popped from the pcb
  * and pcb.ksp is set to the top of stack                  
  */
 

-#if DEBUG
-

 /* TRAP_SPACE_NEEDED is the space assumed free on the kernel stack when
  * another trap is taken. We need at least enough space for a saved state
  * structure plus two small backpointer frames, and we add a few
 /* TRAP_SPACE_NEEDED is the space assumed free on the kernel stack when
  * another trap is taken. We need at least enough space for a saved state
  * structure plus two small backpointer frames, and we add a few


@@ -85,179 +86,181 @@
 
 #define TRAP_SPACE_NEEDED      FM_REDZONE+(2*FM_SIZE)+256
 
 
 #define TRAP_SPACE_NEEDED      FM_REDZONE+(2*FM_SIZE)+256
 

-#endif /* DEBUG */
-

                        .text
 
                        .text
 

-ENTRY(thandler, TAG_NO_FRAME_USED)     /* What tag should this have?! */
+                       .align  5
+                       .globl EXT(thandler)
+LEXT(thandler)                                                                         ; Trap handler

 
 

-                       mfsprg  r25,0                                           /* Get the per_proc */
+                       mfsprg  r13,1                                                   ; Get the current activation
+                       lwz             r25,ACT_PER_PROC(r13)                   ; Get the per_proc block 

                
                

-                       lwz             r1,PP_ISTACKPTR(r25)            ; Get interrupt stack pointer
+                       lwz             r1,PP_ISTACKPTR(r25)                    ; Get interrupt stack pointer

        
        

-
-                       lwz             r6,PP_CPU_DATA(r25)                     /* Get point to cpu specific data */
-                       cmpwi   cr0,r1,0                                        ; Are we on interrupt stack?                                    
-                       lwz             r6,CPU_ACTIVE_THREAD(r6)        /* Get the pointer to the currently active thread */
-                       beq-    cr0,EXT(ihandler)                       ; Yes, not allowed except when debugger
-                                                                                               ; is active.  We will let the ihandler do this...
-                       lwz             r13,THREAD_TOP_ACT(r6)          /* Point to the active activation */
-                       lwz             r26,ACT_MACT_BEDA(r13)          /* Pick up the pointer to the blue box data area */
-                       lwz             r8,ACT_MACT_PCB(r13)            /* Get the last savearea used */
-                       mr.             r26,r26                                         /* Do we have Blue Box Assist active? */
-                       lwz             r1,ACT_MACT_KSP(r13)            /* Get the stack */
-                       bnel-   checkassist                                     /* See if we should assist this */
-                       stw             r4,ACT_MACT_PCB(r13)            /* Point to our savearea */
-                       stw             r8,SAVprev(r4)                          /* Queue the new save area in the front */
+                       cmpwi   cr0,r1,0                                                ; Are we on interrupt stack?                                    
+                       mr              r6,r13
+                       beq-    cr0,EXT(ihandler)                               ; If on interrupt stack, treat this as interrupt...
+                       lwz             r26,ACT_MACT_SPF(r13)                   ; Get special flags
+                       lwz             r8,ACT_MACT_PCB(r13)                    ; Get the last savearea used
+                       rlwinm. r26,r26,0,bbThreadbit,bbThreadbit       ; Do we have Blue Box Assist active? 
+                       lwz             r1,ACT_MACT_KSP(r13)                    ; Get the top of kernel stack
+                       bnel-   checkassist                                             ; See if we should assist this
+                       stw             r4,ACT_MACT_PCB(r13)                    ; Point to our savearea
+                       stw             r8,SAVprev+4(r4)                                ; Queue the new save area in the front 

                        
 #if VERIFYSAVE
                        
 #if VERIFYSAVE

-                       bl              versave                                         ; (TEST/DEBUG)
+                       bl              versave                                                 ; (TEST/DEBUG)

 #endif
                        
 #endif
                        

-                       cmpwi   cr1,r1, 0                                       /* zero implies already on kstack */
-                       stw             r13,SAVact(r4)                          /* Point the savearea at its activation */
-                       bne             cr1,.L_kstackfree                       /* This test is also used below */              
-                       lwz             r1,saver1(r4)                           /* Get the stack at 'rupt time */
+                       lwz             r9,THREAD_KERNEL_STACK(r6)              ; Get our kernel stack start
+                       cmpwi   cr1,r1,0                                                ; Are we already on kernel stack?
+                       stw             r13,SAVact(r4)                                  ; Mark the savearea as belonging to this activation
+                       lwz             r26,saver1+4(r4)                                ; Get the stack at interrupt time

 
 

+                       bne+    cr1,.L_kstackfree                               ; We are not on kernel stack yet...             

 
 

-/* On kernel stack, allocate stack frame and check for overflow */
-#if DEBUG
-/*
- * Test if we will overflow the Kernel Stack. We 
- * check that there is at least TRAP_SPACE_NEEDED bytes
- * free on the kernel stack
-*/
-
-                       lwz             r7,THREAD_KERNEL_STACK(r6)
-                       addi    r7,r7,TRAP_SPACE_NEEDED
-                       cmp             cr0,r1,r7
-                       bng-    EXT(ihandler)
-#endif /* DEBUG */
-
-                       subi    r1,r1,FM_REDZONE                        /* Back up stack and leave room for a red zone */ 
+                       subi    r1,r26,FM_REDZONE                               ; Make a red zone on interrupt time kernel stack

 
 .L_kstackfree:
 
 .L_kstackfree:

-#if 0
-                       lis             r0,HIGH_ADDR(CutTrace)          /* (TEST/DEBUG) */
-                       oris    r0,r0,LOW_ADDR(CutTrace)        /* (TEST/DEBUG) */
-                       sc                                                                      /* (TEST/DEBUG) */
-#endif
-                       lwz             r7,savesrr1(r4)                         /* Pick up the entry MSR */
-                       li              r0,0                                            /* Make this 0 */
-                       
-                       beq             cr1,.L_state_on_kstack          /* using above test for pcb/stack */
+                       lwz             r31,savesrr1+4(r4)                              ; Pick up the entry MSR 
+                       sub             r9,r1,r9                                                ; Get displacment into the kernel stack
+                       li              r0,0                                                    ; Make this 0
+                       rlwinm. r0,r9,0,28,31                                   ; Verify that we have a 16-byte aligned stack (and get a 0)
+                       cmplwi  cr2,r9,KERNEL_STACK_SIZE                ; Do we still have room on the stack?
+                       beq             cr1,.L_state_on_kstack                  ; using above test for pcb/stack

 
 

-                       stw             r0,ACT_MACT_KSP(r13)            /* Show that we have taken the stack */
+                       stw             r0,ACT_MACT_KSP(r13)                    ; Show that we have taken the stack

 
 .L_state_on_kstack:    
 
 .L_state_on_kstack:    

-                       rlwinm. r6,r7,0,MSR_VEC_BIT,MSR_VEC_BIT ; Was vector on?
-                       lwz             r6,saver1(r4)                           /* Grab interrupt time stack */
-                       beq+    tvecoff                                         ; Vector off, do not save vrsave...
-                       lwz             r3,savevrsave(r4)                       ; Get the VRSAVE register
-                       stw             r3,liveVRS(r25)                         ; Set the live value
-
-tvecoff:       rlwinm. r3,r7,0,MSR_FP_BIT,MSR_FP_BIT   ; Was floating point on?
-                       subi    r1,r1,FM_SIZE                           /* Push a header onto the current stack */
-                       beq+    tfpoff                                          /* Floating point was off... */
-                       lwz             r3,savexfpscr(r4)                       ; Grab the just saved FPSCR
-                       stw             r3,liveFPSCR(r25)                       ; Make it the live copy
-       
-tfpoff:                stw             r6,FM_BACKPTR(r1)                       /* Link backwards */
+                       lwz             r9,savevrsave(r4)                               ; Get the VRSAVE register
+                       bne--   kernelStackUnaligned                    ; Stack is unaligned...
+                       rlwinm. r6,r31,0,MSR_VEC_BIT,MSR_VEC_BIT        ; Was vector on?
+                       subi    r1,r1,FM_SIZE                                   ; Push a header onto the current stack 
+                       bgt--   cr2,kernelStackBad                              ; Kernel stack is bogus...
+
+kernelStackNotBad:                                                                     ; Vector was off
+                       beq++   tvecoff                                                 ; Vector off, do not save vrsave...
+                       stw             r9,liveVRS(r25)                                 ; Set the live value
+
+tvecoff:       stw             r26,FM_BACKPTR(r1)                              ; Link back to the previous frame

 
 #if    DEBUG
 /* If debugging, we need two frames, the first being a dummy
  * which links back to the trapped routine. The second is
  * that which the C routine below will need
  */
 
 #if    DEBUG
 /* If debugging, we need two frames, the first being a dummy
  * which links back to the trapped routine. The second is
  * that which the C routine below will need
  */

-                       lwz             r3,savesrr0(r4)                         /* Get the point of interruption */
-                       stw             r3,FM_LR_SAVE(r1)                       /* save old instr ptr as LR value */
-                       stwu    r1,     -FM_SIZE(r1)                    /* and make new frame */
+                       lwz             r3,savesrr0+4(r4)                               ; Get the point of interruption
+                       stw             r3,FM_LR_SAVE(r1)                               ; save old instr ptr as LR value 
+                       stwu    r1,     -FM_SIZE(r1)                            ; and make new frame 

 #endif /* DEBUG */
 
 #endif /* DEBUG */
 

+                       mr              r30,r4
+                       lwz             r3,SAVtime+4(r4)
+                       addi    r4,r13,SYSTEM_TIMER
+                       bl              EXT(timer_event)

 
 /* call trap handler proper, with
 
 /* call trap handler proper, with

- *   ARG0 = type               (not yet, holds pcb ptr)
- *   ARG1 = saved_state ptr    (already there)
- *   ARG2 = dsisr              (already there)
- *   ARG3 = dar                        (already there)
+ *   ARG0 = type
+ *   ARG1 = saved_state ptr
+ *   ARG2 = dsisr
+ *   ARG3 = dar

  */
 
  */
 

-
-                       lwz             r3,saveexception(r4)            /* Get the exception code */
-                       lwz             r0,ACT_MACT_SPF(r13)            ; Get the special flags
+                       mr              r4,r30
+                       lwz             r3,saveexception(r30)                   ; Get the exception code 
+                       lwz             r0,ACT_MACT_SPF(r13)                    ; Get the special flags

                        
                        

-                       addi    r5,r3,-T_DATA_ACCESS            ; Adjust to start of range
+                       addi    r5,r3,-T_DATA_ACCESS                    ; Adjust to start of range

                        rlwinm. r0,r0,0,runningVMbit,runningVMbit       ; Are we in VM state? (cr0_eq == 0 if yes)
                        rlwinm. r0,r0,0,runningVMbit,runningVMbit       ; Are we in VM state? (cr0_eq == 0 if yes)

-                       cmplwi  cr2,r5,T_RUNMODE_TRACE-T_DATA_ACCESS    ; Are we still in range? (cr_gt if not)
+                       cmplwi  cr2,r5,T_TRACE-T_DATA_ACCESS    ; Are we still in range? (cr_gt if not)

                        
                        

-                       lwz             r5,savedsisr(r4)                        /* Get the saved DSISR */
+                       lwz             r5,savedsisr(r4)                                ; Get the saved DSISR

                        
                        

-                       crnor   cr7_eq,cr0_eq,cr2_gt            ; We should intercept if in VM and is a true trap (cr7_eq == 1 if yes)
-                       rlwinm. r0,r7,0,MSR_PR_BIT,MSR_PR_BIT   ; Are we trapping from supervisor state? (cr0_eq == 1 if yes)
+                       crnor   cr7_eq,cr0_eq,cr2_gt                    ; We should intercept if in VM and is a true trap (cr7_eq == 1 if yes)
+                       rlwinm. r0,r31,0,MSR_PR_BIT,MSR_PR_BIT  ; Are we trapping from supervisor state? (cr0_eq == 1 if yes)

 
 

-                       cmpi    cr2,r3,T_PREEMPT                        ; Is this a preemption?
+                       cmpi    cr2,r3,T_PREEMPT                                ; Is this a preemption?
+
+                       beq--   .L_check_VM
+                       stw             r4,ACT_MACT_UPCB(r13)                   ; Store user savearea
+.L_check_VM:

                        
                        

-                       crandc  cr0_eq,cr7_eq,cr0_eq            ; Do not intercept if we are in the kernel (cr0_eq == 1 if yes)
+                       crandc  cr0_eq,cr7_eq,cr0_eq                    ; Do not intercept if we are in the kernel (cr0_eq == 1 if yes)

                        
                        

-                       lwz             r6,savedar(r4)                          /* Get the DAR */
+                       lwz             r6,savedar(r4)                                  ; Get the DAR (top)
+                       lwz             r7,savedar+4(r4)                                ; Get the DAR (bottom)

        
        

-                       beq-    cr2, .L_call_trap                       /* Don't turn on interrupts for T_PREEMPT */
-                       beq-    exitFromVM                                      ; Any true trap but T_MACHINE_CHECK exits us from the VM...
+                       beq-    cr2,.L_call_trap                                ; Do not turn on interrupts for T_PREEMPT
+                       beq-    exitFromVM                                              ; Any true trap but T_MACHINE_CHECK exits us from the VM...

 
 /* syscall exception might warp here if there's nothing left
  * to do except generate a trap
  */
 
 .L_call_trap:  
 
 /* syscall exception might warp here if there's nothing left
  * to do except generate a trap
  */
 
 .L_call_trap:  

-#if 0
-                       lis             r0,HIGH_ADDR(CutTrace)          /* (TEST/DEBUG) */
-                       oris    r0,r0,LOW_ADDR(CutTrace)        /* (TEST/DEBUG) */
-                       sc                                                                      /* (TEST/DEBUG) */
-#endif

 
 

+#if FPFLOOD
+                       stfd    f31,emfp31(r25)                                 ; (TEST/DEBUG)
+#endif
+                       

                        bl      EXT(trap)
 
                        bl      EXT(trap)
 

+                       lis             r10,hi16(MASK(MSR_VEC))                 ; Get the vector enable
+                       mfmsr   r7                                                              ; Get the MSR
+                       ori             r10,r10,lo16(MASK(MSR_FP)|MASK(MSR_EE)) ; Add in FP and EE
+                       andc    r7,r7,r10                                               ; Turn off VEC, FP, and EE
+                       mtmsr   r7                                                              ; Disable for interrupts
+                       mfsprg  r8,1                                                    ; Get the current activation
+                       lwz             r10,ACT_PER_PROC(r8)                    ; Get the per_proc block 

 /*
 /*

- * Ok, return from C function
- *

  * This is also the point where new threads come when they are created.
  * The new thread is setup to look like a thread that took an 
  * interrupt and went immediatly into trap.
  * This is also the point where new threads come when they are created.
  * The new thread is setup to look like a thread that took an 
  * interrupt and went immediatly into trap.

- *

  */
 
 thread_return:
  */
 
 thread_return:

+                       lwz             r11,SAVflags(r3)                                ; Get the flags of the current savearea
+                       lwz             r0,savesrr1+4(r3)                               ; Get the MSR we are going to
+                       lwz             r4,SAVprev+4(r3)                                ; Pick up the previous savearea 
+                       mfsprg  r8,1                                                    ; Get the current thread
+                       rlwinm  r11,r11,0,15,13                                 ; Clear the syscall flag
+                       rlwinm. r0,r0,0,MSR_PR_BIT,MSR_PR_BIT   ; Are we going to the user?
+                       mr              r1,r8
+                       stw             r11,SAVflags(r3)                                ; Save back the flags (with reset stack cleared) 
+                       
+                       lwz             r5,THREAD_KERNEL_STACK(r1)              ; Get the base pointer to the stack 
+                       stw             r4,ACT_MACT_PCB(r8)                             ; Point to the previous savearea (or 0 if none)
+                       addi    r5,r5,KERNEL_STACK_SIZE-FM_SIZE ; Reset to empty 

 
 

-                       mfmsr   r7                                                      /* Get the MSR */
-                       lwz             r4,SAVprev(r3)                          /* Pick up the previous savearea */
-                       rlwinm  r7,r7,0,MSR_EE_BIT+1,MSR_EE_BIT-1       /* Clear the interrupt enable mask */
-                       lwz             r11,SAVflags(r3)                        /* Get the flags of the current savearea */
-                       mtmsr   r7                                                      /* Disable for interrupts */
-               
-                       mfsprg  r10,0                                           /* Restore the per_proc info */
-                       
-                       lwz             r8,savesrr1(r3)                         ; Get the MSR we are going to
-                       lwz             r1,PP_CPU_DATA(r10)                     /* Get the CPU data area */
-                       rlwinm  r11,r11,0,15,13                         /* Clear the syscall flag */
-                       lwz             r1,CPU_ACTIVE_THREAD(r1)        /* and the active thread */
-                       rlwinm. r8,r8,0,MSR_PR_BIT,MSR_PR_BIT   ; Are we going to the user?
-                       lwz             r8,THREAD_TOP_ACT(r1)           /* Now find the current activation */
-                       stw             r11,SAVflags(r3)                        /* Save back the flags (with reset stack cleared) */
+                       beq--   chkfac                                                  ; We are not leaving the kernel yet...

 
 

-#if 0
-                       lis             r0,HIGH_ADDR(CutTrace)          /* (TEST/DEBUG) */
-                       oris    r0,r0,LOW_ADDR(CutTrace)        /* (TEST/DEBUG) */
-                       sc                                                                      /* (TEST/DEBUG) */
-#endif
-                       stw             r4,ACT_MACT_PCB(r8)                     /* Point to the previous savearea (or 0 if none) */
+                       stw             r5,ACT_MACT_KSP(r8)                             ; Save the empty stack pointer 
+                       b               chkfac                                                  ; Go end it all...

 
 

-                       beq-    chkfac                                          ; We are not leaving the kernel yet...

 
 

-                       lwz             r5,THREAD_KERNEL_STACK(r1)      /* Get the base pointer to the stack */
-                       addi    r5,r5,KERNEL_STACK_SIZE-FM_SIZE /* Reset to empty */
-                       stw             r5,ACT_MACT_KSP(r8)                     /* Save the empty stack pointer */
-                       b               chkfac                                          /* Go end it all... */
+;
+;                      Here is where we go when we detect that the kernel stack is all messed up.
+;                      We just try to dump some info and get into the debugger.
+;
+
+kernelStackBad:

 
 

+                       lwz             r3,PP_DEBSTACK_TOP_SS(r25)              ; Pick up debug stack top
+                       subi    r3,r3,KERNEL_STACK_SIZE-FM_SIZE ; Adjust to start of stack
+                       sub             r3,r1,r3                                                ; Get displacement into debug stack
+                       cmplwi  cr2,r3,KERNEL_STACK_SIZE-FM_SIZE        ; Check if we are on debug stack
+                       blt+    cr2,kernelStackNotBad                   ; Yeah, that is ok too...
+
+                       lis             r0,hi16(Choke)                                  ; Choke code
+                       ori             r0,r0,lo16(Choke)                               ; and the rest
+                       li              r3,failStack                                    ; Bad stack code
+                       sc                                                                              ; System ABEND
+
+kernelStackUnaligned:
+                       lis             r0,hi16(Choke)                                  ; Choke code
+                       ori             r0,r0,lo16(Choke)                               ; and the rest
+                       li              r3,failUnalignedStk                             ; Unaligned stack code
+                       sc                                                                              ; System ABEND

 
 
 /*
 
 
 /*


@@ -290,134 +293,140 @@ thread_return:
  *             PPC-only "fast" traps are in the range 0x7xxx
  */
  
  *             PPC-only "fast" traps are in the range 0x7xxx
  */
  

-ENTRY(shandler, TAG_NO_FRAME_USED)
-
-                       mfsprg  r25,0                                           /* Get the per proc area */
-                       lwz             r0,saver0(r4)                           /* Get the original syscall number */
-                       lwz             r17,PP_ISTACKPTR(r25)           ; Get interrupt stack pointer
-                       rlwinm  r15,r0,0,0,19                           ; Clear the bottom of call number for fast check
-                       lwz             r16,PP_CPU_DATA(r25)            /* Assume we need this */
-                       mr.             r17,r17                                         ; Are we on interrupt stack?
-                       lwz             r7,savesrr1(r4)                         ; Get the SRR1 value
-                       beq-    EXT(ihandler)                           ; On interrupt stack, not allowed...
+                       .align  5
+                       .globl EXT(shandler)
+LEXT(shandler)                                                                         ; System call handler
+
+                       lwz             r7,savesrr1+4(r4)                               ; Get the SRR1 value
+                       mfsprg  r13,1                                                   ; Get the current activation
+                       lwz             r25,ACT_PER_PROC(r13)                   ; Get the per_proc block 
+                       lwz             r0,saver0+4(r4)                                 ; Get the original syscall number
+                       lwz             r17,PP_ISTACKPTR(r25)                   ; Get interrupt stack pointer
+                       rlwinm  r15,r0,0,0,19                                   ; Clear the bottom of call number for fast check
+                       mr.             r17,r17                                                 ; Are we on interrupt stack?
+                       lwz             r9,savevrsave(r4)                               ; Get the VRsave register
+                       beq--   EXT(ihandler)                                   ; On interrupt stack, not allowed...

                        rlwinm. r6,r7,0,MSR_VEC_BIT,MSR_VEC_BIT ; Was vector on?
                        rlwinm. r6,r7,0,MSR_VEC_BIT,MSR_VEC_BIT ; Was vector on?

