/* * 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@ */ #include <assym.s> #include <debug.h> #include <ppc/asm.h> #include <ppc/proc_reg.h> #include <ppc/exception.h> /* * This file contains implementations for the Virtual Machine Monitor * facility. */ /* * int vmm_dispatch(savearea, act); * vmm_dispatch is a PPC only system call. It is used with a selector (first * parameter) to determine what function to enter. This is treated as an extension * of hw_exceptions. * * Inputs: * R4 = current activation * R16 = current thread * R30 = current savearea */ .align 5 /* Line up on cache line */ .globl EXT(vmm_dispatch_table) LEXT(vmm_dispatch_table) /* Don't change the order of these routines in the table. It's */ /* OK to add new routines, but they must be added at the bottom. */ .long EXT(vmm_get_version_sel) ; Get the version of the VMM interface .long EXT(vmm_get_features_sel) ; Get the features of the VMM interface .long EXT(vmm_init_context_sel) ; Initializes a new VMM context .long EXT(vmm_tear_down_context) ; Tears down a previously-allocated VMM context .long EXT(vmm_tear_down_all) ; Tears down all VMMs .long EXT(vmm_map_page) ; Maps a page from the main address space into the VM space .long EXT(vmm_get_page_mapping) ; Returns client va associated with VM va .long EXT(vmm_unmap_page) ; Unmaps a page from the VM space .long EXT(vmm_unmap_all_pages) ; Unmaps all pages from the VM space .long EXT(vmm_get_page_dirty_flag) ; Gets the change bit for a page and optionally clears it .long EXT(vmm_get_float_state) ; Gets current floating point state .long EXT(vmm_get_vector_state) ; Gets current vector state .long EXT(vmm_set_timer) ; Sets a timer value .long EXT(vmm_get_timer) ; Gets a timer value .long EXT(switchIntoVM) ; Switches to the VM context .long EXT(vmm_protect_page) ; Sets protection values for a page .long EXT(vmm_map_execute) ; Maps a page an launches VM .long EXT(vmm_protect_execute) ; Sets protection values for a page and launches VM .long EXT(vmm_map_list) ; Maps a list of pages .long EXT(vmm_unmap_list) ; Unmaps a list of pages .set vmm_count,(.-EXT(vmm_dispatch_table))/4 ; Get the top number .align 5 .globl EXT(vmm_dispatch) LEXT(vmm_dispatch) lwz r11,saver3(r30) ; Get the selector mr r3,r4 ; All of our functions want the activation as the first parm lis r10,hi16(EXT(vmm_dispatch_table)) ; Get top half of table cmplwi r11,kVmmExecuteVM ; Should we switch to the VM now? cmplwi cr1,r11,vmm_count ; See if we have a valid selector ori r10,r10,lo16(EXT(vmm_dispatch_table)) ; Get low half of table lwz r4,saver4(r30) ; Get 1st parameter after selector beq+ EXT(switchIntoVM) ; Yes, go switch to it.... rlwinm r11,r11,2,0,29 ; Index into table bgt- cr1,vmmBogus ; It is a bogus entry lwzx r10,r10,r11 ; Get address of routine lwz r5,saver5(r30) ; Get 2nd parameter after selector lwz r6,saver6(r30) ; Get 3rd parameter after selector mtlr r10 ; Set the routine address lwz r7,saver7(r30) ; Get 4th parameter after selector ; ; NOTE: currently the most paramters for any call is 4. We will support at most 8 because we ; do not want to get into any stack based parms. However, here is where we need to add ; code for the 5th - 8th parms if we need them. ; blrl ; Call function stw r3,saver3(r30) ; Pass back the return code li r3,1 ; Set normal return with check for AST b EXT(ppcscret) ; Go back to handler... vmmBogus: li r3,0 ; Bogus selector, treat like a bogus system call b EXT(ppcscret) ; Go back to handler... .align 5 .globl