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318 lines
13 KiB
Python
Executable File
318 lines
13 KiB
Python
Executable File
#!/usr/bin/python
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# vim:sw=4:ts=4:et:
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# This Source Code Form is subject to the terms of the Mozilla Public
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# License, v. 2.0. If a copy of the MPL was not distributed with this
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# file, You can obtain one at http://mozilla.org/MPL/2.0/.
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# This script uses addr2line (part of binutils) to post-process the entries
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# produced by NS_FormatCodeAddress(), which on Linux often lack a function
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# name, a file name and a line number.
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import subprocess
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import sys
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import re
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import os
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import pty
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import termios
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from StringIO import StringIO
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class unbufferedLineConverter:
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"""
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Wrap a child process that responds to each line of input with one line of
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output. Uses pty to trick the child into providing unbuffered output.
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"""
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def __init__(self, command, args = []):
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pid, fd = pty.fork()
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if pid == 0:
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# We're the child. Transfer control to command.
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os.execvp(command, [command] + args)
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else:
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# Disable echoing.
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attr = termios.tcgetattr(fd)
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attr[3] = attr[3] & ~termios.ECHO
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termios.tcsetattr(fd, termios.TCSANOW, attr)
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# Set up a file()-like interface to the child process
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self.r = os.fdopen(fd, "r", 1)
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self.w = os.fdopen(os.dup(fd), "w", 1)
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def convert(self, line):
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self.w.write(line + "\n")
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return (self.r.readline().rstrip("\r\n"), self.r.readline().rstrip("\r\n"))
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@staticmethod
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def test():
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assert unbufferedLineConverter("rev").convert("123") == "321"
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assert unbufferedLineConverter("cut", ["-c3"]).convert("abcde") == "c"
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print "Pass"
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objdump_section_re = re.compile("^ [0-9a-f]* ([0-9a-f ]{8}) ([0-9a-f ]{8}) ([0-9a-f ]{8}) ([0-9a-f ]{8}).*")
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def elf_section(file, section):
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"""
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Return the requested ELF section of the file as a str, representing
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a sequence of bytes.
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"""
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# We can read the .gnu_debuglink section using either of:
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# objdump -s --section=.gnu_debuglink $file
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# readelf -x .gnu_debuglink $file
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# Since readelf prints things backwards on little-endian platforms
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# for some versions only (backwards on Fedora Core 6, forwards on
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# Fedora 7), use objdump.
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objdump = subprocess.Popen(['objdump', '-s', '--section=' + section, file],
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stdout=subprocess.PIPE,
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# redirect stderr so errors don't get printed
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stderr=subprocess.PIPE)
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(objdump_stdout, objdump_stderr) = objdump.communicate()
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if objdump.returncode != 0:
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return None
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result = ""
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# Turn hexadecimal dump into the bytes it represents
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for line in StringIO(objdump_stdout).readlines():
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m = objdump_section_re.match(line)
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if m:
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for gnum in [0, 1, 2, 3]:
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word = m.groups()[gnum]
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if word != " ":
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for idx in [0, 2, 4, 6]:
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result += chr(int(word[idx:idx+2], 16))
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return result
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# FIXME: Hard-coded to gdb defaults (works on Fedora and Ubuntu).
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global_debug_dir = '/usr/lib/debug';
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endian_re = re.compile("\s*Data:\s+.*(little|big) endian.*$")
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# Table of 256 values, per documentation of .gnu_debuglink sections.
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gnu_debuglink_crc32_table = [
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0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419,
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0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4,
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0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07,
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0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
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0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856,
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0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
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0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4,
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0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
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0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3,
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0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a,
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0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599,
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0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
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0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190,
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0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f,
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0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e,
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0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
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0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed,
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0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
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0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3,
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0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
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0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a,
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0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5,
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0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010,
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0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
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0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17,
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0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6,
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0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615,
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0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
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0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344,
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0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
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0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a,
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0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
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0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1,
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0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c,
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0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef,
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0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
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0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe,
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0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31,
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0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c,
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0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
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0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b,
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0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
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0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1,
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0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
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0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278,
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0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7,
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0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66,
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0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
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0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605,
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0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8,
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0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b,
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0x2d02ef8d
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]
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def gnu_debuglink_crc32(stream):
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# Note that python treats bitwise operators as though integers have
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# an infinite number of bits (and thus such that negative integers
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# 1-pad out to infinity).
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crc = 0xffffffff
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while True:
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# Choose to read in 4096 byte chunks.
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bytes = stream.read(4096)
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if len(bytes) == 0:
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break
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for byte in bytes:
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crc = gnu_debuglink_crc32_table[(crc ^ ord(byte)) & 0xff] ^ (crc >> 8)
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return ~crc & 0xffffffff
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def separate_debug_file_for(file):
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"""
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Finds a separated file with the debug sections for a binary. Such
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files are commonly installed by debug packages on linux distros.
