Commit | Line | Data |
---|---|---|
0248680a | 1 | /* Dump an executable image. |
429ab54e | 2 | Copyright (C) 1985, 1986, 1987, 1988, 1999, 2001, 2002, 2003, 2004, |
5df4f04c | 3 | 2005, 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, 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> |
4e3a36cd | 44 | #define PERROR(file) report_error (file, new) |
4e3a36cd JB |
45 | #include <a.out.h> |
46 | /* Define getpagesize () if the system does not. | |
47 | Note that this may depend on symbols defined in a.out.h | |
48 | */ | |
49 | #include "getpagesize.h" | |
76998edb | 50 | |
4e3a36cd | 51 | #include <sys/types.h> |
4e3a36cd JB |
52 | #include <stdio.h> |
53 | #include <sys/stat.h> | |
54 | #include <errno.h> | |
0248680a DL |
55 | #include <unistd.h> |
56 | #include <fcntl.h> | |
4e3a36cd | 57 | |
313d9eb2 | 58 | char *start_of_text (void); /* Start of text */ |
0248680a | 59 | extern char *start_of_data (void); /* Start of initialized data */ |
4e3a36cd JB |
60 | |
61 | extern int _data; | |
4e3a36cd | 62 | extern int _text; |
0248680a | 63 | |
4e3a36cd JB |
64 | #include <filehdr.h> |
65 | #include <aouthdr.h> | |
66 | #include <scnhdr.h> | |
67 | #include <syms.h> | |
0248680a | 68 | |
4e3a36cd JB |
69 | static struct filehdr f_hdr; /* File header */ |
70 | static struct aouthdr f_ohdr; /* Optional file header (a.out) */ | |
0248680a DL |
71 | static long bias; /* Bias to add for growth */ |
72 | static long lnnoptr; /* Pointer to line-number info within file */ | |
4e3a36cd JB |
73 | |
74 | static long text_scnptr; | |
75 | static long data_scnptr; | |
4a438fc5 | 76 | #define ALIGN(val, pwr) (((val) + ((1L<<(pwr))-1)) & ~((1L<<(pwr))-1)) |
4e3a36cd JB |
77 | static long load_scnptr; |
78 | static long orig_load_scnptr; | |
79 | static long orig_data_scnptr; | |
0248680a | 80 | static int unrelocate_symbols (int, int, char *, char *); |
4e3a36cd JB |
81 | |
82 | #ifndef MAX_SECTIONS | |
83 | #define MAX_SECTIONS 10 | |
84 | #endif | |
85 | ||
0248680a | 86 | static int adjust_lnnoptrs (int, int, char *); |
4e3a36cd JB |
87 | |
88 | static int pagemask; | |
89 | ||
d7306fe6 | 90 | #include <setjmp.h> |
8eca17c9 | 91 | #include "lisp.h" |
4e3a36cd | 92 | |
0248680a DL |
93 | static void |
94 | report_error (char *file, int fd) | |
4e3a36cd JB |
95 | { |
96 | if (fd) | |
97 | close (fd); | |
8eca17c9 | 98 | report_file_error ("Cannot unexec", Fcons (build_string (file), Qnil)); |
4e3a36cd | 99 | } |
76998edb | 100 | |
4e3a36cd JB |
101 | #define ERROR0(msg) report_error_1 (new, msg, 0, 0); return -1 |
102 | #define ERROR1(msg,x) report_error_1 (new, msg, x, 0); return -1 | |
103 | #define ERROR2(msg,x,y) report_error_1 (new, msg, x, y); return -1 | |
76998edb | 104 | |
0248680a DL |
105 | static void |
106 | report_error_1 (int fd, char *msg, int a1, int a2) | |
76998edb | 107 | { |
4e3a36cd | 108 | close (fd); |
4e3a36cd | 109 | error (msg, a1, a2); |
4e3a36cd JB |
110 | } |
111 | ||
0248680a DL |
112 | static int make_hdr (int, int, unsigned, unsigned, unsigned, char *, char *); |
113 | static void mark_x (char *); | |
114 | static int copy_text_and_data (int); | |
