/* * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * The contents of this file constitute Original Code as defined in and * are subject to the Apple Public Source License Version 1.1 (the * "License"). You may not use this file except in compliance with the * License. Please obtain a copy of the License at * http://www.apple.com/publicsource and read it before using this file. * * This Original Code and all software distributed under the License are * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the * License for the specific language governing rights and limitations * under the License. * * @APPLE_LICENSE_HEADER_END@ */ /* * @OSF_COPYRIGHT@ */ /* Low level routines dealing with exception entry and exit. * There are various types of exception: * * Interrupt, trap, system call and debugger entry. Each has it's own * handler since the state save routine is different for each. The * code is very similar (a lot of cut and paste). * * The code for the FPU disabled handler (lazy fpu) is in cswtch.s */ #include <debug.h> #include <mach_assert.h> #include <mach/exception_types.h> #include <mach/ppc/vm_param.h> #include <assym.s> #include <ppc/asm.h> #include <ppc/proc_reg.h> #include <ppc/trap.h> #include <ppc/exception.h> #include <ppc/spl.h> #define VERIFYSAVE 0 #define FPVECDBG 0 /* * thandler(type) * * ENTRY: VM switched ON * Interrupts OFF * R3 contains exception code * R4 points to the saved context (virtual address) * Everything is saved in savearea */ /* * If pcb.ksp == 0 then the kernel stack is already busy, * we save ppc_saved state below the current 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 * 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 * hundred bytes for the space needed by the C (which may be less but * may be much more). We're trying to catch kernel stack overflows :-) */ #define TRAP_SPACE_NEEDED FM_REDZONE+(2*FM_SIZE)+256 #endif /* DEBUG */ .text ENTRY(thandler, TAG_NO_FRAME_USED) /* What tag should this have?! */ mfsprg r25,0 /* Get the per_proc */ 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 */ #if VERIFYSAVE bl versave ; (TEST/DEBUG) #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 */ /* 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 */ .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 */ stw r0,ACT_MACT_KSP(r13) /* Show that we have taken the stack */ .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 */ #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 */ #endif /* DEBUG */ /* 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) */ lwz r3,saveexception(r4) /* 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 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) 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) cmpi cr2,r3,T_PREEMPT ; Is this a preemption? 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 */ 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... /* 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 bl EXT(trap) /* * 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. * */ thread_return: 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) */ #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) */ 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... */ /* * shandler(type) * * ENTRY: VM switched ON * Interrupts OFF * R3 contains exception code * R4 points to the saved context (virtual address) * Everything is saved in savearea */ /* * If pcb.ksp == 0 then the kernel stack is already busy, * this is an error - jump to the debugger entry * * otherwise depending upon the type of * syscall, look it up in the kernel table * or pass it to the server. * * on return, we do the reverse, the state is popped from the pcb * and pcb.ksp is set to the top of stack. */ /* * NOTE: * mach system calls are negative * BSD system calls are low positive * PPC-only system calls are in the range 0x6xxx * 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... 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 ; 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 */ #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? */ #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 */ #if VERIFYSAVE bl versave ; (TEST/DEBUG) #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 */ #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 */ #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 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... */ #endif .L_call_server_syscall_exception: li r3,EXC_SYSCALL /* doexception(EXC_SYSCALL, num, 1) */ .L_call_server_exception: mr r4,r0 /* Set syscall selector */ 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... */ .L_notify_interrupt_syscall: lwz r3,saver3(r30) ; Get the new PC address to pass in bl EXT(syscall_notify_interrupt) b .L_syscall_return ; ; Handle PPC-only system call interface ; These are called with interruptions disabled ; 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 ; be calling diagnostic code we will not enable. ; ; Also, the callee is responsible for finding any parameters ; in the savearea/pcb. It also must set saver3 with any return ; code before returning. ; ; There are 3 possible return codes: ; 0 the call is disabled or something, we treat this like it was bogus ; + the call finished ok, check for AST ; - the call finished ok, do not