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Rules for finding them are documented in:
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https://sourceware.org/gdb/current/onlinedocs/gdb/Separate-Debug-Files.html
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"""
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def have_debug_file(debugfile):
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return os.path.isfile(debugfile)
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endian = None
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readelf = subprocess.Popen(['readelf', '-h', file],
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stdout=subprocess.PIPE)
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for line in readelf.stdout.readlines():
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m = endian_re.match(line)
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if m:
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endian = m.groups()[0]
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break
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readelf.terminate()
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if endian is None:
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sys.stderr.write("Could not determine endianness of " + file + "\n")
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return None
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def word32(s):
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if type(s) != str or len(s) != 4:
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raise StandardError("expected 4 byte string input")
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s = list(s)
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if endian == "big":
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s.reverse()
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return sum(map(lambda idx: ord(s[idx]) * (256 ** idx), range(0, 4)))
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buildid = elf_section(file, ".note.gnu.build-id");
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if buildid is not None:
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# The build ID is an ELF note section, so it begins with a
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# name size (4), a description size (size of contents), a
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# type (3), and the name "GNU\0".
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note_header = buildid[0:16]
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buildid = buildid[16:]
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if word32(note_header[0:4]) != 4 or \
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word32(note_header[4:8]) != len(buildid) or \
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word32(note_header[8:12]) != 3 or \
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note_header[12:16] != "GNU\0":
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sys.stderr.write("malformed .note.gnu.build_id in " + file + "\n")
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else:
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buildid = "".join(map(lambda ch: "%02X" % ord(ch), buildid)).lower()
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f = os.path.join(global_debug_dir, ".build-id", buildid[0:2], buildid[2:] + ".debug")
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if have_debug_file(f):
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return f
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debuglink = elf_section(file, ".gnu_debuglink");
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if debuglink is not None:
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# The debuglink section contains a string, ending with a
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# null-terminator and then 0 to three bytes of padding to fill the
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# current 32-bit unit. (This padding is usually null bytes, but
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# I've seen null-null-H, on Ubuntu x86_64.) This is followed by
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# a 4-byte CRC.
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debuglink_name = debuglink[:-4]
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null_idx = debuglink_name.find("\0")
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if null_idx == -1 or null_idx + 4 < len(debuglink_name):
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sys.stderr.write("Malformed .gnu_debuglink in " + file + "\n")
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return None
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debuglink_name = debuglink_name[0:null_idx]
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debuglink_crc = word32(debuglink[-4:])
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dirname = os.path.dirname(file)
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possible_files = [
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os.path.join(dirname, debuglink_name),
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os.path.join(dirname, ".debug", debuglink_name),
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os.path.join(global_debug_dir, dirname.lstrip("/"), debuglink_name)
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]
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for f in possible_files:
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if have_debug_file(f):
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fio = open(f, mode="r")
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file_crc = gnu_debuglink_crc32(fio)
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fio.close()
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if file_crc == debuglink_crc:
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return f
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return None
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elf_type_re = re.compile("^\s*Type:\s+(\S+)")
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elf_text_section_re = re.compile("^\s*\[\s*\d+\]\s+\.text\s+\w+\s+(\w+)\s+(\w+)\s+")
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def address_adjustment_for(file):
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"""
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Return the address adjustment to use for a file.
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addr2line wants offsets relative to the base address for shared
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libraries, but it wants addresses including the base address offset
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for executables. This returns the appropriate address adjustment to
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add to an offset within file. See bug 230336.
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"""
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readelf = subprocess.Popen(['readelf', '-h', file],
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stdout=subprocess.PIPE)
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elftype = None
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for line in readelf.stdout.readlines():
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m = elf_type_re.match(line)
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if m:
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elftype = m.groups()[0]
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break
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readelf.terminate()
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if elftype != "EXEC":
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# If we're not dealing with an executable, return 0.
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return 0
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adjustment = 0
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readelf = subprocess.Popen(['readelf', '-S', file],
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stdout=subprocess.PIPE)
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for line in readelf.stdout.readlines():
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m = elf_text_section_re.match(line)
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if m:
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# Subtract the .text section's offset within the
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# file from its base address.
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adjustment = int(m.groups()[0], 16) - int(m.groups()[1], 16);
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break
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readelf.terminate()
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return adjustment
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addr2lines = {}
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def addressToSymbol(file, address):
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converter = None
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address_adjustment = None
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cache = None
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if not file in addr2lines:
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debug_file = separate_debug_file_for(file) or file
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converter = unbufferedLineConverter('/usr/bin/addr2line', ['-C', '-f', '-e', debug_file])
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address_adjustment = address_adjustment_for(file)
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cache = {}
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addr2lines[file] = (converter, address_adjustment, cache)
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else:
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(converter, address_adjustment, cache) = addr2lines[file]
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if address in cache:
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return cache[address]
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result = converter.convert(hex(int(address, 16) + address_adjustment))
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cache[address] = result
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return result
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# Matches lines produced by NS_FormatCodeAddress().
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line_re = re.compile("^(.*#\d+: )(.+)\[(.+) \+(0x[0-9A-Fa-f]+)\](.*)$")
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def fixSymbols(line):
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result = line_re.match(line)
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if result is not None:
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(before, fn, file, address, after) = result.groups()
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if os.path.exists(file) and os.path.isfile(file):
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(name, fileline) = addressToSymbol(file, address)
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# If addr2line gave us something useless, keep what we had before.
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if name == "??":
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name = fn
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if fileline == "??:0" or fileline == "??:?":
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fileline = file
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nl = '\n' if line[-1] == '\n' else ''
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return "%s%s (%s)%s%s" % (before, name, fileline, after, nl)
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else:
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sys.stderr.write("Warning: File \"" + file + "\" does not exist.\n")
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return line
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else:
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return line
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if __name__ == "__main__":
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for line in sys.stdin:
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sys.stdout.write(fixSymbols(line))
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