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7dd63af1 RS |
1 | /* Copyright (C) 1985, 1986, 1987, 1988 Free Software Foundation, Inc. |
2 | ||
3 | This file is part of GNU Emacs. | |
4 | ||
5 | GNU Emacs 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 | GNU Emacs 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 GNU Emacs; see the file COPYING. If not, write to | |
17 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
18 | ||
19 | ||
20 | /* | |
21 | * unexec.c - Convert a running program into an a.out file. | |
22 | * | |
23 | * Author: Spencer W. Thomas | |
24 | * Computer Science Dept. | |
25 | * University of Utah | |
26 | * Date: Tue Mar 2 1982 | |
27 | * Modified heavily since then. | |
28 | * | |
29 | * Synopsis: | |
30 | * unexec (new_name, a_name, data_start, bss_start, entry_address) | |
31 | * char *new_name, *a_name; | |
32 | * unsigned data_start, bss_start, entry_address; | |
33 | * | |
34 | * Takes a snapshot of the program and makes an a.out format file in the | |
35 | * file named by the string argument new_name. | |
36 | * If a_name is non-NULL, the symbol table will be taken from the given file. | |
37 | * On some machines, an existing a_name file is required. | |
38 | * | |
39 | * The boundaries within the a.out file may be adjusted with the data_start | |
40 | * and bss_start arguments. Either or both may be given as 0 for defaults. | |
41 | * | |
42 | * Data_start gives the boundary between the text segment and the data | |
43 | * segment of the program. The text segment can contain shared, read-only | |
44 | * program code and literal data, while the data segment is always unshared | |
45 | * and unprotected. Data_start gives the lowest unprotected address. | |
46 | * The value you specify may be rounded down to a suitable boundary | |
47 | * as required by the machine you are using. | |
48 | * | |
49 | * Specifying zero for data_start means the boundary between text and data | |
50 | * should not be the same as when the program was loaded. | |
51 | * If NO_REMAP is defined, the argument data_start is ignored and the | |
52 | * segment boundaries are never changed. | |
53 | * | |
54 | * Bss_start indicates how much of the data segment is to be saved in the | |
55 | * a.out file and restored when the program is executed. It gives the lowest | |
56 | * unsaved address, and is rounded up to a page boundary. The default when 0 | |
57 | * is given assumes that the entire data segment is to be stored, including | |
58 | * the previous data and bss as well as any additional storage allocated with | |
59 | * break (2). | |
60 | * | |
61 | * The new file is set up to start at entry_address. | |
62 | * | |
63 | * If you make improvements I'd like to get them too. | |
64 | * harpo!utah-cs!thomas, thomas@Utah-20 | |
65 | * | |
66 | */ | |
67 | ||
68 | /* Modified to support SysVr3 shared libraries by James Van Artsdalen | |
69 | * of Dell Computer Corporation. james@bigtex.cactus.org. | |
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 | ||
154 | */ | |
155 | ||
156 | #ifndef emacs | |
157 | #define PERROR(arg) perror (arg); return -1 | |
158 | #else | |
159 | #define IN_UNEXEC | |
160 | #include "config.h" | |
161 | #define PERROR(file) report_error (file, new) | |
162 | #endif | |
163 | ||
164 | #ifndef CANNOT_DUMP /* all rest of file! */ | |
165 | ||
166 | #ifndef CANNOT_UNEXEC /* most of rest of file */ | |
167 | ||
168 | #include <a.out.h> | |
169 | /* Define getpagesize () if the system does not. | |
170 | Note that this may depend on symbols defined in a.out.h | |
171 | */ | |
172 | #include "getpagesize.h" | |
173 | ||
174 | #ifndef makedev /* Try to detect types.h already loaded */ | |
175 | #include <sys/types.h> | |
176 | #endif | |
177 | #include <stdio.h> | |
