Mercurial > hg > xemacs-beta
annotate src/unexaix.c @ 5533:11da5b828d10
shell-command and shell-command-on-region API compliant with FSF 23.3.1
| author | Mats Lidell <mats.lidell@cag.se> |
|---|---|
| date | Sun, 31 Jul 2011 01:29:09 +0200 |
| parents | 308d34e9f07d |
| children | 574f0cded429 |
| 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 | |
|
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6 XEmacs is free software: you can redistribute it and/or modify it |
| 428 | 7 under the terms of the GNU General Public License as published by the |
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8 Free Software Foundation, either version 3 of the License, or (at your |
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9 option) any later version. |
| 428 | 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 | |
|
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17 along with XEmacs. If not, see <http://www.gnu.org/licenses/>. */ |
| 428 | 18 |
| 19 /* Synched up with: FSF 20.2. */ | |
| 20 | |
| 771 | 21 /* This file has been ... uhhhhh ... Mule-ized. Yeah. |
| 22 | |
| 23 (Everything here is external format. That's potentially dangerous, | |
| 24 but in practice it'll be OK.) --ben */ | |
| 25 | |
| 428 | 26 /* Originally based on the COFF unexec.c by Spencer W. Thomas. |
| 27 * | |
| 28 * Subsequently hacked on by | |
| 29 * Bill Mann <Bill_Man@praxisint.com> | |
| 30 * Andrew Vignaux <Andrew.Vignaux@comp.vuw.ac.nz> | |
| 31 * Mike Sperber <sperber@informatik.uni-tuebingen.de> | |
| 32 * | |
| 33 * Synopsis: | |
| 34 * unexec (new_name, a_name, data_start, bss_start, entry_address) | |
| 35 * char *new_name, *a_name; | |
| 36 * unsigned data_start, bss_start, entry_address; | |
| 37 * | |
| 38 * Takes a snapshot of the program and makes an a.out format file in the | |
| 39 * file named by the string argument new_name. | |
| 40 * If a_name is non-NULL, the symbol table will be taken from the given file. | |
| 41 * On some machines, an existing a_name file is required. | |
| 42 * | |
| 43 * data_start and entry_address are ignored. | |
| 44 * | |
| 45 * bss_start indicates how much of the data segment is to be saved in the | |
| 46 * a.out file and restored when the program is executed. It gives the lowest | |
| 47 * unsaved address, and is rounded up to a page boundary. The default when 0 | |
| 48 * is given assumes that the entire data segment is to be stored, including | |
| 49 * the previous data and bss as well as any additional storage allocated with | |
| 50 * sbrk(2). | |
| 51 * | |
| 52 */ | |
| 53 | |
| 54 #ifndef emacs | |
| 55 #define PERROR(arg) perror (arg); return -1 | |
| 56 #else | |
| 57 #include <config.h> | |
| 3025 | 58 #define PERROR(file) report_error (file, new_) |
| 428 | 59 #endif |
| 60 | |
| 61 #include <a.out.h> | |