-                       lwz             r16,CPU_ACTIVE_THREAD(r16)      /* Get the thread pointer */
-
-                       beq+    svecoff                                         ; Vector off, do not save vrsave...
-                       lwz             r7,savevrsave(r4)                       ; Get the VRSAVE register
-                       stw             r7,liveVRS(r25)                         ; Set the live value
-
-svecoff:       rlwinm. r6,r7,0,MSR_FP_BIT,MSR_FP_BIT   ; Was floating point on?
-                       lwz             r13,THREAD_TOP_ACT(r16)         /* Pick up the active thread */
-                       beq+    sfpoff                                          ; Skip if floating point is off...
-                       lwz             r9,savexfpscr(r4)                       ; Grab the just saved FPSCR
-                       stw             r9,liveFPSCR(r25)                       ; Make it the live copy
+                       mr              r16,r13

 
 

+                       beq++   svecoff                                                 ; Vector off, do not save vrsave...
+                       stw             r9,liveVRS(r25)                                 ; Set the live value
+;

 ;                      Check if SCs are being redirected for the BlueBox or to VMM
 ;                      Check if SCs are being redirected for the BlueBox or to VMM

+;

 
 

-sfpoff:                lwz             r6,ACT_MACT_SPF(r13)            ; Pick up activation special flags
-                       lwz             r26,ACT_MACT_BEDA(r13)          ; Pick up the pointer to the blue box exception area
-                       rlwinm. r9,r6,0,runningVMbit,runningVMbit       ; Are we running in alternate context right now?                
-                       cmpwi   cr1,r26,0                                       ; Do we have Blue Box Assist active?
-                       crmove  cr2_eq,cr0_eq                           ; Remember if we are in VMM
-                       rlwinm. r6,r6,0,bbNoMachSCbit,bbNoMachSCbit ; Are mach SCs redirected for this thread
-                       beq+    noassist                                        ; Take branch if SCs are not redirected
-                       beq-    cr1,noassist                            ; No assist for non-bluebox threads
-                       mr              r9,r13                                          ; Setup ACT for atomic_switch api       
-                       b               EXT(atomic_switch_syscall)      ; Go to the assist...
-
-noassist:
-                       cmplwi  r15,0x7000                                      /* Do we have a fast path trap? */
-                       lwz             r14,ACT_MACT_PCB(r13)           /* Now point to the PCB */
-                       beql+   fastpath                                        /* We think it's a fastpath... */
-
-                       lwz             r1,ACT_MACT_KSP(r13)            /* Get the kernel stack pointer */
+svecoff:       lwz             r6,ACT_MACT_SPF(r13)                    ; Pick up activation special flags
+                       mtcrf   0x40,r6                                                 ; Check special flags
+                       mtcrf   0x01,r6                                                 ; Check special flags
+                       crmove  cr6_eq,runningVMbit                             ; Remember if we are in VMM
+                       bne++   cr6,sVMchecked                                  ; Not running VM
+                       lwz             r18,spcFlags(r25)                               ; Load per_proc special flags
+                       rlwinm. r18,r18,0,FamVMmodebit,FamVMmodebit     ; Is FamVMmodebit set?
+                       beq             sVMchecked                                              ; Not in FAM
+                       cmpwi   r0,0x6004                                               ; Is it vmm_dispatch syscall:
+                       bne             sVMchecked
+                       lwz             r26,saver3+4(r4)                                ; Get the original syscall number
+                       cmpwi   cr6,r26,kvmmExitToHost                  ; vmm_exit_to_host request
+sVMchecked:
+                       bf++    bbNoMachSCbit,noassist                  ; Take branch if SCs are not redirected
+                       lwz             r26,ACT_MACT_BEDA(r13)                  ; Pick up the pointer to the blue box exception area
+                       b               EXT(atomic_switch_syscall)              ; Go to the assist...
+
+noassist:      cmplwi  r15,0x7000                                              ; Do we have a fast path trap? 
+                       lwz             r14,ACT_MACT_PCB(r13)                   ; Now point to the PCB 
+                       beql    fastpath                                                ; We think it is a fastpath... 
+
+                       lwz             r1,ACT_MACT_KSP(r13)                    ; Get the kernel stack pointer 

 #if DEBUG
 #if DEBUG

-                       mr.             r1,r1                                           /* Are we already on the kernel stack? */
-                       li              r3,T_SYSTEM_CALL                        /* Yup, pretend we had an interrupt... */
-                       beq-    EXT(ihandler)                           /* Bad boy, bad boy... What'cha gonna do when they come for you? */
+                       mr.             r1,r1                                                   ; Are we already on the kernel stack? 
+                       li              r3,T_SYSTEM_CALL                                ; Yup, pretend we had an interrupt... 
+                       beq-    EXT(ihandler)                                   ; Bad boy, bad boy... What cha gonna do when they come for you?

 #endif /* DEBUG */
 
 #endif /* DEBUG */
 

-                       stw             r4,ACT_MACT_PCB(r13)            /* Point to our savearea */
-                       li              r0,0                                            /* Clear this out */
-                       stw             r14,SAVprev(r4)                         /* Queue the new save area in the front */
-                       stw             r13,SAVact(r4)                          /* Point the savearea at its activation */
+                       stw             r4,ACT_MACT_PCB(r13)                    ; Point to our savearea
+                       stw             r4,ACT_MACT_UPCB(r13)                   ; Store user savearea
+                       li              r0,0                                                    ; Clear this out 
+                       stw             r14,SAVprev+4(r4)                               ; Queue the new save area in the front 
+                       stw             r13,SAVact(r4)                                  ; Point the savearea at its activation

                        
 #if VERIFYSAVE
                        
 #if VERIFYSAVE

-                       bl              versave                                         ; (TEST/DEBUG)
+                       bl              versave                                                 ; (TEST/DEBUG)

 #endif                 
                        
 #endif                 
                        

-                       mr              r30,r4                                          /* Save pointer to the new context savearea */
-                       lwz             r15,saver1(r4)                          /* Grab interrupt time stack */
-                       stw             r0,ACT_MACT_KSP(r13)            /* Mark stack as busy with 0 val */
-                       stw             r15,FM_BACKPTR(r1)                      /* Link backwards */
+                       lwz             r15,saver1+4(r4)                                ; Grab interrupt time stack 
+                       mr              r30,r4                                                  ; Save pointer to the new context savearea
+                       stw             r0,ACT_MACT_KSP(r13)                    ; Mark stack as busy with 0 val 
+                       stw             r15,FM_BACKPTR(r1)                              ; Link stack frame backwards
+
+                       lwz             r3,SAVtime+4(r30)
+                       addi    r4,r13,SYSTEM_TIMER
+                       bl              EXT(timer_event)

                
 #if    DEBUG
                
 #if    DEBUG

-       /* If debugging, we need two frames, the first being a dummy
-        * which links back to the trapped routine. The second is
-        * that which the C routine below will need
-        */
-                       lwz             r8,savesrr0(r30)                        /* Get the point of interruption */
-                       stw             r8,FM_LR_SAVE(r1)                       /* save old instr ptr as LR value */
-                       stwu    r1,     -FM_SIZE(r1)                    /* and make new frame */
+/* If debugging, we need two frames, the first being a dummy
+ * which links back to the trapped routine. The second is
+ * that which the C routine below will need
+ */
+                       lwz             r8,savesrr0+4(r30)                              ; Get the point of interruption
+                       stw             r8,FM_LR_SAVE(r1)                               ; Save old instr ptr as LR value
+                       stwu    r1,     -FM_SIZE(r1)                            ; and make new frame

 #endif /* DEBUG */
 
 #endif /* DEBUG */
 

-                       mfmsr   r11                                                     /* Get the MSR */
-                       lwz             r15,SAVflags(r4)                        /* Get the savearea flags */
-                       ori             r11,r11,lo16(MASK(MSR_EE))      /* Turn on interruption enabled bit */
-                       lwz             r0,saver0(r30)                          ; Get R0 back
-                       oris    r15,r15,SAVsyscall >> 16        /* Mark that it this is a syscall */
-                       rlwinm  r10,r0,0,0,19                           ; Keep only the top part 
-                       stwu    r1,-(FM_SIZE+ARG_SIZE)(r1)      /* Make a stack frame */
-                       cmplwi  r10,0x6000                                      ; Is it the special ppc-only guy?
-                       stw             r15,SAVflags(r30)                       /* Save syscall marker */
-                       bne-    cr2,exitFromVM                          ; It is time to exit from alternate context...
-                       
-                       beq-    ppcscall                                        ; Call the ppc-only system call handler...
-
-                       mtmsr   r11                                                     /* Enable interruptions */
-
-                       /* Call a function that can print out our syscall info */
-                       /* Note that we don't care about any volatiles yet */

                        mr              r4,r30
                        mr              r4,r30

-                       bl              EXT(syscall_trace)      
-       
-                       lwz             r0,saver0(r30)                          /* Get the system call selector */
-                       mr.             r0,r0                                           /* What kind is it? */
-                       blt-    .L_kernel_syscall                       /* -ve syscall - go to kernel */
-                                                                                               /* +ve syscall - go to server */
-                       cmpwi   cr0,r0,0x7FFA
-                       beq-    .L_notify_interrupt_syscall
-                       
-#ifdef MACH_BSD
-                       mr              r3,r30                                          /* Get PCB/savearea */
-                       lwz             r4,saver4(r30)                          /* Restore r4 */
-                       lwz             r5,saver5(r30)                          /* Restore r5 */
-                       lwz             r6,saver6(r30)                          /* Restore r6 */
-                       lwz             r7,saver7(r30)                          /* Restore r7 */
-                       lwz             r8,saver8(r30)                          /* Restore r8 */
-                       lwz             r9,saver9(r30)                          /* Restore r9 */
-                       lwz             r10,saver10(r30)                        /* Restore r10 */
-                       bl              EXT(unix_syscall)                       /* Check out unix... */
+
+                       lwz             r15,SAVflags(r30)                               ; Get the savearea flags
+                       lwz             r0,saver0+4(r30)                                ; Get R0 back
+                       mfmsr   r11                                                             ; Get the MSR
+                       stwu    r1,-(FM_SIZE+ARG_SIZE+MUNGE_ARGS_SIZE)(r1)              ; Make a stack frame
+                       ori             r11,r11,lo16(MASK(MSR_EE))              ; Turn on interruption enabled bit
+                       rlwinm  r10,r0,0,0,19                                   ; Keep only the top part 
+                       oris    r15,r15,SAVsyscall >> 16                ; Mark that it this is a syscall
+                       cmplwi  r10,0x6000                                              ; Is it the special ppc-only guy?
+                       stw             r15,SAVflags(r30)                               ; Save syscall marker
+                       beq--   cr6,exitFromVM                                  ; It is time to exit from alternate context...
+                       
+                       beq--   ppcscall                                                ; Call the ppc-only system call handler...
+
+                       mr.             r0,r0                                                   ; What kind is it?
+                       mtmsr   r11                                                             ; Enable interruptions
+
+                       blt--   .L_kernel_syscall                               ; System call number if negative, this is a mach call...
+                                                                                       
+                       lwz     r8,ACT_TASK(r13)                                ; Get our task
+                       cmpwi   cr0,r0,0x7FFA                                   ; Special blue box call?
+                       beq--   .L_notify_interrupt_syscall             ; Yeah, call it...
+                       
+                       lwz     r7,TASK_SYSCALLS_UNIX(r8)               ; Get the current count
+                       mr      r3,r30                                                  ; Get PCB/savearea
+                       mr      r4,r13                                                  ; current activation
+                       addi    r7,r7,1                                                 ; Bump it
+                       stw     r7,TASK_SYSCALLS_UNIX(r8)               ; Save it
+
+#if FPFLOOD
+                       stfd    f31,emfp31(r25)                                 ; (TEST/DEBUG)

 #endif
 
 #endif
 

+                       bl      EXT(unix_syscall)                               ; Check out unix...
+

 .L_call_server_syscall_exception:              
 .L_call_server_syscall_exception:              

-                       li              r3,EXC_SYSCALL                          /* doexception(EXC_SYSCALL, num, 1) */
+                       li              r3,EXC_SYSCALL                                  ; doexception(EXC_SYSCALL, num, 1)

 
 .L_call_server_exception:
 
 .L_call_server_exception:

-                       mr              r4,r0                                           /* Set syscall selector */
+                       mr              r4,r0                                                   ; Set syscall selector

                        li              r5,1
                        li              r5,1

-                       b               EXT(doexception)                        /* Go away, never to return... */
-
-/* The above, but with EXC_MACH_SYSCALL */
-.L_call_server_mach_syscall:
-                       li              r3,EXC_MACH_SYSCALL
-                       b               .L_call_server_exception        /* Join the common above... */
+                       b               EXT(doexception)                                ; Go away, never to return...

 
 .L_notify_interrupt_syscall:
 
 .L_notify_interrupt_syscall:

-                       lwz             r3,saver3(r30)                          ; Get the new PC address to pass in
+                       lwz             r3,saver3+4(r30)                                ; Get the new PC address to pass in

                        bl              EXT(syscall_notify_interrupt)
                        bl              EXT(syscall_notify_interrupt)

-                       b               .L_syscall_return
+/*
+ * Ok, return from C function, R3 = return value
+ *
+ * saved state is still in R30 and the active thread is in R16 .       
+ */
+                       mr              r31,r16                                                 ; Move the current thread pointer
+                       stw             r3,saver3+4(r30)                                ; Stash the return code
+                       b               .L_thread_syscall_ret_check_ast

        
 ;
 ;                      Handle PPC-only system call interface
        
 ;
 ;                      Handle PPC-only system call interface


@@ -425,7 +434,7 @@ noassist:
 ;                      and the savearea/pcb as the first parameter.
 ;                      It is up to the callee to enable interruptions if
 ;                      they should be.  We are in a state here where
 ;                      and the savearea/pcb as the first parameter.
 ;                      It is up to the callee to enable interruptions if
 ;                      they should be.  We are in a state here where

-;                      both interrupts and preemption is ok, but because we could
+;                      both interrupts and preemption are ok, but because we could

 ;                      be calling diagnostic code we will not enable.
 ;                      
 ;                      Also, the callee is responsible for finding any parameters
 ;                      be calling diagnostic code we will not enable.
 ;                      
 ;                      Also, the callee is responsible for finding any parameters


@@ -440,13 +449,17 @@ noassist:
 ;                      Note: the last option is intended for special diagnostics calls that 
 ;                      want the thread to return and execute before checking for preemption.
 ;
 ;                      Note: the last option is intended for special diagnostics calls that 
 ;                      want the thread to return and execute before checking for preemption.
 ;

+;                      NOTE: Both R16 (thread) and R30 (savearea) need to be preserved over this call!!!!
+;
+
+                       .align  5

 
 

-ppcscall:      rlwinm  r11,r0,2,18,29                          ; Make an index into the table
-                       lis             r10,hi16(EXT(PPCcalls))         ; Get PPC-only system call table
-                       cmplwi  r11,PPCcallmax                          ; See if we are too big
-                       ori             r10,r10,lo16(EXT(PPCcalls))     ; Merge in low half
+ppcscall:      rlwinm  r11,r0,2,18,29                                  ; Make an index into the table
+                       lis             r10,hi16(EXT(PPCcalls))                 ; Get PPC-only system call table
+                       cmplwi  r11,PPCcallmax                                  ; See if we are too big
+                       ori             r10,r10,lo16(EXT(PPCcalls))             ; Merge in low half

                        bgt-    .L_call_server_syscall_exception        ; Bogus call...
                        bgt-    .L_call_server_syscall_exception        ; Bogus call...

-                       lwzx    r11,r10,r11                                     ; Get function address
+                       lwzx    r11,r10,r11                                             ; Get function address

                        
 ;
 ;                      Note: make sure we do not change the savearea in R30 to
                        
 ;
 ;                      Note: make sure we do not change the savearea in R30 to


@@ -454,24 +467,77 @@ ppcscall: rlwinm  r11,r0,2,18,29                          ; Make an index into the table
 ;                      depend upon it being there.
 ;
        
 ;                      depend upon it being there.
 ;
        

-                       mr              r3,r30                                          ; Pass the savearea
-                       mr              r4,r13                                          ; Pass the activation
-                       mr.             r11,r11                                         ; See if there is a function here
-                       mtlr    r11                                                     ; Set the function address
+                       mr              r3,r30                                                  ; Pass the savearea
+                       mr              r4,r13                                                  ; Pass the activation
+                       mr.             r11,r11                                                 ; See if there is a function here
+                       mtctr   r11                                                             ; Set the function address

                        beq-    .L_call_server_syscall_exception        ; Disabled call...
                        beq-    .L_call_server_syscall_exception        ; Disabled call...

-                       blrl                                                            ; Call it
-
-               
+#if INSTRUMENT
+                       mfspr   r4,pmc1                                                 ; Get stamp
+                       stw             r4,0x6100+(9*16)+0x0(0)                 ; Save it
+                       mfspr   r4,pmc2                                                 ; Get stamp
+                       stw             r4,0x6100+(9*16)+0x4(0)                 ; Save it
+                       mfspr   r4,pmc3                                                 ; Get stamp
+                       stw             r4,0x6100+(9*16)+0x8(0)                 ; Save it
+                       mfspr   r4,pmc4                                                 ; Get stamp
+                       stw             r4,0x6100+(9*16)+0xC(0)                 ; Save it
+#endif
+                       bctrl                                                                   ; Call it
+       

                        .globl  EXT(ppcscret)
                        .globl  EXT(ppcscret)

+

 LEXT(ppcscret)
 LEXT(ppcscret)

-                       mr.             r3,r3                                           ; See what we should do
-                       mr              r31,r16                                         ; Restore the current thread pointer
+                       mr.             r3,r3                                                   ; See what we should do
+                       mr              r31,r16                                                 ; Restore the current thread pointer

                        bgt+    .L_thread_syscall_ret_check_ast ; Take normal AST checking return....
                        bgt+    .L_thread_syscall_ret_check_ast ; Take normal AST checking return....

-                       blt+    .L_thread_syscall_return        ; Return, but no ASTs....
-                       lwz             r0,saver0(r30)                          ; Restore the system call number
+                       mfsprg  r10,1                                                   ; Get the current activation
+                       lwz             r10,ACT_PER_PROC(r10)                   ; Get the per_proc block 
+                       blt+    .L_thread_syscall_return                ; Return, but no ASTs....
+                       lwz             r0,saver0+4(r30)                                ; Restore the system call number

                        b               .L_call_server_syscall_exception        ; Go to common exit...
 
 
                        b               .L_call_server_syscall_exception        ; Go to common exit...
 
 

+
+/*
+ * we get here for mach system calls
+ * when kdebug tracing is enabled
+ */
+       
+ksystrace:     
+                       mr              r4,r30                                                  ; Pass in saved state
+                       bl      EXT(syscall_trace)
+                       
+                       cmplw   r31,r29                                                 ; Is this syscall in the table? 
+                       add             r31,r27,r28                                             ; Point right to the syscall table entry
+
+                       bge-    .L_call_server_syscall_exception        ; The syscall number is invalid
+       
+                       lwz     r0,savesrr1(r30)                                ; Get the saved srr1
+                       rlwinm. r0,r0,0,MSR_SF_BIT,MSR_SF_BIT   ; Test for 64 bit caller
+                       lwz             r0,MACH_TRAP_ARG_MUNGE32(r31)   ; Pick up the 32 bit munge function address
+                       beq--   .L_ksystrace_munge
+                       lwz             r0,MACH_TRAP_ARG_MUNGE64(r31)   ; Pick up the 64 bit munge function address
+
+.L_ksystrace_munge:
+                       cmplwi  r0,0                                                    ; do we have a munger to call?
+                       mtctr   r0                                                              ; Set the function call address
+                       addi    r3,r30,saver3                                   ; Pointer to args from save area
+                       addi    r4,r1,FM_ARG0+ARG_SIZE                  ; Pointer for munged args
+                       beq--   .L_ksystrace_trapcall                   ; just make the trap call
+                       bctrl                                                                   ; Call the munge function
+
+.L_ksystrace_trapcall:         
+                       lwz             r0,MACH_TRAP_FUNCTION(r31)              ; Pick up the function address
+                       mtctr   r0                                                              ; Set the function call address
+                       addi    r3,r1,FM_ARG0+ARG_SIZE                  ; Pointer to munged args
+                       bctrl
+
+                       mr              r4,r30                                                  ; Pass in the savearea
+                       bl              EXT(syscall_trace_end)                  ; Trace the exit of the system call     
+                       b               .L_mach_return
+
+       
+                       

 /* Once here, we know that the syscall was -ve
  * we should still have r1=ksp,
  * r16         = pointer to current thread,
 /* Once here, we know that the syscall was -ve
  * we should still have r1=ksp,
  * r16         = pointer to current thread,


@@ -479,224 +545,108 @@ LEXT(ppcscret)
  * r0          = syscall number
  * r30         = pointer to saved state (in pcb)
  */
  * r0          = syscall number
  * r30         = pointer to saved state (in pcb)
  */

