#!/bin/bash
# SPDX-License-Identifier: GPL-2.0-only

# objdiff - a small script for validating that a commit or series of commits
# didn't change object code.
#
# Copyright 2014, Jason Cooper <jason@lakedaemon.net>
#

# usage example:
#
# $ git checkout COMMIT_A
# $ <your fancy build command here>
# $ ./scripts/objdiff record path/to/*.o
#
# $ git checkout COMMIT_B
# $ <your fancy build command here>
# $ ./scripts/objdiff record path/to/*.o
#
# $ ./scripts/objdiff diff COMMIT_A COMMIT_B
# $

# And to clean up (everything is in .objdiff/*)
# $ ./scripts/objdiff clean all
#
# Note: 'make mrproper' will also remove .objdiff

SRCTREE=$(cd $(git rev-parse --show-toplevel 2>/dev/null); pwd)

if [ -z "$SRCTREE" ]; then
	echo >&2 "ERROR: Not a git repository."
	exit 1
fi

TMPD=$SRCTREE/.objdiff

usage() {
	echo >&2 "Usage: $0 <command> <args>"
	echo >&2 "  record    <list of object files or directories>"
	echo >&2 "  diff      <commitA> <commitB>"
	echo >&2 "  clean     all | <commit>"
	exit 1
}

get_output_dir() {
	dir=${1%/*}

	if [ "$dir" = "$1" ]; then
		dir=.
	fi

	dir=$(cd $dir; pwd)

	echo $TMPD/$CMT${dir#$SRCTREE}
}

do_objdump() {
	dir=$(get_output_dir $1)
	base=${1##*/}
	stripped=$dir/${base%.o}.stripped
	dis=$dir/${base%.o}.dis

	[ ! -d "$dir" ] && mkdir -p $dir

	# remove addresses for a cleaner diff
	# http://dummdida.tumblr.com/post/60924060451/binary-diff-between-libc-from-scientificlinux-and
	$STRIP -g $1 -R __bug_table -R .note -R .comment -o $stripped
	$OBJDUMP -D $stripped | sed -e "s/^[[:space:]]\+[0-9a-f]\+//" -e "s:^$stripped:$1:" > $dis
}

dorecord() {
	[ $# -eq 0 ] && usage

	FILES="$*"

	CMT="`git rev-parse --short HEAD`"

	STRIP="${CROSS_COMPILE}strip"
	OBJDUMP="${CROSS_COMPILE}objdump"

	for d in $FILES; do
		if [ -d "$d" ]; then
			for f in $(find $d -name '*.o')
			do
				do_objdump $f
			done
		else
			do_objdump $d
		fi
	done
}

dodiff() {
	[ $# -ne 2 ] && [ $# -ne 0 ] && usage

	if [ $# -eq 0 ]; then
		SRC="`git rev-parse --short HEAD^`"
		DST="`git rev-parse --short HEAD`"
	else
		SRC="`git rev-parse --short $1`"
		DST="`git rev-parse --short $2`"
	fi

	DIFF="`which colordiff`"

	if [ ${#DIFF} -eq 0 ] || [ ! -x "$DIFF" ]; then
		DIFF="`which diff`"
	fi

	SRCD="$TMPD/$SRC"
	DSTD="$TMPD/$DST"

	if [ ! -d "$SRCD" ]; then
		echo >&2 "ERROR: $SRCD doesn't exist"
		exit 1
	fi

	if [ ! -d "$DSTD" ]; then
		echo >&2 "ERROR: $DSTD doesn't exist"
		exit 1
	fi

	$DIFF -Nurd $SRCD $DSTD
}

doclean() {
	[ $# -eq 0 ] && usage
	[ $# -gt 1 ] && usage

	if [ "x$1" = "xall" ]; then
		rm -rf $TMPD/*
	else
		CMT="`git rev-parse --short $1`"

		if [ -d "$TMPD/$CMT" ]; then
			rm -rf $TMPD/$CMT
		else
			echo >&2 "$CMT not found"
		fi
	fi
}

