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> |
4e3a36cd JB |
54 | #include <stdio.h> |
55 | #include <sys/stat.h> | |
56 | #include <errno.h> | |
0248680a DL |
57 | #include <unistd.h> |
58 | #include <fcntl.h> | |
4e3a36cd | 59 | |
22d7feb2 PE |
60 | #include "mem-limits.h" |
61 | ||
313d9eb2 | 62 | char *start_of_text (void); /* Start of text */ |
4e3a36cd JB |
63 | |
64 | extern int _data; | |
4e3a36cd | 65 | extern int _text; |
0248680a | 66 | |
4e3a36cd JB |
67 | #include <filehdr.h> |
68 | #include <aouthdr.h> | |
69 | #include <scnhdr.h> | |
70 | #include <syms.h> | |
0248680a | 71 | |
4e3a36cd JB |
72 | static struct filehdr f_hdr; /* File header */ |
73 | static struct aouthdr f_ohdr; /* Optional file header (a.out) */ | |
0248680a DL |
74 | static long bias; /* Bias to add for growth */ |
75 | static long lnnoptr; /* Pointer to line-number info within file */ | |
4e3a36cd JB |
76 | |
77 | static long text_scnptr; | |
78 | static long data_scnptr; | |
4a438fc5 | 79 | #define ALIGN(val, pwr) (((val) + ((1L<<(pwr))-1)) & ~((1L<<(pwr))-1)) |
4e3a36cd JB |
80 | static long load_scnptr; |
81 | static long orig_load_scnptr; | |
82 | static long orig_data_scnptr; | |
dc44c39a | 83 | static int unrelocate_symbols (int, int, const char *, const char *); |
4e3a36cd JB |
84 | |
85 | #ifndef MAX_SECTIONS | |
86 | #define MAX_SECTIONS 10 | |
87 | #endif | |
88 | ||
dc44c39a | 89 | static int adjust_lnnoptrs (int, int, const char *); |
4e3a36cd JB |
90 | |
91 | static int pagemask; | |
92 | ||
8eca17c9 | 93 | #include "lisp.h" |
4e3a36cd | 94 | |
0248680a | 95 | static void |
dc44c39a | 96 | report_error (const char *file, int fd) |
4e3a36cd JB |
97 | { |
98 | if (fd) | |
99 | close (fd); | |
8eca17c9 | 100 | report_file_error ("Cannot unexec", Fcons (build_string (file), Qnil)); |
4e3a36cd | 101 | } |
76998edb | 102 | |
4e3a36cd JB |
103 | #define ERROR0(msg) report_error_1 (new, msg, 0, 0); return -1 |
104 | #define ERROR1(msg,x) report_error_1 (new, msg, x, 0); return -1 | |
105 | #define ERROR2(msg,x,y) report_error_1 (new, msg, x, y); return -1 | |
76998edb | 106 | |
0248680a | 107 | static void |
dc44c39a | 108 | report_error_1 (int fd, const char *msg, int a1, int a2) |
76998edb | 109 | { |
4e3a36cd | 110 | close (fd); |
4e3a36cd | 111 | error (msg, a1, a2); |
4e3a36cd JB |
112 | } |
113 | ||
dc44c39a PE |
114 | static int make_hdr (int, int, const char *, const char *); |
115 | static void mark_x (const char *); | |
0248680a | 116 | static int copy_text_and_data (int); |
dc44c39a | 117 | static int copy_sym (int, int, const char *, const char *); |
0248680a | 118 | static void write_segment (int, char *, char *); |
4e3a36cd JB |
119 | \f |
120 | /* **************************************************************** | |
121 | * unexec | |
122 | * | |
123 | * driving logic. | |
124 | */ | |
381259ef PE |
125 | void |
126 | unexec (const char *new_name, const char *a_name) | |
76998edb | 127 | { |
0248680a | 128 | int new = -1, a_out = -1; |
4e3a36cd | 129 | |
