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 #if KERNEL_ELFCLASS == ELFCLASS32 15 16 #define Elf_Ehdr Elf32_Ehdr 17 #define Elf_Shdr Elf32_Shdr 18 #define Elf_Sym Elf32_Sym 19 #define Elf_Addr Elf32_Addr 20 #define Elf_Sword Elf64_Sword 21 #define Elf_Section Elf32_Half 22 #define ELF_ST_BIND ELF32_ST_BIND 23 #define ELF_ST_TYPE ELF32_ST_TYPE 24 25 #define Elf_Rel Elf32_Rel 26 #define Elf_Rela Elf32_Rela 27 #define ELF_R_SYM ELF32_R_SYM 28 #define ELF_R_TYPE ELF32_R_TYPE 29 #else 30 31 #define Elf_Ehdr Elf64_Ehdr 32 #define Elf_Shdr Elf64_Shdr 33 #define Elf_Sym Elf64_Sym 34 #define Elf_Addr Elf64_Addr 35 #define Elf_Sword Elf64_Sxword 36 #define Elf_Section Elf64_Half 37 #define ELF_ST_BIND ELF64_ST_BIND 38 #define ELF_ST_TYPE ELF64_ST_TYPE 39 40 #define Elf_Rel Elf64_Rel 41 #define Elf_Rela Elf64_Rela 42 #define ELF_R_SYM ELF64_R_SYM 43 #define ELF_R_TYPE ELF64_R_TYPE 44 #endif 45 46 /* The 64-bit MIPS ELF ABI uses an unusual reloc format. */ 47 typedef struct 48 { 49 Elf32_Word r_sym; /* Symbol index */ 50 unsigned char r_ssym; /* Special symbol for 2nd relocation */ 51 unsigned char r_type3; /* 3rd relocation type */ 52 unsigned char r_type2; /* 2nd relocation type */ 53 unsigned char r_type1; /* 1st relocation type */ 54 } _Elf64_Mips_R_Info; 55 56 typedef union 57 { 58 Elf64_Xword r_info_number; 59 _Elf64_Mips_R_Info r_info_fields; 60 } _Elf64_Mips_R_Info_union; 61 62 #define ELF64_MIPS_R_SYM(i) \ 63 ((__extension__ (_Elf64_Mips_R_Info_union)(i)).r_info_fields.r_sym) 64 65 #define ELF64_MIPS_R_TYPE(i) \ 66 ((__extension__ (_Elf64_Mips_R_Info_union)(i)).r_info_fields.r_type1) 67 68 #if KERNEL_ELFDATA != HOST_ELFDATA 69 70 static inline void __endian(const void *src, void *dest, unsigned int size) 71 { 72 unsigned int i; 73 for (i = 0; i < size; i++) 74 ((unsigned char*)dest)[i] = ((unsigned char*)src)[size - i-1]; 75 } 76 77 #define TO_NATIVE(x) \ 78 ({ \ 79 typeof(x) __x; \ 80 __endian(&(x), &(__x), sizeof(__x)); \ 81 __x; \ 82 }) 83 84 #else /* endianness matches */ 85 86 #define TO_NATIVE(x) (x) 87 88 #endif 89 90 #define NOFAIL(ptr) do_nofail((ptr), #ptr) 91 void *do_nofail(void *ptr, const char *expr); 92 93 struct buffer { 94 char *p; 95 int pos; 96 int size; 97 }; 98 99 void __attribute__((format(printf, 2, 3))) 100 buf_printf(struct buffer *buf, const char *fmt, ...); 101 102 void 103 buf_write(struct buffer *buf, const char *s, int len); 104 105 struct module { 106 struct module *next; 107 const char *name; 108 int gpl_compatible; 109 struct symbol *unres; 110 int seen; 111 int skip; 112 int has_init; 113 int has_cleanup; 114 struct buffer dev_table_buf; 115 char srcversion[25]; 116 }; 117 118 struct elf_info { 119 unsigned long size; 120 Elf_Ehdr *hdr; 121 Elf_Shdr *sechdrs; 122 Elf_Sym *symtab_start; 123 Elf_Sym *symtab_stop; 124 Elf_Section export_sec; 125 Elf_Section export_unused_sec; 126 Elf_Section export_gpl_sec; 127 Elf_Section export_unused_gpl_sec; 128 Elf_Section export_gpl_future_sec; 129 const char *strtab; 130 char *modinfo; 131 unsigned int modinfo_len; 132 133 /* support for 32bit section numbers */ 134 135 unsigned int num_sections; /* max_secindex + 1 */ 136 unsigned int secindex_strings; 137 /* if Nth symbol table entry has .st_shndx = SHN_XINDEX, 138 * take shndx from symtab_shndx_start[N] instead */ 139 Elf32_Word *symtab_shndx_start; 140 Elf32_Word *symtab_shndx_stop; 141 }; 142 143 static inline int is_shndx_special(unsigned int i) 144 { 145 return i != SHN_XINDEX && i >= SHN_LORESERVE && i <= SHN_HIRESERVE; 146 } 147 148 /* shndx is in [0..SHN_LORESERVE) U (SHN_HIRESERVE, 0xfffffff], thus: 149 * shndx == 0 <=> sechdrs[0] 150 * ...... 151 * shndx == SHN_LORESERVE-1 <=> sechdrs[SHN_LORESERVE-1] 152 * shndx == SHN_HIRESERVE+1 <=> sechdrs[SHN_LORESERVE] 153 * shndx == SHN_HIRESERVE+2 <=> sechdrs[SHN_LORESERVE+1] 154 * ...... 155 * fyi: sym->st_shndx is uint16, SHN_LORESERVE = ff00, SHN_HIRESERVE = ffff, 156 * so basically we map 0000..feff -> 0000..feff 157 * ff00..ffff -> (you are a bad boy, dont do it) 158 * 10000..xxxx -> ff00..(xxxx-0x100) 159 */ 160 static inline unsigned int shndx2secindex(unsigned int i) 161 { 162 if (i <= SHN_HIRESERVE) 163 return i; 164 return i - (SHN_HIRESERVE + 1 - SHN_LORESERVE); 165 } 166 167 /* Accessor for sym->st_shndx, hides ugliness of "64k sections" */ 168 static inline unsigned int get_secindex(const struct elf_info *info, 169 const Elf_Sym *sym) 170 { 171 if (sym->st_shndx != SHN_XINDEX) 172 return sym->st_shndx; 173 return shndx2secindex(info->symtab_shndx_start[sym - 174 info->symtab_start]); 175 } 176 177 /* file2alias.c */ 178 extern unsigned int cross_build; 179 void handle_moddevtable(struct module *mod, struct elf_info *info, 180 Elf_Sym *sym, const char *symname); 181 void add_moddevtable(struct buffer *buf, struct module *mod); 182 183 /* sumversion.c */ 184 void maybe_frob_rcs_version(const char *modfilename, 185 char *version, 186 void *modinfo, 187 unsigned long modinfo_offset); 188 void get_src_version(const char *modname, char sum[], unsigned sumlen); 189 190 /* from modpost.c */ 191 void *grab_file(const char *filename, unsigned long *size); 192 char* get_next_line(unsigned long *pos, void *file, unsigned long size); 193 void release_file(void *file, unsigned long size); 194 195 void fatal(const char *fmt, ...); 196 void warn(const char *fmt, ...); 197 void merror(const char *fmt, ...); 198