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Annotation of prex-old/usr/arch/arm/elf_reloc.c, Revision 1.1

1.1     ! nbrk        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>
        !            31:
        !            32: int
        !            33: relocate_rel(Elf32_Rel *rel, Elf32_Addr sym_val, char *target_sect)
        !            34: {
        !            35:        Elf32_Addr *where, tmp;
        !            36:        Elf32_Sword addend;
        !            37:
        !            38:        where = (Elf32_Addr *)(target_sect + rel->r_offset);
        !            39:
        !            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:                /* dbg("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:
        !            51:                addend = *where & 0x00ffffff;
        !            52:                if (addend & 0x00800000)
        !            53:                        addend |= 0xff000000;
        !            54:                tmp = sym_val - (Elf32_Addr)where + (addend << 2);
        !            55:                tmp >>= 2;
        !            56:                *where = (*where & 0xff000000) | (tmp & 0x00ffffff);
        !            57:                /* dbg("R_ARM_PC24: %x -> %x\n", where, *where); */
        !            58:                break;
        !            59:        default:
        !            60:                syslog(LOG_INFO, "relocation fail type=%d\n", ELF32_R_TYPE(rel->r_info));
        !            61:                return -1;
        !            62:        }
        !            63:        return 0;
        !            64: }
        !            65:
        !            66: int
        !            67: relocate_rela(Elf32_Rela *rela, Elf32_Addr sym_val, char *target_sec)
        !            68: {
        !            69:        /* dbg("Invalid relocation type\n"); */
        !            70:        return -1;
        !            71: }