From 01573e231f18eb2d99162747186f59511f56b64d Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Fri, 08 Dec 2023 10:40:48 +0000
Subject: [PATCH] 移去rt
---
kernel/arch/powerpc/tools/unrel_branch_check.sh | 112 +++++++++++++++++++++++++++++++++----------------------
1 files changed, 67 insertions(+), 45 deletions(-)
diff --git a/kernel/arch/powerpc/tools/unrel_branch_check.sh b/kernel/arch/powerpc/tools/unrel_branch_check.sh
index 7711475..8301efe 100755
--- a/kernel/arch/powerpc/tools/unrel_branch_check.sh
+++ b/kernel/arch/powerpc/tools/unrel_branch_check.sh
@@ -1,57 +1,79 @@
-# Copyright © 2016 IBM Corporation
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0+
+# Copyright © 2016,2020 IBM Corporation
#
-# 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; either version
-# 2 of the License, or (at your option) any later version.
-#
-# This script checks the relocations of a vmlinux for "suspicious"
-# branches from unrelocated code (head_64.S code).
+# This script checks the unrelocated code of a vmlinux for "suspicious"
+# branches to relocated code (head_64.S code).
-# Turn this on if you want more debug output:
-# set -x
-
-# Have Kbuild supply the path to objdump so we handle cross compilation.
+# Have Kbuild supply the path to objdump and nm so we handle cross compilation.
objdump="$1"
-vmlinux="$2"
+nm="$2"
+vmlinux="$3"
-#__end_interrupts should be located within the first 64K
+kstart=0xc000000000000000
-end_intr=0x$(
-$objdump -R "$vmlinux" -d --start-address=0xc000000000000000 \
- --stop-address=0xc000000000010000 |
-grep '\<__end_interrupts>:' |
-awk '{print $1}'
-)
+end_intr=0x$($nm -p "$vmlinux" |
+ sed -E -n '/\s+[[:alpha:]]\s+__end_interrupts\s*$/{s///p;q}')
+if [ "$end_intr" = "0x" ]; then
+ exit 0
+fi
-BRANCHES=$(
-$objdump -R "$vmlinux" -D --start-address=0xc000000000000000 \
- --stop-address=${end_intr} |
-grep -e "^c[0-9a-f]*:[[:space:]]*\([0-9a-f][0-9a-f][[:space:]]\)\{4\}[[:space:]]*b" |
-grep -v '\<__start_initialization_multiplatform>' |
-grep -v -e 'b.\?.\?ctr' |
-grep -v -e 'b.\?.\?lr' |
-sed 's/://' |
-awk '{ print $1 ":" $6 ":0x" $7 ":" $8 " "}'
-)
+# we know that there is a correct branch to
+# __start_initialization_multiplatform, so find its address
+# so we can exclude it.
+sim=0x$($nm -p "$vmlinux" |
+ sed -E -n '/\s+[[:alpha:]]\s+__start_initialization_multiplatform\s*$/{s///p;q}')
-for tuple in $BRANCHES
-do
- from=`echo $tuple | cut -d':' -f1`
- branch=`echo $tuple | cut -d':' -f2`
- to=`echo $tuple | cut -d':' -f3 | sed 's/cr[0-7],//'`
- sym=`echo $tuple | cut -d':' -f4`
+$objdump -D --no-show-raw-insn --start-address="$kstart" --stop-address="$end_intr" "$vmlinux" |
+sed -E -n '
+# match lines that start with a kernel address
+/^c[0-9a-f]*:\s*b/ {
+ # drop branches via ctr or lr
+ /\<b.?.?(ct|l)r/d
+ # cope with some differences between Clang and GNU objdumps
+ s/\<bt.?\s*[[:digit:]]+,/beq/
+ s/\<bf.?\s*[[:digit:]]+,/bne/
+ # tidy up
+ s/\s0x/ /
+ s/://
+ # format for the loop below
+ s/^(\S+)\s+(\S+)\s+(\S+)\s*(\S*).*$/\1:\2:\3:\4/
+ # strip out condition registers
+ s/:cr[0-7],/:/
+ p
+}' | {
- if (( $to > $end_intr ))
- then
- if [ -z "$bad_branches" ]; then
- echo "WARNING: Unrelocated relative branches"
- bad_branches="yes"
+all_good=true
+while IFS=: read -r from branch to sym; do
+ case "$to" in
+ c*) to="0x$to"
+ ;;
+ .+*)
+ to=${to#.+}
+ if [ "$branch" = 'b' ]; then
+ if (( to >= 0x2000000 )); then
+ to=$(( to - 0x4000000 ))
+ fi
+ elif (( to >= 0x8000 )); then
+ to=$(( to - 0x10000 ))
fi
- echo "$from $branch-> $to $sym"
+ printf -v to '0x%x' $(( "0x$from" + to ))
+ ;;
+ *) printf 'Unkown branch format\n'
+ ;;
+ esac
+ if [ "$to" = "$sim" ]; then
+ continue
+ fi
+ if (( to > end_intr )); then
+ if $all_good; then
+ printf '%s\n' 'WARNING: Unrelocated relative branches'
+ all_good=false
+ fi
+ printf '%s %s-> %s %s\n' "$from" "$branch" "$to" "$sym"
fi
done
-if [ -z "$bad_branches" ]; then
- exit 0
-fi
+$all_good
+
+}
--
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