| 62 /* Define getpagesize () if the system does not. | |
| 63 Note that this may depend on symbols defined in a.out.h | |
| 64 */ | |
| 65 #include "getpagesize.h" | |
| 66 | |
| 67 #include <sys/types.h> | |
| 68 #include <stdio.h> | |
| 69 #include <sys/stat.h> | |
| 70 #include <errno.h> | |
| 71 #include <unistd.h> | |
| 72 #include <fcntl.h> | |
| 73 | |
| 74 extern char *start_of_text (void); /* Start of text */ | |
| 75 extern char *start_of_data (void); /* Start of initialized data */ | |
| 76 | |
| 77 extern int _data; | |
| 78 extern int _text; | |
| 79 | |
| 80 #include <filehdr.h> | |
| 81 #include <aouthdr.h> | |
| 82 #include <scnhdr.h> | |
| 83 #include <syms.h> | |
| 84 | |
| 85 static struct filehdr f_hdr; /* File header */ | |
| 86 static struct aouthdr f_ohdr; /* Optional file header (a.out) */ | |
| 87 static long bias; /* Bias to add for growth */ | |
| 88 static long lnnoptr; /* Pointer to line-number info within file */ | |
| 89 | |
| 90 static long text_scnptr; | |
| 91 static long data_scnptr; | |
| 92 #define ALIGN(val, pwr) (((val) + ((1L<<(pwr))-1)) & ~((1L<<(pwr))-1)) | |
| 93 static long load_scnptr; | |
| 94 static long orig_load_scnptr; | |
| 95 static long orig_data_scnptr; | |
| 96 static int unrelocate_symbols (int, int, char *, char *); | |
| 97 | |
| 98 #ifndef MAX_SECTIONS | |
| 99 #define MAX_SECTIONS 10 | |
| 100 #endif | |
| 101 | |
| 102 static int adjust_lnnoptrs (int, int, char *); | |
| 103 | |
| 104 static int pagemask; | |
| 105 | |
| 106 /* Correct an int which is the bit pattern of a pointer to a byte | |
| 107 into an int which is the number of a byte. | |
| 108 This is a no-op on ordinary machines, but not on all. */ | |
| 109 | |
| 110 #ifndef ADDR_CORRECT /* Let m-*.h files override this definition */ | |
| 111 #define ADDR_CORRECT(x) ((char *)(x) - (char*)0) | |
| 112 #endif | |
| 113 | |
| 114 #ifdef emacs | |
| 115 #include "lisp.h" | |
| 116 | |
| 117 static void | |
| 118 report_error (char *file, int fd) | |
| 119 { | |
| 120 if (fd) | |
| 121 close (fd); | |
| 563 | 122 report_error_with_errno (Qio_error, "Cannot unexec", |
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123 build_cistring (file)); |
| 428 | 124 } |
| 125 #endif /* emacs */ | |
| 126 | |
| 3025 | 127 #define ERROR0(msg) report_error_1 (new_, msg, 0, 0); return -1 |
| 128 #define ERROR1(msg,x) report_error_1 (new_, msg, x, 0); return -1 | |
| 129 #define ERROR2(msg,x,y) report_error_1 (new_, msg, x, y); return -1 | |
| 428 | 130 |
| 131 static void | |
| 132 report_error_1 (int fd, char *msg, int a1, int a2) | |
| 133 { | |
| 134 close (fd); | |
| 135 #ifdef emacs | |
| 563 | 136 signal_ferror (Qio_error, msg, a1, a2); |
| 428 | 137 #else |
| 138 fprintf (stderr, msg, a1, a2); | |
| 139 fprintf (stderr, "\n"); | |
| 140 #endif | |
| 141 } | |
