Commit | Line | Data |
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acaf905b | 1 | /* Copyright (C) 1985-1988, 1992-1994, 2001-2012 Free Software Foundation, Inc. |
7dd63af1 RS |
2 | |
3 | This file is part of GNU Emacs. | |
4 | ||
9ec0b715 | 5 | GNU Emacs is free software: you can redistribute it and/or modify |
7dd63af1 | 6 | it under the terms of the GNU General Public License as published by |
9ec0b715 GM |
7 | the Free Software Foundation, either version 3 of the License, or |
8 | (at your option) any later version. | |
7dd63af1 RS |
9 | |
10 | GNU Emacs is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
9ec0b715 | 16 | along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */ |
7dd63af1 RS |
17 | |
18 | ||
19 | /* | |
29cf3e20 EZ |
20 | * unexcoff.c - Convert a running program into an a.out or COFF file. |
21 | * | |
22 | * ================================================================== | |
23 | * Note: This file is currently used only by the MSDOS (a.k.a. DJGPP) | |
24 | * build of Emacs. If you are not interested in the MSDOS build, you | |
25 | * are looking at the wrong version of unexec! | |
26 | * ================================================================== | |
7dd63af1 RS |
27 | * |
28 | * Author: Spencer W. Thomas | |
29 | * Computer Science Dept. | |
30 | * University of Utah | |
31 | * Date: Tue Mar 2 1982 | |
29cf3e20 | 32 | * Originally under the name unexec.c. |
7dd63af1 RS |
33 | * Modified heavily since then. |
34 | * | |
35 | * Synopsis: | |
dd5ecd6b | 36 | * unexec (const char *new_name, const char *old_name); |
7dd63af1 RS |
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 | * | |
7dd63af1 RS |
43 | * If you make improvements I'd like to get them too. |
44 | * harpo!utah-cs!thomas, thomas@Utah-20 | |
45 | * | |
46 | */ | |
47 | ||
48 | /* Modified to support SysVr3 shared libraries by James Van Artsdalen | |
49 | * of Dell Computer Corporation. james@bigtex.cactus.org. | |
50 | */ | |
51 | ||
18160b98 | 52 | #include <config.h> |
ce701a33 PE |
53 | #include "unexec.h" |
54 | ||
7dd63af1 | 55 | #define PERROR(file) report_error (file, new) |
7dd63af1 RS |
56 | |
57 | #ifndef CANNOT_DUMP /* all rest of file! */ | |
58 | ||
f914a6bf | 59 | #ifdef HAVE_COFF_H |
2a4487ac | 60 | #include <coff.h> |
3680bdc6 | 61 | #ifdef MSDOS |
8eb2807f | 62 | #include <fcntl.h> /* for O_RDONLY, O_RDWR */ |
c17a2102 | 63 | #include <crt0.h> /* for _crt0_startup_flags and its bits */ |
5f2f0bc1 | 64 | #include <sys/exceptn.h> |
c17a2102 | 65 | static int save_djgpp_startup_flags; |
3680bdc6 RS |
66 | #define filehdr external_filehdr |
67 | #define scnhdr external_scnhdr | |
68 | #define syment external_syment | |
69 | #define auxent external_auxent | |
70 | #define n_numaux e_numaux | |
71 | #define n_type e_type | |
72 | struct aouthdr | |
73 | { | |
234d3183 RS |
74 | unsigned short magic; /* type of file */ |
75 | unsigned short vstamp; /* version stamp */ | |
76 | unsigned long tsize; /* text size in bytes, padded to FW bdry*/ | |
77 | unsigned long dsize; /* initialized data " " */ | |
78 | unsigned long bsize; /* uninitialized data " " */ | |
79 | unsigned long entry; /* entry pt. */ | |
80 | unsigned long text_start;/* base of text used for this file */ | |
81 | unsigned long data_start;/* base of data used for this file */ | |
3680bdc6 | 82 | }; |
3680bdc6 | 83 | #endif /* not MSDOS */ |
f914a6bf | 84 | #else /* not HAVE_COFF_H */ |
8d228cb0 | 85 | #include <a.out.h> |
