Commit | Line | Data |
---|---|---|
0248680a | 1 | /* Dump an executable image. |
429ab54e GM |
2 | Copyright (C) 1985, 1986, 1987, 1988, 1999, 2001, 2002, 2003, 2004, |
3 | 2005, 2006, 2007 Free Software Foundation, Inc. | |
4e3a36cd | 4 | |
3b7ad313 EN |
5 | This file is part of GNU Emacs. |
6 | ||
7 | GNU Emacs is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
684d6f5b | 9 | the Free Software Foundation; either version 3, or (at your option) |
3b7ad313 EN |
10 | any later version. |
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 | |
18 | along with GNU Emacs; see the file COPYING. If not, write to | |
4fc5845f LK |
19 | the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
20 | Boston, MA 02110-1301, USA. | |
4e3a36cd JB |
21 | |
22 | In other words, you are welcome to use, share and improve this program. | |
23 | You are forbidden to forbid anyone else to use, share and improve | |
24 | what you give them. Help stamp out software-hoarding! */ | |
25 | ||
26 | ||
0248680a | 27 | /* Originally based on the COFF unexec.c by Spencer W. Thomas. |
4e3a36cd | 28 | * |
0248680a DL |
29 | * Subsequently hacked on by |
30 | * Bill Mann <Bill_Man@praxisint.com> | |
31 | * Andrew Vignaux <Andrew.Vignaux@comp.vuw.ac.nz> | |
32 | * Mike Sperber <sperber@informatik.uni-tuebingen.de> | |
4a438fc5 | 33 | * |
4e3a36cd JB |
34 | * Synopsis: |
35 | * unexec (new_name, a_name, data_start, bss_start, entry_address) | |
36 | * char *new_name, *a_name; | |
37 | * unsigned data_start, bss_start, entry_address; | |
38 | * | |
39 | * Takes a snapshot of the program and makes an a.out format file in the | |
40 | * file named by the string argument new_name. | |
41 | * If a_name is non-NULL, the symbol table will be taken from the given file. | |
42 | * On some machines, an existing a_name file is required. | |
43 | * | |
0248680a | 44 | * data_start and entry_address are ignored. |
4e3a36cd | 45 | * |
0248680a | 46 | * bss_start indicates how much of the data segment is to be saved in the |
4e3a36cd JB |
47 | * a.out file and restored when the program is executed. It gives the lowest |
48 | * unsaved address, and is rounded up to a page boundary. The default when 0 | |
49 | * is given assumes that the entire data segment is to be stored, including | |
50 | * the previous data and bss as well as any additional storage allocated with | |
0248680a | 51 | * sbrk(2). |
4e3a36cd JB |
52 | * |
53 | */ | |
54 | ||
4e3a36cd JB |
55 | #ifndef emacs |
56 | #define PERROR(arg) perror (arg); return -1 | |
57 | #else | |
18160b98 | 58 | #include <config.h> |
4e3a36cd JB |
59 | #define PERROR(file) report_error (file, new) |
60 | #endif | |
76998edb | 61 | |
4e3a36cd JB |
62 | #include <a.out.h> |
63 | /* Define getpagesize () if the system does not. | |
64 | Note that this may depend on symbols defined in a.out.h | |
65 | */ | |
66 | #include "getpagesize.h" | |
76998edb | 67 | |
4e3a36cd | 68 | #include <sys/types.h> |
4e3a36cd JB |
69 | #include <stdio.h> |
70 | #include <sys/stat.h> | |
71 | #include <errno.h> | |
0248680a DL |
72 | #include <unistd.h> |
73 | #include <fcntl.h> | |
