Commit | Line | Data |
---|---|---|
0248680a DL |
1 | /* Dump an executable image. |
2 | Copyright (C) 1985, 1986, 1987, 1988, 1999 Free Software Foundation, Inc. | |
4e3a36cd | 3 | |
3b7ad313 EN |
4 | This file is part of GNU Emacs. |
5 | ||
6 | GNU Emacs is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2, or (at your option) | |
9 | any later version. | |
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 | |
17 | along with GNU Emacs; see the file COPYING. If not, write to | |
18 | the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
19 | Boston, MA 02111-1307, USA. | |
4e3a36cd JB |
20 | |
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 | ||
106 | /* Correct an int which is the bit pattern of a pointer to a byte | |
107 | into an int which is the number of a byte. | |
108 | This is a no-op on ordinary machines, but not on all. */ | |
109 | ||
110 | #ifndef ADDR_CORRECT /* Let m-*.h files override this definition */ | |
111 | #define ADDR_CORRECT(x) ((char *)(x) - (char*)0) | |
112 | #endif | |
113 | ||
114 | #ifdef emacs | |
8eca17c9 | 115 | #include "lisp.h" |
4e3a36cd | 116 | |
0248680a DL |
117 | static void |
118 | report_error (char *file, int fd) | |
4e3a36cd JB |
119 | { |
120 | if (fd) | |
121 | close (fd); | |
8eca17c9 | 122 | report_file_error ("Cannot unexec", Fcons (build_string (file), Qnil)); |
4e3a36cd JB |
123 | } |
124 | #endif /* emacs */ | |
76998edb | 125 | |
4e3a36cd JB |
126 | #define ERROR0(msg) report_error_1 (new, msg, 0, 0); return -1 |
127 | #define ERROR1(msg,x) report_error_1 (new, msg, x, 0); return -1 | |
128 | #define ERROR2(msg,x,y) report_error_1 (new, msg, x, y); return -1 | |
76998edb | 129 | |
0248680a DL |
130 | static void |
131 | report_error_1 (int fd, char *msg, int a1, int a2) | |
76998edb | 132 | { |
4e3a36cd JB |
133 | close (fd); |
134 | #ifdef emacs | |
135 | error (msg, a1, a2); | |
136 | #else | |
137 | fprintf (stderr, msg, a1, a2); | |
138 | fprintf (stderr, "\n"); | |
139 | #endif | |
140 | } | |
141 | ||
0248680a DL |
142 | static int make_hdr (int, int, unsigned, unsigned, unsigned, char *, char *); |
143 | static void mark_x (char *); | |
144 | static int copy_text_and_data (int); | |
145 | static int copy_sym (int, int, char *, char *); | |
146 | static void write_segment (int, char *, char *); | |
4e3a36cd JB |
147 | \f |
148 | /* **************************************************************** | |
149 | * unexec | |
150 | * | |
151 | * driving logic. | |
152 | */ | |
0248680a | 153 | int unexec (char *new_name, char *a_name, |
c31d7cc9 GM |
154 | unsigned data_start, |
155 | unsigned bss_start, | |
156 | unsigned entry_address) | |
76998edb | 157 | { |
0248680a | 158 | int new = -1, a_out = -1; |
4e3a36cd | 159 | |
0248680a | 160 | if (a_name && (a_out = open (a_name, O_RDONLY)) < 0) |
4e3a36cd JB |
161 | { |
162 | PERROR (a_name); | |
163 | } | |
164 | if ((new = creat (new_name, 0666)) < 0) | |
165 | { | |
166 | PERROR (new_name); | |
167 | } | |
0248680a DL |