[ $# -eq 0 ] &&	usage

case "$1" in
	record)
		shift
		dorecord $*
		;;
	diff)
		shift
		dodiff $*
		;;
	clean)
		shift
		doclean $*
		;;
	*)
		echo >&2 "Unrecognized command '$1'"
		exit 1
		;;
esac
alue='linux-3.14.y'>linux-3.14.y</option>
<option value='linux-3.15.y'>linux-3.15.y</option>
<option value='linux-3.16.y'>linux-3.16.y</option>
<option value='linux-3.17.y'>linux-3.17.y</option>
<option value='linux-3.18.y'>linux-3.18.y</option>
<option value='linux-3.19.y'>linux-3.19.y</option>
<option value='linux-3.2.y'>linux-3.2.y</option>
<option value='linux-3.3.y'>linux-3.3.y</option>
<option value='linux-3.4.y'>linux-3.4.y</option>
<option value='linux-3.5.y'>linux-3.5.y</option>
<option value='linux-3.6.y'>linux-3.6.y</option>
<option value='linux-3.7.y'>linux-3.7.y</option>
<option value='linux-3.8.y'>linux-3.8.y</option>
<option value='linux-3.9.y'>linux-3.9.y</option>
<option value='linux-4.0.y'>linux-4.0.y</option>
<option value='linux-4.1.y'>linux-4.1.y</option>
<option value='linux-4.10.y'>linux-4.10.y</option>
<option value='linux-4.11.y'>linux-4.11.y</option>
<option value='linux-4.12.y'>linux-4.12.y</option>
<option value='linux-4.13.y'>linux-4.13.y</option>
<option value='linux-4.14.y'>linux-4.14.y</option>
<option value='linux-4.15.y'>linux-4.15.y</option>
<option value='linux-4.16.y'>linux-4.16.y</option>
<option value='linux-4.17.y'>linux-4.17.y</option>
<option value='linux-4.18.y'>linux-4.18.y</option>
<option value='linux-4.19.y'>linux-4.19.y</option>
<option value='linux-4.2.y'>linux-4.2.y</option>
<option value='linux-4.20.y'>linux-4.20.y</option>
<option value='linux-4.3.y'>linux-4.3.y</option>
<option value='linux-4.4.y'>linux-4.4.y</option>
<option value='linux-4.5.y'>linux-4.5.y</option>
<option value='linux-4.6.y'>linux-4.6.y</option>
<option value='linux-4.7.y'>linux-4.7.y</option>
<option value='linux-4.8.y'>linux-4.8.y</option>
<option value='linux-4.9.y'>linux-4.9.y</option>
<option value='linux-5.0.y'>linux-5.0.y</option>
<option value='linux-5.1.y'>linux-5.1.y</option>
<option value='linux-5.10.y'>linux-5.10.y</option>
<option value='linux-5.11.y'>linux-5.11.y</option>
<option value='linux-5.12.y'>linux-5.12.y</option>
<option value='linux-5.13.y'>linux-5.13.y</option>
<option value='linux-5.14.y'>linux-5.14.y</option>
<option value='linux-5.15.y'>linux-5.15.y</option>
<option value='linux-5.16.y'>linux-5.16.y</option>
<option value='linux-5.17.y'>linux-5.17.y</option>
<option value='linux-5.18.y'>linux-5.18.y</option>
<option value='linux-5.19.y'>linux-5.19.y</option>
<option value='linux-5.2.y'>linux-5.2.y</option>
<option value='linux-5.3.y'>linux-5.3.y</option>
<option value='linux-5.4.y'>linux-5.4.y</option>
<option value='linux-5.5.y'>linux-5.5.y</option>
<option value='linux-5.6.y'>linux-5.6.y</option>
<option value='linux-5.7.y'>linux-5.7.y</option>
<option value='linux-5.8.y'>linux-5.8.y</option>
<option value='linux-5.9.y'>linux-5.9.y</option>
<option value='linux-6.0.y'>linux-6.0.y</option>
<option value='linux-6.1.y'>linux-6.1.y</option>
<option value='linux-6.10.y'>linux-6.10.y</option>
<option value='linux-6.11.y'>linux-6.11.y</option>
<option value='linux-6.12.y'>linux-6.12.y</option>
<option value='linux-6.13.y'>linux-6.13.y</option>
<option value='linux-6.14.y'>linux-6.14.y</option>
<option value='linux-6.15.y'>linux-6.15.y</option>
<option value='linux-6.16.y'>linux-6.16.y</option>
<option value='linux-6.17.y'>linux-6.17.y</option>
<option value='linux-6.18.y'>linux-6.18.y</option>
<option value='linux-6.19.y'>linux-6.19.y</option>
<option value='linux-6.2.y'>linux-6.2.y</option>
<option value='linux-6.3.y'>linux-6.3.y</option>
<option value='linux-6.4.y'>linux-6.4.y</option>
<option value='linux-6.5.y'>linux-6.5.y</option>