f914a6bf | 86 | #endif /* not HAVE_COFF_H */ |
265a9e55 | 87 | |
f34e2e18 RS |
88 | /* Define getpagesize if the system does not. |
89 | Note that this may depend on symbols defined in a.out.h. */ | |
7dd63af1 RS |
90 | #include "getpagesize.h" |
91 | ||
92 | #ifndef makedev /* Try to detect types.h already loaded */ | |
93 | #include <sys/types.h> | |
265a9e55 | 94 | #endif /* makedev */ |
7dd63af1 RS |
95 | #include <stdio.h> |
96 | #include <sys/stat.h> | |
97 | #include <errno.h> | |
98 | ||
f914a6bf | 99 | #include <sys/file.h> |
2d30a233 | 100 | |
22d7feb2 | 101 | #include "mem-limits.h" |
7dd63af1 | 102 | |
7dd63af1 RS |
103 | static long block_copy_start; /* Old executable start point */ |
104 | static struct filehdr f_hdr; /* File header */ | |
105 | static struct aouthdr f_ohdr; /* Optional file header (a.out) */ | |
106 | long bias; /* Bias to add for growth */ | |
107 | long lnnoptr; /* Pointer to line-number info within file */ | |
108 | #define SYMS_START block_copy_start | |
109 | ||
110 | static long text_scnptr; | |
111 | static long data_scnptr; | |
112 | ||
c8b14b5f RS |
113 | static long coff_offset; |
114 | ||
7dd63af1 RS |
115 | static int pagemask; |
116 | ||
117 | /* Correct an int which is the bit pattern of a pointer to a byte | |
118 | into an int which is the number of a byte. | |
119 | This is a no-op on ordinary machines, but not on all. */ | |
120 | ||
7dd63af1 | 121 | #define ADDR_CORRECT(x) ((char *)(x) - (char*)0) |
7dd63af1 | 122 | |
2d30a233 RM |
123 | #include "lisp.h" |
124 | ||
5f2f0bc1 EZ |
125 | static void |
126 | report_error (const char *file, int fd) | |
7dd63af1 RS |
127 | { |
128 | if (fd) | |
129 | close (fd); | |
2d30a233 | 130 | report_file_error ("Cannot unexec", Fcons (build_string (file), Qnil)); |
7dd63af1 | 131 | } |
7dd63af1 RS |
132 | |
133 | #define ERROR0(msg) report_error_1 (new, msg, 0, 0); return -1 | |
134 | #define ERROR1(msg,x) report_error_1 (new, msg, x, 0); return -1 | |
135 | #define ERROR2(msg,x,y) report_error_1 (new, msg, x, y); return -1 | |
136 | ||
5f2f0bc1 EZ |
137 | static void |
138 | report_error_1 (int fd, const char *msg, int a1, int a2) | |
7dd63af1 RS |
139 | { |
140 | close (fd); | |
7dd63af1 | 141 | error (msg, a1, a2); |
7dd63af1 RS |
142 | } |
143 | \f | |
c3911ead | 144 | static int make_hdr (int, int, const char *, const char *); |
5f2f0bc1 EZ |
145 | static int copy_text_and_data (int, int); |
146 | static int copy_sym (int, int, const char *, const char *); | |
147 | static void mark_x (const char *); | |
7dd63af1 | 148 | |
7dd63af1 RS |
149 | /* **************************************************************** |
150 | * make_hdr | |
151 | * | |
152 | * Make the header in the new a.out from the header in core. | |
153 | * Modify the text and data sizes. | |
154 | */ | |
155 | static int | |
dd5ecd6b DN |
156 | make_hdr (int new, int a_out, |
157 | const char *a_name, const char *new_name) | |
7dd63af1 | 158 | { |
7dd63af1 RS |
159 | auto struct scnhdr f_thdr; /* Text section header */ |
160 | auto struct scnhdr f_dhdr; /* Data section header */ | |
161 | auto struct scnhdr f_bhdr; /* Bss section header */ | |
162 | auto struct scnhdr scntemp; /* Temporary section header */ | |
163 | register int scns; | |
dd5ecd6b DN |
164 | unsigned int bss_start; |
165 | unsigned int data_start; | |
7dd63af1 RS |
166 | |
167 | pagemask = getpagesize () - 1; | |
168 | ||
169 | /* Adjust text/data boundary. */ | |
