fixcoff.c revision 1.13 
1/*	$NetBSD: fixcoff.c,v 1.13 2024/10/29 11:37:57 kre Exp $ */
2
3/*
4 * Copyright (c) 1999 National Aeronautics & Space Administration
5 * All rights reserved.
6 *
7 * This software was written by William Studenmund of the
8 * Numerical Aerospace Similation Facility, NASA Ames Research Center.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the National Aeronautics & Space Administration
19 *    nor the names of its contributors may be used to endorse or promote
20 *    products derived from this software without specific prior written
21 *    permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE NATIONAL AERONAUTICS & SPACE ADMINISTRATION
24 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
25 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
26 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE ADMINISTRATION OR CONTRIB-
27 * UTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
28 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
32 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
33 * POSSIBILITY OF SUCH DAMAGE.
34 */
35
36/*
37 * This program fixes up the extended xcoff headers generated when an elf
38 * file is turned into an xcoff one with the current objcopy. It should
39 * go away someday, when objcopy will correctly fix up the output xcoff
40 *
41 * Partially inspired by hack-coff, written by Paul Mackerras.
42 */
43
44#if HAVE_NBTOOL_CONFIG_H
45#include "nbtool_config.h"
46#else	/* HAVE_NBTOOL_CONFIG_H */
47#include <sys/endian.h>
48#endif	/* HAVE_NBTOOL_CONFIG_H */
49
50#include <stdio.h>
51#include <stdlib.h>
52#include <unistd.h>
53#include <fcntl.h>
54
55struct filehdr {
56#define U802WRMAGIC     0730
57#define U802ROMAGIC     0735
58#define U802TOCMAGIC    0737
59	char f_magic[2];
60	char f_nsect[2];
61	char f_time[4];
62	char f_symtab[4];
63	char f_nsyms[4];
64	char f_opthdr[2];
65	char f_flags[2];
66};
67
68struct sectionhdr {
69	char	s_name[8];
70	char	s_paddr[4];
71	char	s_vaddr[4];
72	char	s_size[4];
73	char	s_section[4];
74	char	s_reloc[4];
75	char	s_lineno[4];
76	char	s_nreloc[2];
77	char	s_nlineno[2];
78	char	s_flags[4];
79};
80
81struct aouthdr {
82	char	magic[2];
83	char	vstamp[2];
84	char	tsize[4];
85	char	dsize[4];
86	char	bsize[4];
87	char	entry[4];
88	char	text_start[4];
89	char	data_start[4];
90#define SMALL_AOUTSZ	28
91	char	o_toc[4];
92	char	o_snentry[2];
93	char	o_sntext[2];
94	char	o_sndata[2];
95	char	o_sntoc[2];
96	char	o_snloader[2];
97	char	o_snbss[2];
98	char	o_algntext[2];
99	char	o_algndata[2];
100	char	o_modtype[2];
101	char	o_cputype[2];
102	char	o_maxstack[4];
103	char	o_maxdata[4];
104	char	o_resv2[12];
105};
106#define RS6K_AOUTHDR_ZMAGIC     0x010B
107
108void
109usage(const char *prog)
110{
111	fprintf(stderr, "Usage: %s [-h] | [<file to fix>]\n", prog);
112}
113
114void
115help(const char *prog)
116{
117	fprintf(stderr, "%s\tis designed to fix the xcoff headers in a\n",prog);
118	fprintf(stderr,
119"\tbinary generated using objcopy from a non-xcoff source.\n");
120	usage(prog);
121	exit(0);
122}
123
124int
125main(int argc, char * const *argv)
126{
127	int	fd, i, n, ch;
128	struct	filehdr	fh;
129	struct	aouthdr aoh;
130	struct	sectionhdr sh;
131
132	while ((ch = getopt(argc, argv, "h")) != -1)
133	    switch (ch) {
134		case 'h':
135		help(getprogname());
136	}
137
138	argc -= optind;
139	argv += optind;
140
141	if (argc != 1) {
142		usage(getprogname());
143		exit(1);
144	}
145
146	if ((fd = open(argv[0], O_RDWR, 0)) == -1)
147		err(i, "%s", argv[0]);
148
149	/*
150	 * Make sure it looks like an xcoff file..
151	 */
152	if (read(fd, &fh, sizeof(fh)) != sizeof(fh))
153		err(1, "%s reading header", argv[0]);
154
155	i = be16toh(*(uint16_t *)fh.f_magic);
156	if ((i != U802WRMAGIC) && (i != U802ROMAGIC) && (i != U802TOCMAGIC))
157		errx(1, "%s: not a valid xcoff file", argv[0]);
158
159	/* Does the AOUT "Optional header" make sense? */
160	i = be16toh(*(uint16_t *)fh.f_opthdr);
161
162	if (i == SMALL_AOUTSZ)
163		errx(1, "%s: file has small \"optional\" header, inappropriate for use with %s", argv[0], getprogname());
164	else if (i != sizeof(aoh))
165		errx(1, "%s: invalid \"optional\" header", argv[0]);
166
167	if (read(fd, &aoh, i) != i)
168		err(1, "%s reading \"optional\" header", argv[0]);
169
170	/* Now start filing in the AOUT header */
171	*(uint16_t *)aoh.magic = htobe16(RS6K_AOUTHDR_ZMAGIC);
172	n = be16toh(*(uint16_t *)fh.f_nsect);
173
174	for (i = 0; i < n; i++) {
175		if (read(fd, &sh, sizeof(sh)) != sizeof(sh))
176			err(1, "%s reading section headers", argv[0]);
177		if (strcmp(sh.s_name, ".text") == 0) {
178			*(uint16_t *)(aoh.o_snentry) = htobe16(i+1);
179			*(uint16_t *)(aoh.o_sntext) = htobe16(i+1);
180		} else if (strcmp(sh.s_name, ".data") == 0) {
181			*(uint16_t *)(aoh.o_sndata) = htobe16(i+1);
182		} else if (strcmp(sh.s_name, ".bss") == 0) {
183			*(uint16_t *)(aoh.o_snbss) = htobe16(i+1);
184		}
185	}
186
187	/* now write it out */
188	if (pwrite(fd, &aoh, sizeof(aoh), sizeof(struct filehdr))
189			!= sizeof(aoh))
190		err(1, "%s writing modified header", argv[0]);
191	close(fd);
192	exit(0);
193}
194