Commit | Line | Data |
---|---|---|
0248680a | 1 | /* Dump an executable image. |
ba318903 | 2 | Copyright (C) 1985-1988, 1999, 2001-2014 Free Software Foundation, |
ab422c4d | 3 | Inc. |
4e3a36cd | 4 | |
3b7ad313 EN |
5 | This file is part of GNU Emacs. |
6 | ||
9ec0b715 | 7 | GNU Emacs is free software: you can redistribute it and/or modify |
3b7ad313 | 8 | it under the terms of the GNU General Public License as published by |
9ec0b715 GM |
9 | the Free Software Foundation, either version 3 of the License, or |
10 | (at your option) any later version. | |
3b7ad313 EN |
11 | |
12 | GNU Emacs is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
9ec0b715 | 18 | along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */ |
4e3a36cd | 19 | |
9ec0b715 | 20 | /* |
4e3a36cd JB |
21 | In other words, you are welcome to use, share and improve this program. |
22 | You are forbidden to forbid anyone else to use, share and improve | |
23 | what you give them. Help stamp out software-hoarding! */ | |
24 | ||
25 | ||
0248680a | 26 | /* Originally based on the COFF unexec.c by Spencer W. Thomas. |
4e3a36cd | 27 | * |
0248680a DL |
28 | * Subsequently hacked on by |
29 | * Bill Mann <Bill_Man@praxisint.com> | |
30 | * Andrew Vignaux <Andrew.Vignaux@comp.vuw.ac.nz> | |
31 | * Mike Sperber <sperber@informatik.uni-tuebingen.de> | |
4a438fc5 | 32 | * |
4e3a36cd | 33 | * Synopsis: |
dd5ecd6b | 34 | * unexec (const char *new_name, const *old_name); |
4e3a36cd JB |
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 | * | |
4e3a36cd JB |
41 | */ |
42 | ||
18160b98 | 43 | #include <config.h> |
ce701a33 | 44 | #include "unexec.h" |
406af475 | 45 | #include "lisp.h" |
ce701a33 | 46 | |
4e3a36cd | 47 | #define PERROR(file) report_error (file, new) |
4e3a36cd JB |
48 | #include <a.out.h> |
49 | /* Define getpagesize () if the system does not. | |
50 | Note that this may depend on symbols defined in a.out.h | |
51 | */ | |
52 | #include "getpagesize.h" | |
76998edb | 53 | |
4e3a36cd | 54 | #include <sys/types.h> |
227be86d PE |
55 | #include <inttypes.h> |
56 | #include <stdarg.h> | |
4e3a36cd JB |
57 | #include <stdio.h> |
58 | #include <sys/stat.h> | |
59 | #include <errno.h> | |
0248680a DL |
60 | #include <unistd.h> |
61 | #include <fcntl.h> | |
4e3a36cd | 62 | |
f53f992a PE |
63 | extern char _data[]; |
64 | extern char _text[]; | |
0248680a | 65 | |
4e3a36cd JB |
66 | #include <filehdr.h> |
67 | #include <aouthdr.h> | |
68 | #include <scnhdr.h> | |
69 | #include <syms.h> | |
0248680a | 70 | |
4e3a36cd JB |
71 | static struct filehdr f_hdr; /* File header */ |
72 | static struct aouthdr f_ohdr; /* Optional file header (a.out) */ | |
f53f992a PE |
73 | static off_t bias; /* Bias to add for growth */ |
74 | static off_t lnnoptr; /* Pointer to line-number info within file */ | |
4e3a36cd | 75 | |
f53f992a PE |
76 | static off_t text_scnptr; |