168 | if (make_hdr (new, a_out, |
169 | data_start, bss_start, | |
170 | entry_address, | |
171 | a_name, new_name) < 0 | |
4e3a36cd JB |
172 | || copy_text_and_data (new) < 0 |
173 | || copy_sym (new, a_out, a_name, new_name) < 0 | |
4e3a36cd | 174 | || adjust_lnnoptrs (new, a_out, new_name) < 0 |
0248680a | 175 | || unrelocate_symbols (new, a_out, a_name, new_name) < 0) |
76998edb | 176 | { |
4e3a36cd | 177 | close (new); |
177c0ea7 | 178 | return -1; |
76998edb | 179 | } |
76998edb | 180 | |
4e3a36cd JB |
181 | close (new); |
182 | if (a_out >= 0) | |
183 | close (a_out); | |
184 | mark_x (new_name); | |
185 | return 0; | |
186 | } | |
187 | ||
188 | /* **************************************************************** | |
189 | * make_hdr | |
190 | * | |
191 | * Make the header in the new a.out from the header in core. | |
192 | * Modify the text and data sizes. | |
193 | */ | |
194 | static int | |
0248680a DL |
195 | make_hdr (int new, int a_out, |
196 | unsigned data_start, unsigned bss_start, | |
197 | unsigned entry_address, | |
198 | char *a_name, char *new_name) | |
4e3a36cd | 199 | { |
0248680a | 200 | int scns; |
4e3a36cd JB |
201 | unsigned int bss_end; |
202 | ||
203 | struct scnhdr section[MAX_SECTIONS]; | |
204 | struct scnhdr * f_thdr; /* Text section header */ | |
205 | struct scnhdr * f_dhdr; /* Data section header */ | |
206 | struct scnhdr * f_bhdr; /* Bss section header */ | |
207 | struct scnhdr * f_lhdr; /* Loader section header */ | |
208 | struct scnhdr * f_tchdr; /* Typechk section header */ | |
209 | struct scnhdr * f_dbhdr; /* Debug section header */ | |
210 | struct scnhdr * f_xhdr; /* Except section header */ | |
211 | ||
212 | load_scnptr = orig_load_scnptr = lnnoptr = 0; | |
213 | pagemask = getpagesize () - 1; | |
214 | ||
215 | /* Adjust text/data boundary. */ | |
4e3a36cd | 216 | data_start = (long) start_of_data (); |
4e3a36cd JB |
217 | data_start = ADDR_CORRECT (data_start); |
218 | ||
4e3a36cd | 219 | data_start = data_start & ~pagemask; /* (Down) to page boundary. */ |
4e3a36cd JB |
220 | |
221 | bss_end = ADDR_CORRECT (sbrk (0)) + pagemask; | |
222 | bss_end &= ~ pagemask; | |
223 | /* Adjust data/bss boundary. */ | |
224 | if (bss_start != 0) | |
76998edb | 225 | { |
4e3a36cd JB |
226 | bss_start = (ADDR_CORRECT (bss_start) + pagemask); |
227 | /* (Up) to page bdry. */ | |
228 | bss_start &= ~ pagemask; | |
229 | if (bss_start > bss_end) | |
76998edb | 230 | { |
4e3a36cd JB |
231 | ERROR1 ("unexec: Specified bss_start (%u) is past end of program", |
232 | bss_start); | |
76998edb | 233 | } |
76998edb | 234 | } |
4e3a36cd JB |
235 | else |
236 | bss_start = bss_end; | |
76998edb | 237 | |
4e3a36cd JB |
238 | if (data_start > bss_start) /* Can't have negative data size. */ |
239 | { | |
240 | ERROR2 ("unexec: data_start (%u) can't be greater than bss_start (%u)", | |
241 | data_start, bss_start); | |
242 | } | |
76998edb | 243 | |
4e3a36cd | 244 | /* Salvage as much info from the existing file as possible */ |
4e3a36cd JB |