115 | static int copy_sym (int, int, char *, char *); | |
116 | static void write_segment (int, char *, char *); | |
4e3a36cd JB |
117 | \f |
118 | /* **************************************************************** | |
119 | * unexec | |
120 | * | |
121 | * driving logic. | |
122 | */ | |
dd5ecd6b | 123 | int unexec (const char *new_name, const char *a_name) |
76998edb | 124 | { |
0248680a | 125 | int new = -1, a_out = -1; |
4e3a36cd | 126 | |
0248680a | 127 | if (a_name && (a_out = open (a_name, O_RDONLY)) < 0) |
4e3a36cd JB |
128 | { |
129 | PERROR (a_name); | |
130 | } | |
131 | if ((new = creat (new_name, 0666)) < 0) | |
132 | { | |
133 | PERROR (new_name); | |
134 | } | |
0248680a | 135 | if (make_hdr (new, a_out, |
0248680a | 136 | a_name, new_name) < 0 |
4e3a36cd JB |
137 | || copy_text_and_data (new) < 0 |
138 | || copy_sym (new, a_out, a_name, new_name) < 0 | |
4e3a36cd | 139 | || adjust_lnnoptrs (new, a_out, new_name) < 0 |
0248680a | 140 | || unrelocate_symbols (new, a_out, a_name, new_name) < 0) |
76998edb | 141 | { |
4e3a36cd | 142 | close (new); |
177c0ea7 | 143 | return -1; |
76998edb | 144 | } |
76998edb | 145 | |
4e3a36cd JB |
146 | close (new); |
147 | if (a_out >= 0) | |
148 | close (a_out); | |
149 | mark_x (new_name); | |
150 | return 0; | |
151 | } | |
152 | ||
153 | /* **************************************************************** | |
154 | * make_hdr | |
155 | * | |
156 | * Make the header in the new a.out from the header in core. | |
157 | * Modify the text and data sizes. | |
158 | */ | |
159 | static int | |
0248680a | 160 | make_hdr (int new, int a_out, |
0248680a | 161 | char *a_name, char *new_name) |
4e3a36cd | 162 | { |
0248680a | 163 | int scns; |
dd5ecd6b DN |
164 | unsigned int bss_start; |
165 | unsigned int data_start; | |
4e3a36cd JB |
166 | |
167 | struct scnhdr section[MAX_SECTIONS]; | |
168 | struct scnhdr * f_thdr; /* Text section header */ | |
169 | struct scnhdr * f_dhdr; /* Data section header */ | |
170 | struct scnhdr * f_bhdr; /* Bss section header */ | |
171 | struct scnhdr * f_lhdr; /* Loader section header */ | |
172 | struct scnhdr * f_tchdr; /* Typechk section header */ | |
173 | struct scnhdr * f_dbhdr; /* Debug section header */ | |
174 | struct scnhdr * f_xhdr; /* Except section header */ | |
175 | ||
176 | load_scnptr = orig_load_scnptr = lnnoptr = 0; | |
177 | pagemask = getpagesize () - 1; | |
178 | ||
179 | /* Adjust text/data boundary. */ | |
4e3a36cd | 180 | data_start = (long) start_of_data (); |
4e3a36cd JB |
181 | data_start = ADDR_CORRECT (data_start); |
182 | ||
4e3a36cd | 183 | data_start = data_start & ~pagemask; /* (Down) to page boundary. */ |
4e3a36cd | 184 | |
dd5ecd6b DN |
185 | bss_start = ADDR_CORRECT (sbrk (0)) + pagemask; |
186 | bss_start &= ~ pagemask; | |
76998edb | 187 | |
4e3a36cd JB |
188 | if (data_start > bss_start) /* Can't have negative data size. */ |
189 | { | |
190 | ERROR2 ("unexec: data_start (%u) can't be greater than bss_start (%u)", | |
191 | data_start, bss_start); | |
192 | } | |
76998edb | 193 | |
