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|
/* $FreeBSD$ */
/* $NetBSD: trap_subr.S,v 1.20 2002/04/22 23:20:08 kleink Exp $ */
/*
* Copyright (C) 1995, 1996 Wolfgang Solfrank.
* Copyright (C) 1995, 1996 TooLs GmbH.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by TooLs GmbH.
* 4. The name of TooLs GmbH may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* NOTICE: This is not a standalone file. to use it, #include it in
* your port's locore.S, like so:
*
* #include <powerpc/powerpc/trap_subr.S>
*/
/*
* XXX Fake AST trap vector. This is here until we work out how to safely
* remove the AST code.
*/
#define EXC_AST 0x3000
.data
.align 4
astpending:
.long 0
/*
* Data used during primary/secondary traps/interrupts
*/
#define tempsave EXC_MCHK+0xe0 /* primary save area for trap handling */
#define disisave EXC_DSI+0xe0 /* primary save area for dsi/isi traps */
/*
* XXX Interrupt and spill stacks need to be per-CPU.
*/
.data
.align 4
intstk:
.space INTSTK /* interrupt stack */
GLOBAL(intr_depth)
.long -1 /* in-use marker */
.comm spillstk,SPILLSTK,8
/*
* This code gets copied to all the trap vectors
* (except ISI/DSI, ALI, the interrupts, and possibly the debugging
* traps when using IPKDB).
*/
.text
.globl _C_LABEL(trapcode),_C_LABEL(trapsize)
_C_LABEL(trapcode):
mtsprg 1,1 /* save SP */
stmw 28,tempsave(0) /* free r28-r31 */
mflr 28 /* save LR */
mfcr 29 /* save CR */
/* Test whether we already had PR set */
mfsrr1 31
mtcr 31
bc 4,17,1f /* branch if PSL_PR is clear */
mfsprg 31,0
lwz 1,PC_CURPCB(31)
addi 1,1,USPACE /* stack is top of user struct */
1:
bla s_trap
_C_LABEL(trapsize) = .-_C_LABEL(trapcode)
/*
* For ALI: has to save DSISR and DAR
*/
.globl _C_LABEL(alitrap),_C_LABEL(alisize)
_C_LABEL(alitrap):
mtsprg 1,1 /* save SP */
stmw 28,tempsave(0) /* free r28-r31 */
mfdar 30
mfdsisr 31
stmw 30,tempsave+16(0)
mflr 28 /* save LR */
mfcr 29 /* save CR */
/* Test whether we already had PR set */
mfsrr1 31
mtcr 31
bc 4,17,1f /* branch if PSL_PR is clear */
mfsprg 31,0
lwz 1,PC_CURPCB(31)
addi 1,1,USPACE /* stack is top of user struct */
1:
bla s_trap
_C_LABEL(alisize) = .-_C_LABEL(alitrap)
/*
* Similar to the above for DSI
* Has to handle BAT spills
* and standard pagetable spills
*/
.globl _C_LABEL(dsitrap),_C_LABEL(dsisize)
_C_LABEL(dsitrap):
stmw 28,disisave(0) /* free r28-r31 */
mfcr 29 /* save CR */
mfxer 30 /* save XER */
mtsprg 2,30 /* in SPRG2 */
mfsrr1 31 /* test kernel mode */
mtcr 31
bc 12,17,1f /* branch if PSL_PR is set */
mfdar 31 /* get fault address */
rlwinm 31,31,7,25,28 /* get segment * 8 */
/* get batu */
addis 31,31,_C_LABEL(battable)@ha
lwz 30,_C_LABEL(battable)@l(31)
mtcr 30
bc 4,30,1f /* branch if supervisor valid is
false */
/* get batl */
lwz 31,_C_LABEL(battable)+4@l(31)
/* We randomly use the highest two bat registers here */
mftb 28
andi. 28,28,1
bne 2f
mtdbatu 2,30
mtdbatl 2,31
b 3f
2:
mtdbatu 3,30
mtdbatl 3,31
3:
mfsprg 30,2 /* restore XER */
mtxer 30
mtcr 29 /* restore CR */
lmw 28,disisave(0) /* restore r28-r31 */
rfi /* return to trapped code */
1:
mflr 28 /* save LR */
bla s_dsitrap
_C_LABEL(dsisize) = .-_C_LABEL(dsitrap)
/*
* Dedicated MPC601 version of the above.
* Considers different BAT format and combined implementation
* (being addressed as I-BAT).