-.L_kernel_syscall:     
-                       neg     r31,    r0              /* Make number +ve and put in r31*/
-
-       /* If out of range, call server with syscall exception */
-       addis   r29,    0,      HIGH_CADDR(EXT(mach_trap_count))
-       addi    r29,    r29,    LOW_ADDR(EXT(mach_trap_count))
-       lwz     r29,    0(r29)
-
-       cmp     cr0,    r31,    r29
-       bge-    cr0,    .L_call_server_syscall_exception
-
-       addis   r29,    0,      HIGH_CADDR(EXT(mach_trap_table))
-       addi    r29,    r29,    LOW_ADDR(EXT(mach_trap_table))
-       
-       /* multiply the trap number to get offset into table */
-       slwi    r31,    r31,    MACH_TRAP_OFFSET_POW2
-
-       /* r31 now holds offset into table of our trap entry,
-        * add on the table base, and it then holds pointer to entry
-        */
-       add     r31,    r31,    r29
-
-       /* If the function is kern_invalid, prepare to send an exception.
-          This is messy, but parallels the x86.  We need it for task_by_pid,
-          at least.  */
-       lis     r29,    HIGH_CADDR(EXT(kern_invalid))
-       addi    r29,    r29,    LOW_ADDR(EXT(kern_invalid))
-       lwz     r0,     MACH_TRAP_FUNCTION(r31)
-       cmp     cr0,    r0,     r29
-       beq-    .L_call_server_syscall_exception
-
-       /* get arg count. If argc > 8 then not all args were in regs,
-        * so we must perform copyin.
-        */
-       lwz     r29,    MACH_TRAP_ARGC(r31)
-       cmpwi   cr0,    r29,    8
-       ble+    .L_syscall_got_args
-
-/* argc > 8  - perform a copyin */
-/* if the syscall came from kernel space, we can just copy */
-
-                       lwz             r0,savesrr1(r30)                                /* Pick up exception time MSR */
-                       andi.   r0,r0,MASK(MSR_PR)                              /* Check the priv bit */
-                       bne+    .L_syscall_arg_copyin                   /* We're not priviliged... */
-
-/* we came from a privilaged task, just do a copy */
-/* get user's stack pointer */
-
-                       lwz             r28,saver1(r30)                                 /* Get the stack pointer */
-
-                       subi    r29,r29,8                                               /* Get the number of arguments to copy */
-
-                       addi    r28,r28,COPYIN_ARG0_OFFSET-4    /* Point to source - 4 */
-                       addi    r27,r1,FM_ARG0-4                                /* Point to sink - 4 */
-
-.L_syscall_copy_word_loop:
-                       addic.  r29,r29,-1                                              /* Count down the number of arguments left */
-                       lwz             r0,4(r28)                                               /* Pick up the argument from the stack */
-                       addi    r28,r28,4                                               /* Point to the next source */
-                       stw             r0,4(r27)                                               /* Store the argument */
-                       addi    r27,r27,4                                               /* Point to the next sink */
-                       bne+    .L_syscall_copy_word_loop               /* Move all arguments... */
-                       b               .L_syscall_got_args                             /* Go call it now... */
-
-
-/* we came from a user task, pay the price of a real copyin */ 
-/* set recovery point */
-
-.L_syscall_arg_copyin:
-                       lwz             r8,ACT_VMMAP(r13)                               ; Get the vm_map for this activation
-                       lis             r28,hi16(.L_syscall_copyin_recover)
-                       lwz             r8,VMMAP_PMAP(r8)                               ; Get the pmap
-                       ori             r28,r28,lo16(.L_syscall_copyin_recover)
-                       addi    r8,r8,PMAP_SEGS                                 ; Point to the pmap SR slots
-                       stw             r28,THREAD_RECOVER(r16)                 /* R16 still holds thread ptr */
-
-/* We can manipulate the COPYIN segment register quite easily
- * here, but we've also got to make sure we don't go over a
- * segment boundary - hence some mess.
- * Registers from 12-29 are free for our use.
- */
-       

 
 

-                       lwz             r28,saver1(r30)                                 /* Get the stack pointer */
-                       subi    r29,r29,8                                               /* Get the number of arguments to copy */
-                       addi    r28,r28,COPYIN_ARG0_OFFSET      /* Set source in user land */
-
-/* set up SR_COPYIN to allow us to copy, we may need to loop
- * around if we change segments. We know that this previously
- * pointed to user space, so the sid doesn't need setting.
- */
-
-                       rlwinm  r7,r28,6,26,29                                  ; Get index to the segment slot
-
-.L_syscall_copyin_seg_loop:
-                       
-                       
-                       lwzx    r10,r8,r7                                               ; Get the source SR value
-                       rlwinm  r26,r28,0,4,31                                  ; Clear the segment number from source address
-                       mtsr    SR_COPYIN,r10                                   ; Set the copyin SR
-                       isync
+                               .align  5

 
 

-                       oris    r26,r26,(SR_COPYIN_NUM << (28-16))      ; Insert the copyin segment number into source address
-       
-/* Make r27 point to address-4 of where we will store copied args */
-                       addi    r27,r1,FM_ARG0-4
-       
-.L_syscall_copyin_word_loop:
-                       
-                       lwz             r0,0(r26)                                               /* MAY CAUSE PAGE FAULT! */
-                       subi    r29,r29,1                                               ; Decrement count
-                       addi    r26,r26,4                                               ; Bump input
-                       stw             r0,4(r27)                                               ; Save the copied in word
-                       mr.             r29,r29                                                 ; Are they all moved?
-                       addi    r27,r27,4                                               ; Bump output
-                       beq+    .L_syscall_copyin_done                  ; Escape if we are done...
-       
-                       rlwinm. r0,r26,0,4,29                                   ; Did we just step into a new segment?          
-                       addi    r28,r28,4                                               ; Bump up user state address also
-                       bne+    .L_syscall_copyin_word_loop             ; We are still on the same segment...
-
-                       addi    r7,r7,4                                                 ; Bump to next slot
-                       b               .L_syscall_copyin_seg_loop              /* On new segment! remap */
-
-/* Don't bother restoring SR_COPYIN, we can leave it trashed */
-/* clear thread recovery as we're done touching user data */
-
-.L_syscall_copyin_done:        
-                       li              r0,0
-                       stw             r0,THREAD_RECOVER(r16) /* R16 still holds thread ptr */
-
-.L_syscall_got_args:
-                       lwz             r8,ACT_TASK(r13)                /* Get our task */
-                       lis             r10,hi16(EXT(c_syscalls_mach))  /* Get top half of counter address */
-                       lwz             r7,TASK_SYSCALLS_MACH(r8)               ; Get the current count
-                       lwz             r3,saver3(r30)                  /* Restore r3 */
-                       addi    r7,r7,1                                 ; Bump it
-                       ori             r10,r10,lo16(EXT(c_syscalls_mach)) /* Get low half of counter address */
-                       stw             r7,TASK_SYSCALLS_MACH(r8)               ; Save it
-                       lwz             r4,saver4(r30)                  /* Restore r4 */
-                       lwz             r9,0(r10)                               /* Get counter */       
-                       lwz             r5,saver5(r30)                  /* Restore r5 */
-                       lwz             r6,saver6(r30)                  /* Restore r6 */
-                       addi    r9,r9,1                                 /* Add 1 */
-                       lwz             r7,saver7(r30)                  /* Restore r7 */
-                       lwz             r8,saver8(r30)                  /* Restore r8 */
-                       stw             r9,0(r10)                               /* Save it back */
-                       lwz             r9,saver9(r30)                  /* Restore r9 */
-                       lwz             r10,saver10(r30)                /* Restore r10 */
-
-                       lwz             r0,MACH_TRAP_FUNCTION(r31)
-
-/* calling this function, all the callee-saved registers are
- * still valid except for r30 and r31 which are in the PCB
- * r30 holds pointer to saved state (ie. pcb)
- * r31 is scrap
- */
-                       mtctr   r0
-                       bctrl                                                   /* perform the actual syscall */
+.L_kernel_syscall:     
+;
+; Call a function that can print out our syscall info 
+; Note that we don t care about any volatiles yet
+;
+                       lwz             r10,ACT_TASK(r13)                               ; Get our task 
+                       lwz             r0,saver0+4(r30)
+                       lis             r8,hi16(EXT(kdebug_enable))             ; Get top of kdebug_enable 
+                       lis             r28,hi16(EXT(mach_trap_table))  ; Get address of table
+                       ori             r8,r8,lo16(EXT(kdebug_enable))  ; Get bottom of kdebug_enable 
+                       lwz             r8,0(r8)                                                ; Get kdebug_enable 
+
+                       lwz             r7,TASK_SYSCALLS_MACH(r10)              ; Get the current count
+                       neg             r31,r0                                                  ; Make this positive
+                       mr              r3,r31                                                  ; save it
+                       slwi    r27,r3,4                                                ; multiply by 16
+                       slwi    r3,r3,2                                                 ; and the original by 4
+                       ori             r28,r28,lo16(EXT(mach_trap_table))      ; Get address of table
+                       add             r27,r27,r3                                              ; for a total of 20x (5 words/entry)
+                       addi    r7,r7,1                                                 ; Bump TASK_SYSCALLS_MACH count
+                       cmplwi  r8,0                                                    ; Is kdebug_enable non-zero
+                       stw             r7,TASK_SYSCALLS_MACH(r10)              ; Save count
+                       bne--   ksystrace                                               ; yes, tracing enabled
+                       
+                       cmplwi  r31,MACH_TRAP_TABLE_COUNT               ; Is this syscall in the table? 
+                       add             r31,r27,r28                                             ; Point right to the syscall table entry
+
+                       bge--   .L_call_server_syscall_exception        ; The syscall number is invalid
+
+                       lwz     r0,savesrr1(r30)                                ; Get the saved srr1
+                       rlwinm. r0,r0,0,MSR_SF_BIT,MSR_SF_BIT   ; Test for 64 bit caller
+                       lwz             r0,MACH_TRAP_ARG_MUNGE32(r31)   ; Pick up the 32 bit munge function address
+                       beq--   .L_kernel_syscall_munge
+                       lwz             r0,MACH_TRAP_ARG_MUNGE64(r31)   ; Pick up the 64 bit munge function address
+
+.L_kernel_syscall_munge:
+                       cmplwi  r0,0                                                    ; test for null munger
+                       mtctr   r0                                                              ; Set the function call address
+                       addi    r3,r30,saver3                                   ; Pointer to args from save area
+                       addi    r4,r1,FM_ARG0+ARG_SIZE                  ; Pointer for munged args
+                       beq--   .L_kernel_syscall_trapcall              ; null munger - skip to trap call
+                       bctrl                                                                   ; Call the munge function
+
+.L_kernel_syscall_trapcall:            
+                       lwz             r0,MACH_TRAP_FUNCTION(r31)              ; Pick up the function address
+                       mtctr   r0                                                              ; Set the function call address
+                       addi    r3,r1,FM_ARG0+ARG_SIZE                  ; Pointer to munged args
+
+#if FPFLOOD
+                       stfd    f31,emfp31(r25)                                 ; (TEST/DEBUG)
+#endif

 
 

-/* 'standard' syscall returns here - INTERRUPTS ARE STILL ON */
+                       bctrl

 
 

-/* r3 contains value that we're going to return to the user
- */

 
 /*
 
 /*

- * Ok, return from C function, ARG0 = return value
+ * Ok, return from C function, R3 = return value

  *
  * get the active thread's PCB pointer and thus pointer to user state
  *
  * get the active thread's PCB pointer and thus pointer to user state

- * saved state is still in R30 and the active thread is in R16 .       
+ * saved state is still in R30 and the active thread is in R16

  */
 
  */
 

-/* Store return value into saved state structure, since
- * we need to pick up the value from here later - the
- * syscall may perform a thread_set_syscall_return
+.L_mach_return:
+                       srawi  r0,r3,31                                                 ; properly extend the return code
+                       cmpi    cr0,r3,KERN_INVALID_ARGUMENT    ; deal with invalid system calls
+                       mr              r31,r16                                                 ; Move the current thread pointer
+                       stw             r0, saver3(r30)                                 ; stash the high part of the return code
+                       stw             r3,saver3+4(r30)                                ; Stash the low part of the return code
+                       beq--   cr0,.L_mach_invalid_ret                 ; otherwise fall through into the normal return path
+.L_mach_invalid_arg:           
+
+
+/* 'standard' syscall returns here - INTERRUPTS ARE STILL ON
+ * the syscall may perform a thread_set_syscall_return

  * followed by a thread_exception_return, ending up
  * at thread_syscall_return below, with SS_R3 having
  * been set up already
  * followed by a thread_exception_return, ending up
  * at thread_syscall_return below, with SS_R3 having
  * been set up already

- */
-
-/* When we are here, r16 should point to the current thread,
+ *
+ * When we are here, r31 should point to the current thread,

  *                   r30 should point to the current pcb
  *                   r30 should point to the current pcb

+ *    r3 contains value that we're going to return to the user
+ *    which has already been stored back into the save area

  */
  */

-
-/* save off return value, we must load it
- * back anyway for thread_exception_return
- * TODO NMGS put in register?
- */
-.L_syscall_return:     
-                       mr              r31,r16                                                         /* Move the current thread pointer */
-                       stw             r3,saver3(r30)                                          /* Stash the return code */
-       
-                       /* Call a function that records the end of */
-                       /* the mach system call */
-                       mr              r4,r30
-                       bl              EXT(syscall_trace_end)  
-       
-#if 0
-                       lis             r0,HIGH_ADDR(CutTrace)                          /* (TEST/DEBUG) */
-                       mr              r4,r31                                                          /* (TEST/DEBUG) */
-                       oris    r0,r0,LOW_ADDR(CutTrace)                        /* (TEST/DEBUG) */
-                       mr              r5,r30                                                          /* (TEST/DEBUG) */
-                       sc                                                                                      /* (TEST/DEBUG) */
-#endif
-
+               

 .L_thread_syscall_ret_check_ast:       
 .L_thread_syscall_ret_check_ast:       

-                       mfmsr   r12                                                                     /* Get the current MSR */
-                       rlwinm  r12,r12,0,MSR_EE_BIT+1,MSR_EE_BIT-1     /* Turn off interruptions enable bit */
-                       mtmsr   r12                                                                     /* Turn interruptions off */
+                       lis             r10,hi16(MASK(MSR_VEC))                 ; Get the vector enable
+                       mfmsr   r12                                                             ; Get the current MSR 
+                       ori             r10,r10,lo16(MASK(MSR_FP)|MASK(MSR_EE)) ; Add in FP and EE
+                       andc    r12,r12,r10                                             ; Turn off VEC, FP, and EE
+                       mtmsr   r12                                                             ; Turn interruptions off

                        
                        

-                       mfsprg  r10,0                                                           /* Get the per_processor block */
+                       mfsprg  r10,1                                                   ; Get the current activation
+                       lwz             r10,ACT_PER_PROC(r10)                   ; Get the per_proc block 

 
 /* Check to see if there's an outstanding AST */
                
 
 /* Check to see if there's an outstanding AST */
                

-                       lwz             r4,PP_NEED_AST(r10)
-                       lwz             r4,0(r4)
-                       cmpi    cr0,r4, 0
-                       beq             cr0,.L_syscall_no_ast
+                       lwz             r4,PP_PENDING_AST(r10)
+                       cmpi    cr0,r4, 0                                               ; Any pending asts?
+                       beq++   cr0,.L_syscall_no_ast                   ; Nope...

 
 /* Yes there is, call ast_taken 
  * pretending that the user thread took an AST exception here,
 
 /* Yes there is, call ast_taken 
  * pretending that the user thread took an AST exception here,


@@ -705,21 +655,48 @@ LEXT(ppcscret)
 
 #if    DEBUG
 /* debug assert - make sure that we're not returning to kernel */
 
 #if    DEBUG
 /* debug assert - make sure that we're not returning to kernel */

-                       lwz             r3,savesrr1(r30)
+                       lwz             r3,savesrr1+4(r30)

                        andi.   r3,r3,MASK(MSR_PR)
                        andi.   r3,r3,MASK(MSR_PR)

-                       bne+    0f                                                                      /* returning to user level, check */
+                       bne++   scrnotkern                                              ; returning to user level, check 

                        
                        

-                       BREAKPOINT_TRAP
-0:             
+                       lis             r0,hi16(Choke)                                  ; Choke code
+                       ori             r0,r0,lo16(Choke)                               ; and the rest
+                       li              r3,failContext                                  ; Bad state code
+                       sc                                                                              ; System ABEND
+
+scrnotkern:            

 #endif /* DEBUG */
        
 #endif /* DEBUG */
        

-                       li      r3,     0
-                       li      r4,     AST_ALL
-                       li      r5,     1
-                       bl      EXT(ast_taken)
-                       
-                       b       .L_thread_syscall_ret_check_ast
+                       lis             r3,hi16(AST_ALL)                                ; Set ast flags
+                       li              r4,1                                                    ; Set interrupt allowed
+                       ori             r3,r3,lo16(AST_ALL)
+                       bl              EXT(ast_taken)                                  ; Process the pending ast
+                       b               .L_thread_syscall_ret_check_ast ; Go see if there was another...

 
 

+.L_mach_invalid_ret:   
+/*
+ * need to figure out why we got an KERN_INVALID_ARG
+ * if it was due to a non-existent system call
+ * then we want to throw an exception... otherwise
+ * we want to pass the error code back to the caller
+ */
+                       lwz             r0,saver0+4(r30)                                ; reload the original syscall number
+                       neg             r28,r0                                                  ; Make this positive
+                       mr              r4,r28                                                  ; save a copy
+                       slwi    r27,r4,4                                                ; multiply by 16
+                       slwi    r4,r4,2                                                 ; and another 4
+                       lis             r28,hi16(EXT(mach_trap_table))  ; Get address of table
+                       add             r27,r27,r4                                              ; for a total of 20x (5 words/entry)
+                       ori             r28,r28,lo16(EXT(mach_trap_table))      ; Get address of table
+                       add             r28,r27,r28                                             ; Point right to the syscall table entry
+                       lwz             r27,MACH_TRAP_FUNCTION(r28)             ; Pick up the function address
+                       lis             r28,hi16(EXT(kern_invalid))             ; Get high half of invalid syscall function
+                       ori             r28,r28,lo16(EXT(kern_invalid)) ; Get low half of invalid syscall function
+                       cmpw    cr0,r27,r28                                             ; Check if this is an invalid system call
+                       beq--   .L_call_server_syscall_exception        ; We have a bad system call
+                       b               .L_mach_invalid_arg             ; a system call returned KERN_INVALID_ARG
+               
+       

 /* thread_exception_return returns to here, almost all
  * registers intact. It expects a full context restore
  * of what it hasn't restored itself (ie. what we use).
 /* thread_exception_return returns to here, almost all
  * registers intact. It expects a full context restore
  * of what it hasn't restored itself (ie. what we use).


@@ -729,53 +706,23 @@ LEXT(ppcscret)
  *                   r30 points to the current pcb
  */
  
  *                   r30 points to the current pcb
  */
  

+                       .align  5
+ 

 .L_syscall_no_ast:
 .L_thread_syscall_return:
 
 .L_syscall_no_ast:
 .L_thread_syscall_return:
 

-                       mr              r3,r30                                          ; Get savearea to the correct register for common exit
-                       lwz             r8,THREAD_TOP_ACT(r31)          /* Now find the current activation */
-
-                       lwz             r11,SAVflags(r30)                       /* Get the flags */
-                       lwz             r5,THREAD_KERNEL_STACK(r31)     /* Get the base pointer to the stack */
-                       rlwinm  r11,r11,0,15,13                         /* Clear the syscall flag */
-                       lwz             r4,SAVprev(r30)                         ; Get the previous save area
-                       stw             r11,SAVflags(r30)                       /* Stick back the flags */
-                       addi    r5,r5,KERNEL_STACK_SIZE-FM_SIZE /* Reset to empty */
-                       stw             r4,ACT_MACT_PCB(r8)                     ; Save previous save area
-                       stw             r5,ACT_MACT_KSP(r8)                     /* Save the empty stack pointer */
-               
-                       b               chkfac                                          ; Go end it all...
-
-
-.L_syscall_copyin_recover:
+                       mr              r3,r30                                                  ; Get savearea to the correct register for common exit

 
 

-       /* This is the catcher for any data faults in the copyin
-        * of arguments from the user's stack.
-        * r30 still holds a pointer to the PCB
-        *
-        * call syscall_error(EXC_BAD_ACCESS, EXC_PPC_VM_PROT_READ, sp, ssp),
-        *
-        * we already had a frame so we can do this
-        */     
-       
-                       li              r3,EXC_BAD_ACCESS
-                       li              r4,EXC_PPC_VM_PROT_READ
-                       lwz             r5,saver1(r30)
-                       mr              r6,r30
-               
-                       bl              EXT(syscall_error)
-                       b               .L_syscall_return
-
-               
-/*
- * thread_bootstrap_return()
- *
- * NOTE: THIS IS GOING AWAY IN A FEW DAYS....
- *
- */
-
-ENTRY(thread_bootstrap_return, TAG_NO_FRAME_USED)
-                       b               .L_thread_exc_ret_check_ast             ; Do the same as thread_exception_return...
+                       lwz             r11,SAVflags(r30)                               ; Get the flags 
+                       lwz             r5,THREAD_KERNEL_STACK(r31)             ; Get the base pointer to the stack 
+                       lwz             r4,SAVprev+4(r30)                               ; Get the previous save area
+                       rlwinm  r11,r11,0,15,13                                 ; Clear the syscall flag
+                       mfsprg  r8,1                                                    ; Now find the current activation 
+                       addi    r5,r5,KERNEL_STACK_SIZE-FM_SIZE ; Reset to empty
+                       stw             r11,SAVflags(r30)                               ; Stick back the flags
+                       stw             r5,ACT_MACT_KSP(r8)                             ; Save the empty stack pointer
+                       stw             r4,ACT_MACT_PCB(r8)                             ; Save previous save area
+                       b               chkfac                                                  ; Go end it all...

 
 /*
  * thread_exception_return()
 
 /*
  * thread_exception_return()


@@ -783,13 +730,19 @@ ENTRY(thread_bootstrap_return, TAG_NO_FRAME_USED)
  * Return to user mode directly from within a system call.
  */
 
  * Return to user mode directly from within a system call.
  */
 

-ENTRY(thread_exception_return, TAG_NO_FRAME_USED)
+                       .align  5
+                       .globl EXT(thread_bootstrap_return)
+LEXT(thread_bootstrap_return)                                          ; NOTE: THIS IS GOING AWAY IN A FEW DAYS....