4e3a36cd | 194 | /* Salvage as much info from the existing file as possible */ |
4e3a36cd JB |
195 | f_thdr = NULL; f_dhdr = NULL; f_bhdr = NULL; |
196 | f_lhdr = NULL; f_tchdr = NULL; f_dbhdr = NULL; f_xhdr = NULL; | |
197 | if (a_out >= 0) | |
76998edb | 198 | { |
4e3a36cd JB |
199 | if (read (a_out, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) |
200 | { | |
201 | PERROR (a_name); | |
202 | } | |
4e3a36cd JB |
203 | if (f_hdr.f_opthdr > 0) |
204 | { | |
205 | if (read (a_out, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) | |
206 | { | |
207 | PERROR (a_name); | |
208 | } | |
4e3a36cd JB |
209 | } |
210 | if (f_hdr.f_nscns > MAX_SECTIONS) | |
211 | { | |
212 | ERROR0 ("unexec: too many section headers -- increase MAX_SECTIONS"); | |
213 | } | |
214 | /* Loop through section headers */ | |
215 | for (scns = 0; scns < f_hdr.f_nscns; scns++) { | |
216 | struct scnhdr *s = §ion[scns]; | |
217 | if (read (a_out, s, sizeof (*s)) != sizeof (*s)) | |
218 | { | |
219 | PERROR (a_name); | |
220 | } | |
4e3a36cd JB |
221 | |
222 | #define CHECK_SCNHDR(ptr, name, flags) \ | |
223 | if (strcmp(s->s_name, name) == 0) { \ | |
224 | if (s->s_flags != flags) { \ | |
d63c1903 KH |
225 | fprintf(stderr, "unexec: %lx flags where %x expected in %s section.\n", \ |
226 | (unsigned long)s->s_flags, flags, name); \ | |
4e3a36cd JB |
227 | } \ |
228 | if (ptr) { \ | |
229 | fprintf(stderr, "unexec: duplicate section header for section %s.\n", \ | |
230 | name); \ | |
231 | } \ | |
232 | ptr = s; \ | |
233 | } | |
234 | CHECK_SCNHDR(f_thdr, _TEXT, STYP_TEXT); | |
235 | CHECK_SCNHDR(f_dhdr, _DATA, STYP_DATA); | |
236 | CHECK_SCNHDR(f_bhdr, _BSS, STYP_BSS); | |
237 | CHECK_SCNHDR(f_lhdr, _LOADER, STYP_LOADER); | |
238 | CHECK_SCNHDR(f_dbhdr, _DEBUG, STYP_DEBUG); | |
239 | CHECK_SCNHDR(f_tchdr, _TYPCHK, STYP_TYPCHK); | |
240 | CHECK_SCNHDR(f_xhdr, _EXCEPT, STYP_EXCEPT); | |
241 | } | |
242 | ||
243 | if (f_thdr == 0) | |
244 | { | |
0248680a | 245 | ERROR1 ("unexec: couldn't find \"%s\" section", (int) _TEXT); |
4e3a36cd JB |
246 | } |
247 | if (f_dhdr == 0) | |
248 | { | |
0248680a | 249 | ERROR1 ("unexec: couldn't find \"%s\" section", (int) _DATA); |
4e3a36cd JB |
250 | } |
251 | if (f_bhdr == 0) | |
252 | { | |
0248680a | 253 | ERROR1 ("unexec: couldn't find \"%s\" section", (int) _BSS); |
4e3a36cd | 254 | } |
76998edb | 255 | } |
4e3a36cd | 256 | else |
76998edb | 257 | { |
4e3a36cd | 258 | ERROR0 ("can't build a COFF file from scratch yet"); |
76998edb | 259 | } |
4e3a36cd JB |
260 | orig_data_scnptr = f_dhdr->s_scnptr; |
261 | orig_load_scnptr = f_lhdr ? f_lhdr->s_scnptr : 0; | |
262 | ||
263 | /* Now we alter the contents of all the f_*hdr variables | |
264 | to correspond to what we want to dump. */ | |
4a438fc5 RS |
265 | |
266 | /* Indicate that the reloc information is no longer valid for ld (bind); | |
267 | we only update it enough to fake out the exec-time loader. */ | |
268 | f_hdr.f_flags |= (F_RELFLG | F_EXEC); | |
269 | ||
0248680a | 270 | f_ohdr.dsize = bss_start - f_ohdr.data_start; |
dd5ecd6b | 271 | f_ohdr.bsize = 0; |
4e3a36cd JB |
272 | |
273 | f_dhdr->s_size = f_ohdr.dsize; | |