77 | static off_t data_scnptr; | |
4a438fc5 | 78 | #define ALIGN(val, pwr) (((val) + ((1L<<(pwr))-1)) & ~((1L<<(pwr))-1)) |
f53f992a PE |
79 | static off_t load_scnptr; |
80 | static off_t orig_load_scnptr; | |
81 | static off_t orig_data_scnptr; | |
dc44c39a | 82 | static int unrelocate_symbols (int, int, const char *, const char *); |
4e3a36cd JB |
83 | |
84 | #ifndef MAX_SECTIONS | |
85 | #define MAX_SECTIONS 10 | |
86 | #endif | |
87 | ||
dc44c39a | 88 | static int adjust_lnnoptrs (int, int, const char *); |
4e3a36cd JB |
89 | |
90 | static int pagemask; | |
91 | ||
8eca17c9 | 92 | #include "lisp.h" |
4e3a36cd | 93 | |
227be86d | 94 | static _Noreturn void |
dc44c39a | 95 | report_error (const char *file, int fd) |
4e3a36cd | 96 | { |
a773ed9a | 97 | int err = errno; |
4e3a36cd | 98 | if (fd) |
a773ed9a | 99 | emacs_close (fd); |
a9757f6a | 100 | report_file_errno ("Cannot unexec", build_string (file), err); |
4e3a36cd | 101 | } |
76998edb | 102 | |
227be86d PE |
103 | #define ERROR0(msg) report_error_1 (new, msg) |
104 | #define ERROR1(msg,x) report_error_1 (new, msg, x) | |
105 | #define ERROR2(msg,x,y) report_error_1 (new, msg, x, y) | |
76998edb | 106 | |
227be86d PE |
107 | static _Noreturn void ATTRIBUTE_FORMAT_PRINTF (2, 3) |
108 | report_error_1 (int fd, const char *msg, ...) | |
76998edb | 109 | { |
227be86d | 110 | va_list ap; |
bacba3c2 | 111 | emacs_close (fd); |
227be86d PE |
112 | va_start (ap, msg); |
113 | verror (msg, ap); | |
114 | va_end (ap); | |
4e3a36cd JB |
115 | } |
116 | ||
dc44c39a PE |
117 | static int make_hdr (int, int, const char *, const char *); |
118 | static void mark_x (const char *); | |
0248680a | 119 | static int copy_text_and_data (int); |
dc44c39a | 120 | static int copy_sym (int, int, const char *, const char *); |
0248680a | 121 | static void write_segment (int, char *, char *); |
4e3a36cd JB |
122 | \f |
123 | /* **************************************************************** | |
124 | * unexec | |
125 | * | |
126 | * driving logic. | |
127 | */ | |
381259ef PE |
128 | void |
129 | unexec (const char *new_name, const char *a_name) | |
76998edb | 130 | { |
0248680a | 131 | int new = -1, a_out = -1; |
4e3a36cd | 132 | |
406af475 | 133 | if (a_name && (a_out = emacs_open (a_name, O_RDONLY, 0)) < 0) |
4e3a36cd JB |
134 | { |
135 | PERROR (a_name); | |
136 | } | |
406af475 | 137 | if ((new = emacs_open (new_name, O_WRONLY | O_CREAT | O_TRUNC, 0666)) < 0) |
4e3a36cd JB |
138 | { |
139 | PERROR (new_name); | |
140 | } | |
0248680a | 141 | if (make_hdr (new, a_out, |
0248680a | 142 | a_name, new_name) < 0 |
4e3a36cd JB |
143 | || copy_text_and_data (new) < 0 |
144 | || copy_sym (new, a_out, a_name, new_name) < 0 | |
4e3a36cd | 145 | || adjust_lnnoptrs (new, a_out, new_name) < 0 |
0248680a | 146 | || unrelocate_symbols (new, a_out, a_name, new_name) < 0) |
76998edb | 147 | { |
bacba3c2 | 148 | emacs_close (new); |
