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-rwxr-xr-xscripts/objdiff141
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diff --git a/scripts/objdiff b/scripts/objdiff
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+#!/bin/bash
+
+# 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>
+#
+# Licensed under the terms of the GNU GPL version 2
+
+# 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 .tmp_objdiff/*)
+# $ ./scripts/objdiff clean all
+#
+# Note: 'make mrproper' will also remove .tmp_objdiff
+
+GIT_DIR="`git rev-parse --git-dir`"
+
+if [ -d "$GIT_DIR" ]; then
+ TMPD="${GIT_DIR%git}tmp_objdiff"
+
+ [ -d "$TMPD" ] || mkdir "$TMPD"
+else
+ echo "ERROR: git directory not found."
+ exit 1
+fi
+
+usage() {
+ echo "Usage: $0 <command> <args>"
+ echo " record <list of object files>"
+ echo " diff <commitA> <commitB>"
+ echo " clean all | <commit>"
+ exit 1
+}
+
+dorecord() {
+ [ $# -eq 0 ] && usage
+
+ FILES="$*"
+
+ CMT="`git rev-parse --short HEAD`"
+
+ OBJDUMP="${CROSS_COMPILE}objdump"
+ OBJDIFFD="$TMPD/$CMT"
+
+ [ ! -d "$OBJDIFFD" ] && mkdir -p "$OBJDIFFD"
+
+ for f in $FILES; do
+ dn="${f%/*}"
+ bn="${f##*/}"
+
+ [ ! -d "$OBJDIFFD/$dn" ] && mkdir -p "$OBJDIFFD/$dn"
+
+ # remove addresses for a more clear diff
+ # http://dummdida.tumblr.com/post/60924060451/binary-diff-between-libc-from-scientificlinux-and
+ $OBJDUMP -D "$f" | sed "s/^[[:space:]]\+[0-9a-f]\+//" \
+ >"$OBJDIFFD/$dn/$bn"
+ 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 "ERROR: $SRCD doesn't exist"
+ exit 1
+ fi
+
+ if [ ! -d "$DSTD" ]; then
+ echo "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 "$CMT not found"
+ fi
+ fi
+}
+
+[ $# -eq 0 ] && usage
+
+case "$1" in
+ record)
+ shift
+ dorecord $*
+ ;;
+ diff)
+ shift
+ dodiff $*
+ ;;
+ clean)
+ shift
+ doclean $*
+ ;;
+ *)
+ echo "Unrecognized command '$1'"
+ exit 1
+ ;;
+esac