274 | f_bhdr->s_size = f_ohdr.bsize; | |
4a438fc5 RS |
275 | f_bhdr->s_paddr = f_ohdr.data_start + f_ohdr.dsize; |
276 | f_bhdr->s_vaddr = f_ohdr.data_start + f_ohdr.dsize; | |
4e3a36cd JB |
277 | |
278 | /* fix scnptr's */ | |
279 | { | |
4a438fc5 | 280 | ulong ptr = section[0].s_scnptr; |
4e3a36cd | 281 | |
4a438fc5 RS |
282 | bias = -1; |
283 | for (scns = 0; scns < f_hdr.f_nscns; scns++) | |
284 | { | |
285 | struct scnhdr *s = §ion[scns]; | |
4e3a36cd | 286 | |
4a438fc5 RS |
287 | if (s->s_flags & STYP_PAD) /* .pad sections omitted in AIX 4.1 */ |
288 | { | |
289 | /* | |
290 | * the text_start should probably be o_algntext but that doesn't | |
291 | * seem to change | |
292 | */ | |
293 | if (f_ohdr.text_start != 0) /* && scns != 0 */ | |
294 | { | |
295 | s->s_size = 512 - (ptr % 512); | |
296 | if (s->s_size == 512) | |
297 | s->s_size = 0; | |
298 | } | |
299 | s->s_scnptr = ptr; | |
300 | } | |
301 | else if (s->s_flags & STYP_DATA) | |
4e3a36cd | 302 | s->s_scnptr = ptr; |
4a438fc5 RS |
303 | else if (!(s->s_flags & (STYP_TEXT | STYP_BSS))) |
304 | { | |
305 | if (bias == -1) /* if first section after bss */ | |
306 | bias = ptr - s->s_scnptr; | |
4e3a36cd | 307 | |
4a438fc5 RS |
308 | s->s_scnptr += bias; |
309 | ptr = s->s_scnptr; | |
310 | } | |
177c0ea7 | 311 | |
4a438fc5 RS |
312 | ptr = ptr + s->s_size; |
313 | } | |
4e3a36cd JB |
314 | } |
315 | ||
316 | /* fix other pointers */ | |
4a438fc5 RS |
317 | for (scns = 0; scns < f_hdr.f_nscns; scns++) |
318 | { | |
319 | struct scnhdr *s = §ion[scns]; | |
4e3a36cd | 320 | |
4a438fc5 RS |
321 | if (s->s_relptr != 0) |
322 | { | |
323 | s->s_relptr += bias; | |
324 | } | |
325 | if (s->s_lnnoptr != 0) | |
326 | { | |
327 | if (lnnoptr == 0) lnnoptr = s->s_lnnoptr; | |
328 | s->s_lnnoptr += bias; | |
329 | } | |
330 | } | |
4e3a36cd JB |
331 | |
332 | if (f_hdr.f_symptr > 0L) | |
76998edb | 333 | { |
4e3a36cd | 334 | f_hdr.f_symptr += bias; |
76998edb JB |
335 | } |
336 | ||
4e3a36cd JB |
337 | text_scnptr = f_thdr->s_scnptr; |
338 | data_scnptr = f_dhdr->s_scnptr; | |
339 | load_scnptr = f_lhdr ? f_lhdr->s_scnptr : 0; | |
76998edb | 340 | |
4e3a36cd JB |
341 | if (write (new, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) |
342 | { | |
343 | PERROR (new_name); | |
344 | } | |
76998edb | 345 | |
4e3a36cd JB |
346 | if (f_hdr.f_opthdr > 0) |
347 | { | |
348 | if (write (new, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) | |
76998edb | 349 | { |
4e3a36cd JB |
350 | PERROR (new_name); |
351 | } | |
352 | } | |
76998edb | 353 | |
4e3a36cd JB |
354 | for (scns = 0; scns < f_hdr.f_nscns; scns++) { |
355 | struct scnhdr *s = §ion[scns]; | |
356 | if (write (new, s, sizeof (*s)) != sizeof (*s)) | |
357 | { | |
358 | PERROR (new_name); | |
359 | } | |
360 | } | |
76998edb | 361 | |
4e3a36cd | 362 | return (0); |
4e3a36cd JB |
363 | } |
364 | \f | |
365 | /* **************************************************************** | |
177c0ea7 | 366 | |
4e3a36cd JB |
367 | * |
368 | * Copy the text and data segments from memory to the new a.out | |
369 | */ | |
370 | static int | |
