arch/m68k/kernel/module.c

   1 #include <linux/moduleloader.h>
   2 #include <linux/elf.h>
   3 #include <linux/vmalloc.h>
   4 #include <linux/fs.h>
   5 #include <linux/string.h>
   6 #include <linux/kernel.h>
   7
   8 #if 0
   9 #define DEBUGP printk
  10 #else
  11 #define DEBUGP(fmt...)
  12 #endif
  13
  14 void *module_alloc(unsigned long size)
  15 {
  16         if (size == 0)
  17                 return NULL;
  18         return vmalloc(size);
  19 }
  20
  21
  22 /* Free memory returned from module_alloc */
  23 void module_free(struct module *mod, void *module_region)
  24 {
  25         vfree(module_region);
  26         /* FIXME: If module_region == mod->init_region, trim exception
  27            table entries. */
  28 }
  29
  30 /* We don't need anything special. */
  31 int module_frob_arch_sections(Elf_Ehdr *hdr,
  32                               Elf_Shdr *sechdrs,
  33                               char *secstrings,
  34                               struct module *mod)
  35 {
  36         return 0;
  37 }
  38
  39 int apply_relocate(Elf32_Shdr *sechdrs,
  40                    const char *strtab,
  41                    unsigned int symindex,
  42                    unsigned int relsec,
  43                    struct module *me)
  44 {
  45         unsigned int i;
  46         Elf32_Rel *rel = (void *)sechdrs[relsec].sh_addr;
  47         Elf32_Sym *sym;
  48         uint32_t *location;
  49
  50         DEBUGP("Applying relocate section %u to %u\n", relsec,
  51                sechdrs[relsec].sh_info);
  52         for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
  53                 /* This is where to make the change */
  54                 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
  55                         + rel[i].r_offset;
  56                 /* This is the symbol it is referring to.  Note that all
  57                    undefined symbols have been resolved.  */
  58                 sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
  59                         + ELF32_R_SYM(rel[i].r_info);
  60
  61                 switch (ELF32_R_TYPE(rel[i].r_info)) {
  62                 case R_68K_32:
  63                         /* We add the value into the location given */
  64                         *location += sym->st_value;
  65                         break;
  66                 case R_68K_PC32:
  67                         /* Add the value, subtract its postition */
  68                         *location += sym->st_value - (uint32_t)location;
  69                         break;
  70                 default:
  71                         printk(KERN_ERR "module %s: Unknown relocation: %u\n",
  72                                me->name, ELF32_R_TYPE(rel[i].r_info));
  73                         return -ENOEXEC;
  74                 }
  75         }
  76         return 0;
  77 }
  78
  79 int apply_relocate_add(Elf32_Shdr *sechdrs,
  80                        const char *strtab,
  81                        unsigned int symindex,
  82                        unsigned int relsec,
  83                        struct module *me)
  84 {
  85         unsigned int i;
  86         Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr;
  87         Elf32_Sym *sym;
  88         uint32_t *location;
  89
  90         DEBUGP("Applying relocate_add section %u to %u\n", relsec,
  91                sechdrs[relsec].sh_info);
  92         for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
  93                 /* This is where to make the change */
  94                 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
  95                         + rel[i].r_offset;
  96                 /* This is the symbol it is referring to.  Note that all
  97                    undefined symbols have been resolved.  */
  98                 sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
  99                         + ELF32_R_SYM(rel[i].r_info);
 100
 101                 switch (ELF32_R_TYPE(rel[i].r_info)) {
 102                 case R_68K_32:
 103                         /* We add the value into the location given */
 104                         *location = rel[i].r_addend + sym->st_value;
 105                         break;
 106                 case R_68K_PC32:
 107                         /* Add the value, subtract its postition */
 108                         *location = rel[i].r_addend + sym->st_value - (uint32_t)location;
 109                         break;
 110                 default:
 111                         printk(KERN_ERR "module %s: Unknown relocation: %u\n",
 112                                me->name, ELF32_R_TYPE(rel[i].r_info));
 113                         return -ENOEXEC;
 114                 }
 115         }
 116         return 0;
 117 }
 118
 119 int module_finalize(const Elf_Ehdr *hdr,
 120                     const Elf_Shdr *sechdrs,
 121                     struct module *me)
 122 {
 123         return 0;
 124 }
 125
 126 void module_arch_cleanup(struct module *mod)
 127 {
 128 }