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annotate src/unexec.c @ 5008:cad59a0a3b19
Add license information from Marcus Thiessel.
See xemacs-beta message <20100208091453.25900@gmx.net>.
| author | Jerry James <james@xemacs.org> |
|---|---|
| date | Tue, 09 Feb 2010 09:50:49 -0700 |
| parents | 304aebb79cd3 |
| children | 308d34e9f07d |
| 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 | |
| 7 XEmacs is free software; you can redistribute it and/or modify it | |
| 8 under the terms of the GNU General Public License as published by the | |
| 9 Free Software Foundation; either version 2, or (at your option) any | |
| 10 later version. | |
| 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 | |
| 18 along with XEmacs; see the file COPYING. If not, write to | |
| 19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
| 20 Boston, MA 02111-1307, USA. */ | |
| 21 | |
| 22 /* Synched up with: FSF 19.31. */ | |
| 23 | |
| 24 /* | |
| 25 * unexec.c - Convert a running program into an a.out file. | |
| 26 * | |
| 27 * Author: Spencer W. Thomas | |
| 28 * Computer Science Dept. | |
| 29 * University of Utah | |
| 30 * Date: Tue Mar 2 1982 | |
| 31 * Modified heavily since then. | |
| 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 * The boundaries within the a.out file may be adjusted with the data_start | |
| 44 * and bss_start arguments. Either or both may be given as 0 for defaults. | |
| 45 * | |
| 46 * Data_start gives the boundary between the text segment and the data | |
| 47 * segment of the program. The text segment can contain shared, read-only | |
| 48 * program code and literal data, while the data segment is always unshared | |
| 49 * and unprotected. Data_start gives the lowest unprotected address. | |
| 50 * The value you specify may be rounded down to a suitable boundary | |
| 51 * as required by the machine you are using. | |
| 52 * | |
| 53 * Specifying zero for data_start means the boundary between text and data | |
| 54 * should not be the same as when the program was loaded. | |
| 55 * If NO_REMAP is defined, the argument data_start is ignored and the | |
| 56 * segment boundaries are never changed. | |
| 57 * | |
| 58 * Bss_start indicates how much of the data segment is to be saved in the | |
| 59 * a.out file and restored when the program is executed. It gives the lowest | |
| 60 * unsaved address, and is rounded up to a page boundary. The default when 0 | |
| 61 * is given assumes that the entire data segment is to be stored, including | |
| 62 * the previous data and bss as well as any additional storage allocated with | |
| 63 * break (2). | |
| 64 * | |
| 65 * The new file is set up to start at entry_address. | |
| 66 * | |
| 67 * If you make improvements I'd like to get them too. | |
| 68 * harpo!utah-cs!thomas, thomas@Utah-20 | |
| 69 * | |
| 70 */ | |
| 71 | |
| 72 /* Modified to support SysVr3 shared libraries by James Van Artsdalen | |
| 73 * of Dell Computer Corporation. james@bigtex.cactus.org. | |
| 74 */ | |
| 75 | |
| 76 /* There are several compilation parameters affecting unexec: | |
| 77 | |
| 78 * COFF | |
| 79 | |
| 80 Define this if your system uses COFF for executables. | |
| 81 | |
| 82 * NO_REMAP | |
| 83 | |
| 84 Define this if you do not want to try to save Emacs's pure data areas | |
| 85 as part of the text segment. | |
| 86 | |
| 87 Saving them as text is good because it allows users to share more. | |
| 88 | |
| 89 However, on machines that locate the text area far from the data area, | |
| 90 the boundary cannot feasibly be moved. Such machines require | |
| 91 NO_REMAP. | |
| 92 | |
| 93 Also, remapping can cause trouble with the built-in startup routine | |
| 94 /lib/crt0.o, which defines `environ' as an initialized variable. | |
| 95 Dumping `environ' as pure does not work! So, to use remapping, | |
| 96 you must write a startup routine for your machine in Emacs's crt0.c. | |
| 97 If NO_REMAP is defined, Emacs uses the system's crt0.o. | |
| 98 | |
| 99 * SEGMENT_MASK | |
| 100 | |
| 101 Some machines require that the beginnings and ends of segments | |
| 102 *in core* be on certain boundaries. For most machines, a page | |
| 103 boundary is sufficient. That is the default. When a larger | |
| 104 boundary is needed, define SEGMENT_MASK to a mask of | |
| 105 the bits that must be zero on such a boundary. | |
| 106 | |
| 107 * A_TEXT_OFFSET(HDR) | |
| 108 | |
| 109 Some machines count the a.out header as part of the size of the text | |
| 110 segment (a_text); they may actually load the header into core as the | |
