Commit | Line | Data |
---|---|---|
0248680a | 1 | /* Dump an executable image. |
429ab54e | 2 | Copyright (C) 1985, 1986, 1987, 1988, 1999, 2001, 2002, 2003, 2004, |
8cabe764 | 3 | 2005, 2006, 2007, 2008 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 |
8eca17c9 | 107 | #include "lisp.h" |
4e3a36cd | 108 | |
0248680a DL |
109 | static void |
110 | report_error (char *file, int fd) | |
4e3a36cd JB |
111 | { |
112 | if (fd) | |
113 | close (fd); | |
8eca17c9 | 114 | report_file_error ("Cannot unexec", Fcons (build_string (file), Qnil)); |
4e3a36cd JB |
115 | } |
116 | #endif /* emacs */ | |
76998edb | 117 | |
4e3a36cd JB |
118 | #define ERROR0(msg) report_error_1 (new, msg, 0, 0); return -1 |
119 | #define ERROR1(msg,x) report_error_1 (new, msg, x, 0); return -1 | |
120 | #define ERROR2(msg,x,y) report_error_1 (new, msg, x, y); return -1 | |
76998edb | 121 | |
0248680a DL |
122 | static void |
123 | report_error_1 (int fd, char *msg, int a1, int a2) | |
76998edb | 124 | { |
4e3a36cd JB |
125 | close (fd); |
126 | #ifdef emacs | |
127 | error (msg, a1, a2); | |
128 | #else | |
129 | fprintf (stderr, msg, a1, a2); | |
130 | fprintf (stderr, "\n"); | |
131 | #endif | |
132 | } | |
133 | ||
0248680a DL |
134 | static int make_hdr (int, int, unsigned, unsigned, unsigned, char *, char *); |
135 | static void mark_x (char *); | |
136 | static int copy_text_and_data (int); | |
137 | static int copy_sym (int, int, char *, char *); | |
138 | static void write_segment (int, char *, char *); | |
4e3a36cd JB |
139 | \f |
140 | /* **************************************************************** | |
141 | * unexec | |
142 | * | |
143 | * driving logic. | |
144 | */ | |
0248680a | 145 | int unexec (char *new_name, char *a_name, |
c31d7cc9 GM |
146 | unsigned data_start, |
147 | unsigned bss_start, | |
148 | unsigned entry_address) | |
76998edb | 149 | { |
0248680a | 150 | int new = -1, a_out = -1; |
4e3a36cd | 151 | |
0248680a | 152 | if (a_name && (a_out = open (a_name, O_RDONLY)) < 0) |
4e3a36cd JB |
153 | { |
154 | PERROR (a_name); | |
155 | } | |
156 | if ((new = creat (new_name, 0666)) < 0) | |
157 | { | |
158 | PERROR (new_name); | |
159 | } | |
0248680a DL |
160 | if (make_hdr (new, a_out, |
161 | data_start, bss_start, | |
162 | entry_address, | |
163 | a_name, new_name) < 0 | |
4e3a36cd JB |
164 | || copy_text_and_data (new) < 0 |
165 | || copy_sym (new, a_out, a_name, new_name) < 0 | |
4e3a36cd | 166 | || adjust_lnnoptrs (new, a_out, new_name) < 0 |
0248680a | 167 | || unrelocate_symbols (new, a_out, a_name, new_name) < 0) |
76998edb | 168 | { |
4e3a36cd | 169 | close (new); |
177c0ea7 | 170 | return -1; |
76998edb | 171 | } |
76998edb | 172 | |
4e3a36cd JB |
173 | close (new); |
174 | if (a_out >= 0) | |
175 | close (a_out); | |
176 | mark_x (new_name); | |
177 | return 0; | |
178 | } | |
179 | ||
180 | /* **************************************************************** | |
