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László Monda
2016-08-10 01:45:15 +02:00
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#!/usr/bin/env python
#
# ORIGINAL AUTHOR, COPYRIGHT and LICENSE
#
# Copyright (c) 2003-2010 Chris Liechti <cliechti@gmx.net>
# All Rights Reserved.
# Simplified BSD License (see LICENSE.txt for full text)
#
#
# MODIFICATIONS
#
# Copyright (c) 2014 Freescale Semiconductor, Inc.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without modification,
# are permitted provided that the following conditions are met:
#
# o Redistributions of source code must retain the above copyright notice, this list
# of conditions and the following disclaimer.
#
# o Redistributions in binary form must reproduce the above copyright notice, this
# list of conditions and the following disclaimer in the documentation and/or
# other materials provided with the distribution.
#
# o Neither the name of Freescale Semiconductor, Inc. nor the names of its
# contributors may be used to endorse or promote products derived from this
# software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
# ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
# ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
"""\
ELF object file reader.
"""
import struct
# size alignment
# Elf32_Addr 4 4 Unsigned program address
# Elf32_Half 2 2 Unsigned medium integer
# Elf32_Off 4 4 Unsigned file offset
# Elf32_Sword 4 4 Signed large integer
# Elf32_Word 4 4 Unsigned large integer
# unsignedchar 1 1 Unsigned small integer
#define EI_NIDENT 16
#~ typedef struct{
#~ unsigned char e_ident[EI_NIDENT];
#~ Elf32_Half e_type;
#~ Elf32_Half e_machine;
#~ Elf32_Word e_version;
#~ Elf32_Addr e_entry;
#~ Elf32_Off e_phoff;
#~ Elf32_Off e_shoff;
#~ Elf32_Word e_flags;
#~ Elf32_Half e_ehsize;
#~ Elf32_Half e_phentsize;
#~ Elf32_Half e_phnum;
#~ Elf32_Half e_shentsize;
#~ Elf32_Half e_shnum;
#~ Elf32_Half e_shstrndx;
#~ } Elf32_Ehdr;
#Section Header
#~ typedef struct {
#~ Elf32_Word sh_name;
#~ Elf32_Word sh_type;
#~ Elf32_Word sh_flags;
#~ Elf32_Addr sh_addr;
#~ Elf32_Off sh_offset;
#~ Elf32_Word sh_size;
#~ Elf32_Word sh_link;
#~ Elf32_Word sh_info;
#~ Elf32_Word sh_addralign;
#~ Elf32_Word sh_entsize;
#~ } Elf32_Shdr;
#~ typedef struct {
#~ Elf32_Word p_type;
#~ Elf32_Off p_offset;
#~ Elf32_Addr p_vaddr;
#~ Elf32_Addr p_paddr;
#~ Elf32_Word p_filesz;
#~ Elf32_Word p_memsz;
#~ Elf32_Word p_flags;
#~ Elf32_Word p_align;
#~ } Elf32_Phdr;
# struct Elf32_Sym
# {
# Elf32_Word st_name; //!< Index into file's string table.
# Elf32_Addr st_value; //!< Value associated with the symbol. Depends on context.
# Elf32_Word st_size; //!< Size associated with symbol. 0 if the symbol has no size or an unknown size.
# unsigned char st_info; //!< Specified the symbol's type and binding attributes.
# unsigned char st_other; //!< Currently 0 (reserved).
# Elf32_Half st_shndx; //!< Section header table index for this symbol.
# };
class ELFException(Exception): pass
class ELFSymbol:
Elf32_Sym = "<IIIBBH"
STB_LOCAL = 0, # Local symbol not visible outside the object file.
STB_GLOBAL = 1 # Symbol is visible to all object files being linked together.
STB_WEAK = 2 # Like global symbols, but with lower precedence.
STB_LOPROC = 13
STB_HIPROC = 15
STT_NOTYPE = 0 # The symbol's type is not specified.
STT_OBJECT = 1 # The symbol is associated with a data object, such as a variable or array.
STT_FUNC = 2 # The symbol is associated with a function or other executable code.
STT_SECTION = 3 # The synmbol is associated with a section. Primarily used for relocation.