4e3a36cd | 74 | |
0248680a DL |
75 | extern char *start_of_text (void); /* Start of text */ |
76 | extern char *start_of_data (void); /* Start of initialized data */ | |
4e3a36cd JB |
77 | |
78 | extern int _data; | |
4e3a36cd | 79 | extern int _text; |
0248680a | 80 | |
4e3a36cd JB |
81 | #include <filehdr.h> |
82 | #include <aouthdr.h> | |
83 | #include <scnhdr.h> | |
84 | #include <syms.h> | |
0248680a | 85 | |
4e3a36cd JB |
86 | static struct filehdr f_hdr; /* File header */ |
87 | static struct aouthdr f_ohdr; /* Optional file header (a.out) */ | |
0248680a DL |
88 | static long bias; /* Bias to add for growth */ |
89 | static long lnnoptr; /* Pointer to line-number info within file */ | |
4e3a36cd JB |
90 | |
91 | static long text_scnptr; | |
92 | static long data_scnptr; | |
4a438fc5 | 93 | #define ALIGN(val, pwr) (((val) + ((1L<<(pwr))-1)) & ~((1L<<(pwr))-1)) |
4e3a36cd JB |
94 | static long load_scnptr; |
95 | static long orig_load_scnptr; | |
96 | static long orig_data_scnptr; | |
0248680a | 97 | static int unrelocate_symbols (int, int, char *, char *); |
4e3a36cd JB |
98 | |
99 | #ifndef MAX_SECTIONS | |
100 | #define MAX_SECTIONS 10 | |
101 | #endif | |
102 | ||
0248680a | 103 | static int adjust_lnnoptrs (int, int, char *); |
4e3a36cd JB |
104 | |
105 | static int pagemask; | |
106 | ||
107 | /* Correct an int which is the bit pattern of a pointer to a byte | |
108 | into an int which is the number of a byte. | |
109 | This is a no-op on ordinary machines, but not on all. */ | |
110 | ||
111 | #ifndef ADDR_CORRECT /* Let m-*.h files override this definition */ | |
112 | #define ADDR_CORRECT(x) ((char *)(x) - (char*)0) | |
113 | #endif | |
114 | ||
115 | #ifdef emacs | |
8eca17c9 | 116 | #include "lisp.h" |
4e3a36cd | 117 | |
0248680a DL |
118 | static void |
119 | report_error (char *file, int fd) | |
4e3a36cd JB |
120 | { |
121 | if (fd) | |
122 | close (fd); | |
8eca17c9 | 123 | report_file_error ("Cannot unexec", Fcons (build_string (file), Qnil)); |
4e3a36cd JB |
124 | } |
125 | #endif /* emacs */ | |
76998edb | 126 | |
4e3a36cd JB |
127 | #define ERROR0(msg) report_error_1 (new, msg, 0, 0); return -1 |
128 | #define ERROR1(msg,x) report_error_1 (new, msg, x, 0); return -1 | |
129 | #define ERROR2(msg,x,y) report_error_1 (new, msg, x, y); return -1 | |
76998edb | 130 | |
0248680a DL |
131 | static void |
132 | report_error_1 (int fd, char *msg, int a1, int a2) | |
76998edb | 133 | { |
4e3a36cd JB |
134 | close (fd); |
135 | #ifdef emacs | |
136 | error (msg, a1, a2); | |
137 | #else | |
138 | fprintf (stderr, msg, a1, a2); | |
139 | fprintf (stderr, "\n"); | |
140 | #endif | |
141 | } | |
142 | ||
0248680a DL |
143 | static int make_hdr (int, int, unsigned, unsigned, unsigned, char *, char *); |
144 | static void mark_x (char *); | |
145 | static int copy_text_and_data (int); | |
146 | static int copy_sym (int, int, char *, char *); | |
147 | static void write_segment (int, char *, char *); | |
4e3a36cd JB |
148 | \f |
149 | /* **************************************************************** | |
150 | * unexec | |
151 | * | |
