1/* SPDX-License-Identifier: GPL-2.0 */ 2#include <stdbool.h> 3#include <stdio.h> 4#include <stdlib.h> 5#include <stdarg.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 "list.h" 15#include "elfconfig.h" 16 17/* On BSD-alike OSes elf.h defines these according to host's word size */ 18#undef ELF_ST_BIND 19#undef ELF_ST_TYPE 20#undef ELF_R_SYM 21#undef ELF_R_TYPE 22 23#if KERNEL_ELFCLASS == ELFCLASS32 24 25#define Elf_Ehdr Elf32_Ehdr 26#define Elf_Shdr Elf32_Shdr 27#define Elf_Sym Elf32_Sym 28#define Elf_Addr Elf32_Addr 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_Section Elf64_Half 44#define ELF_ST_BIND ELF64_ST_BIND 45#define ELF_ST_TYPE ELF64_ST_TYPE 46 47#define Elf_Rel Elf64_Rel 48#define Elf_Rela Elf64_Rela 49#define ELF_R_SYM ELF64_R_SYM 50#define ELF_R_TYPE ELF64_R_TYPE 51#endif 52 53#if KERNEL_ELFDATA != HOST_ELFDATA 54 55static inline void __endian(const void *src, void *dest, unsigned int size) 56{ 57 unsigned int i; 58 for (i = 0; i < size; i++) 59 ((unsigned char*)dest)[i] = ((unsigned char*)src)[size - i-1]; 60} 61 62#define TO_NATIVE(x) \ 63({ \ 64 typeof(x) __x; \ 65 __endian(&(x), &(__x), sizeof(__x)); \ 66 __x; \ 67}) 68 69#else /* endianness matches */ 70 71#define TO_NATIVE(x) (x) 72 73#endif 74 75#define NOFAIL(ptr) do_nofail((ptr), #ptr) 76 77#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0])) 78 79void *do_nofail(void *ptr, const char *expr); 80 81struct buffer { 82 char *p; 83 int pos; 84 int size; 85}; 86 87void __attribute__((format(printf, 2, 3))) 88buf_printf(struct buffer *buf, const char *fmt, ...); 89 90void 91buf_write(struct buffer *buf, const char *s, int len); 92 93struct module { 94 struct list_head list; 95 struct list_head exported_symbols; 96 struct list_head unresolved_symbols; 97 bool is_gpl_compatible; 98 bool from_dump; /* true if module was loaded from *.symvers */ 99 bool is_vmlinux; 100 bool seen; 101 bool has_init; 102 bool has_cleanup; 103 struct buffer dev_table_buf; 104 char srcversion[25]; 105 // Missing namespace dependencies 106 struct list_head missing_namespaces; 107 // Actual imported namespaces 108 struct list_head imported_namespaces; 109 char name[]; 110}; 111 112struct elf_info { 113 size_t size; 114 Elf_Ehdr *hdr; 115 Elf_Shdr *sechdrs; 116 Elf_Sym *symtab_start; 117 Elf_Sym *symtab_stop; 118 unsigned int export_symbol_secndx; /* .export_symbol section */ 119 char *strtab; 120 char *modinfo; 121 unsigned int modinfo_len; 122 123 /* support for 32bit section numbers */ 124 125 unsigned int num_sections; /* max_secindex + 1 */ 126 unsigned int secindex_strings; 127 /* if Nth symbol table entry has .st_shndx = SHN_XINDEX, 128 * take shndx from symtab_shndx_start[N] instead */ 129 Elf32_Word *symtab_shndx_start; 130 Elf32_Word *symtab_shndx_stop; 131}; 132 133/* Accessor for sym->st_shndx, hides ugliness of "64k sections" */ 134static inline unsigned int get_secindex(const struct elf_info *info, 135 const Elf_Sym *sym) 136{ 137 unsigned int index = sym->st_shndx; 138 139 /* 140 * Elf{32,64}_Sym::st_shndx is 2 byte. Big section numbers are available 141 * in the .symtab_shndx section. 142 */ 143 if (index == SHN_XINDEX) 144 return info->symtab_shndx_start[sym - info->symtab_start]; 145 146 /* 147 * Move reserved section indices SHN_LORESERVE..SHN_HIRESERVE out of 148 * the way to UINT_MAX-255..UINT_MAX, to avoid conflicting with real 149 * section indices. 150 */ 151 if (index >= SHN_LORESERVE && index <= SHN_HIRESERVE) 152 return index - SHN_HIRESERVE - 1; 153 154 return index; 155} 156 157/* file2alias.c */ 158void handle_moddevtable(struct module *mod, struct elf_info *info, 159 Elf_Sym *sym, const char *symname); 160void add_moddevtable(struct buffer *buf, struct module *mod); 161 162/* sumversion.c */ 163void get_src_version(const char *modname, char sum[], unsigned sumlen); 164 165/* from modpost.c */ 166char *read_text_file(const char *filename); 167char *get_line(char **stringp); 168void *sym_get_data(const struct elf_info *info, const Elf_Sym *sym); 169 170enum loglevel { 171 LOG_WARN, 172 LOG_ERROR, 173 LOG_FATAL 174}; 175 176void modpost_log(enum loglevel loglevel, const char *fmt, ...); 177 178/* 179 * warn - show the given message, then let modpost continue running, still 180 * allowing modpost to exit successfully. This should be used when 181 * we still allow to generate vmlinux and modules. 182 * 183 * error - show the given message, then let modpost continue running, but fail 184 * in the end. This should be used when we should stop building vmlinux 185 * or modules, but we can continue running modpost to catch as many 186 * issues as possible. 187 * 188 * fatal - show the given message, and bail out immediately. This should be 189 * used when there is no point to continue running modpost. 190 */ 191#define warn(fmt, args...) modpost_log(LOG_WARN, fmt, ##args) 192#define error(fmt, args...) modpost_log(LOG_ERROR, fmt, ##args) 193#define fatal(fmt, args...) modpost_log(LOG_FATAL, fmt, ##args) 194