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KVM: x86 emulator: trap and propagate #DE from DIV and IDIV 

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Avi Kivity 2010-08-26 11:59:01 +03:00
parent f6b3597bde
commit 34d1f4905e
1 changed files with 16 additions and 4 deletions
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20
arch/x86/kvm/emulate.c
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@ -504,6 +504,12 @@ static void emulate_ts(struct x86_emulate_ctxt *ctxt, int err)
emulate_exception(ctxt, TS_VECTOR, err, true);
}
static int emulate_de(struct x86_emulate_ctxt *ctxt)
{
emulate_exception(ctxt, DE_VECTOR, 0, false);
return X86EMUL_PROPAGATE_FAULT;
}
static int do_fetch_insn_byte(struct x86_emulate_ctxt *ctxt,
struct x86_emulate_ops *ops,
unsigned long eip, u8 *dest)
@ -1458,6 +1464,7 @@ static inline int emulate_grp3(struct x86_emulate_ctxt *ctxt,
struct decode_cache *c = &ctxt->decode;
unsigned long *rax = &c->regs[VCPU_REGS_RAX];
unsigned long *rdx = &c->regs[VCPU_REGS_RDX];
u8 de = 0;
switch (c->modrm_reg) {
case 0 ... 1: /* test */
@ -1476,14 +1483,18 @@ static inline int emulate_grp3(struct x86_emulate_ctxt *ctxt,
emulate_1op_rax_rdx("imul", c->src, *rax, *rdx, ctxt->eflags);
break;
case 6: /* div */
emulate_1op_rax_rdx("div", c->src, *rax, *rdx, ctxt->eflags);
emulate_1op_rax_rdx_ex("div", c->src, *rax, *rdx,
ctxt->eflags, de);
break;
case 7: /* idiv */
emulate_1op_rax_rdx("idiv", c->src, *rax, *rdx, ctxt->eflags);
emulate_1op_rax_rdx_ex("idiv", c->src, *rax, *rdx,
ctxt->eflags, de);
break;
default:
return X86EMUL_UNHANDLEABLE;
}
if (de)
return emulate_de(ctxt);
return X86EMUL_CONTINUE;
}
@ -3413,8 +3424,9 @@ special_insn:
ctxt->eflags ^= EFLG_CF;
break;
case 0xf6 ... 0xf7: /* Grp3 */
if (emulate_grp3(ctxt, ops) != X86EMUL_CONTINUE)
goto cannot_emulate;
rc = emulate_grp3(ctxt, ops);
if (rc != X86EMUL_CONTINUE)
goto done;
break;
case 0xf8: /* clc */
ctxt->eflags &= ~EFLG_CF;