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4e3a36cd JB |
1 | /* Modified by Andrew.Vignaux@comp.vuw.ac.nz to get it to work :-) */ |
2 | ||
3 | /* Copyright (C) 1985, 1986, 1987, 1988 Free Software Foundation, Inc. | |
4 | ||
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 1, or (at your option) | |
8 | any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program; if not, write to the Free Software | |
17 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
18 | ||
19 | In other words, you are welcome to use, share and improve this program. | |
20 | You are forbidden to forbid anyone else to use, share and improve | |
21 | what you give them. Help stamp out software-hoarding! */ | |
22 | ||
23 | ||
24 | /* | |
25 | * unexec.c - Convert a running program into an a.out file. | |
26 | * | |
27 | * Author: Spencer W. Thomas | |
28 | * Computer Science Dept. | |
29 | * University of Utah | |
30 | * Date: Tue Mar 2 1982 | |
31 | * Modified heavily since then. | |
32 | * | |
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 | * | |
43 | * The boundaries within the a.out file may be adjusted with the data_start | |
44 | * and bss_start arguments. Either or both may be given as 0 for defaults. | |
45 | * | |
46 | * Data_start gives the boundary between the text segment and the data | |
47 | * segment of the program. The text segment can contain shared, read-only | |
48 | * program code and literal data, while the data segment is always unshared | |
49 | * and unprotected. Data_start gives the lowest unprotected address. | |
50 | * The value you specify may be rounded down to a suitable boundary | |
51 | * as required by the machine you are using. | |
52 | * | |
53 | * Specifying zero for data_start means the boundary between text and data | |
54 | * should not be the same as when the program was loaded. | |
55 | * If NO_REMAP is defined, the argument data_start is ignored and the | |
56 | * segment boundaries are never changed. | |
57 | * | |
58 | * Bss_start indicates how much of the data segment is to be saved in the | |
59 | * a.out file and restored when the program is executed. It gives the lowest | |
60 | * unsaved address, and is rounded up to a page boundary. The default when 0 | |
61 | * is given assumes that the entire data segment is to be stored, including | |
62 | * the previous data and bss as well as any additional storage allocated with | |
63 | * break (2). | |
64 | * | |
65 | * The new file is set up to start at entry_address. | |
66 | * | |
67 | * If you make improvements I'd like to get them too. | |
68 | * harpo!utah-cs!thomas, thomas@Utah-20 | |
69 | * | |
70 | */ | |
71 | ||
72 | /* There are several compilation parameters affecting unexec: | |
73 | ||
74 | * COFF | |
75 | ||
76 | Define this if your system uses COFF for executables. | |
77 | Otherwise we assume you use Berkeley format. | |
78 | ||
79 | * NO_REMAP | |
80 | ||
81 | Define this if you do not want to try to save Emacs's pure data areas | |
82 | as part of the text segment. | |
83 | ||
84 | Saving them as text is good because it allows users to share more. | |
85 | ||
86 | However, on machines that locate the text area far from the data area, | |
87 | the boundary cannot feasibly be moved. Such machines require | |
88 | NO_REMAP. | |
89 | ||
90 | Also, remapping can cause trouble with the built-in startup routine | |
91 | /lib/crt0.o, which defines `environ' as an initialized variable. | |
92 | Dumping `environ' as pure does not work! So, to use remapping, | |
93 | you must write a startup routine for your machine in Emacs's crt0.c. | |
94 | If NO_REMAP is defined, Emacs uses the system's crt0.o. | |
95 | ||
96 | * SECTION_ALIGNMENT | |
97 | ||
98 | Some machines that use COFF executables require that each section | |