178 | #include <sys/stat.h> | |
179 | #include <errno.h> | |
180 | ||
181 | extern char *start_of_text (); /* Start of text */ | |
182 | extern char *start_of_data (); /* Start of initialized data */ | |
183 | ||
184 | #ifdef COFF | |
185 | static long block_copy_start; /* Old executable start point */ | |
186 | static struct filehdr f_hdr; /* File header */ | |
187 | static struct aouthdr f_ohdr; /* Optional file header (a.out) */ | |
188 | long bias; /* Bias to add for growth */ | |
189 | long lnnoptr; /* Pointer to line-number info within file */ | |
190 | #define SYMS_START block_copy_start | |
191 | ||
192 | static long text_scnptr; | |
193 | static long data_scnptr; | |
194 | ||
195 | #else /* not COFF */ | |
196 | ||
197 | extern char *sbrk (); | |
198 | ||
199 | #define SYMS_START ((long) N_SYMOFF (ohdr)) | |
200 | ||
201 | /* Some machines override the structure name for an a.out header. */ | |
202 | #ifndef EXEC_HDR_TYPE | |
203 | #define EXEC_HDR_TYPE struct exec | |
204 | #endif | |
205 | ||
206 | #ifdef HPUX | |
207 | #ifdef HP9000S200_ID | |
208 | #define MY_ID HP9000S200_ID | |
209 | #else | |
210 | #include <model.h> | |
211 | #define MY_ID MYSYS | |
212 | #endif /* no HP9000S200_ID */ | |
213 | static MAGIC OLDMAGIC = {MY_ID, SHARE_MAGIC}; | |
214 | static MAGIC NEWMAGIC = {MY_ID, DEMAND_MAGIC}; | |
215 | #define N_TXTOFF(x) TEXT_OFFSET(x) | |
216 | #define N_SYMOFF(x) LESYM_OFFSET(x) | |
217 | static EXEC_HDR_TYPE hdr, ohdr; | |
218 | ||
219 | #else /* not HPUX */ | |
220 | ||
221 | #if defined (USG) && !defined (IBMAIX) && !defined (IRIS) | |
222 | static struct bhdr hdr, ohdr; | |
223 | #define a_magic fmagic | |
224 | #define a_text tsize | |
225 | #define a_data dsize | |
226 | #define a_bss bsize | |
227 | #define a_syms ssize | |
228 | #define a_trsize rtsize | |
229 | #define a_drsize rdsize | |
230 | #define a_entry entry | |
231 | #define N_BADMAG(x) \ | |
232 | (((x).fmagic)!=OMAGIC && ((x).fmagic)!=NMAGIC &&\ | |
233 | ((x).fmagic)!=FMAGIC && ((x).fmagic)!=IMAGIC) | |
234 | #define NEWMAGIC FMAGIC | |
235 | #else /* IRIS or IBMAIX or not USG */ | |
236 | static EXEC_HDR_TYPE hdr, ohdr; | |
237 | #define NEWMAGIC ZMAGIC | |
238 | #endif /* IRIS or IBMAIX not USG */ | |
239 | #endif /* not HPUX */ | |
240 | ||
241 | static int unexec_text_start; | |
242 | static int unexec_data_start; | |
243 | ||
244 | #endif /* not COFF */ | |
245 | ||
246 | static int pagemask; | |
247 | ||
248 | /* Correct an int which is the bit pattern of a pointer to a byte | |
249 | into an int which is the number of a byte. | |
250 | This is a no-op on ordinary machines, but not on all. */ | |
251 | ||
252 | #ifndef ADDR_CORRECT /* Let m-*.h files override this definition */ | |
253 | #define ADDR_CORRECT(x) ((char *)(x) - (char*)0) | |
254 | #endif | |
255 | ||
256 | #ifdef emacs | |
257 | ||
258 | static | |
259 | report_error (file, fd) | |
260 | char *file; | |
261 | int fd; | |
262 | { | |
263 | if (fd) | |
264 | close (fd); | |
265 | error ("Failure operating on %s\n", file); | |
266 | } | |
267 | #endif /* emacs */ | |
268 | ||
269 | #define ERROR0(msg) report_error_1 (new, msg, 0, 0); return -1 | |
270 | #define ERROR1(msg,x) report_error_1 (new, msg, x, 0); return -1 | |
271 | #define ERROR2(msg,x,y) report_error_1 (new, msg, x, y); return -1 | |
272 | ||
273 | static | |
274 | report_error_1 (fd, msg, a1, a2) | |
275 | int fd; | |
276 | char *msg; | |
277 | int a1, a2; | |
278 | { | |
279 | close (fd); | |
280 | #ifdef emacs | |
281 | error (msg, a1, a2); | |
282 | #else | |
283 | fprintf (stderr, msg, a1, a2); | |
284 | fprintf (stderr, "\n"); | |
285 | #endif | |
286 | } | |
287 | \f | |
288 | static int make_hdr (); | |
289 | static int copy_text_and_data (); | |
290 | static int copy_sym (); | |
