diff --git a/src/arch/x86/isa/insts/general_purpose/arithmetic/add_and_subtract.py b/src/arch/x86/isa/insts/general_purpose/arithmetic/add_and_subtract.py
index e58fc00d7..577c50367 100644
--- a/src/arch/x86/isa/insts/general_purpose/arithmetic/add_and_subtract.py
+++ b/src/arch/x86/isa/insts/general_purpose/arithmetic/add_and_subtract.py
@@ -82,6 +82,23 @@ def macroop ADD_P_I
     st t1, seg, riprel, disp
 };
 
+def macroop ADD_LOCKED_M_I
+{
+    limm t2, imm
+    ldstl t1, seg, sib, disp
+    add t1, t1, t2, flags=(OF,SF,ZF,AF,PF,CF)
+    stul t1, seg, sib, disp
+};
+
+def macroop ADD_LOCKED_P_I
+{
+    rdip t7
+    limm t2, imm
+    ldstl t1, seg, riprel, disp
+    add t1, t1, t2, flags=(OF,SF,ZF,AF,PF,CF)
+    stul t1, seg, riprel, disp
+};
+
 def macroop ADD_M_R
 {
     ldst t1, seg, sib, disp
@@ -97,6 +114,21 @@ def macroop ADD_P_R
     st t1, seg, riprel, disp
 };
 
+def macroop ADD_LOCKED_M_R
+{
+    ldstl t1, seg, sib, disp
+    add t1, t1, reg, flags=(OF,SF,ZF,AF,PF,CF)
+    stul t1, seg, sib, disp
+};
+
+def macroop ADD_LOCKED_P_R
+{
+    rdip t7
+    ldstl t1, seg, riprel, disp
+    add t1, t1, reg, flags=(OF,SF,ZF,AF,PF,CF)
+    stul t1, seg, riprel, disp
+};
+
 def macroop ADD_R_M
 {
     ld t1, seg, sib, disp