Commit | Line | Data |
---|---|---|
0248680a | 1 | /* Dump an executable image. |
ab422c4d PE |
2 | Copyright (C) 1985-1988, 1999, 2001-2013 Free Software Foundation, |
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 PE |
44 | #include "unexec.h" |
45 | ||
4e3a36cd | 46 | #define PERROR(file) report_error (file, new) |
4e3a36cd JB |
47 | #include <a.out.h> |
48 | /* Define getpagesize () if the system does not. | |
49 | Note that this may depend on symbols defined in a.out.h | |
50 | */ | |
51 | #include "getpagesize.h" | |
76998edb | 52 | |
4e3a36cd | 53 | #include <sys/types.h> |
227be86d PE |
54 | #include <inttypes.h> |
55 | #include <stdarg.h> | |
4e3a36cd JB |
56 | #include <stdio.h> |
57 | #include <sys/stat.h> | |
58 | #include <errno.h> | |
0248680a DL |
59 | #include <unistd.h> |
60 | #include <fcntl.h> | |
4e3a36cd | 61 | |
f53f992a PE |
62 | extern char _data[]; |
63 | extern char _text[]; | |
0248680a | 64 | |
4e3a36cd JB |
65 | #include <filehdr.h> |
66 | #include <aouthdr.h> | |
67 | #include <scnhdr.h> | |
68 | #include <syms.h> | |
0248680a | 69 | |
4e3a36cd JB |
70 | static struct filehdr f_hdr; /* File header */ |
71 | static struct aouthdr f_ohdr; /* Optional file header (a.out) */ | |
f53f992a PE |
72 | static off_t bias; /* Bias to add for growth */ |
73 | static off_t lnnoptr; /* Pointer to line-number info within file */ | |
4e3a36cd | 74 | |
f53f992a PE |
75 | static off_t text_scnptr; |
76 | static off_t data_scnptr; | |
4a438fc5 | 77 | #define ALIGN(val, pwr) (((val) + ((1L<<(pwr))-1)) & ~((1L<<(pwr))-1)) |
f53f992a PE |
78 | static off_t load_scnptr; |
79 | static off_t orig_load_scnptr; | |
80 | static off_t orig_data_scnptr; | |
dc44c39a | 81 | static int unrelocate_symbols (int, int, const char *, const char *); |
4e3a36cd JB |
82 | |
83 | #ifndef MAX_SECTIONS | |
84 | #define MAX_SECTIONS 10 | |
85 | #endif | |
86 | ||
dc44c39a | 87 | static int adjust_lnnoptrs (int, int, const char *); |
4e3a36cd JB |
88 | |
89 | static int pagemask; | |
90 | ||
8eca17c9 | 91 | #include "lisp.h" |
4e3a36cd | 92 | |
227be86d | 93 | static _Noreturn void |
dc44c39a | 94 | report_error (const char *file, int fd) |
4e3a36cd JB |
95 | { |
96 | if (fd) | |
227be86d PE |
97 | { |
98 | int failed_errno = errno; | |
99 | close (fd); | |
100 | errno = failed_errno; | |
101 | } | |
8eca17c9 | 102 | report_file_error ("Cannot unexec", Fcons (build_string (file), Qnil)); |
4e3a36cd | 103 | } |
76998edb | 104 | |
227be86d PE |
105 | #define ERROR0(msg) report_error_1 (new, msg) |
106 | #define ERROR1(msg,x) report_error_1 (new, msg, x) | |
107 | #define ERROR2(msg,x,y) report_error_1 (new, msg, x, y) | |
76998edb | 108 | |
227be86d PE |
109 | static _Noreturn void ATTRIBUTE_FORMAT_PRINTF (2, 3) |
110 | report_error_1 (int fd, const char *msg, ...) | |
76998edb | 111 | { |
227be86d | 112 | va_list ap; |
4e3a36cd | 113 | close (fd); |
227be86d PE |
114 | va_start (ap, msg); |
115 | verror (msg, ap); | |
116 | va_end (ap); | |
4e3a36cd JB |
117 | } |
118 | ||
dc44c39a PE |
119 | static int make_hdr (int, int, const char *, const char *); |
