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 | ||
35b3a27e PE |
62 | char *start_of_text (void); /* Start of text */ |
63 | ||
64 | extern int _data; | |
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) */ | |
35b3a27e PE |
74 | static long bias; /* Bias to add for growth */ |
75 | static long lnnoptr; /* Pointer to line-number info within file */ | |
4e3a36cd | 76 | |
35b3a27e PE |
77 | static long text_scnptr; |
78 | static long data_scnptr; | |
4a438fc5 | 79 | #define ALIGN(val, pwr) (((val) + ((1L<<(pwr))-1)) & ~((1L<<(pwr))-1)) |
35b3a27e PE |
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 | |
35b3a27e | 95 | static void |
dc44c39a | 96 | report_error (const char *file, int fd) |
4e3a36cd JB |
97 | { |
98 | if (fd) | |
35b3a27e | 99 | close (fd); |
8eca17c9 | 100 | report_file_error ("Cannot unexec", Fcons (build_string (file), Qnil)); |
4e3a36cd | 101 | } |
76998edb | 102 | |
35b3a27e PE |
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 | |
35b3a27e PE |
107 | #undef ADDR_CORRECT |
108 | #define ADDR_CORRECT(x) ((int)(x)) | |
109 | ||
110 | static void | |
111 | report_error_1 (int fd, const char *msg, int a1, int a2) | |
76998edb | 112 | { |
4e3a36cd | 113 | close (fd); |
35b3a27e | 114 | error (msg, a1, a2); |
4e3a36cd JB |
115 | } |
116 | ||
dc44c39a PE |
117 | static int make_hdr (int, int, const char *, const char *); |
118 | static void mark_x (const char *); | |
0248680a | 119 | static int copy_text_and_data (int); |
dc44c39a | 120 | static int copy_sym (int, int, const char *, const char *); |
0248680a | 121 | static void write_segment (int, char *, char *); |
4e3a36cd JB |
122 | \f |
123 | /* **************************************************************** | |
124 | * unexec | |
125 | * | |
126 | * driving logic. | |
127 | */ | |
381259ef PE |
128 | void |
129 | unexec (const char *new_name, const char *a_name) | |
76998edb | 130 | { |
0248680a | 131 | int new = -1, a_out = -1; |
4e3a36cd | 132 | |
0248680a | 133 | if (a_name && (a_out = open (a_name, O_RDONLY)) < 0) |
4e3a36cd JB |
134 | { |
135 | PERROR (a_name); | |
136 | } | |
137 | if ((new = creat (new_name, 0666)) < 0) | |
138 | { | |
139 | PERROR (new_name); | |
140 | } | |
0248680a | 141 | if (make_hdr (new, a_out, |
0248680a | 142 | a_name, new_name) < 0 |
4e3a36cd JB |
143 | || copy_text_and_data (new) < 0 |
144 | || copy_sym (new, a_out, a_name, new_name) < 0 | |
4e3a36cd | 145 | || adjust_lnnoptrs (new, a_out, new_name) < 0 |
0248680a | 146 | || unrelocate_symbols (new, a_out, a_name, new_name) < 0) |
76998edb | 147 | { |
4e3a36cd | 148 | close (new); |
fffe2e14 | 149 | return; |
76998edb | 150 | } |
76998edb | 151 | |
4e3a36cd JB |
152 | close (new); |
153 | if (a_out >= 0) | |
154 | close (a_out); | |
155 | mark_x (new_name); | |
4e3a36cd JB |
156 | } |
157 | ||
158 | /* **************************************************************** | |