291 | static void mark_x (); | |
292 | ||
293 | /* **************************************************************** | |
294 | * unexec | |
295 | * | |
296 | * driving logic. | |
297 | */ | |
298 | unexec (new_name, a_name, data_start, bss_start, entry_address) | |
299 | char *new_name, *a_name; | |
300 | unsigned data_start, bss_start, entry_address; | |
301 | { | |
302 | int new, a_out = -1; | |
303 | ||
304 | if (a_name && (a_out = open (a_name, 0)) < 0) | |
305 | { | |
306 | PERROR (a_name); | |
307 | } | |
308 | if ((new = creat (new_name, 0666)) < 0) | |
309 | { | |
310 | PERROR (new_name); | |
311 | } | |
312 | ||
313 | if (make_hdr (new, a_out, data_start, bss_start, entry_address, a_name, new_name) < 0 | |
314 | || copy_text_and_data (new, a_out) < 0 | |
315 | || copy_sym (new, a_out, a_name, new_name) < 0 | |
316 | #ifdef COFF | |
317 | #ifndef COFF_BSD_SYMBOLS | |
318 | || adjust_lnnoptrs (new, a_out, new_name) < 0 | |
319 | #endif | |
320 | #endif | |
321 | ) | |
322 | { | |
323 | close (new); | |
324 | /* unlink (new_name); /* Failed, unlink new a.out */ | |
325 | return -1; | |
326 | } | |
327 | ||
328 | close (new); | |
329 | if (a_out >= 0) | |
330 | close (a_out); | |
331 | mark_x (new_name); | |
332 | return 0; | |
333 | } | |
334 | ||
335 | /* **************************************************************** | |
336 | * make_hdr | |
337 | * | |
338 | * Make the header in the new a.out from the header in core. | |
339 | * Modify the text and data sizes. | |
340 | */ | |
341 | static int | |
342 | make_hdr (new, a_out, data_start, bss_start, entry_address, a_name, new_name) | |
343 | int new, a_out; | |
344 | unsigned data_start, bss_start, entry_address; | |
345 | char *a_name; | |
346 | char *new_name; | |
347 | { | |
348 | int tem; | |
349 | #ifdef COFF | |
350 | auto struct scnhdr f_thdr; /* Text section header */ | |
351 | auto struct scnhdr f_dhdr; /* Data section header */ | |
352 | auto struct scnhdr f_bhdr; /* Bss section header */ | |
353 | auto struct scnhdr scntemp; /* Temporary section header */ | |
354 | register int scns; | |
355 | #endif /* COFF */ | |
356 | #ifdef USG_SHARED_LIBRARIES | |
357 | extern unsigned int bss_end; | |
358 | #else | |
359 | unsigned int bss_end; | |
360 | #endif | |
361 | ||
362 | pagemask = getpagesize () - 1; | |
363 | ||
364 | /* Adjust text/data boundary. */ | |
365 | #ifdef NO_REMAP | |
366 | data_start = (int) start_of_data (); | |
367 | #else /* not NO_REMAP */ | |
368 | if (!data_start) | |
369 | data_start = (int) start_of_data (); | |
370 | #endif /* not NO_REMAP */ | |
371 | data_start = ADDR_CORRECT (data_start); | |
372 | ||
373 | #ifdef SEGMENT_MASK | |
374 | data_start = data_start & ~SEGMENT_MASK; /* (Down) to segment boundary. */ | |
375 | #else | |
376 | data_start = data_start & ~pagemask; /* (Down) to page boundary. */ | |
377 | #endif | |
378 | ||
379 | bss_end = ADDR_CORRECT (sbrk (0)) + pagemask; | |
380 | bss_end &= ~ pagemask; | |
381 | ||
382 | /* Adjust data/bss boundary. */ | |
383 | if (bss_start != 0) | |
384 | { | |
385 | bss_start = (ADDR_CORRECT (bss_start) + pagemask); | |
386 | /* (Up) to page bdry. */ | |
387 | bss_start &= ~ pagemask; | |
388 | if (bss_start > bss_end) | |
389 | { | |
390 | ERROR1 ("unexec: Specified bss_start (%u) is past end of program", | |
391 | bss_start); | |
392 | } | |
393 | } | |
394 | else | |
395 | bss_start = bss_end; | |
396 | ||
397 | if (data_start > bss_start) /* Can't have negative data size. */ | |
398 | { | |
399 | ERROR2 ("unexec: data_start (%u) can't be greater than bss_start (%u)", | |
400 | data_start, bss_start); | |
401 | } | |
402 | ||
403 | #ifdef COFF | |
404 | /* Salvage as much info from the existing file as possible */ | |
405 | if (a_out >= 0) | |