| 111 first data in the text segment. Some have additional padding between | |
| 112 the header and the real text of the program that is counted in a_text. | |
| 113 | |
| 114 For these machines, define A_TEXT_OFFSET(HDR) to examine the header | |
| 115 structure HDR and return the number of bytes to add to `a_text' | |
| 116 before writing it (above and beyond the number of bytes of actual | |
| 117 program text). HDR's standard fields are already correct, except that | |
| 118 this adjustment to the `a_text' field has not yet been made; | |
| 119 thus, the amount of offset can depend on the data in the file. | |
| 438 | 120 |
| 428 | 121 * A_TEXT_SEEK(HDR) |
| 122 | |
| 123 If defined, this macro specifies the number of bytes to seek into the | |
| 124 a.out file before starting to write the text segment. | |
| 125 | |
| 126 * EXEC_MAGIC | |
| 127 | |
| 128 For machines using COFF, this macro, if defined, is a value stored | |
| 129 into the magic number field of the output file. | |
| 130 | |
| 131 * ADJUST_EXEC_HEADER | |
| 132 | |
| 133 This macro can be used to generate statements to adjust or | |
| 134 initialize nonstandard fields in the file header | |
| 135 | |
| 136 * ADDR_CORRECT(ADDR) | |
| 137 | |
| 138 Macro to correct an int which is the bit pattern of a pointer to a byte | |
| 139 into an int which is the number of a byte. | |
| 140 | |
| 141 This macro has a default definition which is usually right. | |
| 142 This default definition is a no-op on most machines (where a | |
| 143 pointer looks like an int) but not on all machines. | |
| 144 | |
| 145 */ | |
| 146 | |
| 147 #ifndef emacs | |
| 148 #define PERROR(arg) perror (arg); return -1 | |
| 149 #else | |
| 150 #define IN_UNEXEC | |
| 151 #include <config.h> | |
| 3025 | 152 #define PERROR(file) report_error (file, new_) |
| 428 | 153 #endif |
| 154 | |
| 155 #if __STDC__ || defined(STDC_HEADERS) | |
| 156 | |
| 157 /* I don't know how correct this attempt to get more prototypes is... */ | |
| 158 # if defined(sun) && defined(_POSIX_SOURCE) | |
| 159 # undef _POSIX_SOURCE | |
| 160 # endif | |
| 161 | |
| 162 # include <stddef.h> | |
| 163 # include <stdlib.h> | |
| 164 # include <unistd.h> | |
| 165 # include <string.h> | |
| 166 # include <stddef.h> | |
| 438 | 167 # include <errno.h> |
| 428 | 168 |
| 169 #endif | |
| 170 | |
| 171 /* I don't understand this, but it's necessary to get some slots in struct exec | |
| 172 from /usr/include/sys/exec.h when running LCC in strict ANSI mode. We don't | |
| 173 need this in K&R mode... | |
| 174 */ | |
| 175 #if defined(__lucid) && defined(__sparc) && !defined(sun) | |
| 176 # define sun 1 | |
| 177 #endif | |
| 178 | |
| 179 #include <a.out.h> | |
| 180 | |
| 181 /* Define getpagesize if the system does not. | |
| 182 Note that this may depend on symbols defined in a.out.h. */ | |
| 183 #include "getpagesize.h" | |
| 184 | |
| 185 #ifndef makedev /* Try to detect types.h already loaded */ | |
| 186 #include <sys/types.h> | |
| 187 #endif /* makedev */ | |
| 188 #include <stdio.h> | |
| 189 #include <sys/stat.h> | |
| 190 #include <errno.h> | |
| 191 | |
|
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parents:
3025
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changeset
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192 #include <sys/file.h> /* Must be after sys/types.h for USG */ |
| 428 | 193 |
| 194 #ifdef USG5 | |
| 195 #include <fcntl.h> | |
| 196 #endif | |
| 197 | |
| 2286 | 198 #include "compiler.h" |
| 199 | |
| 428 | 200 #ifndef O_RDONLY |
| 201 #define O_RDONLY 0 | |
| 202 #endif | |
| 203 #ifndef O_RDWR | |
| 204 #define O_RDWR 2 | |
| 205 #endif | |
| 206 | |
| 207 extern char *start_of_text (); /* Start of text */ | |
| 208 | |
| 209 extern void *start_of_data (); /* Start of initialized data */ | |
| 210 | |
| 211 #ifdef COFF | |
| 212 static long block_copy_start; /* Old executable start point */ | |
| 213 static struct filehdr f_hdr; /* File header */ | |
| 214 static struct aouthdr f_ohdr; /* Optional file header (a.out) */ | |
| 215 long bias; /* Bias to add for growth */ | |
| 216 long lnnoptr; /* Pointer to line-number info within file */ | |
| 217 #define SYMS_START block_copy_start | |
| 218 | |
| 219 static long text_scnptr; | |
| 220 static long data_scnptr; | |
| 221 | |
| 222 #else /* not COFF */ | |
| 223 | |
| 224 #ifdef __STDC__ | |
| 225 #ifndef __sys_stdtypes_h | |
| 226 #if !defined(_PTRDIFF_T) && !defined(_BSD_PTRDIFF_T_) | |
| 227 typedef long ptrdiff_t; | |
| 228 #endif | |
| 229 #endif | |
| 230 #ifndef HPUX | |
