Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
bd78c9d7 | 2 | #include <byteswap.h> |
58e01fca | 3 | #include <stdbool.h> |
1da177e4 LT |
4 | #include <stdio.h> |
5 | #include <stdlib.h> | |
6 | #include <stdarg.h> | |
7 | #include <string.h> | |
8 | #include <sys/types.h> | |
9 | #include <sys/stat.h> | |
10 | #include <sys/mman.h> | |
11 | #include <fcntl.h> | |
12 | #include <unistd.h> | |
13 | #include <elf.h> | |
40745327 | 14 | #include "../../include/linux/module_symbol.h" |
1da177e4 | 15 | |
325eba05 | 16 | #include "list.h" |
1da177e4 LT |
17 | #include "elfconfig.h" |
18 | ||
3c0561e0 PF |
19 | /* On BSD-alike OSes elf.h defines these according to host's word size */ |
20 | #undef ELF_ST_BIND | |
21 | #undef ELF_ST_TYPE | |
22 | #undef ELF_R_SYM | |
23 | #undef ELF_R_TYPE | |
24 | ||
1da177e4 LT |
25 | #if KERNEL_ELFCLASS == ELFCLASS32 |
26 | ||
62070fa4 SR |
27 | #define Elf_Ehdr Elf32_Ehdr |
28 | #define Elf_Shdr Elf32_Shdr | |
1da177e4 | 29 | #define Elf_Sym Elf32_Sym |
b39927cf | 30 | #define Elf_Addr Elf32_Addr |
4f4c4ee1 | 31 | #define Elf_Section Elf32_Half |
1da177e4 LT |
32 | #define ELF_ST_BIND ELF32_ST_BIND |
33 | #define ELF_ST_TYPE ELF32_ST_TYPE | |
34 | ||
2c1a51f3 | 35 | #define Elf_Rel Elf32_Rel |
b39927cf SR |
36 | #define Elf_Rela Elf32_Rela |
37 | #define ELF_R_SYM ELF32_R_SYM | |
38 | #define ELF_R_TYPE ELF32_R_TYPE | |
1da177e4 LT |
39 | #else |
40 | ||
62070fa4 SR |
41 | #define Elf_Ehdr Elf64_Ehdr |
42 | #define Elf_Shdr Elf64_Shdr | |
1da177e4 | 43 | #define Elf_Sym Elf64_Sym |
b39927cf | 44 | #define Elf_Addr Elf64_Addr |
4f4c4ee1 | 45 | #define Elf_Section Elf64_Half |
1da177e4 LT |
46 | #define ELF_ST_BIND ELF64_ST_BIND |
47 | #define ELF_ST_TYPE ELF64_ST_TYPE | |
48 | ||
2c1a51f3 | 49 | #define Elf_Rel Elf64_Rel |
b39927cf SR |
50 | #define Elf_Rela Elf64_Rela |
51 | #define ELF_R_SYM ELF64_R_SYM | |
52 | #define ELF_R_TYPE ELF64_R_TYPE | |
1da177e4 LT |
53 | #endif |
54 | ||
bd78c9d7 MY |
55 | #define bswap(x) \ |
56 | ({ \ | |
57 | _Static_assert(sizeof(x) == 1 || sizeof(x) == 2 || \ | |
58 | sizeof(x) == 4 || sizeof(x) == 8, "bug"); \ | |
59 | (typeof(x))(sizeof(x) == 2 ? bswap_16(x) : \ | |
60 | sizeof(x) == 4 ? bswap_32(x) : \ | |
61 | sizeof(x) == 8 ? bswap_64(x) : \ | |
62 | x); \ | |
63 | }) | |
1da177e4 | 64 | |
bd78c9d7 | 65 | #if KERNEL_ELFDATA != HOST_ELFDATA |
1da177e4 | 66 | |
bd78c9d7 | 67 | #define TO_NATIVE(x) (bswap(x)) |
1da177e4 LT |
68 | |
69 | #else /* endianness matches */ | |
70 | ||
71 | #define TO_NATIVE(x) (x) | |
72 | ||
73 | #endif | |
74 | ||
75 | #define NOFAIL(ptr) do_nofail((ptr), #ptr) | |
c5c468dc MY |
76 | |
77 | #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0])) | |
78 | ||
1da177e4 LT |
79 | void *do_nofail(void *ptr, const char *expr); |
80 | ||
81 | struct buffer { | |
82 | char *p; | |
83 | int pos; | |
84 | int size; | |
85 | }; | |
86 | ||
87 | void __attribute__((format(printf, 2, 3))) | |
88 | buf_printf(struct buffer *buf, const char *fmt, ...); | |
89 | ||
90 | void | |
91 | buf_write(struct buffer *buf, const char *s, int len); | |
92 | ||
93 | struct module { | |
325eba05 | 94 | struct list_head list; |
f841536e | 95 | struct list_head exported_symbols; |
8a69152b | 96 | struct list_head unresolved_symbols; |
5066743e | 97 | bool is_gpl_compatible; |
58e01fca MY |
98 | bool from_dump; /* true if module was loaded from *.symvers */ |
99 | bool is_vmlinux; | |
100 | bool seen; | |
101 | bool has_init; | |
102 | bool has_cleanup; | |
1da177e4 LT |
103 | struct buffer dev_table_buf; |
104 | char srcversion[25]; | |
bbc55bde | 105 | // Missing namespace dependencies |
ab489d60 | 106 | struct list_head missing_namespaces; |
cb9b55d2 | 107 | // Actual imported namespaces |
ab489d60 | 108 | struct list_head imported_namespaces; |
a82f794c | 109 | char name[]; |
1da177e4 LT |
110 | }; |
111 | ||
112 | struct elf_info { | |
3b09efc4 | 113 | size_t size; |
1da177e4 LT |
114 | Elf_Ehdr *hdr; |
115 | Elf_Shdr *sechdrs; | |
116 | Elf_Sym *symtab_start; | |
117 | Elf_Sym *symtab_stop; | |
ddb5cdba | 118 | unsigned int export_symbol_secndx; /* .export_symbol section */ |
7d02b490 | 119 | char *strtab; |
1da177e4 LT |
120 | char *modinfo; |
121 | unsigned int modinfo_len; | |