EXT(vmm_get_version_sel) LEXT(vmm_get_version_sel) ; Selector based version of get version lis r3,hi16(EXT(vmm_get_version)) ori r3,r3,lo16(EXT(vmm_get_version)) b selcomm .align 5 .globl EXT(vmm_get_features_sel) LEXT(vmm_get_features_sel) ; Selector based version of get features lis r3,hi16(EXT(vmm_get_features)) ori r3,r3,lo16(EXT(vmm_get_features)) b selcomm .align 5 .globl EXT(vmm_init_context_sel) LEXT(vmm_init_context_sel) ; Selector based version of init context lwz r4,saver4(r30) ; Get the passed in version lwz r5,saver5(r30) ; Get the passed in comm area lis r3,hi16(EXT(vmm_init_context)) stw r4,saver3(r30) ; Cheat and move this parameter over ori r3,r3,lo16(EXT(vmm_init_context)) stw r5,saver4(r30) ; Cheat and move this parameter over selcomm: mtlr r3 ; Set the real routine address mr r3,r30 ; Pass in the savearea blrl ; Call the function b EXT(ppcscret) ; Go back to handler... /* * Here is where we transition to the virtual machine. * * We will swap the register context in the savearea with that which is saved in our shared * context area. We will validity check a bit and clear any nasty bits in the MSR and force * the manditory ones on. * * Then we will setup the new address space to run with, and anything else that is normally part * of a context switch. * * The vmm_execute_vm entry point is for the fused vmm_map_execute and vmm_protect_execute * calls. This is called, but never returned from. We always go directly back to the * user from here. * * Still need to figure out final floats and vectors. For now, we will go brute * force and when we go into the VM, we will force save any normal floats and * vectors. Then we will hide them and swap the VM copy (if any) into the normal * chain. When we exit VM we will do the opposite. This is not as fast as I would * like it to be. * * */ .align 5 .globl EXT(vmm_execute_vm) LEXT(vmm_execute_vm) lwz r30,ACT_MACT_PCB(r3) ; Restore the savearea pointer because it could be trash here b EXT(switchIntoVM) ; Join common... .align 5 .globl EXT(switchIntoVM) LEXT(switchIntoVM) lwz r5,vmmControl(r3) ; Pick up the control table address subi r4,r4,1 ; Switch to zero offset rlwinm. r2,r5,0,0,30 ; Is there a context there? (Note: we will ignore bit 31 so that we ; do not try this while we are transitioning off to on cmplwi cr1,r4,kVmmMaxContextsPerThread ; Is the index valid? beq- vmmBogus ; Not started, treat like a bogus system call mulli r2,r4,vmmCEntrySize ; Get displacement from index bgt- cr1,swvmmBogus ; Index is bogus... add r2,r2,r5 ; Point to the entry lwz r4,vmmFlags(r2) ; Get the flags for the selected entry lwz r5,vmmContextKern(r2) ; Get the context area address rlwinm. r26,r4,0,vmmInUseb,vmmInUseb ; See if the slot is in use bne+ swvmChkIntcpt ; We are so cool. Go do check for immediate intercepts... swvmmBogus: li r2,kVmmBogusContext ; Set bogus index return li r3,1 ; Set normal return with check for AST stw r2,saver3(r30) ; Pass back the return code b EXT(ppcscret) ; Go back to handler... ; ; Here we check for any immediate intercepts. So far, the only ; two of these are a timer pop and and external stop. We will not dispatch if ; either is true. They need to either reset the timer (i.e. set timer ; to 0) or to set a future time, or if it is external stop, set the vmmXStopRst flag. ; swvmChkIntcpt: lwz r6,vmmCntrl(r5) ; Get the control field rlwinm. r7,r6,0,vmmXStartb,vmmXStartb ; Clear all but start bit beq+ swvmChkStop ; Do not reset stop andc r6,r6,r7 ; Clear it li r8,vmmFlags ; Point to the flags stw r6,vmmCntrl(r5) ; Set