S390: Initial impl of S390 asm, masm, code-stubs,...

src/s390/deoptimizer-s390.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 "src/deoptimizer.h"
 #include "src/codegen.h"
-#include "src/deoptimizer.h"
 #include "src/full-codegen/full-codegen.h"
 #include "src/register-configuration.h"
 #include "src/safepoint-table.h"
 
 namespace v8 {
 namespace internal {
 
-const int Deoptimizer::table_entry_size_ = 8;
-
+// LAY + LGHI/LHI + BRCL
+const int Deoptimizer::table_entry_size_ = 16;
 
 int Deoptimizer::patch_size() {
-#if V8_TARGET_ARCH_PPC64
-  const int kCallInstructionSizeInWords = 7;
+#if V8_TARGET_ARCH_S390X
+  const int kCallInstructionSize = 16;
 #else
-  const int kCallInstructionSizeInWords = 4;
+  const int kCallInstructionSize = 10;
 #endif
-  return kCallInstructionSizeInWords * Assembler::kInstrSize;
+  return kCallInstructionSize;
 }
 
-
 void Deoptimizer::EnsureRelocSpaceForLazyDeoptimization(Handle<Code> code) {
   // Empty because there is no need for relocation information for the code
   // patching in Deoptimizer::PatchCodeForDeoptimization below.
 }
 
-
 void Deoptimizer::PatchCodeForDeoptimization(Isolate* isolate, Code* code) {
   Address code_start_address = code->instruction_start();
 
   // Invalidate the relocation information, as it will become invalid by the
   // code patching below, and is not needed any more.
   code->InvalidateRelocation();
 
   if (FLAG_zap_code_space) {
     // Fail hard and early if we enter this code object again.
     byte* pointer = code->FindCodeAgeSequence();
     if (pointer != NULL) {
       pointer += kNoCodeAgeSequenceLength;
     } else {
       pointer = code->instruction_start();
     }
-    CodePatcher patcher(isolate, pointer, 1);
+    CodePatcher patcher(isolate, pointer, 2);
     patcher.masm()->bkpt(0);
 
     DeoptimizationInputData* data =
         DeoptimizationInputData::cast(code->deoptimization_data());
     int osr_offset = data->OsrPcOffset()->value();
     if (osr_offset > 0) {
       CodePatcher osr_patcher(isolate, code->instruction_start() + osr_offset,
-                              1);
+                              2);
       osr_patcher.masm()->bkpt(0);
     }
   }
 
   DeoptimizationInputData* deopt_data =
       DeoptimizationInputData::cast(code->deoptimization_data());
 #ifdef DEBUG
   Address prev_call_address = NULL;
 #endif
   // For each LLazyBailout instruction insert a call to the corresponding
   // deoptimization entry.
   for (int i = 0; i < deopt_data->DeoptCount(); i++) {
     if (deopt_data->Pc(i)->value() == -1) continue;
     Address call_address = code_start_address + deopt_data->Pc(i)->value();
     Address deopt_entry = GetDeoptimizationEntry(isolate, i, LAZY);
     // We need calls to have a predictable size in the unoptimized code, but
     // this is optimized code, so we don't have to have a predictable size.
     int call_size_in_bytes = MacroAssembler::CallSizeNotPredictableCodeSize(
         deopt_entry, kRelocInfo_NONEPTR);
-    int call_size_in_words = call_size_in_bytes / Assembler::kInstrSize;
-    DCHECK(call_size_in_bytes % Assembler::kInstrSize == 0);
     DCHECK(call_size_in_bytes <= patch_size());
-    CodePatcher patcher(isolate, call_address, call_size_in_words);
+    CodePatcher patcher(isolate, call_address, call_size_in_bytes);
     patcher.masm()->Call(deopt_entry, kRelocInfo_NONEPTR);
     DCHECK(prev_call_address == NULL ||
            call_address >= prev_call_address + patch_size());
     DCHECK(call_address + patch_size() <= code->instruction_end());
 #ifdef DEBUG
     prev_call_address = call_address;
 #endif
   }
 }
 
