s390: implement atomic exchange on TF

src/s390/disasm-s390.cc

Index: src/s390/disasm-s390.cc
diff --git a/src/s390/disasm-s390.cc b/src/s390/disasm-s390.cc
index d4a1d0d638db8e1df2fecf5e066c1cdd46ceea20..1ef54d5757986dbae140593f37abc8fbd6896f5f 100644
--- a/src/s390/disasm-s390.cc
+++ b/src/s390/disasm-s390.cc
@@ -640,6 +640,9 @@ bool Decoder::DecodeFourByte(Instruction* instr) {
     case LM:
       Format(instr, "lm\t'r1,'r2,'d1('r3)");
       break;
+    case CS:
+      Format(instr, "cs\t'r1,'r2,'d1('r3)");
+      break;
     case SLL:
       Format(instr, "sll\t'r1,'d1('r3)");
       break;
@@ -1208,6 +1211,12 @@ bool Decoder::DecodeSixByte(Instruction* instr) {
     case LMG:
       Format(instr, "lmg\t'r1,'r2,'d2('r3)");
       break;
+    case CSY:
+      Format(instr, "csy\t'r1,'r2,'d2('r3)");
+      break;
+    case CSG:
+      Format(instr, "csg\t'r1,'r2,'d2('r3)");
+      break;
     case STMY:
       Format(instr, "stmy\t'r1,'r2,'d2('r3)");
       break;