PPC/s390: Support non-default MicrotaskQueue on RunMicrotasks builtin

Port fab59bbb

Original Commit Message:

    The previous implementation of MicrotaskQueue::RunMicrotasks() didn't
    support non-default MicrotaskQueue as RunMicrotasks builtin couldn't
    take a parameter.

    This CL updates the entry trampoline for RunMicrotasks builtin to pass
    a MicrotaskQueue parameter to support non-default one.

R=tzik@chromium.org, joransiu@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=
LOG=N

Change-Id: Id30e746879b1a17921320eac6c6f6c30e56961cc
Reviewed-on: https://chromium-review.googlesource.com/c/1417385Reviewed-by: Joran Siu <joransiu@ca.ibm.com>
Commit-Queue: Junliang Yan <jyan@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#58894}

src/builtins/ppc/builtins-ppc.cc

@@ -543,12 +543,16 @@ namespace {
 //       Address root_register_value, MicrotaskQueue* microtask_queue)>;
 void Generate_JSEntryVariant(MacroAssembler* masm, StackFrame::Type type,
                              Builtins::Name entry_trampoline) {
+  // The register state is either:
   //   r3: root_register_value
   //   r4: code entry
   //   r5: function
   //   r6: receiver
   //   r7: argc
   //   r8: argv
+  // or
+  //   r3: root_register_value
+  //   r4: microtask_queue
 
   Label invoke, handler_entry, exit;
 
@@ -659,13 +663,6 @@ void Generate_JSEntryVariant(MacroAssembler* masm, StackFrame::Type type,
   // Notice that we cannot store a reference to the trampoline code directly in
   // this stub, because runtime stubs are not traversed when doing GC.
 
-  // Expected registers by Builtins::JSEntryTrampoline
-  // r4: code entry
-  // r5: function
-  // r6: receiver
-  // r7: argc
-  // r8: argv
-  //
   // Invoke the function by calling through JS entry trampoline builtin and
   // pop the faked function when we return.
   Handle<Code> trampoline_code =
@@ -843,7 +840,11 @@ void Builtins::Generate_JSConstructEntryTrampoline(MacroAssembler* masm) {
 }
 
 void Builtins::Generate_RunMicrotasksTrampoline(MacroAssembler* masm) {
+  // This expects two C++ function parameters passed by Invoke() in
+  // execution.cc.
+  //   r3: root_register_value
   //   r4: microtask_queue
+
   __ mr(RunMicrotasksDescriptor::MicrotaskQueueRegister(), r4);
   __ Jump(BUILTIN_CODE(masm->isolate(), RunMicrotasks), RelocInfo::CODE_TARGET);
 }

src/builtins/s390/builtins-s390.cc

@@ -548,12 +548,16 @@ constexpr int kPushedStackSpace =
 //       Address root_register_value, MicrotaskQueue* microtask_queue)>;
 void Generate_JSEntryVariant(MacroAssembler* masm, StackFrame::Type type,
                              Builtins::Name entry_trampoline) {
+  // The register state is either:
   //   r2:                             root register value
   //   r3:                             code entry
   //   r4:                             function
   //   r5:                             receiver
   //   r6:                             argc
   //   [sp + 20 * kSystemPointerSize]: argv
+  // or
+  //   r2: root_register_value
+  //   r3: microtask_queue
 
   Label invoke, handler_entry, exit;
 
@@ -679,13 +683,6 @@ void Generate_JSEntryVariant(MacroAssembler* masm, StackFrame::Type type,
   // Notice that we cannot store a reference to the trampoline code directly in
   // this stub, because runtime stubs are not traversed when doing GC.
 
-  // Expected registers by Builtins::JSEntryTrampoline
-  // r2: code entry
-  // r3: function
-  // r4: receiver
-  // r5: argc
-  // r6: argv
-  //
   // Invoke the function by calling through JS entry trampoline builtin and
   // pop the faked function when we return.
   Handle<Code> trampoline_code =
@@ -893,8 +890,12 @@ void Builtins::Generate_JSConstructEntryTrampoline(MacroAssembler* masm) {
 }
 
 void Builtins::Generate_RunMicrotasksTrampoline(MacroAssembler* masm) {
+  // This expects two C++ function parameters passed by Invoke() in
+  // execution.cc.
+  //   r2: root_register_value
   //   r3: microtask_queue
-  __ mov(RunMicrotasksDescriptor::MicrotaskQueueRegister(), Operand(r3));
+
+  __ LoadRR(RunMicrotasksDescriptor::MicrotaskQueueRegister(), r3);
   __ Jump(BUILTIN_CODE(masm->isolate(), RunMicrotasks), RelocInfo::CODE_TARGET);
 }