120 | static void mark_x (const char *); | |
0248680a | 121 | static int copy_text_and_data (int); |
dc44c39a | 122 | static int copy_sym (int, int, const char *, const char *); |
0248680a | 123 | static void write_segment (int, char *, char *); |
4e3a36cd JB |
124 | \f |
125 | /* **************************************************************** | |
126 | * unexec | |
127 | * | |
128 | * driving logic. | |
129 | */ | |
381259ef PE |
130 | void |
131 | unexec (const char *new_name, const char *a_name) | |
76998edb | 132 | { |
0248680a | 133 | int new = -1, a_out = -1; |
4e3a36cd | 134 | |
0248680a | 135 | if (a_name && (a_out = open (a_name, O_RDONLY)) < 0) |
4e3a36cd JB |
136 | { |
137 | PERROR (a_name); | |
138 | } | |
139 | if ((new = creat (new_name, 0666)) < 0) | |
140 | { | |
141 | PERROR (new_name); | |
142 | } | |
0248680a | 143 | if (make_hdr (new, a_out, |
0248680a | 144 | a_name, new_name) < 0 |
4e3a36cd JB |
145 | || copy_text_and_data (new) < 0 |
146 | || copy_sym (new, a_out, a_name, new_name) < 0 | |
4e3a36cd | 147 | || adjust_lnnoptrs (new, a_out, new_name) < 0 |
0248680a | 148 | || unrelocate_symbols (new, a_out, a_name, new_name) < 0) |
76998edb | 149 | { |
4e3a36cd | 150 | close (new); |
fffe2e14 | 151 | return; |
76998edb | 152 | } |
76998edb | 153 | |
4e3a36cd JB |
154 | close (new); |
155 | if (a_out >= 0) | |
156 | close (a_out); | |
157 | mark_x (new_name); | |
4e3a36cd JB |
158 | } |
159 | ||
160 | /* **************************************************************** | |
161 | * make_hdr | |
162 | * | |
163 | * Make the header in the new a.out from the header in core. | |
164 | * Modify the text and data sizes. | |
165 | */ | |
166 | static int | |
0248680a | 167 | make_hdr (int new, int a_out, |
dc44c39a | 168 | const char *a_name, const char *new_name) |
4e3a36cd | 169 | { |
0248680a | 170 | int scns; |
227be86d PE |
171 | uintptr_t bss_start; |
172 | uintptr_t data_start; | |
4e3a36cd JB |
173 | |
174 | struct scnhdr section[MAX_SECTIONS]; | |
175 | struct scnhdr * f_thdr; /* Text section header */ | |
176 | struct scnhdr * f_dhdr; /* Data section header */ | |
177 | struct scnhdr * f_bhdr; /* Bss section header */ | |
178 | struct scnhdr * f_lhdr; /* Loader section header */ | |
179 | struct scnhdr * f_tchdr; /* Typechk section header */ | |
180 | struct scnhdr * f_dbhdr; /* Debug section header */ | |
181 | struct scnhdr * f_xhdr; /* Except section header */ | |
182 | ||
183 | load_scnptr = orig_load_scnptr = lnnoptr = 0; | |
184 | pagemask = getpagesize () - 1; | |
185 | ||
186 | /* Adjust text/data boundary. */ | |
f53f992a | 187 | data_start = (uintptr_t) _data; |
4e3a36cd | 188 | |
4e3a36cd | 189 | data_start = data_start & ~pagemask; /* (Down) to page boundary. */ |
4e3a36cd | 190 | |
227be86d | 191 | bss_start = (uintptr_t) sbrk (0) + pagemask; |
dd5ecd6b | 192 | bss_start &= ~ pagemask; |
76998edb | 193 | |
4e3a36cd JB |
194 | if (data_start > bss_start) /* Can't have negative data size. */ |
195 | { | |
227be86d PE |
196 | ERROR2 (("unexec: data_start (0x%"PRIxPTR |
