/*      $OpenBSD: mopa.out.c,v 1.19 2024/10/16 18:47:48 miod Exp $ */

/*
 * mopa.out - Convert a Unix format kernel into something that
 * can be transferred via MOP.
 *
 * This code was written while referring to the NetBSD/vax boot
 * loader. Therefore anything that can be booted by the Vax
 * should be convertible with this program.
 *
 * If necessary, the a.out header is stripped, and the program
 * segments are padded out. The BSS segment is zero filled.
 * A header is prepended that looks like an IHD header. In
 * particular the Unix machine ID is placed where mopd expects
 * the image type to be (offset is IHD_W_ALIAS). If the machine
 * ID could be mistaken for a DEC image type, then the conversion
 * is aborted. The original a.out header is copied into the front
 * of the header so that once we have detected the Unix machine
 * ID we can haul the load address and the xfer address out.
 */

/*
 * Copyright (c) 1996 Lloyd Parkes.  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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Lloyd Parkes.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * 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.
 */

#include "os.h"
#include "common/common.h"
#include "common/mopdef.h"
#include "common/file.h"
#if defined(__OpenBSD__)
#include <a.out.h>
#endif
#if defined(__FreeBSD__)
#include <sys/imgact_aout.h>
#endif
#if defined(__bsdi__)
#include <a.out.h>
#define NOAOUT
#endif
#if !defined(MID_VAX)
#define MID_VAX 140
#endif

#ifndef NOELF
#if defined(__NetBSD__) || defined(__OpenBSD__)
#include <elf.h>
#else
#define NOELF
#endif
#endif

#ifndef NOELF
#if !defined(_LP64)
#define NOELF64
#endif
#endif

u_char header[512];             /* The MOP header we generate is 1 block. */
#if !defined(NOAOUT)
struct exec ex, ex_swap;
#endif

int
main (int argc, char **argv)
{
        FILE   *out;            /* A FILE because that is easier. */
        int     i, j;
        struct dllist dl;
        short image_type;

#ifdef NOAOUT
        fprintf(stderr, "%s: has no function in OS/BSD\n", argv[0]);
        return(1);
#endif

        if (argc != 3) {
                fprintf (stderr, "usage: %s infile outfile\n", argv[0]);
                return (1);
        }

        dl.ldfd = open (argv[1], O_RDONLY);
        if (dl.ldfd == -1)
                err(2, "open `%s'", argv[1]);

        if (GetFileInfo(&dl, 0) == -1)
                errx(3, "`%s' is an unknown file type", argv[1]);

        switch (dl.image_type) {
        case IMAGE_TYPE_MOP:
                errx(3, "`%s' is already a MOP image", argv[1]);
                break;

#ifndef NOELF
        case IMAGE_TYPE_ELF32:
                if (dl.e_machine != EM_VAX)
                        printf("WARNING: `%s' is not a VAX image "
                            "(machine=%d)\n", argv[1], dl.e_machine);
                for (i = 0, j = 0; j < dl.e_nsec; j++)
                        i += dl.e_sections[j].s_fsize + dl.e_sections[j].s_pad;
                image_type = IHD_C_NATIVE;
                break;
#endif

#if !defined(NOELF) && !defined(NOELF64)
        case IMAGE_TYPE_ELF64:
                if (dl.e_machine != EM_ALPHA && dl.e_machine != EM_ALPHA_EXP)
                        printf("WARNING: `%s' is not an ALPHA image "
                            "(machine=%d)\n", argv[1], dl.e_machine);
                for (i = 0, j = 0; j < dl.e_nsec; j++)
                        i += dl.e_sections[j].s_fsize + dl.e_sections[j].s_pad;
                image_type = IHD_C_ALPHA;
                break;
#endif

#ifndef NOAOUT
        case IMAGE_TYPE_AOUT:
                if (dl.a_mid != MID_VAX)
                        printf("WARNING: `%s' is not a VAX image (mid=%d)\n",
                            argv[1], dl.a_mid);
                i = dl.a_text + dl.a_text_fill + dl.a_data + dl.a_data_fill +
                    dl.a_bss  + dl.a_bss_fill;
                image_type = IHD_C_NATIVE;
                break;
#endif

        default:
                errx(3, "Image type `%s' not supported",
                    FileTypeName(dl.image_type));
        }

        dl.nloadaddr = dl.loadaddr;
        dl.lseek     = lseek(dl.ldfd,0L,SEEK_CUR);
        dl.a_lseek   = 0;
        dl.count     = 0;
        dl.dl_bsz    = 512;

        switch (image_type) {
        default:
        case IHD_C_NATIVE:
                /* Offset to ISD section. */
                mopFilePutLX(header, IHD_W_SIZE, 0xd4, 2);
                /* Offset to 1st section.*/
                mopFilePutLX(header, IHD_W_ACTIVOFF, 0x30, 2);
                /* It's a VAX image.*/
                mopFilePutLX(header, IHD_W_ALIAS, IHD_C_NATIVE, 2);
                /* Only one header block. */
                mopFilePutLX(header, IHD_B_HDRBLKCNT, 1, 1);

                /* Xfer Addr */
                mopFilePutLX(header, 0x30 + IHA_L_TFRADR1, dl.xferaddr, 4);

                /* load Addr */
                mopFilePutLX(header, 0xd4 + ISD_V_VPN, dl.loadaddr / 512, 2);
                /* Imagesize in blks.*/
                i = (i + 1) / 512;
                mopFilePutLX(header, 0xd4 + ISD_W_PAGCNT, i, 2);
                break;
        case IHD_C_ALPHA:
                /* Offset to ISD section. */
                mopFilePutLX(header, EIHD_L_ISDOFF, 0xd4, 4);
                /* It's an alpha image.*/
                mopFilePutLX(header, IHD_W_ALIAS, IHD_C_ALPHA, 2);
                /* Only one header block. */
                mopFilePutLX(header, EIHD_L_HDRBLKCNT, 1, 4);

                /* Imagesize in bytes.*/
                mopFilePutLX(header, 0xd4 + EISD_L_SECSIZE, i, 4);
                break;
        }

        out = fopen (argv[2], "w");
        if (!out)
                err(2, "writing `%s'", argv[2]);

        /* Now we do the actual work. Write MOP-image header */

        fwrite (header, sizeof (header), 1, out);

        switch (dl.image_type) {
        case IMAGE_TYPE_MOP:
                abort();

        case IMAGE_TYPE_ELF32:
#ifdef NOELF
                abort();
#else
                fprintf(stderr, "copying ");
                for (j = 0; j < dl.e_nsec; j++)
                        fprintf(stderr, "%s%u+%u", j == 0 ? "" : "+",
                            dl.e_sections[j].s_fsize,
                            dl.e_sections[j].s_pad);
                fprintf(stderr, "->0x%x\n", dl.xferaddr);
#endif
                break;

        case IMAGE_TYPE_AOUT:
#ifdef NOAOUT
                abort();
#else
                fprintf(stderr, "copying %u+%u+%u->0x%x\n", dl.a_text,
                    dl.a_data, dl.a_bss, dl.xferaddr);
#endif
                break;
        default:
                break;
        }

        while ((i = mopFileRead(&dl,header)) > 0) {
                (void)fwrite(header, i, 1, out);
        }

        fclose (out);
        exit(0);
}