1 #include <stdio.h> 2 #include <stdlib.h> 3 #include <stdarg.h> 4 #include <string.h> 5 #include <sys/types.h> 6 #include <sys/stat.h> 7 #include <sys/mman.h> 8 #include <fcntl.h> 9 #include <unistd.h> 10 #include <elf.h> 11 12 #include "elfconfig.h" 13 14 /* On BSD-alike OSes elf.h defines these according to host's word size */ 15 #undef ELF_ST_BIND 16 #undef ELF_ST_TYPE 17 #undef ELF_R_SYM 18 #undef ELF_R_TYPE 19 20 #if KERNEL_ELFCLASS == ELFCLASS32 21 22 #define Elf_Ehdr Elf32_Ehdr 23 #define Elf_Shdr Elf32_Shdr 24 #define Elf_Sym Elf32_Sym 25 #define Elf_Addr Elf32_Addr 26 #define Elf_Sword Elf64_Sword 27 #define Elf_Section Elf32_Half 28 #define ELF_ST_BIND ELF32_ST_BIND 29 #define ELF_ST_TYPE ELF32_ST_TYPE 30 31 #define Elf_Rel Elf32_Rel 32 #define Elf_Rela Elf32_Rela 33 #define ELF_R_SYM ELF32_R_SYM 34 #define ELF_R_TYPE ELF32_R_TYPE 35 #else 36 37 #define Elf_Ehdr Elf64_Ehdr 38 #define Elf_Shdr Elf64_Shdr 39 #define Elf_Sym Elf64_Sym 40 #define Elf_Addr Elf64_Addr 41 #define Elf_Sword Elf64_Sxword 42 #define Elf_Section Elf64_Half 43 #define ELF_ST_BIND ELF64_ST_BIND 44 #define ELF_ST_TYPE ELF64_ST_TYPE 45 46 #define Elf_Rel Elf64_Rel 47 #define Elf_Rela Elf64_Rela 48 #define ELF_R_SYM ELF64_R_SYM 49 #define ELF_R_TYPE ELF64_R_TYPE 50 #endif 51 52 /* The 64-bit MIPS ELF ABI uses an unusual reloc format. */ 53 typedef struct 54 { 55 Elf32_Word r_sym; /* Symbol index */ 56 unsigned char r_ssym; /* Special symbol for 2nd relocation */ 57 unsigned char r_type3; /* 3rd relocation type */ 58 unsigned char r_type2; /* 2nd relocation type */ 59 unsigned char r_type1; /* 1st relocation type */ 60 } _Elf64_Mips_R_Info; 61 62 typedef union 63 { 64 Elf64_Xword r_info_number; 65 _Elf64_Mips_R_Info r_info_fields; 66 } _Elf64_Mips_R_Info_union; 67 68 #define ELF64_MIPS_R_SYM(i) \ 69 ((__extension__ (_Elf64_Mips_R_Info_union)(i)).r_info_fields.r_sym) 70 71 #define ELF64_MIPS_R_TYPE(i) \ 72 ((__extension__ (_Elf64_Mips_R_Info_union)(i)).r_info_fields.r_type1) 73 74 #if KERNEL_ELFDATA != HOST_ELFDATA 75 76 static inline void __endian(const void *src, void *dest, unsigned int size) 77 { 78 unsigned int i; 79 for (i = 0; i < size; i++) 80 ((unsigned char*)dest)[i] = ((unsigned char*)src)[size - i-1]; 81 } 82 83 #define TO_NATIVE(x) \ 84 ({ \ 85 typeof(x) __x; \ 86 __endian(&(x), &(__x), sizeof(__x)); \ 87 __x; \ 88 }) 89 90 #else /* endianness matches */ 91 92 #define TO_NATIVE(x) (x) 93 94 #endif 95 96 #define NOFAIL(ptr) do_nofail((ptr), #ptr) 97 void *do_nofail(void *ptr, const char *expr); 98 99 struct buffer { 100 char *p; 101 int pos; 102 int size; 103 }; 104 105 void __attribute__((format(printf, 2, 3))) 106 buf_printf(struct buffer *buf, const char *fmt, ...); 107 108 void 109 buf_write(struct buffer *buf, const char *s, int len); 110 111 struct module { 112 struct module *next; 113 const char *name; 114 int gpl_compatible; 115 struct symbol *unres; 116 int seen; 117 int skip; 118 int has_init; 119 int has_cleanup; 120 struct buffer dev_table_buf; 121 char srcversion[25]; 122 int is_dot_o; 123 }; 124 125 struct elf_info { 126 unsigned long size; 127 Elf_Ehdr *hdr; 128 Elf_Shdr *sechdrs; 129 Elf_Sym *symtab_start; 130 Elf_Sym *symtab_stop; 131 Elf_Section export_sec; 132 Elf_Section export_unused_sec; 133 Elf_Section export_gpl_sec; 134 Elf_Section export_unused_gpl_sec; 135 Elf_Section export_gpl_future_sec; 136 char *strtab; 137 char *modinfo; 138 unsigned int modinfo_len; 139 140 /* support for 32bit section numbers */ 141 142 unsigned int num_sections; /* max_secindex + 1 */ 143 unsigned int secindex_strings; 144 /* if Nth symbol table entry has .st_shndx = SHN_XINDEX, 145 * take shndx from symtab_shndx_start[N] instead */ 146 Elf32_Word *symtab_shndx_start; 147 Elf32_Word *symtab_shndx_stop; 148 }; 149 150 static inline int is_shndx_special(unsigned int i) 151 { 152 return i != SHN_XINDEX && i >= SHN_LORESERVE && i <= SHN_HIRESERVE; 153 } 154 155 /* 156 * Move reserved section indices SHN_LORESERVE..SHN_HIRESERVE out of 157 * the way to -256..-1, to avoid conflicting with real section 158 * indices. 159 */ 160 #define SPECIAL(i) ((i) - (SHN_HIRESERVE + 1)) 161 162 /* Accessor for sym->st_shndx, hides ugliness of "64k sections" */ 163 static inline unsigned int get_secindex(const struct elf_info *info, 164 const Elf_Sym *sym) 165 { 166 if (is_shndx_special(sym->st_shndx)) 167 return SPECIAL(sym->st_shndx); 168 if (sym->st_shndx != SHN_XINDEX) 169 return sym->st_shndx; 170 return info->symtab_shndx_start[sym - info->symtab_start]; 171 } 172 173 /* file2alias.c */ 174 extern unsigned int cross_build; 175 void handle_moddevtable(struct module *mod, struct elf_info *info, 176 Elf_Sym *sym, const char *symname); 177 void add_moddevtable(struct buffer *buf, struct module *mod); 178 179 /* sumversion.c */ 180 void maybe_frob_rcs_version(const char *modfilename, 181 char *version, 182 void *modinfo, 183 unsigned long modinfo_offset); 184 void get_src_version(const char *modname, char sum[], unsigned sumlen); 185 186 /* from modpost.c */ 187 void *grab_file(const char *filename, unsigned long *size); 188 char* get_next_line(unsigned long *pos, void *file, unsigned long size); 189 void release_file(void *file, unsigned long size); 190 191 void fatal(const char *fmt, ...); 192 void warn(const char *fmt, ...); 193 void merror(const char *fmt, ...); 194