197 | ") can't be greater than bss_start (0x%"PRIxPTR")"), | |
4e3a36cd JB |
198 | data_start, bss_start); |
199 | } | |
76998edb | 200 | |
4e3a36cd | 201 | /* Salvage as much info from the existing file as possible */ |
4e3a36cd JB |
202 | f_thdr = NULL; f_dhdr = NULL; f_bhdr = NULL; |
203 | f_lhdr = NULL; f_tchdr = NULL; f_dbhdr = NULL; f_xhdr = NULL; | |
204 | if (a_out >= 0) | |
76998edb | 205 | { |
4e3a36cd JB |
206 | if (read (a_out, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) |
207 | { | |
208 | PERROR (a_name); | |
209 | } | |
4e3a36cd JB |
210 | if (f_hdr.f_opthdr > 0) |
211 | { | |
212 | if (read (a_out, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) | |
213 | { | |
214 | PERROR (a_name); | |
215 | } | |
4e3a36cd JB |
216 | } |
217 | if (f_hdr.f_nscns > MAX_SECTIONS) | |
218 | { | |
219 | ERROR0 ("unexec: too many section headers -- increase MAX_SECTIONS"); | |
220 | } | |
221 | /* Loop through section headers */ | |
222 | for (scns = 0; scns < f_hdr.f_nscns; scns++) { | |
223 | struct scnhdr *s = §ion[scns]; | |
224 | if (read (a_out, s, sizeof (*s)) != sizeof (*s)) | |
225 | { | |
226 | PERROR (a_name); | |
227 | } | |
4e3a36cd JB |
228 | |
229 | #define CHECK_SCNHDR(ptr, name, flags) \ | |
5e617bc2 | 230 | if (strcmp (s->s_name, name) == 0) { \ |
4e3a36cd | 231 | if (s->s_flags != flags) { \ |
5e617bc2 JB |
232 | fprintf (stderr, "unexec: %lx flags where %x expected in %s section.\n", \ |
233 | (unsigned long)s->s_flags, flags, name); \ | |
4e3a36cd JB |
234 | } \ |
235 | if (ptr) { \ | |
5e617bc2 JB |
236 | fprintf (stderr, "unexec: duplicate section header for section %s.\n", \ |
237 | name); \ | |
4e3a36cd JB |
238 | } \ |
239 | ptr = s; \ | |
240 | } | |
5e617bc2 JB |
241 | CHECK_SCNHDR (f_thdr, _TEXT, STYP_TEXT); |
242 | CHECK_SCNHDR (f_dhdr, _DATA, STYP_DATA); | |
243 | CHECK_SCNHDR (f_bhdr, _BSS, STYP_BSS); | |
244 | CHECK_SCNHDR (f_lhdr, _LOADER, STYP_LOADER); | |
245 | CHECK_SCNHDR (f_dbhdr, _DEBUG, STYP_DEBUG); | |
246 | CHECK_SCNHDR (f_tchdr, _TYPCHK, STYP_TYPCHK); | |
247 | CHECK_SCNHDR (f_xhdr, _EXCEPT, STYP_EXCEPT); | |
4e3a36cd JB |
248 | } |
249 | ||
250 | if (f_thdr == 0) | |
251 | { | |
0248680a | 252 | ERROR1 ("unexec: couldn't find \"%s\" section", (int) _TEXT); |
4e3a36cd JB |
253 | } |
254 | if (f_dhdr == 0) | |
255 | { | |
0248680a | 256 | ERROR1 ("unexec: couldn't find \"%s\" section", (int) _DATA); |
4e3a36cd JB |
257 | } |
258 | if (f_bhdr == 0) | |
259 | { | |
0248680a | 260 | ERROR1 ("unexec: couldn't find \"%s\" section", (int) _BSS); |
4e3a36cd | 261 | } |
76998edb | 262 | } |
4e3a36cd | 263 | else |
76998edb | 264 | { |
4e3a36cd | 265 | ERROR0 ("can't build a COFF file from scratch yet"); |
76998edb | 266 | } |
4e3a36cd JB |
267 | orig_data_scnptr = f_dhdr->s_scnptr; |
268 | orig_load_scnptr = f_lhdr ? f_lhdr->s_scnptr : 0; | |
269 | ||
270 | /* Now we alter the contents of all the f_*hdr variables | |
271 | to correspond to what we want to dump. */ | |
4a438fc5 RS |
272 | |
273 | /* Indicate that the reloc information is no longer valid for ld (bind); | |
