[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>
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5cc5133a29
Коммит
6888199f7f
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@ -54,7 +54,7 @@ static int __kprobes branch_taken(unsigned int instr, struct pt_regs *regs)
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*/
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int __kprobes emulate_step(struct pt_regs *regs, unsigned int instr)
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{
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unsigned int opcode, rd;
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unsigned int opcode, rs, rb, rd, spr;
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unsigned long int imm;
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opcode = instr >> 26;
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@ -152,6 +152,49 @@ int __kprobes emulate_step(struct pt_regs *regs, unsigned int instr)
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regs->nip &= 0xffffffffUL;
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return 1;
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#endif
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case 0x26: /* mfcr */
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regs->gpr[rd] = regs->ccr;
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regs->gpr[rd] &= 0xffffffffUL;
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goto mtspr_out;
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case 0x2a6: /* mfspr */
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spr = (instr >> 11) & 0x3ff;
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switch (spr) {
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case 0x20: /* mfxer */
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regs->gpr[rd] = regs->xer;
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regs->gpr[rd] &= 0xffffffffUL;
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goto mtspr_out;
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case 0x100: /* mflr */
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regs->gpr[rd] = regs->link;
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goto mtspr_out;
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case 0x120: /* mfctr */
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regs->gpr[rd] = regs->ctr;
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goto mtspr_out;
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}
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break;
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case 0x378: /* orx */
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rs = (instr >> 21) & 0x1f;
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rb = (instr >> 11) & 0x1f;
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if (rs == rb) { /* mr */
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rd = (instr >> 16) & 0x1f;
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regs->gpr[rd] = regs->gpr[rs];
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goto mtspr_out;
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}
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break;
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case 0x3a6: /* mtspr */
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spr = (instr >> 11) & 0x3ff;
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switch (spr) {
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case 0x20: /* mtxer */
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regs->xer = (regs->gpr[rd] & 0xffffffffUL);
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goto mtspr_out;
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case 0x100: /* mtlr */
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regs->link = regs->gpr[rd];
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goto mtspr_out;
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case 0x120: /* mtctr */
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regs->ctr = regs->gpr[rd];
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mtspr_out:
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regs->nip += 4;
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return 1;
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}
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}
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}
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return 0;
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