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comparison src/unexhp9k3.c @ 428:3ecd8885ac67 r21-2-22

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Import from CVS: tag r21-2-22
author cvs
date Mon, 13 Aug 2007 11:28:15 +0200
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427:0a0253eac470 428:3ecd8885ac67
1 /*
2 * Code to do an unexec for HPUX 8.0 on an HP9000/[34]00 for a
3 * dynamically linked temacs.
4
5 Copyright (C) 1992-1993 Free Software Foundation, Inc.
6
7 This file is part of XEmacs.
8
9 XEmacs is free software; you can redistribute it and/or modify it
10 under the terms of the GNU General Public License as published by the
11 Free Software Foundation; either version 2, or (at your option) any
12 later version.
13
14 XEmacs is distributed in the hope that it will be useful, but WITHOUT
15 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 for more details.
18
19 You should have received a copy of the GNU General Public License
20 along with XEmacs; see the file COPYING. If not, write to
21 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
22 Boston, MA 02111-1307, USA. */
23
24 /* Synched up with: Not in FSF. */
25
26 /*
27 Created 29-Oct-92 by Harlan Sexton for SunOS
28
29 Modified Jan 93 by Hamish Macdonald for HPUX
30 */
31
32 /********************** Included .h Files **************************/
33
34 #include <config.h>
35
36 #include <stdarg.h>
37 #include <sys/param.h>
38 #include <sys/file.h>
39 #include <sys/stat.h>
40 #include <sys/types.h>
41 #include <string.h>
42 #include <stdio.h>
43 #include <signal.h>
44 #ifdef __hp9000s300
45 # include </usr/include/debug.h>
46 #endif
47 #include <a.out.h>
48 #include <unistd.h>
49 #include <ctype.h>
50 #include <sys/dir.h>
51
52 #include "sysdep.h"
53
54 /* XEmacs: Richard Cognot <cognot@ensg.u-nancy.fr> says we need these */
55 extern void perror(const char*);
56 extern int sys_nerr;
57 extern char *sys_errlist[];
58 extern char *strerror (int);
59
60
61 /********************** Macros *************************************/
62
63 #define SYS_ERR \
64 ((errno > 0)?((errno < sys_nerr)?(sys_errlist[errno]):\
65 "unknown system error"): "unknown error")
66
67 #define MASK_UP(x,p_of_two) \
68 ((((unsigned long) (x)) + ((p_of_two) - 1)) & (~((p_of_two) - 1)))
69
70 #define MASK_DOWN(x,p_of_two) (((unsigned long) (x)) & (~((p_of_two) - 1)))
71
72 /********************** Function Prototypes/Declarations ***********/
73
74 static void unexec_error (CONST char *fmt, int use_errno, ...);
75 static int unexec_open (char *filename, int flag, int mode);
76 static long unexec_seek (int fd, long position);
77 static void unexec_read (int fd, long position, char *buf, int bytes);
78 static void unexec_write (int fd, long position, char *buf, int bytes);
79 static void unexec_copy (int new_fd, int old_fd, long old_pos, long new_pos,
80 int bytes);
81 static void unexec_pad (int fd, int bytes);
82 static void unexec_fstat (int fd, struct stat *statptr);
83 static void unexec_fchmod (int fd, int mode);
84 int run_time_remap (char *dummy);
85
86 /********************** Variables **********************************/
87
88 /* for reporting error messages from system calls */
89 extern int sys_nerr;
90 extern int errno;
91 extern int _DYNAMIC;
92 extern char **environ;
93
94 static unsigned long sbrk_of_0_at_unexec;
95
96 /*******************************************************************/
97
98 static void
99 unexec_error (CONST char *fmt, int use_errno, ...)
