Mercurial > hg > xemacs-beta
annotate src/unexec.c @ 5534:68db75473fc6
Merge.
| author | Mats Lidell <mats.lidell@cag.se> |
|---|---|
| date | Sun, 07 Aug 2011 23:22:59 +0200 |
| parents | 308d34e9f07d |
| children | 574f0cded429 |
| rev | line source |
|---|---|
| 428 | 1 /* Copyright (C) 1985, 1986, 1987, 1988, 1992, 1993, 1994 |
| 771 | 2 /* Copyright (C) 2001 Ben Wing. |
| 428 | 3 Free Software Foundation, Inc. |
| 4 | |
| 5 This file is part of XEmacs. | |
| 6 | |
|
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7 XEmacs is free software: you can redistribute it and/or modify it |
| 428 | 8 under the terms of the GNU General Public License as published by the |
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9 Free Software Foundation, either version 3 of the License, or (at your |
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10 option) any later version. |
| 428 | 11 |
| 12 XEmacs is distributed in the hope that it will be useful, but WITHOUT | |
| 13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 15 for more details. | |
| 16 | |
| 17 You should have received a copy of the GNU General Public License | |
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18 along with XEmacs. If not, see <http://www.gnu.org/licenses/>. */ |
| 428 | 19 |
| 20 /* Synched up with: FSF 19.31. */ | |
| 21 | |
| 22 /* | |
| 23 * unexec.c - Convert a running program into an a.out file. | |
| 24 * | |
| 25 * Author: Spencer W. Thomas | |
| 26 * Computer Science Dept. | |
| 27 * University of Utah | |
| 28 * Date: Tue Mar 2 1982 | |
| 29 * Modified heavily since then. | |
| 30 * | |
| 31 * Synopsis: | |
| 32 * unexec (new_name, a_name, data_start, bss_start, entry_address) | |
| 33 * char *new_name, *a_name; | |
| 34 * unsigned data_start, bss_start, entry_address; | |
| 35 * | |
| 36 * Takes a snapshot of the program and makes an a.out format file in the | |
| 37 * file named by the string argument new_name. | |
| 38 * If a_name is non-NULL, the symbol table will be taken from the given file. | |
| 39 * On some machines, an existing a_name file is required. | |
| 40 * | |
| 41 * The boundaries within the a.out file may be adjusted with the data_start | |
| 42 * and bss_start arguments. Either or both may be given as 0 for defaults. | |
| 43 * | |
| 44 * Data_start gives the boundary between the text segment and the data | |
| 45 * segment of the program. The text segment can contain shared, read-only | |
| 46 * program code and literal data, while the data segment is always unshared | |
| 47 * and unprotected. Data_start gives the lowest unprotected address. | |
| 48 * The value you specify may be rounded down to a suitable boundary | |
| 49 * as required by the machine you are using. | |
| 50 * | |
| 51 * Specifying zero for data_start means the boundary between text and data | |
| 52 * should not be the same as when the program was loaded. | |
| 53 * If NO_REMAP is defined, the argument data_start is ignored and the | |
| 54 * segment boundaries are never changed. | |
| 55 * | |
| 56 * Bss_start indicates how much of the data segment is to be saved in the | |
| 57 * a.out file and restored when the program is executed. It gives the lowest | |
| 58 * unsaved address, and is rounded up to a page boundary. The default when 0 | |
| 59 * is given assumes that the entire data segment is to be stored, including | |
| 60 * the previous data and bss as well as any additional storage allocated with | |
| 61 * break (2). | |
| 62 * | |
| 63 * The new file is set up to start at entry_address. | |
| 64 * | |
| 65 * If you make improvements I'd like to get them too. | |
| 66 * harpo!utah-cs!thomas, thomas@Utah-20 | |
| 67 * | |
| 68 */ | |
| 69 | |
| 70 /* Modified to support SysVr3 shared libraries by James Van Artsdalen | |
| 71 * of Dell Computer Corporation. james@bigtex.cactus.org. | |
| 72 */ | |
| 73 | |
| 74 /* There are several compilation parameters affecting unexec: | |
| 75 | |
| 76 * COFF | |
| 77 | |
| 78 Define this if your system uses COFF for executables. | |
| 79 | |
| 80 * NO_REMAP | |
| 81 | |
| 82 Define this if you do not want to try to save Emacs's pure data areas | |
| 83 as part of the text segment. | |
| 84 | |
| 85 Saving them as text is good because it allows users to share more. | |
| 86 | |
| 87 However, on machines that locate the text area far from the data area, | |
| 88 the boundary cannot feasibly be moved. Such machines require | |
| 89 NO_REMAP. | |
| 90 | |
| 91 Also, remapping can cause trouble with the built-in startup routine | |
