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KVM: x86 emulator: fix pusha instruction emulation

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emulate pusha instruction only writeback the last
EDI register, but the other registers which need
to be writeback is ignored. This patch fixed it.

Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Wei Yongjun 2010-06-15 09:03:33 +08:00 committed by Avi Kivity
parent bd371396b3
commit c37eda1384
1 changed files with 73 additions and 60 deletions
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133
arch/x86/kvm/emulate.c
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@ -1553,6 +1553,64 @@ exception:
return X86EMUL_PROPAGATE_FAULT;
}
static inline int writeback(struct x86_emulate_ctxt *ctxt,
struct x86_emulate_ops *ops)
{
int rc;
struct decode_cache *c = &ctxt->decode;
u32 err;
switch (c->dst.type) {
case OP_REG:
/* The 4-byte case *is* correct:
* in 64-bit mode we zero-extend.
*/
switch (c->dst.bytes) {
case 1:
*(u8 *)c->dst.ptr = (u8)c->dst.val;
break;
case 2:
*(u16 *)c->dst.ptr = (u16)c->dst.val;
break;
case 4:
*c->dst.ptr = (u32)c->dst.val;
break; /* 64b: zero-ext */
case 8:
*c->dst.ptr = c->dst.val;
break;
}
break;
case OP_MEM:
if (c->lock_prefix)
rc = ops->cmpxchg_emulated(
(unsigned long)c->dst.ptr,
&c->dst.orig_val,
&c->dst.val,
c->dst.bytes,
&err,
ctxt->vcpu);
else
rc = ops->write_emulated(
(unsigned long)c->dst.ptr,
&c->dst.val,
c->dst.bytes,
&err,
ctxt->vcpu);
if (rc == X86EMUL_PROPAGATE_FAULT)
emulate_pf(ctxt,
(unsigned long)c->dst.ptr, err);
if (rc != X86EMUL_CONTINUE)
return rc;
break;
case OP_NONE:
/* no writeback */
break;
default:
break;
}
return X86EMUL_CONTINUE;
}
static inline void emulate_push(struct x86_emulate_ctxt *ctxt,
struct x86_emulate_ops *ops)
{
@ -1651,11 +1709,12 @@ static int emulate_pop_sreg(struct x86_emulate_ctxt *ctxt,
return rc;
}
static void emulate_pusha(struct x86_emulate_ctxt *ctxt,
static int emulate_pusha(struct x86_emulate_ctxt *ctxt,
struct x86_emulate_ops *ops)
{
struct decode_cache *c = &ctxt->decode;
unsigned long old_esp = c->regs[VCPU_REGS_RSP];
int rc = X86EMUL_CONTINUE;
int reg = VCPU_REGS_RAX;
while (reg <= VCPU_REGS_RDI) {
@ -1663,8 +1722,18 @@ static void emulate_pusha(struct x86_emulate_ctxt *ctxt,
(c->src.val = old_esp) : (c->src.val = c->regs[reg]);
emulate_push(ctxt, ops);
rc = writeback(ctxt, ops);
if (rc != X86EMUL_CONTINUE)
return rc;
++reg;
}
/* Disable writeback. */
c->dst.type = OP_NONE;
return rc;
}
static int emulate_popa(struct x86_emulate_ctxt *ctxt,
@ -1817,64 +1886,6 @@ static int emulate_ret_far(struct x86_emulate_ctxt *ctxt,
return rc;
}
static inline int writeback(struct x86_emulate_ctxt *ctxt,
struct x86_emulate_ops *ops)
{
int rc;
struct decode_cache *c = &ctxt->decode;
u32 err;
switch (c->dst.type) {
case OP_REG:
/* The 4-byte case *is* correct:
* in 64-bit mode we zero-extend.
*/
switch (c->dst.bytes) {
case 1:
*(u8 *)c->dst.ptr = (u8)c->dst.val;
break;
case 2:
*(u16 *)c->dst.ptr = (u16)c->dst.val;
break;
case 4:
*c->dst.ptr = (u32)c->dst.val;
break; /* 64b: zero-ext */
case 8:
*c->dst.ptr = c->dst.val;
break;
}
break;
case OP_MEM:
if (c->lock_prefix)
rc = ops->cmpxchg_emulated(
(unsigned long)c->dst.ptr,
&c->dst.orig_val,
&c->dst.val,
c->dst.bytes,
&err,
ctxt->vcpu);
else
rc = ops->write_emulated(
(unsigned long)c->dst.ptr,
&c->dst.val,
c->dst.bytes,
&err,
ctxt->vcpu);
if (rc == X86EMUL_PROPAGATE_FAULT)
emulate_pf(ctxt,
(unsigned long)c->dst.ptr, err);
if (rc != X86EMUL_CONTINUE)
return rc;
break;
case OP_NONE:
/* no writeback */
break;
default:
break;
}
return X86EMUL_CONTINUE;
}
static inline void
setup_syscalls_segments(struct x86_emulate_ctxt *ctxt,
struct x86_emulate_ops *ops, struct desc_struct *cs,
@ -2689,7 +2700,9 @@ special_insn:
goto done;
break;
case 0x60: /* pusha */
emulate_pusha(ctxt, ops);
rc = emulate_pusha(ctxt, ops);
if (rc != X86EMUL_CONTINUE)
goto done;
break;
case 0x61: /* popa */
rc = emulate_popa(ctxt, ops);