From cefa0fd937cb48a8431e62268b2c9500b104d4e5 Mon Sep 17 00:00:00 2001
From: Junliang Yan <jyan@ca.ibm.com>
Date: Wed, 9 May 2018 18:39:49 -0400
Subject: [PATCH 3/4] [PATCH] PPC: use pc-relative address to init constpool
 reg

R=joransiu@ca.ibm.com

Change-Id: I67364f29d494b09786a14b13743f73bef4b64582
Reviewed-on: https://chromium-review.googlesource.com/950242
Commit-Queue: Junliang Yan <jyan@ca.ibm.com>
Reviewed-by: Joran Siu <joransiu@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#51750}

Signed-off-by: Stephen Gallagher <sgallagh@redhat.com>
---
 deps/v8/src/ppc/macro-assembler-ppc.cc | 14 ++++++++++----
 deps/v8/src/ppc/macro-assembler-ppc.h  |  9 +++++----
 2 files changed, 15 insertions(+), 8 deletions(-)

diff --git a/deps/v8/src/ppc/macro-assembler-ppc.cc b/deps/v8/src/ppc/macro-assembler-ppc.cc
index 68efa84c72c7f6d781d508183b53ea83024944d1..3192e9cefb1c1b116c5e12b5c52e7971b92a111a 100644
--- a/deps/v8/src/ppc/macro-assembler-ppc.cc
+++ b/deps/v8/src/ppc/macro-assembler-ppc.cc
@@ -166,11 +166,11 @@ void TurboAssembler::Call(Register target) {
 
   DCHECK_EQ(CallSize(target), SizeOfCodeGeneratedSince(&start));
 }
 
 void MacroAssembler::CallJSEntry(Register target) {
-  DCHECK(target == ip);
+  CHECK(target == r5);
   Call(target);
 }
 
 int TurboAssembler::CallSize(Address target, RelocInfo::Mode rmode,
                              Condition cond) {
@@ -823,20 +823,27 @@ void TurboAssembler::ShiftRightAlgPair(Register dst_low, Register dst_high,
     srawi(dst_high, src_high, shift);
   }
 }
 #endif
 
-void MacroAssembler::LoadConstantPoolPointerRegisterFromCodeTargetAddress(
+void TurboAssembler::LoadConstantPoolPointerRegisterFromCodeTargetAddress(
     Register code_target_address) {
   lwz(kConstantPoolRegister,
       MemOperand(code_target_address,
                  Code::kConstantPoolOffset - Code::kHeaderSize));
   add(kConstantPoolRegister, kConstantPoolRegister, code_target_address);
 }
 
+void TurboAssembler::LoadPC(Register dst) {
+  b(4, SetLK);
+  mflr(dst);
+}
+
 void TurboAssembler::LoadConstantPoolPointerRegister() {
-  mov_label_addr(kConstantPoolRegister, ConstantPoolPosition());
+  LoadPC(kConstantPoolRegister);
+  add_label_offset(kConstantPoolRegister, kConstantPoolRegister,
+                   ConstantPoolPosition(), -pc_offset() + 4);
 }
 
 void TurboAssembler::StubPrologue(StackFrame::Type type) {
   {
     ConstantPoolUnavailableScope constant_pool_unavailable(this);
@@ -848,11 +855,10 @@ void TurboAssembler::StubPrologue(StackFrame::Type type) {
     set_constant_pool_available(true);
   }
 }
 
 void TurboAssembler::Prologue() {
-  DCHECK(base != no_reg);
   PushStandardFrame(r4);
   if (FLAG_enable_embedded_constant_pool) {
     // base contains prologue address
     LoadConstantPoolPointerRegister();
     set_constant_pool_available(true);
diff --git a/deps/v8/src/ppc/macro-assembler-ppc.h b/deps/v8/src/ppc/macro-assembler-ppc.h
index f4d9afd47f150f9cd2e840c20a61e965a5d8f5f5..32e6219c41bbbfe8427e05f2f9a02ff800efcffb 100644
--- a/deps/v8/src/ppc/macro-assembler-ppc.h
+++ b/deps/v8/src/ppc/macro-assembler-ppc.h
@@ -214,10 +214,11 @@ class TurboAssembler : public Assembler {
 
   void LoadSingle(DoubleRegister dst, const MemOperand& mem,
                   Register scratch = no_reg);
   void LoadSingleU(DoubleRegister dst, const MemOperand& mem,
                    Register scratch = no_reg);
+  void LoadPC(Register dst);
 
   void StoreDouble(DoubleRegister src, const MemOperand& mem,
                    Register scratch = no_reg);
   void StoreDoubleU(DoubleRegister src, const MemOperand& mem,
                     Register scratch = no_reg);
@@ -639,10 +640,14 @@ class TurboAssembler : public Assembler {
 
   // Call a code stub.
   void CallStubDelayed(CodeStub* stub);
 
   void LoadConstantPoolPointerRegister();
+
+  // Loads the constant pool pointer (kConstantPoolRegister).
+  void LoadConstantPoolPointerRegisterFromCodeTargetAddress(
+      Register code_target_address);
   void AbortConstantPoolBuilding() {
 #ifdef DEBUG
     // Avoid DCHECK(!is_linked()) failure in ~Label()
     bind(ConstantPoolPosition());
 #endif
@@ -733,14 +738,10 @@ class MacroAssembler : public TurboAssembler {
   // Push and pop the registers that can hold pointers, as defined by the
   // RegList constant kSafepointSavedRegisters.
   void PushSafepointRegisters();
   void PopSafepointRegisters();
 
-  // Loads the constant pool pointer (kConstantPoolRegister).
-  void LoadConstantPoolPointerRegisterFromCodeTargetAddress(
-      Register code_target_address);
-
   // Flush the I-cache from asm code. You should use CpuFeatures::FlushICache
   // from C.
   // Does not handle errors.
   void FlushICache(Register address, size_t size, Register scratch);
 
-- 
2.17.0