Commit | Line | Data |
---|---|---|
0248680a | 1 | /* Dump an executable image. |
73b0cd50 | 2 | Copyright (C) 1985-1988, 1999, 2001-2011 Free Software Foundation, Inc. |
4e3a36cd | 3 | |
3b7ad313 EN |
4 | This file is part of GNU Emacs. |
5 | ||
9ec0b715 | 6 | GNU Emacs is free software: you can redistribute it and/or modify |
3b7ad313 | 7 | it under the terms of the GNU General Public License as published by |
9ec0b715 GM |
8 | the Free Software Foundation, either version 3 of the License, or |
9 | (at your option) any later version. | |
3b7ad313 EN |
10 | |
11 | GNU Emacs is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
9ec0b715 | 17 | along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */ |
4e3a36cd | 18 | |
9ec0b715 | 19 | /* |
4e3a36cd JB |
20 | In other words, you are welcome to use, share and improve this program. |
21 | You are forbidden to forbid anyone else to use, share and improve | |
22 | what you give them. Help stamp out software-hoarding! */ | |
23 | ||
24 | ||
0248680a | 25 | /* Originally based on the COFF unexec.c by Spencer W. Thomas. |
4e3a36cd | 26 | * |
0248680a DL |
27 | * Subsequently hacked on by |
28 | * Bill Mann <Bill_Man@praxisint.com> | |
29 | * Andrew Vignaux <Andrew.Vignaux@comp.vuw.ac.nz> | |
30 | * Mike Sperber <sperber@informatik.uni-tuebingen.de> | |
4a438fc5 | 31 | * |
4e3a36cd | 32 | * Synopsis: |
dd5ecd6b | 33 | * unexec (const char *new_name, const *old_name); |
4e3a36cd JB |
34 | * |
35 | * Takes a snapshot of the program and makes an a.out format file in the | |
36 | * file named by the string argument new_name. | |
37 | * If a_name is non-NULL, the symbol table will be taken from the given file. | |
38 | * On some machines, an existing a_name file is required. | |
39 | * | |
4e3a36cd JB |
40 | */ |
41 | ||
18160b98 | 42 | #include <config.h> |
4e3a36cd | 43 | #define PERROR(file) report_error (file, new) |
4e3a36cd JB |
44 | #include <a.out.h> |
45 | /* Define getpagesize () if the system does not. | |
46 | Note that this may depend on symbols defined in a.out.h | |
47 | */ | |
48 | #include "getpagesize.h" | |
76998edb | 49 | |
4e3a36cd | 50 | #include <sys/types.h> |
4e3a36cd JB |
51 | #include <stdio.h> |
52 | #include <sys/stat.h> | |
53 | #include <errno.h> | |
0248680a DL |
54 | #include <unistd.h> |
55 | #include <fcntl.h> | |
4e3a36cd | 56 | |
313d9eb2 | 57 | char *start_of_text (void); /* Start of text */ |
0248680a | 58 | extern char *start_of_data (void); /* Start of initialized data */ |
4e3a36cd JB |
59 | |
60 | extern int _data; | |
4e3a36cd | 61 | extern int _text; |
0248680a | 62 | |
4e3a36cd JB |
63 | #include <filehdr.h> |
64 | #include <aouthdr.h> | |
65 | #include <scnhdr.h> | |
66 | #include <syms.h> | |
0248680a | 67 | |
4e3a36cd JB |
68 | static struct filehdr f_hdr; /* File header */ |
69 | static struct aouthdr f_ohdr; /* Optional file header (a.out) */ | |
0248680a DL |
