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
  30void *module_alloc(unsigned long size)
  31{
  32        return size ? vmalloc(size) : NULL;
  33}
  34
  35/* Free memory returned from module_alloc */
  36void module_free(struct module *mod, void *module_region)
  37{
  38        vfree(module_region);
  39}
  40
  41int module_frob_arch_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs,
  42                        char *secstrings, struct module *mod)
  43{
  44        return 0;
  45}
  46
  47int 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
 145int 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. */
 153const struct exception_table_entry *search_module_dbetables(unsigned long addr)
 154{
 155        return NULL;
 156}
 157
 158/* Put in dbe list if necessary. */
 159int module_finalize(const Elf_Ehdr *hdr, const Elf_Shdr *sechdrs,
 160                struct module *me)
 161{
 162        return 0;
 163}
 164
 165void module_arch_cleanup(struct module *mod) {}
 166