/* * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. The rights granted to you under the License * may not be used to create, or enable the creation or redistribution of, * unlawful or unlicensed copies of an Apple operating system, or to * circumvent, violate, or enable the circumvention or violation of, any * terms of an Apple operating system software license agreement. * * Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this file. * * The 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, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /* Emulate.s Emulate instructions and traps. Lovingly crafted by Bill Angell using traditional methods and only natural or recycled materials. No animal products are used other than rendered otter bile and deep fried pork lard. */ #include #include #include #include #include #include #define traceInst 30 #define dssAllDone 29 ; General stuff what happens here: ; 1) All general context saved, interrupts off, translation off ; 2) Vector and floating point disabled, but there may be live context. ; This code is responsible for saving and restoring what is used. This ; includes exception states, java mode, etc. ; 3) No attempt is made to resolve page faults. PTE misses are handled ; automatically, but actual faults (ala copyin/copyout) are not. If ; a fault does occur, the exception that caused entry to the emulation ; routine is remapped to either an instruction or data miss (depending ; upon the stage detected) and redrived through the exception handler. ; The only time that an instruction fault can happen is when a different ; processor removes a mapping between our original fault and when we ; fetch the assisted instruction. For an assisted instruction, data ; faults should not occur (except in the MP case). For a purely ; emulated instruction, faults can occur. ; ; .align 5 .globl EXT(Emulate) LEXT(Emulate) bf-- pf64Bitb,emn64 ; Skip if not 64-bit b EXT(Emulate64) ; Jump to the 64-bit code... emn64: mfsprg r31,0 ; Get the per_proc lwz r12,savesrr1+4(r13) ; Get the exception info rlwinm. r0,r12,0,SRR1_PRG_ILL_INS_BIT,SRR1_PRG_ILL_INS_BIT ; Emulation candidate? lwz r30,dgFlags(0) ; Get the flags beq+ eExit ; Nope, do not try to emulate... rlwinm. r0,r30,0,enaDiagEMb,enaDiagEMb ; Do we want to try to emulate something? mfsprg r28,2 ; Get the processor features beq+ eExit ; No emulation allowed... rlwinm. r28,r28,0,pfAltivecb,pfAltivecb ; Do we have Altivec on this machine? beq eNoVect ; Nope, no Altivec... dssall ; We need to kill streams because we are going to flip to problem state sync eNoVect: bl eIFetch ; Get the instruction image bne- eRedriveAsISI ; Go redrive this as an ISI... rlwinm. r0,r10,0,0,5 ; See if we have the "special" op code here rlwinm r20,r10,16,22,31 ; Set rS/rD and rA bne+ eExit ; Not special op, ignore... rlwinm r0,r10,31,22,31 ; Extract the sub op code crclr cr1_eq ; Clear rlwimi r20,r10,14,15,16 ; Move bits 29 and 30 of instruction to 15 and 16 of DSISR cmplwi r0,790 ; lhbrx? rlwimi r20,r10,8,17,17 ; Move bit 25 to bit 17 cror cr1_eq,cr1_eq,cr0_eq ; Remember cmplwi r0,534 ; lwbrx? rlwimi r20,r10,3,18,21 ; Move bit 21-24 to bit 18-21 cror cr1_eq,cr1_eq,cr0_eq ; Remember cmplwi r0,918 ; sthbrx? cror cr1_eq,cr1_eq,cr0_eq ; Remember cmplwi r0,662 ; stwbrx? cror cr1_eq,cr1_eq,cr0_eq ; Remember cmplwi r0,1014 ; dcbz? cror cr1_eq,cr1_eq,cr0_eq ; Remember cmplwi r0,533 ; lswx? cror cr1_eq,cr1_eq,cr0_eq ; Remember cmplwi r0,661 ; stswx? cror cr1_eq,cr1_eq,cr0_eq ; Remember bne cr1_eq,eNotIndex ; Go check non-index forms... rlwinm. r21,r10,19,24,28 ; Extract index to rA to build EA rlwinm r22,r10,24,24,28 ; Extract index to rB addi r24,r13,saver0+4 ; Point to the start of registers li r19,0 ; Assume 0 base beq eZeroBase ; Yes... lwzx r19,r24,r21 ; Get the base register value eZeroBase: lwzx r22,r24,r22 ; Get the index value add r22,r22,r19 ; Get DAR b eFinishUp ; Done, go finish up... eNotIndex: cmplwi r0,725 ; stswi? cror cr1_eq,cr1_eq,cr0_eq ; Remember cmplwi r0,597 ; lswi? cror cr1_eq,cr1_eq,cr0_eq ; Remember bne cr1,eExit ; Not one we handle... rlwinm. r21,r10,19,24,28 ; Extract index to rA to build EA addi r24,r13,saver0+4 ; Point to the start of registers li r22,0 ; Assume 0 base beq eFinishUp ; Yes, it is... lwzx r22,r24,r21 ; Get the base register value eFinishUp: stw r20,savedsisr(r13) ; Set the DSISR li r11,T_ALIGNMENT ; Get the exception code stw r22,savedar+4(r13) ; Save the DAR stw r11,saveexception(r13) ; Set the exception code b EXT(AlignAssist) ; Go emulate the handler... eExit: b EXT(EmulExit) ; Just