linux/include/linux/moduleloader.h
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   1#ifndef _LINUX_MODULELOADER_H
   2#define _LINUX_MODULELOADER_H
   3/* The stuff needed for archs to support modules. */
   4
   5#include <linux/module.h>
   6#include <linux/elf.h>
   7
   8/* These may be implemented by architectures that need to hook into the
   9 * module loader code.  Architectures that don't need to do anything special
  10 * can just rely on the 'weak' default hooks defined in kernel/module.c.
  11 * Note, however, that at least one of apply_relocate or apply_relocate_add
  12 * must be implemented by each architecture.
  13 */
  14
  15/* Adjust arch-specific sections.  Return 0 on success.  */
  16int module_frob_arch_sections(Elf_Ehdr *hdr,
  17                              Elf_Shdr *sechdrs,
  18                              char *secstrings,
  19                              struct module *mod);
  20
  21/* Additional bytes needed by arch in front of individual sections */
  22unsigned int arch_mod_section_prepend(struct module *mod, unsigned int section);
  23
  24/* Allocator used for allocating struct module, core sections and init
  25   sections.  Returns NULL on failure. */
  26void *module_alloc(unsigned long size);
  27
  28/* Free memory returned from module_alloc. */
  29void module_free(struct module *mod, void *module_region);
  30
  31/*
  32 * Apply the given relocation to the (simplified) ELF.  Return -error
  33 * or 0.
  34 */
  35#ifdef CONFIG_MODULES_USE_ELF_REL
  36int apply_relocate(Elf_Shdr *sechdrs,
  37                   const char *strtab,
  38                   unsigned int symindex,
  39                   unsigned int relsec,
  40                   struct module *mod);
  41#else
  42static inline int apply_relocate(Elf_Shdr *sechdrs,
  43                                 const char *strtab,
  44                                 unsigned int symindex,
  45                                 unsigned int relsec,
  46                                 struct module *me)
  47{
  48        printk(KERN_ERR "module %s: REL relocation unsupported\n", me->name);
  49        return -ENOEXEC;
  50}
  51#endif
  52
  53/*
  54 * Apply the given add relocation to the (simplified) ELF.  Return
  55 * -error or 0
  56 */
  57#ifdef CONFIG_MODULES_USE_ELF_RELA
  58int apply_relocate_add(Elf_Shdr *sechdrs,
  59                       const char *strtab,
  60                       unsigned int symindex,
  61                       unsigned int relsec,
  62                       struct module *mod);
  63#else
  64static inline int apply_relocate_add(Elf_Shdr *sechdrs,
  65                                     const char *strtab,
  66                                     unsigned int symindex,
  67                                     unsigned int relsec,
  68                                     struct module *me)
  69{
  70        printk(KERN_ERR "module %s: REL relocation unsupported\n", me->name);
  71        return -ENOEXEC;
  72}
  73#endif
  74
  75/* Any final processing of module before access.  Return -error or 0. */
  76int module_finalize(const Elf_Ehdr *hdr,
  77                    const Elf_Shdr *sechdrs,
  78                    struct module *mod);
  79
  80/* Any cleanup needed when module leaves. */
  81void module_arch_cleanup(struct module *mod);
  82
  83#endif
  84
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