0248680a | 130 | if (a_name && (a_out = open (a_name, O_RDONLY)) < 0) |
4e3a36cd JB |
131 | { |
132 | PERROR (a_name); | |
133 | } | |
134 | if ((new = creat (new_name, 0666)) < 0) | |
135 | { | |
136 | PERROR (new_name); | |
137 | } | |
0248680a | 138 | if (make_hdr (new, a_out, |
0248680a | 139 | a_name, new_name) < 0 |
4e3a36cd JB |
140 | || copy_text_and_data (new) < 0 |
141 | || copy_sym (new, a_out, a_name, new_name) < 0 | |
4e3a36cd | 142 | || adjust_lnnoptrs (new, a_out, new_name) < 0 |
0248680a | 143 | || unrelocate_symbols (new, a_out, a_name, new_name) < 0) |
76998edb | 144 | { |
4e3a36cd | 145 | close (new); |
fffe2e14 | 146 | return; |
76998edb | 147 | } |
76998edb | 148 | |
4e3a36cd JB |
149 | close (new); |
150 | if (a_out >= 0) | |
151 | close (a_out); | |
152 | mark_x (new_name); | |
4e3a36cd JB |
153 | } |
154 | ||
155 | /* **************************************************************** | |
156 | * make_hdr | |
157 | * | |
158 | * Make the header in the new a.out from the header in core. | |
159 | * Modify the text and data sizes. | |
160 | */ | |
161 | static int | |
0248680a | 162 | make_hdr (int new, int a_out, |
dc44c39a | 163 | const char *a_name, const char *new_name) |
4e3a36cd | 164 | { |
0248680a | 165 | int scns; |
dd5ecd6b DN |
166 | unsigned int bss_start; |
167 | unsigned int data_start; | |
4e3a36cd JB |
168 | |
169 | struct scnhdr section[MAX_SECTIONS]; | |
170 | struct scnhdr * f_thdr; /* Text section header */ | |
171 | struct scnhdr * f_dhdr; /* Data section header */ | |
172 | struct scnhdr * f_bhdr; /* Bss section header */ | |
173 | struct scnhdr * f_lhdr; /* Loader section header */ | |
174 | struct scnhdr * f_tchdr; /* Typechk section header */ | |
175 | struct scnhdr * f_dbhdr; /* Debug section header */ | |
176 | struct scnhdr * f_xhdr; /* Except section header */ | |
177 | ||
178 | load_scnptr = orig_load_scnptr = lnnoptr = 0; | |
179 | pagemask = getpagesize () - 1; | |
180 | ||
181 | /* Adjust text/data boundary. */ | |
4e3a36cd | 182 | data_start = (long) start_of_data (); |
4e3a36cd JB |
183 | data_start = ADDR_CORRECT (data_start); |
184 | ||
4e3a36cd | 185 | data_start = data_start & ~pagemask; /* (Down) to page boundary. */ |
4e3a36cd | 186 | |
dd5ecd6b DN |
187 | bss_start = ADDR_CORRECT (sbrk (0)) + pagemask; |
188 | bss_start &= ~ pagemask; | |
76998edb | 189 | |
4e3a36cd JB |
190 | if (data_start > bss_start) /* Can't have negative data size. */ |
191 | { | |
192 | ERROR2 ("unexec: data_start (%u) can't be greater than bss_start (%u)", | |
193 | data_start, bss_start); | |
194 | } | |
76998edb | 195 | |
4e3a36cd | 196 | /* Salvage as much info from the existing file as possible */ |
4e3a36cd JB |
197 | f_thdr = NULL; f_dhdr = NULL; f_bhdr = NULL; |
198 | f_lhdr = NULL; f_tchdr = NULL; f_dbhdr = NULL; f_xhdr = NULL; | |
199 | if (a_out >= 0) | |
76998edb | 200 | { |
4e3a36cd JB |
201 | if (read (a_out, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) |
202 | { | |
203 | PERROR (a_name); | |
204 | } | |
4e3a36cd JB |
