linux/scripts/mod/modpost.h
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   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. */
  47typedef 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
  56typedef 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
  70static 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)
  91void *do_nofail(void *ptr, const char *expr);
  92
  93struct buffer {
  94        char *p;
  95        int pos;
  96        int size;
  97};
  98
  99void __attribute__((format(printf, 2, 3)))
 100buf_printf(struct buffer *buf, const char *fmt, ...);
 101
 102void
 103buf_write(struct buffer *buf, const char *s, int len);
 104
 105struct 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        int is_dot_o;
 117};
 118
 119struct elf_info {
 120        unsigned long size;
 121        Elf_Ehdr     *hdr;
 122        Elf_Shdr     *sechdrs;
 123        Elf_Sym      *symtab_start;
 124        Elf_Sym      *symtab_stop;
 125        Elf_Section  export_sec;
 126        Elf_Section  export_unused_sec;
 127        Elf_Section  export_gpl_sec;
 128        Elf_Section  export_unused_gpl_sec;
 129        Elf_Section  export_gpl_future_sec;
 130        const char   *strtab;
 131        char         *modinfo;
 132        unsigned int modinfo_len;
 133
 134        /* support for 32bit section numbers */
 135
 136        unsigned int num_sections; /* max_secindex + 1 */
 137        unsigned int secindex_strings;
 138        /* if Nth symbol table entry has .st_shndx = SHN_XINDEX,
 139         * take shndx from symtab_shndx_start[N] instead */
 140        Elf32_Word   *symtab_shndx_start;
 141        Elf32_Word   *symtab_shndx_stop;
 142};
 143
 144static inline int is_shndx_special(unsigned int i)
 145{
 146        return i != SHN_XINDEX && i >= SHN_LORESERVE && i <= SHN_HIRESERVE;
 147}
 148
 149/*
 150 * Move reserved section indices SHN_LORESERVE..SHN_HIRESERVE out of
 151 * the way to -256..-1, to avoid conflicting with real section
 152 * indices.
 153 */
 154#define SPECIAL(i) ((i) - (SHN_HIRESERVE + 1))
 155
 156/* Accessor for sym->st_shndx, hides ugliness of "64k sections" */
 157static inline unsigned int get_secindex(const struct elf_info *info,
 158                                        const Elf_Sym *sym)
 159{
 160        if (is_shndx_special(sym->st_shndx))
 161                return SPECIAL(sym->st_shndx);
 162        if (sym->st_shndx != SHN_XINDEX)
 163                return sym->st_shndx;
 164        return info->symtab_shndx_start[sym - info->symtab_start];
 165}
 166
 167/* file2alias.c */
 168extern unsigned int cross_build;
 169void handle_moddevtable(struct module *mod, struct elf_info *info,
 170                        Elf_Sym *sym, const char *symname);
 171void add_moddevtable(struct buffer *buf, struct module *mod);
 172
 173/* sumversion.c */
 174void maybe_frob_rcs_version(const char *modfilename,
 175                            char *version,
 176                            void *modinfo,
 177                            unsigned long modinfo_offset);
 178void get_src_version(const char *modname, char sum[], unsigned sumlen);
 179
 180/* from modpost.c */
 181void *grab_file(const char *filename, unsigned long *size);
 182char* get_next_line(unsigned long *pos, void *file, unsigned long size);
 183void release_file(void *file, unsigned long size);
 184
 185void fatal(const char *fmt, ...);
 186void warn(const char *fmt, ...);
 187void merror(const char *fmt, ...);
 188
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