LXR linux/arch/m68k/kernel/module.c

   1/*
   2 * This file is subject to the terms and conditions of the GNU General Public
   3 * License.  See the file COPYING in the main directory of this archive
   4 * for more details.
   5 */
   6
   7#include <linux/moduleloader.h>
   8#include <linux/elf.h>
   9#include <linux/vmalloc.h>
  10#include <linux/fs.h>
  11#include <linux/string.h>
  12#include <linux/kernel.h>
  13
  14#if 0
  15#define DEBUGP(fmt, ...) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
  16#else
  17#define DEBUGP(fmt, ...) no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
  18#endif
  19
  20#ifdef CONFIG_MODULES
  21
  22int apply_relocate(Elf32_Shdr *sechdrs,
  23                   const char *strtab,
  24                   unsigned int symindex,
  25                   unsigned int relsec,
  26                   struct module *me)
  27{
  28        unsigned int i;
  29        Elf32_Rel *rel = (void *)sechdrs[relsec].sh_addr;
  30        Elf32_Sym *sym;
  31        uint32_t *location;
  32
  33        DEBUGP("Applying relocate section %u to %u\n", relsec,
  34               sechdrs[relsec].sh_info);
  35        for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
  36                /* This is where to make the change */
  37                location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
  38                        + rel[i].r_offset;
  39                /* This is the symbol it is referring to.  Note that all
  40                   undefined symbols have been resolved.  */
  41                sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
  42                        + ELF32_R_SYM(rel[i].r_info);
  43
  44                switch (ELF32_R_TYPE(rel[i].r_info)) {
  45                case R_68K_32:
  46                        /* We add the value into the location given */
  47                        *location += sym->st_value;
  48                        break;
  49                case R_68K_PC32:
  50                        /* Add the value, subtract its position */
  51                        *location += sym->st_value - (uint32_t)location;
  52                        break;
  53                default:
  54                        pr_err("module %s: Unknown relocation: %u\n", me->name,
  55                               ELF32_R_TYPE(rel[i].r_info));
  56                        return -ENOEXEC;
  57                }
  58        }
  59        return 0;
  60}
  61
  62int apply_relocate_add(Elf32_Shdr *sechdrs,
  63                       const char *strtab,
  64                       unsigned int symindex,
  65                       unsigned int relsec,
  66                       struct module *me)
  67{
  68        unsigned int i;
  69        Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr;
  70        Elf32_Sym *sym;
  71        uint32_t *location;
  72
  73        DEBUGP("Applying relocate_add section %u to %u\n", relsec,
  74               sechdrs[relsec].sh_info);
  75        for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
  76                /* This is where to make the change */
  77                location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
  78                        + rel[i].r_offset;
  79                /* This is the symbol it is referring to.  Note that all
  80                   undefined symbols have been resolved.  */
  81                sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
  82                        + ELF32_R_SYM(rel[i].r_info);
  83
  84                switch (ELF32_R_TYPE(rel[i].r_info)) {
  85                case R_68K_32:
  86                        /* We add the value into the location given */
  87                        *location = rel[i].r_addend + sym->st_value;
  88                        break;
  89                case R_68K_PC32:
  90                        /* Add the value, subtract its position */
  91                        *location = rel[i].r_addend + sym->st_value - (uint32_t)location;
  92                        break;
  93                default:
  94                        pr_err("module %s: Unknown relocation: %u\n", me->name,
  95                               ELF32_R_TYPE(rel[i].r_info));
  96                        return -ENOEXEC;
  97                }
  98        }
  99        return 0;
 100}
 101
 102int module_finalize(const Elf_Ehdr *hdr,
 103                    const Elf_Shdr *sechdrs,
 104                    struct module *mod)
 105{
 106        module_fixup(mod, mod->arch.fixup_start, mod->arch.fixup_end);
 107        return 0;
 108}
 109
 110#endif /* CONFIG_MODULES */
 111
 112void module_fixup(struct module *mod, struct m68k_fixup_info *start,
 113                  struct m68k_fixup_info *end)
 114{
 115#ifdef CONFIG_MMU
 116        struct m68k_fixup_info *fixup;
 117
 118        for (fixup = start; fixup < end; fixup++) {
 119                switch (fixup->type) {
 120                case m68k_fixup_memoffset:
 121                        *(u32 *)fixup->addr = m68k_memoffset;
 122                        break;
 123                case m68k_fixup_vnode_shift:
 124                        *(u16 *)fixup->addr += m68k_virt_to_node_shift;
 125                        break;
 126                }
 127        }
 128#endif
 129}
 130