99 | start on a certain boundary *in the COFF file*. Such machines should | |
100 | define SECTION_ALIGNMENT to a mask of the low-order bits that must be | |
101 | zero on such a boundary. This mask is used to control padding between | |
102 | segments in the COFF file. | |
103 | ||
104 | If SECTION_ALIGNMENT is not defined, the segments are written | |
105 | consecutively with no attempt at alignment. This is right for | |
106 | unmodified system V. | |
107 | ||
108 | * SEGMENT_MASK | |
109 | ||
110 | Some machines require that the beginnings and ends of segments | |
111 | *in core* be on certain boundaries. For most machines, a page | |
112 | boundary is sufficient. That is the default. When a larger | |
113 | boundary is needed, define SEGMENT_MASK to a mask of | |
114 | the bits that must be zero on such a boundary. | |
115 | ||
116 | * A_TEXT_OFFSET(HDR) | |
117 | ||
118 | Some machines count the a.out header as part of the size of the text | |
119 | segment (a_text); they may actually load the header into core as the | |
120 | first data in the text segment. Some have additional padding between | |
121 | the header and the real text of the program that is counted in a_text. | |
122 | ||
123 | For these machines, define A_TEXT_OFFSET(HDR) to examine the header | |
124 | structure HDR and return the number of bytes to add to `a_text' | |
125 | before writing it (above and beyond the number of bytes of actual | |
126 | program text). HDR's standard fields are already correct, except that | |
127 | this adjustment to the `a_text' field has not yet been made; | |
128 | thus, the amount of offset can depend on the data in the file. | |
129 | ||
130 | * A_TEXT_SEEK(HDR) | |
131 | ||
132 | If defined, this macro specifies the number of bytes to seek into the | |
133 | a.out file before starting to write the text segment.a | |
134 | ||
135 | * EXEC_MAGIC | |
136 | ||
137 | For machines using COFF, this macro, if defined, is a value stored | |
138 | into the magic number field of the output file. | |
139 | ||
140 | * ADJUST_EXEC_HEADER | |
141 | ||
142 | This macro can be used to generate statements to adjust or | |
143 | initialize nonstandard fields in the file header | |
144 | ||
145 | * ADDR_CORRECT(ADDR) | |
146 | ||
147 | Macro to correct an int which is the bit pattern of a pointer to a byte | |
148 | into an int which is the number of a byte. | |
149 | ||
150 | This macro has a default definition which is usually right. | |
151 | This default definition is a no-op on most machines (where a | |
152 | pointer looks like an int) but not on all machines. | |
153 | ||
8a281f86 RS |
154 | */ |
155 | ||
4e3a36cd JB |
156 | #define XCOFF |
157 | #define COFF | |
158 | #define NO_REMAP | |
76998edb | 159 | |
4e3a36cd JB |
160 | #ifndef emacs |
161 | #define PERROR(arg) perror (arg); return -1 | |
162 | #else | |
18160b98 | 163 | #include <config.h> |
4e3a36cd JB |
164 | #define PERROR(file) report_error (file, new) |
165 | #endif | |
76998edb | 166 | |
4e3a36cd | 167 | #ifndef CANNOT_DUMP /* all rest of file! */ |
76998edb | 168 | |
4e3a36cd | 169 | #ifndef CANNOT_UNEXEC /* most of rest of file */ |
76998edb | 170 | |
4e3a36cd JB |
171 | #include <a.out.h> |
172 | /* Define getpagesize () if the system does not. | |
173 | Note that this may depend on symbols defined in a.out.h | |
174 | */ | |
175 | #include "getpagesize.h" | |
76998edb | 176 | |
4e3a36cd JB |
177 | #ifndef makedev /* Try to detect types.h already loaded */ |
178 | #include <sys/types.h> | |
179 | #endif | |
180 | #include <stdio.h> | |
181 | #include <sys/stat.h> | |
182 | #include <errno.h> | |
183 | ||
184 | extern char *start_of_text (); /* Start of text */ | |
