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KVM: x86 emulator: re-implementing 'mov AL,moffs' instruction decoding 

This patch change to use DstAcc for decoding 'mov AL, moffs'
and introduced SrcAcc for decoding 'mov moffs, AL'.

Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Wei Yongjun 2010-07-07 17:43:35 +08:00 committed by Avi Kivity
parent 07cbc6c185
commit 5d55f299f9
1 changed files with 23 additions and 9 deletions
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32
arch/x86/kvm/emulate.c
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@ -70,6 +70,7 @@
#define SrcSI (0xa<<4) /* Source is in the DS:RSI */
#define SrcImmFAddr (0xb<<4) /* Source is immediate far address */
#define SrcMemFAddr (0xc<<4) /* Source is far address in memory */
#define SrcAcc (0xd<<4) /* Source Accumulator */
#define SrcMask (0xf<<4)
/* Generic ModRM decode. */
#define ModRM (1<<8)
@ -177,8 +178,8 @@ static u32 opcode_table[256] = {
0, 0, SrcImmFAddr | No64, 0,
ImplicitOps | Stack, ImplicitOps | Stack, 0, 0,
/* 0xA0 - 0xA7 */
ByteOp | DstReg | SrcMem | Mov | MemAbs, DstReg | SrcMem | Mov | MemAbs,
ByteOp | DstMem | SrcReg | Mov | MemAbs, DstMem | SrcReg | Mov | MemAbs,
ByteOp | DstAcc | SrcMem | Mov | MemAbs, DstAcc | SrcMem | Mov | MemAbs,
ByteOp | DstMem | SrcAcc | Mov | MemAbs, DstMem | SrcAcc | Mov | MemAbs,
ByteOp | SrcSI | DstDI | Mov | String, SrcSI | DstDI | Mov | String,
ByteOp | SrcSI | DstDI | String, SrcSI | DstDI | String,
/* 0xA8 - 0xAF */
@ -1186,6 +1187,25 @@ done_prefixes:
else
c->src.val = insn_fetch(u8, 1, c->eip);
break;
case SrcAcc:
c->src.type = OP_REG;
c->src.bytes = (c->d & ByteOp) ? 1 : c->op_bytes;
c->src.ptr = &c->regs[VCPU_REGS_RAX];
switch (c->src.bytes) {
case 1:
c->src.val = *(u8 *)c->src.ptr;
break;
case 2:
c->src.val = *(u16 *)c->src.ptr;
break;
case 4:
c->src.val = *(u32 *)c->src.ptr;
break;
case 8:
c->src.val = *(u64 *)c->src.ptr;
break;
}
break;
case SrcOne:
c->src.bytes = 1;
c->src.val = 1;
@ -2854,13 +2874,7 @@ special_insn:
if (rc != X86EMUL_CONTINUE)
goto done;
break;
case 0xa0 ... 0xa1: /* mov */
c->dst.ptr = (unsigned long *)&c->regs[VCPU_REGS_RAX];
c->dst.val = c->src.val;
break;
case 0xa2 ... 0xa3: /* mov */
c->dst.val = (unsigned long)c->regs[VCPU_REGS_RAX];
break;
case 0xa0 ... 0xa3: /* mov */
case 0xa4 ... 0xa5: /* movs */
goto mov;
case 0xa6 ... 0xa7: /* cmps */