test/Scripts/elf-dump

   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))
  30
  31     def read16(self):
  32         return struct.unpack('><'[self.isLSB] + 'H', self.read(2))[0]
  33
  34     def read32(self):
  35         return struct.unpack('><'[self.isLSB] + 'I', self.read(4))[0]
  36
  37     def read32S(self):
  38         return struct.unpack('><'[self.isLSB] + 'i', self.read(4))[0]
  39
  40     def read64(self):
  41         return struct.unpack('><'[self.isLSB] + 'Q', self.read(8))[0]
  42
  43     def read64S(self):
  44         return struct.unpack('><'[self.isLSB] + 'q', self.read(8))[0]
  45
  46     def readWord(self):
  47         if self.is64Bit:
  48             return self.read64()
  49         else:
  50             return self.read32()
  51
  52     def readWordS(self):
  53         if self.is64Bit:
  54             return self.read64S()
  55         else:
  56             return self.read32S()
  57
  58 class StringTable:
  59     def __init__(self, strings):
  60        self.string_table = strings
  61
  62     def __getitem__(self, index):
  63        end = self.string_table.index('\x00', index)
  64        return self.string_table[index:end]
  65
  66 class Section:
  67     def __init__(self, f):
  68         self.sh_name = f.read32()
  69         self.sh_type = f.read32()
  70         self.sh_flags = f.readWord()
  71         self.sh_addr = f.readWord()
  72         self.sh_offset = f.readWord()
  73         self.sh_size = f.readWord()
  74         self.sh_link = f.read32()
  75         self.sh_info = f.read32()
  76         self.sh_addralign = f.readWord()
  77         self.sh_entsize = f.readWord()
  78
  79     def dump(self, shstrtab, f, strtab, dumpdata):
  80         print "  (('sh_name', %s)" % common_dump.HexDump(self.sh_name), "# %r" % shstrtab[self.sh_name]
  81         print "   ('sh_type', %s)" % common_dump.HexDump(self.sh_type)
  82         print "   ('sh_flags', %s)" % common_dump.HexDump(self.sh_flags)
  83         print "   ('sh_addr', %s)" % common_dump.HexDump(self.sh_addr)
  84         print "   ('sh_offset', %s)" % common_dump.HexDump(self.sh_offset)
  85         print "   ('sh_size', %s)" % common_dump.HexDump(self.sh_size)
  86         print "   ('sh_link', %s)" % common_dump.HexDump(self.sh_link)
  87         print "   ('sh_info', %s)" % common_dump.HexDump(self.sh_info)
  88         print "   ('sh_addralign', %s)" % common_dump.HexDump(self.sh_addralign)
  89         print "   ('sh_entsize', %s)" % common_dump.HexDump(self.sh_entsize)
  90         if self.sh_type == 2: # SHT_SYMTAB
  91             print "   ('_symbols', ["
  92             dumpSymtab(f, self, strtab)
  93             print "   ])"
  94         elif self.sh_type == 4 or self.sh_type == 9: # SHT_RELA / SHT_REL
  95             print "   ('_relocations', ["
  96             dumpRel(f, self, self.sh_type == 4)
  97             print "   ])"
  98         elif dumpdata:
  99             f.seek(self.sh_offset)
 100             data = f.read(self.sh_size)
 101             print "   ('_section_data', '%s')" % common_dump.dataToHex(data)
 102         print "  ),"
 103
 104 def dumpSymtab(f, section, strtab):
 105     entries = section.sh_size // section.sh_entsize
 106
 107     for index in range(entries):
 108         f.seek(section.sh_offset + index * section.sh_entsize)
 109         print "    # Symbol %s" % common_dump.HexDump(index)
 110         name = f.read32()
 111         print "    (('st_name', %s)" % common_dump.HexDump(name), "# %r" % strtab[name]
 112         if not f.is64Bit:
 113             print "     ('st_value', %s)" % common_dump.HexDump(f.read32())
 114             print "     ('st_size', %s)" % common_dump.HexDump(f.read32())
 115         st_info = f.read8()
 116         print "     ('st_bind', %s)" % common_dump.HexDump((st_info >> 4))
 117         print "     ('st_type', %s)" % common_dump.HexDump((st_info & 0xf))
 118         print "     ('st_other', %s)" % common_dump.HexDump(f.read8())
 119         print "     ('st_shndx', %s)" % common_dump.HexDump(f.read16())
 120         if f.is64Bit:
 121             print "     ('st_value', %s)" % common_dump.HexDump(f.read64())
 122             print "     ('st_size', %s)" % common_dump.HexDump(f.read64())
 123         print "    ),"
 124
 125 def dumpRel(f, section, dumprela = False):
 126     entries = section.sh_size // section.sh_entsize
 127
