arch/score/kernel/module.c

   1 /*
   2  * arch/score/kernel/module.c
   3  *
   4  * Score Processor version.
   5  *
   6  * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
   7  *  Chen Liqin <liqin.chen@sunplusct.com>
   8  *  Lennox Wu <lennox.wu@sunplusct.com>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, see the file COPYING, or write
  22  * to the Free Software Foundation, Inc.,
  23  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  24  */
  25
  26 #include <linux/moduleloader.h>
  27 #include <linux/module.h>
  28 #include <linux/vmalloc.h>
  29
  30 void *module_alloc(unsigned long size)
  31 {
  32         return size ? vmalloc(size) : NULL;
  33 }
  34
  35 /* Free memory returned from module_alloc */
  36 void module_free(struct module *mod, void *module_region)
  37 {
  38         vfree(module_region);
  39 }
  40
  41 int module_frob_arch_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs,
  42                         char *secstrings, struct module *mod)
  43 {
  44         return 0;
  45 }
  46
  47 int apply_relocate(Elf_Shdr *sechdrs, const char *strtab,
  48                 unsigned int symindex, unsigned int relindex,
  49                 struct module *me)
  50 {
  51         Elf32_Shdr *symsec = sechdrs + symindex;
  52         Elf32_Shdr *relsec = sechdrs + relindex;
  53         Elf32_Shdr *dstsec = sechdrs + relsec->sh_info;
  54         Elf32_Rel *rel = (void *)relsec->sh_addr;
  55         unsigned int i;
  56
  57         for (i = 0; i < relsec->sh_size / sizeof(Elf32_Rel); i++, rel++) {
  58                 unsigned long loc;
  59                 Elf32_Sym *sym;
  60                 s32 r_offset;
  61
  62                 r_offset = ELF32_R_SYM(rel->r_info);
  63                 if ((r_offset < 0) ||
  64                     (r_offset > (symsec->sh_size / sizeof(Elf32_Sym)))) {
  65                         printk(KERN_ERR "%s: bad relocation, section %d reloc %d\n",
  66                                 me->name, relindex, i);
  67                                 return -ENOEXEC;
  68                 }
  69
  70                 sym = ((Elf32_Sym *)symsec->sh_addr) + r_offset;
  71
  72                 if ((rel->r_offset < 0) ||
  73                     (rel->r_offset > dstsec->sh_size - sizeof(u32))) {
  74                         printk(KERN_ERR "%s: out of bounds relocation, "
  75                                 "section %d reloc %d offset %d size %d\n",
  76                                 me->name, relindex, i, rel->r_offset,
  77                                 dstsec->sh_size);
  78                         return -ENOEXEC;
  79                 }
  80
  81                 loc = dstsec->sh_addr + rel->r_offset;
  82                 switch (ELF32_R_TYPE(rel->r_info)) {
  83                 case R_SCORE_NONE:
  84                         break;
  85                 case R_SCORE_ABS32:
  86                         *(unsigned long *)loc += sym->st_value;
  87                         break;
  88                 case R_SCORE_HI16:
  89                         break;
  90                 case R_SCORE_LO16: {
  91                         unsigned long hi16_offset, offset;
  92                         unsigned long uvalue;
  93                         unsigned long temp, temp_hi;
  94                         temp_hi = *((unsigned long *)loc - 1);
  95                         temp = *(unsigned long *)loc;
  96
  97                         hi16_offset = (((((temp_hi) >> 16) & 0x3) << 15) |
  98                                         ((temp_hi) & 0x7fff)) >> 1;
  99                         offset = ((temp >> 16 & 0x03) << 15) |
 100                                         ((temp & 0x7fff) >> 1);
 101                         offset = (hi16_offset << 16) | (offset & 0xffff);
 102                         uvalue = sym->st_value + offset;
 103                         hi16_offset = (uvalue >> 16) << 1;
 104
 105                         temp_hi = ((temp_hi) & (~(0x37fff))) |
 106                                         (hi16_offset & 0x7fff) |
 107                                         ((hi16_offset << 1) & 0x30000);
 108                         *((unsigned long *)loc - 1) = temp_hi;
 109
 110                         offset = (uvalue & 0xffff) << 1;
 111                         temp = (temp & (~(0x37fff))) | (offset & 0x7fff) |
 112                                 ((offset << 1) & 0x30000);
 113                         *(unsigned long *)loc = temp;
 114                         break;
 115                 }
 116                 case R_SCORE_24: {
 117                         unsigned long hi16_offset, offset;
 118                         unsigned long uvalue;
 119                         unsigned long temp;
 120
 121                         temp = *(unsigned long *)loc;
 122                         offset = (temp & 0x03FF7FFE);
 123                         hi16_offset = (offset & 0xFFFF0000);
 124                         offset = (hi16_offset | ((offset & 0xFFFF) << 1)) >> 2;
 125
 126                         uvalue = (sym->st_value + offset) >> 1;
 127                         uvalue = uvalue & 0x00ffffff;
 128
 129                         temp = (temp & 0xfc008001) |
 130                                 ((uvalue << 2) & 0x3ff0000) |
 131                                 ((uvalue & 0x3fff) << 1);
 132                         *(unsigned long *)loc = temp;
 133                         break;
 134                 }
 135                 default:
 136                         printk(KERN_ERR "%s: unknown relocation: %u\n",
 137                                 me->name, ELF32_R_TYPE(rel->r_info));
 138                         return -ENOEXEC;
 139                 }
 140         }
 141
 142         return 0;
 143 }
 144
 145 int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab,
 146                 unsigned int symindex, unsigned int relsec,
 147                 struct module *me)
 148 {
 149         return 0;
 150 }
 151
 152 /* Given an address, look for it in the module exception tables. */
 153 const struct exception_table_entry *search_module_dbetables(unsigned long addr)
 154 {
 155         return NULL;
 156 }
 157
 158 /* Put in dbe list if necessary. */
 159 int module_finalize(const Elf_Ehdr *hdr, const Elf_Shdr *sechdrs,
 160                 struct module *me)
 161 {
 162         return 0;
 163 }
 164
 165 void module_arch_cleanup(struct module *mod) {}