1 files changed, 141 insertions, 0 deletions

diff --git a/scripts/objdiff b/scripts/objdiff
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index 000000000000..b3e4f10bfc3e
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+++ b/scripts/objdiff
@@ -0,0 +1,141 @@
+#!/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