406 | { | |
407 | if (read (a_out, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) | |
408 | { | |
409 | PERROR (a_name); | |
410 | } | |
411 | block_copy_start += sizeof (f_hdr); | |
412 | if (f_hdr.f_opthdr > 0) | |
413 | { | |
414 | if (read (a_out, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) | |
415 | { | |
416 | PERROR (a_name); | |
417 | } | |
418 | block_copy_start += sizeof (f_ohdr); | |
419 | } | |
420 | /* Loop through section headers, copying them in */ | |
421 | for (scns = f_hdr.f_nscns; scns > 0; scns--) { | |
422 | if (read (a_out, &scntemp, sizeof (scntemp)) != sizeof (scntemp)) | |
423 | { | |
424 | PERROR (a_name); | |
425 | } | |
426 | if (scntemp.s_scnptr > 0L) | |
427 | { | |
428 | if (block_copy_start < scntemp.s_scnptr + scntemp.s_size) | |
429 | block_copy_start = scntemp.s_scnptr + scntemp.s_size; | |
430 | } | |
431 | if (strcmp (scntemp.s_name, ".text") == 0) | |
432 | { | |
433 | f_thdr = scntemp; | |
434 | } | |
435 | else if (strcmp (scntemp.s_name, ".data") == 0) | |
436 | { | |
437 | f_dhdr = scntemp; | |
438 | } | |
439 | else if (strcmp (scntemp.s_name, ".bss") == 0) | |
440 | { | |
441 | f_bhdr = scntemp; | |
442 | } | |
443 | } | |
444 | } | |
445 | else | |
446 | { | |
447 | ERROR0 ("can't build a COFF file from scratch yet"); | |
448 | } | |
449 | ||
450 | /* Now we alter the contents of all the f_*hdr variables | |
451 | to correspond to what we want to dump. */ | |
452 | ||
453 | #ifdef USG_SHARED_LIBRARIES | |
454 | ||
455 | /* The amount of data we're adding to the file is distance from the | |
456 | * end of the original .data space to the current end of the .data | |
457 | * space. | |
458 | */ | |
459 | ||
460 | bias = bss_end - (f_ohdr.data_start + f_dhdr.s_size); | |
461 | ||
462 | #endif | |
463 | ||
464 | f_hdr.f_flags |= (F_RELFLG | F_EXEC); | |
465 | #ifdef TPIX | |
466 | f_hdr.f_nscns = 3; | |
467 | #endif | |
468 | #ifdef EXEC_MAGIC | |
469 | f_ohdr.magic = EXEC_MAGIC; | |
470 | #endif | |
471 | #ifndef NO_REMAP | |
472 | f_ohdr.text_start = (long) start_of_text (); | |
473 | f_ohdr.tsize = data_start - f_ohdr.text_start; | |
474 | f_ohdr.data_start = data_start; | |
475 | #endif /* NO_REMAP */ | |
476 | f_ohdr.dsize = bss_start - f_ohdr.data_start; | |
477 | f_ohdr.bsize = bss_end - bss_start; | |
478 | #ifndef KEEP_OLD_TEXT_SCNPTR | |
479 | /* On some machines, the old values are right. | |
480 | ??? Maybe on all machines with NO_REMAP. */ | |
481 | f_thdr.s_size = f_ohdr.tsize; | |
482 | f_thdr.s_scnptr = sizeof (f_hdr) + sizeof (f_ohdr); | |
483 | f_thdr.s_scnptr += (f_hdr.f_nscns) * (sizeof (f_thdr)); | |
484 | #endif /* KEEP_OLD_TEXT_SCNPTR */ | |
485 | #ifdef ADJUST_TEXT_SCNHDR_SIZE | |
486 | /* On some machines, `text size' includes all headers. */ | |
487 | f_thdr.s_size -= f_thdr.s_scnptr; | |
488 | #endif /* ADJUST_TEST_SCNHDR_SIZE */ | |
489 | lnnoptr = f_thdr.s_lnnoptr; | |
490 | #ifdef SECTION_ALIGNMENT | |
491 | /* Some systems require special alignment | |
492 | of the sections in the file itself. */ | |
493 | f_thdr.s_scnptr | |
494 | = (f_thdr.s_scnptr + SECTION_ALIGNMENT) & ~SECTION_ALIGNMENT; | |
495 | #endif /* SECTION_ALIGNMENT */ | |
496 | #ifdef TPIX | |
497 | f_thdr.s_scnptr = 0xd0; | |
498 | #endif | |
499 | text_scnptr = f_thdr.s_scnptr; | |
500 | #ifdef ADJUST_TEXTBASE | |
501 | text_scnptr = sizeof (f_hdr) + sizeof (f_ohdr) + (f_hdr.f_nscns) * (sizeof (f_thdr)); | |
502 | #endif | |
503 | #ifndef KEEP_OLD_PADDR | |
504 | f_dhdr.s_paddr = f_ohdr.data_start; | |
505 | #endif /* KEEP_OLD_PADDR */ | |
506 | f_dhdr.s_vaddr = f_ohdr.data_start; | |
507 | f_dhdr.s_size = f_ohdr.dsize; | |
508 | f_dhdr.s_scnptr = f_thdr.s_scnptr + f_thdr.s_size; | |
509 | #ifdef SECTION_ALIGNMENT | |
510 | /* Some systems require special alignment | |