152 | * driving logic. | |
153 | */ | |
0248680a | 154 | int unexec (char *new_name, char *a_name, |
c31d7cc9 GM |
155 | unsigned data_start, |
156 | unsigned bss_start, | |
157 | unsigned entry_address) | |
76998edb | 158 | { |
0248680a | 159 | int new = -1, a_out = -1; |
4e3a36cd | 160 | |
0248680a | 161 | if (a_name && (a_out = open (a_name, O_RDONLY)) < 0) |
4e3a36cd JB |
162 | { |
163 | PERROR (a_name); | |
164 | } | |
165 | if ((new = creat (new_name, 0666)) < 0) | |
166 | { | |
167 | PERROR (new_name); | |
168 | } | |
0248680a DL |
169 | if (make_hdr (new, a_out, |
170 | data_start, bss_start, | |
171 | entry_address, | |
172 | a_name, new_name) < 0 | |
4e3a36cd JB |
173 | || copy_text_and_data (new) < 0 |
174 | || copy_sym (new, a_out, a_name, new_name) < 0 | |
4e3a36cd | 175 | || adjust_lnnoptrs (new, a_out, new_name) < 0 |
0248680a | 176 | || unrelocate_symbols (new, a_out, a_name, new_name) < 0) |
76998edb | 177 | { |
4e3a36cd | 178 | close (new); |
177c0ea7 | 179 | return -1; |
76998edb | 180 | } |
76998edb | 181 | |
4e3a36cd JB |
182 | close (new); |
183 | if (a_out >= 0) | |
184 | close (a_out); | |
185 | mark_x (new_name); | |
186 | return 0; | |
187 | } | |
188 | ||
189 | /* **************************************************************** | |
190 | * make_hdr | |
191 | * | |
192 | * Make the header in the new a.out from the header in core. | |
193 | * Modify the text and data sizes. | |
194 | */ | |
195 | static int | |
0248680a DL |
196 | make_hdr (int new, int a_out, |
197 | unsigned data_start, unsigned bss_start, | |
198 | unsigned entry_address, | |
199 | char *a_name, char *new_name) | |
4e3a36cd | 200 | { |
0248680a | 201 | int scns; |
4e3a36cd JB |
202 | unsigned int bss_end; |
203 | ||
204 | struct scnhdr section[MAX_SECTIONS]; | |
205 | struct scnhdr * f_thdr; /* Text section header */ | |
206 | struct scnhdr * f_dhdr; /* Data section header */ | |
207 | struct scnhdr * f_bhdr; /* Bss section header */ | |
208 | struct scnhdr * f_lhdr; /* Loader section header */ | |
209 | struct scnhdr * f_tchdr; /* Typechk section header */ | |
210 | struct scnhdr * f_dbhdr; /* Debug section header */ | |
211 | struct scnhdr * f_xhdr; /* Except section header */ | |
212 | ||
213 | load_scnptr = orig_load_scnptr = lnnoptr = 0; | |
214 | pagemask = getpagesize () - 1; | |
215 | ||
216 | /* Adjust text/data boundary. */ | |
4e3a36cd | 217 | data_start = (long) start_of_data (); |
4e3a36cd JB |
218 | data_start = ADDR_CORRECT (data_start); |
219 | ||
4e3a36cd | 220 | data_start = data_start & ~pagemask; /* (Down) to page boundary. */ |
4e3a36cd JB |
221 | |
222 | bss_end = ADDR_CORRECT (sbrk (0)) + pagemask; | |
223 | bss_end &= ~ pagemask; | |
224 | /* Adjust data/bss boundary. */ | |
225 | if (bss_start != 0) | |
76998edb | 226 | { |
4e3a36cd JB |
227 | bss_start = (ADDR_CORRECT (bss_start) + pagemask); |
228 | /* (Up) to page bdry. */ | |
229 | bss_start &= ~ pagemask; | |
230 | if (bss_start > bss_end) | |
76998edb | 231 | { |
4e3a36cd JB |
232 | ERROR1 ("unexec: Specified bss_start (%u) is past end of program", |
233 | bss_start); | |
76998edb | 234 | } |
