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1 // Copyright 2013 the V8 project authors. All rights reserved. | |
2 // Redistribution and use in source and binary forms, with or without | |
3 // modification, are permitted provided that the following conditions are | |
4 // met: | |
5 // | |
6 // * Redistributions of source code must retain the above copyright | |
7 // notice, this list of conditions and the following disclaimer. | |
8 // * Redistributions in binary form must reproduce the above | |
9 // copyright notice, this list of conditions and the following | |
10 // disclaimer in the documentation and/or other materials provided | |
11 // with the distribution. | |
12 // * Neither the name of Google Inc. nor the names of its | |
13 // contributors may be used to endorse or promote products derived | |
14 // from this software without specific prior written permission. | |
15 // | |
16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
27 | |
28 #if V8_TARGET_ARCH_A64 | |
29 | |
30 #if defined(USE_SIMULATOR) | |
31 | |
32 #include "a64/debugger-a64.h" | |
33 | |
34 namespace v8 { | |
35 namespace internal { | |
36 | |
37 | |
38 void Debugger::VisitException(Instruction* instr) { | |
39 switch (instr->Mask(ExceptionMask)) { | |
40 case HLT: { | |
41 if (instr->ImmException() == kImmExceptionIsDebug) { | |
42 // Read the arguments encoded inline in the instruction stream. | |
43 uint32_t code; | |
44 uint32_t parameters; | |
45 char const * message; | |
46 | |
47 ASSERT(sizeof(*pc_) == 1); | |
48 memcpy(&code, pc_ + kDebugCodeOffset, sizeof(code)); | |
49 memcpy(¶meters, pc_ + kDebugParamsOffset, sizeof(parameters)); | |
50 message = reinterpret_cast<char const *>(pc_ + kDebugMessageOffset); | |
51 | |
52 if (message[0] == '\0') { | |
53 fprintf(stream_, "Debugger hit %" PRIu32 ".\n", code); | |
54 } else { | |
55 fprintf(stream_, "Debugger hit %" PRIu32 ": %s\n", code, message); | |
56 } | |
57 | |
58 // Other options. | |
59 switch (parameters & kDebuggerTracingDirectivesMask) { | |
60 case TRACE_ENABLE: | |
61 set_log_parameters(log_parameters() | parameters); | |
62 break; | |
63 case TRACE_DISABLE: | |
64 set_log_parameters(log_parameters() & ~parameters); | |
65 break; | |
66 case TRACE_OVERRIDE: | |
67 set_log_parameters(parameters); | |
68 break; | |
69 default: | |
70 // We don't support a one-shot LOG_DISASM. | |
71 ASSERT((parameters & LOG_DISASM) == 0); | |
72 // Don't print information that is already being traced. | |
73 parameters &= ~log_parameters(); | |
74 // Print the requested information. | |
75 if (parameters & LOG_SYS_REGS) PrintSystemRegisters(true); | |
76 if (parameters & LOG_REGS) PrintRegisters(true); | |
77 if (parameters & LOG_FP_REGS) PrintFPRegisters(true); | |
78 } | |
79 | |
80 // Check if the debugger should break. | |
81 if (parameters & BREAK) OS::DebugBreak(); | |
82 | |
83 // The stop parameters are inlined in the code. Skip them: | |
84 // - Skip to the end of the message string. | |
85 pc_ += kDebugMessageOffset + strlen(message) + 1; | |
86 // - Advance to the next aligned location. | |
87 pc_ = AlignUp(pc_, kInstructionSize); | |
88 // - Verify that the unreachable marker is present. | |
89 ASSERT(reinterpret_cast<Instruction*>(pc_)->Mask(ExceptionMask) == HLT); | |
90 ASSERT(reinterpret_cast<Instruction*>(pc_)->ImmException() == | |
91 kImmExceptionIsUnreachable); | |
92 // - Skip past the unreachable marker. | |
93 pc_ += kInstructionSize; | |
94 pc_modified_ = true; | |
95 } else { | |
96 Simulator::VisitException(instr); | |
97 } | |
98 break; | |
99 } | |
100 | |
101 default: | |
102 UNIMPLEMENTED(); | |
103 } | |
104 } | |
105 | |
106 | |
107 } } // namespace v8::internal | |
108 | |
109 #endif // USE_SIMULATOR | |
110 | |
111 #endif // V8_TARGET_ARCH_A64 | |
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