Mercurial > hg > xemacs-beta
annotate src/unexaix.c @ 5159:cb303ff63e76
merge
| author | Ben Wing <ben@xemacs.org> |
|---|---|
| date | Fri, 19 Mar 2010 17:02:11 -0500 |
| parents | 304aebb79cd3 |
| children | 308d34e9f07d |
| rev | line source |
|---|---|
| 428 | 1 /* Dump an executable image. |
| 2 Copyright (C) 1985, 1986, 1987, 1988 Free Software Foundation, Inc. | |
| 3 | |
| 4 This file is part of XEmacs. | |
| 5 | |
| 6 XEmacs is free software; you can redistribute it and/or modify it | |
| 7 under the terms of the GNU General Public License as published by the | |
| 8 Free Software Foundation; either version 2, or (at your option) any | |
| 9 later version. | |
| 10 | |
| 11 XEmacs is distributed in the hope that it will be useful, but WITHOUT | |
| 12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 for more details. | |
| 15 | |
| 16 You should have received a copy of the GNU General Public License | |
| 17 along with XEmacs; see the file COPYING. If not, write to | |
| 18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
| 19 Boston, MA 02111-1307, USA. */ | |
| 20 | |
| 21 /* Synched up with: FSF 20.2. */ | |
| 22 | |
| 771 | 23 /* This file has been ... uhhhhh ... Mule-ized. Yeah. |
| 24 | |
| 25 (Everything here is external format. That's potentially dangerous, | |
| 26 but in practice it'll be OK.) --ben */ | |
| 27 | |
| 428 | 28 /* Originally based on the COFF unexec.c by Spencer W. Thomas. |
| 29 * | |
| 30 * Subsequently hacked on by | |
| 31 * Bill Mann <Bill_Man@praxisint.com> | |
| 32 * Andrew Vignaux <Andrew.Vignaux@comp.vuw.ac.nz> | |
| 33 * Mike Sperber <sperber@informatik.uni-tuebingen.de> | |
| 34 * | |
| 35 * Synopsis: | |
| 36 * unexec (new_name, a_name, data_start, bss_start, entry_address) | |
| 37 * char *new_name, *a_name; | |
| 38 * unsigned data_start, bss_start, entry_address; | |
| 39 * | |
| 40 * Takes a snapshot of the program and makes an a.out format file in the | |
| 41 * file named by the string argument new_name. | |
| 42 * If a_name is non-NULL, the symbol table will be taken from the given file. | |
| 43 * On some machines, an existing a_name file is required. | |
| 44 * | |
| 45 * data_start and entry_address are ignored. | |
| 46 * | |
| 47 * bss_start indicates how much of the data segment is to be saved in the | |
| 48 * a.out file and restored when the program is executed. It gives the lowest | |
| 49 * unsaved address, and is rounded up to a page boundary. The default when 0 | |
| 50 * is given assumes that the entire data segment is to be stored, including | |
| 51 * the previous data and bss as well as any additional storage allocated with | |
| 52 * sbrk(2). | |
| 53 * | |
| 54 */ | |
| 55 | |
| 56 #ifndef emacs | |
| 57 #define PERROR(arg) perror (arg); return -1 | |
| 58 #else | |
| 59 #include <config.h> | |