185 | extern char *start_of_data (); /* Start of initialized data */ | |
186 | ||
187 | extern int _data; | |
188 | extern int _edata; | |
189 | extern int _text; | |
190 | extern int _etext; | |
191 | extern int _end; | |
192 | #ifdef COFF | |
193 | #ifndef USG | |
194 | #ifndef STRIDE | |
195 | #ifndef UMAX | |
196 | #ifndef sun386 | |
197 | /* I have a suspicion that these are turned off on all systems | |
198 | and can be deleted. Try it in version 19. */ | |
199 | #include <filehdr.h> | |
200 | #include <aouthdr.h> | |
201 | #include <scnhdr.h> | |
202 | #include <syms.h> | |
203 | #endif /* not sun386 */ | |
204 | #endif /* not UMAX */ | |
205 | #endif /* Not STRIDE */ | |
206 | #endif /* not USG */ | |
207 | static long block_copy_start; /* Old executable start point */ | |
208 | static struct filehdr f_hdr; /* File header */ | |
209 | static struct aouthdr f_ohdr; /* Optional file header (a.out) */ | |
210 | long bias; /* Bias to add for growth */ | |
211 | long lnnoptr; /* Pointer to line-number info within file */ | |
212 | #define SYMS_START block_copy_start | |
213 | ||
214 | static long text_scnptr; | |
215 | static long data_scnptr; | |
216 | #ifdef XCOFF | |
217 | static long load_scnptr; | |
218 | static long orig_load_scnptr; | |
219 | static long orig_data_scnptr; | |
220 | #endif | |
221 | static long data_st; | |
222 | ||
223 | #ifndef MAX_SECTIONS | |
224 | #define MAX_SECTIONS 10 | |
225 | #endif | |
226 | ||
227 | #endif /* COFF */ | |
228 | ||
229 | static int pagemask; | |
230 | ||
231 | /* Correct an int which is the bit pattern of a pointer to a byte | |
232 | into an int which is the number of a byte. | |
233 | This is a no-op on ordinary machines, but not on all. */ | |
234 | ||
235 | #ifndef ADDR_CORRECT /* Let m-*.h files override this definition */ | |
236 | #define ADDR_CORRECT(x) ((char *)(x) - (char*)0) | |
237 | #endif | |
238 | ||
239 | #ifdef emacs | |
240 | ||
241 | static | |
242 | report_error (file, fd) | |
243 | char *file; | |
244 | int fd; | |
245 | { | |
246 | if (fd) | |
247 | close (fd); | |
248 | error ("Failure operating on %s", file); | |
249 | } | |
250 | #endif /* emacs */ | |
76998edb | 251 | |
4e3a36cd JB |
252 | #define ERROR0(msg) report_error_1 (new, msg, 0, 0); return -1 |
253 | #define ERROR1(msg,x) report_error_1 (new, msg, x, 0); return -1 | |
254 | #define ERROR2(msg,x,y) report_error_1 (new, msg, x, y); return -1 | |
76998edb | 255 | |
4e3a36cd JB |
256 | static |
257 | report_error_1 (fd, msg, a1, a2) | |
258 | int fd; | |
259 | char *msg; | |
260 | int a1, a2; | |
76998edb | 261 | { |
4e3a36cd JB |
262 | close (fd); |
263 | #ifdef emacs | |
264 | error (msg, a1, a2); | |
265 | #else | |
266 | fprintf (stderr, msg, a1, a2); | |
267 | fprintf (stderr, "\n"); | |
268 | #endif | |
269 | } | |
270 | ||
271 | static int make_hdr (); | |
272 | static void mark_x (); | |
273 | static int copy_text_and_data (); | |
274 | static int copy_sym (); | |
275 | \f | |
276 | /* **************************************************************** | |
277 | * unexec | |
278 | * | |
279 | * driving logic. | |
280 | */ | |
281 | unexec (new_name, a_name, data_start, bss_start, entry_address) | |
282 | char *new_name, *a_name; | |
283 | unsigned data_start, bss_start, entry_address; | |
76998edb | 284 | { |
4e3a36cd JB |
285 | int new, a_out = -1; |
286 | ||
287 | if (a_name && (a_out = open (a_name, 0)) < 0) | |
288 | { | |
289 | PERROR (a_name); | |
290 | } | |
291 | if ((new = creat (new_name, 0666)) < 0) | |
292 | { | |
293 | PERROR (new_name); | |
294 | } | |
295 | if (make_hdr (new,a_out,data_start,bss_start,entry_address,a_name,new_name) < 0 | |
296 | || copy_text_and_data (new) < 0 | |
297 | || copy_sym (new, a_out, a_name, new_name) < 0 | |
298 | #ifdef COFF | |
