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 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_gpl_sec; 144 char *strtab; 145 char *modinfo; 146 unsigned int modinfo_len; 147 148 /* support for 32bit section numbers */ 149 150 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; 156 }; 157 158 static inline int is_shndx_special(unsigned int i) 159 { 160 return i != SHN_XINDEX && i >= SHN_LORESERVE && i <= SHN_HIRESERVE; 161 } 162 163 /* 164 * Move reserved section indices SHN_LORESERVE..SHN_HIRESERVE out of 165 * the way to -256..-1, to avoid conflicting with real section 166 * indices. 167 */ 168 #define SPECIAL(i) ((i) - (SHN_HIRESERVE + 1)) 169 170 /* Accessor for sym->st_shndx, hides ugliness of "64k sections" */ 171 static inline unsigned int get_secindex(const struct elf_info *info, 172 const Elf_Sym *sym) 173 { 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]; 179 } 180 181 static inline bool strends(const char *str, const char *postfix) 182 { 183 if (strlen(str) < strlen(postfix)) 184 return false; 185 186 return strcmp(str + strlen(str) - strlen(postfix), postfix) == 0; 187 } 188 189 /* file2alias.c */ 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); 194 195 /* sumversion.c */ 196 void get_src_version(const char *modname, char sum[], unsigned sumlen); 197 198 /* from modpost.c */ 199 char *read_text_file(const char *filename); 200 char *get_line(char **stringp); 201 202 enum loglevel { 203 LOG_WARN, 204 LOG_ERROR, 205 LOG_FATAL 206 }; 207 208 void modpost_log(enum loglevel loglevel, const char *fmt, ...); 209 210 /* 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. 214 * 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. 219 * 220 * fatal - show the given message, and bail out immediately. This should be 221 * used when there is no point to continue running modpost. 222 */ 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) 226