| 3025 | 60 #define PERROR(file) report_error (file, new_) |
| 428 | 61 #endif |
| 62 | |
| 63 #include <a.out.h> | |
| 64 /* Define getpagesize () if the system does not. | |
| 65 Note that this may depend on symbols defined in a.out.h | |
| 66 */ | |
| 67 #include "getpagesize.h" | |
| 68 | |
| 69 #include <sys/types.h> | |
| 70 #include <stdio.h> | |
| 71 #include <sys/stat.h> | |
| 72 #include <errno.h> | |
| 73 #include <unistd.h> | |
| 74 #include <fcntl.h> | |
| 75 | |
| 76 extern char *start_of_text (void); /* Start of text */ | |
| 77 extern char *start_of_data (void); /* Start of initialized data */ | |
| 78 | |
| 79 extern int _data; | |
| 80 extern int _text; | |
| 81 | |
| 82 #include <filehdr.h> | |
| 83 #include <aouthdr.h> | |
| 84 #include <scnhdr.h> | |
| 85 #include <syms.h> | |
| 86 | |
| 87 static struct filehdr f_hdr; /* File header */ | |
| 88 static struct aouthdr f_ohdr; /* Optional file header (a.out) */ | |
| 89 static long bias; /* Bias to add for growth */ | |
| 90 static long lnnoptr; /* Pointer to line-number info within file */ | |
| 91 | |
| 92 static long text_scnptr; | |
| 93 static long data_scnptr; | |
| 94 #define ALIGN(val, pwr) (((val) + ((1L<<(pwr))-1)) & ~((1L<<(pwr))-1)) | |
| 95 static long load_scnptr; | |
| 96 static long orig_load_scnptr; | |
| 97 static long orig_data_scnptr; | |
| 98 static int unrelocate_symbols (int, int, char *, char *); | |
| 99 | |
| 100 #ifndef MAX_SECTIONS | |
| 101 #define MAX_SECTIONS 10 | |
| 102 #endif | |
| 103 | |
| 104 static int adjust_lnnoptrs (int, int, char *); | |
| 105 | |
| 106 static int pagemask; | |
| 107 | |
| 108 /* Correct an int which is the bit pattern of a pointer to a byte | |
| 109 into an int which is the number of a byte. | |
| 110 This is a no-op on ordinary machines, but not on all. */ | |
| 111 | |
| 112 #ifndef ADDR_CORRECT /* Let m-*.h files override this definition */ | |
| 113 #define ADDR_CORRECT(x) ((char *)(x) - (char*)0) | |
| 114 #endif | |
| 115 | |
| 116 #ifdef emacs | |
| 117 #include "lisp.h" | |
| 118 | |
| 119 static void | |
| 120 report_error (char *file, int fd) | |
| 121 { | |
| 122 if (fd) | |
| 123 close (fd); | |
| 563 | 124 report_error_with_errno (Qio_error, "Cannot unexec", |
|
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|
125 build_cistring (file)); |
| 428 | 126 } |
| 127 #endif /* emacs */ | |
| 128 | |
| 3025 | 129 #define ERROR0(msg) report_error_1 (new_, msg, 0, 0); return -1 |
| 130 #define ERROR1(msg,x) report_error_1 (new_, msg, x, 0); return -1 | |
| 131 #define ERROR2(msg,x,y) report_error_1 (new_, msg, x, y); return -1 | |
| 428 | 132 |
| 133 static void | |
| 134 report_error_1 (int fd, char *msg, int a1, int a2) | |
| 135 { | |
| 136 close (fd); | |
| 137 #ifdef emacs | |
| 563 | 138 signal_ferror (Qio_error, msg, a1, a2); |
| 428 | 139 #else |
