X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/9bccf70c0258c7cac2dcb80011b2a964d884c552..0c530ab8987f0ae6a1a3d9284f40182b88852816:/osfmk/ppc/hw_exception.s diff --git a/osfmk/ppc/hw_exception.s b/osfmk/ppc/hw_exception.s index f0296682b..4c66797de 100644 --- 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@ * @@ -36,6 +36,7 @@ #include #include #include +#include #include #include @@ -45,12 +46,13 @@ #include #include #include -#include #define VERIFYSAVE 0 #define FPVECDBG 0 - +#define FPFLOOD 0 +#define INSTRUMENT 0 + /* * thandler(type) * @@ -90,21 +92,21 @@ .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 cmpwi cr0,r1,0 ; Are we on interrupt stack? - lwz r6,PP_ACTIVE_THREAD(r25) ; Get the pointer to the currently active thread + mr r6,r13 beq- cr0,EXT(ihandler) ; If on interrupt stack, treat this as interrupt... - lwz r13,THREAD_TOP_ACT(r6) ; Point to the active activation 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(r4) ; Queue the new save area in the front + stw r8,SAVprev+4(r4) ; Queue the new save area in the front #if VERIFYSAVE bl versave ; (TEST/DEBUG) @@ -113,16 +115,17 @@ LEXT(thandler) ; Trap handler 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(r4) ; Get the stack at interrupt time + lwz r26,saver1+4(r4) ; Get the stack at interrupt time bne+ cr1,.L_kstackfree ; We are not on kernel stack yet... subi r1,r26,FM_REDZONE ; Make a red zone on interrupt time kernel stack .L_kstackfree: - lwz r7,savesrr1(r4) ; Pick up the entry MSR + 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 @@ -130,12 +133,13 @@ LEXT(thandler) ; Trap handler .L_state_on_kstack: lwz r9,savevrsave(r4) ; Get the VRSAVE register - rlwinm. r6,r7,0,MSR_VEC_BIT,MSR_VEC_BIT ; Was vector on? + 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... + bgt-- cr2,kernelStackBad ; Kernel stack is bogus... kernelStackNotBad: ; Vector was off - beq+ tvecoff ; Vector off, do not save vrsave... + 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 @@ -145,21 +149,25 @@ tvecoff: stw r26,FM_BACKPTR(r1) ; Link back to the previous frame * 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 + 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 */ + mr r30,r4 + lwz r3,SAVtime+4(r4) + addi r4,r13,SYSTEM_TIMER + bl EXT(timer_event) /* 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 + 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 @@ -169,15 +177,20 @@ tvecoff: stw r26,FM_BACKPTR(r1) ; Link back to the previous frame 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) + 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? + + 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) - 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 ; Do not turn on interrupts for T_PREEMPT + 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 @@ -186,14 +199,19 @@ tvecoff: stw r26,FM_BACKPTR(r1) ; Link back to the previous frame .L_call_trap: +#if FPFLOOD + stfd f31,emfp31(r25) ; (TEST/DEBUG) +#endif + bl EXT(trap) + lis r10,hi16(MASK(MSR_VEC)) ; Get the vector enable mfmsr r7 ; Get the MSR - rlwinm r7,r7,0,MSR_FP_BIT+1,MSR_FP_BIT-1 ; Force floating point off - rlwinm r7,r7,0,MSR_VEC_BIT+1,MSR_VEC_BIT-1 ; Force vectors off - rlwinm r7,r7,0,MSR_EE_BIT+1,MSR_EE_BIT-1 ; Clear the interrupt enable mask + 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 r10,0 ; Restore the per_proc info + mfsprg r8,1 ; Get the current activation + lwz r10,ACT_PER_PROC(r8) ; Get the per_proc block /* * 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 @@ -201,21 +219,21 @@ tvecoff: stw r26,FM_BACKPTR(r1) ; Link back to the previous frame */ thread_return: - lwz r4,SAVprev(r3) ; Pick up the previous savearea lwz r11,SAVflags(r3) ; Get the flags of the current savearea - lwz r8,savesrr1(r3) ; Get the MSR we are going to + 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 - lwz r1,PP_ACTIVE_THREAD(r10) ; Get the active thread - rlwinm. r8,r8,0,MSR_PR_BIT,MSR_PR_BIT ; Are we going to the user? - mfsprg r8,1 ; Get the current activation + 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 - beq- chkfac ; We are not leaving the kernel yet... + 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... @@ -238,6 +256,12 @@ kernelStackBad: 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 + /* * shandler(type) @@ -273,34 +297,44 @@ kernelStackBad: .globl EXT(shandler) LEXT(shandler) ; System call handler - mfsprg r25,0 ; Get the per proc area - lwz r0,saver0(r4) ; Get the original syscall number + 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 r7,savesrr1(r4) ; Get the SRR1 value - beq- EXT(ihandler) ; On interrupt stack, not allowed... 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? - lwz r16,PP_ACTIVE_THREAD(r25) ; Get the thread pointer - mfsprg r13,1 ; Pick up the active thread + mr r16,r13 - beq+ svecoff ; Vector off, do not save vrsave... + 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 ; svecoff: lwz r6,ACT_MACT_SPF(r13) ; Pick up activation special flags - mtcrf 0x41,r6 ; Check special flags + mtcrf 0x40,r6 ; Check special flags + mtcrf 0x01,r6 ; Check special flags crmove cr6_eq,runningVMbit ; Remember if we are in VMM - bf+ bbNoMachSCbit,noassist ; Take branch if SCs are not redirected + 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... + beql fastpath ; We think it is a fastpath... lwz r1,ACT_MACT_KSP(r13) ; Get the kernel stack pointer #if DEBUG @@ -310,62 +344,68 @@ noassist: cmplwi r15,0x7000 ; Do we have a fast path trap? #endif /* DEBUG */ 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(r4) ; Queue the new save area in the front + 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 bl versave ; (TEST/DEBUG) #endif + lwz r15,saver1+4(r4) ; Grab interrupt time stack 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 stack frame backwards + + lwz r3,SAVtime+4(r30) + addi r4,r13,SYSTEM_TIMER + bl EXT(timer_event) #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 + 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 */ - mfmsr r11 ; Get the MSR + mr r4,r30 + 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 - 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 + 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-- cr6,exitFromVM ; It is time to exit from alternate context... - beq- ppcscall ; Call the ppc-only system call handler... + beq-- ppcscall ; Call the ppc-only system call handler... + mr. r0,r0 ; What kind is it? mtmsr r11 ; Enable interruptions - lwz r0,saver0(r30) ; Get the system call selector - mr. r0,r0 ; What kind is it? - blt- .L_kernel_syscall ; System call number if negative, this is a mach call... + 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... + beq-- .L_notify_interrupt_syscall ; Yeah, call it... - lwz r8,ACT_TASK(r13) ; Get our task - lis r10,hi16(EXT(c_syscalls_unix)) ; Get top half of counter address lwz r7,TASK_SYSCALLS_UNIX(r8) ; Get the current count - ori r10,r10,lo16(EXT(c_syscalls_unix)) ; Get low half of counter address - addi r7,r7,1 ; Bump it - lwz r9,0(r10) ; Get counter - stw r7,TASK_SYSCALLS_UNIX(r8) ; Save it mr r3,r30 ; Get PCB/savearea mr r4,r13 ; current activation - addi r9,r9,1 ; Add 1 - stw r9,0(r10) ; Save it back + addi r7,r7,1 ; Bump it + stw r7,TASK_SYSCALLS_UNIX(r8) ; Save it + +#if FPFLOOD + stfd f31,emfp31(r25) ; (TEST/DEBUG) +#endif + bl EXT(unix_syscall) ; Check out unix... .L_call_server_syscall_exception: @@ -377,9 +417,16 @@ noassist: cmplwi r15,0x7000 ; Do we have a fast path trap? b EXT(doexception) ; Go away, never to return... .