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#!/bin/bash
# Copyright © 2016 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).
# Turn this on if you want more debug output:
# set -x
# Have Kbuild supply the path to objdump so we handle cross compilation.
objdump="$1"
vmlinux="$2"
#__end_interrupts should be located within the first 64K
kstart=0xc000000000000000
printf -v kend '0x%x' $(( kstart + 0x10000 ))
end_intr=0x$(
$objdump -R -d --start-address="$kstart" --stop-address="$kend" "$vmlinux" |
awk '$2 == "<__end_interrupts>:" { print $1 }'
)
BRANCHES=$(
$objdump -R -D --no-show-raw-insn --start-address="$kstart" --stop-address="$end_intr" "$vmlinux" |
sed -E -n '
# match lines that start with a kernel address
/^c[0-9a-f]*:\s*b/ {
# drop a target that we do not care about
/\<__start_initialization_multiplatform>/d
# 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:\2:0x\3:\4/
# strip out condition registers
s/:0xcr[0-7],/:0x/
p
}'
)
for tuple in $BRANCHES; do
from=$(echo "$tuple" | cut -d':' -f1)
branch=$(echo "$tuple" | cut -d':' -f2)
to=$(echo "$tuple" | cut -d':' -f3)
sym=$(echo "$tuple" | cut -d':' -f4)
if (( to > end_intr )); then
if [ -z "$bad_branches" ]; then
echo "WARNING: Unrelocated relative branches"
bad_branches="yes"
fi
echo "$from $branch-> $to $sym"
fi
done
if [ -z "$bad_branches" ]; then
exit 0
fi
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