fffe2e14 | 149 | return; |
76998edb | 150 | } |
76998edb | 151 | |
bacba3c2 | 152 | emacs_close (new); |
4e3a36cd | 153 | if (a_out >= 0) |
bacba3c2 | 154 | emacs_close (a_out); |
4e3a36cd | 155 | mark_x (new_name); |
4e3a36cd JB |
156 | } |
157 | ||
158 | /* **************************************************************** | |
159 | * make_hdr | |
160 | * | |
161 | * Make the header in the new a.out from the header in core. | |
162 | * Modify the text and data sizes. | |
163 | */ | |
164 | static int | |
0248680a | 165 | make_hdr (int new, int a_out, |
dc44c39a | 166 | const char *a_name, const char *new_name) |
4e3a36cd | 167 | { |
0248680a | 168 | int scns; |
227be86d PE |
169 | uintptr_t bss_start; |
170 | uintptr_t data_start; | |
4e3a36cd JB |
171 | |
172 | struct scnhdr section[MAX_SECTIONS]; | |
173 | struct scnhdr * f_thdr; /* Text section header */ | |
174 | struct scnhdr * f_dhdr; /* Data section header */ | |
175 | struct scnhdr * f_bhdr; /* Bss section header */ | |
176 | struct scnhdr * f_lhdr; /* Loader section header */ | |
177 | struct scnhdr * f_tchdr; /* Typechk section header */ | |
178 | struct scnhdr * f_dbhdr; /* Debug section header */ | |
179 | struct scnhdr * f_xhdr; /* Except section header */ | |
180 | ||
181 | load_scnptr = orig_load_scnptr = lnnoptr = 0; | |
182 | pagemask = getpagesize () - 1; | |
183 | ||
184 | /* Adjust text/data boundary. */ | |
f53f992a | 185 | data_start = (uintptr_t) _data; |
4e3a36cd | 186 | |
4e3a36cd | 187 | data_start = data_start & ~pagemask; /* (Down) to page boundary. */ |
4e3a36cd | 188 | |
227be86d | 189 | bss_start = (uintptr_t) sbrk (0) + pagemask; |
dd5ecd6b | 190 | bss_start &= ~ pagemask; |
76998edb | 191 | |
4e3a36cd JB |
192 | if (data_start > bss_start) /* Can't have negative data size. */ |
193 | { | |
227be86d PE |
194 | ERROR2 (("unexec: data_start (0x%"PRIxPTR |
195 | ") can't be greater than bss_start (0x%"PRIxPTR")"), | |
4e3a36cd JB |
196 | data_start, bss_start); |
197 | } | |
76998edb | 198 | |
4e3a36cd | 199 | /* Salvage as much info from the existing file as possible */ |
4e3a36cd JB |
200 | f_thdr = NULL; f_dhdr = NULL; f_bhdr = NULL; |
201 | f_lhdr = NULL; f_tchdr = NULL; f_dbhdr = NULL; f_xhdr = NULL; | |
202 | if (a_out >= 0) | |
76998edb | 203 | { |
4e3a36cd JB |
204 | if (read (a_out, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) |
205 | { | |
206 | PERROR (a_name); | |
207 | } | |
4e3a36cd JB |
208 | if (f_hdr.f_opthdr > 0) |
209 | { | |
210 | if (read (a_out, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) | |
211 | { | |
212 | PERROR (a_name); | |
213 | } | |
4e3a36cd JB |
214 | } |
215 | if (f_hdr.f_nscns > MAX_SECTIONS) | |
216 | { | |
217 | ERROR0 ("unexec: too many section headers -- increase MAX_SECTIONS"); | |
218 | } | |
219 | /* Loop through section headers */ | |
220 | for (scns = 0; scns < f_hdr.f_nscns; scns++) { | |
