release/src-rt-6.x.4708/linux/linux-2.6.36/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 #define DEBUGP(fmt...)
  15
  16 #ifdef CONFIG_MODULES
  17
  18 void *module_alloc(unsigned long size)
  19 {
  20         if (size == 0)
  21                 return NULL;
  22         return vmalloc(size);
  23 }
  24
  25
  26 /* Free memory returned from module_alloc */
  27 void module_free(struct module *mod, void *module_region)
  28 {
  29         vfree(module_region);
  30 }
  31
  32 /* We don't need anything special. */
  33 int module_frob_arch_sections(Elf_Ehdr *hdr,
  34                               Elf_Shdr *sechdrs,
  35                               char *secstrings,
  36                               struct module *mod)
  37 {
  38         return 0;
  39 }
  40
  41 int apply_relocate(Elf32_Shdr *sechdrs,
  42                    const char *strtab,
  43                    unsigned int symindex,
  44                    unsigned int relsec,
  45                    struct module *me)
  46 {
  47         unsigned int i;
  48         Elf32_Rel *rel = (void *)sechdrs[relsec].sh_addr;
  49         Elf32_Sym *sym;
  50         uint32_t *location;
  51
  52         DEBUGP("Applying relocate section %u to %u\n", relsec,
  53                sechdrs[relsec].sh_info);
  54         for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
  55                 /* This is where to make the change */
  56                 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
  57                         + rel[i].r_offset;
  58                 /* This is the symbol it is referring to.  Note that all
  59                    undefined symbols have been resolved.  */
  60                 sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
  61                         + ELF32_R_SYM(rel[i].r_info);
  62
  63                 switch (ELF32_R_TYPE(rel[i].r_info)) {
  64                 case R_68K_32:
  65                         /* We add the value into the location given */
  66                         *location += sym->st_value;
  67                         break;
  68                 case R_68K_PC32:
  69                         /* Add the value, subtract its postition */
  70                         *location += sym->st_value - (uint32_t)location;
  71                         break;
  72                 default:
  73                         printk(KERN_ERR "module %s: Unknown relocation: %u\n",
  74                                me->name, ELF32_R_TYPE(rel[i].r_info));
  75                         return -ENOEXEC;
  76                 }
  77         }
  78         return 0;
  79 }
  80
  81 int apply_relocate_add(Elf32_Shdr *sechdrs,
  82                        const char *strtab,
  83                        unsigned int symindex,
  84                        unsigned int relsec,
  85                        struct module *me)
  86 {
  87         unsigned int i;
  88         Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr;
  89         Elf32_Sym *sym;
  90         uint32_t *location;
  91
  92         DEBUGP("Applying relocate_add section %u to %u\n", relsec,
  93                sechdrs[relsec].sh_info);
  94         for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
  95                 /* This is where to make the change */
  96                 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
  97                         + rel[i].r_offset;
  98                 /* This is the symbol it is referring to.  Note that all
  99                    undefined symbols have been resolved.  */
 100                 sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
 101                         + ELF32_R_SYM(rel[i].r_info);
 102
 103                 switch (ELF32_R_TYPE(rel[i].r_info)) {
 104                 case R_68K_32:
 105                         /* We add the value into the location given */
 106                         *location = rel[i].r_addend + sym->st_value;
 107                         break;
 108                 case R_68K_PC32:
 109                         /* Add the value, subtract its postition */
 110                         *location = rel[i].r_addend + sym->st_value - (uint32_t)location;
 111                         break;
 112                 default:
 113                         printk(KERN_ERR "module %s: Unknown relocation: %u\n",
 114                                me->name, ELF32_R_TYPE(rel[i].r_info));
 115                         return -ENOEXEC;
 116                 }
 117         }
 118         return 0;
 119 }
 120
 121 int module_finalize(const Elf_Ehdr *hdr,
 122                     const Elf_Shdr *sechdrs,
 123                     struct module *mod)
 124 {
 125         module_fixup(mod, mod->arch.fixup_start, mod->arch.fixup_end);
 126
 127         return 0;
 128 }
 129
 130 void module_arch_cleanup(struct module *mod)
 131 {
 132 }
 133
 134 #endif /* CONFIG_MODULES */
 135
 136 void module_fixup(struct module *mod, struct m68k_fixup_info *start,
 137                   struct m68k_fixup_info *end)
 138 {
 139         struct m68k_fixup_info *fixup;
 140
 141         for (fixup = start; fixup < end; fixup++) {
 142                 switch (fixup->type) {
 143                 case m68k_fixup_memoffset:
 144                         *(u32 *)fixup->addr = m68k_memoffset;
 145                         break;
 146                 case m68k_fixup_vnode_shift:
 147                         *(u16 *)fixup->addr += m68k_virt_to_node_shift;
 148                         break;
 149                 }
 150         }
 151 }