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) - 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 @@ -387,7 +434,7 @@ noassist: cmplwi r15,0x7000 ; Do we have a fast path trap? ; 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 @@ -423,9 +470,19 @@ ppcscall: rlwinm r11,r0,2,18,29 ; Make an index into the table 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 + mtctr r11 ; Set the function address 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) @@ -433,12 +490,54 @@ 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.... - mfsprg r10,0 ; Get the per_proc + 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(r30) ; Restore the system call number + lwz r0,saver0+4(r30) ; Restore the system call number 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, @@ -447,213 +546,107 @@ LEXT(ppcscret) * r30 = pointer to saved state (in pcb) */ - .align 5 + .align 5 .L_kernel_syscall: ; ; 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 */ - neg r31,r0 ; Make system call number positive and put in r31 - lis r29,hi16(EXT(mach_trap_count)) ; High part of valid trap number - ori r29,r29,lo16(EXT(mach_trap_count)) ; Low part of valid trap number - lis r28,hi16(EXT(mach_trap_table)) ; High part of trap table - lwz r29,0(r29) ; Get the first invalid system call number - ori r28,r28,lo16(EXT(mach_trap_table)) ; Low part of trap table - - cmplw r31,r29 ; See if we have a valid system call number - slwi r31,r31,MACH_TRAP_OFFSET_POW2 ; Get offset into table - - bge- .L_call_server_syscall_exception ; System call number of bogus - - add r31,r31,r28 ; Point to the system call entry - lis r28,hi16(EXT(kern_invalid)) ; Get the high invalid routine address - lwz r0,MACH_TRAP_FUNCTION(r31) ; Grab the system call routine address - ori r28,r28,lo16(EXT(kern_invalid)) ; Get the low part of the invalid routine address - lwz r29,MACH_TRAP_ARGC(r31) ; Get the number of arguments in the call - cmplw r0,r28 ; Is this an invalid entry? - beq- .L_call_server_syscall_exception ; Yes, it is invalid... - -/* get arg count. If argc > 8 then not all args were in regs, - * so we must perform copyin. - */ - cmpwi cr0,r29,8 ; Do we have more than 8 arguments? - ble+ .L_syscall_got_args ; Nope, no copy in needed... - -/* 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 are 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 */ - - .align 5 - -.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 - - addi r27,r1,FM_ARG0-4 ; Point to area - 4 where we will store the arguments - -.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 */ - - .align 5 - -.L_syscall_copyin_done: - li r0,0 - stw r0,THREAD_RECOVER(r16) ; R16 still holds thread ptr - -.L_syscall_got_args: - lwz r0,MACH_TRAP_FUNCTION(r31) ; Get function address - 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 - mtctr r0 ; Set function address - 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 - - -; -; Note that all arguments from the system call are passed into the function -; + 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 - bctrl ; Perform the actual syscall + bctrl -/* '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, R3 = 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 . + * 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 - */ - -/* 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 + * 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 - */ - -.L_syscall_return: - mr r31,r16 ; Move the current thread pointer - stw r3,saver3(r30) ; Stash the return code - - mr r4,r30 ; Pass in the savearea - bl EXT(syscall_trace_end) ; Trace the exit of the system call - + .L_thread_syscall_ret_check_ast: + lis r10,hi16(MASK(MSR_VEC)) ; Get the vector enable mfmsr r12 ; Get the current MSR - rlwinm r12,r12,0,MSR_FP_BIT+1,MSR_FP_BIT-1 ; Force floating point off - rlwinm r12,r12,0,MSR_VEC_BIT+1,MSR_VEC_BIT-1 ; Force vectors off - rlwinm r12,r12,0,MSR_EE_BIT+1,MSR_EE_BIT-1 ; Turn off interruptions enable bit + 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 */ - lwz r4,PP_NEED_AST(r10) ; Get the pointer to the ast requests - lwz r4,0(r4) ; Get the flags + lwz r4,PP_PENDING_AST(r10) cmpi cr0,r4, 0 ; Any pending asts? - beq+ cr0,.L_syscall_no_ast ; Nope... + beq++ cr0,.L_syscall_no_ast ; Nope... /* Yes there