/*      $NetBSD: kobj_machdep.c,v 1.6 2023/04/29 10:01:51 skrll Exp $   */

/*-
 * Copyright (c) 2008 The NetBSD Foundation, Inc.
 * 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: kobj_machdep.c,v 1.6 2023/04/29 10:01:51 skrll Exp $");

#define ELFSIZE         ARCH_ELFSIZE

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kobj.h>
#include <sys/exec.h>
#include <sys/exec_elf.h>

int
kobj_reloc(kobj_t ko, uintptr_t relocbase, const void *data,
           bool isrela, bool local)
{
        Elf_Addr *where;
        uintptr_t addr, tmp;
        int rtype, symnum;
        const Elf_Rela *rela;
        int error;

        if (!isrela) {
                printf("kobj_reloc: support only RELA relocations\n");
                return -1;
        }

        rela = data;
        where = (Elf_Addr *)(relocbase + rela->r_offset);
        symnum = ELF_R_SYM(rela->r_info);
        rtype = ELF_R_TYPE(rela->r_info);

        const Elf_Sym *sym = kobj_symbol(ko, symnum);

        if (!local && ELF_ST_BIND(sym->st_info) == STB_LOCAL) {
                return 0;
        }

        switch (rtype) {
        case R_TYPE(NONE):
                break;

        case R_TYPE(PC32):
                error = kobj_sym_lookup(ko, symnum, &addr);
                if (error)
                        return -1;
                tmp = (Elf_Addr)(addr + rela->r_addend) - (Elf_Addr)where;
                if (*where != tmp)
                        *where = tmp;
                break;

        case R_TYPE(32):
        case R_TYPE(GLOB_DAT):
                error = kobj_sym_lookup(ko, symnum, &addr);
                if (error)
                        return -1;
                tmp = (Elf_Addr)(addr + *where + rela->r_addend);
                *where = tmp;
                break;

        case R_TYPE(RELATIVE):
                *where += (Elf_Addr)(relocbase + rela->r_addend);
                break;

        default:
                printf("kobj_reloc: unexpected relocation type %d\n",
                    (int)rtype);
                return -1;
        }

        return 0;
}

int
kobj_machdep(kobj_t ko, void *base, size_t size, bool load)
{

        return 0;
}