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KVM: x86 emulator: use single stage decoding for mov instructions 

Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Avi Kivity 2010-08-03 14:46:56 +03:00
parent e90aa41e6c
commit b9eac5f4d1
1 changed files with 18 additions and 24 deletions
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42
arch/x86/kvm/emulate.c
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@ -2378,6 +2378,13 @@ static int em_rdtsc(struct x86_emulate_ctxt *ctxt)
return X86EMUL_CONTINUE;
}
static int em_mov(struct x86_emulate_ctxt *ctxt)
{
struct decode_cache *c = &ctxt->decode;
c->dst.val = c->src.val;
return X86EMUL_CONTINUE;
}
#define D(_y) { .flags = (_y) }
#define N D(0)
#define G(_f, _g) { .flags = ((_f) | Group), .u.group = (_g) }
@ -2489,8 +2496,8 @@ static struct opcode opcode_table[256] = {
G(DstMem | SrcImmByte | ModRM | Group, group1),
D2bv(DstMem | SrcReg | ModRM), D2bv(DstMem | SrcReg | ModRM | Lock),
/* 0x88 - 0x8F */
D2bv(DstMem | SrcReg | ModRM | Mov),
D2bv(DstReg | SrcMem | ModRM | Mov),
I2bv(DstMem | SrcReg | ModRM | Mov, em_mov),
I2bv(DstReg | SrcMem | ModRM | Mov, em_mov),
D(DstMem | SrcNone | ModRM | Mov), D(ModRM | SrcMem | NoAccess | DstReg),
D(ImplicitOps | SrcMem16 | ModRM), G(0, group1A),
/* 0x90 - 0x97 */
@ -2500,24 +2507,25 @@ static struct opcode opcode_table[256] = {
I(SrcImmFAddr | No64, em_call_far), N,
D(ImplicitOps | Stack), D(ImplicitOps | Stack), N, N,
/* 0xA0 - 0xA7 */
D2bv(DstAcc | SrcMem | Mov | MemAbs),
D2bv(DstMem | SrcAcc | Mov | MemAbs),
D2bv(SrcSI | DstDI | Mov | String), D2bv(SrcSI | DstDI | String),
I2bv(DstAcc | SrcMem | Mov | MemAbs, em_mov),
I2bv(DstMem | SrcAcc | Mov | MemAbs, em_mov),
I2bv(SrcSI | DstDI | Mov | String, em_mov),
D2bv(SrcSI | DstDI | String),
/* 0xA8 - 0xAF */
D2bv(DstAcc | SrcImm),
D2bv(SrcAcc | DstDI | Mov | String),
D2bv(SrcSI | DstAcc | Mov | String),
I2bv(SrcAcc | DstDI | Mov | String, em_mov),
I2bv(SrcSI | DstAcc | Mov | String, em_mov),
D2bv(SrcAcc | DstDI | String),
/* 0xB0 - 0xB7 */
X8(D(ByteOp | DstReg | SrcImm | Mov)),
X8(I(ByteOp | DstReg | SrcImm | Mov, em_mov)),
/* 0xB8 - 0xBF */
X8(D(DstReg | SrcImm | Mov)),
X8(I(DstReg | SrcImm | Mov, em_mov)),
/* 0xC0 - 0xC7 */
D2bv(DstMem | SrcImmByte | ModRM),
I(ImplicitOps | Stack | SrcImmU16, em_ret_near_imm),
D(ImplicitOps | Stack),
D(DstReg | SrcMemFAddr | ModRM | No64), D(DstReg | SrcMemFAddr | ModRM | No64),
D2bv(DstMem | SrcImm | ModRM | Mov),
I2bv(DstMem | SrcImm | ModRM | Mov, em_mov),
/* 0xC8 - 0xCF */
N, N, N, D(ImplicitOps | Stack),
D(ImplicitOps), D(SrcImmByte), D(ImplicitOps | No64), D(ImplicitOps),
@ -3212,8 +3220,6 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt)
c->dst.val = c->src.orig_val;
c->lock_prefix = 1;
break;
case 0x88 ... 0x8b: /* mov */
goto mov;
case 0x8c: /* mov r/m, sreg */
if (c->modrm_reg > VCPU_SREG_GS) {
emulate_ud(ctxt);
@ -3271,22 +3277,14 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt)
if (rc != X86EMUL_CONTINUE)
goto done;
break;
case 0xa0 ... 0xa3: /* mov */
case 0xa4 ... 0xa5: /* movs */
goto mov;
case 0xa6 ... 0xa7: /* cmps */
c->dst.type = OP_NONE; /* Disable writeback. */
DPRINTF("cmps: mem1=0x%p mem2=0x%p\n", c->src.addr.mem, c->dst.addr.mem);
goto cmp;
case 0xa8 ... 0xa9: /* test ax, imm */
goto test;
case 0xaa ... 0xab: /* stos */
case 0xac ... 0xad: /* lods */
goto mov;
case 0xae ... 0xaf: /* scas */
goto cmp;
case 0xb0 ... 0xbf: /* mov r, imm */
goto mov;
case 0xc0 ... 0xc1:
emulate_grp2(ctxt);
break;
@ -3305,10 +3303,6 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt)
if (rc != X86EMUL_CONTINUE)
goto done;
break;
case 0xc6 ... 0xc7: /* mov (sole member of Grp11) */
mov:
c->dst.val = c->src.val;
break;
case 0xcb: /* ret far */
rc = emulate_ret_far(ctxt, ops);
if (rc != X86EMUL_CONTINUE)