return for now... ; ; Fetch the failing instruction. ; Image returned in R10 if CR0_EQ is false, otherwise, an ISI should be generated/ ; The cr bit kernAccess is set if this was a kernel access. ; R1 has the DSISR if access failed. ; .align 5 eIFetch: lwz r23,savesrr1+4(r13) ; Get old MSR mflr r28 ; Save return rlwinm. r22,r23,0,MSR_PR_BIT,MSR_PR_BIT ; Within kernel? mfmsr r30 ; Save the MSR for now lwz r23,savesrr0+4(r13) ; Get instruction address ori r22,r30,lo16(MASK(MSR_DR)|MASK(MSR_RI)) ; Set RI and DR onto access MSR crset cr0_eq ; Set this to see if we failed mtmsr r22 ; Flip DR, RI, and maybe PR on isync lwz r10,0(r23) ; Fetch the instruction mtmsr r30 ; Trans and RI off isync mtlr r28 ; Restore the LR blr ; Return with instruction image in R10 ; ; Redrive as an ISI ; eRedriveAsISI: lwz r6,savesrr1+4(r13) ; Get the srr1 value lwz r4,SAVflags(r13) ; Pick up the flags li r11,T_INSTRUCTION_ACCESS ; Set failing instruction fetch code rlwimi r6,r1,0,0,4 ; Move the DSISR bits to the SRR1 oris r4,r4,hi16(SAVredrive) ; Set the redrive bit stw r11,saveexception(r13) ; Set the replacement code stw r4,SAVflags(r13) ; Set redrive request stw r6,savesrr1+4(r13) ; Set the srr1 value b EXT(EmulExit) ; Bail out to handle ISI... ; ; This code emulates instructions that have failed because of operand ; alignment. We decode the DSISR to figure out what we need to do. ; ; DSISR: ; 0001FC00 - Instruction designation #define iFloat 12 #define iOptype1 15 #define iOptype2 16 #define iOptype3 18 #define iOptype4 19 #define iUpdate 17 #define iStore 20 #define iDouble 21 #define iNotify 22 ; 000003E0 - Target/Source register ; 0000001F - Register to update if update form ; .align 5 .globl EXT(AlignAssist) LEXT(AlignAssist) bf-- pf64Bitb,aan64 ; Skip if not 64-bit b EXT(AlignAssist64) ; Jump to the 64-bit code... aan64: lwz r20,savedsisr(r13) ; Get the DSISR li r0,0 ; Assume we emulate mfsprg r31,0 ; Get the per_proc mtcrf 0x10,r20 ; Put instruction ID in CR for later lwz r21,spcFlags(r31) ; Grab the special flags stw r0,savemisc3(r13) ; Assume that we emulate ok mtcrf 0x08,r20 ; Put instruction ID in CR for later rlwinm. r0,r21,0,runningVMbit,runningVMbit ; Are we running a VM? mtcrf 0x04,r20 ; Put instruction ID in CR for later lwz r22,savesrr1+4(r13) ; Get the SRR1 bne- aaPassAlong ; We are in a VM, no emulation for alignment exceptions... lwz r19,dgFlags(0) ; Get the diagnostics flags crxor iFloat,iOptype1,iOptype2 ; Set this to 0 if both bits are either 0 or 1 mr r26,r20 ; Save the DSISR rlwinm. r0,r22,0,MSR_SE_BIT,MSR_SE_BIT ; Were we single stepping? lwz r23,savedar+4(r13) ; Pick up the address that we want to access crnot traceInst,cr0_eq ; Remember if trace is on rlwinm. r0,r19,0,enaNotifyEMb,enaNotifyEMb ; Should we notify that an alignment exception happened? mfmsr r30 ; Save the MSR for now crnot iNotify,cr0_eq ; Remember to tell someone we did this li r29,emfp0 ; Point to work area crxor iFloat,iFloat,iOptype3 ; Set true if we have a floating point instruction dcbz r29,r31 ; Clear and allocate a cache line for us to work in rlwinm r24,r20,3,24,28 ; Get displacement to register to update if update form rlwimi r20,r20,24,28,28 ; Move load/store indication to the bottom of index ori r22,r30,lo16(MASK(MSR_DR)|MASK(MSR_RI)) ; Set RI onto access MSR rlwimi r20,r20,26,27,27 ; Move single/double indication to just above the bottom lis r29,hi16(EXT(aaFPopTable)) ; High part of FP branch table bf- iFloat,aaNotFloat ; This is not a floating point instruction... ori r29,r29,lo16(EXT(aaFPopTable)) ; Low part of FP branch table rlwimi r29,r20,0,22,28 ; Index into table based upon register||iDouble||iStore mtctr r29 ; Get set to call the function bt iStore,aaFPstore ; This is an FP store... ; ; Here we handle floating point loads ; aaFPload: crset cr0_eq ; Set this to see if we failed mtmsr r22 ; Flip DR, RI isync lwz r10,0(r23) ; Get the first word bf- cr0_eq,aaLdNotDbl ; Jump out if we DSIed... bf iDouble,aaLdNotDbl ; this is not a double... lwz r11,4(r23) ; Get the second half aaLdNotDbl: mr r4,r0 ; Save the DAR if we failed the access mtmsr r30 ; Turn off translation again isync bf- cr0_eq,aaRedriveAsDSI ; Go redrive this as a DSI... stw r10,emfp0(r31) ; Save the first half stw r11,emfp0+4(r31) ; Save the second half, just in case we need it bctrl ; Go set the target FP register b aaComExit ; All done, go exit... ; ; Here we handle floating point stores ; .align 5 aaFPstore: bctrl ; Go save the source FP register lwz r10,emfp0(r31) ; Get first word crandc iDouble,iDouble,iOptype4 ; Change to 4-byte