Merge branch 'misc' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild

[linux.git] / scripts / objdiff

diff --git a/scripts/objdiff b/scripts/objdiff
new file mode 100755 (executable)
index 0000000..b3e4f10
--- /dev/null
+++ 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