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8a4cf006f4
freebsd-dev/sys/powerpc/aim/trap_subr64.S
Nathan Whitehorn 8a4cf006f4 Fix a bug where the pmap_cpu_bootstrap() ap argument could be clobbered. 
Luckily, it mostly wasn't important, so this didn't cause major problems.
Also improve register reuse when setting up trap frames very slightly.

Submitted by:	Justin Hibbits <chmeeedalf at gmail dot com>
MFC after:	5 days
2011-11-09 13:48:23 +00:00

654 lines
19 KiB
ArmAsm
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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/aim/trap_subr.S>
*/
/*
* Save/restore segment registers
*/
/*
* Restore SRs for a pmap
*
* Requires that r28-r31 be scratch, with r28 initialized to the SLB cache
*/
/*
* User SRs are loaded through a pointer to the current pmap.
*/
restore_usersrs:
GET_CPUINFO(%r28)
ld %r28,PC_USERSLB(%r28)
li %r29, 0 /* Set the counter to zero */
slbia
slbmfee %r31,%r29
clrrdi %r31,%r31,28
slbie %r31
1: ld %r31, 0(%r28) /* Load SLB entry pointer */
cmpli 0, %r31, 0 /* If NULL, stop */
beqlr
ld %r30, 0(%r31) /* Load SLBV */
ld %r31, 8(%r31) /* Load SLBE */
or %r31, %r31, %r29 /* Set SLBE slot */
slbmte %r30, %r31 /* Install SLB entry */
addi %r28, %r28, 8 /* Advance pointer */
addi %r29, %r29, 1
b 1b /* Repeat */
/*
* Kernel SRs are loaded directly from the PCPU fields
*/
restore_kernsrs:
GET_CPUINFO(%r28)
addi %r28,%r28,PC_KERNSLB
li %r29, 0 /* Set the counter to zero */
slbia
slbmfee %r31,%r29
clrrdi %r31,%r31,28
slbie %r31
1: cmpli 0, %r29, USER_SLB_SLOT /* Skip the user slot */
beq- 2f
ld %r31, 8(%r28) /* Load SLBE */
cmpli 0, %r31, 0 /* If SLBE is not valid, stop */
beqlr
ld %r30, 0(%r28) /* Load SLBV */
slbmte %r30, %r31 /* Install SLB entry */
2: addi %r28, %r28, 16 /* Advance pointer */
addi %r29, %r29, 1
cmpli 0, %r29, 64 /* Repeat if we are not at the end */
blt 1b
blr
/*
* FRAME_SETUP assumes:
* SPRG1 SP (1)
* SPRG3 trap type
* savearea r27-r31,DAR,DSISR (DAR & DSISR only for DSI traps)
* r28 LR
* r29 CR
* r30 scratch
* r31 scratch
* r1 kernel stack
* SRR0/1 as at start of trap
*/
#define FRAME_SETUP(savearea) \
/* Have to enable translation to allow access of kernel stack: */ \
GET_CPUINFO(%r31); \
mfsrr0 %r30; \
std %r30,(savearea+CPUSAVE_SRR0)(%r31); /* save SRR0 */ \
mfsrr1 %r30; \
std %r30,(savearea+CPUSAVE_SRR1)(%r31); /* save SRR1 */ \
mfmsr %r30; \
ori %r30,%r30,(PSL_DR|PSL_IR|PSL_RI)@l; /* relocation on */ \
mtmsr %r30; /* stack can now be accessed */ \
isync; \
