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KVM: x86 emulator: implement CWD (opcode 99) 

Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Avi Kivity 2010-08-19 15:13:00 +03:00
parent d46164dbd9
commit 6142914280
1 changed files with 14 additions and 1 deletions
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15
arch/x86/kvm/emulate.c
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@ -2280,6 +2280,18 @@ static int em_imul_3op(struct x86_emulate_ctxt *ctxt)
return em_imul(ctxt);
}
static int em_cwd(struct x86_emulate_ctxt *ctxt)
{
struct decode_cache *c = &ctxt->decode;
c->dst.type = OP_REG;
c->dst.bytes = c->src.bytes;
c->dst.addr.reg = &c->regs[VCPU_REGS_RDX];
c->dst.val = ~((c->src.val >> (c->src.bytes * 8 - 1)) - 1);
return X86EMUL_CONTINUE;
}
static int em_rdtsc(struct x86_emulate_ctxt *ctxt)
{
unsigned cpl = ctxt->ops->cpl(ctxt->vcpu);
@ -2425,7 +2437,8 @@ static struct opcode opcode_table[256] = {
/* 0x90 - 0x97 */
X8(D(SrcAcc | DstReg)),
/* 0x98 - 0x9F */
D(DstAcc | SrcNone), N, D(SrcImmFAddr | No64), N,
D(DstAcc | SrcNone), I(ImplicitOps | SrcAcc, em_cwd),
D(SrcImmFAddr | No64), N,
D(ImplicitOps | Stack), D(ImplicitOps | Stack), N, N,
/* 0xA0 - 0xA7 */
D(ByteOp | DstAcc | SrcMem | Mov | MemAbs), D(DstAcc | SrcMem | Mov | MemAbs),