STT_FILE = 4 # A file symbol has STB_LOCAL binding, its section index is SHN_ABS, and it precedes the other STB_LOCAL symbols for the file, if it is present.
STT_LOPROC = 13 # Low bound of processor-specific symbol types.
STT_HIPROC = 15 # High bound of processor-specific symbol types.
ARM_SEQUENCE_MAPSYM = "$a"
DATA_SEQUENCE_MAPSYM = "$d"
THUMB_SEQUENCE_MAPSYM = "$t"
THUMB_BL_TAGSYM = "$b"
FN_PTR_CONST_TAGSYM = "$f"
INDIRECT_FN_CALL_TAGSYM = "$p"
MAPPING_SYMBOL_COUNT_TAGSYM = "$m"
def __init__(self):
(self.st_name, self.st_value, self.st_size, self.st_info,
self.st_other, self.st_shndx, self.st_bind, self.st_type) = [0] * 8
self.name = None
def fromString(self, s):
(self.st_name, self.st_value, self.st_size, self.st_info,
self.st_other, self.st_shndx) = struct.unpack(self.Elf32_Sym, s)
self.st_bind = (self.st_info >> 4) & 0x0f
self.st_type = self.st_info & 0x0f
def __repr__(self):
return "%s(%s, st_value=0x%08x, st_size=%d, st_bind=%d, st_type=%d, st_shndx=%d)" % (
self.__class__.__name__,
self.name is not None and "%r" % self.name or "st_name=%s" % self.st_name,
self.st_value, self.st_size, self.st_bind, self.st_type, self.st_shndx)
class ELFSection:
"""read and store a section"""
Elf32_Shdr = "<IIIIIIIIII" #header format
#section types
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_LOPROC = 0x70000000L
SHT_HIPROC = 0x7fffffffL
SHT_LOUSER = 0x80000000L
SHT_HIUSER = 0xffffffffL
#section attribute flags
SHF_WRITE = 0x1
SHF_ALLOC = 0x2
SHF_EXECINSTR = 0x4
SHF_MASKPROC = 0xf0000000
def __init__(self):
"""creat a new empty section object"""
(self.sh_name, self.sh_type, self.sh_flags, self.sh_addr,
self.sh_offset, self.sh_size, self.sh_link, self.sh_info,
self.sh_addralign, self.sh_entsize) = [0]*10
self.name = None
self.data = None
self.lma = None
def fromString(self, s):
"""get section header from string"""
(self.sh_name, self.sh_type, self.sh_flags, self.sh_addr,
self.sh_offset, self.sh_size, self.sh_link, self.sh_info,
self.sh_addralign, self.sh_entsize) = struct.unpack(self.Elf32_Shdr, s)
def __repr__(self):
"""pretty print for debug..."""
return "%s(%s, sh_type=%s, sh_flags=%s, "\
"sh_addr=0x%04x, sh_offset=0x%04x, sh_size=%s, sh_link=%s, "\
"sh_info=%s, sh_addralign=%s, sh_entsize=%s, lma=0x%04x)" % (
self.__class__.__name__,
self.name is not None and "%r" % self.name or "sh_name=%s" % self.sh_name,
self.sh_type, self.sh_flags, self.sh_addr,
self.sh_offset, self.sh_size, self.sh_link, self.sh_info,
self.sh_addralign, self.sh_entsize, self.lma)
class ELFProgramHeader:
"""Store and parse a program header"""
Elf32_Phdr = "<IIIIIIII" #header format
#segmet types
PT_NULL = 0
PT_LOAD = 1
PT_DYNAMIC = 2
PT_INTERP = 3
PT_NOTE = 4
PT_SHLIB = 5
PT_PHDR = 6
PT_LOPROC = 0x70000000L
PT_HIPROC = 0x7fffffffL
#segment flags
PF_R = 0x4 #segment is readable
PF_W = 0x2 #segment is writable
PF_X = 0x1 #segment is executable
def __init__(self):
"""create a new, empty segment/program header"""
(self.p_type, self.p_offset, self.p_vaddr, self.p_paddr,
self.p_filesz, self.p_memsz, self.p_flags, self.p_align) = [0]*8
self.data = None
def fromString(self, s):
"""parse header info from string"""
(self.p_type, self.p_offset, self.p_vaddr, self.p_paddr,
self.p_filesz, self.p_memsz, self.p_flags,
self.p_align) = struct.unpack(self.Elf32_Phdr, s)
def __repr__(self):
"""pretty print for debug..."""
