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
  22 void *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 */
  31 void module_free(struct module *mod, void *module_region)
  32 {
  33         vfree(module_region);
  34 }
  35
  36 /* We don't need anything special. */
  37 int module_frob_arch_sections(Elf_Ehdr *hdr,
  38                               Elf_Shdr *sechdrs,
  39                               char *secstrings,
  40                               struct module *mod)
  41 {
  42         return 0;
  43 }
  44
  45 int 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
  85 int 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
 125 int 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         return 0;
 131 }
 132
 133 void module_arch_cleanup(struct module *mod)
 134 {
 135 }
 136
 137 #endif /* CONFIG_MODULES */
 138
 139 void module_fixup(struct module *mod, struct m68k_fixup_info *start,
 140                   struct m68k_fixup_info *end)
 141 {
 142 #ifdef CONFIG_MMU
 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 #endif
 156 }