1ce53adf DV |
122 | |
123 | /* support for 32bit section numbers */ | |
124 | ||
125 | unsigned int num_sections; /* max_secindex + 1 */ | |
126 | unsigned int secindex_strings; | |
127 | /* if Nth symbol table entry has .st_shndx = SHN_XINDEX, | |
128 | * take shndx from symtab_shndx_start[N] instead */ | |
129 | Elf32_Word *symtab_shndx_start; | |
130 | Elf32_Word *symtab_shndx_stop; | |
40745327 JB |
131 | |
132 | struct symsearch *symsearch; | |
1da177e4 LT |
133 | }; |
134 | ||
1ce53adf DV |
135 | /* Accessor for sym->st_shndx, hides ugliness of "64k sections" */ |
136 | static inline unsigned int get_secindex(const struct elf_info *info, | |
137 | const Elf_Sym *sym) | |
138 | { | |
36b0f0de MY |
139 | unsigned int index = sym->st_shndx; |
140 | ||
141 | /* | |
142 | * Elf{32,64}_Sym::st_shndx is 2 byte. Big section numbers are available | |
143 | * in the .symtab_shndx section. | |
144 | */ | |
145 | if (index == SHN_XINDEX) | |
146 | return info->symtab_shndx_start[sym - info->symtab_start]; | |
147 | ||
148 | /* | |
149 | * Move reserved section indices SHN_LORESERVE..SHN_HIRESERVE out of | |
150 | * the way to UINT_MAX-255..UINT_MAX, to avoid conflicting with real | |
151 | * section indices. | |
152 | */ | |
153 | if (index >= SHN_LORESERVE && index <= SHN_HIRESERVE) | |
154 | return index - SHN_HIRESERVE - 1; | |
155 | ||
156 | return index; | |
1ce53adf DV |
157 | } |
158 | ||
40745327 JB |
159 | /* |
160 | * If there's no name there, ignore it; likewise, ignore it if it's | |
161 | * one of the magic symbols emitted used by current tools. | |
162 | * | |
163 | * Internal symbols created by tools should be ignored by modpost. | |
164 | */ | |
5c5e048b | 165 | static inline bool is_valid_name(struct elf_info *elf, Elf_Sym *sym) |
40745327 JB |
166 | { |
167 | const char *name = elf->strtab + sym->st_name; | |
168 | ||
169 | if (!name || !strlen(name)) | |
5c5e048b | 170 | return false; |
40745327 JB |
171 | return !is_mapping_symbol(name); |
172 | } | |
173 | ||
174 | /* symsearch.c */ | |
175 | void symsearch_init(struct elf_info *elf); | |
176 | void symsearch_finish(struct elf_info *elf); | |
177 | Elf_Sym *symsearch_find_nearest(struct elf_info *elf, Elf_Addr addr, | |
178 | unsigned int secndx, bool allow_negative, | |
179 | Elf_Addr min_distance); | |
180 | ||
cb80514d | 181 | /* file2alias.c */ |
1da177e4 LT |
182 | void handle_moddevtable(struct module *mod, struct elf_info *info, |
183 | Elf_Sym *sym, const char *symname); | |
1da177e4 LT |
184 | void add_moddevtable(struct buffer *buf, struct module *mod); |
185 | ||
cb80514d | 186 | /* sumversion.c */ |
1da177e4 LT |
187 | void get_src_version(const char *modname, char sum[], unsigned sumlen); |
188 | ||
cb80514d | 189 | /* from modpost.c */ |
ac5100f5 MY |
190 | char *read_text_file(const char *filename); |
191 | char *get_line(char **stringp); | |
abe864b8 | 192 | void *sym_get_data(const struct elf_info *info, const Elf_Sym *sym); |
cb80514d | 193 | |
93c95e52 JY |
194 | enum loglevel { |
195 | LOG_WARN, | |
196 | LOG_ERROR, | |
93c95e52 JY |
197 | }; |
198 | ||
cc87b7c0 MY |
199 | void __attribute__((format(printf, 2, 3))) |
200 | modpost_log(enum loglevel loglevel, const char *fmt, ...); | |
93c95e52 | 201 | |
0fd3fbad MY |
202 | /* |
203 | * warn - show the given message, then let modpost continue running, still | |
204 | * allowing modpost to exit successfully. This should be used when | |
205 | * we still allow to generate vmlinux and modules. | |
206 | * | |
207 | * error - show the given message, then let modpost continue running, but fail | |
208 | * in the end. This should be used when we should stop building vmlinux | |
209 | * or modules, but we can continue running modpost to catch as many | |
210 | * issues as possible. | |
211 | * | |
212 | * fatal - show the given message, and bail out immediately. This should be | |
213 | * used when there is no point to continue running modpost. | |
214 | */ | |
93c95e52 | 215 | #define warn(fmt, args...) modpost_log(LOG_WARN, fmt, ##args) |
bc72d723 | 216 | #define error(fmt, args...) modpost_log(LOG_ERROR, fmt, ##args) |
cda5f94e | 217 | #define fatal(fmt, args...) do { error(fmt, ##args); exit(1); } while (1) |