| #!/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 |