| 231 /* not sure where this for NetBSD should really go | |
| 232 and it probably applies to other systems */ | |
| 233 #if !defined(__NetBSD__) && !defined(__bsdi__) && !defined(__OpenBSD__) | |
| 234 extern void *sbrk (ptrdiff_t); | |
| 235 #else | |
| 236 extern char *sbrk (); | |
| 237 #endif /* __NetBSD__ or __OpenBSD__ */ | |
| 238 #endif /* HPUX */ | |
| 239 #else | |
| 240 extern void *sbrk (); | |
| 241 #endif | |
| 242 | |
| 243 #define SYMS_START ((long) N_SYMOFF (ohdr)) | |
| 244 | |
| 245 #ifdef HPUX | |
| 246 #include <model.h> | |
| 247 #define MY_ID MYSYS | |
| 248 static MAGIC OLDMAGIC = {MY_ID, SHARE_MAGIC}; | |
| 249 static MAGIC NEWMAGIC = {MY_ID, DEMAND_MAGIC}; | |
| 250 #define N_TXTOFF(x) TEXT_OFFSET(x) | |
| 251 #define N_SYMOFF(x) LESYM_OFFSET(x) | |
|
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parents:
3025
diff
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252 static struct exec hdr, ohdr; |
| 428 | 253 |
| 254 #else /* not HPUX */ | |
| 255 | |
|
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Jerry James <james@xemacs.org>
parents:
3025
diff
changeset
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256 #if defined (USG) && !defined (LINUX) |
| 428 | 257 static struct bhdr hdr, ohdr; |
| 258 #define a_magic fmagic | |
| 259 #define a_text tsize | |
| 260 #define a_data dsize | |
| 261 #define a_bss bsize | |
| 262 #define a_syms ssize | |
| 263 #define a_trsize rtsize | |
| 264 #define a_drsize rdsize | |
| 265 #define a_entry entry | |
| 266 #define N_BADMAG(x) \ | |
| 267 (((x).fmagic)!=OMAGIC && ((x).fmagic)!=NMAGIC &&\ | |
| 268 ((x).fmagic)!=FMAGIC && ((x).fmagic)!=IMAGIC) | |
| 269 #define NEWMAGIC FMAGIC | |
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parents:
3025
diff
changeset
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270 #else /* !USG or LINUX */ |
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aa5ed11f473b
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Jerry James <james@xemacs.org>
parents:
3025
diff
changeset
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271 static struct exec hdr, ohdr; |
| 428 | 272 #define NEWMAGIC ZMAGIC |
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4759
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Jerry James <james@xemacs.org>
parents:
3025
diff
changeset
|
273 #endif /* !USG or LINUX */ |
| 428 | 274 #endif /* not HPUX */ |
| 275 | |
| 276 static int unexec_text_start; | |
| 277 static int unexec_data_start; | |
| 278 | |
| 279 #endif /* not COFF */ | |
| 280 | |
| 281 static int pagemask; | |
| 282 | |
| 283 /* Correct an int which is the bit pattern of a pointer to a byte | |
| 284 into an int which is the number of a byte. | |
| 285 This is a no-op on ordinary machines, but not on all. */ | |
| 286 | |
| 287 #ifndef ADDR_CORRECT /* Let m-*.h files override this definition */ | |
| 288 #define ADDR_CORRECT(x) ((char *)(x) - (char*)0) | |
| 289 #endif | |
| 290 | |
| 291 #ifdef emacs | |
| 292 | |
| 293 #include "lisp.h" | |
| 294 | |
| 295 static void | |
| 440 | 296 report_error (const char *file, int fd) |
| 428 | 297 { |
| 298 if (fd) | |
| 299 close (fd); | |
| 563 | 300 report_error_with_errno (Qio_error, "Cannot unexec", |
|
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301 build_extstring (file, Qfile_name)); |
| 428 | 302 } |
| 303 #endif /* emacs */ | |
| 304 | |
| 3025 | 305 #define ERROR0(msg) report_error_1 (new_, msg, 0, 0); return -1 |
| 306 #define ERROR1(msg,x) report_error_1 (new_, msg, x, 0); return -1 | |
| 307 #define ERROR2(msg,x,y) report_error_1 (new_, msg, x, y); return -1 | |
| 428 | 308 |
| 309 static void | |
| 310 report_error_1 (fd, msg, a1, a2) | |
| 311 int fd; | |
| 442 | 312 const char *msg; |
| 428 | 313 int a1, a2; |
| 314 { | |
| 315 close (fd); | |
| 316 #ifdef emacs | |
| 563 | 317 signal_ferror (Qio_error, msg, a1, a2); |
| 428 | 318 #else |
| 319 fprintf (stderr, msg, a1, a2); | |
| 320 fprintf (stderr, "\n"); | |
| 321 #endif | |
| 322 } | |
| 323 | |
| 3025 | 324 static int make_hdr (int new_, int a_out, unsigned data_start, |
| 428 | 325 unsigned bss_start, unsigned entry_address, |
| 326 char *a_name, char *new_name); | |
| 3025 | 327 static int copy_text_and_data (int new_, int a_out); |
| 328 static int copy_sym (int new_, int a_out, char *a_name, char *new_name); | |
| 428 | 329 static void mark_x (char *name); |
| 330 | |
| 331 /* **************************************************************** | |
| 332 * unexec | |
| 333 * | |
| 334 * driving logic. | |
| 335 */ | |
| 336 int | |