*/
.globl _C_LABEL(dsitrap601),_C_LABEL(dsi601size)
_C_LABEL(dsitrap601):
stmw 28,disisave(0) /* free r28-r31 */
mfcr 29 /* save CR */
mfxer 30 /* save XER */
mtsprg 2,30 /* in SPRG2 */
mfsrr1 31 /* test kernel mode */
mtcr 31
bc 12,17,1f /* branch if PSL_PR is set */
mfdar 31 /* get fault address */
rlwinm 31,31,12,20,28 /* get "segment" battable offset */
/* get batl */
addis 31,31,_C_LABEL(battable)@ha
lwz 30,_C_LABEL(battable)+4@l(31)
mtcr 30
bc 4,25,1f /* branch if Valid is is false,
presently assumes supervisor only */
/* get batu */
lwz 31,_C_LABEL(battable)@l(31)
/* We randomly use the highest two bat registers here */
mfspr 28,SPR_RTCL_R
andi. 28,28,128
bne 2f
mtibatu 2,31
mtibatl 2,30
b 3f
2:
mtibatu 3,31
mtibatl 3,30
3:
mfsprg 30,2 /* restore XER */
mtxer 30
mtcr 29 /* restore CR */
lmw 28,disisave(0) /* restore r28-r31 */
rfi /* return to trapped code */
1:
mflr 28 /* save LR */
bla s_dsitrap
_C_LABEL(dsi601size) = .-_C_LABEL(dsitrap601)
/*
* Similar to the above for ISI
*/
.globl _C_LABEL(isitrap),_C_LABEL(isisize)
_C_LABEL(isitrap):
stmw 28,disisave(0) /* free r28-r31 */
mflr 28 /* save LR */
mfcr 29 /* save CR */
mfsrr1 31 /* test kernel mode */
mtcr 31
bc 12,17,1f /* branch if PSL_PR is set */
mfsrr0 31 /* get fault address */
rlwinm 31,31,7,25,28 /* get segment * 8 */
/* get batu */
addis 31,31,_C_LABEL(battable)@ha
lwz 30,_C_LABEL(battable)@l(31)
mtcr 30
bc 4,30,1f /* branch if supervisor valid is
false */
mtibatu 3,30
/* get batl */
lwz 30,_C_LABEL(battable)+4@l(31)
mtibatl 3,30
mtcr 29 /* restore CR */
lmw 28,disisave(0) /* restore r28-r31 */
rfi /* return to trapped code */
1:
bla s_isitrap
_C_LABEL(isisize)= .-_C_LABEL(isitrap)
/*
* Dedicated MPC601 version of the above.
* Considers different BAT format.
*/
.globl _C_LABEL(isitrap601),_C_LABEL(isi601size)
_C_LABEL(isitrap601):
stmw 28,disisave(0) /* free r28-r31 */
mflr 28 /* save LR */
mfcr 29 /* save CR */
mfsrr1 31 /* test kernel mode */
mtcr 31
bc 12,17,1f /* branch if PSL_PR is set */
mfsrr0 31 /* get fault address */
rlwinm 31,31,12,20,28 /* get "segment" battable offset */
/* get batl */
addis 31,31,_C_LABEL(battable)@ha
lwz 30,_C_LABEL(battable)+4@l(31)
mtcr 30
bc 4,25,1f /* branch if Valid is is false,
presently assumes supervisor only */
/* get batu */
lwz 31,_C_LABEL(battable)@l(31)
mtibatu 3,31
mtibatl 3,30
mtcr 29 /* restore CR */
lmw 28,disisave(0) /* restore r28-r31 */
rfi /* return to trapped code */
1:
bla s_isitrap
_C_LABEL(isi601size)= .-_C_LABEL(isitrap601)
/*
* This one for the external interrupt handler.
*/
.globl _C_LABEL(extint),_C_LABEL(extsize)
_C_LABEL(extint):
mtsprg 1,1 /* save SP */
stmw 28,tempsave(0) /* free r28-r31 */
mflr 28 /* save LR */
mfcr 29 /* save CR */
mfxer 30 /* save XER */
lis 1,intstk+INTSTK@ha /* get interrupt stack */
addi 1,1,intstk+INTSTK@l /* this is really intr_depth! */
lwz 31,0(1) /* were we already running on intstk? */
addic. 31,31,1
stw 31,0(1)
beq 1f
mfsprg 1,1 /* yes, get old SP */
1:
ba extintr
_C_LABEL(extsize) = .-_C_LABEL(extint)
/*
* And this one for the decrementer interrupt handler.
*/
.globl _C_LABEL(decrint),_C_LABEL(decrsize)
_C_LABEL(decrint):
mtsprg 1,1 /* save SP */
stmw 28,tempsave(0) /* free r28-r31 */
mflr 28 /* save LR */
mfcr 29 /* save CR */
mfxer 30 /* save XER */
lis 1,intstk+INTSTK@ha /* get interrupt stack */
addi 1,1,intstk+INTSTK@l
lwz 31,0(1) /* were we already running on intstk? */
addic. 31,31,1
stw 31,0(1)
beq 1f
mfsprg 1,1 /* yes, get old SP */
1:
ba decrintr
_C_LABEL(decrsize) = .-_C_LABEL(decrint)
/*
* Now the tlb software load for 603 processors:
* (Code essentially from the 603e User Manual, Chapter 5, but
* corrected a lot.)
