include/module.h

   1 #ifndef __MODULE_H
   2 #define __MODULE_H
   3
   4 #include <elf.h>
   5 #include <linux/compiler.h>
   6 #include <linux/list.h>
   7
   8 #ifndef MODULE_SYMBOL_PREFIX
   9 #define MODULE_SYMBOL_PREFIX
  10 #endif
  11
  12 #define MODULE_NAME_LEN (64 - sizeof(unsigned long))
  13
  14 #ifdef CONFIG_MODULES
  15 #include <asm/module.h>
  16
  17 struct kernel_symbol
  18 {
  19         unsigned long value;
  20         const char *name;
  21 };
  22
  23 struct module * load_module(void *mod_image, unsigned long len);
  24
  25 /* For every exported symbol, place a struct in the __ksymtab section */
  26 #define __EXPORT_SYMBOL(sym, sec)                               \
  27         extern typeof(sym) sym;                                 \
  28         static const char __ustrtab_##sym[]                     \
  29         __attribute__((section("__usymtab_strings")))           \
  30         = MODULE_SYMBOL_PREFIX #sym;                            \
  31         static const struct kernel_symbol __usymtab_##sym       \
  32         __used \
  33         __attribute__((section("__usymtab" sec), unused))       \
  34         = { (unsigned long)&sym, __ustrtab_##sym }
  35
  36 #define EXPORT_SYMBOL(sym)                                      \
  37         __EXPORT_SYMBOL(sym, "")
  38
  39 struct module {
  40         /* Unique handle for this module */
  41         char name[MODULE_NAME_LEN];
  42
  43         /* Startup function. */
  44         int (*init)(void);
  45
  46         /* Here is the actual code + data, free'd on unload. */
  47         void *module_core;
  48
  49         /* Arch-specific module values */
  50         struct mod_arch_specific arch;
  51
  52         unsigned long core_size;
  53
  54         struct list_head list;
  55 };
  56
  57 /* Apply the given relocation to the (simplified) ELF.  Return -error
  58    or 0. */
  59 int apply_relocate(Elf_Shdr *sechdrs,
  60                    const char *strtab,
  61                    unsigned int symindex,
  62                    unsigned int relsec,
  63                    struct module *mod);
  64
  65 /* Apply the given add relocation to the (simplified) ELF.  Return
  66    -error or 0 */
  67 int apply_relocate_add(Elf_Shdr *sechdrs,
  68                        const char *strtab,
  69                        unsigned int symindex,
  70                        unsigned int relsec,
  71                        struct module *mod);
  72 #else
  73 #define EXPORT_SYMBOL(sym)
  74 #endif /* CONFIG_MODULES */
  75
  76 extern struct list_head module_list;
  77
  78 #define for_each_module(m) \
  79         list_for_each_entry(m, &module_list, list)
  80
  81 #endif /* __MODULE_H */
  82