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KVM: x86 emulator: split push logic from push opcode emulation 

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

Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Avi Kivity 2012-06-12 20:19:40 +03:00
parent 361cad2b50
commit 51ddff50cb
1 changed files with 8 additions and 3 deletions
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11
arch/x86/kvm/emulate.c
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@ -1505,17 +1505,22 @@ static int writeback(struct x86_emulate_ctxt *ctxt)
return X86EMUL_CONTINUE; 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; 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.ea = register_address(ctxt, ctxt->regs[VCPU_REGS_RSP]);
addr.seg = VCPU_SREG_SS; addr.seg = VCPU_SREG_SS;
return segmented_write(ctxt, addr, data, bytes);
}
static int em_push(struct x86_emulate_ctxt *ctxt)
{
/* Disable writeback. */ /* Disable writeback. */
ctxt->dst.type = OP_NONE; 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, static int emulate_pop(struct x86_emulate_ctxt *ctxt,