Commit | Line | Data |
---|---|---|
0248680a | 1 | /* Dump an executable image. |
429ab54e | 2 | Copyright (C) 1985, 1986, 1987, 1988, 1999, 2001, 2002, 2003, 2004, |
114f9c96 | 3 | 2005, 2006, 2007, 2008, 2009, 2010 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 JB |
33 | * Synopsis: |
34 | * unexec (new_name, a_name, data_start, bss_start, entry_address) | |
35 | * char *new_name, *a_name; | |
36 | * unsigned data_start, bss_start, entry_address; | |
37 | * | |
38 | * Takes a snapshot of the program and makes an a.out format file in the | |
39 | * file named by the string argument new_name. | |
40 | * If a_name is non-NULL, the symbol table will be taken from the given file. | |
41 | * On some machines, an existing a_name file is required. | |
42 | * | |
0248680a | 43 | * data_start and entry_address are ignored. |
4e3a36cd | 44 | * |
0248680a | 45 | * bss_start indicates how much of the data segment is to be saved in the |
4e3a36cd JB |
46 | * a.out file and restored when the program is executed. It gives the lowest |
47 | * unsaved address, and is rounded up to a page boundary. The default when 0 | |
48 | * is given assumes that the entire data segment is to be stored, including | |
49 | * the previous data and bss as well as any additional storage allocated with | |
0248680a | 50 | * sbrk(2). |
4e3a36cd JB |
51 | * |
52 | */ | |
53 | ||
4e3a36cd JB |
54 | #ifndef emacs |
55 | #define PERROR(arg) perror (arg); return -1 | |
56 | #else | |
18160b98 | 57 | #include <config.h> |
4e3a36cd JB |
58 | #define PERROR(file) report_error (file, new) |
59 | #endif | |
76998edb | 60 | |
4e3a36cd JB |
61 | #include <a.out.h> |
62 | /* Define getpagesize () if the system does not. | |
63 | Note that this may depend on symbols defined in a.out.h | |
64 | */ | |
65 | #include "getpagesize.h" | |
76998edb | 66 | |
4e3a36cd | 67 | #include <sys/types.h> |
4e3a36cd JB |
68 | #include <stdio.h> |
69 | #include <sys/stat.h> | |
70 | #include <errno.h> | |
0248680a DL |
71 | #include <unistd.h> |
72 | #include <fcntl.h> | |
4e3a36cd | 73 | |
0248680a DL |
74 | extern char *start_of_text (void); /* Start of text */ |
75 | extern char *start_of_data (void); /* Start of initialized data */ | |
4e3a36cd JB |
76 | |
77 | extern int _data; | |
4e3a36cd | 78 | extern int _text; |
0248680a | 79 | |
4e3a36cd JB |
80 | #include <filehdr.h> |
81 | #include <aouthdr.h> | |
82 | #include <scnhdr.h> | |
83 | #include <syms.h> | |
0248680a | 84 | |
4e3a36cd JB |
85 | static struct filehdr f_hdr; /* File header */ |
86 | static struct aouthdr f_ohdr; /* Optional file header (a.out) */ | |
0248680a DL |
87 | static long bias; /* Bias to add for growth */ |
88 | static long lnnoptr; /* Pointer to line-number info within file */ | |
4e3a36cd JB |
89 | |
90 | static long text_scnptr; | |
91 | static long data_scnptr; | |
4a438fc5 | 92 | #define ALIGN(val, pwr) (((val) + ((1L<<(pwr))-1)) & ~((1L<<(pwr))-1)) |
4e3a36cd JB |
