Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*

 * hack-coff.c - hack the header of an xcoff file to fill in

 * a few fields needed by the Open Firmware xcoff loader on

 * Power Macs but not initialized by objcopy.

 *

 * Copyright (C) Paul Mackerras 1997.

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version

 * 2 of the License, or (at your option) any later version.

 */

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#include <fcntl.h>

#include <string.h>

#include "rs6000.h"

#define AOUT_MAGIC      0x010b

#define get_16be(x)     ((((unsigned char *)(x))[0] << 8) \

                         + ((unsigned char *)(x))[1])

#define put_16be(x, v)  (((unsigned char *)(x))[0] = (v) >> 8, \

                         ((unsigned char *)(x))[1] = (v) & 0xff)

#define get_32be(x)     ((((unsigned char *)(x))[0] << 24) \

                         + (((unsigned char *)(x))[1] << 16) \

                         + (((unsigned char *)(x))[2] << 8) \

                         + ((unsigned char *)(x))[3])

int

main(int ac, char **av)

{

    int fd;

    int i, nsect;

    int aoutsz;

    struct external_filehdr fhdr;

    AOUTHDR aout;

    struct external_scnhdr shdr;

    if (ac != 2) {

        fprintf(stderr, "Usage: hack-coff coff-file\n");

        exit(1);

    }

    if ((fd = open(av[1], 2)) == -1) {

        perror(av[2]);

        exit(1);

    }

    if (read(fd, &fhdr, sizeof(fhdr)) != sizeof(fhdr))

        goto readerr;

    i = get_16be(fhdr.f_magic);

    if (i != U802TOCMAGIC && i != U802WRMAGIC && i != U802ROMAGIC) {

        fprintf(stderr, "%s: not an xcoff file\n", av[1]);

        exit(1);

    }

    aoutsz = get_16be(fhdr.f_opthdr);

    if (read(fd, &aout, aoutsz) != aoutsz)

        goto readerr;

    nsect = get_16be(fhdr.f_nscns);

    for (i = 0; i < nsect; ++i) {

        if (read(fd, &shdr, sizeof(shdr)) != sizeof(shdr))

            goto readerr;

        if (strcmp(shdr.s_name, ".text") == 0) {

            put_16be(aout.o_snentry, i+1);

            put_16be(aout.o_sntext, i+1);

        } else if (strcmp(shdr.s_name, ".data") == 0) {

            put_16be(aout.o_sndata, i+1);

        } else if (strcmp(shdr.s_name, ".bss") == 0) {

            put_16be(aout.o_snbss, i+1);

        }

    }

    put_16be(aout.magic, AOUT_MAGIC);

    if (lseek(fd, (long) sizeof(struct external_filehdr), 0) == -1

        || write(fd, &aout, aoutsz) != aoutsz) {

        fprintf(stderr, "%s: write error\n", av[1]);

        exit(1);

    }

    close(fd);

    exit(0);

readerr:

    fprintf(stderr, "%s: read error or file too short\n", av[1]);

    exit(1);

}