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scripts/decode_stacktrace.sh: handle symbols in modules 

scripts/decode_stacktrace.sh presently displays module symbols as

	func+0x0ff/0x5153 [module]

Add a third argument: the pathname of a directory where the script
should look for the file module.ko so that the output appears as

	func (foo/bar.c:123) module

Without the argument or if the module file isn't found the script prints
such symbols as is without decoding.

Signed-off-by: Konstantin Khlebnikov <koct9i@gmail.com>
Cc: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Konstantin Khlebnikov 2016-05-19 17:09:11 -07:00 committed by Linus Torvalds
parent 8e4f70e218
commit 310c6dd06a
1 changed files with 39 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

55
scripts/decode_stacktrace.sh
View File

@ -2,15 +2,17 @@
# (c) 2014, Sasha Levin <sasha.levin@oracle.com>
#set -x
if [[ $# != 2 ]]; then
if [[ $# < 2 ]]; then
echo "Usage:"
echo " $0 [vmlinux] [base path]"
echo " $0 [vmlinux] [base path] [modules path]"
exit 1
fi
vmlinux=$1
basepath=$2
modpath=$3
declare -A cache
declare -A modcache
parse_symbol() {
# The structure of symbol at this point is:
@ -19,6 +21,17 @@ parse_symbol() {
# For example:
# do_basic_setup+0x9c/0xbf
if [[ $module == "" ]] ; then
local objfile=$vmlinux
elif [[ "${modcache[$module]+isset}" == "isset" ]]; then
local objfile=${modcache[$module]}
else
[[ $modpath == "" ]] && return
local objfile=$(find "$modpath" -name $module.ko -print -quit)
[[ $objfile == "" ]] && return
modcache[$module]=$objfile
fi
# Remove the englobing parenthesis
symbol=${symbol#\(}
symbol=${symbol%\)}
@ -29,11 +42,11 @@ parse_symbol() {
# Use 'nm vmlinux' to figure out the base address of said symbol.
# It's actually faster to call it every time than to load it
# all into bash.
if [[ "${cache[$name]+isset}" == "isset" ]]; then
local base_addr=${cache[$name]}
if [[ "${cache[$module,$name]+isset}" == "isset" ]]; then
local base_addr=${cache[$module,$name]}
else
local base_addr=$(nm "$vmlinux" | grep -i ' t ' | awk "/ $name\$/ {print \$1}" | head -n1)
cache["$name"]="$base_addr"
local base_addr=$(nm "$objfile" | grep -i ' t ' | awk "/ $name\$/ {print \$1}" | head -n1)
cache[$module,$name]="$base_addr"
fi
# Let's start doing the math to get the exact address into the
# symbol. First, strip out the symbol total length.
@ -48,12 +61,12 @@ parse_symbol() {
local address=$(printf "%x\n" "$expr")
# Pass it to addr2line to get filename and line number
# Could get more than one result
if [[ "${cache[$address]+isset}" == "isset" ]]; then
local code=${cache[$address]}
# Could get more than one result
if [[ "${cache[$module,$address]+isset}" == "isset" ]]; then
local code=${cache[$module,$address]}
else
local code=$(addr2line -i -e "$vmlinux" "$address")
cache[$address]=$code
local code=$(addr2line -i -e "$objfile" "$address")
cache[$module,$address]=$code
fi
# addr2line doesn't return a proper error code if it fails, so
@ -105,13 +118,23 @@ handle_line() {
fi
done
# The symbol is the last element, process it
symbol=${words[$last]}
if [[ ${words[$last]} =~ \[([^]]+)\] ]]; then
module=${words[$last]}
module=${module#\[}
module=${module%\]}
symbol=${words[$last-1]}
unset words[$last-1]
else
# The symbol is the last element, process it
symbol=${words[$last]}
module=
fi
unset words[$last]
parse_symbol # modifies $symbol
# Add up the line number to the symbol
echo "${words[@]}" "$symbol"
echo "${words[@]}" "$symbol $module"
}
while read line; do
@ -121,8 +144,8 @@ while read line; do
handle_line "$line"
# Is it a code line?
elif [[ $line == *Code:* ]]; then
decode_code "$line"
else
decode_code "$line"
else
# Nothing special in this line, show it as is
echo "$line"
fi