181 | * make_hdr | |
182 | * | |
183 | * Make the header in the new a.out from the header in core. | |
184 | * Modify the text and data sizes. | |
185 | */ | |
186 | static int | |
0248680a DL |
187 | make_hdr (int new, int a_out, |
188 | unsigned data_start, unsigned bss_start, | |
189 | unsigned entry_address, | |
190 | char *a_name, char *new_name) | |
4e3a36cd | 191 | { |
0248680a | 192 | int scns; |
4e3a36cd JB |
193 | unsigned int bss_end; |
194 | ||
195 | struct scnhdr section[MAX_SECTIONS]; | |
196 | struct scnhdr * f_thdr; /* Text section header */ | |
197 | struct scnhdr * f_dhdr; /* Data section header */ | |
198 | struct scnhdr * f_bhdr; /* Bss section header */ | |
199 | struct scnhdr * f_lhdr; /* Loader section header */ | |
200 | struct scnhdr * f_tchdr; /* Typechk section header */ | |
201 | struct scnhdr * f_dbhdr; /* Debug section header */ | |
202 | struct scnhdr * f_xhdr; /* Except section header */ | |
203 | ||
204 | load_scnptr = orig_load_scnptr = lnnoptr = 0; | |
205 | pagemask = getpagesize () - 1; | |
206 | ||
207 | /* Adjust text/data boundary. */ | |
4e3a36cd | 208 | data_start = (long) start_of_data (); |
4e3a36cd JB |
209 | data_start = ADDR_CORRECT (data_start); |
210 | ||
4e3a36cd | 211 | data_start = data_start & ~pagemask; /* (Down) to page boundary. */ |
4e3a36cd JB |
212 | |
213 | bss_end = ADDR_CORRECT (sbrk (0)) + pagemask; | |
214 | bss_end &= ~ pagemask; | |
215 | /* Adjust data/bss boundary. */ | |
216 | if (bss_start != 0) | |
76998edb | 217 | { |
4e3a36cd JB |
218 | bss_start = (ADDR_CORRECT (bss_start) + pagemask); |
219 | /* (Up) to page bdry. */ | |
220 | bss_start &= ~ pagemask; | |
221 | if (bss_start > bss_end) | |
76998edb | 222 | { |
4e3a36cd JB |
223 | ERROR1 ("unexec: Specified bss_start (%u) is past end of program", |
224 | bss_start); | |
76998edb | 225 | } |
76998edb | 226 | } |
4e3a36cd JB |
227 | else |
228 | bss_start = bss_end; | |
76998edb | 229 | |
4e3a36cd JB |
230 | if (data_start > bss_start) /* Can't have negative data size. */ |
231 | { | |
232 | ERROR2 ("unexec: data_start (%u) can't be greater than bss_start (%u)", | |
233 | data_start, bss_start); | |
234 | } | |
76998edb | 235 | |
4e3a36cd | 236 | /* Salvage as much info from the existing file as possible */ |
4e3a36cd JB |
237 | f_thdr = NULL; f_dhdr = NULL; f_bhdr = NULL; |
238 | f_lhdr = NULL; f_tchdr = NULL; f_dbhdr = NULL; f_xhdr = NULL; | |
239 | if (a_out >= 0) | |
76998edb | 240 | { |
4e3a36cd JB |
241 | if (read (a_out, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) |
242 | { | |
243 | PERROR (a_name); | |
244 | } | |
4e3a36cd JB |
245 | if (f_hdr.f_opthdr > 0) |
246 | { | |
247 | if (read (a_out, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) | |
248 | { | |
249 | PERROR (a_name); | |
250 | } | |
4e3a36cd JB |
251 | } |
252 | if (f_hdr.f_nscns > MAX_SECTIONS) | |
253 | { | |
