1 #!/bin/bash 1 #!/bin/bash
2 # SPDX-License-Identifier: GPL-2.0 2 # SPDX-License-Identifier: GPL-2.0
3 # 3 #
4 # Translate stack dump function offsets. 4 # Translate stack dump function offsets.
5 # 5 #
6 # addr2line doesn't work with KASLR addresses. 6 # addr2line doesn't work with KASLR addresses. This works similarly to
7 # addr2line, but instead takes the 'func+0x123 7 # addr2line, but instead takes the 'func+0x123' format as input:
8 # 8 #
9 # $ ./scripts/faddr2line ~/k/vmlinux meminfo 9 # $ ./scripts/faddr2line ~/k/vmlinux meminfo_proc_show+0x5/0x568
10 # meminfo_proc_show+0x5/0x568: 10 # meminfo_proc_show+0x5/0x568:
11 # meminfo_proc_show at fs/proc/meminfo.c:27 11 # meminfo_proc_show at fs/proc/meminfo.c:27
12 # 12 #
13 # If the address is part of an inlined functio 13 # If the address is part of an inlined function, the full inline call chain is
14 # printed: 14 # printed:
15 # 15 #
16 # $ ./scripts/faddr2line ~/k/vmlinux native_ 16 # $ ./scripts/faddr2line ~/k/vmlinux native_write_msr+0x6/0x27
17 # native_write_msr+0x6/0x27: 17 # native_write_msr+0x6/0x27:
18 # arch_static_branch at arch/x86/include/asm 18 # arch_static_branch at arch/x86/include/asm/msr.h:121
19 # (inlined by) static_key_false at include/ 19 # (inlined by) static_key_false at include/linux/jump_label.h:125
20 # (inlined by) native_write_msr at arch/x86 20 # (inlined by) native_write_msr at arch/x86/include/asm/msr.h:125
21 # 21 #
22 # The function size after the '/' in the input 22 # The function size after the '/' in the input is optional, but recommended.
23 # It's used to help disambiguate any duplicate 23 # It's used to help disambiguate any duplicate symbol names, which can occur
24 # rarely. If the size is omitted for a duplic 24 # rarely. If the size is omitted for a duplicate symbol then it's possible for
25 # multiple code sites to be printed: 25 # multiple code sites to be printed:
26 # 26 #
27 # $ ./scripts/faddr2line ~/k/vmlinux raw_ioc 27 # $ ./scripts/faddr2line ~/k/vmlinux raw_ioctl+0x5
28 # raw_ioctl+0x5/0x20: 28 # raw_ioctl+0x5/0x20:
29 # raw_ioctl at drivers/char/raw.c:122 29 # raw_ioctl at drivers/char/raw.c:122
30 # 30 #
31 # raw_ioctl+0x5/0xb1: 31 # raw_ioctl+0x5/0xb1:
32 # raw_ioctl at net/ipv4/raw.c:876 32 # raw_ioctl at net/ipv4/raw.c:876
33 # 33 #
34 # Multiple addresses can be specified on a sin 34 # Multiple addresses can be specified on a single command line:
35 # 35 #
36 # $ ./scripts/faddr2line ~/k/vmlinux type_sh 36 # $ ./scripts/faddr2line ~/k/vmlinux type_show+0x10/45 free_reserved_area+0x90
37 # type_show+0x10/0x2d: 37 # type_show+0x10/0x2d:
38 # type_show at drivers/video/backlight/backl 38 # type_show at drivers/video/backlight/backlight.c:213
39 # 39 #
40 # free_reserved_area+0x90/0x123: 40 # free_reserved_area+0x90/0x123:
41 # free_reserved_area at mm/page_alloc.c:6429 41 # free_reserved_area at mm/page_alloc.c:6429 (discriminator 2)
42 42
43 43