-
 void Deoptimizer::SetPlatformCompiledStubRegisters(
     FrameDescription* output_frame, CodeStubDescriptor* descriptor) {
   ApiFunction function(descriptor->deoptimization_handler());
   ExternalReference xref(&function, ExternalReference::BUILTIN_CALL, isolate_);
   intptr_t handler = reinterpret_cast<intptr_t>(xref.address());
   int params = descriptor->GetHandlerParameterCount();
-  output_frame->SetRegister(r3.code(), params);
-  output_frame->SetRegister(r4.code(), handler);
+  output_frame->SetRegister(r2.code(), params);
+  output_frame->SetRegister(r3.code(), handler);
 }
 
-
 void Deoptimizer::CopyDoubleRegisters(FrameDescription* output_frame) {
   for (int i = 0; i < DoubleRegister::kNumRegisters; ++i) {
     double double_value = input_->GetDoubleRegister(i);
     output_frame->SetDoubleRegister(i, double_value);
   }
 }
 
 bool Deoptimizer::HasAlignmentPadding(SharedFunctionInfo* shared) {
-  // There is no dynamic alignment padding on PPC in the input frame.
+  // There is no dynamic alignment padding on S390 in the input frame.
   return false;
 }
 
-
 #define __ masm()->
 
 // This code tries to be close to ia32 code so that any changes can be
 // easily ported.
 void Deoptimizer::TableEntryGenerator::Generate() {
   GeneratePrologue();
 
-  // Unlike on ARM we don't save all the registers, just the useful ones.
-  // For the rest, there are gaps on the stack, so the offsets remain the same.
+  // Save all the registers onto the stack
   const int kNumberOfRegisters = Register::kNumRegisters;
 
   RegList restored_regs = kJSCallerSaved | kCalleeSaved;
-  RegList saved_regs = restored_regs | sp.bit();
 
   const int kDoubleRegsSize = kDoubleSize * DoubleRegister::kNumRegisters;
 
   // Save all double registers before messing with them.
-  __ subi(sp, sp, Operand(kDoubleRegsSize));
+  __ lay(sp, MemOperand(sp, -kDoubleRegsSize));
   const RegisterConfiguration* config =
       RegisterConfiguration::ArchDefault(RegisterConfiguration::CRANKSHAFT);
   for (int i = 0; i < config->num_allocatable_double_registers(); ++i) {
     int code = config->GetAllocatableDoubleCode(i);
     const DoubleRegister dreg = DoubleRegister::from_code(code);
     int offset = code * kDoubleSize;
-    __ stfd(dreg, MemOperand(sp, offset));
+    __ StoreDouble(dreg, MemOperand(sp, offset));
   }
 
-  // Push saved_regs (needed to populate FrameDescription::registers_).
-  // Leave gaps for other registers.
-  __ subi(sp, sp, Operand(kNumberOfRegisters * kPointerSize));
-  for (int16_t i = kNumberOfRegisters - 1; i >= 0; i--) {
-    if ((saved_regs & (1 << i)) != 0) {
-      __ StoreP(ToRegister(i), MemOperand(sp, kPointerSize * i));
-    }
-  }
+  // Push all GPRs onto the stack
+  __ lay(sp, MemOperand(sp, -kNumberOfRegisters * kPointerSize));
+  __ StoreMultipleP(r0, sp, MemOperand(sp));  // Save all 16 registers
 
   __ mov(ip, Operand(ExternalReference(Isolate::kCEntryFPAddress, isolate())));
   __ StoreP(fp, MemOperand(ip));
 
   const int kSavedRegistersAreaSize =
       (kNumberOfRegisters * kPointerSize) + kDoubleRegsSize;
 
   // Get the bailout id from the stack.
-  __ LoadP(r5, MemOperand(sp, kSavedRegistersAreaSize));
+  __ LoadP(r4, MemOperand(sp, kSavedRegistersAreaSize));
 
-  // Get the address of the location in the code object (r6) (return
+  // Cleanse the Return address for 31-bit
+  __ CleanseP(r14);
+
+  // Get the address of the location in the code object (r5)(return
   // address for lazy deoptimization) and compute the fp-to-sp delta in
-  // register r7.
-  __ mflr(r6);
-  // Correct one word for bailout id.
-  __ addi(r7, sp, Operand(kSavedRegistersAreaSize + (1 * kPointerSize)));
-  __ sub(r7, fp, r7);
+  // register r6.
+  __ LoadRR(r5, r14);
+  __ la(r6, MemOperand(sp, kSavedRegistersAreaSize + (1 * kPointerSize)));
+  __ SubP(r6, fp, r6);
 