254 | ERROR0 ("unexec: too many section headers -- increase MAX_SECTIONS"); | |
255 | } | |
256 | /* Loop through section headers */ | |
257 | for (scns = 0; scns < f_hdr.f_nscns; scns++) { | |
258 | struct scnhdr *s = §ion[scns]; | |
259 | if (read (a_out, s, sizeof (*s)) != sizeof (*s)) | |
260 | { | |
261 | PERROR (a_name); | |
262 | } | |
4e3a36cd JB |
263 | |
264 | #define CHECK_SCNHDR(ptr, name, flags) \ | |
265 | if (strcmp(s->s_name, name) == 0) { \ | |
266 | if (s->s_flags != flags) { \ | |
d63c1903 KH |
267 | fprintf(stderr, "unexec: %lx flags where %x expected in %s section.\n", \ |
268 | (unsigned long)s->s_flags, flags, name); \ | |
4e3a36cd JB |
269 | } \ |
270 | if (ptr) { \ | |
271 | fprintf(stderr, "unexec: duplicate section header for section %s.\n", \ | |
272 | name); \ | |
273 | } \ | |
274 | ptr = s; \ | |
275 | } | |
276 | CHECK_SCNHDR(f_thdr, _TEXT, STYP_TEXT); | |
277 | CHECK_SCNHDR(f_dhdr, _DATA, STYP_DATA); | |
278 | CHECK_SCNHDR(f_bhdr, _BSS, STYP_BSS); | |
279 | CHECK_SCNHDR(f_lhdr, _LOADER, STYP_LOADER); | |
280 | CHECK_SCNHDR(f_dbhdr, _DEBUG, STYP_DEBUG); | |
281 | CHECK_SCNHDR(f_tchdr, _TYPCHK, STYP_TYPCHK); | |
282 | CHECK_SCNHDR(f_xhdr, _EXCEPT, STYP_EXCEPT); | |
283 | } | |
284 | ||
285 | if (f_thdr == 0) | |
286 | { | |
0248680a | 287 | ERROR1 ("unexec: couldn't find \"%s\" section", (int) _TEXT); |
4e3a36cd JB |
288 | } |
289 | if (f_dhdr == 0) | |
290 | { | |
0248680a | 291 | ERROR1 ("unexec: couldn't find \"%s\" section", (int) _DATA); |
4e3a36cd JB |
292 | } |
293 | if (f_bhdr == 0) | |
294 | { | |
0248680a | 295 | ERROR1 ("unexec: couldn't find \"%s\" section", (int) _BSS); |
4e3a36cd | 296 | } |
76998edb | 297 | } |
4e3a36cd | 298 | else |
76998edb | 299 | { |
4e3a36cd | 300 | ERROR0 ("can't build a COFF file from scratch yet"); |
76998edb | 301 | } |
4e3a36cd JB |
302 | orig_data_scnptr = f_dhdr->s_scnptr; |
303 | orig_load_scnptr = f_lhdr ? f_lhdr->s_scnptr : 0; | |
304 | ||
305 | /* Now we alter the contents of all the f_*hdr variables | |
306 | to correspond to what we want to dump. */ | |
4a438fc5 RS |
307 | |
308 | /* Indicate that the reloc information is no longer valid for ld (bind); | |
309 | we only update it enough to fake out the exec-time loader. */ | |
310 | f_hdr.f_flags |= (F_RELFLG | F_EXEC); | |
311 | ||
0248680a | 312 | f_ohdr.dsize = bss_start - f_ohdr.data_start; |
4e3a36cd JB |
313 | f_ohdr.bsize = bss_end - bss_start; |
314 | ||
315 | f_dhdr->s_size = f_ohdr.dsize; | |
316 | f_bhdr->s_size = f_ohdr.bsize; | |
4a438fc5 RS |
317 | f_bhdr->s_paddr = f_ohdr.data_start + f_ohdr.dsize; |
318 | f_bhdr->s_vaddr = f_ohdr.data_start + f_ohdr.dsize; | |
4e3a36cd JB |
319 | |
320 | /* fix scnptr's */ | |
321 | { | |
4a438fc5 | 322 | ulong ptr = section[0].s_scnptr; |
4e3a36cd | 323 | |
4a438fc5 RS |
324 | bias = -1; |
325 | for (scns = 0; scns < f_hdr.f_nscns; scns++) | |
326 | { | |
327 | struct scnhdr *s = §ion[scns]; | |
