linux-kernel - [PATCH 06/36] KVM: x86 emulator: Extract 'pop' sequence into a function

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Message-Id: <1229242029-13410-7-git-send-email-avi@redhat.com>
Date:	Sun, 14 Dec 2008 10:06:39 +0200
From:	Avi Kivity <avi@...hat.com>
To:	kvm@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH 06/36] KVM: x86 emulator: Extract 'pop' sequence into a function

Switch 'pop r/m' instruction to use the new function.

Signed-off-by: Avi Kivity <avi@...hat.com>
---
 arch/x86/kvm/x86_emulate.c |   21 +++++++++++++++++----
 1 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kvm/x86_emulate.c b/arch/x86/kvm/x86_emulate.c
index a11af6f..2555762 100644
--- a/arch/x86/kvm/x86_emulate.c
+++ b/arch/x86/kvm/x86_emulate.c
@@ -1057,20 +1057,33 @@ static inline void emulate_push(struct x86_emulate_ctxt *ctxt)
 					       c->regs[VCPU_REGS_RSP]);
 }
 
-static inline int emulate_grp1a(struct x86_emulate_ctxt *ctxt,
-				struct x86_emulate_ops *ops)
+static int emulate_pop(struct x86_emulate_ctxt *ctxt,
+		       struct x86_emulate_ops *ops)
 {
 	struct decode_cache *c = &ctxt->decode;
 	int rc;
 
 	rc = ops->read_std(register_address(c, ss_base(ctxt),
 					    c->regs[VCPU_REGS_RSP]),
-			   &c->dst.val, c->dst.bytes, ctxt->vcpu);
+			   &c->src.val, c->src.bytes, ctxt->vcpu);
 	if (rc != 0)
 		return rc;
 
-	register_address_increment(c, &c->regs[VCPU_REGS_RSP], c->dst.bytes);
+	register_address_increment(c, &c->regs[VCPU_REGS_RSP], c->src.bytes);
+	return rc;
+}
 
+static inline int emulate_grp1a(struct x86_emulate_ctxt *ctxt,
+				struct x86_emulate_ops *ops)
+{
+	struct decode_cache *c = &ctxt->decode;
+	int rc;
+
+	c->src.bytes = c->dst.bytes;
+	rc = emulate_pop(ctxt, ops);
+	if (rc != 0)
+		return rc;
+	c->dst.val = c->src.val;
 	return 0;
 }
 
-- 
1.6.0.3

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