| 337 unexec (new_name, a_name, data_start, bss_start, entry_address) | |
| 338 char *new_name, *a_name; | |
| 339 unsigned data_start, bss_start, entry_address; | |
| 340 { | |
| 3025 | 341 int new_, a_out = -1; |
| 428 | 342 |
| 343 if (a_name && (a_out = open (a_name, O_RDONLY)) < 0) | |
| 344 { | |
| 345 PERROR (a_name); | |
| 346 } | |
| 3025 | 347 if ((new_ = creat (new_name, 0666)) < 0) |
| 428 | 348 { |
| 349 PERROR (new_name); | |
| 350 } | |
| 351 | |
| 3025 | 352 if (make_hdr (new_, a_out, data_start, bss_start, entry_address, a_name, new_name) < 0 |
| 353 || copy_text_and_data (new_, a_out) < 0 | |
| 354 || copy_sym (new_, a_out, a_name, new_name) < 0 | |
| 428 | 355 #ifdef COFF |
| 3025 | 356 || adjust_lnnoptrs (new_, a_out, new_name) < 0 |
| 428 | 357 #endif |
| 358 ) | |
| 359 { | |
| 3025 | 360 close (new_); |
| 428 | 361 /* unlink (new_name); / * Failed, unlink new a.out */ |
| 438 | 362 return -1; |
| 428 | 363 } |
| 364 | |
| 3025 | 365 close (new_); |
| 428 | 366 if (a_out >= 0) |
| 367 close (a_out); | |
| 368 mark_x (new_name); | |
| 369 return 0; | |
| 370 } | |
| 371 | |
| 372 /* **************************************************************** | |
| 373 * make_hdr | |
| 374 * | |
| 375 * Make the header in the new a.out from the header in core. | |
| 376 * Modify the text and data sizes. | |
| 377 */ | |
| 378 static int | |
| 3025 | 379 make_hdr (int new_, int a_out, unsigned data_start, unsigned bss_start, |
| 428 | 380 unsigned entry_address, char *a_name, char *new_name) |
| 381 { | |
| 382 #ifdef COFF | |
| 383 auto struct scnhdr f_thdr; /* Text section header */ | |
| 384 auto struct scnhdr f_dhdr; /* Data section header */ | |
| 385 auto struct scnhdr f_bhdr; /* Bss section header */ | |
| 386 auto struct scnhdr scntemp; /* Temporary section header */ | |
| 387 int scns; | |
| 388 #endif /* COFF */ | |
| 389 #ifdef USG_SHARED_LIBRARIES | |
| 390 extern unsigned int bss_end; | |
| 391 #else | |
| 392 unsigned int bss_end; | |
| 393 #endif | |
| 394 | |
| 395 pagemask = getpagesize () - 1; | |
| 396 | |
| 397 /* Adjust text/data boundary. */ | |
| 398 #ifdef NO_REMAP | |
| 399 data_start = (int) start_of_data (); | |
| 400 #else /* not NO_REMAP */ | |
| 401 if (!data_start) | |
| 402 data_start = (int) start_of_data (); | |
| 403 #endif /* not NO_REMAP */ | |
| 404 data_start = ADDR_CORRECT (data_start); | |
| 405 | |
| 406 #ifdef SEGMENT_MASK | |
| 407 data_start = data_start & ~SEGMENT_MASK; /* (Down) to segment boundary. */ | |
| 408 #else | |
| 409 data_start = data_start & ~pagemask; /* (Down) to page boundary. */ | |
| 410 #endif | |
| 411 | |
| 412 bss_end = ADDR_CORRECT (sbrk (0)) + pagemask; | |
| 413 bss_end &= ~ pagemask; | |
| 414 | |
| 415 /* Adjust data/bss boundary. */ | |
| 416 if (bss_start != 0) | |
| 417 { | |
| 418 bss_start = (ADDR_CORRECT (bss_start) + pagemask); | |
| 419 /* (Up) to page bdry. */ | |
| 420 bss_start &= ~ pagemask; | |
| 421 if (bss_start > bss_end) | |
| 422 { | |
| 423 ERROR1 ("unexec: Specified bss_start (%u) is past end of program", | |
| 424 bss_start); | |
| 425 } | |
| 426 } | |
| 427 else | |
| 428 bss_start = bss_end; | |
| 429 | |
| 430 if (data_start > bss_start) /* Can't have negative data size. */ | |
| 431 { | |
| 432 ERROR2 ("unexec: data_start (%u) can't be greater than bss_start (%u)", | |
| 433 data_start, bss_start); | |
| 434 } | |
| 435 | |
| 436 #ifdef COFF | |
| 437 /* Salvage as much info from the existing file as possible */ | |
| 438 if (a_out >= 0) | |
| 439 { | |
| 440 if (read (a_out, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) | |
| 441 { | |
| 442 PERROR (a_name); | |
| 443 } | |
| 444 block_copy_start += sizeof (f_hdr); | |
| 445 if (f_hdr.f_opthdr > 0) | |
| 446 { | |
| 447 if (read (a_out, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) | |
| 448 { | |
| 449 PERROR (a_name); | |
| 450 } | |
| 451 block_copy_start += sizeof (f_ohdr); | |
| 452 } | |
| 453 /* Loop through section headers, copying them in */ | |
| 454 lseek (a_out, sizeof (f_hdr) + f_hdr.f_opthdr, 0); | |
| 455 for (scns = f_hdr.f_nscns; scns > 0; scns--) { | |
| 456 if (read (a_out, &scntemp, sizeof (scntemp)) != sizeof (scntemp)) | |
| 457 { | |
| 458 PERROR (a_name); | |
| 459 } | |
| 460 if (scntemp.s_scnptr > 0L) | |
| 461 { | |
| 462 if (block_copy_start < scntemp.s_scnptr + scntemp.s_size) | |
| 463 block_copy_start = scntemp.s_scnptr + scntemp.s_size; | |
| 464 } | |
| 465 if (strcmp (scntemp.s_name, ".text") == 0) | |
| 466 { | |
| 467 f_thdr = scntemp; | |
| 468 } | |