| 92 /lib/crt0.o, which defines `environ' as an initialized variable. | |
| 93 Dumping `environ' as pure does not work! So, to use remapping, | |
| 94 you must write a startup routine for your machine in Emacs's crt0.c. | |
| 95 If NO_REMAP is defined, Emacs uses the system's crt0.o. | |
| 96 | |
| 97 * SEGMENT_MASK | |
| 98 | |
| 99 Some machines require that the beginnings and ends of segments | |
| 100 *in core* be on certain boundaries. For most machines, a page | |
| 101 boundary is sufficient. That is the default. When a larger | |
| 102 boundary is needed, define SEGMENT_MASK to a mask of | |
| 103 the bits that must be zero on such a boundary. | |
| 104 | |
| 105 * A_TEXT_OFFSET(HDR) | |
| 106 | |
| 107 Some machines count the a.out header as part of the size of the text | |
| 108 segment (a_text); they may actually load the header into core as the | |
| 109 first data in the text segment. Some have additional padding between | |
| 110 the header and the real text of the program that is counted in a_text. | |
| 111 | |
| 112 For these machines, define A_TEXT_OFFSET(HDR) to examine the header | |
| 113 structure HDR and return the number of bytes to add to `a_text' | |
| 114 before writing it (above and beyond the number of bytes of actual | |
| 115 program text). HDR's standard fields are already correct, except that | |
| 116 this adjustment to the `a_text' field has not yet been made; | |
| 117 thus, the amount of offset can depend on the data in the file. | |
| 438 | 118 |
| 428 | 119 * A_TEXT_SEEK(HDR) |
| 120 | |
| 121 If defined, this macro specifies the number of bytes to seek into the | |
| 122 a.out file before starting to write the text segment. | |
| 123 | |
| 124 * EXEC_MAGIC | |
| 125 | |
| 126 For machines using COFF, this macro, if defined, is a value stored | |
| 127 into the magic number field of the output file. | |
| 128 | |
| 129 * ADJUST_EXEC_HEADER | |
| 130 | |
| 131 This macro can be used to generate statements to adjust or | |
| 132 initialize nonstandard fields in the file header | |
| 133 | |
| 134 * ADDR_CORRECT(ADDR) | |
| 135 | |
| 136 Macro to correct an int which is the bit pattern of a pointer to a byte | |
| 137 into an int which is the number of a byte. | |
| 138 | |
| 139 This macro has a default definition which is usually right. | |
| 140 This default definition is a no-op on most machines (where a | |
| 141 pointer looks like an int) but not on all machines. | |
| 142 | |
| 143 */ | |
| 144 | |
| 145 #ifndef emacs | |
| 146 #define PERROR(arg) perror (arg); return -1 | |
| 147 #else | |
| 148 #define IN_UNEXEC | |
| 149 #include <config.h> | |
| 3025 | 150 #define PERROR(file) report_error (file, new_) |
| 428 | 151 #endif |
| 152 | |
| 153 #if __STDC__ || defined(STDC_HEADERS) | |
| 154 | |
| 155 /* I don't know how correct this attempt to get more prototypes is... */ | |
| 156 # if defined(sun) && defined(_POSIX_SOURCE) | |
| 157 # undef _POSIX_SOURCE | |
| 158 # endif | |
| 159 | |
| 160 # include <stddef.h> | |
| 161 # include <stdlib.h> | |
| 162 # include <unistd.h> | |
| 163 # include <string.h> | |
| 164 # include <stddef.h> | |
| 438 | 165 # include <errno.h> |
| 428 | 166 |
| 167 #endif | |
| 168 | |
| 169 /* I don't understand this, but it's necessary to get some slots in struct exec | |
| 170 from /usr/include/sys/exec.h when running LCC in strict ANSI mode. We don't | |
| 171 need this in K&R mode... | |
| 172 */ | |
| 173 #if defined(__lucid) && defined(__sparc) && !defined(sun) | |
| 174 # define sun 1 | |
| 175 #endif | |
| 176 | |
| 177 #include <a.out.h> | |
| 178 | |
| 179 /* Define getpagesize if the system does not. | |
| 180 Note that this may depend on symbols defined in a.out.h. */ | |
| 181 #include "getpagesize.h" | |
| 182 | |
| 183 #ifndef makedev /* Try to detect types.h already loaded */ | |
| 184 #include <sys/types.h> | |
| 185 #endif /* makedev */ | |
| 186 #include <stdio.h> | |
| 187 #include <sys/stat.h> | |
| 188 #include <errno.h> | |
| 189 | |
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190 #include <sys/file.h> /* Must be after sys/types.h for USG */ |
| 428 | 191 |
| 192 #ifdef USG5 | |
| 193 #include <fcntl.h> | |
| 194 #endif | |
| 195 | |
| 2286 | 196 #include "compiler.h" |
| 197 | |
| 428 | 198 #ifndef O_RDONLY |
| 199 #define O_RDONLY 0 | |
| 200 #endif | |
| 201 #ifndef O_RDWR | |
| 202 #define O_RDWR 2 | |
| 203 #endif | |
| 204 | |
| 205 extern char *start_of_text (); /* Start of text */ | |
| 206 | |
| 207 extern void *start_of_data (); /* Start of initialized data */ | |
| 208 | |
| 209 #ifdef COFF | |