70 | static long bias; /* Bias to add for growth */ |
71 | static long lnnoptr; /* Pointer to line-number info within file */ | |
4e3a36cd JB |
72 | |
73 | static long text_scnptr; | |
74 | static long data_scnptr; | |
4a438fc5 | 75 | #define ALIGN(val, pwr) (((val) + ((1L<<(pwr))-1)) & ~((1L<<(pwr))-1)) |
4e3a36cd JB |
76 | static long load_scnptr; |
77 | static long orig_load_scnptr; | |
78 | static long orig_data_scnptr; | |
0248680a | 79 | static int unrelocate_symbols (int, int, char *, char *); |
4e3a36cd JB |
80 | |
81 | #ifndef MAX_SECTIONS | |
82 | #define MAX_SECTIONS 10 | |
83 | #endif | |
84 | ||
0248680a | 85 | static int adjust_lnnoptrs (int, int, char *); |
4e3a36cd JB |
86 | |
87 | static int pagemask; | |
88 | ||
d7306fe6 | 89 | #include <setjmp.h> |
8eca17c9 | 90 | #include "lisp.h" |
4e3a36cd | 91 | |
0248680a DL |
92 | static void |
93 | report_error (char *file, int fd) | |
4e3a36cd JB |
94 | { |
95 | if (fd) | |
96 | close (fd); | |
8eca17c9 | 97 | report_file_error ("Cannot unexec", Fcons (build_string (file), Qnil)); |
4e3a36cd | 98 | } |
76998edb | 99 | |
4e3a36cd JB |
100 | #define ERROR0(msg) report_error_1 (new, msg, 0, 0); return -1 |
101 | #define ERROR1(msg,x) report_error_1 (new, msg, x, 0); return -1 | |
102 | #define ERROR2(msg,x,y) report_error_1 (new, msg, x, y); return -1 | |
76998edb | 103 | |
0248680a DL |
104 | static void |
105 | report_error_1 (int fd, char *msg, int a1, int a2) | |
76998edb | 106 | { |
4e3a36cd | 107 | close (fd); |
4e3a36cd | 108 | error (msg, a1, a2); |
4e3a36cd JB |
109 | } |
110 | ||
0248680a DL |
111 | static int make_hdr (int, int, unsigned, unsigned, unsigned, char *, char *); |
112 | static void mark_x (char *); | |
113 | static int copy_text_and_data (int); | |
114 | static int copy_sym (int, int, char *, char *); | |
115 | static void write_segment (int, char *, char *); | |
4e3a36cd JB |
116 | \f |
117 | /* **************************************************************** | |
118 | * unexec | |
119 | * | |
120 | * driving logic. | |
121 | */ | |
dd5ecd6b | 122 | int unexec (const char *new_name, const char *a_name) |
76998edb | 123 | { |
0248680a | 124 | int new = -1, a_out = -1; |
4e3a36cd | 125 | |
0248680a | 126 | if (a_name && (a_out = open (a_name, O_RDONLY)) < 0) |
4e3a36cd JB |
127 | { |
128 | PERROR (a_name); | |
129 | } | |
130 | if ((new = creat (new_name, 0666)) < 0) | |
131 | { | |
132 | PERROR (new_name); | |
133 | } | |
0248680a | 134 | if (make_hdr (new, a_out, |
0248680a | 135 | a_name, new_name) < 0 |
4e3a36cd JB |
136 | || copy_text_and_data (new) < 0 |
137 | || copy_sym (new, a_out, a_name, new_name) < 0 | |
4e3a36cd | 138 | || adjust_lnnoptrs (new, a_out, new_name) < 0 |
0248680a | 139 | || unrelocate_symbols (new, a_out, a_name, new_name) < 0) |
76998edb | 140 | { |
4e3a36cd | 141 | close (new); |
177c0ea7 | 142 | return -1; |
76998edb | 143 | } |