| 469 else if (strcmp (scntemp.s_name, ".data") == 0) | |
| 470 { | |
| 471 f_dhdr = scntemp; | |
| 472 } | |
| 473 else if (strcmp (scntemp.s_name, ".bss") == 0) | |
| 474 { | |
| 475 f_bhdr = scntemp; | |
| 476 } | |
| 477 } | |
| 478 } | |
| 479 else | |
| 480 { | |
| 481 ERROR0 ("can't build a COFF file from scratch yet"); | |
| 482 } | |
| 483 | |
| 484 /* Now we alter the contents of all the f_*hdr variables | |
| 485 to correspond to what we want to dump. */ | |
| 486 | |
| 487 #ifdef USG_SHARED_LIBRARIES | |
| 488 | |
| 489 /* The amount of data we're adding to the file is distance from the | |
| 490 * end of the original .data space to the current end of the .data | |
| 491 * space. | |
| 492 */ | |
| 493 | |
| 494 bias = bss_start - (f_ohdr.data_start + f_dhdr.s_size); | |
| 495 | |
| 496 #endif | |
| 497 | |
| 498 f_hdr.f_flags |= (F_RELFLG | F_EXEC); | |
| 499 #ifdef EXEC_MAGIC | |
| 500 f_ohdr.magic = EXEC_MAGIC; | |
| 501 #endif | |
| 502 #ifndef NO_REMAP | |
| 503 f_ohdr.text_start = (long) start_of_text (); | |
| 504 f_ohdr.tsize = data_start - f_ohdr.text_start; | |
| 505 f_ohdr.data_start = data_start; | |
| 506 #endif /* NO_REMAP */ | |
| 507 f_ohdr.dsize = bss_start - f_ohdr.data_start; | |
| 508 f_ohdr.bsize = bss_end - bss_start; | |
| 509 /* On some machines, the old values are right. | |
| 510 ??? Maybe on all machines with NO_REMAP. */ | |
| 511 f_thdr.s_size = f_ohdr.tsize; | |
| 512 f_thdr.s_scnptr = sizeof (f_hdr) + sizeof (f_ohdr); | |
| 513 f_thdr.s_scnptr += (f_hdr.f_nscns) * (sizeof (f_thdr)); | |
| 514 lnnoptr = f_thdr.s_lnnoptr; | |
| 515 text_scnptr = f_thdr.s_scnptr; | |
| 516 f_dhdr.s_paddr = f_ohdr.data_start; | |
| 517 f_dhdr.s_vaddr = f_ohdr.data_start; | |
| 518 f_dhdr.s_size = f_ohdr.dsize; | |
| 519 f_dhdr.s_scnptr = f_thdr.s_scnptr + f_thdr.s_size; | |
| 520 data_scnptr = f_dhdr.s_scnptr; | |
| 521 f_bhdr.s_paddr = f_ohdr.data_start + f_ohdr.dsize; | |
| 522 f_bhdr.s_vaddr = f_ohdr.data_start + f_ohdr.dsize; | |
| 523 f_bhdr.s_size = f_ohdr.bsize; | |
| 524 f_bhdr.s_scnptr = 0L; | |
| 525 #ifndef USG_SHARED_LIBRARIES | |
| 526 bias = f_dhdr.s_scnptr + f_dhdr.s_size - block_copy_start; | |
| 527 #endif | |
| 528 | |
| 529 if (f_hdr.f_symptr > 0L) | |
| 530 { | |
| 531 f_hdr.f_symptr += bias; | |
| 532 } | |
| 533 | |
| 534 if (f_thdr.s_lnnoptr > 0L) | |
| 535 { | |
| 536 f_thdr.s_lnnoptr += bias; | |
| 537 } | |
| 538 | |
| 539 #ifdef ADJUST_EXEC_HEADER | |
| 540 ADJUST_EXEC_HEADER; | |
| 541 #endif /* ADJUST_EXEC_HEADER */ | |
| 542 | |
| 3025 | 543 if (write (new_, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) |
| 428 | 544 { |
| 545 PERROR (new_name); | |
| 546 } | |
| 547 | |
| 3025 | 548 if (write (new_, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) |
| 428 | 549 { |
| 550 PERROR (new_name); | |
| 551 } | |
| 552 | |
| 553 #ifndef USG_SHARED_LIBRARIES | |
| 554 | |
| 3025 | 555 if (write (new_, &f_thdr, sizeof (f_thdr)) != sizeof (f_thdr)) |
| 428 | 556 { |
| 557 PERROR (new_name); | |
| 558 } | |
| 559 | |
| 3025 | 560 if (write (new_, &f_dhdr, sizeof (f_dhdr)) != sizeof (f_dhdr)) |
| 428 | 561 { |
| 562 PERROR (new_name); | |
| 563 } | |
| 564 | |
| 3025 | 565 if (write (new_, &f_bhdr, sizeof (f_bhdr)) != sizeof (f_bhdr)) |
| 428 | 566 { |
| 567 PERROR (new_name); | |
| 568 } | |
| 569 | |
| 570 #else /* USG_SHARED_LIBRARIES */ | |
| 571 | |
| 572 /* The purpose of this code is to write out the new file's section | |
| 573 * header table. | |
| 574 * | |
| 575 * Scan through the original file's sections. If the encountered | |
| 576 * section is one we know (.text, .data or .bss), write out the | |
| 577 * correct header. If it is a section we do not know (such as | |
| 578 * .lib), adjust the address of where the section data is in the | |
| 579 * file, and write out the header. | |
| 580 * | |
| 581 * If any section precedes .text or .data in the file, this code | |
| 582 * will not adjust the file pointer for that section correctly. | |
| 583 */ | |
| 584 | |
| 585 /* This used to use sizeof (f_ohdr) instead of .f_opthdr. | |
| 586 .f_opthdr is said to be right when there is no optional header. */ | |
| 587 lseek (a_out, sizeof (f_hdr) + f_hdr.f_opthdr, 0); | |
| 588 | |
| 589 for (scns = f_hdr.f_nscns; scns > 0; scns--) | |
| 590 { | |
| 591 if (read (a_out, &scntemp, sizeof (scntemp)) != sizeof (scntemp)) | |
| 592 PERROR (a_name); | |
| 593 | |
| 594 if (!strcmp (scntemp.s_name, f_thdr.s_name)) /* .text */ | |
| 595 { | |
| 3025 | 596 if (write (new_, &f_thdr, sizeof (f_thdr)) != sizeof (f_thdr)) |
| 428 | 597 PERROR (new_name); |