| 210 static long block_copy_start; /* Old executable start point */ | |
| 211 static struct filehdr f_hdr; /* File header */ | |
| 212 static struct aouthdr f_ohdr; /* Optional file header (a.out) */ | |
| 213 long bias; /* Bias to add for growth */ | |
| 214 long lnnoptr; /* Pointer to line-number info within file */ | |
| 215 #define SYMS_START block_copy_start | |
| 216 | |
| 217 static long text_scnptr; | |
| 218 static long data_scnptr; | |
| 219 | |
| 220 #else /* not COFF */ | |
| 221 | |
| 222 #ifdef __STDC__ | |
| 223 #ifndef __sys_stdtypes_h | |
| 224 #if !defined(_PTRDIFF_T) && !defined(_BSD_PTRDIFF_T_) | |
| 225 typedef long ptrdiff_t; | |
| 226 #endif | |
| 227 #endif | |
| 228 #ifndef HPUX | |
| 229 /* not sure where this for NetBSD should really go | |
| 230 and it probably applies to other systems */ | |
| 231 #if !defined(__NetBSD__) && !defined(__bsdi__) && !defined(__OpenBSD__) | |
| 232 extern void *sbrk (ptrdiff_t); | |
| 233 #else | |
| 234 extern char *sbrk (); | |
| 235 #endif /* __NetBSD__ or __OpenBSD__ */ | |
| 236 #endif /* HPUX */ | |
| 237 #else | |
| 238 extern void *sbrk (); | |
| 239 #endif | |
| 240 | |
| 241 #define SYMS_START ((long) N_SYMOFF (ohdr)) | |
| 242 | |
| 243 #ifdef HPUX | |
| 244 #include <model.h> | |
| 245 #define MY_ID MYSYS | |
| 246 static MAGIC OLDMAGIC = {MY_ID, SHARE_MAGIC}; | |
| 247 static MAGIC NEWMAGIC = {MY_ID, DEMAND_MAGIC}; | |
| 248 #define N_TXTOFF(x) TEXT_OFFSET(x) | |
| 249 #define N_SYMOFF(x) LESYM_OFFSET(x) | |
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250 static struct exec hdr, ohdr; |
| 428 | 251 |
| 252 #else /* not HPUX */ | |
| 253 | |
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254 #if defined (USG) && !defined (LINUX) |
| 428 | 255 static struct bhdr hdr, ohdr; |
| 256 #define a_magic fmagic | |
| 257 #define a_text tsize | |
| 258 #define a_data dsize | |
| 259 #define a_bss bsize | |
| 260 #define a_syms ssize | |
| 261 #define a_trsize rtsize | |
| 262 #define a_drsize rdsize | |
| 263 #define a_entry entry | |
| 264 #define N_BADMAG(x) \ | |
| 265 (((x).fmagic)!=OMAGIC && ((x).fmagic)!=NMAGIC &&\ | |
| 266 ((x).fmagic)!=FMAGIC && ((x).fmagic)!=IMAGIC) | |
| 267 #define NEWMAGIC FMAGIC | |
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268 #else /* !USG or LINUX */ |
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269 static struct exec hdr, ohdr; |
| 428 | 270 #define NEWMAGIC ZMAGIC |
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271 #endif /* !USG or LINUX */ |
| 428 | 272 #endif /* not HPUX */ |
| 273 | |
| 274 static int unexec_text_start; | |
| 275 static int unexec_data_start; | |
| 276 | |
| 277 #endif /* not COFF */ | |
| 278 | |
| 279 static int pagemask; | |
| 280 | |
| 281 /* Correct an int which is the bit pattern of a pointer to a byte | |
| 282 into an int which is the number of a byte. | |
| 283 This is a no-op on ordinary machines, but not on all. */ | |
| 284 | |
| 285 #ifndef ADDR_CORRECT /* Let m-*.h files override this definition */ | |
| 286 #define ADDR_CORRECT(x) ((char *)(x) - (char*)0) | |
| 287 #endif | |
| 288 | |
| 289 #ifdef emacs | |
| 290 | |
| 291 #include "lisp.h" | |
| 292 | |
| 293 static void | |
| 440 | 294 report_error (const char *file, int fd) |
| 428 | 295 { |
| 296 if (fd) | |
| 297 close (fd); | |
| 563 | 298 report_error_with_errno (Qio_error, "Cannot unexec", |
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299 build_extstring (file, Qfile_name)); |
| 428 | 300 } |
| 301 #endif /* emacs */ | |
| 302 | |
| 3025 | 303 #define ERROR0(msg) report_error_1 (new_, msg, 0, 0); return -1 |
| 304 #define ERROR1(msg,x) report_error_1 (new_, msg, x, 0); return -1 | |
| 305 #define ERROR2(msg,x,y) report_error_1 (new_, msg, x, y); return -1 | |
| 428 | 306 |
| 307 static void | |
| 308 report_error_1 (fd, msg, a1, a2) | |
| 309 int fd; | |
| 442 | 310 const char *msg; |
| 428 | 311 int a1, a2; |
| 312 { | |
| 313 close (fd); | |
| 314 #ifdef emacs | |
| 563 | 315 signal_ferror (Qio_error, msg, a1, a2); |
| 428 | 316 #else |
| 317 fprintf (stderr, msg, a1, a2); | |
| 318 fprintf (stderr, "\n"); | |
| 319 #endif | |
| 320 } | |
| 321 | |
| 3025 | 322 static int make_hdr (int new_, int a_out, unsigned data_start, |
| 428 | 323 unsigned bss_start, unsigned entry_address, |
| 324 char *a_name, char *new_name); | |
| 3025 | 325 static int copy_text_and_data (int new_, int a_out); |
| 326 static int copy_sym (int new_, int a_out, char *a_name, char *new_name); | |
| 428 | 327 static void mark_x (char *name); |
| 328 | |
| 329 /* **************************************************************** | |