245 | f_thdr = NULL; f_dhdr = NULL; f_bhdr = NULL; |
246 | f_lhdr = NULL; f_tchdr = NULL; f_dbhdr = NULL; f_xhdr = NULL; | |
247 | if (a_out >= 0) | |
76998edb | 248 | { |
4e3a36cd JB |
249 | if (read (a_out, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) |
250 | { | |
251 | PERROR (a_name); | |
252 | } | |
4e3a36cd JB |
253 | if (f_hdr.f_opthdr > 0) |
254 | { | |
255 | if (read (a_out, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) | |
256 | { | |
257 | PERROR (a_name); | |
258 | } | |
4e3a36cd JB |
259 | } |
260 | if (f_hdr.f_nscns > MAX_SECTIONS) | |
261 | { | |
262 | ERROR0 ("unexec: too many section headers -- increase MAX_SECTIONS"); | |
263 | } | |
264 | /* Loop through section headers */ | |
265 | for (scns = 0; scns < f_hdr.f_nscns; scns++) { | |
266 | struct scnhdr *s = §ion[scns]; | |
267 | if (read (a_out, s, sizeof (*s)) != sizeof (*s)) | |
268 | { | |
269 | PERROR (a_name); | |
270 | } | |
4e3a36cd JB |
271 | |
272 | #define CHECK_SCNHDR(ptr, name, flags) \ | |
273 | if (strcmp(s->s_name, name) == 0) { \ | |
274 | if (s->s_flags != flags) { \ | |
d63c1903 KH |
275 | fprintf(stderr, "unexec: %lx flags where %x expected in %s section.\n", \ |
276 | (unsigned long)s->s_flags, flags, name); \ | |
4e3a36cd JB |
277 | } \ |
278 | if (ptr) { \ | |
279 | fprintf(stderr, "unexec: duplicate section header for section %s.\n", \ | |
280 | name); \ | |
281 | } \ | |
282 | ptr = s; \ | |
283 | } | |
284 | CHECK_SCNHDR(f_thdr, _TEXT, STYP_TEXT); | |
285 | CHECK_SCNHDR(f_dhdr, _DATA, STYP_DATA); | |
286 | CHECK_SCNHDR(f_bhdr, _BSS, STYP_BSS); | |
287 | CHECK_SCNHDR(f_lhdr, _LOADER, STYP_LOADER); | |
288 | CHECK_SCNHDR(f_dbhdr, _DEBUG, STYP_DEBUG); | |
289 | CHECK_SCNHDR(f_tchdr, _TYPCHK, STYP_TYPCHK); | |
290 | CHECK_SCNHDR(f_xhdr, _EXCEPT, STYP_EXCEPT); | |
291 | } | |
292 | ||
293 | if (f_thdr == 0) | |
294 | { | |
0248680a | 295 | ERROR1 ("unexec: couldn't find \"%s\" section", (int) _TEXT); |
4e3a36cd JB |
296 | } |
297 | if (f_dhdr == 0) | |
298 | { | |
0248680a | 299 | ERROR1 ("unexec: couldn't find \"%s\" section", (int) _DATA); |
4e3a36cd JB |
300 | } |
301 | if (f_bhdr == 0) | |
302 | { | |
0248680a | 303 | ERROR1 ("unexec: couldn't find \"%s\" section", (int) _BSS); |
4e3a36cd | 304 | } |
76998edb | 305 | } |
4e3a36cd | 306 | else |
76998edb | 307 | { |
4e3a36cd | 308 | ERROR0 ("can't build a COFF file from scratch yet"); |
76998edb | 309 | } |
4e3a36cd JB |
310 | orig_data_scnptr = f_dhdr->s_scnptr; |
311 | orig_load_scnptr = f_lhdr ? f_lhdr->s_scnptr : 0; | |
312 | ||
313 | /* Now we alter the contents of all the f_*hdr variables | |
314 | to correspond to what we want to dump. */ | |
4a438fc5 RS |
315 | |
316 | /* Indicate that the reloc information is no longer valid for ld (bind); | |
317 | we only update it enough to fake out the exec-time loader. */ | |
318 | f_hdr.f_flags |= (F_RELFLG | F_EXEC); | |
319 | ||
0248680a | 320 | f_ohdr.dsize = bss_start - f_ohdr.data_start; |
4e3a36cd JB |
321 | f_ohdr.bsize = bss_end - bss_start; |
