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 printk
  16#else
  17#define DEBUGP(fmt...)
  18#endif
  19
  20#ifdef CONFIG_MODULES
  21
  22void *module_alloc(unsigned long size)
  23{
  24        if (size == 0)
  25                return NULL;
  26        return vmalloc(size);
  27}
  28
  29
  30/* Free memory returned from module_alloc */
  31void module_free(struct module *mod, void *module_region)
  32{
  33        vfree(module_region);
  34}
  35
  36/* We don't need anything special. */
  37int module_frob_arch_sections(Elf_Ehdr *hdr,
  38                              Elf_Shdr *sechdrs,
  39                              char *secstrings,
  40                              struct module *mod)
  41{
  42        return 0;
  43}
  44
  45int apply_relocate(Elf32_Shdr *sechdrs,
  46                   const char *strtab,
  47                   unsigned int symindex,
  48                   unsigned int relsec,
  49                   struct module *me)
  50{
  51        unsigned int i;
  52        Elf32_Rel *rel = (void *)sechdrs[relsec].sh_addr;
  53        Elf32_Sym *sym;
  54        uint32_t *location;
  55
  56        DEBUGP("Applying relocate section %u to %u\n", relsec,
  57               sechdrs[relsec].sh_info);
  58        for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
  59                /* This is where to make the change */
  60                location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
  61                        + rel[i].r_offset;
  62                /* This is the symbol it is referring to.  Note that all
  63                   undefined symbols have been resolved.  */
  64                sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
  65                        + ELF32_R_SYM(rel[i].r_info);
  66
  67                switch (ELF32_R_TYPE(rel[i].r_info)) {
  68                case R_68K_32:
  69                        /* We add the value into the location given */
  70                        *location += sym->st_value;
  71                        break;
  72                case R_68K_PC32:
  73                        /* Add the value, subtract its postition */
  74                        *location += sym->st_value - (uint32_t)location;
  75                        break;
  76                default:
  77                        printk(KERN_ERR "module %s: Unknown relocation: %u\n",
  78                               me->name, ELF32_R_TYPE(rel[i].r_info));
  79                        return -ENOEXEC;
  80                }
  81        }
  82        return 0;
  83}
  84
  85int apply_relocate_add(Elf32_Shdr *sechdrs,
  86                       const char *strtab,
  87                       unsigned int symindex,
  88                       unsigned int relsec,
  89                       struct module *me)
  90{
  91        unsigned int i;
  92        Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr;
  93        Elf32_Sym *sym;
  94        uint32_t *location;
  95
  96        DEBUGP("Applying relocate_add section %u to %u\n", relsec,
  97               sechdrs[relsec].sh_info);
  98        for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
  99                /* This is where to make the change */
 100                location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
 101                        + rel[i].r_offset;
 102                /* This is the symbol it is referring to.  Note that all
 103                   undefined symbols have been resolved.  */
 104                sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
 105                        + ELF32_R_SYM(rel[i].r_info);
 106
 107                switch (ELF32_R_TYPE(rel[i].r_info)) {
 108                case R_68K_32:
 109                        /* We add the value into the location given */
 110                        *location = rel[i].r_addend + sym->st_value;
 111                        break;
 112                case R_68K_PC32:
 113                        /* Add the value, subtract its postition */
 114                        *location = rel[i].r_addend + sym->st_value - (uint32_t)location;
 115                        break;
 116                default:
 117                        printk(KERN_ERR "module %s: Unknown relocation: %u\n",
 118                               me->name, ELF32_R_TYPE(rel[i].r_info));
 119                        return -ENOEXEC;
 120                }
 121        }
 122        return 0;
 123}
 124
 125int module_finalize(const Elf_Ehdr *hdr,
 126                    const Elf_Shdr *sechdrs,
 127                    struct module *mod)
 128{
 129        module_fixup(mod, mod->arch.fixup_start, mod->arch.fixup_end);
 130
 131        return 0;
 132}
 133
 134void module_arch_cleanup(struct module *mod)
 135{
 136}
 137
 138#endif /* CONFIG_MODULES */
 139
 140void module_fixup(struct module *mod, struct m68k_fixup_info *start,
 141                  struct m68k_fixup_info *end)
 142{
 143        struct m68k_fixup_info *fixup;
 144
 145        for (fixup = start; fixup < end; fixup++) {
 146                switch (fixup->type) {
 147                case m68k_fixup_memoffset:
 148                        *(u32 *)fixup->addr = m68k_memoffset;
 149                        break;
 150                case m68k_fixup_vnode_shift:
 151                        *(u16 *)fixup->addr += m68k_virt_to_node_shift;
 152                        break;
 153                }
 154        }
 155}
 156