| 330 * unexec | |
| 331 * | |
| 332 * driving logic. | |
| 333 */ | |
| 334 int | |
| 335 unexec (new_name, a_name, data_start, bss_start, entry_address) | |
| 336 char *new_name, *a_name; | |
| 337 unsigned data_start, bss_start, entry_address; | |
| 338 { | |
| 3025 | 339 int new_, a_out = -1; |
| 428 | 340 |
| 341 if (a_name && (a_out = open (a_name, O_RDONLY)) < 0) | |
| 342 { | |
| 343 PERROR (a_name); | |
| 344 } | |
| 3025 | 345 if ((new_ = creat (new_name, 0666)) < 0) |
| 428 | 346 { |
| 347 PERROR (new_name); | |
| 348 } | |
| 349 | |
| 3025 | 350 if (make_hdr (new_, a_out, data_start, bss_start, entry_address, a_name, new_name) < 0 |
| 351 || copy_text_and_data (new_, a_out) < 0 | |
| 352 || copy_sym (new_, a_out, a_name, new_name) < 0 | |
| 428 | 353 #ifdef COFF |
| 3025 | 354 || adjust_lnnoptrs (new_, a_out, new_name) < 0 |
| 428 | 355 #endif |
| 356 ) | |
| 357 { | |
| 3025 | 358 close (new_); |
| 428 | 359 /* unlink (new_name); / * Failed, unlink new a.out */ |
| 438 | 360 return -1; |
| 428 | 361 } |
| 362 | |
| 3025 | 363 close (new_); |
| 428 | 364 if (a_out >= 0) |
| 365 close (a_out); | |
| 366 mark_x (new_name); | |
| 367 return 0; | |
| 368 } | |
| 369 | |
| 370 /* **************************************************************** | |
| 371 * make_hdr | |
| 372 * | |
| 373 * Make the header in the new a.out from the header in core. | |
| 374 * Modify the text and data sizes. | |
| 375 */ | |
| 376 static int | |
| 3025 | 377 make_hdr (int new_, int a_out, unsigned data_start, unsigned bss_start, |
| 428 | 378 unsigned entry_address, char *a_name, char *new_name) |
| 379 { | |
| 380 #ifdef COFF | |
| 381 auto struct scnhdr f_thdr; /* Text section header */ | |
| 382 auto struct scnhdr f_dhdr; /* Data section header */ | |
| 383 auto struct scnhdr f_bhdr; /* Bss section header */ | |
| 384 auto struct scnhdr scntemp; /* Temporary section header */ | |
| 385 int scns; | |
| 386 #endif /* COFF */ | |
| 387 #ifdef USG_SHARED_LIBRARIES | |
| 388 extern unsigned int bss_end; | |
| 389 #else | |
| 390 unsigned int bss_end; | |
| 391 #endif | |
| 392 | |
| 393 pagemask = getpagesize () - 1; | |
| 394 | |
| 395 /* Adjust text/data boundary. */ | |
| 396 #ifdef NO_REMAP | |
| 397 data_start = (int) start_of_data (); | |
| 398 #else /* not NO_REMAP */ | |
| 399 if (!data_start) | |
| 400 data_start = (int) start_of_data (); | |
| 401 #endif /* not NO_REMAP */ | |
| 402 data_start = ADDR_CORRECT (data_start); | |
| 403 | |
| 404 #ifdef SEGMENT_MASK | |
| 405 data_start = data_start & ~SEGMENT_MASK; /* (Down) to segment boundary. */ | |
| 406 #else | |
| 407 data_start = data_start & ~pagemask; /* (Down) to page boundary. */ | |
| 408 #endif | |
| 409 | |
| 410 bss_end = ADDR_CORRECT (sbrk (0)) + pagemask; | |
| 411 bss_end &= ~ pagemask; | |
| 412 | |
| 413 /* Adjust data/bss boundary. */ | |
| 414 if (bss_start != 0) | |
| 415 { | |
| 416 bss_start = (ADDR_CORRECT (bss_start) + pagemask); | |
| 417 /* (Up) to page bdry. */ | |
| 418 bss_start &= ~ pagemask; | |
| 419 if (bss_start > bss_end) | |
| 420 { | |
| 421 ERROR1 ("unexec: Specified bss_start (%u) is past end of program", | |
| 422 bss_start); | |
| 423 } | |
| 424 } | |
| 425 else | |
| 426 bss_start = bss_end; | |
| 427 | |
| 428 if (data_start > bss_start) /* Can't have negative data size. */ | |
| 429 { | |
| 430 ERROR2 ("unexec: data_start (%u) can't be greater than bss_start (%u)", | |
| 431 data_start, bss_start); | |
| 432 } | |
| 433 | |
| 434 #ifdef COFF | |
| 435 /* Salvage as much info from the existing file as possible */ | |
| 436 if (a_out >= 0) | |
| 437 { | |
| 438 if (read (a_out, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) | |
| 439 { | |
| 440 PERROR (a_name); | |
| 441 } | |
| 442 block_copy_start += sizeof (f_hdr); | |
| 443 if (f_hdr.f_opthdr > 0) | |
| 444 { | |
| 445 if (read (a_out, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) | |
| 446 { | |
| 447 PERROR (a_name); | |
| 448 } | |
| 449 block_copy_start += sizeof (f_ohdr); | |
| 450 } | |
| 451 /* Loop through section headers, copying them in */ | |
| 452 lseek (a_out, sizeof (f_hdr) + f_hdr.f_opthdr, 0); | |
| 453 for (scns = f_hdr.f_nscns; scns > 0; scns--) { | |
| 454 if (read (a_out, &scntemp, sizeof (scntemp)) != sizeof (scntemp)) | |
| 455 { | |
| 456 PERROR (a_name); | |
| 457 } | |
| 458 if (scntemp.s_scnptr > 0L) | |
| 459 { | |
| 460 if (block_copy_start < scntemp.s_scnptr + scntemp.s_size) | |
| 461 block_copy_start = scntemp.s_scnptr + scntemp.s_size; | |
| 462 } | |
| 463 if (strcmp (scntemp.s_name, ".text") == 0) | |