322 | ||
323 | f_dhdr->s_size = f_ohdr.dsize; | |
324 | f_bhdr->s_size = f_ohdr.bsize; | |
4a438fc5 RS |
325 | f_bhdr->s_paddr = f_ohdr.data_start + f_ohdr.dsize; |
326 | f_bhdr->s_vaddr = f_ohdr.data_start + f_ohdr.dsize; | |
4e3a36cd JB |
327 | |
328 | /* fix scnptr's */ | |
329 | { | |
4a438fc5 | 330 | ulong ptr = section[0].s_scnptr; |
4e3a36cd | 331 | |
4a438fc5 RS |
332 | bias = -1; |
333 | for (scns = 0; scns < f_hdr.f_nscns; scns++) | |
334 | { | |
335 | struct scnhdr *s = §ion[scns]; | |
4e3a36cd | 336 | |
4a438fc5 RS |
337 | if (s->s_flags & STYP_PAD) /* .pad sections omitted in AIX 4.1 */ |
338 | { | |
339 | /* | |
340 | * the text_start should probably be o_algntext but that doesn't | |
341 | * seem to change | |
342 | */ | |
343 | if (f_ohdr.text_start != 0) /* && scns != 0 */ | |
344 | { | |
345 | s->s_size = 512 - (ptr % 512); | |
346 | if (s->s_size == 512) | |
347 | s->s_size = 0; | |
348 | } | |
349 | s->s_scnptr = ptr; | |
350 | } | |
351 | else if (s->s_flags & STYP_DATA) | |
4e3a36cd | 352 | s->s_scnptr = ptr; |
4a438fc5 RS |
353 | else if (!(s->s_flags & (STYP_TEXT | STYP_BSS))) |
354 | { | |
355 | if (bias == -1) /* if first section after bss */ | |
356 | bias = ptr - s->s_scnptr; | |
4e3a36cd | 357 | |
4a438fc5 RS |
358 | s->s_scnptr += bias; |
359 | ptr = s->s_scnptr; | |
360 | } | |
177c0ea7 | 361 | |
4a438fc5 RS |
362 | ptr = ptr + s->s_size; |
363 | } | |
4e3a36cd JB |
364 | } |
365 | ||
366 | /* fix other pointers */ | |
4a438fc5 RS |
367 | for (scns = 0; scns < f_hdr.f_nscns; scns++) |
368 | { | |
369 | struct scnhdr *s = §ion[scns]; | |
4e3a36cd | 370 | |
4a438fc5 RS |
371 | if (s->s_relptr != 0) |
372 | { | |
373 | s->s_relptr += bias; | |
374 | } | |
375 | if (s->s_lnnoptr != 0) | |
376 | { | |
377 | if (lnnoptr == 0) lnnoptr = s->s_lnnoptr; | |
378 | s->s_lnnoptr += bias; | |
379 | } | |
380 | } | |
4e3a36cd JB |
381 | |
382 | if (f_hdr.f_symptr > 0L) | |
76998edb | 383 | { |
4e3a36cd | 384 | f_hdr.f_symptr += bias; |
76998edb JB |
385 | } |
386 | ||
4e3a36cd JB |
387 | text_scnptr = f_thdr->s_scnptr; |
388 | data_scnptr = f_dhdr->s_scnptr; | |
389 | load_scnptr = f_lhdr ? f_lhdr->s_scnptr : 0; | |
76998edb | 390 | |
4e3a36cd JB |
391 | if (write (new, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) |
392 | { | |
393 | PERROR (new_name); | |
394 | } | |
76998edb | 395 | |
4e3a36cd JB |
396 | if (f_hdr.f_opthdr > 0) |
397 | { | |
398 | if (write (new, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) | |
76998edb | 399 | { |
4e3a36cd JB |
400 | PERROR (new_name); |
401 | } | |
402 | } | |
76998edb | 403 | |
4e3a36cd JB |
404 | for (scns = 0; scns < f_hdr.f_nscns; scns++) { |
405 | struct scnhdr *s = §ion[scns]; | |
406 | if (write (new, s, sizeof (*s)) != sizeof (*s)) | |
407 | { | |
408 | PERROR (new_name); | |
409 | } | |
410 | } | |
76998edb | 411 | |
4e3a36cd | 412 | return (0); |
4e3a36cd JB |
413 | } |
414 | \f | |
415 | /* **************************************************************** | |