93 | static long load_scnptr; |
94 | static long orig_load_scnptr; | |
95 | static long orig_data_scnptr; | |
0248680a | 96 | static int unrelocate_symbols (int, int, char *, char *); |
4e3a36cd JB |
97 | |
98 | #ifndef MAX_SECTIONS | |
99 | #define MAX_SECTIONS 10 | |
100 | #endif | |
101 | ||
0248680a | 102 | static int adjust_lnnoptrs (int, int, char *); |
4e3a36cd JB |
103 | |
104 | static int pagemask; | |
105 | ||
4e3a36cd | 106 | #ifdef emacs |
d7306fe6 | 107 | #include <setjmp.h> |
8eca17c9 | 108 | #include "lisp.h" |
4e3a36cd | 109 | |
0248680a DL |
110 | static void |
111 | report_error (char *file, int fd) | |
4e3a36cd JB |
112 | { |
113 | if (fd) | |
114 | close (fd); | |
8eca17c9 | 115 | report_file_error ("Cannot unexec", Fcons (build_string (file), Qnil)); |
4e3a36cd JB |
116 | } |
117 | #endif /* emacs */ | |
76998edb | 118 | |
4e3a36cd JB |
119 | #define ERROR0(msg) report_error_1 (new, msg, 0, 0); return -1 |
120 | #define ERROR1(msg,x) report_error_1 (new, msg, x, 0); return -1 | |
121 | #define ERROR2(msg,x,y) report_error_1 (new, msg, x, y); return -1 | |
76998edb | 122 | |
0248680a DL |
123 | static void |
124 | report_error_1 (int fd, char *msg, int a1, int a2) | |
76998edb | 125 | { |
4e3a36cd JB |
126 | close (fd); |
127 | #ifdef emacs | |
128 | error (msg, a1, a2); | |
129 | #else | |
130 | fprintf (stderr, msg, a1, a2); | |
131 | fprintf (stderr, "\n"); | |
132 | #endif | |
133 | } | |
134 | ||
0248680a DL |
135 | static int make_hdr (int, int, unsigned, unsigned, unsigned, char *, char *); |
136 | static void mark_x (char *); | |
137 | static int copy_text_and_data (int); | |
138 | static int copy_sym (int, int, char *, char *); | |
139 | static void write_segment (int, char *, char *); | |
4e3a36cd JB |
140 | \f |
141 | /* **************************************************************** | |
142 | * unexec | |
143 | * | |
144 | * driving logic. | |
145 | */ | |
0248680a | 146 | int unexec (char *new_name, char *a_name, |
c31d7cc9 GM |
147 | unsigned data_start, |
148 | unsigned bss_start, | |
149 | unsigned entry_address) | |
76998edb | 150 | { |
0248680a | 151 | int new = -1, a_out = -1; |
4e3a36cd | 152 | |
0248680a | 153 | if (a_name && (a_out = open (a_name, O_RDONLY)) < 0) |
4e3a36cd JB |
154 | { |
155 | PERROR (a_name); | |
156 | } | |
157 | if ((new = creat (new_name, 0666)) < 0) | |
158 | { | |
159 | PERROR (new_name); | |
160 | } | |
0248680a DL |
161 | if (make_hdr (new, a_out, |
162 | data_start, bss_start, | |
163 | entry_address, | |
164 | a_name, new_name) < 0 | |
4e3a36cd JB |
165 | || copy_text_and_data (new) < 0 |
166 | || copy_sym (new, a_out, a_name, new_name) < 0 | |
4e3a36cd | 167 | || adjust_lnnoptrs (new, a_out, new_name) < 0 |
0248680a | 168 | || unrelocate_symbols (new, a_out, a_name, new_name) < 0) |
76998edb | 169 | { |
4e3a36cd | 170 | close (new); |
177c0ea7 | 171 | return -1; |
76998edb | 172 | } |
76998edb | 173 | |
4e3a36cd JB |
