LXR linux/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
  30int apply_relocate(Elf_Shdr *sechdrs, const char *strtab,
  31                unsigned int symindex, unsigned int relindex,
  32                struct module *me)
  33{
  34        Elf32_Shdr *symsec = sechdrs + symindex;
  35        Elf32_Shdr *relsec = sechdrs + relindex;
  36        Elf32_Shdr *dstsec = sechdrs + relsec->sh_info;
  37        Elf32_Rel *rel = (void *)relsec->sh_addr;
  38        unsigned int i;
  39
  40        for (i = 0; i < relsec->sh_size / sizeof(Elf32_Rel); i++, rel++) {
  41                unsigned long loc;
  42                Elf32_Sym *sym;
  43                s32 r_offset;
  44
  45                r_offset = ELF32_R_SYM(rel->r_info);
  46                if ((r_offset < 0) ||
  47                    (r_offset > (symsec->sh_size / sizeof(Elf32_Sym)))) {
  48                        printk(KERN_ERR "%s: bad relocation, section %d reloc %d\n",
  49                                me->name, relindex, i);
  50                                return -ENOEXEC;
  51                }
  52
  53                sym = ((Elf32_Sym *)symsec->sh_addr) + r_offset;
  54
  55                if ((rel->r_offset < 0) ||
  56                    (rel->r_offset > dstsec->sh_size - sizeof(u32))) {
  57                        printk(KERN_ERR "%s: out of bounds relocation, "
  58                                "section %d reloc %d offset %d size %d\n",
  59                                me->name, relindex, i, rel->r_offset,
  60                                dstsec->sh_size);
  61                        return -ENOEXEC;
  62                }
  63
  64                loc = dstsec->sh_addr + rel->r_offset;
  65                switch (ELF32_R_TYPE(rel->r_info)) {
  66                case R_SCORE_NONE:
  67                        break;
  68                case R_SCORE_ABS32:
  69                        *(unsigned long *)loc += sym->st_value;
  70                        break;
  71                case R_SCORE_HI16:
  72                        break;
  73                case R_SCORE_LO16: {
  74                        unsigned long hi16_offset, offset;
  75                        unsigned long uvalue;
  76                        unsigned long temp, temp_hi;
  77                        temp_hi = *((unsigned long *)loc - 1);
  78                        temp = *(unsigned long *)loc;
  79
  80                        hi16_offset = (((((temp_hi) >> 16) & 0x3) << 15) |
  81                                        ((temp_hi) & 0x7fff)) >> 1;
  82                        offset = ((temp >> 16 & 0x03) << 15) |
  83                                        ((temp & 0x7fff) >> 1);
  84                        offset = (hi16_offset << 16) | (offset & 0xffff);
  85                        uvalue = sym->st_value + offset;
  86                        hi16_offset = (uvalue >> 16) << 1;
  87
  88                        temp_hi = ((temp_hi) & (~(0x37fff))) |
  89                                        (hi16_offset & 0x7fff) |
  90                                        ((hi16_offset << 1) & 0x30000);
  91                        *((unsigned long *)loc - 1) = temp_hi;
  92
  93                        offset = (uvalue & 0xffff) << 1;
  94                        temp = (temp & (~(0x37fff))) | (offset & 0x7fff) |
  95                                ((offset << 1) & 0x30000);
  96                        *(unsigned long *)loc = temp;
  97                        break;
  98                }
  99                case R_SCORE_24: {
 100                        unsigned long hi16_offset, offset;
 101                        unsigned long uvalue;
 102                        unsigned long temp;
 103
 104                        temp = *(unsigned long *)loc;
 105                        offset = (temp & 0x03FF7FFE);
 106                        hi16_offset = (offset & 0xFFFF0000);
 107                        offset = (hi16_offset | ((offset & 0xFFFF) << 1)) >> 2;
 108
 109                        uvalue = (sym->st_value + offset) >> 1;
 110                        uvalue = uvalue & 0x00ffffff;
 111
 112                        temp = (temp & 0xfc008001) |
 113                                ((uvalue << 2) & 0x3ff0000) |
 114                                ((uvalue & 0x3fff) << 1);
 115                        *(unsigned long *)loc = temp;
 116                        break;
 117                }
 118                default:
 119                        printk(KERN_ERR "%s: unknown relocation: %u\n",
 120                                me->name, ELF32_R_TYPE(rel->r_info));
 121                        return -ENOEXEC;
 122                }
 123        }
 124
 125        return 0;
 126}
 127
 128/* Given an address, look for it in the module exception tables. */
 129const struct exception_table_entry *search_module_dbetables(unsigned long addr)
 130{
 131        return NULL;
 132}
 133