44 set -o errexit 44 set -o errexit
45 set -o nounset 45 set -o nounset
46 46
>> 47 READELF="${CROSS_COMPILE:-}readelf"
>> 48 ADDR2LINE="${CROSS_COMPILE:-}addr2line"
>> 49 SIZE="${CROSS_COMPILE:-}size"
>> 50 NM="${CROSS_COMPILE:-}nm"
>> 51
>> 52 command -v awk >/dev/null 2>&1 || die "awk isn't installed"
>> 53 command -v ${READELF} >/dev/null 2>&1 || die "readelf isn't installed"
>> 54 command -v ${ADDR2LINE} >/dev/null 2>&1 || die "addr2line isn't installed"
>> 55 command -v ${SIZE} >/dev/null 2>&1 || die "size isn't installed"
>> 56 command -v ${NM} >/dev/null 2>&1 || die "nm isn't installed"
>> 57
47 usage() { 58 usage() {
48 echo "usage: faddr2line [--list] <obje !! 59 echo "usage: faddr2line <object file> <func+offset> <func+offset>..." >&2
49 exit 1 60 exit 1
50 } 61 }
51 62
52 warn() { 63 warn() {
53 echo "$1" >&2 64 echo "$1" >&2
54 } 65 }
55 66
56 die() { 67 die() {
57 echo "ERROR: $1" >&2 68 echo "ERROR: $1" >&2
58 exit 1 69 exit 1
59 } 70 }
60 71
61 UTIL_SUFFIX="" <<
62 if [[ "${LLVM:-}" == "" ]]; then <<
63 UTIL_PREFIX=${CROSS_COMPILE:-} <<
64 else <<
65 UTIL_PREFIX=llvm- <<
66 <<
67 if [[ "${LLVM}" == *"/" ]]; then <<
68 UTIL_PREFIX=${LLVM}${UTIL_PREF <<
69 elif [[ "${LLVM}" == "-"* ]]; then <<
70 UTIL_SUFFIX=${LLVM} <<
71 fi <<
72 fi <<
73 <<
74 READELF="${UTIL_PREFIX}readelf${UTIL_SUFFIX}" <<
75 ADDR2LINE="${UTIL_PREFIX}addr2line${UTIL_SUFFI <<
76 AWK="awk" <<
77 GREP="grep" <<
78 <<
79 command -v ${AWK} >/dev/null 2>&1 || die "${AW <<
80 command -v ${READELF} >/dev/null 2>&1 || die " <<
81 command -v ${ADDR2LINE} >/dev/null 2>&1 || die <<
82 <<
83 # Try to figure out the source directory prefi 72 # Try to figure out the source directory prefix so we can remove it from the
84 # addr2line output. HACK ALERT: This assumes 73 # addr2line output. HACK ALERT: This assumes that start_kernel() is in
85 # init/main.c! This only works for vmlinux. !! 74 # kernel/init.c! This only works for vmlinux. Otherwise it falls back to
86 # printing the absolute path. 75 # printing the absolute path.
87 find_dir_prefix() { 76 find_dir_prefix() {
88 local start_kernel_addr=$(echo "${ELF_ !! 77 local objfile=$1
89 ${AWK} '$8 == "start_kernel" { !! 78
>> 79 local start_kernel_addr=$(${READELF} -sW $objfile | awk '$8 == "start_kernel" {printf "0x%s", $2}')
90 [[ -z $start_kernel_addr ]] && return 80 [[ -z $start_kernel_addr ]] && return
91 81
92 run_addr2line ${start_kernel_addr} "" !! 82 local file_line=$(${ADDR2LINE} -e $objfile $start_kernel_addr)
93 [[ -z $ADDR2LINE_OUT ]] && return !! 83 [[ -z $file_line ]] && return
94 84
95 local file_line=${ADDR2LINE_OUT#* at } <<
96 if [[ -z $file_line ]] || [[ $file_lin <<
97 return <<
98 fi <<
99 local prefix=${file_line%init/main.c:* 85 local prefix=${file_line%init/main.c:*}
100 if [[ -z $prefix ]] || [[ $prefix = $f 86 if [[ -z $prefix ]] || [[ $prefix = $file_line ]]; then
101 return 87 return
102 fi 88 fi
103 89
