KVM: x86 emulator: Use opcode::execute for CMPXCHG
CMPXCHG: 0F B0, 0F B1 Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
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e1e210b0a7
Коммит
e940b5c20f
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@ -1832,6 +1832,24 @@ static int em_ret_far(struct x86_emulate_ctxt *ctxt)
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return rc;
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}
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static int em_cmpxchg(struct x86_emulate_ctxt *ctxt)
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{
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/* Save real source value, then compare EAX against destination. */
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ctxt->src.orig_val = ctxt->src.val;
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ctxt->src.val = ctxt->regs[VCPU_REGS_RAX];
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emulate_2op_SrcV(ctxt, "cmp");
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if (ctxt->eflags & EFLG_ZF) {
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/* Success: write back to memory. */
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ctxt->dst.val = ctxt->src.orig_val;
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} else {
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/* Failure: write the value we saw to EAX. */
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ctxt->dst.type = OP_REG;
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ctxt->dst.addr.reg = (unsigned long *)&ctxt->regs[VCPU_REGS_RAX];
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}
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return X86EMUL_CONTINUE;
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}
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static int em_lseg(struct x86_emulate_ctxt *ctxt)
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{
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int seg = ctxt->src2.val;
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@ -3400,7 +3418,7 @@ static struct opcode twobyte_table[256] = {
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D(DstMem | SrcReg | Src2CL | ModRM),
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D(ModRM), I(DstReg | SrcMem | ModRM, em_imul),
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/* 0xB0 - 0xB7 */
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D2bv(DstMem | SrcReg | ModRM | Lock | PageTable),
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I2bv(DstMem | SrcReg | ModRM | Lock | PageTable, em_cmpxchg),
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I(DstReg | SrcMemFAddr | ModRM | Src2SS, em_lseg),
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I(DstMem | SrcReg | ModRM | BitOp | Lock, em_btr),
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I(DstReg | SrcMemFAddr | ModRM | Src2FS, em_lseg),
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@ -4153,23 +4171,6 @@ twobyte_insn:
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break;
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case 0xae: /* clflush */
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break;
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case 0xb0 ... 0xb1: /* cmpxchg */
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/*
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* Save real source value, then compare EAX against
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* destination.
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*/
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ctxt->src.orig_val = ctxt->src.val;
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ctxt->src.val = ctxt->regs[VCPU_REGS_RAX];
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emulate_2op_SrcV(ctxt, "cmp");
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if (ctxt->eflags & EFLG_ZF) {
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/* Success: write back to memory. */
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ctxt->dst.val = ctxt->src.orig_val;
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} else {
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/* Failure: write the value we saw to EAX. */
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ctxt->dst.type = OP_REG;
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ctxt->dst.addr.reg = (unsigned long *)&ctxt->regs[VCPU_REGS_RAX];
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}
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break;
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case 0xb6 ... 0xb7: /* movzx */
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ctxt->dst.bytes = ctxt->op_bytes;
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ctxt->dst.val = (ctxt->d & ByteOp) ? (u8) ctxt->src.val
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