177c0ea7 | 416 | |
4e3a36cd JB |
417 | * |
418 | * Copy the text and data segments from memory to the new a.out | |
419 | */ | |
420 | static int | |
0248680a | 421 | copy_text_and_data (int new) |
4e3a36cd | 422 | { |
0248680a DL |
423 | char *end; |
424 | char *ptr; | |
4e3a36cd | 425 | |
0248680a | 426 | lseek (new, (long) text_scnptr, SEEK_SET); |
4e3a36cd JB |
427 | ptr = start_of_text () + text_scnptr; |
428 | end = ptr + f_ohdr.tsize; | |
429 | write_segment (new, ptr, end); | |
430 | ||
0248680a DL |
431 | lseek (new, (long) data_scnptr, SEEK_SET); |
432 | ptr = (char *) f_ohdr.data_start; | |
4e3a36cd JB |
433 | end = ptr + f_ohdr.dsize; |
434 | write_segment (new, ptr, end); | |
435 | ||
436 | return 0; | |
437 | } | |
438 | ||
91b97ddb | 439 | #define UnexBlockSz (1<<12) /* read/write block size */ |
0248680a DL |
440 | static void |
441 | write_segment (int new, char *ptr, char *end) | |
4e3a36cd | 442 | { |
0248680a | 443 | int i, nwrite, ret; |
4e3a36cd JB |
444 | char buf[80]; |
445 | extern int errno; | |
91b97ddb | 446 | char zeros[UnexBlockSz]; |
4e3a36cd JB |
447 | |
448 | for (i = 0; ptr < end;) | |
449 | { | |
91b97ddb RS |
450 | /* distance to next block. */ |
451 | nwrite = (((int) ptr + UnexBlockSz) & -UnexBlockSz) - (int) ptr; | |
4e3a36cd JB |
452 | /* But not beyond specified end. */ |
453 | if (nwrite > end - ptr) nwrite = end - ptr; | |
454 | ret = write (new, ptr, nwrite); | |
455 | /* If write gets a page fault, it means we reached | |
456 | a gap between the old text segment and the old data segment. | |
457 | This gap has probably been remapped into part of the text segment. | |
458 | So write zeros for it. */ | |
459 | if (ret == -1 && errno == EFAULT) | |
76998edb | 460 | { |
0248680a | 461 | memset (zeros, 0, nwrite); |
91b97ddb | 462 | write (new, zeros, nwrite); |
76998edb | 463 | } |
4e3a36cd | 464 | else if (nwrite != ret) |
76998edb | 465 | { |
4e3a36cd | 466 | sprintf (buf, |
d63c1903 KH |
467 | "unexec write failure: addr 0x%lx, fileno %d, size 0x%x, wrote 0x%x, errno %d", |
468 | (unsigned long)ptr, new, nwrite, ret, errno); | |
4e3a36cd | 469 | PERROR (buf); |
76998edb | 470 | } |
4e3a36cd JB |
471 | i += nwrite; |
472 | ptr += nwrite; | |
473 | } | |
474 | } | |
475 | \f | |
476 | /* **************************************************************** | |
477 | * copy_sym | |
478 | * | |
479 | * Copy the relocation information and symbol table from the a.out to the new | |
480 | */ | |
481 | static int | |
0248680a | 482 | copy_sym (int new, int a_out, char *a_name, char *new_name) |
4e3a36cd | 483 | { |
91b97ddb | 484 | char page[UnexBlockSz]; |
4e3a36cd | 485 | int n; |
76998edb | 486 | |
4e3a36cd JB |
487 | if (a_out < 0) |
488 | return 0; | |
76998edb | 489 | |
4a438fc5 | 490 | if (orig_load_scnptr == 0L) |
4e3a36cd | 491 | return 0; |
76998edb | 492 | |
4a438fc5 | 493 | if (lnnoptr && lnnoptr < orig_load_scnptr) /* if there is line number info */ |
0248680a | 494 | lseek (a_out, lnnoptr, SEEK_SET); /* start copying from there */ |