 
 

-.L_thread_exc_ret_check_ast:   
+                       .globl EXT(thread_exception_return)
+LEXT(thread_exception_return)                                          ; Directly return to user mode

 
 

-                       mfmsr   r3                                                      /* Get the MSR */
-                       rlwinm  r3,r3,0,MSR_EE_BIT+1,MSR_EE_BIT-1       /* Clear EE */
-                       mtmsr   r3                                                      /* Disable interrupts */
+.L_thread_exc_ret_check_ast:   
+                       lis             r10,hi16(MASK(MSR_VEC))                 ; Get the vector enable
+                       mfmsr   r3                                                              ; Get the MSR 
+                       ori             r10,r10,lo16(MASK(MSR_FP)|MASK(MSR_EE)) ; Add in FP and EE
+                       andc    r3,r3,r10                                               ; Turn off VEC, FP, and EE
+                       mtmsr   r3                                                              ; Disable interrupts

 
 /* Check to see if there's an outstanding AST */
 /* We don't bother establishing a call frame even though CHECK_AST
 
 /* Check to see if there's an outstanding AST */
 /* We don't bother establishing a call frame even though CHECK_AST


@@ -797,81 +750,89 @@ ENTRY(thread_exception_return, TAG_NO_FRAME_USED)
    frame, given that we're not going to return.  
 */
                
    frame, given that we're not going to return.  
 */
                

-                       mfsprg  r10,0                                           /* Get the per_processor block */
-                       lwz             r4,PP_NEED_AST(r10)
-                       lwz             r4,0(r4)
+                       mfsprg  r10,1                                                   ; Get the current activation
+                       lwz             r10,ACT_PER_PROC(r10)                   ; Get the per_proc block 
+                       lwz             r4,PP_PENDING_AST(r10)

                        cmpi    cr0,r4, 0
                        cmpi    cr0,r4, 0

-                       beq             cr0,.L_exc_ret_no_ast
+                       beq+            cr0,.L_exc_ret_no_ast

                
                

-       /* Yes there is, call ast_taken 
-        * pretending that the user thread took an AST exception here,
-        * ast_taken will save all state and bring us back here
-        */
+/* Yes there is, call ast_taken 
+ * pretending that the user thread took an AST exception here,
+ * ast_taken will save all state and bring us back here
+ */

        
        

-
-                       li              r3,0
-                       li              r4,AST_ALL
-                       li              r5,1
+                       lis             r3,hi16(AST_ALL)
+                       li              r4,1
+                       ori             r3,r3,lo16(AST_ALL)

                        
                        bl              EXT(ast_taken)
                        
                        bl              EXT(ast_taken)

-                       b               .L_thread_exc_ret_check_ast     /* check for a second AST (rare)*/
+                       b               .L_thread_exc_ret_check_ast             ; check for a second AST (rare)

        
 /* arriving here, interrupts should be disabled */
 /* Get the active thread's PCB pointer to restore regs
  */
 .L_exc_ret_no_ast:
                        
        
 /* arriving here, interrupts should be disabled */
 /* Get the active thread's PCB pointer to restore regs
  */
 .L_exc_ret_no_ast:
                        

-                       lwz             r31,PP_CPU_DATA(r10)
-                       lwz             r31,CPU_ACTIVE_THREAD(r31)
-                       lwz             r30,THREAD_TOP_ACT(r31)
+                       mfsprg  r30,1                                                   ; Get the currrent activation
+                       mr              r31,r30
+

                        lwz             r30,ACT_MACT_PCB(r30)
                        lwz             r30,ACT_MACT_PCB(r30)

-                       mr.             r30,r30                                                         ; Is there any context yet?
-                       beq-    makeDummyCtx                                            ; No, hack one up...
+                       mr.             r30,r30                                                 ; Is there any context yet?
+                       beq-    makeDummyCtx                                    ; No, hack one up...

 #if    DEBUG
 /* 
  * debug assert - make sure that we're not returning to kernel
  * get the active thread's PCB pointer and thus pointer to user state
  */
                
 #if    DEBUG
 /* 
  * debug assert - make sure that we're not returning to kernel
  * get the active thread's PCB pointer and thus pointer to user state
  */
                

-                       lwz             r3,savesrr1(r30)
+                       lwz             r3,savesrr1+4(r30)

                        andi.   r3,r3,MASK(MSR_PR)
                        andi.   r3,r3,MASK(MSR_PR)

-                       bne+    ret_user2                                                       ; We are ok...
+                       bne+    ret_user2                                               ; We are ok...

 
 

-                       BREAKPOINT_TRAP
+                       lis             r0,hi16(Choke)                                  ; Choke code
+                       ori             r0,r0,lo16(Choke)                               ; and the rest
+                       li              r3,failContext                                  ; Bad state code
+                       sc                                                                              ; System ABEND
+                       

 ret_user2:             
 #endif /* DEBUG */
                
 ret_user2:             
 #endif /* DEBUG */
                

-/* If the MSR_SYSCALL_MASK isn't set, then we came from a trap,
+/* If the system call flag isn't set, then we came from a trap,

  * so warp into the return_from_trap (thread_return) routine,
  * which takes PCB pointer in R3, not in r30!
  */
  * so warp into the return_from_trap (thread_return) routine,
  * which takes PCB pointer in R3, not in r30!
  */

-                       lwz             r0,SAVflags(r30)
-                       mr              r3,r30                                                          /* Copy pcb pointer into r3 in case */
-                       andis.  r0,r0,SAVsyscall>>16                            /* Are we returning from a syscall? */
-                       beq-    cr0,thread_return                                       /* Nope, must be a thread return... */
-                       b               .L_thread_syscall_return
+                       lwz             r0,SAVflags(r30)                                ; Grab the savearea flags
+                       andis.  r0,r0,SAVsyscall>>16                    ; Are we returning from a syscall?
+                       mr              r3,r30                                                  ; Copy pcb pointer into r3 in case we need it
+                       beq--   cr0,thread_return                               ; Nope, must be a thread return...
+                       b               .L_thread_syscall_return                ; Join up with the system call return...

 
 ;
 ;                      This is where we handle someone trying who did a thread_create followed
 ;                      by a thread_resume with no intervening thread_set_state.  Just make an
 ;                      empty context, initialize it to trash and let em execute at 0...
 
 ;
 ;                      This is where we handle someone trying who did a thread_create followed
 ;                      by a thread_resume with no intervening thread_set_state.  Just make an
 ;                      empty context, initialize it to trash and let em execute at 0...

+;
+
+                       .align  5

 
 makeDummyCtx:
 
 makeDummyCtx:

-                       bl              EXT(save_get)                           ; Get a save_area
-                       li              r0,0                                            ; Get a 0
-                       addi    r2,r3,savefp0                           ; Point past what we are clearing
-                       mr              r4,r3                                           ; Save the start
-                       
-cleardummy:    stw             r0,0(r4)                                        ; Clear stuff
-                       addi    r4,r4,4                                         ; Next word
-                       cmplw   r4,r2                                           ; Still some more?
-                       blt+    cleardummy                                      ; Yeah...
+                       bl              EXT(save_get)                                   ; Get a save_area
+                       li              r4,SAVgeneral                                   ; Get the general context type
+                       li              r0,0                                                    ; Get a 0
+                       stb             r4,SAVflags+2(r3)                               ; Set type
+                       addi    r2,r3,savefpscr+4                               ; Point past what we are clearing
+                       mr              r4,r3                                                   ; Save the start
+                       
+cleardummy:    stw             r0,0(r4)                                                ; Clear stuff
+                       addi    r4,r4,4                                                 ; Next word
+                       cmplw   r4,r2                                                   ; Still some more?
+                       blt+    cleardummy                                              ; Yeah...

                        
                        lis             r2,hi16(MSR_EXPORT_MASK_SET)    ; Set the high part of the user MSR
                        ori             r2,r2,lo16(MSR_EXPORT_MASK_SET) ; And the low part
                        
                        lis             r2,hi16(MSR_EXPORT_MASK_SET)    ; Set the high part of the user MSR
                        ori             r2,r2,lo16(MSR_EXPORT_MASK_SET) ; And the low part

-                       stw             r2,savesrr1(r3)                         ; Set the default user MSR
+                       stw             r2,savesrr1+4(r3)                               ; Set the default user MSR

        
        

-                       b               thread_return                           ; Go let em try to execute, hah!
+                       b               thread_return                                   ; Go let em try to execute, hah!

        
 /*
  * ihandler(type)
        
 /*
  * ihandler(type)


@@ -884,74 +845,95 @@ cleardummy:       stw             r0,0(r4)                                        ; Clear stuff
  *
  */
 
  *
  */
 

-ENTRY(ihandler, TAG_NO_FRAME_USED)
+                       .align  5
+                       .globl EXT(ihandler)
+LEXT(ihandler)                                                                         ; Interrupt handler */

 
 /*
  * get the value of istackptr, if it's zero then we're already on the
 
 /*
  * get the value of istackptr, if it's zero then we're already on the

- * interrupt stack, otherwise it points to a saved_state structure
- * at the top of the interrupt stack.
+ * interrupt stack.

  */
 
  */
 

-                       lwz             r10,savesrr1(r4)                        /* Get SRR1 */
-                       mfsprg  r25,0                                           /* Get the per_proc block */
-                       li              r14,0                                           /* Zero this for now */
-                       rlwinm. r13,r10,0,MSR_VEC_BIT,MSR_VEC_BIT       ; Was vector on?
-                       lwz             r16,PP_CPU_DATA(r25)            /* Assume we need this */
-                       crmove  cr1_eq,cr0_eq                           ; Remember vector enablement
-                       lwz             r1,PP_ISTACKPTR(r25)            /* Get the interrupt stack */
-                       rlwinm. r10,r10,0,MSR_FP_BIT,MSR_FP_BIT ; Was floating point on?
-                       li              r13,0                                           /* Zero this for now */
-                       lwz             r16,CPU_ACTIVE_THREAD(r16)      /* Get the thread pointer */
-
-                       beq+    cr1,ivecoff                                     ; Vector off, do not save vrsave...
-                       lwz             r7,savevrsave(r4)                       ; Get the VRSAVE register
-                       stw             r7,liveVRS(r25)                         ; Set the live value
-
-ivecoff:       li              r0,0                                            /* Get a constant 0 */
-                       cmplwi  cr1,r16,0                                       /* Are we still booting? */
-                       beq+    ifpoff                                          ; Skip if floating point is off...
-                       lwz             r9,savexfpscr(r4)                       ; Grab the just saved FPSCR
-                       stw             r9,liveFPSCR(r25)                       ; Make it the live copy
-
-ifpoff:                mr.             r1,r1                                           /* Is it active? */
-                       beq-    cr1,ihboot1                                     /* We're still coming up... */
-                       lwz             r13,THREAD_TOP_ACT(r16)         /* Pick up the active thread */
-                       lwz             r14,ACT_MACT_PCB(r13)           /* Now point to the PCB */
-
-ihboot1:       lwz             r9,saver1(r4)                           /* Pick up the 'rupt time stack */
-                       stw             r14,SAVprev(r4)                         /* Queue the new save area in the front */
-                       stw             r13,SAVact(r4)                          /* Point the savearea at its activation */
-                       beq-    cr1,ihboot4                                     /* We're still coming up... */
-                       stw             r4,ACT_MACT_PCB(r13)            /* Point to our savearea */
-
-ihboot4:       bne             .L_istackfree                           /* Nope... */
+                       lwz             r10,savesrr1+4(r4)                              ; Get SRR1 
+                       lwz             r7,savevrsave(r4)                               ; Get the VRSAVE register
+                       mfsprg  r13,1                                                   ; Get the current activation
+                       lwz             r25,ACT_PER_PROC(r13)                   ; Get the per_proc block 
+                       li              r14,0                                                   ; Zero this for now
+                       rlwinm. r16,r10,0,MSR_VEC_BIT,MSR_VEC_BIT       ; Was vector on?
+                       lwz             r1,PP_ISTACKPTR(r25)                    ; Get the interrupt stack
+                       li              r16,0                                                   ; Zero this for now
+
+                       beq+    ivecoff                                                 ; Vector off, do not save vrsave...
+                       stw             r7,liveVRS(r25)                                 ; Set the live value
+
+ivecoff:       li              r0,0                                                    ; Get a constant 0
+                       rlwinm  r5,r10,0,MSR_PR_BIT,MSR_PR_BIT  ; Are we trapping from supervisor state?
+                       mr.             r1,r1                                                   ; Is it active?
+                       cmplwi  cr2,r5,0                                                ; cr2_eq == 1 if yes
+                       mr              r16,r13
+                       lwz             r14,ACT_MACT_PCB(r13)                   ; Now point to the PCB 
+                       lwz             r9,saver1+4(r4)                                 ; Pick up the rupt time stack
+                       stw             r14,SAVprev+4(r4)                               ; Queue the new save area in the front
+                       stw             r13,SAVact(r4)                                  ; Point the savearea at its activation
+                       stw             r4,ACT_MACT_PCB(r13)                    ; Point to our savearea 
+                       beq             cr2,ifromk
+                       stw             r4,ACT_MACT_UPCB(r13)                   ; Store user savearea
+
+ifromk:                bne             .L_istackfree                                   ; Nope... 

 
 /* We're already on the interrupt stack, get back the old
  * stack pointer and make room for a frame
  */
 
 
 /* We're already on the interrupt stack, get back the old
  * stack pointer and make room for a frame
  */
 

-                       subi    r1,r9,FM_REDZONE                        /* Back up beyond the red zone */
-                       b               ihsetback                                       /* Go  set up the back chain... */
-       
+                       lwz             r10,PP_INTSTACK_TOP_SS(r25)             ; Get the top of the interrupt stack
+                       addi    r5,r9,INTSTACK_SIZE-FM_SIZE             ; Shift stack for bounds check
+                       subi    r1,r9,FM_REDZONE                                ; Back up beyond the red zone
+                       sub             r5,r5,r10                                               ; Get displacement into stack
+                       cmplwi  r5,INTSTACK_SIZE-FM_SIZE                ; Is the stack actually invalid?
+                       blt+    ihsetback                                               ; The stack is ok...
+
+                       lwz             r5,PP_DEBSTACK_TOP_SS(r25)              ; Pick up debug stack top
+                       subi    r5,r5,KERNEL_STACK_SIZE-FM_SIZE ; Adjust to start of stack
+                       sub             r5,r1,r5                                                ; Get displacement into debug stack
+                       cmplwi  cr2,r5,KERNEL_STACK_SIZE-FM_SIZE        ; Check if we are on debug stack
+                       blt+    cr2,ihsetback                                   ; Yeah, that is ok too...
+
+                       lis             r0,hi16(Choke)                                  ; Choke code
+                       ori             r0,r0,lo16(Choke)                               ; and the rest
+                       li              r3,failStack                                    ; Bad stack code
+                       sc                                                                              ; System ABEND
+
+intUnalignedStk:
+                       lis             r0,hi16(Choke)                                  ; Choke code
+                       ori             r0,r0,lo16(Choke)                               ; and the rest
+                       li              r3,failUnalignedStk                             ; Unaligned stack code
+                       sc                                                                              ; System ABEND
+
+                       .align  5
+                       

 .L_istackfree:
 .L_istackfree:

-                       lwz             r10,SAVflags(r4)                        
-                       stw             r0,PP_ISTACKPTR(r25)            /* Mark the stack in use */
-                       oris    r10,r10,HIGH_ADDR(SAVrststk)    /* Indicate we reset stack when we return from this one */
-                       stw             r10,SAVflags(r4)                        /* Stick it back */             
+                       rlwinm. r0,r1,0,28,31                                   ; Check if stack is aligned (and get 0)
+                       lwz             r10,SAVflags(r4)                                ; Get savearea flags
+                       bne--   intUnalignedStk                                 ; Stack is unaligned...
+                       stw             r0,PP_ISTACKPTR(r25)                    ; Mark the stack in use 
+                       oris    r10,r10,hi16(SAVrststk)                 ; Indicate we reset stack when we return from this one 
+                       stw             r10,SAVflags(r4)                                ; Stick it back         

        
        

-       /*
-        * To summarise, when we reach here, the state has been saved and
-        * the stack is marked as busy. We now generate a small
-        * stack frame with backpointers to follow the calling
-        * conventions. We set up the backpointers to the trapped
-        * routine allowing us to backtrace.
-        */
+/*
+ * To summarize, when we reach here, the state has been saved and
+ * the stack is marked as busy. We now generate a small
+ * stack frame with backpointers to follow the calling
+ * conventions. We set up the backpointers to the trapped
+ * routine allowing us to backtrace.
+ */

        
        

-ihsetback:     subi    r1,r1,FM_SIZE                           /* Make a new frame */
-                       stw             r9,FM_BACKPTR(r1)                       /* point back to previous stackptr */
+ihsetback:     subi    r1,r1,FM_SIZE                                   ; Make a new frame 
+                       stw             r9,FM_BACKPTR(r1)                               ; Point back to previous stackptr

                
 #if VERIFYSAVE
                
 #if VERIFYSAVE

-                       bl              versave                                         ; (TEST/DEBUG)
+                       beq-    cr1,ihbootnover                                 ; (TEST/DEBUG)
+                       bl              versave                                                 ; (TEST/DEBUG)
+ihbootnover:                                                                           ; (TEST/DEBUG)

 #endif
 
 #if    DEBUG
 #endif
 
 #if    DEBUG


@@ -959,14 +941,27 @@ ihsetback:        subi    r1,r1,FM_SIZE                           /* Make a new frame */
  * which links back to the trapped routine. The second is
  * that which the C routine below will need
  */
  * which links back to the trapped routine. The second is
  * that which the C routine below will need
  */

-                       lwz             r5,savesrr0(r4)                         /* Get interrupt address */
-                       stw             r5,FM_LR_SAVE(r1)                       /* save old instr ptr as LR value */
-                       stwu    r1,-FM_SIZE(r1)                         /* Make another new frame for C routine */
+                       lwz             r5,savesrr0+4(r4)                               ; Get interrupt address 
+                       stw             r5,FM_LR_SAVE(r1)                               ; save old instr ptr as LR value 
+                       stwu    r1,-FM_SIZE(r1)                                 ; Make another new frame for C routine

 #endif /* DEBUG */
 
 #endif /* DEBUG */
 

-                       lwz             r5,savedsisr(r4)                        /* Get the DSISR */
-                       lwz             r6,savedar(r4)                          /* Get the DAR */
+                       mr              r31,r3
+                       mr              r30,r4
+
+                       lwz             r3,SAVtime+4(r4)
+                       addi    r4,r13,SYSTEM_TIMER
+                       bl              EXT(timer_event)
+
+                       mr              r3,r31
+                       mr              r4,r30
+                       lwz             r5,savedsisr(r30)                               ; Get the DSISR
+                       lwz             r6,savedar+4(r30)                               ; Get the DAR 

                        
                        

+#if FPFLOOD
+                       stfd    f31,emfp31(r25)                                 ; (TEST/DEBUG)
+#endif
+

                        bl      EXT(interrupt)
 
 
                        bl      EXT(interrupt)
 
 


@@ -976,28 +971,24 @@ ihsetback:        subi    r1,r1,FM_SIZE                           /* Make a new frame */
  */
                        .globl EXT(ihandler_ret)
 
  */
                        .globl EXT(ihandler_ret)
 

-LEXT(ihandler_ret)                                                             /* Marks our return point from debugger entry */
+LEXT(ihandler_ret)                                                                     ; Marks our return point from debugger entry

 
 

-                       mfmsr   r0                                                      /* Get our MSR */
-                       rlwinm  r0,r0,0,MSR_EE_BIT+1,MSR_EE_BIT-1       /* Flip off the interrupt enabled bit */
-                       mtmsr   r0                                                      /* Make sure interrupts are disabled */
-                       mfsprg  r10,0                                           /* Get the per_proc block */
+                       lis             r10,hi16(MASK(MSR_VEC))                 ; Get the vector enable
+                       mfmsr   r0                                                              ; Get our MSR
+                       ori             r10,r10,lo16(MASK(MSR_FP)|MASK(MSR_EE)) ; Add in FP and EE
+                       andc    r0,r0,r10                                               ; Turn off VEC, FP, and EE
+                       mtmsr   r0                                                              ; Make sure interrupts are disabled
+                       mfsprg  r8,1                                                    ; Get the current activation
+                       lwz             r10,ACT_PER_PROC(r8)                    ; Get the per_proc block 

                
                

-                       lwz             r8,PP_CPU_DATA(r10)                     /* Get the CPU data area */
-                       lwz             r7,SAVflags(r3)                         /* Pick up the flags */
-                       lwz             r8,CPU_ACTIVE_THREAD(r8)        /* and the active thread */
-                       lwz             r9,SAVprev(r3)                          /* Get previous save area */
-                       cmplwi  cr1,r8,0                                        /* Are we still initializing? */
-                       lwz             r12,savesrr1(r3)                        /* Get the MSR we will load on return */
-                       beq-    cr1,ihboot2                                     /* Skip if we are still in init... */
-                       lwz             r8,THREAD_TOP_ACT(r8)           /* Pick up the active thread */
-
-ihboot2:       andis.  r11,r7,HIGH_ADDR(SAVrststk)     /* Is this the first on the stack? */
-                       beq-    cr1,ihboot3                                     /* Skip if we are still in init... */
-                       stw             r9,ACT_MACT_PCB(r8)                     /* Point to previous context savearea */
-
-ihboot3:       mr              r4,r3                                           /* Move the savearea pointer */
-                       beq             .L_no_int_ast2                          /* Get going if not the top o' stack... */
+                       lwz             r7,SAVflags(r3)                                 ; Pick up the flags
+                       lwz             r9,SAVprev+4(r3)                                ; Get previous save area
+                       cmplwi  cr1,r8,0                                                ; Are we still initializing?
+                       lwz             r12,savesrr1+4(r3)                              ; Get the MSR we will load on return 
+                       andis.  r11,r7,hi16(SAVrststk)                  ; Is this the first on the stack?
+                       stw             r9,ACT_MACT_PCB(r8)                             ; Point to previous context savearea 
+                       mr              r4,r3                                                   ; Move the savearea pointer
+                       beq             .L_no_int_ast2                                  ; Get going if not the top-o-stack...

 
 
 /* We're the last frame on the stack. Restore istackptr to empty state.
 
 
 /* We're the last frame on the stack. Restore istackptr to empty state.


