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1 // Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file |
2 // for details. All rights reserved. Use of this source code is governed by a | 2 // for details. All rights reserved. Use of this source code is governed by a |
3 // BSD-style license that can be found in the LICENSE file. | 3 // BSD-style license that can be found in the LICENSE file. |
4 | 4 |
5 #include "vm/globals.h" | 5 #include "vm/globals.h" |
6 #if defined(TARGET_ARCH_IA32) | 6 #if defined(TARGET_ARCH_IA32) |
7 | 7 |
8 #include "vm/debugger.h" | 8 #include "vm/debugger.h" |
9 | 9 |
10 #include "vm/code_patcher.h" | 10 #include "vm/code_patcher.h" |
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29 | 29 |
30 RawObject* ActivationFrame::GetClosureObject(intptr_t num_actual_args) { | 30 RawObject* ActivationFrame::GetClosureObject(intptr_t num_actual_args) { |
31 // At a minimum we have the closure object on the stack. | 31 // At a minimum we have the closure object on the stack. |
32 ASSERT(num_actual_args > 0); | 32 ASSERT(num_actual_args > 0); |
33 // Stack pointer points to last argument that was pushed on the stack. | 33 // Stack pointer points to last argument that was pushed on the stack. |
34 uword closure_addr = sp() + ((num_actual_args - 1) * kWordSize); | 34 uword closure_addr = sp() + ((num_actual_args - 1) * kWordSize); |
35 return reinterpret_cast<RawObject*>( | 35 return reinterpret_cast<RawObject*>( |
36 *reinterpret_cast<uword*>(closure_addr)); | 36 *reinterpret_cast<uword*>(closure_addr)); |
37 } | 37 } |
38 | 38 |
39 | |
40 void CodeBreakpoint::PatchFunctionReturn() { | |
41 uint8_t* code = reinterpret_cast<uint8_t*>(pc_ - 5); | |
42 ASSERT((code[0] == 0x89) && (code[1] == 0xEC)); // mov esp,ebp | |
43 ASSERT(code[2] == 0x5D); // pop ebp | |
44 ASSERT(code[3] == 0xC3); // ret | |
45 ASSERT(code[4] == 0x90); // nop | |
46 | |
47 // Smash code with call instruction and relative target address. | |
48 uword stub_addr = StubCode::BreakpointReturnEntryPoint(); | |
49 code[0] = 0xE8; | |
50 *reinterpret_cast<uword*>(&code[1]) = stub_addr - pc_; | |
51 CPU::FlushICache(pc_ - 5, 5); | |
52 } | |
53 | |
54 | |
55 void CodeBreakpoint::RestoreFunctionReturn() { | |
56 uint8_t* code = reinterpret_cast<uint8_t*>(pc_ - 5); | |
57 ASSERT(code[0] == 0xE8); | |
58 code[0] = 0x89; | |
59 code[1] = 0xEC; // mov esp,ebp | |
60 code[2] = 0x5D; // pop ebp | |
61 code[3] = 0xC3; // ret | |
62 code[4] = 0x90; // nop | |
63 CPU::FlushICache(pc_ - 5, 5); | |
64 } | |
65 | |
66 | |
67 | |
68 } // namespace dart | 39 } // namespace dart |
69 | 40 |
70 #endif // defined TARGET_ARCH_IA32 | 41 #endif // defined TARGET_ARCH_IA32 |
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