| 464 { | |
| 465 f_thdr = scntemp; | |
| 466 } | |
| 467 else if (strcmp (scntemp.s_name, ".data") == 0) | |
| 468 { | |
| 469 f_dhdr = scntemp; | |
| 470 } | |
| 471 else if (strcmp (scntemp.s_name, ".bss") == 0) | |
| 472 { | |
| 473 f_bhdr = scntemp; | |
| 474 } | |
| 475 } | |
| 476 } | |
| 477 else | |
| 478 { | |
| 479 ERROR0 ("can't build a COFF file from scratch yet"); | |
| 480 } | |
| 481 | |
| 482 /* Now we alter the contents of all the f_*hdr variables | |
| 483 to correspond to what we want to dump. */ | |
| 484 | |
| 485 #ifdef USG_SHARED_LIBRARIES | |
| 486 | |
| 487 /* The amount of data we're adding to the file is distance from the | |
| 488 * end of the original .data space to the current end of the .data | |
| 489 * space. | |
| 490 */ | |
| 491 | |
| 492 bias = bss_start - (f_ohdr.data_start + f_dhdr.s_size); | |
| 493 | |
| 494 #endif | |
| 495 | |
| 496 f_hdr.f_flags |= (F_RELFLG | F_EXEC); | |
| 497 #ifdef EXEC_MAGIC | |
| 498 f_ohdr.magic = EXEC_MAGIC; | |
| 499 #endif | |
| 500 #ifndef NO_REMAP | |
| 501 f_ohdr.text_start = (long) start_of_text (); | |
| 502 f_ohdr.tsize = data_start - f_ohdr.text_start; | |
| 503 f_ohdr.data_start = data_start; | |
| 504 #endif /* NO_REMAP */ | |
| 505 f_ohdr.dsize = bss_start - f_ohdr.data_start; | |
| 506 f_ohdr.bsize = bss_end - bss_start; | |
| 507 /* On some machines, the old values are right. | |
| 508 ??? Maybe on all machines with NO_REMAP. */ | |
| 509 f_thdr.s_size = f_ohdr.tsize; | |
| 510 f_thdr.s_scnptr = sizeof (f_hdr) + sizeof (f_ohdr); | |
| 511 f_thdr.s_scnptr += (f_hdr.f_nscns) * (sizeof (f_thdr)); | |
| 512 lnnoptr = f_thdr.s_lnnoptr; | |
| 513 text_scnptr = f_thdr.s_scnptr; | |
| 514 f_dhdr.s_paddr = f_ohdr.data_start; | |
| 515 f_dhdr.s_vaddr = f_ohdr.data_start; | |
| 516 f_dhdr.s_size = f_ohdr.dsize; | |
| 517 f_dhdr.s_scnptr = f_thdr.s_scnptr + f_thdr.s_size; | |
| 518 data_scnptr = f_dhdr.s_scnptr; | |
| 519 f_bhdr.s_paddr = f_ohdr.data_start + f_ohdr.dsize; | |
| 520 f_bhdr.s_vaddr = f_ohdr.data_start + f_ohdr.dsize; | |
| 521 f_bhdr.s_size = f_ohdr.bsize; | |
| 522 f_bhdr.s_scnptr = 0L; | |
| 523 #ifndef USG_SHARED_LIBRARIES | |
| 524 bias = f_dhdr.s_scnptr + f_dhdr.s_size - block_copy_start; | |
| 525 #endif | |
| 526 | |
| 527 if (f_hdr.f_symptr > 0L) | |
| 528 { | |
| 529 f_hdr.f_symptr += bias; | |
| 530 } | |
| 531 | |
| 532 if (f_thdr.s_lnnoptr > 0L) | |
| 533 { | |
| 534 f_thdr.s_lnnoptr += bias; | |
| 535 } | |
| 536 | |
| 537 #ifdef ADJUST_EXEC_HEADER | |
| 538 ADJUST_EXEC_HEADER; | |
| 539 #endif /* ADJUST_EXEC_HEADER */ | |
| 540 | |
| 3025 | 541 if (write (new_, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) |
| 428 | 542 { |
| 543 PERROR (new_name); | |
| 544 } | |
| 545 | |
| 3025 | 546 if (write (new_, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) |
| 428 | 547 { |
| 548 PERROR (new_name); | |
| 549 } | |
| 550 | |
| 551 #ifndef USG_SHARED_LIBRARIES | |
| 552 | |
| 3025 | 553 if (write (new_, &f_thdr, sizeof (f_thdr)) != sizeof (f_thdr)) |
| 428 | 554 { |
| 555 PERROR (new_name); | |
| 556 } | |
| 557 | |
| 3025 | 558 if (write (new_, &f_dhdr, sizeof (f_dhdr)) != sizeof (f_dhdr)) |
| 428 | 559 { |
| 560 PERROR (new_name); | |
| 561 } | |
| 562 | |
| 3025 | 563 if (write (new_, &f_bhdr, sizeof (f_bhdr)) != sizeof (f_bhdr)) |
| 428 | 564 { |
| 565 PERROR (new_name); | |
| 566 } | |
| 567 | |
| 568 #else /* USG_SHARED_LIBRARIES */ | |
| 569 | |
| 570 /* The purpose of this code is to write out the new file's section | |
| 571 * header table. | |
| 572 * | |
| 573 * Scan through the original file's sections. If the encountered | |
| 574 * section is one we know (.text, .data or .bss), write out the | |
| 575 * correct header. If it is a section we do not know (such as | |
| 576 * .lib), adjust the address of where the section data is in the | |
| 577 * file, and write out the header. | |
| 578 * | |
| 579 * If any section precedes .text or .data in the file, this code | |
| 580 * will not adjust the file pointer for that section correctly. | |
| 581 */ | |
| 582 | |
| 583 /* This used to use sizeof (f_ohdr) instead of .f_opthdr. | |
| 584 .f_opthdr is said to be right when there is no optional header. */ | |
| 585 lseek (a_out, sizeof (f_hdr) + f_hdr.f_opthdr, 0); | |
| 586 | |
| 587 for (scns = f_hdr.f_nscns; scns > 0; scns--) | |
| 588 { | |
| 589 if (read (a_out, &scntemp, sizeof (scntemp)) != sizeof (scntemp)) | |
| 590 PERROR (a_name); | |
| 591 | |
| 592 if (!strcmp (scntemp.s_name, f_thdr.s_name)) /* .text */ | |
| 593 { | |
| 3025 | 594 if (write (new_, &f_thdr, sizeof (f_thdr)) != sizeof (f_thdr)) |