159 | * make_hdr | |
160 | * | |
161 | * Make the header in the new a.out from the header in core. | |
162 | * Modify the text and data sizes. | |
163 | */ | |
164 | static int | |
0248680a | 165 | make_hdr (int new, int a_out, |
dc44c39a | 166 | const char *a_name, const char *new_name) |
4e3a36cd | 167 | { |
0248680a | 168 | int scns; |
35b3a27e PE |
169 | unsigned int bss_start; |
170 | unsigned int data_start; | |
4e3a36cd JB |
171 | |
172 | struct scnhdr section[MAX_SECTIONS]; | |
173 | struct scnhdr * f_thdr; /* Text section header */ | |
174 | struct scnhdr * f_dhdr; /* Data section header */ | |
175 | struct scnhdr * f_bhdr; /* Bss section header */ | |
176 | struct scnhdr * f_lhdr; /* Loader section header */ | |
177 | struct scnhdr * f_tchdr; /* Typechk section header */ | |
178 | struct scnhdr * f_dbhdr; /* Debug section header */ | |
179 | struct scnhdr * f_xhdr; /* Except section header */ | |
180 | ||
181 | load_scnptr = orig_load_scnptr = lnnoptr = 0; | |
182 | pagemask = getpagesize () - 1; | |
183 | ||
184 | /* Adjust text/data boundary. */ | |
35b3a27e PE |
185 | data_start = (long) start_of_data (); |
186 | data_start = ADDR_CORRECT (data_start); | |
4e3a36cd | 187 | |
4e3a36cd | 188 | data_start = data_start & ~pagemask; /* (Down) to page boundary. */ |
4e3a36cd | 189 | |
35b3a27e | 190 | bss_start = ADDR_CORRECT (sbrk (0)) + pagemask; |
dd5ecd6b | 191 | bss_start &= ~ pagemask; |
76998edb | 192 | |
4e3a36cd JB |
193 | if (data_start > bss_start) /* Can't have negative data size. */ |
194 | { | |
35b3a27e | 195 | ERROR2 ("unexec: data_start (%u) can't be greater than bss_start (%u)", |
4e3a36cd JB |
196 | data_start, bss_start); |
197 | } | |
76998edb | 198 | |
4e3a36cd | 199 | /* Salvage as much info from the existing file as possible */ |
4e3a36cd JB |
200 | f_thdr = NULL; f_dhdr = NULL; f_bhdr = NULL; |
201 | f_lhdr = NULL; f_tchdr = NULL; f_dbhdr = NULL; f_xhdr = NULL; | |
202 | if (a_out >= 0) | |
76998edb | 203 | { |
4e3a36cd JB |
204 | if (read (a_out, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) |
205 | { | |
206 | PERROR (a_name); | |
207 | } | |
4e3a36cd JB |
208 | if (f_hdr.f_opthdr > 0) |
209 | { | |
210 | if (read (a_out, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) | |
211 | { | |
212 | PERROR (a_name); | |
213 | } | |
4e3a36cd JB |
214 | } |
215 | if (f_hdr.f_nscns > MAX_SECTIONS) | |
216 | { | |
217 | ERROR0 ("unexec: too many section headers -- increase MAX_SECTIONS"); | |
218 | } | |
219 | /* Loop through section headers */ | |
220 | for (scns = 0; scns < f_hdr.f_nscns; scns++) { | |
221 | struct scnhdr *s = §ion[scns]; | |
222 | if (read (a_out, s, sizeof (*s)) != sizeof (*s)) | |
223 | { | |
224 | PERROR (a_name); | |
225 | } | |
4e3a36cd JB |
226 | |
227 | #define CHECK_SCNHDR(ptr, name, flags) \ | |
5e617bc2 | 228 | if (strcmp (s->s_name, name) == 0) { \ |