205 | if (f_hdr.f_opthdr > 0) |
206 | { | |
207 | if (read (a_out, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) | |
208 | { | |
209 | PERROR (a_name); | |
210 | } | |
4e3a36cd JB |
211 | } |
212 | if (f_hdr.f_nscns > MAX_SECTIONS) | |
213 | { | |
214 | ERROR0 ("unexec: too many section headers -- increase MAX_SECTIONS"); | |
215 | } | |
216 | /* Loop through section headers */ | |
217 | for (scns = 0; scns < f_hdr.f_nscns; scns++) { | |
218 | struct scnhdr *s = §ion[scns]; | |
219 | if (read (a_out, s, sizeof (*s)) != sizeof (*s)) | |
220 | { | |
221 | PERROR (a_name); | |
222 | } | |
4e3a36cd JB |
223 | |
224 | #define CHECK_SCNHDR(ptr, name, flags) \ | |
5e617bc2 | 225 | if (strcmp (s->s_name, name) == 0) { \ |
4e3a36cd | 226 | if (s->s_flags != flags) { \ |
5e617bc2 JB |
227 | fprintf (stderr, "unexec: %lx flags where %x expected in %s section.\n", \ |
228 | (unsigned long)s->s_flags, flags, name); \ | |
4e3a36cd JB |
229 | } \ |
230 | if (ptr) { \ | |
5e617bc2 JB |
231 | fprintf (stderr, "unexec: duplicate section header for section %s.\n", \ |
232 | name); \ | |
4e3a36cd JB |
233 | } \ |
234 | ptr = s; \ | |
235 | } | |
5e617bc2 JB |
236 | CHECK_SCNHDR (f_thdr, _TEXT, STYP_TEXT); |
237 | CHECK_SCNHDR (f_dhdr, _DATA, STYP_DATA); | |
238 | CHECK_SCNHDR (f_bhdr, _BSS, STYP_BSS); | |
239 | CHECK_SCNHDR (f_lhdr, _LOADER, STYP_LOADER); | |
240 | CHECK_SCNHDR (f_dbhdr, _DEBUG, STYP_DEBUG); | |
241 | CHECK_SCNHDR (f_tchdr, _TYPCHK, STYP_TYPCHK); | |
242 | CHECK_SCNHDR (f_xhdr, _EXCEPT, STYP_EXCEPT); | |
4e3a36cd JB |
243 | } |
244 | ||
245 | if (f_thdr == 0) | |
246 | { | |
0248680a | 247 | ERROR1 ("unexec: couldn't find \"%s\" section", (int) _TEXT); |
4e3a36cd JB |
248 | } |
249 | if (f_dhdr == 0) | |
250 | { | |
0248680a | 251 | ERROR1 ("unexec: couldn't find \"%s\" section", (int) _DATA); |
4e3a36cd JB |
252 | } |
253 | if (f_bhdr == 0) | |
254 | { | |
0248680a | 255 | ERROR1 ("unexec: couldn't find \"%s\" section", (int) _BSS); |
4e3a36cd | 256 | } |
76998edb | 257 | } |
4e3a36cd | 258 | else |
76998edb | 259 | { |
4e3a36cd | 260 | ERROR0 ("can't build a COFF file from scratch yet"); |
76998edb | 261 | } |
4e3a36cd JB |
262 | orig_data_scnptr = f_dhdr->s_scnptr; |
263 | orig_load_scnptr = f_lhdr ? f_lhdr->s_scnptr : 0; | |
264 | ||
265 | /* Now we alter the contents of all the f_*hdr variables | |
266 | to correspond to what we want to dump. */ | |
4a438fc5 RS |
267 | |
268 | /* Indicate that the reloc information is no longer valid for ld (bind); | |
269 | we only update it enough to fake out the exec-time loader. */ | |
270 | f_hdr.f_flags |= (F_RELFLG | F_EXEC); | |
271 | ||
0248680a | 272 | f_ohdr.dsize = bss_start - f_ohdr.data_start; |
dd5ecd6b | 273 | f_ohdr.bsize = 0; |
4e3a36cd JB |
274 | |
275 | f_dhdr->s_size = f_ohdr.dsize; | |
276 | f_bhdr->s_size = f_ohdr.bsize; | |
4a438fc5 RS |
277 | f_bhdr->s_paddr = f_ohdr.data_start + f_ohdr.dsize; |
278 | f_bhdr->s_vaddr = f_ohdr.data_start + f_ohdr.dsize; | |
4e3a36cd JB |
279 | |
280 | /* fix scnptr's */ | |
281 | { | |