299 | || adjust_lnnoptrs (new, a_out, new_name) < 0 | |
300 | #endif | |
301 | #ifdef XCOFF | |
302 | || unrelocate_symbols (new, a_out, a_name, new_name) < 0 | |
303 | #endif | |
304 | ) | |
76998edb | 305 | { |
4e3a36cd JB |
306 | close (new); |
307 | /* unlink (new_name); /* Failed, unlink new a.out */ | |
308 | return -1; | |
76998edb | 309 | } |
76998edb | 310 | |
4e3a36cd JB |
311 | close (new); |
312 | if (a_out >= 0) | |
313 | close (a_out); | |
314 | mark_x (new_name); | |
315 | return 0; | |
316 | } | |
317 | ||
318 | /* **************************************************************** | |
319 | * make_hdr | |
320 | * | |
321 | * Make the header in the new a.out from the header in core. | |
322 | * Modify the text and data sizes. | |
323 | */ | |
324 | static int | |
325 | make_hdr (new, a_out, data_start, bss_start, entry_address, a_name, new_name) | |
326 | int new, a_out; | |
327 | unsigned data_start, bss_start, entry_address; | |
328 | char *a_name; | |
329 | char *new_name; | |
330 | { | |
331 | register int scns; | |
332 | unsigned int bss_end; | |
333 | ||
334 | struct scnhdr section[MAX_SECTIONS]; | |
335 | struct scnhdr * f_thdr; /* Text section header */ | |
336 | struct scnhdr * f_dhdr; /* Data section header */ | |
337 | struct scnhdr * f_bhdr; /* Bss section header */ | |
338 | struct scnhdr * f_lhdr; /* Loader section header */ | |
339 | struct scnhdr * f_tchdr; /* Typechk section header */ | |
340 | struct scnhdr * f_dbhdr; /* Debug section header */ | |
341 | struct scnhdr * f_xhdr; /* Except section header */ | |
342 | ||
343 | load_scnptr = orig_load_scnptr = lnnoptr = 0; | |
344 | pagemask = getpagesize () - 1; | |
345 | ||
346 | /* Adjust text/data boundary. */ | |
347 | #ifdef NO_REMAP | |
348 | data_start = (long) start_of_data (); | |
349 | #endif /* NO_REMAP */ | |
350 | data_start = ADDR_CORRECT (data_start); | |
351 | ||
352 | #ifdef SEGMENT_MASK | |
353 | data_start = data_start & ~SEGMENT_MASK; /* (Down) to segment boundary. */ | |
354 | #else | |
355 | data_start = data_start & ~pagemask; /* (Down) to page boundary. */ | |
356 | #endif | |
357 | ||
358 | ||
359 | bss_end = ADDR_CORRECT (sbrk (0)) + pagemask; | |
360 | bss_end &= ~ pagemask; | |
361 | /* Adjust data/bss boundary. */ | |
362 | if (bss_start != 0) | |
76998edb | 363 | { |
4e3a36cd JB |
364 | bss_start = (ADDR_CORRECT (bss_start) + pagemask); |
365 | /* (Up) to page bdry. */ | |
366 | bss_start &= ~ pagemask; | |
367 | if (bss_start > bss_end) | |
76998edb | 368 | { |
4e3a36cd JB |
369 | ERROR1 ("unexec: Specified bss_start (%u) is past end of program", |
370 | bss_start); | |
76998edb | 371 | } |
76998edb | 372 | } |
4e3a36cd JB |
373 | else |
374 | bss_start = bss_end; | |
76998edb | 375 | |
4e3a36cd JB |
376 | if (data_start > bss_start) /* Can't have negative data size. */ |
377 | { | |
378 | ERROR2 ("unexec: data_start (%u) can't be greater than bss_start (%u)", | |
379 | data_start, bss_start); | |
380 | } | |
76998edb | 381 | |
4e3a36cd JB |
382 | #ifdef COFF |
383 | /* Salvage as much info from the existing file as possible */ | |
384 | block_copy_start = 0; | |
385 | f_thdr = NULL; f_dhdr = NULL; f_bhdr = NULL; | |
386 | f_lhdr = NULL; f_tchdr = NULL; f_dbhdr = NULL; f_xhdr = NULL; | |
387 | if (a_out >= 0) | |
76998edb | 388 | { |
4e3a36cd JB |
389 | if (read (a_out, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) |
390 | { | |
391 | PERROR (a_name); | |
392 | } | |
393 | block_copy_start += sizeof (f_hdr); | |
394 | if (f_hdr.f_opthdr > 0) | |
395 | { | |
396 | if (read (a_out, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) | |
397 | { | |
398 | PERROR (a_name); | |
399 | } | |
400 | block_copy_start += sizeof (f_ohdr); | |
401 | } | |
402 | if (f_hdr.f_nscns > MAX_SECTIONS) | |