@@ -1006,29 +997,25 @@ ihboot3: mr              r4,r3                                           /* Move the savearea pointer */
  *    returning to user mode
  *    returning to a kloaded server
  */
  *    returning to user mode
  *    returning to a kloaded server
  */

-                       lwz             r9,PP_INTSTACK_TOP_SS(r10)      /* Get the empty stack value */
-                       lwz             r5,PP_CPU_DATA(r10)                     /* Get cpu_data ptr */
-                       andc    r7,r7,r11                                       /* Remove the stack reset bit in case we pass this one */
-                       stw             r9,PP_ISTACKPTR(r10)            /* Save that saved state ptr */
-                       lwz             r3,CPU_PREEMPTION_LEVEL(r5)     /* Get preemption level */
-                       stw             r7,SAVflags(r4)                         /* Save the flags */
-                       cmplwi  r3, 0                                           /* Check for preemption */
-                       bne             .L_no_int_ast                           /* Don't preempt if level is not zero */
-                       andi.   r6,r12,MASK(MSR_PR)                     /* privilege mode  */
-                       lwz             r11,PP_NEED_AST(r10)            /* Get the AST request address */
-                       lwz             r11,0(r11)                                      /* Get the request */
-                       beq-    .L_kernel_int_ast                       /* In kernel space, AST_URGENT check */
-                       li              r3,T_AST                                        /* Assume the worst */
-                       mr.             r11,r11                                         /* Are there any pending? */
-                       beq             .L_no_int_ast                           /* Nope... */
+                       lwz             r9,PP_INTSTACK_TOP_SS(r10)              ; Get the empty stack value 
+                       andc    r7,r7,r11                                               ; Remove the stack reset bit in case we pass this one
+                       stw             r9,PP_ISTACKPTR(r10)                    ; Save that saved state ptr 
+                       lwz             r3,ACT_PREEMPT_CNT(r8)                  ; Get preemption level 
+                       stw             r7,SAVflags(r4)                                 ; Save the flags
+                       cmplwi  r3, 0                                                   ; Check for preemption
+                       bne             .L_no_int_ast                                   ; Do not preempt if level is not zero
+                       andi.   r6,r12,MASK(MSR_PR)                             ; privilege mode
+                       lwz             r11,PP_PENDING_AST(r10)                 ; Get the pending AST mask
+                       beq-    .L_kernel_int_ast                               ; In kernel space, AST_URGENT check
+                       li              r3,T_AST                                                ; Assume the worst
+                       mr.             r11,r11                                                 ; Are there any pending? 
+                       beq             .L_no_int_ast                                   ; Nope... 

                        b               .L_call_thandler
 
 .L_kernel_int_ast:
                        b               .L_call_thandler
 
 .L_kernel_int_ast:

-                       andi.   r11,r11,AST_URGENT                      /* AST_URGENT */
-                       li              r3,T_PREEMPT                            /* Assume the worst */
-                       beq             .L_no_int_ast                           /* Nope... */
-
-.L_call_thandler:
+                       andi.   r11,r11,AST_URGENT                              ; Do we have AST_URGENT?
+                       li              r3,T_PREEMPT                                    ; Assume the worst
+                       beq             .L_no_int_ast                                   ; Nope... 

 
 /*
  * There is a pending AST. Massage things to make it look like
 
 /*
  * There is a pending AST. Massage things to make it look like


@@ -1038,17 +1025,20 @@ ihboot3:        mr              r4,r3                                           /* Move the savearea pointer */
  * trap instead of performing an rfi.
  */
 
  * trap instead of performing an rfi.
  */
 

-                       stw             r3,saveexception(r4)            /* Set the exception code to T_AST/T_PREEMPT */
-                       b               EXT(thandler)                           /* hyperspace into AST trap */
+.L_call_thandler:
+                       stw             r3,saveexception(r4)                    ; Set the exception code to T_AST/T_PREEMPT
+                       b               EXT(thandler)                                   ; We need to preempt so treat like a trap...

 
 .L_no_int_ast: 
 
 .L_no_int_ast: 

-                       mr              r3,r4                                           ; Get into the right register for common code
+                       mr              r3,r4                                                   ; Get into the right register for common code
+                       

 .L_no_int_ast2:        
 .L_no_int_ast2:        

-                       rlwinm  r7,r7,0,15,13                           /* Clear the syscall bit */
-                       li              r4,0                                            ; Assume for a moment that we are in init
-                       stw             r7,SAVflags(r3)                         /* Set the flags */
-                       beq-    cr1,chkfac                                      ; Jump away if we are in init...
-                       lwz             r4,ACT_MACT_PCB(r8)                     ; Get the new level marker
+                       rlwinm  r7,r7,0,15,13                                   ; Clear the syscall flag
+                       li              r4,0                                                    ; Assume for a moment that we are in init
+                       stw             r7,SAVflags(r3)                                 ; Set the flags with cleared syscall flag
+                       beq--   cr1,chkfac                                              ; Jump away if we are in init...
+
+                       lwz             r4,ACT_MACT_PCB(r8)                             ; Get the new level marker

 
 
 ;
 
 
 ;


@@ -1063,375 +1053,436 @@ ihboot3:      mr              r4,r3                                           /* Move the savearea pointer */
 ;                              R8  = pointer to activation
 ;                              R10 = per_proc block
 ;
 ;                              R8  = pointer to activation
 ;                              R10 = per_proc block
 ;

-chkfac:                mr.             r8,r8                                           ; Are we still in boot?
-                       beq-    chkenax                                         ; Yeah, skip it all...
-                       
-                       lwz             r20,ACT_MACT_FPUlvl(r8)         ; Get the FPU level
-                       lwz             r12,savesrr1(r3)                        ; Get the current MSR
-                       cmplw   r20,r3                                          ; Are we returning from the active level?
-                       lwz             r23,PP_FPU_THREAD(r10)          ; Get floating point owner
-                       rlwinm  r12,r12,0,MSR_FP_BIT+1,MSR_FP_BIT-1     ; Turn off floating point for now
-                       cmplw   cr1,r23,r8                                      ; Are we the facility owner?
-                       lhz             r26,PP_CPU_NUMBER(r10)          ; Get the current CPU number
-                       beq-    chkfpfree                                       ; Leaving active level, can not possibly enable...
-                       bne-    cr1,chkvec                                      ; Not our facility, nothing to do here...
+;                      Note that barring unforseen crashes, there is no escape from this point
+;                      on. We WILL call exception_exit and launch this context. No worries
+;                      about preemption or interruptions here.
+;
+;                      Note that we will set up R26 with whatever context we will be launching,
+;                      so it will indicate the current, or the deferred it it is set and we
+;                      are going to user state.  CR2_eq will be set to indicate deferred.
+;

 
 

-#if FPVECDBG
-                       lis             r0,HIGH_ADDR(CutTrace)          ; (TEST/DEBUG)
-                       li              r2,0x3301                                       ; (TEST/DEBUG)
-                       oris    r0,r0,LOW_ADDR(CutTrace)        ; (TEST/DEBUG)
-                       sc                                                                      ; (TEST/DEBUG)
-#endif 
+chkfac:                lwz             r29,savesrr1+4(r3)                              ; Get the current MSR
+                       mr.             r28,r8                                                  ; Are we still in boot?
+                       mr              r31,r10                                                 ; Move per_proc address
+                       mr              r30,r4                                                  ; Preserve new level
+                       mr              r27,r3                                                  ; Save the old level
+                       beq--   chkenax                                                 ; Yeah, skip it all...
+                       
+                       rlwinm. r0,r29,0,MSR_PR_BIT,MSR_PR_BIT  ; Are we going into user state?
+
+                       lwz             r20,curctx(r28)                                 ; Get our current context
+                       lwz             r26,deferctx(r28)                               ; Get any deferred context switch
+                       li              r0,1                                                    ; Get set to hold off quickfret
+                       rlwinm  r29,r29,0,MSR_FP_BIT+1,MSR_FP_BIT-1     ; Turn off floating point for now
+                       lwz             r21,FPUlevel(r20)                               ; Get the facility level
+                       cmplwi  cr2,r26,0                                               ; Are we going into a deferred context later?
+                       rlwinm  r29,r29,0,MSR_VEC_BIT+1,MSR_VEC_BIT-1   ; Turn off vector for now
+                       crnor   cr2_eq,cr0_eq,cr2_eq                    ; Set cr2_eq if going to user state and there is deferred
+                       lhz             r19,PP_CPU_NUMBER(r31)                  ; Get our CPU number
+                       cmplw   r27,r21                                                 ; Are we returning from the active level?
+                       stw             r0,holdQFret(r31)                               ; Make sure we hold off releasing quickfret
+                       bne++   fpuchkena                                               ; Nope...

 
 

-                       lwz             r24,ACT_MACT_FPUcpu(r8)         ; Get the CPU this context was enabled on last
-                       cmplw   r4,r20                                          ; Are we going to be in the right level?
-                       cmplw   cr1,r24,r26                                     ; Are we on the right CPU?
-                       li              r0,0                                            ; Get a constant 0
-                       beq+    cr1,chkfpnlvl                           ; Right CPU...
-                       
-                       stw             r0,PP_FPU_THREAD(r10)           ; Show facility unowned so we do not get back here
-                       b               chkvec                                          ; Go check out the vector facility...
-                       
-chkfpnlvl:     bne-    chkvec                                          ; Different level, can not enable...
-                       lwz             r24,ACT_MACT_FPU(r8)            ; Get the floating point save area
-                       ori             r12,r12,lo16(MASK(MSR_FP))      ; Enable facility
-                       mr.             r24,r24                                         ; Does the savearea exist?
-                       li              r0,1                                            ; Get set to invalidate
-                       beq-    chkvec                                          ; Nothing to invalidate...
-                       lwz             r25,SAVlvlfp(r24)                       ; Get the level of top savearea
-                       cmplw   r4,r25                                          ; Is the top one ours?
-                       bne+    chkvec                                          ; Not ours...
-                       stw             r0,SAVlvlfp(r24)                        ; Invalidate the first one
+;
+;                      First clean up any live context we are returning from
+;

 
 

-#if 0
-                       mfmsr   r0                                              ; (TEST/DEBUG)
-                       ori             r0,r0,0x2000                    ; (TEST/DEBUG)
-                       mtmsr   r0                                              ; (TEST/DEBUG)
-                       isync                                                   ; (TEST/DEBUG)
-                       
-                       stfd    f0,savevr0(r3)                  ; (TEST/DEBUG)
-                       stfd    f1,savevr0+8(r3)                ; (TEST/DEBUG)
-                       stfd    f2,savevr0+0x10(r3)             ; (TEST/DEBUG)
-                       stfd    f3,savevr0+0x18(r3)             ; (TEST/DEBUG)
-                       stfd    f4,savevr0+0x20(r3)             ; (TEST/DEBUG)
-                       stfd    f5,savevr0+0x28(r3)             ; (TEST/DEBUG)
-                       stfd    f6,savevr0+0x30(r3)             ; (TEST/DEBUG)
-                       stfd    f7,savevr0+0x38(r3)             ; (TEST/DEBUG)
-                       stfd    f8,savevr0+0x40(r3)             ; (TEST/DEBUG)
-                       stfd    f9,savevr0+0x48(r3)             ; (TEST/DEBUG)
-                       stfd    f10,savevr0+0x50(r3)    ; (TEST/DEBUG)
-                       stfd    f11,savevr0+0x58(r3)    ; (TEST/DEBUG)
-                       stfd    f12,savevr0+0x60(r3)    ; (TEST/DEBUG)
-                       stfd    f13,savevr0+0x68(r3)    ; (TEST/DEBUG)
-                       stfd    f14,savevr0+0x70(r3)    ; (TEST/DEBUG)
-                       stfd    f15,savevr0+0x78(r3)    ; (TEST/DEBUG)
-                       stfd    f16,savevr0+0x80(r3)    ; (TEST/DEBUG)
-                       stfd    f17,savevr0+0x88(r3             ; (TEST/DEBUG)
-                       stfd    f18,savevr0+0x90(r3)    ; (TEST/DEBUG)
-                       stfd    f19,savevr0+0x98(r3)    ; (TEST/DEBUG)
-                       stfd    f20,savevr0+0xA0(r3)    ; (TEST/DEBUG)
-                       stfd    f21,savevr0+0xA8(r3)    ; (TEST/DEBUG)
-                       stfd    f22,savevr0+0xB0(r3)    ; (TEST/DEBUG)
-                       stfd    f23,savevr0+0xB8(r3)    ; (TEST/DEBUG)
-                       stfd    f24,savevr0+0xC0(r3)    ; (TEST/DEBUG)
-                       stfd    f25,savevr0+0xC8(r3)    ; (TEST/DEBUG)
-                       stfd    f26,savevr0+0xD0(r3)    ; (TEST/DEBUG)
-                       stfd    f27,savevr0+0xD8(r3)    ; (TEST/DEBUG)
-                       stfd    f28,savevr0+0xE0(r3)    ; (TEST/DEBUG)
-                       stfd    f29,savevr0+0xE8(r3)    ; (TEST/DEBUG)
-                       stfd    f30,savevr0+0xF0(r3)    ; (TEST/DEBUG)
-                       stfd    f31,savevr0+0xF8(r3)    ; (TEST/DEBUG)
-
-                       li              r2,64                                   ; (TEST/DEBUG)
-                       la              r20,savevr0(r3)                 ; (TEST/DEBUG)
-                       la              r21,savefp0(r24)                ; (TEST/DEBUG)
-                       
-ckmurderdeath2:
-                       lwz             r22,0(r20)                              ; (TEST/DEBUG)
-                       subic.  r2,r2,1                                 ; (TEST/DEBUG)
-                       lwz             r23,0(r21)                              ; (TEST/DEBUG)
-                       addi    r20,r20,4                               ; (TEST/DEBUG)
-                       cmplw   cr1,r22,r23                             ; (TEST/DEBUG)
-                       addi    r21,r21,4                               ; (TEST/DEBUG)
-                       bne-    cr1,diekilldead2                ; (TEST/DEBUG)
-                       bne+    ckmurderdeath2                  ; (TEST/DEBUG)
-                       b               dontdiekilldead2                ; (TEST/DEBUG)
-                       
-diekilldead2:                                                          ; (TEST/DEBUG)
-                       mr              r4,r24                                  ; (TEST/DEBUG)
-                       BREAKPOINT_TRAP                                 ; (TEST/DEBUG)
-                       
-dontdiekilldead2:
-                       lfd             f0,savevr0(r3)                  ; (TEST/DEBUG)
-                       lfd             f1,savevr0+8(r3)                ; (TEST/DEBUG)
+                       lwz             r22,FPUcpu(r20)                                 ; Get CPU this context was last dispatched on
+                       
+                       stw             r19,FPUcpu(r20)                                 ; Claim context for us
+                       
+                       eieio                                                                   ; Make sure this gets out before owner clear
+                       
+#if ppeSize != 16
+#error per_proc_entry is not 16bytes in size

 #endif
 #endif

+                       
+                       lis             r23,hi16(EXT(PerProcTable))             ; Set base PerProcTable
+                       slwi    r22,r22,4                                               ; Find offset to the owner per_proc_entry
+                       ori             r23,r23,lo16(EXT(PerProcTable)) ; Set base PerProcTable
+                       li              r24,FPUowner                                    ; Displacement to float owner
+                       add             r22,r23,r22                                             ; Point to the owner per_proc_entry
+                       lwz             r22,ppe_vaddr(r22)                              ; Point to the owner per_proc
+                       
+fpuinvothr:    lwarx   r23,r24,r22                                             ; Get the owner

 
 

+                       sub             r0,r23,r20                                              ; Subtract one from the other
+                       sub             r21,r20,r23                                             ; Subtract the other from the one
+                       or              r21,r21,r0                                              ; Combine them
+                       srawi   r21,r21,31                                              ; Get a 0 if equal or -1 of not
+                       and             r23,r23,r21                                             ; Make 0 if same, unchanged if not
+                       stwcx.  r23,r24,r22                                             ; Try to invalidate it
+                       bne--   fpuinvothr                                              ; Try again if there was a collision...

 
 

+                       isync

 
 

-                       b               chkvec                                          ; Go check out the vector facility...
+;
+;                      Now if there is a savearea associated with the popped context, release it.
+;                      Either way, pop the level to the top stacked context.
+;

 
 

-chkfpfree:     li              r0,0                                            ; Clear a register
-                       lwz             r24,ACT_MACT_FPU(r8)            ; Get the floating point save area
+                       lwz             r22,FPUsave(r20)                                ; Get pointer to the first savearea
+                       li              r21,0                                                   ; Assume we popped all the way out
+                       mr.             r22,r22                                                 ; Is there anything there?
+                       beq++   fpusetlvl                                               ; No, see if we need to enable...
+                       
+                       lwz             r21,SAVlevel(r22)                               ; Get the level of that savearea
+                       cmplw   r21,r27                                                 ; Is this the saved copy of the live stuff?
+                       bne             fpusetlvl                                               ; No, leave as is...

                        
                        

-                       bne-    cr1,chkfpnfr                            ; Not our facility, do not clear...
-                       stw             r0,PP_FPU_THREAD(r10)           ; Clear floating point owner
-chkfpnfr:
+                       lwz             r24,SAVprev+4(r22)                              ; Pick up the previous area
+                       li              r21,0                                                   ; Assume we popped all the way out
+                       mr.             r24,r24                                                 ; Any more context stacked?
+                       beq--   fpuonlyone                                              ; Nope...
+                       lwz             r21,SAVlevel(r24)                               ; Get the level associated with save

 
 

-#if FPVECDBG
-                       lis             r0,HIGH_ADDR(CutTrace)          ; (TEST/DEBUG)
-                       li              r2,0x3302                                       ; (TEST/DEBUG)
-                       oris    r0,r0,LOW_ADDR(CutTrace)        ; (TEST/DEBUG)
-                       sc                                                                      ; (TEST/DEBUG)
-#endif 
+fpuonlyone:    stw             r24,FPUsave(r20)                                ; Dequeue this savearea
+
+                       rlwinm  r3,r22,0,0,19                                   ; Find main savearea header

 
 

-                       mr.             r24,r24                                         ; Do we even have a savearea?
-                       beq+    chkvec                                          ; Nope...
+                       lwz             r8,quickfret(r31)                               ; Get the first in quickfret list (top)                                 
+                       lwz             r9,quickfret+4(r31)                             ; Get the first in quickfret list (bottom)                                      
+                       lwz             r2,SACvrswap(r3)                                ; Get the virtual to real conversion (top)
+                       lwz             r3,SACvrswap+4(r3)                              ; Get the virtual to real conversion (bottom)
+                       stw             r8,SAVprev(r22)                                 ; Link the old in (top)                                 
+                       stw             r9,SAVprev+4(r22)                               ; Link the old in (bottom)                                      
+                       xor             r3,r22,r3                                               ; Convert to physical
+                       stw             r2,quickfret(r31)                               ; Set the first in quickfret list (top)                                 
+                       stw             r3,quickfret+4(r31)                             ; Set the first in quickfret list (bottom)                                      

                        
 #if FPVECDBG
                        
 #if FPVECDBG

-                       rlwinm. r0,r24,0,0,15                           ; (TEST/DEBUG)
-                       bne+    notbadxxx1                                      ; (TEST/DEBUG)
-                       BREAKPOINT_TRAP                                         ; (TEST/DEBUG)
-notbadxxx1:                                                                            ; (TEST/DEBUG)                  
-                       lis             r0,HIGH_ADDR(CutTrace)          ; (TEST/DEBUG)
-                       li              r2,0x3303                                       ; (TEST/DEBUG)
-                       oris    r0,r0,LOW_ADDR(CutTrace)        ; (TEST/DEBUG)
-                       sc                                                                      ; (TEST/DEBUG)
-#endif 
+                       lis             r0,HIGH_ADDR(CutTrace)                  ; (TEST/DEBUG)
+                       li              r2,0x3301                                               ; (TEST/DEBUG)
+                       oris    r0,r0,LOW_ADDR(CutTrace)                ; (TEST/DEBUG)
+                       sc                                                                              ; (TEST/DEBUG)
+#endif                         

 
 

-                       lwz             r25,SAVlvlfp(r24)                       ; Get the level of top savearea
-                       cmplwi  r25,1                                           ; Is the top area invalid?
-                       cmplw   cr1,r25,r3                                      ; Is it for the returned from context?
-                       beq             fptoss                                          ; It is invalid...
-                       bne             cr1,chkvec                                      ; Not for the returned context...
+fpusetlvl:     stw             r21,FPUlevel(r20)                               ; Save the level
+               
+;
+;                      Here we check if we are at the right level
+;                      We need to check the level we are entering, not the one we are exiting.
+;                      Therefore, we will use the defer level if it is non-zero and we are
+;                      going into user state.
+;

                        
                        