221 | struct scnhdr *s = §ion[scns]; | |
222 | if (read (a_out, s, sizeof (*s)) != sizeof (*s)) | |
223 | { | |
224 | PERROR (a_name); | |
225 | } | |
4e3a36cd JB |
226 | |
227 | #define CHECK_SCNHDR(ptr, name, flags) \ | |
5e617bc2 | 228 | if (strcmp (s->s_name, name) == 0) { \ |
4e3a36cd | 229 | if (s->s_flags != flags) { \ |
5e617bc2 JB |
230 | fprintf (stderr, "unexec: %lx flags where %x expected in %s section.\n", \ |
231 | (unsigned long)s->s_flags, flags, name); \ | |
4e3a36cd JB |
232 | } \ |
233 | if (ptr) { \ | |
5e617bc2 JB |
234 | fprintf (stderr, "unexec: duplicate section header for section %s.\n", \ |
235 | name); \ | |
4e3a36cd JB |
236 | } \ |
237 | ptr = s; \ | |
238 | } | |
5e617bc2 JB |
239 | CHECK_SCNHDR (f_thdr, _TEXT, STYP_TEXT); |
240 | CHECK_SCNHDR (f_dhdr, _DATA, STYP_DATA); | |
241 | CHECK_SCNHDR (f_bhdr, _BSS, STYP_BSS); | |
242 | CHECK_SCNHDR (f_lhdr, _LOADER, STYP_LOADER); | |
243 | CHECK_SCNHDR (f_dbhdr, _DEBUG, STYP_DEBUG); | |
244 | CHECK_SCNHDR (f_tchdr, _TYPCHK, STYP_TYPCHK); | |
245 | CHECK_SCNHDR (f_xhdr, _EXCEPT, STYP_EXCEPT); | |
4e3a36cd JB |
246 | } |
247 | ||
248 | if (f_thdr == 0) | |
249 | { | |
0248680a | 250 | ERROR1 ("unexec: couldn't find \"%s\" section", (int) _TEXT); |
4e3a36cd JB |
251 | } |
252 | if (f_dhdr == 0) | |
253 | { | |
0248680a | 254 | ERROR1 ("unexec: couldn't find \"%s\" section", (int) _DATA); |
4e3a36cd JB |
255 | } |
256 | if (f_bhdr == 0) | |
257 | { | |
0248680a | 258 | ERROR1 ("unexec: couldn't find \"%s\" section", (int) _BSS); |
4e3a36cd | 259 | } |
76998edb | 260 | } |
4e3a36cd | 261 | else |
76998edb | 262 | { |
4e3a36cd | 263 | ERROR0 ("can't build a COFF file from scratch yet"); |
76998edb | 264 | } |
4e3a36cd JB |
265 | orig_data_scnptr = f_dhdr->s_scnptr; |
266 | orig_load_scnptr = f_lhdr ? f_lhdr->s_scnptr : 0; | |
267 | ||
268 | /* Now we alter the contents of all the f_*hdr variables | |
269 | to correspond to what we want to dump. */ | |
4a438fc5 RS |
270 | |
271 | /* Indicate that the reloc information is no longer valid for ld (bind); | |
272 | we only update it enough to fake out the exec-time loader. */ | |
273 | f_hdr.f_flags |= (F_RELFLG | F_EXEC); | |
274 | ||
0248680a | 275 | f_ohdr.dsize = bss_start - f_ohdr.data_start; |
dd5ecd6b | 276 | f_ohdr.bsize = 0; |
4e3a36cd JB |
277 | |
278 | f_dhdr->s_size = f_ohdr.dsize; | |
279 | f_bhdr->s_size = f_ohdr.bsize; | |
4a438fc5 RS |
280 | f_bhdr->s_paddr = f_ohdr.data_start + f_ohdr.dsize; |
281 | f_bhdr->s_vaddr = f_ohdr.data_start + f_ohdr.dsize; | |
4e3a36cd JB |
282 | |
283 | /* fix scnptr's */ | |
284 | { | |
f53f992a | 285 | off_t ptr = section[0].s_scnptr; |
4e3a36cd | 286 | |
4a438fc5 RS |
287 | bias = -1; |
288 | for (scns = 0; scns < f_hdr.f_nscns; scns++) | |
289 | { | |
290 | struct scnhdr *s = §ion[scns]; | |
4e3a36cd | 291 | |
4a438fc5 RS |
292 | if (s->s_flags & STYP_PAD) /* .pad sections omitted in AIX 4.1 */ |
