LXR linux/arch/powerpc/boot/hack-coff.c

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * hack-coff.c - hack the header of an xcoff file to fill in
   4 * a few fields needed by the Open Firmware xcoff loader on
   5 * Power Macs but not initialized by objcopy.
   6 *
   7 * Copyright (C) Paul Mackerras 1997.
   8 */
   9#include <stdio.h>
  10#include <stdlib.h>
  11#include <unistd.h>
  12#include <fcntl.h>
  13#include <string.h>
  14#include "rs6000.h"
  15
  16#define AOUT_MAGIC      0x010b
  17
  18#define get_16be(x)     ((((unsigned char *)(x))[0] << 8) \
  19                         + ((unsigned char *)(x))[1])
  20#define put_16be(x, v)  (((unsigned char *)(x))[0] = (v) >> 8, \
  21                         ((unsigned char *)(x))[1] = (v) & 0xff)
  22#define get_32be(x)     ((((unsigned char *)(x))[0] << 24) \
  23                         + (((unsigned char *)(x))[1] << 16) \
  24                         + (((unsigned char *)(x))[2] << 8) \
  25                         + ((unsigned char *)(x))[3])
  26
  27int
  28main(int ac, char **av)
  29{
  30    int fd;
  31    int i, nsect;
  32    int aoutsz;
  33    struct external_filehdr fhdr;
  34    AOUTHDR aout;
  35    struct external_scnhdr shdr;
  36
  37    if (ac != 2) {
  38        fprintf(stderr, "Usage: hack-coff coff-file\n");
  39        exit(1);
  40    }
  41    if ((fd = open(av[1], 2)) == -1) {
  42        perror(av[2]);
  43        exit(1);
  44    }
  45    if (read(fd, &fhdr, sizeof(fhdr)) != sizeof(fhdr))
  46        goto readerr;
  47    i = get_16be(fhdr.f_magic);
  48    if (i != U802TOCMAGIC && i != U802WRMAGIC && i != U802ROMAGIC) {
  49        fprintf(stderr, "%s: not an xcoff file\n", av[1]);
  50        exit(1);
  51    }
  52    aoutsz = get_16be(fhdr.f_opthdr);
  53    if (read(fd, &aout, aoutsz) != aoutsz)
  54        goto readerr;
  55    nsect = get_16be(fhdr.f_nscns);
  56    for (i = 0; i < nsect; ++i) {
  57        if (read(fd, &shdr, sizeof(shdr)) != sizeof(shdr))
  58            goto readerr;
  59        if (strcmp(shdr.s_name, ".text") == 0) {
  60            put_16be(aout.o_snentry, i+1);
  61            put_16be(aout.o_sntext, i+1);
  62        } else if (strcmp(shdr.s_name, ".data") == 0) {
  63            put_16be(aout.o_sndata, i+1);
  64        } else if (strcmp(shdr.s_name, ".bss") == 0) {
  65            put_16be(aout.o_snbss, i+1);
  66        }
  67    }
  68    put_16be(aout.magic, AOUT_MAGIC);
  69    if (lseek(fd, (long) sizeof(struct external_filehdr), 0) == -1
  70        || write(fd, &aout, aoutsz) != aoutsz) {
  71        fprintf(stderr, "%s: write error\n", av[1]);
  72        exit(1);
  73    }
  74    close(fd);
  75    exit(0);
  76
  77readerr:
  78    fprintf(stderr, "%s: read error or file too short\n", av[1]);
  79    exit(1);
  80}
  81