AcoSail/kernel_optimize_test
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KVM: x86 emulator: use SrcAcc to simplify xchg decoding

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Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Avi Kivity 2010-08-01 12:41:59 +03:00
parent 4515453964
commit 3d9e77dff8
1 changed files with 4 additions and 11 deletions
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15
arch/x86/kvm/emulate.c
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@ -2147,7 +2147,7 @@ static struct opcode opcode_table[256] = {
D(DstMem | SrcNone | ModRM | Mov), D(ModRM | DstReg),
D(ImplicitOps | SrcMem16 | ModRM), G(0, group1A),
/* 0x90 - 0x97 */
X8(D(DstReg)),
X8(D(SrcAcc | DstReg)),
/* 0x98 - 0x9F */
N, N, D(SrcImmFAddr | No64), N,
D(ImplicitOps | Stack), D(ImplicitOps | Stack), N, N,
@ -2932,16 +2932,9 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt)
if (rc != X86EMUL_CONTINUE)
goto done;
break;
case 0x90: /* nop / xchg r8,rax */
if (c->dst.addr.reg == &c->regs[VCPU_REGS_RAX]) {
c->dst.type = OP_NONE; /* nop */
break;
}
case 0x91 ... 0x97: /* xchg reg,rax */
c->src.type = OP_REG;
c->src.bytes = c->op_bytes;
c->src.addr.reg = &c->regs[VCPU_REGS_RAX];
c->src.val = *(c->src.addr.reg);
case 0x90 ... 0x97: /* nop / xchg reg, rax */
if (c->dst.addr.reg == &c->regs[VCPU_REGS_RAX])
goto done;
goto xchg;
case 0x9c: /* pushf */
c->src.val = (unsigned long) ctxt->eflags;