   // Allocate a new deoptimizer object.
-  // Pass six arguments in r3 to r8.
-  __ PrepareCallCFunction(6, r8);
-  __ LoadP(r3, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
-  __ li(r4, Operand(type()));  // bailout type,
-  // r5: bailout id already loaded.
-  // r6: code address or 0 already loaded.
-  // r7: Fp-to-sp delta.
-  __ mov(r8, Operand(ExternalReference::isolate_address(isolate())));
+  // Pass six arguments in r2 to r7.
+  __ PrepareCallCFunction(6, r7);
+  __ LoadP(r2, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
+  __ LoadImmP(r3, Operand(type()));  // bailout type,
+  // r4: bailout id already loaded.
+  // r5: code address or 0 already loaded.
+  // r6: Fp-to-sp delta.
+  // Parm6: isolate is passed on the stack.
+  __ mov(r7, Operand(ExternalReference::isolate_address(isolate())));
+  __ StoreP(r7, MemOperand(sp, kStackFrameExtraParamSlot * kPointerSize));
+
   // Call Deoptimizer::New().
   {
     AllowExternalCallThatCantCauseGC scope(masm());
     __ CallCFunction(ExternalReference::new_deoptimizer_function(isolate()), 6);
   }
 
-  // Preserve "deoptimizer" object in register r3 and get the input
-  // frame descriptor pointer to r4 (deoptimizer->input_);
-  __ LoadP(r4, MemOperand(r3, Deoptimizer::input_offset()));
+  // Preserve "deoptimizer" object in register r2 and get the input
+  // frame descriptor pointer to r3 (deoptimizer->input_);
+  __ LoadP(r3, MemOperand(r2, Deoptimizer::input_offset()));
 
   // Copy core registers into FrameDescription::registers_[kNumRegisters].
+  // DCHECK(Register::kNumRegisters == kNumberOfRegisters);
+  // __ mvc(MemOperand(r3, FrameDescription::registers_offset()),
+  //        MemOperand(sp), kNumberOfRegisters * kPointerSize);
+  // Copy core registers into FrameDescription::registers_[kNumRegisters].
+  // TODO(john.yan): optimize the following code by using mvc instruction
   DCHECK(Register::kNumRegisters == kNumberOfRegisters);
   for (int i = 0; i < kNumberOfRegisters; i++) {
     int offset = (i * kPointerSize) + FrameDescription::registers_offset();
-    __ LoadP(r5, MemOperand(sp, i * kPointerSize));
-    __ StoreP(r5, MemOperand(r4, offset));
+    __ LoadP(r4, MemOperand(sp, i * kPointerSize));
+    __ StoreP(r4, MemOperand(r3, offset));
   }
 
   int double_regs_offset = FrameDescription::double_registers_offset();
   // Copy double registers to
   // double_registers_[DoubleRegister::kNumRegisters]
   for (int i = 0; i < config->num_allocatable_double_registers(); ++i) {
     int code = config->GetAllocatableDoubleCode(i);
     int dst_offset = code * kDoubleSize + double_regs_offset;
     int src_offset = code * kDoubleSize + kNumberOfRegisters * kPointerSize;
-    __ lfd(d0, MemOperand(sp, src_offset));
-    __ stfd(d0, MemOperand(r4, dst_offset));
+    // TODO(joransiu): MVC opportunity
+    __ LoadDouble(d0, MemOperand(sp, src_offset));
+    __ StoreDouble(d0, MemOperand(r3, dst_offset));
   }
 
   // Remove the bailout id and the saved registers from the stack.
-  __ addi(sp, sp, Operand(kSavedRegistersAreaSize + (1 * kPointerSize)));
+  __ la(sp, MemOperand(sp, kSavedRegistersAreaSize + (1 * kPointerSize)));
 
-  // Compute a pointer to the unwinding limit in register r5; that is
+  // Compute a pointer to the unwinding limit in register r4; that is
   // the first stack slot not part of the input frame.
-  __ LoadP(r5, MemOperand(r4, FrameDescription::frame_size_offset()));
-  __ add(r5, r5, sp);
+  __ LoadP(r4, MemOperand(r3, FrameDescription::frame_size_offset()));
+  __ AddP(r4, sp);
 