4e3a36cd | 328 | |
4a438fc5 RS |
329 | if (s->s_flags & STYP_PAD) /* .pad sections omitted in AIX 4.1 */ |
330 | { | |
331 | /* | |
332 | * the text_start should probably be o_algntext but that doesn't | |
333 | * seem to change | |
334 | */ | |
335 | if (f_ohdr.text_start != 0) /* && scns != 0 */ | |
336 | { | |
337 | s->s_size = 512 - (ptr % 512); | |
338 | if (s->s_size == 512) | |
339 | s->s_size = 0; | |
340 | } | |
341 | s->s_scnptr = ptr; | |
342 | } | |
343 | else if (s->s_flags & STYP_DATA) | |
4e3a36cd | 344 | s->s_scnptr = ptr; |
4a438fc5 RS |
345 | else if (!(s->s_flags & (STYP_TEXT | STYP_BSS))) |
346 | { | |
347 | if (bias == -1) /* if first section after bss */ | |
348 | bias = ptr - s->s_scnptr; | |
4e3a36cd | 349 | |
4a438fc5 RS |
350 | s->s_scnptr += bias; |
351 | ptr = s->s_scnptr; | |
352 | } | |
177c0ea7 | 353 | |
4a438fc5 RS |
354 | ptr = ptr + s->s_size; |
355 | } | |
4e3a36cd JB |
356 | } |
357 | ||
358 | /* fix other pointers */ | |
4a438fc5 RS |
359 | for (scns = 0; scns < f_hdr.f_nscns; scns++) |
360 | { | |
361 | struct scnhdr *s = §ion[scns]; | |
4e3a36cd | 362 | |
4a438fc5 RS |
363 | if (s->s_relptr != 0) |
364 | { | |
365 | s->s_relptr += bias; | |
366 | } | |
367 | if (s->s_lnnoptr != 0) | |
368 | { | |
369 | if (lnnoptr == 0) lnnoptr = s->s_lnnoptr; | |
370 | s->s_lnnoptr += bias; | |
371 | } | |
372 | } | |
4e3a36cd JB |
373 | |
374 | if (f_hdr.f_symptr > 0L) | |
76998edb | 375 | { |
4e3a36cd | 376 | f_hdr.f_symptr += bias; |
76998edb JB |
377 | } |
378 | ||
4e3a36cd JB |
379 | text_scnptr = f_thdr->s_scnptr; |
380 | data_scnptr = f_dhdr->s_scnptr; | |
381 | load_scnptr = f_lhdr ? f_lhdr->s_scnptr : 0; | |
76998edb | 382 | |
4e3a36cd JB |
383 | if (write (new, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) |
384 | { | |
385 | PERROR (new_name); | |
386 | } | |
76998edb | 387 | |
4e3a36cd JB |
388 | if (f_hdr.f_opthdr > 0) |
389 | { | |
390 | if (write (new, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) | |
76998edb | 391 | { |
4e3a36cd JB |
392 | PERROR (new_name); |
393 | } | |
394 | } | |
76998edb | 395 | |
4e3a36cd JB |
396 | for (scns = 0; scns < f_hdr.f_nscns; scns++) { |
397 | struct scnhdr *s = §ion[scns]; | |
398 | if (write (new, s, sizeof (*s)) != sizeof (*s)) | |
399 | { | |
400 | PERROR (new_name); | |
401 | } | |
402 | } | |
76998edb | 403 | |
4e3a36cd | 404 | return (0); |
4e3a36cd JB |
405 | } |
406 | \f | |
407 | /* **************************************************************** | |
177c0ea7 | 408 | |
4e3a36cd JB |
409 | * |
410 | * Copy the text and data segments from memory to the new a.out | |
411 | */ | |
412 | static int | |
0248680a | 413 | copy_text_and_data (int new) |
4e3a36cd | 414 | { |
0248680a DL |
415 | char *end; |
416 | char *ptr; | |
4e3a36cd | 417 | |
0248680a | 418 | lseek (new, (long) text_scnptr, SEEK_SET); |
4e3a36cd JB |
419 | ptr = start_of_text () + text_scnptr; |