the control field swvmtryx: lwarx r4,r8,r2 ; Pick up the flags rlwinm r4,r4,0,vmmXStopb+1,vmmXStopb-1 ; Clear the stop bit stwcx. r4,r8,r2 ; Save the updated field bne- swvmtryx ; Try again... swvmChkStop: rlwinm. r26,r4,0,vmmXStopb,vmmXStopb ; Is this VM stopped? beq+ swvmNoStop ; Nope... li r2,kVmmStopped ; Set stopped return li r3,1 ; Set normal return with check for AST stw r2,saver3(r30) ; Pass back the return code stw r2,return_code(r5) ; Save the exit code b EXT(ppcscret) ; Go back to handler... swvmNoStop: rlwinm. r26,r4,0,vmmTimerPopb,vmmTimerPopb ; Did the timer go pop? beq+ swvmDoSwitch ; No... li r2,kVmmReturnNull ; Set null return li r3,1 ; Set normal return with check for AST stw r2,saver3(r30) ; Pass back the return code stw r2,return_code(r5) ; Save the exit code b EXT(ppcscret) ; Go back to handler... ; ; Here is where we actually swap into the VM (alternate) context. ; We will bulk do a wholesale swap of the registers in the context area (the VMs) ; with the ones in the savearea (our main code). During the copy, we will fix up the ; MSR, forcing on a few bits and turning off a few others. Then we will deal with the ; PMAP and other per_proc stuff. Finally, we will exit back through the main exception ; handler to deal with unstacking saveareas and ASTs, etc. ; swvmDoSwitch: ; ; First, we save the volatile registers we care about. Remember, all register ; handling here is pretty funky anyway, so we just pick the ones that are ok. ; mr r26,r3 ; Save the activation pointer la r11,vmmFacCtx(r2) ; Point to the virtual machine facility context mr r27,r2 ; Save the context entry stw r11,deferctx(r3) ; Start using the virtual machine facility context when we exit lwz r11,ACT_MACT_SPF(r26) ; Get the special flags lwz r3,vmmPmap(r27) ; Get the pointer to the PMAP oris r15,r11,hi16(runningVM) ; ; Show that we are swapped to the VM right now bl EXT(hw_set_user_space_dis) ; Swap the address spaces lwz r17,vmmFlags(r27) ; Get the status flags mfsprg r10,0 ; Get the per_proc rlwinm. r0,r17,0,vmmMapDoneb,vmmMapDoneb ; Did we just do a map function? stw r27,vmmCEntry(r26) ; Remember what context we are running andc r17,r17,r0 ; Turn off map flag beq+ swvmNoMap ; No mapping done... ; ; This little bit of hoopala here (triggered by vmmMapDone) is ; a performance enhancement. This will change the returning savearea ; to look like we had a DSI rather than a system call. Then, setting ; the redrive bit, the exception handler will redrive the exception as ; a DSI, entering the last mapped address into the hash table. This keeps ; double faults from happening. Note that there is only a gain if the VM ; takes a fault, then the emulator resolves it only, and then begins ; the VM execution again. It seems like this should be the normal case. ; lwz r3,SAVflags(r30) ; Pick up the savearea flags lwz r2,vmmLastMap(r27) ; Get the last mapped address li r20,T_DATA_ACCESS ; Change to DSI fault oris r3,r3,hi16(SAVredrive) ; Set exception redrive stw r2,savedar(r30) ; Set the DAR to the last thing we mapped stw r3,SAVflags(r30) ; Turn on the redrive request lis r2,hi16(MASK(DSISR_HASH)) ; Set PTE/DBAT miss stw r20,saveexception(r30) ; Say we need to emulate a DSI stw r2,savedsisr(r30) ; Pretend we have a PTE miss swvmNoMap: lwz r20,vmmContextKern(r27) ; Get the comm area rlwimi r15,r17,32-(floatCngbit-vmmFloatCngdb),floatCngbit,vectorCngbit ; Shift and insert changed bits lwz r20,vmmCntrl(r20) ; Get the control flags rlwimi r17,r11,8,24,31 ; Save the old spf