177 lines
4.8 KiB
Bash
Executable file
177 lines
4.8 KiB
Bash
Executable file
#!/bin/bash
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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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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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usage() {
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echo "usage: faddr2line <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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# 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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# kernel/init.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 -sW $objfile | 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=$4
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local func=${func_addr%+*}
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local offset=${func_addr#*+}
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offset=${offset%/*}
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local size=
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[[ $func_addr =~ "/" ]] && size=${func_addr#*/}
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if [[ -z $func ]] || [[ -z $offset ]] || [[ $func = $func_addr ]]; then
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warn "bad func+offset $func_addr"
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DONE=1
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return
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fi
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# Go through each of the object's symbols which match the func name.
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# In rare cases there might be duplicates.
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while read symbol; do
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local fields=($symbol)
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local sym_base=0x${fields[1]}
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local sym_size=${fields[2]}
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local sym_type=${fields[3]}
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# calculate the address
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local addr=$(($sym_base + $offset))
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if [[ -z $addr ]] || [[ $addr = 0 ]]; then
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warn "bad address: $sym_base + $offset"
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DONE=1
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return
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fi
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local hexaddr=0x$(printf %x $addr)
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# weed out non-function symbols
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if [[ $sym_type != "FUNC" ]]; then
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[[ $print_warnings = 1 ]] &&
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echo "skipping $func address at $hexaddr due to non-function symbol"
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continue
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fi
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# if the user provided a size, make sure it matches the symbol's size
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if [[ -n $size ]] && [[ $size -ne $sym_size ]]; then
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[[ $print_warnings = 1 ]] &&
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echo "skipping $func address at $hexaddr due to size mismatch ($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 [[ $offset -gt $sym_size ]]; then
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[[ $print_warnings = 1 ]] &&
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echo "skipping $func address at $hexaddr due to size mismatch ($offset > $sym_size)"
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continue
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fi
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# separate multiple entries with a blank line
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[[ $FIRST = 0 ]] && echo
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FIRST=0
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local hexsize=0x$(printf %x $sym_size)
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echo "$func+$offset/$hexsize:"
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addr2line -fpie $objfile $hexaddr | sed "s; $dir_prefix\(\./\)*; ;"
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DONE=1
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done < <(readelf -sW $objfile | awk -v f=$func '$8 == f {print}')
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}
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[[ $# -lt 2 ]] && usage
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objfile=$1
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[[ ! -f $objfile ]] && die "can't find objfile $objfile"
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shift
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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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