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295 lines
8.3 KiB
295 lines
8.3 KiB
#!/bin/bash |
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# SPDX-License-Identifier: GPL-2.0 |
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# |
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# Translate stack dump function offsets. |
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# |
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# addr2line doesn't work with KASLR addresses. This works similarly to |
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# addr2line, but instead takes the 'func+0x123' format as input: |
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# |
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# $ ./scripts/faddr2line ~/k/vmlinux meminfo_proc_show+0x5/0x568 |
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# meminfo_proc_show+0x5/0x568: |
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# meminfo_proc_show at fs/proc/meminfo.c:27 |
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# |
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# If the address is part of an inlined function, the full inline call chain is |
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# printed: |
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# |
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# $ ./scripts/faddr2line ~/k/vmlinux native_write_msr+0x6/0x27 |
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# native_write_msr+0x6/0x27: |
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# arch_static_branch at arch/x86/include/asm/msr.h:121 |
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# (inlined by) static_key_false at include/linux/jump_label.h:125 |
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# (inlined by) native_write_msr at arch/x86/include/asm/msr.h:125 |
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# |
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# The function size after the '/' in the input is optional, but recommended. |
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# It's used to help disambiguate any duplicate symbol names, which can occur |
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# rarely. If the size is omitted for a duplicate symbol then it's possible for |
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# multiple code sites to be printed: |
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# |
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# $ ./scripts/faddr2line ~/k/vmlinux raw_ioctl+0x5 |
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# raw_ioctl+0x5/0x20: |
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# raw_ioctl at drivers/char/raw.c:122 |
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# |
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# raw_ioctl+0x5/0xb1: |
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# raw_ioctl at net/ipv4/raw.c:876 |
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# |
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# Multiple addresses can be specified on a single command line: |
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# |
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# $ ./scripts/faddr2line ~/k/vmlinux type_show+0x10/45 free_reserved_area+0x90 |
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# type_show+0x10/0x2d: |
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# type_show at drivers/video/backlight/backlight.c:213 |
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# |
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# free_reserved_area+0x90/0x123: |
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# free_reserved_area at mm/page_alloc.c:6429 (discriminator 2) |
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set -o errexit |
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set -o nounset |
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usage() { |
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echo "usage: faddr2line [--list] <object file> <func+offset> <func+offset>..." >&2 |
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exit 1 |
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} |
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warn() { |
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echo "$1" >&2 |
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} |
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die() { |
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echo "ERROR: $1" >&2 |
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exit 1 |
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} |
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READELF="${CROSS_COMPILE:-}readelf" |
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ADDR2LINE="${CROSS_COMPILE:-}addr2line" |
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AWK="awk" |
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GREP="grep" |
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command -v ${AWK} >/dev/null 2>&1 || die "${AWK} isn't installed" |
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command -v ${READELF} >/dev/null 2>&1 || die "${READELF} isn't installed" |
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command -v ${ADDR2LINE} >/dev/null 2>&1 || die "${ADDR2LINE} isn't installed" |
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# Try to figure out the source directory prefix so we can remove it from the |
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# addr2line output. HACK ALERT: This assumes that start_kernel() is in |
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# init/main.c! This only works for vmlinux. Otherwise it falls back to |
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# printing the absolute path. |
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find_dir_prefix() { |
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local objfile=$1 |
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local start_kernel_addr=$(${READELF} --symbols --wide $objfile | sed 's/\[.*\]//' | |
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${AWK} '$8 == "start_kernel" {printf "0x%s", $2}') |
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[[ -z $start_kernel_addr ]] && return |
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local file_line=$(${ADDR2LINE} -e $objfile $start_kernel_addr) |
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[[ -z $file_line ]] && return |
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local prefix=${file_line%init/main.c:*} |
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if [[ -z $prefix ]] || [[ $prefix = $file_line ]]; then |
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return |
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fi |
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DIR_PREFIX=$prefix |
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return 0 |
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} |
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__faddr2line() { |
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local objfile=$1 |
