1 /* SPDX-License-Identifier: GPL-2.0 */
14 #include "elfconfig.h"
16 /* On BSD-alike OSes elf.h defines these according to host's word size */
22 #if KERNEL_ELFCLASS == ELFCLASS32
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
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
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
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
54 /* The 64-bit MIPS ELF ABI uses an unusual reloc format. */
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 */
66 Elf64_Xword r_info_number;
67 _Elf64_Mips_R_Info r_info_fields;
68 } _Elf64_Mips_R_Info_union;
70 #define ELF64_MIPS_R_SYM(i) \
71 ((__extension__ (_Elf64_Mips_R_Info_union)(i)).r_info_fields.r_sym)
73 #define ELF64_MIPS_R_TYPE(i) \
74 ((__extension__ (_Elf64_Mips_R_Info_union)(i)).r_info_fields.r_type1)
76 #if KERNEL_ELFDATA != HOST_ELFDATA
78 static inline void __endian(const void *src, void *dest, unsigned int size)
81 for (i = 0; i < size; i++)
82 ((unsigned char*)dest)[i] = ((unsigned char*)src)[size - i-1];
85 #define TO_NATIVE(x) \
88 __endian(&(x), &(__x), sizeof(__x)); \
92 #else /* endianness matches */
94 #define TO_NATIVE(x) (x)
98 #define NOFAIL(ptr) do_nofail((ptr), #ptr)
99 void *do_nofail(void *ptr, const char *expr);
107 void __attribute__((format(printf, 2, 3)))
108 buf_printf(struct buffer *buf, const char *fmt, ...);
111 buf_write(struct buffer *buf, const char *s, int len);
113 struct namespace_list {
114 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;
129 // Missing namespace dependencies
130 struct namespace_list *missing_namespaces;
131 // Actual imported namespaces
132 struct namespace_list *imported_namespaces;
140 Elf_Sym *symtab_start;
141 Elf_Sym *symtab_stop;
142 Elf_Section export_sec;
143 Elf_Section export_gpl_sec;
146 unsigned int modinfo_len;
148 /* support for 32bit section numbers */
150 unsigned int num_sections; /* max_secindex + 1 */
151 unsigned int secindex_strings;
152 /* if Nth symbol table entry has .st_shndx = SHN_XINDEX,
153 * take shndx from symtab_shndx_start[N] instead */
154 Elf32_Word *symtab_shndx_start;
155 Elf32_Word *symtab_shndx_stop;
158 static inline int is_shndx_special(unsigned int i)
160 return i != SHN_XINDEX && i >= SHN_LORESERVE && i <= SHN_HIRESERVE;
164 * Move reserved section indices SHN_LORESERVE..SHN_HIRESERVE out of
165 * the way to -256..-1, to avoid conflicting with real section
168 #define SPECIAL(i) ((i) - (SHN_HIRESERVE + 1))
170 /* Accessor for sym->st_shndx, hides ugliness of "64k sections" */
171 static inline unsigned int get_secindex(const struct elf_info *info,
174 if (is_shndx_special(sym->st_shndx))
175 return SPECIAL(sym->st_shndx);
176 if (sym->st_shndx != SHN_XINDEX)
177 return sym->st_shndx;
178 return info->symtab_shndx_start[sym - info->symtab_start];
181 static inline bool strends(const char *str, const char *postfix)
183 if (strlen(str) < strlen(postfix))
186 return strcmp(str + strlen(str) - strlen(postfix), postfix) == 0;
190 extern unsigned int cross_build;
191 void handle_moddevtable(struct module *mod, struct elf_info *info,
192 Elf_Sym *sym, const char *symname);
193 void add_moddevtable(struct buffer *buf, struct module *mod);
196 void get_src_version(const char *modname, char sum[], unsigned sumlen);
199 char *read_text_file(const char *filename);
200 char *get_line(char **stringp);
208 void modpost_log(enum loglevel loglevel, const char *fmt, ...);
211 * warn - show the given message, then let modpost continue running, still
212 * allowing modpost to exit successfully. This should be used when
213 * we still allow to generate vmlinux and modules.
215 * error - show the given message, then let modpost continue running, but fail
216 * in the end. This should be used when we should stop building vmlinux
217 * or modules, but we can continue running modpost to catch as many
218 * issues as possible.
220 * fatal - show the given message, and bail out immediately. This should be
221 * used when there is no point to continue running modpost.
223 #define warn(fmt, args...) modpost_log(LOG_WARN, fmt, ##args)
224 #define error(fmt, args...) modpost_log(LOG_ERROR, fmt, ##args)
225 #define fatal(fmt, args...) modpost_log(LOG_FATAL, fmt, ##args)