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("$FreeBSD$");
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#include <stdio.h>
39#include <stdlib.h>
40#include <string.h>
41#include <unistd.h>
42
43#define	xe16toh(x)	((data == ELFDATA2MSB) ? be16toh(x) : le16toh(x))
44#define	xe32toh(x)	((data == ELFDATA2MSB) ? be32toh(x) : le32toh(x))
45#define	xe64toh(x)	((data == ELFDATA2MSB) ? be64toh(x) : le64toh(x))
46#define	htoxe32(x)	((data == ELFDATA2MSB) ? htobe32(x) : htole32(x))
47
48struct exec {
49	u_int32_t	a_magic;
50	u_int32_t	a_text;
51	u_int32_t	a_data;
52	u_int32_t	a_bss;
53	u_int32_t	a_syms;
54	u_int32_t	a_entry;
55	u_int32_t	a_trsize;
56	u_int32_t	a_drsize;
57};
58#define A_MAGIC 0x01030107
59
60static void usage(void);
61
62/*
63 * elf to a.out converter for freebsd/sparc64 bootblocks.
64 */
65int
66main(int ac, char **av)
67{
68	Elf64_Half phentsize;
69	Elf64_Half machine;
70	Elf64_Half phnum;
71	Elf64_Xword filesz;
72	Elf64_Xword memsz;
73	Elf64_Addr entry;
74	Elf64_Off offset;
75	Elf64_Off phoff;
76	Elf64_Word type;
77	unsigned char data;
78	struct stat sb;
79	struct exec a;
80	Elf64_Phdr *p;
81	Elf64_Ehdr *e;
82	void *v;
83	int efd;
84	int fd;
85	int c;
86	int i;
87
88	fd = STDIN_FILENO;
89	while ((c = getopt(ac, av, "o:")) != -1)
90		switch (c) {
91		case 'o':
92			if ((fd = open(optarg, O_CREAT|O_RDWR, 0644)) < 0)
93				err(1, "%s", optarg);
94			break;
95		case '?':
96		default:
97			usage();
98		}
99	ac -= optind;
100	av += optind;
101	if (ac == 0)
102		usage();
103
104	if ((efd = open(*av, O_RDONLY)) < 0 || fstat(efd, &sb) < 0)
105		err(1, NULL);
106	v = mmap(NULL, sb.st_size, PROT_READ, MAP_SHARED, efd, 0);
107	if ((e = v) == MAP_FAILED)
108		err(1, NULL);
109
110	if (!IS_ELF(*e))
111		errx(1, "not an elf file");
112	if (e->e_ident[EI_CLASS] != ELFCLASS64)
113		errx(1, "wrong class");
114	data = e->e_ident[EI_DATA];
115	if (data != ELFDATA2MSB && data != ELFDATA2LSB)
116		errx(1, "wrong data format");
117	if (e->e_ident[EI_VERSION] != EV_CURRENT)
118		errx(1, "wrong elf version");
119	machine = xe16toh(e->e_machine);
120	if (machine != EM_SPARCV9 && machine != EM_ALPHA)
121		errx(1, "wrong machine type");
122	phentsize = xe16toh(e->e_phentsize);
123	if (phentsize != sizeof(*p))
124		errx(1, "phdr size mismatch");
125
126	entry = xe64toh(e->e_entry);
127	phoff = xe64toh(e->e_phoff);
128	phnum = xe16toh(e->e_phnum);
129	p = (Elf64_Phdr *)((char *)e + phoff);
130	bzero(&a, sizeof(a));
131	for (i = 0; i < phnum; i++) {
132		type = xe32toh(p[i].p_type);
133		switch (type) {
134		case PT_LOAD:
135			if (a.a_magic != 0)
136				errx(1, "too many loadable segments");
137			filesz = xe64toh(p[i].p_filesz);
138			memsz = xe64toh(p[i].p_memsz);
139			offset = xe64toh(p[i].p_offset);
140			a.a_magic = htoxe32(A_MAGIC);
141			a.a_text = htoxe32(filesz);
142			a.a_bss = htoxe32(memsz - filesz);
143			a.a_entry = htoxe32(entry);
144			if (write(fd, &a, sizeof(a)) != sizeof(a) ||
145			    write(fd, (char *)e + offset, filesz) != (ssize_t)filesz)
146				err(1, NULL);
147			break;
148		default:
149			break;
150		}
151	}
152
153	return (0);
154}
155
156static void
157usage(void)
158{
159
160	fprintf(stderr, "usage: elf2aout [-o outfile] infile\n");
161	exit(1);
162}
163