PPC: [wasm] Fixes for embedded constant pools.

src/ppc/macro-assembler-ppc.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <assert.h>  // For assert
 #include <limits.h>  // For LONG_MIN, LONG_MAX.
 
 #if V8_TARGET_ARCH_PPC
 
 #include "src/base/bits.h"
@@ skipping 735 matching lines @@
   add_label_offset(kConstantPoolRegister, base, ConstantPoolPosition(),
                    code_start_delta);
 }
 
 
 void MacroAssembler::LoadConstantPoolPointerRegister() {
   mov_label_addr(kConstantPoolRegister, ConstantPoolPosition());
 }
 
 
-void MacroAssembler::StubPrologue(int prologue_offset) {
+void MacroAssembler::StubPrologue(Register base, int prologue_offset) {
   LoadSmiLiteral(r11, Smi::FromInt(StackFrame::STUB));
   PushFixedFrame(r11);
   // Adjust FP to point to saved FP.
   addi(fp, sp, Operand(StandardFrameConstants::kFixedFrameSizeFromFp));
   if (FLAG_enable_embedded_constant_pool) {
-    // ip contains prologue address
-    LoadConstantPoolPointerRegister(ip, -prologue_offset);
+    if (!base.is(no_reg)) {
+      // base contains prologue address
+      LoadConstantPoolPointerRegister(base, -prologue_offset);
+    } else {
+      LoadConstantPoolPointerRegister();
+    }
     set_constant_pool_available(true);
   }
 }
 
 
-void MacroAssembler::Prologue(bool code_pre_aging, int prologue_offset) {
+void MacroAssembler::Prologue(bool code_pre_aging, Register base,
+                              int prologue_offset) {
+  DCHECK(base.is(ip));
   {
     PredictableCodeSizeScope predictible_code_size_scope(
         this, kNoCodeAgeSequenceLength);
     Assembler::BlockTrampolinePoolScope block_trampoline_pool(this);
     // The following instructions must remain together and unmodified
     // for code aging to work properly.
     if (code_pre_aging) {
       // Pre-age the code.
       // This matches the code found in PatchPlatformCodeAge()
       Code* stub = Code::GetPreAgedCodeAgeStub(isolate());
       intptr_t target = reinterpret_cast<intptr_t>(stub->instruction_start());
       // Don't use Call -- we need to preserve ip and lr
       nop();  // marker to detect sequence (see IsOld)
       mov(r3, Operand(target));
       Jump(r3);
       for (int i = 0; i < kCodeAgingSequenceNops; i++) {
         nop();
       }
     } else {
       // This matches the code found in GetNoCodeAgeSequence()
       PushFixedFrame(r4);
       // Adjust fp to point to saved fp.
       addi(fp, sp, Operand(StandardFrameConstants::kFixedFrameSizeFromFp));
       for (int i = 0; i < kNoCodeAgeSequenceNops; i++) {
         nop();
       }
     }
   }
   if (FLAG_enable_embedded_constant_pool) {
-    // ip contains prologue address
-    LoadConstantPoolPointerRegister(ip, -prologue_offset);
+    // base contains prologue address
+    LoadConstantPoolPointerRegister(base, -prologue_offset);
     set_constant_pool_available(true);
   }
 }
 
 
 void MacroAssembler::EmitLoadTypeFeedbackVector(Register vector) {
   LoadP(vector, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
   LoadP(vector, FieldMemOperand(vector, JSFunction::kSharedFunctionInfoOffset));
   LoadP(vector,
         FieldMemOperand(vector, SharedFunctionInfo::kFeedbackVectorOffset));
@@ skipping 3487 matching lines @@
   }
   if (mag.shift > 0) srawi(result, result, mag.shift);
   ExtractBit(r0, dividend, 31);
   add(result, result, r0);
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_PPC