Commit | Line | Data |
---|---|---|
0248680a | 1 | /* Dump an executable image. |
acaf905b | 2 | Copyright (C) 1985-1988, 1999, 2001-2012 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> |
ce701a33 PE |
43 | #include "unexec.h" |
44 | ||
4e3a36cd | 45 | #define PERROR(file) report_error (file, new) |
4e3a36cd JB |
46 | #include <a.out.h> |
47 | /* Define getpagesize () if the system does not. | |
48 | Note that this may depend on symbols defined in a.out.h | |
49 | */ | |
50 | #include "getpagesize.h" | |
76998edb | 51 | |
4e3a36cd | 52 | #include <sys/types.h> |
4e3a36cd JB |
53 | #include <stdio.h> |
54 | #include <sys/stat.h> | |
55 | #include <errno.h> | |
0248680a DL |
56 | #include <unistd.h> |
57 | #include <fcntl.h> | |
4e3a36cd | 58 | |
313d9eb2 | 59 | char *start_of_text (void); /* Start of text */ |
0248680a | 60 | extern char *start_of_data (void); /* Start of initialized data */ |
4e3a36cd JB |
61 | |
62 | extern int _data; | |
4e3a36cd | 63 | extern int _text; |
0248680a | 64 | |
4e3a36cd JB |
65 | #include <filehdr.h> |
66 | #include <aouthdr.h> | |
67 | #include <scnhdr.h> | |
68 | #include <syms.h> | |
0248680a | 69 | |
4e3a36cd JB |
70 | static struct filehdr f_hdr; /* File header */ |
71 | static struct aouthdr f_ohdr; /* Optional file header (a.out) */ | |
0248680a DL |
72 | static long bias; /* Bias to add for growth */ |
73 | static long lnnoptr; /* Pointer to line-number info within file */ | |
4e3a36cd JB |
74 | |
75 | static long text_scnptr; | |
76 | static long data_scnptr; | |
4a438fc5 | 77 | #define ALIGN(val, pwr) (((val) + ((1L<<(pwr))-1)) & ~((1L<<(pwr))-1)) |
4e3a36cd JB |
78 | static long load_scnptr; |
79 | static long orig_load_scnptr; | |
80 | static long orig_data_scnptr; | |
0248680a | 81 | static int unrelocate_symbols (int, int, char *, char *); |
4e3a36cd JB |
82 | |
83 | #ifndef MAX_SECTIONS | |
84 | #define MAX_SECTIONS 10 | |
85 | #endif | |
86 | ||
0248680a | 87 | static int adjust_lnnoptrs (int, int, char *); |
4e3a36cd JB |
88 | |
89 | static int pagemask; | |
90 | ||
d7306fe6 | 91 | #include <setjmp.h> |
8eca17c9 | 92 | #include "lisp.h" |
4e3a36cd | 93 | |
0248680a DL |
94 | static void |
95 | report_error (char *file, int fd) | |
4e3a36cd JB |
96 | { |
97 | if (fd) | |
98 | close (fd); | |
8eca17c9 | 99 | report_file_error ("Cannot unexec", Fcons (build_string (file), Qnil)); |
4e3a36cd | 100 | } |
76998edb | 101 | |
4e3a36cd JB |
102 | #define ERROR0(msg) report_error_1 (new, msg, 0, 0); return -1 |
103 | #define ERROR1(msg,x) report_error_1 (new, msg, x, 0); return -1 | |
104 | #define ERROR2(msg,x,y) report_error_1 (new, msg, x, y); return -1 | |
76998edb | 105 | |
0248680a DL |
106 | static void |
107 | report_error_1 (int fd, char *msg, int a1, int a2) | |
76998edb | 108 | { |
4e3a36cd | 109 | close (fd); |
4e3a36cd | 110 | error (msg, a1, a2); |
4e3a36cd JB |
111 | } |
112 | ||
297834cd | 113 | static int make_hdr (int, int, char *, char *); |
0248680a DL |
114 | static void mark_x (char *); |
115 | static int copy_text_and_data (int); | |
116 | static int copy_sym (int, int, char *, char *); | |
