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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_X64) | 6 #if defined(TARGET_ARCH_X64) |
7 | 7 |
8 #include "vm/debugger.h" | 8 #include "vm/debugger.h" |
9 | 9 |
10 #include "vm/assembler.h" | 10 #include "vm/assembler.h" |
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25 | 25 |
26 RawObject* ActivationFrame::GetClosureObject(intptr_t num_actual_args) { | 26 RawObject* ActivationFrame::GetClosureObject(intptr_t num_actual_args) { |
27 // At a minimum we have the closure object on the stack. | 27 // At a minimum we have the closure object on the stack. |
28 ASSERT(num_actual_args > 0); | 28 ASSERT(num_actual_args > 0); |
29 // Stack pointer points to last argument that was pushed on the stack. | 29 // Stack pointer points to last argument that was pushed on the stack. |
30 uword closure_addr = sp() + ((num_actual_args - 1) * kWordSize); | 30 uword closure_addr = sp() + ((num_actual_args - 1) * kWordSize); |
31 return reinterpret_cast<RawObject*>( | 31 return reinterpret_cast<RawObject*>( |
32 *reinterpret_cast<uword*>(closure_addr)); | 32 *reinterpret_cast<uword*>(closure_addr)); |
33 } | 33 } |
34 | 34 |
35 | |
36 void CodeBreakpoint::PatchFunctionReturn() { | |
37 uint8_t* code = reinterpret_cast<uint8_t*>(pc_ - 13); | |
38 ASSERT((code[0] == 0x4c) && (code[1] == 0x8b) && (code[2] == 0x7d) && | |
39 (code[3] == 0xf0)); // movq r15,[rbp-0x10] | |
40 ASSERT((code[4] == 0x48) && (code[5] == 0x89) && | |
41 (code[6] == 0xec)); // mov rsp, rbp | |
42 ASSERT(code[7] == 0x5d); // pop rbp | |
43 ASSERT(code[8] == 0xc3); // ret | |
44 ASSERT((code[9] == 0x0F) && (code[10] == 0x1F) && (code[11] == 0x40) && | |
45 (code[12] == 0x00)); // nops | |
46 // Smash code with call instruction and relative target address. | |
47 uword stub_addr = StubCode::BreakpointReturnEntryPoint(); | |
48 code[0] = 0x49; | |
49 code[1] = 0xbb; | |
50 *reinterpret_cast<uword*>(&code[2]) = stub_addr; | |
51 code[10] = 0x41; | |
52 code[11] = 0xff; | |
53 code[12] = 0xd3; | |
54 CPU::FlushICache(pc_ - 13, 13); | |
55 } | |
56 | |
57 | |
58 void CodeBreakpoint::RestoreFunctionReturn() { | |
59 uint8_t* code = reinterpret_cast<uint8_t*>(pc_ - 13); | |
60 ASSERT((code[0] == 0x49) && (code[1] == 0xbb)); | |
61 | |
62 MemoryRegion code_region(reinterpret_cast<void*>(pc_ - 13), 13); | |
63 Assembler assembler; | |
64 | |
65 assembler.ReturnPatchable(); | |
66 assembler.FinalizeInstructions(code_region); | |
67 | |
68 CPU::FlushICache(pc_ - 13, 13); | |
69 } | |
70 | |
71 } // namespace dart | 35 } // namespace dart |
72 | 36 |
73 #endif // defined TARGET_ARCH_X64 | 37 #endif // defined TARGET_ARCH_X64 |
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