| 428 | 595 PERROR (new_name); |
| 596 } | |
| 597 else if (!strcmp (scntemp.s_name, f_dhdr.s_name)) /* .data */ | |
| 598 { | |
| 3025 | 599 if (write (new_, &f_dhdr, sizeof (f_dhdr)) != sizeof (f_dhdr)) |
| 428 | 600 PERROR (new_name); |
| 601 } | |
| 602 else if (!strcmp (scntemp.s_name, f_bhdr.s_name)) /* .bss */ | |
| 603 { | |
| 3025 | 604 if (write (new_, &f_bhdr, sizeof (f_bhdr)) != sizeof (f_bhdr)) |
| 428 | 605 PERROR (new_name); |
| 606 } | |
| 607 else | |
| 608 { | |
| 609 if (scntemp.s_scnptr) | |
| 610 scntemp.s_scnptr += bias; | |
| 3025 | 611 if (write (new_, &scntemp, sizeof (scntemp)) != sizeof (scntemp)) |
| 428 | 612 PERROR (new_name); |
| 613 } | |
| 614 } | |
| 615 #endif /* USG_SHARED_LIBRARIES */ | |
| 616 | |
| 617 return (0); | |
| 618 | |
| 619 #else /* if not COFF */ | |
| 620 | |
| 621 /* Get symbol table info from header of a.out file if given one. */ | |
| 622 if (a_out >= 0) | |
| 623 { | |
| 647 | 624 if (read (a_out, (char *) &ohdr, sizeof (hdr)) != sizeof (hdr)) |
| 428 | 625 { |
| 626 PERROR (a_name); | |
| 627 } | |
| 628 | |
| 629 if (N_BADMAG (ohdr)) | |
| 630 { | |
| 631 ERROR1 ("invalid magic number in %s", a_name); | |
| 632 } | |
| 633 hdr = ohdr; | |
| 634 } | |
| 635 else | |
| 636 { | |
| 647 | 637 memset ((void *)&hdr, 0, sizeof (hdr)); |
| 428 | 638 } |
| 639 | |
| 640 unexec_text_start = (long) start_of_text (); | |
| 641 unexec_data_start = data_start; | |
| 642 | |
| 643 /* Machine-dependent fixup for header, or maybe for unexec_text_start */ | |
| 644 #ifdef ADJUST_EXEC_HEADER | |
| 645 ADJUST_EXEC_HEADER; | |
| 646 #endif /* ADJUST_EXEC_HEADER */ | |
| 647 | |
| 648 hdr.a_trsize = 0; | |
| 649 hdr.a_drsize = 0; | |
| 650 if (entry_address != 0) | |
| 651 hdr.a_entry = entry_address; | |
| 652 | |
| 653 hdr.a_bss = bss_end - bss_start; | |
| 654 hdr.a_data = bss_start - data_start; | |
| 655 #ifdef NO_REMAP | |
| 656 hdr.a_text = ohdr.a_text; | |
| 657 #else /* not NO_REMAP */ | |
| 658 hdr.a_text = data_start - unexec_text_start; | |
| 659 | |
| 660 #ifdef A_TEXT_OFFSET | |
| 661 hdr.a_text += A_TEXT_OFFSET (ohdr); | |
| 662 #endif | |
| 663 | |
| 664 #endif /* not NO_REMAP */ | |
| 665 | |
| 3025 | 666 if (write (new_, (char *) &hdr, sizeof (hdr)) != sizeof (hdr)) |
| 428 | 667 { |
| 668 PERROR (new_name); | |
| 669 } | |
| 670 | |
| 671 #if 0 /* This #ifndef caused a bug on Linux when using QMAGIC. */ | |
| 672 /* This adjustment was done above only #ifndef NO_REMAP, | |
| 673 so only undo it now #ifndef NO_REMAP. */ | |
| 674 /* #ifndef NO_REMAP */ | |
| 675 #endif | |
| 676 #ifdef A_TEXT_OFFSET | |
| 677 hdr.a_text -= A_TEXT_OFFSET (ohdr); | |
| 678 #endif | |
| 679 | |
| 680 return 0; | |
| 681 | |
| 682 #endif /* not COFF */ | |
| 683 } | |
| 684 | |
| 685 static void write_segment (int, char *, char *); | |
| 686 | |
| 687 /* **************************************************************** | |
| 688 * copy_text_and_data | |
| 689 * | |
| 690 * Copy the text and data segments from memory to the new a.out | |
| 691 */ | |
| 692 static int | |
| 3025 | 693 copy_text_and_data (int new_, |
| 2286 | 694 #if defined (COFF) && defined (USG_SHARED_LIBRARIES) |
| 695 int a_out | |
| 696 #else | |
| 697 int UNUSED (a_out) | |
| 698 #endif | |
| 699 ) | |
| 428 | 700 { |
| 701 char *end; | |
| 702 char *ptr; | |
| 703 | |
| 704 #ifdef COFF | |
| 705 | |
| 706 #ifdef USG_SHARED_LIBRARIES | |
| 707 | |
| 708 int scns; | |
| 709 struct scnhdr scntemp; /* Temporary section header */ | |
| 710 | |
| 711 /* The purpose of this code is to write out the new file's section | |
| 712 * contents. | |
| 713 * | |
| 714 * Step through the section table. If we know the section (.text, | |
| 715 * .data) do the appropriate thing. Otherwise, if the section has | |
| 716 * no allocated space in the file (.bss), do nothing. Otherwise, | |
| 717 * the section has space allocated in the file, and is not a section | |
| 718 * we know. So just copy it. | |
| 719 */ | |
| 720 | |
| 721 lseek (a_out, sizeof (struct filehdr) + sizeof (struct aouthdr), 0); | |
| 722 | |
| 723 for (scns = f_hdr.f_nscns; scns > 0; scns--) | |
| 724 { | |
| 725 if (read (a_out, &scntemp, sizeof (scntemp)) != sizeof (scntemp)) | |
| 726 PERROR ("temacs"); | |
| 727 | |
| 728 if (!strcmp (scntemp.s_name, ".text")) | |
| 729 { | |
| 3025 | 730 lseek (new_, (long) text_scnptr, 0); |
| 428 | 731 ptr = (char *) f_ohdr.text_start; |
| 732 end = ptr + f_ohdr.tsize; | |
| 3025 | 733 write_segment (new_, ptr, end); |
| 428 | 734 } |
| 735 else if (!strcmp (scntemp.s_name, ".data")) | |