check for AST ; ; Note: the last option is intended for special diagnostics calls that ; want the thread to return and execute before checking for preemption. ; 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... lwzx r11,r10,r11 ; Get function address ; ; Note: make sure we do not change the savearea in R30 to ; a different register without checking. Some of the PPCcalls ; 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 beq- .L_call_server_syscall_exception ; Disabled call... blrl ; Call it .globl EXT(ppcscret) LEXT(ppcscret) 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.... blt+ .L_thread_syscall_return ; Return, but no ASTs.... lwz r0,saver0(r30) ; Restore the system call number b .L_call_server_syscall_exception ; Go to common exit... /* Once here, we know that the syscall was -ve * we should still have r1=ksp, * r16 = pointer to current thread, * r13 = pointer to top activation, * 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 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 */ /* 'standard' syscall returns here - INTERRUPTS ARE STILL ON */ /* r3 contains value that we're going to return to the user */ /* * Ok, return from C function, ARG0 = return value * * 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 . */ /* 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 * 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, * r30 should point to the current pcb */ /* 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: 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 */ mfsprg r10,0 /* Get the per_processor block */ /* 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 /* 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 */ #if DEBUG /* debug assert - make sure that we're not returning to kernel */ lwz r3,savesrr1(r30) andi. r3,r3,MASK(MSR_PR) bne+ 0f /* returning to user level, check */ BREAKPOINT_TRAP 0: #endif /* DEBUG */ li r3, 0 li r4, AST_ALL li r5, 1 bl EXT(ast_taken) b .L_thread_syscall_ret_check_ast /* 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). * * In particular for us, * we still have r31 points to the current thread, * r30 points to the current pcb */ .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: /* 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... /* * thread_exception_return() * * Return to user mode directly from within a system call. */ ENTRY(thread_exception_return, TAG_NO_FRAME_USED) .L_thread_exc_ret_check_ast: mfmsr r3 /* Get the MSR */ rlwinm r3,r3,0,MSR_EE_BIT+1,MSR_EE_BIT-1 /* Clear 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 can invoke ast_taken(), because it can just borrow our caller's 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) cmpi cr0,r4, 0 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 */ li r3,0 li r4,AST_ALL li r5,1 bl EXT(ast_taken) 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: lwz r31,PP_CPU_DATA(r10) lwz r31,CPU_ACTIVE_THREAD(r31) lwz r30,THREAD_TOP_ACT(r31) lwz r30,ACT_MACT_PCB(r30) 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 */ lwz r3,savesrr1(r30) andi. r3,r3,MASK(MSR_PR) bne+ ret_user2 ; We are ok... BREAKPOINT_TRAP ret_user2: #endif /* DEBUG */ /* If the MSR_SYSCALL_MASK 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! */ 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 ; ; 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... 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... 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 b thread_return ; Go let em try to execute, hah! /* * ihandler(type) * * ENTRY: VM switched ON * Interrupts OFF * R3 contains exception code * R4 points to the saved context (virtual address) * Everything is saved in savearea * */ ENTRY(ihandler, TAG_NO_FRAME_USED) /* * 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. */ 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... */ /* 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... */ .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 */ /* * 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. */ ihsetback: subi r1,r1,FM_SIZE /* Make a new frame */ stw r9,FM_BACKPTR(r1) /* point back to previous stackptr */ #if VERIFYSAVE bl versave ; (TEST/DEBUG) #endif #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 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 */ #endif /* DEBUG */ lwz r5,savedsisr(r4) /* Get the DSISR */ lwz r6,savedar(r4) /* Get the DAR */ bl EXT(interrupt) /* interrupt() returns a pointer to the saved state in r3 * * Ok, back from C. Disable interrupts while we restore things */ .globl EXT(ihandler_ret) 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 */ 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... */ /* We're the last frame on the stack. Restore istackptr to empty state. * * Check for ASTs if one of the below is true: * 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... */ 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: /* * There is a pending AST. Massage things to make it look like * we took a trap and jump into the trap handler. To do this * we essentially pretend to return from the interrupt but * at the last minute jump into the trap handler with an AST * 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_no_int_ast: mr r3,r4 ; Get into the right register for common code .