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from elftools.elf.elffile import ELFFile
from os import path
class DebugUserland(gdb.Command):
def __init__(self):
super(DebugUserland, self).__init__("debug-userland", gdb.COMMAND_USER)
def invoke(self, arg, from_tty):
directory = 'user/usr/bin/'
filename = directory + arg + '.exec'
if not path.exists(filename):
filename = 'user/bin/' + arg + '.exec'
if arg == 'init':
filename = 'user/sbin/init.exec'
elf = ELFFile(open(filename, 'rb'))
text_section = elf.get_section_by_name('.text')
entry = text_section.header.sh_addr
gdb.execute(f"add-symbol-file {filename} {entry}")
symtab = elf.get_section_by_name('.symtab')
main = symtab.get_symbol_by_name('main')[0]
main_addr = main.entry.st_value
gdb.execute(f"break *{main_addr}")
DebugUserland()
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