174 | close (new); |
175 | if (a_out >= 0) | |
176 | close (a_out); | |
177 | mark_x (new_name); | |
178 | return 0; | |
179 | } | |
180 | ||
181 | /* **************************************************************** | |
182 | * make_hdr | |
183 | * | |
184 | * Make the header in the new a.out from the header in core. | |
185 | * Modify the text and data sizes. | |
186 | */ | |
187 | static int | |
0248680a DL |
188 | make_hdr (int new, int a_out, |
189 | unsigned data_start, unsigned bss_start, | |
190 | unsigned entry_address, | |
191 | char *a_name, char *new_name) | |
4e3a36cd | 192 | { |
0248680a | 193 | int scns; |
4e3a36cd JB |
194 | unsigned int bss_end; |
195 | ||
196 | struct scnhdr section[MAX_SECTIONS]; | |
197 | struct scnhdr * f_thdr; /* Text section header */ | |
198 | struct scnhdr * f_dhdr; /* Data section header */ | |
199 | struct scnhdr * f_bhdr; /* Bss section header */ | |
200 | struct scnhdr * f_lhdr; /* Loader section header */ | |
201 | struct scnhdr * f_tchdr; /* Typechk section header */ | |
202 | struct scnhdr * f_dbhdr; /* Debug section header */ | |
203 | struct scnhdr * f_xhdr; /* Except section header */ | |
204 | ||
205 | load_scnptr = orig_load_scnptr = lnnoptr = 0; | |
206 | pagemask = getpagesize () - 1; | |
207 | ||
208 | /* Adjust text/data boundary. */ | |
4e3a36cd | 209 | data_start = (long) start_of_data (); |
4e3a36cd JB |
210 | data_start = ADDR_CORRECT (data_start); |
211 | ||
4e3a36cd | 212 | data_start = data_start & ~pagemask; /* (Down) to page boundary. */ |
4e3a36cd JB |
213 | |
214 | bss_end = ADDR_CORRECT (sbrk (0)) + pagemask; | |
215 | bss_end &= ~ pagemask; | |
216 | /* Adjust data/bss boundary. */ | |
217 | if (bss_start != 0) | |
76998edb | 218 | { |
4e3a36cd JB |
219 | bss_start = (ADDR_CORRECT (bss_start) + pagemask); |
220 | /* (Up) to page bdry. */ | |
221 | bss_start &= ~ pagemask; | |
222 | if (bss_start > bss_end) | |
76998edb | 223 | { |
4e3a36cd JB |
224 | ERROR1 ("unexec: Specified bss_start (%u) is past end of program", |
225 | bss_start); | |
76998edb | 226 | } |
76998edb | 227 | } |
4e3a36cd JB |
228 | else |
229 | bss_start = bss_end; | |
76998edb | 230 | |
4e3a36cd JB |
231 | if (data_start > bss_start) /* Can't have negative data size. */ |
232 | { | |
233 | ERROR2 ("unexec: data_start (%u) can't be greater than bss_start (%u)", | |
234 | data_start, bss_start); | |
235 | } | |
76998edb | 236 | |
4e3a36cd | 237 | /* Salvage as much info from the existing file as possible */ |
4e3a36cd JB |
238 | f_thdr = NULL; f_dhdr = NULL; f_bhdr = NULL; |
239 | f_lhdr = NULL; f_tchdr = NULL; f_dbhdr = NULL; f_xhdr = NULL; | |
240 | if (a_out >= 0) | |
76998edb | 241 | { |
4e3a36cd JB |
242 | if (read (a_out, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) |
243 | { | |
244 | PERROR (a_name); | |
245 | } | |
4e3a36cd JB |
246 | if (f_hdr.f_opthdr > 0) |
247 | { | |
248 | if (read (a_out, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) | |