| 142 | |
| 143 static int make_hdr (int, int, unsigned, unsigned, unsigned, char *, char *); | |
| 144 static void mark_x (char *); | |
| 145 static int copy_text_and_data (int); | |
| 146 static int copy_sym (int, int, char *, char *); | |
| 147 static void write_segment (int, char *, char *); | |
| 148 | |
| 149 /* **************************************************************** | |
| 150 * unexec | |
| 151 * | |
| 152 * driving logic. | |
| 153 */ | |
| 154 int unexec (char *new_name, char *a_name, | |
| 155 uintptr_t data_start, | |
| 156 uintptr_t bss_start, | |
| 157 uintptr_t entry_address) | |
| 158 { | |
| 3025 | 159 int new_ = -1, a_out = -1; |
| 428 | 160 |
| 161 if (a_name && (a_out = open (a_name, O_RDONLY)) < 0) | |
| 162 { | |
| 163 PERROR (a_name); | |
| 164 } | |
| 3025 | 165 if ((new_ = creat (new_name, 0666)) < 0) |
| 428 | 166 { |
| 167 PERROR (new_name); | |
| 168 } | |
| 3025 | 169 if (make_hdr (new_, a_out, |
| 428 | 170 data_start, bss_start, |
| 171 entry_address, | |
| 172 a_name, new_name) < 0 | |
| 3025 | 173 || copy_text_and_data (new_) < 0 |
| 174 || copy_sym (new_, a_out, a_name, new_name) < 0 | |
| 175 || adjust_lnnoptrs (new_, a_out, new_name) < 0 | |
| 176 || unrelocate_symbols (new_, a_out, a_name, new_name) < 0) | |
| 428 | 177 { |
| 3025 | 178 close (new_); |
| 428 | 179 return -1; |
| 180 } | |
| 181 | |
| 3025 | 182 close (new_); |
| 428 | 183 if (a_out >= 0) |
| 184 close (a_out); | |
| 185 mark_x (new_name); | |
| 186 return 0; | |
| 187 } | |
| 188 | |
| 189 /* **************************************************************** | |
| 190 * make_hdr | |
| 191 * | |
| 192 * Make the header in the new a.out from the header in core. | |
| 193 * Modify the text and data sizes. | |
| 194 */ | |
| 195 static int | |
| 3025 | 196 make_hdr (int new_, int a_out, |
| 428 | 197 unsigned data_start, unsigned bss_start, |
| 2286 | 198 unsigned UNUSED (entry_address), |
| 428 | 199 char *a_name, char *new_name) |
| 200 { | |
| 201 int scns; | |
| 202 unsigned int bss_end; | |
| 203 | |
| 204 struct scnhdr section[MAX_SECTIONS]; | |
| 205 struct scnhdr * f_thdr; /* Text section header */ | |
| 206 struct scnhdr * f_dhdr; /* Data section header */ | |
| 207 struct scnhdr * f_bhdr; /* Bss section header */ | |
| 208 struct scnhdr * f_lhdr; /* Loader section header */ | |
| 209 struct scnhdr * f_tchdr; /* Typechk section header */ | |
| 210 struct scnhdr * f_dbhdr; /* Debug section header */ | |
| 211 struct scnhdr * f_xhdr; /* Except section header */ | |
| 212 | |
| 213 load_scnptr = orig_load_scnptr = lnnoptr = 0; | |
| 214 pagemask = getpagesize () - 1; | |
| 215 | |
| 216 /* Adjust text/data boundary. */ | |
| 217 data_start = (long) start_of_data (); | |
| 218 data_start = ADDR_CORRECT (data_start); | |
| 219 | |
