Mercurial > hg > xemacs-beta
annotate src/unexec.c @ 5602:c9e5612f5424
Support the MP library on recent FreeBSD, have it pass relevant tests.
src/ChangeLog addition:
2011-11-26 Aidan Kehoe <kehoea@parhasard.net>
* number-mp.c (bignum_to_string):
Don't overwrite the accumulator we've just set up for this
function.
* number-mp.c (BIGNUM_TO_TYPE):
mp_itom() doesn't necessarily do what this code used to think with
negative numbers, it can treat them as unsigned ints. Subtract
numbers from bignum_zero instead of multiplying them by -1 to
convert them to their negative equivalents.
* number-mp.c (bignum_to_int):
* number-mp.c (bignum_to_uint):
* number-mp.c (bignum_to_long):
* number-mp.c (bignum_to_ulong):
* number-mp.c (bignum_to_double):
Use the changed BIGNUM_TO_TYPE() in these functions.
* number-mp.c (bignum_ceil):
* number-mp.c (bignum_floor):
In these functions, be more careful about rounding to positive and
negative infinity, respectively. Don't use the sign of QUOTIENT
when working out out whether to add or subtract one, rather use
the sign QUOTIENT would have if arbitrary-precision division were
done.
* number-mp.h:
* number-mp.h (MP_GCD):
Wrap #include <mp.h> in BEGIN_C_DECLS/END_C_DECLS.
* number.c (Fbigfloat_get_precision):
* number.c (Fbigfloat_set_precision):
Don't attempt to call XBIGFLOAT_GET_PREC if this build doesn't
support big floats.
| author | Aidan Kehoe <kehoea@parhasard.net> |
|---|---|
| date | Sat, 26 Nov 2011 17:59:14 +0000 |
| 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 */ |