mfsprg1 %r31; /* get saved SP */ \
stdu %r31,-(FRAMELEN+288)(%r1); /* save it in the callframe */ \
std %r0, FRAME_0+48(%r1); /* save r0 in the trapframe */ \
std %r31,FRAME_1+48(%r1); /* save SP " " */ \
std %r2, FRAME_2+48(%r1); /* save r2 " " */ \
std %r28,FRAME_LR+48(%r1); /* save LR " " */ \
std %r29,FRAME_CR+48(%r1); /* save CR " " */ \
GET_CPUINFO(%r2); \
ld %r27,(savearea+CPUSAVE_R27)(%r2); /* get saved r27 */ \
ld %r28,(savearea+CPUSAVE_R28)(%r2); /* get saved r28 */ \
ld %r29,(savearea+CPUSAVE_R29)(%r2); /* get saved r29 */ \
ld %r30,(savearea+CPUSAVE_R30)(%r2); /* get saved r30 */ \
ld %r31,(savearea+CPUSAVE_R31)(%r2); /* get saved r31 */ \
std %r3, FRAME_3+48(%r1); /* save r3-r31 */ \
std %r4, FRAME_4+48(%r1); \
std %r5, FRAME_5+48(%r1); \
std %r6, FRAME_6+48(%r1); \
std %r7, FRAME_7+48(%r1); \
std %r8, FRAME_8+48(%r1); \
std %r9, FRAME_9+48(%r1); \
std %r10, FRAME_10+48(%r1); \
std %r11, FRAME_11+48(%r1); \
std %r12, FRAME_12+48(%r1); \
std %r13, FRAME_13+48(%r1); \
std %r14, FRAME_14+48(%r1); \
std %r15, FRAME_15+48(%r1); \
std %r16, FRAME_16+48(%r1); \
std %r17, FRAME_17+48(%r1); \
std %r18, FRAME_18+48(%r1); \
std %r19, FRAME_19+48(%r1); \
std %r20, FRAME_20+48(%r1); \
std %r21, FRAME_21+48(%r1); \
std %r22, FRAME_22+48(%r1); \
std %r23, FRAME_23+48(%r1); \
std %r24, FRAME_24+48(%r1); \
std %r25, FRAME_25+48(%r1); \
std %r26, FRAME_26+48(%r1); \
std %r27, FRAME_27+48(%r1); \
std %r28, FRAME_28+48(%r1); \
std %r29, FRAME_29+48(%r1); \
std %r30, FRAME_30+48(%r1); \
std %r31, FRAME_31+48(%r1); \
ld %r28,(savearea+CPUSAVE_AIM_DAR)(%r2); /* saved DAR */ \
ld %r29,(savearea+CPUSAVE_AIM_DSISR)(%r2);/* saved DSISR */\
ld %r30,(savearea+CPUSAVE_SRR0)(%r2); /* saved SRR0 */ \
ld %r31,(savearea+CPUSAVE_SRR1)(%r2); /* saved SRR1 */ \
mfxer %r3; \
mfctr %r4; \
mfsprg3 %r5; \
std %r3, FRAME_XER+48(1); /* save xer/ctr/exc */ \
std %r4, FRAME_CTR+48(1); \
std %r5, FRAME_EXC+48(1); \
std %r28,FRAME_AIM_DAR+48(1); \
std %r29,FRAME_AIM_DSISR+48(1); /* save dsisr/srr0/srr1 */ \
std %r30,FRAME_SRR0+48(1); \
std %r31,FRAME_SRR1+48(1); \
ld %r13,PC_CURTHREAD(%r2) /* set kernel curthread */
#define FRAME_LEAVE(savearea) \
/* Disable exceptions: */ \
mfmsr %r2; \
andi. %r2,%r2,~PSL_EE@l; \
mtmsr %r2; \
isync; \
/* Now restore regs: */ \
ld %r2,FRAME_SRR0+48(%r1); \
ld %r3,FRAME_SRR1+48(%r1); \
ld %r4,FRAME_CTR+48(%r1); \
ld %r5,FRAME_XER+48(%r1); \
ld %r6,FRAME_LR+48(%r1); \
GET_CPUINFO(%r7); \
std %r2,(savearea+CPUSAVE_SRR0)(%r7); /* save SRR0 */ \