| 736 { | |
| 3025 | 737 lseek (new_, (long) data_scnptr, 0); |
| 428 | 738 ptr = (char *) f_ohdr.data_start; |
| 739 end = ptr + f_ohdr.dsize; | |
| 3025 | 740 write_segment (new_, ptr, end); |
| 428 | 741 } |
| 742 else if (!scntemp.s_scnptr) | |
| 743 ; /* do nothing - no data for this section */ | |
| 744 else | |
| 745 { | |
| 746 char page[BUFSIZ]; | |
| 747 int size, n; | |
| 748 long old_a_out_ptr = lseek (a_out, 0, 1); | |
| 749 | |
| 750 lseek (a_out, scntemp.s_scnptr, 0); | |
| 751 for (size = scntemp.s_size; size > 0; size -= sizeof (page)) | |
| 752 { | |
| 753 n = size > sizeof (page) ? sizeof (page) : size; | |
| 3025 | 754 if (read (a_out, page, n) != n || write (new_, page, n) != n) |
| 428 | 755 PERROR ("emacs"); |
| 756 } | |
| 757 lseek (a_out, old_a_out_ptr, 0); | |
| 758 } | |
| 759 } | |
| 760 | |
| 761 #else /* COFF, but not USG_SHARED_LIBRARIES */ | |
| 762 | |
| 3025 | 763 lseek (new_, (long) text_scnptr, 0); |
| 428 | 764 ptr = (char *) f_ohdr.text_start; |
| 765 end = ptr + f_ohdr.tsize; | |
| 3025 | 766 write_segment (new_, ptr, end); |
| 428 | 767 |
| 3025 | 768 lseek (new_, (long) data_scnptr, 0); |
| 428 | 769 ptr = (char *) f_ohdr.data_start; |
| 770 end = ptr + f_ohdr.dsize; | |
| 3025 | 771 write_segment (new_, ptr, end); |
| 428 | 772 |
| 773 #endif /* USG_SHARED_LIBRARIES */ | |
| 774 | |
| 775 #else /* if not COFF */ | |
| 776 | |
| 777 /* Some machines count the header as part of the text segment. | |
| 778 That is to say, the header appears in core | |
| 779 just before the address that start_of_text returns. | |
| 780 For them, N_TXTOFF is the place where the header goes. | |
| 781 We must adjust the seek to the place after the header. | |
| 782 Note that at this point hdr.a_text does *not* count | |
| 783 the extra A_TEXT_OFFSET bytes, only the actual bytes of code. */ | |
| 784 | |
| 785 #ifdef A_TEXT_SEEK | |
| 3025 | 786 lseek (new_, (long) A_TEXT_SEEK (hdr), 0); |
| 428 | 787 #else |
| 3025 | 788 lseek (new_, (long) N_TXTOFF (hdr), 0); |
| 428 | 789 #endif /* no A_TEXT_SEEK */ |
| 790 | |
| 791 ptr = (char *) unexec_text_start; | |
| 792 end = ptr + hdr.a_text; | |
| 3025 | 793 write_segment (new_, ptr, end); |
| 428 | 794 |
| 795 ptr = (char *) unexec_data_start; | |
| 796 end = ptr + hdr.a_data; | |
| 797 /* This lseek is certainly incorrect when A_TEXT_OFFSET | |
| 798 and I believe it is a no-op otherwise. | |
| 799 Let's see if its absence ever fails. */ | |
| 3025 | 800 /* lseek (new_, (long) N_TXTOFF (hdr) + hdr.a_text, 0); */ |
| 801 write_segment (new_, ptr, end); | |
| 428 | 802 |
| 803 #endif /* not COFF */ | |
| 804 | |
| 805 return 0; | |
| 806 } | |
| 807 | |
| 808 static void | |
| 3025 | 809 write_segment (new_, ptr, end) |
| 810 int new_; | |
| 428 | 811 char *ptr, *end; |
| 812 { | |
| 813 int i, nwrite, ret; | |
| 814 #if 0 | |
| 815 char buf[80]; | |
| 816 #endif | |
| 817 /* This is the normal amount to write at once. | |
| 818 It is the size of block that NFS uses. */ | |
| 819 int writesize = 1 << 13; | |
| 820 int pagesize = getpagesize (); | |
| 821 char zeros[1 << 13]; | |
| 822 | |
| 823 memset (zeros, 0, sizeof (zeros)); | |
| 824 | |
| 825 for (i = 0; ptr < end;) | |
| 826 { | |
| 827 /* Distance to next multiple of writesize. */ | |
| 828 nwrite = (((int) ptr + writesize) & -writesize) - (int) ptr; | |
| 829 /* But not beyond specified end. */ | |
| 830 if (nwrite > end - ptr) nwrite = end - ptr; | |
| 3025 | 831 ret = write (new_, ptr, nwrite); |
| 428 | 832 /* If write gets a page fault, it means we reached |
| 833 a gap between the old text segment and the old data segment. | |
| 834 This gap has probably been remapped into part of the text segment. | |
| 835 So write zeros for it. */ | |
| 836 if (ret == -1 | |
| 837 #ifdef EFAULT | |
| 838 && errno == EFAULT | |
| 839 #endif | |
| 840 ) | |
| 841 { | |
| 842 /* Write only a page of zeros at once, | |
| 843 so that we don't overshoot the start | |
| 844 of the valid memory in the old data segment. */ | |
| 845 if (nwrite > pagesize) | |
| 846 nwrite = pagesize; | |
| 3025 | 847 write (new_, zeros, nwrite); |
| 428 | 848 } |
| 849 #if 0 /* Now that we have can ask `write' to write more than a page, | |
| 850 it is legit for write do less than the whole amount specified. */ | |
| 851 else if (nwrite != ret) | |
| 852 { | |
| 853 sprintf (buf, | |
| 854 "unexec write failure: addr 0x%lx, fileno %d, size 0x%x, wrote 0x%x, errno %d", | |
| 3025 | 855 (unsigned long) ptr, new_, nwrite, ret, errno); |
| 428 | 856 PERROR (buf); |
| 857 } | |
| 858 #endif | |
| 859 i += nwrite; | |