117 | static void write_segment (int, char *, char *); | |
4e3a36cd JB |
118 | \f |
119 | /* **************************************************************** | |
120 | * unexec | |
121 | * | |
122 | * driving logic. | |
123 | */ | |
381259ef PE |
124 | void |
125 | unexec (const char *new_name, const char *a_name) | |
76998edb | 126 | { |
0248680a | 127 | int new = -1, a_out = -1; |
4e3a36cd | 128 | |
0248680a | 129 | if (a_name && (a_out = open (a_name, O_RDONLY)) < 0) |
4e3a36cd JB |
130 | { |
131 | PERROR (a_name); | |
132 | } | |
133 | if ((new = creat (new_name, 0666)) < 0) | |
134 | { | |
135 | PERROR (new_name); | |
136 | } | |
0248680a | 137 | if (make_hdr (new, a_out, |
0248680a | 138 | a_name, new_name) < 0 |
4e3a36cd JB |
139 | || copy_text_and_data (new) < 0 |
140 | || copy_sym (new, a_out, a_name, new_name) < 0 | |
4e3a36cd | 141 | || adjust_lnnoptrs (new, a_out, new_name) < 0 |
0248680a | 142 | || unrelocate_symbols (new, a_out, a_name, new_name) < 0) |
76998edb | 143 | { |
4e3a36cd | 144 | close (new); |
fffe2e14 | 145 | return; |
76998edb | 146 | } |
76998edb | 147 | |
4e3a36cd JB |
148 | close (new); |
149 | if (a_out >= 0) | |
150 | close (a_out); | |
151 | mark_x (new_name); | |
4e3a36cd JB |
152 | } |
153 | ||
154 | /* **************************************************************** | |
155 | * make_hdr | |
156 | * | |
157 | * Make the header in the new a.out from the header in core. | |
158 | * Modify the text and data sizes. | |
159 | */ | |
160 | static int | |
0248680a | 161 | make_hdr (int new, int a_out, |
0248680a | 162 | char *a_name, char *new_name) |
4e3a36cd | 163 | { |
0248680a | 164 | int scns; |
dd5ecd6b DN |
165 | unsigned int bss_start; |
166 | unsigned int data_start; | |
4e3a36cd JB |
167 | |
168 | struct scnhdr section[MAX_SECTIONS]; | |
169 | struct scnhdr * f_thdr; /* Text section header */ | |
170 | struct scnhdr * f_dhdr; /* Data section header */ | |
171 | struct scnhdr * f_bhdr; /* Bss section header */ | |
172 | struct scnhdr * f_lhdr; /* Loader section header */ | |
173 | struct scnhdr * f_tchdr; /* Typechk section header */ | |
174 | struct scnhdr * f_dbhdr; /* Debug section header */ | |
175 | struct scnhdr * f_xhdr; /* Except section header */ | |
176 | ||
177 | load_scnptr = orig_load_scnptr = lnnoptr = 0; | |
178 | pagemask = getpagesize () - 1; | |
179 | ||
180 | /* Adjust text/data boundary. */ | |
4e3a36cd | 181 | data_start = (long) start_of_data (); |
4e3a36cd JB |
182 | data_start = ADDR_CORRECT (data_start); |
183 | ||
4e3a36cd | 184 | data_start = data_start & ~pagemask; /* (Down) to page boundary. */ |
4e3a36cd | 185 | |
dd5ecd6b DN |
186 | bss_start = ADDR_CORRECT (sbrk (0)) + pagemask; |
187 | bss_start &= ~ pagemask; | |
76998edb | 188 | |
4e3a36cd JB |
189 | if (data_start > bss_start) /* Can't have negative data size. */ |
190 | { | |
191 | ERROR2 ("unexec: data_start (%u) can't be greater than bss_start (%u)", | |
192 | data_start, bss_start); | |
193 | } | |
76998edb | 194 | |
4e3a36cd | 195 | /* Salvage as much info from the existing file as possible */ |
