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