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 557811eb7..10c06efb6 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
@@ -327,6 +327,23 @@ def macroop SBB_P_I
     st t1, seg, riprel, disp
 };
 
+def macroop SBB_LOCKED_M_I
+{
+    limm t2, imm
+    ldstl t1, seg, sib, disp
+    sbb t1, t1, t2, flags=(OF,SF,ZF,AF,PF,CF)
+    stul t1, seg, sib, disp
+};
+
+def macroop SBB_LOCKED_P_I
+{
+    rdip t7
+    limm t2, imm
+    ldstl t1, seg, riprel, disp
+    sbb t1, t1, t2, flags=(OF,SF,ZF,AF,PF,CF)
+    stul t1, seg, riprel, disp
+};
+
 def macroop SBB_M_R
 {
     ldst t1, seg, sib, disp
@@ -342,6 +359,21 @@ def macroop SBB_P_R
     st t1, seg, riprel, disp
 };
 
+def macroop SBB_LOCKED_M_R
+{
+    ldstl t1, seg, sib, disp
+    sbb t1, t1, reg, flags=(OF,SF,ZF,AF,PF,CF)
+    stul t1, seg, sib, disp
+};
+
+def macroop SBB_LOCKED_P_R
+{
+    rdip t7
+    ldstl t1, seg, riprel, disp
+    sbb t1, t1, reg, flags=(OF,SF,ZF,AF,PF,CF)
+    stul t1, seg, riprel, disp
+};
+
 def macroop NEG_R
 {
     sub reg, t0, reg, flags=(CF,OF,SF,ZF,AF,PF)