4a438fc5 | 282 | ulong ptr = section[0].s_scnptr; |
4e3a36cd | 283 | |
4a438fc5 RS |
284 | bias = -1; |
285 | for (scns = 0; scns < f_hdr.f_nscns; scns++) | |
286 | { | |
287 | struct scnhdr *s = §ion[scns]; | |
4e3a36cd | 288 | |
4a438fc5 RS |
289 | if (s->s_flags & STYP_PAD) /* .pad sections omitted in AIX 4.1 */ |
290 | { | |
291 | /* | |
292 | * the text_start should probably be o_algntext but that doesn't | |
293 | * seem to change | |
294 | */ | |
295 | if (f_ohdr.text_start != 0) /* && scns != 0 */ | |
296 | { | |
297 | s->s_size = 512 - (ptr % 512); | |
298 | if (s->s_size == 512) | |
299 | s->s_size = 0; | |
300 | } | |
301 | s->s_scnptr = ptr; | |
302 | } | |
303 | else if (s->s_flags & STYP_DATA) | |
4e3a36cd | 304 | s->s_scnptr = ptr; |
4a438fc5 RS |
305 | else if (!(s->s_flags & (STYP_TEXT | STYP_BSS))) |
306 | { | |
307 | if (bias == -1) /* if first section after bss */ | |
308 | bias = ptr - s->s_scnptr; | |
4e3a36cd | 309 | |
4a438fc5 RS |
310 | s->s_scnptr += bias; |
311 | ptr = s->s_scnptr; | |
312 | } | |
177c0ea7 | 313 | |
4a438fc5 RS |
314 | ptr = ptr + s->s_size; |
315 | } | |
4e3a36cd JB |
316 | } |
317 | ||
318 | /* fix other pointers */ | |
4a438fc5 RS |
319 | for (scns = 0; scns < f_hdr.f_nscns; scns++) |
320 | { | |
321 | struct scnhdr *s = §ion[scns]; | |
4e3a36cd | 322 | |
4a438fc5 RS |
323 | if (s->s_relptr != 0) |
324 | { | |
325 | s->s_relptr += bias; | |
326 | } | |
327 | if (s->s_lnnoptr != 0) | |
328 | { | |
329 | if (lnnoptr == 0) lnnoptr = s->s_lnnoptr; | |
330 | s->s_lnnoptr += bias; | |
331 | } | |
332 | } | |
4e3a36cd JB |
333 | |
334 | if (f_hdr.f_symptr > 0L) | |
76998edb | 335 | { |
4e3a36cd | 336 | f_hdr.f_symptr += bias; |
76998edb JB |
337 | } |
338 | ||
4e3a36cd JB |
339 | text_scnptr = f_thdr->s_scnptr; |
340 | data_scnptr = f_dhdr->s_scnptr; | |
341 | load_scnptr = f_lhdr ? f_lhdr->s_scnptr : 0; | |
76998edb | 342 | |
4e3a36cd JB |
343 | if (write (new, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) |
344 | { | |
345 | PERROR (new_name); | |
346 | } | |
76998edb | 347 | |
4e3a36cd JB |
348 | if (f_hdr.f_opthdr > 0) |
349 | { | |
350 | if (write (new, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) | |
76998edb | 351 | { |
4e3a36cd JB |
352 | PERROR (new_name); |
353 | } | |
354 | } | |
76998edb | 355 | |
4e3a36cd JB |
356 | for (scns = 0; scns < f_hdr.f_nscns; scns++) { |
357 | struct scnhdr *s = §ion[scns]; | |
358 | if (write (new, s, sizeof (*s)) != sizeof (*s)) | |
359 | { | |
360 | PERROR (new_name); | |
361 | } | |
362 | } | |
76998edb | 363 | |
4e3a36cd | 364 | return (0); |
4e3a36cd JB |
365 | } |
366 | \f | |
367 | /* **************************************************************** | |
177c0ea7 | 368 | |
4e3a36cd JB |
369 | * |
370 | * Copy the text and data segments from memory to the new a.out | |
371 | */ | |
372 | static int | |
0248680a | 373 | copy_text_and_data (int new) |
4e3a36cd | 374 | { |
0248680a DL |
375 | char *end; |
376 | char *ptr; | |
4e3a36cd | 377 | |
0248680a | 378 | lseek (new, (long) text_scnptr, SEEK_SET); |
