linux/arch/m68k/kernel/module.c
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   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        /* FIXME: If module_region == mod->init_region, trim exception
  35           table entries. */
  36}
  37
  38/* We don't need anything special. */
  39int module_frob_arch_sections(Elf_Ehdr *hdr,
  40                              Elf_Shdr *sechdrs,
  41                              char *secstrings,
  42                              struct module *mod)
  43{
  44        return 0;
  45}
  46
  47int apply_relocate(Elf32_Shdr *sechdrs,
  48                   const char *strtab,
  49                   unsigned int symindex,
  50                   unsigned int relsec,
  51                   struct module *me)
  52{
  53        unsigned int i;
  54        Elf32_Rel *rel = (void *)sechdrs[relsec].sh_addr;
  55        Elf32_Sym *sym;
  56        uint32_t *location;
  57
  58        DEBUGP("Applying relocate section %u to %u\n", relsec,
  59               sechdrs[relsec].sh_info);
  60        for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
  61                /* This is where to make the change */
  62                location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
  63                        + rel[i].r_offset;
  64                /* This is the symbol it is referring to.  Note that all
  65                   undefined symbols have been resolved.  */
  66                sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
  67                        + ELF32_R_SYM(rel[i].r_info);
  68
  69                switch (ELF32_R_TYPE(rel[i].r_info)) {
  70                case R_68K_32:
  71                        /* We add the value into the location given */
  72                        *location += sym->st_value;
  73                        break;
  74                case R_68K_PC32:
  75                        /* Add the value, subtract its postition */
  76                        *location += sym->st_value - (uint32_t)location;
  77                        break;
  78                default:
  79                        printk(KERN_ERR "module %s: Unknown relocation: %u\n",
  80                               me->name, ELF32_R_TYPE(rel[i].r_info));
  81                        return -ENOEXEC;
  82                }
  83        }
  84        return 0;
  85}
  86
  87int apply_relocate_add(Elf32_Shdr *sechdrs,
  88                       const char *strtab,
  89                       unsigned int symindex,
  90                       unsigned int relsec,
  91                       struct module *me)
  92{
  93        unsigned int i;
  94        Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr;
  95        Elf32_Sym *sym;
  96        uint32_t *location;
  97
  98        DEBUGP("Applying relocate_add section %u to %u\n", relsec,
  99               sechdrs[relsec].sh_info);
 100        for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
 101                /* This is where to make the change */
 102                location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
 103                        + rel[i].r_offset;
 104                /* This is the symbol it is referring to.  Note that all
 105                   undefined symbols have been resolved.  */
 106                sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
 107                        + ELF32_R_SYM(rel[i].r_info);
 108
 109                switch (ELF32_R_TYPE(rel[i].r_info)) {
 110                case R_68K_32:
 111                        /* We add the value into the location given */
 112                        *location = rel[i].r_addend + sym->st_value;
 113                        break;
 114                case R_68K_PC32:
 115                        /* Add the value, subtract its postition */
 116                        *location = rel[i].r_addend + sym->st_value - (uint32_t)location;
 117                        break;
 118                default:
 119                        printk(KERN_ERR "module %s: Unknown relocation: %u\n",
 120                               me->name, ELF32_R_TYPE(rel[i].r_info));
 121                        return -ENOEXEC;
 122                }
 123        }
 124        return 0;
 125}
 126
 127int module_finalize(const Elf_Ehdr *hdr,
 128                    const Elf_Shdr *sechdrs,
 129                    struct module *mod)
 130{
 131        module_fixup(mod, mod->arch.fixup_start, mod->arch.fixup_end);
 132
 133        return 0;
 134}
 135
 136void module_arch_cleanup(struct module *mod)
 137{
 138}
 139
 140#endif /* CONFIG_MODULES */
 141
 142void module_fixup(struct module *mod, struct m68k_fixup_info *start,
 143                  struct m68k_fixup_info *end)
 144{
 145        struct m68k_fixup_info *fixup;
 146
 147        for (fixup = start; fixup < end; fixup++) {
 148                switch (fixup->type) {
 149                case m68k_fixup_memoffset:
 150                        *(u32 *)fixup->addr = m68k_memoffset;
 151                        break;
 152                case m68k_fixup_vnode_shift:
 153                        *(u16 *)fixup->addr += m68k_virt_to_node_shift;
 154                        break;
 155                }
 156        }
 157}
 158
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