Create symbol file from kallsyms

README.md

Generate symbol file:

python kernel_syms.py
as -o kernal_syms.o kernel_syms.s

Load the symbols into gdb:

# in gdb
symbol-file kernel_syms.o

kernel_syms.py

#!/usr/bin/env python3

import re

infos = dict()

with open('kallsyms', 'rt') as syms_fd, open('kernel_syms.s', 'wt') as out_fd:
    out_fd.write('.text\n')
    syms = syms_fd.read()
    for line in syms.split('\n'):
        info = re.search(r'^(?P<addr>[0-9a-fA-F]+) . (?P<sym>\w+)', line)
        if info:
            addr, sym = info.groups()
            addr = int(addr, 16)
            if sym not in infos:
                infos[sym] = addr
    
    infos = dict(sorted(infos.items(), key=lambda item: item[1]))
    for sym, addr in infos.items():
        out_fd.write(f'\t.org 0x{addr:x}\n{sym}:\n')