1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 1999 Global Technology Associates, Inc.
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
19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
21 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
22 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
23 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
25 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
26 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * $FreeBSD$
29 */
30
31 #define _KERNEL
32 #include <sys/param.h>
33 #undef _KERNEL
34 #include <sys/types.h>
35 #include <sys/stat.h>
36 #include <sys/wait.h>
37
38 #include <err.h>
39 #include <fcntl.h>
40 #include <stdio.h>
41 #include <stdlib.h>
42 #include <unistd.h>
43
44 #include <a.out.h>
45
46 #include "aouthdr.h"
47 #include "elfhdr.h"
48 #include "kgzip.h"
49
50 static void mk_data(const struct iodesc *i, const struct iodesc *,
51 struct kgz_hdr *, size_t);
52 static int ld_elf(const struct iodesc *, const struct iodesc *,
53 struct kgz_hdr *, const Elf32_Ehdr *);
54 static int ld_aout(const struct iodesc *, const struct iodesc *,
55 struct kgz_hdr *, const struct exec *);
56
57 /*
58 * Compress executable and output it in relocatable object format.
59 */
60 void
kgzcmp(struct kgz_hdr * kh,const char * f1,const char * f2)61 kgzcmp(struct kgz_hdr *kh, const char *f1, const char *f2)
62 {
63 struct iodesc idi, ido;
64 struct kgz_hdr khle;
65
66 if ((idi.fd = open(idi.fname = f1, O_RDONLY)) == -1)
67 err(1, "%s", idi.fname);
68 if ((ido.fd = open(ido.fname = f2, O_CREAT | O_TRUNC | O_WRONLY,
69 0666)) == -1)
70 err(1, "%s", ido.fname);
71 kh->ident[0] = KGZ_ID0;
72 kh->ident[1] = KGZ_ID1;
73 kh->ident[2] = KGZ_ID2;
74 kh->ident[3] = KGZ_ID3;
75 mk_data(&idi, &ido, kh,
76 (format == F_AOUT ? sizeof(struct kgz_aouthdr0) :
77 sizeof(struct kgz_elfhdr)) +
78 sizeof(struct kgz_hdr));
79 kh->dload &= 0xffffff;
80 kh->entry &= 0xffffff;
81 if (format == F_AOUT) {
82 struct kgz_aouthdr0 ahdr0 = aouthdr0;
83 struct kgz_aouthdr1 ahdr1 = aouthdr1;
84 unsigned x = (sizeof(struct kgz_hdr) + kh->nsize) & (16 - 1);
85 if (x) {
86 x = 16 - x;
87 xzero(&ido, x);
88 }
89 xwrite(&ido, &ahdr1, sizeof(ahdr1));
90 ahdr0.a.a_data += kh->nsize + x;
91 xseek(&ido, 0);
92 xwrite(&ido, &ahdr0, sizeof(ahdr0));
93 } else {
94 struct kgz_elfhdr ehdr = elfhdr;
95 ehdr.st[KGZ_ST_KGZ_NDATA].st_size = htole32(kh->nsize);
96 ehdr.sh[KGZ_SH_DATA].sh_size =
97 htole32(le32toh(ehdr.sh[KGZ_SH_DATA].sh_size) + kh->nsize);
98 xseek(&ido, 0);
99 xwrite(&ido, &ehdr, sizeof(ehdr));
100 }
101 khle = *kh;
102 khle.dload = htole32(khle.dload);
103 khle.dsize = htole32(khle.dsize);
104 khle.isize = htole32(khle.isize);
105 khle.entry = htole32(khle.entry);
106 khle.nsize = htole32(khle.nsize);
107 xwrite(&ido, &khle, sizeof(khle));
108 xclose(&ido);
109 xclose(&idi);
110 }
111
112 /*
113 * Make encoded (compressed) data.