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local func_addr=$2 |
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local dir_prefix=$3 |
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local print_warnings=$4 |
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local sym_name=${func_addr%+*} |
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local func_offset=${func_addr#*+} |
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func_offset=${func_offset%/*} |
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local user_size= |
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local file_type |
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local is_vmlinux=0 |
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[[ $func_addr =~ "/" ]] && user_size=${func_addr#*/} |
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if [[ -z $sym_name ]] || [[ -z $func_offset ]] || [[ $sym_name = $func_addr ]]; then |
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warn "bad func+offset $func_addr" |
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DONE=1 |
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return |
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fi |
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# vmlinux uses absolute addresses in the section table rather than |
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# section offsets. |
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local file_type=$(${READELF} --file-header $objfile | |
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${AWK} '$1 == "Type:" { print $2; exit }') |
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if [[ $file_type = "EXEC" ]] || [[ $file_type == "DYN" ]]; then |
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is_vmlinux=1 |
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fi |
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# Go through each of the object's symbols which match the func name. |
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# In rare cases there might be duplicates, in which case we print all |
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# matches. |
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while read line; do |
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local fields=($line) |
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local sym_addr=0x${fields[1]} |
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local sym_elf_size=${fields[2]} |
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local sym_sec=${fields[6]} |
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local sec_size |
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local sec_name |
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# Get the section size: |
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sec_size=$(${READELF} --section-headers --wide $objfile | |
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sed 's/\[ /\[/' | |
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${AWK} -v sec=$sym_sec '$1 == "[" sec "]" { print "0x" $6; exit }') |
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if [[ -z $sec_size ]]; then |
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warn "bad section size: section: $sym_sec" |
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DONE=1 |
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return |
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fi |
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# Get the section name: |
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sec_name=$(${READELF} --section-headers --wide $objfile | |
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sed 's/\[ /\[/' | |
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${AWK} -v sec=$sym_sec '$1 == "[" sec "]" { print $2; exit }') |
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if [[ -z $sec_name ]]; then |
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warn "bad section name: section: $sym_sec" |
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DONE=1 |
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return |
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fi |
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# Calculate the symbol size. |
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# |
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# Unfortunately we can't use the ELF size, because kallsyms |
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# also includes the padding bytes in its size calculation. For |
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# kallsyms, the size calculation is the distance between the |
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# symbol and the next symbol in a sorted list. |
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local sym_size |
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local cur_sym_addr |
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local found=0 |
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while read line; do |
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local fields=($line) |
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cur_sym_addr=0x${fields[1]} |
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local cur_sym_elf_size=${fields[2]} |
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local cur_sym_name=${fields[7]:-} |
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if [[ $cur_sym_addr = $sym_addr ]] && |
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[[ $cur_sym_elf_size = $sym_elf_size ]] && |
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[[ $cur_sym_name = $sym_name ]]; then |
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found=1 |
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continue |
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fi |
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if [[ $found = 1 ]]; then |
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sym_size=$(($cur_sym_addr - $sym_addr)) |
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[[ $sym_size -lt $sym_elf_size ]] && continue; |
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found=2 |
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break |
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fi |
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done < <(${READELF} --symbols --wide $objfile | sed 's/\[.*\]//' | ${AWK} -v sec=$sym_sec '$7 == sec' | sort --key=2) |
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if [[ $found = 0 ]]; then |
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warn "can't find symbol: sym_name: $sym_name sym_sec: $sym_sec sym_addr: $sym_addr sym_elf_size: $sym_elf_size" |
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DONE=1 |
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return |
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fi |
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# If nothing was found after the symbol, assume it's the last |
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# symbol in the section. |
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[[ $found = 1 ]] && sym_size=$(($sec_size - $sym_addr)) |