<option value='linux-6.6.y'>linux-6.6.y</option>
<option value='linux-6.7.y'>linux-6.7.y</option>
<option value='linux-6.8.y'>linux-6.8.y</option>
<option value='linux-6.9.y'>linux-6.9.y</option>
<option value='linux-rolling-lts'>linux-rolling-lts</option>
<option value='linux-rolling-stable'>linux-rolling-stable</option>
<option value='master'>master</option>
</select> <input type='submit' value='switch'/></form></td></tr>
<tr><td class='sub'>Hosts the 0x221E linux distro kernel.</td><td class='sub right'>Ubuntu</td></tr></table>
<table class='tabs'><tr><td>
<a href='/distro/kernel/'>summary</a><a href='/distro/kernel/refs/?id=36d4b36b69590fed99356a4426c940a253a93800'>refs</a><a class='active' href='/distro/kernel/log/arch/arc/kernel/process.c'>log</a><a href='/distro/kernel/tree/arch/arc/kernel/process.c?id=36d4b36b69590fed99356a4426c940a253a93800'>tree</a><a href='/distro/kernel/commit/arch/arc/kernel/process.c?id=36d4b36b69590fed99356a4426c940a253a93800'>commit</a><a href='/distro/kernel/diff/arch/arc/kernel/process.c?id=36d4b36b69590fed99356a4426c940a253a93800'>diff</a></td><td class='form'><form class='right' method='get' action='/distro/kernel/log/arch/arc/kernel/process.c'>
<input type='hidden' name='id' value='36d4b36b69590fed99356a4426c940a253a93800'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/distro/kernel/log/?id=36d4b36b69590fed99356a4426c940a253a93800'>root</a>/<a href='/distro/kernel/log/arch?id=36d4b36b69590fed99356a4426c940a253a93800'>arch</a>/<a href='/distro/kernel/log/arch/arc?id=36d4b36b69590fed99356a4426c940a253a93800'>arc</a>/<a href='/distro/kernel/log/arch/arc/kernel?id=36d4b36b69590fed99356a4426c940a253a93800'>kernel</a>/<a href='/distro/kernel/log/arch/arc/kernel/process.c?id=36d4b36b69590fed99356a4426c940a253a93800'>process.c</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/distro/kernel/log/arch/arc/kernel/process.c?id=36d4b36b69590fed99356a4426c940a253a93800&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2022-05-07 09:01:59 -0500'>2022-05-07</span></td><td><a href='/distro/kernel/commit/arch/arc/kernel/process.c?id=5bd2e97c868a8a44470950ed01846cab6328e540'>fork: Generalize PF_IO_WORKER handling</a></td><td>Eric W. Biederman</td></tr>
<tr><td><span title='2022-05-07 09:01:48 -0500'>2022-05-07</span></td><td><a href='/distro/kernel/commit/arch/arc/kernel/process.c?id=c5febea0956fd3874e8fb59c6f84d68f128d68f8'>fork: Pass struct kernel_clone_args into copy_thread</a></td><td>Eric W. Biederman</td></tr>
<tr><td><span title='2022-02-25 09:36:05 +0100'>2022-02-25</span></td><td><a href='/distro/kernel/commit/arch/arc/kernel/process.c?id=23fc539e81295b14b50c6ccc5baeb4f3d59d822d'>uaccess: fix type mismatch warnings from access_ok()</a></td><td>Arnd Bergmann</td></tr>
<tr><td><span title='2021-10-29 14:31:34 -0500'>2021-10-29</span></td><td><a href='/distro/kernel/commit/arch/arc/kernel/process.c?id=e21294a7aaae32c5d7154b187113a04db5852e37'>signal: Replace force_sigsegv(SIGSEGV) with force_fatal_sig(SIGSEGV)</a></td><td>Eric W. Biederman</td></tr>
<tr><td><span title='2021-05-10 12:38:59 -0700'>2021-05-10</span></td><td><a href='/distro/kernel/commit/arch/arc/kernel/process.c?id=f79f7a2d96769d2a3e663a3e673066be77c30cc3'>arc: Fix typos/spellos</a></td><td>Bhaskar Chowdhury</td></tr>
<tr><td><span title='2021-02-21 17:25:22 -0700'>2021-02-21</span></td><td><a href='/distro/kernel/commit/arch/arc/kernel/process.c?id=4727dc20e0422211a0e0c72b1ace4ed6096df8a6'>arch: setup PF_IO_WORKER threads like PF_KTHREAD</a></td><td>Jens Axboe</td></tr>
<tr><td><span title='2020-10-05 21:02:29 -0700'>2020-10-05</span></td><td><a href='/distro/kernel/commit/arch/arc/kernel/process.c?id=dd7c7ab01a04d645b7e7baa8530bfd81e31a2202'>ARC: [plat-eznps]: Drop support for EZChip NPS platform</a></td><td>Vineet Gupta</td></tr>
