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80 lines
2.1 KiB
80 lines
2.1 KiB
// 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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|
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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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