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root/bsp/boot/arm/arch/elf_reloc.c

DEFINITIONS

1. relocate_rel
2. relocate_rela

   1 /*-
   2  * Copyright (c) 2006, Kohsuke Ohtani
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the author nor the names of any co-contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  30 #include <sys/param.h>
  31 #include <sys/elf.h>
  32 #include <boot.h>
  34 int
relocate_rel(Elf32_Rel *rel, Elf32_Addr sym_val, char *target_sect)
  36 {
Elf32_Addr *where, tmp;
Elf32_Sword addend;
where = (Elf32_Addr *)(target_sect + rel->r_offset);
  42         switch (ELF32_R_TYPE(rel->r_info)) {
  43         case R_ARM_NONE:
  44                 break;
  45         case R_ARM_ABS32:
  46                 *where += (vaddr_t)ptokv(sym_val);
ELFDBG(("R_ARM_ABS32: %lx -> %lx\n",
  48                         (long)where, (long)*where));
  49                 break;
  50         case R_ARM_PC24:
  51         case R_ARM_PLT32:
  52         case R_ARM_CALL:
  53         case R_ARM_JUMP24:
addend = (Elf32_Sword)(*where & 0x00ffffff);
  55                 if (addend & 0x00800000)
addend |= 0xff000000;
tmp = sym_val - (Elf32_Addr)where + (addend << 2);
tmp >>= 2;
  59                 *where = (*where & 0xff000000) | (tmp & 0x00ffffff);
ELFDBG(("R_ARM_PC24: %lx -> %lx\n",
  61                         (long)where, (long)*where));
  62                 break;
  63         default:
ELFDBG(("Unkown relocation type=%d\n",
ELF32_R_TYPE(rel->r_info)));
panic("relocation fail");
  67                 return -1;
  68         }
  69         return 0;
  70 }
  72 int
relocate_rela(Elf32_Rela *rela, Elf32_Addr sym_val, char *target_sec)
  74 {
panic("invalid relocation type");
  77         return -1;
  78 }