1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2002 Jake Burkholder
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30
31#include <sys/types.h>
32#include <sys/mman.h>
33#include <sys/stat.h>
34
35#include <err.h>
36#include <fcntl.h>
37#include <stdio.h>
38#include <stdlib.h>
39#include <string.h>
40#include <unistd.h>
41
42#include <elf.h>
43
44int elf2aout32(void *v, int fd);
45int elf2aout64(void *v, int fd);
46
47#define	xe16toh(x)	((data == ELFDATA2MSB) ? be16toh(x) : le16toh(x))
48#define	xe32toh(x)	((data == ELFDATA2MSB) ? be32toh(x) : le32toh(x))
49#define	xe64toh(x)	((data == ELFDATA2MSB) ? be64toh(x) : le64toh(x))
50#define	htoxe32(x)	((data == ELFDATA2MSB) ? htobe32(x) : htole32(x))
51
52struct exec {
53	u_int32_t	a_magic;
54	u_int32_t	a_text;
55	u_int32_t	a_data;
56	u_int32_t	a_bss;
57	u_int32_t	a_syms;
58	u_int32_t	a_entry;
59	u_int32_t	a_trsize;
60	u_int32_t	a_drsize;
61};
62
63/* we only support OMAGIC */
64#define OMAGIC 0407
65
66static void usage(void);
67
68/* parts from NetBSD */
69
70#define	MID_ZERO	0x000	/* unknown - implementation dependent */
71#define	MID_SUN010	0x001	/* sun 68010/68020 binary */
72#define	MID_SUN020	0x002	/* sun 68020-only binary */
73
74#define	MID_PC386	0x064	/* 386 PC binary. (so quoth BFD) */
75
76#define	MID_I386	0x086	/* i386 BSD binary */
77#define	MID_M68K	0x087	/* m68k BSD binary with 8K page sizes */
78#define	MID_M68K4K	0x088	/* m68k BSD binary with 4K page sizes */
79#define	MID_NS32532	0x089	/* ns32532 */
80#define	MID_SPARC	0x08a	/* sparc */
81#define	MID_PMAX	0x08b	/* pmax */
82#define	MID_VAX1K	0x08c	/* VAX 1K page size binaries */
83#define	MID_ALPHA	0x08d	/* Alpha BSD binary */
84#define	MID_MIPS	0x08e	/* big-endian MIPS */
85#define	MID_ARM6	0x08f	/* ARM6 */
86#define	MID_M680002K	0x090	/* m68000 with 2K page sizes */
87#define	MID_SH3		0x091	/* SH3 */
88
89#define	MID_POWERPC64	0x094	/* big-endian PowerPC 64 */
90#define	MID_POWERPC	0x095	/* big-endian PowerPC */
91#define	MID_VAX		0x096	/* VAX */
92#define	MID_MIPS1	0x097	/* MIPS1 */
93#define	MID_MIPS2	0x098	/* MIPS2 */
94#define	MID_M88K	0x099	/* m88k BSD */
95#define	MID_HPPA	0x09a	/* HP PARISC */
96#define	MID_SH5_64	0x09b	/* LP64 SH5 */
97#define	MID_SPARC64	0x09c	/* LP64 sparc */
98#define	MID_X86_64	0x09d	/* AMD x86-64 */
99#define	MID_SH5_32	0x09e	/* ILP32 SH5 */
100#define	MID_IA64	0x09f	/* Itanium */
101
102#define	MID_AARCH64	0x0b7	/* ARM AARCH64 */
103#define	MID_OR1K	0x0b8	/* OpenRISC 1000 */
104#define	MID_RISCV	0x0b9	/* Risc-V */
105
106#define	MID_HP200	0x0c8	/* hp200 (68010) BSD binary */
107
108#define	MID_HP300	0x12c	/* hp300 (68020+68881) BSD binary */
109
110#define	MID_HPUX800     0x20b   /* hp800 HP-UX binary */
111#define	MID_HPUX	0x20c	/* hp200/300 HP-UX binary */
112
113//(ex->e_machine, ex->e_ident[EI_DATA], ex->e_ident[EI_CLASS])
114static uint32_t
115get_mid(int m, int e, int c)
116{
117	switch (m) {
118	case EM_AARCH64:
119		return MID_AARCH64;
120	case EM_ALPHA:
121		return MID_ALPHA;
122	case EM_ARM:
123		return MID_ARM6;
124	case EM_PARISC:
125		return MID_HPPA;
126	case EM_386:
127		return MID_I386;
128	case EM_68K:
129		return MID_M68K;
130/*	case EM_OR1K:
131		return MID_OR1K;*/
132	case EM_MIPS:
133		if (e == ELFDATA2LSB)
134			return MID_PMAX;
135		else
136			return MID_MIPS;
137	case EM_PPC:
138		return MID_POWERPC;
139	case EM_PPC64:
140		return MID_POWERPC64;
141		break;
142	case EM_RISCV:
143		return MID_RISCV;
144	case EM_SH:
145		return MID_SH3;
146	case EM_SPARC:
147	case EM_SPARC32PLUS:
148	case EM_SPARCV9:
149		if (c == ELFCLASS32)
150			return MID_SPARC;
151		return MID_SPARC64;
152	case EM_X86_64:
153		return MID_X86_64;
154	case EM_VAX:
155		return MID_VAX;
156	case EM_NONE:
157		return MID_ZERO;
158	default:
159		break;
160	}
161	return MID_ZERO;
162}
163
164int
165elf2aout32(void *v, int fd)
166{
167	Elf32_Half phentsize;
168	Elf32_Half phnum;
169	Elf32_Word filesz;
170	Elf32_Word memsz;
171	Elf32_Addr entry;
172	Elf32_Off offset;
173	Elf32_Off phoff;
