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glibc/scripts/glibcelf.py

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#!/usr/bin/python3
# ELF support functionality for Python.
# Copyright (C) 2022 Free Software Foundation, Inc.
# This file is part of the GNU C Library.
#
# The GNU C Library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# The GNU C Library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with the GNU C Library; if not, see
# <https://www.gnu.org/licenses/>.
"""Basic ELF parser.
Use Image.readfile(path) to read an ELF file into memory and begin
parsing it.
"""
import collections
import enum
import struct
if not hasattr(enum, 'IntFlag'):
import sys
sys.stdout.write(
'warning: glibcelf.py needs Python 3.6 for enum support\n')
sys.exit(77)
class _OpenIntEnum(enum.IntEnum):
"""Integer enumeration that supports arbitrary int values."""
@classmethod
def _missing_(cls, value):
# See enum.IntFlag._create_pseudo_member_. This allows
# creating of enum constants with arbitrary integer values.
pseudo_member = int.__new__(cls, value)
pseudo_member._name_ = None
pseudo_member._value_ = value
return pseudo_member
def __repr__(self):
name = self._name_
if name is not None:
# The names have prefixes like SHT_, implying their type.
return name
return '{}({})'.format(self.__class__.__name__, self._value_)
def __str__(self):
name = self._name_
if name is not None:
return name
return str(self._value_)
class ElfClass(_OpenIntEnum):
"""ELF word size. Type of EI_CLASS values."""
ELFCLASSNONE = 0
ELFCLASS32 = 1
ELFCLASS64 = 2
class ElfData(_OpenIntEnum):
"""ELF endianess. Type of EI_DATA values."""
ELFDATANONE = 0
ELFDATA2LSB = 1
ELFDATA2MSB = 2
class Machine(_OpenIntEnum):
"""ELF machine type. Type of values in Ehdr.e_machine field."""
EM_NONE = 0
EM_M32 = 1
EM_SPARC = 2
EM_386 = 3
EM_68K = 4
EM_88K = 5
EM_IAMCU = 6
EM_860 = 7
EM_MIPS = 8
EM_S370 = 9
EM_MIPS_RS3_LE = 10
EM_PARISC = 15
EM_VPP500 = 17
EM_SPARC32PLUS = 18
EM_960 = 19
EM_PPC = 20
EM_PPC64 = 21
EM_S390 = 22
EM_SPU = 23
EM_V800 = 36
EM_FR20 = 37
EM_RH32 = 38
EM_RCE = 39
EM_ARM = 40
EM_FAKE_ALPHA = 41
EM_SH = 42
EM_SPARCV9 = 43
EM_TRICORE = 44
EM_ARC = 45
EM_H8_300 = 46
EM_H8_300H = 47
EM_H8S = 48
EM_H8_500 = 49
EM_IA_64 = 50
EM_MIPS_X = 51
EM_COLDFIRE = 52
EM_68HC12 = 53
EM_MMA = 54
EM_PCP = 55
EM_NCPU = 56
EM_NDR1 = 57
EM_STARCORE = 58
EM_ME16 = 59
EM_ST100 = 60
EM_TINYJ = 61
EM_X86_64 = 62
EM_PDSP = 63
EM_PDP10 = 64
EM_PDP11 = 65
EM_FX66 = 66
EM_ST9PLUS = 67
EM_ST7 = 68
EM_68HC16 = 69
EM_68HC11 = 70
EM_68HC08 = 71
EM_68HC05 = 72
EM_SVX = 73
EM_ST19 = 74
EM_VAX = 75
EM_CRIS = 76
EM_JAVELIN = 77
EM_FIREPATH = 78
EM_ZSP = 79
EM_MMIX = 80
EM_HUANY = 81
EM_PRISM = 82
EM_AVR = 83
EM_FR30 = 84
EM_D10V = 85
EM_D30V = 86
EM_V850 = 87
EM_M32R = 88
EM_MN10300 = 89
EM_MN10200 = 90
EM_PJ = 91
EM_OPENRISC = 92
EM_ARC_COMPACT = 93
EM_XTENSA = 94
EM_VIDEOCORE = 95
EM_TMM_GPP = 96
EM_NS32K = 97
EM_TPC = 98
EM_SNP1K = 99
EM_ST200 = 100
EM_IP2K = 101
EM_MAX = 102
EM_CR = 103
EM_F2MC16 = 104
EM_MSP430 = 105
EM_BLACKFIN = 106
EM_SE_C33 = 107
EM_SEP = 108
EM_ARCA = 109
EM_UNICORE = 110
EM_EXCESS = 111
EM_DXP = 112
EM_ALTERA_NIOS2 = 113
EM_CRX = 114
EM_XGATE = 115
EM_C166 = 116
EM_M16C = 117