0248680a | 371 | copy_text_and_data (int new) |
4e3a36cd | 372 | { |
0248680a DL |
373 | char *end; |
374 | char *ptr; | |
4e3a36cd | 375 | |
0248680a | 376 | lseek (new, (long) text_scnptr, SEEK_SET); |
4e3a36cd JB |
377 | ptr = start_of_text () + text_scnptr; |
378 | end = ptr + f_ohdr.tsize; | |
379 | write_segment (new, ptr, end); | |
380 | ||
0248680a DL |
381 | lseek (new, (long) data_scnptr, SEEK_SET); |
382 | ptr = (char *) f_ohdr.data_start; | |
4e3a36cd JB |
383 | end = ptr + f_ohdr.dsize; |
384 | write_segment (new, ptr, end); | |
385 | ||
386 | return 0; | |
387 | } | |
388 | ||
91b97ddb | 389 | #define UnexBlockSz (1<<12) /* read/write block size */ |
0248680a DL |
390 | static void |
391 | write_segment (int new, char *ptr, char *end) | |
4e3a36cd | 392 | { |
0248680a | 393 | int i, nwrite, ret; |
4e3a36cd | 394 | char buf[80]; |
91b97ddb | 395 | char zeros[UnexBlockSz]; |
4e3a36cd JB |
396 | |
397 | for (i = 0; ptr < end;) | |
398 | { | |
91b97ddb RS |
399 | /* distance to next block. */ |
400 | nwrite = (((int) ptr + UnexBlockSz) & -UnexBlockSz) - (int) ptr; | |
4e3a36cd JB |
401 | /* But not beyond specified end. */ |
402 | if (nwrite > end - ptr) nwrite = end - ptr; | |
403 | ret = write (new, ptr, nwrite); | |
404 | /* If write gets a page fault, it means we reached | |
405 | a gap between the old text segment and the old data segment. | |
406 | This gap has probably been remapped into part of the text segment. | |
407 | So write zeros for it. */ | |
408 | if (ret == -1 && errno == EFAULT) | |
76998edb | 409 | { |
0248680a | 410 | memset (zeros, 0, nwrite); |
91b97ddb | 411 | write (new, zeros, nwrite); |
76998edb | 412 | } |
4e3a36cd | 413 | else if (nwrite != ret) |
76998edb | 414 | { |
4e3a36cd | 415 | sprintf (buf, |
d63c1903 KH |
416 | "unexec write failure: addr 0x%lx, fileno %d, size 0x%x, wrote 0x%x, errno %d", |
417 | (unsigned long)ptr, new, nwrite, ret, errno); | |
4e3a36cd | 418 | PERROR (buf); |
76998edb | 419 | } |
4e3a36cd JB |
420 | i += nwrite; |
421 | ptr += nwrite; | |
422 | } | |
423 | } | |
424 | \f | |
425 | /* **************************************************************** | |
426 | * copy_sym | |
427 | * | |
428 | * Copy the relocation information and symbol table from the a.out to the new | |
429 | */ | |
430 | static int | |
0248680a | 431 | copy_sym (int new, int a_out, char *a_name, char *new_name) |
4e3a36cd | 432 | { |
91b97ddb | 433 | char page[UnexBlockSz]; |
4e3a36cd | 434 | int n; |
76998edb | 435 | |
4e3a36cd JB |
436 | if (a_out < 0) |
437 | return 0; | |
76998edb | 438 | |
4a438fc5 | 439 | if (orig_load_scnptr == 0L) |
4e3a36cd | 440 | return 0; |
76998edb | 441 | |
4a438fc5 | 442 | if (lnnoptr && lnnoptr < orig_load_scnptr) /* if there is line number info */ |
0248680a | 443 | lseek (a_out, lnnoptr, SEEK_SET); /* start copying from there */ |
4e3a36cd | 444 | else |
0248680a | 445 | lseek (a_out, orig_load_scnptr, SEEK_SET); /* Position a.out to symtab. */ |
4e3a36cd JB |
446 | |
447 | while ((n = read (a_out, page, sizeof page)) > 0) | |
448 | { | |
449 | if (write (new, page, n) != n) | |
76998edb | 450 | { |
