/[gxemul]/trunk/src/disk/bootblock_iso9660.c
This is repository of my old source code which isn't updated any more. Go to git.rot13.org for current projects!
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Contents of /trunk/src/disk/bootblock_iso9660.c

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Revision 36 - (show annotations)
Mon Oct 8 16:21:34 2007 UTC (13 years, 1 month ago) by dpavlin
File MIME type: text/plain
File size: 9781 byte(s)
++ trunk/HISTORY	(local)
$Id: HISTORY,v 1.1497 2007/03/18 03:41:36 debug Exp $
20070224	Minor update to the initialization of the ns16550 in
		machine_walnut.c, to allow that machine type to boot with the
		new interrupt system (although it is still a dummy machine).
		Adding a wdc at 0x14000000 to machine_landisk.c, and fixing
		the SCIF serial interrupts of the SH4 cpu enough to get
		NetBSD/landisk booting from a disk image :-)  Adding a
		preliminary install instruction skeleton to guestoses.html.
20070306	Adding SH-IPL+G PROM emulation, and also passing the "end"
		symbol in r5 on bootup, for Landisk emulation. This is enough
		to get OpenBSD/landisk to install :)  Adding a preliminary
		install instruction skeleton to the documentation. SuperH
		emulation is still shaky, though :-/
20070307	Fixed a strangeness in memory_sh.c (read/write was never
		returned for any page). (Unknown whether this fixes any actual
		problems, though.)
20070308	dev_ram.c fix: invalidate code translations on writes to
		RAM, emulated as separate devices. Linux/dreamcast gets
		further in the boot process than before, but still bugs out
		in userland.
		Fixing bugs in the "stc.l gbr,@-rN" and "ldc.l @rN+,gbr" SuperH 
		instructions (they should NOT check the MD bit), allowing the
		Linux/dreamcast Live CD to reach userland correctly :-)
20070310	Changing the cpu name "Alpha" in src/useremul.c to "21364" to
		unbreak userland syscall emulation of FreeBSD/Alpha binaries.
20070314	Applying a patch from Michael Yaroslavtsev which fixes the
		previous Linux lib64 patch to the configure script.
20070315	Adding a (dummy) sun4v machine type, and SPARC T1 cpu type.
20070316	Creating a new directory, src/disk, and moving diskimage.c
		to it. Separating out bootblock loading stuff from emul.c into
		new files in src/disk.
		Adding some more SPARC registers.
20070318	Preparing/testing for a minirelease, 0.4.4.1.

==============  RELEASE 0.4.4.1  ==============


1 /*
2 * Copyright (C) 2003-2007 Anders Gavare. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are met:
6 *
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * 3. The name of the author may not be used to endorse or promote products
13 * derived from this software without specific prior written permission.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 *
27 *
28 * $Id: bootblock_iso9660.c,v 1.2 2007/03/16 15:17:55 debug Exp $
29 *
30 * ISO9660 CD-ROM "bootblock" handling.
31 *
32 * There is really no bootblock; instead, the file which is to be booted
33 * is extracted into a temporary file, and started as if it was given
34 * as a normal file argument on the command line.
35 *
36 * TODO: This is really ugly. It's a quick hack. All the magic constants
37 * need to be replaced with real code!
38 */
39
40 #include <stdio.h>
41 #include <stdlib.h>
42 #include <string.h>
43 #include <sys/types.h>
44 #include <unistd.h>
45
46 #include "cpu.h"
47 #include "diskimage.h"
48 #include "machine.h"
49 #include "misc.h"
50
51 /* #define ISO_DEBUG */
52
53
54 static void debug_print_volume_id_and_filename(int iso_type,
55 unsigned char *buf, char *filename)
56 {
57 /* Volume ID: */
58 char str[35];
59 int i, ofs = iso_type == 3? 48 : 40;
60
61 memcpy(str, buf + ofs, sizeof(str));
62 str[32] = '\0'; i = 31;
63
64 while (i >= 0 && str[i]==' ')
65 str[i--] = '\0';
66 if (str[0])
67 debug("\"%s\"", str);
68 else {
69 /* System ID: */
70 ofs = iso_type == 3? 16 : 8;
71 memcpy(str, buf + ofs, sizeof(str));
72 str[32] = '\0'; i = 31;
73 while (i >= 0 && str[i]==' ')
74 str[i--] = '\0';
75 if (str[0])
76 debug("\"%s\"", str);
77 else
78 debug("(no ID)");
79 }
80
81 debug(":%s\n", filename);
82 }
83
84
85 /*
86 * iso_load_bootblock():
87 *
88 * Try to load a kernel from an ISO 9660 disk image. iso_type is 1 for
89 * "CD001" (standard), 2 for "CDW01" (ECMA), and 3 for "CDROM" (Sierra).
