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Linux/scripts/objdiff

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  1 #!/bin/bash
  2 # SPDX-License-Identifier: GPL-2.0-only
  3 
  4 # objdiff - a small script for validating that a commit or series of commits
  5 # didn't change object code.
  6 #
  7 # Copyright 2014, Jason Cooper <jason@lakedaemon.net>
  8 #
  9 
 10 # usage example:
 11 #
 12 # $ git checkout COMMIT_A
 13 # $ <your fancy build command here>
 14 # $ ./scripts/objdiff record path/to/*.o
 15 #
 16 # $ git checkout COMMIT_B
 17 # $ <your fancy build command here>
 18 # $ ./scripts/objdiff record path/to/*.o
 19 #
 20 # $ ./scripts/objdiff diff COMMIT_A COMMIT_B
 21 # $
 22 
 23 # And to clean up (everything is in .objdiff/*)
 24 # $ ./scripts/objdiff clean all
 25 #
 26 # Note: 'make mrproper' will also remove .objdiff
 27 
 28 SRCTREE=$(cd $(git rev-parse --show-toplevel 2>/dev/null); pwd)
 29 
 30 if [ -z "$SRCTREE" ]; then
 31         echo >&2 "ERROR: Not a git repository."
 32         exit 1
 33 fi
 34 
 35 TMPD=$SRCTREE/.objdiff
 36 
 37 usage() {
 38         echo >&2 "Usage: $0 <command> <args>"
 39         echo >&2 "  record    <list of object files or directories>"
 40         echo >&2 "  diff      <commitA> <commitB>"
 41         echo >&2 "  clean     all | <commit>"
 42         exit 1
 43 }
 44 
 45 get_output_dir() {
 46         dir=${1%/*}
 47 
 48         if [ "$dir" = "$1" ]; then
 49                 dir=.
 50         fi
 51 
 52         dir=$(cd $dir; pwd)
 53 
 54         echo $TMPD/$CMT${dir#$SRCTREE}
 55 }
 56 
 57 do_objdump() {
 58         dir=$(get_output_dir $1)
 59         base=${1##*/}
 60         stripped=$dir/${base%.o}.stripped
 61         dis=$dir/${base%.o}.dis
 62 
 63         [ ! -d "$dir" ] && mkdir -p $dir
 64 
 65         # remove addresses for a cleaner diff
 66         # http://dummdida.tumblr.com/post/60924060451/binary-diff-between-libc-from-scientificlinux-and
 67         $STRIP -g $1 -R __bug_table -R .note -R .comment -o $stripped
 68         $OBJDUMP -D $stripped | sed -e "s/^[[:space:]]\+[0-9a-f]\+//" -e "s:^$stripped:$1:" > $dis
 69 }
 70 
 71 dorecord() {
 72         [ $# -eq 0 ] && usage
 73 
 74         FILES="$*"
 75 
 76         CMT="`git rev-parse --short HEAD`"
 77 
 78         STRIP="${CROSS_COMPILE}strip"
 79         OBJDUMP="${CROSS_COMPILE}objdump"
 80 
 81         for d in $FILES; do
 82                 if [ -d "$d" ]; then
 83                         for f in $(find $d -name '*.o')
 84                         do
 85                                 do_objdump $f
 86                         done
 87                 else
 88                         do_objdump $d
 89                 fi
 90         done
 91 }
 92 
 93 dodiff() {
 94         [ $# -ne 2 ] && [ $# -ne 0 ] && usage
 95 
 96         if [ $# -eq 0 ]; then
 97                 SRC="`git rev-parse --short HEAD^`"
 98                 DST="`git rev-parse --short HEAD`"
 99         else
100                 SRC="`git rev-parse --short $1`"
101                 DST="`git rev-parse --short $2`"
102         fi
103 
104         DIFF="`which colordiff`"
105 
106         if [ ${#DIFF} -eq 0 ] || [ ! -x "$DIFF" ]; then
107                 DIFF="`which diff`"
108         fi
109 
110         SRCD="$TMPD/$SRC"
111         DSTD="$TMPD/$DST"
112 
113         if [ ! -d "$SRCD" ]; then
114                 echo >&2 "ERROR: $SRCD doesn't exist"
115                 exit 1
116         fi
117 
118         if [ ! -d "$DSTD" ]; then
119                 echo >&2 "ERROR: $DSTD doesn't exist"
120                 exit 1
121         fi
122 
123         $DIFF -Nurd $SRCD $DSTD
124 }
125 
126 doclean() {
127         [ $# -eq 0 ] && usage
128         [ $# -gt 1 ] && usage
129 
130         if [ "x$1" = "xall" ]; then
131                 rm -rf $TMPD/*
132         else
133                 CMT="`git rev-parse --short $1`"
134 
135                 if [ -d "$TMPD/$CMT" ]; then
136                         rm -rf $TMPD/$CMT
137                 else
138                         echo >&2 "$CMT not found"
139                 fi
140         fi
141 }
142 
143 [ $# -eq 0 ] && usage
144 
145 case "$1" in
146         record)
147                 shift
148                 dorecord $*
149                 ;;
150         diff)
151                 shift
152                 dodiff $*
153                 ;;
154         clean)
155                 shift
156                 doclean $*
157                 ;;
158         *)
159                 echo >&2 "Unrecognized command '$1'"
160                 exit 1
161                 ;;
162 esac

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