aboutsummaryrefslogtreecommitdiff
path: root/arch
diff options
context:
space:
mode:
authorAnanth N Mavinakayanahalli <ananth@in.ibm.com>2007-04-18 15:56:38 +1000
committerPaul Mackerras <paulus@samba.org>2007-04-24 21:31:57 +1000
commit6888199f7fe5ea496f48bb6de67b9b7f05b8071b (patch)
tree9d276fa0ac794226110b1c4676666f8b0df8650c /arch
parent5cc5133a29fab993f0b40c03e975bc5458ece507 (diff)
[POWERPC] Emulate more instructions in software
Emulate a few more instructions in software - especially useful during singlestepping (xmon/kprobes). Instructions emulated with this patch are mfcr/mtcr rX, mfxer/mtxer rX, mflr/mtlr rX, mfctr/mtctr rX and mr rA,rB. Signed-off-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/powerpc/lib/sstep.c45
1 files changed, 44 insertions, 1 deletions
diff --git a/arch/powerpc/lib/sstep.c b/arch/powerpc/lib/sstep.c
index 7e8ded051b5..4aae0c38764 100644
--- a/arch/powerpc/lib/sstep.c
+++ b/arch/powerpc/lib/sstep.c
@@ -54,7 +54,7 @@ static int __kprobes branch_taken(unsigned int instr, struct pt_regs *regs)
*/
int __kprobes emulate_step(struct pt_regs *regs, unsigned int instr)
{
- unsigned int opcode, rd;
+ unsigned int opcode, rs, rb, rd, spr;
unsigned long int imm;
opcode = instr >> 26;
@@ -152,6 +152,49 @@ int __kprobes emulate_step(struct pt_regs *regs, unsigned int instr)
regs->nip &= 0xffffffffUL;
return 1;
#endif
+ case 0x26: /* mfcr */
+ regs->gpr[rd] = regs->ccr;
+ regs->gpr[rd] &= 0xffffffffUL;
+ goto mtspr_out;
+ case 0x2a6: /* mfspr */
+ spr = (instr >> 11) & 0x3ff;
+ switch (spr) {
+ case 0x20: /* mfxer */
+ regs->gpr[rd] = regs->xer;
+ regs->gpr[rd] &= 0xffffffffUL;
+ goto mtspr_out;
+ case 0x100: /* mflr */
+ regs->gpr[rd] = regs->link;
+ goto mtspr_out;
+ case 0x120: /* mfctr */
+ regs->gpr[rd] = regs->ctr;
+ goto mtspr_out;
+ }
+ break;
+ case 0x378: /* orx */
+ rs = (instr >> 21) & 0x1f;
+ rb = (instr >> 11) & 0x1f;
+ if (rs == rb) { /* mr */
+ rd = (instr >> 16) & 0x1f;
+ regs->gpr[rd] = regs->gpr[rs];
+ goto mtspr_out;
+ }
+ break;
+ case 0x3a6: /* mtspr */
+ spr = (instr >> 11) & 0x3ff;
+ switch (spr) {
+ case 0x20: /* mtxer */
+ regs->xer = (regs->gpr[rd] & 0xffffffffUL);
+ goto mtspr_out;
+ case 0x100: /* mtlr */
+ regs->link = regs->gpr[rd];
+ goto mtspr_out;
+ case 0x120: /* mtctr */
+ regs->ctr = regs->gpr[rd];
+mtspr_out:
+ regs->nip += 4;
+ return 1;
+ }
}
}
return 0;