403 | { | |
404 | ERROR0 ("unexec: too many section headers -- increase MAX_SECTIONS"); | |
405 | } | |
406 | /* Loop through section headers */ | |
407 | for (scns = 0; scns < f_hdr.f_nscns; scns++) { | |
408 | struct scnhdr *s = §ion[scns]; | |
409 | if (read (a_out, s, sizeof (*s)) != sizeof (*s)) | |
410 | { | |
411 | PERROR (a_name); | |
412 | } | |
413 | if (s->s_scnptr > 0L) | |
414 | { | |
415 | if (block_copy_start < s->s_scnptr + s->s_size) | |
416 | block_copy_start = s->s_scnptr + s->s_size; | |
417 | } | |
418 | ||
419 | #define CHECK_SCNHDR(ptr, name, flags) \ | |
420 | if (strcmp(s->s_name, name) == 0) { \ | |
421 | if (s->s_flags != flags) { \ | |
422 | fprintf(stderr, "unexec: %x flags where %x expected in %s section.\n", \ | |
423 | s->s_flags, flags, name); \ | |
424 | } \ | |
425 | if (ptr) { \ | |
426 | fprintf(stderr, "unexec: duplicate section header for section %s.\n", \ | |
427 | name); \ | |
428 | } \ | |
429 | ptr = s; \ | |
430 | } | |
431 | CHECK_SCNHDR(f_thdr, _TEXT, STYP_TEXT); | |
432 | CHECK_SCNHDR(f_dhdr, _DATA, STYP_DATA); | |
433 | CHECK_SCNHDR(f_bhdr, _BSS, STYP_BSS); | |
434 | CHECK_SCNHDR(f_lhdr, _LOADER, STYP_LOADER); | |
435 | CHECK_SCNHDR(f_dbhdr, _DEBUG, STYP_DEBUG); | |
436 | CHECK_SCNHDR(f_tchdr, _TYPCHK, STYP_TYPCHK); | |
437 | CHECK_SCNHDR(f_xhdr, _EXCEPT, STYP_EXCEPT); | |
438 | } | |
439 | ||
440 | if (f_thdr == 0) | |
441 | { | |
442 | ERROR1 ("unexec: couldn't find \"%s\" section", _TEXT); | |
443 | } | |
444 | if (f_dhdr == 0) | |
445 | { | |
446 | ERROR1 ("unexec: couldn't find \"%s\" section", _DATA); | |
447 | } | |
448 | if (f_bhdr == 0) | |
449 | { | |
450 | ERROR1 ("unexec: couldn't find \"%s\" section", _BSS); | |
451 | } | |
76998edb | 452 | } |
4e3a36cd | 453 | else |
76998edb | 454 | { |
4e3a36cd | 455 | ERROR0 ("can't build a COFF file from scratch yet"); |
76998edb | 456 | } |
4e3a36cd JB |
457 | orig_data_scnptr = f_dhdr->s_scnptr; |
458 | orig_load_scnptr = f_lhdr ? f_lhdr->s_scnptr : 0; | |
459 | ||
460 | /* Now we alter the contents of all the f_*hdr variables | |
461 | to correspond to what we want to dump. */ | |
462 | f_hdr.f_flags |= (F_RELFLG | F_EXEC); /* Why? */ | |
463 | #ifdef EXEC_MAGIC | |
464 | f_ohdr.magic = EXEC_MAGIC; | |
465 | #endif | |
466 | #ifndef NO_REMAP | |
467 | f_ohdr.tsize = data_start - f_ohdr.text_start; | |
468 | f_ohdr.text_start = (long) start_of_text (); | |
469 | #endif | |
470 | f_ohdr.dsize = bss_start - ((unsigned) &_data); | |
471 | f_ohdr.bsize = bss_end - bss_start; | |
472 | ||
473 | f_dhdr->s_size = f_ohdr.dsize; | |
474 | f_bhdr->s_size = f_ohdr.bsize; | |
475 | f_bhdr->s_paddr = f_ohdr.dsize; | |
476 | f_bhdr->s_vaddr = f_ohdr.dsize; | |
477 | ||
478 | /* fix scnptr's */ | |
479 | { | |
480 | long ptr; | |
481 | ||
482 | for (scns = 0; scns < f_hdr.f_nscns; scns++) { | |
483 | struct scnhdr *s = §ion[scns]; | |
484 | if (scns == 0) | |
485 | ptr = s->s_scnptr; | |
486 | ||
487 | if (s->s_scnptr != 0) | |
488 | { | |
489 | s->s_scnptr = ptr; | |
490 | } | |
76998edb | 491 | |
4e3a36cd JB |
492 | if ((s->s_flags & 0xffff) == STYP_PAD) |
493 | { | |
494 | /* | |
495 | * the text_start should probably be o_algntext but that doesn't | |
496 | * seem to change | |
497 | */ | |
498 | if (f_ohdr.text_start != 0) /* && scns != 0 */ | |
499 | { | |
500 | s->s_size = 512 - (s->s_scnptr % 512); | |
501 | if (s->s_size == 512) | |
502 | s->s_size = 0; | |
503 | } | |
504 | } | |
505 | ||
506 | ptr = ptr + s->s_size; | |
507 | } | |
508 | ||
509 | bias = ptr - block_copy_start; | |
510 | } | |
511 | ||
512 | /* fix other pointers */ | |
513 | for (scns = 0; scns < f_hdr.f_nscns; scns++) { | |
514 | struct scnhdr *s = §ion[scns]; | |
515 | ||
516 | if (s->s_relptr != 0) | |
517 | { | |
