LXR linux/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
  14void *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 */
  23void module_free(struct module *mod, void *module_region)
  24{
  25        vfree(module_region);
  26}
  27
  28/* We don't need anything special. */
  29int module_frob_arch_sections(Elf_Ehdr *hdr,
  30                              Elf_Shdr *sechdrs,
  31                              char *secstrings,
  32                              struct module *mod)
  33{
  34        return 0;
  35}
  36
  37int 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
  48int 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
 111int 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
 118void module_arch_cleanup(struct module *mod)
 119{
 120        module_bug_cleanup(mod);
 121}
 122