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

DEFINITIONS

1. relocate_rel
2. relocate_rela

   1 /*-
   2  * Copyright (c) 2009, 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_sec)
  36 {
panic("invalid relocation type");
  39         return -1;
  40 }
  42 int
relocate_rela(Elf32_Rela *rela, Elf32_Addr sym_val, char *target_sect)
  44 {
Elf32_Addr *where;
uint32_t val;
where = (Elf32_Addr *)(target_sect + rela->r_offset);
val = sym_val + rela->r_addend;
  51         switch (ELF32_R_TYPE(rela->r_info)) {
  52         case R_PPC_NONE:
  53                 break;
  54         case R_PPC_ADDR32:
ELFDBG(("R_PPC_ADDR32\n"));
  56                 *(uint32_t *)where = val;
  57                 break;
  58         case R_PPC_ADDR16_LO:
ELFDBG(("R_PPC_ADDR16_LO\n"));
  60                 *(uint16_t *)where = (uint16_t)val;
  61                 break;
  62         case R_PPC_ADDR16_HI:
ELFDBG(("R_PPC_ADDR16_HI\n"));
  64                 *(uint16_t *)where = (uint16_t)(val >> 16);
  65                 break;
  66         case R_PPC_ADDR16_HA:
ELFDBG(("R_PPC_ADDR16_HA\n"));
  68                 *(uint16_t *)where = (uint16_t)((val + 0x8000) >> 16);
  69                 break;
  70         case R_PPC_REL24:
ELFDBG(("R_PPC_REL24\n"));
  72                 *(uint32_t *)where =
  73                         (*(uint32_t *)where & ~0x03fffffc)
  74                         | ((val - (uint32_t)where)
  75                            & 0x03fffffc);
  76                 break;
  77         case R_PPC_REL32:
ELFDBG(("R_PPC_REL32\n"));
  79                 *(uint32_t *)where = val - (uint32_t)where;
  80                 break;
  81         default:
ELFDBG(("Unkown relocation type=%d\n",
ELF32_R_TYPE(rela->r_info)));
panic("relocation fail");
  85                 return -1;
  86         }
  87         return 0;
  88 }