*/
.globl _C_LABEL(tlbimiss),_C_LABEL(tlbimsize)
_C_LABEL(tlbimiss):
#ifdef PMAPDEBUG
mfspr 2,SPR_IMISS /* exception address */
li 1,24 /* get rid of the lower */
srw 2,2,1 /* 24 bits */
li 1,1 /* Load 1 */
cmpl 2,1,1 /* is it > 16MB */
blt 99f /* nope, skip saving these SPRs */
li 1,0xc0 /* arbitrary */
mfspr 2,SPR_HASH1
stw 2,0(1)
mfspr 2,SPR_HASH2
stw 2,4(1)
mfspr 2,SPR_IMISS
stw 2,8(1)
mfspr 2,SPR_ICMP
stw 2,12(1)
99:
#endif /* PMAPDEBUG */
mfspr 2,SPR_HASH1 /* get first pointer */
li 1,8
mfctr 0 /* save counter */
mfspr 3,SPR_ICMP /* get first compare value */
addi 2,2,-8 /* predec pointer */
1:
mtctr 1 /* load counter */
2:
lwzu 1,8(2) /* get next pte */
cmpl 0,1,3 /* see if found pte */
bdneq 2b /* loop if not eq */
bne 3f /* not found */
lwz 1,4(2) /* load tlb entry lower word */
andi. 3,1,8 /* check G-bit */
bne 4f /* if guarded, take ISI */
mtctr 0 /* restore counter */
mfspr 0,SPR_IMISS /* get the miss address for the tlbli */
mfsrr1 3 /* get the saved cr0 bits */
mtcrf 0x80,3 /* and restore */
ori 1,1,0x100 /* set the reference bit */
mtspr SPR_RPA,1 /* set the pte */
srwi 1,1,8 /* get byte 7 of pte */
tlbli 0 /* load the itlb */
stb 1,6(2) /* update page table */
rfi
3: /* not found in pteg */
andi. 1,3,0x40 /* have we already done second hash? */
bne 5f
mfspr 2,SPR_HASH2 /* get the second pointer */
ori 3,3,0x40 /* change the compare value */
li 1,8
addi 2,2,-8 /* predec pointer */
b 1b
4: /* guarded */
mfsrr1 3
andi. 2,3,0xffff /* clean upper srr1 */
oris 2,2,0x8000000@h /* set srr<4> to flag prot violation */
b 6f
5: /* not found anywhere */
mfsrr1 3
andi. 2,3,0xffff /* clean upper srr1 */
oris 2,2,0x40000000@h /* set srr1<1> to flag pte not found */
6:
mtctr 0 /* restore counter */
mtsrr1 2
mfmsr 0
xoris 0,0,0x20000@h /* flip the msr<tgpr> bit */
mtcrf 0x80,3 /* restore cr0 */
mtmsr 0 /* now with native gprs */
isync
ba EXC_ISI
_C_LABEL(tlbimsize) = .-_C_LABEL(tlbimiss)
.globl _C_LABEL(tlbdlmiss),_C_LABEL(tlbdlmsize)
_C_LABEL(tlbdlmiss):
mfspr 2,SPR_HASH1 /* get first pointer */
li 1,8
mfctr 0 /* save counter */
mfspr 3,SPR_DCMP /* get first compare value */
addi 2,2,-8 /* predec pointer */
1:
mtctr 1 /* load counter */
2:
lwzu 1,8(2) /* get next pte */
cmpl 0,1,3 /* see if found pte */
bdneq 2b /* loop if not eq */
bne 3f /* not found */
lwz 1,4(2) /* load tlb entry lower word */
mtctr 0 /* restore counter */
mfspr 0,SPR_DMISS /* get the miss address for the tlbld */
mfsrr1 3 /* get the saved cr0 bits */
mtcrf 0x80,3 /* and restore */
ori 1,1,0x100 /* set the reference bit */
mtspr SPR_RPA,1 /* set the pte */
srwi 1,1,8 /* get byte 7 of pte */
tlbld 0 /* load the dtlb */
stb 1,6(2) /* update page table */
rfi
3: /* not found in pteg */
andi. 1,3,0x40 /* have we already done second hash? */
bne 5f
mfspr 2,SPR_HASH2 /* get the second pointer */
ori 3,3,0x40 /* change the compare value */
li 1,8
addi 2,2,-8 /* predec pointer */
b 1b
5: /* not found anywhere */
mfsrr1 3
lis 1,0x40000000@h /* set dsisr<1> to flag pte not found */
mtctr 0 /* restore counter */
