GDB script: load symbols from all executable objects mapped in memory, automatically.

autosym.py

import re
import subprocess

pid = gdb.selected_inferior().pid
maps_path = "/proc/%d/maps" % pid

maps_lines = open(maps_path).read().split("\n")

for line in maps_lines:
    memrange, perms, offset, devnum, size, path = (None, None, None, None, None, None)

    try:
        memrange, perms, offset, devnum, size, path = re.split("\s+", line)
    except:
        continue

    # exclude [vdso], [vsyscall], etc.
    if re.match("^\[.*\]$", path):
        continue
    # exclude non-executable segments
    if perms[2] != "x":
        continue

    if path == "":
        continue

    lines = subprocess.check_output(["readelf", "--sections", path]).decode("utf-8").split("\n")

    addr = None
    for line in lines:
        if re.match(".*\[[0-9 ]+\].*\.text", line):
            tokens = re.split("\s+", line.strip())
            addr = int(tokens[len(tokens)-2], 16)
            break

    if addr != None:
        memstart = int(memrange.split("-")[0], 16)
        offset = int(offset, 16)
        textaddress = memstart - offset + addr

        cmd = "add-symbol-file %s 0x%x" % (path, textaddress)
        gdb.execute(cmd)