100 {
101 CONST char *err_msg = SYS_ERR;
102 va_list args;
103
104 fprintf (stderr, "unexec - ");
105 va_start (args, use_errno);
106 vfprintf (stderr, fmt, args);
107 va_end (args);
108
109 if (use_errno)
110 fprintf (stderr, ": %s", err_msg);
111 fprintf (stderr, "\n");
112 exit (1);
113 return;
114 }
115
116 static int
117 unexec_open (char *filename, int flag, int mode)
118 {
119 int fd;
120
121 errno = 0;
122
123 fd = open (filename, flag, mode);
124
125 if (fd < 0)
126 {
127 unexec_error ("Failure opening file %s", 1, (void *) filename, 0, 0);
128 return -1;
129 }
130 else
131 return fd;
132 }
133
134 static long
135 unexec_seek (int fd, long position)
136 {
137 long seek_value;
138
139 if (fd <= 0)
140 unexec_error ("No file open in which to seek", 0, 0, 0, 0);
141
142 errno = 0;
143
144 if (position < 0)
145 seek_value = (long) lseek (fd, 0, L_INCR);
146 else
147 seek_value = (long) lseek (fd, position, L_SET);
148
149 if (seek_value < 0)
150 unexec_error ("Failed to do a seek to 0x%x in %s", 1,
151 (char *) position, "unexec() output file", 0);
152
153 return seek_value;
154 }
155
156 static void
157 unexec_read (int fd, long position, char *buf, int bytes)
158 {
159 int n_read;
160 int remains = bytes;
161 position = unexec_seek (fd, position);
162
163 if (bytes < 0)
164 unexec_error ("Attempted read of %d bytes", 0, (char *) bytes, 0, 0);
165
166 errno = 0;
167
168 while (remains > 0)
169 {
170 n_read = read (fd, buf, remains);
171 if (n_read <= 0)
172 unexec_error ("Read failed for 0x%x bytes at offset 0x%x in %s",
173 1, (char *) bytes, (char *) position,
174 "unexec() output file");
175 buf += n_read;
176 remains -= n_read;
177 }
178
179 return;
180 }
181
182 static void
183 unexec_write (int fd, long position, char *buf, int bytes)
184 {
185 int n_written;
186 int remains = bytes;
187 position = unexec_seek (fd, position);
188
189 if (bytes < 0)
190 unexec_error ("Attempted write of %d bytes in %s",
191 0, (char *) bytes, "unexec() output file", 0);
192
193 errno = 0;
194
195 while (remains > 0)
196 {
197 n_written = write (fd, buf, remains);
198 if (n_written <= 0)
199 unexec_error ("Write failed for 0x%x bytes at offset 0x%x in %s",
200 1, (char *) bytes, (char *) position,
201 "unexec() output file");
202 buf += n_written;
203 remains -= n_written;
204 }
205
206 return;
207 }
208
209 static void
210 unexec_copy (int new_fd, int old_fd, long old_pos, long new_pos, int bytes)
211 {
212 int remains = bytes;
213 char buf[128];
214
215 while (remains > 0)
216 {
217 int n_to_copy = remains > sizeof(buf) ? sizeof(buf) : remains;
218
219 unexec_read (old_fd, old_pos, buf, n_to_copy);
220 unexec_write (new_fd, new_pos, buf, n_to_copy);
221
222 old_pos += n_to_copy;
223 new_pos += n_to_copy;
224 remains -= n_to_copy;
225 }
226
227 return;
228 }
229
230 static void
231 unexec_pad (int fd, int bytes)
232 {
233 if (bytes > 0)
234 {
235 char buf[1024];
236 int remaining = bytes;
237
238 memset (buf, 0, sizeof(buf));
239
240 while (remaining > 0)
241 {
242 int this_write = (remaining > sizeof(buf))?sizeof(buf):remaining;
243 unexec_write (fd, -1, buf, this_write);
244 remaining -= this_write;
245 }
246 }
247 }
248
249 static void
250 unexec_fstat (int fd, struct stat *statptr)
251 {
252 errno = 0;
253 if (-1 == fstat (fd, statptr))
254 unexec_error ("fstat() failed for descriptor %d", 1, (char *) fd, 0, 0);
255 return;
256 }
257
258 static void
259 unexec_fchmod (int fd, int mode)
260 {
261 errno = 0;
262 if (-1 == fchmod (fd, mode))
263 unexec_error ("fchmod() failed for descriptor %d", 1, (char *) fd, 0, 0);
264 return;
265 }
266
267 /*
268 * EXPORTED FUNCTIONS
269 */
270
271 /* this has to be a global variable to prevent the optimizers from
272 * assuming that it can not be 0.
