Michael Ellerman | 5c02cd2 | 2008-04-24 12:08:22 +1000 | [diff] [blame] | 1 | #!/bin/sh |
| 2 | # |
| 3 | # Copyright © 2008 IBM Corporation |
| 4 | # |
| 5 | # This program is free software; you can redistribute it and/or |
| 6 | # modify it under the terms of the GNU General Public License |
| 7 | # as published by the Free Software Foundation; either version |
| 8 | # 2 of the License, or (at your option) any later version. |
| 9 | |
| 10 | # This script checks prom_init.o to see what external symbols it |
| 11 | # is using, if it finds symbols not in the whitelist it returns |
| 12 | # an error. The point of this is to discourage people from |
| 13 | # intentionally or accidentally adding new code to prom_init.c |
| 14 | # which has side effects on other parts of the kernel. |
| 15 | |
| 16 | # If you really need to reference something from prom_init.o add |
| 17 | # it to the list below: |
| 18 | |
| 19 | WHITELIST="add_reloc_offset __bss_start __bss_stop copy_and_flush |
| 20 | _end enter_prom memcpy memset reloc_offset __secondary_hold |
| 21 | __secondary_hold_acknowledge __secondary_hold_spinloop __start |
| 22 | strcmp strcpy strlcpy strlen strncmp strstr logo_linux_clut224 |
Kumar Gala | a3ba68f | 2008-10-20 03:16:55 +0000 | [diff] [blame] | 23 | reloc_got2 kernstart_addr memstart_addr" |
Michael Ellerman | 5c02cd2 | 2008-04-24 12:08:22 +1000 | [diff] [blame] | 24 | |
| 25 | NM="$1" |
| 26 | OBJ="$2" |
| 27 | |
| 28 | ERROR=0 |
| 29 | |
| 30 | for UNDEF in $($NM -u $OBJ | awk '{print $2}') |
| 31 | do |
| 32 | # On 64-bit nm gives us the function descriptors, which have |
| 33 | # a leading . on the name, so strip it off here. |
| 34 | UNDEF="${UNDEF#.}" |
| 35 | |
| 36 | if [ $KBUILD_VERBOSE ]; then |
| 37 | if [ $KBUILD_VERBOSE -ne 0 ]; then |
| 38 | echo "Checking prom_init.o symbol '$UNDEF'" |
| 39 | fi |
| 40 | fi |
| 41 | |
| 42 | OK=0 |
| 43 | for WHITE in $WHITELIST |
| 44 | do |
| 45 | if [ "$UNDEF" = "$WHITE" ]; then |
| 46 | OK=1 |
| 47 | break |
| 48 | fi |
| 49 | done |
| 50 | |
Kumar Gala | da3de6d | 2008-06-13 07:20:58 +1000 | [diff] [blame] | 51 | # ignore register save/restore funcitons |
| 52 | if [ "${UNDEF:0:9}" = "_restgpr_" ]; then |
| 53 | OK=1 |
| 54 | fi |
| 55 | if [ "${UNDEF:0:11}" = "_rest32gpr_" ]; then |
| 56 | OK=1 |
| 57 | fi |
| 58 | if [ "${UNDEF:0:9}" = "_savegpr_" ]; then |
| 59 | OK=1 |
| 60 | fi |
| 61 | if [ "${UNDEF:0:11}" = "_save32gpr_" ]; then |
| 62 | OK=1 |
| 63 | fi |
| 64 | |
Michael Ellerman | 5c02cd2 | 2008-04-24 12:08:22 +1000 | [diff] [blame] | 65 | if [ $OK -eq 0 ]; then |
| 66 | ERROR=1 |
| 67 | echo "Error: External symbol '$UNDEF' referenced" \ |
| 68 | "from prom_init.c" >&2 |
| 69 | fi |
| 70 | done |
| 71 | |
| 72 | exit $ERROR |