| 220 data_start = data_start & ~pagemask; /* (Down) to page boundary. */ | |
| 221 | |
| 222 bss_end = ADDR_CORRECT (sbrk (0)) + pagemask; | |
| 223 bss_end &= ~ pagemask; | |
| 224 /* Adjust data/bss boundary. */ | |
| 225 if (bss_start != 0) | |
| 226 { | |
| 227 bss_start = (ADDR_CORRECT (bss_start) + pagemask); | |
| 228 /* (Up) to page bdry. */ | |
| 229 bss_start &= ~ pagemask; | |
| 230 if (bss_start > bss_end) | |
| 231 { | |
| 232 ERROR1 ("unexec: Specified bss_start (%u) is past end of program", | |
| 233 bss_start); | |
| 234 } | |
| 235 } | |
| 236 else | |
| 237 bss_start = bss_end; | |
| 238 | |
| 239 if (data_start > bss_start) /* Can't have negative data size. */ | |
| 240 { | |
| 241 ERROR2 ("unexec: data_start (%u) can't be greater than bss_start (%u)", | |
| 242 data_start, bss_start); | |
| 243 } | |
| 244 | |
| 245 /* Salvage as much info from the existing file as possible */ | |
| 246 f_thdr = NULL; f_dhdr = NULL; f_bhdr = NULL; | |
| 247 f_lhdr = NULL; f_tchdr = NULL; f_dbhdr = NULL; f_xhdr = NULL; | |
| 248 if (a_out >= 0) | |
| 249 { | |
| 250 if (read (a_out, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) | |
| 251 { | |
| 252 PERROR (a_name); | |
| 253 } | |
| 254 if (f_hdr.f_opthdr > 0) | |
| 255 { | |
| 256 if (read (a_out, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) | |
| 257 { | |
| 258 PERROR (a_name); | |
| 259 } | |
| 260 } | |
| 261 if (f_hdr.f_nscns > MAX_SECTIONS) | |
| 262 { | |
| 263 ERROR0 ("unexec: too many section headers -- increase MAX_SECTIONS"); | |
| 264 } | |
| 265 /* Loop through section headers */ | |
| 266 for (scns = 0; scns < f_hdr.f_nscns; scns++) { | |
| 267 struct scnhdr *s = §ion[scns]; | |
| 268 if (read (a_out, s, sizeof (*s)) != sizeof (*s)) | |
| 269 { | |
| 270 PERROR (a_name); | |
| 271 } | |
| 272 | |
| 273 #define CHECK_SCNHDR(ptr, name, flags) \ | |
| 274 if (strcmp(s->s_name, name) == 0) { \ | |
| 275 if (s->s_flags != flags) { \ | |
| 276 fprintf(stderr, "unexec: %lx flags where %x expected in %s section.\n", \ | |
| 277 (unsigned long)s->s_flags, flags, name); \ | |
| 278 } \ | |
| 279 if (ptr) { \ | |
| 280 fprintf(stderr, "unexec: duplicate section header for section %s.\n", \ | |
| 281 name); \ | |
| 282 } \ | |
| 283 ptr = s; \ | |
| 284 } | |
| 285 CHECK_SCNHDR(f_thdr, _TEXT, STYP_TEXT); | |
| 286 CHECK_SCNHDR(f_dhdr, _DATA, STYP_DATA); | |
| 287 CHECK_SCNHDR(f_bhdr, _BSS, STYP_BSS); | |
| 288 CHECK_SCNHDR(f_lhdr, _LOADER, STYP_LOADER); | |
| 289 CHECK_SCNHDR(f_dbhdr, _DEBUG, STYP_DEBUG); | |
| 290 CHECK_SCNHDR(f_tchdr, _TYPCHK, STYP_TYPCHK); | |
| 291 CHECK_SCNHDR(f_xhdr, _EXCEPT, STYP_EXCEPT); | |
| 292 } | |
| 293 | |
| 294 if (f_thdr == 0) | |
| 295 { | |
| 296 ERROR1 ("unexec: couldn't find \"%s\" section", (int) _TEXT); | |
| 297 } | |
| 298 if (f_dhdr == 0) | |
| 299 { | |