return "%s(p_type=%s, p_offset=0x%04x, p_vaddr=0x%04x, p_paddr=0x%04x, "\
"p_filesz=%s, p_memsz=%s, p_flags=%s, "\
"p_align=%s)" % (
self.__class__.__name__,
self.p_type, self.p_offset, self.p_vaddr, self.p_paddr,
self.p_filesz, self.p_memsz, self.p_flags,
self.p_align)
class ELFObject:
"""Object to read and handle an LEF object file"""
#header information
Elf32_Ehdr = "<16sHHIIIIIHHHHHH"
#offsets within e_ident
EI_MAG0 = 0 #File identification
EI_MAG1 = 1 #File identification
EI_MAG2 = 2 #File identification
EI_MAG3 = 3 #File identification
EI_CLASS = 4 #File class
EI_DATA = 5 #Data encoding
EI_VERSION = 6 #File version
EI_PAD = 7 #Start of padding bytes
EI_NIDENT = 16 #Size of e_ident[]
#elf file type flags
ET_NONE = 0 #No file type
ET_REL = 1 #Relocatable file
ET_EXEC = 2 #Executable file
ET_DYN = 3 #Shared object file
ET_CORE = 4 #Core file
ET_LOPROC = 0xff00 #Processor-specific
ET_HIPROC = 0xffff #Processor-specific
#ELF format
ELFCLASSNONE = 0 #Invalid class
ELFCLASS32 = 1 #32-bit objects
ELFCLASS64 = 2 #64-bit objects
#encoding
ELFDATANONE = 0 #Invalid data encoding
ELFDATA2LSB = 1 #See below
ELFDATA2MSB = 2 #See below
def __init__(self):
"""create a new elf object"""
(self.e_ident, self.e_type, self.e_machine, self.e_version,
self.e_entry, self.e_phoff, self.e_shoff,
self.e_flags, self.e_ehsize, self.e_phentsize, self.e_phnum,
self.e_shentsize, self.e_shnum, self.e_shstrndx) = [0]*14
def fromFile(self, fileobj):
"""read all relevant data from fileobj.
the file must be seekable"""
fileobj.seek(0)
#get file header
(self.e_ident, self.e_type, self.e_machine, self.e_version,
self.e_entry, self.e_phoff, self.e_shoff,
self.e_flags, self.e_ehsize, self.e_phentsize, self.e_phnum,
self.e_shentsize, self.e_shnum, self.e_shstrndx) = struct.unpack(
self.Elf32_Ehdr, fileobj.read(struct.calcsize(self.Elf32_Ehdr)))
#verify if its a known format and realy an ELF file
if self.e_ident[0:4] != '\x7fELF' and\
self.e_ident[self.EI_CLASS] != self.ELFCLASS32 and\
self.e_ident[self.EI_DATA] != self.ELFDATA2LSB and\
self.e_ident[self.EI_VERSION] != 1:
raise ELFException("Not a valid ELF file")
#load programm headers
self.programmheaders = []
if self.e_phnum:
#load program headers
fileobj.seek(self.e_phoff)
for sectionnum in range(self.e_phnum):
shdr = (fileobj.read(self.e_phentsize) + '\0'* struct.calcsize(ELFProgramHeader.Elf32_Phdr))[0:struct.calcsize(ELFProgramHeader.Elf32_Phdr)]
psection = ELFProgramHeader()
psection.fromString(shdr)
if psection.p_offset: #skip if section has invalid offset in file
self.programmheaders.append(psection)
#~ #get the segment data from the file for each prg header
#~ for phdr in self.programmheaders:
#~ fileobj.seek(phdr.p_offset)
#~ phdr.data = fileobj.read(phdr.p_filesz)
#~ #pad if needed
#~ if phdr.p_filesz < phdr.p_memsz:
#~ phdr.data = phdr.data + '\0' * (phdr.p_memsz-phdr.p_filesz)
#load sections
self.sections = []
fileobj.seek(self.e_shoff)
for sectionnum in range(self.e_shnum):
shdr = (fileobj.read(self.e_shentsize) + '\0'* struct.calcsize(ELFSection.Elf32_Shdr))[0:struct.calcsize(ELFSection.Elf32_Shdr)]
elfsection = ELFSection()
elfsection.fromString(shdr)
self.sections.append(elfsection)
#load data for all sections
for section in self.sections:
fileobj.seek(section.sh_offset)
data = fileobj.read(section.sh_size)
section.data = data
if section.sh_type == ELFSection.SHT_STRTAB:
section.values = data.split('\0')
section.lma = self.getLMA(section)
#get section names
for section in self.sections:
# start = self.sections[self.e_shstrndx].data[section.sh_name:]
# section.name = start.split('\0')[0]
section.name = self.getString(self.e_shstrndx, section.sh_name)