274 | we only update it enough to fake out the exec-time loader. */ | |
275 | f_hdr.f_flags |= (F_RELFLG | F_EXEC); | |
276 | ||
0248680a | 277 | f_ohdr.dsize = bss_start - f_ohdr.data_start; |
dd5ecd6b | 278 | f_ohdr.bsize = 0; |
4e3a36cd JB |
279 | |
280 | f_dhdr->s_size = f_ohdr.dsize; | |
281 | f_bhdr->s_size = f_ohdr.bsize; | |
4a438fc5 RS |
282 | f_bhdr->s_paddr = f_ohdr.data_start + f_ohdr.dsize; |
283 | f_bhdr->s_vaddr = f_ohdr.data_start + f_ohdr.dsize; | |
4e3a36cd JB |
284 | |
285 | /* fix scnptr's */ | |
286 | { | |
f53f992a | 287 | off_t ptr = section[0].s_scnptr; |
4e3a36cd | 288 | |
4a438fc5 RS |
289 | bias = -1; |
290 | for (scns = 0; scns < f_hdr.f_nscns; scns++) | |
291 | { | |
292 | struct scnhdr *s = §ion[scns]; | |
4e3a36cd | 293 | |
4a438fc5 RS |
294 | if (s->s_flags & STYP_PAD) /* .pad sections omitted in AIX 4.1 */ |
295 | { | |
296 | /* | |
297 | * the text_start should probably be o_algntext but that doesn't | |
298 | * seem to change | |
299 | */ | |
300 | if (f_ohdr.text_start != 0) /* && scns != 0 */ | |
301 | { | |
302 | s->s_size = 512 - (ptr % 512); | |
303 | if (s->s_size == 512) | |
304 | s->s_size = 0; | |
305 | } | |
306 | s->s_scnptr = ptr; | |
307 | } | |
308 | else if (s->s_flags & STYP_DATA) | |
4e3a36cd | 309 | s->s_scnptr = ptr; |
4a438fc5 RS |
310 | else if (!(s->s_flags & (STYP_TEXT | STYP_BSS))) |
311 | { | |
312 | if (bias == -1) /* if first section after bss */ | |
313 | bias = ptr - s->s_scnptr; | |
4e3a36cd | 314 | |
4a438fc5 RS |
315 | s->s_scnptr += bias; |
316 | ptr = s->s_scnptr; | |
317 | } | |
177c0ea7 | 318 | |
4a438fc5 RS |
319 | ptr = ptr + s->s_size; |
320 | } | |
4e3a36cd JB |
321 | } |
322 | ||
323 | /* fix other pointers */ | |
4a438fc5 RS |
324 | for (scns = 0; scns < f_hdr.f_nscns; scns++) |
325 | { | |
326 | struct scnhdr *s = §ion[scns]; | |
4e3a36cd | 327 | |
4a438fc5 RS |
328 | if (s->s_relptr != 0) |
329 | { | |
330 | s->s_relptr += bias; | |
331 | } | |
332 | if (s->s_lnnoptr != 0) | |
333 | { | |
334 | if (lnnoptr == 0) lnnoptr = s->s_lnnoptr; | |
335 | s->s_lnnoptr += bias; | |
336 | } | |
337 | } | |
4e3a36cd JB |
338 | |
339 | if (f_hdr.f_symptr > 0L) | |
76998edb | 340 | { |
4e3a36cd | 341 | f_hdr.f_symptr += bias; |
76998edb JB |
342 | } |
343 | ||
4e3a36cd JB |
344 | text_scnptr = f_thdr->s_scnptr; |
345 | data_scnptr = f_dhdr->s_scnptr; | |
346 | load_scnptr = f_lhdr ? f_lhdr->s_scnptr : 0; | |
76998edb | 347 | |
4e3a36cd JB |
348 | if (write (new, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) |
349 | { | |
350 | PERROR (new_name); | |
351 | } | |
76998edb | 352 | |
4e3a36cd JB |
353 | if (f_hdr.f_opthdr > 0) |
354 | { | |
355 | if (write (new, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) | |
76998edb | 356 | { |
4e3a36cd JB |
357 | PERROR (new_name); |
358 | } | |
359 | } | |
76998edb | 360 | |
4e3a36cd JB |
361 | for (scns = 0; scns < f_hdr.f_nscns; scns++) { |
362 | struct scnhdr *s = §ion[scns]; | |
363 | if (write (new, s, sizeof (*s)) != sizeof (*s)) | |
364 | { | |
365 | PERROR (new_name); | |
366 | } | |
367 | } | |
76998edb | 368 | |
4e3a36cd | 369 | return (0); |