flags rlwimi r15,r20,32+vmmKeyb-userProtKeybit,userProtKeybit,userProtKeybit ; Set the protection key stw r15,spcFlags(r10) ; Set per_proc copy of the special flags stw r15,ACT_MACT_SPF(r26) ; Get the special flags stw r17,vmmFlags(r27) ; Set the status flags bl swapCtxt ; First, swap the general register state lwz r17,vmmContextKern(r27) ; Get the comm area back la r25,vmmFacCtx(r27) ; Point to the facility context lwz r15,vmmCntrl(r17) ; Get the control flags again mfsprg r29,0 ; Get the per_proc ; ; Check if there is new floating point context to load ; rlwinm. r0,r15,0,vmmFloatLoadb,vmmFloatLoadb ; Are there new floating point values? lhz r29,PP_CPU_NUMBER(r29) ; Get our cpu number li r14,vmmppcFPRs ; Get displacement to the new values andc r15,r15,r0 ; Clear the bit beq+ swvmNoNewFloats ; Nope, good... lwz r19,FPUcpu(r25) ; Get the last CPU we ran on stw r29,FPUcpu(r25) ; Claim the context for ourselves eieio ; Make sure this stays in order lis r18,hi16(EXT(per_proc_info)) ; Set base per_proc mulli r19,r19,ppSize ; Find offset to the owner per_proc ori r18,r18,lo16(EXT(per_proc_info)) ; Set base per_proc li r16,FPUowner ; Displacement to float owner add r19,r18,r19 ; Point to the owner per_proc li r0,0 ; Clear this out swvminvfpu: lwarx r18,r16,r19 ; Get the owner cmplw r18,r25 ; Does he still have this context? bne swvminvfpv ; Nope... stwcx. r0,r16,r19 ; Try to invalidate it bne- swvminvfpu ; Try again if there was a collision... swvminvfpv: lwz r3,FPUsave(r25) ; Get the FPU savearea dcbt r14,r17 ; Touch in first line of new stuff mr. r3,r3 ; Is there one? bne+ swvmGotFloat ; Yes... bl EXT(save_get) ; Get a savearea li r7,SAVfloat ; Get floating point flag stw r26,SAVact(r3) ; Save our activation li r0,0 ; Get a zero stb r7,SAVflags+2(r3) ; Set that this is floating point stw r0,SAVprev(r3) ; Clear the back chain stw r0,SAVlevel(r3) ; We are always at level 0 (user state) stw r3,FPUsave(r25) ; Chain us to context swvmGotFloat: la r4,savefp0(r3) ; Point to the destination mr r21,r3 ; Save the save area la r3,vmmppcFPRs(r17) ; Point to the source li r5,32*8 ; Get the size (32 FPRs at 8 bytes each) bl EXT(bcopy) ; Copy the new values lwz r14,vmmppcFPSCRshadow(r17) ; Get the fpscr pad lwz r10,vmmppcFPSCRshadow+4(r17) ; Get the fpscr stw r14,savefpscrpad(r30) ; Save the new fpscr pad stw r10,savefpscr(r30) ; Save the new fpscr lwz r11,ACT_MACT_SPF(r26) ; Get the special flags stw r15,vmmCntrl(r17) ; Save the control flags sans vmmFloatLoad rlwinm r11,r11,0,floatCngbit+1,floatCngbit-1 ; Clear the changed bit here lwz r14,vmmStat(r17) ; Get the status flags mfsprg r10,0 ; Get the per_proc stw r11,ACT_MACT_SPF(r26) ; Get the special flags rlwinm r14,r14,0,vmmFloatCngdb+1,vmmFloatCngdb-1 ; Clear the changed flag stw r11,spcFlags(r10) ; Set per_proc copy of the special flags stw r14,vmmStat(r17) ; Set the status flags sans vmmFloatCngd ; ; Check if there is new vector context to load ; swvmNoNewFloats: rlwinm. r0,r15,0,vmmVectLoadb,vmmVectLoadb ; Are there new vector values? li r14,vmmppcVRs ; Get displacement to the new values andc r15,r15,r0 ; Clear the bit beq+ swvmNoNewVects ; Nope, good... lwz r19,VMXcpu(r25) ; Get the last CPU we ran on stw r29,VMXcpu(r25) ; Claim the context for ourselves eieio ; Make sure this stays in order lis r18,hi16(EXT(per_proc_info)) ; Set base per_proc mulli r19,r19,ppSize ; Find offset to the owner per_proc ori r18,r18,lo16(EXT(per_proc_info)) ; Set base per_proc li r16,VMXowner ; Displacement to vector owner add r19,r18,r19 ; Point to the owner per_proc li r0,0 ; Clear this out swvminvvec: lwarx r18,r16,r19 ; Get the owner cmplw r18,r25 ; Does he still have this context? bne swvminvved ; Nope... stwcx. r0,r16,r19 ; Try to invalidate it bne- swvminvvec ; Try again if there was a collision... swvminvved: lwz r3,VMXsave(r25) ; Get the vector savearea dcbt r14,r17 ; Touch in first line of new stuff mr. r3,r3 ; Is there one? bne+ swvmGotVect ; Yes... bl EXT(save_get) ; Get a savearea li r7,SAVvector ; Get the vector type flag stw r26,SAVact(r3) ; Save our activation li r0,0 ; Get a zero stb r7,SAVflags+2(r3) ; Set that this is vector stw r0,SAVprev(r3) ; Clear the back chain stw r0,SAVlevel(r3) ; We are always at level 0 (user state) stw r3,VMXsave(r25) ; Chain us to context swvmGotVect: mr r21,r3 ; Save the pointer to the savearea la r4,savevr0(r3) ; Point to the destination la r3,vmmppcVRs(r17) ; Point to the source li r5,32*16 ; Get the size (32 vectors at 16 bytes each) bl EXT(bcopy) ; Copy the new values lwz r11,vmmppcVSCRshadow+0(r17) ; Get the VSCR lwz r14,vmmppcVSCRshadow+4(r17) ; Get the VSCR lwz r10,vmmppcVSCRshadow+8(r17) ; Get the VSCR lwz r9,vmmppcVSCRshadow+12(r17) ; Get the VSCR lwz r8,savevrsave(r30) ; Get the current VRSave stw r11,savevscr+0(r30) ; Set the VSCR stw r14,savevscr+4(r30) ; Set the VSCR stw r10,savevscr+8(r30) ; Set the VSCR stw r9,savevscr+12(r30) ; Set the VSCR stw r8,savevrvalid(r21) ; Set the current VRSave as valid saved lwz r11,ACT_MACT_SPF(r26) ; Get the special flags stw r15,vmmCntrl(r17) ; Save the control flags sans vmmVectLoad rlwinm r11,r11,0,vectorCngbit+1,vectorCngbit-1 ; Clear the changed bit here lwz r14,vmmStat(r17) ; Get the status flags mfsprg r10,0 ; Get the per_proc stw r11,ACT_MACT_SPF(r26) ; Get the special flags rlwinm r14,r14,0,vmmVectCngdb+1,vmmVectCngdb-1 ; Clear the changed flag stw r11,spcFlags(r10) ; Set per_proc copy of the special flags stw r14,vmmStat(r17) ; Set the status flags sans vmmVectCngd swvmNoNewVects: li r3,1 ; Show normal exit with check for AST lwz r16,ACT_THREAD(r26) ; Restore the thread pointer b EXT(ppcscret) ; Go back to handler... ; ; Here is where we exit from vmm mode. We do this on any kind of exception. ; Interruptions (decrementer, external, etc.) are another story though. ; These we just pass through. We also switch back explicity when requested. ; This will happen in response to a timer pop and some kinds of ASTs. ; ; Inputs: ; R3 = activation ; R4 = savearea ; .align 5 .globl EXT(vmm_exit) LEXT(vmm_exit) lwz r2,vmmCEntry(r3) ; Get the context that is active lwz r12,ACT_VMMAP(r3) ; Get the VM_MAP for this guy lwz r11,ACT_MACT_SPF(r3) ; Get the special flags lwz r19,vmmFlags(r2) ; Get the status flags mr r16,r3 ; R16 is safe to use for the activation address rlwimi r19,r11,floatCngbit-vmmFloatCngdb,vmmFloatCngdb,vmmVectCngdb ; Shift and insert changed bits li r0,0 ; Get a zero rlwimi r11,r19,vmmSpfSaveb,floatCngbit,vectorCngbit ; Restore the saved part of the spf lwz r3,VMMAP_PMAP(r12) ; Get the pmap for the activation rlwinm r11,r11,0,runningVMbit+1,runningVMbit-1 ; Clear the "in VM" flag stw r0,vmmCEntry(r16) ; Clear pointer to active context stw r19,vmmFlags(r2) ; Set the status flags rlwinm r11,r11,0,userProtKeybit+1,userProtKeybit-1 ; Set back to normal protection key mfsprg r10,0 ; Get the per_proc block stw r11,ACT_MACT_SPF(r16) ; Get the special flags stw r11,spcFlags(r10) ; Set per_proc copy of the special flags mr r26,r16 ; Save the activation pointer mr r27,r2 ; Save the context