104 DIR_PREFIX=$prefix 90 DIR_PREFIX=$prefix
105 return 0 91 return 0
106 } 92 }
107 93
108 run_readelf() { <<
109 local objfile=$1 <<
110 local out=$(${READELF} --file-header - <<
111 <<
112 # This assumes that readelf first prin <<
113 # Note: It seems that GNU readelf does <<
114 # line when multiple options are given <<
115 ELF_FILEHEADER=$(echo "${out}" | sed - <<
116 ELF_SECHEADERS=$(echo "${out}" | sed - <<
117 ELF_SYMS=$(echo "${out}" | sed -n '/Sy <<
118 } <<
119 <<
120 check_vmlinux() { <<
121 # vmlinux uses absolute addresses in t <<
122 # section offsets. <<
123 IS_VMLINUX=0 <<
124 local file_type=$(echo "${ELF_FILEHEAD <<
125 ${AWK} '$1 == "Type:" { print <<
126 if [[ $file_type = "EXEC" ]] || [[ $fi <<
127 IS_VMLINUX=1 <<
128 fi <<
129 } <<
130 <<
131 init_addr2line() { <<
132 local objfile=$1 <<
133 <<
134 check_vmlinux <<
135 <<
136 ADDR2LINE_ARGS="--functions --pretty-p <<
137 if [[ $IS_VMLINUX = 1 ]]; then <<
138 # If the executable file is vm <<
139 # addr2line, so we can launch <<
140 coproc ADDR2LINE_PROC (${ADDR2 <<
141 fi <<
142 } <<
143 <<
144 run_addr2line() { <<
145 local addr=$1 <<
146 local sec_name=$2 <<
147 <<
148 if [[ $IS_VMLINUX = 1 ]]; then <<
149 # We send to the addr2line pro <<
150 # value, i.e., something that <<
151 # (i.e., ","). This causes add <<
152 # our address, then (2) either <<
153 # using binutils' addr2line), <<
154 echo ${addr} >& "${ADDR2LINE_P <<
155 echo "," >& "${ADDR2LINE_PROC[ <<
156 local first_line <<
157 read -r first_line <& "${ADDR2 <<
158 ADDR2LINE_OUT=$(echo "${first_ <<
159 while read -r line <& "${ADDR2 <<
160 if [[ "$line" == "?? ? <<
161 break <<
162 fi <<
163 ADDR2LINE_OUT+=$'\n'$( <<
164 done <<
165 else <<
166 # Run addr2line as a single in <<
167 local sec_arg <<
168 [[ -z $sec_name ]] && sec_arg= <<
169 ADDR2LINE_OUT=$(${ADDR2LINE} $ <<
170 fi <<
171 } <<
172 <<
173 __faddr2line() { 94 __faddr2line() {
174 local objfile=$1 95 local objfile=$1
175 local func_addr=$2 96 local func_addr=$2
176 local dir_prefix=$3 97 local dir_prefix=$3
177 local print_warnings=$4 98 local print_warnings=$4
178 99
179 local sym_name=${func_addr%+*} !! 100 local func=${func_addr%+*}
180 local func_offset=${func_addr#*+} !! 101 local offset=${func_addr#*+}
181 func_offset=${func_offset%/*} !! 102 offset=${offset%/*}
182 local user_size= !! 103 local size=
183 [[ $func_addr =~ "/" ]] && user_size=$ !! 104 [[ $func_addr =~ "/" ]] && size=${func_addr#*/}
184 105
185 if [[ -z $sym_name ]] || [[ -z $func_o !! 106 if [[ -z $func ]] || [[ -z $offset ]] || [[ $func = $func_addr ]]; then
186 warn "bad func+offset $func_ad 107 warn "bad func+offset $func_addr"
187 DONE=1 108 DONE=1
188 return 109 return
189 fi 110 fi
190 111
191 # Go through each of the object's symb 112 # Go through each of the object's symbols which match the func name.
192 # In rare cases there might be duplica !! 113 # In rare cases there might be duplicates.