| 140 fprintf (stderr, msg, a1, a2); | |
| 141 fprintf (stderr, "\n"); | |
| 142 #endif | |
| 143 } | |
| 144 | |
| 145 static int make_hdr (int, int, unsigned, unsigned, unsigned, char *, char *); | |
| 146 static void mark_x (char *); | |
| 147 static int copy_text_and_data (int); | |
| 148 static int copy_sym (int, int, char *, char *); | |
| 149 static void write_segment (int, char *, char *); | |
| 150 | |
| 151 /* **************************************************************** | |
| 152 * unexec | |
| 153 * | |
| 154 * driving logic. | |
| 155 */ | |
| 156 int unexec (char *new_name, char *a_name, | |
| 157 uintptr_t data_start, | |
| 158 uintptr_t bss_start, | |
| 159 uintptr_t entry_address) | |
| 160 { | |
| 3025 | 161 int new_ = -1, a_out = -1; |
| 428 | 162 |
| 163 if (a_name && (a_out = open (a_name, O_RDONLY)) < 0) | |
| 164 { | |
| 165 PERROR (a_name); | |
| 166 } | |
| 3025 | 167 if ((new_ = creat (new_name, 0666)) < 0) |
| 428 | 168 { |
| 169 PERROR (new_name); | |
| 170 } | |
| 3025 | 171 if (make_hdr (new_, a_out, |
| 428 | 172 data_start, bss_start, |
| 173 entry_address, | |
| 174 a_name, new_name) < 0 | |
| 3025 | 175 || copy_text_and_data (new_) < 0 |
| 176 || copy_sym (new_, a_out, a_name, new_name) < 0 | |
| 177 || adjust_lnnoptrs (new_, a_out, new_name) < 0 | |
| 178 || unrelocate_symbols (new_, a_out, a_name, new_name) < 0) | |
| 428 | 179 { |
| 3025 | 180 close (new_); |
| 428 | 181 return -1; |
| 182 } | |
| 183 | |
| 3025 | 184 close (new_); |
| 428 | 185 if (a_out >= 0) |
| 186 close (a_out); | |
| 187 mark_x (new_name); | |
| 188 return 0; | |
| 189 } | |
| 190 | |
| 191 /* **************************************************************** | |
| 192 * make_hdr | |
| 193 * | |
| 194 * Make the header in the new a.out from the header in core. | |
| 195 * Modify the text and data sizes. | |
| 196 */ | |
| 197 static int | |
| 3025 | 198 make_hdr (int new_, int a_out, |
| 428 | 199 unsigned data_start, unsigned bss_start, |
| 2286 | 200 unsigned UNUSED (entry_address), |
| 428 | 201 char *a_name, char *new_name) |
| 202 { | |
| 203 int scns; | |
| 204 unsigned int bss_end; | |
| 205 | |
| 206 struct scnhdr section[MAX_SECTIONS]; | |
| 207 struct scnhdr * f_thdr; /* Text section header */ | |
| 208 struct scnhdr * f_dhdr; /* Data section header */ | |
| 209 struct scnhdr * f_bhdr; /* Bss section header */ | |
| 210 struct scnhdr * f_lhdr; /* Loader section header */ | |
| 211 struct scnhdr * f_tchdr; /* Typechk section header */ | |
| 212 struct scnhdr * f_dbhdr; /* Debug section header */ | |
| 213 struct scnhdr * f_xhdr; /* Except section header */ | |
| 214 | |
| 215 load_scnptr = orig_load_scnptr = lnnoptr = 0; | |
| 216 pagemask = getpagesize () - 1; | |
| 217 | |
| 218 /* Adjust text/data boundary. */ | |
| 219 data_start = (long) start_of_data (); | |
