fixcoff.c revision 1.6 
1/*	$NetBSD: fixcoff.c,v 1.6 2003/12/10 23:08:14 matt 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#include <stdio.h>
45#include <stdlib.h>
46#include <unistd.h>
47#include <fcntl.h>
48
49struct filehdr {
50#define U802WRMAGIC     0730
51#define U802ROMAGIC     0735
52#define U802TOCMAGIC    0737
53	char f_magic[2];
54	char f_nsect[2];
55	char f_time[4];
56	char f_symtab[4];
57	char f_nsyms[4];
58	char f_opthdr[2];
59	char f_flags[2];
60};
61
62struct sectionhdr {
63	char	s_name[8];
64	char	s_paddr[4];
65	char	s_vaddr[4];
66	char	s_size[4];
67	char	s_section[4];
68	char	s_reloc[4];
69	char	s_lineno[4];
70	char	s_nreloc[2];
71	char	s_nlineno[2];
72	char	s_flags[4];
73};
74
75struct aouthdr {
76	char	magic[2];
77	char	vstamp[2];
78	char	tsize[4];
79	char	dsize[4];
80	char	bsize[4];
81	char	entry[4];
82	char	text_start[4];
83	char	data_start[4];
84#define SMALL_AOUTSZ	28
85	char	o_toc[4];
86	char	o_snentry[2];
87	char	o_sntext[2];
88	char	o_sndata[2];
89	char	o_sntoc[2];
90	char	o_snloader[2];
91	char	o_snbss[2];
92	char	o_algntext[2];
93	char	o_algndata[2];
94	char	o_modtype[2];
95	char	o_cputype[2];
96	char	o_maxstack[4];
97	char	o_maxdata[4];
98	char	o_resv2[12];
99};
100#define RS6K_AOUTHDR_ZMAGIC     0x010B
101
102void
103usage(prog)
104	char	*prog;
105{
106	fprintf(stderr, "Usage: %s [-h] | [<file to fix>]\n", prog);
107}
108
109void
110help(prog)
111	char	*prog;
112{
113	fprintf(stderr, "%s\tis designed to fix the xcoff headers in a\n",prog);
114	fprintf(stderr,
115"\tbinary generated using objcopy from a non-xcoff source.\n");
116	usage(prog);
117	exit(0);
118}
119
120main(argc, argv)
121	int		argc;
122	char * const	*argv;
123{
124	int	fd, i, n, ch;
125	struct	filehdr	fh;
126	struct	aouthdr aoh;
127	struct	sectionhdr sh;
128
129	while ((ch = getopt(argc, argv, "h")) != -1)
130	    switch (ch) {
131		case 'h':
132		help(getprogname());
133	}
134
135	argc -= optind;
136	argv += optind;
137
138	if (argc != 1) {
139		usage(getprogname());
140		exit(1);
141	}
142
143	if ((fd = open(argv[0], O_RDWR, 0)) == -1)
144		err(i, "%s", argv[0]);
145
146	/*
147	 * Make sure it looks like an xcoff file..
148	 */
149	if (read(fd, &fh, sizeof(fh)) != sizeof(fh))
150		err(1, "%s reading header", argv[0]);
151
152	i = ntohs(*(uint16_t *)fh.f_magic);
153	if ((i != U802WRMAGIC) && (i != U802ROMAGIC) && (i != U802TOCMAGIC))
154		errx(1, "%s: not a valid xcoff file", argv[0]);
155
156	/* Does the AOUT "Optional header" make sense? */
157	i = ntohs(*(uint16_t *)fh.f_opthdr);
158
159	if (i == SMALL_AOUTSZ)
160		errx(1, "%s: file has small \"optional\" header, inappropriate for use with %s", argv[0], getprogname());
161	else if (i != sizeof(aoh))
162		errx(1, "%s: invalid \"optional\" header", argv[0]);
163
164	if (read(fd, &aoh, i) != i)
165		err(1, "%s reading \"optional\" header", argv[0]);
166
167	/* Now start filing in the AOUT header */
168	*(uint16_t *)aoh.magic = htons(RS6K_AOUTHDR_ZMAGIC);
169	n = ntohs(*(uint16_t *)fh.f_nsect);
170
171	for (i = 0; i < n; i++) {
172		if (read(fd, &sh, sizeof(sh)) != sizeof(sh))
173			err(1, "%s reading section headers", argv[0]);
174		if (strcmp(sh.s_name, ".text") == 0) {
175			*(uint16_t *)(aoh.o_snentry) = htons(i+1);
176			*(uint16_t *)(aoh.o_sntext) = htons(i+1);
177		} else if (strcmp(sh.s_name, ".data") == 0) {
178			*(uint16_t *)(aoh.o_sndata) = htons(i+1);
179		} else if (strcmp(sh.s_name, ".bss") == 0) {
180			*(uint16_t *)(aoh.o_snbss) = htons(i+1);
181		}
182	}
183
184	/* now write it out */
185	if (pwrite(fd, &aoh, sizeof(aoh), sizeof(struct filehdr))
186			!= sizeof(aoh))
187		err(1, "%s writing modified header", argv[0]);
188	close(fd);
189	exit(0);
190}
191