std %r3,(savearea+CPUSAVE_SRR1)(%r7); /* save SRR1 */ \
ld %r7,FRAME_CR+48(%r1); \
mtctr %r4; \
mtxer %r5; \
mtlr %r6; \
mtsprg1 %r7; /* save cr */ \
ld %r31,FRAME_31+48(%r1); /* restore r0-31 */ \
ld %r30,FRAME_30+48(%r1); \
ld %r29,FRAME_29+48(%r1); \
ld %r28,FRAME_28+48(%r1); \
ld %r27,FRAME_27+48(%r1); \
ld %r26,FRAME_26+48(%r1); \
ld %r25,FRAME_25+48(%r1); \
ld %r24,FRAME_24+48(%r1); \
ld %r23,FRAME_23+48(%r1); \
ld %r22,FRAME_22+48(%r1); \
ld %r21,FRAME_21+48(%r1); \
ld %r20,FRAME_20+48(%r1); \
ld %r19,FRAME_19+48(%r1); \
ld %r18,FRAME_18+48(%r1); \
ld %r17,FRAME_17+48(%r1); \
ld %r16,FRAME_16+48(%r1); \
ld %r15,FRAME_15+48(%r1); \
ld %r14,FRAME_14+48(%r1); \
ld %r13,FRAME_13+48(%r1); \
ld %r12,FRAME_12+48(%r1); \
ld %r11,FRAME_11+48(%r1); \
ld %r10,FRAME_10+48(%r1); \
ld %r9, FRAME_9+48(%r1); \
ld %r8, FRAME_8+48(%r1); \
ld %r7, FRAME_7+48(%r1); \
ld %r6, FRAME_6+48(%r1); \
ld %r5, FRAME_5+48(%r1); \
ld %r4, FRAME_4+48(%r1); \
ld %r3, FRAME_3+48(%r1); \
ld %r2, FRAME_2+48(%r1); \
ld %r0, FRAME_0+48(%r1); \
ld %r1, FRAME_1+48(%r1); \
/* Can't touch %r1 from here on */ \
mtsprg2 %r2; /* save r2 & r3 */ \
mtsprg3 %r3; \
/* Disable translation, machine check and recoverability: */ \
mfmsr %r2; \
andi. %r2,%r2,~(PSL_DR|PSL_IR|PSL_ME|PSL_RI)@l; \
mtmsr %r2; \
isync; \
/* Decide whether we return to user mode: */ \
GET_CPUINFO(%r2); \
ld %r3,(savearea+CPUSAVE_SRR1)(%r2); \
mtcr %r3; \
bf 17,1f; /* branch if PSL_PR is false */ \
/* Restore user SRs */ \
GET_CPUINFO(%r3); \
std %r27,(savearea+CPUSAVE_R27)(%r3); \
std %r28,(savearea+CPUSAVE_R28)(%r3); \
std %r29,(savearea+CPUSAVE_R29)(%r3); \
std %r30,(savearea+CPUSAVE_R30)(%r3); \
std %r31,(savearea+CPUSAVE_R31)(%r3); \
mflr %r27; /* preserve LR */ \
bl restore_usersrs; /* uses r28-r31 */ \
mtlr %r27; \
ld %r31,(savearea+CPUSAVE_R31)(%r3); \
ld %r30,(savearea+CPUSAVE_R30)(%r3); \
ld %r29,(savearea+CPUSAVE_R29)(%r3); \
ld %r28,(savearea+CPUSAVE_R28)(%r3); \
ld %r27,(savearea+CPUSAVE_R27)(%r3); \
1: mfsprg1 %r2; /* restore cr */ \
mtcr %r2; \
GET_CPUINFO(%r2); \
ld %r3,(savearea+CPUSAVE_SRR0)(%r2); /* restore srr0 */ \
mtsrr0 %r3; \
ld %r3,(savearea+CPUSAVE_SRR1)(%r2); /* restore srr1 */ \
mtsrr1 %r3; \
mfsprg2 %r2; /* restore r2 & r3 */ \
mfsprg3 %r3
#ifdef SMP
/*
* Processor reset exception handler. These are typically
* the first instructions the processor executes after a
* software reset. We do this in two bits so that we are
* not still hanging around in the trap handling region
* once the MMU is turned on.