273 */
274 static void *dynamic_addr = (void *) &_DYNAMIC;
275
276 int
277 unexec (char *new_name, char *old_name,
278 unsigned int emacs_edata, unsigned int dummy1, unsigned int dummy2)
279 {
280 /* /dld.sl data */
281 struct dynamic *ld = 0;
282 /* old and new state */
283 int old_fd;
284 int new_fd;
285 struct exec old_hdr;
286 struct exec new_hdr;
287 struct stat old_buf;
288 /* some process specific "constants" */
289 unsigned long n_pagsiz;
290 caddr_t dynamic_beg;
291 caddr_t current_break = (caddr_t) sbrk (0);
292
293 /* dynamically linked image? -- if so, find dld.sl structures */
294 if (dynamic_addr)
295 {
296 ld = (struct dynamic *) dynamic_addr;
297 #ifdef DEBUG
298 printf ("dl_text = %#x\n", ld->text);
299 printf ("dl_data = %#x\n", ld->data);
300 printf ("dl_bss = %#x\n", ld->bss);
301 printf ("dl_end = %#x\n", ld->end);
302 printf ("dl_dmodule = %#x\n", ld->dmodule);
303 printf ("dl_dlt = %#x\n", ld->dlt);
304 printf ("dl_plt = %#x\n", ld->plt);
305 #endif
306 }
307
308 /* open the old and new files, figuring out how big the old one is
309 so that we can map it in */
310 old_fd = unexec_open (old_name, O_RDONLY, 0);
311 new_fd = unexec_open (new_name, O_RDWR | O_CREAT | O_TRUNC, 0666);
312
313 /* setup the header and the statbuf for old_fd */
314 unexec_read (old_fd, 0, (char *) &old_hdr, sizeof (old_hdr));
315 unexec_fstat (old_fd, &old_buf);
316
317 /* set up some important constants */
318 n_pagsiz = EXEC_PAGESIZE;
319
320 /* setup beginning of data to copy from executable */
321 if (ld)
322 dynamic_beg = ld->dmodule;
323 else
324 dynamic_beg = (caddr_t)EXEC_ALIGN (old_hdr.a_text) + old_hdr.a_data;
325
326 /* set up the new exec */
327 new_hdr = old_hdr;
328 new_hdr.a_text = MASK_DOWN (emacs_edata, n_pagsiz);
329 new_hdr.a_data = MASK_UP (current_break, n_pagsiz)
330 - EXEC_ALIGN(new_hdr.a_text);
331 new_hdr.a_bss = 0;
332
333 #ifdef DEBUG
334 printf ("old text %#x\n", old_hdr.a_text);
335 printf ("new text %#x\n", new_hdr.a_text);
336 printf ("old data %#x\n", old_hdr.a_data);
337 printf ("new data %#x\n", new_hdr.a_data);
338 printf ("old bss %#x\n", old_hdr.a_bss);
339 printf ("new bss %#x\n", new_hdr.a_bss);
340 #endif
341
342 /* set up this variable, in case we want to reset "the break"
343 when restarting */
344 sbrk_of_0_at_unexec = ((unsigned long) MASK_UP (current_break, n_pagsiz));
345
346 /* Write out the first approximation to the new file. The sizes of
347 each section will be correct, but there will be a number of
348 corrections that will need to be made. */
349 {
350 long old_datoff = DATA_OFFSET (old_hdr);
351 long new_datoff = DATA_OFFSET (new_hdr);
352 long old_dataddr = EXEC_ALIGN (old_hdr.a_text);
353 long new_dataddr = EXEC_ALIGN (new_hdr.a_text);
354 long new_mcaloff = MODCAL_OFFSET (new_hdr);
355 long old_mcaloff = MODCAL_OFFSET (old_hdr);
356 long newtext_size = new_hdr.a_text - old_dataddr;
357 long newdata1_size = (unsigned long)dynamic_beg - new_dataddr;
358 long dyn_size = (EXEC_ALIGN (old_hdr.a_text) + old_hdr.a_data)
359 - (unsigned long)dynamic_beg;
360 long newdata2_size = (unsigned long)current_break
361 - ((unsigned long)dynamic_beg + dyn_size);
362 long pad_size =
363 MASK_UP (current_break, n_pagsiz) - ((unsigned long) current_break);
364
365 #ifdef DEBUG
366 printf ("current break is %#lx\n", current_break);
367
368 printf ("old_dataddr = %#lx, dynamic_beg = %#lx\n",
369 old_dataddr, dynamic_beg);
370 #endif
371
372 /*
373 * First, write the text segment with new header -- copy
374 * everything until the start of the data segment from the old
375 * file
376 */
377 #ifdef DEBUG
378 printf ("copying %#lx bytes of text from 0\n", old_datoff);
379 #endif
380 unexec_copy (new_fd, old_fd, 0, 0, old_datoff);
381 /* pad out the text segment */
382 #ifdef DEBUG
383 printf ( "text pad size is %#x\n", old_dataddr - old_hdr.a_text);
384 #endif
385 unexec_pad (new_fd, old_dataddr - old_hdr.a_text);
386
387 /*
388 * Update debug header spoo
389 */
390 if (new_hdr.a_extension > 0)
391 {
392 new_hdr.a_extension += LESYM_OFFSET(new_hdr) - LESYM_OFFSET(old_hdr);
393 }
394
395 /*
396 * go back and write the new header.
397 */
398 unexec_write (new_fd, 0, (char *) &new_hdr, sizeof (new_hdr));
399
400
401 /*
402 * Copy the part of the data segment which becomes text from the
403 * running image.