4e3a36cd JB |
379 | ptr = start_of_text () + text_scnptr; |
380 | end = ptr + f_ohdr.tsize; | |
381 | write_segment (new, ptr, end); | |
382 | ||
0248680a DL |
383 | lseek (new, (long) data_scnptr, SEEK_SET); |
384 | ptr = (char *) f_ohdr.data_start; | |
4e3a36cd JB |
385 | end = ptr + f_ohdr.dsize; |
386 | write_segment (new, ptr, end); | |
387 | ||
388 | return 0; | |
389 | } | |
390 | ||
91b97ddb | 391 | #define UnexBlockSz (1<<12) /* read/write block size */ |
0248680a DL |
392 | static void |
393 | write_segment (int new, char *ptr, char *end) | |
4e3a36cd | 394 | { |
0248680a | 395 | int i, nwrite, ret; |
4e3a36cd | 396 | char buf[80]; |
91b97ddb | 397 | char zeros[UnexBlockSz]; |
4e3a36cd JB |
398 | |
399 | for (i = 0; ptr < end;) | |
400 | { | |
91b97ddb RS |
401 | /* distance to next block. */ |
402 | nwrite = (((int) ptr + UnexBlockSz) & -UnexBlockSz) - (int) ptr; | |
4e3a36cd JB |
403 | /* But not beyond specified end. */ |
404 | if (nwrite > end - ptr) nwrite = end - ptr; | |
405 | ret = write (new, ptr, nwrite); | |
406 | /* If write gets a page fault, it means we reached | |
407 | a gap between the old text segment and the old data segment. | |
408 | This gap has probably been remapped into part of the text segment. | |
409 | So write zeros for it. */ | |
410 | if (ret == -1 && errno == EFAULT) | |
76998edb | 411 | { |
0248680a | 412 | memset (zeros, 0, nwrite); |
91b97ddb | 413 | write (new, zeros, nwrite); |
76998edb | 414 | } |
4e3a36cd | 415 | else if (nwrite != ret) |
76998edb | 416 | { |
4e3a36cd | 417 | sprintf (buf, |
d63c1903 KH |
418 | "unexec write failure: addr 0x%lx, fileno %d, size 0x%x, wrote 0x%x, errno %d", |
419 | (unsigned long)ptr, new, nwrite, ret, errno); | |
4e3a36cd | 420 | PERROR (buf); |
76998edb | 421 | } |
4e3a36cd JB |
422 | i += nwrite; |
423 | ptr += nwrite; | |
424 | } | |
425 | } | |
426 | \f | |
427 | /* **************************************************************** | |
428 | * copy_sym | |
429 | * | |
430 | * Copy the relocation information and symbol table from the a.out to the new | |
431 | */ | |
432 | static int | |
dc44c39a | 433 | copy_sym (int new, int a_out, const char *a_name, const char *new_name) |
4e3a36cd | 434 | { |
91b97ddb | 435 | char page[UnexBlockSz]; |
4e3a36cd | 436 | int n; |
76998edb | 437 | |
4e3a36cd JB |
438 | if (a_out < 0) |
439 | return 0; | |
76998edb | 440 | |
4a438fc5 | 441 | if (orig_load_scnptr == 0L) |
4e3a36cd | 442 | return 0; |
76998edb | 443 | |
4a438fc5 | 444 | if (lnnoptr && lnnoptr < orig_load_scnptr) /* if there is line number info */ |
0248680a | 445 | lseek (a_out, lnnoptr, SEEK_SET); /* start copying from there */ |
4e3a36cd | 446 | else |
0248680a | 447 | lseek (a_out, orig_load_scnptr, SEEK_SET); /* Position a.out to symtab. */ |
4e3a36cd JB |
448 | |
449 | while ((n = read (a_out, page, sizeof page)) > 0) | |
450 | { | |
451 | if (write (new, page, n) != n) | |
76998edb | 452 | { |
4e3a36cd | 453 | PERROR (new_name); |
76998edb JB |
454 | } |
455 | } | |