249 | { | |
250 | PERROR (a_name); | |
251 | } | |
4e3a36cd JB |
252 | } |
253 | if (f_hdr.f_nscns > MAX_SECTIONS) | |
254 | { | |
255 | ERROR0 ("unexec: too many section headers -- increase MAX_SECTIONS"); | |
256 | } | |
257 | /* Loop through section headers */ | |
258 | for (scns = 0; scns < f_hdr.f_nscns; scns++) { | |
259 | struct scnhdr *s = §ion[scns]; | |
260 | if (read (a_out, s, sizeof (*s)) != sizeof (*s)) | |
261 | { | |
262 | PERROR (a_name); | |
263 | } | |
4e3a36cd JB |
264 | |
265 | #define CHECK_SCNHDR(ptr, name, flags) \ | |
266 | if (strcmp(s->s_name, name) == 0) { \ | |
267 | if (s->s_flags != flags) { \ | |
d63c1903 KH |
268 | fprintf(stderr, "unexec: %lx flags where %x expected in %s section.\n", \ |
269 | (unsigned long)s->s_flags, flags, name); \ | |
4e3a36cd JB |
270 | } \ |
271 | if (ptr) { \ | |
272 | fprintf(stderr, "unexec: duplicate section header for section %s.\n", \ | |
273 | name); \ | |
274 | } \ | |
275 | ptr = s; \ | |
276 | } | |
277 | CHECK_SCNHDR(f_thdr, _TEXT, STYP_TEXT); | |
278 | CHECK_SCNHDR(f_dhdr, _DATA, STYP_DATA); | |
279 | CHECK_SCNHDR(f_bhdr, _BSS, STYP_BSS); | |
280 | CHECK_SCNHDR(f_lhdr, _LOADER, STYP_LOADER); | |
281 | CHECK_SCNHDR(f_dbhdr, _DEBUG, STYP_DEBUG); | |
282 | CHECK_SCNHDR(f_tchdr, _TYPCHK, STYP_TYPCHK); | |
283 | CHECK_SCNHDR(f_xhdr, _EXCEPT, STYP_EXCEPT); | |
284 | } | |
285 | ||
286 | if (f_thdr == 0) | |
287 | { | |
0248680a | 288 | ERROR1 ("unexec: couldn't find \"%s\" section", (int) _TEXT); |
4e3a36cd JB |
289 | } |
290 | if (f_dhdr == 0) | |
291 | { | |
0248680a | 292 | ERROR1 ("unexec: couldn't find \"%s\" section", (int) _DATA); |
4e3a36cd JB |
293 | } |
294 | if (f_bhdr == 0) | |
295 | { | |
0248680a | 296 | ERROR1 ("unexec: couldn't find \"%s\" section", (int) _BSS); |
4e3a36cd | 297 | } |
76998edb | 298 | } |
4e3a36cd | 299 | else |
76998edb | 300 | { |
4e3a36cd | 301 | ERROR0 ("can't build a COFF file from scratch yet"); |
76998edb | 302 | } |
4e3a36cd JB |
303 | orig_data_scnptr = f_dhdr->s_scnptr; |
304 | orig_load_scnptr = f_lhdr ? f_lhdr->s_scnptr : 0; | |
305 | ||
306 | /* Now we alter the contents of all the f_*hdr variables | |
307 | to correspond to what we want to dump. */ | |
4a438fc5 RS |
308 | |
309 | /* Indicate that the reloc information is no longer valid for ld (bind); | |
310 | we only update it enough to fake out the exec-time loader. */ | |
311 | f_hdr.f_flags |= (F_RELFLG | F_EXEC); | |
312 | ||
0248680a | 313 | f_ohdr.dsize = bss_start - f_ohdr.data_start; |
4e3a36cd JB |
314 | f_ohdr.bsize = bss_end - bss_start; |
315 | ||
316 | f_dhdr->s_size = f_ohdr.dsize; | |
317 | f_bhdr->s_size = f_ohdr.bsize; | |
4a438fc5 RS |
318 | f_bhdr->s_paddr = f_ohdr.data_start + f_ohdr.dsize; |
319 | f_bhdr->s_vaddr = f_ohdr.data_start + f_ohdr.dsize; | |
4e3a36cd JB |
320 | |
321 | /* fix scnptr's */ | |
322 | { | |
4a438fc5 | 323 | ulong ptr = section[0].s_scnptr; |
4e3a36cd | 324 | |