193 # matches. !! 114 file_end=$(${SIZE} -Ax $objfile | awk '$1 == ".text" {print $2}')
194 while read line; do !! 115 while read symbol; do
195 local fields=($line) !! 116 local fields=($symbol)
196 local sym_addr=0x${fields[1]} !! 117 local sym_base=0x${fields[0]}
197 local sym_elf_size=${fields[2] !! 118 local sym_type=${fields[1]}
198 local sym_sec=${fields[6]} !! 119 local sym_end=${fields[3]}
199 local sec_size <<
200 local sec_name <<
201 <<
202 # Get the section size: <<
203 sec_size=$(echo "${ELF_SECHEAD <<
204 ${AWK} -v sec=$sym_sec <<
205 <<
206 if [[ -z $sec_size ]]; then <<
207 warn "bad section size <<
208 DONE=1 <<
209 return <<
210 fi <<
211 <<
212 # Get the section name: <<
213 sec_name=$(echo "${ELF_SECHEAD <<
214 ${AWK} -v sec=$sym_sec <<
215 <<
216 if [[ -z $sec_name ]]; then <<
217 warn "bad section name <<
218 DONE=1 <<
219 return <<
220 fi <<
221 <<
222 # Calculate the symbol size. <<
223 # <<
224 # Unfortunately we can't use t <<
225 # also includes the padding by <<
226 # kallsyms, the size calculati <<
227 # symbol and the next symbol i <<
228 local sym_size <<
229 local cur_sym_addr <<
230 local found=0 <<
231 while read line; do <<
232 local fields=($line) <<
233 cur_sym_addr=0x${field <<
234 local cur_sym_elf_size <<
235 local cur_sym_name=${f <<
236 <<
237 # is_mapping_symbol(cu <<
238 if [[ ${cur_sym_name} <<
239 continue <<
240 fi <<
241 <<
242 if [[ $cur_sym_addr = <<
243 [[ $cur_sym_elf_siz <<
244 [[ $cur_sym_name = <<
245 found=1 <<
246 continue <<
247 fi <<
248 <<
249 if [[ $found = 1 ]]; t <<
250 sym_size=$(($c <<
251 [[ $sym_size - <<
252 found=2 <<
253 break <<
254 fi <<
255 done < <(echo "${ELF_SYMS}" | <<
256 <<
257 if [[ $found = 0 ]]; then <<
258 warn "can't find symbo <<
259 DONE=1 <<
260 return <<
261 fi <<
262 <<
263 # If nothing was found after t <<
264 # symbol in the section. <<
265 [[ $found = 1 ]] && sym_size=$ <<
266 120
>> 121 # calculate the size
>> 122 local sym_size=$(($sym_end - $sym_base))
267 if [[ -z $sym_size ]] || [[ $s 123 if [[ -z $sym_size ]] || [[ $sym_size -le 0 ]]; then
268 warn "bad symbol size: !! 124 warn "bad symbol size: base: $sym_base end: $sym_end"
269 DONE=1 125 DONE=1
270 return 126 return
271 fi 127 fi
272 <<
273 sym_size=0x$(printf %x $sym_si 128 sym_size=0x$(printf %x $sym_size)
274 129
275 # Calculate the address from u !! 130 # calculate the address
276 local addr=$(($sym_addr + $fun !! 131 local addr=$(($sym_base + $offset))
277 if [[ -z $addr ]] || [[ $addr 132 if [[ -z $addr ]] || [[ $addr = 0 ]]; then
278 warn "bad address: $sy !! 133 warn "bad address: $sym_base + $offset"
279 DONE=1 134 DONE=1
280 return 135 return
281 fi 136 fi
282 addr=0x$(printf %x $addr) 137 addr=0x$(printf %x $addr)
283 138
284 # If the user provided a size, !! 139 # weed out non-function symbols
285 if [[ -n $user_size ]] && [[ $ !! 140 if [[ $sym_type != t ]] && [[ $sym_type != T ]]; then
286 [[ $print_warnings = 1 141 [[ $print_warnings = 1 ]] &&
287 echo "skipping !! 142 echo "skipping $func address at $addr due to non-function symbol of type '$sym_type'"
>> 143 continue
>> 144 fi
>> 145
>> 146 # if the user provided a size, make sure it matches the symbol's size
