diff options
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/debugscripts/README | 5 | ||||
| -rw-r--r-- | tools/debugscripts/kgdb | 65 | ||||
| -rw-r--r-- | tools/debugscripts/kld_deb.py | 143 |
3 files changed, 213 insertions, 0 deletions
diff --git a/tools/debugscripts/README b/tools/debugscripts/README index 732d3c2..bd28cdc 100644 --- a/tools/debugscripts/README +++ b/tools/debugscripts/README @@ -14,3 +14,8 @@ perform kernel debugging, you would do: (kgdb) +This directory also contains a kgdb script that given a crash dump number +automaticly extract the path to the kernel source, run gdb to extract +information about kernel modules loaded, and then rerun gdb loading the +necessary symbols for the modules. You need to make sure you build the +modules w/ debugging symbols seperately to get things to work. diff --git a/tools/debugscripts/kgdb b/tools/debugscripts/kgdb new file mode 100644 index 0000000..2293c5b --- /dev/null +++ b/tools/debugscripts/kgdb @@ -0,0 +1,65 @@ +#!/bin/sh - +# +# Copyright 2004 John-Mark Gurney +# All rights reserved. +# +# Redistribution and use in source and binary forms, with or without +# modification, are permitted provided that the following conditions +# are met: +# 1. Redistributions of source code must retain the above copyright +# notice, this list of conditions and the following disclaimer. +# 2. Redistributions in binary form must reproduce the above copyright +# notice, this list of conditions and the following disclaimer in the +# documentation and/or other materials provided with the distribution. +# +# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND +# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE +# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE +# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE +# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL +# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS +# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) +# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT +# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY +# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF +# SUCH DAMAGE. +# +# $FreeBSD$ + +crashpath="/var/crash" +kld_debpy="kld_deb.py" + +if [ x"$1" = x"-?" -o x"$1" = x"-h" ]; then + echo "Usage: $0 <corenum> [ <gdbcmdfile> [ <modulepaths> ] ]" + echo "" + echo "Path for crash dumps: $crashpath" + exit 1 +fi + +if [ x"$1" = x"" ]; then + echo "Need core number." + exit 1 +fi +corenum="$1" +shift + +cmd_file="" +if [ x"$2" != x"" ]; then + cmd_file="-x $2" + shift +fi + +core="$crashpath/vmcore.$corenum" +info="$crashpath/info.$corenum" + +#Get the kernel source compile dir from the info file +kernsrc="`awk 'i == 1 { split($0, a, ":"); print a[2]; i = 0 } $1 == "Versionstring:" { i = 1 }' < "$info"`" + +tmpfile="/tmp/kgdb.asf.$$" +# -mapped (broken?) +# -x command_file +echo "Kernel Source: $kernsrc" +echo "Getting KLD information and locations..." +python $kld_debpy "$kernsrc" "$core" $@ > "$tmpfile" && +gdb $cmd_file -x "$tmpfile" -k -cd "$kernsrc" -s "$kernsrc/kernel.debug" -e "$kernsrc/kernel" -c "$core" +rm "$tmpfile" diff --git a/tools/debugscripts/kld_deb.py b/tools/debugscripts/kld_deb.py new file mode 100644 index 0000000..3d8e01d --- /dev/null +++ b/tools/debugscripts/kld_deb.py @@ -0,0 +1,143 @@ +#!/usr/local/bin/python +# +# Copyright 2004 John-Mark Gurney +# All rights reserved. +# +# Redistribution and use in source and binary forms, with or without +# modification, are permitted provided that the following conditions +# are met: +# 1. Redistributions of source code must retain the above copyright +# notice, this list of conditions and the following disclaimer. +# 2. Redistributions in binary form must reproduce the above copyright +# notice, this list of conditions and the following disclaimer in the +# documentation and/or other materials provided with the distribution. +# +# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND +# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE +# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE +# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE +# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL +# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS +# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) +# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT +# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY +# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF +# SUCH DAMAGE. +# +# $FreeBSD$ + +import sys +import os +import popen2 +import re + +gdb_cmd = 'gdb -q -k -s %(p)s/kernel.debug -e %(p)s/kernel' +#GDB regex +filenamere = re.compile(r'filename\s+=\s+0x[0-9a-f]+\s("(?P<fn>[^"]+)"|(?P<error><[^>]*>))', re.M) +addressre = re.compile(r'address\s+=\s+(?P<ad>0x[0-9a-f]+)', re.M) +nextre = re.compile(r'tqe_next\s+=\s+(?P<ad>0x[0-9a-f]+)', re.M) +printre = re.compile(r'\$\d+\s+=\s+') + +#Paths to search for ko's/debugs +kld_debug_paths = [] + +if len(sys.argv[1:]) < 2: + print 'Usage: prog <kerncomp> <core> [<paths>]' + sys.exit(1) + +#Get the base modules path +pfs = sys.argv[1].split('/') +try: + i = 0 + while 1: + i = i + pfs[i:].index('sys') + 1 +except: + pass + +if i == -1: + sys.stderr.write("No sys dir in kernel source path: %s\n" % sys.argv[1]) + sys.exit(0) + +kld_debug_paths.append('/'.join(pfs[:i] + ['modules'])) +kld_debug_paths.append(sys.argv[1]) +#kld_debug_paths.append(sys.argv[3:]) +gdb_cmd = gdb_cmd % {'p': sys.argv[1] } +gdb_cmd += ' -c %s | tee /tmp/gdb.log' % sys.argv[2] + +#Start gdb +gdb = popen2.popen4(gdb_cmd) + +def searchfor(inp, re, j = 0, l = None): + """searchfor(inp, re, j, l): Searches for regex re in inp. It will +automaticly add more lines. If j is set, the lines will be joined together. +l can provide a starting line to help search against. Return value is a +tupple of the last line, and the match if any.""" + ret = None + if not l: + l = inp.readline() + ret = re.search(l) + while l and not ret: + if j: + l += inp.readline() + else: + l = inp.readline() + ret = re.search(l) + + return (l, ret) + +def get_addresses(inp, out): + """get_addresses(inp, out): It will search for addresses from gdb. +inp and out, are the gdb input and output respectively. Return value is +a list of tupples. The tupples contain the filename and the address the +filename was loaded.""" + addr = [] + nxad = 1 + while nxad: + if nxad == 1: + out.write("print linker_files.tqh_first[0]\n") + else: + out.write("print *(struct linker_file *)%d\n" % nxad) + out.flush() + l = searchfor(inp, printre)[0] + l, fn = searchfor(inp, filenamere, 1, l) + if not fn.group('fn'): + sys.stderr.write("got error: %s\n" % fn.group('error')) + nxad = 0 + else: + l, ad = searchfor(inp, addressre, 1, l) + l, nx = searchfor(inp, nextre, 1, l) + addr.append((fn.group('fn'), long(ad.group('ad'), 16))) + nxad = long(nx.group('ad'), 16) + + return addr + +#Get the addresses +addr = get_addresses(gdb[0], gdb[1]) + +#Pass through the resulting addresses, skipping the kernel. +for i in addr[1:]: + for j in kld_debug_paths: + #Try .debug first. + p = popen2.popen4('find %s -type f -name "%s.debug"' % (j, i[0]))[0].read().strip() + if p: + break + #Try just .ko if .debug wasn't found. + p = popen2.popen4('find %s -type f -name "%s"' % (j, i[0]))[0].read().strip() + if p: + break + + if not p: + #Tell our user that we couldn't find it. + a = i[1] + sys.stderr.write("Can't find module: %s (addr: %d + header)\n" % (i[0], a)) + print '#add-symbol-file <file>', a, '#add header' + continue + + #j = popen2.popen4('objdump --section-headers /boot/kernel/%s | grep "\.text"' % i[0])[0].read().strip().split() + #Output the necessary information + j = popen2.popen4('objdump --section-headers "%s" | grep "\.text"' % p)[0].read().strip().split() + try: + a = int(j[5], 16) + print 'add-symbol-file', p, i[1] + a + except IndexError: + sys.stderr.write('Bad file: %s, address: %d\n' % (i[0], i[1])) |