4e3a36cd | 229 | if (s->s_flags != flags) { \ |
5e617bc2 JB |
230 | fprintf (stderr, "unexec: %lx flags where %x expected in %s section.\n", \ |
231 | (unsigned long)s->s_flags, flags, name); \ | |
4e3a36cd JB |
232 | } \ |
233 | if (ptr) { \ | |
5e617bc2 JB |
234 | fprintf (stderr, "unexec: duplicate section header for section %s.\n", \ |
235 | name); \ | |
4e3a36cd JB |
236 | } \ |
237 | ptr = s; \ | |
238 | } | |
5e617bc2 JB |
239 | CHECK_SCNHDR (f_thdr, _TEXT, STYP_TEXT); |
240 | CHECK_SCNHDR (f_dhdr, _DATA, STYP_DATA); | |
241 | CHECK_SCNHDR (f_bhdr, _BSS, STYP_BSS); | |
242 | CHECK_SCNHDR (f_lhdr, _LOADER, STYP_LOADER); | |
243 | CHECK_SCNHDR (f_dbhdr, _DEBUG, STYP_DEBUG); | |
244 | CHECK_SCNHDR (f_tchdr, _TYPCHK, STYP_TYPCHK); | |
245 | CHECK_SCNHDR (f_xhdr, _EXCEPT, STYP_EXCEPT); | |
4e3a36cd JB |
246 | } |
247 | ||
248 | if (f_thdr == 0) | |
249 | { | |
0248680a | 250 | ERROR1 ("unexec: couldn't find \"%s\" section", (int) _TEXT); |
4e3a36cd JB |
251 | } |
252 | if (f_dhdr == 0) | |
253 | { | |
0248680a | 254 | ERROR1 ("unexec: couldn't find \"%s\" section", (int) _DATA); |
4e3a36cd JB |
255 | } |
256 | if (f_bhdr == 0) | |
257 | { | |
0248680a | 258 | ERROR1 ("unexec: couldn't find \"%s\" section", (int) _BSS); |
4e3a36cd | 259 | } |
76998edb | 260 | } |
4e3a36cd | 261 | else |
76998edb | 262 | { |
4e3a36cd | 263 | ERROR0 ("can't build a COFF file from scratch yet"); |
76998edb | 264 | } |
4e3a36cd JB |
265 | orig_data_scnptr = f_dhdr->s_scnptr; |
266 | orig_load_scnptr = f_lhdr ? f_lhdr->s_scnptr : 0; | |
267 | ||
268 | /* Now we alter the contents of all the f_*hdr variables | |
269 | to correspond to what we want to dump. */ | |
4a438fc5 RS |
270 | |
271 | /* Indicate that the reloc information is no longer valid for ld (bind); | |
272 | we only update it enough to fake out the exec-time loader. */ | |
273 | f_hdr.f_flags |= (F_RELFLG | F_EXEC); | |
274 | ||
0248680a | 275 | f_ohdr.dsize = bss_start - f_ohdr.data_start; |
dd5ecd6b | 276 | f_ohdr.bsize = 0; |
4e3a36cd JB |
277 | |
278 | f_dhdr->s_size = f_ohdr.dsize; | |
279 | f_bhdr->s_size = f_ohdr.bsize; | |
4a438fc5 RS |
280 | f_bhdr->s_paddr = f_ohdr.data_start + f_ohdr.dsize; |
281 | f_bhdr->s_vaddr = f_ohdr.data_start + f_ohdr.dsize; | |
4e3a36cd JB |
282 | |
283 | /* fix scnptr's */ | |
284 | { | |
35b3a27e | 285 | ulong ptr = section[0].s_scnptr; |
4e3a36cd | 286 | |
4a438fc5 RS |
287 | bias = -1; |
288 | for (scns = 0; scns < f_hdr.f_nscns; scns++) | |
289 | { | |
290 | struct scnhdr *s = §ion[scns]; | |
4e3a36cd | 291 | |
4a438fc5 RS |
292 | if (s->s_flags & STYP_PAD) /* .pad sections omitted in AIX 4.1 */ |
293 | { | |
294 | /* | |
295 | * the text_start should probably be o_algntext but that doesn't | |
296 | * seem to change | |
297 | */ | |
298 | if (f_ohdr.text_start != 0) /* && scns != 0 */ | |
299 | { | |
300 | s->s_size = 512 - (ptr % 512); | |
301 | if (s->s_size == 512) | |