| 300 ERROR1 ("unexec: couldn't find \"%s\" section", (int) _DATA); | |
| 301 } | |
| 302 if (f_bhdr == 0) | |
| 303 { | |
| 304 ERROR1 ("unexec: couldn't find \"%s\" section", (int) _BSS); | |
| 305 } | |
| 306 } | |
| 307 else | |
| 308 { | |
| 309 ERROR0 ("can't build a COFF file from scratch yet"); | |
| 310 } | |
| 311 orig_data_scnptr = f_dhdr->s_scnptr; | |
| 312 orig_load_scnptr = f_lhdr ? f_lhdr->s_scnptr : 0; | |
| 313 | |
| 314 /* Now we alter the contents of all the f_*hdr variables | |
| 315 to correspond to what we want to dump. */ | |
| 316 | |
| 317 /* Indicate that the reloc information is no longer valid for ld (bind); | |
| 318 we only update it enough to fake out the exec-time loader. */ | |
| 319 f_hdr.f_flags |= (F_RELFLG | F_EXEC); | |
| 320 | |
| 321 f_ohdr.dsize = bss_start - f_ohdr.data_start; | |
| 322 f_ohdr.bsize = bss_end - bss_start; | |
| 323 | |
| 324 f_dhdr->s_size = f_ohdr.dsize; | |
| 325 f_bhdr->s_size = f_ohdr.bsize; | |
| 326 f_bhdr->s_paddr = f_ohdr.data_start + f_ohdr.dsize; | |
| 327 f_bhdr->s_vaddr = f_ohdr.data_start + f_ohdr.dsize; | |
| 328 | |
| 329 /* fix scnptr's */ | |
| 330 { | |
| 331 ulong ptr = section[0].s_scnptr; | |
| 332 | |
| 333 bias = -1; | |
| 334 for (scns = 0; scns < f_hdr.f_nscns; scns++) | |
| 335 { | |
| 336 struct scnhdr *s = §ion[scns]; | |
| 337 | |
| 338 if (s->s_flags & STYP_PAD) /* .pad sections omitted in AIX 4.1 */ | |
| 339 { | |
| 340 /* | |
| 341 * the text_start should probably be o_algntext but that doesn't | |
| 342 * seem to change | |
| 343 */ | |
| 344 if (f_ohdr.text_start != 0) /* && scns != 0 */ | |
| 345 { | |
| 346 s->s_size = 512 - (ptr % 512); | |
| 347 if (s->s_size == 512) | |
| 348 s->s_size = 0; | |
| 349 } | |
| 350 s->s_scnptr = ptr; | |
| 351 } | |
| 352 else if (s->s_flags & STYP_DATA) | |
| 353 s->s_scnptr = ptr; | |
| 354 else if (!(s->s_flags & (STYP_TEXT | STYP_BSS))) | |
| 355 { | |
| 356 if (bias == -1) /* if first section after bss */ | |
| 357 bias = ptr - s->s_scnptr; | |
| 358 | |
| 359 s->s_scnptr += bias; | |
| 360 ptr = s->s_scnptr; | |
| 361 } | |
| 362 | |
| 363 ptr = ptr + s->s_size; | |
| 364 } | |
| 365 } | |
| 366 | |
| 367 /* fix other pointers */ | |
| 368 for (scns = 0; scns < f_hdr.f_nscns; scns++) | |
| 369 { | |
| 370 struct scnhdr *s = §ion[scns]; | |
| 371 | |
| 372 if (s->s_relptr != 0) | |
| 373 { | |
| 374 s->s_relptr += bias; | |
| 375 } | |
| 376 if (s->s_lnnoptr != 0) | |
| 377 { | |
| 378 if (lnnoptr == 0) lnnoptr = s->s_lnnoptr; | |
| 379 s->s_lnnoptr += bias; | |
| 380 } | |
| 381 } | |
| 382 | |
| 383 if (f_hdr.f_symptr > 0L) | |
| 384 { | |
| 385 f_hdr.f_symptr += bias; | |
| 386 } | |
| 387 | |
| 388 text_scnptr = f_thdr->s_scnptr; | |
| 389 data_scnptr = f_dhdr->s_scnptr; | |
| 390 load_scnptr = f_lhdr ? f_lhdr->s_scnptr : 0; | |
| 391 | |
