diff options
| author | Ananth N Mavinakayanahalli <ananth@in.ibm.com> | 2007-04-18 15:56:38 +1000 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2007-04-24 21:31:57 +1000 |
| commit | 6888199f7fe5ea496f48bb6de67b9b7f05b8071b (patch) | |
| tree | 9d276fa0ac794226110b1c4676666f8b0df8650c /arch/powerpc/lib | |
| parent | 5cc5133a29fab993f0b40c03e975bc5458ece507 (diff) | |
| download | linux-6888199f7fe5ea496f48bb6de67b9b7f05b8071b.tar.bz2 | |
[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/powerpc/lib')
| -rw-r--r-- | arch/powerpc/lib/sstep.c | 45 |
1 files changed, 44 insertions, 1 deletions
diff --git a/arch/powerpc/lib/sstep.c b/arch/powerpc/lib/sstep.c index 7e8ded051b5b..4aae0c387645 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; |