arch/m68knommu/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 }
  27
  28 /* We don't need anything special. */
  29 int module_frob_arch_sections(Elf_Ehdr *hdr,
  30                               Elf_Shdr *sechdrs,
  31                               char *secstrings,
  32                               struct module *mod)
  33 {
  34         return 0;
  35 }
  36
  37 int apply_relocate(Elf32_Shdr *sechdrs,
  38                    const char *strtab,
  39                    unsigned int symindex,
  40                    unsigned int relsec,
  41                    struct module *me)
  42 {
  43         unsigned int i;
  44         Elf32_Rel *rel = (void *)sechdrs[relsec].sh_addr;
  45         Elf32_Sym *sym;
  46         uint32_t *location;
  47
  48         DEBUGP("Applying relocate section %u to %u\n", relsec,
  49                sechdrs[relsec].sh_info);
  50         for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
  51                 /* This is where to make the change */
  52                 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
  53                         + rel[i].r_offset;
  54                 /* This is the symbol it is referring to.  Note that all
  55                    undefined symbols have been resolved.  */
  56                 sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
  57                         + ELF32_R_SYM(rel[i].r_info);
  58
  59                 switch (ELF32_R_TYPE(rel[i].r_info)) {
  60                 case R_68K_32:
  61                         /* We add the value into the location given */
  62                         *location += sym->st_value;
  63                         break;
  64                 case R_68K_PC32:
  65                         /* Add the value, subtract its postition */
  66                         *location += sym->st_value - (uint32_t)location;
  67                         break;
  68                 default:
  69                         printk(KERN_ERR "module %s: Unknown relocation: %u\n",
  70                                me->name, ELF32_R_TYPE(rel[i].r_info));
  71                         return -ENOEXEC;
  72                 }
  73         }
  74         return 0;
  75 }
  76
  77 int apply_relocate_add(Elf32_Shdr *sechdrs,
  78                        const char *strtab,
  79                        unsigned int symindex,
  80                        unsigned int relsec,
  81                        struct module *me)
  82 {
  83         unsigned int i;
  84         Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr;
  85         Elf32_Sym *sym;
  86         uint32_t *location;
  87
  88         DEBUGP("Applying relocate_add section %u to %u\n", relsec,
  89                sechdrs[relsec].sh_info);
  90         for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
  91                 /* This is where to make the change */
  92                 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
  93                         + rel[i].r_offset;
  94                 /* This is the symbol it is referring to.  Note that all
  95                    undefined symbols have been resolved.  */
  96                 sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
  97                         + ELF32_R_SYM(rel[i].r_info);
  98
  99                 switch (ELF32_R_TYPE(rel[i].r_info)) {
 100                 case R_68K_32:
 101                         /* We add the value into the location given */
 102                         *location = rel[i].r_addend + sym->st_value;
 103                         break;
 104                 case R_68K_PC32:
 105                         /* Add the value, subtract its postition */
 106                         *location = rel[i].r_addend + sym->st_value - (uint32_t)location;
 107                         break;
 108                 default:
 109                         printk(KERN_ERR "module %s: Unknown relocation: %u\n",
 110                                me->name, ELF32_R_TYPE(rel[i].r_info));
 111                         return -ENOEXEC;
 112                 }
 113         }
 114         return 0;
 115 }
 116
 117 int module_finalize(const Elf_Ehdr *hdr,
 118                     const Elf_Shdr *sechdrs,
 119                     struct module *me)
 120 {
 121         return 0;
 122 }
 123
 124 void module_arch_cleanup(struct module *mod)
 125 {
 126 }