| 220 data_start = ADDR_CORRECT (data_start); | |
| 221 | |
| 222 data_start = data_start & ~pagemask; /* (Down) to page boundary. */ | |
| 223 | |
| 224 bss_end = ADDR_CORRECT (sbrk (0)) + pagemask; | |
| 225 bss_end &= ~ pagemask; | |
| 226 /* Adjust data/bss boundary. */ | |
| 227 if (bss_start != 0) | |
| 228 { | |
| 229 bss_start = (ADDR_CORRECT (bss_start) + pagemask); | |
| 230 /* (Up) to page bdry. */ | |
| 231 bss_start &= ~ pagemask; | |
| 232 if (bss_start > bss_end) | |
| 233 { | |
| 234 ERROR1 ("unexec: Specified bss_start (%u) is past end of program", | |
| 235 bss_start); | |
| 236 } | |
| 237 } | |
| 238 else | |
| 239 bss_start = bss_end; | |
| 240 | |
| 241 if (data_start > bss_start) /* Can't have negative data size. */ | |
| 242 { | |
| 243 ERROR2 ("unexec: data_start (%u) can't be greater than bss_start (%u)", | |
| 244 data_start, bss_start); | |
| 245 } | |
| 246 | |
| 247 /* Salvage as much info from the existing file as possible */ | |
| 248 f_thdr = NULL; f_dhdr = NULL; f_bhdr = NULL; | |
| 249 f_lhdr = NULL; f_tchdr = NULL; f_dbhdr = NULL; f_xhdr = NULL; | |
| 250 if (a_out >= 0) | |
| 251 { | |
| 252 if (read (a_out, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) | |
| 253 { | |
| 254 PERROR (a_name); | |
| 255 } | |
| 256 if (f_hdr.f_opthdr > 0) | |
| 257 { | |
| 258 if (read (a_out, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) | |
| 259 { | |
| 260 PERROR (a_name); | |
| 261 } | |
| 262 } | |
| 263 if (f_hdr.f_nscns > MAX_SECTIONS) | |
| 264 { | |
| 265 ERROR0 ("unexec: too many section headers -- increase MAX_SECTIONS"); | |
| 266 } | |
| 267 /* Loop through section headers */ | |
| 268 for (scns = 0; scns < f_hdr.f_nscns; scns++) { | |
| 269 struct scnhdr *s = §ion[scns]; | |
| 270 if (read (a_out, s, sizeof (*s)) != sizeof (*s)) | |
| 271 { | |
| 272 PERROR (a_name); | |
| 273 } | |
| 274 | |
| 275 #define CHECK_SCNHDR(ptr, name, flags) \ | |
| 276 if (strcmp(s->s_name, name) == 0) { \ | |
| 277 if (s->s_flags != flags) { \ | |
| 278 fprintf(stderr, "unexec: %lx flags where %x expected in %s section.\n", \ | |
| 279 (unsigned long)s->s_flags, flags, name); \ | |
| 280 } \ | |
| 281 if (ptr) { \ | |
| 282 fprintf(stderr, "unexec: duplicate section header for section %s.\n", \ | |
| 283 name); \ | |
| 284 } \ | |
| 285 ptr = s; \ | |
| 286 } | |
| 287 CHECK_SCNHDR(f_thdr, _TEXT, STYP_TEXT); | |
| 288 CHECK_SCNHDR(f_dhdr, _DATA, STYP_DATA); | |
| 289 CHECK_SCNHDR(f_bhdr, _BSS, STYP_BSS); | |
| 290 CHECK_SCNHDR(f_lhdr, _LOADER, STYP_LOADER); | |
| 291 CHECK_SCNHDR(f_dbhdr, _DEBUG, STYP_DEBUG); | |
| 292 CHECK_SCNHDR(f_tchdr, _TYPCHK, STYP_TYPCHK); | |
| 293 CHECK_SCNHDR(f_xhdr, _EXCEPT, STYP_EXCEPT); | |
| 294 } | |
| 295 | |
| 296 if (f_thdr == 0) | |
| 297 { | |
| 298 ERROR1 ("unexec: couldn't find \"%s\" section", (int) _TEXT); | |
| 299 } | |
