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powerpc: Check prom_init for disallowed sections 

prom_init.c must not modify the kernel image outside
of the .bss.prominit section. Thus make sure that
prom_init.o doesn't have anything in any of these:

	.data
	.bss
	.init.data

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
hifive-unleashed-5.1
Benjamin Herrenschmidt 2018-10-15 13:49:59 +11:00 committed by Michael Ellerman
parent 5f69e38885
commit 2c51d97ee8
1 changed files with 16 additions and 0 deletions
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16
arch/powerpc/kernel/prom_init_check.sh
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@ -28,6 +28,18 @@ OBJ="$2"
ERROR=0
function check_section()
{
file=$1
section=$2
size=$(objdump -h -j $section $file 2>/dev/null | awk "\$2 == \"$section\" {print \$3}")
size=${size:-0}
if [ $size -ne 0 ]; then
ERROR=1
echo "Error: Section $section not empty in prom_init.c" >&2
fi
}
for UNDEF in $($NM -u $OBJ | awk '{print $2}')
do
# On 64-bit nm gives us the function descriptors, which have
@ -66,4 +78,8 @@ do
fi
done
check_section $OBJ .data
check_section $OBJ .bss
check_section $OBJ .init.data
exit $ERROR