4a438fc5 RS |
325 | bias = -1; |
326 | for (scns = 0; scns < f_hdr.f_nscns; scns++) | |
327 | { | |
328 | struct scnhdr *s = §ion[scns]; | |
4e3a36cd | 329 | |
4a438fc5 RS |
330 | if (s->s_flags & STYP_PAD) /* .pad sections omitted in AIX 4.1 */ |
331 | { | |
332 | /* | |
333 | * the text_start should probably be o_algntext but that doesn't | |
334 | * seem to change | |
335 | */ | |
336 | if (f_ohdr.text_start != 0) /* && scns != 0 */ | |
337 | { | |
338 | s->s_size = 512 - (ptr % 512); | |
339 | if (s->s_size == 512) | |
340 | s->s_size = 0; | |
341 | } | |
342 | s->s_scnptr = ptr; | |
343 | } | |
344 | else if (s->s_flags & STYP_DATA) | |
4e3a36cd | 345 | s->s_scnptr = ptr; |
4a438fc5 RS |
346 | else if (!(s->s_flags & (STYP_TEXT | STYP_BSS))) |
347 | { | |
348 | if (bias == -1) /* if first section after bss */ | |
349 | bias = ptr - s->s_scnptr; | |
4e3a36cd | 350 | |
4a438fc5 RS |
351 | s->s_scnptr += bias; |
352 | ptr = s->s_scnptr; | |
353 | } | |
177c0ea7 | 354 | |
4a438fc5 RS |
355 | ptr = ptr + s->s_size; |
356 | } | |
4e3a36cd JB |
357 | } |
358 | ||
359 | /* fix other pointers */ | |
4a438fc5 RS |
360 | for (scns = 0; scns < f_hdr.f_nscns; scns++) |
361 | { | |
362 | struct scnhdr *s = §ion[scns]; | |
4e3a36cd | 363 | |
4a438fc5 RS |
364 | if (s->s_relptr != 0) |
365 | { | |
366 | s->s_relptr += bias; | |
367 | } | |
368 | if (s->s_lnnoptr != 0) | |
369 | { | |
370 | if (lnnoptr == 0) lnnoptr = s->s_lnnoptr; | |
371 | s->s_lnnoptr += bias; | |
372 | } | |
373 | } | |
4e3a36cd JB |
374 | |
375 | if (f_hdr.f_symptr > 0L) | |
76998edb | 376 | { |
4e3a36cd | 377 | f_hdr.f_symptr += bias; |
76998edb JB |
378 | } |
379 | ||
4e3a36cd JB |
380 | text_scnptr = f_thdr->s_scnptr; |
381 | data_scnptr = f_dhdr->s_scnptr; | |
382 | load_scnptr = f_lhdr ? f_lhdr->s_scnptr : 0; | |
76998edb | 383 | |
4e3a36cd JB |
384 | if (write (new, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) |
385 | { | |
386 | PERROR (new_name); | |
387 | } | |
76998edb | 388 | |
4e3a36cd JB |
389 | if (f_hdr.f_opthdr > 0) |
390 | { | |
391 | if (write (new, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) | |
76998edb | 392 | { |
4e3a36cd JB |
393 | PERROR (new_name); |
394 | } | |
395 | } | |
76998edb | 396 | |
4e3a36cd JB |
397 | for (scns = 0; scns < f_hdr.f_nscns; scns++) { |
398 | struct scnhdr *s = §ion[scns]; | |
399 | if (write (new, s, sizeof (*s)) != sizeof (*s)) | |
400 | { | |
401 | PERROR (new_name); | |
402 | } | |
403 | } | |
76998edb | 404 | |
4e3a36cd | 405 | return (0); |
4e3a36cd JB |
406 | } |
407 | \f | |
408 | /* **************************************************************** | |
177c0ea7 | 409 | |
4e3a36cd JB |
410 | * |
411 | * Copy the text and data segments from memory to the new a.out | |
412 | */ | |
413 | static int | |
0248680a | 414 | copy_text_and_data (int new) |
4e3a36cd | 415 | { |
0248680a DL |
416 | char *end; |
417 | char *ptr; | |
4e3a36cd | 418 | |
