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KVM: x86 emulator: implement DAS (opcode 2F)

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Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Avi Kivity 2010-08-18 14:16:35 +03:00
parent fb2c264105
commit 7af04fc05c
1 changed files with 41 additions and 1 deletions
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42
arch/x86/kvm/emulate.c
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@ -2175,6 +2175,45 @@ static int em_push(struct x86_emulate_ctxt *ctxt)
return X86EMUL_CONTINUE;
}
static int em_das(struct x86_emulate_ctxt *ctxt)
{
struct decode_cache *c = &ctxt->decode;
u8 al, old_al;
bool af, cf, old_cf;
cf = ctxt->eflags & X86_EFLAGS_CF;
al = c->dst.val;
old_al = al;
old_cf = cf;
cf = false;
af = ctxt->eflags & X86_EFLAGS_AF;
if ((al & 0x0f) > 9 || af) {
al -= 6;
cf = old_cf | (al >= 250);
af = true;
} else {
af = false;
}
if (old_al > 0x99 || old_cf) {
al -= 0x60;
cf = true;
}
c->dst.val = al;
/* Set PF, ZF, SF */
c->src.type = OP_IMM;
c->src.val = 0;
c->src.bytes = 1;
emulate_2op_SrcV("or", c->src, c->dst, ctxt->eflags);
ctxt->eflags &= ~(X86_EFLAGS_AF | X86_EFLAGS_CF);
if (cf)
ctxt->eflags |= X86_EFLAGS_CF;
if (af)
ctxt->eflags |= X86_EFLAGS_AF;
return X86EMUL_CONTINUE;
}
#define D(_y) { .flags = (_y) }
#define N D(0)
#define G(_f, _g) { .flags = ((_f) | Group), .u.group = (_g) }
@ -2258,7 +2297,8 @@ static struct opcode opcode_table[256] = {
/* 0x28 - 0x2F */
D(ByteOp | DstMem | SrcReg | ModRM | Lock), D(DstMem | SrcReg | ModRM | Lock),
D(ByteOp | DstReg | SrcMem | ModRM), D(DstReg | SrcMem | ModRM),
D(ByteOp | DstAcc | SrcImmByte), D(DstAcc | SrcImm), N, N,
D(ByteOp | DstAcc | SrcImmByte), D(DstAcc | SrcImm),
N, I(ByteOp | DstAcc | No64, em_das),
/* 0x30 - 0x37 */
D(ByteOp | DstMem | SrcReg | ModRM | Lock), D(DstMem | SrcReg | ModRM | Lock),
D(ByteOp | DstReg | SrcMem | ModRM), D(DstReg | SrcMem | ModRM),