s390x:[liftoff] implement AtomicStore

Change-Id: I9ca5ffe40f6d548b032609d98a6bf6df23f31e0a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2805933Reviewed-by: Milad Fa <mfarazma@redhat.com>
Commit-Queue: Junliang Yan <junyan@redhat.com>
Cr-Commit-Position: refs/heads/master@{#73814}

src/wasm/baseline/s390/liftoff-assembler-s390.h

@@ -424,7 +424,56 @@ void LiftoffAssembler::AtomicLoad(LiftoffRegister dst, Register src_addr,
 void LiftoffAssembler::AtomicStore(Register dst_addr, Register offset_reg,
                                    uintptr_t offset_imm, LiftoffRegister src,
                                    StoreType type, LiftoffRegList pinned) {
-  bailout(kAtomics, "AtomicStore");
+  lay(ip,
+      MemOperand(dst_addr, offset_reg == no_reg ? r0 : offset_reg, offset_imm));
+
+  switch (type.value()) {
+    case StoreType::kI32Store8:
+    case StoreType::kI64Store8: {
+      AtomicExchangeU8(ip, src.gp(), r1, r0);
+      break;
+    }
+    case StoreType::kI32Store16:
+    case StoreType::kI64Store16: {
+#ifdef V8_TARGET_BIG_ENDIAN
+      lrvr(r1, src.gp());
+      ShiftRightU32(r1, r1, Operand(16));
+#else
+      LoadU16(r1, src.gp());
+#endif
+      Push(r2);
+      AtomicExchangeU16(ip, r1, r2, r0);
+      Pop(r2);
+      break;
+    }
+    case StoreType::kI32Store:
+    case StoreType::kI64Store32: {
+#ifdef V8_TARGET_BIG_ENDIAN
+      lrvr(r1, src.gp());
+#else
+      LoadU32(r1, src.gp());
+#endif
+      Label do_cs;
+      bind(&do_cs);
+      cs(r0, r1, MemOperand(ip));
+      bne(&do_cs, Label::kNear);
+      break;
+    }
+    case StoreType::kI64Store: {
+#ifdef V8_TARGET_BIG_ENDIAN
+      lrvgr(r1, src.gp());
+#else
+      mov(r1, src.gp());
+#endif
+      Label do_cs;
+      bind(&do_cs);
+      csg(r0, r1, MemOperand(ip));
+      bne(&do_cs, Label::kNear);
+      break;
+    }
+    default:
+      UNREACHABLE();
+  }
 }
 
 void LiftoffAssembler::AtomicAdd(Register dst_addr, Register offset_reg,