76998edb | 144 | |
4e3a36cd JB |
145 | close (new); |
146 | if (a_out >= 0) | |
147 | close (a_out); | |
148 | mark_x (new_name); | |
149 | return 0; | |
150 | } | |
151 | ||
152 | /* **************************************************************** | |
153 | * make_hdr | |
154 | * | |
155 | * Make the header in the new a.out from the header in core. | |
156 | * Modify the text and data sizes. | |
157 | */ | |
158 | static int | |
0248680a | 159 | make_hdr (int new, int a_out, |
0248680a | 160 | char *a_name, char *new_name) |
4e3a36cd | 161 | { |
0248680a | 162 | int scns; |
dd5ecd6b DN |
163 | unsigned int bss_start; |
164 | unsigned int data_start; | |
4e3a36cd JB |
165 | |
166 | struct scnhdr section[MAX_SECTIONS]; | |
167 | struct scnhdr * f_thdr; /* Text section header */ | |
168 | struct scnhdr * f_dhdr; /* Data section header */ | |
169 | struct scnhdr * f_bhdr; /* Bss section header */ | |
170 | struct scnhdr * f_lhdr; /* Loader section header */ | |
171 | struct scnhdr * f_tchdr; /* Typechk section header */ | |
172 | struct scnhdr * f_dbhdr; /* Debug section header */ | |
173 | struct scnhdr * f_xhdr; /* Except section header */ | |
174 | ||
175 | load_scnptr = orig_load_scnptr = lnnoptr = 0; | |
176 | pagemask = getpagesize () - 1; | |
177 | ||
178 | /* Adjust text/data boundary. */ | |
4e3a36cd | 179 | data_start = (long) start_of_data (); |
4e3a36cd JB |
180 | data_start = ADDR_CORRECT (data_start); |
181 | ||
4e3a36cd | 182 | data_start = data_start & ~pagemask; /* (Down) to page boundary. */ |
4e3a36cd | 183 | |
dd5ecd6b DN |
184 | bss_start = ADDR_CORRECT (sbrk (0)) + pagemask; |
185 | bss_start &= ~ pagemask; | |
76998edb | 186 | |
4e3a36cd JB |
187 | if (data_start > bss_start) /* Can't have negative data size. */ |
188 | { | |
189 | ERROR2 ("unexec: data_start (%u) can't be greater than bss_start (%u)", | |
190 | data_start, bss_start); | |
191 | } | |
76998edb | 192 | |
4e3a36cd | 193 | /* Salvage as much info from the existing file as possible */ |
4e3a36cd JB |
194 | f_thdr = NULL; f_dhdr = NULL; f_bhdr = NULL; |
195 | f_lhdr = NULL; f_tchdr = NULL; f_dbhdr = NULL; f_xhdr = NULL; | |
196 | if (a_out >= 0) | |
76998edb | 197 | { |
4e3a36cd JB |
198 | if (read (a_out, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) |
199 | { | |
200 | PERROR (a_name); | |
201 | } | |
4e3a36cd JB |
202 | if (f_hdr.f_opthdr > 0) |
203 | { | |
204 | if (read (a_out, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) | |
205 | { | |
206 | PERROR (a_name); | |
207 | } | |
4e3a36cd JB |
208 | } |
209 | if (f_hdr.f_nscns > MAX_SECTIONS) | |
210 | { | |
211 | ERROR0 ("unexec: too many section headers -- increase MAX_SECTIONS"); | |
212 | } | |
213 | /* Loop through section headers */ | |
214 | for (scns = 0; scns < f_hdr.f_nscns; scns++) { | |
215 | struct scnhdr *s = §ion[scns]; | |
216 | if (read (a_out, s, sizeof (*s)) != sizeof (*s)) | |
