PPC/s390: [wasm-c-api] Faster C-to-Wasm entry

Port e304d80e

Original Commit Message:

    powered by a new function Execution::CallWasm and a corresponding,
    Turbofan-generated CWasmEntry stub. This entirely sidesteps the
    traditional Execution::Invoke -> JSEntryStub path.

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

Change-Id: I87c85f3506c4e4dae12e462dd3c7790bc9ab25d1
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1680798Reviewed-by: Junliang Yan <jyan@ca.ibm.com>
Commit-Queue: Milad Farazmand <miladfar@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#62429}

src/compiler/backend/ppc/code-generator-ppc.cc

@@ -2326,14 +2326,20 @@ void CodeGenerator::AssembleConstructFrame() {
   auto call_descriptor = linkage()->GetIncomingDescriptor();
   if (frame_access_state()->has_frame()) {
     if (call_descriptor->IsCFunctionCall()) {
-      __ mflr(r0);
-      if (FLAG_enable_embedded_constant_pool) {
-        __ Push(r0, fp, kConstantPoolRegister);
-        // Adjust FP to point to saved FP.
-        __ subi(fp, sp, Operand(StandardFrameConstants::kConstantPoolOffset));
+      if (info()->GetOutputStackFrameType() == StackFrame::C_WASM_ENTRY) {
+        __ StubPrologue(StackFrame::C_WASM_ENTRY);
+        // Reserve stack space for saving the c_entry_fp later.
+        __ addi(sp, sp, Operand(-kSystemPointerSize));
       } else {
-        __ Push(r0, fp);
-        __ mr(fp, sp);
+        __ mflr(r0);
+        if (FLAG_enable_embedded_constant_pool) {
+          __ Push(r0, fp, kConstantPoolRegister);
+          // Adjust FP to point to saved FP.
+          __ subi(fp, sp, Operand(StandardFrameConstants::kConstantPoolOffset));
+        } else {
+          __ Push(r0, fp);
+          __ mr(fp, sp);
+        }
       }
     } else if (call_descriptor->IsJSFunctionCall()) {
       __ Prologue();

src/compiler/backend/s390/code-generator-s390.cc

@@ -3024,8 +3024,14 @@ void CodeGenerator::AssembleConstructFrame() {
 
   if (frame_access_state()->has_frame()) {
     if (call_descriptor->IsCFunctionCall()) {
-      __ Push(r14, fp);
-      __ LoadRR(fp, sp);
+      if (info()->GetOutputStackFrameType() == StackFrame::C_WASM_ENTRY) {
+        __ StubPrologue(StackFrame::C_WASM_ENTRY);
+        // Reserve stack space for saving the c_entry_fp later.
+        __ lay(sp, MemOperand(sp, -kSystemPointerSize));
+      } else {
+        __ Push(r14, fp);
+        __ LoadRR(fp, sp);
+      }
     } else if (call_descriptor->IsJSFunctionCall()) {
       __ Prologue(ip);
       if (call_descriptor->PushArgumentCount()) {