da3de6df33
GCC 4.4.x looks to be adding support for generating out-of-line register saves/restores based on: http://gcc.gnu.org/ml/gcc-patches/2008-04/msg01678.html This breaks the kernel if we enable CONFIG_CC_OPTIMIZE_FOR_SIZE. To fix this we add the use the save/restore code from gcc and simplified it down for our needs (integer only). Additionally, we have to link this code into each module. The other solution was to add EXPORT_SYMBOL() which meant going through the trampoline which seemed nonsensical for these out-of-line routines. Finally, we add some checks to prom_init_check.sh to ignore the out-of-line save/restore functions. Signed-off-by: Kumar Gala <galak@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
72 lines
1.8 KiB
Bash
72 lines
1.8 KiB
Bash
#!/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"
|
|
|
|
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 [ "${UNDEF:0:11}" = "_rest32gpr_" ]; then
|
|
OK=1
|
|
fi
|
|
if [ "${UNDEF:0:9}" = "_savegpr_" ]; 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
|