511 | of the sections in the file itself. */ | |
512 | f_dhdr.s_scnptr | |
513 | = (f_dhdr.s_scnptr + SECTION_ALIGNMENT) & ~SECTION_ALIGNMENT; | |
514 | #endif /* SECTION_ALIGNMENT */ | |
515 | #ifdef DATA_SECTION_ALIGNMENT | |
516 | /* Some systems require special alignment | |
517 | of the data section only. */ | |
518 | f_dhdr.s_scnptr | |
519 | = (f_dhdr.s_scnptr + DATA_SECTION_ALIGNMENT) & ~DATA_SECTION_ALIGNMENT; | |
520 | #endif /* DATA_SECTION_ALIGNMENT */ | |
521 | data_scnptr = f_dhdr.s_scnptr; | |
522 | #ifndef KEEP_OLD_PADDR | |
523 | f_bhdr.s_paddr = f_ohdr.data_start + f_ohdr.dsize; | |
524 | #endif /* KEEP_OLD_PADDR */ | |
525 | f_bhdr.s_vaddr = f_ohdr.data_start + f_ohdr.dsize; | |
526 | f_bhdr.s_size = f_ohdr.bsize; | |
527 | f_bhdr.s_scnptr = 0L; | |
528 | #ifndef USG_SHARED_LIBRARIES | |
529 | bias = f_dhdr.s_scnptr + f_dhdr.s_size - block_copy_start; | |
530 | #endif | |
531 | ||
532 | if (f_hdr.f_symptr > 0L) | |
533 | { | |
534 | f_hdr.f_symptr += bias; | |
535 | } | |
536 | ||
537 | if (f_thdr.s_lnnoptr > 0L) | |
538 | { | |
539 | f_thdr.s_lnnoptr += bias; | |
540 | } | |
541 | ||
542 | #ifdef ADJUST_EXEC_HEADER | |
543 | ADJUST_EXEC_HEADER; | |
544 | #endif /* ADJUST_EXEC_HEADER */ | |
545 | ||
546 | if (write (new, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) | |
547 | { | |
548 | PERROR (new_name); | |
549 | } | |
550 | ||
551 | if (write (new, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) | |
552 | { | |
553 | PERROR (new_name); | |
554 | } | |
555 | ||
556 | #ifndef USG_SHARED_LIBRARIES | |
557 | ||
558 | if (write (new, &f_thdr, sizeof (f_thdr)) != sizeof (f_thdr)) | |
559 | { | |
560 | PERROR (new_name); | |
561 | } | |
562 | ||
563 | if (write (new, &f_dhdr, sizeof (f_dhdr)) != sizeof (f_dhdr)) | |
564 | { | |
565 | PERROR (new_name); | |
566 | } | |
567 | ||
568 | if (write (new, &f_bhdr, sizeof (f_bhdr)) != sizeof (f_bhdr)) | |
569 | { | |
570 | PERROR (new_name); | |
571 | } | |
572 | ||
573 | #else /* USG_SHARED_LIBRARIES */ | |
574 | ||
575 | /* The purpose of this code is to write out the new file's section | |
576 | * header table. | |
577 | * | |
578 | * Scan through the original file's sections. If the encountered | |
579 | * section is one we know (.text, .data or .bss), write out the | |
580 | * correct header. If it is a section we do not know (such as | |
581 | * .lib), adjust the address of where the section data is in the | |
582 | * file, and write out the header. | |
583 | * | |
584 | * If any section preceeds .text or .data in the file, this code | |
585 | * will not adjust the file pointer for that section correctly. | |
586 | */ | |
587 | ||
588 | lseek (a_out, sizeof (f_hdr) + sizeof (f_ohdr), 0); | |
589 | ||
590 | for (scns = f_hdr.f_nscns; scns > 0; scns--) | |
591 | { | |
592 | if (read (a_out, &scntemp, sizeof (scntemp)) != sizeof (scntemp)) | |
593 | PERROR (a_name); | |
594 | ||
595 | if (!strcmp (scntemp.s_name, f_thdr.s_name)) /* .text */ | |
596 | { | |
597 | if (write (new, &f_thdr, sizeof (f_thdr)) != sizeof (f_thdr)) | |
598 | PERROR (new_name); | |
599 | } | |
600 | else if (!strcmp (scntemp.s_name, f_dhdr.s_name)) /* .data */ | |
601 | { | |
602 | if (write (new, &f_dhdr, sizeof (f_dhdr)) != sizeof (f_dhdr)) | |
603 | PERROR (new_name); | |
604 | } | |
605 | else if (!strcmp (scntemp.s_name, f_bhdr.s_name)) /* .bss */ | |
606 | { | |
607 | if (write (new, &f_bhdr, sizeof (f_bhdr)) != sizeof (f_bhdr)) | |
608 | PERROR (new_name); | |
609 | } | |
610 | else | |
611 | { | |
612 | if (scntemp.s_scnptr) | |
613 | scntemp.s_scnptr += bias; | |
614 | if (write (new, &scntemp, sizeof (scntemp)) != sizeof (scntemp)) | |
615 | PERROR (new_name); | |
616 | } | |
617 | } | |
618 | #endif /* USG_SHARED_LIBRARIES */ | |