4e3a36cd JB |
196 | f_thdr = NULL; f_dhdr = NULL; f_bhdr = NULL; |
197 | f_lhdr = NULL; f_tchdr = NULL; f_dbhdr = NULL; f_xhdr = NULL; | |
198 | if (a_out >= 0) | |
76998edb | 199 | { |
4e3a36cd JB |
200 | if (read (a_out, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) |
201 | { | |
202 | PERROR (a_name); | |
203 | } | |
4e3a36cd JB |
204 | if (f_hdr.f_opthdr > 0) |
205 | { | |
206 | if (read (a_out, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) | |
207 | { | |
208 | PERROR (a_name); | |
209 | } | |
4e3a36cd JB |
210 | } |
211 | if (f_hdr.f_nscns > MAX_SECTIONS) | |
212 | { | |
213 | ERROR0 ("unexec: too many section headers -- increase MAX_SECTIONS"); | |
214 | } | |
215 | /* Loop through section headers */ | |
216 | for (scns = 0; scns < f_hdr.f_nscns; scns++) { | |
217 | struct scnhdr *s = §ion[scns]; | |
218 | if (read (a_out, s, sizeof (*s)) != sizeof (*s)) | |
219 | { | |
220 | PERROR (a_name); | |
221 | } | |
4e3a36cd JB |
222 | |
223 | #define CHECK_SCNHDR(ptr, name, flags) \ | |
5e617bc2 | 224 | if (strcmp (s->s_name, name) == 0) { \ |
4e3a36cd | 225 | if (s->s_flags != flags) { \ |
5e617bc2 JB |
226 | fprintf (stderr, "unexec: %lx flags where %x expected in %s section.\n", \ |
227 | (unsigned long)s->s_flags, flags, name); \ | |
4e3a36cd JB |
228 | } \ |
229 | if (ptr) { \ | |
5e617bc2 JB |
230 | fprintf (stderr, "unexec: duplicate section header for section %s.\n", \ |
231 | name); \ | |
4e3a36cd JB |
232 | } \ |
233 | ptr = s; \ | |
234 | } | |
5e617bc2 JB |
235 | CHECK_SCNHDR (f_thdr, _TEXT, STYP_TEXT); |
236 | CHECK_SCNHDR (f_dhdr, _DATA, STYP_DATA); | |
237 | CHECK_SCNHDR (f_bhdr, _BSS, STYP_BSS); | |
238 | CHECK_SCNHDR (f_lhdr, _LOADER, STYP_LOADER); | |
239 | CHECK_SCNHDR (f_dbhdr, _DEBUG, STYP_DEBUG); | |
240 | CHECK_SCNHDR (f_tchdr, _TYPCHK, STYP_TYPCHK); | |
241 | CHECK_SCNHDR (f_xhdr, _EXCEPT, STYP_EXCEPT); | |
4e3a36cd JB |
242 | } |
243 | ||
244 | if (f_thdr == 0) | |
245 | { | |
0248680a | 246 | ERROR1 ("unexec: couldn't find \"%s\" section", (int) _TEXT); |
4e3a36cd JB |
247 | } |
248 | if (f_dhdr == 0) | |
249 | { | |
0248680a | 250 | ERROR1 ("unexec: couldn't find \"%s\" section", (int) _DATA); |
4e3a36cd JB |
251 | } |
252 | if (f_bhdr == 0) | |
253 | { | |
0248680a | 254 | ERROR1 ("unexec: couldn't find \"%s\" section", (int) _BSS); |
4e3a36cd | 255 | } |
76998edb | 256 | } |
4e3a36cd | 257 | else |
76998edb | 258 | { |
4e3a36cd | 259 | ERROR0 ("can't build a COFF file from scratch yet"); |
76998edb | 260 | } |
4e3a36cd JB |
261 | orig_data_scnptr = f_dhdr->s_scnptr; |
262 | orig_load_scnptr = f_lhdr ? f_lhdr->s_scnptr : 0; | |
263 | ||
264 | /* Now we alter the contents of all the f_*hdr variables | |
265 | to correspond to what we want to dump. */ | |
4a438fc5 RS |
266 | |
267 | /* Indicate that the reloc information is no longer valid for ld (bind); | |
268 | we only update it enough to fake out the exec-time loader. */ | |
269 | f_hdr.f_flags |= (F_RELFLG | F_EXEC); | |
270 | ||
0248680a | 271 | f_ohdr.dsize = bss_start - f_ohdr.data_start; |
dd5ecd6b | 272 | f_ohdr.bsize = 0; |