access if stfiwx lwz r11,emfp0+4(r31) ; and the second bf+ iOptype4,aaNotstfiwx ; This is not a stfiwx... mr r10,r11 ; The stfiwx wants to store the second half aaNotstfiwx: crset cr0_eq ; Set this to see if we failed mtmsr r22 ; Flip DR, RI isync stw r10,0(r23) ; Save the first word bf- cr0_eq,aaStNotDbl ; Jump out if we DSIed... bf iDouble,aaStNotDbl ; this is not a double... stw r11,4(r23) ; Save the second half aaStNotDbl: mr r4,r0 ; Save the DAR if we failed the access mtmsr r30 ; Turn off isync bf- cr0_eq,aaRedriveAsDSI ; Go redrive this as a DSI... ; ; Common exit routines ; aaComExit: lwz r10,savesrr0+4(r13) ; Get the failing instruction address add r24,r24,r13 ; Offset to update register li r11,T_IN_VAIN ; Assume we are all done addi r10,r10,4 ; Step to the next instruction bf iUpdate,aaComExNU ; Skip if not an update form... stw r23,saver0+4(r24) ; Update the target aaComExNU: lwz r9,SAVflags(r13) ; Get the flags stw r10,savesrr0+4(r13) ; Set new PC bt- traceInst,aaComExitrd ; We are tracing, go emulate trace... bf+ iNotify,aaComExGo ; Nothing special here, go... li r11,T_ALIGNMENT ; Set the we just did an alignment exception.... aaComExGo: b EXT(EmulExit) ; We are done, no tracing on... ; ; This is not a floating point operation ; ; The table of these emulation routines is indexed by taking the low order 4 bits of ; the instruction code in the DSISR and subtracting 7. If this comes up negative, ; the instruction is not to be emulated. Then we add bit 0 of the code * 4. This ; gives us a fairly compact and almost unique index. Both lwm and stmw map to 0 so ; that one needs to be further reduced, and we end up with holes at a few indexes. ; .align 5 aaNotFloat: lis r19,hi16(aaEmTable) ; Point to high part of table address rlwinm r3,r26,24,26,29 ; Isolate last 4 bits of op type * 4 rlwimi r19,r26,20,27,27 ; Get bit 0 of instruction code * 4 into bottom of table base addic. r3,r3,-28 ; Subtract 7*4 to adjust index ori r19,r19,lo16(aaEmTable) ; Low part of table address blt- aaPassAlong ; We do not handle any of these (lwarx, stwcx., eciwx, ecowx)... add r19,r19,r3 ; Point to emulation routine rlwinm r18,r26,30,24,28 ; Get the target/source register displacement mtctr r19 ; Set the routine address bctr ; Go emulate the instruction... ; ; This is the table of non-floating point emulation routines. ; It is indexed by the code immediately above. .align 5 aaEmTable: b aaLmwStmw ; This for lmw/stmw b aaLswx ; This for lwwx b aaLswi ; This for lswi b aaStswx ; This for stswx b aaStswi ; This for stswi b aaLwbrx ; This for lwbrx b aaPassAlong ; This an invalid index (6) b aaStwbrx ; This for stwbrx b aaPassAlong ; This an invalid index (8) b aaLhbrx ; This for lhbrx b aaPassAlong ; This an invalid index (A) b aaSthbrx ; This for sthbrx b aaDcbz ; This for dcbz b aaPassAlong ; This an invalid index (D) b aaPassAlong ; This an invalid index (E) b aaPassAlong ; This an invalid index (F) ; ; Here we handle the set up for the lmw and stmw. After that, we split off to the ; individual routines. ; ; Note also that after some set up, all of the string instructions come through here as well. ; .align 5 aaLmwStmw: rlwinm r17,r18,31,1,29 ; Convert doublword based index to words li r28,0 ; Set no extra bytes to move (used for string instructions) subfic r17,r17,32*4 ; Calculate the length of the transfer aaLSComm: addi r19,r13,saver0+4 ; Offset to registers in savearea mr r16,r23 ; Make a hunk pointer bt iUpdate,aaStmw ; This is the stmw... ; ; Load multiple word ; aaLmwNxt: cmplwi cr1,r17,8*4 ; Is there enough to move 8? blt- cr1,aaLmwNxtH ; Not enough for a full hunk... subi r17,r17,8*4 ; Back off for another hunk crset cr0_eq ; Set this to see if we failed mtmsr r22 ; Flip DR, RI isync lwz r2,0(r16) ; Load word 0 bf- cr0_eq,aaLmwB1 ; Error, bail... lwz r15,4(r16) ; Load word 1 bf- cr0_eq,aaLmwB1 ; Error, bail... lwz r14,8(r16) ; Load word 2 bf- cr0_eq,aaLmwB1 ; Error, bail... lwz r5,12(r16) ; Load word 3 bf- cr0_eq,aaLmwB1 ; Error, bail... lwz r6,16(r16) ; Load word 4 bf- cr0_eq,aaLmwB1 ; Error, bail... lwz r7,20(r16) ; Load word 5 bf- cr0_eq,aaLmwB1 ; Error, bail... lwz r8,24(r16) ; Load word 6 bf- cr0_eq,aaLmwB1 ; Error, bail... lwz r9,28(r16) ; Load word 7 aaLmwB1: mr r4,r0 ; Remember DAR, jus in case we failed the access mtmsr r30 ; Turn off DR, RI isync bf- cr0_eq,aaRedriveAsDSI ; We failed, go redrive this as a DSI... addi r16,r16,8*4 ; Point up to next input aread stwx r2,r19,r18 ; Store register addi r18,r18,8 ; Next register rlwinm r18,r18,0,24,28 ; Wrap back to 0 if needed stwx r15,r19,r18 ; Store register addi r18,r18,8 ; Next register rlwinm r18,r18,0,24,28 ; Wrap back to 0 if needed stwx r14,r19,r18 ; Store register addi r18,r18,8 ; Next register rlwinm r18,r18,0,24,28 ; Wrap back to 0 if needed stwx r5,r19,r18 ; Store register addi r18,r18,8 ; Next register rlwinm r18,r18,0,24,28 ; Wrap back to 0 if needed stwx r6,r19,r18 ; Store register addi r18,r18,8 ; Next register rlwinm r18,r18,0,24,28 ; Wrap back to 0 if needed stwx r7,r19,r18 ; Store register addi r18,r18,8 ; Next register rlwinm r18,r18,0,24,28 ; Wrap back to 0 if needed stwx r8,r19,r18 ; Store register addi r18,r18,8 ; Next register rlwinm r18,r18,0,24,28 ; Wrap back to 0 if needed stwx r9,r19,r18 ; Store register addi r18,r18,8 ; Next register rlwinm r18,r18,0,24,28 ; Wrap back to 0 if needed b aaLmwNxt ; Do the next hunk... .align 5 aaLmwNxtH: cmplwi cr1,r17,4*4 ; Do we have 4 left? blt cr1,aaLmwL4 ; Nope... subi r17,r17,4*4 ; Set count properly crset cr0_eq ; Set this to see if we failed mtmsr r22 ; Flip DR, RI, and maybe PR on isync lwz r2,0(r16) ; Load word 0 bf- cr0_eq,aaLmwB2 ; Error, bail... lwz r15,4(r16) ; Load word 1 bf- cr0_eq,aaLmwB2 ; Error, bail... lwz r14,8(r16) ; Load word 2 bf- cr0_eq,aaLmwB2 ; Error, bail... lwz r5,12(r16) ; Load word 3 aaLmwB2: mr r4,r0 ; Remember DAR, jus in case we failed the access mtmsr r30 ; Turn off DR, RI isync bf- cr0_eq,aaRedriveAsDSI ; We failed, go redrive this as a DSI... addi r16,r16,4*4 ; Point up to next input aread stwx r2,r19,r18 ; Store register addi r18,r18,8 ; Next register rlwinm r18,r18,0,24,28 ; Wrap back to 0 if needed stwx r15,r19,r18 ; Store register addi r18,r18,8 ; Next register rlwinm r18,r18,0,24,28 ; Wrap back to 0 if needed stwx r14,r19,r18 ; Store register addi r18,r18,8 ; Next register rlwinm r18,r18,0,24,28 ; Wrap back to 0 if needed stwx r5,r19,r18 ; Store register addi r18,r18,8 ; Next register rlwinm r18,r18,0,24,28 ; Wrap back to 0 if needed aaLmwL4: or. r5,r17,r28 ; Do we have anything left? cmplwi cr1,r17,(2*4) ; Do we have one, two, or three full words left? cmplwi cr2,r17,0 ; Do we have no full words left? beq aaComExit ; Nothing left... crset cr0_eq ; Set this to see if we failed mtmsr r22 ; Flip DR, RI, and maybe PR on isync beq- cr2,aaLmwBy ; No full words, get bytes... lwz r2,0(r16) ; Pick up first word bf- cr0_eq,aaLmwDn ; Read failed, escape... addi r16,r16,4 ; Next input location blt cr1,aaLmwBy ; We only had one, we are done... lwz r15,0(r16) ; Pick up second word bf- cr0_eq,aaLmwDn ; Read failed, escape... addi r16,r16,4 ; Next input location beq cr1,aaLmwBy ; We had two, we are done... lwz r14,0(r16) ; Load word 3 addi r16,r16,4 ; Next input location aaLmwBy: cmplwi cr2,r28,0 ; Any trailing bytes to do? li r8,0 ; Clear second trailing byte cmplwi cr1,r28,2 ; Check for 1, 2, or 3 li r9,0 ; Clear third trailing byte beq+ cr2,aaLmwDn ; No trailing bytes... lbz r5,0(r16) ; Pick up first trailing byte bf- cr0_eq,aaLmwDn ; Read failed, escape... blt cr1,aaLmwDn ; We only had one, we are done... lbz r8,1(r16) ; Pick up second trailing byte bf- cr0_eq,aaLmwDn ; Read failed, escape... beq cr1,aaLmwDn ; We had two, we are done... lbz r9,2(r16) ; Get last trailing byte aaLmwDn: rlwinm r5,r5,24,0,7 ; Move first byte to top cmplwi cr2,r17,0 ; Any full words to do? mr r4,r0 ; Remember DAR, just in case we failed the access rlwimi r9,r8,8,16,23 ; Move second byte above third byte cmplwi cr1,r17,(2*4) ; Do we have one, two, or three full words left? mr r3,r30 ; Set the normal MSR rlwimi r5,r9,8,8,23 ; Move bytes 1 and 2 after 0 mtmsr r30 ; Turn off DR, RI isync bf- cr0_eq,aaRedriveAsDSI ; We failed, go redrive this as a DSI... beq- cr2,aaLmwCb ; No full words, copy bytes... stwx r2,r19,r18 ; Store register addi r18,r18,8 ; Next register rlwinm r18,r18,0,24,28 ; Wrap back to 0 if needed blt cr1,aaLmwCb ; We only had one, we are done... stwx r15,r19,r18 ; Store register addi r18,r18,8 ; Next register rlwinm r18,r18,0,24,28 ; Wrap back to 0 if needed beq cr1,aaLmwCb ; We had two, we are done... stwx r14,r19,r18 ; Store register addi r18,r18,8 ; Next register rlwinm r18,r18,0,24,28 ; Wrap back to 0 if needed aaLmwCb: mr. r28,r28 ; Any trailing bytes to do? beq+ aaComExit ; Nope, leave... stwx r5,r19,r18 ; Store register b aaComExit ; We are done.... ; ; Store multiple word ; .align 5 aaStmw: crclr iUpdate ; Make sure we do not think this is an update form aaStmwNxt: cmplwi cr1,r17,8*4 ; Is there enough to move 8? blt- cr1,aaStmwNxtH ; Not enough for a full hunk... subi r17,r17,8*4 ; Back off for another hunk lwzx r2,r19,r18 ; Store register