1 /* SPDX-License-Identifier: GPL-2.0 */
13 #include "elfconfig.h"
15 /* On BSD-alike OSes elf.h defines these according to host's word size */
21 #if KERNEL_ELFCLASS == ELFCLASS32
23 #define Elf_Ehdr Elf32_Ehdr
24 #define Elf_Shdr Elf32_Shdr
25 #define Elf_Sym Elf32_Sym
26 #define Elf_Addr Elf32_Addr
27 #define Elf_Sword Elf64_Sword
28 #define Elf_Section Elf32_Half
29 #define ELF_ST_BIND ELF32_ST_BIND
30 #define ELF_ST_TYPE ELF32_ST_TYPE
32 #define Elf_Rel Elf32_Rel
33 #define Elf_Rela Elf32_Rela
34 #define ELF_R_SYM ELF32_R_SYM
35 #define ELF_R_TYPE ELF32_R_TYPE
38 #define Elf_Ehdr Elf64_Ehdr
39 #define Elf_Shdr Elf64_Shdr
40 #define Elf_Sym Elf64_Sym
41 #define Elf_Addr Elf64_Addr
42 #define Elf_Sword Elf64_Sxword
43 #define Elf_Section Elf64_Half
44 #define ELF_ST_BIND ELF64_ST_BIND
45 #define ELF_ST_TYPE ELF64_ST_TYPE
47 #define Elf_Rel Elf64_Rel
48 #define Elf_Rela Elf64_Rela
49 #define ELF_R_SYM ELF64_R_SYM
50 #define ELF_R_TYPE ELF64_R_TYPE
53 /* The 64-bit MIPS ELF ABI uses an unusual reloc format. */
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 */
65 Elf64_Xword r_info_number;
66 _Elf64_Mips_R_Info r_info_fields;
67 } _Elf64_Mips_R_Info_union;
69 #define ELF64_MIPS_R_SYM(i) \
70 ((__extension__ (_Elf64_Mips_R_Info_union)(i)).r_info_fields.r_sym)
72 #define ELF64_MIPS_R_TYPE(i) \
73 ((__extension__ (_Elf64_Mips_R_Info_union)(i)).r_info_fields.r_type1)
75 #if KERNEL_ELFDATA != HOST_ELFDATA
77 static inline void __endian(const void *src, void *dest, unsigned int size)
80 for (i = 0; i < size; i++)
81 ((unsigned char*)dest)[i] = ((unsigned char*)src)[size - i-1];
84 #define TO_NATIVE(x) \
87 __endian(&(x), &(__x), sizeof(__x)); \
91 #else /* endianness matches */
93 #define TO_NATIVE(x) (x)
97 #define NOFAIL(ptr) do_nofail((ptr), #ptr)
98 void *do_nofail(void *ptr, const char *expr);
106 void __attribute__((format(printf, 2, 3)))
107 buf_printf(struct buffer *buf, const char *fmt, ...);
110 buf_write(struct buffer *buf, const char *s, int len);
112 struct namespace_list {
113 struct namespace_list *next;
121 struct symbol *unres;
122 int from_dump; /* 1 if module was loaded from *.symvers */
127 struct buffer dev_table_buf;
130 // Missing namespace dependencies
131 struct namespace_list *missing_namespaces;
132 // Actual imported namespaces
133 struct namespace_list *imported_namespaces;
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;
149 unsigned int modinfo_len;
151 /* support for 32bit section numbers */
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;
161 static inline int is_shndx_special(unsigned int i)
163 return i != SHN_XINDEX && i >= SHN_LORESERVE && i <= SHN_HIRESERVE;
167 * Move reserved section indices SHN_LORESERVE..SHN_HIRESERVE out of
168 * the way to -256..-1, to avoid conflicting with real section
171 #define SPECIAL(i) ((i) - (SHN_HIRESERVE + 1))
173 /* Accessor for sym->st_shndx, hides ugliness of "64k sections" */
174 static inline unsigned int get_secindex(const struct elf_info *info,
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];
185 extern unsigned int cross_build;
186 void handle_moddevtable(struct module *mod, struct elf_info *info,
187 Elf_Sym *sym, const char *symname);
188 void add_moddevtable(struct buffer *buf, struct module *mod);
191 void get_src_version(const char *modname, char sum[], unsigned sumlen);
194 char *read_text_file(const char *filename);
195 char *get_line(char **stringp);
196 void *grab_file(const char *filename, unsigned long *size);
197 char* get_next_line(unsigned long *pos, void *file, unsigned long size);
198 void release_file(void *file, unsigned long size);
206 void modpost_log(enum loglevel loglevel, const char *fmt, ...);
208 #define warn(fmt, args...) modpost_log(LOG_WARN, fmt, ##args)
209 #define merror(fmt, args...) modpost_log(LOG_ERROR, fmt, ##args)
210 #define fatal(fmt, args...) modpost_log(LOG_FATAL, fmt, ##args)