7dd63af1 | 170 | data_start = (int) start_of_data (); |
7dd63af1 | 171 | data_start = ADDR_CORRECT (data_start); |
7dd63af1 | 172 | data_start = data_start & ~pagemask; /* (Down) to page boundary. */ |
7dd63af1 | 173 | |
dd5ecd6b DN |
174 | bss_start = ADDR_CORRECT (sbrk (0)) + pagemask; |
175 | bss_start &= ~ pagemask; | |
7dd63af1 RS |
176 | |
177 | if (data_start > bss_start) /* Can't have negative data size. */ | |
178 | { | |
179 | ERROR2 ("unexec: data_start (%u) can't be greater than bss_start (%u)", | |
180 | data_start, bss_start); | |
181 | } | |
182 | ||
c8b14b5f RS |
183 | coff_offset = 0L; /* stays zero, except in DJGPP */ |
184 | ||
7dd63af1 RS |
185 | /* Salvage as much info from the existing file as possible */ |
186 | if (a_out >= 0) | |
187 | { | |
c8b14b5f | 188 | #ifdef MSDOS |
c8b14b5f RS |
189 | /* Support the coff-go32-exe format with a prepended stub, since |
190 | this is what GCC 2.8.0 and later generates by default in DJGPP. */ | |
191 | unsigned short mz_header[3]; | |
192 | ||
193 | if (read (a_out, &mz_header, sizeof (mz_header)) != sizeof (mz_header)) | |
194 | { | |
195 | PERROR (a_name); | |
196 | } | |
197 | if (mz_header[0] == 0x5a4d || mz_header[0] == 0x4d5a) /* "MZ" or "ZM" */ | |
198 | { | |
199 | coff_offset = (long)mz_header[2] * 512L; | |
200 | if (mz_header[1]) | |
201 | coff_offset += (long)mz_header[1] - 512L; | |
202 | lseek (a_out, coff_offset, 0); | |
203 | } | |
204 | else | |
205 | lseek (a_out, 0L, 0); | |
c8b14b5f | 206 | #endif /* MSDOS */ |
7dd63af1 RS |
207 | if (read (a_out, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) |
208 | { | |
209 | PERROR (a_name); | |
210 | } | |
211 | block_copy_start += sizeof (f_hdr); | |
212 | if (f_hdr.f_opthdr > 0) | |
213 | { | |
214 | if (read (a_out, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) | |
215 | { | |
216 | PERROR (a_name); | |
217 | } | |
218 | block_copy_start += sizeof (f_ohdr); | |
219 | } | |
220 | /* Loop through section headers, copying them in */ | |
c8b14b5f | 221 | lseek (a_out, coff_offset + sizeof (f_hdr) + f_hdr.f_opthdr, 0); |
7dd63af1 RS |
222 | for (scns = f_hdr.f_nscns; scns > 0; scns--) { |
223 | if (read (a_out, &scntemp, sizeof (scntemp)) != sizeof (scntemp)) | |
224 | { | |
225 | PERROR (a_name); | |
226 | } | |
227 | if (scntemp.s_scnptr > 0L) | |
228 | { | |
229 | if (block_copy_start < scntemp.s_scnptr + scntemp.s_size) | |
230 | block_copy_start = scntemp.s_scnptr + scntemp.s_size; | |
231 | } | |
232 | if (strcmp (scntemp.s_name, ".text") == 0) | |
233 | { | |
234 | f_thdr = scntemp; | |
235 | } | |
236 | else if (strcmp (scntemp.s_name, ".data") == 0) | |
237 | { | |
238 | f_dhdr = scntemp; | |
239 | } | |
240 | else if (strcmp (scntemp.s_name, ".bss") == 0) | |
241 | { | |
242 | f_bhdr = scntemp; | |
243 | } | |
244 | } | |
245 | } | |
246 | else | |
247 | { | |
248 | ERROR0 ("can't build a COFF file from scratch yet"); | |
249 | } | |
250 | ||
251 | /* Now we alter the contents of all the f_*hdr variables | |
252 | to correspond to what we want to dump. */ | |
253 | ||
7dd63af1 | 254 | f_hdr.f_flags |= (F_RELFLG | F_EXEC); |
7dd63af1 | 255 | f_ohdr.dsize = bss_start - f_ohdr.data_start; |
dd5ecd6b | 256 | f_ohdr.bsize = 0; |
7dd63af1 RS |
257 | f_thdr.s_size = f_ohdr.tsize; |
258 | f_thdr.s_scnptr = sizeof (f_hdr) + sizeof (f_ohdr); | |
259 | f_thdr.s_scnptr += (f_hdr.f_nscns) * (sizeof (f_thdr)); | |
7dd63af1 | 260 | lnnoptr = f_thdr.s_lnnoptr; |