   // Unwind the stack down to - but not including - the unwinding
   // limit and copy the contents of the activation frame to the input
   // frame description.
-  __ addi(r6, r4, Operand(FrameDescription::frame_content_offset()));
+  __ la(r5, MemOperand(r3, FrameDescription::frame_content_offset()));
   Label pop_loop;
   Label pop_loop_header;
-  __ b(&pop_loop_header);
+  __ b(&pop_loop_header, Label::kNear);
   __ bind(&pop_loop);
-  __ pop(r7);
-  __ StoreP(r7, MemOperand(r6, 0));
-  __ addi(r6, r6, Operand(kPointerSize));
+  __ pop(r6);
+  __ StoreP(r6, MemOperand(r5, 0));
+  __ la(r5, MemOperand(r5, kPointerSize));
   __ bind(&pop_loop_header);
-  __ cmp(r5, sp);
+  __ CmpP(r4, sp);
   __ bne(&pop_loop);
 
   // Compute the output frame in the deoptimizer.
-  __ push(r3);  // Preserve deoptimizer object across call.
-  // r3: deoptimizer object; r4: scratch.
-  __ PrepareCallCFunction(1, r4);
+  __ push(r2);  // Preserve deoptimizer object across call.
+  // r2: deoptimizer object; r3: scratch.
+  __ PrepareCallCFunction(1, r3);
   // Call Deoptimizer::ComputeOutputFrames().
   {
     AllowExternalCallThatCantCauseGC scope(masm());
     __ CallCFunction(
         ExternalReference::compute_output_frames_function(isolate()), 1);
   }
-  __ pop(r3);  // Restore deoptimizer object (class Deoptimizer).
+  __ pop(r2);  // Restore deoptimizer object (class Deoptimizer).
 
   // Replace the current (input) frame with the output frames.
   Label outer_push_loop, inner_push_loop, outer_loop_header, inner_loop_header;
-  // Outer loop state: r7 = current "FrameDescription** output_",
-  // r4 = one past the last FrameDescription**.
-  __ lwz(r4, MemOperand(r3, Deoptimizer::output_count_offset()));
-  __ LoadP(r7, MemOperand(r3, Deoptimizer::output_offset()));  // r7 is output_.
-  __ ShiftLeftImm(r4, r4, Operand(kPointerSizeLog2));
-  __ add(r4, r7, r4);
-  __ b(&outer_loop_header);
+  // Outer loop state: r6 = current "FrameDescription** output_",
+  // r3 = one past the last FrameDescription**.
+  __ LoadlW(r3, MemOperand(r2, Deoptimizer::output_count_offset()));
+  __ LoadP(r6, MemOperand(r2, Deoptimizer::output_offset()));  // r6 is output_.
+  __ ShiftLeftP(r3, r3, Operand(kPointerSizeLog2));
+  __ AddP(r3, r6, r3);
+  __ b(&outer_loop_header, Label::kNear);
 
   __ bind(&outer_push_loop);
-  // Inner loop state: r5 = current FrameDescription*, r6 = loop index.
-  __ LoadP(r5, MemOperand(r7, 0));  // output_[ix]
-  __ LoadP(r6, MemOperand(r5, FrameDescription::frame_size_offset()));
-  __ b(&inner_loop_header);
+  // Inner loop state: r4 = current FrameDescription*, r5 = loop index.
+  __ LoadP(r4, MemOperand(r6, 0));  // output_[ix]
+  __ LoadP(r5, MemOperand(r4, FrameDescription::frame_size_offset()));
+  __ b(&inner_loop_header, Label::kNear);
 
   __ bind(&inner_push_loop);
-  __ addi(r6, r6, Operand(-sizeof(intptr_t)));
-  __ add(r9, r5, r6);
-  __ LoadP(r9, MemOperand(r9, FrameDescription::frame_content_offset()));
-  __ push(r9);
+  __ AddP(r5, Operand(-sizeof(intptr_t)));
+  __ AddP(r8, r4, r5);
+  __ LoadP(r8, MemOperand(r8, FrameDescription::frame_content_offset()));
+  __ push(r8);
 
   __ bind(&inner_loop_header);
-  __ cmpi(r6, Operand::Zero());
+  __ CmpP(r5, Operand::Zero());
   __ bne(&inner_push_loop);  // test for gt?
 