<tr><td><span title='2020-08-12 10:58:04 -0700'>2020-08-12</span></td><td><a href='/distro/kernel/commit/arch/arc/kernel/process.c?id=64019a2e467a288a16b65ab55ddcbf58c1b00187'>mm/gup: remove task_struct pointer for all gup code</a></td><td>Peter Xu</td></tr>
<tr><td><span title='2020-08-09 13:33:54 -0700'>2020-08-09</span></td><td><a href='/distro/kernel/commit/arch/arc/kernel/process.c?id=8d3e09b43312991c503478bf0f5f99e92c23ccf1'>Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs</a></td><td>Linus Torvalds</td></tr>
<tr><td><span title='2020-07-27 14:33:10 -0400'>2020-07-27</span></td><td><a href='/distro/kernel/commit/arch/arc/kernel/process.c?id=bb1a773d5b6bf018bf84fdb3fbba01d3ef54e2c9'>kill unused dump_fpu() instances</a></td><td>Al Viro</td></tr>
<tr><td><span title='2020-07-04 23:41:37 +0200'>2020-07-04</span></td><td><a href='/distro/kernel/commit/arch/arc/kernel/process.c?id=714acdbd1c94e7e3ab90f6b6938f1ccb27b662f0'>arch: rename copy_thread_tls() back to copy_thread()</a></td><td>Christian Brauner</td></tr>
<tr><td><span title='2020-06-09 09:39:14 -0700'>2020-06-09</span></td><td><a href='/distro/kernel/commit/arch/arc/kernel/process.c?id=d8ed45c5dcd455fc5848d47f86883a1b872ac0d0'>mmap locking API: use coccinelle to convert mmap_sem rwsem call sites</a></td><td>Michel Lespinasse</td></tr>
<tr><td><span title='2020-01-17 16:53:44 -0800'>2020-01-17</span></td><td><a href='/distro/kernel/commit/arch/arc/kernel/process.c?id=f45ba2bd6da0dc8000aa7ea7a3858fb51608f766'>ARCv2: fpu: preserve userspace fpu state</a></td><td>Vineet Gupta</td></tr>
<tr><td><span title='2020-01-15 16:08:12 -0800'>2020-01-15</span></td><td><a href='/distro/kernel/commit/arch/arc/kernel/process.c?id=bd71c453db91ecb464405411f2821d040f2a0d44'>ARC: wireup clone3 syscall</a></td><td>Vineet Gupta</td></tr>
<tr><td><span title='2019-07-08 21:48:15 -0700'>2019-07-08</span></td><td><a href='/distro/kernel/commit/arch/arc/kernel/process.c?id=5ad18b2e60b75c7297a998dea702451d33a052ed'>Merge branch 'siginfo-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...</a></td><td>Linus Torvalds</td></tr>
<tr><td><span title='2019-06-19 17:09:55 +0200'>2019-06-19</span></td><td><a href='/distro/kernel/commit/arch/arc/kernel/process.c?id=d2912cb15bdda8ba4a5dd73396ad62641af2f520'>treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500</a></td><td>Thomas Gleixner</td></tr>
<tr><td><span title='2019-05-27 09:36:28 -0500'>2019-05-27</span></td><td><a href='/distro/kernel/commit/arch/arc/kernel/process.c?id=3cf5d076fb4d48979f382bc9452765bf8b79e740'>signal: Remove task parameter from force_sig</a></td><td>Eric W. Biederman</td></tr>
<tr><td><span title='2019-05-27 09:36:28 -0500'>2019-05-27</span></td><td><a href='/distro/kernel/commit/arch/arc/kernel/process.c?id=cb44c9a0ab21a9ae4dfcabac1ed8e38aa872d1af'>signal: Remove task parameter from force_sigsegv</a></td><td>Eric W. Biederman</td></tr>
<tr><td><span title='2019-01-03 18:57:57 -0800'>2019-01-03</span></td><td><a href='/distro/kernel/commit/arch/arc/kernel/process.c?id=96d4f267e40f9509e8a66e2b39e8b95655617693'>Remove 'type' argument from access_ok() function</a></td><td>Linus Torvalds</td></tr>
<tr><td><span title='2018-10-05 14:33:29 -0700'>2018-10-05</span></td><td><a href='/distro/kernel/commit/arch/arc/kernel/process.c?id=c58a584f05e35d1d4342923cd7aac07d9c3d3d16'>ARC: clone syscall to setp r25 as thread pointer</a></td><td>Vineet Gupta</td></tr>
<tr><td><span title='2018-07-09 11:22:05 -0700'>2018-07-09</span></td><td><a href='/distro/kernel/commit/arch/arc/kernel/process.c?id=e8708786d4fe21c043d38d760f768949a3d71185'>ARC: Improve cmpxchg syscall implementation</a></td><td>Peter Zijlstra</td></tr>