EM_DSPIC30F = 118
EM_CE = 119
EM_M32C = 120
EM_TSK3000 = 131
EM_RS08 = 132
EM_SHARC = 133
EM_ECOG2 = 134
EM_SCORE7 = 135
EM_DSP24 = 136
EM_VIDEOCORE3 = 137
EM_LATTICEMICO32 = 138
EM_SE_C17 = 139
EM_TI_C6000 = 140
EM_TI_C2000 = 141
EM_TI_C5500 = 142
EM_TI_ARP32 = 143
EM_TI_PRU = 144
EM_MMDSP_PLUS = 160
EM_CYPRESS_M8C = 161
EM_R32C = 162
EM_TRIMEDIA = 163
EM_QDSP6 = 164
EM_8051 = 165
EM_STXP7X = 166
EM_NDS32 = 167
EM_ECOG1X = 168
EM_MAXQ30 = 169
EM_XIMO16 = 170
EM_MANIK = 171
EM_CRAYNV2 = 172
EM_RX = 173
EM_METAG = 174
EM_MCST_ELBRUS = 175
EM_ECOG16 = 176
EM_CR16 = 177
EM_ETPU = 178
EM_SLE9X = 179
EM_L10M = 180
EM_K10M = 181
EM_AARCH64 = 183
EM_AVR32 = 185
EM_STM8 = 186
EM_TILE64 = 187
EM_TILEPRO = 188
EM_MICROBLAZE = 189
EM_CUDA = 190
EM_TILEGX = 191
EM_CLOUDSHIELD = 192
EM_COREA_1ST = 193
EM_COREA_2ND = 194
EM_ARCV2 = 195
EM_OPEN8 = 196
EM_RL78 = 197
EM_VIDEOCORE5 = 198
EM_78KOR = 199
EM_56800EX = 200
EM_BA1 = 201
EM_BA2 = 202
EM_XCORE = 203
EM_MCHP_PIC = 204
EM_INTELGT = 205
EM_KM32 = 210
EM_KMX32 = 211
EM_EMX16 = 212
EM_EMX8 = 213
EM_KVARC = 214
EM_CDP = 215
EM_COGE = 216
EM_COOL = 217
EM_NORC = 218
EM_CSR_KALIMBA = 219
EM_Z80 = 220
EM_VISIUM = 221
EM_FT32 = 222
EM_MOXIE = 223
EM_AMDGPU = 224
EM_RISCV = 243
EM_BPF = 247
EM_CSKY = 252
EM_NUM = 253
EM_ALPHA = 0x9026
class Et(_OpenIntEnum):
"""ELF file type. Type of ET_* values and the Ehdr.e_type field."""
ET_NONE = 0
ET_REL = 1
ET_EXEC = 2
ET_DYN = 3
ET_CORE = 4
class Shn(_OpenIntEnum):
"""ELF reserved section indices."""
SHN_UNDEF = 0
SHN_BEFORE = 0xff00
SHN_AFTER = 0xff01
SHN_ABS = 0xfff1
SHN_COMMON = 0xfff2
SHN_XINDEX = 0xffff
class ShnMIPS(enum.Enum):
"""Supplemental SHN_* constants for EM_MIPS."""
SHN_MIPS_ACOMMON = 0xff00
SHN_MIPS_TEXT = 0xff01
SHN_MIPS_DATA = 0xff02
SHN_MIPS_SCOMMON = 0xff03
SHN_MIPS_SUNDEFINED = 0xff04
class ShnPARISC(enum.Enum):
"""Supplemental SHN_* constants for EM_PARISC."""
SHN_PARISC_ANSI_COMMON = 0xff00
SHN_PARISC_HUGE_COMMON = 0xff01
class Sht(_OpenIntEnum):
"""ELF section types. Type of SHT_* values."""
SHT_NULL = 0
SHT_PROGBITS = 1
SHT_SYMTAB = 2
SHT_STRTAB = 3
SHT_RELA = 4
SHT_HASH = 5
SHT_DYNAMIC = 6
SHT_NOTE = 7
SHT_NOBITS = 8
SHT_REL = 9
SHT_SHLIB = 10
SHT_DYNSYM = 11
SHT_INIT_ARRAY = 14
SHT_FINI_ARRAY = 15
SHT_PREINIT_ARRAY = 16
SHT_GROUP = 17
SHT_SYMTAB_SHNDX = 18
SHT_RELR = 19
SHT_GNU_ATTRIBUTES = 0x6ffffff5
SHT_GNU_HASH = 0x6ffffff6
SHT_GNU_LIBLIST = 0x6ffffff7
SHT_CHECKSUM = 0x6ffffff8
SHT_SUNW_move = 0x6ffffffa
SHT_SUNW_COMDAT = 0x6ffffffb
SHT_SUNW_syminfo = 0x6ffffffc
SHT_GNU_verdef = 0x6ffffffd
SHT_GNU_verneed = 0x6ffffffe
SHT_GNU_versym = 0x6fffffff
class ShtALPHA(enum.Enum):
"""Supplemental SHT_* constants for EM_ALPHA."""
SHT_ALPHA_DEBUG = 0x70000001
SHT_ALPHA_REGINFO = 0x70000002
class ShtARM(enum.Enum):
"""Supplemental SHT_* constants for EM_ARM."""
SHT_ARM_EXIDX = 0x70000001
SHT_ARM_PREEMPTMAP = 0x70000002
SHT_ARM_ATTRIBUTES = 0x70000003
class ShtCSKY(enum.Enum):
"""Supplemental SHT_* constants for EM_CSKY."""
SHT_CSKY_ATTRIBUTES = 0x70000001
class ShtIA_64(enum.Enum):
"""Supplemental SHT_* constants for EM_IA_64."""
SHT_IA_64_EXT = 0x70000000
SHT_IA_64_UNWIND = 0x70000001
class ShtMIPS(enum.Enum):
"""Supplemental SHT_* constants for EM_MIPS."""