addi r18,r18,8 ; Next register rlwinm r18,r18,0,24,28 ; Wrap back to 0 if needed lwzx r15,r19,r18 ; Store register addi r18,r18,8 ; Next register rlwinm r18,r18,0,24,28 ; Wrap back to 0 if needed lwzx r14,r19,r18 ; Store register addi r18,r18,8 ; Next register rlwinm r18,r18,0,24,28 ; Wrap back to 0 if needed lwzx r5,r19,r18 ; Store register addi r18,r18,8 ; Next register rlwinm r18,r18,0,24,28 ; Wrap back to 0 if needed lwzx r6,r19,r18 ; Store register addi r18,r18,8 ; Next register rlwinm r18,r18,0,24,28 ; Wrap back to 0 if needed lwzx r7,r19,r18 ; Store register addi r18,r18,8 ; Next register rlwinm r18,r18,0,24,28 ; Wrap back to 0 if needed lwzx r8,r19,r18 ; Store register addi r18,r18,8 ; Next register rlwinm r18,r18,0,24,28 ; Wrap back to 0 if needed lwzx r9,r19,r18 ; Store register addi r18,r18,8 ; Next register rlwinm r18,r18,0,24,28 ; Wrap back to 0 if needed crset cr0_eq ; Set this to see if we failed mtmsr r22 ; Flip DR, RI, and maybe PR on isync stw r2,0(r16) ; Store word 0 bf- cr0_eq,aaStmwB1 ; Error, bail... stw r15,4(r16) ; Store word 1 bf- cr0_eq,aaStmwB1 ; Error, bail... stw r14,8(r16) ; Store word 2 bf- cr0_eq,aaStmwB1 ; Error, bail... stw r5,12(r16) ; Store word 3 bf- cr0_eq,aaStmwB1 ; Error, bail... stw r6,16(r16) ; Store word 4 bf- cr0_eq,aaStmwB1 ; Error, bail... stw r7,20(r16) ; Store word 5 bf- cr0_eq,aaStmwB1 ; Error, bail... stw r8,24(r16) ; Store word 6 bf- cr0_eq,aaStmwB1 ; Error, bail... stw r9,28(r16) ; Store word 7 addi r16,r16,8*4 ; Point up to next output aread aaStmwB1: mr r4,r0 ; Remember DAR, jus in case we failed the access mtmsr r30 ; Normal MSR isync bt- cr0_eq,aaStmwNxt ; We have more to do and no failed access... b aaRedriveAsDSI ; We failed, go redrive this as a DSI... .align 5 aaStmwNxtH: cmplwi cr1,r17,(4*4) ; Do we have at least 4 left? blt cr1,aaStmwL4 ; Nope... subi r17,r17,4*4 ; Set count properly lwzx r2,r19,r18 ; Store register addi r18,r18,8 ; Next register rlwinm r18,r18,0,24,28 ; Wrap back to 0 if needed lwzx r15,r19,r18 ; Store register addi r18,r18,8 ; Next register rlwinm r18,r18,0,24,28 ; Wrap back to 0 if needed lwzx r14,r19,r18 ; Store register addi r18,r18,8 ; Next register rlwinm r18,r18,0,24,28 ; Wrap back to 0 if needed lwzx r5,r19,r18 ; Store register addi r18,r18,8 ; Next register rlwinm r18,r18,0,24,28 ; Wrap back to 0 if needed crset cr0_eq ; Set this to see if we failed mtmsr r22 ; Flip DR, RI isync stw r2,0(r16) ; Store word 0 bf- cr0_eq,aaStmwB2 ; Error, bail... stw r15,4(r16) ; Store word 1 bf- cr0_eq,aaStmwB2 ; Error, bail... stw r14,8(r16) ; Store word 2 bf- cr0_eq,aaStmwB2 ; Error, bail... stw r5,12(r16) ; Store word 3 addi r16,r16,4*4 ; Point up to next input aread aaStmwB2: mr r4,r0 ; Remember DAR, jus in case we failed the access mtmsr r30 ; Normal MSR isync bf- cr0_eq,aaRedriveAsDSI ; We failed, go redrive this as a DSI... aaStmwL4: or. r5,r17,r28 ; Do we have anything left to do? cmplwi cr1,r17,(2*4) ; Do we have one, two, or three left? cmplwi cr2,r17,0 ; Do we have no full words left? beq aaComExit ; Nothing left... beq- cr2,aaStmwBy1 ; No full words, check out bytes lwzx r2,r19,r18 ; Store register addi r18,r18,8 ; Next register rlwinm r18,r18,0,24,28 ; Wrap back to 0 if needed blt cr1,aaStmwBy1 ; We only had one, go save it... lwzx r15,r19,r18 ; Store register addi r18,r18,8 ; Next register rlwinm r18,r18,0,24,28 ; Wrap back to 0 if needed beq cr1,aaStmwBy1 ; We had two, go save it... lwzx r14,r19,r18 ; Store register addi r18,r18,8 ; Next register rlwinm r18,r18,0,24,28 ; Wrap back to 0 if needed aaStmwBy1: mr. r28,r28 ; Do we have any trailing bytes? beq+ aaStmwSt ; Nope... lwzx r5,r19,r18 ; Yes, pick up one extra register aaStmwSt: crset cr0_eq ; Set this to see if we failed mtmsr r22 ; Flip DR, RI isync beq- cr2,aaStmwBy2 ; No words, check trailing bytes... stw r2,0(r16) ; Save first word bf- cr0_eq,aaStmwDn ; Store failed, escape... addi r16,r16,4 ; Bump sink blt cr1,aaStmwBy2 ; We only had one, we are done... stw r15,0(r16) ; Save second word bf- cr0_eq,aaStmwDn ; Store failed, escape... addi r16,r16,4 ; Bump sink beq cr1,aaStmwBy2 ; We had two, we are done... stw r14,0(r16) ; Save third word bf- cr0_eq,aaStmwDn ; Store failed, escape... addi r16,r16,4 ; Bump sink aaStmwBy2: rlwinm r2,r5,8,24,31 ; Get byte 0 cmplwi cr2,r28,0 ; Any trailing bytes to do? rlwinm r14,r5,24,24,31 ; Get byte 3 li r8,0 ; Clear second trailing byte cmplwi cr1,r28,2 ; Check for 1, 2, or 3 li r9,0 ; Clear third trailing byte beq+ cr2,aaStmwDn ; No trailing bytes... rlwinm r15,r5,16,24,31 ; Get byte 1 stb r2,0(r16) ; Save