1 #!/usr/bin/env python 2 3 import struct 4 import sys 5 import StringIO 6 7 import common_dump 8 9 class Reader: 10 def __init__(self, path): 11 if path == "-": 12 # Snarf all the data so we can seek. 13 self.file = StringIO.StringIO(sys.stdin.read()) 14 else: 15 self.file = open(path, "rb") 16 self.isLSB = None 17 self.is64Bit = None 18 19 def seek(self, pos): 20 self.file.seek(pos) 21 22 def read(self, N): 23 data = self.file.read(N) 24 if len(data) != N: 25 raise ValueError, "Out of data!" 26 return data 27 28 def read8(self): 29 return (ord(self.read(1)), 8) 30 31 def read16(self): 32 return (struct.unpack('><'[self.isLSB] + 'H', self.read(2))[0], 16) 33 34 def read32(self): 35 return (struct.unpack('><'[self.isLSB] + 'I', self.read(4))[0], 32) 36 37 def read64(self): 38 return (struct.unpack('><'[self.isLSB] + 'Q', self.read(8))[0], 64) 39 40 def readWord(self): 41 if self.is64Bit: 42 return self.read64() 43 else: 44 return self.read32() 45 46 class StringTable: 47 def __init__(self, strings): 48 self.string_table = strings 49 50 def __getitem__(self, index): 51 end = self.string_table.index('\x00', index) 52 return self.string_table[index:end] 53 54 class Section: 55 def __init__(self, f): 56 self.sh_name = f.read32() 57 self.sh_type = f.read32() 58 self.sh_flags = f.readWord() 59 self.sh_addr = f.readWord() 60 self.sh_offset = f.readWord() 61 self.sh_size = f.readWord() 62 self.sh_link = f.read32() 63 self.sh_info = f.read32() 64 self.sh_addralign = f.readWord() 65 self.sh_entsize = f.readWord() 66 67 def dump(self, shstrtab, f, strtab, dumpdata): 68 print " (('sh_name', %s)" % common_dump.HexDump(self.sh_name), "# %r" % shstrtab[self.sh_name[0]] 69 print " ('sh_type', %s)" % common_dump.HexDump(self.sh_type) 70 print " ('sh_flags', %s)" % common_dump.HexDump(self.sh_flags) 71 print " ('sh_addr', %s)" % common_dump.HexDump(self.sh_addr) 72 print " ('sh_offset', %s)" % common_dump.HexDump(self.sh_offset) 73 print " ('sh_size', %s)" % common_dump.HexDump(self.sh_size) 74 print " ('sh_link', %s)" % common_dump.HexDump(self.sh_link) 75 print " ('sh_info', %s)" % common_dump.HexDump(self.sh_info) 76 print " ('sh_addralign', %s)" % common_dump.HexDump(self.sh_addralign) 77 print " ('sh_entsize', %s)" % common_dump.HexDump(self.sh_entsize) 78 if self.sh_type[0] == 2: # SHT_SYMTAB 79 print " ('_symbols', [" 80 dumpSymtab(f, self, strtab) 81 print " ])" 82 elif self.sh_type[0] == 4 or self.sh_type[0] == 9: # SHT_RELA / SHT_REL 83 print " ('_relocations', [" 84 dumpRel(f, self, self.sh_type[0] == 4) 85 print " ])" 86 elif dumpdata: 87 f.seek(self.sh_offset[0]) 88 if self.sh_type != 8: # != SHT_NOBITS 89 data = f.read(self.sh_size[0]) 90 print " ('_section_data', '%s')" % common_dump.dataToHex(data) 91 else: 92 print " ('_section_data', '')" 93 print " )," 94 95 def dumpSymtab(f, section, strtab): 96 entries = section.sh_size[0] // section.sh_entsize[0] 97 98 for index in range(entries): 99 f.seek(section.sh_offset[0] + index * section.sh_entsize[0]) 100 print " # Symbol %s" % index 101 name = f.read32() 102 print " (('st_name', %s)" % common_dump.HexDump(name), "# %r" % strtab[name[0]] 103 if not f.is64Bit: 104 print " ('st_value', %s)" % common_dump.HexDump(f.read32()) 105 print " ('st_size', %s)" % common_dump.HexDump(f.read32()) 106 st_info = f.read8()[0] 107 st_bind = (st_info >> 4, 4) 108 st_type = (st_info & 0xf, 4) 109 print " ('st_bind', %s)" % common_dump.HexDump(st_bind) 110 print " ('st_type', %s)" % common_dump.HexDump(st_type) 111 print " ('st_other', %s)" % common_dump.HexDump(f.read8()) 112 print " ('st_shndx', %s)" % common_dump.HexDump(f.read16()) 113 if f.is64Bit: 114 print " ('st_value', %s)" % common_dump.HexDump(f.read64()) 115 print " ('st_size', %s)" % common_dump.HexDump(f.read64()) 116 print " )," 117 118 def dumpRel(f, section, dumprela = False): 119 entries = section.sh_size[0] // section.sh_entsize[0] 120 121 for index in range(entries): 122 f.seek(section.sh_offset[0] + index * section.sh_entsize[0]) 123 print " # Relocation %s" % index 124 print " (('r_offset', %s)" % common_dump.HexDump(f.readWord()) 125 r_info = f.readWord()[0] 126 if f.is64Bit: 127 r_sym = (r_info >> 32, 32) 128 r_type = (r_info & 0xffffffff, 32) 129 else: 130 r_sym = (r_info >> 8, 24) 131 r_type = (r_info & 0xff, 8) 132 print " ('r_sym', %s)" % common_dump.HexDump(r_sym) 133 print " ('r_type', %s)" % common_dump.HexDump(r_type) 134 if dumprela: 135 print " ('r_addend', %s)" % common_dump.HexDump(f.readWord()) 136 print " )," 137 138 def dumpELF(path, opts): 139 f = Reader(path) 140 141 magic = f.read(4) 142 assert magic == '\x7FELF' 143 144 fileclass = f.read8() 145 if fileclass[0] == 1: # ELFCLASS32 146 f.is64Bit = False 147 elif fileclass[0] == 2: # ELFCLASS64 148 f.is64Bit = True 149 else: 150 raise ValueError, "Unknown file class %s" % common_dump.HexDump(fileclass) 151 print "('e_indent[EI_CLASS]', %s)" % common_dump.HexDump(fileclass) 152 153 byteordering = f.read8() 154 if byteordering[0] == 1: # ELFDATA2LSB 155 f.isLSB = True 156 elif byteordering[0] == 2: # ELFDATA2MSB 157 f.isLSB = False 158 else: 159 raise ValueError, "Unknown byte ordering %s" % common_dump.HexDump(byteordering) 160 print "('e_indent[EI_DATA]', %s)" % common_dump.HexDump(byteordering) 161 162 print "('e_indent[EI_VERSION]', %s)" % common_dump.HexDump(f.read8()) 163 print "('e_indent[EI_OSABI]', %s)" % common_dump.HexDump(f.read8()) 164 print "('e_indent[EI_ABIVERSION]', %s)" % common_dump.HexDump(f.read8()) 165 166 f.seek(16) # Seek to end of e_ident. 167 168 print "('e_type', %s)" % common_dump.HexDump(f.read16()) 169 print "('e_machine', %s)" % common_dump.HexDump(f.read16()) 170 print "('e_version', %s)" % common_dump.HexDump(f.read32()) 171 print "('e_entry', %s)" % common_dump.HexDump(f.readWord()) 172 print "('e_phoff', %s)" % common_dump.HexDump(f.readWord()) 173 e_shoff = f.readWord() 174 print "('e_shoff', %s)" % common_dump.HexDump(e_shoff) 175 print "('e_flags', %s)" % common_dump.HexDump(f.read32()) 176 print "('e_ehsize', %s)" % common_dump.HexDump(f.read16()) 177 print "('e_phentsize', %s)" % common_dump.HexDump(f.read16()) 178 print "('e_phnum', %s)" % common_dump.HexDump(f.read16()) 179 e_shentsize = f.read16() 180 print "('e_shentsize', %s)" % common_dump.HexDump(e_shentsize) 181 e_shnum = f.read16() 182 print "('e_shnum', %s)" % common_dump.HexDump(e_shnum) 183 e_shstrndx = f.read16() 184 print "('e_shstrndx', %s)" % common_dump.HexDump(e_shstrndx) 185 186 # Read all section headers 187 sections = [] 188 for index in range(e_shnum[0]): 189 f.seek(e_shoff[0] + index * e_shentsize[0]) 190 s = Section(f) 191 sections.append(s) 192 193 # Read .shstrtab so we can resolve section names 194 f.seek(sections[e_shstrndx[0]].sh_offset[0]) 195 shstrtab = StringTable(f.read(sections[e_shstrndx[0]].sh_size[0])) 196 197 # Get the symbol string table 198 strtab = None 199 for section in sections: 200 if shstrtab[section.sh_name[0]] == ".strtab": 201 f.seek(section.sh_offset[0]) 202 strtab = StringTable(f.read(section.sh_size[0])) 203 break 204 205 print "('_sections', [" 206 for index in range(e_shnum[0]): 207 print " # Section %s" % index 208 sections[index].dump(shstrtab, f, strtab, opts.dumpSectionData) 209 print "])" 210 211 if __name__ == "__main__": 212 from optparse import OptionParser, OptionGroup 213 parser = OptionParser("usage: %prog [options] {files}") 214 parser.add_option("", "--dump-section-data", dest="dumpSectionData", 215 help="Dump the contents of sections", 216 action="store_true", default=False) 217 (opts, args) = parser.parse_args() 218 219 if not args: 220 args.append('-') 221 222 for arg in args: 223 dumpELF(arg, opts) 224