4e3a36cd JB |
273 | |
274 | f_dhdr->s_size = f_ohdr.dsize; | |
275 | f_bhdr->s_size = f_ohdr.bsize; | |
4a438fc5 RS |
276 | f_bhdr->s_paddr = f_ohdr.data_start + f_ohdr.dsize; |
277 | f_bhdr->s_vaddr = f_ohdr.data_start + f_ohdr.dsize; | |
4e3a36cd JB |
278 | |
279 | /* fix scnptr's */ | |
280 | { | |
4a438fc5 | 281 | ulong ptr = section[0].s_scnptr; |
4e3a36cd | 282 | |
4a438fc5 RS |
283 | bias = -1; |
284 | for (scns = 0; scns < f_hdr.f_nscns; scns++) | |
285 | { | |
286 | struct scnhdr *s = §ion[scns]; | |
4e3a36cd | 287 | |
4a438fc5 RS |
288 | if (s->s_flags & STYP_PAD) /* .pad sections omitted in AIX 4.1 */ |
289 | { | |
290 | /* | |
291 | * the text_start should probably be o_algntext but that doesn't | |
292 | * seem to change | |
293 | */ | |
294 | if (f_ohdr.text_start != 0) /* && scns != 0 */ | |
295 | { | |
296 | s->s_size = 512 - (ptr % 512); | |
297 | if (s->s_size == 512) | |
298 | s->s_size = 0; | |
299 | } | |
300 | s->s_scnptr = ptr; | |
301 | } | |
302 | else if (s->s_flags & STYP_DATA) | |
4e3a36cd | 303 | s->s_scnptr = ptr; |
4a438fc5 RS |
304 | else if (!(s->s_flags & (STYP_TEXT | STYP_BSS))) |
305 | { | |
306 | if (bias == -1) /* if first section after bss */ | |
307 | bias = ptr - s->s_scnptr; | |
4e3a36cd | 308 | |
4a438fc5 RS |
309 | s->s_scnptr += bias; |
310 | ptr = s->s_scnptr; | |
311 | } | |
177c0ea7 | 312 | |
4a438fc5 RS |
313 | ptr = ptr + s->s_size; |
314 | } | |
4e3a36cd JB |
315 | } |
316 | ||
317 | /* fix other pointers */ | |
4a438fc5 RS |
318 | for (scns = 0; scns < f_hdr.f_nscns; scns++) |
319 | { | |
320 | struct scnhdr *s = §ion[scns]; | |
4e3a36cd | 321 | |
4a438fc5 RS |
322 | if (s->s_relptr != 0) |
323 | { | |
324 | s->s_relptr += bias; | |
325 | } | |
326 | if (s->s_lnnoptr != 0) | |
327 | { | |
328 | if (lnnoptr == 0) lnnoptr = s->s_lnnoptr; | |
329 | s->s_lnnoptr += bias; | |
330 | } | |
331 | } | |
4e3a36cd JB |
332 | |
333 | if (f_hdr.f_symptr > 0L) | |
76998edb | 334 | { |
4e3a36cd | 335 | f_hdr.f_symptr += bias; |
76998edb JB |
336 | } |
337 | ||
4e3a36cd JB |
338 | text_scnptr = f_thdr->s_scnptr; |
339 | data_scnptr = f_dhdr->s_scnptr; | |
340 | load_scnptr = f_lhdr ? f_lhdr->s_scnptr : 0; | |
76998edb | 341 | |
4e3a36cd JB |
342 | if (write (new, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) |
343 | { | |
344 | PERROR (new_name); | |
345 | } | |
76998edb | 346 | |
4e3a36cd JB |
347 | if (f_hdr.f_opthdr > 0) |
348 | { | |
349 | if (write (new, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) | |
76998edb | 350 | { |
4e3a36cd JB |
351 | PERROR (new_name); |
352 | } | |
353 | } | |
76998edb | 354 | |
4e3a36cd JB |
355 | for (scns = 0; scns < f_hdr.f_nscns; scns++) { |
356 | struct scnhdr *s = §ion[scns]; | |
357 | if (write (new, s, sizeof (*s)) != sizeof (*s)) | |
358 | { | |
359 | PERROR (new_name); | |
360 | } | |
361 | } | |
76998edb | 362 | |
4e3a36cd | 363 | return (0); |
4e3a36cd JB |
364 | } |
365 | \f | |
366 | /* **************************************************************** | |
177c0ea7 | 367 | |
4e3a36cd JB |
368 | * |
369 | * Copy the text and data segments from memory to the new a.out | |
