Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
58e01fca | 2 | #include <stdbool.h> |
1da177e4 LT |
3 | #include <stdio.h> |
4 | #include <stdlib.h> | |
5 | #include <stdarg.h> | |
6 | #include <string.h> | |
7 | #include <sys/types.h> | |
8 | #include <sys/stat.h> | |
9 | #include <sys/mman.h> | |
10 | #include <fcntl.h> | |
11 | #include <unistd.h> | |
12 | #include <elf.h> | |
13 | ||
325eba05 | 14 | #include "list.h" |
1da177e4 LT |
15 | #include "elfconfig.h" |
16 | ||
3c0561e0 PF |
17 | /* On BSD-alike OSes elf.h defines these according to host's word size */ |
18 | #undef ELF_ST_BIND | |
19 | #undef ELF_ST_TYPE | |
20 | #undef ELF_R_SYM | |
21 | #undef ELF_R_TYPE | |
22 | ||
1da177e4 LT |
23 | #if KERNEL_ELFCLASS == ELFCLASS32 |
24 | ||
62070fa4 SR |
25 | #define Elf_Ehdr Elf32_Ehdr |
26 | #define Elf_Shdr Elf32_Shdr | |
1da177e4 | 27 | #define Elf_Sym Elf32_Sym |
b39927cf | 28 | #define Elf_Addr Elf32_Addr |
4f4c4ee1 | 29 | #define Elf_Section Elf32_Half |
1da177e4 LT |
30 | #define ELF_ST_BIND ELF32_ST_BIND |
31 | #define ELF_ST_TYPE ELF32_ST_TYPE | |
32 | ||
2c1a51f3 | 33 | #define Elf_Rel Elf32_Rel |
b39927cf SR |
34 | #define Elf_Rela Elf32_Rela |
35 | #define ELF_R_SYM ELF32_R_SYM | |
36 | #define ELF_R_TYPE ELF32_R_TYPE | |
1da177e4 LT |
37 | #else |
38 | ||
62070fa4 SR |
39 | #define Elf_Ehdr Elf64_Ehdr |
40 | #define Elf_Shdr Elf64_Shdr | |
1da177e4 | 41 | #define Elf_Sym Elf64_Sym |
b39927cf | 42 | #define Elf_Addr Elf64_Addr |
4f4c4ee1 | 43 | #define Elf_Section Elf64_Half |
1da177e4 LT |
44 | #define ELF_ST_BIND ELF64_ST_BIND |
45 | #define ELF_ST_TYPE ELF64_ST_TYPE | |
46 | ||
2c1a51f3 | 47 | #define Elf_Rel Elf64_Rel |
b39927cf SR |
48 | #define Elf_Rela Elf64_Rela |
49 | #define ELF_R_SYM ELF64_R_SYM | |
50 | #define ELF_R_TYPE ELF64_R_TYPE | |
1da177e4 LT |
51 | #endif |
52 | ||
eae07ac6 AN |
53 | /* The 64-bit MIPS ELF ABI uses an unusual reloc format. */ |
54 | typedef struct | |
55 | { | |
56 | Elf32_Word r_sym; /* Symbol index */ | |
57 | unsigned char r_ssym; /* Special symbol for 2nd relocation */ | |
58 | unsigned char r_type3; /* 3rd relocation type */ | |
59 | unsigned char r_type2; /* 2nd relocation type */ | |
60 | unsigned char r_type1; /* 1st relocation type */ | |
61 | } _Elf64_Mips_R_Info; | |
62 | ||
63 | typedef union | |
64 | { | |
65 | Elf64_Xword r_info_number; | |
66 | _Elf64_Mips_R_Info r_info_fields; | |
67 | } _Elf64_Mips_R_Info_union; | |
68 | ||
69 | #define ELF64_MIPS_R_SYM(i) \ | |
70 | ((__extension__ (_Elf64_Mips_R_Info_union)(i)).r_info_fields.r_sym) | |
71 | ||
ae4ac123 AN |
72 | #define ELF64_MIPS_R_TYPE(i) \ |
73 | ((__extension__ (_Elf64_Mips_R_Info_union)(i)).r_info_fields.r_type1) | |
74 | ||
1da177e4 LT |
75 | #if KERNEL_ELFDATA != HOST_ELFDATA |
76 | ||
77 | static inline void __endian(const void *src, void *dest, unsigned int size) | |
78 | { | |
79 | unsigned int i; | |
80 | for (i = 0; i < size; i++) | |
81 | ((unsigned char*)dest)[i] = ((unsigned char*)src)[size - i-1]; | |
82 | } | |
83 | ||
1da177e4 LT |
84 | #define TO_NATIVE(x) \ |
85 | ({ \ | |
86 | typeof(x) __x; \ | |
87 | __endian(&(x), &(__x), sizeof(__x)); \ | |
88 | __x; \ | |
89 | }) | |
90 | ||
91 | #else /* endianness matches */ | |
92 | ||
93 | #define TO_NATIVE(x) (x) | |
94 | ||
95 | #endif | |
96 | ||
97 | #define NOFAIL(ptr) do_nofail((ptr), #ptr) | |
c5c468dc MY |
98 | |
99 | #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0])) | |
100 | ||
1da177e4 LT |
101 | void *do_nofail(void *ptr, const char *expr); |
102 | ||
103 | struct buffer { | |
104 | char *p; | |
105 | int pos; | |
106 | int size; | |
107 | }; | |
108 | ||
109 | void __attribute__((format(printf, 2, 3))) | |
110 | buf_printf(struct buffer *buf, const char *fmt, ...); | |
111 | ||
112 | void | |
113 | buf_write(struct buffer *buf, const char *s, int len); | |
114 | ||
115 | struct module { | |
325eba05 | 116 | struct list_head list; |
f841536e | 117 | struct list_head exported_symbols; |
8a69152b | 118 | struct list_head unresolved_symbols; |
5066743e | 119 | bool is_gpl_compatible; |
58e01fca MY |
120 | bool from_dump; /* true if module was loaded from *.symvers */ |
