The Tor Browser / file comparison
comparison: toolkit/crashreporter/google-breakpad/src/processor/disassembler_x86.h
toolkit/crashreporter/google-breakpad/src/processor/disassembler_x86.h
- changeset 0
- 6474c204b198
equal
deleted
inserted
replaced
| -1:000000000000 | 0:2222deeed209 |
|---|---|
| 1 // All rights reserved. | |
| 2 // | |
| 3 // Redistribution and use in source and binary forms, with or without | |
| 4 // modification, are permitted provided that the following conditions are | |
| 5 // met: | |
| 6 // | |
| 7 // * Redistributions of source code must retain the above copyright | |
| 8 // notice, this list of conditions and the following disclaimer. | |
| 9 // * Redistributions in binary form must reproduce the above | |
| 10 // copyright notice, this list of conditions and the following disclaimer | |
| 11 // in the documentation and/or other materials provided with the | |
| 12 // distribution. | |
| 13 // * Neither the name of Google Inc. nor the names of its | |
| 14 // contributors may be used to endorse or promote products derived from | |
| 15 // this software without specific prior written permission. | |
| 16 // | |
| 17 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
| 18 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
| 19 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
| 20 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
| 21 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
| 22 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
| 23 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
| 24 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
| 25 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 26 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| 27 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 28 | |
| 29 // disassembler_x86.h: Basic x86 bytecode disassembler | |
| 30 // | |
| 31 // Provides a simple disassembler which wraps libdisasm. This allows simple | |
| 32 // tests to be run against bytecode to test for various properties. | |
| 33 // | |
| 34 // Author: Cris Neckar | |
| 35 | |
| 36 #ifndef GOOGLE_BREAKPAD_PROCESSOR_DISASSEMBLER_X86_H_ | |
| 37 #define GOOGLE_BREAKPAD_PROCESSOR_DISASSEMBLER_X86_H_ | |
| 38 | |
| 39 #include <stddef.h> | |
| 40 #include <sys/types.h> | |
| 41 | |
| 42 #include "google_breakpad/common/breakpad_types.h" | |
| 43 | |
| 44 namespace libdis { | |
| 45 #include "third_party/libdisasm/libdis.h" | |
| 46 } | |
| 47 | |
| 48 namespace google_breakpad { | |
| 49 | |
| 50 enum { | |
| 51 DISX86_NONE = 0x0, | |
| 52 DISX86_BAD_BRANCH_TARGET = 0x1, | |
| 53 DISX86_BAD_ARGUMENT_PASSED = 0x2, | |
| 54 DISX86_BAD_WRITE = 0x4, | |
| 55 DISX86_BAD_BLOCK_WRITE = 0x8, | |
| 56 DISX86_BAD_READ = 0x10, | |
| 57 DISX86_BAD_BLOCK_READ = 0x20, | |
| 58 DISX86_BAD_COMPARISON = 0x40 | |
| 59 }; | |
| 60 | |
| 61 class DisassemblerX86 { | |
| 62 public: | |
| 63 // TODO(cdn): Modify this class to take a MemoryRegion instead of just | |
| 64 // a raw buffer. This will make it easier to use this on arbitrary | |
| 65 // minidumps without first copying out the code segment. | |
| 66 DisassemblerX86(const uint8_t *bytecode, uint32_t, uint32_t); | |
| 67 ~DisassemblerX86(); | |
| 68 | |
| 69 // This walks to the next instruction in the memory region and | |
| 70 // sets flags based on the type of instruction and previous state | |
| 71 // including any registers marked as bad through setBadRead() | |
| 72 // or setBadWrite(). This method can be called in a loop to | |
| 73 // disassemble until the end of a region. | |
| 74 uint32_t NextInstruction(); | |
| 75 | |
| 76 // Indicates whether the current disassembled instruction was valid. | |
| 77 bool currentInstructionValid() { return instr_valid_; } | |
| 78 | |
| 79 // Returns the current instruction as defined in libdis.h, | |
| 80 // or NULL if the current instruction is not valid. | |
| 81 const libdis::x86_insn_t* currentInstruction() { | |
| 82 return instr_valid_ ? ¤t_instr_ : NULL; | |
| 83 } | |
| 84 | |
| 85 // Returns the type of the current instruction as defined in libdis.h. | |
| 86 libdis::x86_insn_group currentInstructionGroup() { | |
| 87 return current_instr_.group; | |
| 88 } | |
| 89 | |
| 90 // Indicates whether a return instruction has been encountered. | |
| 91 bool endOfBlock() { return end_of_block_; } | |
| 92 | |
| 93 // The flags set so far for the disassembly. | |
| 94 uint16_t flags() { return flags_; } | |
| 95 | |
| 96 // This sets an indicator that the register used to determine | |
| 97 // src or dest for the current instruction is tainted. These can | |
| 98 // be used after examining the current instruction to indicate, | |
| 99 // for example that a bad read or write occurred and the pointer | |
| 100 // stored in the register is currently invalid. | |
| 101 bool setBadRead(); | |
| 102 bool setBadWrite(); | |
| 103 | |
| 104 protected: | |
| 105 const uint8_t *bytecode_; | |
| 106 uint32_t size_; | |
| 107 uint32_t virtual_address_; | |
| 108 uint32_t current_byte_offset_; | |
| 109 uint32_t current_inst_offset_; | |
| 110 | |
| 111 bool instr_valid_; | |
| 112 libdis::x86_insn_t current_instr_; | |
| 113 | |
| 114 // TODO(cdn): Maybe also track an expression's index register. | |
| 115 // ex: mov eax, [ebx + ecx]; ebx is base, ecx is index. | |
| 116 bool register_valid_; | |
| 117 libdis::x86_reg_t bad_register_; | |
| 118 | |
| 119 bool pushed_bad_value_; | |
| 120 bool end_of_block_; | |
| 121 | |
| 122 uint16_t flags_; | |
| 123 }; | |
| 124 | |
| 125 } // namespace google_breakpad | |
| 126 | |
| 127 #endif // GOOGLE_BREAKPAD_PROCESSOR_DISASSEMBLER_X86_H_ |