404 */
405 #ifdef DEBUG
406 printf ("copying %#lx bytes of new text from %#lx to position %#lx\n",
407 newtext_size, old_dataddr, TEXT_OFFSET(new_hdr) + old_dataddr);
408 #endif
409 unexec_write (new_fd, TEXT_OFFSET(new_hdr) + old_dataddr,
410 (caddr_t)old_dataddr, newtext_size);
411
412 #ifdef DEBUG
413 printf ("new DATA_OFFSET is %#lx\n", new_datoff);
414 #endif
415
416 /*
417 * Copy the part of the old data segment which will be data
418 * in the new executable (before the dynamic stuff)
419 * from the running image.
420 */
421 #ifdef DEBUG
422 printf ("copying %#lx bytes of data from %#lx to position %#lx\n",
423 newdata1_size, new_dataddr, new_datoff);
424 #endif
425 unexec_write (new_fd, new_datoff, (caddr_t)new_dataddr, newdata1_size);
426
427 /* copy the dynamic part of the data segment from the old executable */
428 if (dyn_size)
429 {
430 #ifdef DEBUG
431 printf ("copying %#lx bytes of dyn data from executable"
432 " at address %#lx to position %#lx\n",
433 dyn_size, dynamic_beg, new_datoff + newdata1_size);
434 #endif
435 unexec_copy (new_fd, old_fd, old_datoff + newtext_size + newdata1_size,
436 new_datoff + newdata1_size, dyn_size);
437 }
438
439 /* copy remaining data (old bss) from the running image */
440 #ifdef DEBUG
441 printf ("copying %#lx bytes of data from %#lx to position %#lx\n",
442 newdata2_size, new_dataddr + newdata1_size + dyn_size,
443 new_datoff + newdata1_size + dyn_size);
444 #endif
445 unexec_write (new_fd, new_datoff + newdata1_size + dyn_size,
446 (caddr_t)(new_dataddr + newdata1_size + dyn_size),
447 newdata2_size);
448
449 /* pad out the data segment */
450 #ifdef DEBUG
451 printf ( "pad size is %#x\n", pad_size);
452 #endif
453 unexec_pad (new_fd, pad_size);
454
455 /* Finally, copy the rest of the junk from the old file. */
456 #ifdef DEBUG
457 printf ("Copying %#lx bytes of junk from %#lx (old) to %#lx (new)\n",
458 old_buf.st_size - old_mcaloff, old_mcaloff, new_mcaloff);
459 #endif
460 unexec_copy (new_fd, old_fd, old_mcaloff, new_mcaloff,
461 old_buf.st_size - old_mcaloff);
462
463 {
464 long curpos, offset;
465 struct _debug_header dhdr;
466 int new_header_delta;
467
468 new_header_delta = LESYM_OFFSET(new_hdr) - LESYM_OFFSET(old_hdr);
469 if ((new_header_delta > 0) &&
470 ((offset = EXT_OFFSET(old_hdr)) > 0))
471 {
472 curpos = lseek(new_fd, 0, SEEK_CUR);
473 lseek(old_fd, offset, 0);
474 if (read(old_fd, &dhdr, sizeof(dhdr)) == sizeof(dhdr))
475 {
476 dhdr.header_offset += new_header_delta;
477 dhdr.gntt_offset += new_header_delta;
478 dhdr.lntt_offset += new_header_delta;
479 dhdr.slt_offset += new_header_delta;
480 dhdr.vt_offset += new_header_delta;
481 dhdr.xt_offset += new_header_delta;
482 lseek(new_fd, EXT_OFFSET(new_hdr), SEEK_SET);
483 if (write(new_fd, &dhdr, sizeof(dhdr)) != sizeof(dhdr))
484 {
485 unexec_error("Unable to write debug information to \"%s\"\n",
486 1, new_name);
487 }
488 lseek(new_fd, curpos, SEEK_SET);
489 }
490 else
491 {
492 unexec_error("Unable to read debug information from \"%s\"\n",
493 1, old_name);
494 }
495 }
496 }
497 }
498
499
500 /* make the output file executable -- then quit */
501 unexec_fchmod (new_fd, 0755);
502 close (old_fd);
503 close (new_fd);
504 return 0;
505 }
506
507
508 int
509 run_time_remap (char *dummy)
510 {
511 unsigned long current_sbrk = (unsigned long) sbrk (0);
512
513 if (sbrk_of_0_at_unexec < current_sbrk)
514 fprintf (stderr, "Absurd new brk addr = 0x%x (current = 0x%x)\n",
515 sbrk_of_0_at_unexec, current_sbrk);
516 else
517 {
518 errno = 0;
519 if (brk ((caddr_t) sbrk_of_0_at_unexec))
520 fprintf (stderr, "failed to change brk addr to 0x%x: %s\n",
521 sbrk_of_0_at_unexec, SYS_ERR);
522 }
523
524 return 0;
525 }