The Tor Browser: toolkit/crashreporter/google-breakpad/src/processor/disassembler

toolkit/crashreporter/google-breakpad/src/processor/disassembler_x86.h@6474c204b198 (annotated)

toolkit/crashreporter/google-breakpad/src/processor/disassembler_x86.h

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 // All rights reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 // notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 // copyright notice, this list of conditions and the following disclaimer
 // in the documentation and/or other materials provided with the
 // distribution.
 //     * Neither the name of Google Inc. nor the names of its
 // contributors may be used to endorse or promote products derived from
 // this software without specific prior written permission.
 //
 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 // disassembler_x86.h: Basic x86 bytecode disassembler
 //
 // Provides a simple disassembler which wraps libdisasm. This allows simple
 // tests to be run against bytecode to test for various properties.
 //
 // Author: Cris Neckar
 #ifndef GOOGLE_BREAKPAD_PROCESSOR_DISASSEMBLER_X86_H_
 #define GOOGLE_BREAKPAD_PROCESSOR_DISASSEMBLER_X86_H_
 #include <stddef.h>
 #include <sys/types.h>
 #include "google_breakpad/common/breakpad_types.h"
 namespace libdis {
 #include "third_party/libdisasm/libdis.h"
 }
 namespace google_breakpad {
 enum {
   DISX86_NONE =                 0x0,
   DISX86_BAD_BRANCH_TARGET =    0x1,
   DISX86_BAD_ARGUMENT_PASSED =  0x2,
   DISX86_BAD_WRITE =            0x4,
   DISX86_BAD_BLOCK_WRITE =      0x8,
   DISX86_BAD_READ =             0x10,
   DISX86_BAD_BLOCK_READ =       0x20,
   DISX86_BAD_COMPARISON =       0x40
 };
 class DisassemblerX86 {
   public:
     // TODO(cdn): Modify this class to take a MemoryRegion instead of just
     // a raw buffer. This will make it easier to use this on arbitrary
     // minidumps without first copying out the code segment.
     DisassemblerX86(const uint8_t *bytecode, uint32_t, uint32_t);
     ~DisassemblerX86();
     // This walks to the next instruction in the memory region and
     // sets flags based on the type of instruction and previous state
     // including any registers marked as bad through setBadRead()
     // or setBadWrite(). This method can be called in a loop to
     // disassemble until the end of a region.
     uint32_t NextInstruction();
     // Indicates whether the current disassembled instruction was valid.
     bool currentInstructionValid() { return instr_valid_; }
     // Returns the current instruction as defined in libdis.h,
     // or NULL if the current instruction is not valid.
     const libdis::x86_insn_t* currentInstruction() {
       return instr_valid_ ? &current_instr_ : NULL;
     }
     // Returns the type of the current instruction as defined in libdis.h.
     libdis::x86_insn_group currentInstructionGroup() {
       return current_instr_.group;
     }
     // Indicates whether a return instruction has been encountered.
     bool endOfBlock() { return end_of_block_; }
     // The flags set so far for the disassembly.
     uint16_t flags() { return flags_; }
     // This sets an indicator that the register used to determine
     // src or dest for the current instruction is tainted. These can
     // be used after examining the current instruction to indicate,
     // for example that a bad read or write occurred and the pointer
     // stored in the register is currently invalid.
     bool setBadRead();
     bool setBadWrite();
   protected:
     const uint8_t *bytecode_;
     uint32_t size_;
     uint32_t virtual_address_;
     uint32_t current_byte_offset_;
     uint32_t current_inst_offset_;
     bool instr_valid_;
     libdis::x86_insn_t current_instr_;
     // TODO(cdn): Maybe also track an expression's index register.
     // ex: mov eax, [ebx + ecx]; ebx is base, ecx is index.
     bool register_valid_;
     libdis::x86_reg_t bad_register_;
     bool pushed_bad_value_;
     bool end_of_block_;
     uint16_t flags_;
 };
 }  // namespace google_breakpad
 #endif  // GOOGLE_BREAKPAD_PROCESSOR_DISASSEMBLER_X86_H_

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toolkit/crashreporter/google-breakpad/src/processor/disassembler_x86.h@6474c204b198 (annotated)

toolkit/crashreporter/google-breakpad/src/processor/disassembler_x86.h