SHT_MIPS_LIBLIST = 0x70000000
SHT_MIPS_MSYM = 0x70000001
SHT_MIPS_CONFLICT = 0x70000002
SHT_MIPS_GPTAB = 0x70000003
SHT_MIPS_UCODE = 0x70000004
SHT_MIPS_DEBUG = 0x70000005
SHT_MIPS_REGINFO = 0x70000006
SHT_MIPS_PACKAGE = 0x70000007
SHT_MIPS_PACKSYM = 0x70000008
SHT_MIPS_RELD = 0x70000009
SHT_MIPS_IFACE = 0x7000000b
SHT_MIPS_CONTENT = 0x7000000c
SHT_MIPS_OPTIONS = 0x7000000d
SHT_MIPS_SHDR = 0x70000010
SHT_MIPS_FDESC = 0x70000011
SHT_MIPS_EXTSYM = 0x70000012
SHT_MIPS_DENSE = 0x70000013
SHT_MIPS_PDESC = 0x70000014
SHT_MIPS_LOCSYM = 0x70000015
SHT_MIPS_AUXSYM = 0x70000016
SHT_MIPS_OPTSYM = 0x70000017
SHT_MIPS_LOCSTR = 0x70000018
SHT_MIPS_LINE = 0x70000019
SHT_MIPS_RFDESC = 0x7000001a
SHT_MIPS_DELTASYM = 0x7000001b
SHT_MIPS_DELTAINST = 0x7000001c
SHT_MIPS_DELTACLASS = 0x7000001d
SHT_MIPS_DWARF = 0x7000001e
SHT_MIPS_DELTADECL = 0x7000001f
SHT_MIPS_SYMBOL_LIB = 0x70000020
SHT_MIPS_EVENTS = 0x70000021
SHT_MIPS_TRANSLATE = 0x70000022
SHT_MIPS_PIXIE = 0x70000023
SHT_MIPS_XLATE = 0x70000024
SHT_MIPS_XLATE_DEBUG = 0x70000025
SHT_MIPS_WHIRL = 0x70000026
SHT_MIPS_EH_REGION = 0x70000027
SHT_MIPS_XLATE_OLD = 0x70000028
SHT_MIPS_PDR_EXCEPTION = 0x70000029
SHT_MIPS_XHASH = 0x7000002b
class ShtPARISC(enum.Enum):
"""Supplemental SHT_* constants for EM_PARISC."""
SHT_PARISC_EXT = 0x70000000
SHT_PARISC_UNWIND = 0x70000001
SHT_PARISC_DOC = 0x70000002
class Pf(enum.IntFlag):
"""Program header flags. Type of Phdr.p_flags values."""
PF_X = 1
PF_W = 2
PF_R = 4
class PfARM(enum.IntFlag):
"""Supplemental PF_* flags for EM_ARM."""
PF_ARM_SB = 0x10000000
PF_ARM_PI = 0x20000000
PF_ARM_ABS = 0x40000000
class PfPARISC(enum.IntFlag):
"""Supplemental PF_* flags for EM_PARISC."""
PF_HP_PAGE_SIZE = 0x00100000
PF_HP_FAR_SHARED = 0x00200000
PF_HP_NEAR_SHARED = 0x00400000
PF_HP_CODE = 0x01000000
PF_HP_MODIFY = 0x02000000
PF_HP_LAZYSWAP = 0x04000000
PF_HP_SBP = 0x08000000
class PfIA_64(enum.IntFlag):
"""Supplemental PF_* flags for EM_IA_64."""
PF_IA_64_NORECOV = 0x80000000
class PfMIPS(enum.IntFlag):
"""Supplemental PF_* flags for EM_MIPS."""
PF_MIPS_LOCAL = 0x10000000
class Shf(enum.IntFlag):
"""Section flags. Type of Shdr.sh_type values."""
SHF_WRITE = 1 << 0
SHF_ALLOC = 1 << 1
SHF_EXECINSTR = 1 << 2
SHF_MERGE = 1 << 4
SHF_STRINGS = 1 << 5
SHF_INFO_LINK = 1 << 6
SHF_LINK_ORDER = 1 << 7
SHF_OS_NONCONFORMING = 256
SHF_GROUP = 1 << 9
SHF_TLS = 1 << 10
SHF_COMPRESSED = 1 << 11
SHF_GNU_RETAIN = 1 << 21
SHF_ORDERED = 1 << 30
SHF_EXCLUDE = 1 << 31
class ShfALPHA(enum.IntFlag):
"""Supplemental SHF_* constants for EM_ALPHA."""
SHF_ALPHA_GPREL = 0x10000000
class ShfARM(enum.IntFlag):
"""Supplemental SHF_* constants for EM_ARM."""
SHF_ARM_ENTRYSECT = 0x10000000
SHF_ARM_COMDEF = 0x80000000
class ShfIA_64(enum.IntFlag):
"""Supplemental SHF_* constants for EM_IA_64."""
SHF_IA_64_SHORT = 0x10000000
SHF_IA_64_NORECOV = 0x20000000
class ShfMIPS(enum.IntFlag):
"""Supplemental SHF_* constants for EM_MIPS."""