518 | s->s_relptr += bias; | |
519 | } | |
520 | if (s->s_lnnoptr != 0) | |
521 | { | |
522 | if (lnnoptr == 0) lnnoptr = s->s_lnnoptr; | |
523 | s->s_lnnoptr += bias; | |
524 | } | |
525 | } | |
526 | ||
527 | if (f_hdr.f_symptr > 0L) | |
76998edb | 528 | { |
4e3a36cd | 529 | f_hdr.f_symptr += bias; |
76998edb JB |
530 | } |
531 | ||
4e3a36cd JB |
532 | data_st = data_start; |
533 | text_scnptr = f_thdr->s_scnptr; | |
534 | data_scnptr = f_dhdr->s_scnptr; | |
535 | load_scnptr = f_lhdr ? f_lhdr->s_scnptr : 0; | |
536 | block_copy_start = orig_load_scnptr; | |
76998edb | 537 | |
4e3a36cd JB |
538 | #ifdef ADJUST_EXEC_HEADER |
539 | ADJUST_EXEC_HEADER | |
540 | #endif /* ADJUST_EXEC_HEADER */ | |
76998edb | 541 | |
4e3a36cd JB |
542 | if (write (new, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) |
543 | { | |
544 | PERROR (new_name); | |
545 | } | |
76998edb | 546 | |
4e3a36cd JB |
547 | if (f_hdr.f_opthdr > 0) |
548 | { | |
549 | if (write (new, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) | |
76998edb | 550 | { |
4e3a36cd JB |
551 | PERROR (new_name); |
552 | } | |
553 | } | |
76998edb | 554 | |
4e3a36cd JB |
555 | for (scns = 0; scns < f_hdr.f_nscns; scns++) { |
556 | struct scnhdr *s = §ion[scns]; | |
557 | if (write (new, s, sizeof (*s)) != sizeof (*s)) | |
558 | { | |
559 | PERROR (new_name); | |
560 | } | |
561 | } | |
76998edb | 562 | |
4e3a36cd JB |
563 | return (0); |
564 | ||
565 | #endif /* COFF */ | |
566 | } | |
567 | \f | |
568 | /* **************************************************************** | |
569 | ||
570 | * | |
571 | * Copy the text and data segments from memory to the new a.out | |
572 | */ | |
573 | static int | |
574 | copy_text_and_data (new) | |
575 | int new; | |
576 | { | |
577 | register char *end; | |
578 | register char *ptr; | |
579 | ||
580 | lseek (new, (long) text_scnptr, 0); | |
581 | ptr = start_of_text () + text_scnptr; | |
582 | end = ptr + f_ohdr.tsize; | |
583 | write_segment (new, ptr, end); | |
584 | ||
585 | lseek (new, (long) data_scnptr, 0); | |
586 | ptr = (char *) &_data; | |
587 | end = ptr + f_ohdr.dsize; | |
588 | write_segment (new, ptr, end); | |
589 | ||
590 | return 0; | |
591 | } | |
592 | ||
593 | write_segment (new, ptr, end) | |
594 | int new; | |
595 | register char *ptr, *end; | |
596 | { | |
597 | register int i, nwrite, ret; | |
598 | char buf[80]; | |
599 | extern int errno; | |
600 | char zeros[128]; | |
76998edb | 601 | |
4e3a36cd JB |
602 | bzero (zeros, sizeof zeros); |
603 | ||
604 | for (i = 0; ptr < end;) | |
605 | { | |
606 | /* distance to next multiple of 128. */ | |
607 | nwrite = (((int) ptr + 128) & -128) - (int) ptr; | |
608 | /* But not beyond specified end. */ | |
609 | if (nwrite > end - ptr) nwrite = end - ptr; | |
610 | ret = write (new, ptr, nwrite); | |
611 | /* If write gets a page fault, it means we reached | |
612 | a gap between the old text segment and the old data segment. | |
613 | This gap has probably been remapped into part of the text segment. | |
614 | So write zeros for it. */ | |
615 | if (ret == -1 && errno == EFAULT) | |
76998edb | 616 | { |
4e3a36cd | 617 | write (new, zeros, nwrite); |
76998edb | 618 | } |
4e3a36cd | 619 | else if (nwrite != ret) |
76998edb | 620 | { |
4e3a36cd JB |
621 | sprintf (buf, |
622 | "unexec write failure: addr 0x%x, fileno %d, size 0x%x, wrote 0x%x, errno %d", | |
623 | ptr, new, nwrite, ret, errno); | |
624 | PERROR (buf); | |
76998edb | 625 | } |
4e3a36cd JB |
626 | i += nwrite; |
627 | ptr += nwrite; | |
628 | } | |
629 | } | |
630 | \f | |
631 | /* **************************************************************** | |
632 | * copy_sym | |
633 | * | |
634 | * Copy the relocation information and symbol table from the a.out to the new | |
635 | */ | |