first byte bf- cr0_eq,aaStmwDn ; Read failed, escape... blt cr1,aaStmwDn ; We only had one, we are done... stb r15,1(r16) ; Save second byte bf- cr0_eq,aaStmwDn ; Read failed, escape... beq cr1,aaStmwDn ; We had two, we are done... stb r14,2(r16) ; Save third byte aaStmwDn: mr r4,r0 ; Remember DAR, jus in case we failed the access mtmsr r30 ; Normal MSR isync bf- cr0_eq,aaRedriveAsDSI ; We failed, go redrive this as a DSI... b aaComExit ; We are done.... ; ; Load String Indexed ; .align 5 aaLswx: lwz r17,savexer+4(r13) ; Pick up the XER crclr iUpdate ; Make sure we think this the load form rlwinm. r25,r17,0,25,31 ; Get the number of bytes to load rlwinm r28,r17,0,30,31 ; Get the number of bytes past an even word beq- aaComExit ; Do nothing if 0 length... xor r17,r25,r28 ; Round down to an even word boundary b aaLSComm ; Join up with common load/store code... ; ; Load String Immediate ; .align 5 aaLswi: mr r9,r23 ; Save the DAR bl eIFetch ; Get the instruction image bne- eRedriveAsISI ; Go redrive this as an ISI... rlwinm r25,r10,21,27,31 ; Get the number of bytes to load crclr iUpdate ; Make sure we think this the load form subi r25,r25,1 ; Back off by 1 rlwinm r25,r25,0,27,31 ; Clear back down addi r25,r25,1 ; Add back the 1 to convert 0 to 32 rlwinm r28,r25,0,30,31 ; Get the number of bytes past an even word xor r17,r25,r28 ; Round down to an even word boundary mr r23,r9 ; Move back the DAR b aaLSComm ; Join up with common load/store code... ; ; Store String Indexed ; .align 5 aaStswx: lwz r17,savexer+4(r13) ; Pick up the XER crclr iUpdate ; Make sure this is clear in case we have 0 length rlwinm. r25,r17,0,25,31 ; Get the number of bytes to load rlwinm r28,r17,0,30,31 ; Get the number of bytes past an even word beq- aaComExit ; Do nothing if 0 length... xor r17,r25,r28 ; Round down to an even word boundary crset iUpdate ; Make sure we think this the store form b aaLSComm ; Join up with common load/store code... ; ; Store String Immediate ; .align 5 aaStswi: mr r9,r23 ; Save the DAR bl eIFetch ; Get the instruction image bne- eRedriveAsISI ; Go redrive this as an ISI... rlwinm r25,r10,21,27,31 ; Get the number of bytes to load crclr iUpdate ; Make sure we think this the load form subi r25,r25,1 ; Back off by 1 rlwinm r25,r25,0,27,31 ; Clear back down addi r25,r25,1 ; Add back the 1 to convert 0 to 32 rlwinm r28,r25,21,30,31 ; Get the number of bytes past an even word xor r17,r25,r28 ; Round down to an even word boundary mr r23,r9 ; Move back the DAR b aaLSComm ; Join up with common load/store code... ; ; Load byte-reversed word ; .align 5 aaLwbrx: add r18,r18,r13 ; Index to source register crset cr0_eq ; Set this to see if we failed mtmsr r22 ; Flip DR, RI, and maybe PR on isync lwz r11,0(r23) ; Load the word mr r4,r0 ; Save the DAR if we failed the access mtmsr r30 ; Restore normal MSR isync bf- cr0_eq,aaRedriveAsDSI ; We failed, go redrive this as a DSI... rlwinm r10,r11,8,0,31 ; Get byte 0 to 3 and byte 2 to 1 rlwimi r10,r11,24,16,23 ; Move byte 1 to byte 2 rlwimi r10,r11,24,0,7 ; Move byte 3 to byte 0 stw r10,saver0+4(r18) ; Set the register b aaComExit ; All done, go exit... ; ; Store byte-reversed word ; .align 5 aaStwbrx: add r18,r18,r13 ; Index to source register lwz r11,saver0+4(r18) ; Get the register to store rlwinm r10,r11,8,0,31 ; Get byte 0 to 3 and byte 2 to 1 rlwimi r10,r11,24,16,23 ; Move byte 1 to byte 2 rlwimi r10,r11,24,0,7 ; Move byte 3 to byte 0 crset cr0_eq ; Set this to see if we failed mtmsr r22 ; Flip DR, RI, and maybe PR on isync stw r10,0(r23) ; Store the reversed halfword mr r4,r0 ; Save the DAR if we failed the access mtmsr r30 ; Restore normal MSR isync bt+ cr0_eq,aaComExit ; All done, go exit... b aaRedriveAsDSI ; We failed, go redrive this as a DSI... ; ; Load byte-reversed halfword ; .align 5 aaLhbrx: add r18,r18,r13 ; Index to source register crset cr0_eq ; Set this to see if we failed mtmsr r22 ; Flip DR, RI, and maybe PR on isync lhz r11,0(r23) ; Load the halfword mr r4,r0 ; Save the DAR if we failed the access mtmsr r30 ; Restore normal MSR isync bf- cr0_eq,aaRedriveAsDSI ; We failed, go redrive this as a DSI... rlwinm r10,r11,8,16,23 ; Rotate bottom byte up one and clear everything else rlwimi r10,r11,24,24,31 ; Put old second from bottom into bottom stw r10,saver0+4(r18) ; Set the register b aaComExit ; All done, go exit... ; ; Store byte-reversed halfword ; .align 5 aaSthbrx: add r18,r18,r13 ; Index to source register lwz r10,saver0+4(r18) ; Get the register to store rlwinm r10,r10,8,0,31 ; Rotate bottom byte up one rlwimi r10,r10,16,24,31 ; Put