293 | { | |
294 | /* | |
295 | * the text_start should probably be o_algntext but that doesn't | |
296 | * seem to change | |
297 | */ | |
298 | if (f_ohdr.text_start != 0) /* && scns != 0 */ | |
299 | { | |
300 | s->s_size = 512 - (ptr % 512); | |
301 | if (s->s_size == 512) | |
302 | s->s_size = 0; | |
303 | } | |
304 | s->s_scnptr = ptr; | |
305 | } | |
306 | else if (s->s_flags & STYP_DATA) | |
4e3a36cd | 307 | s->s_scnptr = ptr; |
4a438fc5 RS |
308 | else if (!(s->s_flags & (STYP_TEXT | STYP_BSS))) |
309 | { | |
310 | if (bias == -1) /* if first section after bss */ | |
311 | bias = ptr - s->s_scnptr; | |
4e3a36cd | 312 | |
4a438fc5 RS |
313 | s->s_scnptr += bias; |
314 | ptr = s->s_scnptr; | |
315 | } | |
177c0ea7 | 316 | |
4a438fc5 RS |
317 | ptr = ptr + s->s_size; |
318 | } | |
4e3a36cd JB |
319 | } |
320 | ||
321 | /* fix other pointers */ | |
4a438fc5 RS |
322 | for (scns = 0; scns < f_hdr.f_nscns; scns++) |
323 | { | |
324 | struct scnhdr *s = §ion[scns]; | |
4e3a36cd | 325 | |
4a438fc5 RS |
326 | if (s->s_relptr != 0) |
327 | { | |
328 | s->s_relptr += bias; | |
329 | } | |
330 | if (s->s_lnnoptr != 0) | |
331 | { | |
332 | if (lnnoptr == 0) lnnoptr = s->s_lnnoptr; | |
333 | s->s_lnnoptr += bias; | |
334 | } | |
335 | } | |
4e3a36cd JB |
336 | |
337 | if (f_hdr.f_symptr > 0L) | |
76998edb | 338 | { |
4e3a36cd | 339 | f_hdr.f_symptr += bias; |
76998edb JB |
340 | } |
341 | ||
4e3a36cd JB |
342 | text_scnptr = f_thdr->s_scnptr; |
343 | data_scnptr = f_dhdr->s_scnptr; | |
344 | load_scnptr = f_lhdr ? f_lhdr->s_scnptr : 0; | |
76998edb | 345 | |
4e3a36cd JB |
346 | if (write (new, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) |
347 | { | |
348 | PERROR (new_name); | |
349 | } | |
76998edb | 350 | |
4e3a36cd JB |
351 | if (f_hdr.f_opthdr > 0) |
352 | { | |
353 | if (write (new, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) | |
76998edb | 354 | { |
4e3a36cd JB |
355 | PERROR (new_name); |
356 | } | |
357 | } | |
76998edb | 358 | |
4e3a36cd JB |
359 | for (scns = 0; scns < f_hdr.f_nscns; scns++) { |
360 | struct scnhdr *s = §ion[scns]; | |
361 | if (write (new, s, sizeof (*s)) != sizeof (*s)) | |
362 | { | |
363 | PERROR (new_name); | |
364 | } | |
365 | } | |
76998edb | 366 | |
4e3a36cd | 367 | return (0); |
4e3a36cd JB |
368 | } |
369 | \f | |
370 | /* **************************************************************** | |
177c0ea7 | 371 | |
4e3a36cd JB |
372 | * |
373 | * Copy the text and data segments from memory to the new a.out | |
374 | */ | |
375 | static int | |
0248680a | 376 | copy_text_and_data (int new) |
4e3a36cd | 377 | { |
0248680a DL |
378 | char *end; |
379 | char *ptr; | |
4e3a36cd | 380 | |
f53f992a | 381 | lseek (new, text_scnptr, SEEK_SET); |
4f4ec76f | 382 | ptr = _text; |
4e3a36cd JB |
383 | end = ptr + f_ohdr.tsize; |
384 | write_segment (new, ptr, end); | |
385 | ||