76998edb | 235 | } |
4e3a36cd JB |
236 | else |
237 | bss_start = bss_end; | |
76998edb | 238 | |
4e3a36cd JB |
239 | if (data_start > bss_start) /* Can't have negative data size. */ |
240 | { | |
241 | ERROR2 ("unexec: data_start (%u) can't be greater than bss_start (%u)", | |
242 | data_start, bss_start); | |
243 | } | |
76998edb | 244 | |
4e3a36cd | 245 | /* Salvage as much info from the existing file as possible */ |
4e3a36cd JB |
246 | f_thdr = NULL; f_dhdr = NULL; f_bhdr = NULL; |
247 | f_lhdr = NULL; f_tchdr = NULL; f_dbhdr = NULL; f_xhdr = NULL; | |
248 | if (a_out >= 0) | |
76998edb | 249 | { |
4e3a36cd JB |
250 | if (read (a_out, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) |
251 | { | |
252 | PERROR (a_name); | |
253 | } | |
4e3a36cd JB |
254 | if (f_hdr.f_opthdr > 0) |
255 | { | |
256 | if (read (a_out, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) | |
257 | { | |
258 | PERROR (a_name); | |
259 | } | |
4e3a36cd JB |
260 | } |
261 | if (f_hdr.f_nscns > MAX_SECTIONS) | |
262 | { | |
263 | ERROR0 ("unexec: too many section headers -- increase MAX_SECTIONS"); | |
264 | } | |
265 | /* Loop through section headers */ | |
266 | for (scns = 0; scns < f_hdr.f_nscns; scns++) { | |
267 | struct scnhdr *s = §ion[scns]; | |
268 | if (read (a_out, s, sizeof (*s)) != sizeof (*s)) | |
269 | { | |
270 | PERROR (a_name); | |
271 | } | |
4e3a36cd JB |
272 | |
273 | #define CHECK_SCNHDR(ptr, name, flags) \ | |
274 | if (strcmp(s->s_name, name) == 0) { \ | |
275 | if (s->s_flags != flags) { \ | |
d63c1903 KH |
276 | fprintf(stderr, "unexec: %lx flags where %x expected in %s section.\n", \ |
277 | (unsigned long)s->s_flags, flags, name); \ | |
4e3a36cd JB |
278 | } \ |
279 | if (ptr) { \ | |
280 | fprintf(stderr, "unexec: duplicate section header for section %s.\n", \ | |
281 | name); \ | |
282 | } \ | |
283 | ptr = s; \ | |
284 | } | |
285 | CHECK_SCNHDR(f_thdr, _TEXT, STYP_TEXT); | |
286 | CHECK_SCNHDR(f_dhdr, _DATA, STYP_DATA); | |
287 | CHECK_SCNHDR(f_bhdr, _BSS, STYP_BSS); | |
288 | CHECK_SCNHDR(f_lhdr, _LOADER, STYP_LOADER); | |
289 | CHECK_SCNHDR(f_dbhdr, _DEBUG, STYP_DEBUG); | |
290 | CHECK_SCNHDR(f_tchdr, _TYPCHK, STYP_TYPCHK); | |
291 | CHECK_SCNHDR(f_xhdr, _EXCEPT, STYP_EXCEPT); | |
292 | } | |
293 | ||
294 | if (f_thdr == 0) | |
295 | { | |
0248680a | 296 | ERROR1 ("unexec: couldn't find \"%s\" section", (int) _TEXT); |
4e3a36cd JB |
297 | } |
298 | if (f_dhdr == 0) | |
299 | { | |
0248680a | 300 | ERROR1 ("unexec: couldn't find \"%s\" section", (int) _DATA); |
4e3a36cd JB |
301 | } |
302 | if (f_bhdr == 0) | |
303 | { | |
0248680a | 304 | ERROR1 ("unexec: couldn't find \"%s\" section", (int) _BSS); |
4e3a36cd | 305 | } |
76998edb | 306 | } |
4e3a36cd | 307 | else |
76998edb | 308 | { |
4e3a36cd | 309 | ERROR0 ("can't build a COFF file from scratch yet"); |
76998edb | 310 | } |
4e3a36cd JB |
311 | orig_data_scnptr = f_dhdr->s_scnptr; |
312 | orig_load_scnptr = f_lhdr ? f_lhdr->s_scnptr : 0; | |
313 | ||
314 | /* Now we alter the contents of all the f_*hdr variables | |
315 | to correspond to what we want to dump. */ | |
4a438fc5 RS |
316 | |