7dd63af1 | 261 | text_scnptr = f_thdr.s_scnptr; |
7dd63af1 | 262 | f_dhdr.s_paddr = f_ohdr.data_start; |
7dd63af1 RS |
263 | f_dhdr.s_vaddr = f_ohdr.data_start; |
264 | f_dhdr.s_size = f_ohdr.dsize; | |
265 | f_dhdr.s_scnptr = f_thdr.s_scnptr + f_thdr.s_size; | |
7dd63af1 | 266 | data_scnptr = f_dhdr.s_scnptr; |
7dd63af1 | 267 | f_bhdr.s_paddr = f_ohdr.data_start + f_ohdr.dsize; |
7dd63af1 RS |
268 | f_bhdr.s_vaddr = f_ohdr.data_start + f_ohdr.dsize; |
269 | f_bhdr.s_size = f_ohdr.bsize; | |
270 | f_bhdr.s_scnptr = 0L; | |
7dd63af1 | 271 | bias = f_dhdr.s_scnptr + f_dhdr.s_size - block_copy_start; |
7dd63af1 RS |
272 | |
273 | if (f_hdr.f_symptr > 0L) | |
274 | { | |
275 | f_hdr.f_symptr += bias; | |
276 | } | |
277 | ||
278 | if (f_thdr.s_lnnoptr > 0L) | |
279 | { | |
280 | f_thdr.s_lnnoptr += bias; | |
281 | } | |
282 | ||
7dd63af1 RS |
283 | if (write (new, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) |
284 | { | |
285 | PERROR (new_name); | |
286 | } | |
287 | ||
288 | if (write (new, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) | |
289 | { | |
290 | PERROR (new_name); | |
291 | } | |
292 | ||
7dd63af1 RS |
293 | if (write (new, &f_thdr, sizeof (f_thdr)) != sizeof (f_thdr)) |
294 | { | |
295 | PERROR (new_name); | |
296 | } | |
297 | ||
298 | if (write (new, &f_dhdr, sizeof (f_dhdr)) != sizeof (f_dhdr)) | |
299 | { | |
300 | PERROR (new_name); | |
301 | } | |
302 | ||
303 | if (write (new, &f_bhdr, sizeof (f_bhdr)) != sizeof (f_bhdr)) | |
304 | { | |
305 | PERROR (new_name); | |
306 | } | |
307 | ||
7dd63af1 RS |
308 | return (0); |
309 | ||
7dd63af1 RS |
310 | } |
311 | \f | |
5f2f0bc1 EZ |
312 | void |
313 | write_segment (int new, const char *ptr, const char *end) | |
730f4d72 EZ |
314 | { |
315 | register int i, nwrite, ret; | |
730f4d72 EZ |
316 | /* This is the normal amount to write at once. |
317 | It is the size of block that NFS uses. */ | |
318 | int writesize = 1 << 13; | |
319 | int pagesize = getpagesize (); | |
320 | char zeros[1 << 13]; | |
321 | ||
72af86bd | 322 | memset (zeros, 0, sizeof (zeros)); |
730f4d72 EZ |
323 | |
324 | for (i = 0; ptr < end;) | |
325 | { | |
326 | /* Distance to next multiple of writesize. */ | |
327 | nwrite = (((int) ptr + writesize) & -writesize) - (int) ptr; | |
328 | /* But not beyond specified end. */ | |
329 | if (nwrite > end - ptr) nwrite = end - ptr; | |
330 | ret = write (new, ptr, nwrite); | |
331 | /* If write gets a page fault, it means we reached | |
332 | a gap between the old text segment and the old data segment. | |
333 | This gap has probably been remapped into part of the text segment. | |
334 | So write zeros for it. */ | |
335 | if (ret == -1 | |
336 | #ifdef EFAULT | |
337 | && errno == EFAULT | |
338 | #endif | |
339 | ) | |
340 | { | |
341 | /* Write only a page of zeros at once, | |
2b34df4e | 342 | so that we don't overshoot the start |
730f4d72 EZ |
343 | of the valid memory in the old data segment. */ |
344 | if (nwrite > pagesize) | |
345 | nwrite = pagesize; | |
346 | write (new, zeros, nwrite); | |
347 | } | |
730f4d72 EZ |
348 | i += nwrite; |
349 | ptr += nwrite; | |
350 | } | |
351 | } | |
7dd63af1 RS |
352 | /* **************************************************************** |
353 | * copy_text_and_data | |
354 | * | |
355 | * Copy the text and data segments from memory to the new a.out | |
356 | */ | |
357 | static int | |
5f2f0bc1 | 358 | copy_text_and_data (int new, int a_out) |
7dd63af1 RS |
