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 int is_dot_o; 117 }; 118 119 struct elf_info { 120 unsigned long size; 121 Elf_Ehdr *hdr; 122 Elf_Shdr *sechdrs; 123 Elf_Sym *symtab_start; 124 Elf_Sym *symtab_stop; 125 Elf_Section export_sec; 126 Elf_Section export_unused_sec; 127 Elf_Section export_gpl_sec; 128 Elf_Section export_unused_gpl_sec; 129 Elf_Section export_gpl_future_sec; 130 const char *strtab; 131 char *modinfo; 132 unsigned int modinfo_len; 133 134 /* support for 32bit section numbers */ 135 136 unsigned int num_sections; /* max_secindex + 1 */ 137 unsigned int secindex_strings; 138 /* if Nth symbol table entry has .st_shndx = SHN_XINDEX, 139 * take shndx from symtab_shndx_start[N] instead */ 140 Elf32_Word *symtab_shndx_start; 141 Elf32_Word *symtab_shndx_stop; 142 }; 143 144 static inline int is_shndx_special(unsigned int i) 145 { 146 return i != SHN_XINDEX && i >= SHN_LORESERVE && i <= SHN_HIRESERVE; 147 } 148 149 /* 150 * Move reserved section indices SHN_LORESERVE..SHN_HIRESERVE out of 151 * the way to -256..-1, to avoid conflicting with real section 152 * indices. 153 */ 154 #define SPECIAL(i) ((i) - (SHN_HIRESERVE + 1)) 155 156 /* Accessor for sym->st_shndx, hides ugliness of "64k sections" */ 157 static inline unsigned int get_secindex(const struct elf_info *info, 158 const Elf_Sym *sym) 159 { 160 if (is_shndx_special(sym->st_shndx)) 161 return SPECIAL(sym->st_shndx); 162 if (sym->st_shndx != SHN_XINDEX) 163 return sym->st_shndx; 164 return info->symtab_shndx_start[sym - info->symtab_start]; 165 } 166 167 /* file2alias.c */ 168 extern unsigned int cross_build; 169 void handle_moddevtable(struct module *mod, struct elf_info *info, 170 Elf_Sym *sym, const char *symname); 171 void add_moddevtable(struct buffer *buf, struct module *mod); 172 173 /* sumversion.c */ 174 void maybe_frob_rcs_version(const char *modfilename, 175 char *version, 176 void *modinfo, 177 unsigned long modinfo_offset); 178 void get_src_version(const char *modname, char sum[], unsigned sumlen); 179 180 /* from modpost.c */ 181 void *grab_file(const char *filename, unsigned long *size); 182 char* get_next_line(unsigned long *pos, void *file, unsigned long size); 183 void release_file(void *file, unsigned long size); 184 185 void fatal(const char *fmt, ...); 186 void warn(const char *fmt, ...); 187 void merror(const char *fmt, ...); 188