*/
.globl CNAME(rstcode), CNAME(rstsize)
CNAME(rstcode):
/* Explicitly set MSR[SF] */
mfmsr %r9
li %r8,1
insrdi %r9,%r8,1,0
mtmsrd %r9
isync
ba cpu_reset
CNAME(rstsize) = . - CNAME(rstcode)
cpu_reset:
lis %r1,(tmpstk+TMPSTKSZ-48)@ha /* get new SP */
addi %r1,%r1,(tmpstk+TMPSTKSZ-48)@l
lis %r3,tocbase@ha
ld %r2,tocbase@l(%r3)
lis %r3,1@l
bl CNAME(cpudep_ap_early_bootstrap) /* Set PCPU */
nop
lis %r3,1@l
bl CNAME(pmap_cpu_bootstrap) /* Turn on virtual memory */
nop
bl CNAME(cpudep_ap_bootstrap) /* Set up PCPU and stack */
nop
mr %r1,%r3 /* Use new stack */
bl CNAME(machdep_ap_bootstrap) /* And away! */
nop
/* Should not be reached */
9:
b 9b
#endif
/*
* This code gets copied to all the trap vectors
* (except ISI/DSI, ALI, and the interrupts)
*/
.globl CNAME(trapcode),CNAME(trapsize)
CNAME(trapcode):
mtsprg1 %r1 /* save SP */
mflr %r1 /* Save the old LR in r1 */
mtsprg2 %r1 /* And then in SPRG2 */
li %r1, 0xA0 /* How to get the vector from LR */
bla generictrap /* LR & SPRG3 is exception # */
CNAME(trapsize) = .-CNAME(trapcode)
/*
* For ALI: has to save DSISR and DAR
*/
.globl CNAME(alitrap),CNAME(alisize)
CNAME(alitrap):
mtsprg1 %r1 /* save SP */
GET_CPUINFO(%r1)
std %r27,(PC_TEMPSAVE+CPUSAVE_R27)(%r1) /* free r27-r31 */
std %r28,(PC_TEMPSAVE+CPUSAVE_R28)(%r1)
std %r29,(PC_TEMPSAVE+CPUSAVE_R29)(%r1)
std %r30,(PC_TEMPSAVE+CPUSAVE_R30)(%r1)
std %r31,(PC_TEMPSAVE+CPUSAVE_R31)(%r1)
mfdar %r30
mfdsisr %r31
std %r30,(PC_TEMPSAVE+CPUSAVE_AIM_DAR)(%r1)
std %r31,(PC_TEMPSAVE+CPUSAVE_AIM_DSISR)(%r1)
mfsprg1 %r1 /* restore SP, in case of branch */
mflr %r28 /* save LR */
mfcr %r29 /* save CR */
/* Put our exception vector in SPRG3 */
li %r31, EXC_ALI
mtsprg3 %r31
/* Test whether we already had PR set */
mfsrr1 %r31
mtcr %r31
bla s_trap
CNAME(alisize) = .-CNAME(alitrap)
/*
* Similar to the above for DSI
* Has to handle BAT spills
* and standard pagetable spills
*/
.globl CNAME(dsitrap),CNAME(dsisize)
CNAME(dsitrap):
mtsprg1 %r1 /* save SP */
GET_CPUINFO(%r1)
std %r27,(PC_DISISAVE+CPUSAVE_R27)(%r1) /* free r27-r31 */
std %r28,(PC_DISISAVE+CPUSAVE_R28)(%r1)
std %r29,(PC_DISISAVE+CPUSAVE_R29)(%r1)
std %r30,(PC_DISISAVE+CPUSAVE_R30)(%r1)
std %r31,(PC_DISISAVE+CPUSAVE_R31)(%r1)
mfsprg1 %r1 /* restore SP */
mfcr %r29 /* save CR */
mfxer %r30 /* save XER */
mtsprg2 %r30 /* in SPRG2 */
mfsrr1 %r31 /* test kernel mode */
mtcr %r31
mflr %r28 /* save LR (SP already saved) */
bla disitrap