| 300 if (f_dhdr == 0) | |
| 301 { | |
| 302 ERROR1 ("unexec: couldn't find \"%s\" section", (int) _DATA); | |
| 303 } | |
| 304 if (f_bhdr == 0) | |
| 305 { | |
| 306 ERROR1 ("unexec: couldn't find \"%s\" section", (int) _BSS); | |
| 307 } | |
| 308 } | |
| 309 else | |
| 310 { | |
| 311 ERROR0 ("can't build a COFF file from scratch yet"); | |
| 312 } | |
| 313 orig_data_scnptr = f_dhdr->s_scnptr; | |
| 314 orig_load_scnptr = f_lhdr ? f_lhdr->s_scnptr : 0; | |
| 315 | |
| 316 /* Now we alter the contents of all the f_*hdr variables | |
| 317 to correspond to what we want to dump. */ | |
| 318 | |
| 319 /* Indicate that the reloc information is no longer valid for ld (bind); | |
| 320 we only update it enough to fake out the exec-time loader. */ | |
| 321 f_hdr.f_flags |= (F_RELFLG | F_EXEC); | |
| 322 | |
| 323 f_ohdr.dsize = bss_start - f_ohdr.data_start; | |
| 324 f_ohdr.bsize = bss_end - bss_start; | |
| 325 | |
| 326 f_dhdr->s_size = f_ohdr.dsize; | |
| 327 f_bhdr->s_size = f_ohdr.bsize; | |
| 328 f_bhdr->s_paddr = f_ohdr.data_start + f_ohdr.dsize; | |
| 329 f_bhdr->s_vaddr = f_ohdr.data_start + f_ohdr.dsize; | |
| 330 | |
| 331 /* fix scnptr's */ | |
| 332 { | |
| 333 ulong ptr = section[0].s_scnptr; | |
| 334 | |
| 335 bias = -1; | |
| 336 for (scns = 0; scns < f_hdr.f_nscns; scns++) | |
| 337 { | |
| 338 struct scnhdr *s = §ion[scns]; | |
| 339 | |
| 340 if (s->s_flags & STYP_PAD) /* .pad sections omitted in AIX 4.1 */ | |
| 341 { | |
| 342 /* | |
| 343 * the text_start should probably be o_algntext but that doesn't | |
| 344 * seem to change | |
| 345 */ | |
| 346 if (f_ohdr.text_start != 0) /* && scns != 0 */ | |
| 347 { | |
| 348 s->s_size = 512 - (ptr % 512); | |
| 349 if (s->s_size == 512) | |
| 350 s->s_size = 0; | |
| 351 } | |
| 352 s->s_scnptr = ptr; | |
| 353 } | |
| 354 else if (s->s_flags & STYP_DATA) | |
| 355 s->s_scnptr = ptr; | |
| 356 else if (!(s->s_flags & (STYP_TEXT | STYP_BSS))) | |
| 357 { | |
| 358 if (bias == -1) /* if first section after bss */ | |
| 359 bias = ptr - s->s_scnptr; | |
| 360 | |
| 361 s->s_scnptr += bias; | |
| 362 ptr = s->s_scnptr; | |
| 363 } | |
| 364 | |
| 365 ptr = ptr + s->s_size; | |
| 366 } | |
| 367 } | |
| 368 | |
| 369 /* fix other pointers */ | |
| 370 for (scns = 0; scns < f_hdr.f_nscns; scns++) | |
| 371 { | |
| 372 struct scnhdr *s = §ion[scns]; | |
| 373 | |
| 374 if (s->s_relptr != 0) | |
| 375 { | |
| 376 s->s_relptr += bias; | |
| 377 } | |
| 378 if (s->s_lnnoptr != 0) | |
| 379 { | |
| 380 if (lnnoptr == 0) lnnoptr = s->s_lnnoptr; | |
| 381 s->s_lnnoptr += bias; | |
| 382 } | |
| 383 } | |
| 384 | |
| 385 if (f_hdr.f_symptr > 0L) | |
| 386 { | |
| 387 f_hdr.f_symptr += bias; | |
| 388 } | |
| 389 | |
| 390 text_scnptr = f_thdr->s_scnptr; | |
| 391 data_scnptr = f_dhdr->s_scnptr; | |
| 392 load_scnptr = f_lhdr ? f_lhdr->s_scnptr : 0; | |