4e3a36cd JB |
370 | } |
371 | \f | |
372 | /* **************************************************************** | |
177c0ea7 | 373 | |
4e3a36cd JB |
374 | * |
375 | * Copy the text and data segments from memory to the new a.out | |
376 | */ | |
377 | static int | |
0248680a | 378 | copy_text_and_data (int new) |
4e3a36cd | 379 | { |
0248680a DL |
380 | char *end; |
381 | char *ptr; | |
4e3a36cd | 382 | |
f53f992a PE |
383 | lseek (new, text_scnptr, SEEK_SET); |
384 | ptr = _text + text_scnptr; | |
4e3a36cd JB |
385 | end = ptr + f_ohdr.tsize; |
386 | write_segment (new, ptr, end); | |
387 | ||
f53f992a | 388 | lseek (new, data_scnptr, SEEK_SET); |
0248680a | 389 | ptr = (char *) f_ohdr.data_start; |
4e3a36cd JB |
390 | end = ptr + f_ohdr.dsize; |
391 | write_segment (new, ptr, end); | |
392 | ||
393 | return 0; | |
394 | } | |
395 | ||
91b97ddb | 396 | #define UnexBlockSz (1<<12) /* read/write block size */ |
0248680a DL |
397 | static void |
398 | write_segment (int new, char *ptr, char *end) | |
4e3a36cd | 399 | { |
0248680a | 400 | int i, nwrite, ret; |
91b97ddb | 401 | char zeros[UnexBlockSz]; |
4e3a36cd JB |
402 | |
403 | for (i = 0; ptr < end;) | |
404 | { | |
91b97ddb RS |
405 | /* distance to next block. */ |
406 | nwrite = (((int) ptr + UnexBlockSz) & -UnexBlockSz) - (int) ptr; | |
4e3a36cd JB |
407 | /* But not beyond specified end. */ |
408 | if (nwrite > end - ptr) nwrite = end - ptr; | |
409 | ret = write (new, ptr, nwrite); | |
410 | /* If write gets a page fault, it means we reached | |
411 | a gap between the old text segment and the old data segment. | |
412 | This gap has probably been remapped into part of the text segment. | |
413 | So write zeros for it. */ | |
414 | if (ret == -1 && errno == EFAULT) | |
76998edb | 415 | { |
0248680a | 416 | memset (zeros, 0, nwrite); |
91b97ddb | 417 | write (new, zeros, nwrite); |
76998edb | 418 | } |
4e3a36cd | 419 | else if (nwrite != ret) |
76998edb | 420 | { |
227be86d PE |
421 | int write_errno = errno; |
422 | char buf[1000]; | |
423 | void *addr = ptr; | |
4e3a36cd | 424 | sprintf (buf, |
227be86d PE |
425 | "unexec write failure: addr %p, fileno %d, size 0x%x, wrote 0x%x, errno %d", |
426 | addr, new, nwrite, ret, errno); | |
427 | errno = write_errno; | |
4e3a36cd | 428 | PERROR (buf); |
76998edb | 429 | } |
4e3a36cd JB |
430 | i += nwrite; |
431 | ptr += nwrite; | |
432 | } | |
433 | } | |
434 | \f | |
435 | /* **************************************************************** | |
436 | * copy_sym | |
437 | * | |
438 | * Copy the relocation information and symbol table from the a.out to the new | |
439 | */ | |
440 | static int | |
dc44c39a | 441 | copy_sym (int new, int a_out, const char *a_name, const char *new_name) |
4e3a36cd | 442 | { |
91b97ddb | 443 | char page[UnexBlockSz]; |
4e3a36cd | 444 | int n; |
76998edb | 445 | |
4e3a36cd JB |
446 | if (a_out < 0) |
447 | return 0; | |
76998edb | 448 | |
4a438fc5 | 449 | if (orig_load_scnptr == 0L) |
4e3a36cd | 450 | return 0; |
76998edb | 451 | |
4a438fc5 | 452 | if (lnnoptr && lnnoptr < orig_load_scnptr) /* if there is line number info */ |