359 | { |
360 | register char *end; | |
361 | register char *ptr; | |
362 | ||
8eb2807f | 363 | #ifdef MSDOS |
8eb2807f RS |
364 | /* Dump the original table of exception handlers, not the one |
365 | where our exception hooks are registered. */ | |
366 | __djgpp_exception_toggle (); | |
c17a2102 KH |
367 | |
368 | /* Switch off startup flags that might have been set at runtime | |
369 | and which might change the way that dumped Emacs works. */ | |
370 | save_djgpp_startup_flags = _crt0_startup_flags; | |
371 | _crt0_startup_flags &= ~(_CRT0_FLAG_NO_LFN | _CRT0_FLAG_NEARPTR); | |
8eb2807f RS |
372 | #endif |
373 | ||
7dd63af1 RS |
374 | lseek (new, (long) text_scnptr, 0); |
375 | ptr = (char *) f_ohdr.text_start; | |
7dd63af1 RS |
376 | end = ptr + f_ohdr.tsize; |
377 | write_segment (new, ptr, end); | |
378 | ||
379 | lseek (new, (long) data_scnptr, 0); | |
380 | ptr = (char *) f_ohdr.data_start; | |
381 | end = ptr + f_ohdr.dsize; | |
382 | write_segment (new, ptr, end); | |
383 | ||
8eb2807f | 384 | #ifdef MSDOS |
8eb2807f RS |
385 | /* Restore our exception hooks. */ |
386 | __djgpp_exception_toggle (); | |
c17a2102 KH |
387 | |
388 | /* Restore the startup flags. */ | |
389 | _crt0_startup_flags = save_djgpp_startup_flags; | |
8eb2807f | 390 | #endif |
8eb2807f | 391 | |
7dd63af1 RS |
392 | |
393 | return 0; | |
394 | } | |
7dd63af1 RS |
395 | \f |
396 | /* **************************************************************** | |
397 | * copy_sym | |
398 | * | |
399 | * Copy the relocation information and symbol table from the a.out to the new | |
400 | */ | |
401 | static int | |
5f2f0bc1 | 402 | copy_sym (int new, int a_out, const char *a_name, const char *new_name) |
7dd63af1 RS |
403 | { |
404 | char page[1024]; | |
405 | int n; | |
406 | ||
407 | if (a_out < 0) | |
408 | return 0; | |
409 | ||
7dd63af1 RS |
410 | if (SYMS_START == 0L) |
411 | return 0; | |
7dd63af1 | 412 | |
7dd63af1 | 413 | if (lnnoptr) /* if there is line number info */ |
c8b14b5f | 414 | lseek (a_out, coff_offset + lnnoptr, 0); /* start copying from there */ |
7dd63af1 | 415 | else |
c8b14b5f | 416 | lseek (a_out, coff_offset + SYMS_START, 0); /* Position a.out to symtab. */ |
7dd63af1 RS |
417 | |
418 | while ((n = read (a_out, page, sizeof page)) > 0) | |
419 | { | |
420 | if (write (new, page, n) != n) | |
421 | { | |
422 | PERROR (new_name); | |
423 | } | |
424 | } | |
425 | if (n < 0) | |
426 | { | |
427 | PERROR (a_name); | |
428 | } | |
429 | return 0; | |
430 | } | |
431 | \f | |
432 | /* **************************************************************** | |
433 | * mark_x | |
434 | * | |
eb8c3be9 | 435 | * After successfully building the new a.out, mark it executable |
7dd63af1 RS |
436 | */ |
437 | static void | |
5f2f0bc1 | 438 | mark_x (const char *name) |
7dd63af1 RS |
439 | { |
440 | struct stat sbuf; | |
441 | int um; | |
442 | int new = 0; /* for PERROR */ | |
443 | ||
444 | um = umask (777); | |
445 | umask (um); | |
446 | if (stat (name, &sbuf) == -1) | |
447 | { | |
448 | PERROR (name); | |
449 | } | |
450 | sbuf.st_mode |= 0111 & ~um; | |
451 | if (chmod (name, sbuf.st_mode) == -1) | |
452 | PERROR (name); | |
453 | } | |
454 | \f | |
7dd63af1 RS |
455 | |
456 | /* | |
457 | * If the COFF file contains a symbol table and a line number section, | |
458 | * then any auxiliary entries that have values for x_lnnoptr must | |
459 | * be adjusted by the amount that the line number section has moved | |
