1 files changed, 150 insertions, 0 deletions
diff --git a/deps/v8/src/debug/mips64/debug-mips64.cc b/deps/v8/src/debug/mips64/debug-mips64.cc
new file mode 100644
index 0000000000..9b4d355d79
--- /dev/null
+++ b/deps/v8/src/debug/mips64/debug-mips64.cc
@@ -0,0 +1,150 @@
+// Copyright 2012 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.
+
+#if V8_TARGET_ARCH_MIPS64
+
+#include "src/codegen.h"
+#include "src/debug/debug.h"
+
+namespace v8 {
+namespace internal {
+
+#define __ ACCESS_MASM(masm)
+
+void EmitDebugBreakSlot(MacroAssembler* masm) {
+  Label check_size;
+  __ bind(&check_size);
+  for (int i = 0; i < Assembler::kDebugBreakSlotInstructions; i++) {
+    __ nop(MacroAssembler::DEBUG_BREAK_NOP);
+  }
+  DCHECK_EQ(Assembler::kDebugBreakSlotInstructions,
+            masm->InstructionsGeneratedSince(&check_size));
+}
+
+
+void DebugCodegen::GenerateSlot(MacroAssembler* masm, RelocInfo::Mode mode,
+                                int call_argc) {
+  // Generate enough nop's to make space for a call instruction. Avoid emitting
+  // the trampoline pool in the debug break slot code.
+  Assembler::BlockTrampolinePoolScope block_pool(masm);
+  masm->RecordDebugBreakSlot(mode, call_argc);
+  EmitDebugBreakSlot(masm);
+}
+
+
+void DebugCodegen::ClearDebugBreakSlot(Address pc) {
+  CodePatcher patcher(pc, Assembler::kDebugBreakSlotInstructions);
+  EmitDebugBreakSlot(patcher.masm());
+}
+
+
+void DebugCodegen::PatchDebugBreakSlot(Address pc, Handle<Code> code) {
+  DCHECK_EQ(Code::BUILTIN, code->kind());
+  CodePatcher patcher(pc, Assembler::kDebugBreakSlotInstructions);
+  // Patch the code changing the debug break slot code from:
+  //   nop(DEBUG_BREAK_NOP) - nop(1) is sll(zero_reg, zero_reg, 1)
+  //   nop(DEBUG_BREAK_NOP)
+  //   nop(DEBUG_BREAK_NOP)
+  //   nop(DEBUG_BREAK_NOP)
+  //   nop(DEBUG_BREAK_NOP)
+  //   nop(DEBUG_BREAK_NOP)
+  // to a call to the debug break slot code.
+  //   li t9, address   (4-instruction sequence on mips64)
+  //   call t9          (jalr t9 / nop instruction pair)
+  patcher.masm()->li(v8::internal::t9,
+                     Operand(reinterpret_cast<int64_t>(code->entry())),
+                     ADDRESS_LOAD);
+  patcher.masm()->Call(v8::internal::t9);
+}
+
+
+void DebugCodegen::GenerateDebugBreakStub(MacroAssembler* masm,
+                                          DebugBreakCallHelperMode mode) {
+  __ RecordComment("Debug break");
+  {
+    FrameScope scope(masm, StackFrame::INTERNAL);
+
+    // Load padding words on stack.
+    __ li(at, Operand(Smi::FromInt(LiveEdit::kFramePaddingValue)));
+    __ Dsubu(sp, sp,
+            Operand(kPointerSize * LiveEdit::kFramePaddingInitialSize));
+    for (int i = LiveEdit::kFramePaddingInitialSize - 1; i >= 0; i--) {
+      __ sd(at, MemOperand(sp, kPointerSize * i));
+    }
+    __ li(at, Operand(Smi::FromInt(LiveEdit::kFramePaddingInitialSize)));
+    __ push(at);
+
+    if (mode == SAVE_RESULT_REGISTER) __ push(v0);
+
+    __ PrepareCEntryArgs(0);  // No arguments.
+    __ PrepareCEntryFunction(ExternalReference(
+        Runtime::FunctionForId(Runtime::kDebugBreak), masm->isolate()));
+
+    CEntryStub ceb(masm->isolate(), 1);
+    __ CallStub(&ceb);
+
+    if (FLAG_debug_code) {
+      for (int i = 0; i < kNumJSCallerSaved; i++) {
+        Register reg = {JSCallerSavedCode(i)};
+        __ li(reg, kDebugZapValue);
+      }
+    }
+
+    if (mode == SAVE_RESULT_REGISTER) __ pop(v0);
+
+    // Don't bother removing padding bytes pushed on the stack
+    // as the frame is going to be restored right away.
+
+    // Leave the internal frame.
+  }
+
+  // Now that the break point has been handled, resume normal execution by
+  // jumping to the target address intended by the caller and that was
+  // overwritten by the address of DebugBreakXXX.
+  ExternalReference after_break_target =
+      ExternalReference::debug_after_break_target_address(masm->isolate());
+  __ li(t9, Operand(after_break_target));
+  __ ld(t9, MemOperand(t9));
+  __ Jump(t9);
+}
+
+
+void DebugCodegen::GeneratePlainReturnLiveEdit(MacroAssembler* masm) {
+  __ Ret();
+}
+
+
+void DebugCodegen::GenerateFrameDropperLiveEdit(MacroAssembler* masm) {
+  ExternalReference restarter_frame_function_slot =
+      ExternalReference::debug_restarter_frame_function_pointer_address(
+          masm->isolate());
+  __ li(at, Operand(restarter_frame_function_slot));
+  __ sw(zero_reg, MemOperand(at, 0));
+
+  // We do not know our frame height, but set sp based on fp.
+  __ Dsubu(sp, fp, Operand(kPointerSize));
+
+  __ Pop(ra, fp, a1);  // Return address, Frame, Function.
+
+  // Load context from the function.
+  __ ld(cp, FieldMemOperand(a1, JSFunction::kContextOffset));
+
+  // Get function code.
+  __ ld(at, FieldMemOperand(a1, JSFunction::kSharedFunctionInfoOffset));
+  __ ld(at, FieldMemOperand(at, SharedFunctionInfo::kCodeOffset));
+  __ Daddu(t9, at, Operand(Code::kHeaderSize - kHeapObjectTag));
+
+  // Re-run JSFunction, a1 is function, cp is context.
+  __ Jump(t9);
+}
+
+
+const bool LiveEdit::kFrameDropperSupported = true;
+
+#undef __
+
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_TARGET_ARCH_MIPS64