4e3a36cd JB |
456 | if (n < 0) |
457 | { | |
458 | PERROR (a_name); | |
459 | } | |
460 | return 0; | |
461 | } | |
462 | \f | |
463 | /* **************************************************************** | |
464 | * mark_x | |
465 | * | |
eb8c3be9 | 466 | * After successfully building the new a.out, mark it executable |
4e3a36cd JB |
467 | */ |
468 | static void | |
dc44c39a | 469 | mark_x (const char *name) |
4e3a36cd JB |
470 | { |
471 | struct stat sbuf; | |
472 | int um; | |
473 | int new = 0; /* for PERROR */ | |
76998edb | 474 | |
4e3a36cd JB |
475 | um = umask (777); |
476 | umask (um); | |
477 | if (stat (name, &sbuf) == -1) | |
478 | { | |
479 | PERROR (name); | |
480 | } | |
481 | sbuf.st_mode |= 0111 & ~um; | |
482 | if (chmod (name, sbuf.st_mode) == -1) | |
483 | PERROR (name); | |
484 | } | |
485 | \f | |
0248680a | 486 | static int |
dc44c39a | 487 | adjust_lnnoptrs (int writedesc, int readdesc, const char *new_name) |
4e3a36cd | 488 | { |
0248680a DL |
489 | int nsyms; |
490 | int naux; | |
491 | int new; | |
4e3a36cd JB |
492 | struct syment symentry; |
493 | union auxent auxentry; | |
4e3a36cd JB |
494 | |
495 | if (!lnnoptr || !f_hdr.f_symptr) | |
496 | return 0; | |
497 | ||
0248680a | 498 | if ((new = open (new_name, O_RDWR)) < 0) |
4e3a36cd JB |
499 | { |
500 | PERROR (new_name); | |
501 | return -1; | |
502 | } | |
503 | ||
0248680a | 504 | lseek (new, f_hdr.f_symptr, SEEK_SET); |
4e3a36cd JB |
505 | for (nsyms = 0; nsyms < f_hdr.f_nsyms; nsyms++) |
506 | { | |
507 | read (new, &symentry, SYMESZ); | |
91b97ddb RS |
508 | if (symentry.n_sclass == C_BINCL || symentry.n_sclass == C_EINCL) |
509 | { | |
510 | symentry.n_value += bias; | |
0248680a | 511 | lseek (new, -SYMESZ, SEEK_CUR); |
91b97ddb RS |
512 | write (new, &symentry, SYMESZ); |
513 | } | |
514 | ||
4a438fc5 | 515 | for (naux = symentry.n_numaux; naux-- != 0; ) |
4e3a36cd JB |
516 | { |
517 | read (new, &auxentry, AUXESZ); | |
518 | nsyms++; | |
4a438fc5 RS |
519 | if (naux != 0 /* skip csect auxentry (last entry) */ |
520 | && (symentry.n_sclass == C_EXT || symentry.n_sclass == C_HIDEXT)) | |
521 | { | |
522 | auxentry.x_sym.x_fcnary.x_fcn.x_lnnoptr += bias; | |
0248680a | 523 | lseek (new, -AUXESZ, SEEK_CUR); |
4a438fc5 RS |
524 | write (new, &auxentry, AUXESZ); |
525 | } | |
4e3a36cd JB |
526 | } |
527 | } | |
528 | close (new); | |
76998edb | 529 | |
0248680a DL |
530 | return 0; |
531 | } | |
4e3a36cd | 532 | |
0248680a | 533 | static int |
dc44c39a PE |
534 | unrelocate_symbols (int new, int a_out, |
535 | const char *a_name, const char *new_name) | |
76998edb | 536 | { |
0248680a | 537 | int i; |
4e3a36cd | 538 | LDHDR ldhdr; |
0248680a | 539 | LDREL ldrel; |
4a438fc5 | 540 | ulong t_reloc = (ulong) &_text - f_ohdr.text_start; |
0248680a DL |
541 | #ifndef ALIGN_DATA_RELOC |
542 | ulong d_reloc = (ulong) &_data - f_ohdr.data_start; | |
543 | #else | |
177c0ea7 | 544 | /* This worked (and was needed) before AIX 4.2. |
0248680a | 545 | I have no idea why. -- Mike */ |