370 | */ | |
371 | static int | |
0248680a | 372 | copy_text_and_data (int new) |
4e3a36cd | 373 | { |
0248680a DL |
374 | char *end; |
375 | char *ptr; | |
4e3a36cd | 376 | |
0248680a | 377 | lseek (new, (long) text_scnptr, SEEK_SET); |
4e3a36cd JB |
378 | ptr = start_of_text () + text_scnptr; |
379 | end = ptr + f_ohdr.tsize; | |
380 | write_segment (new, ptr, end); | |
381 | ||
0248680a DL |
382 | lseek (new, (long) data_scnptr, SEEK_SET); |
383 | ptr = (char *) f_ohdr.data_start; | |
4e3a36cd JB |
384 | end = ptr + f_ohdr.dsize; |
385 | write_segment (new, ptr, end); | |
386 | ||
387 | return 0; | |
388 | } | |
389 | ||
91b97ddb | 390 | #define UnexBlockSz (1<<12) /* read/write block size */ |
0248680a DL |
391 | static void |
392 | write_segment (int new, char *ptr, char *end) | |
4e3a36cd | 393 | { |
0248680a | 394 | int i, nwrite, ret; |
4e3a36cd | 395 | char buf[80]; |
91b97ddb | 396 | char zeros[UnexBlockSz]; |
4e3a36cd JB |
397 | |
398 | for (i = 0; ptr < end;) | |
399 | { | |
91b97ddb RS |
400 | /* distance to next block. */ |
401 | nwrite = (((int) ptr + UnexBlockSz) & -UnexBlockSz) - (int) ptr; | |
4e3a36cd JB |
402 | /* But not beyond specified end. */ |
403 | if (nwrite > end - ptr) nwrite = end - ptr; | |
404 | ret = write (new, ptr, nwrite); | |
405 | /* If write gets a page fault, it means we reached | |
406 | a gap between the old text segment and the old data segment. | |
407 | This gap has probably been remapped into part of the text segment. | |
408 | So write zeros for it. */ | |
409 | if (ret == -1 && errno == EFAULT) | |
76998edb | 410 | { |
0248680a | 411 | memset (zeros, 0, nwrite); |
91b97ddb | 412 | write (new, zeros, nwrite); |
76998edb | 413 | } |
4e3a36cd | 414 | else if (nwrite != ret) |
76998edb | 415 | { |
4e3a36cd | 416 | sprintf (buf, |
d63c1903 KH |
417 | "unexec write failure: addr 0x%lx, fileno %d, size 0x%x, wrote 0x%x, errno %d", |
418 | (unsigned long)ptr, new, nwrite, ret, errno); | |
4e3a36cd | 419 | PERROR (buf); |
76998edb | 420 | } |
4e3a36cd JB |
421 | i += nwrite; |
422 | ptr += nwrite; | |
423 | } | |
424 | } | |
425 | \f | |
426 | /* **************************************************************** | |
427 | * copy_sym | |
428 | * | |
429 | * Copy the relocation information and symbol table from the a.out to the new | |
430 | */ | |
431 | static int | |
0248680a | 432 | copy_sym (int new, int a_out, char *a_name, char *new_name) |
4e3a36cd | 433 | { |
91b97ddb | 434 | char page[UnexBlockSz]; |
4e3a36cd | 435 | int n; |
76998edb | 436 | |
4e3a36cd JB |
437 | if (a_out < 0) |
438 | return 0; | |
76998edb | 439 | |
4a438fc5 | 440 | if (orig_load_scnptr == 0L) |
4e3a36cd | 441 | return 0; |
76998edb | 442 | |
4a438fc5 | 443 | if (lnnoptr && lnnoptr < orig_load_scnptr) /* if there is line number info */ |
0248680a | 444 | lseek (a_out, lnnoptr, SEEK_SET); /* start copying from there */ |
4e3a36cd | 445 | else |
0248680a | 446 | lseek (a_out, orig_load_scnptr, SEEK_SET); /* Position a.out to symtab. */ |
4e3a36cd JB |
447 | |
448 | while ((n = read (a_out, page, sizeof page)) > 0) | |