andi. 2,3,0xffff /* clean upper srr1 */
mtsrr1 2
mtdsisr 1 /* load the dsisr */
mfspr 1,SPR_DMISS /* get the miss address */
mtdar 1 /* put in dar */
mfmsr 0
xoris 0,0,0x20000@h /* flip the msr<tgpr> bit */
mtcrf 0x80,3 /* restore cr0 */
mtmsr 0 /* now with native gprs */
isync
ba EXC_DSI
_C_LABEL(tlbdlmsize) = .-_C_LABEL(tlbdlmiss)
.globl _C_LABEL(tlbdsmiss),_C_LABEL(tlbdsmsize)
_C_LABEL(tlbdsmiss):
mfspr 2,SPR_HASH1 /* get first pointer */
li 1,8
mfctr 0 /* save counter */
mfspr 3,SPR_DCMP /* get first compare value */
addi 2,2,-8 /* predec pointer */
1:
mtctr 1 /* load counter */
2:
lwzu 1,8(2) /* get next pte */
cmpl 0,1,3 /* see if found pte */
bdneq 2b /* loop if not eq */
bne 3f /* not found */
lwz 1,4(2) /* load tlb entry lower word */
andi. 3,1,0x80 /* check the C-bit */
beq 4f
5:
mtctr 0 /* restore counter */
mfspr 0,SPR_DMISS /* get the miss address for the tlbld */
mfsrr1 3 /* get the saved cr0 bits */
mtcrf 0x80,3 /* and restore */
mtspr SPR_RPA,1 /* set the pte */
tlbld 0 /* load the dtlb */
rfi
3: /* not found in pteg */
andi. 1,3,0x40 /* have we already done second hash? */
bne 5f
mfspr 2,SPR_HASH2 /* get the second pointer */
ori 3,3,0x40 /* change the compare value */
li 1,8
addi 2,2,-8 /* predec pointer */
b 1b
4: /* found, but C-bit = 0 */
rlwinm. 3,1,30,0,1 /* test PP */
bge- 7f
andi. 3,1,1
beq+ 8f
9: /* found, but protection violation (PP==00)*/
mfsrr1 3
lis 1,0xa000000@h /* indicate protection violation
on store */
b 1f
7: /* found, PP=1x */
mfspr 3,SPR_DMISS /* get the miss address */
mfsrin 1,3 /* get the segment register */
mfsrr1 3
rlwinm 3,3,18,31,31 /* get PR-bit */
rlwnm. 2,2,3,1,1 /* get the key */
bne- 9b /* protection violation */
8: /* found, set reference/change bits */
lwz 1,4(2) /* reload tlb entry */
ori 1,1,0x180
sth 1,6(2)
b 5b
5: /* not found anywhere */
mfsrr1 3
lis 1,0x42000000@h /* set dsisr<1> to flag pte not found */
/* dsisr<6> to flag store */
1:
mtctr 0 /* restore counter */
andi. 2,3,0xffff /* clean upper srr1 */
mtsrr1 2
mtdsisr 1 /* load the dsisr */
mfspr 1,SPR_DMISS /* get the miss address */
mtdar 1 /* put in dar */
mfmsr 0
xoris 0,0,0x20000@h /* flip the msr<tgpr> bit */
mtcrf 0x80,3 /* restore cr0 */
mtmsr 0 /* now with native gprs */
isync
ba EXC_DSI
_C_LABEL(tlbdsmsize) = .-_C_LABEL(tlbdsmiss)
#if defined(DDB) || defined(KGDB)
#define ddbsave 0xde0 /* primary save area for DDB */
/*
* In case of DDB we want a separate trap catcher for it
*/
.local ddbstk
.comm ddbstk,INTSTK,8 /* ddb stack */
.globl _C_LABEL(ddblow),_C_LABEL(ddbsize)
_C_LABEL(ddblow):
mtsprg 1,1 /* save SP */
stmw 28,ddbsave(0) /* free r28-r31 */
mflr 28 /* save LR */
mfcr 29 /* save CR */
lis 1,ddbstk+INTSTK@ha /* get new SP */
addi 1,1,ddbstk+INTSTK@l
bla ddbtrap
_C_LABEL(ddbsize) = .-_C_LABEL(ddblow)
#endif /* DDB | KGDB */
#ifdef IPKDB
#define ipkdbsave 0xde0 /* primary save area for IPKDB */
/*
* In case of IPKDB we want a separate trap catcher for it
*/
.local ipkdbstk
.comm ipkdbstk,INTSTK,8 /* ipkdb stack */