302 | s->s_size = 0; | |
303 | } | |
304 | s->s_scnptr = ptr; | |
305 | } | |
306 | else if (s->s_flags & STYP_DATA) | |
4e3a36cd | 307 | s->s_scnptr = ptr; |
4a438fc5 RS |
308 | else if (!(s->s_flags & (STYP_TEXT | STYP_BSS))) |
309 | { | |
310 | if (bias == -1) /* if first section after bss */ | |
311 | bias = ptr - s->s_scnptr; | |
4e3a36cd | 312 | |
4a438fc5 RS |
313 | s->s_scnptr += bias; |
314 | ptr = s->s_scnptr; | |
315 | } | |
177c0ea7 | 316 | |
4a438fc5 RS |
317 | ptr = ptr + s->s_size; |
318 | } | |
4e3a36cd JB |
319 | } |
320 | ||
321 | /* fix other pointers */ | |
4a438fc5 RS |
322 | for (scns = 0; scns < f_hdr.f_nscns; scns++) |
323 | { | |
324 | struct scnhdr *s = §ion[scns]; | |
4e3a36cd | 325 | |
4a438fc5 RS |
326 | if (s->s_relptr != 0) |
327 | { | |
328 | s->s_relptr += bias; | |
329 | } | |
330 | if (s->s_lnnoptr != 0) | |
331 | { | |
332 | if (lnnoptr == 0) lnnoptr = s->s_lnnoptr; | |
333 | s->s_lnnoptr += bias; | |
334 | } | |
335 | } | |
4e3a36cd JB |
336 | |
337 | if (f_hdr.f_symptr > 0L) | |
76998edb | 338 | { |
4e3a36cd | 339 | f_hdr.f_symptr += bias; |
76998edb JB |
340 | } |
341 | ||
4e3a36cd JB |
342 | text_scnptr = f_thdr->s_scnptr; |
343 | data_scnptr = f_dhdr->s_scnptr; | |
344 | load_scnptr = f_lhdr ? f_lhdr->s_scnptr : 0; | |
76998edb | 345 | |
4e3a36cd JB |
346 | if (write (new, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) |
347 | { | |
348 | PERROR (new_name); | |
349 | } | |
76998edb | 350 | |
4e3a36cd JB |
351 | if (f_hdr.f_opthdr > 0) |
352 | { | |
353 | if (write (new, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) | |
76998edb | 354 | { |
4e3a36cd JB |
355 | PERROR (new_name); |
356 | } | |
357 | } | |
76998edb | 358 | |
4e3a36cd JB |
359 | for (scns = 0; scns < f_hdr.f_nscns; scns++) { |
360 | struct scnhdr *s = §ion[scns]; | |
361 | if (write (new, s, sizeof (*s)) != sizeof (*s)) | |
362 | { | |
363 | PERROR (new_name); | |
364 | } | |
365 | } | |
76998edb | 366 | |
4e3a36cd | 367 | return (0); |
4e3a36cd JB |
368 | } |
369 | \f | |
370 | /* **************************************************************** | |
177c0ea7 | 371 | |
4e3a36cd JB |
372 | * |
373 | * Copy the text and data segments from memory to the new a.out | |
374 | */ | |
375 | static int | |
0248680a | 376 | copy_text_and_data (int new) |
4e3a36cd | 377 | { |
0248680a DL |
378 | char *end; |
379 | char *ptr; | |
4e3a36cd | 380 | |
35b3a27e PE |
381 | lseek (new, (long) text_scnptr, SEEK_SET); |
382 | ptr = start_of_text () + text_scnptr; | |
4e3a36cd JB |
383 | end = ptr + f_ohdr.tsize; |
384 | write_segment (new, ptr, end); | |
385 | ||
35b3a27e | 386 | lseek (new, (long) data_scnptr, SEEK_SET); |
0248680a | 387 | ptr = (char *) f_ohdr.data_start; |
4e3a36cd JB |
388 | end = ptr + f_ohdr.dsize; |
389 | write_segment (new, ptr, end); | |
390 | ||
391 | return 0; | |
392 | } | |
393 | ||