4e3a36cd | 495 | else |
0248680a | 496 | lseek (a_out, orig_load_scnptr, SEEK_SET); /* Position a.out to symtab. */ |
4e3a36cd JB |
497 | |
498 | while ((n = read (a_out, page, sizeof page)) > 0) | |
499 | { | |
500 | if (write (new, page, n) != n) | |
76998edb | 501 | { |
4e3a36cd | 502 | PERROR (new_name); |
76998edb JB |
503 | } |
504 | } | |
4e3a36cd JB |
505 | if (n < 0) |
506 | { | |
507 | PERROR (a_name); | |
508 | } | |
509 | return 0; | |
510 | } | |
511 | \f | |
512 | /* **************************************************************** | |
513 | * mark_x | |
514 | * | |
eb8c3be9 | 515 | * After successfully building the new a.out, mark it executable |
4e3a36cd JB |
516 | */ |
517 | static void | |
0248680a | 518 | mark_x (char *name) |
4e3a36cd JB |
519 | { |
520 | struct stat sbuf; | |
521 | int um; | |
522 | int new = 0; /* for PERROR */ | |
76998edb | 523 | |
4e3a36cd JB |
524 | um = umask (777); |
525 | umask (um); | |
526 | if (stat (name, &sbuf) == -1) | |
527 | { | |
528 | PERROR (name); | |
529 | } | |
530 | sbuf.st_mode |= 0111 & ~um; | |
531 | if (chmod (name, sbuf.st_mode) == -1) | |
532 | PERROR (name); | |
533 | } | |
534 | \f | |
0248680a DL |
535 | static int |
536 | adjust_lnnoptrs (int writedesc, int readdesc, char *new_name) | |
4e3a36cd | 537 | { |
0248680a DL |
538 | int nsyms; |
539 | int naux; | |
540 | int new; | |
4e3a36cd JB |
541 | struct syment symentry; |
542 | union auxent auxentry; | |
4e3a36cd JB |
543 | |
544 | if (!lnnoptr || !f_hdr.f_symptr) | |
545 | return 0; | |
546 | ||
0248680a | 547 | if ((new = open (new_name, O_RDWR)) < 0) |
4e3a36cd JB |
548 | { |
549 | PERROR (new_name); | |
550 | return -1; | |
551 | } | |
552 | ||
0248680a | 553 | lseek (new, f_hdr.f_symptr, SEEK_SET); |
4e3a36cd JB |
554 | for (nsyms = 0; nsyms < f_hdr.f_nsyms; nsyms++) |
555 | { | |
556 | read (new, &symentry, SYMESZ); | |
91b97ddb RS |
557 | if (symentry.n_sclass == C_BINCL || symentry.n_sclass == C_EINCL) |
558 | { | |
559 | symentry.n_value += bias; | |
0248680a | 560 | lseek (new, -SYMESZ, SEEK_CUR); |
91b97ddb RS |
561 | write (new, &symentry, SYMESZ); |
562 | } | |
563 | ||
4a438fc5 | 564 | for (naux = symentry.n_numaux; naux-- != 0; ) |
4e3a36cd JB |
565 | { |
566 | read (new, &auxentry, AUXESZ); | |
567 | nsyms++; | |
4a438fc5 RS |
568 | if (naux != 0 /* skip csect auxentry (last entry) */ |
569 | && (symentry.n_sclass == C_EXT || symentry.n_sclass == C_HIDEXT)) | |
570 | { | |
571 | auxentry.x_sym.x_fcnary.x_fcn.x_lnnoptr += bias; | |
0248680a | 572 | lseek (new, -AUXESZ, SEEK_CUR); |
4a438fc5 RS |
573 | write (new, &auxentry, AUXESZ); |
574 | } | |
4e3a36cd JB |
575 | } |
576 | } | |
577 | close (new); | |
76998edb | 578 | |
0248680a DL |
579 | return 0; |
580 | } | |
4e3a36cd | 581 | |
0248680a DL |
582 | static int |
583 | unrelocate_symbols (int new, int a_out, char *a_name, char *new_name) | |
76998edb | 584 | { |
0248680a | 585 | int i; |
4e3a36cd | 586 | LDHDR ldhdr; |
