428
+ − 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>
438
+ − 43 #include <errno.h>
978
+ − 44 #include "syssignal.h"
428
+ − 45 #ifdef __hp9000s300
+ − 46 # include </usr/include/debug.h>
+ − 47 #endif
+ − 48 #include <a.out.h>
+ − 49 #include <unistd.h>
+ − 50 #include <ctype.h>
+ − 51 #include <sys/dir.h>
+ − 52
+ − 53 #include "sysdep.h"
+ − 54
+ − 55 /* XEmacs: Richard Cognot <cognot@ensg.u-nancy.fr> says we need these */
+ − 56 extern void perror(const char*);
+ − 57 extern int sys_nerr;
+ − 58 extern char *sys_errlist[];
+ − 59 extern char *strerror (int);
+ − 60
+ − 61
+ − 62 /********************** Macros *************************************/
+ − 63
+ − 64 #define SYS_ERR \
+ − 65 ((errno > 0)?((errno < sys_nerr)?(sys_errlist[errno]):\
+ − 66 "unknown system error"): "unknown error")
+ − 67
+ − 68 #define MASK_UP(x,p_of_two) \
+ − 69 ((((unsigned long) (x)) + ((p_of_two) - 1)) & (~((p_of_two) - 1)))
+ − 70
+ − 71 #define MASK_DOWN(x,p_of_two) (((unsigned long) (x)) & (~((p_of_two) - 1)))
+ − 72
+ − 73 /********************** Function Prototypes/Declarations ***********/
+ − 74
442
+ − 75 static void unexec_error (const char *fmt, int use_errno, ...);
428
+ − 76 static int unexec_open (char *filename, int flag, int mode);
+ − 77 static long unexec_seek (int fd, long position);
+ − 78 static void unexec_read (int fd, long position, char *buf, int bytes);
+ − 79 static void unexec_write (int fd, long position, char *buf, int bytes);
+ − 80 static void unexec_copy (int new_fd, int old_fd, long old_pos, long new_pos,
+ − 81 int bytes);
+ − 82 static void unexec_pad (int fd, int bytes);
+ − 83 static void unexec_fstat (int fd, struct stat *statptr);
+ − 84 static void unexec_fchmod (int fd, int mode);
+ − 85 int run_time_remap (char *dummy);
+ − 86
+ − 87 /********************** Variables **********************************/
+ − 88
+ − 89 /* for reporting error messages from system calls */
+ − 90 extern int sys_nerr;
+ − 91 extern int _DYNAMIC;
+ − 92 extern char **environ;
+ − 93
+ − 94 static unsigned long sbrk_of_0_at_unexec;
+ − 95
+ − 96 /*******************************************************************/
+ − 97
+ − 98 static void
442
+ − 99 unexec_error (const char *fmt, int use_errno, ...)
428
+ − 100 {
442
+ − 101 const char *err_msg = SYS_ERR;
428
+ − 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 }