217 | { | |
218 | PERROR (a_name); | |
219 | } | |
4e3a36cd JB |
220 | |
221 | #define CHECK_SCNHDR(ptr, name, flags) \ | |
222 | if (strcmp(s->s_name, name) == 0) { \ | |
223 | if (s->s_flags != flags) { \ | |
d63c1903 KH |
224 | fprintf(stderr, "unexec: %lx flags where %x expected in %s section.\n", \ |
225 | (unsigned long)s->s_flags, flags, name); \ | |
4e3a36cd JB |
226 | } \ |
227 | if (ptr) { \ | |
228 | fprintf(stderr, "unexec: duplicate section header for section %s.\n", \ | |
229 | name); \ | |
230 | } \ | |
231 | ptr = s; \ | |
232 | } | |
233 | CHECK_SCNHDR(f_thdr, _TEXT, STYP_TEXT); | |
234 | CHECK_SCNHDR(f_dhdr, _DATA, STYP_DATA); | |
235 | CHECK_SCNHDR(f_bhdr, _BSS, STYP_BSS); | |
236 | CHECK_SCNHDR(f_lhdr, _LOADER, STYP_LOADER); | |
237 | CHECK_SCNHDR(f_dbhdr, _DEBUG, STYP_DEBUG); | |
238 | CHECK_SCNHDR(f_tchdr, _TYPCHK, STYP_TYPCHK); | |
239 | CHECK_SCNHDR(f_xhdr, _EXCEPT, STYP_EXCEPT); | |
240 | } | |
241 | ||
242 | if (f_thdr == 0) | |
243 | { | |
0248680a | 244 | ERROR1 ("unexec: couldn't find \"%s\" section", (int) _TEXT); |
4e3a36cd JB |
245 | } |
246 | if (f_dhdr == 0) | |
247 | { | |
0248680a | 248 | ERROR1 ("unexec: couldn't find \"%s\" section", (int) _DATA); |
4e3a36cd JB |
249 | } |
250 | if (f_bhdr == 0) | |
251 | { | |
0248680a | 252 | ERROR1 ("unexec: couldn't find \"%s\" section", (int) _BSS); |
4e3a36cd | 253 | } |
76998edb | 254 | } |
4e3a36cd | 255 | else |
76998edb | 256 | { |
4e3a36cd | 257 | ERROR0 ("can't build a COFF file from scratch yet"); |
76998edb | 258 | } |
4e3a36cd JB |
259 | orig_data_scnptr = f_dhdr->s_scnptr; |
260 | orig_load_scnptr = f_lhdr ? f_lhdr->s_scnptr : 0; | |
261 | ||
262 | /* Now we alter the contents of all the f_*hdr variables | |
263 | to correspond to what we want to dump. */ | |
4a438fc5 RS |
264 | |
265 | /* Indicate that the reloc information is no longer valid for ld (bind); | |
266 | we only update it enough to fake out the exec-time loader. */ | |
267 | f_hdr.f_flags |= (F_RELFLG | F_EXEC); | |
268 | ||
0248680a | 269 | f_ohdr.dsize = bss_start - f_ohdr.data_start; |
dd5ecd6b | 270 | f_ohdr.bsize = 0; |
4e3a36cd JB |
271 | |
272 | f_dhdr->s_size = f_ohdr.dsize; | |
273 | f_bhdr->s_size = f_ohdr.bsize; | |
4a438fc5 RS |
274 | f_bhdr->s_paddr = f_ohdr.data_start + f_ohdr.dsize; |
275 | f_bhdr->s_vaddr = f_ohdr.data_start + f_ohdr.dsize; | |
4e3a36cd JB |
276 | |
277 | /* fix scnptr's */ | |
278 | { | |
4a438fc5 | 279 | ulong ptr = section[0].s_scnptr; |
4e3a36cd | 280 | |
4a438fc5 RS |
281 | bias = -1; |
282 | for (scns = 0; scns < f_hdr.f_nscns; scns++) | |
283 | { | |
284 | struct scnhdr *s = §ion[scns]; | |
4e3a36cd | 285 | |
4a438fc5 RS |
286 | if (s->s_flags & STYP_PAD) /* .pad sections omitted in AIX 4.1 */ |
287 | { | |
288 | /* | |
289 | * the text_start should probably be o_algntext but that doesn't | |
290 | * seem to change | |
291 | */ | |