449 | { | |
450 | if (write (new, page, n) != n) | |
76998edb | 451 | { |
4e3a36cd | 452 | PERROR (new_name); |
76998edb JB |
453 | } |
454 | } | |
4e3a36cd JB |
455 | if (n < 0) |
456 | { | |
457 | PERROR (a_name); | |
458 | } | |
459 | return 0; | |
460 | } | |
461 | \f | |
462 | /* **************************************************************** | |
463 | * mark_x | |
464 | * | |
eb8c3be9 | 465 | * After successfully building the new a.out, mark it executable |
4e3a36cd JB |
466 | */ |
467 | static void | |
0248680a | 468 | mark_x (char *name) |
4e3a36cd JB |
469 | { |
470 | struct stat sbuf; | |
471 | int um; | |
472 | int new = 0; /* for PERROR */ | |
76998edb | 473 | |
4e3a36cd JB |
474 | um = umask (777); |
475 | umask (um); | |
476 | if (stat (name, &sbuf) == -1) | |
477 | { | |
478 | PERROR (name); | |
479 | } | |
480 | sbuf.st_mode |= 0111 & ~um; | |
481 | if (chmod (name, sbuf.st_mode) == -1) | |
482 | PERROR (name); | |
483 | } | |
484 | \f | |
0248680a DL |
485 | static int |
486 | adjust_lnnoptrs (int writedesc, int readdesc, char *new_name) | |
4e3a36cd | 487 | { |
0248680a DL |
488 | int nsyms; |
489 | int naux; | |
490 | int new; | |
4e3a36cd JB |
491 | struct syment symentry; |
492 | union auxent auxentry; | |
4e3a36cd JB |
493 | |
494 | if (!lnnoptr || !f_hdr.f_symptr) | |
495 | return 0; | |
496 | ||
0248680a | 497 | if ((new = open (new_name, O_RDWR)) < 0) |
4e3a36cd JB |
498 | { |
499 | PERROR (new_name); | |
500 | return -1; | |
501 | } | |
502 | ||
0248680a | 503 | lseek (new, f_hdr.f_symptr, SEEK_SET); |
4e3a36cd JB |
504 | for (nsyms = 0; nsyms < f_hdr.f_nsyms; nsyms++) |
505 | { | |
506 | read (new, &symentry, SYMESZ); | |
91b97ddb RS |
507 | if (symentry.n_sclass == C_BINCL || symentry.n_sclass == C_EINCL) |
508 | { | |
509 | symentry.n_value += bias; | |
0248680a | 510 | lseek (new, -SYMESZ, SEEK_CUR); |
91b97ddb RS |
511 | write (new, &symentry, SYMESZ); |
512 | } | |
513 | ||
4a438fc5 | 514 | for (naux = symentry.n_numaux; naux-- != 0; ) |
4e3a36cd JB |
515 | { |
516 | read (new, &auxentry, AUXESZ); | |
517 | nsyms++; | |
4a438fc5 RS |
518 | if (naux != 0 /* skip csect auxentry (last entry) */ |
519 | && (symentry.n_sclass == C_EXT || symentry.n_sclass == C_HIDEXT)) | |
520 | { | |
521 | auxentry.x_sym.x_fcnary.x_fcn.x_lnnoptr += bias; | |
0248680a | 522 | lseek (new, -AUXESZ, SEEK_CUR); |
4a438fc5 RS |
523 | write (new, &auxentry, AUXESZ); |
524 | } | |
4e3a36cd JB |
525 | } |
526 | } | |
527 | close (new); | |
76998edb | 528 | |
0248680a DL |
529 | return 0; |
530 | } | |
4e3a36cd | 531 | |
0248680a DL |
532 | static int |
533 | unrelocate_symbols (int new, int a_out, char *a_name, char *new_name) | |
76998edb | 534 | { |
0248680a | 535 | int i; |
4e3a36cd | 536 | LDHDR ldhdr; |
0248680a | 537 | LDREL ldrel; |
4a438fc5 | 538 | ulong t_reloc = (ulong) &_text - f_ohdr.text_start; |
0248680a DL |
539 | #ifndef ALIGN_DATA_RELOC |
540 | ulong d_reloc = (ulong) &_data - f_ohdr.data_start; | |
541 | #else | |
177c0ea7 | 542 | /* This worked (and was needed) before AIX 4.2. |