.globl _C_LABEL(ipkdblow),_C_LABEL(ipkdbsize)
_C_LABEL(ipkdblow):
mtsprg 1,1 /* save SP */
stmw 28,ipkdbsave(0) /* free r28-r31 */
mflr 28 /* save LR */
mfcr 29 /* save CR */
lis 1,ipkdbstk+INTSTK@ha /* get new SP */
addi 1,1,ipkdbstk+INTSTK@l
bla ipkdbtrap
_C_LABEL(ipkdbsize) = .-_C_LABEL(ipkdblow)
#endif /* IPKDB */
/*
* FRAME_SETUP assumes:
* SPRG1 SP (1)
* savearea r28-r31,DAR,DSISR (DAR & DSISR only for DSI traps)
* 28 LR
* 29 CR
* 1 kernel stack
* LR trap type
* SRR0/1 as at start of trap
*/
#define FRAME_SETUP(savearea) \
/* Have to enable translation to allow access of kernel stack: */ \
mfsrr0 30; \
mfsrr1 31; \
stmw 30,savearea+24(0); \
mfmsr 30; \
ori 30,30,(PSL_DR|PSL_IR); \
mtmsr 30; \
isync; \
mfsprg 31,1; \
stwu 31,-FRAMELEN(1); \
stw 0,FRAME_0+8(1); \
stw 31,FRAME_1+8(1); \
stw 28,FRAME_LR+8(1); \
stw 29,FRAME_CR+8(1); \
lmw 28,savearea(0); \
stmw 2,FRAME_2+8(1); \
lmw 28,savearea+16(0); \
mfxer 3; \
mfctr 4; \
mflr 5; \
andi. 5,5,0xff00; \
stw 3,FRAME_XER+8(1); \
stw 4,FRAME_CTR+8(1); \
stw 5,FRAME_EXC+8(1); \
stw 28,FRAME_DAR+8(1); \
stw 29,FRAME_DSISR+8(1); \
stw 30,FRAME_SRR0+8(1); \
stw 31,FRAME_SRR1+8(1)
#define FRAME_LEAVE(savearea) \
/* Now restore regs: */ \
lwz 2,FRAME_SRR0+8(1); \
lwz 3,FRAME_SRR1+8(1); \
lwz 4,FRAME_CTR+8(1); \
lwz 5,FRAME_XER+8(1); \
lwz 6,FRAME_LR+8(1); \
lwz 7,FRAME_CR+8(1); \
stw 2,savearea(0); \
stw 3,savearea+4(0); \
mtctr 4; \
mtxer 5; \
mtlr 6; \
mtsprg 1,7; /* save cr */ \
lmw 2,FRAME_2+8(1); \
lwz 0,FRAME_0+8(1); \
lwz 1,FRAME_1+8(1); \
mtsprg 2,2; /* save r2 & r3 */ \
mtsprg 3,3; \
/* Disable translation, machine check and recoverability: */ \
mfmsr 2; \
andi. 2,2,~(PSL_DR|PSL_IR|PSL_ME|PSL_RI)@l; \
mtmsr 2; \
isync; \
/* Decide whether we return to user mode: */ \
lwz 3,savearea+4(0); \
mtcr 3; \
bc 4,17,1f; /* branch if PSL_PR is false */ \
/* Restore user & kernel access SR: */ \
mfsprg 2,0; \
lwz 2,PC_CURPMAP(2); \
lwz 3,PM_SR+0(2); \
mtsr 0,3; /* restore SR0 */ \
lwz 3,PM_SR+4(2); \
mtsr 1,3; /* restore SR1 */ \
lwz 3,PM_SR+8(2); \
mtsr 2,3; /* restore SR2 */ \
lwz 3,PM_SR+12(2); \
mtsr 3,3; /* restore SR3 */ \
lwz 3,PM_SR+16(2); \
mtsr 4,3; /* restore SR4 */ \
lwz 3,PM_SR+20(2); \
mtsr 5,3; /* restore SR5 */ \
lwz 3,PM_SR+24(2); \
mtsr 6,3; /* restore SR6 */ \
lwz 3,PM_SR+28(2); \
mtsr 7,3; /* restore SR7 */ \
lwz 3,PM_USRSR(2); \
mtsr USER_SR,3; \
lwz 3,PM_KERNELSR(2); \
mtsr KERNEL_SR,3; \
1: mfsprg 2,1; /* restore cr */ \
mtcr 2; \
lwz 2,savearea(0); \
lwz 3,savearea+4(0); \
mtsrr0 2; \
mtsrr1 3; \
mfsprg 2,2; /* restore r2 & r3 */ \
mfsprg 3,3
/*
* Preamble code for DSI/ISI traps
*/
disitrap:
lmw 30,disisave(0)
stmw 30,tempsave(0)
lmw 30,disisave+8(0)
stmw 30,tempsave+8(0)
mfdar 30
mfdsisr 31
stmw 30,tempsave+16(0)
realtrap:
/* Test whether we already had PR set */
mfsrr1 1
mtcr 1
mfsprg 1,1 /* restore SP (might have been
overwritten) */
bc 4,17,s_trap /* branch if PSL_PR is false */
mfsprg 31,0
lwz 1,PC_CURPCB(31)
addi 1,1,USPACE /* stack is top of user struct */
/*
* Now the common trap catching code.