4e3a36cd | 451 | PERROR (new_name); |
76998edb JB |
452 | } |
453 | } | |
4e3a36cd JB |
454 | if (n < 0) |
455 | { | |
456 | PERROR (a_name); | |
457 | } | |
458 | return 0; | |
459 | } | |
460 | \f | |
461 | /* **************************************************************** | |
462 | * mark_x | |
463 | * | |
eb8c3be9 | 464 | * After successfully building the new a.out, mark it executable |
4e3a36cd JB |
465 | */ |
466 | static void | |
0248680a | 467 | mark_x (char *name) |
4e3a36cd JB |
468 | { |
469 | struct stat sbuf; | |
470 | int um; | |
471 | int new = 0; /* for PERROR */ | |
76998edb | 472 | |
4e3a36cd JB |
473 | um = umask (777); |
474 | umask (um); | |
475 | if (stat (name, &sbuf) == -1) | |
476 | { | |
477 | PERROR (name); | |
478 | } | |
479 | sbuf.st_mode |= 0111 & ~um; | |
480 | if (chmod (name, sbuf.st_mode) == -1) | |
481 | PERROR (name); | |
482 | } | |
483 | \f | |
0248680a DL |
484 | static int |
485 | adjust_lnnoptrs (int writedesc, int readdesc, char *new_name) | |
4e3a36cd | 486 | { |
0248680a DL |
487 | int nsyms; |
488 | int naux; | |
489 | int new; | |
4e3a36cd JB |
490 | struct syment symentry; |
491 | union auxent auxentry; | |
4e3a36cd JB |
492 | |
493 | if (!lnnoptr || !f_hdr.f_symptr) | |
494 | return 0; | |
495 | ||
0248680a | 496 | if ((new = open (new_name, O_RDWR)) < 0) |
4e3a36cd JB |
497 | { |
498 | PERROR (new_name); | |
499 | return -1; | |
500 | } | |
501 | ||
0248680a | 502 | lseek (new, f_hdr.f_symptr, SEEK_SET); |
4e3a36cd JB |
503 | for (nsyms = 0; nsyms < f_hdr.f_nsyms; nsyms++) |
504 | { | |
505 | read (new, &symentry, SYMESZ); | |
91b97ddb RS |
506 | if (symentry.n_sclass == C_BINCL || symentry.n_sclass == C_EINCL) |
507 | { | |
508 | symentry.n_value += bias; | |
0248680a | 509 | lseek (new, -SYMESZ, SEEK_CUR); |
91b97ddb RS |
510 | write (new, &symentry, SYMESZ); |
511 | } | |
512 | ||
4a438fc5 | 513 | for (naux = symentry.n_numaux; naux-- != 0; ) |
4e3a36cd JB |
514 | { |
515 | read (new, &auxentry, AUXESZ); | |
516 | nsyms++; | |
4a438fc5 RS |
517 | if (naux != 0 /* skip csect auxentry (last entry) */ |
518 | && (symentry.n_sclass == C_EXT || symentry.n_sclass == C_HIDEXT)) | |
519 | { | |
520 | auxentry.x_sym.x_fcnary.x_fcn.x_lnnoptr += bias; | |
0248680a | 521 | lseek (new, -AUXESZ, SEEK_CUR); |
4a438fc5 RS |
522 | write (new, &auxentry, AUXESZ); |
523 | } | |
4e3a36cd JB |
524 | } |
525 | } | |
526 | close (new); | |
76998edb | 527 | |
0248680a DL |
528 | return 0; |
529 | } | |
4e3a36cd | 530 | |
0248680a DL |
531 | static int |
532 | unrelocate_symbols (int new, int a_out, char *a_name, char *new_name) | |
76998edb | 533 | { |
0248680a | 534 | int i; |
4e3a36cd | 535 | LDHDR ldhdr; |
0248680a | 536 | LDREL ldrel; |
4a438fc5 | 537 | ulong t_reloc = (ulong) &_text - f_ohdr.text_start; |
0248680a DL |
538 | #ifndef ALIGN_DATA_RELOC |
539 | ulong d_reloc = (ulong) &_data - f_ohdr.data_start; | |
540 | #else | |
177c0ea7 | 541 | /* This worked (and was needed) before AIX 4.2. |
0248680a | 542 | I have no idea why. -- Mike */ |
4a438fc5 | 543 | ulong d_reloc = (ulong) &_data - ALIGN(f_ohdr.data_start, 2); |
