From b8f81c62a29b59d8de18476726cf2b7ac7cea1f5 Mon Sep 17 00:00:00 2001
From: Gabe Black <gblack@eecs.umich.edu>
Date: Sun, 19 Apr 2009 04:56:22 -0700
Subject: [PATCH] X86: Implement a locking version of XCHG.

---
 .../insts/general_purpose/data_transfer/xchg.py   | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/src/arch/x86/isa/insts/general_purpose/data_transfer/xchg.py b/src/arch/x86/isa/insts/general_purpose/data_transfer/xchg.py
index 3f243f5d8..521be95e5 100644
--- a/src/arch/x86/isa/insts/general_purpose/data_transfer/xchg.py
+++ b/src/arch/x86/isa/insts/general_purpose/data_transfer/xchg.py
@@ -95,4 +95,19 @@ def macroop XCHG_P_R
     st reg, seg, riprel, disp
     mov reg, reg, t1
 };
+
+def macroop XCHG_LOCKED_M_R
+{
+    ldstl t1, seg, sib, disp
+    stul reg, seg, sib, disp
+    mov reg, reg, t1
+};
+
+def macroop XCHG_LOCKED_P_R
+{
+    rdip t7
+    ldstl t1, seg, riprel, disp
+    stul reg, seg, riprel, disp
+    mov reg, reg, t1
+};
 '''