SHF_MIPS_GPREL = 0x10000000
SHF_MIPS_MERGE = 0x20000000
SHF_MIPS_ADDR = 0x40000000
SHF_MIPS_STRINGS = 0x80000000
SHF_MIPS_NOSTRIP = 0x08000000
SHF_MIPS_LOCAL = 0x04000000
SHF_MIPS_NAMES = 0x02000000
SHF_MIPS_NODUPE = 0x01000000
class ShfPARISC(enum.IntFlag):
"""Supplemental SHF_* constants for EM_PARISC."""
SHF_PARISC_SHORT = 0x20000000
SHF_PARISC_HUGE = 0x40000000
SHF_PARISC_SBP = 0x80000000
class Stb(_OpenIntEnum):
"""ELF symbol binding type."""
STB_LOCAL = 0
STB_GLOBAL = 1
STB_WEAK = 2
STB_GNU_UNIQUE = 10
STB_MIPS_SPLIT_COMMON = 13
class Stt(_OpenIntEnum):
"""ELF symbol type."""
STT_NOTYPE = 0
STT_OBJECT = 1
STT_FUNC = 2
STT_SECTION = 3
STT_FILE = 4
STT_COMMON = 5
STT_TLS = 6
STT_GNU_IFUNC = 10
class SttARM(enum.Enum):
"""Supplemental STT_* constants for EM_ARM."""
STT_ARM_TFUNC = 13
STT_ARM_16BIT = 15
class SttPARISC(enum.Enum):
"""Supplemental STT_* constants for EM_PARISC."""
STT_HP_OPAQUE = 11
STT_HP_STUB = 12
STT_PARISC_MILLICODE = 13
class SttSPARC(enum.Enum):
"""Supplemental STT_* constants for EM_SPARC."""
STT_SPARC_REGISTER = 13
class SttX86_64(enum.Enum):
"""Supplemental STT_* constants for EM_X86_64."""
SHT_X86_64_UNWIND = 0x70000001
class Pt(_OpenIntEnum):
"""ELF program header types. Type of Phdr.p_type."""
PT_NULL = 0
PT_LOAD = 1
PT_DYNAMIC = 2
PT_INTERP = 3
PT_NOTE = 4
PT_SHLIB = 5
PT_PHDR = 6
PT_TLS = 7
PT_NUM = 8
PT_GNU_EH_FRAME = 0x6474e550
PT_GNU_STACK = 0x6474e551
PT_GNU_RELRO = 0x6474e552
PT_GNU_PROPERTY = 0x6474e553
PT_SUNWBSS = 0x6ffffffa
PT_SUNWSTACK = 0x6ffffffb
class PtARM(enum.Enum):
"""Supplemental PT_* constants for EM_ARM."""
PT_ARM_EXIDX = 0x70000001
class PtIA_64(enum.Enum):
"""Supplemental PT_* constants for EM_IA_64."""
PT_IA_64_HP_OPT_ANOT = 0x60000012
PT_IA_64_HP_HSL_ANOT = 0x60000013
PT_IA_64_HP_STACK = 0x60000014
PT_IA_64_ARCHEXT = 0x70000000
PT_IA_64_UNWIND = 0x70000001
class PtMIPS(enum.Enum):
"""Supplemental PT_* constants for EM_MIPS."""
PT_MIPS_REGINFO = 0x70000000
PT_MIPS_RTPROC = 0x70000001
PT_MIPS_OPTIONS = 0x70000002
PT_MIPS_ABIFLAGS = 0x70000003
class PtPARISC(enum.Enum):
"""Supplemental PT_* constants for EM_PARISC."""
PT_HP_TLS = 0x60000000
PT_HP_CORE_NONE = 0x60000001
PT_HP_CORE_VERSION = 0x60000002
PT_HP_CORE_KERNEL = 0x60000003
PT_HP_CORE_COMM = 0x60000004
PT_HP_CORE_PROC = 0x60000005
PT_HP_CORE_LOADABLE = 0x60000006
PT_HP_CORE_STACK = 0x60000007
PT_HP_CORE_SHM = 0x60000008
PT_HP_CORE_MMF = 0x60000009
PT_HP_PARALLEL = 0x60000010
PT_HP_FASTBIND = 0x60000011
PT_HP_OPT_ANNOT = 0x60000012
PT_HP_HSL_ANNOT = 0x60000013
PT_HP_STACK = 0x60000014
PT_PARISC_ARCHEXT = 0x70000000
PT_PARISC_UNWIND = 0x70000001
class Dt(_OpenIntEnum):
"""ELF dynamic segment tags. Type of Dyn.d_val."""