*/
s_trap:
/* First have to enable KERNEL mapping */
lis 31,KERNEL_SEGMENT@h
ori 31,31,KERNEL_SEGMENT@l
mtsr KERNEL_SR,31
/* Obliterate SRs so BAT spills work correctly */
lis 31,EMPTY_SEGMENT@h
ori 31,31,EMPTY_SEGMENT@l
mtsr 0,31
mtsr 1,31
mtsr 2,31
mtsr 3,31
mtsr 4,31
mtsr 5,31
mtsr 6,31
mtsr 7,31
FRAME_SETUP(tempsave)
/* Now we can recover interrupts again: */
mfmsr 7
ori 7,7,(PSL_EE|PSL_ME|PSL_RI)@l
mtmsr 7
isync
/* Call C trap code: */
trapagain:
addi 3,1,8
bl _C_LABEL(trap)
.globl _C_LABEL(trapexit)
_C_LABEL(trapexit):
/* Disable interrupts: */
mfmsr 3
andi. 3,3,~PSL_EE@l
mtmsr 3
/* Test AST pending: */
lwz 5,FRAME_SRR1+8(1)
mtcr 5
bc 4,17,1f /* branch if PSL_PR is false */
lis 3,_C_LABEL(astpending)@ha
lwz 4,_C_LABEL(astpending)@l(3)
andi. 4,4,1
beq 1f
li 6,EXC_AST
stw 6,FRAME_EXC+8(1)
b trapagain
1:
FRAME_LEAVE(tempsave)
rfi
/*
* DSI second stage fault handler
*/
s_dsitrap:
mfdsisr 31 /* test whether this may be a
spill fault */
mtcr 31
mtsprg 1,1 /* save SP */
bc 4,1,disitrap /* branch if table miss is false */
lis 1,spillstk+SPILLSTK@ha
addi 1,1,spillstk+SPILLSTK@l /* get spill stack */
stwu 1,-SPFRAMELEN(1)
stw 0,SPFRAME_R0(1) /* save non-volatile registers */
stw 3,SPFRAME_R3(1)
stw 4,SPFRAME_R4(1)
stw 5,SPFRAME_R5(1)
stw 6,SPFRAME_R6(1)
stw 7,SPFRAME_R7(1)
stw 8,SPFRAME_R8(1)
stw 9,SPFRAME_R9(1)
stw 10,SPFRAME_R10(1)
stw 11,SPFRAME_R11(1)
stw 12,SPFRAME_R12(1)
mflr 30 /* save trap type */
mfctr 31 /* & CTR */
mfdar 3
s_pte_spill:
bl _C_LABEL(pmap_pte_spill) /* try a spill */
or. 3,3,3
mtctr 31 /* restore CTR */
mtlr 30 /* and trap type */
mfsprg 31,2 /* get saved XER */
mtxer 31 /* restore XER */
lwz 12,SPFRAME_R12(1) /* restore non-volatile registers */
lwz 11,SPFRAME_R11(1)
lwz 10,SPFRAME_R10(1)
lwz 9,SPFRAME_R9(1)
lwz 8,SPFRAME_R8(1)
lwz 7,SPFRAME_R7(1)
lwz 6,SPFRAME_R6(1)
lwz 5,SPFRAME_R5(1)
lwz 4,SPFRAME_R4(1)
lwz 3,SPFRAME_R3(1)
lwz 0,SPFRAME_R0(1)
beq disitrap
mfsprg 1,1 /* restore SP */
mtcr 29 /* restore CR */
mtlr 28 /* restore LR */
lmw 28,disisave(0) /* restore r28-r31 */
rfi /* return to trapped code */
/*
* ISI second stage fault handler
*/
s_isitrap:
mfsrr1 31 /* test whether this may be a
spill fault */
mtcr 31
mtsprg 1,1 /* save SP */
bc 4,1,disitrap /* branch if table miss is false */
lis 1,spillstk+SPILLSTK@ha
addi 1,1,spillstk+SPILLSTK@l /* get spill stack */
stwu 1,-SPFRAMELEN(1)
stw 0,SPFRAME_R0(1) /* save non-volatile registers */
stw 3,SPFRAME_R3(1)
stw 4,SPFRAME_R4(1)
stw 5,SPFRAME_R5(1)
stw 6,SPFRAME_R6(1)
stw 7,SPFRAME_R7(1)
stw 8,SPFRAME_R8(1)
stw 9,SPFRAME_R9(1)
stw 10,SPFRAME_R10(1)
stw 11,SPFRAME_R11(1)
stw 12,SPFRAME_R12(1)
mfxer 30 /* save XER */
mtsprg 2,30
mflr 30 /* save trap type */
mfctr 31 /* & ctr */
mfsrr0 3
b s_pte_spill /* above */
/*
* External interrupt second level handler
*/
#define INTRENTER \
/* Save non-volatile registers: */ \
stwu 1,-IFRAMELEN(1); /* temporarily */ \
stw 0,IFRAME_R0(1); \
mfsprg 0,1; /* get original SP */ \
stw 0,IFRAME_R1(1); /* and store it */ \
stw 3,IFRAME_R3(1); \
stw 4,IFRAME_R4(1); \
stw 5,IFRAME_R5(1); \
stw 6,IFRAME_R6(1); \
stw 7,IFRAME_R7(1); \
stw 8,IFRAME_R8(1); \
stw 9,IFRAME_R9(1); \
stw 10,IFRAME_R10(1); \
stw 11,IFRAME_R11(1); \
stw 12,IFRAME_R12(1); \
stw 28,IFRAME_LR(1); /* saved LR */ \
stw 29,IFRAME_CR(1); /* saved CR */ \
