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
  14int apply_relocate_add(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_Rela *rela = (void *)sechdrs[relsec].sh_addr;
  22
  23        DEBUGP("Applying relocate section %u to %u\n", relsec,
  24               sechdrs[relsec].sh_info);
  25        for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rela); i++) {
  26                /* This is where to make the change */
  27                uint32_t *loc = (uint32_t *)(sechdrs[sechdrs[relsec].sh_info].sh_addr
  28                                             + rela[i].r_offset);
  29                /* This is the symbol it is referring to.  Note that all
  30                   undefined symbols have been resolved.  */
  31                Elf32_Sym *sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
  32                        + ELF32_R_SYM(rela[i].r_info);
  33                uint32_t v = sym->st_value + rela[i].r_addend;
  34
  35                switch (ELF32_R_TYPE(rela[i].r_info)) {
  36                case R_H8_DIR24R8:
  37                        loc = (uint32_t *)((uint32_t)loc - 1);
  38                        *loc = (*loc & 0xff000000) | ((*loc & 0xffffff) + v);
  39                        break;
  40                case R_H8_DIR24A8:
  41                        if (ELF32_R_SYM(rela[i].r_info))
  42                                *loc += v;
  43                        break;
  44                case R_H8_DIR32:
  45                case R_H8_DIR32A16:
  46                        *loc += v;
  47                        break;
  48                case R_H8_PCREL16:
  49                        v -= (unsigned long)loc + 2;
  50                        if ((Elf32_Sword)v > 0x7fff || 
  51                            (Elf32_Sword)v < -(Elf32_Sword)0x8000)
  52                                goto overflow;
  53                        else 
  54                                *(unsigned short *)loc = v;
  55                        break;
  56                case R_H8_PCREL8:
  57                        v -= (unsigned long)loc + 1;
  58                        if ((Elf32_Sword)v > 0x7f || 
  59                            (Elf32_Sword)v < -(Elf32_Sword)0x80)
  60                                goto overflow;
  61                        else 
  62                                *(unsigned char *)loc = v;
  63                        break;
  64                default:
  65                        printk(KERN_ERR "module %s: Unknown relocation: %u\n",
  66                               me->name, ELF32_R_TYPE(rela[i].r_info));
  67                        return -ENOEXEC;
  68                }
  69        }
  70        return 0;
  71 overflow:
  72        printk(KERN_ERR "module %s: relocation offset overflow: %08x\n",
  73               me->name, rela[i].r_offset);
  74        return -ENOEXEC;
  75}
  76