0248680a | 419 | lseek (new, (long) text_scnptr, SEEK_SET); |
4e3a36cd JB |
420 | ptr = start_of_text () + text_scnptr; |
421 | end = ptr + f_ohdr.tsize; | |
422 | write_segment (new, ptr, end); | |
423 | ||
0248680a DL |
424 | lseek (new, (long) data_scnptr, SEEK_SET); |
425 | ptr = (char *) f_ohdr.data_start; | |
4e3a36cd JB |
426 | end = ptr + f_ohdr.dsize; |
427 | write_segment (new, ptr, end); | |
428 | ||
429 | return 0; | |
430 | } | |
431 | ||
91b97ddb | 432 | #define UnexBlockSz (1<<12) /* read/write block size */ |
0248680a DL |
433 | static void |
434 | write_segment (int new, char *ptr, char *end) | |
4e3a36cd | 435 | { |
0248680a | 436 | int i, nwrite, ret; |
4e3a36cd JB |
437 | char buf[80]; |
438 | extern int errno; | |
91b97ddb | 439 | char zeros[UnexBlockSz]; |
4e3a36cd JB |
440 | |
441 | for (i = 0; ptr < end;) | |
442 | { | |
91b97ddb RS |
443 | /* distance to next block. */ |
444 | nwrite = (((int) ptr + UnexBlockSz) & -UnexBlockSz) - (int) ptr; | |
4e3a36cd JB |
445 | /* But not beyond specified end. */ |
446 | if (nwrite > end - ptr) nwrite = end - ptr; | |
447 | ret = write (new, ptr, nwrite); | |
448 | /* If write gets a page fault, it means we reached | |
449 | a gap between the old text segment and the old data segment. | |
450 | This gap has probably been remapped into part of the text segment. | |
451 | So write zeros for it. */ | |
452 | if (ret == -1 && errno == EFAULT) | |
76998edb | 453 | { |
0248680a | 454 | memset (zeros, 0, nwrite); |
91b97ddb | 455 | write (new, zeros, nwrite); |
76998edb | 456 | } |
4e3a36cd | 457 | else if (nwrite != ret) |
76998edb | 458 | { |
4e3a36cd | 459 | sprintf (buf, |
d63c1903 KH |
460 | "unexec write failure: addr 0x%lx, fileno %d, size 0x%x, wrote 0x%x, errno %d", |
461 | (unsigned long)ptr, new, nwrite, ret, errno); | |
4e3a36cd | 462 | PERROR (buf); |
76998edb | 463 | } |
4e3a36cd JB |
464 | i += nwrite; |
465 | ptr += nwrite; | |
466 | } | |
467 | } | |
468 | \f | |
469 | /* **************************************************************** | |
470 | * copy_sym | |
471 | * | |
472 | * Copy the relocation information and symbol table from the a.out to the new | |
473 | */ | |
474 | static int | |
0248680a | 475 | copy_sym (int new, int a_out, char *a_name, char *new_name) |
4e3a36cd | 476 | { |
91b97ddb | 477 | char page[UnexBlockSz]; |
4e3a36cd | 478 | int n; |
76998edb | 479 | |
4e3a36cd JB |
480 | if (a_out < 0) |
481 | return 0; | |
76998edb | 482 | |
4a438fc5 | 483 | if (orig_load_scnptr == 0L) |
4e3a36cd | 484 | return 0; |
76998edb | 485 | |
4a438fc5 | 486 | if (lnnoptr && lnnoptr < orig_load_scnptr) /* if there is line number info */ |
0248680a | 487 | lseek (a_out, lnnoptr, SEEK_SET); /* start copying from there */ |
4e3a36cd | 488 | else |
0248680a | 489 | lseek (a_out, orig_load_scnptr, SEEK_SET); /* Position a.out to symtab. */ |
4e3a36cd JB |
490 | |
491 | while ((n = read (a_out, page, sizeof page)) > 0) | |
492 | { | |