114 */
115 static void
mk_data(const struct iodesc * idi,const struct iodesc * ido,struct kgz_hdr * kh,size_t off)116 mk_data(const struct iodesc * idi, const struct iodesc * ido,
117 struct kgz_hdr * kh, size_t off)
118 {
119 union {
120 struct exec ex;
121 Elf32_Ehdr ee;
122 } hdr;
123 struct stat sb;
124 struct iodesc idp;
125 int fd[2];
126 pid_t pid;
127 size_t n;
128 int fmt, status, e;
129
130 n = xread(idi, &hdr, sizeof(hdr), 0);
131 fmt = 0;
132 if (n >= sizeof(hdr.ee) && IS_ELF(hdr.ee))
133 fmt = F_ELF;
134 else if (n >= sizeof(hdr.ex) && N_GETMAGIC(hdr.ex) == ZMAGIC)
135 fmt = F_AOUT;
136 if (!fmt)
137 errx(1, "%s: Format not supported", idi->fname);
138 xseek(ido, off);
139 if (pipe(fd))
140 err(1, NULL);
141 switch (pid = fork()) {
142 case -1:
143 err(1, NULL);
144 case 0:
145 close(fd[1]);
146 dup2(fd[0], STDIN_FILENO);
147 close(fd[0]);
148 close(idi->fd);
149 dup2(ido->fd, STDOUT_FILENO);
150 close(ido->fd);
151 execlp("gzip", "gzip", "-9n", (char *)NULL);
152 warn(NULL);
153 _exit(1);
154 default:
155 close(fd[0]);
156 idp.fname = "(pipe)";
157 idp.fd = fd[1];
158 e = fmt == F_ELF ? ld_elf(idi, &idp, kh, &hdr.ee) :
159 fmt == F_AOUT ? ld_aout(idi, &idp, kh, &hdr.ex) : -1;
160 close(fd[1]);
161 if ((pid = waitpid(pid, &status, 0)) == -1)
162 err(1, NULL);
163 if (WIFSIGNALED(status) || WEXITSTATUS(status))
164 exit(1);
165 }
166 if (e)
167 errx(1, "%s: Invalid format", idi->fname);
168 if (fstat(ido->fd, &sb))
169 err(1, "%s", ido->fname);
170 kh->nsize = sb.st_size - off;
171 }
172
173 /*
174 * "Load" an ELF-format executable.
175 */
176 static int
ld_elf(const struct iodesc * idi,const struct iodesc * ido,struct kgz_hdr * kh,const Elf32_Ehdr * e)177 ld_elf(const struct iodesc * idi, const struct iodesc * ido,
178 struct kgz_hdr * kh, const Elf32_Ehdr * e)
179 {
180 Elf32_Phdr p;
181 size_t load, addr, n;
182 unsigned x, i;
183
184 load = addr = n = 0;
185 for (x = i = 0; i < e->e_phnum; i++) {
186 if (xread(idi, &p, sizeof(p),
187 e->e_phoff + i * e->e_phentsize) != e->e_phentsize)
188 return -1;
189 if (p.p_type != PT_LOAD)
190 continue;
191 if (!x)
192 load = addr = p.p_vaddr;
193 else {
194 if (p.p_vaddr < addr)
195 return -1;
196 n = p.p_vaddr - addr;
197 if (n) {
198 xzero(ido, n);
199 addr += n;
200 }
201 }
202 if (p.p_memsz < p.p_filesz)
203 return -1;
204 n = p.p_memsz - p.p_filesz;
205 xcopy(idi, ido, p.p_filesz, p.p_offset);
206 addr += p.p_filesz;
207 x++;
208 }
209 if (!x)
210 return -1;
211 kh->dload = load;
212 kh->dsize = addr - load;
213 kh->isize = kh->dsize + n;
214 kh->entry = e->e_entry;
215 return 0;
216 }
217
218 /*
219 * "Load" an a.out-format executable.
220 */
221 static int
ld_aout(const struct iodesc * idi,const struct iodesc * ido,struct kgz_hdr * kh,const struct exec * a)222 ld_aout(const struct iodesc * idi, const struct iodesc * ido,
223 struct kgz_hdr * kh, const struct exec * a)
224 {
225 size_t load, addr;
226
227 load = addr = N_TXTADDR(*a);
228 xcopy(idi, ido, le32toh(a->a_text), N_TXTOFF(*a));
229 addr += le32toh(a->a_text);
230 if (N_DATADDR(*a) != addr)
231 return -1;
232 xcopy(idi, ido, le32toh(a->a_data), N_DATOFF(*a));
233 addr += le32toh(a->a_data);
234 kh->dload = load;
235 kh->dsize = addr - load;
236 kh->isize = kh->dsize + le32toh(a->a_bss);
237 kh->entry = le32toh(a->a_entry);
238 return 0;
239 }
240