90 *
91 * TODO: This function uses too many magic offsets and so on; it should be
92 * cleaned up some day.
93 *
94 * Returns 1 on success, 0 on failure.
95 */
96 int iso_load_bootblock(struct machine *m, struct cpu *cpu,
97 int disk_id, int disk_type, int iso_type, unsigned char *buf,
98 int *n_loadp, char ***load_namesp)
99 {
100 int filenr, dirlen, res = 0, res2, iadd = DEBUG_INDENTATION;
101 int found_dir;
102 uint64_t dirofs;
103 uint64_t fileofs, filelen;
104 unsigned char *dirbuf = NULL, *dp;
105 unsigned char *match_entry = NULL;
106 char *p, *filename_orig;
107 char *filename = strdup(cpu->machine->boot_kernel_filename);
108 unsigned char *filebuf = NULL;
109 char *tmpfname = NULL;
110 char **new_array;
111 int tmpfile_handle;
112
113 if (filename == NULL) {
114 fatal("out of memory\n");
115 exit(1);
116 }
117 filename_orig = filename;
118
119 debug("ISO9660 boot:\n");
120 debug_indentation(iadd);
121
122 debug_print_volume_id_and_filename(iso_type, buf, filename);
123
124
125 /*
126 * Traverse the directory structure to find the kernel.
127 */
128
129 dirlen = buf[0x84] + 256*buf[0x85] + 65536*buf[0x86];
130 if (dirlen != buf[0x8b] + 256*buf[0x8a] + 65536*buf[0x89])
131 fatal("WARNING: Root directory length mismatch?\n");
132
133 dirofs = (int64_t)(buf[0x8c] + (buf[0x8d] << 8) + (buf[0x8e] << 16) +
134 ((uint64_t)buf[0x8f] << 24)) * 2048;
135
136 #ifdef ISO_DEBUG
137 debug("root = %i bytes at 0x%llx\n", dirlen, (long long)dirofs);
138 #endif
139
140 dirbuf = malloc(dirlen);
141 if (dirbuf == NULL) {
142 fatal("out of memory in iso_load_bootblock()\n");
143 exit(1);
144 }
145
146 res2 = diskimage_access(m, disk_id, disk_type, 0, dirofs, dirbuf,
147 dirlen);
148 if (!res2) {
149 fatal("Couldn't read the disk image. Aborting.\n");
150 goto ret;
151 }
152
153 found_dir = 1; /* Assume root dir */
154 dp = dirbuf; filenr = 1;
155 p = NULL;
156 while (dp < dirbuf + dirlen) {
157 size_t i, nlen = dp[0];
158 int x = dp[2] + (dp[3] << 8) + (dp[4] << 16) +
159 ((uint64_t)dp[5] << 24);
160 int y = dp[6] + (dp[7] << 8);
161 char direntry[65];
162
163 dp += 8;
164
165 /*
166 * As long as there is an \ or / in the filename, then we
167 * have not yet found the directory.
168 */
169 p = strchr(filename, '/');
170 if (p == NULL)
171 p = strchr(filename, '\\');
172
173 #ifdef ISO_DEBUG
174 debug("%i%s: %i, %i, \"", filenr, filenr == found_dir?
175 " [CURRENT]" : "", x, y);
176 #endif
177 for (i=0; i<nlen && i<sizeof(direntry)-1; i++)
178 if (dp[i]) {
179 direntry[i] = dp[i];
180 #ifdef ISO_DEBUG
181 debug("%c", dp[i]);
182 #endif
183 } else
184 break;
185 #ifdef ISO_DEBUG
186 debug("\"\n");
187 #endif
188 direntry[i] = '\0';
189
190 /* A directory name match? */
191 if ((p != NULL && strncasecmp(filename, direntry, nlen) == 0
192 && nlen == (size_t)p - (size_t)filename && found_dir == y)
193 || (p == NULL && direntry[0] == '\0') ) {
194 found_dir = filenr;
195 if (p != NULL)
196 filename = p+1;
197 dirofs = 2048 * (int64_t)x;
198 }
199
200 dp += nlen;
201
202 /* 16-bit aligned lenght: */
203 if (nlen & 1)
204 dp ++;
205
206 filenr ++;
207 }
208
209 p = strchr(filename, '/');
210 if (p == NULL)
211 p = strchr(filename, '\\');
212
213 if (p != NULL) {
214 char *blah = filename_orig;
215
216 fatal("could not find '%s' in /", filename);
217
218 /* Print the first part of the filename: */
219 while (blah != filename)
220 fatal("%c", *blah++);
221
222 fatal("\n");
223 goto ret;
224 }
225
226 /* debug("dirofs = 0x%llx\n", (long long)dirofs); */
227
228 /* Free the old dirbuf, and allocate a new one: */
229 free(dirbuf);
230 dirbuf = malloc(512);
231 if (dirbuf == NULL) {
232 fatal("out of memory in iso_load_bootblock()\n");
233 exit(1);
234 }
235
236 for (;;) {
237 size_t len, i;
238
239 /* Too close to another sector? Then realign. */
240 if ((dirofs & 2047) + 70 > 2047) {
241 dirofs = (dirofs | 2047) + 1;
242 /* debug("realign dirofs = 0x%llx\n", dirofs); */
243 }
244
245 res2 = diskimage_access(m, disk_id, disk_type, 0, dirofs,
246 dirbuf, 256);
247 if (!res2) {
248 fatal("Couldn't read the disk image. Aborting.\n");
249 goto ret;
250 }
251
252 dp = dirbuf;
253 len = dp[0];
254 if (len < 2)
255 break;
256
257 /*
258 * TODO: Actually parse the directory entry!