is, call ast_taken * pretending that the user thread took an AST exception here, @@ -662,9 +655,9 @@ LEXT(ppcscret) #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) - bne+ scrnotkern ; returning to user level, check + bne++ scrnotkern ; returning to user level, check lis r0,hi16(Choke) ; Choke code ori r0,r0,lo16(Choke) ; and the rest @@ -674,11 +667,36 @@ LEXT(ppcscret) scrnotkern: #endif /* DEBUG */ - li r3,AST_ALL ; Set ast flags + 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). @@ -694,40 +712,18 @@ scrnotkern: .L_thread_syscall_return: mr r3,r30 ; Get savearea to the correct register for common exit - mfsprg r8,1 ; 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 + lwz r4,SAVprev+4(r30) ; Get the previous save area 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 + mfsprg r8,1 ; Now find the current activation addi r5,r5,KERNEL_STACK_SIZE-FM_SIZE ; Reset to empty - stw r4,ACT_MACT_PCB(r8) ; Save previous save area + 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... - .align 5 - -.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 ; Set bad access code - li r4,EXC_PPC_VM_PROT_READ ; Set protection exception - lwz r5,saver1(r30) ; Point to the stack - mr r6,r30 ; Pass savearea - - bl EXT(syscall_error) ; Generate error... - b .L_syscall_return ; Continue out... - - /* * thread_exception_return() * @@ -742,10 +738,10 @@ LEXT(thread_bootstrap_return) ; NOTE: THIS IS GOING AWAY IN A FEW DAYS.... LEXT(thread_exception_return) ; Directly return to user mode .L_thread_exc_ret_check_ast: + lis r10,hi16(MASK(MSR_VEC)) ; Get the vector enable mfmsr r3 ; Get the MSR - rlwinm r3,r3,0,MSR_FP_BIT+1,MSR_FP_BIT-1 ; Force floating point off - rlwinm r3,r3,0,MSR_VEC_BIT+1,MSR_VEC_BIT-1 ; Force vectors off - rlwinm r3,r3,0,MSR_EE_BIT+1,MSR_EE_BIT-1 ; Clear EE + 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 */ @@ -754,19 +750,20 @@ LEXT(thread_exception_return) ; Directly return to user mode 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 - 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 */ - li r3,AST_ALL + lis r3,hi16(AST_ALL) li r4,1 + ori r3,r3,lo16(AST_ALL) bl EXT(ast_taken) b .L_thread_exc_ret_check_ast ; check for a second AST (rare) @@ -777,7 +774,7 @@ LEXT(thread_exception_return) ; Directly return to user mode .L_exc_ret_no_ast: mfsprg r30,1 ; Get the currrent activation - lwz r31,ACT_THREAD(r30) ; Get the current thread + mr r31,r30 lwz r30,ACT_MACT_PCB(r30) mr. r30,r30 ; Is there any context yet? @@ -788,7 +785,7 @@ LEXT(thread_exception_return) ; Directly return to user mode * 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) bne+ ret_user2 ; We are ok... @@ -805,9 +802,9 @@ ret_user2: * which takes PCB pointer in R3, not in r30! */ lwz r0,SAVflags(r30) ; Grab the savearea flags - mr r3,r30 ; Copy pcb pointer into r3 in case we need it andis. r0,r0,SAVsyscall>>16 ; Are we returning from a syscall? - beq- cr0,thread_return ; Nope, must be a thread return... + 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... ; @@ -823,7 +820,7 @@ makeDummyCtx: li r4,SAVgeneral ; Get the general context type li r0,0 ; Get a 0 stb r4,SAVflags+2(r3) ; Set type - addi r2,r3,savevscr ; Point past what we are clearing + addi r2,r3,savefpscr+4 ; Point past what we are clearing mr r4,r3 ; Save the start cleardummy: stw r0,0(r4) ; Clear stuff @@ -833,7 +830,7 @@ cleardummy: stw r0,0(r4) ; Clear stuff 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! @@ -857,33 +854,32 @@ LEXT(ihandler) ; Interrupt handler */ * interrupt stack. */ - lwz r10,savesrr1(r4) ; Get SRR1 + lwz r10,savesrr1+4(r4) ; Get SRR1 lwz r7,savevrsave(r4) ; Get the VRSAVE register - mfsprg r25,0 ; Get the per_proc block + 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. r13,r10,0,MSR_VEC_BIT,MSR_VEC_BIT ; Was vector on? + rlwinm. r16,r10,0,MSR_VEC_BIT,MSR_VEC_BIT ; Was vector on? lwz r1,PP_ISTACKPTR(r25) ; Get the interrupt stack - li r13,0 ; Zero this for now - lwz r16,PP_ACTIVE_THREAD(r25) ; Get the thread pointer + 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 - cmplwi cr1,r16,0 ; Are we still booting? - -ifpoff: mr. r1,r1 ; Is it active? - beq- cr1,ihboot1 ; We are still coming up... - lwz r13,THREAD_TOP_ACT(r16) ; Pick up the active thread + 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 - -ihboot1: lwz r9,saver1(r4) ; Pick up the rupt time stack - stw r14,SAVprev(r4) ; Queue the new save area in the front + 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 - beq- cr1,ihboot4 ; We are still coming up... stw r4,ACT_MACT_PCB(r13) ; Point to our savearea + beq cr2,ifromk + stw r4,ACT_MACT_UPCB(r13) ; Store user savearea -ihboot4: bne .L_istackfree ; Nope... +ifromk: bne .L_istackfree ; Nope... /* We're already on the interrupt stack, get back the old * stack pointer and make room for a frame @@ -900,19 +896,27 @@ ihboot4: bne .L_istackfree ; Nope... 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+ ihsetback ; Yeah, that is ok too... + 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: - lwz r10,SAVflags(r4) + 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,HIGH_ADDR(SAVrststk) ; Indicate we reset stack when we return from this one + oris r10,r10,hi16(SAVrststk) ; Indicate we reset stack when we return from this one stw r10,SAVflags(r4) ; Stick it back /* @@ -937,14 +941,27 @@ ihbootnover: ; (TEST/DEBUG) * 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 + 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 */ - 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) @@ -956,26 +973,21 @@ ihbootnover: ; (TEST/DEBUG) LEXT(ihandler_ret) ; Marks our return point from debugger entry + lis r10,hi16(MASK(MSR_VEC)) ; Get the vector enable mfmsr r0 ; Get our MSR - rlwinm r0,r0,0,MSR_FP_BIT+1,MSR_FP_BIT-1 ; Force floating point off - rlwinm r0,r0,0,MSR_VEC_BIT+1,MSR_VEC_BIT-1 ; Force vectors off - rlwinm r0,r0,0,MSR_EE_BIT+1,MSR_EE_BIT-1 ; Flip off the interrupt enabled bit + 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 r10,0 ; Get the per_proc block + mfsprg r8,1 ; Get the current activation + lwz r10,ACT_PER_PROC(r8) ; Get the per_proc block lwz r7,SAVflags(r3) ; Pick up the flags - lwz r8,PP_ACTIVE_THREAD(r10) ; and the active thread - lwz r9,SAVprev(r3) ; Get previous save area + lwz r9,SAVprev+4(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,hi16(SAVrststk) ; Is this the first on the stack? - beq- cr1,ihboot3 ; Skip if we are still in init... + 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 - -ihboot3: mr r4,r3 ; Move the savearea pointer + mr r4,r3 ; Move the savearea pointer beq .L_no_int_ast2 ; Get going if not the top-o-stack... @@ -988,13 +1000,12 @@ ihboot3: mr r4,r3 ; Move the savearea pointer 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,PP_PREEMPT_CNT(r10) ; Get preemption level + 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_NEED_AST(r10) ; Get the AST request address - lwz r11,0(r11) ; Get the request + 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? @@ -1025,7 +1036,7 @@ ihboot3: mr r4,r3 ; Move the savearea pointer 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... + beq-- cr1,chkfac ; Jump away if we are in init... lwz r4,ACT_MACT_PCB(r8) ; Get the new level marker @@ -1051,31 +1062,27 @@ ihboot3: mr r4,r3 ; Move the savearea pointer ; are going to user state. CR2_eq will be set to indicate deferred. ; -chkfac: mr r31,r10 ; Move per_proc address - mr r30,r4 ; Preserve new level - lwz r29,savesrr1(r3) ; Get the current MSR +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... + beq-- chkenax ; Yeah, skip it all... rlwinm. r0,r29,0,MSR_PR_BIT,MSR_PR_BIT ; Are we going into user state? -#if 0 - beq+ lllll ; (TEST/DEBUG) - BREAKPOINT_TRAP ; (TEST/DEBUG) -lllll: -#endif - 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 - cmplw r27,r21 ; Are we returning from the active level? lhz