diff --git a/src/compiler/backend/ppc/code-generator-ppc.cc b/src/compiler/backend/ppc/code-generator-ppc.cc
index b861c3d026..fd954d94c8 100644
--- a/src/compiler/backend/ppc/code-generator-ppc.cc
+++ b/src/compiler/backend/ppc/code-generator-ppc.cc
@@ -180,7 +180,9 @@ class OutOfLineRecordWrite final : public OutOfLineCode {
       __ mflr(scratch0_);
       __ Push(scratch0_);
     }
-    if (stub_mode_ == StubCallMode::kCallWasmRuntimeStub) {
+    if (mode_ == RecordWriteMode::kValueIsEphemeronKey) {
+      __ CallEphemeronKeyBarrier(object_, scratch1_, save_fp_mode);
+    } else if (stub_mode_ == StubCallMode::kCallWasmRuntimeStub) {
       __ CallRecordWriteStub(object_, scratch1_, remembered_set_action,
                              save_fp_mode, wasm::WasmCode::kWasmRecordWrite);
     } else {
diff --git a/src/compiler/backend/s390/code-generator-s390.cc b/src/compiler/backend/s390/code-generator-s390.cc
index cbca355ca8..bd72664acc 100644
--- a/src/compiler/backend/s390/code-generator-s390.cc
+++ b/src/compiler/backend/s390/code-generator-s390.cc
@@ -217,7 +217,9 @@ class OutOfLineRecordWrite final : public OutOfLineCode {
       // We need to save and restore r14 if the frame was elided.
       __ Push(r14);
     }
-    if (stub_mode_ == StubCallMode::kCallWasmRuntimeStub) {
+    if (mode_ == RecordWriteMode::kValueIsEphemeronKey) {
+      __ CallEphemeronKeyBarrier(object_, scratch1_, save_fp_mode);
+    } else if (stub_mode_ == StubCallMode::kCallWasmRuntimeStub) {
       __ CallRecordWriteStub(object_, scratch1_, remembered_set_action,
                              save_fp_mode, wasm::WasmCode::kWasmRecordWrite);
     } else {
diff --git a/src/ppc/interface-descriptors-ppc.cc b/src/ppc/interface-descriptors-ppc.cc
index 20e395834c..a9f9635bd5 100644
--- a/src/ppc/interface-descriptors-ppc.cc
+++ b/src/ppc/interface-descriptors-ppc.cc
@@ -34,6 +34,18 @@ void RecordWriteDescriptor::InitializePlatformSpecific(
   data->InitializePlatformSpecific(kParameterCount, default_stub_registers);
 }
 
+void EphemeronKeyBarrierDescriptor::InitializePlatformSpecific(
+    CallInterfaceDescriptorData* data) {
+  const Register default_stub_registers[] = {r3, r4, r5, r6, r7};
+
+  data->RestrictAllocatableRegisters(default_stub_registers,
+                                     arraysize(default_stub_registers));
+
+  CHECK_LE(static_cast<size_t>(kParameterCount),
+           arraysize(default_stub_registers));
+  data->InitializePlatformSpecific(kParameterCount, default_stub_registers);
+}
+
 const Register FastNewFunctionContextDescriptor::ScopeInfoRegister() {
   return r4;
 }
diff --git a/src/ppc/macro-assembler-ppc.cc b/src/ppc/macro-assembler-ppc.cc
index 9462ee4aa1..708cb30c60 100644
--- a/src/ppc/macro-assembler-ppc.cc
+++ b/src/ppc/macro-assembler-ppc.cc
@@ -459,6 +459,32 @@ void TurboAssembler::RestoreRegisters(RegList registers) {
   MultiPop(regs);
 }
 
+void TurboAssembler::CallEphemeronKeyBarrier(Register object, Register address,
+                                             SaveFPRegsMode fp_mode) {
+  EphemeronKeyBarrierDescriptor descriptor;
+  RegList registers = descriptor.allocatable_registers();
+
+  SaveRegisters(registers);
+
+  Register object_parameter(
+      descriptor.GetRegisterParameter(EphemeronKeyBarrierDescriptor::kObject));
+  Register slot_parameter(descriptor.GetRegisterParameter(
+      EphemeronKeyBarrierDescriptor::kSlotAddress));
+  Register fp_mode_parameter(
+      descriptor.GetRegisterParameter(EphemeronKeyBarrierDescriptor::kFPMode));
+
+  push(object);
+  push(address);
+
+  pop(slot_parameter);
+  pop(object_parameter);
+
+  Move(fp_mode_parameter, Smi::FromEnum(fp_mode));
+  Call(isolate()->builtins()->builtin_handle(Builtins::kEphemeronKeyBarrier),
+       RelocInfo::CODE_TARGET);
+  RestoreRegisters(registers);
+}
+
 void TurboAssembler::CallRecordWriteStub(
     Register object, Register address,
     RememberedSetAction remembered_set_action, SaveFPRegsMode fp_mode) {
diff --git a/src/ppc/macro-assembler-ppc.h b/src/ppc/macro-assembler-ppc.h
index f67666ce33..c010e6a2bd 100644
--- a/src/ppc/macro-assembler-ppc.h
+++ b/src/ppc/macro-assembler-ppc.h
@@ -272,6 +272,8 @@ class V8_EXPORT_PRIVATE TurboAssembler : public TurboAssemblerBase {
   void CallRecordWriteStub(Register object, Register address,
                            RememberedSetAction remembered_set_action,
                            SaveFPRegsMode fp_mode, Address wasm_target);
+  void CallEphemeronKeyBarrier(Register object, Register address,
+                               SaveFPRegsMode fp_mode);
 
