LXR linux/arch/h8300/kernel/module.c

   1// SPDX-License-Identifier: GPL-2.0
   2#include <linux/moduleloader.h>
   3#include <linux/elf.h>
   4#include <linux/vmalloc.h>
   5#include <linux/fs.h>
   6#include <linux/string.h>
   7#include <linux/kernel.h>
   8
   9int apply_relocate_add(Elf32_Shdr *sechdrs,
  10                       const char *strtab,
  11                       unsigned int symindex,
  12                       unsigned int relsec,
  13                       struct module *me)
  14{
  15        unsigned int i;
  16        Elf32_Rela *rela = (void *)sechdrs[relsec].sh_addr;
  17
  18        pr_debug("Applying relocate section %u to %u\n", relsec,
  19               sechdrs[relsec].sh_info);
  20        for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rela); i++) {
  21                /* This is where to make the change */
  22                uint32_t *loc =
  23                        (uint32_t *)(sechdrs[sechdrs[relsec].sh_info].sh_addr
  24                                             + rela[i].r_offset);
  25                /* This is the symbol it is referring to.  Note that all
  26                   undefined symbols have been resolved.  */
  27                Elf32_Sym *sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
  28                        + ELF32_R_SYM(rela[i].r_info);
  29                uint32_t v = sym->st_value + rela[i].r_addend;
  30
  31                switch (ELF32_R_TYPE(rela[i].r_info)) {
  32                case R_H8_DIR24R8:
  33                        loc = (uint32_t *)((uint32_t)loc - 1);
  34                        *loc = (*loc & 0xff000000) | ((*loc & 0xffffff) + v);
  35                        break;
  36                case R_H8_DIR24A8:
  37                        if (ELF32_R_SYM(rela[i].r_info))
  38                                *loc += v;
  39                        break;
  40                case R_H8_DIR32:
  41                case R_H8_DIR32A16:
  42                        *loc += v;
  43                        break;
  44                case R_H8_PCREL16:
  45                        v -= (unsigned long)loc + 2;
  46                        if ((Elf32_Sword)v > 0x7fff ||
  47                            (Elf32_Sword)v < -(Elf32_Sword)0x8000)
  48                                goto overflow;
  49                        else
  50                                *(unsigned short *)loc = v;
  51                        break;
  52                case R_H8_PCREL8:
  53                        v -= (unsigned long)loc + 1;
  54                        if ((Elf32_Sword)v > 0x7f ||
  55                            (Elf32_Sword)v < -(Elf32_Sword)0x80)
  56                                goto overflow;
  57                        else
  58                                *(unsigned char *)loc = v;
  59                        break;
  60                default:
  61                        pr_err("module %s: Unknown relocation: %u\n",
  62                               me->name, ELF32_R_TYPE(rela[i].r_info));
  63                        return -ENOEXEC;
  64                }
  65        }
  66        return 0;
  67 overflow:
  68        pr_err("module %s: relocation offset overflow: %08x\n",
  69               me->name, rela[i].r_offset);
  70        return -ENOEXEC;
  71}
  72