292 | if (f_ohdr.text_start != 0) /* && scns != 0 */ | |
293 | { | |
294 | s->s_size = 512 - (ptr % 512); | |
295 | if (s->s_size == 512) | |
296 | s->s_size = 0; | |
297 | } | |
298 | s->s_scnptr = ptr; | |
299 | } | |
300 | else if (s->s_flags & STYP_DATA) | |
4e3a36cd | 301 | s->s_scnptr = ptr; |
4a438fc5 RS |
302 | else if (!(s->s_flags & (STYP_TEXT | STYP_BSS))) |
303 | { | |
304 | if (bias == -1) /* if first section after bss */ | |
305 | bias = ptr - s->s_scnptr; | |
4e3a36cd | 306 | |
4a438fc5 RS |
307 | s->s_scnptr += bias; |
308 | ptr = s->s_scnptr; | |
309 | } | |
177c0ea7 | 310 | |
4a438fc5 RS |
311 | ptr = ptr + s->s_size; |
312 | } | |
4e3a36cd JB |
313 | } |
314 | ||
315 | /* fix other pointers */ | |
4a438fc5 RS |
316 | for (scns = 0; scns < f_hdr.f_nscns; scns++) |
317 | { | |
318 | struct scnhdr *s = §ion[scns]; | |
4e3a36cd | 319 | |
4a438fc5 RS |
320 | if (s->s_relptr != 0) |
321 | { | |
322 | s->s_relptr += bias; | |
323 | } | |
324 | if (s->s_lnnoptr != 0) | |
325 | { | |
326 | if (lnnoptr == 0) lnnoptr = s->s_lnnoptr; | |
327 | s->s_lnnoptr += bias; | |
328 | } | |
329 | } | |
4e3a36cd JB |
330 | |
331 | if (f_hdr.f_symptr > 0L) | |
76998edb | 332 | { |
4e3a36cd | 333 | f_hdr.f_symptr += bias; |
76998edb JB |
334 | } |
335 | ||
4e3a36cd JB |
336 | text_scnptr = f_thdr->s_scnptr; |
337 | data_scnptr = f_dhdr->s_scnptr; | |
338 | load_scnptr = f_lhdr ? f_lhdr->s_scnptr : 0; | |
76998edb | 339 | |
4e3a36cd JB |
340 | if (write (new, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) |
341 | { | |
342 | PERROR (new_name); | |
343 | } | |
76998edb | 344 | |
4e3a36cd JB |
345 | if (f_hdr.f_opthdr > 0) |
346 | { | |
347 | if (write (new, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) | |
76998edb | 348 | { |
4e3a36cd JB |
349 | PERROR (new_name); |
350 | } | |
351 | } | |
76998edb | 352 | |
4e3a36cd JB |
353 | for (scns = 0; scns < f_hdr.f_nscns; scns++) { |
354 | struct scnhdr *s = §ion[scns]; | |
355 | if (write (new, s, sizeof (*s)) != sizeof (*s)) | |
356 | { | |
357 | PERROR (new_name); | |
358 | } | |
359 | } | |
76998edb | 360 | |
4e3a36cd | 361 | return (0); |
4e3a36cd JB |
362 | } |
363 | \f | |
364 | /* **************************************************************** | |
177c0ea7 | 365 | |
4e3a36cd JB |
366 | * |
367 | * Copy the text and data segments from memory to the new a.out | |
368 | */ | |
369 | static int | |
0248680a | 370 | copy_text_and_data (int new) |
4e3a36cd | 371 | { |
0248680a DL |
372 | char *end; |
373 | char *ptr; | |
4e3a36cd | 374 | |
0248680a | 375 | lseek (new, (long) text_scnptr, SEEK_SET); |
4e3a36cd JB |
376 | ptr = start_of_text () + text_scnptr; |
377 | end = ptr + f_ohdr.tsize; | |
378 | write_segment (new, ptr, end); | |
379 | ||
0248680a DL |
380 | lseek (new, (long) data_scnptr, SEEK_SET); |
381 | ptr = (char *) f_ohdr.data_start; | |
4e3a36cd JB |
382 | end = ptr + f_ohdr.dsize; |
383 | write_segment (new, ptr, end); | |
