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/Support/Disassembler.h" 16 #include "llvm/Config/config.h" 17 #include <cassert> 18 #include <iomanip> 19 #include <sstream> 20 #include <string> 21 22 #if USE_UDIS86 23 #include <udis86.h> 24 #endif 25 26 using namespace llvm; 27 hasDisassembler()28bool llvm::sys::hasDisassembler() 29 { 30 #if defined (__i386__) || defined (__amd64__) || defined (__x86_64__) 31 // We have option to enable udis86 library. 32 # if USE_UDIS86 33 return true; 34 #else 35 return false; 36 #endif 37 #else 38 return false; 39 #endif 40 } 41 disassembleBuffer(uint8_t * start,size_t length,uint64_t pc)42std::string llvm::sys::disassembleBuffer(uint8_t* start, size_t length, 43 uint64_t pc) { 44 #if (defined (__i386__) || defined (__amd64__) || defined (__x86_64__)) \ 45 && USE_UDIS86 46 std::stringstream res; 47 48 unsigned bits; 49 # if defined(__i386__) 50 bits = 32; 51 # else 52 bits = 64; 53 # endif 54 55 ud_t ud_obj; 56 57 ud_init(&ud_obj); 58 ud_set_input_buffer(&ud_obj, start, length); 59 ud_set_mode(&ud_obj, bits); 60 ud_set_pc(&ud_obj, pc); 61 ud_set_syntax(&ud_obj, UD_SYN_ATT); 62 63 res << std::setbase(16) 64 << std::setw(bits/4); 65 66 while (ud_disassemble(&ud_obj)) { 67 res << ud_insn_off(&ud_obj) << ":\t" << ud_insn_asm(&ud_obj) << "\n"; 68 } 69 70 return res.str(); 71 #else 72 return "No disassembler available. See configure help for options.\n"; 73 #endif 74 } 75