r19,PP_CPU_NUMBER(r31) ; Get our CPU number - bne+ fpuchkena ; Nope... + cmplw r27,r21 ; Are we returning from the active level? + stw r0,holdQFret(r31) ; Make sure we hold off releasing quickfret + bne++ fpuchkena ; Nope... ; ; First clean up any live context we are returning from @@ -1087,20 +1094,28 @@ lllll: eieio ; Make sure this gets out before owner clear - lis r23,hi16(EXT(per_proc_info)) ; Set base per_proc - mulli r22,r22,ppSize ; Find offset to the owner per_proc - ori r23,r23,lo16(EXT(per_proc_info)) ; Set base per_proc - li r24,FPUowner ; Displacement to FPU owner - add r22,r23,r22 ; Point to the owner per_proc - li r0,0 ; We need this in a bit +#if ppeSize != 16 +#error per_proc_entry is not 16bytes in size +#endif -fpuinvothr: lwarx r23,r24,r22 ; Get the owner - cmplw r23,r20 ; Does he still have this context? - bne fpuinvoths ; Nope... - stwcx. r0,r24,r22 ; Try to invalidate it - bne- fpuinvothr ; Try again if there was a collision... + 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 -fpuinvoths: isync +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 ; ; Now if there is a savearea associated with the popped context, release it. @@ -1110,24 +1125,31 @@ fpuinvoths: isync 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... + 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... - lwz r24,SAVprev(r22) ; Pick up the previous area + 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... + beq-- fpuonlyone ; Nope... lwz r21,SAVlevel(r24) ; Get the level associated with save fpuonlyone: stw r24,FPUsave(r20) ; Dequeue this savearea rlwinm r3,r22,0,0,19 ; Find main savearea header - lwz r3,SACvrswap(r3) ; Get the virtual to real conversion - la r9,quickfret(r31) ; Point to the quickfret chain 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(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 lis r0,HIGH_ADDR(CutTrace) ; (TEST/DEBUG) @@ -1136,11 +1158,6 @@ fpuonlyone: stw r24,FPUsave(r20) ; Dequeue this savearea sc ; (TEST/DEBUG) #endif -fpufpucdq: lwarx r0,0,r9 ; Pick up the old chain head - stw r0,SAVprev(r22) ; Move it to the current guy - stwcx. r3,0,r9 ; Save it - bne- fpufpucdq ; Someone chaged the list... - fpusetlvl: stw r21,FPUlevel(r20) ; Save the level ; @@ -1150,33 +1167,75 @@ fpusetlvl: stw r21,FPUlevel(r20) ; Save the level ; going into user state. ; -fpuchkena: bt- cr2_eq,fpuhasdfrd ; Skip if deferred, R26 already set up... +fpuchkena: bt-- cr2_eq,fpuhasdfrd ; Skip if deferred, R26 already set up... mr r26,r20 ; Use the non-deferred value -fpuhasdfrd: lwz r21,FPUowner(r31) ; Get the ID of the live context +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 - cmplw cr3,r26,r21 ; Do we have the live context? lwz r24,FPUcpu(r26) ; Get the CPU that the context was last dispatched on - bne- cr3,chkvec ; No, can not possibly enable... + 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.... + 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... + beq++ fpuena ; Nope... lwz r25,SAVlevel(r24) ; Get the level of savearea - lwz r0,SAVprev(r24) ; Get the previous + 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... + bne++ fpuena ; No, just go enable... stw r0,FPUsave(r26) ; Pop the chain rlwinm r3,r24,0,0,19 ; Find main savearea header - lwz r3,SACvrswap(r3) ; Get the virtual to real conversion - la r9,quickfret(r31) ; Point to the quickfret chain 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 lis r0,HIGH_ADDR(CutTrace) ; (TEST/DEBUG) @@ -1184,34 +1243,11 @@ fpuhasdfrd: lwz r21,FPUowner(r31) ; Get the ID of the live context oris r0,r0,LOW_ADDR(CutTrace) ; (TEST/DEBUG) sc ; (TEST/DEBUG) #endif - -fpuhascdq: lwarx r0,0,r9 ; Pick up the old chain head - stw r0,SAVprev(r24) ; Move it to the current guy - stwcx. r3,0,r9 ; Save it - bne- fpuhascdq ; Someone chaged the list... fpuena: ori r29,r29,lo16(MASK(MSR_FP)) ; Enable facility chkvec: -#if 0 - rlwinm. r21,r29,0,MSR_PR_BIT,MSR_PR_BIT ; (TEST/DEBUG) - beq+ ppppp ; (TEST/DEBUG) - lwz r21,FPUlevel(r26) ; (TEST/DEBUG) - mr. r21,r21 ; (TEST/DEBUG) - bne- qqqqq ; (TEST/DEBUG) - lwz r21,FPUsave(r26) ; (TEST/DEBUG) - mr. r21,r21 ; (TEST/DEBUG) - beq+ ppppp ; (TEST/DEBUG) - lwz r22,SAVlevel(r21) ; (TEST/DEBUG) - mr. r22,r22 ; (TEST/DEBUG) - beq+ ppppp ; (TEST/DEBUG) -qqqqq: - BREAKPOINT_TRAP ; (TEST/DEBUG) - -ppppp: ; (TEST/DEBUG) -#endif - lwz r21,VMXlevel(r20) ; Get the facility level cmplw r27,r21 ; Are we returning from the active level? @@ -1228,20 +1264,24 @@ ppppp: ; (TEST/DEBUG) eieio ; Make sure this gets out before owner clear - lis r23,hi16(EXT(per_proc_info)) ; Set base per_proc - mulli r22,r22,ppSize ; Find offset to the owner per_proc - ori r23,r23,lo16(EXT(per_proc_info)) ; Set base per_proc - li r24,VMXowner ; Displacement to VMX owner - add r22,r23,r22 ; Point to the owner per_proc - li r0,0 ; We need this in a bit + 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 - cmplw r23,r20 ; Does he still have this context? - bne vmxinvoths ; Nope... - stwcx. r0,r24,r22 ; Try to invalidate it - bne- vmxinvothr ; Try again if there was a collision... - -vmxinvoths: isync + + 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... + + isync ; ; Now if there is a savearea associated with the popped context, release it. @@ -1251,24 +1291,31 @@ vmxinvoths: isync 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... + beq++ vmxsetlvl ; 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 vmxsetlvl ; No, leave as is... - lwz r24,SAVprev(r22) ; Pick up the previous area + 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... + 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 - lwz r3,SACvrswap(r3) ; Get the virtual to real conversion - la r9,quickfret(r31) ; Point to the quickfret chain 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(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 lis r0,HIGH_ADDR(CutTrace) ; (TEST/DEBUG) @@ -1276,11 +1323,6 @@ vmxonlyone: stw r24,VMXsave(r20) ; Dequeue this savearea oris r0,r0,LOW_ADDR(CutTrace) ; (TEST/DEBUG) sc ; (TEST/DEBUG) #endif - -vmxhscdq: lwarx r0,0,r9 ; Pick up the old chain head - stw r0,SAVprev(r22) ; Move it to the current guy - stwcx. r3,0,r9 ; Save it - bne- vmxhscdq ; Someone chaged the list... vmxsetlvl: stw r21,VMXlevel(r20) ; Save the level @@ -1292,26 +1334,33 @@ 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... + 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.... + 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... + beq++ vmxena ; Nope... lwz r25,SAVlevel(r24) ; Get the level of savearea - lwz r0,SAVprev(r24) ; Get the previous + 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... + bne++ vmxena ; No, just go enable... stw r0,VMXsave(r26) ; Pop the chain rlwinm r3,r24,0,0,19 ; Find main savearea header - lwz r3,SACvrswap(r3) ; Get the virtual to real conversion - la r9,quickfret(r31) ; Point to the quickfret chain 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 lis r0,HIGH_ADDR(CutTrace) ; (TEST/DEBUG) @@ -1320,20 +1369,19 @@ vmxchkena: lwz r21,VMXowner(r31) ; Get the ID of the live context sc ; (TEST/DEBUG) #endif -vmxckcdq: lwarx r0,0,r9 ; Pick up the old chain head - stw r0,SAVprev(r24) ; Move it to the current guy - stwcx. r3,0,r9 ; Save it - bne- vmxckcdq ; Someone chaged the list... - vmxena: oris r29,r29,hi16(MASK(MSR_VEC)) ; Enable facility - -setena: rlwinm. r0,r29,0,MSR_PR_BIT,MSR_PR_BIT ; Are we about to launch user state? - rlwinm r20,r29,(((31-vectorCngbit)+(MSR_VEC_BIT+1))&31),vectorCngbit,vectorCngbit ; Set flag if we enabled vector - stw r29,savesrr1(r27) ; Turn facility on or off +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 - lwz r19,deferctx(r28) ; Get any deferred facility context switch 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 @@ -1353,15 +1401,15 @@ setenaa: mfdec r24 ; Get decrementer 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- chkenax ; We