0248680a | 453 | lseek (a_out, lnnoptr, SEEK_SET); /* start copying from there */ |
4e3a36cd | 454 | else |
0248680a | 455 | lseek (a_out, orig_load_scnptr, SEEK_SET); /* Position a.out to symtab. */ |
4e3a36cd JB |
456 | |
457 | while ((n = read (a_out, page, sizeof page)) > 0) | |
458 | { | |
459 | if (write (new, page, n) != n) | |
76998edb | 460 | { |
4e3a36cd | 461 | PERROR (new_name); |
76998edb JB |
462 | } |
463 | } | |
4e3a36cd JB |
464 | if (n < 0) |
465 | { | |
466 | PERROR (a_name); | |
467 | } | |
468 | return 0; | |
469 | } | |
470 | \f | |
471 | /* **************************************************************** | |
472 | * mark_x | |
473 | * | |
eb8c3be9 | 474 | * After successfully building the new a.out, mark it executable |
4e3a36cd JB |
475 | */ |
476 | static void | |
dc44c39a | 477 | mark_x (const char *name) |
4e3a36cd JB |
478 | { |
479 | struct stat sbuf; | |
480 | int um; | |
481 | int new = 0; /* for PERROR */ | |
76998edb | 482 | |
4e3a36cd JB |
483 | um = umask (777); |
484 | umask (um); | |
485 | if (stat (name, &sbuf) == -1) | |
486 | { | |
487 | PERROR (name); | |
488 | } | |
489 | sbuf.st_mode |= 0111 & ~um; | |
490 | if (chmod (name, sbuf.st_mode) == -1) | |
491 | PERROR (name); | |
492 | } | |
493 | \f | |
0248680a | 494 | static int |
dc44c39a | 495 | adjust_lnnoptrs (int writedesc, int readdesc, const char *new_name) |
4e3a36cd | 496 | { |
0248680a DL |
497 | int nsyms; |
498 | int naux; | |
499 | int new; | |
4e3a36cd JB |
500 | struct syment symentry; |
501 | union auxent auxentry; | |
4e3a36cd JB |
502 | |
503 | if (!lnnoptr || !f_hdr.f_symptr) | |
504 | return 0; | |
505 | ||
0248680a | 506 | if ((new = open (new_name, O_RDWR)) < 0) |
4e3a36cd JB |
507 | { |
508 | PERROR (new_name); | |
509 | return -1; | |
510 | } | |
511 | ||
0248680a | 512 | lseek (new, f_hdr.f_symptr, SEEK_SET); |
4e3a36cd JB |
513 | for (nsyms = 0; nsyms < f_hdr.f_nsyms; nsyms++) |
514 | { | |
515 | read (new, &symentry, SYMESZ); | |
91b97ddb RS |
516 | if (symentry.n_sclass == C_BINCL || symentry.n_sclass == C_EINCL) |
517 | { | |
518 | symentry.n_value += bias; | |
0248680a | 519 | lseek (new, -SYMESZ, SEEK_CUR); |
91b97ddb RS |
520 | write (new, &symentry, SYMESZ); |
521 | } | |
522 | ||
4a438fc5 | 523 | for (naux = symentry.n_numaux; naux-- != 0; ) |
4e3a36cd JB |
524 | { |
525 | read (new, &auxentry, AUXESZ); | |
526 | nsyms++; | |
4a438fc5 RS |
527 | if (naux != 0 /* skip csect auxentry (last entry) */ |
528 | && (symentry.n_sclass == C_EXT || symentry.n_sclass == C_HIDEXT)) | |
529 | { | |
530 | auxentry.x_sym.x_fcnary.x_fcn.x_lnnoptr += bias; | |
0248680a | 531 | lseek (new, -AUXESZ, SEEK_CUR); |
4a438fc5 RS |
532 | write (new, &auxentry, AUXESZ); |
533 | } | |
4e3a36cd JB |
534 | } |
535 | } | |
536 | close (new); | |
76998edb | 537 | |
0248680a DL |
538 | return 0; |
539 | } | |
4e3a36cd | 540 | |
0248680a | 541 | static int |
dc44c39a PE |
542 | unrelocate_symbols (int new, int a_out, |
543 | const char *a_name, const char *new_name) | |
76998edb | 544 | { |
