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![Stephen Boyd](/assets/img/avatar_default.png)
Add "auto" to the usage message so that it's a little clearer that you can pass "auto" as the second argument. When passing "auto" the script tries to find the base path automatically instead of requiring it be passed on the commandline. Also use [<variable>] to indicate the variable argument and that it is optional so that we can differentiate from the literal "auto" that should be passed. Link: https://lkml.kernel.org/r/20210511003845.2429846-11-swboyd@chromium.org Signed-off-by: Stephen Boyd <swboyd@chromium.org> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Alexei Starovoitov <ast@kernel.org> Cc: Jessica Yu <jeyu@kernel.org> Cc: Evan Green <evgreen@chromium.org> Cc: Hsin-Yi Wang <hsinyi@chromium.org> Cc: Konstantin Khlebnikov <khlebnikov@yandex-team.ru> Cc: Sasha Levin <sashal@kernel.org> Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Cc: Baoquan He <bhe@redhat.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Dave Young <dyoung@redhat.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Petr Mladek <pmladek@suse.com> Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk> Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vivek Goyal <vgoyal@redhat.com> Cc: Will Deacon <will@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
284 lines
6.6 KiB
Bash
Executable file
284 lines
6.6 KiB
Bash
Executable file
#!/bin/bash
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# SPDX-License-Identifier: GPL-2.0
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# (c) 2014, Sasha Levin <sasha.levin@oracle.com>
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#set -x
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usage() {
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echo "Usage:"
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echo " $0 -r <release> | <vmlinux> [<base path>|auto] [<modules path>]"
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}
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if [[ $1 == "-r" ]] ; then
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vmlinux=""
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basepath="auto"
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modpath=""
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release=$2
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for fn in {,/usr/lib/debug}/boot/vmlinux-$release{,.debug} /lib/modules/$release{,/build}/vmlinux ; do
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if [ -e "$fn" ] ; then
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vmlinux=$fn
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break
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fi
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done
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if [[ $vmlinux == "" ]] ; then
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echo "ERROR! vmlinux image for release $release is not found" >&2
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usage
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exit 2
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fi
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else
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vmlinux=$1
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basepath=${2-auto}
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modpath=$3
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release=""
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debuginfod=
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# Can we use debuginfod-find?
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if type debuginfod-find >/dev/null 2>&1 ; then
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debuginfod=${1-only}
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fi
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if [[ $vmlinux == "" && -z $debuginfod ]] ; then
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echo "ERROR! vmlinux image must be specified" >&2
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usage
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exit 1
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fi
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fi
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declare -A cache
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declare -A modcache
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find_module() {
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if [[ -n $debuginfod ]] ; then
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if [[ -n $modbuildid ]] ; then
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debuginfod-find debuginfo $modbuildid && return
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fi
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# Only using debuginfod so don't try to find vmlinux module path
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if [[ $debuginfod == "only" ]] ; then
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return
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fi
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fi
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if [[ "$modpath" != "" ]] ; then
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for fn in $(find "$modpath" -name "${module//_/[-_]}.ko*") ; do
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if readelf -WS "$fn" | grep -qwF .debug_line ; then
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echo $fn
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return
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fi
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done
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return 1
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fi
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modpath=$(dirname "$vmlinux")
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find_module && return
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if [[ $release == "" ]] ; then
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release=$(gdb -ex 'print init_uts_ns.name.release' -ex 'quit' -quiet -batch "$vmlinux" 2>/dev/null | sed -n 's/\$1 = "\(.*\)".*/\1/p')
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fi
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for dn in {/usr/lib/debug,}/lib/modules/$release ; do
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if [ -e "$dn" ] ; then
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modpath="$dn"
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find_module && return
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fi
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done
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modpath=""
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return 1
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}
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parse_symbol() {
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# The structure of symbol at this point is:
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# ([name]+[offset]/[total length])
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#
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# For example:
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# do_basic_setup+0x9c/0xbf
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if [[ $module == "" ]] ; then
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local objfile=$vmlinux
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elif [[ "${modcache[$module]+isset}" == "isset" ]]; then
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local objfile=${modcache[$module]}
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else
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local objfile=$(find_module)
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if [[ $objfile == "" ]] ; then
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echo "WARNING! Modules path isn't set, but is needed to parse this symbol" >&2
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return
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fi
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modcache[$module]=$objfile
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fi
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# Remove the englobing parenthesis
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symbol=${symbol#\(}
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symbol=${symbol%\)}
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# Strip segment
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local segment
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if [[ $symbol == *:* ]] ; then
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segment=${symbol%%:*}:
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symbol=${symbol#*:}
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fi
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# Strip the symbol name so that we could look it up
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local name=${symbol%+*}
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# Use 'nm vmlinux' to figure out the base address of said symbol.
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# It's actually faster to call it every time than to load it
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# all into bash.
