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5c02cd2f ME |
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 | |
e7943fbb | 23 | reloc_got2 kernstart_addr memstart_addr linux_banner" |
5c02cd2f ME |
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" = "$WHITE" ]; then | |
46 | OK=1 | |
47 | break | |
48 | fi | |
49 | done | |
50 | ||
da3de6df KG |
51 | # ignore register save/restore funcitons |
52 | if [ "${UNDEF:0:9}" = "_restgpr_" ]; then | |
53 | OK=1 | |
54 | fi | |
5afd878a SR |
55 | if [ "${UNDEF:0:10}" = "_restgpr0_" ]; then |
56 | OK=1 | |
57 | fi | |
da3de6df KG |
58 | if [ "${UNDEF:0:11}" = "_rest32gpr_" ]; then |
59 | OK=1 | |
60 | fi | |
61 | if [ "${UNDEF:0:9}" = "_savegpr_" ]; then | |
62 | OK=1 | |
63 | fi | |
5afd878a SR |
64 | if [ "${UNDEF:0:10}" = "_savegpr0_" ]; then |
65 | OK=1 | |
66 | fi | |
da3de6df KG |
67 | if [ "${UNDEF:0:11}" = "_save32gpr_" ]; then |
68 | OK=1 | |
69 | fi | |
70 | ||
5c02cd2f ME |
71 | if [ $OK -eq 0 ]; then |
72 | ERROR=1 | |
73 | echo "Error: External symbol '$UNDEF' referenced" \ | |
74 | "from prom_init.c" >&2 | |
75 | fi | |
76 | done | |
77 | ||
78 | exit $ERROR |