174	Elf32_Word type;
175
176	Elf32_Phdr *p;
177	Elf32_Ehdr *e = v;
178
179	unsigned char data = e->e_ident[EI_DATA];
180	struct exec a;
181	int i;
182	uint32_t mid;
183
184	mid = get_mid(xe16toh(e->e_machine), e->e_ident[EI_DATA], e->e_ident[EI_CLASS]);
185	phentsize = xe16toh(e->e_phentsize);
186	if (phentsize != sizeof(*p))
187		errx(1, "phdr size mismatch");
188
189	entry = xe32toh(e->e_entry);
190	phoff = xe32toh(e->e_phoff);
191	phnum = xe16toh(e->e_phnum);
192	p = (Elf32_Phdr *)((char *)e + phoff);
193	bzero(&a, sizeof(a));
194	for (i = 0; i < phnum; i++) {
195		type = xe32toh(p[i].p_type);
196		switch (type) {
197		case PT_LOAD:
198			if (a.a_magic != 0)
199				errx(1, "too many loadable segments");
200			filesz = xe32toh(p[i].p_filesz);
201			memsz = xe32toh(p[i].p_memsz);
202			offset = xe32toh(p[i].p_offset);
203			a.a_magic = htoxe32(((uint32_t)mid << 16) | OMAGIC);
204			a.a_text = htoxe32(filesz);
205			a.a_bss = htoxe32(memsz - filesz);
206			a.a_entry = htoxe32(entry);
207			if (write(fd, &a, sizeof(a)) != sizeof(a) ||
208			    write(fd, (char *)e + offset, filesz) != (ssize_t)filesz)
209				err(1, NULL);
210			break;
211		default:
212			break;
213		}
214	}
215	return (0);
216}
217
218
219int
220elf2aout64(void *v, int fd)
221{
222	Elf64_Half phentsize;
223	Elf64_Half phnum;
224	Elf64_Xword filesz;
225	Elf64_Xword memsz;
226	Elf64_Addr entry;
227	Elf64_Off offset;
228	Elf64_Off phoff;
229	Elf64_Word type;
230
231	Elf64_Phdr *p;
232	Elf64_Ehdr *e = v;
233
234	unsigned char data = e->e_ident[EI_DATA];
235	struct exec a;
236	int i;
237	uint32_t mid;
238
239	mid = get_mid(xe16toh(e->e_machine), e->e_ident[EI_DATA], e->e_ident[EI_CLASS]);
240	phentsize = xe16toh(e->e_phentsize);
241	if (phentsize != sizeof(*p))
242		errx(1, "phdr size mismatch");
243
244	entry = xe64toh(e->e_entry);
245	phoff = xe64toh(e->e_phoff);
246	phnum = xe16toh(e->e_phnum);
247	p = (Elf64_Phdr *)((char *)e + phoff);
248	bzero(&a, sizeof(a));
249	for (i = 0; i < phnum; i++) {
250		type = xe32toh(p[i].p_type);
251		switch (type) {
252		case PT_LOAD:
253			if (a.a_magic != 0)
254				errx(1, "too many loadable segments");
255			filesz = xe64toh(p[i].p_filesz);
256			memsz = xe64toh(p[i].p_memsz);
257			offset = xe64toh(p[i].p_offset);
258			a.a_magic = htoxe32(((uint32_t)mid << 16) | OMAGIC);
259			a.a_text = htoxe32(filesz);
260			a.a_bss = htoxe32(memsz - filesz);
261			a.a_entry = htoxe32(entry);
262			if (write(fd, &a, sizeof(a)) != sizeof(a) ||
263			    write(fd, (char *)e + offset, filesz) != (ssize_t)filesz)
264				err(1, NULL);
265			break;
266		default:
267			break;
268		}
269	}
270	return (0);
271}
272
273
274/*
275 * elf to a.out converter for freebsd/sparc64 bootblocks.
276 */
277int
278main(int ac, char **av)
279{
280	unsigned char data;
281	struct stat sb;
282	Elf64_Ehdr *e;
283	void *v;
284	int efd;
285	int fd;
286	int c;
287
288	fd = STDIN_FILENO;
289	while ((c = getopt(ac, av, "o:")) != -1)
290		switch (c) {
291		case 'o':
292			if ((fd = open(optarg, O_CREAT|O_RDWR, 0644)) < 0)
293				err(1, "%s", optarg);
294			break;
295		case '?':
296		default:
297			usage();
298		}
299	ac -= optind;
300	av += optind;
301	if (ac == 0)
302		usage();
303
304	if ((efd = open(*av, O_RDONLY)) < 0 || fstat(efd, &sb) < 0)
305		err(1, NULL);
306	v = mmap(NULL, sb.st_size, PROT_READ, MAP_SHARED, efd, 0);
307	if ((e = v) == MAP_FAILED)
308		err(1, NULL);
309
310	if (!IS_ELF(*e))
311		errx(1, "not an elf file");
312	if (e->e_ident[EI_CLASS] != ELFCLASS64 && e->e_ident[EI_CLASS] != ELFCLASS32)
313		errx(1, "wrong class");
314	data = e->e_ident[EI_DATA];
315	if (data != ELFDATA2MSB && data != ELFDATA2LSB)
316		errx(1, "wrong data format");
317	if (e->e_ident[EI_VERSION] != EV_CURRENT)
318		errx(1, "wrong elf version");
319
320	if (e->e_ident[EI_CLASS] == ELFCLASS64)
321		return elf2aout64(v, fd);
322	else
323		return elf2aout32(v, fd);
324}
325
326static void
327usage(void)
328{
329
330	fprintf(stderr, "usage: elf2aout [-o outfile] infile\n");
331	exit(1);
332}
333