91b97ddb | 394 | #define UnexBlockSz (1<<12) /* read/write block size */ |
0248680a DL |
395 | static void |
396 | write_segment (int new, char *ptr, char *end) | |
4e3a36cd | 397 | { |
0248680a | 398 | int i, nwrite, ret; |
35b3a27e | 399 | char buf[80]; |
91b97ddb | 400 | char zeros[UnexBlockSz]; |
4e3a36cd JB |
401 | |
402 | for (i = 0; ptr < end;) | |
403 | { | |
91b97ddb RS |
404 | /* distance to next block. */ |
405 | nwrite = (((int) ptr + UnexBlockSz) & -UnexBlockSz) - (int) ptr; | |
4e3a36cd JB |
406 | /* But not beyond specified end. */ |
407 | if (nwrite > end - ptr) nwrite = end - ptr; | |
408 | ret = write (new, ptr, nwrite); | |
409 | /* If write gets a page fault, it means we reached | |
410 | a gap between the old text segment and the old data segment. | |
411 | This gap has probably been remapped into part of the text segment. | |
412 | So write zeros for it. */ | |
413 | if (ret == -1 && errno == EFAULT) | |
76998edb | 414 | { |
0248680a | 415 | memset (zeros, 0, nwrite); |
91b97ddb | 416 | write (new, zeros, nwrite); |
76998edb | 417 | } |
4e3a36cd | 418 | else if (nwrite != ret) |
76998edb | 419 | { |
4e3a36cd | 420 | sprintf (buf, |
35b3a27e PE |
421 | "unexec write failure: addr 0x%lx, fileno %d, size 0x%x, wrote 0x%x, errno %d", |
422 | (unsigned long)ptr, new, nwrite, ret, errno); | |
4e3a36cd | 423 | PERROR (buf); |
76998edb | 424 | } |
4e3a36cd JB |
425 | i += nwrite; |
426 | ptr += nwrite; | |
427 | } | |
428 | } | |
429 | \f | |
430 | /* **************************************************************** | |
431 | * copy_sym | |
432 | * | |
433 | * Copy the relocation information and symbol table from the a.out to the new | |
434 | */ | |
435 | static int | |
dc44c39a | 436 | copy_sym (int new, int a_out, const char *a_name, const char *new_name) |
4e3a36cd | 437 | { |
91b97ddb | 438 | char page[UnexBlockSz]; |
4e3a36cd | 439 | int n; |
76998edb | 440 | |
4e3a36cd JB |
441 | if (a_out < 0) |
442 | return 0; | |
76998edb | 443 | |
4a438fc5 | 444 | if (orig_load_scnptr == 0L) |
4e3a36cd | 445 | return 0; |
76998edb | 446 | |
4a438fc5 | 447 | if (lnnoptr && lnnoptr < orig_load_scnptr) /* if there is line number info */ |
0248680a | 448 | lseek (a_out, lnnoptr, SEEK_SET); /* start copying from there */ |
4e3a36cd | 449 | else |
0248680a | 450 | lseek (a_out, orig_load_scnptr, SEEK_SET); /* Position a.out to symtab. */ |
4e3a36cd JB |
451 | |
452 | while ((n = read (a_out, page, sizeof page)) > 0) | |
453 | { | |
454 | if (write (new, page, n) != n) | |
76998edb | 455 | { |
4e3a36cd | 456 | PERROR (new_name); |
76998edb JB |
457 | } |
458 | } | |
4e3a36cd JB |
459 | if (n < 0) |
460 | { | |
461 | PERROR (a_name); | |
462 | } | |
463 | return 0; | |
464 | } | |
465 | \f | |
466 | /* **************************************************************** | |
467 | * mark_x | |
468 | * | |
eb8c3be9 | 469 | * After successfully building the new a.out, mark it executable |