| 3025 | 392 if (write (new_, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) |
| 428 | 393 { |
| 394 PERROR (new_name); | |
| 395 } | |
| 396 | |
| 397 if (f_hdr.f_opthdr > 0) | |
| 398 { | |
| 3025 | 399 if (write (new_, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) |
| 428 | 400 { |
| 401 PERROR (new_name); | |
| 402 } | |
| 403 } | |
| 404 | |
| 405 for (scns = 0; scns < f_hdr.f_nscns; scns++) { | |
| 406 struct scnhdr *s = §ion[scns]; | |
| 3025 | 407 if (write (new_, s, sizeof (*s)) != sizeof (*s)) |
| 428 | 408 { |
| 409 PERROR (new_name); | |
| 410 } | |
| 411 } | |
| 412 | |
| 413 return (0); | |
| 414 } | |
| 415 | |
| 416 /* **************************************************************** | |
| 417 | |
| 418 * | |
| 419 * Copy the text and data segments from memory to the new a.out | |
| 420 */ | |
| 421 static int | |
| 3025 | 422 copy_text_and_data (int new_) |
| 428 | 423 { |
| 424 char *end; | |
| 425 char *ptr; | |
| 426 | |
| 3025 | 427 lseek (new_, (long) text_scnptr, SEEK_SET); |
| 428 | 428 ptr = start_of_text () + text_scnptr; |
| 429 end = ptr + f_ohdr.tsize; | |
| 3025 | 430 write_segment (new_, ptr, end); |
| 428 | 431 |
| 3025 | 432 lseek (new_, (long) data_scnptr, SEEK_SET); |
| 428 | 433 ptr = (char *) f_ohdr.data_start; |
| 434 end = ptr + f_ohdr.dsize; | |
| 3025 | 435 write_segment (new_, ptr, end); |
| 428 | 436 |
| 437 return 0; | |
| 438 } | |
| 439 | |
| 440 #define UnexBlockSz (1<<12) /* read/write block size */ | |
| 441 static void | |
| 3025 | 442 write_segment (int new_, char *ptr, char *end) |
| 428 | 443 { |
| 444 int i, nwrite, ret; | |
| 445 char buf[80]; | |
| 446 char zeros[UnexBlockSz]; | |
| 447 | |
| 448 for (i = 0; ptr < end;) | |
| 449 { | |
| 450 /* distance to next block. */ | |
| 451 nwrite = (((int) ptr + UnexBlockSz) & -UnexBlockSz) - (int) ptr; | |
| 452 /* But not beyond specified end. */ | |
| 453 if (nwrite > end - ptr) nwrite = end - ptr; | |
| 3025 | 454 ret = write (new_, ptr, nwrite); |
| 428 | 455 /* If write gets a page fault, it means we reached |
| 456 a gap between the old text segment and the old data segment. | |
| 457 This gap has probably been remapped into part of the text segment. | |
| 458 So write zeros for it. */ | |
| 459 if (ret == -1 && errno == EFAULT) | |
| 460 { | |
| 461 memset (zeros, 0, nwrite); | |
| 3025 | 462 write (new_, zeros, nwrite); |
| 428 | 463 } |
| 464 else if (nwrite != ret) | |
| 465 { | |
| 466 sprintf (buf, | |
| 467 "unexec write failure: addr 0x%lx, fileno %d, size 0x%x, wrote 0x%x, errno %d", | |
| 3025 | 468 (unsigned long)ptr, new_, nwrite, ret, errno); |
| 428 | 469 PERROR (buf); |
| 470 } | |
| 471 i += nwrite; | |
| 472 ptr += nwrite; | |
| 473 } | |
| 474 } | |
| 475 | |
| 476 /* **************************************************************** | |
