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KVM: x86 emulator: Add into, int, and int3 instructions (opcodes 0xcc-0xce) 

This adds support for int instructions to the emulator.

Signed-off-by: Mohammed Gamal <m.gamal005@gmail.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Mohammed Gamal 2010-08-04 14:38:06 +03:00 committed by Avi Kivity
parent 160ce1f1a8
commit 6e154e56b4
1 changed files with 78 additions and 0 deletions
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78
arch/x86/kvm/emulate.c
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@ -1180,6 +1180,67 @@ static int emulate_popa(struct x86_emulate_ctxt *ctxt,
return rc;
}
int emulate_int_real(struct x86_emulate_ctxt *ctxt,
struct x86_emulate_ops *ops, int irq)
{
struct decode_cache *c = &ctxt->decode;
int rc = X86EMUL_CONTINUE;
struct desc_ptr dt;
gva_t cs_addr;
gva_t eip_addr;
u16 cs, eip;
u32 err;
/* TODO: Add limit checks */
c->src.val = ctxt->eflags;
emulate_push(ctxt, ops);
ctxt->eflags &= ~(EFLG_IF | EFLG_TF | EFLG_AC);
c->src.val = ops->get_segment_selector(VCPU_SREG_CS, ctxt->vcpu);
emulate_push(ctxt, ops);
c->src.val = c->eip;
emulate_push(ctxt, ops);
ops->get_idt(&dt, ctxt->vcpu);
eip_addr = dt.address + (irq << 2);
cs_addr = dt.address + (irq << 2) + 2;
rc = ops->read_std(cs_addr, &cs, 2, ctxt->vcpu, &err);
if (rc != X86EMUL_CONTINUE)
return rc;
rc = ops->read_std(eip_addr, &eip, 2, ctxt->vcpu, &err);
if (rc != X86EMUL_CONTINUE)
return rc;
rc = load_segment_descriptor(ctxt, ops, cs, VCPU_SREG_CS);
if (rc != X86EMUL_CONTINUE)
return rc;
c->eip = eip;
return rc;
}
static int emulate_int(struct x86_emulate_ctxt *ctxt,
struct x86_emulate_ops *ops, int irq)
{
switch(ctxt->mode) {
case X86EMUL_MODE_REAL:
return emulate_int_real(ctxt, ops, irq);
case X86EMUL_MODE_VM86:
case X86EMUL_MODE_PROT16:
case X86EMUL_MODE_PROT32:
case X86EMUL_MODE_PROT64:
default:
/* Protected mode interrupts unimplemented yet */
return X86EMUL_UNHANDLEABLE;
}
}
static int emulate_iret_real(struct x86_emulate_ctxt *ctxt,
struct x86_emulate_ops *ops)
{
@ -2616,6 +2677,7 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt)
struct decode_cache *c = &ctxt->decode;
int rc = X86EMUL_CONTINUE;
int saved_dst_type = c->dst.type;
int irq; /* Used for int 3, int, and into */
ctxt->decode.mem_read.pos = 0;
@ -2960,6 +3022,22 @@ special_insn:
if (rc != X86EMUL_CONTINUE)
goto done;
break;
case 0xcc: /* int3 */
irq = 3;
goto do_interrupt;
case 0xcd: /* int n */
irq = c->src.val;
do_interrupt:
rc = emulate_int(ctxt, ops, irq);
if (rc != X86EMUL_CONTINUE)
goto done;
break;
case 0xce: /* into */
if (ctxt->eflags & EFLG_OF) {
irq = 4;
goto do_interrupt;
}
break;
case 0xcf: /* iret */
rc = emulate_iret(ctxt, ops);