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root/usr/arch/arm/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  */
  29 #include <sys/elf.h>
  30 #include <sys/syslog.h>
  32 int
relocate_rel(Elf32_Rel *rel, Elf32_Addr sym_val, char *target_sect)
  34 {
Elf32_Addr *where, tmp;
Elf32_Sword addend;
where = (Elf32_Addr *)(target_sect + rel->r_offset);
  40         switch (ELF32_R_TYPE(rel->r_info)) {
  41         case R_ARM_NONE:
  42                 break;
  43         case R_ARM_ABS32:
  44                 *where += (Elf32_Addr)sym_val;
  45                 /* printf("R_ARM_ABS32: %x -> %x\n", where, *where); */
  46                 break;
  47         case R_ARM_PC24:
  48         case R_ARM_PLT32:
  49         case R_ARM_CALL:
  50         case R_ARM_JUMP24:
addend = *where & 0x00ffffff;
  52                 if (addend & 0x00800000)
addend |= 0xff000000;
tmp = sym_val - (Elf32_Addr)where + (addend << 2);
tmp >>= 2;
  56                 *where = (*where & 0xff000000) | (tmp & 0x00ffffff);
  57                 /* printf("R_ARM_PC24: %x -> %x\n", where, *where); */
  58                 break;
  59         default:
  60 #ifdef DEBUG
syslog(LOG_ERR, "relocation fail type=%d\n", ELF32_R_TYPE(rel->r_info));
  62 #endif
  63                 return -1;
  64         }
  65         return 0;
  66 }
  68 int
relocate_rela(Elf32_Rela *rela, Elf32_Addr sym_val, char *target_sec)
  70 {
  71         /* printf("Invalid relocation type\n"); */
  72         return -1;
  73 }