have popped or are just about to... + 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+ chkenax ; No time set.... - bne- cr1,segtb ; Timebase ticked, get them again... + 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 @@ -1369,23 +1417,29 @@ segtb: mftbu r20 ; Get the upper time base 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 + 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+ chkenax ; No, do not reset decrementer... + 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 lwz r20,SAVact(r27) ; (TEST/DEBUG) Make sure our restore - lwz r21,PP_ACTIVE_THREAD(r31) ; (TEST/DEBUG) with the current act. + mfsprg r21, 1 ; (TEST/DEBUG) with the current act. cmpwi r21,0 ; (TEST/DEBUG) - beq- yeswereok ; (TEST/DEBUG) - lwz r21,THREAD_TOP_ACT(r21) ; (TEST/DEBUG) + beq-- yeswereok ; (TEST/DEBUG) cmplw r21,r20 ; (TEST/DEBUG) - beq+ yeswereok ; (TEST/DEBUG) + beq++ yeswereok ; (TEST/DEBUG) lis r0,hi16(Choke) ; (TEST/DEBUG) Choke code ori r0,r0,lo16(Choke) ; (TEST/DEBUG) and the rest @@ -1396,13 +1450,40 @@ chkenax: yeswereok: #endif - rlwinm r5,r27,0,0,19 ; Round savearea down to page bndry - lwz r5,SACvrswap(r5) ; Get the conversion from virtual to real - xor r3,r27,r5 ; Flip to physical address + 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 * We'll do what we can here because registers are already @@ -1421,34 +1502,38 @@ yeswereok: .align 5 -fastpath: cmplwi cr3,r0,0x7FF1 ; Is it CthreadSetSelfNumber? - bnelr- cr3 ; Not a fast path... +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) * - * 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 - * */ 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): - rlwinm r9,r4,0,0,19 /* Round down to the base savearea block */ - lwz r9,SACvrswap(r9) /* Get the conversion from virtual to real */ - 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... /* @@ -1462,12 +1547,12 @@ EXT(fastexit): checkassist: lwz r0,saveexception(r4) ; Get the exception code - lwz r23,savesrr1(r4) ; Get the interrupted MSR + 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(r4) ; Get trapped address + 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 @@ -1495,13 +1580,14 @@ exitFromVM: mr r30,r4 ; Get the savearea .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 - 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 - 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) @@ -1531,15 +1617,14 @@ LEXT(retFromVM) .align 5 .globl EXT(chandler) -LEXT(chandler) /* Choke handler */ +LEXT(chandler) ; Choke handler - lis r25,hi16(EXT(trcWork)) ; (TEST/DEBUG) - li r31,0 ; (TEST/DEBUG) - ori r25,r25,lo16(EXT(trcWork)) ; (TEST/DEBUG) - stw r31,traceMask(r25) ; (TEST/DEBUG) + 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 - mfsprg r25,0 ; Get the per_proc lwz r1,PP_DEBSTACKPTR(r25) ; Get debug stack pointer cmpwi r1,-1 ; Are we already choking? @@ -1555,7 +1640,7 @@ chokespin: addi r31,r31,1 ; Spin and hope for an analyzer connection... chokefirst: li r0,-1 ; Set choke value mr. r1,r1 ; See if we are on debug stack yet - lwz r10,saver1(r4) ; + lwz r10,saver1+4(r4) ; stw r0,PP_DEBSTACKPTR(r25) ; Show we are choking bne chokestart ; We are not on the debug stack yet... @@ -1580,7 +1665,24 @@ chokestart: li r0,0 ; Get a zero ; versave: -#if 1 +#if 0 + 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) + 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 + +#if 0 + ;; This code is broken and migration will make the matter even worse ; ; Make sure that all savearea chains have the right type on them ; @@ -1659,190 +1761,9 @@ versavetype: stw r22,0(r22) ; (TEST/DEBUG) Lock out more checks BREAKPOINT_TRAP ; (TEST/DEBUG) Get into debugger -versvok: lwz r20,SAVprev(r20) ; (TEST/DEBUG) Get the previous one +versvok: lwz r20,SAVprev+4(r20) ; (TEST/DEBUG) Get the previous one b versavetype ; (TEST/DEBUG) Go check its type... #endif -#if 0 -; -; 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