| 393 | |
| 3025 | 394 if (write (new_, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) |
| 428 | 395 { |
| 396 PERROR (new_name); | |
| 397 } | |
| 398 | |
| 399 if (f_hdr.f_opthdr > 0) | |
| 400 { | |
| 3025 | 401 if (write (new_, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) |
| 428 | 402 { |
| 403 PERROR (new_name); | |
| 404 } | |
| 405 } | |
| 406 | |
| 407 for (scns = 0; scns < f_hdr.f_nscns; scns++) { | |
| 408 struct scnhdr *s = §ion[scns]; | |
| 3025 | 409 if (write (new_, s, sizeof (*s)) != sizeof (*s)) |
| 428 | 410 { |
| 411 PERROR (new_name); | |
| 412 } | |
| 413 } | |
| 414 | |
| 415 return (0); | |
| 416 } | |
| 417 | |
| 418 /* **************************************************************** | |
| 419 | |
| 420 * | |
| 421 * Copy the text and data segments from memory to the new a.out | |
| 422 */ | |
| 423 static int | |
| 3025 | 424 copy_text_and_data (int new_) |
| 428 | 425 { |
| 426 char *end; | |
| 427 char *ptr; | |
| 428 | |
| 3025 | 429 lseek (new_, (long) text_scnptr, SEEK_SET); |
| 428 | 430 ptr = start_of_text () + text_scnptr; |
| 431 end = ptr + f_ohdr.tsize; | |
| 3025 | 432 write_segment (new_, ptr, end); |
| 428 | 433 |
| 3025 | 434 lseek (new_, (long) data_scnptr, SEEK_SET); |
| 428 | 435 ptr = (char *) f_ohdr.data_start; |
| 436 end = ptr + f_ohdr.dsize; | |
| 3025 | 437 write_segment (new_, ptr, end); |
| 428 | 438 |
| 439 return 0; | |
| 440 } | |
| 441 | |
| 442 #define UnexBlockSz (1<<12) /* read/write block size */ | |
| 443 static void | |
| 3025 | 444 write_segment (int new_, char *ptr, char *end) |
| 428 | 445 { |
| 446 int i, nwrite, ret; | |
| 447 char buf[80]; | |
| 448 char zeros[UnexBlockSz]; | |
| 449 | |
| 450 for (i = 0; ptr < end;) | |
| 451 { | |
| 452 /* distance to next block. */ | |
| 453 nwrite = (((int) ptr + UnexBlockSz) & -UnexBlockSz) - (int) ptr; | |
| 454 /* But not beyond specified end. */ | |
| 455 if (nwrite > end - ptr) nwrite = end - ptr; | |
| 3025 | 456 ret = write (new_, ptr, nwrite); |
| 428 | 457 /* If write gets a page fault, it means we reached |
| 458 a gap between the old text segment and the old data segment. | |
| 459 This gap has probably been remapped into part of the text segment. | |
| 460 So write zeros for it. */ | |
| 461 if (ret == -1 && errno == EFAULT) | |
| 462 { | |
| 463 memset (zeros, 0, nwrite); | |
| 3025 | 464 write (new_, zeros, nwrite); |
| 428 | 465 } |
| 466 else if (nwrite != ret) | |
| 467 { | |
| 468 sprintf (buf, | |
| 469 "unexec write failure: addr 0x%lx, fileno %d, size 0x%x, wrote 0x%x, errno %d", | |
| 3025 | 470 (unsigned long)ptr, new_, nwrite, ret, errno); |
| 428 | 471 PERROR (buf); |
| 472 } | |
| 473 i += nwrite; | |
| 474 ptr += nwrite; | |
| 475 } | |
| 476 } | |
| 477 | |
| 478 /* **************************************************************** | |