DT_NULL = 0
DT_NEEDED = 1
DT_PLTRELSZ = 2
DT_PLTGOT = 3
DT_HASH = 4
DT_STRTAB = 5
DT_SYMTAB = 6
DT_RELA = 7
DT_RELASZ = 8
DT_RELAENT = 9
DT_STRSZ = 10
DT_SYMENT = 11
DT_INIT = 12
DT_FINI = 13
DT_SONAME = 14
DT_RPATH = 15
DT_SYMBOLIC = 16
DT_REL = 17
DT_RELSZ = 18
DT_RELENT = 19
DT_PLTREL = 20
DT_DEBUG = 21
DT_TEXTREL = 22
DT_JMPREL = 23
DT_BIND_NOW = 24
DT_INIT_ARRAY = 25
DT_FINI_ARRAY = 26
DT_INIT_ARRAYSZ = 27
DT_FINI_ARRAYSZ = 28
DT_RUNPATH = 29
DT_FLAGS = 30
DT_PREINIT_ARRAY = 32
DT_PREINIT_ARRAYSZ = 33
DT_SYMTAB_SHNDX = 34
DT_RELRSZ = 35
DT_RELR = 36
DT_RELRENT = 37
DT_GNU_PRELINKED = 0x6ffffdf5
DT_GNU_CONFLICTSZ = 0x6ffffdf6
DT_GNU_LIBLISTSZ = 0x6ffffdf7
DT_CHECKSUM = 0x6ffffdf8
DT_PLTPADSZ = 0x6ffffdf9
DT_MOVEENT = 0x6ffffdfa
DT_MOVESZ = 0x6ffffdfb
DT_FEATURE_1 = 0x6ffffdfc
DT_POSFLAG_1 = 0x6ffffdfd
DT_SYMINSZ = 0x6ffffdfe
DT_SYMINENT = 0x6ffffdff
DT_GNU_HASH = 0x6ffffef5
DT_TLSDESC_PLT = 0x6ffffef6
DT_TLSDESC_GOT = 0x6ffffef7
DT_GNU_CONFLICT = 0x6ffffef8
DT_GNU_LIBLIST = 0x6ffffef9
DT_CONFIG = 0x6ffffefa
DT_DEPAUDIT = 0x6ffffefb
DT_AUDIT = 0x6ffffefc
DT_PLTPAD = 0x6ffffefd
DT_MOVETAB = 0x6ffffefe
DT_SYMINFO = 0x6ffffeff
DT_VERSYM = 0x6ffffff0
DT_RELACOUNT = 0x6ffffff9
DT_RELCOUNT = 0x6ffffffa
DT_FLAGS_1 = 0x6ffffffb
DT_VERDEF = 0x6ffffffc
DT_VERDEFNUM = 0x6ffffffd
DT_VERNEED = 0x6ffffffe
DT_VERNEEDNUM = 0x6fffffff
DT_AUXILIARY = 0x7ffffffd
DT_FILTER = 0x7fffffff
class DtAARCH64(enum.Enum):
"""Supplemental DT_* constants for EM_AARCH64."""
DT_AARCH64_BTI_PLT = 0x70000001
DT_AARCH64_PAC_PLT = 0x70000003
DT_AARCH64_VARIANT_PCS = 0x70000005
class DtALPHA(enum.Enum):
"""Supplemental DT_* constants for EM_ALPHA."""
DT_ALPHA_PLTRO = 0x70000000
class DtALTERA_NIOS2(enum.Enum):
"""Supplemental DT_* constants for EM_ALTERA_NIOS2."""
DT_NIOS2_GP = 0x70000002
class DtIA_64(enum.Enum):
"""Supplemental DT_* constants for EM_IA_64."""
DT_IA_64_PLT_RESERVE = 0x70000000
class DtMIPS(enum.Enum):
"""Supplemental DT_* constants for EM_MIPS."""
DT_MIPS_RLD_VERSION = 0x70000001
DT_MIPS_TIME_STAMP = 0x70000002
DT_MIPS_ICHECKSUM = 0x70000003
DT_MIPS_IVERSION = 0x70000004
DT_MIPS_FLAGS = 0x70000005
DT_MIPS_BASE_ADDRESS = 0x70000006
DT_MIPS_MSYM = 0x70000007
DT_MIPS_CONFLICT = 0x70000008
DT_MIPS_LIBLIST = 0x70000009
DT_MIPS_LOCAL_GOTNO = 0x7000000a
DT_MIPS_CONFLICTNO = 0x7000000b
DT_MIPS_LIBLISTNO = 0x70000010
DT_MIPS_SYMTABNO = 0x70000011
DT_MIPS_UNREFEXTNO = 0x70000012
DT_MIPS_GOTSYM = 0x70000013
DT_MIPS_HIPAGENO = 0x70000014
DT_MIPS_RLD_MAP = 0x70000016
DT_MIPS_DELTA_CLASS = 0x70000017
DT_MIPS_DELTA_CLASS_NO = 0x70000018
DT_MIPS_DELTA_INSTANCE = 0x70000019
DT_MIPS_DELTA_INSTANCE_NO = 0x7000001a
DT_MIPS_DELTA_RELOC = 0x7000001b
DT_MIPS_DELTA_RELOC_NO = 0x7000001c
DT_MIPS_DELTA_SYM = 0x7000001d
DT_MIPS_DELTA_SYM_NO = 0x7000001e
DT_MIPS_DELTA_CLASSSYM = 0x70000020
DT_MIPS_DELTA_CLASSSYM_NO = 0x70000021
DT_MIPS_CXX_FLAGS = 0x70000022
DT_MIPS_PIXIE_INIT = 0x70000023
DT_MIPS_SYMBOL_LIB = 0x70000024
DT_MIPS_LOCALPAGE_GOTIDX = 0x70000025
DT_MIPS_LOCAL_GOTIDX = 0x70000026
DT_MIPS_HIDDEN_GOTIDX = 0x70000027
DT_MIPS_PROTECTED_GOTIDX = 0x70000028
DT_MIPS_OPTIONS = 0x70000029
DT_MIPS_INTERFACE = 0x7000002a
DT_MIPS_DYNSTR_ALIGN = 0x7000002b
DT_MIPS_INTERFACE_SIZE = 0x7000002c
DT_MIPS_RLD_TEXT_RESOLVE_ADDR = 0x7000002d
DT_MIPS_PERF_SUFFIX = 0x7000002e
DT_MIPS_COMPACT_SIZE = 0x7000002f
DT_MIPS_GP_VALUE = 0x70000030
DT_MIPS_AUX_DYNAMIC = 0x70000031
DT_MIPS_PLTGOT = 0x70000032
DT_MIPS_RWPLT = 0x70000034
DT_MIPS_RLD_MAP_REL = 0x70000035
DT_MIPS_XHASH = 0x70000036
class DtPPC(enum.Enum):
"""Supplemental DT_* constants for EM_PPC."""