0248680a | 587 | LDREL ldrel; |
4a438fc5 | 588 | ulong t_reloc = (ulong) &_text - f_ohdr.text_start; |
0248680a DL |
589 | #ifndef ALIGN_DATA_RELOC |
590 | ulong d_reloc = (ulong) &_data - f_ohdr.data_start; | |
591 | #else | |
177c0ea7 | 592 | /* This worked (and was needed) before AIX 4.2. |
0248680a | 593 | I have no idea why. -- Mike */ |
4a438fc5 | 594 | ulong d_reloc = (ulong) &_data - ALIGN(f_ohdr.data_start, 2); |
0248680a | 595 | #endif |
4e3a36cd | 596 | int * p; |
4e3a36cd JB |
597 | |
598 | if (load_scnptr == 0) | |
599 | return 0; | |
600 | ||
0248680a | 601 | lseek (a_out, orig_load_scnptr, SEEK_SET); |
4e3a36cd JB |
602 | if (read (a_out, &ldhdr, sizeof (ldhdr)) != sizeof (ldhdr)) |
603 | { | |
604 | PERROR (new_name); | |
605 | } | |
606 | ||
607 | #define SYMNDX_TEXT 0 | |
608 | #define SYMNDX_DATA 1 | |
609 | #define SYMNDX_BSS 2 | |
4e3a36cd | 610 | |
0248680a DL |
611 | for (i = 0; i < ldhdr.l_nreloc; i++) |
612 | { | |
613 | lseek (a_out, | |
614 | orig_load_scnptr + LDHDRSZ + LDSYMSZ*ldhdr.l_nsyms + LDRELSZ*i, | |
615 | SEEK_SET); | |
4e3a36cd | 616 | |
0248680a DL |
617 | if (read (a_out, &ldrel, LDRELSZ) != LDRELSZ) |
618 | { | |
619 | PERROR (a_name); | |
620 | } | |
4e3a36cd JB |
621 | |
622 | /* move the BSS loader symbols to the DATA segment */ | |
0248680a | 623 | if (ldrel.l_symndx == SYMNDX_BSS) |
4e3a36cd | 624 | { |
0248680a | 625 | ldrel.l_symndx = SYMNDX_DATA; |
91b97ddb | 626 | |
4e3a36cd JB |
627 | lseek (new, |
628 | load_scnptr + LDHDRSZ + LDSYMSZ*ldhdr.l_nsyms + LDRELSZ*i, | |
0248680a | 629 | SEEK_SET); |
4e3a36cd | 630 | |
0248680a | 631 | if (write (new, &ldrel, LDRELSZ) != LDRELSZ) |
4e3a36cd JB |
632 | { |
633 | PERROR (new_name); | |
634 | } | |
635 | } | |
636 | ||
0248680a | 637 | if (ldrel.l_rsecnm == f_ohdr.o_sndata) |
4e3a36cd JB |
638 | { |
639 | int orig_int; | |
640 | ||
4a438fc5 | 641 | lseek (a_out, |
0248680a DL |
642 | orig_data_scnptr + (ldrel.l_vaddr - f_ohdr.data_start), |
643 | SEEK_SET); | |
4e3a36cd | 644 | |
0248680a DL |
645 | if (read (a_out, (void *) &orig_int, sizeof (orig_int)) |
646 | != sizeof (orig_int)) | |
4e3a36cd JB |
647 | { |
648 | PERROR (a_name); | |
649 | } | |
650 | ||
0248680a | 651 | p = (int *) (ldrel.l_vaddr + d_reloc); |
4a438fc5 | 652 | |
0248680a | 653 | switch (ldrel.l_symndx) { |
4e3a36cd | 654 | case SYMNDX_TEXT: |
4a438fc5 | 655 | orig_int = * p - t_reloc; |
4e3a36cd JB |
656 | break; |
657 | ||
658 | case SYMNDX_DATA: | |
659 | case SYMNDX_BSS: | |
4a438fc5 | 660 | orig_int = * p - d_reloc; |
4e3a36cd JB |
661 | break; |
662 | } | |
663 | ||
4a438fc5 RS |
664 | if (orig_int != * p) |
665 | { | |
666 | lseek (new, | |
0248680a DL |
667 | data_scnptr + (ldrel.l_vaddr - f_ohdr.data_start), |
668 | SEEK_SET); | |
4a438fc5 RS |
669 | if (write (new, (void *) &orig_int, sizeof (orig_int)) |
670 | != sizeof (orig_int)) | |
671 | { | |
672 | PERROR (new_name); | |
673 | } | |
674 | } | |
4e3a36cd JB |
675 | } |
676 | } | |
0248680a | 677 | return 0; |
76998edb | 678 | } |