Commit | Line | Data |
---|---|---|
765f2bf0 | 1 | #!/bin/bash |
b2441318 | 2 | # SPDX-License-Identifier: GPL-2.0 |
dcecc6c7 RD |
3 | # Disassemble the Code: line in Linux oopses |
4 | # usage: decodecode < oops.file | |
5 | # | |
6 | # options: set env. variable AFLAGS=options to pass options to "as"; | |
7 | # e.g., to decode an i386 oops on an x86_64 system, use: | |
8 | # AFLAGS=--32 decodecode < 386.oops | |
d72e720a | 9 | # PC=hex - the PC (program counter) the oops points to |
dcecc6c7 | 10 | |
765f2bf0 BP |
11 | faultlinenum=1 |
12 | ||
fa220d89 | 13 | cleanup() { |
5358db0b | 14 | rm -f $T $T.s $T.o $T.oo $T.aa $T.dis |
fa220d89 RD |
15 | exit 1 |
16 | } | |
17 | ||
18 | die() { | |
19 | echo "$@" | |
20 | exit 1 | |
21 | } | |
22 | ||
23 | trap cleanup EXIT | |
24 | ||
25 | T=`mktemp` || die "cannot create temp file" | |
dcecc6c7 | 26 | code= |
7e68b361 | 27 | cont= |
dcecc6c7 RD |
28 | |
29 | while read i ; do | |
30 | ||
31 | case "$i" in | |
32 | *Code:*) | |
33 | code=$i | |
7e68b361 AS |
34 | cont=yes |
35 | ;; | |
36 | *) | |
37 | [ -n "$cont" ] && { | |
38 | xdump="$(echo $i | grep '^[[:xdigit:]<>[:space:]]\+$')" | |
39 | if [ -n "$xdump" ]; then | |
40 | code="$code $xdump" | |
41 | else | |
42 | cont= | |
43 | fi | |
44 | } | |
dcecc6c7 RD |
45 | ;; |
46 | esac | |
47 | ||
48 | done | |
49 | ||
50 | if [ -z "$code" ]; then | |
fa220d89 | 51 | rm $T |
dcecc6c7 RD |
52 | exit |
53 | fi | |
54 | ||
55 | echo $code | |
56 | code=`echo $code | sed -e 's/.*Code: //'` | |
57 | ||
5358db0b | 58 | width=`expr index "$code" ' '` |
b396aa03 | 59 | width=$((($width-1)/2)) |
5358db0b RV |
60 | case $width in |
61 | 1) type=byte ;; | |
62 | 2) type=2byte ;; | |
63 | 4) type=4byte ;; | |
64 | esac | |
65 | ||
c5cfb62f MZ |
66 | if [ -z "$ARCH" ]; then |
67 | case `uname -m` in | |
68 | aarch64*) ARCH=arm64 ;; | |
69 | arm*) ARCH=arm ;; | |
d738bced | 70 | loongarch*) ARCH=loongarch ;; |
c5cfb62f MZ |
71 | esac |
72 | fi | |
73 | ||
d72e720a | 74 | # Params: (tmp_file, pc_sub) |
5358db0b | 75 | disas() { |
d72e720a BP |
76 | t=$1 |
77 | pc_sub=$2 | |
78 | ||
79 | ${CROSS_COMPILE}as $AFLAGS -o $t.o $t.s > /dev/null 2>&1 | |
5358db0b | 80 | |
b396aa03 RV |
81 | if [ "$ARCH" = "arm" ]; then |
82 | if [ $width -eq 2 ]; then | |
5358db0b RV |
83 | OBJDUMPFLAGS="-M force-thumb" |
84 | fi | |
85 | ||
d72e720a | 86 | ${CROSS_COMPILE}strip $t.o |
5358db0b RV |
87 | fi |
88 | ||
be9fa663 WD |
89 | if [ "$ARCH" = "arm64" ]; then |
90 | if [ $width -eq 4 ]; then | |
91 | type=inst | |
92 | fi | |
93 | ||
d72e720a | 94 | ${CROSS_COMPILE}strip $t.o |
be9fa663 WD |
95 | fi |
96 | ||
00b24250 BT |
97 | if [ "$ARCH" = "riscv" ]; then |
98 | OBJDUMPFLAGS="-M no-aliases --section=.text -D" | |
99 | ${CROSS_COMPILE}strip $t.o | |
100 | fi | |
101 | ||
d738bced YT |
102 | if [ "$ARCH" = "loongarch" ]; then |
103 | ${CROSS_COMPILE}strip $t.o | |
104 | fi | |
105 | ||
d72e720a BP |
106 | if [ $pc_sub -ne 0 ]; then |
107 | if [ $PC ]; then | |
108 | adj_vma=$(( $PC - $pc_sub )) | |
109 | OBJDUMPFLAGS="$OBJDUMPFLAGS --adjust-vma=$adj_vma" | |
110 | fi | |
111 | fi | |
112 | ||
113 | ${CROSS_COMPILE}objdump $OBJDUMPFLAGS -S $t.o | \ | |
114 | grep -v "/tmp\|Disassembly\|\.text\|^$" > $t.dis 2>&1 | |
5358db0b RV |
115 | } |
116 | ||
765f2bf0 BP |
117 | # Match the maximum number of opcode bytes from @op_bytes contained within |
118 | # @opline | |
119 | # | |
120 | # Params: | |
121 | # @op_bytes: The string of bytes from the Code: line | |
122 | # @opline: The disassembled line coming from objdump | |
123 | # | |
124 | # Returns: | |
125 | # The max number of opcode bytes from the beginning of @op_bytes which match | |
126 | # the opcode bytes in the objdump line. | |
127 | get_substr_opcode_bytes_num() | |
128 | { | |
129 | local op_bytes=$1 | |
130 | local opline=$2 | |
131 | ||
132 | local retval=0 | |
133 | substr="" | |
134 | ||
135 | for opc in $op_bytes; | |
136 | do | |
