OSCL-LXR

0001 #!/bin/bash
0002 # SPDX-License-Identifier: GPL-2.0-only
0003
0004 # objdiff - a small script for validating that a commit or series of commits
0005 # didn't change object code.
0006 #
0007 # Copyright 2014, Jason Cooper <jason@lakedaemon.net>
0008 #
0009
0010 # usage example:
0011 #
0012 # $ git checkout COMMIT_A
0013 # $ <your fancy build command here>
0014 # $ ./scripts/objdiff record path/to/*.o
0015 #
0016 # $ git checkout COMMIT_B
0017 # $ <your fancy build command here>
0018 # $ ./scripts/objdiff record path/to/*.o
0019 #
0020 # $ ./scripts/objdiff diff COMMIT_A COMMIT_B
0021 # $
0022
0023 # And to clean up (everything is in .objdiff/*)
0024 # $ ./scripts/objdiff clean all
0025 #
0026 # Note: 'make mrproper' will also remove .objdiff
0027
0028 SRCTREE=$(cd $(git rev-parse --show-toplevel 2>/dev/null); pwd)
0029
0030 if [ -z "$SRCTREE" ]; then
0031         echo >&2 "ERROR: Not a git repository."
0032         exit 1
0033 fi
0034
0035 TMPD=$SRCTREE/.objdiff
0036
0037 usage() {
0038         echo >&2 "Usage: $0 <command> <args>"
0039         echo >&2 "  record    <list of object files or directories>"
0040         echo >&2 "  diff      <commitA> <commitB>"
0041         echo >&2 "  clean     all | <commit>"
0042         exit 1
0043 }
0044
0045 get_output_dir() {
0046         dir=${1%/*}
0047
0048         if [ "$dir" = "$1" ]; then
0049                 dir=.
0050         fi
0051
0052         dir=$(cd $dir; pwd)
0053
0054         echo $TMPD/$CMT${dir#$SRCTREE}
0055 }
0056
0057 do_objdump() {
0058         dir=$(get_output_dir $1)
0059         base=${1##*/}
0060         stripped=$dir/${base%.o}.stripped
0061         dis=$dir/${base%.o}.dis
0062
0063         [ ! -d "$dir" ] && mkdir -p $dir
0064
0065         # remove addresses for a cleaner diff
0066         # http://dummdida.tumblr.com/post/60924060451/binary-diff-between-libc-from-scientificlinux-and
0067         $STRIP -g $1 -R __bug_table -R .note -R .comment -o $stripped
0068         $OBJDUMP -D $stripped | sed -e "s/^[[:space:]]\+[0-9a-f]\+//" -e "s:^$stripped:$1:" > $dis
0069 }
0070
0071 dorecord() {
0072         [ $# -eq 0 ] && usage
0073
0074         FILES="$*"
0075
0076         CMT="`git rev-parse --short HEAD`"
0077
0078         STRIP="${CROSS_COMPILE}strip"
0079         OBJDUMP="${CROSS_COMPILE}objdump"
0080
0081         for d in $FILES; do
0082                 if [ -d "$d" ]; then
0083                         for f in $(find $d -name '*.o')
0084                         do
0085                                 do_objdump $f
0086                         done
0087                 else
0088                         do_objdump $d
0089                 fi
0090         done
0091 }
0092
0093 dodiff() {
0094         [ $# -ne 2 ] && [ $# -ne 0 ] && usage
0095
0096         if [ $# -eq 0 ]; then
0097                 SRC="`git rev-parse --short HEAD^`"
0098                 DST="`git rev-parse --short HEAD`"
0099         else
0100                 SRC="`git rev-parse --short $1`"
0101                 DST="`git rev-parse --short $2`"
0102         fi
0103
0104         DIFF="`which colordiff`"
0105
0106         if [ ${#DIFF} -eq 0 ] || [ ! -x "$DIFF" ]; then
0107                 DIFF="`which diff`"
0108         fi
0109
0110         SRCD="$TMPD/$SRC"
0111         DSTD="$TMPD/$DST"
0112
0113         if [ ! -d "$SRCD" ]; then
0114                 echo >&2 "ERROR: $SRCD doesn't exist"
0115                 exit 1
0116         fi
0117
0118         if [ ! -d "$DSTD" ]; then
0119                 echo >&2 "ERROR: $DSTD doesn't exist"
0120                 exit 1
0121         fi
0122
0123         $DIFF -Nurd $SRCD $DSTD
0124 }
0125
0126 doclean() {
0127         [ $# -eq 0 ] && usage
0128         [ $# -gt 1 ] && usage
0129
0130         if [ "x$1" = "xall" ]; then
0131                 rm -rf $TMPD/*
0132         else
0133                 CMT="`git rev-parse --short $1`"
0134
0135                 if [ -d "$TMPD/$CMT" ]; then
0136                         rm -rf $TMPD/$CMT
0137                 else
0138                         echo >&2 "$CMT not found"
0139                 fi
0140         fi
0141 }
0142
0143 [ $# -eq 0 ] && usage
0144
0145 case "$1" in
0146         record)
0147                 shift
0148                 dorecord $*
0149                 ;;
0150         diff)
0151                 shift
0152                 dodiff $*
0153                 ;;
0154         clean)
0155                 shift
0156                 doclean $*
0157                 ;;
0158         *)
0159                 echo >&2 "Unrecognized command '$1'"
0160                 exit 1
0161                 ;;
0162 esac