317 | /* Indicate that the reloc information is no longer valid for ld (bind); | |
318 | we only update it enough to fake out the exec-time loader. */ | |
319 | f_hdr.f_flags |= (F_RELFLG | F_EXEC); | |
320 | ||
0248680a | 321 | f_ohdr.dsize = bss_start - f_ohdr.data_start; |
4e3a36cd JB |
322 | f_ohdr.bsize = bss_end - bss_start; |
323 | ||
324 | f_dhdr->s_size = f_ohdr.dsize; | |
325 | f_bhdr->s_size = f_ohdr.bsize; | |
4a438fc5 RS |
326 | f_bhdr->s_paddr = f_ohdr.data_start + f_ohdr.dsize; |
327 | f_bhdr->s_vaddr = f_ohdr.data_start + f_ohdr.dsize; | |
4e3a36cd JB |
328 | |
329 | /* fix scnptr's */ | |
330 | { | |
4a438fc5 | 331 | ulong ptr = section[0].s_scnptr; |
4e3a36cd | 332 | |
4a438fc5 RS |
333 | bias = -1; |
334 | for (scns = 0; scns < f_hdr.f_nscns; scns++) | |
335 | { | |
336 | struct scnhdr *s = §ion[scns]; | |
4e3a36cd | 337 | |
4a438fc5 RS |
338 | if (s->s_flags & STYP_PAD) /* .pad sections omitted in AIX 4.1 */ |
339 | { | |
340 | /* | |
341 | * the text_start should probably be o_algntext but that doesn't | |
342 | * seem to change | |
343 | */ | |
344 | if (f_ohdr.text_start != 0) /* && scns != 0 */ | |
345 | { | |
346 | s->s_size = 512 - (ptr % 512); | |
347 | if (s->s_size == 512) | |
348 | s->s_size = 0; | |
349 | } | |
350 | s->s_scnptr = ptr; | |
351 | } | |
352 | else if (s->s_flags & STYP_DATA) | |
4e3a36cd | 353 | s->s_scnptr = ptr; |
4a438fc5 RS |
354 | else if (!(s->s_flags & (STYP_TEXT | STYP_BSS))) |
355 | { | |
356 | if (bias == -1) /* if first section after bss */ | |
357 | bias = ptr - s->s_scnptr; | |
4e3a36cd | 358 | |
4a438fc5 RS |
359 | s->s_scnptr += bias; |
360 | ptr = s->s_scnptr; | |
361 | } | |
177c0ea7 | 362 | |
4a438fc5 RS |
363 | ptr = ptr + s->s_size; |
364 | } | |
4e3a36cd JB |
365 | } |
366 | ||
367 | /* fix other pointers */ | |
4a438fc5 RS |
368 | for (scns = 0; scns < f_hdr.f_nscns; scns++) |
369 | { | |
370 | struct scnhdr *s = §ion[scns]; | |
4e3a36cd | 371 | |
4a438fc5 RS |
372 | if (s->s_relptr != 0) |
373 | { | |
374 | s->s_relptr += bias; | |
375 | } | |
376 | if (s->s_lnnoptr != 0) | |
377 | { | |
378 | if (lnnoptr == 0) lnnoptr = s->s_lnnoptr; | |
379 | s->s_lnnoptr += bias; | |
380 | } | |
381 | } | |
4e3a36cd JB |
382 | |
383 | if (f_hdr.f_symptr > 0L) | |
76998edb | 384 | { |
4e3a36cd | 385 | f_hdr.f_symptr += bias; |
76998edb JB |
386 | } |
387 | ||
4e3a36cd JB |
388 | text_scnptr = f_thdr->s_scnptr; |
389 | data_scnptr = f_dhdr->s_scnptr; | |
390 | load_scnptr = f_lhdr ? f_lhdr->s_scnptr : 0; | |
76998edb | 391 | |
4e3a36cd JB |
392 | if (write (new, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) |
393 | { | |
394 | PERROR (new_name); | |
395 | } | |
76998edb | 396 | |
4e3a36cd JB |
397 | if (f_hdr.f_opthdr > 0) |
398 | { | |
399 | if (write (new, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) | |
76998edb | 400 | { |
4e3a36cd JB |
401 | PERROR (new_name); |
402 | } | |
403 | } | |
76998edb | 404 | |
4e3a36cd JB |
405 | for (scns = 0; scns < f_hdr.f_nscns; scns++) { |
406 | struct scnhdr *s = §ion[scns]; | |
407 | if (write (new, s, sizeof (*s)) != sizeof (*s)) | |
408 | { | |
