scripts/mod/modpost.h

   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, ...);