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/*-
 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
 *
 * Copyright (c) 2003 Jake Burkholder.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * $FreeBSD$
 */

#include <sys/types.h>
#include <machine/elf.h>

#include <err.h>
#include <string.h>

#include "ef.h"

/*
 * Apply relocations to the values we got from the file. `relbase' is the
 * target relocation address of the section, and `dataoff' is the target
 * relocation address of the data in `dest'.
 */
int
ef_reloc(struct elf_file *ef, const void *reldata, int reltype, Elf_Off relbase,
    Elf_Off dataoff, size_t len, void *dest)
{
	const Elf_Rela *a;
	Elf_Size w;

	switch (reltype) {
	case EF_RELOC_RELA:
		a = reldata;
		if (relbase + a->r_offset >= dataoff && relbase + a->r_offset <
		    dataoff + len) {
			switch (ELF_R_TYPE(a->r_info)) {
			case R_SPARC_RELATIVE:
				w = a->r_addend + relbase;
				memcpy((u_char *)dest + (relbase + a->r_offset -
				    dataoff), &w, sizeof(w));
				break;
			default:
				warnx("unhandled relocation type %u",
				    (unsigned int)ELF_R_TYPE(a->r_info));
				break;
			}
		}
		break;
	}
	return (0);
}