0248680a | 545 | int i; |
4e3a36cd | 546 | LDHDR ldhdr; |
0248680a | 547 | LDREL ldrel; |
f53f992a | 548 | off_t t_reloc = (intptr_t) _text - f_ohdr.text_start; |
0248680a | 549 | #ifndef ALIGN_DATA_RELOC |
f53f992a | 550 | off_t d_reloc = (intptr_t) _data - f_ohdr.data_start; |
0248680a | 551 | #else |
177c0ea7 | 552 | /* This worked (and was needed) before AIX 4.2. |
0248680a | 553 | I have no idea why. -- Mike */ |
f53f992a | 554 | off_t d_reloc = (intptr_t) _data - ALIGN (f_ohdr.data_start, 2); |
0248680a | 555 | #endif |
4e3a36cd | 556 | int * p; |
4e3a36cd JB |
557 | |
558 | if (load_scnptr == 0) | |
559 | return 0; | |
560 | ||
0248680a | 561 | lseek (a_out, orig_load_scnptr, SEEK_SET); |
4e3a36cd JB |
562 | if (read (a_out, &ldhdr, sizeof (ldhdr)) != sizeof (ldhdr)) |
563 | { | |
564 | PERROR (new_name); | |
565 | } | |
566 | ||
567 | #define SYMNDX_TEXT 0 | |
568 | #define SYMNDX_DATA 1 | |
569 | #define SYMNDX_BSS 2 | |
4e3a36cd | 570 | |
0248680a DL |
571 | for (i = 0; i < ldhdr.l_nreloc; i++) |
572 | { | |
573 | lseek (a_out, | |
574 | orig_load_scnptr + LDHDRSZ + LDSYMSZ*ldhdr.l_nsyms + LDRELSZ*i, | |
575 | SEEK_SET); | |
4e3a36cd | 576 | |
0248680a DL |
577 | if (read (a_out, &ldrel, LDRELSZ) != LDRELSZ) |
578 | { | |
579 | PERROR (a_name); | |
580 | } | |
4e3a36cd JB |
581 | |
582 | /* move the BSS loader symbols to the DATA segment */ | |
0248680a | 583 | if (ldrel.l_symndx == SYMNDX_BSS) |
4e3a36cd | 584 | { |
0248680a | 585 | ldrel.l_symndx = SYMNDX_DATA; |
91b97ddb | 586 | |
4e3a36cd JB |
587 | lseek (new, |
588 | load_scnptr + LDHDRSZ + LDSYMSZ*ldhdr.l_nsyms + LDRELSZ*i, | |
0248680a | 589 | SEEK_SET); |
4e3a36cd | 590 | |
0248680a | 591 | if (write (new, &ldrel, LDRELSZ) != LDRELSZ) |
4e3a36cd JB |
592 | { |
593 | PERROR (new_name); | |
594 | } | |
595 | } | |
596 | ||
0248680a | 597 | if (ldrel.l_rsecnm == f_ohdr.o_sndata) |
4e3a36cd JB |
598 | { |
599 | int orig_int; | |
600 | ||
4a438fc5 | 601 | lseek (a_out, |
0248680a DL |
602 | orig_data_scnptr + (ldrel.l_vaddr - f_ohdr.data_start), |
603 | SEEK_SET); | |
4e3a36cd | 604 | |
0248680a DL |
605 | if (read (a_out, (void *) &orig_int, sizeof (orig_int)) |
606 | != sizeof (orig_int)) | |
4e3a36cd JB |
607 | { |
608 | PERROR (a_name); | |
609 | } | |
610 | ||
0248680a | 611 | p = (int *) (ldrel.l_vaddr + d_reloc); |
4a438fc5 | 612 | |
0248680a | 613 | switch (ldrel.l_symndx) { |
4e3a36cd | 614 | case SYMNDX_TEXT: |
4a438fc5 | 615 | orig_int = * p - t_reloc; |
4e3a36cd JB |
616 | break; |
617 | ||
618 | case SYMNDX_DATA: | |
619 | case SYMNDX_BSS: | |
4a438fc5 | 620 | orig_int = * p - d_reloc; |
4e3a36cd JB |
621 | break; |
622 | } | |
623 | ||
4a438fc5 RS |
624 | if (orig_int != * p) |
625 | { | |
626 | lseek (new, | |
0248680a DL |
627 | data_scnptr + (ldrel.l_vaddr - f_ohdr.data_start), |
628 | SEEK_SET); | |
4a438fc5 RS |
629 | if (write (new, (void *) &orig_int, sizeof (orig_int)) |
630 | != sizeof (orig_int)) | |
631 | { | |
632 | PERROR (new_name); | |
633 | } | |
634 | } | |
4e3a36cd JB |
635 | } |
636 | } | |
0248680a | 637 | return 0; |
76998edb | 638 | } |