old second from bottom into bottom crset cr0_eq ; Set this to see if we failed mtmsr r22 ; Flip DR, RI, and maybe PR on isync sth r10,0(r23) ; Store the reversed halfword mr r4,r0 ; Save the DAR if we failed the access mtmsr r30 ; Restore normal MSR isync bt+ cr0_eq,aaComExit ; All done, go exit... b aaRedriveAsDSI ; We failed, go redrive this as a DSI... ; ; Data cache block zero ; .align 5 aaDcbz: lwz r0,savesrr0+4(r13) ; get instruction address li r4,_COMM_PAGE_BASE_ADDRESS rlwinm r23,r23,0,0,26 ; Round EA back to a 32-byte boundary sub r4,r0,r4 ; compute instruction offset from base of commpage cmplwi r4,_COMM_PAGE_AREA_USED ; did fault occur in commpage? bge+ aaDcbz1 ; skip if not in commpage lwz r4,savecr(r13) ; if we take a dcbz in the commpage... rlwinm r4,r4,0,0,27 ; ...clear users cr7 as a flag for commpage code stw r4,savecr(r13) aaDcbz1: crset cr0_eq ; Set this to see if we failed li r0,0 ; Clear this out mtmsr r22 ; Flip DR, RI, and maybe PR on isync stw r0,0(r23) ; Clear word bne- aaDcbzXit ; Got DSI, we are stopping... stw r0,4(r23) ; Clear word bne- aaDcbzXit ; Got DSI, we are stopping... stw r0,8(r23) ; Clear word bne- aaDcbzXit ; Got DSI, we are stopping... stw r0,12(r23) ; Clear word bne- aaDcbzXit ; Got DSI, we are stopping... stw r0,16(r23) ; Clear word bne- aaDcbzXit ; Got DSI, we are stopping... stw r0,20(r23) ; Clear word bne- aaDcbzXit ; Got DSI, we are stopping... stw r0,24(r23) ; Clear word bne- aaDcbzXit ; Got DSI, we are stopping... stw r0,28(r23) ; Clear word aaDcbzXit: mr r4,r0 ; Save the DAR if we failed the access mtmsr r30 ; Restore normal MSR isync crclr iUpdate ; Make sure we do not think this is an update form bt+ cr0_eq,aaComExit ; All done, go exit... b aaRedriveAsDSI ; We failed, go redrive this as a DSI... ; ; Unhandled alignment exception, pass it along ; aaPassAlong: li r0,1 ; Indicate that we failed to emulate stw r0,savemisc3(r13) ; Assume that we emulate ok b EXT(EmulExit) ; ; We go here to emulate a trace exception after we have handled alignment error ; .align 5 aaComExitrd: oris r9,r9,hi16(SAVredrive) ; Set the redrive bit li r11,T_TRACE ; Set trace interrupt rlwinm r12,r12,0,16,31 ; Clear top half of SRR1 stw r9,SAVflags(r13) ; Set the flags stw r11,saveexception(r13) ; Set the exception code b EXT(EmulExit) ; Exit and do trace interrupt... ; ; Redrive as a DSI aaRedriveAsDSI: mr r20,r1 ; Save the DSISR mr r21,r4 lwz r4,SAVflags(r13) ; Pick up the flags li r11,T_DATA_ACCESS ; Set failing data access code oris r4,r4,hi16(SAVredrive) ; Set the redrive bit stw r20,savedsisr(r13) ; Set the DSISR of failed access stw r21,savedar+4(r13) ; Set the address of the failed access stw r11,saveexception(r13) ; Set the replacement code stw r4,SAVflags(r13) ; Set redrive request b EXT(EmulExit) ; Bail out to handle ISI... ; ; Table of functions to load or store floating point registers ; This table is indexed reg||size||dir. That means that each ; like load/store pair (e.g., lfd f31/stfd f31) are within the same ; quadword, which is the current ifetch size. We expect most of the ; unaligned accesses to be part of copies, therefore, with this ; organization, we will save the ifetch of the store after the load. ; .align 10 ; Make sure we are on a 1k boundary .globl EXT(aaFPopTable) LEXT(aaFPopTable) lfs f0,emfp0(r31) ; Load single variant blr stfs f0,emfp0(r31) ; Store single variant blr lfd f0,emfp0(r31) ; Load double variant blr stfd f0,emfp0(r31) ; Store double variant blr lfs f1,emfp0(r31) ; Load single variant blr stfs f1,emfp0(r31) ; Store single variant blr lfd f1,emfp0(r31) ; Load double variant blr stfd f1,emfp0(r31) ; Store double variant blr lfs f2,emfp0(r31) ; Load single variant blr stfs f2,emfp0(r31) ; Store single variant blr lfd f2,emfp0(r31) ; Load double variant blr stfd f2,emfp0(r31) ; Store double variant blr lfs f3,emfp0(r31) ; Load single variant blr stfs f3,emfp0(r31) ; Store single variant blr lfd f3,emfp0(r31) ; Load double variant blr stfd f3,emfp0(r31) ; Store double variant blr lfs f4,emfp0(r31) ; Load single variant blr stfs f4,emfp0(r31) ; Store single variant blr lfd f4,emfp0(r31) ; Load double variant blr stfd f4,emfp0(r31) ; Store double variant blr lfs f5,emfp0(r31) ; Load single variant blr stfs f5,emfp0(r31) ; Store single variant blr lfd f5,emfp0(r31) ; Load double variant blr stfd f5,emfp0(r31) ; Store double variant blr lfs f6,emfp0(r31) ; Load single variant blr stfs f6,emfp0(r31) ; Store single variant blr lfd f6,emfp0(r31) ; Load double variant blr stfd f6,emfp0(r31) ; Store double variant blr lfs f7,emfp0(r31) ; Load