CNAME(dsisize) = .-CNAME(dsitrap)
/*
* Preamble code for DSI/ISI traps
*/
disitrap:
/* Write the trap vector to SPRG3 by computing LR & 0xff00 */
mflr %r1
andi. %r1,%r1,0xff00
mtsprg3 %r1
GET_CPUINFO(%r1)
ld %r31,(PC_DISISAVE+CPUSAVE_R27)(%r1)
std %r31,(PC_TEMPSAVE+CPUSAVE_R27)(%r1)
ld %r30,(PC_DISISAVE+CPUSAVE_R28)(%r1)
std %r30,(PC_TEMPSAVE+CPUSAVE_R28)(%r1)
ld %r31,(PC_DISISAVE+CPUSAVE_R29)(%r1)
std %r31,(PC_TEMPSAVE+CPUSAVE_R29)(%r1)
ld %r30,(PC_DISISAVE+CPUSAVE_R30)(%r1)
std %r30,(PC_TEMPSAVE+CPUSAVE_R30)(%r1)
ld %r31,(PC_DISISAVE+CPUSAVE_R31)(%r1)
std %r31,(PC_TEMPSAVE+CPUSAVE_R31)(%r1)
mfdar %r30
mfdsisr %r31
std %r30,(PC_TEMPSAVE+CPUSAVE_AIM_DAR)(%r1)
std %r31,(PC_TEMPSAVE+CPUSAVE_AIM_DSISR)(%r1)
#ifdef KDB
/* Try and detect a kernel stack overflow */
mfsrr1 %r31
mtcr %r31
bt 17,realtrap /* branch is user mode */
mfsprg1 %r31 /* get old SP */
sub. %r30,%r31,%r30 /* SP - DAR */
bge 1f
neg %r30,%r30 /* modulo value */
1: cmpldi %cr0,%r30,4096 /* is DAR within a page of SP? */
bge %cr0,realtrap /* no, too far away. */
/* Now convert this DSI into a DDB trap. */
GET_CPUINFO(%r1)
ld %r30,(PC_TEMPSAVE+CPUSAVE_AIM_DAR)(%r1) /* get DAR */
std %r30,(PC_DBSAVE +CPUSAVE_AIM_DAR)(%r1) /* save DAR */
ld %r30,(PC_TEMPSAVE+CPUSAVE_AIM_DSISR)(%r1) /* get DSISR */
std %r30,(PC_DBSAVE +CPUSAVE_AIM_DSISR)(%r1) /* save DSISR */
ld %r31,(PC_DISISAVE+CPUSAVE_R27)(%r1) /* get r27 */
std %r31,(PC_DBSAVE +CPUSAVE_R27)(%r1) /* save r27 */
ld %r30,(PC_DISISAVE+CPUSAVE_R28)(%r1) /* get r28 */
std %r30,(PC_DBSAVE +CPUSAVE_R28)(%r1) /* save r28 */
ld %r31,(PC_DISISAVE+CPUSAVE_R29)(%r1) /* get r29 */
std %r31,(PC_DBSAVE +CPUSAVE_R29)(%r1) /* save r29 */
ld %r30,(PC_DISISAVE+CPUSAVE_R30)(%r1) /* get r30 */
std %r30,(PC_DBSAVE +CPUSAVE_R30)(%r1) /* save r30 */
ld %r31,(PC_DISISAVE+CPUSAVE_R31)(%r1) /* get r31 */
std %r31,(PC_DBSAVE +CPUSAVE_R31)(%r1) /* save r31 */
b dbtrap
#endif
/* XXX need stack probe here */
realtrap:
/* Test whether we already had PR set */
mfsrr1 %r1
mtcr %r1
mfsprg1 %r1 /* restore SP (might have been
overwritten) */
bf 17,k_trap /* branch if PSL_PR is false */
GET_CPUINFO(%r1)
ld %r1,PC_CURPCB(%r1)
mr %r27,%r28 /* Save LR, r29 */
mtsprg2 %r29
bl restore_kernsrs /* enable kernel mapping */
mfsprg2 %r29
mr %r28,%r27
ba s_trap
/*
* generictrap does some standard setup for trap handling to minimize
* the code that need be installed in the actual vectors. It expects
* the following conditions.
