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authorAvi Kivity <avi@redhat.com>2009-01-05 11:12:40 +0200
committerAvi Kivity <avi@redhat.com>2009-03-24 11:03:00 +0200
commit350f69dcd169d536307aa4a8c38c480e3a51c0db (patch)
tree9c8ba8c8931f8e8fc7b22bca423ab25724354303 /arch
parent10f32d84c750ccf8c0afb3a4ea9d4059aa3e9ffc (diff)
KVM: x86 emulator: Make emulate_pop() a little more generic
Allow emulate_pop() to read into arbitrary memory rather than just the source operand. Needed for complicated instructions like far returns. Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kvm/x86_emulate.c15
1 files changed, 6 insertions, 9 deletions
diff --git a/arch/x86/kvm/x86_emulate.c b/arch/x86/kvm/x86_emulate.c
index 54fb09889a8..94459f313f1 100644
--- a/arch/x86/kvm/x86_emulate.c
+++ b/arch/x86/kvm/x86_emulate.c
@@ -1136,18 +1136,19 @@ static inline void emulate_push(struct x86_emulate_ctxt *ctxt)
}
static int emulate_pop(struct x86_emulate_ctxt *ctxt,
- struct x86_emulate_ops *ops)
+ struct x86_emulate_ops *ops,
+ void *dest, int len)
{
struct decode_cache *c = &ctxt->decode;
int rc;
rc = ops->read_emulated(register_address(c, ss_base(ctxt),
c->regs[VCPU_REGS_RSP]),
- &c->src.val, c->src.bytes, ctxt->vcpu);
+ dest, len, ctxt->vcpu);
if (rc != 0)
return rc;
- register_address_increment(c, &c->regs[VCPU_REGS_RSP], c->src.bytes);
+ register_address_increment(c, &c->regs[VCPU_REGS_RSP], len);
return rc;
}
@@ -1157,11 +1158,9 @@ static inline int emulate_grp1a(struct x86_emulate_ctxt *ctxt,
struct decode_cache *c = &ctxt->decode;
int rc;
- c->src.bytes = c->dst.bytes;
- rc = emulate_pop(ctxt, ops);
+ rc = emulate_pop(ctxt, ops, &c->dst.val, c->dst.bytes);
if (rc != 0)
return rc;
- c->dst.val = c->src.val;
return 0;
}
@@ -1467,11 +1466,9 @@ special_insn:
break;
case 0x58 ... 0x5f: /* pop reg */
pop_instruction:
- c->src.bytes = c->op_bytes;
- rc = emulate_pop(ctxt, ops);
+ rc = emulate_pop(ctxt, ops, &c->dst.val, c->op_bytes);
if (rc != 0)
goto done;
- c->dst.val = c->src.val;
break;
case 0x63: /* movsxd */
if (ctxt->mode != X86EMUL_MODE_PROT64)