4ea80652dc
Direct banches from code below __end_interrupts to code above
__end_interrupts when built with CONFIG_RELOCATABLE are disallowed
because they will break when the kernel is not located at 0.
Sample output:
WARNING: Unrelocated relative branches
c000000000000118 bl-> 0xc000000000038fb8 <pnv_restore_hyp_resource>
c00000000000013c b-> 0xc0000000001068a4 <kvm_start_guest>
c000000000000148 b-> 0xc00000000003919c <pnv_wakeup_loss>
c00000000000014c b-> 0xc00000000003923c <pnv_wakeup_noloss>
c0000000000005a4 b-> 0xc000000000106ffc <kvmppc_interrupt_hv>
c000000000001af0 b-> 0xc000000000106ffc <kvmppc_interrupt_hv>
c000000000001b24 b-> 0xc000000000106ffc <kvmppc_interrupt_hv>
c000000000001b58 b-> 0xc000000000106ffc <kvmppc_interrupt_hv>
Signed-off-by: Balbir Singh <bsingharora@gmail.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
57 lines
1.5 KiB
Bash
Executable file
57 lines
1.5 KiB
Bash
Executable file
# Copyright © 2016 IBM Corporation
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation; either version
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# 2 of the License, or (at your option) any later version.
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#
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# This script checks the relocations of a vmlinux for "suspicious"
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# branches from unrelocated code (head_64.S code).
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# Turn this on if you want more debug output:
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# set -x
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# Have Kbuild supply the path to objdump so we handle cross compilation.
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objdump="$1"
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vmlinux="$2"
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#__end_interrupts should be located within the first 64K
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end_intr=0x$(
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"$objdump" -R "$vmlinux" -d --start-address=0xc000000000000000 \
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--stop-address=0xc000000000010000 |
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grep '\<__end_interrupts>:' |
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awk '{print $1}'
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)
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BRANCHES=$(
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"$objdump" -R "$vmlinux" -D --start-address=0xc000000000000000 \
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--stop-address=${end_intr} |
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grep -e "^c[0-9a-f]*:[[:space:]]*\([0-9a-f][0-9a-f][[:space:]]\)\{4\}[[:space:]]*b" |
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grep -v '\<__start_initialization_multiplatform>' |
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grep -v -e 'b.\?.\?ctr' |
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grep -v -e 'b.\?.\?lr' |
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sed 's/://' |
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awk '{ print $1 ":" $6 ":0x" $7 ":" $8 " "}'
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)
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for tuple in $BRANCHES
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do
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from=`echo $tuple | cut -d':' -f1`
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branch=`echo $tuple | cut -d':' -f2`
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to=`echo $tuple | cut -d':' -f3 | sed 's/cr[0-7],//'`
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sym=`echo $tuple | cut -d':' -f4`
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if (( $to > $end_intr ))
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then
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if [ -z "$bad_branches" ]; then
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echo "WARNING: Unrelocated relative branches"
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bad_branches="yes"
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fi
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echo "$from $branch-> $to $sym"
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fi
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done
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if [ -z "$bad_branches" ]; then
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exit 0
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fi
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