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 ; ; This section is common to all exception exits. It throws away vector ; and floating point saveareas as the exception level of a thread is ; exited. ; ; It also enables the facility if its context is live ; Requires: ; R3 = Savearea to be released (virtual) ; R4 = New top of savearea stack (could be 0) ; 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... #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 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 #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) #endif b chkvec ; Go check out the vector facility... chkfpfree: li r0,0 ; Clear a register lwz r24,ACT_MACT_FPU(r8) ; Get the floating point save area bne- cr1,chkfpnfr ; Not our facility, do not clear... stw r0,PP_FPU_THREAD(r10) ; Clear floating point owner chkfpnfr: #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 mr. r24,r24 ; Do we even have a savearea? beq+ chkvec ; Nope... #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 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... 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 #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 ; ; Check out vector stuff (and translate savearea to physical for exit) ; 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 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: #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 mr. r24,r24 ; Do we even have a savearea? beq+ setena ; Nope... #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... 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 vectoplvl: lwz r19,SAVflags(r24) ; Get the savearea flags #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... #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 #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) 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... /* * Here's where we handle the fastpath stuff * We'll do what we can here because registers are already * loaded and it will be less confusing that moving them around. * If we need to though, we'll branch off somewhere's else. * * Registers when we get here: * * r0 = syscall number * r4 = savearea/pcb * r13 = activation * r14 = previous savearea (if any) * r16 = thread * r25 = per_proc */ fastpath: cmplwi cr3,r0,0x7FF1 ; Is it CthreadSetSelfNumber? bnelr- cr3 ; Not a fast path... /* * void cthread_set_self(cproc_t p) * * set's thread state "user_value" * * This op is invoked as follows: * li r0, CthreadSetSelfNumber // load the fast-trap number * sc // invoke fast-trap * blr * */ 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 */ .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... */ /* * Here's where we check for a hit on the Blue Box Assist * Most registers are non-volatile, so be careful here. If we don't * recognize the trap instruction we go back for regular processing. * Otherwise we transfer to the assist code. */ 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... */ ; ; Virtual Machine Monitor ; Here is where we exit from the emulated context ; Note that most registers get trashed here ; R3 and R30 are preserved across the call and hold the activation ; and savearea respectivily. ; exitFromVM: mr r30,r4 ; Get the savearea mr r3,r13 ; Get the activation b EXT(vmm_exit) ; Do it to it .align 5 .globl EXT(retFromVM) LEXT(retFromVM) mfsprg r10,0 ; Restore the per_proc info mr r8,r3 ; Get the activation lwz r4,SAVprev(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 lwz r1,ACT_THREAD(r8) ; and the active thread 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) 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... #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. */ 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... */ srchfnd: stw r10,FM_LR_SAVE(r8) /* Modify return to come to us instead */ blr /* Finish up and get back here... */ /* * 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 */ mr r3,r13 /* Put the saved state where expected */ b EXT(ihandler_ret) /* Go return from the interruption... */ #endif #if VERIFYSAVE ; ; Savearea chain verification ; versave: #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) 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) #endif #if 1 ; ; 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. ; 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) 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 li r29,1 ; (TEST/DEBUG) li r22,0 ; (TEST/DEBUG) fckact3: mr. r20,r20 ; (TEST/DEBUG) Are there any? beq+ fckact5 ; (TEST/DEBUG) No... addi r22,r22,1 ; (TEST/DEBUG) Count chain depth 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 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... 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) 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... 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... 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 r29,SAVprev(r29) ; (TEST/DEBUG) b cknorm ; (TEST/DEBUG) 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) lwz r21,SAVflags(r29) ; (TEST/DEBUG) rlwinm. r21,r21,0,0,1 ; (TEST/DEBUG) See if already counted bne- cknvmx ; (TEST/DEBUG) addi r20,r20,1 ; (TEST/DEBUG) Count vector savearea 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) 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