4e3a36cd JB |
470 | */ |
471 | static void | |
dc44c39a | 472 | mark_x (const char *name) |
4e3a36cd JB |
473 | { |
474 | struct stat sbuf; | |
475 | int um; | |
476 | int new = 0; /* for PERROR */ | |
76998edb | 477 | |
4e3a36cd JB |
478 | um = umask (777); |
479 | umask (um); | |
480 | if (stat (name, &sbuf) == -1) | |
481 | { | |
482 | PERROR (name); | |
483 | } | |
484 | sbuf.st_mode |= 0111 & ~um; | |
485 | if (chmod (name, sbuf.st_mode) == -1) | |
486 | PERROR (name); | |
487 | } | |
488 | \f | |
0248680a | 489 | static int |
dc44c39a | 490 | adjust_lnnoptrs (int writedesc, int readdesc, const char *new_name) |
4e3a36cd | 491 | { |
0248680a DL |
492 | int nsyms; |
493 | int naux; | |
494 | int new; | |
4e3a36cd JB |
495 | struct syment symentry; |
496 | union auxent auxentry; | |
4e3a36cd JB |
497 | |
498 | if (!lnnoptr || !f_hdr.f_symptr) | |
499 | return 0; | |
500 | ||
0248680a | 501 | if ((new = open (new_name, O_RDWR)) < 0) |
4e3a36cd JB |
502 | { |
503 | PERROR (new_name); | |
504 | return -1; | |
505 | } | |
506 | ||
0248680a | 507 | lseek (new, f_hdr.f_symptr, SEEK_SET); |
4e3a36cd JB |
508 | for (nsyms = 0; nsyms < f_hdr.f_nsyms; nsyms++) |
509 | { | |
510 | read (new, &symentry, SYMESZ); | |
91b97ddb RS |
511 | if (symentry.n_sclass == C_BINCL || symentry.n_sclass == C_EINCL) |
512 | { | |
513 | symentry.n_value += bias; | |
0248680a | 514 | lseek (new, -SYMESZ, SEEK_CUR); |
91b97ddb RS |
515 | write (new, &symentry, SYMESZ); |
516 | } | |
517 | ||
4a438fc5 | 518 | for (naux = symentry.n_numaux; naux-- != 0; ) |
4e3a36cd JB |
519 | { |
520 | read (new, &auxentry, AUXESZ); | |
521 | nsyms++; | |
4a438fc5 RS |
522 | if (naux != 0 /* skip csect auxentry (last entry) */ |
523 | && (symentry.n_sclass == C_EXT || symentry.n_sclass == C_HIDEXT)) | |
524 | { | |
525 | auxentry.x_sym.x_fcnary.x_fcn.x_lnnoptr += bias; | |
0248680a | 526 | lseek (new, -AUXESZ, SEEK_CUR); |
4a438fc5 RS |
527 | write (new, &auxentry, AUXESZ); |
528 | } | |
4e3a36cd JB |
529 | } |
530 | } | |
531 | close (new); | |
76998edb | 532 | |
0248680a DL |
533 | return 0; |
534 | } | |
4e3a36cd | 535 | |
0248680a | 536 | static int |
dc44c39a PE |
537 | unrelocate_symbols (int new, int a_out, |
538 | const char *a_name, const char *new_name) | |
76998edb | 539 | { |
0248680a | 540 | int i; |
4e3a36cd | 541 | LDHDR ldhdr; |
0248680a | 542 | LDREL ldrel; |
35b3a27e | 543 | ulong t_reloc = (ulong) &_text - f_ohdr.text_start; |
0248680a | 544 | #ifndef ALIGN_DATA_RELOC |
35b3a27e | 545 | ulong d_reloc = (ulong) &_data - f_ohdr.data_start; |
0248680a | 546 | #else |
177c0ea7 | 547 | /* This worked (and was needed) before AIX 4.2. |
0248680a | 548 | I have no idea why. -- Mike */ |
35b3a27e | 549 | ulong d_reloc = (ulong) &_data - ALIGN (f_ohdr.data_start, 2); |
0248680a | 550 | #endif |
4e3a36cd | 551 | int * p; |
4e3a36cd JB |
552 | |
