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KVM: x86 emulator: Use opcode::execute for XCHG(86/87)

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In addition, replace one "goto xchg" with an em_xchg() call.

Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Takuya Yoshikawa 2011-05-29 21:59:09 +09:00 committed by Avi Kivity
parent 9f21ca599c
commit e4f973ae91
1 changed files with 17 additions and 14 deletions
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31
arch/x86/kvm/emulate.c
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@ -2613,6 +2613,20 @@ static int em_test(struct x86_emulate_ctxt *ctxt)
return X86EMUL_CONTINUE;
}
static int em_xchg(struct x86_emulate_ctxt *ctxt)
{
struct decode_cache *c = &ctxt->decode;
/* Write back the register source. */
c->src.val = c->dst.val;
write_register_operand(&c->src);
/* Write back the memory destination with implicit LOCK prefix. */
c->dst.val = c->src.orig_val;
c->lock_prefix = 1;
return X86EMUL_CONTINUE;
}
static int em_imul(struct x86_emulate_ctxt *ctxt)
{
struct decode_cache *c = &ctxt->decode;
@ -3144,7 +3158,7 @@ static struct opcode opcode_table[256] = {
G(ByteOp | DstMem | SrcImm | ModRM | No64 | Group, group1),
G(DstMem | SrcImmByte | ModRM | Group, group1),
I2bv(DstMem | SrcReg | ModRM, em_test),
D2bv(DstMem | SrcReg | ModRM | Lock),
I2bv(DstMem | SrcReg | ModRM | Lock, em_xchg),
/* 0x88 - 0x8F */
I2bv(DstMem | SrcReg | ModRM | Mov, em_mov),
I2bv(DstReg | SrcMem | ModRM | Mov, em_mov),
@ -3882,18 +3896,6 @@ special_insn:
if (test_cc(c->b, ctxt->eflags))
jmp_rel(c, c->src.val);
break;
case 0x86 ... 0x87: /* xchg */
xchg:
/* Write back the register source. */
c->src.val = c->dst.val;
write_register_operand(&c->src);
/*
* Write back the memory destination with implicit LOCK
* prefix.
*/
c->dst.val = c->src.orig_val;
c->lock_prefix = 1;
break;
case 0x8c: /* mov r/m, sreg */
if (c->modrm_reg > VCPU_SREG_GS) {
rc = emulate_ud(ctxt);
@ -3929,7 +3931,8 @@ special_insn:
case 0x90 ... 0x97: /* nop / xchg reg, rax */
if (c->dst.addr.reg == &c->regs[VCPU_REGS_RAX])
break;
goto xchg;
rc = em_xchg(ctxt);
break;
case 0x98: /* cbw/cwde/cdqe */
switch (c->op_bytes) {
case 2: c->dst.val = (s8)c->dst.val; break;