DT_PPC_GOT = 0x70000000
DT_PPC_OPT = 0x70000001
class DtPPC64(enum.Enum):
"""Supplemental DT_* constants for EM_PPC64."""
DT_PPC64_GLINK = 0x70000000
DT_PPC64_OPD = 0x70000001
DT_PPC64_OPDSZ = 0x70000002
DT_PPC64_OPT = 0x70000003
class DtSPARC(enum.Enum):
"""Supplemental DT_* constants for EM_SPARC."""
DT_SPARC_REGISTER = 0x70000001
class StInfo:
"""ELF symbol binding and type. Type of the Sym.st_info field."""
def __init__(self, arg0, arg1=None):
if isinstance(arg0, int) and arg1 is None:
self.bind = Stb(arg0 >> 4)
self.type = Stt(arg0 & 15)
else:
self.bind = Stb(arg0)
self.type = Stt(arg1)
def value(self):
"""Returns the raw value for the bind/type combination."""
return (self.bind.value() << 4) | (self.type.value())
# Type in an ELF file. Used for deserialization.
_Layout = collections.namedtuple('_Layout', 'unpack size')
def _define_layouts(baseclass: type, layout32: str, layout64: str,
types=None, fields32=None):
"""Assign variants dict to baseclass.
The variants dict is indexed by (ElfClass, ElfData) pairs, and its
values are _Layout instances.
"""
struct32 = struct.Struct(layout32)
struct64 = struct.Struct(layout64)
# Check that the struct formats yield the right number of components.
for s in (struct32, struct64):
example = s.unpack(b' ' * s.size)
if len(example) != len(baseclass._fields):
raise ValueError('{!r} yields wrong field count: {} != {}'.format(
s.format, len(example), len(baseclass._fields)))
# Check that field names in types are correct.
if types is None:
types = ()
for n in types:
if n not in baseclass._fields:
raise ValueError('{} does not have field {!r}'.format(
baseclass.__name__, n))
if fields32 is not None \
and set(fields32) != set(baseclass._fields):
raise ValueError('{!r} is not a permutation of the fields {!r}'.format(
fields32, baseclass._fields))
def unique_name(name, used_names = (set((baseclass.__name__,))
| set(baseclass._fields)
| {n.__name__
for n in (types or {}).values()})):
"""Find a name that is not used for a class or field name."""
candidate = name
n = 0
while candidate in used_names:
n += 1
candidate = '{}{}'.format(name, n)
used_names.add(candidate)
return candidate
blob_name = unique_name('blob')
struct_unpack_name = unique_name('struct_unpack')
comps_name = unique_name('comps')
layouts = {}
for (bits, elfclass, layout, fields) in (
(32, ElfClass.ELFCLASS32, layout32, fields32),
(64, ElfClass.ELFCLASS64, layout64, None),
):
for (elfdata, structprefix, funcsuffix) in (
(ElfData.ELFDATA2LSB, '<', 'LE'),
(ElfData.ELFDATA2MSB, '>', 'BE'),
):
env = {
baseclass.__name__: baseclass,
struct_unpack_name: struct.unpack,
}
# Add the type converters.
if types:
for cls in types.values():
env[cls.__name__] = cls
funcname = ''.join(
('unpack_', baseclass.__name__, str(bits), funcsuffix))
code = '''
def {funcname}({blob_name}):
'''.format(funcname=funcname, blob_name=blob_name)
indent = ' ' * 4
unpack_call = '{}({!r}, {})'.format(
struct_unpack_name, structprefix + layout, blob_name)
field_names = ', '.join(baseclass._fields)
if types is None and fields is None:
code += '{}return {}({})\n'.format(
indent, baseclass.__name__, unpack_call)
else:
# Destructuring tuple assignment.
if fields is None:
code += '{}{} = {}\n'.format(
indent, field_names, unpack_call)
else:
# Use custom field order.
code += '{}{} = {}\n'.format(
indent, ', '.join(fields), unpack_call)
# Perform the type conversions.
for n in baseclass._fields:
if n in types:
code += '{}{} = {}({})\n'.format(
indent, n, types[n].__name__, n)
# Create the named tuple.
code += '{}return {}({})\n'.format(
indent, baseclass.__name__, field_names)
exec(code, env)
layouts[(elfclass, elfdata)] = _Layout(
env[funcname], struct.calcsize(layout))
baseclass.layouts = layouts
# Corresponds to EI_* indices into Elf*_Ehdr.e_indent.
class Ident(collections.namedtuple('Ident',
'ei_mag ei_class ei_data ei_version ei_osabi ei_abiversion ei_pad')):
def __new__(cls, *args):
"""Construct an object from a blob or its constituent fields."""
