81 lines
2.1 KiB
C
81 lines
2.1 KiB
C
|
// SPDX-License-Identifier: GPL-2.0-or-later
|
||
|
|
/*
|
||
|
|
* 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.
|
||
|
|
*/
|
||
|
|
#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);
|
||
|
|
}
|