420 | end = ptr + f_ohdr.tsize; | |
421 | write_segment (new, ptr, end); | |
422 | ||
0248680a DL |
423 | lseek (new, (long) data_scnptr, SEEK_SET); |
424 | ptr = (char *) f_ohdr.data_start; | |
4e3a36cd JB |
425 | end = ptr + f_ohdr.dsize; |
426 | write_segment (new, ptr, end); | |
427 | ||
428 | return 0; | |
429 | } | |
430 | ||
91b97ddb | 431 | #define UnexBlockSz (1<<12) /* read/write block size */ |
0248680a DL |
432 | static void |
433 | write_segment (int new, char *ptr, char *end) | |
4e3a36cd | 434 | { |
0248680a | 435 | int i, nwrite, ret; |
4e3a36cd JB |
436 | char buf[80]; |
437 | extern int errno; | |
91b97ddb | 438 | char zeros[UnexBlockSz]; |
4e3a36cd JB |
439 | |
440 | for (i = 0; ptr < end;) | |
441 | { | |
91b97ddb RS |
442 | /* distance to next block. */ |
443 | nwrite = (((int) ptr + UnexBlockSz) & -UnexBlockSz) - (int) ptr; | |
4e3a36cd JB |
444 | /* But not beyond specified end. */ |
445 | if (nwrite > end - ptr) nwrite = end - ptr; | |
446 | ret = write (new, ptr, nwrite); | |
447 | /* If write gets a page fault, it means we reached | |
448 | a gap between the old text segment and the old data segment. | |
449 | This gap has probably been remapped into part of the text segment. | |
450 | So write zeros for it. */ | |
451 | if (ret == -1 && errno == EFAULT) | |
76998edb | 452 | { |
0248680a | 453 | memset (zeros, 0, nwrite); |
91b97ddb | 454 | write (new, zeros, nwrite); |
76998edb | 455 | } |
4e3a36cd | 456 | else if (nwrite != ret) |
76998edb | 457 | { |
4e3a36cd | 458 | sprintf (buf, |
d63c1903 KH |
459 | "unexec write failure: addr 0x%lx, fileno %d, size 0x%x, wrote 0x%x, errno %d", |
460 | (unsigned long)ptr, new, nwrite, ret, errno); | |
4e3a36cd | 461 | PERROR (buf); |
76998edb | 462 | } |
4e3a36cd JB |
463 | i += nwrite; |
464 | ptr += nwrite; | |
465 | } | |
466 | } | |
467 | \f | |
468 | /* **************************************************************** | |
469 | * copy_sym | |
470 | * | |
471 | * Copy the relocation information and symbol table from the a.out to the new | |
472 | */ | |
473 | static int | |
0248680a | 474 | copy_sym (int new, int a_out, char *a_name, char *new_name) |
4e3a36cd | 475 | { |
91b97ddb | 476 | char page[UnexBlockSz]; |
4e3a36cd | 477 | int n; |
76998edb | 478 | |
4e3a36cd JB |
479 | if (a_out < 0) |
480 | return 0; | |
76998edb | 481 | |
4a438fc5 | 482 | if (orig_load_scnptr == 0L) |
4e3a36cd | 483 | return 0; |
76998edb | 484 | |
4a438fc5 | 485 | if (lnnoptr && lnnoptr < orig_load_scnptr) /* if there is line number info */ |
0248680a | 486 | lseek (a_out, lnnoptr, SEEK_SET); /* start copying from there */ |
4e3a36cd | 487 | else |
0248680a | 488 | lseek (a_out, orig_load_scnptr, SEEK_SET); /* Position a.out to symtab. */ |
4e3a36cd JB |
489 | |
490 | while ((n = read (a_out, page, sizeof page)) > 0) | |
491 | { | |
492 | if (write (new, page, n) != n) | |
76998edb | 493 | { |