| 477 * copy_sym | |
| 478 * | |
| 479 * Copy the relocation information and symbol table from the a.out to the new | |
| 480 */ | |
| 481 static int | |
| 3025 | 482 copy_sym (int new_, int a_out, char *a_name, char *new_name) |
| 428 | 483 { |
| 484 char page[UnexBlockSz]; | |
| 485 int n; | |
| 486 | |
| 487 if (a_out < 0) | |
| 488 return 0; | |
| 489 | |
| 490 if (orig_load_scnptr == 0L) | |
| 491 return 0; | |
| 492 | |
| 493 if (lnnoptr && lnnoptr < orig_load_scnptr) /* if there is line number info */ | |
| 494 lseek (a_out, lnnoptr, SEEK_SET); /* start copying from there */ | |
| 495 else | |
| 496 lseek (a_out, orig_load_scnptr, SEEK_SET); /* Position a.out to symtab. */ | |
| 497 | |
| 647 | 498 while ((n = read (a_out, page, sizeof (page))) > 0) |
| 428 | 499 { |
| 3025 | 500 if (write (new_, page, n) != n) |
| 428 | 501 { |
| 502 PERROR (new_name); | |
| 503 } | |
| 504 } | |
| 505 if (n < 0) | |
| 506 { | |
| 507 PERROR (a_name); | |
| 508 } | |
| 509 return 0; | |
| 510 } | |
| 511 | |
| 512 /* **************************************************************** | |
| 513 * mark_x | |
| 514 * | |
| 515 * After successfully building the new a.out, mark it executable | |
| 516 */ | |
| 517 static void | |
| 518 mark_x (char *name) | |
| 519 { | |
| 520 struct stat sbuf; | |
| 521 int um; | |
| 3025 | 522 int new_ = 0; /* for PERROR */ |
| 428 | 523 |
| 524 um = umask (777); | |
| 525 umask (um); | |
| 526 if (stat (name, &sbuf) == -1) | |
| 527 { | |
| 528 PERROR (name); | |
| 529 } | |
| 530 sbuf.st_mode |= 0111 & ~um; | |
| 531 if (chmod (name, sbuf.st_mode) == -1) | |
| 532 PERROR (name); | |
| 533 } | |
| 534 | |
| 535 static int | |
| 2286 | 536 adjust_lnnoptrs (int UNUSED (writedesc), int UNUSED (readdesc), char *new_name) |
| 428 | 537 { |
| 538 int nsyms; | |
| 539 int naux; | |
| 3025 | 540 int new_; |
| 428 | 541 struct syment symentry; |
| 542 union auxent auxentry; | |
| 543 | |
| 544 if (!lnnoptr || !f_hdr.f_symptr) | |
| 545 return 0; | |
| 546 | |
| 3025 | 547 if ((new_ = open (new_name, O_RDWR)) < 0) |
| 428 | 548 { |
| 549 PERROR (new_name); | |
| 550 return -1; | |
| 551 } | |
| 552 | |
| 3025 | 553 lseek (new_, f_hdr.f_symptr, SEEK_SET); |
| 428 | 554 for (nsyms = 0; nsyms < f_hdr.f_nsyms; nsyms++) |
| 555 { | |
| 3025 | 556 read (new_, &symentry, SYMESZ); |
| 428 | 557 if (symentry.n_sclass == C_BINCL || symentry.n_sclass == C_EINCL) |
| 558 { | |
| 559 symentry.n_value += bias; | |
| 3025 | 560 lseek (new_, -SYMESZ, SEEK_CUR); |
| 561 write (new_, &symentry, SYMESZ); | |
| 428 | 562 } |
| 563 | |
| 564 for (naux = symentry.n_numaux; naux-- != 0; ) | |
| 565 { | |
| 3025 | 566 read (new_, &auxentry, AUXESZ); |
| 428 | 567 nsyms++; |
| 568 if (naux != 0 /* skip csect auxentry (last entry) */ | |
| 569 && (symentry.n_sclass == C_EXT || symentry.n_sclass == C_HIDEXT)) | |