0248680a | 543 | I have no idea why. -- Mike */ |
5e617bc2 | 544 | ulong d_reloc = (ulong) &_data - ALIGN (f_ohdr.data_start, 2); |
0248680a | 545 | #endif |
4e3a36cd | 546 | int * p; |
4e3a36cd JB |
547 | |
548 | if (load_scnptr == 0) | |
549 | return 0; | |
550 | ||
0248680a | 551 | lseek (a_out, orig_load_scnptr, SEEK_SET); |
4e3a36cd JB |
552 | if (read (a_out, &ldhdr, sizeof (ldhdr)) != sizeof (ldhdr)) |
553 | { | |
554 | PERROR (new_name); | |
555 | } | |
556 | ||
557 | #define SYMNDX_TEXT 0 | |
558 | #define SYMNDX_DATA 1 | |
559 | #define SYMNDX_BSS 2 | |
4e3a36cd | 560 | |
0248680a DL |
561 | for (i = 0; i < ldhdr.l_nreloc; i++) |
562 | { | |
563 | lseek (a_out, | |
564 | orig_load_scnptr + LDHDRSZ + LDSYMSZ*ldhdr.l_nsyms + LDRELSZ*i, | |
565 | SEEK_SET); | |
4e3a36cd | 566 | |
0248680a DL |
567 | if (read (a_out, &ldrel, LDRELSZ) != LDRELSZ) |
568 | { | |
569 | PERROR (a_name); | |
570 | } | |
4e3a36cd JB |
571 | |
572 | /* move the BSS loader symbols to the DATA segment */ | |
0248680a | 573 | if (ldrel.l_symndx == SYMNDX_BSS) |
4e3a36cd | 574 | { |
0248680a | 575 | ldrel.l_symndx = SYMNDX_DATA; |
91b97ddb | 576 | |
4e3a36cd JB |
577 | lseek (new, |
578 | load_scnptr + LDHDRSZ + LDSYMSZ*ldhdr.l_nsyms + LDRELSZ*i, | |
0248680a | 579 | SEEK_SET); |
4e3a36cd | 580 | |
0248680a | 581 | if (write (new, &ldrel, LDRELSZ) != LDRELSZ) |
4e3a36cd JB |
582 | { |
583 | PERROR (new_name); | |
584 | } | |
585 | } | |
586 | ||
0248680a | 587 | if (ldrel.l_rsecnm == f_ohdr.o_sndata) |
4e3a36cd JB |
588 | { |
589 | int orig_int; | |
590 | ||
4a438fc5 | 591 | lseek (a_out, |
0248680a DL |
592 | orig_data_scnptr + (ldrel.l_vaddr - f_ohdr.data_start), |
593 | SEEK_SET); | |
4e3a36cd | 594 | |
0248680a DL |
595 | if (read (a_out, (void *) &orig_int, sizeof (orig_int)) |
596 | != sizeof (orig_int)) | |
4e3a36cd JB |
597 | { |
598 | PERROR (a_name); | |
599 | } | |
600 | ||
0248680a | 601 | p = (int *) (ldrel.l_vaddr + d_reloc); |
4a438fc5 | 602 | |
0248680a | 603 | switch (ldrel.l_symndx) { |
4e3a36cd | 604 | case SYMNDX_TEXT: |
4a438fc5 | 605 | orig_int = * p - t_reloc; |
4e3a36cd JB |
606 | break; |
607 | ||
608 | case SYMNDX_DATA: | |
609 | case SYMNDX_BSS: | |
4a438fc5 | 610 | orig_int = * p - d_reloc; |
4e3a36cd JB |
611 | break; |
612 | } | |
613 | ||
4a438fc5 RS |
614 | if (orig_int != * p) |
615 | { | |
616 | lseek (new, | |
0248680a DL |
617 | data_scnptr + (ldrel.l_vaddr - f_ohdr.data_start), |
618 | SEEK_SET); | |
4a438fc5 RS |
619 | if (write (new, (void *) &orig_int, sizeof (orig_int)) |
620 | != sizeof (orig_int)) | |
621 | { | |
622 | PERROR (new_name); | |
623 | } | |
624 | } | |
4e3a36cd JB |
625 | } |
626 | } | |
0248680a | 627 | return 0; |
76998edb | 628 | } |
ab5796a9 | 629 | |
313d9eb2 DN |
630 | /* |
631 | * Return the address of the start of the text segment prior to | |
632 | * doing an unexec. After unexec the return value is undefined. | |
633 | * See crt0.c for further explanation and _start. | |
634 | * | |
635 | */ | |
636 | ||
637 | char * | |
638 | start_of_text (void) | |
639 | { | |
640 | return ((char *) 0x10000000); | |
641 | } |