PPC/s390: Implement ComputeCodeStartAddress in TurboAssembler

R=joransiu@ca.ibm.com

Change-Id: Ie7387c92f9994cd72d6f0ba660ba7bd275dd429a
Reviewed-on: https://chromium-review.googlesource.com/1001496Reviewed-by: Joran Siu <joransiu@ca.ibm.com>
Commit-Queue: Junliang Yan <jyan@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#52496}

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

@@ -794,12 +794,7 @@ void CodeGenerator::AssembleTailCallAfterGap(Instruction* instr,
 // Check that {kJavaScriptCallCodeStartRegister} is correct.
 void CodeGenerator::AssembleCodeStartRegisterCheck() {
   Register scratch = kScratchReg;
-
-  Label current_pc;
-  __ mov_label_addr(scratch, &current_pc);
-
-  __ bind(&current_pc);
-  __ subi(scratch, scratch, Operand(__ pc_offset()));
+  __ ComputeCodeStartAddress(scratch);
   __ cmp(scratch, kJavaScriptCallCodeStartRegister);
   __ Assert(eq, AbortReason::kWrongFunctionCodeStart);
 }
@@ -814,11 +809,7 @@ void CodeGenerator::AssembleCodeStartRegisterCheck() {
 void CodeGenerator::BailoutIfDeoptimized() {
   if (FLAG_debug_code) {
     // Check that {kJavaScriptCallCodeStartRegister} is correct.
-    Label current_pc;
-    __ mov_label_addr(ip, &current_pc);
-
-    __ bind(&current_pc);
-    __ subi(ip, ip, Operand(__ pc_offset()));
+    __ ComputeCodeStartAddress(ip);
     __ cmp(ip, kJavaScriptCallCodeStartRegister);
     __ Assert(eq, AbortReason::kWrongFunctionCodeStart);
   }

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

@@ -1041,8 +1041,7 @@ void CodeGenerator::AssembleTailCallAfterGap(Instruction* instr,
 // Check that {kJavaScriptCallCodeStartRegister} is correct.
 void CodeGenerator::AssembleCodeStartRegisterCheck() {
   Register scratch = r1;
-  int pc_offset = __ pc_offset();
-  __ larl(scratch, Operand(-pc_offset/2));
+  __ ComputeCodeStartAddress(scratch);
   __ CmpP(scratch, kJavaScriptCallCodeStartRegister);
   __ Assert(eq, AbortReason::kWrongFunctionCodeStart);
 }
@@ -1057,8 +1056,7 @@ void CodeGenerator::AssembleCodeStartRegisterCheck() {
 void CodeGenerator::BailoutIfDeoptimized() {
   if (FLAG_debug_code) {
     // Check that {kJavaScriptCallCodeStartRegister} is correct.
-    int pc_offset = __ pc_offset();
-    __ larl(ip, Operand(-pc_offset/2));
+    __ ComputeCodeStartAddress(ip);
     __ CmpP(ip, kJavaScriptCallCodeStartRegister);
     __ Assert(eq, AbortReason::kWrongFunctionCodeStart);
   }

src/ppc/macro-assembler-ppc.cc

@@ -838,6 +838,14 @@ void TurboAssembler::LoadPC(Register dst) {
   mflr(dst);
 }
 
+void TurboAssembler::ComputeCodeStartAddress(Register dst) {
+  Label current_pc;
+  mov_label_addr(dst, &current_pc);
+
+  bind(&current_pc);
+  subi(dst, dst, Operand(pc_offset()));
+}
+
 void TurboAssembler::LoadConstantPoolPointerRegister() {
   LoadPC(kConstantPoolRegister);
   int32_t delta = -pc_offset() + 4;

src/ppc/macro-assembler-ppc.h

@@ -217,6 +217,7 @@ class TurboAssembler : public Assembler {
   void LoadSingleU(DoubleRegister dst, const MemOperand& mem,
                    Register scratch = no_reg);
   void LoadPC(Register dst);
+  void ComputeCodeStartAddress(Register dst);
 
   void StoreDouble(DoubleRegister src, const MemOperand& mem,
                    Register scratch = no_reg);

src/s390/macro-assembler-s390.cc

@@ -4293,6 +4293,10 @@ void TurboAssembler::ResetSpeculationPoisonRegister() {
   mov(kSpeculationPoisonRegister, Operand(-1));
 }
 
+void TurboAssembler::ComputeCodeStartAddress(Register dst) {
+  larl(dst, Operand(-pc_offset() / 2));
+}
+
 }  // namespace internal
 }  // namespace v8
 

src/s390/macro-assembler-s390.h

@@ -1011,6 +1011,7 @@ class TurboAssembler : public Assembler {
                      Label* condition_met);
 
   void ResetSpeculationPoisonRegister();
+  void ComputeCodeStartAddress(Register dst);
 
  private:
   static const int kSmiShift = kSmiTagSize + kSmiShiftSize;