-fptoss:                lwz             r25,SAVprefp(r24)                       ; Get previous savearea
-#if FPVECDBG
-                       lis             r0,HIGH_ADDR(CutTrace)          ; (TEST/DEBUG)
-                       li              r2,0x3304                                       ; (TEST/DEBUG)
-                       oris    r0,r0,LOW_ADDR(CutTrace)        ; (TEST/DEBUG)
-                       mr              r5,r25                                          ; (TEST/DEBUG)
-                       sc                                                                      ; (TEST/DEBUG)
-#endif 
-                       mr.             r25,r25                                         ; Is there one?
-                       stw             r25,ACT_MACT_FPU(r8)            ; Set the new pointer
-                       beq             fptoplvl                                        ; Nope, we are at the top...
-#if FPVECDBG           
-                       rlwinm. r0,r25,0,0,15                           ; (TEST/DEBUG)
-                       bne+    notbadxxx2                                      ; (TEST/DEBUG)
-                       BREAKPOINT_TRAP                                         ; (TEST/DEBUG)
-notbadxxx2:                                                                            ; (TEST/DEBUG)                  
-#endif         
-                       lwz             r25,SAVlvlfp(r25)                       ; Get the new level
-
-fptoplvl:      lwz             r19,SAVflags(r24)                       ; Get the savearea flags
-#if FPVECDBG
-                       rlwinm. r0,r19,0,1,1                            ; (TEST/DEBUG)
-                       bne+    donotdie3                                       ; (TEST/DEBUG)
-                       BREAKPOINT_TRAP                                         ; (TEST/DEBUG)
-donotdie3:                                                                             ; (TEST/DEBUG)
-#endif
+fpuchkena:     bt--    cr2_eq,fpuhasdfrd                               ; Skip if deferred, R26 already set up...
+                       mr              r26,r20                                                 ; Use the non-deferred value
+                       
+fpuhasdfrd:    
+#if 0
+                       rlwinm. r0,r29,0,MSR_PR_BIT,MSR_PR_BIT  ; (TEST/DEBUG) Going into user state?
+                       beq             fpunusrstt                                              ; (TEST/DEBUG) Nope...  
+                       lwz             r23,FPUlevel(r26)                               ; (TEST/DEBUG) Get the level ID
+                       lwz             r24,FPUsave(r26)                                ; (TEST/DEBUG) Get the first savearea
+                       mr.             r23,r23                                                 ; (TEST/DEBUG) Should be level 0
+                       beq++   fpulvl0                                                 ; (TEST/DEBUG) Yes...
+
+                       lis             r0,hi16(Choke)                                  ; (TEST/DEBUG) Choke code
+                       ori             r0,r0,lo16(Choke)                               ; (TEST/DEBUG) and the rest
+                       sc                                                                              ; (TEST/DEBUG) System ABEND
+                       
+fpulvl0:       mr.             r24,r24                                                 ; (TEST/DEBUG) Any context?
+                       beq             fpunusrstt                                              ; (TEST/DEBUG) No...
+                       lwz             r23,SAVlevel(r24)                               ; (TEST/DEBUG) Get level of context
+                       lwz             r21,SAVprev+4(r24)                              ; (TEST/DEBUG) Get previous pointer
+                       mr.             r23,r23                                                 ; (TEST/DEBUG) Is this our user context?
+                       beq++   fpulvl0b                                                ; (TEST/DEBUG) Yes...
+
+                       lis             r0,hi16(Choke)                                  ; (TEST/DEBUG) Choke code
+                       ori             r0,r0,lo16(Choke)                               ; (TEST/DEBUG) and the rest
+                       sc                                                                              ; (TEST/DEBUG) System ABEND
+                       
+fpulvl0b:      mr.             r21,r21                                                 ; (TEST/DEBUG) Is there a forward chain?
+                       beq++   fpunusrstt                                              ; (TEST/DEBUG) Nope...
+
+                       lis             r0,hi16(Choke)                                  ; (TEST/DEBUG) Choke code
+                       ori             r0,r0,lo16(Choke)                               ; (TEST/DEBUG) and the rest
+                       sc                                                                              ; (TEST/DEBUG) System ABEND
+                                               
+fpunusrstt:                                                                                    ; (TEST/DEBUG)
+#endif                         
+                       
+                       lwz             r21,FPUowner(r31)                               ; Get the ID of the live context
+                       lwz             r23,FPUlevel(r26)                               ; Get the level ID
+                       lwz             r24,FPUcpu(r26)                                 ; Get the CPU that the context was last dispatched on
+                       cmplw   cr3,r26,r21                                             ; Do we have the live context?
+                       cmplw   r30,r23                                                 ; Are we about to launch the live level?
+                       bne--   cr3,chkvec                                              ; No, can not possibly enable...
+                       cmplw   cr1,r19,r24                                             ; Was facility used on this processor last?
+                       bne--   chkvec                                                  ; No, not live...
+                       bne--   cr1,chkvec                                              ; No, wrong cpu, have to enable later....
+                       
+                       lwz             r24,FPUsave(r26)                                ; Get the first savearea
+                       mr.             r24,r24                                                 ; Any savearea?
+                       beq++   fpuena                                                  ; Nope...
+                       lwz             r25,SAVlevel(r24)                               ; Get the level of savearea
+                       lwz             r0,SAVprev+4(r24)                               ; Get the previous
+
+                       cmplw   r30,r25                                                 ; Is savearea for the level we are launching?
+                       bne++   fpuena                                                  ; No, just go enable...
+                       
+                       stw             r0,FPUsave(r26)                                 ; Pop the chain
+
+                       rlwinm  r3,r24,0,0,19                                   ; Find main savearea header
+
+                       lwz             r8,quickfret(r31)                               ; Get the first in quickfret list (top)                                 
+                       lwz             r9,quickfret+4(r31)                             ; Get the first in quickfret list (bottom)                                      
+                       lwz             r2,SACvrswap(r3)                                ; Get the virtual to real conversion (top)
+                       lwz             r3,SACvrswap+4(r3)                              ; Get the virtual to real conversion (bottom)
+                       stw             r8,SAVprev(r24)                                 ; Link the old in (top)                                 
+                       stw             r9,SAVprev+4(r24)                               ; Link the old in (bottom)                                      
+                       xor             r3,r24,r3                                               ; Convert to physical
+                       stw             r2,quickfret(r31)                               ; Set the first in quickfret list (top)                                 
+                       stw             r3,quickfret+4(r31)                             ; Set the first in quickfret list (bottom)                                      

 
 #if FPVECDBG
 
 #if FPVECDBG

-                       lis             r0,HIGH_ADDR(CutTrace)          ; (TEST/DEBUG)
-                       li              r2,0x3305                                       ; (TEST/DEBUG)
-                       oris    r0,r0,LOW_ADDR(CutTrace)        ; (TEST/DEBUG)
-                       sc                                                                      ; (TEST/DEBUG)
-#endif 
-                       rlwinm  r22,r24,0,0,19                          ; Round down to the base savearea block
-                       rlwinm  r19,r19,0,2,0                           ; Remove the floating point in use flag
-                       stw             r25,ACT_MACT_FPUlvl(r8)         ; Set the new top level
-                       andis.  r0,r19,hi16(SAVinuse)           ; Still in use?
-                       stw             r19,SAVflags(r24)                       ; Set the savearea flags
-                       bne-    chkvec                                          ; Yes, go check out vector...
-#if FPVECDBG
-                       lis             r0,HIGH_ADDR(CutTrace)          ; (TEST/DEBUG)
-                       li              r2,0x3306                                       ; (TEST/DEBUG)
-                       oris    r0,r0,LOW_ADDR(CutTrace)        ; (TEST/DEBUG)
-                       sc                                                                      ; (TEST/DEBUG)
-#endif 
-#if FPVECDBG           
-                       rlwinm. r0,r24,0,0,15                           ; (TEST/DEBUG)
-                       bne+    notbadxxx3                                      ; (TEST/DEBUG)
-                       BREAKPOINT_TRAP                                         ; (TEST/DEBUG)
-notbadxxx3:                                                                            ; (TEST/DEBUG)                  
-#endif         
-                       lwz             r23,SACvrswap(r22)                      ; Get the conversion from virtual to real
-                       lwz             r20,PP_QUICKFRET(r10)           ; Get the old quick fret head
-                       xor             r23,r24,r23                                     ; Convert to physical
-                       stw             r20,SAVqfret(r24)                       ; Back chain the quick release queue
-                       stw             r23,PP_QUICKFRET(r10)           ; Anchor it
+                       lis             r0,HIGH_ADDR(CutTrace)                  ; (TEST/DEBUG)
+                       li              r2,0x3302                                               ; (TEST/DEBUG)
+                       oris    r0,r0,LOW_ADDR(CutTrace)                ; (TEST/DEBUG)
+                       sc                                                                              ; (TEST/DEBUG)
+#endif                         

 
 

-;
-;                      Check out vector stuff (and translate savearea to physical for exit)
-;
+fpuena:                ori             r29,r29,lo16(MASK(MSR_FP))              ; Enable facility                       
+                       

 chkvec:                
 chkvec:                

-                       lwz             r20,ACT_MACT_VMXlvl(r8)         ; Get the vector level
-                       lwz             r23,PP_VMX_THREAD(r10)          ; Get vector owner
-                       cmplw   r20,r3                                          ; Are we returning from the active level?
-                       rlwinm  r12,r12,0,MSR_VEC_BIT+1,MSR_VEC_BIT-1   ; Turn off vector for now
-                       cmplw   cr1,r23,r8                                      ; Are we the facility owner?
-                       beq-    chkvecfree                                      ; Leaving active level, can not possibly enable...
-                       bne-    cr1,setena                                      ; Not our facility, nothing to do here...

 
 

-#if FPVECDBG
-                       lis             r0,HIGH_ADDR(CutTrace)          ; (TEST/DEBUG)
-                       li              r2,0x3401                                       ; (TEST/DEBUG)
-                       oris    r0,r0,LOW_ADDR(CutTrace)        ; (TEST/DEBUG)
-                       sc                                                                      ; (TEST/DEBUG)
-#endif 
+                       lwz             r21,VMXlevel(r20)                               ; Get the facility level
+               
+                       cmplw   r27,r21                                                 ; Are we returning from the active level?
+                       bne+    vmxchkena                                               ; Nope...
+                       

 
 

-                       lwz             r24,ACT_MACT_VMXcpu(r8)         ; Get the CPU this context was enabled on last
-                       cmplw   r4,r20                                          ; Are we going to be in the right level?
-                       cmplw   cr1,r24,r26                                     ; Are we on the right CPU?
-                       li              r0,0                                            ; Get a constant 0
-                       beq+    cr1,chkvecnlvl                          ; Right CPU...
-                       
-                       stw             r0,PP_VMX_THREAD(r10)           ; Show facility unowned so we do not get back here
-                       b               setena                                          ; Go actually exit...
-                       
-chkvecnlvl:    bne-    setena                                          ; Different level, can not enable...
-                       lwz             r24,ACT_MACT_VMX(r8)            ; Get the vector save area
-                       oris    r12,r12,hi16(MASK(MSR_VEC))     ; Enable facility
-                       mr.             r24,r24                                         ; Does the savearea exist?
-                       li              r0,1                                            ; Get set to invalidate
-                       beq-    setena                                          ; Nothing to invalidate...
-                       lwz             r25,SAVlvlvec(r24)                      ; Get the level of top savearea
-                       cmplw   r4,r25                                          ; Is the top one ours?
-                       bne+    setena                                          ; Not ours...
-                       stw             r0,SAVlvlvec(r24)                       ; Invalidate the first one
-                       b               setena                                          ; Actually exit...
-
-chkvecfree:    li              r0,0                                            ; Clear a register
-                       lwz             r24,ACT_MACT_VMX(r8)            ; Get the vector save area
-                       bne-    cr1,chkvecnfr                           ; Not our facility, do not clear...
-                       stw             r0,PP_VMX_THREAD(r10)           ; Clear vector owner
-chkvecnfr:
+;
+;                      First clean up any live context we are returning from
+;
+
+                       lwz             r22,VMXcpu(r20)                                 ; Get CPU this context was last dispatched on

                        
                        

-#if FPVECDBG
-                       lis             r0,HIGH_ADDR(CutTrace)          ; (TEST/DEBUG)
-                       li              r2,0x3402                                       ; (TEST/DEBUG)
-                       oris    r0,r0,LOW_ADDR(CutTrace)        ; (TEST/DEBUG)
-                       sc                                                                      ; (TEST/DEBUG)
-#endif 
+                       stw             r19,VMXcpu(r20)                                 ; Claim context for us
+                       
+                       eieio                                                                   ; Make sure this gets out before owner clear
+                       
+                       lis             r23,hi16(EXT(PerProcTable))             ; Set base PerProcTable
+                       slwi    r22,r22,4                                               ; Find offset to the owner per_proc_entry
+                       ori             r23,r23,lo16(EXT(PerProcTable)) ; Set base PerProcTable
+                       li              r24,VMXowner                                    ; Displacement to float owner
+                       add             r22,r23,r22                                             ; Point to the owner per_proc_entry
+                       lwz             r22,ppe_vaddr(r22)                              ; Point to the owner per_proc
+                       
+vmxinvothr:    lwarx   r23,r24,r22                                             ; Get the owner
+
+                       sub             r0,r23,r20                                              ; Subtract one from the other
+                       sub             r21,r20,r23                                             ; Subtract the other from the one
+                       or              r21,r21,r0                                              ; Combine them
+                       srawi   r21,r21,31                                              ; Get a 0 if equal or -1 of not
+                       and             r23,r23,r21                                             ; Make 0 if same, unchanged if not
+                       stwcx.  r23,r24,r22                                             ; Try to invalidate it
+                       bne--   vmxinvothr                                              ; Try again if there was a collision...

 
 

-                       mr.             r24,r24                                         ; Do we even have a savearea?
-                       beq+    setena                                          ; Nope...
+                       isync
+
+;
+;                      Now if there is a savearea associated with the popped context, release it.
+;                      Either way, pop the level to the top stacked context.
+;
+
+                       lwz             r22,VMXsave(r20)                                ; Get pointer to the first savearea
+                       li              r21,0                                                   ; Assume we popped all the way out
+                       mr.             r22,r22                                                 ; Is there anything there?
+                       beq++   vmxsetlvl                                               ; No, see if we need to enable...

                        
                        

-#if FPVECDBG
-                       lis             r0,HIGH_ADDR(CutTrace)          ; (TEST/DEBUG)
-                       li              r2,0x3403                                       ; (TEST/DEBUG)
-                       oris    r0,r0,LOW_ADDR(CutTrace)        ; (TEST/DEBUG)
-                       sc                                                                      ; (TEST/DEBUG)
-#endif 
-                       lwz             r25,SAVlvlvec(r24)                      ; Get the level
-                       cmplwi  r25,1                                           ; Is the top area invalid?
-                       cmplw   cr1,r25,r3                                      ; Is it for the returned from context?
-                       beq             vectoss                                         ; It is invalid...
-                       bne             cr1,setena                                      ; Not for the returned context...
+                       lwz             r21,SAVlevel(r22)                               ; Get the level of that savearea
+                       cmplw   r21,r27                                                 ; Is this the saved copy of the live stuff?
+                       bne             vmxsetlvl                                               ; No, leave as is...

                        
                        

-vectoss:       lwz             r25,SAVprevec(r24)                      ; Get previous savearea
-#if FPVECDBG
-                       lis             r0,HIGH_ADDR(CutTrace)          ; (TEST/DEBUG)
-                       li              r2,0x3504                                       ; (TEST/DEBUG)
-                       oris    r0,r0,LOW_ADDR(CutTrace)        ; (TEST/DEBUG)
-                       mr              r5,r25                                          ; (TEST/DEBUG)
-                       sc                                                                      ; (TEST/DEBUG)
-#endif 
-                       mr.             r25,r25                                         ; Is there one?
-                       stw             r25,ACT_MACT_VMX(r8)            ; Set the new pointer
-                       beq             vectoplvl                                       ; Nope, we are at the top...
-                       lwz             r25,SAVlvlvec(r25)                      ; Get the new level
+                       lwz             r24,SAVprev+4(r22)                              ; Pick up the previous area
+                       li              r21,0                                                   ; Assume we popped all the way out
+                       mr.             r24,r24                                                 ; Any more context?
+                       beq--   vmxonlyone                                              ; Nope...
+                       lwz             r21,SAVlevel(r24)                               ; Get the level associated with save
+
+vmxonlyone:    stw             r24,VMXsave(r20)                                ; Dequeue this savearea
+                       
+                       rlwinm  r3,r22,0,0,19                                   ; Find main savearea header

 
 

-vectoplvl:     lwz             r19,SAVflags(r24)                       ; Get the savearea flags
+                       lwz             r8,quickfret(r31)                               ; Get the first in quickfret list (top)                                 
+                       lwz             r9,quickfret+4(r31)                             ; Get the first in quickfret list (bottom)                                      
+                       lwz             r2,SACvrswap(r3)                                ; Get the virtual to real conversion (top)
+                       lwz             r3,SACvrswap+4(r3)                              ; Get the virtual to real conversion (bottom)
+                       stw             r8,SAVprev(r22)                                 ; Link the old in (top)                                 
+                       stw             r9,SAVprev+4(r22)                               ; Link the old in (bottom)                                      
+                       xor             r3,r22,r3                                               ; Convert to physical
+                       stw             r2,quickfret(r31)                               ; Set the first in quickfret list (top)                                 
+                       stw             r3,quickfret+4(r31)                             ; Set the first in quickfret list (bottom)                                      

 
 #if FPVECDBG
 
 #if FPVECDBG

-                       lis             r0,HIGH_ADDR(CutTrace)          ; (TEST/DEBUG)
-                       li              r2,0x3405                                       ; (TEST/DEBUG)
-                       oris    r0,r0,LOW_ADDR(CutTrace)        ; (TEST/DEBUG)
-                       sc                                                                      ; (TEST/DEBUG)
-#endif 
-                       rlwinm  r22,r24,0,0,19                          ; Round down to the base savearea block
-                       rlwinm  r19,r19,0,3,1                           ; Remove the vector in use flag
-                       stw             r25,ACT_MACT_VMXlvl(r8)         ; Set the new top level
-                       andis.  r0,r19,hi16(SAVinuse)           ; Still in use?
-                       stw             r19,SAVflags(r24)                       ; Set the savearea flags
-                       bne-    setena                                          ; Yes, all done...
+                       lis             r0,HIGH_ADDR(CutTrace)                  ; (TEST/DEBUG)
+                       li              r2,0x3401                                               ; (TEST/DEBUG)
+                       oris    r0,r0,LOW_ADDR(CutTrace)                ; (TEST/DEBUG)
+                       sc                                                                              ; (TEST/DEBUG)
+#endif                         
+
+vmxsetlvl:     stw             r21,VMXlevel(r20)                               ; Save the level
+               
+;
+;                      Here we check if we are at the right level
+;
+                       
+vmxchkena:     lwz             r21,VMXowner(r31)                               ; Get the ID of the live context
+                       lwz             r23,VMXlevel(r26)                               ; Get the level ID
+                       cmplw   r26,r21                                                 ; Do we have the live context?
+                       lwz             r24,VMXcpu(r26)                                 ; Get the CPU that the context was last dispatched on
+                       bne--   setena                                                  ; No, can not possibly enable...
+                       cmplw   r30,r23                                                 ; Are we about to launch the live level?
+                       cmplw   cr1,r19,r24                                             ; Was facility used on this processor last?
+                       bne--   setena                                                  ; No, not live...
+                       bne--   cr1,setena                                              ; No, wrong cpu, have to enable later....
+                       
+                       lwz             r24,VMXsave(r26)                                ; Get the first savearea
+                       mr.             r24,r24                                                 ; Any savearea?
+                       beq++   vmxena                                                  ; Nope...
+                       lwz             r25,SAVlevel(r24)                               ; Get the level of savearea
+                       lwz             r0,SAVprev+4(r24)                               ; Get the previous
+                       cmplw   r30,r25                                                 ; Is savearea for the level we are launching?
+                       bne++   vmxena                                                  ; No, just go enable...
+
+                       stw             r0,VMXsave(r26)                                 ; Pop the chain
+                       
+                       rlwinm  r3,r24,0,0,19                                   ; Find main savearea header
+
+                       lwz             r8,quickfret(r31)                               ; Get the first in quickfret list (top)                                 
+                       lwz             r9,quickfret+4(r31)                             ; Get the first in quickfret list (bottom)                                      
+                       lwz             r2,SACvrswap(r3)                                ; Get the virtual to real conversion (top)
+                       lwz             r3,SACvrswap+4(r3)                              ; Get the virtual to real conversion (bottom)
+                       stw             r8,SAVprev(r24)                                 ; Link the old in (top)                                 
+                       stw             r9,SAVprev+4(r24)                               ; Link the old in (bottom)                                      
+                       xor             r3,r24,r3                                               ; Convert to physical
+                       stw             r2,quickfret(r31)                               ; Set the first in quickfret list (top)                                 
+                       stw             r3,quickfret+4(r31)                             ; Set the first in quickfret list (bottom)                                      
+

