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scoutos / prex-0.9.0 / usr / arch / arm / elf_reloc.c @ 03e9c04a

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/*-
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 * Copyright (c) 2006, 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/elf.h>
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#include <sys/syslog.h>
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int
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relocate_rel(Elf32_Rel *rel, Elf32_Addr sym_val, char *target_sect)
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{
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        Elf32_Addr *where, tmp;
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        Elf32_Sword addend;
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        where = (Elf32_Addr *)(target_sect + rel->r_offset);
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        switch (ELF32_R_TYPE(rel->r_info)) {
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        case R_ARM_NONE:
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                break;
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        case R_ARM_ABS32:
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                *where += (Elf32_Addr)sym_val;
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                /* printf("R_ARM_ABS32: %x -> %x\n", where, *where); */
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                break;
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        case R_ARM_PC24:
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        case R_ARM_PLT32:
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        case R_ARM_CALL:
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        case R_ARM_JUMP24:
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                addend = *where & 0x00ffffff;
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                if (addend & 0x00800000)
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                        addend |= 0xff000000;
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                tmp = sym_val - (Elf32_Addr)where + (addend << 2);
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                tmp >>= 2;
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                *where = (*where & 0xff000000) | (tmp & 0x00ffffff);
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                /* printf("R_ARM_PC24: %x -> %x\n", where, *where); */
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                break;
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        default:
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#ifdef DEBUG
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                syslog(LOG_ERR, "relocation fail type=%d\n", ELF32_R_TYPE(rel->r_info));
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#endif
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                return -1;
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        }
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        return 0;
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}
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int
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relocate_rela(Elf32_Rela *rela, Elf32_Addr sym_val, char *target_sec)
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{
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        /* printf("Invalid relocation type\n"); */
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        return -1;
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}