0248680a | 544 | #endif |
4e3a36cd | 545 | int * p; |
4e3a36cd JB |
546 | |
547 | if (load_scnptr == 0) | |
548 | return 0; | |
549 | ||
0248680a | 550 | lseek (a_out, orig_load_scnptr, SEEK_SET); |
4e3a36cd JB |
551 | if (read (a_out, &ldhdr, sizeof (ldhdr)) != sizeof (ldhdr)) |
552 | { | |
553 | PERROR (new_name); | |
554 | } | |
555 | ||
556 | #define SYMNDX_TEXT 0 | |
557 | #define SYMNDX_DATA 1 | |
558 | #define SYMNDX_BSS 2 | |
4e3a36cd | 559 | |
0248680a DL |
560 | for (i = 0; i < ldhdr.l_nreloc; i++) |
561 | { | |
562 | lseek (a_out, | |
563 | orig_load_scnptr + LDHDRSZ + LDSYMSZ*ldhdr.l_nsyms + LDRELSZ*i, | |
564 | SEEK_SET); | |
4e3a36cd | 565 | |
0248680a DL |
566 | if (read (a_out, &ldrel, LDRELSZ) != LDRELSZ) |
567 | { | |
568 | PERROR (a_name); | |
569 | } | |
4e3a36cd JB |
570 | |
571 | /* move the BSS loader symbols to the DATA segment */ | |
0248680a | 572 | if (ldrel.l_symndx == SYMNDX_BSS) |
4e3a36cd | 573 | { |
0248680a | 574 | ldrel.l_symndx = SYMNDX_DATA; |
91b97ddb | 575 | |
4e3a36cd JB |
576 | lseek (new, |
577 | load_scnptr + LDHDRSZ + LDSYMSZ*ldhdr.l_nsyms + LDRELSZ*i, | |
0248680a | 578 | SEEK_SET); |
4e3a36cd | 579 | |
0248680a | 580 | if (write (new, &ldrel, LDRELSZ) != LDRELSZ) |
4e3a36cd JB |
581 | { |
582 | PERROR (new_name); | |
583 | } | |
584 | } | |
585 | ||
0248680a | 586 | if (ldrel.l_rsecnm == f_ohdr.o_sndata) |
4e3a36cd JB |
587 | { |
588 | int orig_int; | |
589 | ||
4a438fc5 | 590 | lseek (a_out, |
0248680a DL |
591 | orig_data_scnptr + (ldrel.l_vaddr - f_ohdr.data_start), |
592 | SEEK_SET); | |
4e3a36cd | 593 | |
0248680a DL |
594 | if (read (a_out, (void *) &orig_int, sizeof (orig_int)) |
595 | != sizeof (orig_int)) | |
4e3a36cd JB |
596 | { |
597 | PERROR (a_name); | |
598 | } | |
599 | ||
0248680a | 600 | p = (int *) (ldrel.l_vaddr + d_reloc); |
4a438fc5 | 601 | |
0248680a | 602 | switch (ldrel.l_symndx) { |
4e3a36cd | 603 | case SYMNDX_TEXT: |
4a438fc5 | 604 | orig_int = * p - t_reloc; |
4e3a36cd JB |
605 | break; |
606 | ||
607 | case SYMNDX_DATA: | |
608 | case SYMNDX_BSS: | |
4a438fc5 | 609 | orig_int = * p - d_reloc; |
4e3a36cd JB |
610 | break; |
611 | } | |
612 | ||
4a438fc5 RS |
613 | if (orig_int != * p) |
614 | { | |
615 | lseek (new, | |
0248680a DL |
616 | data_scnptr + (ldrel.l_vaddr - f_ohdr.data_start), |
617 | SEEK_SET); | |
4a438fc5 RS |
618 | if (write (new, (void *) &orig_int, sizeof (orig_int)) |
619 | != sizeof (orig_int)) | |
620 | { | |
621 | PERROR (new_name); | |
622 | } | |
623 | } | |
4e3a36cd JB |
624 | } |
625 | } | |
0248680a | 626 | return 0; |
76998edb | 627 | } |
ab5796a9 | 628 | |
313d9eb2 DN |
629 | /* |
630 | * Return the address of the start of the text segment prior to | |
631 | * doing an unexec. After unexec the return value is undefined. | |
632 | * See crt0.c for further explanation and _start. | |
633 | * | |
634 | */ | |
635 | ||
636 | char * | |
637 | start_of_text (void) | |
638 | { | |
639 | return ((char *) 0x10000000); | |
640 | } | |
641 | ||
ab5796a9 MB |
642 | /* arch-tag: 0783857a-7c2d-456f-a426-58b722d69fd0 |
643 | (do not change this comment) */ |