entry bl EXT(hw_set_user_space_dis) ; Swap the address spaces back to the emulator la r5,facctx(r16) ; Point to the main facility context mr r2,r27 ; Restore stw r5,deferctx(r16) ; Start using the main facility context on the way out lwz r5,vmmContextKern(r27) ; Get the context area address mr r3,r16 ; Restore activation address stw r19,vmmStat(r5) ; Save the changed and popped flags bl swapCtxt ; Exchange the VM context for the emulator one stw r8,saver3(r30) ; Set the return code as the return value also b EXT(retFromVM) ; Go back to handler... ; ; Here is where we force exit from vmm mode. We do this when as ; part of termination and is used to insure that we are not executing ; in an alternate context. Because this is called from C we need to save ; all non-volatile registers. ; ; Inputs: ; R3 = activation ; R4 = user savearea ; Interruptions disabled ; .align 5 .globl EXT(vmm_force_exit) LEXT(vmm_force_exit) stwu r1,-(FM_ALIGN(20*4)+FM_SIZE)(r1) ; Get enough space for the registers mflr r0 ; Save the return stmw r13,FM_ARG0(r1) ; Save all non-volatile registers stw r0,(FM_ALIGN(20*4)+FM_SIZE+FM_LR_SAVE)(r1) ; Save the return lwz r2,vmmCEntry(r3) ; Get the context that is active lwz r11,ACT_MACT_SPF(r3) ; Get the special flags lwz r19,vmmFlags(r2) ; Get the status flags lwz r12,ACT_VMMAP(r3) ; Get the VM_MAP for this guy rlwimi r19,r11,floatCngbit-vmmFloatCngdb,vmmFloatCngdb,vmmVectCngdb ; Shift and insert changed bits mr r26,r3 ; Save the activation pointer rlwimi r11,r19,vmmSpfSaveb,floatCngbit,vectorCngbit ; Restore the saved part of the spf li r0,0 ; Get a zero rlwinm r9,r11,0,runningVMbit+1,runningVMbit-1 ; Clear the "in VM" flag cmplw r9,r11 ; Check if we were in a vm lwz r3,VMMAP_PMAP(r12) ; Get the pmap for the activation beq- vfeNotRun ; We were not in a vm.... rlwinm r9,r9,0,userProtKeybit+1,userProtKeybit-1 ; Set back to normal protection key stw r0,vmmCEntry(r26) ; Clear pointer to active context mfsprg r10,0 ; Get the per_proc block stw r9,ACT_MACT_SPF(r26) ; Get the special flags stw r9,spcFlags(r10) ; Set per_proc copy of the special flags mr r27,r2 ; Save the context entry mr r30,r4 ; Save the savearea bl EXT(hw_set_user_space_dis) ; Swap the address spaces back to the emulator la r7,facctx(r26) ; Point to the main facility context lwz r5,vmmContextKern(r27) ; Get the context area address stw r19,vmmStat(r5) ; Save the changed and popped flags stw r7,deferctx(r26) ; Tell context launcher to switch facility context bl swapCtxt ; Exchange the VM context for the emulator one lwz r8,saveexception(r30) ; Pick up the exception code lwz r7,SAVflags(r30) ; Pick up the savearea flags lis r9,hi16(SAVredrive) ; Get exception redrive bit rlwinm r8,r8,30,24,31 ; Convert exception to return code andc r7,r7,r9 ; Make sure redrive is off because we are intercepting stw r8,saver3(r30) ; Set the return code as the return value also stw r7,SAVflags(r30) ; Set the savearea flags vfeNotRun: lmw r13,FM_ARG0(r1) ; Restore all non-volatile registers lwz r1,0(r1) ; Pop the stack lwz r0,FM_LR_SAVE(r1) ; Get the return address mtlr r0 ; Set return blr ; ; Note: we will not do any DCBTs to the savearea. It was just stored to a few cycles ago and should ; still be in the cache. ; ; NOTE NOTE: R16 is important to save!!!! ; .align 5 swapCtxt: la r6,vmmppcpc(r5) ; Point to the first line lwz r14,saveexception(r30) ; Get the exception code dcbt 0,r6 ; Touch in the first line of the context area lwz r7,savesrr0(r30) ; Start moving context lwz r8,savesrr1(r30) lwz