-  __ addi(r7, r7, Operand(kPointerSize));
+  __ AddP(r6, r6, Operand(kPointerSize));
   __ bind(&outer_loop_header);
-  __ cmp(r7, r4);
+  __ CmpP(r6, r3);
   __ blt(&outer_push_loop);
 
-  __ LoadP(r4, MemOperand(r3, Deoptimizer::input_offset()));
+  __ LoadP(r3, MemOperand(r2, Deoptimizer::input_offset()));
   for (int i = 0; i < config->num_allocatable_double_registers(); ++i) {
     int code = config->GetAllocatableDoubleCode(i);
     const DoubleRegister dreg = DoubleRegister::from_code(code);
     int src_offset = code * kDoubleSize + double_regs_offset;
-    __ lfd(dreg, MemOperand(r4, src_offset));
+    __ ld(dreg, MemOperand(r3, src_offset));
   }
 
   // Push state, pc, and continuation from the last output frame.
-  __ LoadP(r9, MemOperand(r5, FrameDescription::state_offset()));
-  __ push(r9);
-  __ LoadP(r9, MemOperand(r5, FrameDescription::pc_offset()));
-  __ push(r9);
-  __ LoadP(r9, MemOperand(r5, FrameDescription::continuation_offset()));
-  __ push(r9);
+  __ LoadP(r8, MemOperand(r4, FrameDescription::state_offset()));
+  __ push(r8);
+  __ LoadP(r8, MemOperand(r4, FrameDescription::pc_offset()));
+  __ push(r8);
+  __ LoadP(r8, MemOperand(r4, FrameDescription::continuation_offset()));
+  __ push(r8);
 
   // Restore the registers from the last output frame.
-  DCHECK(!(ip.bit() & restored_regs));
-  __ mr(ip, r5);
-  for (int i = kNumberOfRegisters - 1; i >= 0; i--) {
+  __ LoadRR(r1, r4);
+  for (int i = kNumberOfRegisters - 1; i > 0; i--) {
     int offset = (i * kPointerSize) + FrameDescription::registers_offset();
     if ((restored_regs & (1 << i)) != 0) {
-      __ LoadP(ToRegister(i), MemOperand(ip, offset));
+      __ LoadP(ToRegister(i), MemOperand(r1, offset));
     }
   }
 
   __ InitializeRootRegister();
 
   __ pop(ip);  // get continuation, leave pc on stack
-  __ pop(r0);
-  __ mtlr(r0);
+  __ pop(r14);
   __ Jump(ip);
   __ stop("Unreachable.");
 }
 
-
 void Deoptimizer::TableEntryGenerator::GeneratePrologue() {
-  Assembler::BlockTrampolinePoolScope block_trampoline_pool(masm());
-
-  // Create a sequence of deoptimization entries.
-  // Note that registers are still live when jumping to an entry.
+  // Create a sequence of deoptimization entries. Note that any
+  // registers may be still live.
   Label done;
   for (int i = 0; i < count(); i++) {
     int start = masm()->pc_offset();
     USE(start);
-    __ li(ip, Operand(i));
+    __ lay(sp, MemOperand(sp, -kPointerSize));
+    __ LoadImmP(ip, Operand(i));
     __ b(&done);
+    int end = masm()->pc_offset();
+    USE(end);
     DCHECK(masm()->pc_offset() - start == table_entry_size_);
   }
   __ bind(&done);
-  __ push(ip);
+  __ StoreP(ip, MemOperand(sp));
 }
 
-
 void FrameDescription::SetCallerPc(unsigned offset, intptr_t value) {
   SetFrameSlot(offset, value);
 }
 
-
 void FrameDescription::SetCallerFp(unsigned offset, intptr_t value) {
   SetFrameSlot(offset, value);
 }
 
-
 void FrameDescription::SetCallerConstantPool(unsigned offset, intptr_t value) {
-  DCHECK(FLAG_enable_embedded_constant_pool);
-  SetFrameSlot(offset, value);
+  // No out-of-line constant pool support.
+  UNREACHABLE();
 }
 
+#undef __
 
-#undef __
 }  // namespace internal
 }  // namespace v8