| 860 ptr += nwrite; | |
| 861 } | |
| 862 } | |
| 863 | |
| 864 /* **************************************************************** | |
| 865 * copy_sym | |
| 866 * | |
| 867 * Copy the relocation information and symbol table from the a.out to the new | |
| 868 */ | |
| 869 static int | |
| 3025 | 870 copy_sym (int new_, int a_out, char *a_name, char *new_name) |
| 428 | 871 { |
| 872 char page[1024]; | |
| 873 int n; | |
| 874 | |
| 875 if (a_out < 0) | |
| 876 return 0; | |
| 877 | |
| 878 #ifdef COFF | |
| 879 if (SYMS_START == 0L) | |
| 880 return 0; | |
| 881 #endif /* COFF */ | |
| 882 | |
| 883 #ifdef COFF | |
| 884 if (lnnoptr) /* if there is line number info */ | |
| 885 lseek (a_out, lnnoptr, 0); /* start copying from there */ | |
| 886 else | |
| 887 #endif /* COFF */ | |
| 888 lseek (a_out, SYMS_START, 0); /* Position a.out to symtab. */ | |
| 889 | |
| 647 | 890 while ((n = read (a_out, page, sizeof (page))) > 0) |
| 428 | 891 { |
| 3025 | 892 if (write (new_, page, n) != n) |
| 428 | 893 { |
| 894 PERROR (new_name); | |
| 895 } | |
| 896 } | |
| 897 if (n < 0) | |
| 898 { | |
| 899 PERROR (a_name); | |
| 900 } | |
| 901 return 0; | |
| 902 } | |
| 903 | |
| 904 /* **************************************************************** | |
| 905 * mark_x | |
| 906 * | |
| 907 * After successfully building the new a.out, mark it executable | |
| 908 */ | |
| 909 static void | |
| 910 mark_x (char *name) | |
| 911 { | |
| 912 struct stat sbuf; | |
| 913 int um; | |
| 3025 | 914 int new_ = 0; /* for PERROR */ |
| 428 | 915 |
| 916 um = umask (777); | |
| 917 umask (um); | |
| 918 if (stat (name, &sbuf) == -1) | |
| 919 { | |
| 920 PERROR (name); | |
| 921 } | |
| 922 sbuf.st_mode |= 0111 & ~um; | |
| 923 if (chmod (name, sbuf.st_mode) == -1) | |
| 924 PERROR (name); | |
| 925 } | |
| 926 | |
| 927 #ifdef COFF | |
| 928 /* | |
| 929 * If the COFF file contains a symbol table and a line number section, | |
| 930 * then any auxiliary entries that have values for x_lnnoptr must | |
| 931 * be adjusted by the amount that the line number section has moved | |
| 932 * in the file (bias computed in make_hdr). The #@$%&* designers of | |
| 933 * the auxiliary entry structures used the absolute file offsets for | |
| 934 * the line number entry rather than an offset from the start of the | |
| 935 * line number section! | |
| 936 * | |
| 937 * When I figure out how to scan through the symbol table and pick out | |
| 938 * the auxiliary entries that need adjustment, this routine will | |
| 939 * be fixed. As it is now, all such entries are wrong and sdb | |
| 940 * will complain. Fred Fish, UniSoft Systems Inc. | |
| 941 */ | |
| 942 | |
| 943 /* This function is probably very slow. Instead of reopening the new | |
| 944 file for input and output it should copy from the old to the new | |
| 945 using the two descriptors already open (WRITEDESC and READDESC). | |
| 946 Instead of reading one small structure at a time it should use | |
| 947 a reasonable size buffer. But I don't have time to work on such | |
| 948 things, so I am installing it as submitted to me. -- RMS. */ | |
| 949 | |
| 950 int | |
| 951 adjust_lnnoptrs (writedesc, readdesc, new_name) | |
| 2286 | 952 int UNUSED (writedesc); |
| 953 int UNUSED (readdesc); | |
| 428 | 954 char *new_name; |
| 955 { | |
| 956 int nsyms; | |
| 3025 | 957 int new_; |
|
4759
aa5ed11f473b
Remove support for obsolete systems. See xemacs-patches message with ID
Jerry James <james@xemacs.org>
parents:
3025
diff
changeset
|
958 #if defined defined (pfa) |
| 428 | 959 SYMENT symentry; |
| 960 AUXENT auxentry; | |
| 961 #else | |
| 962 struct syment symentry; | |
| 963 union auxent auxentry; | |
| 964 #endif | |
| 965 | |
| 966 if (!lnnoptr || !f_hdr.f_symptr) | |
| 967 return 0; | |
| 968 | |
| 3025 | 969 if ((new_ = open (new_name, O_RDWR)) < 0) |
| 428 | 970 { |
| 971 PERROR (new_name); | |
| 972 return -1; | |
| 973 } | |
| 974 | |
| 3025 | 975 lseek (new_, f_hdr.f_symptr, 0); |
| 428 | 976 for (nsyms = 0; nsyms < f_hdr.f_nsyms; nsyms++) |
| 977 { | |
| 3025 | 978 read (new_, &symentry, SYMESZ); |
| 428 | 979 if (symentry.n_numaux) |
| 980 { | |
| 3025 | 981 read (new_, &auxentry, AUXESZ); |
| 428 | 982 nsyms++; |
| 983 if (ISFCN (symentry.n_type) || symentry.n_type == 0x2400) | |
| 984 { | |
| 985 auxentry.x_sym.x_fcnary.x_fcn.x_lnnoptr += bias; | |
| 3025 | 986 lseek (new_, -AUXESZ, 1); |
| 987 write (new_, &auxentry, AUXESZ); | |
| 428 | 988 } |
| 989 } | |
| 990 } | |
| 3025 | 991 close (new_); |
| 428 | 992 return 0; |
| 993 } | |
| 994 | |
| 995 #endif /* COFF */ |