/*-
 * Copyright 1996-1998 John D. Polstra.
 * 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 ``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 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: src/sys/i386/i386/elf_machdep.c,v 1.8 1999/12/21 11:14:02 eivind Exp $
 */

#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/linker.h>
#include <sys/sysent.h>
#include <sys/imgact_elf.h>
#include <sys/syscall.h>
#include <sys/signalvar.h>
#include <sys/vnode.h>
#include <machine/elf.h>
#include <machine/md_var.h>

static struct sysentvec elf64_dragonfly_sysvec = {
        .sv_size        = SYS_MAXSYSCALL,
        .sv_table       = sysent,
        .sv_sigsize     = 0,
        .sv_sigtbl      = NULL,
        .sv_errsize     = 0,
        .sv_errtbl      = NULL,
        .sv_transtrap   = NULL,
        .sv_fixup       = __elfN(dragonfly_fixup),
        .sv_sendsig     = sendsig,
        .sv_sigcode     = sigcode,
        .sv_szsigcode   = &szsigcode,
        .sv_name        = "DragonFly ELF64",
        .sv_coredump    = __elfN(coredump),
        .sv_imgact_try  = NULL,
        .sv_minsigstksz = MINSIGSTKSZ,
};

static Elf64_Brandinfo dragonfly_brand_info = {
        .brand          = ELFOSABI_NONE,
        .machine        = EM_X86_64,
        .compat_3_brand = "DragonFly",
        .emul_path      = NULL,
        .interp_path    = "/libexec/ld-elf.so.2",
        .sysvec         = &elf64_dragonfly_sysvec,
        .interp_newpath = NULL,
        .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE,
        .brand_note     = &elf64_dragonfly_brandnote,
};

SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_FIRST,
        (sysinit_cfunc_t) elf64_insert_brand_entry,
        &dragonfly_brand_info);

/* Process one elf relocation with addend. */
static int
elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
    int type, int local, elf_lookup_fn lookup)
{
        Elf64_Addr *where, val;
        Elf32_Addr *where32, val32;
        Elf_Addr addr;
        Elf_Addr addend;
        Elf_Size rtype, symidx;
        const Elf_Rel *rel;
        const Elf_Rela *rela;

        switch (type) {
        case ELF_RELOC_REL:
                rel = (const Elf_Rel *)data;
                where = (Elf_Addr *) (relocbase + rel->r_offset);
                rtype = ELF_R_TYPE(rel->r_info);
                symidx = ELF_R_SYM(rel->r_info);
                /* Addend is 32 bit on 32 bit relocs */
                switch (rtype) {
                case R_X86_64_PC32:
                case R_X86_64_PLT32:
                case R_X86_64_32:
                case R_X86_64_32S:
                        addend = *(Elf32_Addr *)where;
                        break;
                default:
                        addend = *where;
                        break;
                }
                break;
        case ELF_RELOC_RELA:
                rela = (const Elf_Rela *)data;
                where = (Elf_Addr *) (relocbase + rela->r_offset);
                addend = rela->r_addend;
                rtype = ELF_R_TYPE(rela->r_info);
                symidx = ELF_R_SYM(rela->r_info);
                break;
        default:
                panic("unknown reloc type %d", type);
        }

        switch (rtype) {

                case R_X86_64_NONE:     /* none */
                        break;

                case R_X86_64_64:               /* S + A */
                        if (lookup(lf, symidx, 1, &addr))
                                return -1;
                        val = addr + addend;
                        if (*where != val)
                                *where = val;
                        break;

                case R_X86_64_PC32:     /* S + A - P */
                case R_X86_64_PLT32:    /* XXX assume PLT as S too */
                        if (lookup(lf, symidx, 1, &addr))
                                return -1;
                        where32 = (Elf32_Addr *)where;
                        val32 = (Elf32_Addr)(addr + addend - (Elf_Addr)where);
                        if (*where32 != val32)
                                *where32 = val32;
                        break;

                case R_X86_64_32:       /* S + A zero extend */
                case R_X86_64_32S:      /* S + A sign extend */
                        if (lookup(lf, symidx, 1, &addr))
                                return -1;
                        val32 = (Elf32_Addr)(addr + addend);
                        where32 = (Elf32_Addr *)where;
                        if (*where32 != val32)
                                *where32 = val32;
                        break;

                case R_X86_64_COPY:     /* none */
                        /*
                         * There shouldn't be copy relocations in kernel
                         * objects.
                         */
                        kprintf("kldload: unexpected R_COPY relocation\n");
                        return -1;
                        break;

                case R_X86_64_GLOB_DAT: /* S */
                case R_X86_64_JMP_SLOT: /* XXX need addend + offset */
                        if (lookup(lf, symidx, 1, &addr))
                                return -1;
                        if (*where != addr)
                                *where = addr;
                        break;

                case R_X86_64_RELATIVE: /* B + A */
                        addr = relocbase + addend;
                        val = addr;
                        if (*where != val)
                                *where = val;
                        break;

                default:
                        kprintf("kldload: unexpected relocation type %ld\n",
                               rtype);
                        return -1;
        }
        return(0);
}

int
elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
    elf_lookup_fn lookup)
{

        return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
}

int
elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
    int type, elf_lookup_fn lookup)
{

        return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
}