f53f992a | 386 | lseek (new, data_scnptr, SEEK_SET); |
0248680a | 387 | ptr = (char *) f_ohdr.data_start; |
4e3a36cd JB |
388 | end = ptr + f_ohdr.dsize; |
389 | write_segment (new, ptr, end); | |
390 | ||
391 | return 0; | |
392 | } | |
393 | ||
91b97ddb | 394 | #define UnexBlockSz (1<<12) /* read/write block size */ |
0248680a DL |
395 | static void |
396 | write_segment (int new, char *ptr, char *end) | |
4e3a36cd | 397 | { |
0248680a | 398 | int i, nwrite, ret; |
91b97ddb | 399 | char zeros[UnexBlockSz]; |
4e3a36cd JB |
400 | |
401 | for (i = 0; ptr < end;) | |
402 | { | |
91b97ddb RS |
403 | /* distance to next block. */ |
404 | nwrite = (((int) ptr + UnexBlockSz) & -UnexBlockSz) - (int) ptr; | |
4e3a36cd JB |
405 | /* But not beyond specified end. */ |
406 | if (nwrite > end - ptr) nwrite = end - ptr; | |
407 | ret = write (new, ptr, nwrite); | |
408 | /* If write gets a page fault, it means we reached | |
409 | a gap between the old text segment and the old data segment. | |
410 | This gap has probably been remapped into part of the text segment. | |
411 | So write zeros for it. */ | |
412 | if (ret == -1 && errno == EFAULT) | |
76998edb | 413 | { |
0248680a | 414 | memset (zeros, 0, nwrite); |
91b97ddb | 415 | write (new, zeros, nwrite); |
76998edb | 416 | } |
4e3a36cd | 417 | else if (nwrite != ret) |
76998edb | 418 | { |
227be86d PE |
419 | int write_errno = errno; |
420 | char buf[1000]; | |
421 | void *addr = ptr; | |
4e3a36cd | 422 | sprintf (buf, |
227be86d PE |
423 | "unexec write failure: addr %p, fileno %d, size 0x%x, wrote 0x%x, errno %d", |
424 | addr, new, nwrite, ret, errno); | |
425 | errno = write_errno; | |
4e3a36cd | 426 | PERROR (buf); |
76998edb | 427 | } |
4e3a36cd JB |
428 | i += nwrite; |
429 | ptr += nwrite; | |
430 | } | |
431 | } | |
432 | \f | |
433 | /* **************************************************************** | |
434 | * copy_sym | |
435 | * | |
436 | * Copy the relocation information and symbol table from the a.out to the new | |
437 | */ | |
438 | static int | |
dc44c39a | 439 | copy_sym (int new, int a_out, const char *a_name, const char *new_name) |
4e3a36cd | 440 | { |
91b97ddb | 441 | char page[UnexBlockSz]; |
4e3a36cd | 442 | int n; |
76998edb | 443 | |
4e3a36cd JB |
444 | if (a_out < 0) |
445 | return 0; | |
76998edb | 446 | |
4a438fc5 | 447 | if (orig_load_scnptr == 0L) |
4e3a36cd | 448 | return 0; |
76998edb | 449 | |
4a438fc5 | 450 | if (lnnoptr && lnnoptr < orig_load_scnptr) /* if there is line number info */ |
0248680a | 451 | lseek (a_out, lnnoptr, SEEK_SET); /* start copying from there */ |
4e3a36cd | 452 | else |
0248680a | 453 | lseek (a_out, orig_load_scnptr, SEEK_SET); /* Position a.out to symtab. */ |
4e3a36cd JB |
454 | |
455 | while ((n = read (a_out, page, sizeof page)) > 0) | |
456 | { | |
457 | if (write (new, page, n) != n) | |
76998edb | 458 | { |
4e3a36cd | 459 | PERROR (new_name); |