r9,saver0(r30) cmplwi cr1,r14,T_SYSTEM_CALL ; Are we switching because of a system call? lwz r10,saver1(r30) lwz r11,saver2(r30) lwz r12,saver3(r30) lwz r13,saver4(r30) la r6,vmmppcr6(r5) ; Point to second line lwz r14,saver5(r30) dcbt 0,r6 ; Touch second line of context area lwz r15,vmmppcpc(r5) ; First line of context lis r22,hi16(MSR_IMPORT_BITS) ; Get the MSR bits that are controllable by user lwz r23,vmmppcmsr(r5) ori r22,r25,lo16(MSR_IMPORT_BITS) ; Get the rest of the MSR bits that are controllable by user lwz r17,vmmppcr0(r5) lwz r18,vmmppcr1(r5) and r23,r23,r22 ; Keep only the controllable bits lwz r19,vmmppcr2(r5) oris r23,r23,hi16(MSR_EXPORT_MASK_SET) ; Force on the required bits lwz r20,vmmppcr3(r5) ori r23,r23,lo16(MSR_EXPORT_MASK_SET) ; Force on the other required bits lwz r21,vmmppcr4(r5) lwz r22,vmmppcr5(r5) dcbt 0,r6 ; Touch third line of context area stw r7,vmmppcpc(r5) ; Save emulator context into the context area stw r8,vmmppcmsr(r5) stw r9,vmmppcr0(r5) stw r10,vmmppcr1(r5) stw r11,vmmppcr2(r5) stw r12,vmmppcr3(r5) stw r13,vmmppcr4(r5) stw r14,vmmppcr5(r5) ; ; Save the first 3 parameters if we are an SC (we will take care of the last later) ; bne+ cr1,swapnotsc ; Skip next if not an SC exception... stw r12,return_params+0(r5) ; Save the first return stw r13,return_params+4(r5) ; Save the second return stw r14,return_params+8(r5) ; Save the third return swapnotsc: stw r15,savesrr0(r30) ; Save vm context into the savearea stw r23,savesrr1(r30) stw r17,saver0(r30) stw r18,saver1(r30) stw r19,saver2(r30) stw r20,saver3(r30) stw r21,saver4(r30) la r6,vmmppcr14(r5) ; Point to fourth line stw r22,saver5(r30) dcbt 0,r6 ; Touch fourth line ; Swap 8 registers lwz r7,saver6(r30) ; Read savearea lwz r8,saver7(r30) lwz r9,saver8(r30) lwz r10,saver9(r30) lwz r11,saver10(r30) lwz r12,saver11(r30) lwz r13,saver12(r30) lwz r14,saver13(r30) lwz r15,vmmppcr6(r5) ; Read vm context lwz r24,vmmppcr7(r5) lwz r17,vmmppcr8(r5) lwz r18,vmmppcr9(r5) lwz r19,vmmppcr10(r5) lwz r20,vmmppcr11(r5) lwz r21,vmmppcr12(r5) lwz r22,vmmppcr13(r5) stw r7,vmmppcr6(r5) ; Write context stw r8,vmmppcr7(r5) stw r9,vmmppcr8(r5) stw r10,vmmppcr9(r5) stw r11,vmmppcr10(r5) stw r12,vmmppcr11(r5) stw r13,vmmppcr12(r5) la r6,vmmppcr22(r5) ; Point to fifth line stw r14,vmmppcr13(r5) dcbt 0,r6 ; Touch fifth line stw r15,saver6(r30) ; Write vm context stw r24,saver7(r30) stw r17,saver8(r30) stw r18,saver9(r30) stw r19,saver10(r30) stw r20,saver11(r30) stw r21,saver12(r30) stw r22,saver13(r30) ; Swap 8 registers lwz r7,saver14(r30) ; Read savearea lwz r8,saver15(r30) lwz r9,saver16(r30) lwz r10,saver17(r30) lwz r11,saver18(r30) lwz r12,saver19(r30) lwz r13,saver20(r30) lwz r14,saver21(r30) lwz r15,vmmppcr14(r5) ; Read vm context lwz r24,vmmppcr15(r5) lwz r17,vmmppcr16(r5) lwz r18,vmmppcr17(r5) lwz r19,vmmppcr18(r5) lwz r20,vmmppcr19(r5) lwz r21,vmmppcr20(r5) lwz r22,vmmppcr21(r5) stw r7,vmmppcr14(r5) ; Write context stw r8,vmmppcr15(r5) stw r9,vmmppcr16(r5) stw r10,vmmppcr17(r5) stw r11,vmmppcr18(r5) stw r12,vmmppcr19(r5) stw r13,vmmppcr20(r5) la r6,vmmppcr30(r5) ; Point to sixth line stw r14,vmmppcr21(r5) dcbt 0,r6 ; Touch sixth line stw r15,saver14(r30) ; Write vm context stw r24,saver15(r30) stw r17,saver16(r30) stw r18,saver17(r30) stw r19,saver18(r30) stw r20,saver19(r30) stw r21,saver20(r30) stw r22,saver21(r30) ; Swap 8 registers lwz r7,saver22(r30) ; Read savearea lwz r8,saver23(r30) lwz r9,saver24(r30) lwz r10,saver25(r30) lwz r11,saver26(r30) lwz r12,saver27(r30) lwz r13,saver28(r30) lwz