384 | ||
385 | return 0; | |
386 | } | |
387 | ||
91b97ddb | 388 | #define UnexBlockSz (1<<12) /* read/write block size */ |
0248680a DL |
389 | static void |
390 | write_segment (int new, char *ptr, char *end) | |
4e3a36cd | 391 | { |
0248680a | 392 | int i, nwrite, ret; |
4e3a36cd | 393 | char buf[80]; |
91b97ddb | 394 | char zeros[UnexBlockSz]; |
4e3a36cd JB |
395 | |
396 | for (i = 0; ptr < end;) | |
397 | { | |
91b97ddb RS |
398 | /* distance to next block. */ |
399 | nwrite = (((int) ptr + UnexBlockSz) & -UnexBlockSz) - (int) ptr; | |
4e3a36cd JB |
400 | /* But not beyond specified end. */ |
401 | if (nwrite > end - ptr) nwrite = end - ptr; | |
402 | ret = write (new, ptr, nwrite); | |
403 | /* If write gets a page fault, it means we reached | |
404 | a gap between the old text segment and the old data segment. | |
405 | This gap has probably been remapped into part of the text segment. | |
406 | So write zeros for it. */ | |
407 | if (ret == -1 && errno == EFAULT) | |
76998edb | 408 | { |
0248680a | 409 | memset (zeros, 0, nwrite); |
91b97ddb | 410 | write (new, zeros, nwrite); |
76998edb | 411 | } |
4e3a36cd | 412 | else if (nwrite != ret) |
76998edb | 413 | { |
4e3a36cd | 414 | sprintf (buf, |
d63c1903 KH |
415 | "unexec write failure: addr 0x%lx, fileno %d, size 0x%x, wrote 0x%x, errno %d", |
416 | (unsigned long)ptr, new, nwrite, ret, errno); | |
4e3a36cd | 417 | PERROR (buf); |
76998edb | 418 | } |
4e3a36cd JB |
419 | i += nwrite; |
420 | ptr += nwrite; | |
421 | } | |
422 | } | |
423 | \f | |
424 | /* **************************************************************** | |
425 | * copy_sym | |
426 | * | |
427 | * Copy the relocation information and symbol table from the a.out to the new | |
428 | */ | |
429 | static int | |
0248680a | 430 | copy_sym (int new, int a_out, char *a_name, char *new_name) |
4e3a36cd | 431 | { |
91b97ddb | 432 | char page[UnexBlockSz]; |
4e3a36cd | 433 | int n; |
76998edb | 434 | |
4e3a36cd JB |
435 | if (a_out < 0) |
436 | return 0; | |
76998edb | 437 | |
4a438fc5 | 438 | if (orig_load_scnptr == 0L) |
4e3a36cd | 439 | return 0; |
76998edb | 440 | |
4a438fc5 | 441 | if (lnnoptr && lnnoptr < orig_load_scnptr) /* if there is line number info */ |
0248680a | 442 | lseek (a_out, lnnoptr, SEEK_SET); /* start copying from there */ |
4e3a36cd | 443 | else |
0248680a | 444 | lseek (a_out, orig_load_scnptr, SEEK_SET); /* Position a.out to symtab. */ |
4e3a36cd JB |
445 | |
446 | while ((n = read (a_out, page, sizeof page)) > 0) | |
447 | { | |
448 | if (write (new, page, n) != n) | |
76998edb | 449 | { |
4e3a36cd | 450 | PERROR (new_name); |
76998edb JB |
451 | } |
452 | } | |
4e3a36cd JB |
453 | if (n < 0) |
454 | { | |
455 | PERROR (a_name); | |
456 | } | |
457 | return 0; | |
458 | } | |
459 | \f | |
460 | /* **************************************************************** | |
461 | * mark_x | |