>> 147 if [[ -n $size ]] && [[ $size -ne $sym_size ]]; then
>> 148 [[ $print_warnings = 1 ]] &&
>> 149 echo "skipping $func address at $addr due to size mismatch ($size != $sym_size)"
288 continue; 150 continue;
289 fi 151 fi
290 152
291 # Make sure the provided offse !! 153 # make sure the provided offset is within the symbol's range
292 if [[ $func_offset -gt $sym_si !! 154 if [[ $offset -gt $sym_size ]]; then
293 [[ $print_warnings = 1 155 [[ $print_warnings = 1 ]] &&
294 echo "skipping !! 156 echo "skipping $func address at $addr due to size mismatch ($offset > $sym_size)"
295 continue 157 continue
296 fi 158 fi
297 159
298 # In case of duplicates or mul !! 160 # separate multiple entries with a blank line
299 # cmdline, separate multiple e <<
300 [[ $FIRST = 0 ]] && echo 161 [[ $FIRST = 0 ]] && echo
301 FIRST=0 162 FIRST=0
302 163
303 echo "$sym_name+$func_offset/$ !! 164 # pass real address to addr2line
304 !! 165 echo "$func+$offset/$sym_size:"
305 # Pass section address to addr !! 166 ${ADDR2LINE} -fpie $objfile $addr | sed "s; $dir_prefix\(\./\)*; ;"
306 # from the output: <<
307 run_addr2line $addr $sec_name <<
308 local output=$(echo "${ADDR2LI <<
309 [[ -z $output ]] && continue <<
310 <<
311 # Default output (non --list): <<
312 if [[ $LIST = 0 ]]; then <<
313 echo "$output" | while <<
314 do <<
315 echo $line <<
316 done <<
317 DONE=1; <<
318 continue <<
319 fi <<
320 <<
321 # For --list, show each line w <<
322 echo "$output" | while read -r <<
323 do <<
324 echo <<
325 echo $line <<
326 n=$(echo $line | sed ' <<
327 n1=$[$n-5] <<
328 n2=$[$n+5] <<
329 f=$(echo $line | sed ' <<
330 ${AWK} 'NR>=strtonum(" <<
331 done <<
332 <<
333 DONE=1 167 DONE=1
334 168
335 done < <(echo "${ELF_SYMS}" | sed 's/\ !! 169 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; }')
336 } 170 }
337 171
338 [[ $# -lt 2 ]] && usage 172 [[ $# -lt 2 ]] && usage
339 173
340 objfile=$1 174 objfile=$1
341 <<
342 LIST=0 <<
343 [[ "$objfile" == "--list" ]] && LIST=1 && shif <<
344 <<
345 [[ ! -f $objfile ]] && die "can't find objfile 175 [[ ! -f $objfile ]] && die "can't find objfile $objfile"
346 shift 176 shift
347 177
348 run_readelf $objfile <<
349 <<
350 echo "${ELF_SECHEADERS}" | ${GREP} -q '\.debug <<
351 <<
352 init_addr2line $objfile <<
353 <<
354 DIR_PREFIX=supercalifragilisticexpialidocious 178 DIR_PREFIX=supercalifragilisticexpialidocious
355 find_dir_prefix !! 179 find_dir_prefix $objfile
356 180
357 FIRST=1 181 FIRST=1
358 while [[ $# -gt 0 ]]; do 182 while [[ $# -gt 0 ]]; do
359 func_addr=$1 183 func_addr=$1
360 shift 184 shift
361 185
362 # print any matches found 186 # print any matches found
363 DONE=0 187 DONE=0
364 __faddr2line $objfile $func_addr $DIR_ 188 __faddr2line $objfile $func_addr $DIR_PREFIX 0
365 189
366 # if no match was found, print warning 190 # if no match was found, print warnings
367 if [[ $DONE = 0 ]]; then 191 if [[ $DONE = 0 ]]; then
368 __faddr2line $objfile $func_ad 192 __faddr2line $objfile $func_addr $DIR_PREFIX 1
369 warn "no match for $func_addr" 193 warn "no match for $func_addr"
370 fi 194 fi
371 done 195 done
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.