Kyle Swenson | 8d8f654 | 2021-03-15 11:02:55 -0600 | [diff] [blame] | 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, ...); |