include/linux/moduleloader.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _LINUX_MODULELOADER_H
   3 #define _LINUX_MODULELOADER_H
   4 /* The stuff needed for archs to support modules. */
   5
   6 #include <linux/module.h>
   7 #include <linux/elf.h>
   8
   9 /* These may be implemented by architectures that need to hook into the
  10  * module loader code.  Architectures that don't need to do anything special
  11  * can just rely on the 'weak' default hooks defined in kernel/module.c.
  12  * Note, however, that at least one of apply_relocate or apply_relocate_add
  13  * must be implemented by each architecture.
  14  */
  15
  16 /* Adjust arch-specific sections.  Return 0 on success.  */
  17 int module_frob_arch_sections(Elf_Ehdr *hdr,
  18                               Elf_Shdr *sechdrs,
  19                               char *secstrings,
  20                               struct module *mod);
  21
  22 /* Additional bytes needed by arch in front of individual sections */
  23 unsigned int arch_mod_section_prepend(struct module *mod, unsigned int section);
  24
  25 /* Allocator used for allocating struct module, core sections and init
  26    sections.  Returns NULL on failure. */
  27 void *module_alloc(unsigned long size);
  28
  29 /* Free memory returned from module_alloc. */
  30 void module_memfree(void *module_region);
  31
  32 /*
  33  * Apply the given relocation to the (simplified) ELF.  Return -error
  34  * or 0.
  35  */
  36 #ifdef CONFIG_MODULES_USE_ELF_REL
  37 int apply_relocate(Elf_Shdr *sechdrs,
  38                    const char *strtab,
  39                    unsigned int symindex,
  40                    unsigned int relsec,
  41                    struct module *mod);
  42 #else
  43 static inline int apply_relocate(Elf_Shdr *sechdrs,
  44                                  const char *strtab,
  45                                  unsigned int symindex,
  46                                  unsigned int relsec,
  47                                  struct module *me)
  48 {
  49         printk(KERN_ERR "module %s: REL relocation unsupported\n",
  50                module_name(me));
  51         return -ENOEXEC;
  52 }
  53 #endif
  54
  55 /*
  56  * Apply the given add relocation to the (simplified) ELF.  Return
  57  * -error or 0
  58  */
  59 #ifdef CONFIG_MODULES_USE_ELF_RELA
  60 int apply_relocate_add(Elf_Shdr *sechdrs,
  61                        const char *strtab,
  62                        unsigned int symindex,
  63                        unsigned int relsec,
  64                        struct module *mod);
  65 #else
  66 static inline int apply_relocate_add(Elf_Shdr *sechdrs,
  67                                      const char *strtab,
  68                                      unsigned int symindex,
  69                                      unsigned int relsec,
  70                                      struct module *me)
  71 {
  72         printk(KERN_ERR "module %s: REL relocation unsupported\n",
  73                module_name(me));
  74         return -ENOEXEC;
  75 }
  76 #endif
  77
  78 /* Any final processing of module before access.  Return -error or 0. */
  79 int module_finalize(const Elf_Ehdr *hdr,
  80                     const Elf_Shdr *sechdrs,
  81                     struct module *mod);
  82
  83 /* Any cleanup needed when module leaves. */
  84 void module_arch_cleanup(struct module *mod);
  85
  86 /* Any cleanup before freeing mod->module_init */
  87 void module_arch_freeing_init(struct module *mod);
  88
  89 #ifdef CONFIG_KASAN
  90 #include <linux/kasan.h>
  91 #define MODULE_ALIGN (PAGE_SIZE << KASAN_SHADOW_SCALE_SHIFT)
  92 #else
  93 #define MODULE_ALIGN PAGE_SIZE
  94 #endif
  95
  96 #endif