ublk_drv: add device parameter UBLK_PARAM_TYPE_DEVT
[linux-block.git] / scripts / decodecode
CommitLineData
765f2bf0 1#!/bin/bash
b2441318 2# SPDX-License-Identifier: GPL-2.0
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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
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11faultlinenum=1
12
fa220d89 13cleanup() {
5358db0b 14 rm -f $T $T.s $T.o $T.oo $T.aa $T.dis
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15 exit 1
16}
17
18die() {
19 echo "$@"
20 exit 1
21}
22
23trap cleanup EXIT
24
25T=`mktemp` || die "cannot create temp file"
dcecc6c7 26code=
7e68b361 27cont=
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28
29while read i ; do
30
31case "$i" in
32*Code:*)
33 code=$i
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34 cont=yes
35 ;;
36*)
37 [ -n "$cont" ] && {
38 xdump="$(echo $i | grep '^[[:xdigit:]<>[:space:]]\+$')"
39 if [ -n "$xdump" ]; then
40 code="$code $xdump"
41 else
42 cont=
43 fi
44 }
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45 ;;
46esac
47
48done
49
50if [ -z "$code" ]; then
fa220d89 51 rm $T
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52 exit
53fi
54
55echo $code
56code=`echo $code | sed -e 's/.*Code: //'`
57
5358db0b 58width=`expr index "$code" ' '`
b396aa03 59width=$((($width-1)/2))
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60case $width in
611) type=byte ;;
622) type=2byte ;;
634) type=4byte ;;
64esac
65
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66if [ -z "$ARCH" ]; then
67 case `uname -m` in
68 aarch64*) ARCH=arm64 ;;
69 arm*) ARCH=arm ;;
70 esac
71fi
72
d72e720a 73# Params: (tmp_file, pc_sub)
5358db0b 74disas() {
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75 t=$1
76 pc_sub=$2
77
78 ${CROSS_COMPILE}as $AFLAGS -o $t.o $t.s > /dev/null 2>&1
5358db0b 79
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80 if [ "$ARCH" = "arm" ]; then
81 if [ $width -eq 2 ]; then
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82 OBJDUMPFLAGS="-M force-thumb"
83 fi
84
d72e720a 85 ${CROSS_COMPILE}strip $t.o
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86 fi
87
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88 if [ "$ARCH" = "arm64" ]; then
89 if [ $width -eq 4 ]; then
90 type=inst
91 fi
92
d72e720a 93 ${CROSS_COMPILE}strip $t.o
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94 fi
95
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96 if [ $pc_sub -ne 0 ]; then
97 if [ $PC ]; then
98 adj_vma=$(( $PC - $pc_sub ))
99 OBJDUMPFLAGS="$OBJDUMPFLAGS --adjust-vma=$adj_vma"
100 fi
101 fi
102
103 ${CROSS_COMPILE}objdump $OBJDUMPFLAGS -S $t.o | \
104 grep -v "/tmp\|Disassembly\|\.text\|^$" > $t.dis 2>&1
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105}
106
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107# Match the maximum number of opcode bytes from @op_bytes contained within
108# @opline
109#
110# Params:
111# @op_bytes: The string of bytes from the Code: line
112# @opline: The disassembled line coming from objdump
113#
114# Returns:
115# The max number of opcode bytes from the beginning of @op_bytes which match
116# the opcode bytes in the objdump line.
117get_substr_opcode_bytes_num()
118{
119 local op_bytes=$1
120 local opline=$2
121
122 local retval=0
123 substr=""
124
125 for opc in $op_bytes;
126 do
127 substr+="$opc"
128
129 # return if opcode bytes do not match @opline anymore
130 if ! echo $opline | grep -q "$substr";
131 then
132 break
133 fi
134
135 # add trailing space
136 substr+=" "
137 retval=$((retval+1))
138 done
139
140 return $retval
141}
142
143# Return the line number in objdump output to where the IP marker in the Code:
144# line points to
145#
146# Params:
147# @all_code: code in bytes without the marker
148# @dis_file: disassembled file
149# @ip_byte: The byte to which the IP points to
150get_faultlinenum()
151{
152 local all_code="$1"
153 local dis_file="$2"
154
155 # num bytes including IP byte
156 local num_bytes_ip=$(( $3 + 1 * $width ))
157
158 # Add the two header lines (we're counting from 1).
159 local retval=3
160
161 # remove marker
162 all_code=$(echo $all_code | sed -e 's/[<>()]//g')
163
164 while read line
165 do
166 get_substr_opcode_bytes_num "$all_code" "$line"
167 ate_opcodes=$?
168
169 if ! (( $ate_opcodes )); then
170 continue
171 fi
172
173 num_bytes_ip=$((num_bytes_ip - ($ate_opcodes * $width) ))
174 if (( $num_bytes_ip <= 0 )); then
175 break
176 fi
177
178 # Delete matched opcode bytes from all_code. For that, compute
179 # how many chars those opcodes are represented by and include
180 # trailing space.
181 #
182 # a byte is 2 chars, ate_opcodes is also the number of trailing
183 # spaces
184 del_chars=$(( ($ate_opcodes * $width * 2) + $ate_opcodes ))
185
186 all_code=$(echo $all_code | sed -e "s!^.\{$del_chars\}!!")
187
188 let "retval+=1"
189
190 done < $dis_file
191
192 return $retval
193}
194
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195marker=`expr index "$code" "\<"`
196if [ $marker -eq 0 ]; then
197 marker=`expr index "$code" "\("`
198fi
199
846442c8 200touch $T.oo
dcecc6c7 201if [ $marker -ne 0 ]; then
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202 # How many bytes to subtract from the program counter
203 # in order to get to the beginning virtual address of the
204 # Code:
205 pc_sub=$(( (($marker - 1) / (2 * $width + 1)) * $width ))
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206 echo All code >> $T.oo
207 echo ======== >> $T.oo
208 beforemark=`echo "$code"`
5358db0b 209 echo -n " .$type 0x" > $T.s
765f2bf0 210
5358db0b 211 echo $beforemark | sed -e 's/ /,0x/g; s/[<>()]//g' >> $T.s
765f2bf0 212
d72e720a 213 disas $T $pc_sub
765f2bf0 214
5358db0b 215 cat $T.dis >> $T.oo
dcecc6c7 216
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217 get_faultlinenum "$code" "$T.dis" $pc_sub
218 faultlinenum=$?
219
220 # and fix code at-and-after marker
dcecc6c7 221 code=`echo "$code" | cut -c$((${marker} + 1))-`
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222
223 rm -f $T.o $T.s $T.dis
dcecc6c7 224fi
765f2bf0 225
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226echo Code starting with the faulting instruction > $T.aa
227echo =========================================== >> $T.aa
75e2f715 228code=`echo $code | sed -e 's/\r//;s/ [<(]/ /;s/[>)] / /;s/ /,0x/g; s/[>)]$//'`
5358db0b 229echo -n " .$type 0x" > $T.s
dcecc6c7 230echo $code >> $T.s
d72e720a 231disas $T 0
5358db0b 232cat $T.dis >> $T.aa
846442c8 233
e08df079 234cat $T.oo | sed -e "${faultlinenum}s/^\([^:]*:\)\(.*\)/\1\*\2\t\t<-- trapping instruction/"
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235echo
236cat $T.aa
237cleanup