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if [[ "${cache[$module,$name]+isset}" == "isset" ]]; then
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local base_addr=${cache[$module,$name]}
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else
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local base_addr=$(nm "$objfile" 2>/dev/null | awk '$3 == "'$name'" && ($2 == "t" || $2 == "T") {print $1; exit}')
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if [[ $base_addr == "" ]] ; then
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# address not found
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return
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fi
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cache[$module,$name]="$base_addr"
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fi
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# Let's start doing the math to get the exact address into the
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# symbol. First, strip out the symbol total length.
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local expr=${symbol%/*}
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# Now, replace the symbol name with the base address we found
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# before.
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expr=${expr/$name/0x$base_addr}
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# Evaluate it to find the actual address
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expr=$((expr))
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local address=$(printf "%x\n" "$expr")
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# Pass it to addr2line to get filename and line number
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# Could get more than one result
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if [[ "${cache[$module,$address]+isset}" == "isset" ]]; then
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local code=${cache[$module,$address]}
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else
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local code=$(${CROSS_COMPILE}addr2line -i -e "$objfile" "$address" 2>/dev/null)
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cache[$module,$address]=$code
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fi
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# addr2line doesn't return a proper error code if it fails, so
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# we detect it using the value it prints so that we could preserve
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# the offset/size into the function and bail out
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if [[ $code == "??:0" ]]; then
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return
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fi
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# Strip out the base of the path on each line
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code=$(while read -r line; do echo "${line#$basepath/}"; done <<< "$code")
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# In the case of inlines, move everything to same line
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code=${code//$'\n'/' '}
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# Replace old address with pretty line numbers
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symbol="$segment$name ($code)"
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}
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debuginfod_get_vmlinux() {
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local vmlinux_buildid=${1##* }
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if [[ $vmlinux != "" ]]; then
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return
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fi
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if [[ $vmlinux_buildid =~ ^[0-9a-f]+ ]]; then
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vmlinux=$(debuginfod-find debuginfo $vmlinux_buildid)
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if [[ $? -ne 0 ]] ; then
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echo "ERROR! vmlinux image not found via debuginfod-find" >&2
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usage
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exit 2
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fi
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return
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fi
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echo "ERROR! Build ID for vmlinux not found. Try passing -r or specifying vmlinux" >&2
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usage
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exit 2
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}
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decode_code() {
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local scripts=`dirname "${BASH_SOURCE[0]}"`
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echo "$1" | $scripts/decodecode
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}
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handle_line() {
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if [[ $basepath == "auto" && $vmlinux != "" ]] ; then
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module=""
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symbol="kernel_init+0x0/0x0"
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parse_symbol
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basepath=${symbol#kernel_init (}
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basepath=${basepath%/init/main.c:*)}
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fi
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local words
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# Tokenize
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read -a words <<<"$1"
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# Remove hex numbers. Do it ourselves until it happens in the
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# kernel
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# We need to know the index of the last element before we
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# remove elements because arrays are sparse
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local last=$(( ${#words[@]} - 1 ))
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for i in "${!words[@]}"; do
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# Remove the address
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if [[ ${words[$i]} =~ \[\<([^]]+)\>\] ]]; then
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unset words[$i]
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fi
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# Format timestamps with tabs
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if [[ ${words[$i]} == \[ && ${words[$i+1]} == *\] ]]; then
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unset words[$i]
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words[$i+1]=$(printf "[%13s\n" "${words[$i+1]}")
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fi
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done
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if [[ ${words[$last]} =~ ^[0-9a-f]+\] ]]; then
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words[$last-1]="${words[$last-1]} ${words[$last]}"
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unset words[$last]
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last=$(( $last - 1 ))
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fi
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if [[ ${words[$last]} =~ \[([^]]+)\] ]]; then
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module=${words[$last]}
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module=${module#\[}
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module=${module%\]}
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modbuildid=${module#* }
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module=${module% *}
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if [[ $modbuildid == $module ]]; then
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modbuildid=
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fi
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symbol=${words[$last-1]}
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unset words[$last-1]
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else
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# The symbol is the last element, process it
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symbol=${words[$last]}
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module=
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modbuildid=
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fi
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unset words[$last]
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parse_symbol # modifies $symbol
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# Add up the line number to the symbol
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echo "${words[@]}" "$symbol $module"
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}
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while read line; do
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# Let's see if we have an address in the line
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if [[ $line =~ \[\<([^]]+)\>\] ]] ||
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[[ $line =~ [^+\ ]+\+0x[0-9a-f]+/0x[0-9a-f]+ ]]; then
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# Translate address to line numbers
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handle_line "$line"
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# Is it a code line?
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elif [[ $line == *Code:* ]]; then
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decode_code "$line"
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# Is it a version line?
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elif [[ -n $debuginfod && $line =~ PID:\ [0-9]+\ Comm: ]]; then
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debuginfod_get_vmlinux "$line"
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else
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# Nothing special in this line, show it as is
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echo "$line"
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fi
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done
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