 #if FPVECDBG
 #if FPVECDBG

-                       lis             r0,HIGH_ADDR(CutTrace)          ; (TEST/DEBUG)
-                       li              r2,0x3406                                       ; (TEST/DEBUG)
-                       oris    r0,r0,LOW_ADDR(CutTrace)        ; (TEST/DEBUG)
-                       sc                                                                      ; (TEST/DEBUG)
-#endif                 
-                       lwz             r23,SACvrswap(r22)                      ; Get the conversion from virtual to real
-                       lwz             r20,PP_QUICKFRET(r10)           ; Get the old quick fret head
-                       xor             r23,r24,r23                                     ; Convert to physical
-                       stw             r20,SAVqfret(r24)                       ; Back chain the quick release queue
-                       stw             r23,PP_QUICKFRET(r10)           ; Anchor it
-
-setena:                rlwinm  r20,r12,(((31-vectorCngbit)+(MSR_VEC_BIT+1))&31),vectorCngbit,vectorCngbit      ; Set flag if we enabled vector
-                       rlwimi. r20,r12,(((31-floatCngbit)+(MSR_FP_BIT+1))&31),floatCngbit,floatCngbit  ; Set flag if we enabled floats
-                       beq             setenaa                                         ; Neither float nor vector turned on....
-                       
-                       lwz             r5,ACT_MACT_SPF(r8)                     ; Get activation copy
-                       lwz             r6,spcFlags(r10)                        ; Get per_proc copy
-                       or              r5,r5,r20                                       ; Set vector/float changed bits in activation
-                       or              r6,r6,r20                                       ; Set vector/float changed bits in per_proc
-                       stw             r5,ACT_MACT_SPF(r8)                     ; Set activation copy
-                       stw             r6,spcFlags(r10)                        ; Set per_proc copy
-
-setenaa:       stw             r12,savesrr1(r3)                        ; Turn facility on or off
-       
-                       mfdec   r24                                                     ; Get decrementer
-                       lwz             r22,qactTimer(r8)                       ; Get high order quick activation timer
-                       mr.             r24,r24                                         ; See if it has popped already...
-                       lwz             r23,qactTimer+4(r8)                     ; Get low order qact timer
-                       ble-    chkenax                                         ; We have popped or are just about to...
-                       
-segtb:         mftbu   r20                                                     ; Get the upper time base
-                       mftb    r21                                                     ; Get the low
-                       mftbu   r19                                                     ; Get upper again
-                       or.             r0,r22,r23                                      ; Any time set?
-                       cmplw   cr1,r20,r19                                     ; Did they change?
-                       beq+    chkenax                                         ; No time set....
-                       bne-    cr1,segtb                                       ; Timebase ticked, get them again...
-                       
-                       subfc   r6,r21,r23                                      ; Subtract current from qact time
-                       li              r0,0                                            ; Make a 0
-                       subfe   r5,r20,r22                                      ; Finish subtract
-                       subfze  r0,r0                                           ; Get a 0 if qact was bigger than current, -1 otherwise
-                       andc.   r12,r5,r0                                       ; Set 0 if qact has passed
-                       andc    r13,r6,r0                                       ; Set 0 if qact has passed
-                       bne             chkenax                                         ; If high order is non-zero, this is too big for a decrementer
-                       cmplw   r13,r24                                         ; Is this earlier than the decrementer? (logical compare takes care of high bit on)
-                       bge+    chkenax                                         ; No, do not reset decrementer...
-                       
-                       mtdec   r13                                                     ; Set our value
-
-chkenax:       lwz             r6,SAVflags(r3)                         ; Pick up the flags of the old savearea
+                       lis             r0,HIGH_ADDR(CutTrace)                  ; (TEST/DEBUG)
+                       li              r2,0x3402                                               ; (TEST/DEBUG)
+                       oris    r0,r0,LOW_ADDR(CutTrace)                ; (TEST/DEBUG)
+                       sc                                                                              ; (TEST/DEBUG)
+#endif                         
+                       
+vmxena:                oris    r29,r29,hi16(MASK(MSR_VEC))             ; Enable facility
+
+setena:                lwz             r18,umwSpace(r28)                               ; Get the space ID in case we are launching user
+                       rlwinm. r0,r29,0,MSR_PR_BIT,MSR_PR_BIT  ; Are we about to launch user state?
+                       li              r0,0                                                    ; Get set to release quickfret holdoff
+                       crmove  cr7_eq,cr0_eq                                   ; Remember if we are going to user state
+                       rlwimi. r20,r29,(((31-floatCngbit)+(MSR_FP_BIT+1))&31),floatCngbit,floatCngbit  ; Set flag if we enabled floats
+                       lwz             r19,deferctx(r28)                               ; Get any deferred facility context switch
+                       rlwinm  r20,r29,(((31-vectorCngbit)+(MSR_VEC_BIT+1))&31),vectorCngbit,vectorCngbit      ; Set flag if we enabled vector
+                       stw             r29,savesrr1+4(r27)                             ; Turn facility on or off
+                       stw             r0,holdQFret(r31)                               ; Release quickfret
+                       oris    r18,r18,hi16(umwSwitchAway)             ; Set the switch-away bit in case we go to user
+
+                       beq             setenaa                                                 ; Neither float nor vector turned on....
+                       
+                       lwz             r5,ACT_MACT_SPF(r28)                    ; Get activation copy
+                       lwz             r6,spcFlags(r31)                                ; Get per_proc copy
+                       or              r5,r5,r20                                               ; Set vector/float changed bits in activation
+                       or              r6,r6,r20                                               ; Set vector/float changed bits in per_proc
+                       stw             r5,ACT_MACT_SPF(r28)                    ; Set activation copy
+                       stw             r6,spcFlags(r31)                                ; Set per_proc copy
+
+setenaa:       mfdec   r24                                                             ; Get decrementer
+                       bf+             cr2_eq,nodefer                                  ; No deferred to switch to...
+                                               
+                       li              r20,0                                                   ; Clear this
+                       stw             r26,curctx(r28)                                 ; Make the facility context current
+                       stw             r20,deferctx(r28)                               ; Clear deferred context
+
+nodefer:       lwz             r22,qactTimer(r28)                              ; Get high order quick activation timer
+                       mr.             r24,r24                                                 ; See if it has popped already...
+                       lwz             r23,qactTimer+4(r28)                    ; Get low order qact timer
+                       ble-    chkifuser                                               ; We have popped or are just about to...
+                       
+segtb:         mftbu   r20                                                             ; Get the upper time base
+                       mftb    r21                                                             ; Get the low
+                       mftbu   r19                                                             ; Get upper again
+                       or.             r0,r22,r23                                              ; Any time set?
+                       cmplw   cr1,r20,r19                                             ; Did they change?
+                       beq++   chkifuser                                               ; No time set....
+                       bne--   cr1,segtb                                               ; Timebase ticked, get them again...
+                       
+                       subfc   r6,r21,r23                                              ; Subtract current from qact time
+                       li              r0,0                                                    ; Make a 0
+                       subfe   r5,r20,r22                                              ; Finish subtract
+                       subfze  r0,r0                                                   ; Get a 0 if qact was bigger than current, -1 otherwise
+                       andc.   r12,r5,r0                                               ; Set 0 if qact has passed
+                       andc    r13,r6,r0                                               ; Set 0 if qact has passed
+                       bne             chkifuser                                               ; If high order is non-zero, this is too big for a decrementer
+                       cmplw   r13,r24                                                 ; Is this earlier than the decrementer? (logical compare takes care of high bit on)
+                       bge++   chkifuser                                               ; No, do not reset decrementer...
+                       
+                       mtdec   r13                                                             ; Set our value
+
+chkifuser:     addi    r4,r28,SYSTEM_TIMER
+                       mftb    r3
+                       beq--   cr7,chkifuser1                                  ; Skip this if we are going to kernel...
+                       stw             r18,umwSpace(r28)                               ; Half-invalidate to force MapUserAddressWindow to reload SRs
+                       addi    r4,r28,USER_TIMER
+
+chkifuser1:    bl              EXT(timer_event)
+
+chkenax:       

 
 

-       

 #if DEBUG
 #if DEBUG

-                       lwz             r20,SAVact(r3)                          ; (TEST/DEBUG) Make sure our restore
-                       lwz             r21,PP_CPU_DATA(r10)            ; (TEST/DEBUG)         context is associated
-                       lwz             r21,CPU_ACTIVE_THREAD(r21)      ; (TEST/DEBUG)         with the current act.
-                       cmpwi   r21,0                                           ; (TEST/DEBUG)
-                       beq-    yeswereok                                       ; (TEST/DEBUG)
-                       lwz             r21,THREAD_TOP_ACT(r21)         ; (TEST/DEBUG)
-                       cmplw   r21,r20                                         ; (TEST/DEBUG)
-                       beq+    yeswereok                                       ; (TEST/DEBUG)
-                       BREAKPOINT_TRAP                                         ; (TEST/DEBUG)
+                       lwz             r20,SAVact(r27)                                 ; (TEST/DEBUG) Make sure our restore
+                       mfsprg  r21, 1                                                  ; (TEST/DEBUG) with the current act.
+                       cmpwi   r21,0                                                   ; (TEST/DEBUG)
+                       beq--   yeswereok                                               ; (TEST/DEBUG)
+                       cmplw   r21,r20                                                 ; (TEST/DEBUG)
+                       beq++   yeswereok                                               ; (TEST/DEBUG)
+
+                       lis             r0,hi16(Choke)                                  ; (TEST/DEBUG) Choke code
+                       ori             r0,r0,lo16(Choke)                               ; (TEST/DEBUG) and the rest
+                       mr              r21,r27                                                 ; (TEST/DEBUG) Save the savearea address
+                       li              r3,failContext                                  ; (TEST/DEBUG) Bad state code
+                       sc                                                                              ; (TEST/DEBUG) System ABEND

 
 yeswereok:
 #endif
        
 
 yeswereok:
 #endif
        

-                       rlwinm  r5,r3,0,0,19                            ; Round savearea down to page bndry
-                       rlwinm  r6,r6,0,1,31                            ; Mark savearea free
-                       lwz             r5,SACvrswap(r5)                        ; Get the conversion from virtual to real
-                       stw             r6,SAVflags(r3)                         ; Set savearea flags
-                       xor             r3,r3,r5                                        ; Flip to physical address
-                       b               EXT(exception_exit)                     ; We are all done now...
+                       mr              r3,r27                                                  ; Pass savearea back
+                       b               EXT(exception_exit)                             ; We are all done now...
+

 
 
 
 

+;
+;                      Null PPC call - performance testing, does absolutely nothing
+;
+
+                       .align  5
+                       
+                       .globl  EXT(ppcNull)
+                       
+LEXT(ppcNull)
+
+                       li              r3,-1                                                   ; Make sure we test no asts
+                       blr
+
+
+;
+;                      Instrumented null PPC call - performance testing, does absolutely nothing
+;                      Forces various timestamps to be returned.
+;
+
+                       .align  5
+                       
+                       .globl  EXT(ppcNullinst)
+                       
+LEXT(ppcNullinst)
+
+                       li              r3,-1                                                   ; Make sure we test no asts
+                       blr
+

 
 /*
  *                     Here's where we handle the fastpath stuff
 
 /*
  *                     Here's where we handle the fastpath stuff


@@ -1449,37 +1500,40 @@ yeswereok:
  *                             r25 = per_proc
  */
 
  *                             r25 = per_proc
  */
 

-fastpath:      cmplwi  cr3,r0,0x7FF1                           ; Is it CthreadSetSelfNumber?   
-                       bnelr-  cr3                                                     ; Not a fast path...
+                       .align  5
+
+fastpath:      cmplwi  cr3,r0,0x7FF5                           ; Is this a null fastpath?
+                       beq--   cr3,fastexutl                           ; Yes, bail fast...
+                       cmplwi  cr3,r0,0x7FF1                           ; Is it CthreadSetSelfNumber?   
+                       bnelr-- cr3                                                     ; Not a fast path...

 
 /*
  * void cthread_set_self(cproc_t p)
  *
 
 /*
  * void cthread_set_self(cproc_t p)
  *

- * set's thread state "user_value"
+ * Set's thread state "user_value".  In practice this is the thread-local-data-pointer (TLDP),
+ * though we do not interpret it.  This call is mostly used by 32-bit tasks, but we save all 64 bits
+ * in case a 64-bit task wants to use this facility.  They normally do not, because the 64-bit
+ * ABI reserves r13 for the TLDP.

  *
  * This op is invoked as follows:
  *     li r0, CthreadSetSelfNumber     // load the fast-trap number
  *     sc                              // invoke fast-trap
  *     blr
  *
  * This op is invoked as follows:
  *     li r0, CthreadSetSelfNumber     // load the fast-trap number
  *     sc                              // invoke fast-trap
  *     blr

- *

  */
 
 CthreadSetSelfNumber:
  */
 
 CthreadSetSelfNumber:

-
-                       lwz             r5,saver3(r4)                           /* Retrieve the self number */
-                       stw             r5,CTHREAD_SELF(r13)            /* Remember it */
-                       stw             r5,UAW(r25)                                     /* Prime the per_proc_info with it */
+            lwz     r3,saver3+0(r4)             /* get the TLDP passed in r3 */
+                       lwz             r5,saver3+4(r4)                         /* (all 64 bits, in case this is a 64-bit task) */
+                       stw             r3,CTHREAD_SELF+0(r13)          /* Remember it in the activation... */
+                       stw             r5,CTHREAD_SELF+4(r13)
+                       stw             r3,UAW+0(r25)               /* ...and in the per-proc */
+                       stw             r5,UAW+4(r25)

 
 
                        .globl  EXT(fastexit)
 EXT(fastexit):
 
 
                        .globl  EXT(fastexit)
 EXT(fastexit):

-                       lwz             r8,SAVflags(r4)                         /* Pick up the flags */
-                       rlwinm  r9,r4,0,0,19                            /* Round down to the base savearea block */
-                       rlwinm  r8,r8,0,1,31                            /* Clear the attached bit */
-                       lwz             r9,SACvrswap(r9)                        /* Get the conversion from virtual to real */
-                       stw             r8,SAVflags(r4)                         /* Set the flags */
-                       xor             r3,r4,r9                                        /* Switch savearea to physical addressing */
-                       b               EXT(exception_exit)                     /* Go back to the caller... */
+fastexutl:     mr              r3,r4                                           ; Pass back savearea
+                       b               EXT(exception_exit)                     ; Go back to the caller...

 
 
 /*
 
 
 /*


@@ -1489,26 +1543,23 @@ EXT(fastexit):
  *                     Otherwise we transfer to the assist code.
  */
  
  *                     Otherwise we transfer to the assist code.
  */
  

+                       .align  5
+                       

 checkassist:
 checkassist:

-                       lwz             r23,saveexception(r4)           /* Get the exception code */
-                       cmpi    cr0, r23, T_AST                         /* Check for T_AST trap */
-                       beqlr-                                                          /* Go handle it */
-
-                       lwz             r23,savesrr1(r4)                        /* Get the interrupted MSR */
-                       lwz             r24,ACT_MACT_BTS(r13)           /* Get the table start */
-                       rlwinm. r27,r23,0,MSR_PR_BIT,MSR_PR_BIT ; Are we in userland?
-                       rlwinm  r23,r23,0,SRR1_PRG_TRAP_BIT,SRR1_PRG_TRAP_BIT   ; See if this was actually a trap instruction
-                       beqlr-                                                          /* No assist in kernel mode... */
-                       mr.             r23,r23                                         ; Check for trap
-                       lwz             r27,savesrr0(r4)                        /* Get trapped address */
-                       beqlr-                                                          ; No assist if not trap instruction...
-
-checkassistBP:                                                                 /* Safe place to breakpoint */
-
-                       sub             r24,r27,r24                                     /* See how far into it we are */
-                       cmplwi  r24,BB_MAX_TRAP                         /* Do we fit in the list? */
-                       bgtlr-                                                          /* Nope, it's a regular trap... */
-                       b               EXT(atomic_switch_trap)         /* Go to the assist... */
+                       lwz             r0,saveexception(r4)            ; Get the exception code
+                       lwz             r23,savesrr1+4(r4)                      ; Get the interrupted MSR 
+                       lwz             r26,ACT_MACT_BEDA(r13)          ; Get Blue Box Descriptor Area
+                       mtcrf   0x18,r23                                        ; Check what SRR1 says
+                       lwz             r24,ACT_MACT_BTS(r13)           ; Get the table start 
+                       cmplwi  r0,T_AST                                        ; Check for T_AST trap 
+                       lwz             r27,savesrr0+4(r4)                      ; Get trapped address 
+                       crnand  cr1_eq,SRR1_PRG_TRAP_BIT,MSR_PR_BIT     ; We need both trap and user state
+                       sub             r24,r27,r24                                     ; See how far into it we are 
+                       cror    cr0_eq,cr0_eq,cr1_eq            ; Need to bail if AST or not trap or not user state
+                       cmplwi  cr1,r24,BB_MAX_TRAP                     ; Do we fit in the list? 
+                       cror    cr0_eq,cr0_eq,cr1_gt            ; Also leave it trap not in range
+                       btlr-   cr0_eq                                          ; No assist if AST or not trap or not user state or trap not in range
+                       b               EXT(atomic_switch_trap)         ; Go to the assist...

                        
 ;
 ;                      Virtual Machine Monitor 
                        
 ;
 ;                      Virtual Machine Monitor 


@@ -1518,6 +1569,8 @@ checkassistBP:                                                                    /* Safe place to breakpoint */
 ;                      and savearea respectivily.
 ;                      
 
 ;                      and savearea respectivily.
 ;                      
 

+                       .align  5
+

 exitFromVM:    mr              r30,r4                                          ; Get the savearea
                        mr              r3,r13                                          ; Get the activation
                        
 exitFromVM:    mr              r30,r4                                          ; Get the savearea
                        mr              r3,r13                                          ; Get the activation
                        


@@ -1527,13 +1580,14 @@ exitFromVM:     mr              r30,r4                                          ; Get the savearea
                        .globl  EXT(retFromVM)
 
 LEXT(retFromVM)
                        .globl  EXT(retFromVM)
 
 LEXT(retFromVM)

-                       mfsprg  r10,0                                           ; Restore the per_proc info
+                       mfsprg  r10,1                                           ; Get the current activation
+                       lwz             r10,ACT_PER_PROC(r10)           ; Get the per_proc block 

                        mr              r8,r3                                           ; Get the activation
                        mr              r8,r3                                           ; Get the activation

-                       lwz             r4,SAVprev(r30)                         ; Pick up the previous savearea
+                       lwz             r4,SAVprev+4(r30)                       ; Pick up the previous savearea

                        mr              r3,r30                                          ; Put savearea in proper register for common code
                        lwz             r11,SAVflags(r30)                       ; Get the flags of the current savearea
                        rlwinm  r11,r11,0,15,13                         ; Clear the syscall flag 
                        mr              r3,r30                                          ; Put savearea in proper register for common code
                        lwz             r11,SAVflags(r30)                       ; Get the flags of the current savearea
                        rlwinm  r11,r11,0,15,13                         ; Clear the syscall flag 

-                       lwz             r1,ACT_THREAD(r8)                       ; and the active thread
+                       mr              r1,r8

                        stw             r11,SAVflags(r3)                        ; Save back the flags (with reset stack cleared)
 
                        stw             r4,ACT_MACT_PCB(r8)                     ; Point to the previous savearea (or 0 if none)
                        stw             r11,SAVflags(r3)                        ; Save back the flags (with reset stack cleared)
 
                        stw             r4,ACT_MACT_PCB(r8)                     ; Point to the previous savearea (or 0 if none)


@@ -1544,61 +1598,66 @@ LEXT(retFromVM)
                        b               chkfac                                          ; Go end it all...
 
 
                        b               chkfac                                          ; Go end it all...
 
 

-#if    MACH_KDB
-/*
- *                     Here's where we jump into the debugger.  This is called from
- *                     either an MP signal from another processor, or a command-power NMI
- *                     on the main processor.
- *
- *                     Note that somewhere in our stack should be a return into the interrupt
- *                     handler.  If there isn't, we'll crash off the end of the stack, actually,
- *                     it'll just quietly return. hahahahaha.
- */
+;
+;                      chandler (note: not a candle maker or tallow merchant)
+;
+;                      Here is the system choke handler.  This is where the system goes
+;                      to die.
+;                      
+;                      We get here as a result of a T_CHOKE exception which is generated
+;                      by the Choke firmware call or by lowmem_vectors when it detects a
+;                      fatal error. Examples of where this may be used is when we detect
+;                      problems in low-level mapping chains, trashed savearea free chains,
+;                      or stack guardpage violations.
+;
+;                      Note that we can not set a back chain in the stack when we come
+;                      here because we are probably here because the chain was corrupt.
+;

 
 

-ENTRY(kdb_kintr, TAG_NO_FRAME_USED)
-       
-                       lis             r9,HIGH_ADDR(EXT(ihandler_ret)) /* Top part of interrupt return */
-                       lis             r10,HIGH_ADDR(EXT(intercept_ret))       /* Top part of intercept return */
-                       ori             r9,r9,LOW_ADDR(EXT(ihandler_ret))       /* Bottom part of interrupt return */
-                       ori             r10,r10,LOW_ADDR(EXT(intercept_ret))    /* Bottom part of intercept return */
-                       
-                       lwz             r8,0(r1)                                /* Get our caller's stack frame */

 
 

-srchrets:      mr.             r8,r8                                   /* Have we reached the end of our rope? */
-                       beqlr-                                                  /* Yeah, just bail... */
-                       lwz             r7,FM_LR_SAVE(r8)               /* The whoever called them */
-                       cmplw   cr0,r9,r7                               /* Was it the interrupt handler? */
-                       beq             srchfnd                                 /* Yeah... */
-                       lwz             r8,0(r8)                                /* Chain back to the previous frame */
-                       b               srchrets                                /* Ok, check again... */
+                       .align  5
+                       .globl EXT(chandler)
+LEXT(chandler)                                                                 ; Choke handler
+
+                       li              r31,0                                           ; Get a 0
+                       mfsprg  r25,1                                           ; Get the current activation
+                       lwz             r25,ACT_PER_PROC(r25)           ; Get the per_proc block 
+                       stw             r31,traceMask(0)                        ; Force tracing off right now
+               
+               
+               
+                       lwz             r1,PP_DEBSTACKPTR(r25)          ; Get debug stack pointer
+                       cmpwi   r1,-1                                           ; Are we already choking?
+                       bne             chokefirst                                      ; Nope...

                        
                        

-srchfnd:       stw             r10,FM_LR_SAVE(r8)              /* Modify return to come to us instead */
-                       blr                                                             /* Finish up and get back here... */
+chokespin:     addi    r31,r31,1                                       ; Spin and hope for an analyzer connection...                           
+                       addi    r31,r31,1                                       ; Spin and hope for an analyzer connection...                           
+                       addi    r31,r31,1                                       ; Spin and hope for an analyzer connection...                           
+                       addi    r31,r31,1                                       ; Spin and hope for an analyzer connection...                           
+                       addi    r31,r31,1                                       ; Spin and hope for an analyzer connection...                           
+                       addi    r31,r31,1                                       ; Spin and hope for an analyzer connection...                           
+                       b               chokespin                                       ; Spin and hope for an analyzer connection...

                        
                        

-/*
- *                     We come here when we've returned all the way to the interrupt handler.
- *                     That way we can enter the debugger with the registers and stack which
- *                     existed at the point of interruption.
- *
- *                     R3 points to the saved state at entry
- */
- 
- ENTRY(intercept_ret, TAG_NO_FRAME_USED)
-
-                       lis             r6,HIGH_ADDR(EXT(kdb_trap))     /* Get the top part of the KDB enter routine */
-                       mr              r5,r3                                   /* Move saved state to the correct parameter */
-                       ori             r6,r6,LOW_ADDR(EXT(kdb_trap))   /* Get the last part of the KDB enter routine */
-                       li              r4,0                                    /* Set a code of 0 */
-                       mr              r13,r3                                  /* Save the saved state pointer in a non-volatile */
-                       mtlr    r6                                              /* Set the routine address */
-                       li              r3,-1                                   /* Show we had an interrupt type */
-       
-                       blrl                                                    /* Go enter KDB */
+chokefirst:    li              r0,-1                                           ; Set choke value
+                       mr.             r1,r1                                           ; See if we are on debug stack yet
+                       lwz             r10,saver1+4(r4)                        ; 
+                       stw             r0,PP_DEBSTACKPTR(r25)          ; Show we are choking
+                       bne             chokestart                                      ; We are not on the debug stack yet...
+                       
+                       lwz             r2,PP_DEBSTACK_TOP_SS(r25)      ; Get debug stack top
+                       sub             r11,r2,r10                                      ; Get stack depth

 
 

-                       mr              r3,r13                                  /* Put the saved state where expected */
-                       b               EXT(ihandler_ret)               /* Go return from the interruption... */
+                       cmplwi  r11,KERNEL_STACK_SIZE-FM_SIZE-TRAP_SPACE_NEEDED ; Check if stack pointer is ok                  
+                       bgt             chokespin                                       ; Bad stack pointer or too little left, just die...