409 | PERROR (new_name); | |
410 | } | |
411 | } | |
76998edb | 412 | |
4e3a36cd | 413 | return (0); |
4e3a36cd JB |
414 | } |
415 | \f | |
416 | /* **************************************************************** | |
177c0ea7 | 417 | |
4e3a36cd JB |
418 | * |
419 | * Copy the text and data segments from memory to the new a.out | |
420 | */ | |
421 | static int | |
0248680a | 422 | copy_text_and_data (int new) |
4e3a36cd | 423 | { |
0248680a DL |
424 | char *end; |
425 | char *ptr; | |
4e3a36cd | 426 | |
0248680a | 427 | lseek (new, (long) text_scnptr, SEEK_SET); |
4e3a36cd JB |
428 | ptr = start_of_text () + text_scnptr; |
429 | end = ptr + f_ohdr.tsize; | |
430 | write_segment (new, ptr, end); | |
431 | ||
0248680a DL |
432 | lseek (new, (long) data_scnptr, SEEK_SET); |
433 | ptr = (char *) f_ohdr.data_start; | |
4e3a36cd JB |
434 | end = ptr + f_ohdr.dsize; |
435 | write_segment (new, ptr, end); | |
436 | ||
437 | return 0; | |
438 | } | |
439 | ||
91b97ddb | 440 | #define UnexBlockSz (1<<12) /* read/write block size */ |
0248680a DL |
441 | static void |
442 | write_segment (int new, char *ptr, char *end) | |
4e3a36cd | 443 | { |
0248680a | 444 | int i, nwrite, ret; |
4e3a36cd JB |
445 | char buf[80]; |
446 | extern int errno; | |
91b97ddb | 447 | char zeros[UnexBlockSz]; |
4e3a36cd JB |
448 | |
449 | for (i = 0; ptr < end;) | |
450 | { | |
91b97ddb RS |
451 | /* distance to next block. */ |
452 | nwrite = (((int) ptr + UnexBlockSz) & -UnexBlockSz) - (int) ptr; | |
4e3a36cd JB |
453 | /* But not beyond specified end. */ |
454 | if (nwrite > end - ptr) nwrite = end - ptr; | |
455 | ret = write (new, ptr, nwrite); | |
456 | /* If write gets a page fault, it means we reached | |
457 | a gap between the old text segment and the old data segment. | |
458 | This gap has probably been remapped into part of the text segment. | |
459 | So write zeros for it. */ | |
460 | if (ret == -1 && errno == EFAULT) | |
76998edb | 461 | { |
0248680a | 462 | memset (zeros, 0, nwrite); |
91b97ddb | 463 | write (new, zeros, nwrite); |
76998edb | 464 | } |
4e3a36cd | 465 | else if (nwrite != ret) |
76998edb | 466 | { |
4e3a36cd | 467 | sprintf (buf, |
d63c1903 KH |
468 | "unexec write failure: addr 0x%lx, fileno %d, size 0x%x, wrote 0x%x, errno %d", |
469 | (unsigned long)ptr, new, nwrite, ret, errno); | |
4e3a36cd | 470 | PERROR (buf); |
76998edb | 471 | } |
4e3a36cd JB |
472 | i += nwrite; |
473 | ptr += nwrite; | |
474 | } | |
475 | } | |
476 | \f | |
477 | /* **************************************************************** | |
478 | * copy_sym | |
479 | * | |
480 | * Copy the relocation information and symbol table from the a.out to the new | |
481 | */ | |
482 | static int | |
0248680a | 483 | copy_sym (int new, int a_out, char *a_name, char *new_name) |
4e3a36cd | 484 | { |
91b97ddb | 485 | char page[UnexBlockSz]; |
4e3a36cd | 486 | int n; |
76998edb | 487 | |
4e3a36cd JB |
488 | if (a_out < 0) |
489 | return 0; | |
76998edb | 490 | |
4a438fc5 | 491 | if (orig_load_scnptr == 0L) |
4e3a36cd | 492 | return 0; |
76998edb | 493 | |
