1 /* SPDX-License-Identifier: GPL-2.0 */
2 #include <stdio.h>
3 #include <stdlib.h>
4 #include <stdarg.h>
5 #include <stdbool.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
14 #include "elfconfig.h"
15
16 /* On BSD-alike OSes elf.h defines these according to host's word size */
17 #undef ELF_ST_BIND
18 #undef ELF_ST_TYPE
19 #undef ELF_R_SYM
20 #undef ELF_R_TYPE
21
22 #if KERNEL_ELFCLASS == ELFCLASS32
23
24 #define Elf_Ehdr Elf32_Ehdr
25 #define Elf_Shdr Elf32_Shdr
26 #define Elf_Sym Elf32_Sym
27 #define Elf_Addr Elf32_Addr
28 #define Elf_Sword Elf64_Sword
29 #define Elf_Section Elf32_Half
30 #define ELF_ST_BIND ELF32_ST_BIND
31 #define ELF_ST_TYPE ELF32_ST_TYPE
32
33 #define Elf_Rel Elf32_Rel
34 #define Elf_Rela Elf32_Rela
35 #define ELF_R_SYM ELF32_R_SYM
36 #define ELF_R_TYPE ELF32_R_TYPE
37 #else
38
39 #define Elf_Ehdr Elf64_Ehdr
40 #define Elf_Shdr Elf64_Shdr
41 #define Elf_Sym Elf64_Sym
42 #define Elf_Addr Elf64_Addr
43 #define Elf_Sword Elf64_Sxword
44 #define Elf_Section Elf64_Half
45 #define ELF_ST_BIND ELF64_ST_BIND
46 #define ELF_ST_TYPE ELF64_ST_TYPE
47
48 #define Elf_Rel Elf64_Rel
49 #define Elf_Rela Elf64_Rela
50 #define ELF_R_SYM ELF64_R_SYM
51 #define ELF_R_TYPE ELF64_R_TYPE
52 #endif
53
54 /* The 64-bit MIPS ELF ABI uses an unusual reloc format. */
55 typedef struct
56 {
57 Elf32_Word r_sym; /* Symbol index */
58 unsigned char r_ssym; /* Special symbol for 2nd relocation */
59 unsigned char r_type3; /* 3rd relocation type */
60 unsigned char r_type2; /* 2nd relocation type */
61 unsigned char r_type1; /* 1st relocation type */
62 } _Elf64_Mips_R_Info;
63
64 typedef union
65 {
66 Elf64_Xword r_info_number;
67 _Elf64_Mips_R_Info r_info_fields;
68 } _Elf64_Mips_R_Info_union;
69
70 #define ELF64_MIPS_R_SYM(i) \
71 ((__extension__ (_Elf64_Mips_R_Info_union)(i)).r_info_fields.r_sym)
72
73 #define ELF64_MIPS_R_TYPE(i) \
74 ((__extension__ (_Elf64_Mips_R_Info_union)(i)).r_info_fields.r_type1)
75
76 #if KERNEL_ELFDATA != HOST_ELFDATA
77
__endian(const void * src,void * dest,unsigned int size)78 static inline void __endian(const void *src, void *dest, unsigned int size)
79 {
80 unsigned int i;
81 for (i = 0; i < size; i++)
82 ((unsigned char*)dest)[i] = ((unsigned char*)src)[size - i-1];
83 }
84
85 #define TO_NATIVE(x) \
86 ({ \
87 typeof(x) __x; \
88 __endian(&(x), &(__x), sizeof(__x)); \
89 __x; \
90 })
91
92 #else /* endianness matches */
93
94 #define TO_NATIVE(x) (x)
95
96 #endif
97
98 #define NOFAIL(ptr) do_nofail((ptr), #ptr)
99 void *do_nofail(void *ptr, const char *expr);
100
101 struct buffer {
102 char *p;
103 int pos;
104 int size;
105 };
106
107 void __attribute__((format(printf, 2, 3)))
108 buf_printf(struct buffer *buf, const char *fmt, ...);
109
110 void
111 buf_write(struct buffer *buf, const char *s, int len);
112
113 struct namespace_list {
114 struct namespace_list *next;
115 char namespace[];
116 };
117
118 struct module {
119 struct module *next;
120 int gpl_compatible;
121 struct symbol *unres;
122 int from_dump; /* 1 if module was loaded from *.symvers */
123 int is_vmlinux;
124 int seen;
125 int has_init;
126 int has_cleanup;
127 struct buffer dev_table_buf;
128 char srcversion[25];
129 // Missing namespace dependencies
130 struct namespace_list *missing_namespaces;
131 // Actual imported namespaces