# Load symbols.
symtab = self.getSection('.symtab')
symsize = symtab.sh_entsize
self.symbolCount = symtab.sh_size / symsize
self.symbols = []
self.symbolDict = {}
for symnum in range(self.symbolCount):
# Compute range
start = symnum * symsize
end = start + symsize
# Create symbol
sym = ELFSymbol()
sym.fromString(symtab.data[start:end])
# Read symbol name string
sym.name = self.getString(symtab.sh_link, sym.st_name)
# Add to symbol list
self.symbols.append(sym)
self.symbolDict[sym.name] = sym
def getString(self, table, index):
start = self.sections[table].data[index:]
return start.split('\0')[0]
def getSection(self, name):
"""get section by name"""
for section in self.sections:
if section.name == name:
return section
def getSymbol(self, name):
return self.symbolDict[name]
def getProgrammableSections(self):
"""get all program headers that are marked as executable and
have suitable attributes to be code"""
res = []
for p in self.programmheaders:
#~ print p
#~ if section.sh_flags & self.SHF_ALLOC and section.name not in ('.data', '.data1', '.bss'):
#~ if p.p_type == ELFProgramHeader.PT_LOAD:# and p.p_paddr == p.p_vaddr and p.p_flags & ELFProgramHeader.PF_X:
if p.p_type == ELFProgramHeader.PT_LOAD:
res.append(p)
return res
def getLMA(self, section):
#magic load memory address calculation ;-)
for p in self.programmheaders:
if (p.p_paddr != 0 and \
p.p_type == ELFProgramHeader.PT_LOAD and \
p.p_vaddr != p.p_paddr and \
p.p_vaddr <= section.sh_addr and \
(p.p_vaddr + p.p_memsz >= section.sh_addr + section.sh_size) \
and (not (section.sh_flags & ELFSection.SHF_ALLOC and section.sh_type != ELFSection.SHT_NOBITS) \
or (p.p_offset <= section.sh_offset \
and (p.p_offset + p.p_filesz >= section.sh_offset + section.sh_size)))):
return section.sh_addr + p.p_paddr - p.p_vaddr
return section.sh_addr
def getSections(self):
"""get sections relevant for the application"""
res = []
for section in self.sections:
if section.sh_flags & ELFSection.SHF_ALLOC and section.sh_type != ELFSection.SHT_NOBITS:
res.append(section)
return res
def __repr__(self):
"""pretty print for debug..."""
return "%s(self.e_type=%r, self.e_machine=%r, self.e_version=%r, sections=%r)" % (
self.__class__.__name__,
self.e_type, self.e_machine, self.e_version,
[section.name for section in self.sections])
if __name__ == '__main__':
print "This is only a module test!"
elf = ELFObject()
elf.fromFile(open("test.elf"))
if elf.e_type != ELFObject.ET_EXEC:
raise Exception("No executable")
print elf
#~ print repr(elf.getSection('.text').data)
#~ print [(s.name, hex(s.sh_addr)) for s in elf.getSections()]
print "-"*20
for p in elf.sections: print p
print "-"*20
for p in elf.getSections(): print p
print "-"*20
for p in elf.getProgrammableSections(): print p