elf2aout.c revision 96982 
1/*-
2 * Copyright (c) 2002 Jake Burkholder
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: head/usr.bin/elf2aout/elf2aout.c 96982 2002-05-20 08:05:58Z ru $");
29
30#include <sys/types.h>
31#include <sys/elf64.h>
32#include <sys/endian.h>
33#include <sys/mman.h>
34#include <sys/stat.h>
35
36#include <err.h>
37#include <fcntl.h>
38
39struct exec {
40	u_int32_t	a_magic;
41	u_int32_t	a_text;
42	u_int32_t	a_data;
43	u_int32_t	a_bss;
44	u_int32_t	a_syms;
45	u_int32_t	a_entry;
46	u_int32_t	a_trsize;
47	u_int32_t	a_drsize;
48};
49#define A_MAGIC 0x01030107
50
51extern char *optarg;
52extern int optind;
53
54static void usage(void);
55
56/*
57 * elf to a.out converter for freebsd/sparc64 bootblocks.
58 */
59int
60main(int ac, char **av)
61{
62	Elf64_Quarter phentsize;
63	Elf64_Quarter machine;
64	Elf64_Quarter phnum;
65	Elf64_Size filesz;
66	Elf64_Size memsz;
67	Elf64_Addr entry;
68	Elf64_Off offset;
69	Elf64_Off phoff;
70	Elf64_Half type;
71	struct stat sb;
72	struct exec a;
73	Elf64_Phdr *p;
74	Elf64_Ehdr *e;
75	void *v;
76	int efd;
77	int fd;
78	int c;
79	int i;
80
81	while ((c = getopt(ac, av, "o:")) != -1)
82		switch (c) {
83		case 'o':
84			if ((fd = open(optarg, O_CREAT|O_RDWR, 0644)) < 0)
85				err(1, "%s", optarg);
86			break;
87		case '?':
88		default:
89			usage();
90		}
91	ac -= optind;
92	av += optind;
93	if (ac == 0)
94		usage();
95
96	if ((efd = open(*av, O_RDONLY)) < 0 || fstat(efd, &sb) < 0)
97		err(1, NULL);
98	v = mmap(NULL, sb.st_size, PROT_READ, MAP_SHARED, efd, 0);
99	if ((e = v) == MAP_FAILED)
100		err(1, NULL);
101
102	if (!IS_ELF(*e))
103		errx(1, "not an elf file");
104	if (e->e_ident[EI_CLASS] != ELFCLASS64)
105		errx(1, "wrong class");
106	if (e->e_ident[EI_DATA] != ELFDATA2MSB)
107		errx(1, "wrong data format");
108	if (e->e_ident[EI_VERSION] != EV_CURRENT)
109		errx(1, "wrong elf version");
110	machine = be16toh(e->e_machine);
111	if (machine != EM_SPARCV9)
112		errx(1, "wrong machine type");
113	phentsize = be16toh(e->e_phentsize);
114	if (phentsize != sizeof(*p))
115		errx(1, "phdr size mismatch");
116
117	entry = be64toh(e->e_entry);
118	phoff = be64toh(e->e_phoff);
119	phnum = be16toh(e->e_phnum);
120	p = (Elf64_Phdr *)((char *)e + phoff);
121	bzero(&a, sizeof(a));
122	for (i = 0; i < phnum; i++) {
123		type = be32toh(p[i].p_type);
124		switch (type) {
125		case PT_LOAD:
126			if (a.a_magic != 0)
127				errx(1, "too many loadable segments");
128			filesz = be64toh(p[i].p_filesz);
129			memsz = be64toh(p[i].p_memsz);
130			offset = be64toh(p[i].p_offset);
131			a.a_magic = htobe32(A_MAGIC);
132			a.a_text = htobe32(filesz);
133			a.a_bss = htobe32(memsz - filesz);
134			a.a_entry = htobe32(entry);
135			if (write(fd, &a, sizeof(a)) != sizeof(a) ||
136			    write(fd, (char *)e + offset, filesz) != filesz)
137				err(1, NULL);
138			break;
139		default:
140			break;
141		}
142	}
143
144	return (0);
145}
146
147static void
148usage(void)
149{
150
151	errx(1, "usage: elftoaout -o outfile infile");
152}
153