1 //===- lib/Support/Disassembler.cpp -----------------------------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file implements the necessary glue to call external disassembler 11 // libraries. 12 // 13 //===----------------------------------------------------------------------===// 14 15 #include "llvm/Config/config.h" 16 #include "llvm/Support/Disassembler.h" 17 18 #include <cassert> 19 #include <iomanip> 20 #include <string> 21 #include <sstream> 22 23 #if USE_UDIS86 24 #include <udis86.h> 25 #endif 26 27 using namespace llvm; 28 hasDisassembler()29 bool llvm::sys::hasDisassembler() 30 { 31 #if defined (__i386__) || defined (__amd64__) || defined (__x86_64__) 32 // We have option to enable udis86 library. 33 # if USE_UDIS86 34 return true; 35 #else 36 return false; 37 #endif 38 #else 39 return false; 40 #endif 41 } 42 disassembleBuffer(uint8_t * start,size_t length,uint64_t pc)43 std::string llvm::sys::disassembleBuffer(uint8_t* start, size_t length, 44 uint64_t pc) { 45 std::stringstream res; 46 47 #if (defined (__i386__) || defined (__amd64__) || defined (__x86_64__)) \ 48 && USE_UDIS86 49 unsigned bits; 50 # if defined(__i386__) 51 bits = 32; 52 # else 53 bits = 64; 54 # endif 55 56 ud_t ud_obj; 57 58 ud_init(&ud_obj); 59 ud_set_input_buffer(&ud_obj, start, length); 60 ud_set_mode(&ud_obj, bits); 61 ud_set_pc(&ud_obj, pc); 62 ud_set_syntax(&ud_obj, UD_SYN_ATT); 63 64 res << std::setbase(16) 65 << std::setw(bits/4); 66 67 while (ud_disassemble(&ud_obj)) { 68 res << ud_insn_off(&ud_obj) << ":\t" << ud_insn_asm(&ud_obj) << "\n"; 69 } 70 #else 71 res << "No disassembler available. See configure help for options.\n"; 72 #endif 73 74 return res.str(); 75 } 76