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 __FBSDID("$FreeBSD$");
31
32 #include <sys/types.h>
33 #include <sys/elf64.h>
34 #include <sys/endian.h>
35 #include <sys/mman.h>
36 #include <sys/stat.h>
37
38 #include <err.h>
39 #include <fcntl.h>
40 #include <stdio.h>
41 #include <stdlib.h>
42 #include <string.h>
43 #include <unistd.h>
44
45 #define xe16toh(x) ((data == ELFDATA2MSB) ? be16toh(x) : le16toh(x))
46 #define xe32toh(x) ((data == ELFDATA2MSB) ? be32toh(x) : le32toh(x))
47 #define xe64toh(x) ((data == ELFDATA2MSB) ? be64toh(x) : le64toh(x))
48 #define htoxe32(x) ((data == ELFDATA2MSB) ? htobe32(x) : htole32(x))
49
50 struct exec {
51 u_int32_t a_magic;
52 u_int32_t a_text;
53 u_int32_t a_data;
54 u_int32_t a_bss;
55 u_int32_t a_syms;
56 u_int32_t a_entry;
57 u_int32_t a_trsize;
58 u_int32_t a_drsize;
59 };
60 #define A_MAGIC 0x01030107
61
62 static void usage(void);
63
64 /*
65 * elf to a.out converter for freebsd/sparc64 bootblocks.
66 */
67 int
main(int ac,char ** av)68 main(int ac, char **av)
69 {
70 Elf64_Half phentsize;
71 Elf64_Half machine;
72 Elf64_Half phnum;
73 Elf64_Xword filesz;
74 Elf64_Xword memsz;
75 Elf64_Addr entry;
76 Elf64_Off offset;
77 Elf64_Off phoff;
78 Elf64_Word type;
79 unsigned char data;
80 struct stat sb;
81 struct exec a;
82 Elf64_Phdr *p;
83 Elf64_Ehdr *e;
84 void *v;
85 int efd;
86 int fd;
87 int c;
88 int i;
89
90 fd = STDIN_FILENO;
91 while ((c = getopt(ac, av, "o:")) != -1)
92 switch (c) {
93 case 'o':
94 if ((fd = open(optarg, O_CREAT|O_RDWR, 0644)) < 0)
95 err(1, "%s", optarg);
96 break;
97 case '?':
98 default:
99 usage();
100 }
101 ac -= optind;
102 av += optind;
103 if (ac == 0)
104 usage();
105
106 if ((efd = open(*av, O_RDONLY)) < 0 || fstat(efd, &sb) < 0)
107 err(1, NULL);
108 v = mmap(NULL, sb.st_size, PROT_READ, MAP_SHARED, efd, 0);
109 if ((e = v) == MAP_FAILED)
110 err(1, NULL);
111
112 if (!IS_ELF(*e))
113 errx(1, "not an elf file");
114 if (e->e_ident[EI_CLASS] != ELFCLASS64)
115 errx(1, "wrong class");
116 data = e->e_ident[EI_DATA];
117 if (data != ELFDATA2MSB && data != ELFDATA2LSB)
118 errx(1, "wrong data format");
119 if (e->e_ident[EI_VERSION] != EV_CURRENT)
120 errx(1, "wrong elf version");
121 machine = xe16toh(e->e_machine);
122 if (machine != EM_SPARCV9 && machine != EM_ALPHA)
123 errx(1, "wrong machine type");
124 phentsize = xe16toh(e->e_phentsize);
125 if (phentsize != sizeof(*p))
126 errx(1, "phdr size mismatch");
127
128 entry = xe64toh(e->e_entry);
129 phoff = xe64toh(e->e_phoff);
130 phnum = xe16toh(e->e_phnum);
131 p = (Elf64_Phdr *)((char *)e + phoff);
132 bzero(&a, sizeof(a));
133 for (i = 0; i < phnum; i++) {
134 type = xe32toh(p[i].p_type);
135 switch (type) {
136 case PT_LOAD:
137 if (a.a_magic != 0)
138 errx(1, "too many loadable segments");
139 filesz = xe64toh(p[i].p_filesz);
140 memsz = xe64toh(p[i].p_memsz);
141 offset = xe64toh(p[i].p_offset);
142 a.a_magic = htoxe32(A_MAGIC);
143 a.a_text = htoxe32(filesz);
144 a.a_bss = htoxe32(memsz - filesz);
145 a.a_entry = htoxe32(entry);
146 if (write(fd, &a, sizeof(a)) != sizeof(a) ||
147 write(fd, (char *)e + offset, filesz) != (ssize_t)filesz)
148 err(1, NULL);
149 break;
150 default:
151 break;
152 }
153 }
154
155 return (0);
156 }
157
158 static void
usage(void)159 usage(void)
160 {
161
162 fprintf(stderr, "usage: elf2aout [-o outfile] infile\n");
163 exit(1);
164 }
165