553 | if (load_scnptr == 0) | |
554 | return 0; | |
555 | ||
0248680a | 556 | lseek (a_out, orig_load_scnptr, SEEK_SET); |
4e3a36cd JB |
557 | if (read (a_out, &ldhdr, sizeof (ldhdr)) != sizeof (ldhdr)) |
558 | { | |
559 | PERROR (new_name); | |
560 | } | |
561 | ||
562 | #define SYMNDX_TEXT 0 | |
563 | #define SYMNDX_DATA 1 | |
564 | #define SYMNDX_BSS 2 | |
4e3a36cd | 565 | |
0248680a DL |
566 | for (i = 0; i < ldhdr.l_nreloc; i++) |
567 | { | |
568 | lseek (a_out, | |
569 | orig_load_scnptr + LDHDRSZ + LDSYMSZ*ldhdr.l_nsyms + LDRELSZ*i, | |
570 | SEEK_SET); | |
4e3a36cd | 571 | |
0248680a DL |
572 | if (read (a_out, &ldrel, LDRELSZ) != LDRELSZ) |
573 | { | |
574 | PERROR (a_name); | |
575 | } | |
4e3a36cd JB |
576 | |
577 | /* move the BSS loader symbols to the DATA segment */ | |
0248680a | 578 | if (ldrel.l_symndx == SYMNDX_BSS) |
4e3a36cd | 579 | { |
0248680a | 580 | ldrel.l_symndx = SYMNDX_DATA; |
91b97ddb | 581 | |
4e3a36cd JB |
582 | lseek (new, |
583 | load_scnptr + LDHDRSZ + LDSYMSZ*ldhdr.l_nsyms + LDRELSZ*i, | |
0248680a | 584 | SEEK_SET); |
4e3a36cd | 585 | |
0248680a | 586 | if (write (new, &ldrel, LDRELSZ) != LDRELSZ) |
4e3a36cd JB |
587 | { |
588 | PERROR (new_name); | |
589 | } | |
590 | } | |
591 | ||
0248680a | 592 | if (ldrel.l_rsecnm == f_ohdr.o_sndata) |
4e3a36cd JB |
593 | { |
594 | int orig_int; | |
595 | ||
4a438fc5 | 596 | lseek (a_out, |
0248680a DL |
597 | orig_data_scnptr + (ldrel.l_vaddr - f_ohdr.data_start), |
598 | SEEK_SET); | |
4e3a36cd | 599 | |
0248680a DL |
600 | if (read (a_out, (void *) &orig_int, sizeof (orig_int)) |
601 | != sizeof (orig_int)) | |
4e3a36cd JB |
602 | { |
603 | PERROR (a_name); | |
604 | } | |
605 | ||
0248680a | 606 | p = (int *) (ldrel.l_vaddr + d_reloc); |
4a438fc5 | 607 | |
0248680a | 608 | switch (ldrel.l_symndx) { |
4e3a36cd | 609 | case SYMNDX_TEXT: |
4a438fc5 | 610 | orig_int = * p - t_reloc; |
4e3a36cd JB |
611 | break; |
612 | ||
613 | case SYMNDX_DATA: | |
614 | case SYMNDX_BSS: | |
4a438fc5 | 615 | orig_int = * p - d_reloc; |
4e3a36cd JB |
616 | break; |
617 | } | |
618 | ||
4a438fc5 RS |
619 | if (orig_int != * p) |
620 | { | |
621 | lseek (new, | |
0248680a DL |
622 | data_scnptr + (ldrel.l_vaddr - f_ohdr.data_start), |
623 | SEEK_SET); | |
4a438fc5 RS |
624 | if (write (new, (void *) &orig_int, sizeof (orig_int)) |
625 | != sizeof (orig_int)) | |
626 | { | |
627 | PERROR (new_name); | |
628 | } | |
629 | } | |
4e3a36cd JB |
630 | } |
631 | } | |
0248680a | 632 | return 0; |
76998edb | 633 | } |
35b3a27e PE |
634 | |
635 | /* | |
636 | * Return the address of the start of the text segment prior to | |
637 | * doing an unexec. After unexec the return value is undefined. | |
638 | * See crt0.c for further explanation and _start. | |
639 | * | |
640 | */ | |
641 | ||
642 | char * | |
643 | start_of_text (void) | |
644 | { | |
645 | return ((char *) 0x10000000); | |
646 | } |