| 479 * copy_sym | |
| 480 * | |
| 481 * Copy the relocation information and symbol table from the a.out to the new | |
| 482 */ | |
| 483 static int | |
| 3025 | 484 copy_sym (int new_, int a_out, char *a_name, char *new_name) |
| 428 | 485 { |
| 486 char page[UnexBlockSz]; | |
| 487 int n; | |
| 488 | |
| 489 if (a_out < 0) | |
| 490 return 0; | |
| 491 | |
| 492 if (orig_load_scnptr == 0L) | |
| 493 return 0; | |
| 494 | |
| 495 if (lnnoptr && lnnoptr < orig_load_scnptr) /* if there is line number info */ | |
| 496 lseek (a_out, lnnoptr, SEEK_SET); /* start copying from there */ | |
| 497 else | |
| 498 lseek (a_out, orig_load_scnptr, SEEK_SET); /* Position a.out to symtab. */ | |
| 499 | |
| 647 | 500 while ((n = read (a_out, page, sizeof (page))) > 0) |
| 428 | 501 { |
| 3025 | 502 if (write (new_, page, n) != n) |
| 428 | 503 { |
| 504 PERROR (new_name); | |
| 505 } | |
| 506 } | |
| 507 if (n < 0) | |
| 508 { | |
| 509 PERROR (a_name); | |
| 510 } | |
| 511 return 0; | |
| 512 } | |
| 513 | |
| 514 /* **************************************************************** | |
| 515 * mark_x | |
| 516 * | |
| 517 * After successfully building the new a.out, mark it executable | |
| 518 */ | |
| 519 static void | |
| 520 mark_x (char *name) | |
| 521 { | |
| 522 struct stat sbuf; | |
| 523 int um; | |
| 3025 | 524 int new_ = 0; /* for PERROR */ |
| 428 | 525 |
| 526 um = umask (777); | |
| 527 umask (um); | |
| 528 if (stat (name, &sbuf) == -1) | |
| 529 { | |
| 530 PERROR (name); | |
| 531 } | |
| 532 sbuf.st_mode |= 0111 & ~um; | |
| 533 if (chmod (name, sbuf.st_mode) == -1) | |
| 534 PERROR (name); | |
| 535 } | |
| 536 | |
| 537 static int | |
| 2286 | 538 adjust_lnnoptrs (int UNUSED (writedesc), int UNUSED (readdesc), char *new_name) |
| 428 | 539 { |
| 540 int nsyms; | |
| 541 int naux; | |
| 3025 | 542 int new_; |
| 428 | 543 struct syment symentry; |
| 544 union auxent auxentry; | |
| 545 | |
| 546 if (!lnnoptr || !f_hdr.f_symptr) | |
| 547 return 0; | |
| 548 | |
| 3025 | 549 if ((new_ = open (new_name, O_RDWR)) < 0) |
| 428 | 550 { |
| 551 PERROR (new_name); | |
| 552 return -1; | |
| 553 } | |
| 554 | |
| 3025 | 555 lseek (new_, f_hdr.f_symptr, SEEK_SET); |
| 428 | 556 for (nsyms = 0; nsyms < f_hdr.f_nsyms; nsyms++) |
| 557 { | |
| 3025 | 558 read (new_, &symentry, SYMESZ); |
| 428 | 559 if (symentry.n_sclass == C_BINCL || symentry.n_sclass == C_EINCL) |
| 560 { | |
| 561 symentry.n_value += bias; | |
| 3025 | 562 lseek (new_, -SYMESZ, SEEK_CUR); |
| 563 write (new_, &symentry, SYMESZ); | |
| 428 | 564 } |
| 565 | |
| 566 for (naux = symentry.n_numaux; naux-- != 0; ) | |
| 567 { | |
| 3025 | 568 read (new_, &auxentry, AUXESZ); |
| 428 | 569 nsyms++; |
| 570 if (naux != 0 /* skip csect auxentry (last entry) */ | |
| 571 && (symentry.n_sclass == C_EXT || symentry.n_sclass == C_HIDEXT)) | |
