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1 // Copyright 2012 the V8 project authors. All rights reserved. | 1 // Copyright 2012 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_ARM | 7 #if V8_TARGET_ARCH_ARM |
8 | 8 |
9 #include "src/codegen.h" | 9 #include "src/codegen.h" |
10 #include "src/debug.h" | 10 #include "src/debug.h" |
11 | 11 |
12 namespace v8 { | 12 namespace v8 { |
13 namespace internal { | 13 namespace internal { |
14 | 14 |
15 bool BreakLocationIterator::IsDebugBreakAtReturn() { | 15 void BreakLocation::SetDebugBreakAtReturn() { |
16 return Debug::IsDebugBreakAtReturn(rinfo()); | |
17 } | |
18 | |
19 | |
20 void BreakLocationIterator::SetDebugBreakAtReturn() { | |
21 // Patch the code changing the return from JS function sequence from | 16 // Patch the code changing the return from JS function sequence from |
22 // mov sp, fp | 17 // mov sp, fp |
23 // ldmia sp!, {fp, lr} | 18 // ldmia sp!, {fp, lr} |
24 // add sp, sp, #4 | 19 // add sp, sp, #4 |
25 // bx lr | 20 // bx lr |
26 // to a call to the debug break return code. | 21 // to a call to the debug break return code. |
27 // ldr ip, [pc, #0] | 22 // ldr ip, [pc, #0] |
28 // blx ip | 23 // blx ip |
29 // <debug break return code entry point address> | 24 // <debug break return code entry point address> |
30 // bkpt 0 | 25 // bkpt 0 |
31 CodePatcher patcher(rinfo()->pc(), Assembler::kJSReturnSequenceInstructions); | 26 CodePatcher patcher(pc(), Assembler::kJSReturnSequenceInstructions); |
32 patcher.masm()->ldr(v8::internal::ip, MemOperand(v8::internal::pc, 0)); | 27 patcher.masm()->ldr(v8::internal::ip, MemOperand(v8::internal::pc, 0)); |
33 patcher.masm()->blx(v8::internal::ip); | 28 patcher.masm()->blx(v8::internal::ip); |
34 patcher.Emit( | 29 patcher.Emit( |
35 debug_info_->GetIsolate()->builtins()->Return_DebugBreak()->entry()); | 30 debug_info_->GetIsolate()->builtins()->Return_DebugBreak()->entry()); |
36 patcher.masm()->bkpt(0); | 31 patcher.masm()->bkpt(0); |
37 } | 32 } |
38 | 33 |
39 | 34 |
40 // Restore the JS frame exit code. | 35 void BreakLocation::SetDebugBreakAtSlot() { |
41 void BreakLocationIterator::ClearDebugBreakAtReturn() { | |
42 rinfo()->PatchCode(original_rinfo()->pc(), | |
43 Assembler::kJSReturnSequenceInstructions); | |
44 } | |
45 | |
46 | |
47 // A debug break in the frame exit code is identified by the JS frame exit code | |
48 // having been patched with a call instruction. | |
49 bool Debug::IsDebugBreakAtReturn(RelocInfo* rinfo) { | |
50 DCHECK(RelocInfo::IsJSReturn(rinfo->rmode())); | |
51 return rinfo->IsPatchedReturnSequence(); | |
52 } | |
53 | |
54 | |
55 bool BreakLocationIterator::IsDebugBreakAtSlot() { | |
56 DCHECK(IsDebugBreakSlot()); | |
57 // Check whether the debug break slot instructions have been patched. | |
58 return rinfo()->IsPatchedDebugBreakSlotSequence(); | |
59 } | |
60 | |
61 | |
62 void BreakLocationIterator::SetDebugBreakAtSlot() { | |
63 DCHECK(IsDebugBreakSlot()); | 36 DCHECK(IsDebugBreakSlot()); |
64 // Patch the code changing the debug break slot code from | 37 // Patch the code changing the debug break slot code from |
65 // mov r2, r2 | 38 // mov r2, r2 |
66 // mov r2, r2 | 39 // mov r2, r2 |
67 // mov r2, r2 | 40 // mov r2, r2 |
68 // to a call to the debug break slot code. | 41 // to a call to the debug break slot code. |
69 // ldr ip, [pc, #0] | 42 // ldr ip, [pc, #0] |
70 // blx ip | 43 // blx ip |
71 // <debug break slot code entry point address> | 44 // <debug break slot code entry point address> |
72 CodePatcher patcher(rinfo()->pc(), Assembler::kDebugBreakSlotInstructions); | 45 CodePatcher patcher(pc(), Assembler::kDebugBreakSlotInstructions); |
73 patcher.masm()->ldr(v8::internal::ip, MemOperand(v8::internal::pc, 0)); | 46 patcher.masm()->ldr(v8::internal::ip, MemOperand(v8::internal::pc, 0)); |
74 patcher.masm()->blx(v8::internal::ip); | 47 patcher.masm()->blx(v8::internal::ip); |
75 patcher.Emit( | 48 patcher.Emit( |
76 debug_info_->GetIsolate()->builtins()->Slot_DebugBreak()->entry()); | 49 debug_info_->GetIsolate()->builtins()->Slot_DebugBreak()->entry()); |
77 } | 50 } |
78 | 51 |
79 | 52 |
80 void BreakLocationIterator::ClearDebugBreakAtSlot() { | |
81 DCHECK(IsDebugBreakSlot()); | |
82 rinfo()->PatchCode(original_rinfo()->pc(), | |
83 Assembler::kDebugBreakSlotInstructions); | |
84 } | |
85 | |
86 | |
87 #define __ ACCESS_MASM(masm) | 53 #define __ ACCESS_MASM(masm) |
88 | 54 |
89 | 55 |
90 static void Generate_DebugBreakCallHelper(MacroAssembler* masm, | 56 static void Generate_DebugBreakCallHelper(MacroAssembler* masm, |
91 RegList object_regs, | 57 RegList object_regs, |
92 RegList non_object_regs) { | 58 RegList non_object_regs) { |
93 { | 59 { |
94 FrameAndConstantPoolScope scope(masm, StackFrame::INTERNAL); | 60 FrameAndConstantPoolScope scope(masm, StackFrame::INTERNAL); |
95 | 61 |
96 // Load padding words on stack. | 62 // Load padding words on stack. |
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319 } | 285 } |
320 | 286 |
321 | 287 |
322 const bool LiveEdit::kFrameDropperSupported = true; | 288 const bool LiveEdit::kFrameDropperSupported = true; |
323 | 289 |
324 #undef __ | 290 #undef __ |
325 | 291 |
326 } } // namespace v8::internal | 292 } } // namespace v8::internal |
327 | 293 |
328 #endif // V8_TARGET_ARCH_ARM | 294 #endif // V8_TARGET_ARCH_ARM |
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