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224 lines
8.1 KiB
Python
Executable File
224 lines
8.1 KiB
Python
Executable File
#!/usr/bin/env python
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import struct
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import sys
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import StringIO
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import common_dump
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class Reader:
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def __init__(self, path):
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if path == "-":
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# Snarf all the data so we can seek.
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self.file = StringIO.StringIO(sys.stdin.read())
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else:
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self.file = open(path, "rb")
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self.isLSB = None
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self.is64Bit = None
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def seek(self, pos):
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self.file.seek(pos)
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def read(self, N):
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data = self.file.read(N)
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if len(data) != N:
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raise ValueError, "Out of data!"
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return data
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def read8(self):
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return (ord(self.read(1)), 8)
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def read16(self):
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return (struct.unpack('><'[self.isLSB] + 'H', self.read(2))[0], 16)
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def read32(self):
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return (struct.unpack('><'[self.isLSB] + 'I', self.read(4))[0], 32)
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def read64(self):
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return (struct.unpack('><'[self.isLSB] + 'Q', self.read(8))[0], 64)
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def readWord(self):
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if self.is64Bit:
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return self.read64()
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else:
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return self.read32()
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class StringTable:
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def __init__(self, strings):
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self.string_table = strings
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def __getitem__(self, index):
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end = self.string_table.index('\x00', index)
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return self.string_table[index:end]
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class Section:
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def __init__(self, f):
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self.sh_name = f.read32()
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self.sh_type = f.read32()
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self.sh_flags = f.readWord()
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self.sh_addr = f.readWord()
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self.sh_offset = f.readWord()
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self.sh_size = f.readWord()
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self.sh_link = f.read32()
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self.sh_info = f.read32()
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self.sh_addralign = f.readWord()
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self.sh_entsize = f.readWord()
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def dump(self, shstrtab, f, strtab, dumpdata):
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print " (('sh_name', %s)" % common_dump.HexDump(self.sh_name), "# %r" % shstrtab[self.sh_name[0]]
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print " ('sh_type', %s)" % common_dump.HexDump(self.sh_type)
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print " ('sh_flags', %s)" % common_dump.HexDump(self.sh_flags)
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print " ('sh_addr', %s)" % common_dump.HexDump(self.sh_addr)
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print " ('sh_offset', %s)" % common_dump.HexDump(self.sh_offset)
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print " ('sh_size', %s)" % common_dump.HexDump(self.sh_size)
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print " ('sh_link', %s)" % common_dump.HexDump(self.sh_link)
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print " ('sh_info', %s)" % common_dump.HexDump(self.sh_info)
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print " ('sh_addralign', %s)" % common_dump.HexDump(self.sh_addralign)
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print " ('sh_entsize', %s)" % common_dump.HexDump(self.sh_entsize)
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if self.sh_type[0] == 2: # SHT_SYMTAB
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print " ('_symbols', ["
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dumpSymtab(f, self, strtab)
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print " ])"
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elif self.sh_type[0] == 4 or self.sh_type[0] == 9: # SHT_RELA / SHT_REL
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print " ('_relocations', ["
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dumpRel(f, self, self.sh_type[0] == 4)
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print " ])"
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elif dumpdata:
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f.seek(self.sh_offset[0])
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if self.sh_type != 8: # != SHT_NOBITS
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data = f.read(self.sh_size[0])
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print " ('_section_data', '%s')" % common_dump.dataToHex(data)
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else:
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print " ('_section_data', '')"
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print " ),"
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def dumpSymtab(f, section, strtab):
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entries = section.sh_size[0] // section.sh_entsize[0]
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for index in range(entries):
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f.seek(section.sh_offset[0] + index * section.sh_entsize[0])
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print " # Symbol %s" % index
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name = f.read32()
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print " (('st_name', %s)" % common_dump.HexDump(name), "# %r" % strtab[name[0]]
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if not f.is64Bit:
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print " ('st_value', %s)" % common_dump.HexDump(f.read32())
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print " ('st_size', %s)" % common_dump.HexDump(f.read32())
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st_info = f.read8()[0]
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st_bind = (st_info >> 4, 4)
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st_type = (st_info & 0xf, 4)
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print " ('st_bind', %s)" % common_dump.HexDump(st_bind)
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print " ('st_type', %s)" % common_dump.HexDump(st_type)
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print " ('st_other', %s)" % common_dump.HexDump(f.read8())
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print " ('st_shndx', %s)" % common_dump.HexDump(f.read16())
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if f.is64Bit:
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print " ('st_value', %s)" % common_dump.HexDump(f.read64())
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print " ('st_size', %s)" % common_dump.HexDump(f.read64())
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print " ),"
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def dumpRel(f, section, dumprela = False):
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entries = section.sh_size[0] // section.sh_entsize[0]
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for index in range(entries):
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f.seek(section.sh_offset[0] + index * section.sh_entsize[0])
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print " # Relocation %s" % index
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print " (('r_offset', %s)" % common_dump.HexDump(f.readWord())
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r_info = f.readWord()[0]
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if f.is64Bit:
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r_sym = (r_info >> 32, 32)
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r_type = (r_info & 0xffffffff, 32)
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else:
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r_sym = (r_info >> 8, 24)
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r_type = (r_info & 0xff, 8)
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print " ('r_sym', %s)" % common_dump.HexDump(r_sym)
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print " ('r_type', %s)" % common_dump.HexDump(r_type)
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if dumprela:
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print " ('r_addend', %s)" % common_dump.HexDump(f.readWord())
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print " ),"
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def dumpELF(path, opts):
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f = Reader(path)
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magic = f.read(4)
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assert magic == '\x7FELF'
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fileclass = f.read8()
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if fileclass[0] == 1: # ELFCLASS32
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f.is64Bit = False
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elif fileclass[0] == 2: # ELFCLASS64
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f.is64Bit = True
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else:
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raise ValueError, "Unknown file class %s" % common_dump.HexDump(fileclass)
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print "('e_indent[EI_CLASS]', %s)" % common_dump.HexDump(fileclass)
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byteordering = f.read8()
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if byteordering[0] == 1: # ELFDATA2LSB
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f.isLSB = True
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elif byteordering[0] == 2: # ELFDATA2MSB
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f.isLSB = False
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else:
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raise ValueError, "Unknown byte ordering %s" % common_dump.HexDump(byteordering)
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print "('e_indent[EI_DATA]', %s)" % common_dump.HexDump(byteordering)
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print "('e_indent[EI_VERSION]', %s)" % common_dump.HexDump(f.read8())
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print "('e_indent[EI_OSABI]', %s)" % common_dump.HexDump(f.read8())
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print "('e_indent[EI_ABIVERSION]', %s)" % common_dump.HexDump(f.read8())
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f.seek(16) # Seek to end of e_ident.
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print "('e_type', %s)" % common_dump.HexDump(f.read16())
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print "('e_machine', %s)" % common_dump.HexDump(f.read16())
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print "('e_version', %s)" % common_dump.HexDump(f.read32())
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print "('e_entry', %s)" % common_dump.HexDump(f.readWord())
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print "('e_phoff', %s)" % common_dump.HexDump(f.readWord())
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e_shoff = f.readWord()
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print "('e_shoff', %s)" % common_dump.HexDump(e_shoff)
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print "('e_flags', %s)" % common_dump.HexDump(f.read32())
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print "('e_ehsize', %s)" % common_dump.HexDump(f.read16())
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print "('e_phentsize', %s)" % common_dump.HexDump(f.read16())
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print "('e_phnum', %s)" % common_dump.HexDump(f.read16())
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e_shentsize = f.read16()
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print "('e_shentsize', %s)" % common_dump.HexDump(e_shentsize)
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e_shnum = f.read16()
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print "('e_shnum', %s)" % common_dump.HexDump(e_shnum)
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e_shstrndx = f.read16()
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print "('e_shstrndx', %s)" % common_dump.HexDump(e_shstrndx)
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# Read all section headers
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sections = []
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for index in range(e_shnum[0]):
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f.seek(e_shoff[0] + index * e_shentsize[0])
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s = Section(f)
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sections.append(s)
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# Read .shstrtab so we can resolve section names
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f.seek(sections[e_shstrndx[0]].sh_offset[0])
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shstrtab = StringTable(f.read(sections[e_shstrndx[0]].sh_size[0]))
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# Get the symbol string table
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strtab = None
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for section in sections:
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if shstrtab[section.sh_name[0]] == ".strtab":
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f.seek(section.sh_offset[0])
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strtab = StringTable(f.read(section.sh_size[0]))
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break
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print "('_sections', ["
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for index in range(e_shnum[0]):
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print " # Section %s" % index
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sections[index].dump(shstrtab, f, strtab, opts.dumpSectionData)
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print "])"
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if __name__ == "__main__":
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from optparse import OptionParser, OptionGroup
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parser = OptionParser("usage: %prog [options] {files}")
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parser.add_option("", "--dump-section-data", dest="dumpSectionData",
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help="Dump the contents of sections",
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action="store_true", default=False)
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(opts, args) = parser.parse_args()
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if not args:
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args.append('-')
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for arg in args:
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dumpELF(arg, opts)
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