| 572 { | |
| 573 auxentry.x_sym.x_fcnary.x_fcn.x_lnnoptr += bias; | |
| 3025 | 574 lseek (new_, -AUXESZ, SEEK_CUR); |
| 575 write (new_, &auxentry, AUXESZ); | |
| 428 | 576 } |
| 577 } | |
| 578 } | |
| 3025 | 579 close (new_); |
| 428 | 580 |
| 581 return 0; | |
| 582 } | |
| 583 | |
| 584 static int | |
| 3025 | 585 unrelocate_symbols (int new_, int a_out, char *a_name, char *new_name) |
| 428 | 586 { |
| 587 int i; | |
| 588 LDHDR ldhdr; | |
| 589 LDREL ldrel; | |
| 590 ulong t_reloc = (ulong) &_text - f_ohdr.text_start; | |
| 591 ulong d_reloc = (ulong) &_data - f_ohdr.data_start; | |
| 592 int * p; | |
| 593 | |
| 594 if (load_scnptr == 0) | |
| 595 return 0; | |
| 596 | |
| 597 lseek (a_out, orig_load_scnptr, SEEK_SET); | |
| 598 if (read (a_out, &ldhdr, sizeof (ldhdr)) != sizeof (ldhdr)) | |
| 599 { | |
| 600 PERROR (new_name); | |
| 601 } | |
| 602 | |
| 603 #define SYMNDX_TEXT 0 | |
| 604 #define SYMNDX_DATA 1 | |
| 605 #define SYMNDX_BSS 2 | |
| 606 | |
| 607 for (i = 0; i < ldhdr.l_nreloc; i++) | |
| 608 { | |
| 609 lseek (a_out, | |
| 610 orig_load_scnptr + LDHDRSZ + LDSYMSZ*ldhdr.l_nsyms + LDRELSZ*i, | |
| 611 SEEK_SET); | |
| 612 | |
| 613 if (read (a_out, &ldrel, LDRELSZ) != LDRELSZ) | |
| 614 { | |
| 615 PERROR (a_name); | |
| 616 } | |
| 617 | |
| 618 /* move the BSS loader symbols to the DATA segment */ | |
| 619 if (ldrel.l_symndx == SYMNDX_BSS) | |
| 620 { | |
| 621 ldrel.l_symndx = SYMNDX_DATA; | |
| 622 | |
| 3025 | 623 lseek (new_, |
| 428 | 624 load_scnptr + LDHDRSZ + LDSYMSZ*ldhdr.l_nsyms + LDRELSZ*i, |
| 625 SEEK_SET); | |
| 626 | |
| 3025 | 627 if (write (new_, &ldrel, LDRELSZ) != LDRELSZ) |
| 428 | 628 { |
| 629 PERROR (new_name); | |
| 630 } | |
| 631 } | |
| 632 | |
| 633 if (ldrel.l_rsecnm == f_ohdr.o_sndata) | |
| 634 { | |
| 635 int orig_int; | |
| 636 | |
| 637 lseek (a_out, | |
| 638 orig_data_scnptr + (ldrel.l_vaddr - f_ohdr.data_start), | |
| 639 SEEK_SET); | |
| 640 | |
| 641 if (read (a_out, (void *) &orig_int, sizeof (orig_int)) | |
| 642 != sizeof (orig_int)) | |
| 643 { | |
| 644 PERROR (a_name); | |
| 645 } | |
| 646 | |
| 647 p = (int *) (ldrel.l_vaddr + d_reloc); | |
| 648 | |
| 649 switch (ldrel.l_symndx) { | |
| 650 case SYMNDX_TEXT: | |
| 651 orig_int = * p - t_reloc; | |
| 652 break; | |
| 653 | |
| 654 case SYMNDX_DATA: | |
| 655 case SYMNDX_BSS: | |
| 656 orig_int = * p - d_reloc; | |
| 657 break; | |
| 658 } | |
| 659 | |
| 660 if (orig_int != * p) | |
| 661 { | |
| 3025 | 662 lseek (new_, |
| 428 | 663 data_scnptr + (ldrel.l_vaddr - f_ohdr.data_start), |
| 664 SEEK_SET); | |
| 3025 | 665 if (write (new_, (void *) &orig_int, sizeof (orig_int)) |
| 428 | 666 != sizeof (orig_int)) |
| 667 { | |
| 668 PERROR (new_name); | |
| 669 } | |
| 670 } | |
| 671 } | |
| 672 } | |
| 673 return 0; | |
| 674 } |