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KVM: x86 emulator: Use DstAcc for 'and'

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For instruction 'and al,imm' we use DstAcc instead of doing
the emulation directly into the instruction's opcode.

Signed-off-by: Guillaume Thouvenin <guillaume.thouvenin@ext.bull.net>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Guillaume Thouvenin 2008-09-12 13:52:18 +02:00 committed by Avi Kivity
parent 8a9fee67fb
commit aa3a816b6d
1 changed files with 2 additions and 19 deletions
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21
arch/x86/kvm/x86_emulate.c
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@ -96,7 +96,7 @@ static u16 opcode_table[256] = {
/* 0x20 - 0x27 */
ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM,
ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM,
SrcImmByte, SrcImm, 0, 0,
DstAcc | SrcImmByte, DstAcc | SrcImm, 0, 0,
/* 0x28 - 0x2F */
ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM,
ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM,
@ -1392,27 +1392,10 @@ special_insn:
sbb: /* sbb */
emulate_2op_SrcV("sbb", c->src, c->dst, ctxt->eflags);
break;
case 0x20 ... 0x23:
case 0x20 ... 0x25:
and: /* and */
emulate_2op_SrcV("and", c->src, c->dst, ctxt->eflags);
break;
case 0x24: /* and al imm8 */
c->dst.type = OP_REG;
c->dst.ptr = &c->regs[VCPU_REGS_RAX];
c->dst.val = *(u8 *)c->dst.ptr;
c->dst.bytes = 1;
c->dst.orig_val = c->dst.val;
goto and;
case 0x25: /* and ax imm16, or eax imm32 */
c->dst.type = OP_REG;
c->dst.bytes = c->op_bytes;
c->dst.ptr = &c->regs[VCPU_REGS_RAX];
if (c->op_bytes == 2)
c->dst.val = *(u16 *)c->dst.ptr;
else
c->dst.val = *(u32 *)c->dst.ptr;
c->dst.orig_val = c->dst.val;
goto and;
case 0x28 ... 0x2d:
sub: /* sub */
emulate_2op_SrcV("sub", c->src, c->dst, ctxt->eflags);