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scripts/faddr2line: Reduce number of readelf calls to three

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Rather than calling readelf several times for each invocation of
__faddr2line, call readelf only three times at the beginning, and save its
result for future use.

Signed-off-by: Brian Johannesmeyer <bjohannesmeyer@gmail.com>
Link: https://lore.kernel.org/r/20240415145538.1938745-2-bjohannesmeyer@gmail.com
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
This commit is contained in:
Brian Johannesmeyer 2024-04-15 16:55:32 +02:00 committed by Josh Poimboeuf
parent 22a40d14b5
commit 39cf650d68
1 changed files with 17 additions and 9 deletions
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26
scripts/faddr2line
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@ -87,7 +87,7 @@ command -v ${ADDR2LINE} >/dev/null 2>&1 || die "${ADDR2LINE} isn't installed"
find_dir_prefix() {
local objfile=$1
local start_kernel_addr=$(${READELF} --symbols --wide $objfile | sed 's/\[.*\]//' |
local start_kernel_addr=$(echo "${ELF_SYMS}" | sed 's/\[.*\]//' |
${AWK} '$8 == "start_kernel" {printf "0x%s", $2}')
[[ -z $start_kernel_addr ]] && return
@ -103,6 +103,14 @@ find_dir_prefix() {
return 0
}
run_readelf() {
local objfile=$1
ELF_FILEHEADER=$(${READELF} --file-header $objfile)
ELF_SECHEADERS=$(${READELF} --section-headers --wide $objfile)
ELF_SYMS=$(${READELF} --symbols --wide $objfile)
}
__faddr2line() {
local objfile=$1
local func_addr=$2
@ -125,7 +133,7 @@ __faddr2line() {
# vmlinux uses absolute addresses in the section table rather than
# section offsets.
local file_type=$(${READELF} --file-header $objfile |
local file_type=$(echo "${ELF_FILEHEADER}" |
${AWK} '$1 == "Type:" { print $2; exit }')
if [[ $file_type = "EXEC" ]] || [[ $file_type == "DYN" ]]; then
is_vmlinux=1
@ -143,8 +151,7 @@ __faddr2line() {
local sec_name
# Get the section size:
sec_size=$(${READELF} --section-headers --wide $objfile |
sed 's/\[ /\[/' |
sec_size=$(echo "${ELF_SECHEADERS}" | sed 's/\[ /\[/' |
${AWK} -v sec=$sym_sec '$1 == "[" sec "]" { print "0x" $6; exit }')
if [[ -z $sec_size ]]; then
@ -154,8 +161,7 @@ __faddr2line() {
fi
# Get the section name:
sec_name=$(${READELF} --section-headers --wide $objfile |
sed 's/\[ /\[/' |
sec_name=$(echo "${ELF_SECHEADERS}" | sed 's/\[ /\[/' |
${AWK} -v sec=$sym_sec '$1 == "[" sec "]" { print $2; exit }')
if [[ -z $sec_name ]]; then
@ -197,7 +203,7 @@ __faddr2line() {
found=2
break
fi
done < <(${READELF} --symbols --wide $objfile | sed 's/\[.*\]//' | ${AWK} -v sec=$sym_sec '$7 == sec' | sort --key=2)
done < <(echo "${ELF_SYMS}" | sed 's/\[.*\]//' | ${AWK} -v sec=$sym_sec '$7 == sec' | sort --key=2)
if [[ $found = 0 ]]; then
warn "can't find symbol: sym_name: $sym_name sym_sec: $sym_sec sym_addr: $sym_addr sym_elf_size: $sym_elf_size"
@ -278,7 +284,7 @@ __faddr2line() {
DONE=1
done < <(${READELF} --symbols --wide $objfile | sed 's/\[.*\]//' | ${AWK} -v fn=$sym_name '$8 == fn')
done < <(echo "${ELF_SYMS}" | sed 's/\[.*\]//' | ${AWK} -v fn=$sym_name '$8 == fn')
}
[[ $# -lt 2 ]] && usage
@ -291,7 +297,9 @@ LIST=0
[[ ! -f $objfile ]] && die "can't find objfile $objfile"
shift
${READELF} --section-headers --wide $objfile | ${GREP} -q '\.debug_info' || die "CONFIG_DEBUG_INFO not enabled"
run_readelf $objfile
echo "${ELF_SECHEADERS}" | ${GREP} -q '\.debug_info' || die "CONFIG_DEBUG_INFO not enabled"
DIR_PREFIX=supercalifragilisticexpialidocious
find_dir_prefix $objfile