636 | static int | |
637 | copy_sym (new, a_out, a_name, new_name) | |
638 | int new, a_out; | |
639 | char *a_name, *new_name; | |
640 | { | |
641 | char page[1024]; | |
642 | int n; | |
76998edb | 643 | |
4e3a36cd JB |
644 | if (a_out < 0) |
645 | return 0; | |
76998edb | 646 | |
4e3a36cd JB |
647 | if (SYMS_START == 0L) |
648 | return 0; | |
76998edb | 649 | |
4e3a36cd JB |
650 | if (lnnoptr && lnnoptr < SYMS_START) /* if there is line number info */ |
651 | lseek (a_out, lnnoptr, 0); /* start copying from there */ | |
652 | else | |
653 | lseek (a_out, SYMS_START, 0); /* Position a.out to symtab. */ | |
654 | ||
655 | while ((n = read (a_out, page, sizeof page)) > 0) | |
656 | { | |
657 | if (write (new, page, n) != n) | |
76998edb | 658 | { |
4e3a36cd | 659 | PERROR (new_name); |
76998edb JB |
660 | } |
661 | } | |
4e3a36cd JB |
662 | if (n < 0) |
663 | { | |
664 | PERROR (a_name); | |
665 | } | |
666 | return 0; | |
667 | } | |
668 | \f | |
669 | /* **************************************************************** | |
670 | * mark_x | |
671 | * | |
eb8c3be9 | 672 | * After successfully building the new a.out, mark it executable |
4e3a36cd JB |
673 | */ |
674 | static void | |
675 | mark_x (name) | |
676 | char *name; | |
677 | { | |
678 | struct stat sbuf; | |
679 | int um; | |
680 | int new = 0; /* for PERROR */ | |
76998edb | 681 | |
4e3a36cd JB |
682 | um = umask (777); |
683 | umask (um); | |
684 | if (stat (name, &sbuf) == -1) | |
685 | { | |
686 | PERROR (name); | |
687 | } | |
688 | sbuf.st_mode |= 0111 & ~um; | |
689 | if (chmod (name, sbuf.st_mode) == -1) | |
690 | PERROR (name); | |
691 | } | |
692 | \f | |
693 | /* | |
694 | * If the COFF file contains a symbol table and a line number section, | |
695 | * then any auxiliary entries that have values for x_lnnoptr must | |
696 | * be adjusted by the amount that the line number section has moved | |
697 | * in the file (bias computed in make_hdr). The #@$%&* designers of | |
698 | * the auxiliary entry structures used the absolute file offsets for | |
699 | * the line number entry rather than an offset from the start of the | |
700 | * line number section! | |
701 | * | |
702 | * When I figure out how to scan through the symbol table and pick out | |
703 | * the auxiliary entries that need adjustment, this routine will | |
704 | * be fixed. As it is now, all such entries are wrong and sdb | |
705 | * will complain. Fred Fish, UniSoft Systems Inc. | |
706 | */ | |
707 | ||
708 | #ifdef COFF | |
709 | ||
710 | /* This function is probably very slow. Instead of reopening the new | |
711 | file for input and output it should copy from the old to the new | |
712 | using the two descriptors already open (WRITEDESC and READDESC). | |
713 | Instead of reading one small structure at a time it should use | |
714 | a reasonable size buffer. But I don't have time to work on such | |
715 | things, so I am installing it as submitted to me. -- RMS. */ | |
716 | ||
717 | adjust_lnnoptrs (writedesc, readdesc, new_name) | |
718 | int writedesc; | |
719 | int readdesc; | |
720 | char *new_name; | |
721 | { | |
722 | register int nsyms; | |
723 | register int new; | |
724 | #ifdef amdahl_uts | |
725 | SYMENT symentry; | |
726 | AUXENT auxentry; | |
727 | #else | |
728 | struct syment symentry; | |
729 | union auxent auxentry; | |
730 | #endif | |
731 | ||
732 | if (!lnnoptr || !f_hdr.f_symptr) | |
733 | return 0; | |
734 | ||
735 | if ((new = open (new_name, 2)) < 0) | |
736 | { | |
737 | PERROR (new_name); | |
738 | return -1; | |
739 | } | |
740 | ||
741 | lseek (new, f_hdr.f_symptr, 0); | |
742 | for (nsyms = 0; nsyms < f_hdr.f_nsyms; nsyms++) | |
743 | { | |
744 | read (new, &symentry, SYMESZ); | |
745 | if (symentry.n_numaux) | |
746 | { | |
