include/grub/dl.h

   1 /* dl.h - types and prototypes for loadable module support */
   2 /*
   3  *  GRUB  --  GRand Unified Bootloader
   4  *  Copyright (C) 2002,2004,2005,2007,2008,2009  Free Software Foundation, Inc.
   5  *
   6  *  GRUB is free software: you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation, either version 3 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  GRUB is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #ifndef GRUB_DL_H
  21 #define GRUB_DL_H       1
  22
  23 #include <grub/symbol.h>
  24 #include <grub/err.h>
  25 #include <grub/types.h>
  26 #include <grub/elf.h>
  27
  28 #define GRUB_MOD_INIT(name)     \
  29 static void grub_mod_init (grub_dl_t mod __attribute__ ((unused))) __attribute__ ((used)); \
  30 void grub_##name##_init (void); \
  31 void \
  32 grub_##name##_init (void) { grub_mod_init (0); } \
  33 static void \
  34 grub_mod_init (grub_dl_t mod __attribute__ ((unused)))
  35
  36 #define GRUB_MOD_FINI(name)     \
  37 static void grub_mod_fini (void) __attribute__ ((used)); \
  38 void grub_##name##_fini (void); \
  39 void \
  40 grub_##name##_fini (void) { grub_mod_fini (); } \
  41 static void \
  42 grub_mod_fini (void)
  43
  44 #ifdef APPLE_CC
  45 #define GRUB_MOD_NAME(name)     \
  46 static char grub_modname[] __attribute__ ((section ("_modname, _modname"), used)) = #name;
  47
  48 #define GRUB_MOD_DEP(name)      \
  49 __asm__ (".section _moddeps, _moddeps\n.asciz \"" #name "\"\n")
  50 #else
  51 #define GRUB_MOD_NAME(name)     \
  52 __asm__ (".section .modname\n.asciz \"" #name "\"\n")
  53
  54 #define GRUB_MOD_DEP(name)      \
  55 __asm__ (".section .moddeps\n.asciz \"" #name "\"\n")
  56 #endif
  57
  58 struct grub_dl_segment
  59 {
  60   struct grub_dl_segment *next;
  61   void *addr;
  62   grub_size_t size;
  63   unsigned section;
  64 };
  65 typedef struct grub_dl_segment *grub_dl_segment_t;
  66
  67 struct grub_dl;
  68
  69 struct grub_dl_dep
  70 {
  71   struct grub_dl_dep *next;
  72   struct grub_dl *mod;
  73 };
  74 typedef struct grub_dl_dep *grub_dl_dep_t;
  75
  76 struct grub_dl
  77 {
  78   char *name;
  79   int ref_count;
  80   grub_dl_dep_t dep;
  81   grub_dl_segment_t segment;
  82   Elf_Sym *symtab;
  83   void (*init) (struct grub_dl *mod);
  84   void (*fini) (void);
  85 };
  86 typedef struct grub_dl *grub_dl_t;
  87
  88 grub_dl_t EXPORT_FUNC(grub_dl_load_file) (const char *filename);
  89 grub_dl_t EXPORT_FUNC(grub_dl_load) (const char *name);
  90 grub_dl_t grub_dl_load_core (void *addr, grub_size_t size);
  91 int EXPORT_FUNC(grub_dl_unload) (grub_dl_t mod);
  92 void grub_dl_unload_unneeded (void);
  93 void grub_dl_unload_all (void);
  94 #ifdef GRUB_UTIL
  95 static inline int
  96 grub_dl_ref (grub_dl_t mod)
  97 {
  98   (void) mod;
  99   return 0;
 100 }
 101 static inline int
 102 grub_dl_unref (grub_dl_t mod)
 103 {
 104   (void) mod;
 105   return 0;
 106 }
 107 #else
 108 int EXPORT_FUNC(grub_dl_ref) (grub_dl_t mod);
 109 int EXPORT_FUNC(grub_dl_unref) (grub_dl_t mod);
 110 #endif
 111 void EXPORT_FUNC(grub_dl_iterate) (int (*hook) (grub_dl_t mod));
 112 grub_dl_t EXPORT_FUNC(grub_dl_get) (const char *name);
 113 grub_err_t EXPORT_FUNC(grub_dl_register_symbol) (const char *name, void *addr,
 114                                             grub_dl_t mod);
 115
 116 grub_err_t grub_arch_dl_check_header (void *ehdr);
 117 grub_err_t grub_arch_dl_relocate_symbols (grub_dl_t mod, void *ehdr);
 118
 119 #endif /* ! GRUB_DL_H */