619 | ||
620 | return (0); | |
621 | ||
622 | #else /* if not COFF */ | |
623 | ||
624 | /* Get symbol table info from header of a.out file if given one. */ | |
625 | if (a_out >= 0) | |
626 | { | |
627 | if (read (a_out, &ohdr, sizeof hdr) != sizeof hdr) | |
628 | { | |
629 | PERROR (a_name); | |
630 | } | |
631 | ||
632 | if (N_BADMAG (ohdr)) | |
633 | { | |
634 | ERROR1 ("invalid magic number in %s", a_name); | |
635 | } | |
636 | hdr = ohdr; | |
637 | } | |
638 | else | |
639 | { | |
640 | bzero (hdr, sizeof hdr); | |
641 | } | |
642 | ||
643 | unexec_text_start = (long) start_of_text (); | |
644 | unexec_data_start = data_start; | |
645 | ||
646 | /* Machine-dependent fixup for header, or maybe for unexec_text_start */ | |
647 | #ifdef ADJUST_EXEC_HEADER | |
648 | ADJUST_EXEC_HEADER; | |
649 | #endif /* ADJUST_EXEC_HEADER */ | |
650 | ||
651 | hdr.a_trsize = 0; | |
652 | hdr.a_drsize = 0; | |
653 | if (entry_address != 0) | |
654 | hdr.a_entry = entry_address; | |
655 | ||
656 | hdr.a_bss = bss_end - bss_start; | |
657 | hdr.a_data = bss_start - data_start; | |
658 | #ifdef NO_REMAP | |
659 | hdr.a_text = ohdr.a_text; | |
660 | #else /* not NO_REMAP */ | |
661 | hdr.a_text = data_start - unexec_text_start; | |
662 | ||
663 | #ifdef A_TEXT_OFFSET | |
664 | hdr.a_text += A_TEXT_OFFSET (ohdr); | |
665 | #endif | |
666 | ||
667 | #endif /* not NO_REMAP */ | |
668 | ||
669 | if (write (new, &hdr, sizeof hdr) != sizeof hdr) | |
670 | { | |
671 | PERROR (new_name); | |
672 | } | |
673 | ||
674 | #ifdef A_TEXT_OFFSET | |
675 | hdr.a_text -= A_TEXT_OFFSET (ohdr); | |
676 | #endif | |
677 | ||
678 | return 0; | |
679 | ||
680 | #endif /* not COFF */ | |
681 | } | |
682 | \f | |
683 | /* **************************************************************** | |
684 | * copy_text_and_data | |
685 | * | |
686 | * Copy the text and data segments from memory to the new a.out | |
687 | */ | |
688 | static int | |
689 | copy_text_and_data (new, a_out) | |
690 | int new, a_out; | |
691 | { | |
692 | register char *end; | |
693 | register char *ptr; | |
694 | ||
695 | #ifdef COFF | |
696 | ||
697 | #ifdef USG_SHARED_LIBRARIES | |
698 | ||
699 | int scns; | |
700 | struct scnhdr scntemp; /* Temporary section header */ | |
701 | ||
702 | /* The purpose of this code is to write out the new file's section | |
703 | * contents. | |
704 | * | |
705 | * Step through the section table. If we know the section (.text, | |
706 | * .data) do the appropriate thing. Otherwise, if the section has | |
707 | * no allocated space in the file (.bss), do nothing. Otherwise, | |
708 | * the section has space allocated in the file, and is not a section | |
709 | * we know. So just copy it. | |
710 | */ | |
711 | ||
712 | lseek (a_out, sizeof (struct filehdr) + sizeof (struct aouthdr), 0); | |
713 | ||
714 | for (scns = f_hdr.f_nscns; scns > 0; scns--) | |
715 | { | |
716 | if (read (a_out, &scntemp, sizeof (scntemp)) != sizeof (scntemp)) | |
717 | PERROR ("temacs"); | |
718 | ||
719 | if (!strcmp (scntemp.s_name, ".text")) | |
720 | { | |
721 | lseek (new, (long) text_scnptr, 0); | |
722 | ptr = (char *) f_ohdr.text_start; | |
723 | end = ptr + f_ohdr.tsize; | |
724 | write_segment (new, ptr, end); | |
725 | } | |
726 | else if (!strcmp (scntemp.s_name, ".data")) | |
727 | { | |
728 | lseek (new, (long) data_scnptr, 0); | |
729 | ptr = (char *) f_ohdr.data_start; | |
730 | end = ptr + f_ohdr.dsize; | |
731 | write_segment (new, ptr, end); | |
732 | } | |
733 | else if (!scntemp.s_scnptr) | |
734 | ; /* do nothing - no data for this section */ | |
735 | else | |
736 | { | |
737 | char page[BUFSIZ]; | |
738 | int size, n; | |
739 | long old_a_out_ptr = lseek (a_out, 0, 1); | |
740 | ||
741 | lseek (a_out, scntemp.s_scnptr, 0); | |