*
* R1 - Trap vector = LR & (0xff00 | R1)
* SPRG1 - Original R1 contents
* SPRG2 - Original LR
*/
generictrap:
/* Save R1 for computing the exception vector */
mtsprg3 %r1
/* Save interesting registers */
GET_CPUINFO(%r1)
std %r27,(PC_TEMPSAVE+CPUSAVE_R27)(%r1) /* free r27-r31 */
std %r28,(PC_TEMPSAVE+CPUSAVE_R28)(%r1)
std %r29,(PC_TEMPSAVE+CPUSAVE_R29)(%r1)
std %r30,(PC_TEMPSAVE+CPUSAVE_R30)(%r1)
std %r31,(PC_TEMPSAVE+CPUSAVE_R31)(%r1)
mfdar %r30
std %r30,(PC_TEMPSAVE+CPUSAVE_AIM_DAR)(%r1)
mfsprg1 %r1 /* restore SP, in case of branch */
mfsprg2 %r28 /* save LR */
mfcr %r29 /* save CR */
/* Compute the exception vector from the link register */
mfsprg3 %r31
ori %r31,%r31,0xff00
mflr %r30
and %r30,%r30,%r31
mtsprg3 %r30
/* Test whether we already had PR set */
mfsrr1 %r31
mtcr %r31
s_trap:
bf 17,k_trap /* branch if PSL_PR is false */
GET_CPUINFO(%r1)
u_trap:
ld %r1,PC_CURPCB(%r1)
mr %r27,%r28 /* Save LR, r29 */
mtsprg2 %r29
bl restore_kernsrs /* enable kernel mapping */
mfsprg2 %r29
mr %r28,%r27
/*
* Now the common trap catching code.
*/
k_trap:
FRAME_SETUP(PC_TEMPSAVE)
/* Call C interrupt dispatcher: */
trapagain:
lis %r3,tocbase@ha
ld %r2,tocbase@l(%r3)
addi %r3,%r1,48
bl CNAME(powerpc_interrupt)
nop
.globl CNAME(trapexit) /* backtrace code sentinel */
CNAME(trapexit):
/* Disable interrupts: */
mfmsr %r3
andi. %r3,%r3,~PSL_EE@l
mtmsr %r3
isync
/* Test AST pending: */
ld %r5,FRAME_SRR1+48(%r1)
mtcr %r5
bf 17,1f /* branch if PSL_PR is false */
GET_CPUINFO(%r3) /* get per-CPU pointer */
lwz %r4, TD_FLAGS(%r13) /* get thread flags value */
lis %r5, (TDF_ASTPENDING|TDF_NEEDRESCHED)@h
ori %r5,%r5, (TDF_ASTPENDING|TDF_NEEDRESCHED)@l
and. %r4,%r4,%r5
beq 1f
mfmsr %r3 /* re-enable interrupts */
ori %r3,%r3,PSL_EE@l
mtmsr %r3
isync
lis %r3,tocbase@ha
ld %r2,tocbase@l(%r3)
addi %r3,%r1,48
bl CNAME(ast)
nop
.globl CNAME(asttrapexit) /* backtrace code sentinel #2 */
CNAME(asttrapexit):
b trapexit /* test ast ret value ? */
1:
FRAME_LEAVE(PC_TEMPSAVE)
rfid
#if defined(KDB)
/*
* Deliberate entry to dbtrap
*/
ASENTRY(breakpoint)
mtsprg1 %r1
mfmsr %r3
mtsrr1 %r3
andi. %r3,%r3,~(PSL_EE|PSL_ME)@l
mtmsr %r3 /* disable interrupts */
isync
GET_CPUINFO(%r3)
std %r27,(PC_DBSAVE+CPUSAVE_R27)(%r3)
std %r28,(PC_DBSAVE+CPUSAVE_R28)(%r3)
std %r29,(PC_DBSAVE+CPUSAVE_R29)(%r3)
std %r30,(PC_DBSAVE+CPUSAVE_R30)(%r3)
std %r31,(PC_DBSAVE+CPUSAVE_R31)(%r3)
mflr %r28
li %r29,EXC_BPT
mtlr %r29
mfcr %r29
mtsrr0 %r28
/*
* Now the kdb trap catching code.