76998edb JB |
460 | } |
461 | } | |
4e3a36cd JB |
462 | if (n < 0) |
463 | { | |
464 | PERROR (a_name); | |
465 | } | |
466 | return 0; | |
467 | } | |
468 | \f | |
469 | /* **************************************************************** | |
470 | * mark_x | |
471 | * | |
eb8c3be9 | 472 | * After successfully building the new a.out, mark it executable |
4e3a36cd JB |
473 | */ |
474 | static void | |
dc44c39a | 475 | mark_x (const char *name) |
4e3a36cd JB |
476 | { |
477 | struct stat sbuf; | |
478 | int um; | |
479 | int new = 0; /* for PERROR */ | |
76998edb | 480 | |
4e3a36cd JB |
481 | um = umask (777); |
482 | umask (um); | |
483 | if (stat (name, &sbuf) == -1) | |
484 | { | |
485 | PERROR (name); | |
486 | } | |
487 | sbuf.st_mode |= 0111 & ~um; | |
488 | if (chmod (name, sbuf.st_mode) == -1) | |
489 | PERROR (name); | |
490 | } | |
491 | \f | |
0248680a | 492 | static int |
dc44c39a | 493 | adjust_lnnoptrs (int writedesc, int readdesc, const char *new_name) |
4e3a36cd | 494 | { |
0248680a DL |
495 | int nsyms; |
496 | int naux; | |
497 | int new; | |
4e3a36cd JB |
498 | struct syment symentry; |
499 | union auxent auxentry; | |
4e3a36cd JB |
500 | |
501 | if (!lnnoptr || !f_hdr.f_symptr) | |
502 | return 0; | |
503 | ||
406af475 | 504 | if ((new = emacs_open (new_name, O_RDWR, 0)) < 0) |
4e3a36cd JB |
505 | { |
506 | PERROR (new_name); | |
507 | return -1; | |
508 | } | |
509 | ||
0248680a | 510 | lseek (new, f_hdr.f_symptr, SEEK_SET); |
4e3a36cd JB |
511 | for (nsyms = 0; nsyms < f_hdr.f_nsyms; nsyms++) |
512 | { | |
513 | read (new, &symentry, SYMESZ); | |
91b97ddb RS |
514 | if (symentry.n_sclass == C_BINCL || symentry.n_sclass == C_EINCL) |
515 | { | |
516 | symentry.n_value += bias; | |
0248680a | 517 | lseek (new, -SYMESZ, SEEK_CUR); |
91b97ddb RS |
518 | write (new, &symentry, SYMESZ); |
519 | } | |
520 | ||
4a438fc5 | 521 | for (naux = symentry.n_numaux; naux-- != 0; ) |
4e3a36cd JB |
522 | { |
523 | read (new, &auxentry, AUXESZ); | |
524 | nsyms++; | |
4a438fc5 RS |
525 | if (naux != 0 /* skip csect auxentry (last entry) */ |
526 | && (symentry.n_sclass == C_EXT || symentry.n_sclass == C_HIDEXT)) | |
527 | { | |
528 | auxentry.x_sym.x_fcnary.x_fcn.x_lnnoptr += bias; | |
0248680a | 529 | lseek (new, -AUXESZ, SEEK_CUR); |
4a438fc5 RS |
530 | write (new, &auxentry, AUXESZ); |
531 | } | |
4e3a36cd JB |
532 | } |
533 | } | |
bacba3c2 | 534 | emacs_close (new); |
76998edb | 535 | |
0248680a DL |
536 | return 0; |
537 | } | |
4e3a36cd | 538 | |
0248680a | 539 | static int |
dc44c39a PE |
540 | unrelocate_symbols (int new, int a_out, |
541 | const char *a_name, const char *new_name) | |
76998edb | 542 | { |
0248680a | 543 | int i; |
4e3a36cd | 544 | LDHDR ldhdr; |
0248680a | 545 | LDREL ldrel; |
f53f992a | 546 | off_t t_reloc = (intptr_t) _text - f_ohdr.text_start; |
0248680a | 547 | #ifndef ALIGN_DATA_RELOC |
