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1 // Copyright 2013 the V8 project authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "src/v8.h" | 5 #include "src/v8.h" |
6 | 6 |
7 #if V8_TARGET_ARCH_ARM64 | 7 #if V8_TARGET_ARCH_ARM64 |
8 | 8 |
9 #include "src/codegen.h" | 9 #include "src/codegen.h" |
10 #include "src/debug.h" | 10 #include "src/debug.h" |
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39 | 39 |
40 // The patching code must not overflow the space occupied by the return | 40 // The patching code must not overflow the space occupied by the return |
41 // sequence. | 41 // sequence. |
42 STATIC_ASSERT(Assembler::kJSRetSequenceInstructions >= 5); | 42 STATIC_ASSERT(Assembler::kJSRetSequenceInstructions >= 5); |
43 PatchingAssembler patcher(reinterpret_cast<Instruction*>(rinfo()->pc()), 5); | 43 PatchingAssembler patcher(reinterpret_cast<Instruction*>(rinfo()->pc()), 5); |
44 byte* entry = | 44 byte* entry = |
45 debug_info_->GetIsolate()->builtins()->Return_DebugBreak()->entry(); | 45 debug_info_->GetIsolate()->builtins()->Return_DebugBreak()->entry(); |
46 | 46 |
47 // The first instruction of a patched return sequence must be a load literal | 47 // The first instruction of a patched return sequence must be a load literal |
48 // loading the address of the debug break return code. | 48 // loading the address of the debug break return code. |
49 patcher.LoadLiteral(ip0, 3 * kInstructionSize); | 49 patcher.ldr_pcrel(ip0, (3 * kInstructionSize) >> kLoadLiteralScaleLog2); |
50 // TODO(all): check the following is correct. | 50 // TODO(all): check the following is correct. |
51 // The debug break return code will push a frame and call statically compiled | 51 // The debug break return code will push a frame and call statically compiled |
52 // code. By using blr, even though control will not return after the branch, | 52 // code. By using blr, even though control will not return after the branch, |
53 // this call site will be registered in the frame (lr being saved as the pc | 53 // this call site will be registered in the frame (lr being saved as the pc |
54 // of the next instruction to execute for this frame). The debugger can now | 54 // of the next instruction to execute for this frame). The debugger can now |
55 // iterate on the frames to find call to debug break return code. | 55 // iterate on the frames to find call to debug break return code. |
56 patcher.blr(ip0); | 56 patcher.blr(ip0); |
57 patcher.hlt(kHltBadCode); | 57 patcher.hlt(kHltBadCode); |
58 patcher.dc64(reinterpret_cast<int64_t>(entry)); | 58 patcher.dc64(reinterpret_cast<int64_t>(entry)); |
59 } | 59 } |
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98 | 98 |
99 // The patching code must not overflow the space occupied by the return | 99 // The patching code must not overflow the space occupied by the return |
100 // sequence. | 100 // sequence. |
101 STATIC_ASSERT(Assembler::kDebugBreakSlotInstructions >= 4); | 101 STATIC_ASSERT(Assembler::kDebugBreakSlotInstructions >= 4); |
102 PatchingAssembler patcher(reinterpret_cast<Instruction*>(rinfo()->pc()), 4); | 102 PatchingAssembler patcher(reinterpret_cast<Instruction*>(rinfo()->pc()), 4); |
103 byte* entry = | 103 byte* entry = |
104 debug_info_->GetIsolate()->builtins()->Slot_DebugBreak()->entry(); | 104 debug_info_->GetIsolate()->builtins()->Slot_DebugBreak()->entry(); |
105 | 105 |
106 // The first instruction of a patched debug break slot must be a load literal | 106 // The first instruction of a patched debug break slot must be a load literal |
107 // loading the address of the debug break slot code. | 107 // loading the address of the debug break slot code. |
108 patcher.LoadLiteral(ip0, 2 * kInstructionSize); | 108 patcher.ldr_pcrel(ip0, (2 * kInstructionSize) >> kLoadLiteralScaleLog2); |
109 // TODO(all): check the following is correct. | 109 // TODO(all): check the following is correct. |
110 // The debug break slot code will push a frame and call statically compiled | 110 // The debug break slot code will push a frame and call statically compiled |
111 // code. By using blr, event hough control will not return after the branch, | 111 // code. By using blr, event hough control will not return after the branch, |
112 // this call site will be registered in the frame (lr being saved as the pc | 112 // this call site will be registered in the frame (lr being saved as the pc |
113 // of the next instruction to execute for this frame). The debugger can now | 113 // of the next instruction to execute for this frame). The debugger can now |
114 // iterate on the frames to find call to debug break slot code. | 114 // iterate on the frames to find call to debug break slot code. |
115 patcher.blr(ip0); | 115 patcher.blr(ip0); |
116 patcher.dc64(reinterpret_cast<int64_t>(entry)); | 116 patcher.dc64(reinterpret_cast<int64_t>(entry)); |
117 } | 117 } |
118 | 118 |
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348 void DebugCodegen::GenerateFrameDropperLiveEdit(MacroAssembler* masm) { | 348 void DebugCodegen::GenerateFrameDropperLiveEdit(MacroAssembler* masm) { |
349 masm->Abort(kLiveEditFrameDroppingIsNotSupportedOnARM64); | 349 masm->Abort(kLiveEditFrameDroppingIsNotSupportedOnARM64); |
350 } | 350 } |
351 | 351 |
352 | 352 |
353 const bool LiveEdit::kFrameDropperSupported = false; | 353 const bool LiveEdit::kFrameDropperSupported = false; |
354 | 354 |
355 } } // namespace v8::internal | 355 } } // namespace v8::internal |
356 | 356 |
357 #endif // V8_TARGET_ARCH_ARM64 | 357 #endif // V8_TARGET_ARCH_ARM64 |
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