4e3a36cd | 494 | PERROR (new_name); |
76998edb JB |
495 | } |
496 | } | |
4e3a36cd JB |
497 | if (n < 0) |
498 | { | |
499 | PERROR (a_name); | |
500 | } | |
501 | return 0; | |
502 | } | |
503 | \f | |
504 | /* **************************************************************** | |
505 | * mark_x | |
506 | * | |
eb8c3be9 | 507 | * After successfully building the new a.out, mark it executable |
4e3a36cd JB |
508 | */ |
509 | static void | |
0248680a | 510 | mark_x (char *name) |
4e3a36cd JB |
511 | { |
512 | struct stat sbuf; | |
513 | int um; | |
514 | int new = 0; /* for PERROR */ | |
76998edb | 515 | |
4e3a36cd JB |
516 | um = umask (777); |
517 | umask (um); | |
518 | if (stat (name, &sbuf) == -1) | |
519 | { | |
520 | PERROR (name); | |
521 | } | |
522 | sbuf.st_mode |= 0111 & ~um; | |
523 | if (chmod (name, sbuf.st_mode) == -1) | |
524 | PERROR (name); | |
525 | } | |
526 | \f | |
0248680a DL |
527 | static int |
528 | adjust_lnnoptrs (int writedesc, int readdesc, char *new_name) | |
4e3a36cd | 529 | { |
0248680a DL |
530 | int nsyms; |
531 | int naux; | |
532 | int new; | |
4e3a36cd JB |
533 | struct syment symentry; |
534 | union auxent auxentry; | |
4e3a36cd JB |
535 | |
536 | if (!lnnoptr || !f_hdr.f_symptr) | |
537 | return 0; | |
538 | ||
0248680a | 539 | if ((new = open (new_name, O_RDWR)) < 0) |
4e3a36cd JB |
540 | { |
541 | PERROR (new_name); | |
542 | return -1; | |
543 | } | |
544 | ||
0248680a | 545 | lseek (new, f_hdr.f_symptr, SEEK_SET); |
4e3a36cd JB |
546 | for (nsyms = 0; nsyms < f_hdr.f_nsyms; nsyms++) |
547 | { | |
548 | read (new, &symentry, SYMESZ); | |
91b97ddb RS |
549 | if (symentry.n_sclass == C_BINCL || symentry.n_sclass == C_EINCL) |
550 | { | |
551 | symentry.n_value += bias; | |
0248680a | 552 | lseek (new, -SYMESZ, SEEK_CUR); |
91b97ddb RS |
553 | write (new, &symentry, SYMESZ); |
554 | } | |
555 | ||
4a438fc5 | 556 | for (naux = symentry.n_numaux; naux-- != 0; ) |
4e3a36cd JB |
557 | { |
558 | read (new, &auxentry, AUXESZ); | |
559 | nsyms++; | |
4a438fc5 RS |
560 | if (naux != 0 /* skip csect auxentry (last entry) */ |
561 | && (symentry.n_sclass == C_EXT || symentry.n_sclass == C_HIDEXT)) | |
562 | { | |
563 | auxentry.x_sym.x_fcnary.x_fcn.x_lnnoptr += bias; | |
0248680a | 564 | lseek (new, -AUXESZ, SEEK_CUR); |
4a438fc5 RS |
565 | write (new, &auxentry, AUXESZ); |
566 | } | |
4e3a36cd JB |
567 | } |
568 | } | |
569 | close (new); | |
76998edb | 570 | |
0248680a DL |
571 | return 0; |
572 | } | |
4e3a36cd | 573 | |
0248680a DL |
574 | static int |
575 | unrelocate_symbols (int new, int a_out, char *a_name, char *new_name) | |
76998edb | 576 | { |
0248680a | 577 | int i; |
4e3a36cd | 578 | LDHDR ldhdr; |
0248680a | 579 | LDREL ldrel; |
4a438fc5 | 580 | ulong t_reloc = (ulong) &_text - f_ohdr.text_start; |
0248680a DL |
581 | #ifndef ALIGN_DATA_RELOC |
582 | ulong d_reloc = (ulong) &_data - f_ohdr.data_start; | |
583 | #else | |