462 | * | |
eb8c3be9 | 463 | * After successfully building the new a.out, mark it executable |
4e3a36cd JB |
464 | */ |
465 | static void | |
0248680a | 466 | mark_x (char *name) |
4e3a36cd JB |
467 | { |
468 | struct stat sbuf; | |
469 | int um; | |
470 | int new = 0; /* for PERROR */ | |
76998edb | 471 | |
4e3a36cd JB |
472 | um = umask (777); |
473 | umask (um); | |
474 | if (stat (name, &sbuf) == -1) | |
475 | { | |
476 | PERROR (name); | |
477 | } | |
478 | sbuf.st_mode |= 0111 & ~um; | |
479 | if (chmod (name, sbuf.st_mode) == -1) | |
480 | PERROR (name); | |
481 | } | |
482 | \f | |
0248680a DL |
483 | static int |
484 | adjust_lnnoptrs (int writedesc, int readdesc, char *new_name) | |
4e3a36cd | 485 | { |
0248680a DL |
486 | int nsyms; |
487 | int naux; | |
488 | int new; | |
4e3a36cd JB |
489 | struct syment symentry; |
490 | union auxent auxentry; | |
4e3a36cd JB |
491 | |
492 | if (!lnnoptr || !f_hdr.f_symptr) | |
493 | return 0; | |
494 | ||
0248680a | 495 | if ((new = open (new_name, O_RDWR)) < 0) |
4e3a36cd JB |
496 | { |
497 | PERROR (new_name); | |
498 | return -1; | |
499 | } | |
500 | ||
0248680a | 501 | lseek (new, f_hdr.f_symptr, SEEK_SET); |
4e3a36cd JB |
502 | for (nsyms = 0; nsyms < f_hdr.f_nsyms; nsyms++) |
503 | { | |
504 | read (new, &symentry, SYMESZ); | |
91b97ddb RS |
505 | if (symentry.n_sclass == C_BINCL || symentry.n_sclass == C_EINCL) |
506 | { | |
507 | symentry.n_value += bias; | |
0248680a | 508 | lseek (new, -SYMESZ, SEEK_CUR); |
91b97ddb RS |
509 | write (new, &symentry, SYMESZ); |
510 | } | |
511 | ||
4a438fc5 | 512 | for (naux = symentry.n_numaux; naux-- != 0; ) |
4e3a36cd JB |
513 | { |
514 | read (new, &auxentry, AUXESZ); | |
515 | nsyms++; | |
4a438fc5 RS |
516 | if (naux != 0 /* skip csect auxentry (last entry) */ |
517 | && (symentry.n_sclass == C_EXT || symentry.n_sclass == C_HIDEXT)) | |
518 | { | |
519 | auxentry.x_sym.x_fcnary.x_fcn.x_lnnoptr += bias; | |
0248680a | 520 | lseek (new, -AUXESZ, SEEK_CUR); |
4a438fc5 RS |
521 | write (new, &auxentry, AUXESZ); |
522 | } | |
4e3a36cd JB |
523 | } |
524 | } | |
525 | close (new); | |
76998edb | 526 | |
0248680a DL |
527 | return 0; |
528 | } | |
4e3a36cd | 529 | |
0248680a DL |
530 | static int |
531 | unrelocate_symbols (int new, int a_out, char *a_name, char *new_name) | |
76998edb | 532 | { |
0248680a | 533 | int i; |
4e3a36cd | 534 | LDHDR ldhdr; |
0248680a | 535 | LDREL ldrel; |
4a438fc5 | 536 | ulong t_reloc = (ulong) &_text - f_ohdr.text_start; |
0248680a DL |
537 | #ifndef ALIGN_DATA_RELOC |
538 | ulong d_reloc = (ulong) &_data - f_ohdr.data_start; | |
539 | #else | |
177c0ea7 | 540 | /* This worked (and was needed) before AIX 4.2. |
0248680a | 541 | I have no idea why. -- Mike */ |
4a438fc5 | 542 | ulong d_reloc = (ulong) &_data - ALIGN(f_ohdr.data_start, 2); |
0248680a | 543 | #endif |
4e3a36cd | 544 | int * p; |
4e3a36cd JB |
545 | |
