elfreloc_amd64.c

/* Copyright © 2014, Owen Shepherd
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
 * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */

#include "elfload.h"

#if defined(__amd64__)

#define R_AMD64_NONE     0
#define R_AMD64_RELATIVE 8

el_status el_applyrela(el_ctx *ctx, Elf_RelA *rel)
{
    uint64_t *p = (uint64_t*) (rel->r_offset + ctx->base_load_vaddr);
    uint32_t type = ELF_R_TYPE(rel->r_info);

    switch (type) {
        case R_AMD64_NONE: break;
        case R_AMD64_RELATIVE:
            EL_DEBUG("Applying R_AMD64_RELATIVE reloc @%p\n", p);
            *p = rel->r_addend + ctx->base_load_vaddr;
            break;
        default:
            EL_DEBUG("Bad relocation %u\n", type);
            return EL_BADREL;

    }

    return EL_OK;
}

#endif