177c0ea7 | 584 | /* This worked (and was needed) before AIX 4.2. |
0248680a | 585 | I have no idea why. -- Mike */ |
4a438fc5 | 586 | ulong d_reloc = (ulong) &_data - ALIGN(f_ohdr.data_start, 2); |
0248680a | 587 | #endif |
4e3a36cd | 588 | int * p; |
4e3a36cd JB |
589 | |
590 | if (load_scnptr == 0) | |
591 | return 0; | |
592 | ||
0248680a | 593 | lseek (a_out, orig_load_scnptr, SEEK_SET); |
4e3a36cd JB |
594 | if (read (a_out, &ldhdr, sizeof (ldhdr)) != sizeof (ldhdr)) |
595 | { | |
596 | PERROR (new_name); | |
597 | } | |
598 | ||
599 | #define SYMNDX_TEXT 0 | |
600 | #define SYMNDX_DATA 1 | |
601 | #define SYMNDX_BSS 2 | |
4e3a36cd | 602 | |
0248680a DL |
603 | for (i = 0; i < ldhdr.l_nreloc; i++) |
604 | { | |
605 | lseek (a_out, | |
606 | orig_load_scnptr + LDHDRSZ + LDSYMSZ*ldhdr.l_nsyms + LDRELSZ*i, | |
607 | SEEK_SET); | |
4e3a36cd | 608 | |
0248680a DL |
609 | if (read (a_out, &ldrel, LDRELSZ) != LDRELSZ) |
610 | { | |
611 | PERROR (a_name); | |
612 | } | |
4e3a36cd JB |
613 | |
614 | /* move the BSS loader symbols to the DATA segment */ | |
0248680a | 615 | if (ldrel.l_symndx == SYMNDX_BSS) |
4e3a36cd | 616 | { |
0248680a | 617 | ldrel.l_symndx = SYMNDX_DATA; |
91b97ddb | 618 | |
4e3a36cd JB |
619 | lseek (new, |
620 | load_scnptr + LDHDRSZ + LDSYMSZ*ldhdr.l_nsyms + LDRELSZ*i, | |
0248680a | 621 | SEEK_SET); |
4e3a36cd | 622 | |
0248680a | 623 | if (write (new, &ldrel, LDRELSZ) != LDRELSZ) |
4e3a36cd JB |
624 | { |
625 | PERROR (new_name); | |
626 | } | |
627 | } | |
628 | ||
0248680a | 629 | if (ldrel.l_rsecnm == f_ohdr.o_sndata) |
4e3a36cd JB |
630 | { |
631 | int orig_int; | |
632 | ||
4a438fc5 | 633 | lseek (a_out, |
0248680a DL |
634 | orig_data_scnptr + (ldrel.l_vaddr - f_ohdr.data_start), |
635 | SEEK_SET); | |
4e3a36cd | 636 | |
0248680a DL |
637 | if (read (a_out, (void *) &orig_int, sizeof (orig_int)) |
638 | != sizeof (orig_int)) | |
4e3a36cd JB |
639 | { |
640 | PERROR (a_name); | |
641 | } | |
642 | ||
0248680a | 643 | p = (int *) (ldrel.l_vaddr + d_reloc); |
4a438fc5 | 644 | |
0248680a | 645 | switch (ldrel.l_symndx) { |
4e3a36cd | 646 | case SYMNDX_TEXT: |
4a438fc5 | 647 | orig_int = * p - t_reloc; |
4e3a36cd JB |
648 | break; |
649 | ||
650 | case SYMNDX_DATA: | |
651 | case SYMNDX_BSS: | |
4a438fc5 | 652 | orig_int = * p - d_reloc; |
4e3a36cd JB |
653 | break; |
654 | } | |
655 | ||
4a438fc5 RS |
656 | if (orig_int != * p) |
657 | { | |
658 | lseek (new, | |
0248680a DL |
659 | data_scnptr + (ldrel.l_vaddr - f_ohdr.data_start), |
660 | SEEK_SET); | |
4a438fc5 RS |
661 | if (write (new, (void *) &orig_int, sizeof (orig_int)) |
662 | != sizeof (orig_int)) | |
663 | { | |
664 | PERROR (new_name); | |
665 | } | |
666 | } | |
4e3a36cd JB |
667 | } |
668 | } | |
0248680a | 669 | return 0; |
76998edb | 670 | } |
ab5796a9 MB |
671 | |
672 | /* arch-tag: 0783857a-7c2d-456f-a426-58b722d69fd0 | |
673 | (do not change this comment) */ |