mirror of
https://github.com/saymrwulf/uhd.git
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142 lines
4 KiB
Python
Executable file
142 lines
4 KiB
Python
Executable file
#!/usr/bin/env python
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#
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# Copyright 2009 Free Software Foundation, Inc.
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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import sys
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import struct
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from optparse import OptionParser
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from pprint import pprint
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import sbf
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# see /usr/include/elf.h for the various magic values
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_ehdr_fmt = ">16sHH5I6H"
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_ehdr_fmt_size = struct.calcsize(_ehdr_fmt)
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_phdr_fmt = ">8I"
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_phdr_fmt_size = struct.calcsize(_phdr_fmt)
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class elf32_ehdr(object):
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def __init__(self, s):
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(self.ident, self.type, self.machine, self.version, self.entry,
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self.phoff, self.shoff, self.flags, self.ehsize,
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self.phentsize, self.phnum, self.shentsize, self.shnum,
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self.shstrndx) = struct.unpack(_ehdr_fmt, s)
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class elf32_phdr(object):
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def __init__(self, s):
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(self.type, self.offset, self.vaddr, self.paddr,
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self.filesz, self.memsz,
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self.flags, self.align) = struct.unpack(_phdr_fmt, s)
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def __repr__(self):
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return "<elf32_phdr %s offset=%d paddr=0x%x, filesz=%d>" % (
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p_type_str(self.type), self.offset, self.paddr, self.filesz)
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def p_type_str(t):
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if t <= 8:
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return ('NULL', 'LOAD', 'DYNAMIC', 'INTERP', 'NOTE', 'SHLIB', 'PHDR', 'TLS', 'NUM')[t]
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return "0x%x" % (t,)
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def _get_ehdr(f):
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if len(f) < _ehdr_fmt_size:
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return False
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ehdr = elf32_ehdr(f[0:_ehdr_fmt_size])
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return ehdr
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def elf32_big_endian_exec_p(f):
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ehdr = _get_ehdr(f)
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if not ehdr:
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return False
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#pprint(ehdr, sys.stderr)
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e_ident = ehdr.ident
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if not e_ident.startswith('\177ELF'):
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return False
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if (ord(e_ident[4]) != 1 # EI_CLASS == CLASS32
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or ord(e_ident[5]) != 2 # EI_DATA == DATA2MSB
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or ord(e_ident[6]) != 1 # EI_VERSION == EV_CURRENT
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):
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return False
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if ehdr.type != 2: # e_type == ET_EXEC
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return False
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return True
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# return (entry, (phdr, ...))
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def get_elf32_prog_headers(f):
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ehdr = _get_ehdr(f)
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entry = ehdr.entry
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phoff = ehdr.phoff
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phentsize = ehdr.phentsize
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phnum = ehdr.phnum
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def extract(i):
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start = phoff + i * phentsize
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end = start + phentsize
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return f[start:end]
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return (entry, [elf32_phdr(extract(i)) for i in range(phnum)])
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def main():
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usage = "%prog: [options] elf_file"
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parser = OptionParser()
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parser.add_option("-o", "--output", default=None,
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help="specify output filename [default=stdout]")
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(options, args) = parser.parse_args()
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if len(args) != 1:
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parser.print_help()
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sys.exit(1)
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elf_file = open(args[0], 'rb')
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elf_contents = elf_file.read()
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if not elf32_big_endian_exec_p(elf_contents):
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sys.stderr.write("%s: not a big-endian 32-bit ELF executable\n" % (args[0],))
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sys.exit(1)
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if options.output is None:
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sbf_file = sys.stdout
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else:
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sbf_file = open(options.output, 'wb')
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(entry, phdrs) = get_elf32_prog_headers(elf_contents)
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#pprint(phdrs, sys.stderr)
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def phdr_to_sec_desc(phdr):
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target_addr = phdr.paddr
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data = elf_contents[phdr.offset:phdr.offset+phdr.filesz]
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#print >>sys.stderr, "pdhr_to_sec_desc:", (target_addr, data)
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return sbf.sec_desc(target_addr, data)
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sections = map(phdr_to_sec_desc, phdrs)
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# pprint(sections, sys.stderr)
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sbf.write_sbf(sbf_file, sbf.header(entry, sections))
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if __name__ == '__main__':
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main()
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