| 598 } | |
| 599 else if (!strcmp (scntemp.s_name, f_dhdr.s_name)) /* .data */ | |
| 600 { | |
| 3025 | 601 if (write (new_, &f_dhdr, sizeof (f_dhdr)) != sizeof (f_dhdr)) |
| 428 | 602 PERROR (new_name); |
| 603 } | |
| 604 else if (!strcmp (scntemp.s_name, f_bhdr.s_name)) /* .bss */ | |
| 605 { | |
| 3025 | 606 if (write (new_, &f_bhdr, sizeof (f_bhdr)) != sizeof (f_bhdr)) |
| 428 | 607 PERROR (new_name); |
| 608 } | |
| 609 else | |
| 610 { | |
| 611 if (scntemp.s_scnptr) | |
| 612 scntemp.s_scnptr += bias; | |
| 3025 | 613 if (write (new_, &scntemp, sizeof (scntemp)) != sizeof (scntemp)) |
| 428 | 614 PERROR (new_name); |
| 615 } | |
| 616 } | |
| 617 #endif /* USG_SHARED_LIBRARIES */ | |
| 618 | |
| 619 return (0); | |
| 620 | |
| 621 #else /* if not COFF */ | |
| 622 | |
| 623 /* Get symbol table info from header of a.out file if given one. */ | |
| 624 if (a_out >= 0) | |
| 625 { | |
| 647 | 626 if (read (a_out, (char *) &ohdr, sizeof (hdr)) != sizeof (hdr)) |
| 428 | 627 { |
| 628 PERROR (a_name); | |
| 629 } | |
| 630 | |
| 631 if (N_BADMAG (ohdr)) | |
| 632 { | |
| 633 ERROR1 ("invalid magic number in %s", a_name); | |
| 634 } | |
| 635 hdr = ohdr; | |
| 636 } | |
| 637 else | |
| 638 { | |
| 647 | 639 memset ((void *)&hdr, 0, sizeof (hdr)); |
| 428 | 640 } |
| 641 | |
| 642 unexec_text_start = (long) start_of_text (); | |
| 643 unexec_data_start = data_start; | |
| 644 | |
| 645 /* Machine-dependent fixup for header, or maybe for unexec_text_start */ | |
| 646 #ifdef ADJUST_EXEC_HEADER | |
| 647 ADJUST_EXEC_HEADER; | |
| 648 #endif /* ADJUST_EXEC_HEADER */ | |
| 649 | |
| 650 hdr.a_trsize = 0; | |
| 651 hdr.a_drsize = 0; | |
| 652 if (entry_address != 0) | |
| 653 hdr.a_entry = entry_address; | |
| 654 | |
| 655 hdr.a_bss = bss_end - bss_start; | |
| 656 hdr.a_data = bss_start - data_start; | |
| 657 #ifdef NO_REMAP | |
| 658 hdr.a_text = ohdr.a_text; | |
| 659 #else /* not NO_REMAP */ | |
| 660 hdr.a_text = data_start - unexec_text_start; | |
| 661 | |
| 662 #ifdef A_TEXT_OFFSET | |
| 663 hdr.a_text += A_TEXT_OFFSET (ohdr); | |
| 664 #endif | |
| 665 | |
| 666 #endif /* not NO_REMAP */ | |
| 667 | |
| 3025 | 668 if (write (new_, (char *) &hdr, sizeof (hdr)) != sizeof (hdr)) |
| 428 | 669 { |
| 670 PERROR (new_name); | |
| 671 } | |
| 672 | |
| 673 #if 0 /* This #ifndef caused a bug on Linux when using QMAGIC. */ | |
| 674 /* This adjustment was done above only #ifndef NO_REMAP, | |
| 675 so only undo it now #ifndef NO_REMAP. */ | |
| 676 /* #ifndef NO_REMAP */ | |
| 677 #endif | |
| 678 #ifdef A_TEXT_OFFSET | |
| 679 hdr.a_text -= A_TEXT_OFFSET (ohdr); | |
| 680 #endif | |
| 681 | |
| 682 return 0; | |
| 683 | |
| 684 #endif /* not COFF */ | |
| 685 } | |
| 686 | |
| 687 static void write_segment (int, char *, char *); | |
| 688 | |
| 689 /* **************************************************************** | |
| 690 * copy_text_and_data | |
| 691 * | |
| 692 * Copy the text and data segments from memory to the new a.out | |
| 693 */ | |
| 694 static int | |
| 3025 | 695 copy_text_and_data (int new_, |
| 2286 | 696 #if defined (COFF) && defined (USG_SHARED_LIBRARIES) |
| 697 int a_out | |
| 698 #else | |
| 699 int UNUSED (a_out) | |
| 700 #endif | |
| 701 ) | |
| 428 | 702 { |
| 703 char *end; | |
| 704 char *ptr; | |
| 705 | |
| 706 #ifdef COFF | |
| 707 | |
| 708 #ifdef USG_SHARED_LIBRARIES | |
| 709 | |
| 710 int scns; | |
| 711 struct scnhdr scntemp; /* Temporary section header */ | |
| 712 | |
| 713 /* The purpose of this code is to write out the new file's section | |
| 714 * contents. | |
| 715 * | |
| 716 * Step through the section table. If we know the section (.text, | |
| 717 * .data) do the appropriate thing. Otherwise, if the section has | |
| 718 * no allocated space in the file (.bss), do nothing. Otherwise, | |
| 719 * the section has space allocated in the file, and is not a section | |
| 720 * we know. So just copy it. | |
| 721 */ | |
| 722 | |
| 723 lseek (a_out, sizeof (struct filehdr) + sizeof (struct aouthdr), 0); | |
| 724 | |
| 725 for (scns = f_hdr.f_nscns; scns > 0; scns--) | |
| 726 { | |
| 727 if (read (a_out, &scntemp, sizeof (scntemp)) != sizeof (scntemp)) | |
| 728 PERROR ("temacs"); | |
| 729 | |
| 730 if (!strcmp (scntemp.s_name, ".text")) | |
| 731 { | |
| 3025 | 732 lseek (new_, (long) text_scnptr, 0); |
| 428 | 733 ptr = (char *) f_ohdr.text_start; |
| 734 end = ptr + f_ohdr.tsize; | |
| 3025 | 735 write_segment (new_, ptr, end); |
| 428 | 736 } |
| 737 else if (!strcmp (scntemp.s_name, ".data")) | |
| 738 { | |
| 3025 | 739 lseek (new_, (long) data_scnptr, 0); |
