1 files changed, 252 insertions, 0 deletions
diff --git a/deps/v8/src/deoptimizer/s390/deoptimizer-s390.cc b/deps/v8/src/deoptimizer/s390/deoptimizer-s390.cc
new file mode 100644
index 0000000000..db2330a8e8
--- /dev/null
+++ b/deps/v8/src/deoptimizer/s390/deoptimizer-s390.cc
@@ -0,0 +1,252 @@
+// 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/codegen/macro-assembler.h"
+#include "src/codegen/register-configuration.h"
+#include "src/codegen/safepoint-table.h"
+#include "src/deoptimizer/deoptimizer.h"
+
+namespace v8 {
+namespace internal {
+
+#define __ masm->
+
+// This code tries to be close to ia32 code so that any changes can be
+// easily ported.
+void Deoptimizer::GenerateDeoptimizationEntries(MacroAssembler* masm,
+                                                Isolate* isolate,
+                                                DeoptimizeKind deopt_kind) {
+  NoRootArrayScope no_root_array(masm);
+
+  // Save all the registers onto the stack
+  const int kNumberOfRegisters = Register::kNumRegisters;
+
+  RegList restored_regs = kJSCallerSaved | kCalleeSaved;
+
+  const int kDoubleRegsSize = kDoubleSize * DoubleRegister::kNumRegisters;
+  const int kFloatRegsSize = kFloatSize * FloatRegister::kNumRegisters;
+
+  // Save all double registers before messing with them.
+  __ lay(sp, MemOperand(sp, -kDoubleRegsSize));
+  const RegisterConfiguration* config = RegisterConfiguration::Default();
+  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;
+    __ StoreDouble(dreg, MemOperand(sp, offset));
+  }
+  // Save all float registers before messing with them.
+  __ lay(sp, MemOperand(sp, -kFloatRegsSize));
+  for (int i = 0; i < config->num_allocatable_float_registers(); ++i) {
+    int code = config->GetAllocatableFloatCode(i);
+    const FloatRegister dreg = FloatRegister::from_code(code);
+    int offset = code * kFloatSize;
+    __ StoreFloat32(dreg, MemOperand(sp, offset));
+  }
+
+  // Push all GPRs onto the stack
+  __ lay(sp, MemOperand(sp, -kNumberOfRegisters * kPointerSize));
+  __ StoreMultipleP(r0, sp, MemOperand(sp));  // Save all 16 registers
+
+  __ mov(r1, Operand(ExternalReference::Create(
+                 IsolateAddressId::kCEntryFPAddress, isolate)));
+  __ StoreP(fp, MemOperand(r1));
+
+  const int kSavedRegistersAreaSize =
+      (kNumberOfRegisters * kPointerSize) + kDoubleRegsSize + kFloatRegsSize;
+
+  // The bailout id is passed using r10
+  __ LoadRR(r4, r10);
+
+  // 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 r6.
+  __ LoadRR(r5, r14);
+
+  __ la(r6, MemOperand(sp, kSavedRegistersAreaSize));
+  __ SubP(r6, fp, r6);
+
+  // Allocate a new deoptimizer object.
+  // Pass six arguments in r2 to r7.
+  __ PrepareCallCFunction(6, r7);
+  __ LoadImmP(r2, Operand::Zero());
+  Label context_check;
+  __ LoadP(r3, MemOperand(fp, CommonFrameConstants::kContextOrFrameTypeOffset));
+  __ JumpIfSmi(r3, &context_check);
+  __ LoadP(r2, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
+  __ bind(&context_check);
+  __ LoadImmP(r3, Operand(static_cast<int>(deopt_kind)));
+  // 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(), 6);
+  }
+
+  // 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_EQ(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_EQ(Register::kNumRegisters, kNumberOfRegisters);
+  for (int i = 0; i < kNumberOfRegisters; i++) {
+    int offset = (i * kPointerSize) + FrameDescription::registers_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 + kFloatRegsSize;
+    // TODO(joransiu): MVC opportunity
+    __ LoadDouble(d0, MemOperand(sp, src_offset));
+    __ StoreDouble(d0, MemOperand(r3, dst_offset));
+  }
+
+  int float_regs_offset = FrameDescription::float_registers_offset();
+  // Copy float registers to
+  // float_registers_[FloatRegister::kNumRegisters]
+  for (int i = 0; i < config->num_allocatable_float_registers(); ++i) {
+    int code = config->GetAllocatableFloatCode(i);
+    int dst_offset = code * kFloatSize + float_regs_offset;
+    int src_offset = code * kFloatSize + kNumberOfRegisters * kPointerSize;
+    // TODO(joransiu): MVC opportunity
+    __ LoadFloat32(d0, MemOperand(sp, src_offset));
+    __ StoreFloat32(d0, MemOperand(r3, dst_offset));
+  }
+
+  // Remove the saved registers from the stack.
+  __ la(sp, MemOperand(sp, kSavedRegistersAreaSize));
+
+  // Compute a pointer to the unwinding limit in register r4; that is
+  // the first stack slot not part of the input frame.
+  __ 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.
+  __ la(r5, MemOperand(r3, FrameDescription::frame_content_offset()));
+  Label pop_loop;
+  Label pop_loop_header;
+  __ b(&pop_loop_header, Label::kNear);
+  __ bind(&pop_loop);
+  __ pop(r6);
+  __ StoreP(r6, MemOperand(r5, 0));
+  __ la(r5, MemOperand(r5, kPointerSize));
+  __ bind(&pop_loop_header);
+  __ CmpP(r4, sp);
+  __ bne(&pop_loop);
+
+  // Compute the output frame in the deoptimizer.
+  __ 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(), 1);
+  }
+  __ pop(r2);  // Restore deoptimizer object (class Deoptimizer).
+
+  __ LoadP(sp, MemOperand(r2, Deoptimizer::caller_frame_top_offset()));
+
+  // 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: 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: 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);
+  __ SubP(r5, Operand(sizeof(intptr_t)));
+  __ AddP(r8, r4, r5);
+  __ LoadP(r8, MemOperand(r8, FrameDescription::frame_content_offset()));
+  __ push(r8);
+
+  __ bind(&inner_loop_header);
+  __ CmpP(r5, Operand::Zero());
+  __ bne(&inner_push_loop);  // test for gt?
+
+  __ AddP(r6, r6, Operand(kPointerSize));
+  __ bind(&outer_loop_header);
+  __ CmpP(r6, r3);
+  __ blt(&outer_push_loop);
+
+  __ 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;
+    __ ld(dreg, MemOperand(r3, src_offset));
+  }
+
+  // Push pc and continuation from the last output frame.
+  __ 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.
+  __ 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(r1, offset));
+    }
+  }
+
+  __ pop(ip);  // get continuation, leave pc on stack
+  __ pop(r14);
+  __ Jump(ip);
+  __ stop("Unreachable.");
+}
+
+bool Deoptimizer::PadTopOfStackRegister() { return false; }
+
+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) {
+  // No out-of-line constant pool support.
+  UNREACHABLE();
+}
+
+#undef __
+
+}  // namespace internal
+}  // namespace v8