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1 // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2013, 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_MIPS) | 6 #if defined(TARGET_ARCH_MIPS) |
7 | 7 |
8 #include "vm/cpu.h" | 8 #include "vm/cpu.h" |
9 #include "vm/debugger.h" | 9 #include "vm/debugger.h" |
10 #include "vm/instructions.h" | 10 #include "vm/instructions.h" |
(...skipping 13 matching lines...) Expand all Loading... |
24 | 24 |
25 RawObject* ActivationFrame::GetClosureObject(intptr_t num_actual_args) { | 25 RawObject* ActivationFrame::GetClosureObject(intptr_t num_actual_args) { |
26 // At a minimum we have the closure object on the stack. | 26 // At a minimum we have the closure object on the stack. |
27 ASSERT(num_actual_args > 0); | 27 ASSERT(num_actual_args > 0); |
28 // Stack pointer points to last argument that was pushed on the stack. | 28 // Stack pointer points to last argument that was pushed on the stack. |
29 uword closure_addr = sp() + ((num_actual_args - 1) * kWordSize); | 29 uword closure_addr = sp() + ((num_actual_args - 1) * kWordSize); |
30 return reinterpret_cast<RawObject*>( | 30 return reinterpret_cast<RawObject*>( |
31 *reinterpret_cast<uword*>(closure_addr)); | 31 *reinterpret_cast<uword*>(closure_addr)); |
32 } | 32 } |
33 | 33 |
34 | |
35 void CodeBreakpoint::PatchFunctionReturn() { | |
36 Instr* instr1 = Instr::At(pc_ - 5 * Instr::kInstrSize); | |
37 Instr* instr2 = Instr::At(pc_ - 4 * Instr::kInstrSize); | |
38 Instr* instr3 = Instr::At(pc_ - 3 * Instr::kInstrSize); | |
39 Instr* instr4 = Instr::At(pc_ - 2 * Instr::kInstrSize); | |
40 Instr* instr5 = Instr::At(pc_ - 1 * Instr::kInstrSize); | |
41 | |
42 #if defined(DEBUG) | |
43 instr1->AssertIsImmInstr(LW, SP, RA, 2 * kWordSize); | |
44 instr2->AssertIsImmInstr(LW, SP, FP, 1 * kWordSize); | |
45 instr3->AssertIsImmInstr(LW, SP, PP, 0 * kWordSize); | |
46 instr4->AssertIsSpecialInstr(JR, RA, ZR, ZR); | |
47 instr5->AssertIsImmInstr(ADDIU, SP, SP, 4 * kWordSize); | |
48 #endif // defined(DEBUG) | |
49 | |
50 // Smash code with call instruction and target address. | |
51 uword stub_addr = StubCode::BreakpointReturnEntryPoint(); | |
52 uint16_t target_lo = stub_addr & 0xffff; | |
53 uint16_t target_hi = stub_addr >> 16; | |
54 | |
55 // Unlike other architectures, the sequence we are patching in is shorter | |
56 // than the sequence we are replacing. We pad at the top with nops so that | |
57 // the end of the new sequence is lined up with the code descriptor. | |
58 instr1->SetInstructionBits(Instr::kNopInstruction); | |
59 instr2->SetImmInstrBits(LUI, ZR, TMP, target_hi); | |
60 instr3->SetImmInstrBits(ORI, TMP, TMP, target_lo); | |
61 instr4->SetSpecialInstrBits(JALR, TMP, ZR, RA); | |
62 instr5->SetInstructionBits(Instr::kNopInstruction); | |
63 | |
64 CPU::FlushICache(pc_ - 5 * Instr::kInstrSize, 5 * Instr::kInstrSize); | |
65 } | |
66 | |
67 | |
68 void CodeBreakpoint::RestoreFunctionReturn() { | |
69 Instr* instr1 = Instr::At(pc_ - 5 * Instr::kInstrSize); | |
70 Instr* instr2 = Instr::At(pc_ - 4 * Instr::kInstrSize); | |
71 Instr* instr3 = Instr::At(pc_ - 3 * Instr::kInstrSize); | |
72 Instr* instr4 = Instr::At(pc_ - 2 * Instr::kInstrSize); | |
73 Instr* instr5 = Instr::At(pc_ - 1 * Instr::kInstrSize); | |
74 | |
75 ASSERT(instr2->OpcodeField() == LUI && instr2->RtField() == TMP); | |
76 | |
77 instr1->SetImmInstrBits(LW, SP, RA, 2 * kWordSize); | |
78 instr2->SetImmInstrBits(LW, SP, FP, 1 * kWordSize); | |
79 instr3->SetImmInstrBits(LW, SP, PP, 0 * kWordSize); | |
80 instr4->SetSpecialInstrBits(JR, RA, ZR, ZR); | |
81 instr5->SetImmInstrBits(ADDIU, SP, SP, 4 * kWordSize); | |
82 | |
83 CPU::FlushICache(pc_ - 5 * Instr::kInstrSize, 5 * Instr::kInstrSize); | |
84 } | |
85 | |
86 } // namespace dart | 34 } // namespace dart |
87 | 35 |
88 #endif // defined TARGET_ARCH_MIPS | 36 #endif // defined TARGET_ARCH_MIPS |
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