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if [[ -z $sym_size ]] || [[ $sym_size -le 0 ]]; then |
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warn "bad symbol size: sym_addr: $sym_addr cur_sym_addr: $cur_sym_addr" |
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DONE=1 |
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return |
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fi |
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sym_size=0x$(printf %x $sym_size) |
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# Calculate the address from user-supplied offset: |
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local addr=$(($sym_addr + $func_offset)) |
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if [[ -z $addr ]] || [[ $addr = 0 ]]; then |
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warn "bad address: $sym_addr + $func_offset" |
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DONE=1 |
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return |
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fi |
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addr=0x$(printf %x $addr) |
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# If the user provided a size, make sure it matches the symbol's size: |
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if [[ -n $user_size ]] && [[ $user_size -ne $sym_size ]]; then |
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[[ $print_warnings = 1 ]] && |
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echo "skipping $sym_name address at $addr due to size mismatch ($user_size != $sym_size)" |
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continue; |
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fi |
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# Make sure the provided offset is within the symbol's range: |
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if [[ $func_offset -gt $sym_size ]]; then |
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[[ $print_warnings = 1 ]] && |
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echo "skipping $sym_name address at $addr due to size mismatch ($func_offset > $sym_size)" |
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continue |
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fi |
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# In case of duplicates or multiple addresses specified on the |
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# cmdline, separate multiple entries with a blank line: |
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[[ $FIRST = 0 ]] && echo |
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FIRST=0 |
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echo "$sym_name+$func_offset/$sym_size:" |
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# Pass section address to addr2line and strip absolute paths |
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# from the output: |
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local args="--functions --pretty-print --inlines --exe=$objfile" |
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[[ $is_vmlinux = 0 ]] && args="$args --section=$sec_name" |
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local output=$(${ADDR2LINE} $args $addr | sed "s; $dir_prefix\(\./\)*; ;") |
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[[ -z $output ]] && continue |
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# Default output (non --list): |
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if [[ $LIST = 0 ]]; then |
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echo "$output" | while read -r line |
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do |
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echo $line |
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done |
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DONE=1; |
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continue |
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fi |
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# For --list, show each line with its corresponding source code: |
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echo "$output" | while read -r line |
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do |
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echo |
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echo $line |
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n=$(echo $line | sed 's/.*:\([0-9]\+\).*/\1/g') |
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n1=$[$n-5] |
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n2=$[$n+5] |
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f=$(echo $line | sed 's/.*at \(.\+\):.*/\1/g') |
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${AWK} 'NR>=strtonum("'$n1'") && NR<=strtonum("'$n2'") { if (NR=='$n') printf(">%d<", NR); else printf(" %d ", NR); printf("\t%s\n", $0)}' $f |
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done |
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DONE=1 |
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done < <(${READELF} --symbols --wide $objfile | sed 's/\[.*\]//' | ${AWK} -v fn=$sym_name '$4 == "FUNC" && $8 == fn') |
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} |
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[[ $# -lt 2 ]] && usage |
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objfile=$1 |
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LIST=0 |
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[[ "$objfile" == "--list" ]] && LIST=1 && shift && objfile=$1 |
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[[ ! -f $objfile ]] && die "can't find objfile $objfile" |
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shift |
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${READELF} --section-headers --wide $objfile | ${GREP} -q '\.debug_info' || die "CONFIG_DEBUG_INFO not enabled" |
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DIR_PREFIX=supercalifragilisticexpialidocious |
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find_dir_prefix $objfile |
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FIRST=1 |
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while [[ $# -gt 0 ]]; do |
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func_addr=$1 |
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shift |
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# print any matches found |
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DONE=0 |
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__faddr2line $objfile $func_addr $DIR_PREFIX 0 |
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# if no match was found, print warnings |
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if [[ $DONE = 0 ]]; then |
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__faddr2line $objfile $func_addr $DIR_PREFIX 1 |
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warn "no match for $func_addr" |
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fi |
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done
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