132 struct namespace_list *imported_namespaces;
133 char name[];
134 };
135
136 struct elf_info {
137 size_t size;
138 Elf_Ehdr *hdr;
139 Elf_Shdr *sechdrs;
140 Elf_Sym *symtab_start;
141 Elf_Sym *symtab_stop;
142 Elf_Section export_sec;
143 Elf_Section export_unused_sec;
144 Elf_Section export_gpl_sec;
145 Elf_Section export_unused_gpl_sec;
146 Elf_Section export_gpl_future_sec;
147 char *strtab;
148 char *modinfo;
149 unsigned int modinfo_len;
150
151 /* support for 32bit section numbers */
152
153 unsigned int num_sections; /* max_secindex + 1 */
154 unsigned int secindex_strings;
155 /* if Nth symbol table entry has .st_shndx = SHN_XINDEX,
156 * take shndx from symtab_shndx_start[N] instead */
157 Elf32_Word *symtab_shndx_start;
158 Elf32_Word *symtab_shndx_stop;
159 };
160
is_shndx_special(unsigned int i)161 static inline int is_shndx_special(unsigned int i)
162 {
163 return i != SHN_XINDEX && i >= SHN_LORESERVE && i <= SHN_HIRESERVE;
164 }
165
166 /*
167 * Move reserved section indices SHN_LORESERVE..SHN_HIRESERVE out of
168 * the way to -256..-1, to avoid conflicting with real section
169 * indices.
170 */
171 #define SPECIAL(i) ((i) - (SHN_HIRESERVE + 1))
172
173 /* Accessor for sym->st_shndx, hides ugliness of "64k sections" */
get_secindex(const struct elf_info * info,const Elf_Sym * sym)174 static inline unsigned int get_secindex(const struct elf_info *info,
175 const Elf_Sym *sym)
176 {
177 if (is_shndx_special(sym->st_shndx))
178 return SPECIAL(sym->st_shndx);
179 if (sym->st_shndx != SHN_XINDEX)
180 return sym->st_shndx;
181 return info->symtab_shndx_start[sym - info->symtab_start];
182 }
183
strends(const char * str,const char * postfix)184 static inline bool strends(const char *str, const char *postfix)
185 {
186 if (strlen(str) < strlen(postfix))
187 return false;
188
189 return strcmp(str + strlen(str) - strlen(postfix), postfix) == 0;
190 }
191
192 /* file2alias.c */
193 extern unsigned int cross_build;
194 void handle_moddevtable(struct module *mod, struct elf_info *info,
195 Elf_Sym *sym, const char *symname);
196 void add_moddevtable(struct buffer *buf, struct module *mod);
197
198 /* sumversion.c */
199 void get_src_version(const char *modname, char sum[], unsigned sumlen);
200
201 /* from modpost.c */
202 char *read_text_file(const char *filename);
203 char *get_line(char **stringp);
204
205 enum loglevel {
206 LOG_WARN,
207 LOG_ERROR,
208 LOG_FATAL
209 };
210
211 void modpost_log(enum loglevel loglevel, const char *fmt, ...);
212
213 /*
214 * warn - show the given message, then let modpost continue running, still
215 * allowing modpost to exit successfully. This should be used when
216 * we still allow to generate vmlinux and modules.
217 *
218 * error - show the given message, then let modpost continue running, but fail
219 * in the end. This should be used when we should stop building vmlinux
220 * or modules, but we can continue running modpost to catch as many
221 * issues as possible.
222 *
223 * fatal - show the given message, and bail out immediately. This should be
224 * used when there is no point to continue running modpost.
225 */
226 #define warn(fmt, args...) modpost_log(LOG_WARN, fmt, ##args)
227 #define error(fmt, args...) modpost_log(LOG_ERROR, fmt, ##args)
228 #define fatal(fmt, args...) modpost_log(LOG_FATAL, fmt, ##args)
229