| 570 { | |
| 571 auxentry.x_sym.x_fcnary.x_fcn.x_lnnoptr += bias; | |
| 3025 | 572 lseek (new_, -AUXESZ, SEEK_CUR); |
| 573 write (new_, &auxentry, AUXESZ); | |
| 428 | 574 } |
| 575 } | |
| 576 } | |
| 3025 | 577 close (new_); |
| 428 | 578 |
| 579 return 0; | |
| 580 } | |
| 581 | |
| 582 static int | |
| 3025 | 583 unrelocate_symbols (int new_, int a_out, char *a_name, char *new_name) |
| 428 | 584 { |
| 585 int i; | |
| 586 LDHDR ldhdr; | |
| 587 LDREL ldrel; | |
| 588 ulong t_reloc = (ulong) &_text - f_ohdr.text_start; | |
| 589 ulong d_reloc = (ulong) &_data - f_ohdr.data_start; | |
| 590 int * p; | |
| 591 | |
| 592 if (load_scnptr == 0) | |
| 593 return 0; | |
| 594 | |
| 595 lseek (a_out, orig_load_scnptr, SEEK_SET); | |
| 596 if (read (a_out, &ldhdr, sizeof (ldhdr)) != sizeof (ldhdr)) | |
| 597 { | |
| 598 PERROR (new_name); | |
| 599 } | |
| 600 | |
| 601 #define SYMNDX_TEXT 0 | |
| 602 #define SYMNDX_DATA 1 | |
| 603 #define SYMNDX_BSS 2 | |
| 604 | |
| 605 for (i = 0; i < ldhdr.l_nreloc; i++) | |
| 606 { | |
| 607 lseek (a_out, | |
| 608 orig_load_scnptr + LDHDRSZ + LDSYMSZ*ldhdr.l_nsyms + LDRELSZ*i, | |
| 609 SEEK_SET); | |
| 610 | |
| 611 if (read (a_out, &ldrel, LDRELSZ) != LDRELSZ) | |
| 612 { | |
| 613 PERROR (a_name); | |
| 614 } | |
| 615 | |
| 616 /* move the BSS loader symbols to the DATA segment */ | |
| 617 if (ldrel.l_symndx == SYMNDX_BSS) | |
| 618 { | |
| 619 ldrel.l_symndx = SYMNDX_DATA; | |
| 620 | |
| 3025 | 621 lseek (new_, |
| 428 | 622 load_scnptr + LDHDRSZ + LDSYMSZ*ldhdr.l_nsyms + LDRELSZ*i, |
| 623 SEEK_SET); | |
| 624 | |
| 3025 | 625 if (write (new_, &ldrel, LDRELSZ) != LDRELSZ) |
| 428 | 626 { |
| 627 PERROR (new_name); | |
| 628 } | |
| 629 } | |
| 630 | |
| 631 if (ldrel.l_rsecnm == f_ohdr.o_sndata) | |
| 632 { | |
| 633 int orig_int; | |
| 634 | |
| 635 lseek (a_out, | |
| 636 orig_data_scnptr + (ldrel.l_vaddr - f_ohdr.data_start), | |
| 637 SEEK_SET); | |
| 638 | |
| 639 if (read (a_out, (void *) &orig_int, sizeof (orig_int)) | |
| 640 != sizeof (orig_int)) | |
| 641 { | |
| 642 PERROR (a_name); | |
| 643 } | |
| 644 | |
| 645 p = (int *) (ldrel.l_vaddr + d_reloc); | |
| 646 | |
| 647 switch (ldrel.l_symndx) { | |
| 648 case SYMNDX_TEXT: | |
| 649 orig_int = * p - t_reloc; | |
| 650 break; | |
| 651 | |
| 652 case SYMNDX_DATA: | |
| 653 case SYMNDX_BSS: | |
| 654 orig_int = * p - d_reloc; | |
| 655 break; | |
| 656 } | |
| 657 | |
| 658 if (orig_int != * p) | |
| 659 { | |
| 3025 | 660 lseek (new_, |
| 428 | 661 data_scnptr + (ldrel.l_vaddr - f_ohdr.data_start), |
| 662 SEEK_SET); | |
| 3025 | 663 if (write (new_, (void *) &orig_int, sizeof (orig_int)) |
| 428 | 664 != sizeof (orig_int)) |
| 665 { | |
| 666 PERROR (new_name); | |
| 667 } | |
| 668 } | |
| 669 } | |
| 670 } | |
| 671 return 0; | |
| 672 } |