1 // Copyright 2013 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #if V8_TARGET_ARCH_ARM64
6
7 #include "src/debug/debug.h"
8
9 #include "src/codegen/arm64/macro-assembler-arm64-inl.h"
10 #include "src/debug/liveedit.h"
11 #include "src/execution/frame-constants.h"
12 #include "src/execution/frames-inl.h"
13 #include "src/objects/objects-inl.h"
14
15 namespace v8 {
16 namespace internal {
17
18 #define __ ACCESS_MASM(masm)
19
GenerateHandleDebuggerStatement(MacroAssembler * masm)20 void DebugCodegen::GenerateHandleDebuggerStatement(MacroAssembler* masm) {
21 {
22 FrameScope scope(masm, StackFrame::INTERNAL);
23 __ CallRuntime(Runtime::kHandleDebuggerStatement, 0);
24 }
25 __ MaybeDropFrames();
26
27 // Return to caller.
28 __ Ret();
29 }
30
GenerateFrameDropperTrampoline(MacroAssembler * masm)31 void DebugCodegen::GenerateFrameDropperTrampoline(MacroAssembler* masm) {
32 // Frame is being dropped:
33 // - Drop to the target frame specified by x1.
34 // - Look up current function on the frame.
35 // - Leave the frame.
36 // - Restart the frame by calling the function.
37 __ Mov(fp, x1);
38 __ Ldr(x1, MemOperand(fp, StandardFrameConstants::kFunctionOffset));
39
40 __ Mov(sp, fp);
41 __ Pop<TurboAssembler::kAuthLR>(fp, lr);
42
43 __ LoadTaggedPointerField(
44 x0, FieldMemOperand(x1, JSFunction::kSharedFunctionInfoOffset));
45 __ Ldrh(x0,
46 FieldMemOperand(x0, SharedFunctionInfo::kFormalParameterCountOffset));
47 __ mov(x3, x0);
48
49 __ InvokeFunctionWithNewTarget(x1, x3, x0, JUMP_FUNCTION);
50 }
51
52
53 const bool LiveEdit::kFrameDropperSupported = true;
54
55 } // namespace internal
56 } // namespace v8
57
58 #undef __
59
60 #endif // V8_TARGET_ARCH_ARM64
61