121 | bool is_vmlinux; | |
122 | bool seen; | |
123 | bool has_init; | |
124 | bool has_cleanup; | |
1da177e4 LT |
125 | struct buffer dev_table_buf; |
126 | char srcversion[25]; | |
bbc55bde | 127 | // Missing namespace dependencies |
ab489d60 | 128 | struct list_head missing_namespaces; |
cb9b55d2 | 129 | // Actual imported namespaces |
ab489d60 | 130 | struct list_head imported_namespaces; |
a82f794c | 131 | char name[]; |
1da177e4 LT |
132 | }; |
133 | ||
134 | struct elf_info { | |
3b09efc4 | 135 | size_t size; |
1da177e4 LT |
136 | Elf_Ehdr *hdr; |
137 | Elf_Shdr *sechdrs; | |
138 | Elf_Sym *symtab_start; | |
139 | Elf_Sym *symtab_stop; | |
7d02b490 | 140 | char *strtab; |
1da177e4 LT |
141 | char *modinfo; |
142 | unsigned int modinfo_len; | |
1ce53adf DV |
143 | |
144 | /* support for 32bit section numbers */ | |
145 | ||
146 | unsigned int num_sections; /* max_secindex + 1 */ | |
147 | unsigned int secindex_strings; | |
148 | /* if Nth symbol table entry has .st_shndx = SHN_XINDEX, | |
149 | * take shndx from symtab_shndx_start[N] instead */ | |
150 | Elf32_Word *symtab_shndx_start; | |
151 | Elf32_Word *symtab_shndx_stop; | |
1da177e4 LT |
152 | }; |
153 | ||
1ce53adf DV |
154 | static inline int is_shndx_special(unsigned int i) |
155 | { | |
156 | return i != SHN_XINDEX && i >= SHN_LORESERVE && i <= SHN_HIRESERVE; | |
157 | } | |
158 | ||
1ce53adf DV |
159 | /* Accessor for sym->st_shndx, hides ugliness of "64k sections" */ |
160 | static inline unsigned int get_secindex(const struct elf_info *info, | |
161 | const Elf_Sym *sym) | |
162 | { | |
36b0f0de MY |
163 | unsigned int index = sym->st_shndx; |
164 | ||
165 | /* | |
166 | * Elf{32,64}_Sym::st_shndx is 2 byte. Big section numbers are available | |
167 | * in the .symtab_shndx section. | |
168 | */ | |
169 | if (index == SHN_XINDEX) | |
170 | return info->symtab_shndx_start[sym - info->symtab_start]; | |
171 | ||
172 | /* | |
173 | * Move reserved section indices SHN_LORESERVE..SHN_HIRESERVE out of | |
174 | * the way to UINT_MAX-255..UINT_MAX, to avoid conflicting with real | |
175 | * section indices. | |
176 | */ | |
177 | if (index >= SHN_LORESERVE && index <= SHN_HIRESERVE) | |
178 | return index - SHN_HIRESERVE - 1; | |
179 | ||
180 | return index; | |
1ce53adf DV |
181 | } |
182 | ||
cb80514d | 183 | /* file2alias.c */ |
1da177e4 LT |
184 | void handle_moddevtable(struct module *mod, struct elf_info *info, |
185 | Elf_Sym *sym, const char *symname); | |
1da177e4 LT |
186 | void add_moddevtable(struct buffer *buf, struct module *mod); |
187 | ||
cb80514d | 188 | /* sumversion.c */ |
1da177e4 LT |
189 | void get_src_version(const char *modname, char sum[], unsigned sumlen); |
190 | ||
cb80514d | 191 | /* from modpost.c */ |
ac5100f5 MY |
192 | char *read_text_file(const char *filename); |
193 | char *get_line(char **stringp); | |
abe864b8 | 194 | void *sym_get_data(const struct elf_info *info, const Elf_Sym *sym); |
cb80514d | 195 | |
93c95e52 JY |
196 | enum loglevel { |
197 | LOG_WARN, | |
198 | LOG_ERROR, | |
199 | LOG_FATAL | |
200 | }; | |
201 | ||
202 | void modpost_log(enum loglevel loglevel, const char *fmt, ...); | |
203 | ||
0fd3fbad MY |
204 | /* |
205 | * warn - show the given message, then let modpost continue running, still | |
206 | * allowing modpost to exit successfully. This should be used when | |
207 | * we still allow to generate vmlinux and modules. | |
208 | * | |
209 | * error - show the given message, then let modpost continue running, but fail | |
210 | * in the end. This should be used when we should stop building vmlinux | |
211 | * or modules, but we can continue running modpost to catch as many | |
212 | * issues as possible. | |
213 | * | |
214 | * fatal - show the given message, and bail out immediately. This should be | |
215 | * used when there is no point to continue running modpost. | |
216 | */ | |
93c95e52 | 217 | #define warn(fmt, args...) modpost_log(LOG_WARN, fmt, ##args) |
bc72d723 | 218 | #define error(fmt, args...) modpost_log(LOG_ERROR, fmt, ##args) |
93c95e52 | 219 | #define fatal(fmt, args...) modpost_log(LOG_FATAL, fmt, ##args) |