 
 

-#endif                 
+                       subi    r1,r10,FM_REDZONE                       ; Make a red zone
+
+chokestart:    li              r0,0                                            ; Get a zero
+                       stw             r0,FM_BACKPTR(r1)                       ; We now have terminated the back chain
+
+                       bl              EXT(SysChoked)                          ; Call the "C" phase of this
+                       b               chokespin                                       ; Should not be here so just go spin...
+                       

 
 #if VERIFYSAVE                 
 ;
 
 #if VERIFYSAVE                 
 ;


@@ -1606,63 +1665,26 @@ srchfnd:        stw             r10,FM_LR_SAVE(r8)              /* Modify return to come to us instead */
 ;
                
 versave:       
 ;
                
 versave:       

-

 #if 0
 #if 0

-;
-;                      Make sure that only the top FPU savearea is marked invalid
-;
-
-                       lis             r28,hi16(EXT(default_pset))             ; (TEST/DEBUG)
-                       lis             r27,hi16(EXT(DebugWork))                ; (TEST/DEBUG)
-                       ori             r28,r28,lo16(EXT(default_pset)) ; (TEST/DEBUG)
-                       ori             r27,r27,lo16(EXT(DebugWork))    ; (TEST/DEBUG)
-                       li              r20,0                                                   ; (TEST/DEBUG)
-                       lwz             r26,0(r27)                                              ; (TEST/DEBUG)
-                       lwz             r27,psthreadcnt(r28)                    ; (TEST/DEBUG)
-                       mr.             r26,r26                                                 ; (TEST/DEBUG)
-                       lwz             r28,psthreads(r28)                              ; (TEST/DEBUG)
-                       bnelr-                                                                  ; (TEST/DEBUG)
-                       
-fcknxtth:      mr.             r27,r27                                                 ; (TEST/DEBUG)
+                       lis             r22,hi16(EXT(DebugWork))                ; (TEST/DEBUG)
+                       ori             r22,r22,lo16(EXT(DebugWork))    ; (TEST/DEBUG)
+                       lwz             r23,0(r22)                                              ; (TEST/DEBUG)
+                       mr.             r23,r23                                                 ; (TEST/DEBUG)

                        beqlr-                                                                  ; (TEST/DEBUG)
                        beqlr-                                                                  ; (TEST/DEBUG)

-                       
-                       lwz             r26,THREAD_TOP_ACT(r28)                 ; (TEST/DEBUG)
-
-fckact:                mr.             r26,r26                                                 ; (TEST/DEBUG)
-                       bne+    fckact2                                                 ; (TEST/DEBUG)
-                       
-                       lwz             r28,THREAD_PSTHRN(r28)                  ; (TEST/DEBUG) Next in line
-                       subi    r27,r27,1                                               ; (TEST/DEBUG)
-                       b               fcknxtth                                                ; (TEST/DEBUG) 
-       
-fckact2:       lwz             r20,ACT_MACT_FPU(r26)                   ; (TEST/DEBUG) Get FPU chain
-                       mr.             r20,r20                                                 ; (TEST/DEBUG) Are there any?
-                       beq+    fcknact                                                 ; (TEST/DEBUG) No...
-                       
-fckact3:       lwz             r20,SAVprefp(r20)                               ; (TEST/DEBUG) Get next in list
-                       mr.             r20,r20                                                 ; (TEST/DEBUG) Check next savearea
-                       beq+    fcknact                                                 ; (TEST/DEBUG) No...
-                       
-                       lwz             r29,SAVlvlfp(r20)                               ; (TEST/DEBUG) Get the level
-
-                       cmplwi  r29,1                                                   ; (TEST/DEBUG) Is it invalid??
-                       bne+    fckact3                                                 ; (TEST/DEBUG) Nope...
-                       
-                       lis             r27,hi16(EXT(DebugWork))                ; (TEST/DEBUG)
-                       ori             r27,r27,lo16(EXT(DebugWork))    ; (TEST/DEBUG)
-                       stw             r27,0(r27)                                              ; (TEST/DEBUG)
-                       BREAKPOINT_TRAP                                                 ; (TEST/DEBUG)
-
-fcknact:       lwz             r26,ACT_LOWER(r26)                              ; (TEST/DEBUG) Next activation
-                       b               fckact                                                  ; (TEST/DEBUG)
+                       mfsprg  r20,1                                                   ; Get the current activation
+                       lwz             r20,ACT_PER_PROC(r20)                   ; Get the per_proc block 
+                       lwz             r21,pfAvailable(r20)                    ; (TEST/DEBUG)
+                       mr.             r21,r21                                                 ; (TEST/DEBUG)
+                       bnelr+                                                                  ; (TEST/DEBUG)
+                       
+                       stw             r22,0(r22)                                              ; (TEST/DEBUG) Lock out more checks
+                       BREAKPOINT_TRAP                                                 ; (TEST/DEBUG) Get into debugger

 #endif
 
 #endif
 

-#if 1
+#if 0
+               ;; This code is broken and migration will make the matter even worse

 ;
 ;

-;                      Make sure there are no circular links in the float chain
-;                      And that FP is marked busy in it.
-;                      And the only the top is marked invalid.
-;                      And that the owning PCB is correct.
+;                      Make sure that all savearea chains have the right type on them

 ;
 
                        lis             r28,hi16(EXT(default_pset))             ; (TEST/DEBUG)
 ;
 
                        lis             r28,hi16(EXT(default_pset))             ; (TEST/DEBUG)


@@ -1672,171 +1694,76 @@ fcknact:       lwz             r26,ACT_LOWER(r26)                              ; (TEST/DEBUG) Next activation
                        li              r20,0                                                   ; (TEST/DEBUG)
                        lwz             r26,0(r27)                                              ; (TEST/DEBUG)
                        lwz             r27,psthreadcnt(r28)                    ; (TEST/DEBUG)
                        li              r20,0                                                   ; (TEST/DEBUG)
                        lwz             r26,0(r27)                                              ; (TEST/DEBUG)
                        lwz             r27,psthreadcnt(r28)                    ; (TEST/DEBUG)

-                       mr.             r26,r26                                                 ; (TEST/DEBUG)
+                       mr.             r26,r26                                                 ; (TEST/DEBUG) Have we locked the test out?

                        lwz             r28,psthreads(r28)                              ; (TEST/DEBUG)
                        lwz             r28,psthreads(r28)                              ; (TEST/DEBUG)

-                       bnelr-                                                                  ; (TEST/DEBUG)
-                       
-fcknxtth:      mr.             r27,r27                                                 ; (TEST/DEBUG)
-                       beqlr-                                                                  ; (TEST/DEBUG)
+                       mflr    r31                                                             ; (TEST/DEBUG) Save return
+                       bnelr-                                                                  ; (TEST/DEBUG) Test already triggered, skip...
+                       b               fckgo                                                   ; (TEST/DEBUG) Join up...

                        
                        

-                       lwz             r26,THREAD_TOP_ACT(r28)                 ; (TEST/DEBUG)
+fcknext:       mr.             r27,r27                                                 ; (TEST/DEBUG) Any more threads?
+                       bne+    fckxxx                                                  ; (TEST/DEBUG) Yes...

 
 

-fckact:                mr.             r26,r26                                                 ; (TEST/DEBUG)
-                       bne+    fckact2                                                 ; (TEST/DEBUG)
+                       mtlr    r31                                                             ; (TEST/DEBUG) Restore return
+                       blr                                                                             ; (TEST/DEBUG) Leave...

                        
                        

-                       lwz             r28,THREAD_PSTHRN(r28)                  ; (TEST/DEBUG) Next in line
-                       subi    r27,r27,1                                               ; (TEST/DEBUG)
-                       b               fcknxtth                                                ; (TEST/DEBUG) 
-       
-fckact2:       lwz             r20,ACT_MACT_FPU(r26)                   ; (TEST/DEBUG) Get FPU chain
-                       li              r29,1                                                   ; (TEST/DEBUG)
-                       li              r22,0                                                   ; (TEST/DEBUG)
+fckxxx:                lwz             r28,THREAD_PSTHRN(r28)                  ; (TEST/DEBUG) Get next thread

 
 

-fckact3:       mr.             r20,r20                                                 ; (TEST/DEBUG) Are there any?
-                       beq+    fckact5                                                 ; (TEST/DEBUG) No...
+fckgo:         subi    r27,r27,1                                               ; (TEST/DEBUG) Decrement thread count
+                       lwz             r24,THREAD_TOP_ACT(r28)                 ; (TEST/DEBUG) Get activation for the thread
+                       lwz             r20,ACT_MACT_PCB(r24)                   ; (TEST/DEBUG) Get the normal context
+                       li              r21,SAVgeneral                                  ; (TEST/DEBUG) Make sure this is all general context
+                       bl              versavetype                                             ; (TEST/DEBUG) Check the chain

                        
                        

-                       addi    r22,r22,1                                               ; (TEST/DEBUG) Count chain depth
+                       lwz             r20,facctx+FPUsave(r24)                 ; (TEST/DEBUG) Get regular floating point
+                       li              r21,SAVfloat                                    ; (TEST/DEBUG) Make sure this is all floating point
+                       bl              versavetype                                             ; (TEST/DEBUG) Check the chain                  

                        
                        

-                       lwz             r21,SAVflags(r20)                               ; (TEST/DEBUG) Get the flags
-                       rlwinm. r21,r21,0,1,1                                   ; (TEST/DEBUG) FP busy?
-                       bne+    fckact3a                                                ; (TEST/DEBUG) Yeah...
-                       lis             r27,hi16(EXT(DebugWork))                ; (TEST/DEBUG)
-                       ori             r27,r27,lo16(EXT(DebugWork))    ; (TEST/DEBUG)
-                       stw             r27,0(r27)                                              ; (TEST/DEBUG)
-                       BREAKPOINT_TRAP                                                 ; (TEST/DEBUG) Die
-                       
-fckact3a:      cmplwi  r22,1                                                   ; (TEST/DEBUG) At first SA?
-                       beq+    fckact3b                                                ; (TEST/DEBUG) Yeah, invalid is ok...
-                       lwz             r21,SAVlvlfp(r20)                               ; (TEST/DEBUG) Get level
-                       cmplwi  r21,1                                                   ; (TEST/DEBUG) Is it invalid?
-                       bne+    fckact3b                                                ; (TEST/DEBUG) Nope, it is ok...
-                       lis             r27,hi16(EXT(DebugWork))                ; (TEST/DEBUG)
-                       ori             r27,r27,lo16(EXT(DebugWork))    ; (TEST/DEBUG)
-                       stw             r27,0(r27)                                              ; (TEST/DEBUG)
-                       BREAKPOINT_TRAP                                                 ; (TEST/DEBUG) Die
+                       lwz             r20,facctx+VMXsave(r24)                 ; (TEST/DEBUG) Get regular vector point
+                       li              r21,SAVvector                                   ; (TEST/DEBUG) Make sure this is all vector
+                       bl              versavetype                                             ; (TEST/DEBUG) Check the chain                  

                        
                        

-fckact3b:      lwz             r21,SAVact(r20)                                 ; (TEST/DEBUG) Get the owner
-                       cmplw   r21,r26                                                 ; (TEST/DEBUG) Correct activation?
-                       beq+    fckact3c                                                ; (TEST/DEBUG) Yup...
-                       lis             r27,hi16(EXT(DebugWork))                ; (TEST/DEBUG)
-                       ori             r27,r27,lo16(EXT(DebugWork))    ; (TEST/DEBUG)
-                       stw             r27,0(r27)                                              ; (TEST/DEBUG)
-                       BREAKPOINT_TRAP                                                 ; (TEST/DEBUG) Die
-
-fckact3c:                                                                                      ; (TEST/DEBUG)
-                       lbz             r21,SAVflags+3(r20)                             ; (TEST/DEBUG) Pick up the test byte
-                       mr.             r21,r21                                                 ; (TEST/DEBUG) marked?
-                       beq+    fckact4                                                 ; (TEST/DEBUG) No, good...
+                       lwz             r29,vmmControl(r24)                             ; (TEST/DEBUG) Get the virtual machine control blocks
+                       mr.             r29,r29                                                 ; (TEST/DEBUG) Are there any?
+                       beq+    fcknext                                                 ; (TEST/DEBUG) Nope, next thread...

                        
                        

-                       lis             r27,hi16(EXT(DebugWork))                ; (TEST/DEBUG)
-                       ori             r27,r27,lo16(EXT(DebugWork))    ; (TEST/DEBUG)
-                       stw             r27,0(r27)                                              ; (TEST/DEBUG)
-                       BREAKPOINT_TRAP                                                 ; (TEST/DEBUG)
+                       li              r22,kVmmMaxContextsPerThread    ; (TEST/DEBUG) Get the number of control blocks 
+                       subi    r29,r29,vmmCEntrySize                   ; (TEST/DEBUG) Get running start        

                        
                        

-fckact4:       stb             r29,SAVflags+3(r20)                             ; (TEST/DEBUG) Set the test byte
-                       lwz             r20,SAVprefp(r20)                               ; (TEST/DEBUG) Next in list
-                       b               fckact3                                                 ; (TEST/DEBUG) Try it...
-
-fckact5:       lwz             r20,ACT_MACT_FPU(r26)                   ; (TEST/DEBUG) Get FPU chain
-                       li              r29,0                                                   ; (TEST/DEBUG)
-
-fckact6:       mr.             r20,r20                                                 ; (TEST/DEBUG) Are there any?
-                       beq+    fcknact                                                 ; (TEST/DEBUG) No...
+fcknvmm:       subi    r22,r22,1                                               ; (TEST/DEBUG) Do all of them
+                       mr.             r22,r22                                                 ; (TEST/DEBUG) Are we all done?
+                       addi    r29,r29,vmmCEntrySize                   ; (TEST/DEBUG) Get the next entry
+                       blt-    fcknext                                                 ; (TEST/DEBUG) Yes, check next thread...

                        
                        

-                       stb             r29,SAVflags+3(r20)                             ; (TEST/DEBUG) Clear the test byte
-                       lwz             r20,SAVprefp(r20)                               ; (TEST/DEBUG) Next in list
-                       b               fckact6                                                 ; (TEST/DEBUG) Try it...
+                       lwz             r23,vmmFlags(r29)                               ; (TEST/DEBUG) Get entry flags
+                       rlwinm. r23,r23,0,0,0                                   ; (TEST/DEBUG) Is this in use?
+                       beq+    fcknvmm                                                 ; (TEST/DEBUG) Not in use...

                        
                        

-fcknact:       lwz             r26,ACT_LOWER(r26)                              ; (TEST/DEBUG) Next activation
-                       b               fckact                                                  ; (TEST/DEBUG)
-#endif
-
-
-#if 0
-;
-;                      Make sure in use count matches found savearea.  This is
-;                      not always accurate.  There is a variable "fuzz" factor in count.
-
-                       lis             r28,hi16(EXT(default_pset))             ; (TEST/DEBUG)
-                       lis             r27,hi16(EXT(DebugWork))                ; (TEST/DEBUG)
-                       ori             r28,r28,lo16(EXT(default_pset)) ; (TEST/DEBUG)
-                       ori             r27,r27,lo16(EXT(DebugWork))    ; (TEST/DEBUG)
-                       li              r20,0                                                   ; (TEST/DEBUG)
-                       lwz             r26,0(r27)                                              ; (TEST/DEBUG)
-                       lwz             r27,psthreadcnt(r28)                    ; (TEST/DEBUG)
-                       mr.             r26,r26                                                 ; (TEST/DEBUG)
-                       lwz             r28,psthreads(r28)                              ; (TEST/DEBUG)
-                       bnelr-                                                                  ; (TEST/DEBUG)
-                       
-cknxtth:       mr.             r27,r27                                                 ; (TEST/DEBUG)
-                       beq-    cktotal                                                 ; (TEST/DEBUG)
-                       
-                       lwz             r26,THREAD_TOP_ACT(r28)                 ; (TEST/DEBUG)
-
-ckact:         mr.             r26,r26                                                 ; (TEST/DEBUG)
-                       bne+    ckact2                                                  ; (TEST/DEBUG)
-                       
-                       lwz             r28,THREAD_PSTHRN(r28)                  ; (TEST/DEBUG) Next in line
-                       subi    r27,r27,1                                               ; (TEST/DEBUG)
-                       b               cknxtth                                                 ; (TEST/DEBUG) 
-                       
-ckact2:                lwz             r29,ACT_MACT_PCB(r26)                   ; (TEST/DEBUG)
-                       
-cknorm:                mr.             r29,r29                                                 ; (TEST/DEBUG)
-                       beq-    cknormd                                                 ; (TEST/DEBUG)
-                       
-                       addi    r20,r20,1                                               ; (TEST/DEBUG) Count normal savearea
+                       lwz             r20,vmmFacCtx+FPUsave(r29)              ; (TEST/DEBUG) Get regular floating point
+                       li              r21,SAVfloat                                    ; (TEST/DEBUG) Make sure this is all floating point
+                       bl              versavetype                                             ; (TEST/DEBUG) Check the chain                  

                        
                        

-                       lwz             r29,SAVprev(r29)                                ; (TEST/DEBUG)
-                       b               cknorm                                                  ; (TEST/DEBUG)
+                       lwz             r20,vmmFacCtx+VMXsave(r29)              ; (TEST/DEBUG) Get regular vector point
+                       li              r21,SAVvector                                   ; (TEST/DEBUG) Make sure this is all vector
+                       bl              versavetype                                             ; (TEST/DEBUG) Check the chain                  
+                       b               fcknvmm                                                 ; (TEST/DEBUG) Get then vmm block...

                        
                        

-cknormd:       lwz             r29,ACT_MACT_FPU(r26)                   ; (TEST/DEBUG)
-
-ckfpu:         mr.             r29,r29                                                 ; (TEST/DEBUG)
-                       beq-    ckfpud                                                  ; (TEST/DEBUG)
-                       
-                       lwz             r21,SAVflags(r29)                               ; (TEST/DEBUG)
-                       rlwinm. r21,r21,0,0,0                                   ; (TEST/DEBUG) See if already counted
-                       bne-    cknfpu                                                  ; (TEST/DEBUG)
-                       
-                       addi    r20,r20,1                                               ; (TEST/DEBUG) Count fpu savearea
-                       
-cknfpu:                lwz             r29,SAVprefp(r29)                               ; (TEST/DEBUG)
-                       b               ckfpu                                                   ; (TEST/DEBUG)
-                       
-ckfpud:                lwz             r29,ACT_MACT_VMX(r26)                   ; (TEST/DEBUG)
-
-ckvmx:         mr.             r29,r29                                                 ; (TEST/DEBUG)
-                       beq-    ckvmxd                                                  ; (TEST/DEBUG)
+versavetype:
+                       mr.             r20,r20                                                 ; (TEST/DEBUG) Chain done?
+                       beqlr-                                                                  ; (TEST/DEBUG) Yes...

                        
                        

-                       lwz             r21,SAVflags(r29)                               ; (TEST/DEBUG)
-                       rlwinm. r21,r21,0,0,1                                   ; (TEST/DEBUG) See if already counted
-                       bne-    cknvmx                                                  ; (TEST/DEBUG)
+                       lwz             r23,SAVflags(r20)                               ; (TEST/DEBUG) Get the flags
+                       rlwinm  r23,r23,24,24,31                                ; (TEST/DEBUG) Position it
+                       cmplw   r23,r21                                                 ; (TEST/DEBUG) Are we the correct type?
+                       beq+    versvok                                                 ; (TEST/DEBUG) This one is ok...

                        
                        

-                       addi    r20,r20,1                                               ; (TEST/DEBUG) Count vector savearea
+                       lis             r22,hi16(EXT(DebugWork))                ; (TEST/DEBUG)
+                       ori             r22,r22,lo16(EXT(DebugWork))    ; (TEST/DEBUG)
+                       stw             r22,0(r22)                                              ; (TEST/DEBUG) Lock out more checks
+                       BREAKPOINT_TRAP                                                 ; (TEST/DEBUG) Get into debugger

                        
                        

-cknvmx:                lwz             r29,SAVprevec(r29)                              ; (TEST/DEBUG)
-                       b               ckvmx                                                   ; (TEST/DEBUG)
-                       
-ckvmxd:                lwz             r26,ACT_LOWER(r26)                              ; (TEST/DEBUG) Next activation
-                       b               ckact                                                   ; (TEST/DEBUG)
+versvok:       lwz             r20,SAVprev+4(r20)                              ; (TEST/DEBUG) Get the previous one
+                       b               versavetype                                             ; (TEST/DEBUG) Go check its type...
+#endif

 
 

-cktotal:       lis             r28,hi16(EXT(saveanchor))               ; (TEST/DEBUG)
-                       lis             r27,hi16(EXT(real_ncpus))               ; (TEST/DEBUG)
-                       ori             r28,r28,lo16(EXT(saveanchor))   ; (TEST/DEBUG)
-                       ori             r27,r27,lo16(EXT(real_ncpus))   ; (TEST/DEBUG)

 
 

-                       lwz             r21,SVinuse(r28)                                ; (TEST/DEBUG)
-                       lwz             r27,0(r27)                                              ; (TEST/DEBUG) Get the number of CPUs
-                       sub.    r29,r21,r20                                             ; (TEST/DEBUG) Get number accounted for
-                       blt-    badsave                                                 ; (TEST/DEBUG) Have too many in use...
-                       sub             r26,r29,r27                                             ; (TEST/DEBUG) Should be 1 unaccounted for for each processor
-                       cmpwi   r26,10                                                  ; (TEST/DEBUG) Allow a 10 area slop factor
-                       bltlr+                                                                  ; (TEST/DEBUG)
-                       
-badsave:       lis             r27,hi16(EXT(DebugWork))                ; (TEST/DEBUG)
-                       ori             r27,r27,lo16(EXT(DebugWork))    ; (TEST/DEBUG)
-                       stw             r27,0(r27)                                              ; (TEST/DEBUG)
-                       BREAKPOINT_TRAP                                                 ; (TEST/DEBUG)
-#endif

 #endif 
 #endif