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update faddr2line

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This commit is contained in:
Robbe Derks
2021-11-22 17:31:04 +01:00
committed by Willem Melching
parent b7163b56f4
commit 6a1ab7081f
1 changed files with 64 additions and 19 deletions
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83
scripts/faddr2line
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@@ -1,4 +1,5 @@
#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
#
# Translate stack dump function offsets.
#
@@ -43,12 +44,19 @@
set -o errexit
set -o nounset
READELF="${CROSS_COMPILE:-}readelf"
ADDR2LINE="${CROSS_COMPILE:-}addr2line"
SIZE="${CROSS_COMPILE:-}size"
NM="${CROSS_COMPILE:-}nm"
command -v awk >/dev/null 2>&1 || die "awk isn't installed"
command -v readelf >/dev/null 2>&1 || die "readelf isn't installed"
command -v addr2line >/dev/null 2>&1 || die "addr2line isn't installed"
command -v ${READELF} >/dev/null 2>&1 || die "readelf isn't installed"
command -v ${ADDR2LINE} >/dev/null 2>&1 || die "addr2line isn't installed"
command -v ${SIZE} >/dev/null 2>&1 || die "size isn't installed"
command -v ${NM} >/dev/null 2>&1 || die "nm isn't installed"
usage() {
echo "usage: faddr2line <object file> <func+offset> <func+offset>..." >&2
echo "usage: faddr2line [--list] <object file> <func+offset> <func+offset>..." >&2
exit 1
}
@@ -63,15 +71,15 @@ die() {
# Try to figure out the source directory prefix so we can remove it from the
# addr2line output. HACK ALERT: This assumes that start_kernel() is in
# kernel/init.c! This only works for vmlinux. Otherwise it falls back to
# init/main.c! This only works for vmlinux. Otherwise it falls back to
# printing the absolute path.
find_dir_prefix() {
local objfile=$1
local start_kernel_addr=$(readelf -sW $objfile | awk '$8 == "start_kernel" {printf "0x%s", $2}')
local start_kernel_addr=$(${READELF} -sW $objfile | awk '$8 == "start_kernel" {printf "0x%s", $2}')
[[ -z $start_kernel_addr ]] && return
local file_line=$(addr2line -e $objfile $start_kernel_addr)
local file_line=$(${ADDR2LINE} -e $objfile $start_kernel_addr)
[[ -z $file_line ]] && return
local prefix=${file_line%init/main.c:*}
@@ -103,11 +111,21 @@ __faddr2line() {
# Go through each of the object's symbols which match the func name.
# In rare cases there might be duplicates.
file_end=$(${SIZE} -Ax $objfile | awk '$1 == ".text" {print $2}')
while read symbol; do
local fields=($symbol)
local sym_base=0x${fields[1]}
local sym_size=${fields[2]}
local sym_type=${fields[3]}
local sym_base=0x${fields[0]}
local sym_type=${fields[1]}
local sym_end=${fields[3]}
# calculate the size
local sym_size=$(($sym_end - $sym_base))
if [[ -z $sym_size ]] || [[ $sym_size -le 0 ]]; then
warn "bad symbol size: base: $sym_base end: $sym_end"
DONE=1
return
fi
sym_size=0x$(printf %x $sym_size)
# calculate the address
local addr=$(($sym_base + $offset))
@@ -116,26 +134,26 @@ __faddr2line() {
DONE=1
return
fi
local hexaddr=0x$(printf %x $addr)
addr=0x$(printf %x $addr)
# weed out non-function symbols
if [[ $sym_type != "FUNC" ]]; then
if [[ $sym_type != t ]] && [[ $sym_type != T ]]; then
[[ $print_warnings = 1 ]] &&
echo "skipping $func address at $hexaddr due to non-function symbol"
echo "skipping $func address at $addr due to non-function symbol of type '$sym_type'"
continue
fi
# if the user provided a size, make sure it matches the symbol's size
if [[ -n $size ]] && [[ $size -ne $sym_size ]]; then
[[ $print_warnings = 1 ]] &&
echo "skipping $func address at $hexaddr due to size mismatch ($size != $sym_size)"
echo "skipping $func address at $addr due to size mismatch ($size != $sym_size)"
continue;
fi
# make sure the provided offset is within the symbol's range
if [[ $offset -gt $sym_size ]]; then
[[ $print_warnings = 1 ]] &&
echo "skipping $func address at $hexaddr due to size mismatch ($offset > $sym_size)"
echo "skipping $func address at $addr due to size mismatch ($offset > $sym_size)"
continue
fi
@@ -143,17 +161,44 @@ __faddr2line() {
[[ $FIRST = 0 ]] && echo
FIRST=0
local hexsize=0x$(printf %x $sym_size)
echo "$func+$offset/$hexsize:"
addr2line -fpie $objfile $hexaddr | sed "s; $dir_prefix\(\./\)*; ;"
# pass real address to addr2line
echo "$func+$offset/$sym_size:"
local file_lines=$(${ADDR2LINE} -fpie $objfile $addr | sed "s; $dir_prefix\(\./\)*; ;")
[[ -z $file_lines ]] && return
if [[ $LIST = 0 ]]; then
echo "$file_lines" | while read -r line
do
echo $line
done
DONE=1;
return
fi
# show each line with context
echo "$file_lines" | while read -r line
do
echo
echo $line
n=$(echo $line | sed 's/.*:\([0-9]\+\).*/\1/g')
n1=$[$n-5]
n2=$[$n+5]
f=$(echo $line | sed 's/.*at \(.\+\):.*/\1/g')
awk 'NR>=strtonum("'$n1'") && NR<=strtonum("'$n2'") { if (NR=='$n') printf(">%d<", NR); else printf(" %d ", NR); printf("\t%s\n", $0)}' $f
done
DONE=1
done < <(readelf -sW $objfile | awk -v f=$func '$8 == f {print}')
done < <(${NM} -n $objfile | awk -v fn=$func -v end=$file_end '$3 == fn { found=1; line=$0; start=$1; next } found == 1 { found=0; print line, "0x"$1 } END {if (found == 1) print line, end; }')
}
[[ $# -lt 2 ]] && usage
objfile=$1
LIST=0
[[ "$objfile" == "--list" ]] && LIST=1 && shift && objfile=$1
[[ ! -f $objfile ]] && die "can't find objfile $objfile"
shift
@@ -174,4 +219,4 @@ while [[ $# -gt 0 ]]; do
__faddr2line $objfile $func_addr $DIR_PREFIX 1
warn "no match for $func_addr"
fi
done
done