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 #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 };
 117
 118 struct elf_info {
 119         unsigned long size;
 120         Elf_Ehdr     *hdr;
 121         Elf_Shdr     *sechdrs;
 122         Elf_Sym      *symtab_start;
 123         Elf_Sym      *symtab_stop;
 124         Elf_Section  export_sec;
 125         Elf_Section  export_unused_sec;
 126         Elf_Section  export_gpl_sec;
 127         Elf_Section  export_unused_gpl_sec;
 128         Elf_Section  export_gpl_future_sec;
 129         const char   *strtab;
 130         char         *modinfo;
 131         unsigned int modinfo_len;
 132
 133         /* support for 32bit section numbers */
 134
 135         unsigned int num_sections; /* max_secindex + 1 */
 136         unsigned int secindex_strings;
 137         /* if Nth symbol table entry has .st_shndx = SHN_XINDEX,
 138          * take shndx from symtab_shndx_start[N] instead */
 139         Elf32_Word   *symtab_shndx_start;
 140         Elf32_Word   *symtab_shndx_stop;
 141 };
 142
 143 static inline int is_shndx_special(unsigned int i)
 144 {
 145         return i != SHN_XINDEX && i >= SHN_LORESERVE && i <= SHN_HIRESERVE;
 146 }
 147
 148 /* shndx is in [0..SHN_LORESERVE) U (SHN_HIRESERVE, 0xfffffff], thus:
 149  * shndx == 0               <=> sechdrs[0]
 150  * ......
 151  * shndx == SHN_LORESERVE-1 <=> sechdrs[SHN_LORESERVE-1]
 152  * shndx == SHN_HIRESERVE+1 <=> sechdrs[SHN_LORESERVE]
 153  * shndx == SHN_HIRESERVE+2 <=> sechdrs[SHN_LORESERVE+1]
 154  * ......
 155  * fyi: sym->st_shndx is uint16, SHN_LORESERVE = ff00, SHN_HIRESERVE = ffff,
 156  * so basically we map  0000..feff -> 0000..feff
 157  *                      ff00..ffff -> (you are a bad boy, dont do it)
 158  *                     10000..xxxx -> ff00..(xxxx-0x100)
 159  */
 160 static inline unsigned int shndx2secindex(unsigned int i)
 161 {
 162         if (i <= SHN_HIRESERVE)
 163                 return i;
 164         return i - (SHN_HIRESERVE + 1 - SHN_LORESERVE);
 165 }
 166
 167 /* Accessor for sym->st_shndx, hides ugliness of "64k sections" */
 168 static inline unsigned int get_secindex(const struct elf_info *info,
 169                                         const Elf_Sym *sym)
 170 {
 171         if (sym->st_shndx != SHN_XINDEX)
 172                 return sym->st_shndx;
 173         return shndx2secindex(info->symtab_shndx_start[sym -
 174                                                        info->symtab_start]);
 175 }
 176
 177 /* file2alias.c */
 178 extern unsigned int cross_build;
 179 void handle_moddevtable(struct module *mod, struct elf_info *info,
 180                         Elf_Sym *sym, const char *symname);
 181 void add_moddevtable(struct buffer *buf, struct module *mod);
 182
 183 /* sumversion.c */
 184 void maybe_frob_rcs_version(const char *modfilename,
 185                             char *version,
 186                             void *modinfo,
 187                             unsigned long modinfo_offset);
 188 void get_src_version(const char *modname, char sum[], unsigned sumlen);
 189
 190 /* from modpost.c */
 191 void *grab_file(const char *filename, unsigned long *size);
 192 char* get_next_line(unsigned long *pos, void *file, unsigned long size);
 193 void release_file(void *file, unsigned long size);
 194
 195 void fatal(const char *fmt, ...);
 196 void warn(const char *fmt, ...);
 197 void merror(const char *fmt, ...);