259 *
260 * Haha, this must be rewritten.
261 */
262
263 #if 0
264 /* hahahaha */
265 printf("filename = '%s'\n", filename);
266 {
267 int j;
268 for (j=32; j<len; j++)
269 printf("%c", dp[j] >= ' ' && dp[j] < 128? dp[j] : '.');
270 printf("\n");
271 }
272 #endif
273
274 for (i=32; i<len; i++) {
275 if (i < len - strlen(filename))
276 if (strncmp(filename, (char *)dp + i,
277 strlen(filename)) == 0) {
278 /* The filename was found somewhere
279 in the directory entry. */
280 if (match_entry != NULL) {
281 fatal("TODO: I'm too lazy to"
282 " implement a correct "
283 "directory parser right "
284 "now... (BUG)\n");
285 exit(1);
286 }
287 match_entry = malloc(512);
288 if (match_entry == NULL) {
289 fatal("out of memory\n");
290 exit(1);
291 }
292 memcpy(match_entry, dp, 512);
293 break;
294 }
295 }
296
297 if (match_entry != NULL)
298 break;
299
300 dirofs += len;
301 }
302
303 if (match_entry == NULL) {
304 char *blah = filename_orig;
305
306 fatal("could not find '%s' in /", filename);
307
308 /* Print the first part of the filename: */
309 while (blah != filename)
310 fatal("%c", *blah++);
311
312 fatal("\n");
313 goto ret;
314 }
315
316 fileofs = match_entry[2] + (match_entry[3] << 8) +
317 (match_entry[4] << 16) + ((uint64_t)match_entry[5] << 24);
318 filelen = match_entry[10] + (match_entry[11] << 8) +
319 (match_entry[12] << 16) + ((uint64_t)match_entry[13] << 24);
320 fileofs *= 2048;
321
322 /* debug("filelen=%llx fileofs=%llx\n", (long long)filelen,
323 (long long)fileofs); */
324
325 filebuf = malloc(filelen);
326 if (filebuf == NULL) {
327 fatal("could not allocate %lli bytes to read the file"
328 " from the disk image!\n", (long long)filelen);
329 goto ret;
330 }
331
332 tmpfname = strdup("/tmp/gxemul.XXXXXXXXXXXX");
333
334 res2 = diskimage_access(m, disk_id, disk_type, 0, fileofs, filebuf,
335 filelen);
336 if (!res2) {
337 fatal("could not read the file from the disk image!\n");
338 goto ret;
339 }
340
341 tmpfile_handle = mkstemp(tmpfname);
342 if (tmpfile_handle < 0) {
343 fatal("could not create %s\n", tmpfname);
344 exit(1);
345 }
346 write(tmpfile_handle, filebuf, filelen);
347 close(tmpfile_handle);
348
349 debug("extracted %lli bytes into %s\n", (long long)filelen, tmpfname);
350
351 /* Add the temporary filename to the load_namesp array: */
352 (*n_loadp)++;
353 new_array = malloc(sizeof(char *) * (*n_loadp));
354 if (new_array == NULL) {
355 fatal("out of memory\n");
356 exit(1);
357 }
358 memcpy(new_array, *load_namesp, sizeof(char *) * (*n_loadp));
359 *load_namesp = new_array;
360
361 /* This adds a Backspace char in front of the filename; this
362 is a special hack which causes the file to be removed once
363 it has been loaded. */
364 tmpfname = realloc(tmpfname, strlen(tmpfname) + 2);
365 memmove(tmpfname + 1, tmpfname, strlen(tmpfname) + 1);
366 tmpfname[0] = 8;
367
368 (*load_namesp)[*n_loadp - 1] = tmpfname;
369
370 res = 1;
371
372 ret:
373 if (dirbuf != NULL)
374 free(dirbuf);
375
376 if (filebuf != NULL)
377 free(filebuf);
378
379 if (match_entry != NULL)
380 free(match_entry);
381
382 free(filename_orig);
383
384 debug_indentation(-iadd);
385 return res;
386 }
387

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