742 | for (size = scntemp.s_size; size > 0; size -= sizeof (page)) | |
743 | { | |
744 | n = size > sizeof (page) ? sizeof (page) : size; | |
745 | if (read (a_out, page, n) != n || write (new, page, n) != n) | |
746 | PERROR ("xemacs"); | |
747 | } | |
748 | lseek (a_out, old_a_out_ptr, 0); | |
749 | } | |
750 | } | |
751 | ||
752 | #else /* COFF, but not USG_SHARED_LIBRARIES */ | |
753 | ||
754 | lseek (new, (long) text_scnptr, 0); | |
755 | ptr = (char *) f_ohdr.text_start; | |
756 | #ifdef HEADER_INCL_IN_TEXT | |
757 | /* For Gould UTX/32, text starts after headers */ | |
758 | ptr = (char *) (ptr + text_scnptr); | |
759 | #endif /* HEADER_INCL_IN_TEXT */ | |
760 | end = ptr + f_ohdr.tsize; | |
761 | write_segment (new, ptr, end); | |
762 | ||
763 | lseek (new, (long) data_scnptr, 0); | |
764 | ptr = (char *) f_ohdr.data_start; | |
765 | end = ptr + f_ohdr.dsize; | |
766 | write_segment (new, ptr, end); | |
767 | ||
768 | #endif /* USG_SHARED_LIBRARIES */ | |
769 | ||
770 | #else /* if not COFF */ | |
771 | ||
772 | /* Some machines count the header as part of the text segment. | |
773 | That is to say, the header appears in core | |
774 | just before the address that start_of_text () returns. | |
775 | For them, N_TXTOFF is the place where the header goes. | |
776 | We must adjust the seek to the place after the header. | |
777 | Note that at this point hdr.a_text does *not* count | |
778 | the extra A_TEXT_OFFSET bytes, only the actual bytes of code. */ | |
779 | ||
780 | #ifdef A_TEXT_SEEK | |
781 | lseek (new, (long) A_TEXT_SEEK (hdr), 0); | |
782 | #else | |
783 | lseek (new, (long) N_TXTOFF (hdr), 0); | |
784 | #endif /* no A_TEXT_SEEK */ | |
785 | ||
786 | ptr = (char *) unexec_text_start; | |
787 | end = ptr + hdr.a_text; | |
788 | write_segment (new, ptr, end); | |
789 | ||
790 | ptr = (char *) unexec_data_start; | |
791 | end = ptr + hdr.a_data; | |
792 | /* This lseek is certainly incorrect when A_TEXT_OFFSET | |
793 | and I believe it is a no-op otherwise. | |
794 | Let's see if its absence ever fails. */ | |
795 | /* lseek (new, (long) N_TXTOFF (hdr) + hdr.a_text, 0); */ | |
796 | write_segment (new, ptr, end); | |
797 | ||
798 | #endif /* not COFF */ | |
799 | ||
800 | return 0; | |
801 | } | |
802 | ||
803 | write_segment (new, ptr, end) | |
804 | int new; | |
805 | register char *ptr, *end; | |
806 | { | |
807 | register int i, nwrite, ret; | |
808 | char buf[80]; | |
809 | extern int errno; | |
810 | char zeros[128]; | |
811 | ||
812 | bzero (zeros, sizeof zeros); | |
813 | ||
814 | for (i = 0; ptr < end;) | |
815 | { | |
816 | /* distance to next multiple of 128. */ | |
817 | nwrite = (((int) ptr + 128) & -128) - (int) ptr; | |
818 | /* But not beyond specified end. */ | |
819 | if (nwrite > end - ptr) nwrite = end - ptr; | |
820 | ret = write (new, ptr, nwrite); | |
821 | /* If write gets a page fault, it means we reached | |
822 | a gap between the old text segment and the old data segment. | |
823 | This gap has probably been remapped into part of the text segment. | |
824 | So write zeros for it. */ | |
825 | if (ret == -1 && errno == EFAULT) | |
826 | write (new, zeros, nwrite); | |
827 | else if (nwrite != ret) | |
828 | { | |
829 | sprintf (buf, | |
830 | "unexec write failure: addr 0x%x, fileno %d, size 0x%x, wrote 0x%x, errno %d", | |
831 | ptr, new, nwrite, ret, errno); | |
832 | PERROR (buf); | |
833 | } | |
834 | i += nwrite; | |
835 | ptr += nwrite; | |
836 | } | |
837 | } | |
838 | \f | |
839 | /* **************************************************************** | |
840 | * copy_sym | |
841 | * | |
842 | * Copy the relocation information and symbol table from the a.out to the new | |
843 | */ | |
844 | static int | |
845 | copy_sym (new, a_out, a_name, new_name) | |
846 | int new, a_out; | |