493 | if (write (new, page, n) != n) | |
76998edb | 494 | { |
4e3a36cd | 495 | PERROR (new_name); |
76998edb JB |
496 | } |
497 | } | |
4e3a36cd JB |
498 | if (n < 0) |
499 | { | |
500 | PERROR (a_name); | |
501 | } | |
502 | return 0; | |
503 | } | |
504 | \f | |
505 | /* **************************************************************** | |
506 | * mark_x | |
507 | * | |
eb8c3be9 | 508 | * After successfully building the new a.out, mark it executable |
4e3a36cd JB |
509 | */ |
510 | static void | |
0248680a | 511 | mark_x (char *name) |
4e3a36cd JB |
512 | { |
513 | struct stat sbuf; | |
514 | int um; | |
515 | int new = 0; /* for PERROR */ | |
76998edb | 516 | |
4e3a36cd JB |
517 | um = umask (777); |
518 | umask (um); | |
519 | if (stat (name, &sbuf) == -1) | |
520 | { | |
521 | PERROR (name); | |
522 | } | |
523 | sbuf.st_mode |= 0111 & ~um; | |
524 | if (chmod (name, sbuf.st_mode) == -1) | |
525 | PERROR (name); | |
526 | } | |
527 | \f | |
0248680a DL |
528 | static int |
529 | adjust_lnnoptrs (int writedesc, int readdesc, char *new_name) | |
4e3a36cd | 530 | { |
0248680a DL |
531 | int nsyms; |
532 | int naux; | |
533 | int new; | |
4e3a36cd JB |
534 | struct syment symentry; |
535 | union auxent auxentry; | |
4e3a36cd JB |
536 | |
537 | if (!lnnoptr || !f_hdr.f_symptr) | |
538 | return 0; | |
539 | ||
0248680a | 540 | if ((new = open (new_name, O_RDWR)) < 0) |
4e3a36cd JB |
541 | { |
542 | PERROR (new_name); | |
543 | return -1; | |
544 | } | |
545 | ||
0248680a | 546 | lseek (new, f_hdr.f_symptr, SEEK_SET); |
4e3a36cd JB |
547 | for (nsyms = 0; nsyms < f_hdr.f_nsyms; nsyms++) |
548 | { | |
549 | read (new, &symentry, SYMESZ); | |
91b97ddb RS |
550 | if (symentry.n_sclass == C_BINCL || symentry.n_sclass == C_EINCL) |
551 | { | |
552 | symentry.n_value += bias; | |
0248680a | 553 | lseek (new, -SYMESZ, SEEK_CUR); |
91b97ddb RS |
554 | write (new, &symentry, SYMESZ); |
555 | } | |
556 | ||
4a438fc5 | 557 | for (naux = symentry.n_numaux; naux-- != 0; ) |
4e3a36cd JB |
558 | { |
559 | read (new, &auxentry, AUXESZ); | |
560 | nsyms++; | |
4a438fc5 RS |
561 | if (naux != 0 /* skip csect auxentry (last entry) */ |
562 | && (symentry.n_sclass == C_EXT || symentry.n_sclass == C_HIDEXT)) | |
563 | { | |
564 | auxentry.x_sym.x_fcnary.x_fcn.x_lnnoptr += bias; | |
0248680a | 565 | lseek (new, -AUXESZ, SEEK_CUR); |
4a438fc5 RS |
566 | write (new, &auxentry, AUXESZ); |
567 | } | |
4e3a36cd JB |
568 | } |
569 | } | |
570 | close (new); | |
76998edb | 571 | |
0248680a DL |
572 | return 0; |
573 | } | |
4e3a36cd | 574 | |
0248680a DL |
575 | static int |
576 | unrelocate_symbols (int new, int a_out, char *a_name, char *new_name) | |
76998edb | 577 | { |
0248680a | 578 | int i; |
4e3a36cd | 579 | LDHDR ldhdr; |
0248680a | 580 | LDREL ldrel; |
4a438fc5 | 581 | ulong t_reloc = (ulong) &_text - f_ohdr.text_start; |
0248680a DL |
582 | #ifndef ALIGN_DATA_RELOC |
583 | ulong d_reloc = (ulong) &_data - f_ohdr.data_start; | |
