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https://github.com/JakeHillion/drgn.git
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acbf14d10c
Most of drgn.dwarf is not performance-sensitive, and the part that is (DwarfIndex) can use some extra tuning which is easier to do in C rather than Cython.
93 lines
2.5 KiB
Python
93 lines
2.5 KiB
Python
import code
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import argparse
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import glob
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import os.path
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import platform
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import runpy
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import sys
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from drgn.coredump import Coredump
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from drgn.dwarfindex import DwarfIndex
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from drgn.util import parse_symbol_file
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def find_vmlinux(release):
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paths = [
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f'/usr/lib/debug/lib/modules/{release}/vmlinux',
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f'/boot/vmlinux-{release}',
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f'/lib/modules/{release}/build/vmlinux',
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]
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for path in paths:
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if os.path.exists(path):
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return path
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else:
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raise ValueError()
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def find_modules(release):
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patterns = [
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f'/usr/lib/debug/lib/modules/{release}/kernel/**/*.ko.debug',
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f'/lib/modules/{release}/kernel/**/*.ko',
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]
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for pattern in patterns:
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paths = glob.glob(pattern, recursive=True)
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if paths:
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return paths
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else:
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return []
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def main():
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parser = argparse.ArgumentParser(prog='drgn')
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parser.add_argument(
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'-k', '--kernel', action='store_true',
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help='debug the kernel instead of a userspace program')
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parser.add_argument(
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'-e', '--executable', metavar='PATH', type=str,
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help='use the given executable file')
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parser.add_argument(
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'script', metavar='ARG', type=str, nargs='*',
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help='script to execute instead of running an interactive shell')
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args = parser.parse_args()
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if not args.kernel:
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sys.exit('Only --kernel mode is currently implemented')
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release = platform.release()
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if args.executable is None:
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try:
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args.executable = find_vmlinux(release)
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except ValueError:
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sys.exit('Could not find vmlinux file; install the proper debuginfo package or use --executable')
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paths = find_modules(release)
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if not paths and not args.script:
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print('Could not find kernel modules; continuing anyways',
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file=sys.stderr)
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paths.append(args.executable)
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if not args.script:
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print('Reading symbols...')
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dwarf_index = DwarfIndex(paths)
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with open('/proc/kallsyms', 'r') as f:
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symbols = parse_symbol_file(f)
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with open('/proc/kcore', 'rb') as core_file:
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core = Coredump(core_file, dwarf_index, symbols)
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if args.script:
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sys.argv = args.script
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runpy.run_path(args.script[0], init_globals={'core': core},
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run_name='__main__')
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else:
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code.interact(banner='', exitmsg='', local={
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'core': core,
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'__name__': '__name__',
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'__doc__': None,
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})
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if __name__ == '__main__':
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main()
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