single variant blr stfs f7,emfp0(r31) ; Store single variant blr lfd f7,emfp0(r31) ; Load double variant blr stfd f7,emfp0(r31) ; Store double variant blr lfs f8,emfp0(r31) ; Load single variant blr stfs f8,emfp0(r31) ; Store single variant blr lfd f8,emfp0(r31) ; Load double variant blr stfd f8,emfp0(r31) ; Store double variant blr lfs f9,emfp0(r31) ; Load single variant blr stfs f9,emfp0(r31) ; Store single variant blr lfd f9,emfp0(r31) ; Load double variant blr stfd f9,emfp0(r31) ; Store double variant blr lfs f10,emfp0(r31) ; Load single variant blr stfs f10,emfp0(r31) ; Store single variant blr lfd f10,emfp0(r31) ; Load double variant blr stfd f10,emfp0(r31) ; Store double variant blr lfs f11,emfp0(r31) ; Load single variant blr stfs f11,emfp0(r31) ; Store single variant blr lfd f11,emfp0(r31) ; Load double variant blr stfd f11,emfp0(r31) ; Store double variant blr lfs f12,emfp0(r31) ; Load single variant blr stfs f12,emfp0(r31) ; Store single variant blr lfd f12,emfp0(r31) ; Load double variant blr stfd f12,emfp0(r31) ; Store double variant blr lfs f13,emfp0(r31) ; Load single variant blr stfs f13,emfp0(r31) ; Store single variant blr lfd f13,emfp0(r31) ; Load double variant blr stfd f13,emfp0(r31) ; Store double variant blr lfs f14,emfp0(r31) ; Load single variant blr stfs f14,emfp0(r31) ; Store single variant blr lfd f14,emfp0(r31) ; Load double variant blr stfd f14,emfp0(r31) ; Store double variant blr lfs f15,emfp0(r31) ; Load single variant blr stfs f15,emfp0(r31) ; Store single variant blr lfd f15,emfp0(r31) ; Load double variant blr stfd f15,emfp0(r31) ; Store double variant blr lfs f16,emfp0(r31) ; Load single variant blr stfs f16,emfp0(r31) ; Store single variant blr lfd f16,emfp0(r31) ; Load double variant blr stfd f16,emfp0(r31) ; Store double variant blr lfs f17,emfp0(r31) ; Load single variant blr stfs f17,emfp0(r31) ; Store single variant blr lfd f17,emfp0(r31) ; Load double variant blr stfd f17,emfp0(r31) ; Store double variant blr lfs f18,emfp0(r31) ; Load single variant blr stfs f18,emfp0(r31) ; Store single variant blr lfd f18,emfp0(r31) ; Load double variant blr stfd f18,emfp0(r31) ; Store double variant blr lfs f19,emfp0(r31) ; Load single variant blr stfs f19,emfp0(r31) ; Store single variant blr lfd f19,emfp0(r31) ; Load double variant blr stfd f19,emfp0(r31) ; Store double variant blr lfs f20,emfp0(r31) ; Load single variant blr stfs f20,emfp0(r31) ; Store single variant blr lfd f20,emfp0(r31) ; Load double variant blr stfd f20,emfp0(r31) ; Store double variant blr lfs f21,emfp0(r31) ; Load single variant blr stfs f21,emfp0(r31) ; Store single variant blr lfd f21,emfp0(r31) ; Load double variant blr stfd f21,emfp0(r31) ; Store double variant blr lfs f22,emfp0(r31) ; Load single variant blr stfs f22,emfp0(r31) ; Store single variant blr lfd f22,emfp0(r31) ; Load double variant blr stfd f22,emfp0(r31) ; Store double variant blr lfs f23,emfp0(r31) ; Load single variant blr stfs f23,emfp0(r31) ; Store single variant blr lfd f23,emfp0(r31) ; Load double variant blr stfd f23,emfp0(r31) ; Store double variant blr lfs f24,emfp0(r31) ; Load single variant blr stfs f24,emfp0(r31) ; Store single variant blr lfd f24,emfp0(r31) ; Load double variant blr stfd f24,emfp0(r31) ; Store double variant blr lfs f25,emfp0(r31) ; Load single variant blr stfs f25,emfp0(r31) ; Store single variant blr lfd f25,emfp0(r31) ; Load double variant blr stfd f25,emfp0(r31) ; Store double variant blr lfs f26,emfp0(r31) ; Load single variant blr stfs f26,emfp0(r31) ; Store single variant blr lfd f26,emfp0(r31) ; Load double variant blr stfd f26,emfp0(r31) ; Store double variant blr lfs f27,emfp0(r31) ; Load single variant blr stfs f27,emfp0(r31) ; Store single variant blr lfd f27,emfp0(r31) ; Load double variant blr stfd f27,emfp0(r31) ; Store double variant blr lfs f28,emfp0(r31) ; Load single variant blr stfs f28,emfp0(r31) ; Store single variant blr lfd f28,emfp0(r31) ; Load double variant blr stfd f28,emfp0(r31) ; Store double variant blr lfs f29,emfp0(r31) ; Load single variant blr stfs f29,emfp0(r31) ; Store single variant blr lfd f29,emfp0(r31) ; Load double variant blr stfd f29,emfp0(r31) ; Store double variant blr lfs f30,emfp0(r31) ; Load single variant blr stfs f30,emfp0(r31) ; Store single variant blr lfd f30,emfp0(r31) ; Load double variant blr stfd f30,emfp0(r31) ; Store double variant blr lfs f31,emfp0(r31) ; Load single variant blr stfs f31,emfp0(r31) ; Store single variant blr lfd f31,emfp0(r31) ; Load double variant blr stfd f31,emfp0(r31) ; Store double variant blr