Commit | Line | Data |
---|---|---|
5c02cd2f | 1 | #!/bin/sh |
2874c5fd | 2 | # SPDX-License-Identifier: GPL-2.0-or-later |
5c02cd2f ME |
3 | # |
4 | # Copyright © 2008 IBM Corporation | |
5 | # | |
5c02cd2f ME |
6 | |
7 | # This script checks prom_init.o to see what external symbols it | |
8 | # is using, if it finds symbols not in the whitelist it returns | |
9 | # an error. The point of this is to discourage people from | |
10 | # intentionally or accidentally adding new code to prom_init.c | |
11 | # which has side effects on other parts of the kernel. | |
12 | ||
13 | # If you really need to reference something from prom_init.o add | |
14 | # it to the list below: | |
15 | ||
26deb043 CL |
16 | grep "^CONFIG_KASAN=y$" .config >/dev/null |
17 | if [ $? -eq 0 ] | |
18 | then | |
19 | MEM_FUNCS="__memcpy __memset" | |
20 | else | |
21 | MEM_FUNCS="memcpy memset" | |
22 | fi | |
23 | ||
5c02cd2f | 24 | WHITELIST="add_reloc_offset __bss_start __bss_stop copy_and_flush |
26deb043 | 25 | _end enter_prom $MEM_FUNCS reloc_offset __secondary_hold |
5c02cd2f | 26 | __secondary_hold_acknowledge __secondary_hold_spinloop __start |
c21f5a9e | 27 | logo_linux_clut224 btext_prepare_BAT |
27f44888 | 28 | reloc_got2 kernstart_addr memstart_addr linux_banner _stext |
e2500be2 | 29 | __prom_init_toc_start __prom_init_toc_end btext_setup_display TOC." |
5c02cd2f ME |
30 | |
31 | NM="$1" | |
32 | OBJ="$2" | |
33 | ||
34 | ERROR=0 | |
35 | ||
858805b3 | 36 | check_section() |
2c51d97e BH |
37 | { |
38 | file=$1 | |
39 | section=$2 | |
40 | size=$(objdump -h -j $section $file 2>/dev/null | awk "\$2 == \"$section\" {print \$3}") | |
41 | size=${size:-0} | |
42 | if [ $size -ne 0 ]; then | |
43 | ERROR=1 | |
44 | echo "Error: Section $section not empty in prom_init.c" >&2 | |
45 | fi | |
46 | } | |
47 | ||
5c02cd2f ME |
48 | for UNDEF in $($NM -u $OBJ | awk '{print $2}') |
49 | do | |
50 | # On 64-bit nm gives us the function descriptors, which have | |
51 | # a leading . on the name, so strip it off here. | |
52 | UNDEF="${UNDEF#.}" | |
53 | ||
54 | if [ $KBUILD_VERBOSE ]; then | |
55 | if [ $KBUILD_VERBOSE -ne 0 ]; then | |
56 | echo "Checking prom_init.o symbol '$UNDEF'" | |
57 | fi | |
58 | fi | |
59 | ||
60 | OK=0 | |
61 | for WHITE in $WHITELIST | |
62 | do | |
63 | if [ "$UNDEF" = "$WHITE" ]; then | |
64 | OK=1 | |
65 | break | |
66 | fi | |
67 | done | |
68 | ||
da3de6df | 69 | # ignore register save/restore funcitons |
fe921c8c AS |
70 | case $UNDEF in |
71 | _restgpr_*|_restgpr0_*|_rest32gpr_*) | |
da3de6df | 72 | OK=1 |
fe921c8c AS |
73 | ;; |
74 | _savegpr_*|_savegpr0_*|_save32gpr_*) | |
da3de6df | 75 | OK=1 |
fe921c8c AS |
76 | ;; |
77 | esac | |
da3de6df | 78 | |
5c02cd2f ME |
79 | if [ $OK -eq 0 ]; then |
80 | ERROR=1 | |
81 | echo "Error: External symbol '$UNDEF' referenced" \ | |
82 | "from prom_init.c" >&2 | |
83 | fi | |
84 | done | |
85 | ||
2c51d97e BH |
86 | check_section $OBJ .data |
87 | check_section $OBJ .bss | |
88 | check_section $OBJ .init.data | |
89 | ||
5c02cd2f | 90 | exit $ERROR |