if len(args) == 1:
return cls.unpack(args[0])
return cls.__base__.__new__(cls, *args)
@staticmethod
def unpack(blob: memoryview) -> 'Ident':
"""Parse raws data into a tuple."""
ei_mag, ei_class, ei_data, ei_version, ei_osabi, ei_abiversion, \
ei_pad = struct.unpack('4s5B7s', blob)
return Ident(ei_mag, ElfClass(ei_class), ElfData(ei_data),
ei_version, ei_osabi, ei_abiversion, ei_pad)
size = 16
# Corresponds to Elf32_Ehdr and Elf64_Ehdr.
Ehdr = collections.namedtuple('Ehdr',
'e_ident e_type e_machine e_version e_entry e_phoff e_shoff e_flags'
+ ' e_ehsize e_phentsize e_phnum e_shentsize e_shnum e_shstrndx')
_define_layouts(Ehdr,
layout32='16s2H5I6H',
layout64='16s2HI3QI6H',
types=dict(e_ident=Ident,
e_machine=Machine,
e_type=Et,
e_shstrndx=Shn))
# Corresponds to Elf32_Phdr and Elf64_Pdhr. Order follows the latter.
Phdr = collections.namedtuple('Phdr',
'p_type p_flags p_offset p_vaddr p_paddr p_filesz p_memsz p_align')
_define_layouts(Phdr,
layout32='8I',
fields32=('p_type', 'p_offset', 'p_vaddr', 'p_paddr',
'p_filesz', 'p_memsz', 'p_flags', 'p_align'),
layout64='2I6Q',
types=dict(p_type=Pt, p_flags=Pf))
# Corresponds to Elf32_Shdr and Elf64_Shdr.
class Shdr(collections.namedtuple('Shdr',
'sh_name sh_type sh_flags sh_addr sh_offset sh_size sh_link sh_info'
+ ' sh_addralign sh_entsize')):
def resolve(self, strtab: 'StringTable') -> 'Shdr':
"""Resolve sh_name using a string table."""
return self.__class__(strtab.get(self[0]), *self[1:])
_define_layouts(Shdr,
layout32='10I',
layout64='2I4Q2I2Q',
types=dict(sh_type=Sht,
sh_flags=Shf,
sh_link=Shn))
# Corresponds to Elf32_Dyn and Elf64_Dyn. The nesting through the
# d_un union is skipped, and d_ptr is missing (its representation in
# Python would be identical to d_val).
Dyn = collections.namedtuple('Dyn', 'd_tag d_val')
_define_layouts(Dyn,
layout32='2i',
layout64='2q',
types=dict(d_tag=Dt))
# Corresponds to Elf32_Sym and Elf64_Sym.
class Sym(collections.namedtuple('Sym',
'st_name st_info st_other st_shndx st_value st_size')):
def resolve(self, strtab: 'StringTable') -> 'Sym':
"""Resolve st_name using a string table."""
return self.__class__(strtab.get(self[0]), *self[1:])
_define_layouts(Sym,
layout32='3I2BH',
layout64='I2BH2Q',
fields32=('st_name', 'st_value', 'st_size', 'st_info',
'st_other', 'st_shndx'),
types=dict(st_shndx=Shn,
st_info=StInfo))
# Corresponds to Elf32_Rel and Elf64_Rel.
Rel = collections.namedtuple('Rel', 'r_offset r_info')
_define_layouts(Rel,
layout32='2I',
layout64='2Q')
# Corresponds to Elf32_Rel and Elf64_Rel.
Rela = collections.namedtuple('Rela', 'r_offset r_info r_addend')
_define_layouts(Rela,
layout32='3I',
layout64='3Q')
class StringTable:
"""ELF string table."""
def __init__(self, blob):
"""Create a new string table backed by the data in the blob.
blob: a memoryview-like object
"""
self.blob = blob
def get(self, index) -> bytes:
"""Returns the null-terminated byte string at the index."""
blob = self.blob
endindex = index
while True:
if blob[endindex] == 0:
return bytes(blob[index:endindex])
endindex += 1
class Image:
"""ELF image parser."""
def __init__(self, image):
"""Create an ELF image from binary image data.
image: a memoryview-like object that supports efficient range
subscripting.
"""
self.image = image
ident = self.read(Ident, 0)
classdata = (ident.ei_class, ident.ei_data)
# Set self.Ehdr etc. to the subtypes with the right parsers.
for typ in (Ehdr, Phdr, Shdr, Dyn, Sym, Rel, Rela):
setattr(self, typ.__name__, typ.layouts.get(classdata, None))
if self.Ehdr is not None:
self.ehdr = self.read(self.Ehdr, 0)
self._shdr_num = self._compute_shdr_num()
else:
self.ehdr = None
self._shdr_num = 0
self._section = {}
self._stringtab = {}
if self._shdr_num > 0:
self._shdr_strtab = self._find_shdr_strtab()
else:
self._shdr_strtab = None
@staticmethod
def readfile(path: str) -> 'Image':
"""Reads the ELF file at the specified path."""