5e617bc2 | 546 | ulong d_reloc = (ulong) &_data - ALIGN (f_ohdr.data_start, 2); |
0248680a | 547 | #endif |
4e3a36cd | 548 | int * p; |
4e3a36cd JB |
549 | |
550 | if (load_scnptr == 0) | |
551 | return 0; | |
552 | ||
0248680a | 553 | lseek (a_out, orig_load_scnptr, SEEK_SET); |
4e3a36cd JB |
554 | if (read (a_out, &ldhdr, sizeof (ldhdr)) != sizeof (ldhdr)) |
555 | { | |
556 | PERROR (new_name); | |
557 | } | |
558 | ||
559 | #define SYMNDX_TEXT 0 | |
560 | #define SYMNDX_DATA 1 | |
561 | #define SYMNDX_BSS 2 | |
4e3a36cd | 562 | |
0248680a DL |
563 | for (i = 0; i < ldhdr.l_nreloc; i++) |
564 | { | |
565 | lseek (a_out, | |
566 | orig_load_scnptr + LDHDRSZ + LDSYMSZ*ldhdr.l_nsyms + LDRELSZ*i, | |
567 | SEEK_SET); | |
4e3a36cd | 568 | |
0248680a DL |
569 | if (read (a_out, &ldrel, LDRELSZ) != LDRELSZ) |
570 | { | |
571 | PERROR (a_name); | |
572 | } | |
4e3a36cd JB |
573 | |
574 | /* move the BSS loader symbols to the DATA segment */ | |
0248680a | 575 | if (ldrel.l_symndx == SYMNDX_BSS) |
4e3a36cd | 576 | { |
0248680a | 577 | ldrel.l_symndx = SYMNDX_DATA; |
91b97ddb | 578 | |
4e3a36cd JB |
579 | lseek (new, |
580 | load_scnptr + LDHDRSZ + LDSYMSZ*ldhdr.l_nsyms + LDRELSZ*i, | |
0248680a | 581 | SEEK_SET); |
4e3a36cd | 582 | |
0248680a | 583 | if (write (new, &ldrel, LDRELSZ) != LDRELSZ) |
4e3a36cd JB |
584 | { |
585 | PERROR (new_name); | |
586 | } | |
587 | } | |
588 | ||
0248680a | 589 | if (ldrel.l_rsecnm == f_ohdr.o_sndata) |
4e3a36cd JB |
590 | { |
591 | int orig_int; | |
592 | ||
4a438fc5 | 593 | lseek (a_out, |
0248680a DL |
594 | orig_data_scnptr + (ldrel.l_vaddr - f_ohdr.data_start), |
595 | SEEK_SET); | |
4e3a36cd | 596 | |
0248680a DL |
597 | if (read (a_out, (void *) &orig_int, sizeof (orig_int)) |
598 | != sizeof (orig_int)) | |
4e3a36cd JB |
599 | { |
600 | PERROR (a_name); | |
601 | } | |
602 | ||
0248680a | 603 | p = (int *) (ldrel.l_vaddr + d_reloc); |
4a438fc5 | 604 | |
0248680a | 605 | switch (ldrel.l_symndx) { |
4e3a36cd | 606 | case SYMNDX_TEXT: |
4a438fc5 | 607 | orig_int = * p - t_reloc; |
4e3a36cd JB |
608 | break; |
609 | ||
610 | case SYMNDX_DATA: | |
611 | case SYMNDX_BSS: | |
4a438fc5 | 612 | orig_int = * p - d_reloc; |
4e3a36cd JB |
613 | break; |
614 | } | |
615 | ||
4a438fc5 RS |
616 | if (orig_int != * p) |
617 | { | |
618 | lseek (new, | |
0248680a DL |
619 | data_scnptr + (ldrel.l_vaddr - f_ohdr.data_start), |
620 | SEEK_SET); | |
4a438fc5 RS |
621 | if (write (new, (void *) &orig_int, sizeof (orig_int)) |
622 | != sizeof (orig_int)) | |
623 | { | |
624 | PERROR (new_name); | |
625 | } | |
626 | } | |
4e3a36cd JB |
627 | } |
628 | } | |
0248680a | 629 | return 0; |
76998edb | 630 | } |
ab5796a9 | 631 | |
313d9eb2 DN |
632 | /* |
633 | * Return the address of the start of the text segment prior to | |
634 | * doing an unexec. After unexec the return value is undefined. | |
635 | * See crt0.c for further explanation and _start. | |
636 | * | |
637 | */ | |
638 | ||
639 | char * | |
640 | start_of_text (void) | |
641 | { | |
642 | return ((char *) 0x10000000); | |
643 | } |