arch/m68k/kernel/module_no.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 int apply_relocate(Elf32_Shdr *sechdrs,
  15                    const char *strtab,
  16                    unsigned int symindex,
  17                    unsigned int relsec,
  18                    struct module *me)
  19 {
  20         unsigned int i;
  21         Elf32_Rel *rel = (void *)sechdrs[relsec].sh_addr;
  22         Elf32_Sym *sym;
  23         uint32_t *location;
  24
  25         DEBUGP("Applying relocate section %u to %u\n", relsec,
  26                sechdrs[relsec].sh_info);
  27         for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
  28                 /* This is where to make the change */
  29                 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
  30                         + rel[i].r_offset;
  31                 /* This is the symbol it is referring to.  Note that all
  32                    undefined symbols have been resolved.  */
  33                 sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
  34                         + ELF32_R_SYM(rel[i].r_info);
  35
  36                 switch (ELF32_R_TYPE(rel[i].r_info)) {
  37                 case R_68K_32:
  38                         /* We add the value into the location given */
  39                         *location += sym->st_value;
  40                         break;
  41                 case R_68K_PC32:
  42                         /* Add the value, subtract its postition */
  43                         *location += sym->st_value - (uint32_t)location;
  44                         break;
  45                 default:
  46                         printk(KERN_ERR "module %s: Unknown relocation: %u\n",
  47                                me->name, ELF32_R_TYPE(rel[i].r_info));
  48                         return -ENOEXEC;
  49                 }
  50         }
  51         return 0;
  52 }
  53
  54 int apply_relocate_add(Elf32_Shdr *sechdrs,
  55                        const char *strtab,
  56                        unsigned int symindex,
  57                        unsigned int relsec,
  58                        struct module *me)
  59 {
  60         unsigned int i;
  61         Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr;
  62         Elf32_Sym *sym;
  63         uint32_t *location;
  64
  65         DEBUGP("Applying relocate_add section %u to %u\n", relsec,
  66                sechdrs[relsec].sh_info);
  67         for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
  68                 /* This is where to make the change */
  69                 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
  70                         + rel[i].r_offset;
  71                 /* This is the symbol it is referring to.  Note that all
  72                    undefined symbols have been resolved.  */
  73                 sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
  74                         + ELF32_R_SYM(rel[i].r_info);
  75
  76                 switch (ELF32_R_TYPE(rel[i].r_info)) {
  77                 case R_68K_32:
  78                         /* We add the value into the location given */
  79                         *location = rel[i].r_addend + sym->st_value;
  80                         break;
  81                 case R_68K_PC32:
  82                         /* Add the value, subtract its postition */
  83                         *location = rel[i].r_addend + sym->st_value - (uint32_t)location;
  84                         break;
  85                 default:
  86                         printk(KERN_ERR "module %s: Unknown relocation: %u\n",
  87                                me->name, ELF32_R_TYPE(rel[i].r_info));
  88                         return -ENOEXEC;
  89                 }
  90         }
  91         return 0;
  92 }