f53f992a | 548 | off_t d_reloc = (intptr_t) _data - f_ohdr.data_start; |
0248680a | 549 | #else |
177c0ea7 | 550 | /* This worked (and was needed) before AIX 4.2. |
0248680a | 551 | I have no idea why. -- Mike */ |
f53f992a | 552 | off_t d_reloc = (intptr_t) _data - ALIGN (f_ohdr.data_start, 2); |
0248680a | 553 | #endif |
4e3a36cd | 554 | int * p; |
4e3a36cd JB |
555 | |
556 | if (load_scnptr == 0) | |
557 | return 0; | |
558 | ||
0248680a | 559 | lseek (a_out, orig_load_scnptr, SEEK_SET); |
4e3a36cd JB |
560 | if (read (a_out, &ldhdr, sizeof (ldhdr)) != sizeof (ldhdr)) |
561 | { | |
562 | PERROR (new_name); | |
563 | } | |
564 | ||
565 | #define SYMNDX_TEXT 0 | |
566 | #define SYMNDX_DATA 1 | |
567 | #define SYMNDX_BSS 2 | |
4e3a36cd | 568 | |
0248680a DL |
569 | for (i = 0; i < ldhdr.l_nreloc; i++) |
570 | { | |
571 | lseek (a_out, | |
572 | orig_load_scnptr + LDHDRSZ + LDSYMSZ*ldhdr.l_nsyms + LDRELSZ*i, | |
573 | SEEK_SET); | |
4e3a36cd | 574 | |
0248680a DL |
575 | if (read (a_out, &ldrel, LDRELSZ) != LDRELSZ) |
576 | { | |
577 | PERROR (a_name); | |
578 | } | |
4e3a36cd JB |
579 | |
580 | /* move the BSS loader symbols to the DATA segment */ | |
0248680a | 581 | if (ldrel.l_symndx == SYMNDX_BSS) |
4e3a36cd | 582 | { |
0248680a | 583 | ldrel.l_symndx = SYMNDX_DATA; |
91b97ddb | 584 | |
4e3a36cd JB |
585 | lseek (new, |
586 | load_scnptr + LDHDRSZ + LDSYMSZ*ldhdr.l_nsyms + LDRELSZ*i, | |
0248680a | 587 | SEEK_SET); |
4e3a36cd | 588 | |
0248680a | 589 | if (write (new, &ldrel, LDRELSZ) != LDRELSZ) |
4e3a36cd JB |
590 | { |
591 | PERROR (new_name); | |
592 | } | |
593 | } | |
594 | ||
0248680a | 595 | if (ldrel.l_rsecnm == f_ohdr.o_sndata) |
4e3a36cd JB |
596 | { |
597 | int orig_int; | |
598 | ||
4a438fc5 | 599 | lseek (a_out, |
0248680a DL |
600 | orig_data_scnptr + (ldrel.l_vaddr - f_ohdr.data_start), |
601 | SEEK_SET); | |
4e3a36cd | 602 | |
0248680a DL |
603 | if (read (a_out, (void *) &orig_int, sizeof (orig_int)) |
604 | != sizeof (orig_int)) | |
4e3a36cd JB |
605 | { |
606 | PERROR (a_name); | |
607 | } | |
608 | ||
4f4ec76f | 609 | p = (int *) (intptr_t) (ldrel.l_vaddr + d_reloc); |
4a438fc5 | 610 | |
0248680a | 611 | switch (ldrel.l_symndx) { |
4e3a36cd | 612 | case SYMNDX_TEXT: |
4a438fc5 | 613 | orig_int = * p - t_reloc; |
4e3a36cd JB |
614 | break; |
615 | ||
616 | case SYMNDX_DATA: | |
617 | case SYMNDX_BSS: | |
4a438fc5 | 618 | orig_int = * p - d_reloc; |
4e3a36cd JB |
619 | break; |
620 | } | |
621 | ||
4a438fc5 RS |
622 | if (orig_int != * p) |
623 | { | |
624 | lseek (new, | |
0248680a DL |
625 | data_scnptr + (ldrel.l_vaddr - f_ohdr.data_start), |
626 | SEEK_SET); | |
4a438fc5 RS |
627 | if (write (new, (void *) &orig_int, sizeof (orig_int)) |
628 | != sizeof (orig_int)) | |
629 | { | |
630 | PERROR (new_name); | |
631 | } | |
632 | } | |
4e3a36cd JB |
633 | } |
634 | } | |
0248680a | 635 | return 0; |
76998edb | 636 | } |