584 | #else | |
177c0ea7 | 585 | /* This worked (and was needed) before AIX 4.2. |
0248680a | 586 | I have no idea why. -- Mike */ |
4a438fc5 | 587 | ulong d_reloc = (ulong) &_data - ALIGN(f_ohdr.data_start, 2); |
0248680a | 588 | #endif |
4e3a36cd | 589 | int * p; |
4e3a36cd JB |
590 | |
591 | if (load_scnptr == 0) | |
592 | return 0; | |
593 | ||
0248680a | 594 | lseek (a_out, orig_load_scnptr, SEEK_SET); |
4e3a36cd JB |
595 | if (read (a_out, &ldhdr, sizeof (ldhdr)) != sizeof (ldhdr)) |
596 | { | |
597 | PERROR (new_name); | |
598 | } | |
599 | ||
600 | #define SYMNDX_TEXT 0 | |
601 | #define SYMNDX_DATA 1 | |
602 | #define SYMNDX_BSS 2 | |
4e3a36cd | 603 | |
0248680a DL |
604 | for (i = 0; i < ldhdr.l_nreloc; i++) |
605 | { | |
606 | lseek (a_out, | |
607 | orig_load_scnptr + LDHDRSZ + LDSYMSZ*ldhdr.l_nsyms + LDRELSZ*i, | |
608 | SEEK_SET); | |
4e3a36cd | 609 | |
0248680a DL |
610 | if (read (a_out, &ldrel, LDRELSZ) != LDRELSZ) |
611 | { | |
612 | PERROR (a_name); | |
613 | } | |
4e3a36cd JB |
614 | |
615 | /* move the BSS loader symbols to the DATA segment */ | |
0248680a | 616 | if (ldrel.l_symndx == SYMNDX_BSS) |
4e3a36cd | 617 | { |
0248680a | 618 | ldrel.l_symndx = SYMNDX_DATA; |
91b97ddb | 619 | |
4e3a36cd JB |
620 | lseek (new, |
621 | load_scnptr + LDHDRSZ + LDSYMSZ*ldhdr.l_nsyms + LDRELSZ*i, | |
0248680a | 622 | SEEK_SET); |
4e3a36cd | 623 | |
0248680a | 624 | if (write (new, &ldrel, LDRELSZ) != LDRELSZ) |
4e3a36cd JB |
625 | { |
626 | PERROR (new_name); | |
627 | } | |
628 | } | |
629 | ||
0248680a | 630 | if (ldrel.l_rsecnm == f_ohdr.o_sndata) |
4e3a36cd JB |
631 | { |
632 | int orig_int; | |
633 | ||
4a438fc5 | 634 | lseek (a_out, |
0248680a DL |
635 | orig_data_scnptr + (ldrel.l_vaddr - f_ohdr.data_start), |
636 | SEEK_SET); | |
4e3a36cd | 637 | |
0248680a DL |
638 | if (read (a_out, (void *) &orig_int, sizeof (orig_int)) |
639 | != sizeof (orig_int)) | |
4e3a36cd JB |
640 | { |
641 | PERROR (a_name); | |
642 | } | |
643 | ||
0248680a | 644 | p = (int *) (ldrel.l_vaddr + d_reloc); |
4a438fc5 | 645 | |
0248680a | 646 | switch (ldrel.l_symndx) { |
4e3a36cd | 647 | case SYMNDX_TEXT: |
4a438fc5 | 648 | orig_int = * p - t_reloc; |
4e3a36cd JB |
649 | break; |
650 | ||
651 | case SYMNDX_DATA: | |
652 | case SYMNDX_BSS: | |
4a438fc5 | 653 | orig_int = * p - d_reloc; |
4e3a36cd JB |
654 | break; |
655 | } | |
656 | ||
4a438fc5 RS |
657 | if (orig_int != * p) |
658 | { | |
659 | lseek (new, | |
0248680a DL |
660 | data_scnptr + (ldrel.l_vaddr - f_ohdr.data_start), |
661 | SEEK_SET); | |
4a438fc5 RS |
662 | if (write (new, (void *) &orig_int, sizeof (orig_int)) |
663 | != sizeof (orig_int)) | |
664 | { | |
665 | PERROR (new_name); | |
666 | } | |
667 | } | |
4e3a36cd JB |
668 | } |
669 | } | |
0248680a | 670 | return 0; |
76998edb | 671 | } |
ab5796a9 MB |
672 | |
673 | /* arch-tag: 0783857a-7c2d-456f-a426-58b722d69fd0 | |
674 | (do not change this comment) */ |