This utility is used as part of Linux ACPICA release process. It may be a
good idea to add it to kernel scripts, since it may be generally usefull for
verifying small kernel changes, like coding style cleanups etc.
Signed-off-by: Lv Zheng <lv.zheng@xxxxxxxxx>
---
scripts/diffvmlinux.sh | 227 ++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 227 insertions(+)
create mode 100755 scripts/diffvmlinux.sh
Index: linux-pm/scripts/diffvmlinux.sh
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-pm/scripts/diffvmlinux.sh 2012-12-19 13:40:21.000000000 +0800
@@ -0,0 +1,226 @@
+#!/bin/sh
+#
+# Copyright (c) 2012, Intel Corporation
+# Author: Lv Zheng <lv.zheng@xxxxxxxxx>
+#
+# This program is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by the
+# Free Software Foundation; version 2 of the License.
+#
+# NAME
+# diffvmlinux.sh - Generating vmlinux assembly differences before/after
+# applying a quilt patch
+# SYNOPSIS
+# diffvmlinux.sh [-f assembly-diff] [-p patch-file] [-o object-file]
+# <linux-dir>
+
+
+# FIXME: More Useless Sections
+#
+# Please add other sections that would appear as executable but should get
+# removed for the comparision.
+USELESS_SECTIONS=".notes"
+
+fulldir() {
+ lpath=$1
+ (
+ cd $lpath; pwd
+ )
+}
+
+getdir() {
+ lpath=`dirname $1`
+ fulldir $lpath
+}
+
+fatal() {
+ echo $1
+ exit -1
+}
+
+usage() {
+ echo "Usage: `basename $0` [-p patch] <linux>"
+ echo "Where:"
+ echo " linux: Specify the linux source tree."
+ echo " patch: Specify the patch file name."
+}
+
+fatal_usage() {
+ usage
+ exit -1
+}
+
+quilt_applied() {
+ c=$1
+ applied_patches=`quilt applied 2>/dev/null`
+
+ for a in $applied_patches; do
+ if [ "x$a" = "x$c" ]; then
+ return 0
+ fi
+ done
+ return -1
+}
+
+remove_sections() {
+ binary2=$1
+ binary3=$2
+
+ for section in $USELESS_SECTIONS; do
+ echo "Removing $section section..."
+ objcopy -R $section $binary2 $binary3
+ mv $binary3 $binary2
+ done
+}
+
+quilt_push() {
+ quilt push > /dev/null || fatal "failed to push quilt stack"
+}
+
+quilt_pop() {
+ quilt pop > /dev/null || fatal "failed to pop quilt stack"
+}
+
+detect_patch() {
+ quilt_push
+ detected_patches=`quilt applied 2>/dev/null`
+ quilt_pop
+ for d in $detected_patches; do
+ quilt_applied $d || echo $d
+ done
+}
+
+quilt_forward() {
+ l=$1
+ patches=`quilt unapplied 2>/dev/null`
+ for i in $patches; do
+ quilt_push
+ quilt_applied $l
+ if [ $? -eq 0 ]; then
+ quilt_pop
+ return 0;
+ fi
+ done
+ fatal "Cannot find $locate in the unapplied patches."
+}
+
+quilt_backward() {
+ l=$1
+ patches=`quilt applied 2>/dev/null`
+ for i in $patches; do
+ quilt_pop
+ quilt_applied $l || return 0
+ done
+ fatal "Cannot find $locate in the applied patches."
+}
+
+locate_patch() {
+ t=$1
+ quilt_applied $t
+ if [ $? -eq 0 ]; then
+ echo "Locating $t in the applied patches..."
+ quilt_backward $t
+ else
+ echo "Locating $t in the unapplied patches..."
+ quilt_forward $t
+ fi
+}
+
+while getopts "f:p:o:" opt
+do
+ case $opt in
+ f) ASMDIFF=$OPTARG;;
+ o) BINARY=$OPTARG;;
+ p) PATCH=$OPTARG;;
+ ?) echo "Invalid argument $opt"
+ fatal_usage;;
+ esac
+done
+shift $(($OPTIND - 1))
+
+if [ "x$1" = "x" ]; then
+ echo "Missing <linux> paraemter."
+ fatal_usage
+fi
+
+CURDIR=`pwd`
+LINUX=`getdir $1`
+LINUX_BASE=`basename $LINUX`/vmlinux
+AFTER=$CURDIR/after.dump
+BEFORE=$CURDIR/before.dump
+
+if [ "x$BINARY" = "x" ]; then
+ BINARY=vmlinux
+fi
+echo "Diffing $BINARY..."
+BINARY0=$LINUX/$BINARY
+BINARY1=$LINUX/diffvmlinux
+BINARY2=$LINUX/diffvmlinux-nosections
+BINARY3=$LINUX/diffvmlinux-nosection
+
+# Prepare quilt stack
+if [ "x$PATCH" != "x" ]; then
+ echo "Locating patch $PATCH..."
+ locate_patch $PATCH
+else
+ PATCH=`detect_patch`
+ echo "Detected patch $PATCH."
+fi
+if [ "x$PATCH" = "x" ]; then
+ echo "Missing patch file"
+ fatal_usage
+fi
+
+# Allow overloading of ASMDIFF
+if [ "x$ASMDIFF" = "x" ]; then
+ ASMDIFF=$CURDIR/bin.diff
+fi
+
+(
+ cd $LINUX
+
+ # Assertion in case the above locating/detecting failed.
+ quilt_applied $PATCH && fatal "patch $PATCH should not be applied"
+ quilt_push
+ quilt_applied $PATCH || fatal "patch $PATCH should be the next patch"
+ quilt_pop
+
+ echo "Building $BINARY before applying $PATCH..."
+ rm -f $BINARY
+ make > /dev/null || fatal "failed to build $LINUX"
+ echo "Disassembling $BINARY before applying $PATCH..."
+ cp -f $BINARY0 $BINARY1
+ cp -f $BINARY1 $BINARY2 && remove_sections $BINARY2 $BINARY3
+ objdump -d $BINARY2 > $BEFORE
+
+ echo "Pushing $PATCH to $LINUX_BASE..."
+ quilt_push
+
+ echo "Building $BINARY after applying $PATCH..."
+ rm -f $BINARY
+ make > /dev/null || fatal "failed to build $LINUX"
+ echo "Disassembling $BINARY after applying $PATCH..."
+ cp -f $BINARY0 $BINARY1
+ cp -f $BINARY1 $BINARY2 && remove_sections $BINARY2 $BINARY3
+ objdump -d $BINARY2 > $AFTER
+
+ echo "Popping $PATCH from $LINUX_BASE..."
+ quilt_pop
+)
+
+# XXX: Fatal Error for the Sub-shell
+#
+# We'll reach here even in the case of fatal due to the sub-shell.
+# Thus we do cleanup here and the relative path of ASMDIFF is correct.
+
+if [ -f $BEFORE ] && [ -f $AFTER ]; then
+ echo "Generating assembly differences..."
+ diff -u $BEFORE $AFTER > $ASMDIFF
+ echo "$ASMDIFF is ready."
+fi
+
+rm -f $BINARY1
+rm -f $BINARY2
+rm -f $BINARY3
+rm -f $BEFORE
+rm -f $AFTER
--
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