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80 lines
2.6 KiB
Python
Executable File
80 lines
2.6 KiB
Python
Executable File
#!/usr/bin/python
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from __future__ import print_function
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import argparse
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import subprocess
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import re
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import sys
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from macholib.MachO import MachO
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from macholib.SymbolTable import SymbolTable
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from macholib.ptypes import *
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from macholib import mach_o
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import macholib
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class build_version_command(Structure):
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_fields_ = (
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('platform', p_uint32),
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('minos', p_uint32),
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('sdk', p_uint32),
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('ntools', p_uint32))
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if 0x32 not in mach_o.LC_REGISTRY:
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mach_o.LC_REGISTRY[0x32] = build_version_command
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parser = argparse.ArgumentParser()
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parser.add_argument("dylib")
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args = parser.parse_args()
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macho = MachO(args.dylib)
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syms = None
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for header_index, header in enumerate(macho.headers):
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try:
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symtab = SymbolTable(macho, header=header)
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except TypeError:
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if syms is None:
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# There's a bug in older versions of macholib, fall back on nm
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print("warning: buggy macholib, falling back on nm", file=sys.stderr)
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proc = subprocess.Popen(['nm', '-arch', 'all', args.dylib], stdout=subprocess.PIPE)
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(out, err) = proc.communicate()
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if proc.wait() != 0:
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raise Exception("nm failed")
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syms = list()
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for line in out.splitlines():
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m = re.match(r'([0-9a-fA-F]+)\s+a\s+page_max_size\s*$', line)
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if m:
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syms.append(int(m.group(1), 16))
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if len(syms) == 0:
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raise Exception("didn't find symbol named 'page_max_size'")
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if len(syms) != len(macho.headers):
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raise Exception("didn't find one 'page_max_size' symbol per arch")
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PAGE_MAX_SIZE = syms[header_index]
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else:
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for nlist, name in symtab.nlists:
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if name == 'page_max_size':
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PAGE_MAX_SIZE = nlist.n_value
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break
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else:
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raise Exception("didn't find symbol named 'page_max_size'")
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for lc, cmd, data in header.commands:
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if lc.cmd == mach_o.LC_SEGMENT_64:
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if cmd.segname.rstrip('\x00') == "__TEXT":
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if cmd.vmsize != 2 * PAGE_MAX_SIZE:
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raise Exception("__TEXT segment size is wrong")
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if len(data) != 1:
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raise Exception("__TEXT segment has more than one section")
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sect = data[0]
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if sect.addr != PAGE_MAX_SIZE:
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raise Exception("__text section has wrong address")
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if sect.size != PAGE_MAX_SIZE:
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raise Exception("__text section has wrong size")
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break
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else:
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raise Exception("no __TEXT segment!")
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