with open(path, 'rb') as inp:
return Image(memoryview(inp.read()))
def _compute_shdr_num(self) -> int:
"""Computes the actual number of section headers."""
shnum = self.ehdr.e_shnum
if shnum == 0:
if self.ehdr.e_shoff == 0 or self.ehdr.e_shentsize == 0:
# No section headers.
return 0
# Otherwise the extension mechanism is used (which may be
# needed because e_shnum is just 16 bits).
return self.read(self.Shdr, self.ehdr.e_shoff).sh_size
return shnum
def _find_shdr_strtab(self) -> StringTable:
"""Finds the section header string table (maybe via extensions)."""
shstrndx = self.ehdr.e_shstrndx
if shstrndx == Shn.SHN_XINDEX:
shstrndx = self.read(self.Shdr, self.ehdr.e_shoff).sh_link
return self._find_stringtab(shstrndx)
def read(self, typ: type, offset:int ):
"""Reads an object at a specific offset.
The type must have been enhanced using _define_variants.
"""
return typ.unpack(self.image[offset: offset + typ.size])
def phdrs(self) -> Phdr:
"""Generator iterating over the program headers."""
if self.ehdr is None:
return
size = self.ehdr.e_phentsize
if size != self.Phdr.size:
raise ValueError('Unexpected Phdr size in ELF header: {} != {}'
.format(size, self.Phdr.size))
offset = self.ehdr.e_phoff
for _ in range(self.ehdr.e_phnum):
yield self.read(self.Phdr, offset)
offset += size
def shdrs(self, resolve: bool=True) -> Shdr:
"""Generator iterating over the section headers.
If resolve, section names are automatically translated
using the section header string table.
"""
if self._shdr_num == 0:
return
size = self.ehdr.e_shentsize
if size != self.Shdr.size:
raise ValueError('Unexpected Shdr size in ELF header: {} != {}'
.format(size, self.Shdr.size))
offset = self.ehdr.e_shoff
for _ in range(self._shdr_num):
shdr = self.read(self.Shdr, offset)
if resolve:
shdr = shdr.resolve(self._shdr_strtab)
yield shdr
offset += size
def dynamic(self) -> Dyn:
"""Generator iterating over the dynamic segment."""
for phdr in self.phdrs():
if phdr.p_type == Pt.PT_DYNAMIC:
# Pick the first dynamic segment, like the loader.
if phdr.p_filesz == 0:
# Probably separated debuginfo.
return
offset = phdr.p_offset
end = offset + phdr.p_memsz
size = self.Dyn.size
while True:
next_offset = offset + size
if next_offset > end:
raise ValueError(
'Dynamic segment size {} is not a multiple of Dyn size {}'.format(
phdr.p_memsz, size))
yield self.read(self.Dyn, offset)
if next_offset == end:
return
offset = next_offset
def syms(self, shdr: Shdr, resolve: bool=True) -> Sym:
"""A generator iterating over a symbol table.
If resolve, symbol names are automatically translated using
the string table for the symbol table.
"""
assert shdr.sh_type == Sht.SHT_SYMTAB
size = shdr.sh_entsize
if size != self.Sym.size:
raise ValueError('Invalid symbol table entry size {}'.format(size))
offset = shdr.sh_offset
end = shdr.sh_offset + shdr.sh_size
if resolve:
strtab = self._find_stringtab(shdr.sh_link)
while offset < end:
sym = self.read(self.Sym, offset)
if resolve:
sym = sym.resolve(strtab)
yield sym
offset += size
if offset != end:
raise ValueError('Symbol table is not a multiple of entry size')
def lookup_string(self, strtab_index: int, strtab_offset: int) -> bytes:
"""Looks up a string in a string table identified by its link index."""
try:
strtab = self._stringtab[strtab_index]
except KeyError:
strtab = self._find_stringtab(strtab_index)
return strtab.get(strtab_offset)
def find_section(self, shndx: Shn) -> Shdr:
"""Returns the section header for the indexed section.
The section name is not resolved.
"""
try:
return self._section[shndx]
except KeyError:
pass
if shndx in Shn:
raise ValueError('Reserved section index {}'.format(shndx))
idx = shndx.value
if idx < 0 or idx > self._shdr_num:
raise ValueError('Section index {} out of range [0, {})'.format(
idx, self._shdr_num))
shdr = self.read(
self.Shdr, self.ehdr.e_shoff + idx * self.Shdr.size)
self._section[shndx] = shdr
return shdr
def _find_stringtab(self, sh_link: int) -> StringTable:
if sh_link in self._stringtab:
return self._stringtab
if sh_link < 0 or sh_link >= self._shdr_num:
raise ValueError('Section index {} out of range [0, {})'.format(
sh_link, self._shdr_num))
shdr = self.read(
self.Shdr, self.ehdr.e_shoff + sh_link * self.Shdr.size)
if shdr.sh_type != Sht.SHT_STRTAB:
raise ValueError(
'Section {} is not a string table: {}'.format(
sh_link, shdr.sh_type))
strtab = StringTable(
self.image[shdr.sh_offset:shdr.sh_offset + shdr.sh_size])
# This could retrain essentially arbitrary amounts of data,
# but caching string tables seems important for performance.
self._stringtab[sh_link] = strtab
return strtab
__all__ = [name for name in dir() if name[0].isupper()]
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