r14,saver29(r30) lwz r15,vmmppcr22(r5) ; Read vm context lwz r24,vmmppcr23(r5) lwz r17,vmmppcr24(r5) lwz r18,vmmppcr25(r5) lwz r19,vmmppcr26(r5) lwz r20,vmmppcr27(r5) lwz r21,vmmppcr28(r5) lwz r22,vmmppcr29(r5) stw r7,vmmppcr22(r5) ; Write context stw r8,vmmppcr23(r5) stw r9,vmmppcr24(r5) stw r10,vmmppcr25(r5) stw r11,vmmppcr26(r5) stw r12,vmmppcr27(r5) stw r13,vmmppcr28(r5) la r6,vmmppcvscr(r5) ; Point to seventh line stw r14,vmmppcr29(r5) dcbt 0,r6 ; Touch seventh line stw r15,saver22(r30) ; Write vm context stw r24,saver23(r30) stw r17,saver24(r30) stw r18,saver25(r30) stw r19,saver26(r30) stw r20,saver27(r30) stw r21,saver28(r30) stw r22,saver29(r30) ; Swap 8 registers lwz r7,saver30(r30) ; Read savearea lwz r8,saver31(r30) lwz r9,savecr(r30) lwz r10,savexer(r30) lwz r11,savelr(r30) lwz r12,savectr(r30) lwz r14,savevrsave(r30) lwz r15,vmmppcr30(r5) ; Read vm context lwz r24,vmmppcr31(r5) lwz r17,vmmppccr(r5) lwz r18,vmmppcxer(r5) lwz r19,vmmppclr(r5) lwz r20,vmmppcctr(r5) lwz r22,vmmppcvrsave(r5) stw r7,vmmppcr30(r5) ; Write context stw r8,vmmppcr31(r5) stw r9,vmmppccr(r5) stw r10,vmmppcxer(r5) stw r11,vmmppclr(r5) stw r12,vmmppcctr(r5) stw r14,vmmppcvrsave(r5) stw r15,saver30(r30) ; Write vm context stw r24,saver31(r30) stw r17,savecr(r30) stw r18,savexer(r30) stw r19,savelr(r30) stw r20,savectr(r30) stw r22,savevrsave(r30) ; Swap 8 registers lwz r7,savevscr+0(r30) ; Read savearea lwz r8,savevscr+4(r30) lwz r9,savevscr+8(r30) lwz r10,savevscr+12(r30) lwz r11,savefpscrpad(r30) lwz r12,savefpscr(r30) lwz r15,vmmppcvscr+0(r5) ; Read vm context lwz r24,vmmppcvscr+4(r5) lwz r17,vmmppcvscr+8(r5) lwz r18,vmmppcvscr+12(r5) lwz r19,vmmppcfpscrpad(r5) lwz r20,vmmppcfpscr(r5) stw r7,vmmppcvscr+0(r5) ; Write context stw r8,vmmppcvscr+4(r5) stw r9,vmmppcvscr+8(r5) stw r10,vmmppcvscr+12(r5) stw r11,vmmppcfpscrpad(r5) stw r12,vmmppcfpscr(r5) stw r15,savevscr+0(r30) ; Write vm context stw r24,savevscr+4(r30) stw r17,savevscr+8(r30) stw r18,savevscr+12(r30) stw r19,savefpscrpad(r30) stw r20,savefpscr(r30) ; ; Cobble up the exception return code and save any specific return values ; lwz r7,saveexception(r30) ; Pick up the exception code rlwinm r8,r7,30,24,31 ; Convert exception to return code cmplwi r7,T_DATA_ACCESS ; Was this a DSI? stw r8,return_code(r5) ; Save the exit code cmplwi cr1,r7,T_INSTRUCTION_ACCESS ; Exiting because of an ISI? beq+ swapDSI ; Yeah... cmplwi r7,T_ALIGNMENT ; Alignment exception? beq+ cr1,swapISI ; We had an ISI... cmplwi cr1,r7,T_SYSTEM_CALL ; Exiting because of an system call? beq+ swapDSI ; An alignment exception looks like a DSI... beq+ cr1,swapSC ; We had a system call... blr ; Return... ; ; Set exit returns for a DSI or alignment exception ; swapDSI: lwz r10,savedar(r30) ; Get the DAR lwz r7,savedsisr(r30) ; and the DSISR stw r10,return_params+0(r5) ; Save DAR as first return parm stw r7,return_params+4(r5) ; Save DSISR as second return parm blr ; Return... ; ; Set exit returns for a ISI ; swapISI: lwz r7,vmmppcmsr(r5) ; Get the SRR1 value lwz r10,vmmppcpc(r5) ; Get the PC as failing address rlwinm r7,r7,0,1,4 ; Save the bits that match the DSISR stw r10,return_params+0(r5) ; Save PC as first return parm stw r7,return_params+4(r5) ; Save the pseudo-DSISR as second return parm blr ; Return... ; ; Set exit returns for a system call (note: we did the first 3 earlier) ; Do we really need to pass parameters back here???? ; swapSC: lwz r10,vmmppcr6(r5) ; Get the fourth paramter stw r10,return_params+12(r5) ; Save it blr ; Return...