arch/h8300/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         printk(KERN_ERR "module %s: RELOCATION unsupported\n",
  46                me->name);
  47         return -ENOEXEC;
  48 }
  49
  50 int apply_relocate_add(Elf32_Shdr *sechdrs,
  51                        const char *strtab,
  52                        unsigned int symindex,
  53                        unsigned int relsec,
  54                        struct module *me)
  55 {
  56         unsigned int i;
  57         Elf32_Rela *rela = (void *)sechdrs[relsec].sh_addr;
  58
  59         DEBUGP("Applying relocate section %u to %u\n", relsec,
  60                sechdrs[relsec].sh_info);
  61         for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rela); i++) {
  62                 /* This is where to make the change */
  63                 uint32_t *loc = (uint32_t *)(sechdrs[sechdrs[relsec].sh_info].sh_addr
  64                                              + rela[i].r_offset);
  65                 /* This is the symbol it is referring to.  Note that all
  66                    undefined symbols have been resolved.  */
  67                 Elf32_Sym *sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
  68                         + ELF32_R_SYM(rela[i].r_info);
  69                 uint32_t v = sym->st_value + rela[i].r_addend;
  70
  71                 switch (ELF32_R_TYPE(rela[i].r_info)) {
  72                 case R_H8_DIR24R8:
  73                         loc = (uint32_t *)((uint32_t)loc - 1);
  74                         *loc = (*loc & 0xff000000) | ((*loc & 0xffffff) + v);
  75                         break;
  76                 case R_H8_DIR24A8:
  77                         if (ELF32_R_SYM(rela[i].r_info))
  78                                 *loc += v;
  79                         break;
  80                 case R_H8_DIR32:
  81                 case R_H8_DIR32A16:
  82                         *loc += v;
  83                         break;
  84                 case R_H8_PCREL16:
  85                         v -= (unsigned long)loc + 2;
  86                         if ((Elf32_Sword)v > 0x7fff ||
  87                             (Elf32_Sword)v < -(Elf32_Sword)0x8000)
  88                                 goto overflow;
  89                         else
  90                                 *(unsigned short *)loc = v;
  91                         break;
  92                 case R_H8_PCREL8:
  93                         v -= (unsigned long)loc + 1;
  94                         if ((Elf32_Sword)v > 0x7f ||
  95                             (Elf32_Sword)v < -(Elf32_Sword)0x80)
  96                                 goto overflow;
  97                         else
  98                                 *(unsigned char *)loc = v;
  99                         break;
 100                 default:
 101                         printk(KERN_ERR "module %s: Unknown relocation: %u\n",
 102                                me->name, ELF32_R_TYPE(rela[i].r_info));
 103                         return -ENOEXEC;
 104                 }
 105         }
 106         return 0;
 107  overflow:
 108         printk(KERN_ERR "module %s: relocation offset overflow: %08x\n",
 109                me->name, rela[i].r_offset);
 110         return -ENOEXEC;
 111 }
 112
 113 int module_finalize(const Elf_Ehdr *hdr,
 114                     const Elf_Shdr *sechdrs,
 115                     struct module *me)
 116 {
 117         return 0;
 118 }
 119
 120 void module_arch_cleanup(struct module *mod)
 121 {
 122 }