4a438fc5 | 494 | if (lnnoptr && lnnoptr < orig_load_scnptr) /* if there is line number info */ |
0248680a | 495 | lseek (a_out, lnnoptr, SEEK_SET); /* start copying from there */ |
4e3a36cd | 496 | else |
0248680a | 497 | lseek (a_out, orig_load_scnptr, SEEK_SET); /* Position a.out to symtab. */ |
4e3a36cd JB |
498 | |
499 | while ((n = read (a_out, page, sizeof page)) > 0) | |
500 | { | |
501 | if (write (new, page, n) != n) | |
76998edb | 502 | { |
4e3a36cd | 503 | PERROR (new_name); |
76998edb JB |
504 | } |
505 | } | |
4e3a36cd JB |
506 | if (n < 0) |
507 | { | |
508 | PERROR (a_name); | |
509 | } | |
510 | return 0; | |
511 | } | |
512 | \f | |
513 | /* **************************************************************** | |
514 | * mark_x | |
515 | * | |
eb8c3be9 | 516 | * After successfully building the new a.out, mark it executable |
4e3a36cd JB |
517 | */ |
518 | static void | |
0248680a | 519 | mark_x (char *name) |
4e3a36cd JB |
520 | { |
521 | struct stat sbuf; | |
522 | int um; | |
523 | int new = 0; /* for PERROR */ | |
76998edb | 524 | |
4e3a36cd JB |
525 | um = umask (777); |
526 | umask (um); | |
527 | if (stat (name, &sbuf) == -1) | |
528 | { | |
529 | PERROR (name); | |
530 | } | |
531 | sbuf.st_mode |= 0111 & ~um; | |
532 | if (chmod (name, sbuf.st_mode) == -1) | |
533 | PERROR (name); | |
534 | } | |
535 | \f | |
0248680a DL |
536 | static int |
537 | adjust_lnnoptrs (int writedesc, int readdesc, char *new_name) | |
4e3a36cd | 538 | { |
0248680a DL |
539 | int nsyms; |
540 | int naux; | |
541 | int new; | |
4e3a36cd JB |
542 | struct syment symentry; |
543 | union auxent auxentry; | |
4e3a36cd JB |
544 | |
545 | if (!lnnoptr || !f_hdr.f_symptr) | |
546 | return 0; | |
547 | ||
0248680a | 548 | if ((new = open (new_name, O_RDWR)) < 0) |
4e3a36cd JB |
549 | { |
550 | PERROR (new_name); | |
551 | return -1; | |
552 | } | |
553 | ||
0248680a | 554 | lseek (new, f_hdr.f_symptr, SEEK_SET); |
4e3a36cd JB |
555 | for (nsyms = 0; nsyms < f_hdr.f_nsyms; nsyms++) |
556 | { | |
557 | read (new, &symentry, SYMESZ); | |
91b97ddb RS |
558 | if (symentry.n_sclass == C_BINCL || symentry.n_sclass == C_EINCL) |
559 | { | |
560 | symentry.n_value += bias; | |
0248680a | 561 | lseek (new, -SYMESZ, SEEK_CUR); |
91b97ddb RS |
562 | write (new, &symentry, SYMESZ); |
563 | } | |
564 | ||
4a438fc5 | 565 | for (naux = symentry.n_numaux; naux-- != 0; ) |
4e3a36cd JB |
566 | { |
567 | read (new, &auxentry, AUXESZ); | |
568 | nsyms++; | |
4a438fc5 RS |
569 | if (naux != 0 /* skip csect auxentry (last entry) */ |
570 | && (symentry.n_sclass == C_EXT || symentry.n_sclass == C_HIDEXT)) | |
571 | { | |
572 | auxentry.x_sym.x_fcnary.x_fcn.x_lnnoptr += bias; | |
0248680a | 573 | lseek (new, -AUXESZ, SEEK_CUR); |
4a438fc5 RS |
574 | write (new, &auxentry, AUXESZ); |
575 | } | |
4e3a36cd JB |
576 | } |
577 | } | |
578 | close (new); | |
76998edb | 579 | |
0248680a DL |
580 | return 0; |
581 | } | |
4e3a36cd | 582 | |
0248680a DL |
583 | static int |
584 | unrelocate_symbols (int new, int a_out, char *a_name, char *new_name) | |
76998edb | 585 | { |
0248680a | 586 | int i; |
4e3a36cd | 587 | LDHDR ldhdr; |
0248680a | 588 | LDREL ldrel; |
