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
   8int apply_relocate_add(Elf32_Shdr *sechdrs,
   9                       const char *strtab,
  10                       unsigned int symindex,
  11                       unsigned int relsec,
  12                       struct module *me)
  13{
  14        unsigned int i;
  15        Elf32_Rela *rela = (void *)sechdrs[relsec].sh_addr;
  16
  17        pr_debug("Applying relocate section %u to %u\n", relsec,
  18               sechdrs[relsec].sh_info);
  19        for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rela); i++) {
  20                /* This is where to make the change */
  21                uint32_t *loc =
  22                        (uint32_t *)(sechdrs[sechdrs[relsec].sh_info].sh_addr
  23                                             + rela[i].r_offset);
  24                /* This is the symbol it is referring to.  Note that all
  25                   undefined symbols have been resolved.  */
  26                Elf32_Sym *sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
  27                        + ELF32_R_SYM(rela[i].r_info);
  28                uint32_t v = sym->st_value + rela[i].r_addend;
  29
  30                switch (ELF32_R_TYPE(rela[i].r_info)) {
  31                case R_H8_DIR24R8:
  32                        loc = (uint32_t *)((uint32_t)loc - 1);
  33                        *loc = (*loc & 0xff000000) | ((*loc & 0xffffff) + v);
  34                        break;
  35                case R_H8_DIR24A8:
  36                        if (ELF32_R_SYM(rela[i].r_info))
  37                                *loc += v;
  38                        break;
  39                case R_H8_DIR32:
  40                case R_H8_DIR32A16:
  41                        *loc += v;
  42                        break;
  43                case R_H8_PCREL16:
  44                        v -= (unsigned long)loc + 2;
  45                        if ((Elf32_Sword)v > 0x7fff ||
  46                            (Elf32_Sword)v < -(Elf32_Sword)0x8000)
  47                                goto overflow;
  48                        else
  49                                *(unsigned short *)loc = v;
  50                        break;
  51                case R_H8_PCREL8:
  52                        v -= (unsigned long)loc + 1;
  53                        if ((Elf32_Sword)v > 0x7f ||
  54                            (Elf32_Sword)v < -(Elf32_Sword)0x80)
  55                                goto overflow;
  56                        else
  57                                *(unsigned char *)loc = v;
  58                        break;
  59                default:
  60                        pr_err("module %s: Unknown relocation: %u\n",
  61                               me->name, ELF32_R_TYPE(rela[i].r_info));
  62                        return -ENOEXEC;
  63                }
  64        }
  65        return 0;
  66 overflow:
  67        pr_err("module %s: relocation offset overflow: %08x\n",
  68               me->name, rela[i].r_offset);
  69        return -ENOEXEC;
  70}
  71