| 428 | 740 ptr = (char *) f_ohdr.data_start; |
| 741 end = ptr + f_ohdr.dsize; | |
| 3025 | 742 write_segment (new_, ptr, end); |
| 428 | 743 } |
| 744 else if (!scntemp.s_scnptr) | |
| 745 ; /* do nothing - no data for this section */ | |
| 746 else | |
| 747 { | |
| 748 char page[BUFSIZ]; | |
| 749 int size, n; | |
| 750 long old_a_out_ptr = lseek (a_out, 0, 1); | |
| 751 | |
| 752 lseek (a_out, scntemp.s_scnptr, 0); | |
| 753 for (size = scntemp.s_size; size > 0; size -= sizeof (page)) | |
| 754 { | |
| 755 n = size > sizeof (page) ? sizeof (page) : size; | |
| 3025 | 756 if (read (a_out, page, n) != n || write (new_, page, n) != n) |
| 428 | 757 PERROR ("emacs"); |
| 758 } | |
| 759 lseek (a_out, old_a_out_ptr, 0); | |
| 760 } | |
| 761 } | |
| 762 | |
| 763 #else /* COFF, but not USG_SHARED_LIBRARIES */ | |
| 764 | |
| 3025 | 765 lseek (new_, (long) text_scnptr, 0); |
| 428 | 766 ptr = (char *) f_ohdr.text_start; |
| 767 end = ptr + f_ohdr.tsize; | |
| 3025 | 768 write_segment (new_, ptr, end); |
| 428 | 769 |
| 3025 | 770 lseek (new_, (long) data_scnptr, 0); |
| 428 | 771 ptr = (char *) f_ohdr.data_start; |
| 772 end = ptr + f_ohdr.dsize; | |
| 3025 | 773 write_segment (new_, ptr, end); |
| 428 | 774 |
| 775 #endif /* USG_SHARED_LIBRARIES */ | |
| 776 | |
| 777 #else /* if not COFF */ | |
| 778 | |
| 779 /* Some machines count the header as part of the text segment. | |
| 780 That is to say, the header appears in core | |
| 781 just before the address that start_of_text returns. | |
| 782 For them, N_TXTOFF is the place where the header goes. | |
| 783 We must adjust the seek to the place after the header. | |
| 784 Note that at this point hdr.a_text does *not* count | |
| 785 the extra A_TEXT_OFFSET bytes, only the actual bytes of code. */ | |
| 786 | |
| 787 #ifdef A_TEXT_SEEK | |
| 3025 | 788 lseek (new_, (long) A_TEXT_SEEK (hdr), 0); |
| 428 | 789 #else |
| 3025 | 790 lseek (new_, (long) N_TXTOFF (hdr), 0); |
| 428 | 791 #endif /* no A_TEXT_SEEK */ |
| 792 | |
| 793 ptr = (char *) unexec_text_start; | |
| 794 end = ptr + hdr.a_text; | |
| 3025 | 795 write_segment (new_, ptr, end); |
| 428 | 796 |
| 797 ptr = (char *) unexec_data_start; | |
| 798 end = ptr + hdr.a_data; | |
| 799 /* This lseek is certainly incorrect when A_TEXT_OFFSET | |
| 800 and I believe it is a no-op otherwise. | |
| 801 Let's see if its absence ever fails. */ | |
| 3025 | 802 /* lseek (new_, (long) N_TXTOFF (hdr) + hdr.a_text, 0); */ |
| 803 write_segment (new_, ptr, end); | |
| 428 | 804 |
| 805 #endif /* not COFF */ | |
| 806 | |
| 807 return 0; | |
| 808 } | |
| 809 | |
| 810 static void | |
| 3025 | 811 write_segment (new_, ptr, end) |
| 812 int new_; | |
| 428 | 813 char *ptr, *end; |
| 814 { | |
| 815 int i, nwrite, ret; | |
| 816 #if 0 | |
| 817 char buf[80]; | |
| 818 #endif | |
| 819 /* This is the normal amount to write at once. | |
| 820 It is the size of block that NFS uses. */ | |
| 821 int writesize = 1 << 13; | |
| 822 int pagesize = getpagesize (); | |
| 823 char zeros[1 << 13]; | |
| 824 | |
| 825 memset (zeros, 0, sizeof (zeros)); | |
| 826 | |
| 827 for (i = 0; ptr < end;) | |
| 828 { | |
| 829 /* Distance to next multiple of writesize. */ | |
| 830 nwrite = (((int) ptr + writesize) & -writesize) - (int) ptr; | |
| 831 /* But not beyond specified end. */ | |
| 832 if (nwrite > end - ptr) nwrite = end - ptr; | |
| 3025 | 833 ret = write (new_, ptr, nwrite); |
| 428 | 834 /* If write gets a page fault, it means we reached |
| 835 a gap between the old text segment and the old data segment. | |
| 836 This gap has probably been remapped into part of the text segment. | |
| 837 So write zeros for it. */ | |
| 838 if (ret == -1 | |
| 839 #ifdef EFAULT | |
| 840 && errno == EFAULT | |
| 841 #endif | |
| 842 ) | |
| 843 { | |
| 844 /* Write only a page of zeros at once, | |
| 845 so that we don't overshoot the start | |
| 846 of the valid memory in the old data segment. */ | |
| 847 if (nwrite > pagesize) | |
| 848 nwrite = pagesize; | |
| 3025 | 849 write (new_, zeros, nwrite); |
| 428 | 850 } |
| 851 #if 0 /* Now that we have can ask `write' to write more than a page, | |
| 852 it is legit for write do less than the whole amount specified. */ | |
| 853 else if (nwrite != ret) | |
| 854 { | |
| 855 sprintf (buf, | |
| 856 "unexec write failure: addr 0x%lx, fileno %d, size 0x%x, wrote 0x%x, errno %d", | |
| 3025 | 857 (unsigned long) ptr, new_, nwrite, ret, errno); |
| 428 | 858 PERROR (buf); |
| 859 } | |
| 860 #endif | |
| 861 i += nwrite; | |
| 862 ptr += nwrite; | |