137 | substr+="$opc" | |
138 | ||
00b24250 BT |
139 | opcode="$substr" |
140 | if [ "$ARCH" = "riscv" ]; then | |
141 | opcode=$(echo $opcode | tr ' ' '\n' | tac | tr -d '\n') | |
142 | fi | |
143 | ||
765f2bf0 | 144 | # return if opcode bytes do not match @opline anymore |
00b24250 | 145 | if ! echo $opline | grep -q "$opcode"; |
765f2bf0 BP |
146 | then |
147 | break | |
148 | fi | |
149 | ||
150 | # add trailing space | |
151 | substr+=" " | |
152 | retval=$((retval+1)) | |
153 | done | |
154 | ||
155 | return $retval | |
156 | } | |
157 | ||
158 | # Return the line number in objdump output to where the IP marker in the Code: | |
159 | # line points to | |
160 | # | |
161 | # Params: | |
162 | # @all_code: code in bytes without the marker | |
163 | # @dis_file: disassembled file | |
164 | # @ip_byte: The byte to which the IP points to | |
165 | get_faultlinenum() | |
166 | { | |
167 | local all_code="$1" | |
168 | local dis_file="$2" | |
169 | ||
170 | # num bytes including IP byte | |
171 | local num_bytes_ip=$(( $3 + 1 * $width )) | |
172 | ||
173 | # Add the two header lines (we're counting from 1). | |
174 | local retval=3 | |
175 | ||
176 | # remove marker | |
177 | all_code=$(echo $all_code | sed -e 's/[<>()]//g') | |
178 | ||
179 | while read line | |
180 | do | |
181 | get_substr_opcode_bytes_num "$all_code" "$line" | |
182 | ate_opcodes=$? | |
183 | ||
184 | if ! (( $ate_opcodes )); then | |
185 | continue | |
186 | fi | |
187 | ||
188 | num_bytes_ip=$((num_bytes_ip - ($ate_opcodes * $width) )) | |
189 | if (( $num_bytes_ip <= 0 )); then | |
190 | break | |
191 | fi | |
192 | ||
193 | # Delete matched opcode bytes from all_code. For that, compute | |
194 | # how many chars those opcodes are represented by and include | |
195 | # trailing space. | |
196 | # | |
197 | # a byte is 2 chars, ate_opcodes is also the number of trailing | |
198 | # spaces | |
199 | del_chars=$(( ($ate_opcodes * $width * 2) + $ate_opcodes )) | |
200 | ||
201 | all_code=$(echo $all_code | sed -e "s!^.\{$del_chars\}!!") | |
202 | ||
203 | let "retval+=1" | |
204 | ||
205 | done < $dis_file | |
206 | ||
207 | return $retval | |
208 | } | |
209 | ||
dcecc6c7 RD |
210 | marker=`expr index "$code" "\<"` |
211 | if [ $marker -eq 0 ]; then | |
212 | marker=`expr index "$code" "\("` | |
213 | fi | |
214 | ||
846442c8 | 215 | touch $T.oo |
dcecc6c7 | 216 | if [ $marker -ne 0 ]; then |
765f2bf0 BP |
217 | # How many bytes to subtract from the program counter |
218 | # in order to get to the beginning virtual address of the | |
219 | # Code: | |
220 | pc_sub=$(( (($marker - 1) / (2 * $width + 1)) * $width )) | |
846442c8 AV |
221 | echo All code >> $T.oo |
222 | echo ======== >> $T.oo | |
223 | beforemark=`echo "$code"` | |
5358db0b | 224 | echo -n " .$type 0x" > $T.s |
765f2bf0 | 225 | |
5358db0b | 226 | echo $beforemark | sed -e 's/ /,0x/g; s/[<>()]//g' >> $T.s |
765f2bf0 | 227 | |
d72e720a | 228 | disas $T $pc_sub |
765f2bf0 | 229 | |
5358db0b | 230 | cat $T.dis >> $T.oo |
dcecc6c7 | 231 | |
765f2bf0 BP |
232 | get_faultlinenum "$code" "$T.dis" $pc_sub |
233 | faultlinenum=$? | |
234 | ||
235 | # and fix code at-and-after marker | |
dcecc6c7 | 236 | code=`echo "$code" | cut -c$((${marker} + 1))-` |
765f2bf0 BP |
237 | |
238 | rm -f $T.o $T.s $T.dis | |
dcecc6c7 | 239 | fi |
765f2bf0 | 240 | |
846442c8 AV |
241 | echo Code starting with the faulting instruction > $T.aa |
242 | echo =========================================== >> $T.aa | |
75e2f715 | 243 | code=`echo $code | sed -e 's/\r//;s/ [<(]/ /;s/[>)] / /;s/ /,0x/g; s/[>)]$//'` |
5358db0b | 244 | echo -n " .$type 0x" > $T.s |
dcecc6c7 | 245 | echo $code >> $T.s |
d72e720a | 246 | disas $T 0 |
5358db0b | 247 | cat $T.dis >> $T.aa |
846442c8 | 248 | |
e08df079 | 249 | cat $T.oo | sed -e "${faultlinenum}s/^\([^:]*:\)\(.*\)/\1\*\2\t\t<-- trapping instruction/" |
846442c8 AV |
250 | echo |
251 | cat $T.aa | |
252 | cleanup |