stw 30,IFRAME_XER(1); /* saved XER */ \
lmw 28,tempsave(0); /* restore r28-r31 */ \
mfctr 6; \
lis 5,_C_LABEL(intr_depth)@ha; \
lwz 5,_C_LABEL(intr_depth)@l(5); \
mfsrr0 4; \
mfsrr1 3; \
stw 6,IFRAME_CTR(1); \
stw 5,IFRAME_INTR_DEPTH(1); \
stw 4,IFRAME_SRR0(1); \
stw 3,IFRAME_SRR1(1); \
mtcr 3; \
bc 4,17,99f; /* branch if PSL_PR is false */ \
lis 3,EMPTY_SEGMENT@h; \
ori 3,3,EMPTY_SEGMENT@l; \
mtsr 0,3; /* reset SRs so BAT spills work */ \
mtsr 1,3; \
mtsr 2,3; \
mtsr 3,3; \
mtsr 4,3; \
mtsr 5,3; \
mtsr 6,3; \
mtsr 7,3; \
/* interrupts are recoverable here, and enable translation */ \
lis 3,(KERNEL_SEGMENT|SR_KS|SR_KP)@h; \
ori 3,3,(KERNEL_SEGMENT|SR_KS|SR_KP)@l; \
mtsr KERNEL_SR,3; \
99: mfmsr 5; \
ori 5,5,(PSL_IR|PSL_DR|PSL_RI); \
mtmsr 5; \
isync
.globl _C_LABEL(extint_call)
extintr:
INTRENTER
_C_LABEL(extint_call):
bl _C_LABEL(extint_call) /* to be filled in later */
intr_exit:
/* Disable interrupts (should already be disabled) and MMU here: */
mfmsr 3
andi. 3,3,~(PSL_EE|PSL_ME|PSL_RI|PSL_DR|PSL_IR)@l
mtmsr 3
isync
/* restore possibly overwritten registers: */
lwz 12,IFRAME_R12(1)
lwz 11,IFRAME_R11(1)
lwz 10,IFRAME_R10(1)
lwz 9,IFRAME_R9(1)
lwz 8,IFRAME_R8(1)
lwz 7,IFRAME_R7(1)
lwz 6,IFRAME_SRR1(1)
lwz 5,IFRAME_SRR0(1)
lwz 4,IFRAME_CTR(1)
lwz 3,IFRAME_XER(1)
mtsrr1 6
mtsrr0 5
mtctr 4
mtxer 3
/* Returning to user mode? */
mtcr 6 /* saved SRR1 */
bc 4,17,1f /* branch if PSL_PR is false */
mfsprg 31,0
lwz 3,PC_CURPMAP(31)
lwz 4,PM_SR+0(3)
mtsr 0,4 /* Restore SR0 */
lwz 4,PM_SR+4(3)
mtsr 1,4 /* Restore SR1 */
lwz 4,PM_SR+8(3)
mtsr 2,4 /* Restore SR2 */
lwz 4,PM_SR+12(3)
mtsr 3,4 /* Restore SR3 */
lwz 4,PM_SR+16(3)
mtsr 4,4 /* Restore SR4 */
lwz 4,PM_SR+20(3)
mtsr 5,4 /* Restore SR5 */
lwz 4,PM_SR+24(3)
mtsr 6,4 /* Restore SR6 */
lwz 4,PM_SR+28(3)
mtsr 7,4 /* Restore SR7 */
lwz 3,PM_KERNELSR(3)
mtsr KERNEL_SR,3 /* Restore kernel SR */
lis 3,_C_LABEL(astpending)@ha /* Test AST pending */
lwz 4,_C_LABEL(astpending)@l(3)
andi. 4,4,1
beq 1f
/* Setup for entry to realtrap: */
lwz 3,IFRAME_R1(1) /* get saved SP */
mtsprg 1,3
li 6,EXC_AST
stmw 28,tempsave(0) /* establish tempsave again */
mtlr 6
lwz 28,IFRAME_LR(1) /* saved LR */
lwz 29,IFRAME_CR(1) /* saved CR */
lwz 6,IFRAME_R6(1)
lwz 5,IFRAME_R5(1)
lwz 4,IFRAME_R4(1)
lwz 3,IFRAME_R3(1)
lwz 0,IFRAME_R0(1)
lis 30,_C_LABEL(intr_depth)@ha /* adjust reentrancy count */
lwz 31,_C_LABEL(intr_depth)@l(30)
addi 31,31,-1
stw 31,_C_LABEL(intr_depth)@l(30)
b realtrap
1:
/* Here is the normal exit of extintr: */
lwz 5,IFRAME_CR(1)
lwz 6,IFRAME_LR(1)
mtcr 5
mtlr 6
lwz 6,IFRAME_R6(1)
lwz 5,IFRAME_R5(1)
lis 3,_C_LABEL(intr_depth)@ha /* adjust reentrancy count */
lwz 4,_C_LABEL(intr_depth)@l(3)
addi 4,4,-1
stw 4,_C_LABEL(intr_depth)@l(3)
lwz 4,IFRAME_R4(1)
lwz 3,IFRAME_R3(1)
lwz 0,IFRAME_R0(1)
lwz 1,IFRAME_R1(1)
rfi
/*
* Decrementer interrupt second level handler
*/
decrintr:
INTRENTER
addi 3,1,8 /* intr frame -> clock frame */
bl _C_LABEL(decr_intr)
b intr_exit
#if defined(DDB)
/*
* Deliberate entry to ddbtrap
*/
.globl _C_LABEL(ddb_trap)
_C_LABEL(ddb_trap):
mtsprg 1,1
mfmsr 3
mtsrr1 3
andi. 3,3,~(PSL_EE|PSL_ME)@l
mtmsr 3 /* disable interrupts */
isync
stmw 28,ddbsave(0)
mflr 28
li 29,EXC_BPT
mtlr 29
mfcr 29
mtsrr0 28
#endif /* DDB */
#if defined(DDB) || defined(KGDB)
/*
* Now the ddb trap catching code.