   void MultiPush(RegList regs, Register location = sp);
   void MultiPop(RegList regs, Register location = sp);
diff --git a/src/s390/interface-descriptors-s390.cc b/src/s390/interface-descriptors-s390.cc
index da51d195ff..70033be214 100644
--- a/src/s390/interface-descriptors-s390.cc
+++ b/src/s390/interface-descriptors-s390.cc
@@ -34,6 +34,18 @@ void RecordWriteDescriptor::InitializePlatformSpecific(
   data->InitializePlatformSpecific(kParameterCount, default_stub_registers);
 }
 
+void EphemeronKeyBarrierDescriptor::InitializePlatformSpecific(
+    CallInterfaceDescriptorData* data) {
+  const Register default_stub_registers[] = {r2, r3, r4, r5, r6};
+
+  data->RestrictAllocatableRegisters(default_stub_registers,
+                                     arraysize(default_stub_registers));
+
+  CHECK_LE(static_cast<size_t>(kParameterCount),
+           arraysize(default_stub_registers));
+  data->InitializePlatformSpecific(kParameterCount, default_stub_registers);
+}
+
 const Register FastNewFunctionContextDescriptor::ScopeInfoRegister() {
   return r3;
 }
diff --git a/src/s390/macro-assembler-s390.cc b/src/s390/macro-assembler-s390.cc
index e2ac0fa973..03ebdb0c7b 100644
--- a/src/s390/macro-assembler-s390.cc
+++ b/src/s390/macro-assembler-s390.cc
@@ -478,6 +478,32 @@ void TurboAssembler::RestoreRegisters(RegList registers) {
   MultiPop(regs);
 }
 
+void TurboAssembler::CallEphemeronKeyBarrier(Register object, Register address,
+                                             SaveFPRegsMode fp_mode) {
+  EphemeronKeyBarrierDescriptor descriptor;
+  RegList registers = descriptor.allocatable_registers();
+
+  SaveRegisters(registers);
+
+  Register object_parameter(
+      descriptor.GetRegisterParameter(EphemeronKeyBarrierDescriptor::kObject));
+  Register slot_parameter(descriptor.GetRegisterParameter(
+      EphemeronKeyBarrierDescriptor::kSlotAddress));
+  Register fp_mode_parameter(
+      descriptor.GetRegisterParameter(EphemeronKeyBarrierDescriptor::kFPMode));
+
+  Push(object);
+  Push(address);
+
+  Pop(slot_parameter);
+  Pop(object_parameter);
+
+  Move(fp_mode_parameter, Smi::FromEnum(fp_mode));
+  Call(isolate()->builtins()->builtin_handle(Builtins::kEphemeronKeyBarrier),
+       RelocInfo::CODE_TARGET);
+  RestoreRegisters(registers);
+}
+
 void TurboAssembler::CallRecordWriteStub(
     Register object, Register address,
     RememberedSetAction remembered_set_action, SaveFPRegsMode fp_mode) {
diff --git a/src/s390/macro-assembler-s390.h b/src/s390/macro-assembler-s390.h
index 90f5e1fc44..be3785c035 100644
--- a/src/s390/macro-assembler-s390.h
+++ b/src/s390/macro-assembler-s390.h
@@ -203,6 +203,8 @@ class V8_EXPORT_PRIVATE TurboAssembler : public TurboAssemblerBase {
   void CallRecordWriteStub(Register object, Register address,
                            RememberedSetAction remembered_set_action,
                            SaveFPRegsMode fp_mode, Address wasm_target);
+  void CallEphemeronKeyBarrier(Register object, Register address,
+                               SaveFPRegsMode fp_mode);
 
   void MultiPush(RegList regs, Register location = sp);
   void MultiPop(RegList regs, Register location = sp);