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. */ 55typedef 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 64typedef 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 78static 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) 99void *do_nofail(void *ptr, const char *expr); 100 101struct buffer { 102 char *p; 103 int pos; 104 int size; 105}; 106 107void __attribute__((format(printf, 2, 3))) 108buf_printf(struct buffer *buf, const char *fmt, ...); 109 110void 111buf_write(struct buffer *buf, const char *s, int len); 112 113struct namespace_list { 114 struct namespace_list *next; 115 char namespace[]; 116}; 117 118struct 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 136struct 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_unused_sec; 144 Elf_Section export_gpl_sec; 145 Elf_Section export_unused_gpl_sec; 146 Elf_Section export_gpl_future_sec; 147 char *strtab; 148 char *modinfo; 149 unsigned int modinfo_len; 150 151 /* support for 32bit section numbers */ 152 153 unsigned int num_sections; /* max_secindex + 1 */ 154 unsigned int secindex_strings; 155 /* if Nth symbol table entry has .st_shndx = SHN_XINDEX, 156 * take shndx from symtab_shndx_start[N] instead */ 157 Elf32_Word *symtab_shndx_start; 158 Elf32_Word *symtab_shndx_stop; 159}; 160 161static inline int is_shndx_special(unsigned int i) 162{ 163 return i != SHN_XINDEX && i >= SHN_LORESERVE && i <= SHN_HIRESERVE; 164} 165 166/* 167 * Move reserved section indices SHN_LORESERVE..SHN_HIRESERVE out of 168 * the way to -256..-1, to avoid conflicting with real section 169 * indices. 170 */ 171#define SPECIAL(i) ((i) - (SHN_HIRESERVE + 1)) 172 173/* Accessor for sym->st_shndx, hides ugliness of "64k sections" */ 174static inline unsigned int get_secindex(const struct elf_info *info, 175 const Elf_Sym *sym) 176{ 177 if (is_shndx_special(sym->st_shndx)) 178 return SPECIAL(sym->st_shndx); 179 if (sym->st_shndx != SHN_XINDEX) 180 return sym->st_shndx; 181 return info->symtab_shndx_start[sym - info->symtab_start]; 182} 183 184static inline bool strends(const char *str, const char *postfix) 185{ 186 if (strlen(str) < strlen(postfix)) 187 return false; 188 189 return strcmp(str + strlen(str) - strlen(postfix), postfix) == 0; 190} 191 192/* file2alias.c */ 193extern unsigned int cross_build; 194void handle_moddevtable(struct module *mod, struct elf_info *info, 195 Elf_Sym *sym, const char *symname); 196void add_moddevtable(struct buffer *buf, struct module *mod); 197 198/* sumversion.c */ 199void get_src_version(const char *modname, char sum[], unsigned sumlen); 200 201/* from modpost.c */ 202char *read_text_file(const char *filename); 203char *get_line(char **stringp); 204 205enum loglevel { 206 LOG_WARN, 207 LOG_ERROR, 208 LOG_FATAL 209}; 210 211void modpost_log(enum loglevel loglevel, const char *fmt, ...); 212 213#define warn(fmt, args...) modpost_log(LOG_WARN, fmt, ##args) 214#define merror(fmt, args...) modpost_log(LOG_ERROR, fmt, ##args) 215#define fatal(fmt, args...) modpost_log(LOG_FATAL, fmt, ##args) 216