*/
ddbtrap:
FRAME_SETUP(ddbsave)
/* Call C trap code: */
addi 3,1,8
bl _C_LABEL(ddb_trap_glue)
or. 3,3,3
bne ddbleave
/* This wasn't for DDB, so switch to real trap: */
lwz 3,FRAME_EXC+8(1) /* save exception */
stw 3,ddbsave+8(0)
FRAME_LEAVE(ddbsave)
mtsprg 1,1 /* prepare for entrance to realtrap */
stmw 28,tempsave(0)
mflr 28
mfcr 29
lwz 31,ddbsave+8(0)
mtlr 31
b realtrap
ddbleave:
FRAME_LEAVE(ddbsave)
rfi
#endif /* DDB || KGDB */
#ifdef IPKDB
/*
* Deliberate entry to ipkdbtrap
*/
.globl _C_LABEL(ipkdb_trap)
_C_LABEL(ipkdb_trap):
mtsprg 1,1
mfmsr 3
mtsrr1 3
andi. 3,3,~(PSL_EE|PSL_ME)@l
mtmsr 3 /* disable interrupts */
isync
stmw 28,ipkdbsave(0)
mflr 28
li 29,EXC_BPT
mtlr 29
mfcr 29
mtsrr0 28
/*
* Now the ipkdb trap catching code.
*/
ipkdbtrap:
FRAME_SETUP(ipkdbsave)
/* Call C trap code: */
addi 3,1,8
bl _C_LABEL(ipkdb_trap_glue)
or. 3,3,3
bne ipkdbleave
/* This wasn't for IPKDB, so switch to real trap: */
lwz 3,FRAME_EXC+8(1) /* save exception */
stw 3,ipkdbsave+8(0)
FRAME_LEAVE(ipkdbsave)
mtsprg 1,1 /* prepare for entrance to realtrap */
stmw 28,tempsave(0)
mflr 28
mfcr 29
lwz 31,ipkdbsave+8(0)
mtlr 31
b realtrap
ipkdbleave:
FRAME_LEAVE(ipkdbsave)
rfi
ipkdbfault:
ba _ipkdbfault
_ipkdbfault:
mfsrr0 3
addi 3,3,4
mtsrr0 3
li 3,-1
rfi
/*
* int ipkdbfbyte(unsigned char *p)
*/
.globl _C_LABEL(ipkdbfbyte)
_C_LABEL(ipkdbfbyte):
li 9,EXC_DSI /* establish new fault routine */
lwz 5,0(9)
lis 6,ipkdbfault@ha
lwz 6,ipkdbfault@l(6)
stw 6,0(9)
#ifdef IPKDBUSERHACK
lis 8,_C_LABEL(ipkdbsr)@ha
lwz 8,_C_LABEL(ipkdbsr)@l(8)
mtsr USER_SR,8
isync
#endif
dcbst 0,9 /* flush data... */
sync
icbi 0,9 /* and instruction caches */
lbz 3,0(3) /* fetch data */
stw 5,0(9) /* restore previous fault handler */
dcbst 0,9 /* and flush data... */
sync
icbi 0,9 /* and instruction caches */
blr
/*
* int ipkdbsbyte(unsigned char *p, int c)
*/
.globl _C_LABEL(ipkdbsbyte)
_C_LABEL(ipkdbsbyte):
li 9,EXC_DSI /* establish new fault routine */
lwz 5,0(9)
lis 6,ipkdbfault@ha
lwz 6,ipkdbfault@l(6)
stw 6,0(9)
#ifdef IPKDBUSERHACK
lis 8,_C_LABEL(ipkdbsr)@ha
lwz 8,_C_LABEL(ipkdbsr)@l(8)
mtsr USER_SR,8
isync
#endif
dcbst 0,9 /* flush data... */
sync
icbi 0,9 /* and instruction caches */
mr 6,3
xor 3,3,3
stb 4,0(6)
dcbst 0,6 /* Now do appropriate flushes
to data... */
sync
icbi 0,6 /* and instruction caches */
stw 5,0(9) /* restore previous fault handler */
dcbst 0,9 /* and flush data... */
sync
icbi 0,9 /* and instruction caches */
blr
#endif /* IPKDB */
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