#!/bin/bash
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# SPDX-License-Identifier: GPL-2.0-only
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# objdiff - a small script for validating that a commit or series of commits
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# didn't change object code.
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#
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# Copyright 2014, Jason Cooper <jason@lakedaemon.net>
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#
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# usage example:
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#
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# $ git checkout COMMIT_A
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# $ <your fancy build command here>
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# $ ./scripts/objdiff record path/to/*.o
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#
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# $ git checkout COMMIT_B
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# $ <your fancy build command here>
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# $ ./scripts/objdiff record path/to/*.o
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#
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# $ ./scripts/objdiff diff COMMIT_A COMMIT_B
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# $
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# And to clean up (everything is in .tmp_objdiff/*)
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# $ ./scripts/objdiff clean all
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#
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# Note: 'make mrproper' will also remove .tmp_objdiff
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SRCTREE=$(cd $(git rev-parse --show-toplevel 2>/dev/null); pwd)
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if [ -z "$SRCTREE" ]; then
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echo >&2 "ERROR: Not a git repository."
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exit 1
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fi
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TMPD=$SRCTREE/.tmp_objdiff
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usage() {
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echo >&2 "Usage: $0 <command> <args>"
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echo >&2 " record <list of object files or directories>"
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echo >&2 " diff <commitA> <commitB>"
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echo >&2 " clean all | <commit>"
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exit 1
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}
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get_output_dir() {
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dir=${1%/*}
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if [ "$dir" = "$1" ]; then
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dir=.
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fi
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dir=$(cd $dir; pwd)
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echo $TMPD/$CMT${dir#$SRCTREE}
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}
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do_objdump() {
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dir=$(get_output_dir $1)
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base=${1##*/}
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stripped=$dir/${base%.o}.stripped
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dis=$dir/${base%.o}.dis
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[ ! -d "$dir" ] && mkdir -p $dir
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# remove addresses for a cleaner diff
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# http://dummdida.tumblr.com/post/60924060451/binary-diff-between-libc-from-scientificlinux-and
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$STRIP -g $1 -R __bug_table -R .note -R .comment -o $stripped
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$OBJDUMP -D $stripped | sed -e "s/^[[:space:]]\+[0-9a-f]\+//" -e "s:^$stripped:$1:" > $dis
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}
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dorecord() {
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[ $# -eq 0 ] && usage
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FILES="$*"
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CMT="`git rev-parse --short HEAD`"
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STRIP="${CROSS_COMPILE}strip"
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OBJDUMP="${CROSS_COMPILE}objdump"
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for d in $FILES; do
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if [ -d "$d" ]; then
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for f in $(find $d -name '*.o')
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do
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do_objdump $f
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done
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else
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do_objdump $d
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fi
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done
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}
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dodiff() {
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[ $# -ne 2 ] && [ $# -ne 0 ] && usage
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if [ $# -eq 0 ]; then
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SRC="`git rev-parse --short HEAD^`"
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DST="`git rev-parse --short HEAD`"
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else
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SRC="`git rev-parse --short $1`"
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DST="`git rev-parse --short $2`"
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fi
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DIFF="`which colordiff`"
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if [ ${#DIFF} -eq 0 ] || [ ! -x "$DIFF" ]; then
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DIFF="`which diff`"
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fi
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SRCD="$TMPD/$SRC"
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DSTD="$TMPD/$DST"
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if [ ! -d "$SRCD" ]; then
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echo >&2 "ERROR: $SRCD doesn't exist"
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exit 1
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fi
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if [ ! -d "$DSTD" ]; then
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echo >&2 "ERROR: $DSTD doesn't exist"
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exit 1
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fi
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$DIFF -Nurd $SRCD $DSTD
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}
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doclean() {
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[ $# -eq 0 ] && usage
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[ $# -gt 1 ] && usage
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if [ "x$1" = "xall" ]; then
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rm -rf $TMPD/*
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else
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CMT="`git rev-parse --short $1`"
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if [ -d "$TMPD/$CMT" ]; then
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rm -rf $TMPD/$CMT
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else
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echo >&2 "$CMT not found"
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fi
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fi
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}
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[ $# -eq 0 ] && usage
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case "$1" in
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record)
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shift
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dorecord $*
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;;
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diff)
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shift
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dodiff $*
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;;
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clean)
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shift
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doclean $*
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;;
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*)
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echo >&2 "Unrecognized command '$1'"
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exit 1
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;;
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esac
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