*/
dbtrap:
/* Write the trap vector to SPRG3 by computing LR & 0xff00 */
mflr %r1
andi. %r1,%r1,0xff00
mtsprg3 %r1
lis %r1,(tmpstk+TMPSTKSZ-48)@ha /* get new SP */
addi %r1,%r1,(tmpstk+TMPSTKSZ-48)@l
FRAME_SETUP(PC_DBSAVE)
/* Call C trap code: */
lis %r3,tocbase@ha
ld %r2,tocbase@l(%r3)
addi %r3,%r1,48
bl CNAME(db_trap_glue)
nop
or. %r3,%r3,%r3
bne dbleave
/* This wasn't for KDB, so switch to real trap: */
ld %r3,FRAME_EXC+48(%r1) /* save exception */
GET_CPUINFO(%r4)
std %r3,(PC_DBSAVE+CPUSAVE_R31)(%r4)
FRAME_LEAVE(PC_DBSAVE)
mtsprg1 %r1 /* prepare for entrance to realtrap */
GET_CPUINFO(%r1)
std %r27,(PC_TEMPSAVE+CPUSAVE_R27)(%r1)
std %r28,(PC_TEMPSAVE+CPUSAVE_R28)(%r1)
std %r29,(PC_TEMPSAVE+CPUSAVE_R29)(%r1)
std %r30,(PC_TEMPSAVE+CPUSAVE_R30)(%r1)
std %r31,(PC_TEMPSAVE+CPUSAVE_R31)(%r1)
mflr %r28
mfcr %r29
ld %r31,(PC_DBSAVE+CPUSAVE_R31)(%r1)
mtsprg3 %r31 /* SPRG3 was clobbered by FRAME_LEAVE */
mfsprg1 %r1
b realtrap
dbleave:
FRAME_LEAVE(PC_DBSAVE)
rfid
/*
* In case of KDB we want a separate trap catcher for it
*/
.globl CNAME(dblow),CNAME(dbsize)
CNAME(dblow):
mtsprg1 %r1 /* save SP */
mtsprg2 %r29 /* save r29 */
mfcr %r29 /* save CR in r29 */
mfsrr1 %r1
mtcr %r1
bf 17,1f /* branch if privileged */
/* Unprivileged case */
mtcr %r29 /* put the condition register back */
mfsprg2 %r29 /* ... and r29 */
mflr %r1 /* save LR */
mtsprg2 %r1 /* And then in SPRG2 */
li %r1, 0 /* How to get the vector from LR */
bla generictrap /* and we look like a generic trap */
1:
/* Privileged, so drop to KDB */
GET_CPUINFO(%r1)
std %r27,(PC_DBSAVE+CPUSAVE_R27)(%r1) /* free r27 */
std %r28,(PC_DBSAVE+CPUSAVE_R28)(%r1) /* free r28 */
mfsprg2 %r28 /* r29 holds cr... */
std %r28,(PC_DBSAVE+CPUSAVE_R29)(%r1) /* free r29 */
std %r30,(PC_DBSAVE+CPUSAVE_R30)(%r1) /* free r30 */
std %r31,(PC_DBSAVE+CPUSAVE_R31)(%r1) /* free r31 */
mflr %r28 /* save LR */
bla dbtrap
CNAME(dbsize) = .-CNAME(dblow)
#endif /* KDB */
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