546 | if (load_scnptr == 0) | |
547 | return 0; | |
548 | ||
0248680a | 549 | lseek (a_out, orig_load_scnptr, SEEK_SET); |
4e3a36cd JB |
550 | if (read (a_out, &ldhdr, sizeof (ldhdr)) != sizeof (ldhdr)) |
551 | { | |
552 | PERROR (new_name); | |
553 | } | |
554 | ||
555 | #define SYMNDX_TEXT 0 | |
556 | #define SYMNDX_DATA 1 | |
557 | #define SYMNDX_BSS 2 | |
4e3a36cd | 558 | |
0248680a DL |
559 | for (i = 0; i < ldhdr.l_nreloc; i++) |
560 | { | |
561 | lseek (a_out, | |
562 | orig_load_scnptr + LDHDRSZ + LDSYMSZ*ldhdr.l_nsyms + LDRELSZ*i, | |
563 | SEEK_SET); | |
4e3a36cd | 564 | |
0248680a DL |
565 | if (read (a_out, &ldrel, LDRELSZ) != LDRELSZ) |
566 | { | |
567 | PERROR (a_name); | |
568 | } | |
4e3a36cd JB |
569 | |
570 | /* move the BSS loader symbols to the DATA segment */ | |
0248680a | 571 | if (ldrel.l_symndx == SYMNDX_BSS) |
4e3a36cd | 572 | { |
0248680a | 573 | ldrel.l_symndx = SYMNDX_DATA; |
91b97ddb | 574 | |
4e3a36cd JB |
575 | lseek (new, |
576 | load_scnptr + LDHDRSZ + LDSYMSZ*ldhdr.l_nsyms + LDRELSZ*i, | |
0248680a | 577 | SEEK_SET); |
4e3a36cd | 578 | |
0248680a | 579 | if (write (new, &ldrel, LDRELSZ) != LDRELSZ) |
4e3a36cd JB |
580 | { |
581 | PERROR (new_name); | |
582 | } | |
583 | } | |
584 | ||
0248680a | 585 | if (ldrel.l_rsecnm == f_ohdr.o_sndata) |
4e3a36cd JB |
586 | { |
587 | int orig_int; | |
588 | ||
4a438fc5 | 589 | lseek (a_out, |
0248680a DL |
590 | orig_data_scnptr + (ldrel.l_vaddr - f_ohdr.data_start), |
591 | SEEK_SET); | |
4e3a36cd | 592 | |
0248680a DL |
593 | if (read (a_out, (void *) &orig_int, sizeof (orig_int)) |
594 | != sizeof (orig_int)) | |
4e3a36cd JB |
595 | { |
596 | PERROR (a_name); | |
597 | } | |
598 | ||
0248680a | 599 | p = (int *) (ldrel.l_vaddr + d_reloc); |
4a438fc5 | 600 | |
0248680a | 601 | switch (ldrel.l_symndx) { |
4e3a36cd | 602 | case SYMNDX_TEXT: |
4a438fc5 | 603 | orig_int = * p - t_reloc; |
4e3a36cd JB |
604 | break; |
605 | ||
606 | case SYMNDX_DATA: | |
607 | case SYMNDX_BSS: | |
4a438fc5 | 608 | orig_int = * p - d_reloc; |
4e3a36cd JB |
609 | break; |
610 | } | |
611 | ||
4a438fc5 RS |
612 | if (orig_int != * p) |
613 | { | |
614 | lseek (new, | |
0248680a DL |
615 | data_scnptr + (ldrel.l_vaddr - f_ohdr.data_start), |
616 | SEEK_SET); | |
4a438fc5 RS |
617 | if (write (new, (void *) &orig_int, sizeof (orig_int)) |
618 | != sizeof (orig_int)) | |
619 | { | |
620 | PERROR (new_name); | |
621 | } | |
622 | } | |
4e3a36cd JB |
623 | } |
624 | } | |
0248680a | 625 | return 0; |
76998edb | 626 | } |
ab5796a9 | 627 | |
313d9eb2 DN |
628 | /* |
629 | * Return the address of the start of the text segment prior to | |
630 | * doing an unexec. After unexec the return value is undefined. | |
631 | * See crt0.c for further explanation and _start. | |
632 | * | |
633 | */ | |
634 | ||
635 | char * | |
636 | start_of_text (void) | |
637 | { | |
638 | return ((char *) 0x10000000); | |
639 | } | |
640 |