1  /*
 2   * Copyright (C) 2012-2018 Apple Inc. All rights reserved.
 3   *
 4   * Redistribution and use in source and binary forms, with or without
 5   * modification, are permitted provided that the following conditions
 6   * are met:
 7   * 1. Redistributions of source code must retain the above copyright
 8   *    notice, this list of conditions and the following disclaimer.
 9   * 2. Redistributions in binary form must reproduce the above copyright
10   *    notice, this list of conditions and the following disclaimer in the
11   *    documentation and/or other materials provided with the distribution.
12   *
13   * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14   * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16   * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
17   * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18   * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19   * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20   * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21   * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
24   */
25  
26  #include "config.h"
27  #include "UDis86Disassembler.h"
28  
29  #if ENABLE(UDIS86)
30  
31  #include "MacroAssemblerCodeRef.h"
32  #include "udis86.h"
33  
34  namespace JSC {
35  
36  bool tryToDisassembleWithUDis86(const MacroAssemblerCodePtr<DisassemblyPtrTag>& codePtr, size_t size, const char* prefix, PrintStream& out)
37  {
38      ud_t disassembler;
39      ud_init(&disassembler);
40      ud_set_input_buffer(&disassembler, codePtr.untaggedExecutableAddress<unsigned char*>(), size);
41  #if CPU(X86_64)
42      ud_set_mode(&disassembler, 64);
43  #else
44      ud_set_mode(&disassembler, 32);
45  #endif
46      ud_set_pc(&disassembler, codePtr.untaggedExecutableAddress<uintptr_t>());
47      ud_set_syntax(&disassembler, UD_SYN_ATT);
48      
49      uint64_t currentPC = disassembler.pc;
50      while (ud_disassemble(&disassembler)) {
51          char pcString[20];
52          snprintf(pcString, sizeof(pcString), "0x%" PRIxPTR, static_cast<uintptr_t>(currentPC));
53          out.printf("%s%16s: %s\n", prefix, pcString, ud_insn_asm(&disassembler));
54          currentPC = disassembler.pc;
55      }
56      
57      return true;
58  }
59  
60  } // namespace JSC
61  
62  #endif // ENABLE(UDIS86)
63