4a438fc5 | 589 | ulong t_reloc = (ulong) &_text - f_ohdr.text_start; |
0248680a DL |
590 | #ifndef ALIGN_DATA_RELOC |
591 | ulong d_reloc = (ulong) &_data - f_ohdr.data_start; | |
592 | #else | |
177c0ea7 | 593 | /* This worked (and was needed) before AIX 4.2. |
0248680a | 594 | I have no idea why. -- Mike */ |
4a438fc5 | 595 | ulong d_reloc = (ulong) &_data - ALIGN(f_ohdr.data_start, 2); |
0248680a | 596 | #endif |
4e3a36cd | 597 | int * p; |
4e3a36cd JB |
598 | |
599 | if (load_scnptr == 0) | |
600 | return 0; | |
601 | ||
0248680a | 602 | lseek (a_out, orig_load_scnptr, SEEK_SET); |
4e3a36cd JB |
603 | if (read (a_out, &ldhdr, sizeof (ldhdr)) != sizeof (ldhdr)) |
604 | { | |
605 | PERROR (new_name); | |
606 | } | |
607 | ||
608 | #define SYMNDX_TEXT 0 | |
609 | #define SYMNDX_DATA 1 | |
610 | #define SYMNDX_BSS 2 | |
4e3a36cd | 611 | |
0248680a DL |
612 | for (i = 0; i < ldhdr.l_nreloc; i++) |
613 | { | |
614 | lseek (a_out, | |
615 | orig_load_scnptr + LDHDRSZ + LDSYMSZ*ldhdr.l_nsyms + LDRELSZ*i, | |
616 | SEEK_SET); | |
4e3a36cd | 617 | |
0248680a DL |
618 | if (read (a_out, &ldrel, LDRELSZ) != LDRELSZ) |
619 | { | |
620 | PERROR (a_name); | |
621 | } | |
4e3a36cd JB |
622 | |
623 | /* move the BSS loader symbols to the DATA segment */ | |
0248680a | 624 | if (ldrel.l_symndx == SYMNDX_BSS) |
4e3a36cd | 625 | { |
0248680a | 626 | ldrel.l_symndx = SYMNDX_DATA; |
91b97ddb | 627 | |
4e3a36cd JB |
628 | lseek (new, |
629 | load_scnptr + LDHDRSZ + LDSYMSZ*ldhdr.l_nsyms + LDRELSZ*i, | |
0248680a | 630 | SEEK_SET); |
4e3a36cd | 631 | |
0248680a | 632 | if (write (new, &ldrel, LDRELSZ) != LDRELSZ) |
4e3a36cd JB |
633 | { |
634 | PERROR (new_name); | |
635 | } | |
636 | } | |
637 | ||
0248680a | 638 | if (ldrel.l_rsecnm == f_ohdr.o_sndata) |
4e3a36cd JB |
639 | { |
640 | int orig_int; | |
641 | ||
4a438fc5 | 642 | lseek (a_out, |
0248680a DL |
643 | orig_data_scnptr + (ldrel.l_vaddr - f_ohdr.data_start), |
644 | SEEK_SET); | |
4e3a36cd | 645 | |
0248680a DL |
646 | if (read (a_out, (void *) &orig_int, sizeof (orig_int)) |
647 | != sizeof (orig_int)) | |
4e3a36cd JB |
648 | { |
649 | PERROR (a_name); | |
650 | } | |
651 | ||
0248680a | 652 | p = (int *) (ldrel.l_vaddr + d_reloc); |
4a438fc5 | 653 | |
0248680a | 654 | switch (ldrel.l_symndx) { |
4e3a36cd | 655 | case SYMNDX_TEXT: |
4a438fc5 | 656 | orig_int = * p - t_reloc; |
4e3a36cd JB |
657 | break; |
658 | ||
659 | case SYMNDX_DATA: | |
660 | case SYMNDX_BSS: | |
4a438fc5 | 661 | orig_int = * p - d_reloc; |
4e3a36cd JB |
662 | break; |
663 | } | |
664 | ||
4a438fc5 RS |
665 | if (orig_int != * p) |
666 | { | |
667 | lseek (new, | |
0248680a DL |
668 | data_scnptr + (ldrel.l_vaddr - f_ohdr.data_start), |
669 | SEEK_SET); | |
4a438fc5 RS |
670 | if (write (new, (void *) &orig_int, sizeof (orig_int)) |
671 | != sizeof (orig_int)) | |
672 | { | |
673 | PERROR (new_name); | |
674 | } | |
675 | } | |
4e3a36cd JB |
676 | } |
677 | } | |
0248680a | 678 | return 0; |
76998edb | 679 | } |
ab5796a9 MB |
680 | |
681 | /* arch-tag: 0783857a-7c2d-456f-a426-58b722d69fd0 | |
682 | (do not change this comment) */ |