460 | * in the file (bias computed in make_hdr). The #@$%&* designers of | |
461 | * the auxiliary entry structures used the absolute file offsets for | |
462 | * the line number entry rather than an offset from the start of the | |
463 | * line number section! | |
464 | * | |
465 | * When I figure out how to scan through the symbol table and pick out | |
466 | * the auxiliary entries that need adjustment, this routine will | |
467 | * be fixed. As it is now, all such entries are wrong and sdb | |
468 | * will complain. Fred Fish, UniSoft Systems Inc. | |
469 | */ | |
470 | ||
471 | /* This function is probably very slow. Instead of reopening the new | |
472 | file for input and output it should copy from the old to the new | |
473 | using the two descriptors already open (WRITEDESC and READDESC). | |
474 | Instead of reading one small structure at a time it should use | |
475 | a reasonable size buffer. But I don't have time to work on such | |
476 | things, so I am installing it as submitted to me. -- RMS. */ | |
477 | ||
5f2f0bc1 EZ |
478 | int |
479 | adjust_lnnoptrs (int writedesc, int readdesc, const char *new_name) | |
7dd63af1 RS |
480 | { |
481 | register int nsyms; | |
482 | register int new; | |
7dd63af1 RS |
483 | struct syment symentry; |
484 | union auxent auxentry; | |
7dd63af1 RS |
485 | |
486 | if (!lnnoptr || !f_hdr.f_symptr) | |
487 | return 0; | |
488 | ||
3680bdc6 RS |
489 | #ifdef MSDOS |
490 | if ((new = writedesc) < 0) | |
491 | #else | |
2d30a233 | 492 | if ((new = open (new_name, O_RDWR)) < 0) |
3680bdc6 | 493 | #endif |
7dd63af1 RS |
494 | { |
495 | PERROR (new_name); | |
496 | return -1; | |
497 | } | |
498 | ||
499 | lseek (new, f_hdr.f_symptr, 0); | |
500 | for (nsyms = 0; nsyms < f_hdr.f_nsyms; nsyms++) | |
501 | { | |
502 | read (new, &symentry, SYMESZ); | |
503 | if (symentry.n_numaux) | |
504 | { | |
505 | read (new, &auxentry, AUXESZ); | |
506 | nsyms++; | |
1ba3de00 RS |
507 | if (ISFCN (symentry.n_type) || symentry.n_type == 0x2400) |
508 | { | |
509 | auxentry.x_sym.x_fcnary.x_fcn.x_lnnoptr += bias; | |
510 | lseek (new, -AUXESZ, 1); | |
511 | write (new, &auxentry, AUXESZ); | |
512 | } | |
7dd63af1 RS |
513 | } |
514 | } | |
3680bdc6 | 515 | #ifndef MSDOS |
7dd63af1 | 516 | close (new); |
3680bdc6 RS |
517 | #endif |
518 | return 0; | |
7dd63af1 RS |
519 | } |
520 | ||
730f4d72 EZ |
521 | /* **************************************************************** |
522 | * unexec | |
523 | * | |
524 | * driving logic. | |
525 | */ | |
381259ef | 526 | void |
dd5ecd6b | 527 | unexec (const char *new_name, const char *a_name) |
730f4d72 | 528 | { |
5f2f0bc1 | 529 | int new = -1, a_out = -1; |
730f4d72 EZ |
530 | |
531 | if (a_name && (a_out = open (a_name, O_RDONLY)) < 0) | |
532 | { | |
533 | PERROR (a_name); | |
534 | } | |
535 | if ((new = creat (new_name, 0666)) < 0) | |
536 | { | |
537 | PERROR (new_name); | |
538 | } | |
539 | ||
dd5ecd6b | 540 | if (make_hdr (new, a_out, a_name, new_name) < 0 |
730f4d72 EZ |
541 | || copy_text_and_data (new, a_out) < 0 |
542 | || copy_sym (new, a_out, a_name, new_name) < 0 | |
730f4d72 | 543 | || adjust_lnnoptrs (new, a_out, new_name) < 0 |
730f4d72 EZ |
544 | ) |
545 | { | |
546 | close (new); | |
fffe2e14 | 547 | return; |
730f4d72 EZ |
548 | } |
549 | ||
550 | close (new); | |
551 | if (a_out >= 0) | |
552 | close (a_out); | |
553 | mark_x (new_name); | |
730f4d72 EZ |
554 | } |
555 | ||
7dd63af1 | 556 | #endif /* not CANNOT_DUMP */ |