 128     for index in range(entries):
 129         f.seek(section.sh_offset + index * section.sh_entsize)
 130         print "    # Relocation %s" % common_dump.HexDump(index)
 131         print "    (('r_offset', %s)" % common_dump.HexDump(f.readWord())
 132         r_info = f.readWord()
 133         if f.is64Bit:
 134             print "     ('r_sym', %s)" % common_dump.HexDump((r_info >> 32))
 135             print "     ('r_type', %s)" % common_dump.HexDump((r_info & 0xffffffff))
 136         else:
 137             print "     ('r_sym', %s)" % common_dump.HexDump((r_info >> 8))
 138             print "     ('r_type', %s)" % common_dump.HexDump((r_info & 0xff))
 139         if dumprela:
 140             print "     ('r_addend', %s)" % common_dump.HexDump(f.readWordS())
 141         print "    ),"
 142
 143 def dumpELF(path, opts):
 144     f = Reader(path)
 145
 146     magic = f.read(4)
 147     assert magic == '\x7FELF'
 148
 149     fileclass = f.read8()
 150     if fileclass == 1: # ELFCLASS32
 151         f.is64Bit = False
 152     elif fileclass == 2: # ELFCLASS64
 153         f.is64Bit = True
 154     else:
 155         raise ValueError, "Unknown file class %s" % common_dump.HexDump(fileclass)
 156     print "('e_indent[EI_CLASS]', %s)" % common_dump.HexDump(fileclass)
 157
 158     byteordering = f.read8()
 159     if byteordering == 1: # ELFDATA2LSB
 160         f.isLSB = True
 161     elif byteordering == 2: # ELFDATA2MSB
 162         f.isLSB = False
 163     else:
 164         raise ValueError, "Unknown byte ordering %s" % common_dump.HexDump(byteordering)
 165     print "('e_indent[EI_DATA]', %s)" % common_dump.HexDump(byteordering)
 166
 167     print "('e_indent[EI_VERSION]', %s)" % common_dump.HexDump(f.read8())
 168     print "('e_indent[EI_OSABI]', %s)" % common_dump.HexDump(f.read8())
 169     print "('e_indent[EI_ABIVERSION]', %s)" % common_dump.HexDump(f.read8())
 170
 171     f.seek(16) # Seek to end of e_ident.
 172
 173     print "('e_type', %s)" % common_dump.HexDump(f.read16())
 174     print "('e_machine', %s)" % common_dump.HexDump(f.read16())
 175     print "('e_version', %s)" % common_dump.HexDump(f.read32())
 176     print "('e_entry', %s)" % common_dump.HexDump(f.readWord())
 177     print "('e_phoff', %s)" % common_dump.HexDump(f.readWord())
 178     e_shoff = f.readWord()
 179     print "('e_shoff', %s)" % common_dump.HexDump(e_shoff)
 180     print "('e_flags', %s)" % common_dump.HexDump(f.read32())
 181     print "('e_ehsize', %s)" % common_dump.HexDump(f.read16())
 182     print "('e_phentsize', %s)" % common_dump.HexDump(f.read16())
 183     print "('e_phnum', %s)" % common_dump.HexDump(f.read16())
 184     e_shentsize = f.read16()
 185     print "('e_shentsize', %s)" % common_dump.HexDump(e_shentsize)
 186     e_shnum = f.read16()
 187     print "('e_shnum', %s)" % common_dump.HexDump(e_shnum)
 188     e_shstrndx = f.read16()
 189     print "('e_shstrndx', %s)" % common_dump.HexDump(e_shstrndx)
 190
 191     # Read all section headers
 192     sections = []
 193     for index in range(e_shnum):
 194         f.seek(e_shoff + index * e_shentsize)
 195         s = Section(f)
 196         sections.append(s)
 197
 198     # Read .shstrtab so we can resolve section names
 199     f.seek(sections[e_shstrndx].sh_offset)
 200     shstrtab = StringTable(f.read(sections[e_shstrndx].sh_size))
 201
 202     # Get the symbol string table
 203     strtab = None
 204     for section in sections:
 205         if shstrtab[section.sh_name] == ".strtab":
 206             f.seek(section.sh_offset)
 207             strtab = StringTable(f.read(section.sh_size))
 208             break
 209
 210     print "('_sections', ["
 211     for index in range(e_shnum):
 212         print "  # Section %s" % common_dump.HexDump(index)
 213         sections[index].dump(shstrtab, f, strtab, opts.dumpSectionData)
 214     print "])"
 215
 216 if __name__ == "__main__":
 217     from optparse import OptionParser, OptionGroup
 218     parser = OptionParser("usage: %prog [options] {files}")
 219     parser.add_option("", "--dump-section-data", dest="dumpSectionData",
 220                       help="Dump the contents of sections",
 221                       action="store_true", default=False)
 222     (opts, args) = parser.parse_args()
 223
 224     if not args:
 225         args.append('-')
 226
 227     for arg in args:
 228         dumpELF(arg, opts)