| 863 } | |
| 864 } | |
| 865 | |
| 866 /* **************************************************************** | |
| 867 * copy_sym | |
| 868 * | |
| 869 * Copy the relocation information and symbol table from the a.out to the new | |
| 870 */ | |
| 871 static int | |
| 3025 | 872 copy_sym (int new_, int a_out, char *a_name, char *new_name) |
| 428 | 873 { |
| 874 char page[1024]; | |
| 875 int n; | |
| 876 | |
| 877 if (a_out < 0) | |
| 878 return 0; | |
| 879 | |
| 880 #ifdef COFF | |
| 881 if (SYMS_START == 0L) | |
| 882 return 0; | |
| 883 #endif /* COFF */ | |
| 884 | |
| 885 #ifdef COFF | |
| 886 if (lnnoptr) /* if there is line number info */ | |
| 887 lseek (a_out, lnnoptr, 0); /* start copying from there */ | |
| 888 else | |
| 889 #endif /* COFF */ | |
| 890 lseek (a_out, SYMS_START, 0); /* Position a.out to symtab. */ | |
| 891 | |
| 647 | 892 while ((n = read (a_out, page, sizeof (page))) > 0) |
| 428 | 893 { |
| 3025 | 894 if (write (new_, page, n) != n) |
| 428 | 895 { |
| 896 PERROR (new_name); | |
| 897 } | |
| 898 } | |
| 899 if (n < 0) | |
| 900 { | |
| 901 PERROR (a_name); | |
| 902 } | |
| 903 return 0; | |
| 904 } | |
| 905 | |
| 906 /* **************************************************************** | |
| 907 * mark_x | |
| 908 * | |
| 909 * After successfully building the new a.out, mark it executable | |
| 910 */ | |
| 911 static void | |
| 912 mark_x (char *name) | |
| 913 { | |
| 914 struct stat sbuf; | |
| 915 int um; | |
| 3025 | 916 int new_ = 0; /* for PERROR */ |
| 428 | 917 |
| 918 um = umask (777); | |
| 919 umask (um); | |
| 920 if (stat (name, &sbuf) == -1) | |
| 921 { | |
| 922 PERROR (name); | |
| 923 } | |
| 924 sbuf.st_mode |= 0111 & ~um; | |
| 925 if (chmod (name, sbuf.st_mode) == -1) | |
| 926 PERROR (name); | |
| 927 } | |
| 928 | |
| 929 #ifdef COFF | |
| 930 /* | |
| 931 * If the COFF file contains a symbol table and a line number section, | |
| 932 * then any auxiliary entries that have values for x_lnnoptr must | |
| 933 * be adjusted by the amount that the line number section has moved | |
| 934 * in the file (bias computed in make_hdr). The #@$%&* designers of | |
| 935 * the auxiliary entry structures used the absolute file offsets for | |
| 936 * the line number entry rather than an offset from the start of the | |
| 937 * line number section! | |
| 938 * | |
| 939 * When I figure out how to scan through the symbol table and pick out | |
| 940 * the auxiliary entries that need adjustment, this routine will | |
| 941 * be fixed. As it is now, all such entries are wrong and sdb | |
| 942 * will complain. Fred Fish, UniSoft Systems Inc. | |
| 943 */ | |
| 944 | |
| 945 /* This function is probably very slow. Instead of reopening the new | |
| 946 file for input and output it should copy from the old to the new | |
| 947 using the two descriptors already open (WRITEDESC and READDESC). | |
| 948 Instead of reading one small structure at a time it should use | |
| 949 a reasonable size buffer. But I don't have time to work on such | |
| 950 things, so I am installing it as submitted to me. -- RMS. */ | |
| 951 | |
| 952 int | |
| 953 adjust_lnnoptrs (writedesc, readdesc, new_name) | |
| 2286 | 954 int UNUSED (writedesc); |
| 955 int UNUSED (readdesc); | |
| 428 | 956 char *new_name; |
| 957 { | |
| 958 int nsyms; | |
| 3025 | 959 int new_; |
|
4759
aa5ed11f473b
Remove support for obsolete systems. See xemacs-patches message with ID
Jerry James <james@xemacs.org>
parents:
3025
diff
changeset
|
960 #if defined defined (pfa) |
| 428 | 961 SYMENT symentry; |
| 962 AUXENT auxentry; | |
| 963 #else | |
| 964 struct syment symentry; | |
| 965 union auxent auxentry; | |
| 966 #endif | |
| 967 | |
| 968 if (!lnnoptr || !f_hdr.f_symptr) | |
| 969 return 0; | |
| 970 | |
| 3025 | 971 if ((new_ = open (new_name, O_RDWR)) < 0) |
| 428 | 972 { |
| 973 PERROR (new_name); | |
| 974 return -1; | |
| 975 } | |
| 976 | |
| 3025 | 977 lseek (new_, f_hdr.f_symptr, 0); |
| 428 | 978 for (nsyms = 0; nsyms < f_hdr.f_nsyms; nsyms++) |
| 979 { | |
| 3025 | 980 read (new_, &symentry, SYMESZ); |
| 428 | 981 if (symentry.n_numaux) |
| 982 { | |
| 3025 | 983 read (new_, &auxentry, AUXESZ); |
| 428 | 984 nsyms++; |
| 985 if (ISFCN (symentry.n_type) || symentry.n_type == 0x2400) | |
| 986 { | |
| 987 auxentry.x_sym.x_fcnary.x_fcn.x_lnnoptr += bias; | |
| 3025 | 988 lseek (new_, -AUXESZ, 1); |
| 989 write (new_, &auxentry, AUXESZ); | |
| 428 | 990 } |
| 991 } | |
| 992 } | |
| 3025 | 993 close (new_); |
| 428 | 994 return 0; |
| 995 } | |
| 996 | |
| 997 #endif /* COFF */ |