81 lines
2.1 KiB
C
81 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* hack-coff.c - hack the header of an xcoff file to fill in
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* a few fields needed by the Open Firmware xcoff loader on
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* Power Macs but not initialized by objcopy.
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*
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* Copyright (C) Paul Mackerras 1997.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <string.h>
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#include "rs6000.h"
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#define AOUT_MAGIC 0x010b
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#define get_16be(x) ((((unsigned char *)(x))[0] << 8) \
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+ ((unsigned char *)(x))[1])
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#define put_16be(x, v) (((unsigned char *)(x))[0] = (v) >> 8, \
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((unsigned char *)(x))[1] = (v) & 0xff)
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#define get_32be(x) ((((unsigned char *)(x))[0] << 24) \
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+ (((unsigned char *)(x))[1] << 16) \
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+ (((unsigned char *)(x))[2] << 8) \
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+ ((unsigned char *)(x))[3])
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int
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main(int ac, char **av)
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{
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int fd;
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int i, nsect;
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int aoutsz;
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struct external_filehdr fhdr;
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AOUTHDR aout;
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struct external_scnhdr shdr;
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if (ac != 2) {
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fprintf(stderr, "Usage: hack-coff coff-file\n");
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exit(1);
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}
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if ((fd = open(av[1], 2)) == -1) {
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perror(av[2]);
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exit(1);
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}
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if (read(fd, &fhdr, sizeof(fhdr)) != sizeof(fhdr))
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goto readerr;
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i = get_16be(fhdr.f_magic);
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if (i != U802TOCMAGIC && i != U802WRMAGIC && i != U802ROMAGIC) {
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fprintf(stderr, "%s: not an xcoff file\n", av[1]);
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exit(1);
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}
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aoutsz = get_16be(fhdr.f_opthdr);
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if (read(fd, &aout, aoutsz) != aoutsz)
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goto readerr;
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nsect = get_16be(fhdr.f_nscns);
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for (i = 0; i < nsect; ++i) {
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if (read(fd, &shdr, sizeof(shdr)) != sizeof(shdr))
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goto readerr;
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if (strcmp(shdr.s_name, ".text") == 0) {
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put_16be(aout.o_snentry, i+1);
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put_16be(aout.o_sntext, i+1);
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} else if (strcmp(shdr.s_name, ".data") == 0) {
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put_16be(aout.o_sndata, i+1);
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} else if (strcmp(shdr.s_name, ".bss") == 0) {
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put_16be(aout.o_snbss, i+1);
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}
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}
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put_16be(aout.magic, AOUT_MAGIC);
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if (lseek(fd, (long) sizeof(struct external_filehdr), 0) == -1
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|| write(fd, &aout, aoutsz) != aoutsz) {
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fprintf(stderr, "%s: write error\n", av[1]);
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exit(1);
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}
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close(fd);
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exit(0);
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readerr:
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fprintf(stderr, "%s: read error or file too short\n", av[1]);
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exit(1);
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}
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