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root / prex-0.9.0 / bsp / boot / ppc / arch / elf_reloc.c @ 03e9c04a

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/*-
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 * Copyright (c) 2009, Kohsuke Ohtani
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
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 *    documentation and/or other materials provided with the distribution.
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 * 3. Neither the name of the author nor the names of any co-contributors
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 *    may be used to endorse or promote products derived from this software
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 *    without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 * SUCH DAMAGE.
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 */
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#include <sys/param.h>
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#include <sys/elf.h>
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#include <boot.h>
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int
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relocate_rel(Elf32_Rel *rel, Elf32_Addr sym_val, char *target_sec)
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{
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        panic("invalid relocation type");
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        return -1;
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}
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int
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relocate_rela(Elf32_Rela *rela, Elf32_Addr sym_val, char *target_sect)
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{
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        Elf32_Addr *where;
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        uint32_t val;
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        where = (Elf32_Addr *)(target_sect + rela->r_offset);
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        val = sym_val + rela->r_addend;
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        switch (ELF32_R_TYPE(rela->r_info)) {
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        case R_PPC_NONE:
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                break;
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        case R_PPC_ADDR32:
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                ELFDBG(("R_PPC_ADDR32\n"));
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                *(uint32_t *)where = val;
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                break;
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        case R_PPC_ADDR16_LO:
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                ELFDBG(("R_PPC_ADDR16_LO\n"));
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                *(uint16_t *)where = (uint16_t)val;
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                break;
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        case R_PPC_ADDR16_HI:
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                ELFDBG(("R_PPC_ADDR16_HI\n"));
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                *(uint16_t *)where = (uint16_t)(val >> 16);
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                break;
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        case R_PPC_ADDR16_HA:
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                ELFDBG(("R_PPC_ADDR16_HA\n"));
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                *(uint16_t *)where = (uint16_t)((val + 0x8000) >> 16);
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                break;
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        case R_PPC_REL24:
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                ELFDBG(("R_PPC_REL24\n"));
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                *(uint32_t *)where =
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                        (*(uint32_t *)where & ~0x03fffffc)
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                        | ((val - (uint32_t)where)
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                           & 0x03fffffc);
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                break;
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        case R_PPC_REL32:
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                ELFDBG(("R_PPC_REL32\n"));
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                *(uint32_t *)where = val - (uint32_t)where;
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                break;
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        default:
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                ELFDBG(("Unkown relocation type=%d\n",
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                        ELF32_R_TYPE(rela->r_info)));
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                panic("relocation fail");
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                return -1;
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        }
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        return 0;
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}