747 | read (new, &auxentry, AUXESZ); | |
748 | nsyms++; | |
749 | if (ISFCN (symentry.n_type)) { | |
750 | auxentry.x_sym.x_fcnary.x_fcn.x_lnnoptr += bias; | |
751 | lseek (new, -AUXESZ, 1); | |
752 | write (new, &auxentry, AUXESZ); | |
753 | } | |
754 | } | |
755 | } | |
756 | close (new); | |
76998edb JB |
757 | } |
758 | ||
4e3a36cd | 759 | #endif /* COFF */ |
76998edb | 760 | |
4e3a36cd JB |
761 | #ifdef XCOFF |
762 | ||
763 | /* It is probably a false economy to optimise this routine (it used to | |
764 | read one LDREL and do do two lseeks per iteration) but the wrath of | |
765 | RMS (see above :-) would be too much to bear */ | |
766 | ||
767 | unrelocate_symbols (new, a_out, a_name, new_name) | |
768 | int new, a_out; | |
769 | char *a_name, *new_name; | |
76998edb | 770 | { |
4e3a36cd JB |
771 | register int i; |
772 | register int l; | |
773 | register LDREL *ldrel; | |
774 | LDHDR ldhdr; | |
775 | LDREL ldrel_buf [20]; | |
776 | ulong t_start = (ulong) &_text; | |
777 | ulong d_start = (ulong) &_data; | |
778 | int * p; | |
779 | int dirty; | |
780 | ||
781 | if (load_scnptr == 0) | |
782 | return 0; | |
783 | ||
784 | lseek (a_out, orig_load_scnptr, 0); | |
785 | if (read (a_out, &ldhdr, sizeof (ldhdr)) != sizeof (ldhdr)) | |
786 | { | |
787 | PERROR (new_name); | |
788 | } | |
789 | ||
790 | #define SYMNDX_TEXT 0 | |
791 | #define SYMNDX_DATA 1 | |
792 | #define SYMNDX_BSS 2 | |
793 | l = 0; | |
794 | for (i = 0; i < ldhdr.l_nreloc; i++, l--, ldrel++) | |
795 | { | |
796 | if (l == 0) { | |
797 | lseek (a_out, | |
798 | orig_load_scnptr + LDHDRSZ + LDSYMSZ*ldhdr.l_nsyms + LDRELSZ*i, | |
799 | 0); | |
800 | ||
801 | l = ldhdr.l_nreloc - i; | |
802 | if (l > sizeof (ldrel_buf) / LDRELSZ) | |
803 | l = sizeof (ldrel_buf) / LDRELSZ; | |
804 | ||
805 | if (read (a_out, ldrel_buf, l * LDRELSZ) != l * LDRELSZ) | |
806 | { | |
807 | PERROR (a_name); | |
808 | } | |
809 | ldrel = ldrel_buf; | |
810 | } | |
811 | dirty = 0; | |
812 | ||
813 | /* this code may not be necessary */ | |
814 | /* I originally had == in the "assignment" and it still unrelocated */ | |
815 | ||
816 | /* move the BSS loader symbols to the DATA segment */ | |
817 | if (ldrel->l_rsecnm == f_ohdr.o_snbss) | |
818 | ldrel->l_rsecnm = f_ohdr.o_sndata, dirty++; | |
819 | ||
820 | if (ldrel->l_symndx == SYMNDX_BSS) | |
821 | ldrel->l_symndx = SYMNDX_DATA, dirty++; | |
822 | ||
823 | if (dirty) | |
824 | { | |
825 | lseek (new, | |
826 | load_scnptr + LDHDRSZ + LDSYMSZ*ldhdr.l_nsyms + LDRELSZ*i, | |
827 | 0); | |
828 | ||
829 | if (write (new, ldrel, LDRELSZ) != LDRELSZ) | |
830 | { | |
831 | PERROR (new_name); | |
832 | } | |
833 | } | |
834 | ||
835 | if (ldrel->l_rsecnm == f_ohdr.o_sndata) | |
836 | { | |
837 | int orig_int; | |
838 | ||
839 | lseek (a_out, orig_data_scnptr + ldrel->l_vaddr, 0); | |
840 | ||
841 | if (read (a_out, (void *) &orig_int, sizeof (orig_int)) != sizeof (orig_int)) | |
842 | { | |
843 | PERROR (a_name); | |
844 | } | |
845 | ||
846 | switch (ldrel->l_symndx) { | |
847 | case SYMNDX_TEXT: | |
848 | p = (int *) (d_start + ldrel->l_vaddr); | |
849 | orig_int = * p - (t_start - f_ohdr.text_start); | |
850 | break; | |
851 | ||
852 | case SYMNDX_DATA: | |
853 | case SYMNDX_BSS: | |
854 | p = (int *) (d_start + ldrel->l_vaddr); | |
855 | orig_int = * p - (d_start - f_ohdr.data_start); | |
856 | break; | |
857 | } | |
858 | ||
859 | lseek (new, data_scnptr + ldrel->l_vaddr, 0); | |
860 | if (write (new, (void *) &orig_int, sizeof (orig_int)) != sizeof (orig_int)) | |
861 | { | |
862 | PERROR (new_name); | |
863 | } | |
864 | } | |
865 | } | |
76998edb | 866 | } |
4e3a36cd JB |
867 | #endif /* XCOFF */ |
868 | ||
869 | #endif /* not CANNOT_UNEXEC */ | |
870 | ||
871 | #endif /* not CANNOT_DUMP */ |