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Directory :  /lib/modules/3.13.0-170-generic/build/arch/powerpc/kernel/

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Current File : /lib/modules/3.13.0-170-generic/build/arch/powerpc/kernel/prom_init_check.sh
#!/bin/sh
#
# Copyright © 2008 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 prom_init.o to see what external symbols it
# is using, if it finds symbols not in the whitelist it returns
# an error. The point of this is to discourage people from
# intentionally or accidentally adding new code to prom_init.c
# which has side effects on other parts of the kernel.

# If you really need to reference something from prom_init.o add
# it to the list below:

WHITELIST="add_reloc_offset __bss_start __bss_stop copy_and_flush
_end enter_prom memcpy memset reloc_offset __secondary_hold
__secondary_hold_acknowledge __secondary_hold_spinloop __start
strcmp strcpy strlcpy strlen strncmp strstr logo_linux_clut224
reloc_got2 kernstart_addr memstart_addr linux_banner _stext
opal_query_takeover opal_do_takeover opal_enter_rtas opal_secondary_entry
boot_command_line __prom_init_toc_start __prom_init_toc_end
btext_setup_display"

NM="$1"
OBJ="$2"

ERROR=0

for UNDEF in $($NM -u $OBJ | awk '{print $2}')
do
	# On 64-bit nm gives us the function descriptors, which have
	# a leading . on the name, so strip it off here.
	UNDEF="${UNDEF#.}"

	if [ $KBUILD_VERBOSE ]; then
		if [ $KBUILD_VERBOSE -ne 0 ]; then
			echo "Checking prom_init.o symbol '$UNDEF'"
		fi
	fi

	OK=0
	for WHITE in $WHITELIST
	do
		if [ "$UNDEF" = "$WHITE" ]; then
			OK=1
			break
		fi
	done

	# ignore register save/restore funcitons
	if [ "${UNDEF:0:9}" = "_restgpr_" ]; then
		OK=1
	fi
	if [ "${UNDEF:0:10}" = "_restgpr0_" ]; then
		OK=1
	fi
	if [ "${UNDEF:0:11}" = "_rest32gpr_" ]; then
		OK=1
	fi
	if [ "${UNDEF:0:9}" = "_savegpr_" ]; then
		OK=1
	fi
	if [ "${UNDEF:0:10}" = "_savegpr0_" ]; then
		OK=1
	fi
	if [ "${UNDEF:0:11}" = "_save32gpr_" ]; then
		OK=1
	fi

	if [ $OK -eq 0 ]; then
		ERROR=1
		echo "Error: External symbol '$UNDEF' referenced" \
		     "from prom_init.c" >&2
	fi
done

exit $ERROR

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