3 # Translate stack dump function offsets.
5 # addr2line doesn't work with KASLR addresses. This works similarly to
6 # addr2line, but instead takes the 'func+0x123' format as input:
8 # $ ./scripts/faddr2line ~/k/vmlinux meminfo_proc_show+0x5/0x568
9 # meminfo_proc_show+0x5/0x568:
10 # meminfo_proc_show at fs/proc/meminfo.c:27
12 # If the address is part of an inlined function, the full inline call chain is
15 # $ ./scripts/faddr2line ~/k/vmlinux native_write_msr+0x6/0x27
16 # native_write_msr+0x6/0x27:
17 # arch_static_branch at arch/x86/include/asm/msr.h:121
18 # (inlined by) static_key_false at include/linux/jump_label.h:125
19 # (inlined by) native_write_msr at arch/x86/include/asm/msr.h:125
21 # The function size after the '/' in the input is optional, but recommended.
22 # It's used to help disambiguate any duplicate symbol names, which can occur
23 # rarely. If the size is omitted for a duplicate symbol then it's possible for
24 # multiple code sites to be printed:
26 # $ ./scripts/faddr2line ~/k/vmlinux raw_ioctl+0x5
28 # raw_ioctl at drivers/char/raw.c:122
31 # raw_ioctl at net/ipv4/raw.c:876
33 # Multiple addresses can be specified on a single command line:
35 # $ ./scripts/faddr2line ~/k/vmlinux type_show+0x10/45 free_reserved_area+0x90
36 # type_show+0x10/0x2d:
37 # type_show at drivers/video/backlight/backlight.c:213
39 # free_reserved_area+0x90/0x123:
40 # free_reserved_area at mm/page_alloc.c:6429 (discriminator 2)
46 command -v awk >/dev
/null
2>&1 || die
"awk isn't installed"
47 command -v readelf
>/dev
/null
2>&1 || die
"readelf isn't installed"
48 command -v addr2line
>/dev
/null
2>&1 || die
"addr2line isn't installed"
51 echo "usage: faddr2line <object file> <func+offset> <func+offset>..." >&2
64 # Try to figure out the source directory prefix so we can remove it from the
65 # addr2line output. HACK ALERT: This assumes that start_kernel() is in
66 # kernel/init.c! This only works for vmlinux. Otherwise it falls back to
67 # printing the absolute path.
71 local start_kernel_addr
=$
(readelf
-sW $objfile |
awk '$8 == "start_kernel" {printf "0x%s", $2}')
72 [[ -z $start_kernel_addr ]] && return
74 local file_line
=$
(addr2line
-e $objfile $start_kernel_addr)
75 [[ -z $file_line ]] && return
77 local prefix
=${file_line%init/main.c:*}
78 if [[ -z $prefix ]] ||
[[ $prefix = $file_line ]]; then
90 local print_warnings
=$4
92 local func
=${func_addr%+*}
93 local offset
=${func_addr#*+}
96 [[ $func_addr =~
"/" ]] && size
=${func_addr#*/}
98 if [[ -z $func ]] ||
[[ -z $offset ]] ||
[[ $func = $func_addr ]]; then
99 warn
"bad func+offset $func_addr"
104 # Go through each of the object's symbols which match the func name.
105 # In rare cases there might be duplicates.
106 file_end
=$
(size
-Ax $objfile |
awk '$1 == ".text" {print $2}')
107 while read symbol
; do
108 local fields
=($symbol)
109 local sym_base
=0x
${fields[0]}
110 local sym_type
=${fields[1]}
111 local sym_end
=${fields[3]}
114 local sym_size
=$
(($sym_end - $sym_base))
115 if [[ -z $sym_size ]] ||
[[ $sym_size -le 0 ]]; then
116 warn
"bad symbol size: base: $sym_base end: $sym_end"
120 sym_size
=0x$
(printf %x
$sym_size)
122 # calculate the address
123 local addr
=$
(($sym_base + $offset))
124 if [[ -z $addr ]] ||
[[ $addr = 0 ]]; then
125 warn
"bad address: $sym_base + $offset"
129 addr
=0x$
(printf %x
$addr)
131 # weed out non-function symbols
132 if [[ $sym_type != t
]] && [[ $sym_type != T
]]; then
133 [[ $print_warnings = 1 ]] &&
134 echo "skipping $func address at $addr due to non-function symbol of type '$sym_type'"
138 # if the user provided a size, make sure it matches the symbol's size
139 if [[ -n $size ]] && [[ $size -ne $sym_size ]]; then
140 [[ $print_warnings = 1 ]] &&
141 echo "skipping $func address at $addr due to size mismatch ($size != $sym_size)"
145 # make sure the provided offset is within the symbol's range
146 if [[ $offset -gt $sym_size ]]; then
147 [[ $print_warnings = 1 ]] &&
148 echo "skipping $func address at $addr due to size mismatch ($offset > $sym_size)"
152 # separate multiple entries with a blank line
153 [[ $FIRST = 0 ]] && echo
156 # pass real address to addr2line
157 echo "$func+$offset/$sym_size:"
158 addr2line
-fpie $objfile $addr |
sed "s; $dir_prefix\(\./\)*; ;"
161 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; }')
164 [[ $# -lt 2 ]] && usage
167 [[ ! -f $objfile ]] && die
"can't find objfile $objfile"
170 DIR_PREFIX
=supercalifragilisticexpialidocious
171 find_dir_prefix
$objfile
174 while [[ $# -gt 0 ]]; do
178 # print any matches found
180 __faddr2line
$objfile $func_addr $DIR_PREFIX 0
182 # if no match was found, print warnings
183 if [[ $DONE = 0 ]]; then
184 __faddr2line
$objfile $func_addr $DIR_PREFIX 1
185 warn
"no match for $func_addr"