[PATCH v2 17/26] KVM: x86 emulator: split push logic from push opcode emulation

Avi Kivity
2012-06-27T15:20:12Z

This allows us to reuse the code without populating ctxt->src and
overriding ctxt->op_bytes.

Signed-off-by: Avi Kivity <avi@redhat.com>
---
arch/x86/kvm/emulate.c | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 30f4912..acc647d 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -1505,17 +1505,22 @@ static int writeback(struct x86_emulate_ctxt *ctxt)
return X86EMUL_CONTINUE;
}

-static int em_push(struct x86_emulate_ctxt *ctxt)
+static int push(struct x86_emulate_ctxt *ctxt, void *data, int bytes)
{
struct segmented_address addr;

- register_address_increment(ctxt, &ctxt->regs[VCPU_REGS_RSP], -ctxt->op_bytes);
+ register_address_increment(ctxt, &ctxt->regs[VCPU_REGS_RSP], -bytes);
addr.ea = register_address(ctxt, ctxt->regs[VCPU_REGS_RSP]);
addr.seg = VCPU_SREG_SS;

+ return segmented_write(ctxt, addr, data, bytes);
+}
+
+static int em_push(struct x86_emulate_ctxt *ctxt)
+{
/* Disable writeback. */
ctxt->dst.type = OP_NONE;
- return segmented_write(ctxt, addr, &ctxt->src.val, ctxt->op_bytes);
+ return push(ctxt, &ctxt->src.val, ctxt->op_bytes);
}

static int emulate_pop(struct x86_emulate_ctxt *ctxt,
--
1.7.11