remove obsolete kernel debugging script
For quite some time kgdb has been internally handling FreeBSD kernel module state; add-on scripts and tools are not needed. asf(8) served a similar purpose to this script and was removed in r335222. PR: 229046 Reported by: jhb Sponsored by: The FreeBSD Foundation
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#!/usr/local/bin/python
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#
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# Copyright 2004 John-Mark Gurney
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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# SUCH DAMAGE.
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#
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# $FreeBSD$
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from __future__ import print_function
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import sys
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import os
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import popen2
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import re
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gdb_cmd = 'kgdb %(p)s/kernel.debug %(core)s | tee /tmp/gdb.log'
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#GDB regex
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filenamere = re.compile(r'filename\s+=\s+0x[0-9a-f]+\s("(?P<fn>[^"]+)"|(?P<error><[^>]*>))', re.M)
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addressre = re.compile(r'address\s+=\s+(?P<ad>0x[0-9a-f]+)', re.M)
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nextre = re.compile(r'tqe_next\s+=\s+(?P<ad>0x[0-9a-f]+)', re.M)
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printre = re.compile(r'\$\d+\s+=\s+')
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#Paths to search for ko's/debugs
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kld_debug_paths = []
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if len(sys.argv[1:]) < 2:
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print('Usage: prog <kerncomp> <core> [<paths>]')
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sys.exit(1)
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#Get the base modules path
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pfs = sys.argv[1].split('/')
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try:
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i = 0
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while 1:
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i = i + pfs[i:].index('sys') + 1
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except:
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pass
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if i == -1:
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sys.stderr.write("No sys dir in kernel source path: %s\n" % sys.argv[1])
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sys.exit(0)
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kld_debug_paths.append('/'.join(pfs[:i] + ['modules']))
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kld_debug_paths.append(sys.argv[1])
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#kld_debug_paths.append(sys.argv[3:])
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gdb_cmd = gdb_cmd % {'p': sys.argv[1], 'core': sys.argv[2] }
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#Start gdb
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gdb = popen2.popen4(gdb_cmd)
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def searchfor(inp, re, j = 0, l = None):
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"""searchfor(inp, re, j, l): Searches for regex re in inp. It will
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automatically add more lines. If j is set, the lines will be joined together.
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l can provide a starting line to help search against. Return value is a
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tuple of the last line, and the match if any."""
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ret = None
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if not l:
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l = inp.readline()
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ret = re.search(l)
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while l and not ret:
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if j:
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l += inp.readline()
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else:
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l = inp.readline()
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ret = re.search(l)
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return (l, ret)
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def get_addresses(inp, out):
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"""get_addresses(inp, out): It will search for addresses from gdb.
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inp and out, are the gdb input and output respectively. Return value is
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a list of tuples. The tuples contain the filename and the address the
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filename was loaded."""
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addr = []
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nxad = 1
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while nxad:
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if nxad == 1:
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out.write("print linker_files.tqh_first[0]\n")
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else:
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out.write("print *(struct linker_file *)%d\n" % nxad)
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out.flush()
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l = searchfor(inp, printre)[0]
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l, fn = searchfor(inp, filenamere, 1, l)
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if not fn.group('fn'):
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sys.stderr.write("got error: %s\n" % fn.group('error'))
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nxad = 0
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else:
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l, ad = searchfor(inp, addressre, 1, l)
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l, nx = searchfor(inp, nextre, 1, l)
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addr.append((fn.group('fn'), long(ad.group('ad'), 16)))
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nxad = long(nx.group('ad'), 16)
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return addr
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#Get the addresses
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addr = get_addresses(gdb[0], gdb[1])
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#Pass through the resulting addresses, skipping the kernel.
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for i in addr[1:]:
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for j in kld_debug_paths:
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#Try .debug first.
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p = popen2.popen4('find %s -type f -name "%s.debug"' % (j, i[0]))[0].read().strip()
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if p:
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break
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#Try just .ko if .debug wasn't found.
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p = popen2.popen4('find %s -type f -name "%s"' % (j, i[0]))[0].read().strip()
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if p:
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break
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if not p:
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#Tell our user that we couldn't find it.
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a = i[1]
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sys.stderr.write("Can't find module: %s (addr: %d + header)\n" % (i[0], a))
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print('#add-symbol-file <file>', a, '#add header')
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continue
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#j = popen2.popen4('objdump --section-headers /boot/kernel/%s | grep "\.text"' % i[0])[0].read().strip().split()
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#Output the necessary information
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j = popen2.popen4('objdump --section-headers "%s" | grep "\.text"' % p)[0].read().strip().split()
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try:
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a = int(j[5], 16)
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print('add-symbol-file', p, i[1] + a)
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except IndexError:
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sys.stderr.write('Bad file: %s, address: %d\n' % (i[0], i[1]))
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