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KVM: x86 emulator: Group decoding for groups 4 and 5 

Add group decoding support for opcode 0xfe (group 4) and 0xff (group 5).

Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Avi Kivity 2008-01-18 13:12:26 +02:00
parent 7d858a19ef
commit fd60754e4f
1 changed files with 10 additions and 30 deletions
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40
arch/x86/kvm/x86_emulate.c
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@ -70,7 +70,7 @@
#define GroupMask 0xff /* Group number stored in bits 0:7 */
enum {
Group1A, Group3_Byte, Group3,
Group1A, Group3_Byte, Group3, Group4, Group5,
};
static u16 opcode_table[256] = {
@ -174,7 +174,7 @@ static u16 opcode_table[256] = {
ImplicitOps, ImplicitOps, Group | Group3_Byte, Group | Group3,
/* 0xF8 - 0xFF */
ImplicitOps, 0, ImplicitOps, ImplicitOps,
0, 0, ByteOp | DstMem | SrcNone | ModRM, DstMem | SrcNone | ModRM
0, 0, Group | Group4, Group | Group5,
};
static u16 twobyte_table[256] = {
@ -246,6 +246,12 @@ static u16 group_table[] = {
DstMem | SrcImm | ModRM | SrcImm, 0,
DstMem | SrcNone | ModRM, ByteOp | DstMem | SrcNone | ModRM,
0, 0, 0, 0,
[Group4*8] =
ByteOp | DstMem | SrcNone | ModRM, ByteOp | DstMem | SrcNone | ModRM,
0, 0, 0, 0, 0, 0,
[Group5*8] =
DstMem | SrcNone | ModRM, DstMem | SrcNone | ModRM, 0, 0,
SrcMem | ModRM, 0, SrcMem | ModRM | Stack, 0,
};
static u16 group2_table[] = {
@ -1097,7 +1103,6 @@ static inline int emulate_grp45(struct x86_emulate_ctxt *ctxt,
struct x86_emulate_ops *ops)
{
struct decode_cache *c = &ctxt->decode;
int rc;
switch (c->modrm_reg) {
case 0: /* inc */
@ -1107,36 +1112,11 @@ static inline int emulate_grp45(struct x86_emulate_ctxt *ctxt,
emulate_1op("dec", c->dst, ctxt->eflags);
break;
case 4: /* jmp abs */
if (c->b == 0xff)
c->eip = c->dst.val;
else {
DPRINTF("Cannot emulate %02x\n", c->b);
return X86EMUL_UNHANDLEABLE;
}
c->eip = c->src.val;
break;
case 6: /* push */
/* 64-bit mode: PUSH always pushes a 64-bit operand. */
if (ctxt->mode == X86EMUL_MODE_PROT64) {
c->dst.bytes = 8;
rc = ops->read_std((unsigned long)c->dst.ptr,
&c->dst.val, 8, ctxt->vcpu);
if (rc != 0)
return rc;
}
register_address_increment(c->regs[VCPU_REGS_RSP],
-c->dst.bytes);
rc = ops->write_emulated(register_address(ctxt->ss_base,
c->regs[VCPU_REGS_RSP]), &c->dst.val,
c->dst.bytes, ctxt->vcpu);
if (rc != 0)
return rc;
c->dst.type = OP_NONE;
emulate_push(ctxt);
break;
default:
DPRINTF("Cannot emulate %02x\n", c->b);
return X86EMUL_UNHANDLEABLE;
}
return 0;
}