cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

objdiff (2893B)

      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
     28SRCTREE=$(cd $(git rev-parse --show-toplevel 2>/dev/null); pwd)
     29
     30if [ -z "$SRCTREE" ]; then
     31	echo >&2 "ERROR: Not a git repository."
     32	exit 1
     33fi
     34
     35TMPD=$SRCTREE/.objdiff
     36
     37usage() {
     38	echo >&2 "Usage: $0 <command> <args>"
     39	echo >&2 "  record    <list of object files or directories>"
     40	echo >&2 "  diff      <commitA> <commitB>"
     41	echo >&2 "  clean     all | <commit>"
     42	exit 1
     43}
     44
     45get_output_dir() {
     46	dir=${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
     57do_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
     71dorecord() {
     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
     93dodiff() {
     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
    126doclean() {
    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
    145case "$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		;;
    162esac