847 | char *a_name, *new_name; | |
848 | { | |
849 | char page[1024]; | |
850 | int n; | |
851 | ||
852 | if (a_out < 0) | |
853 | return 0; | |
854 | ||
855 | #ifdef COFF | |
856 | if (SYMS_START == 0L) | |
857 | return 0; | |
858 | #endif /* COFF */ | |
859 | ||
860 | #ifdef COFF | |
861 | if (lnnoptr) /* if there is line number info */ | |
862 | lseek (a_out, lnnoptr, 0); /* start copying from there */ | |
863 | else | |
864 | #endif /* COFF */ | |
865 | lseek (a_out, SYMS_START, 0); /* Position a.out to symtab. */ | |
866 | ||
867 | while ((n = read (a_out, page, sizeof page)) > 0) | |
868 | { | |
869 | if (write (new, page, n) != n) | |
870 | { | |
871 | PERROR (new_name); | |
872 | } | |
873 | } | |
874 | if (n < 0) | |
875 | { | |
876 | PERROR (a_name); | |
877 | } | |
878 | return 0; | |
879 | } | |
880 | \f | |
881 | /* **************************************************************** | |
882 | * mark_x | |
883 | * | |
884 | * After succesfully building the new a.out, mark it executable | |
885 | */ | |
886 | static void | |
887 | mark_x (name) | |
888 | char *name; | |
889 | { | |
890 | struct stat sbuf; | |
891 | int um; | |
892 | int new = 0; /* for PERROR */ | |
893 | ||
894 | um = umask (777); | |
895 | umask (um); | |
896 | if (stat (name, &sbuf) == -1) | |
897 | { | |
898 | PERROR (name); | |
899 | } | |
900 | sbuf.st_mode |= 0111 & ~um; | |
901 | if (chmod (name, sbuf.st_mode) == -1) | |
902 | PERROR (name); | |
903 | } | |
904 | \f | |
905 | #ifdef COFF | |
906 | #ifndef COFF_BSD_SYMBOLS | |
907 | ||
908 | /* | |
909 | * If the COFF file contains a symbol table and a line number section, | |
910 | * then any auxiliary entries that have values for x_lnnoptr must | |
911 | * be adjusted by the amount that the line number section has moved | |
912 | * in the file (bias computed in make_hdr). The #@$%&* designers of | |
913 | * the auxiliary entry structures used the absolute file offsets for | |
914 | * the line number entry rather than an offset from the start of the | |
915 | * line number section! | |
916 | * | |
917 | * When I figure out how to scan through the symbol table and pick out | |
918 | * the auxiliary entries that need adjustment, this routine will | |
919 | * be fixed. As it is now, all such entries are wrong and sdb | |
920 | * will complain. Fred Fish, UniSoft Systems Inc. | |
921 | */ | |
922 | ||
923 | /* This function is probably very slow. Instead of reopening the new | |
924 | file for input and output it should copy from the old to the new | |
925 | using the two descriptors already open (WRITEDESC and READDESC). | |
926 | Instead of reading one small structure at a time it should use | |
927 | a reasonable size buffer. But I don't have time to work on such | |
928 | things, so I am installing it as submitted to me. -- RMS. */ | |
929 | ||
930 | adjust_lnnoptrs (writedesc, readdesc, new_name) | |
931 | int writedesc; | |
932 | int readdesc; | |
933 | char *new_name; | |
934 | { | |
935 | register int nsyms; | |
936 | register int new; | |
937 | #ifdef amdahl_uts | |
938 | SYMENT symentry; | |
939 | AUXENT auxentry; | |
940 | #else | |
941 | struct syment symentry; | |
942 | union auxent auxentry; | |
943 | #endif | |
944 | ||
945 | if (!lnnoptr || !f_hdr.f_symptr) | |
946 | return 0; | |
947 | ||
948 | if ((new = open (new_name, 2)) < 0) | |
949 | { | |
950 | PERROR (new_name); | |
951 | return -1; | |
952 | } | |
953 | ||
954 | lseek (new, f_hdr.f_symptr, 0); | |
955 | for (nsyms = 0; nsyms < f_hdr.f_nsyms; nsyms++) | |
956 | { | |
957 | read (new, &symentry, SYMESZ); | |
958 | if (symentry.n_numaux) | |
959 | { | |
960 | read (new, &auxentry, AUXESZ); | |
961 | nsyms++; | |
962 | if (ISFCN (symentry.n_type)) { | |
963 | auxentry.x_sym.x_fcnary.x_fcn.x_lnnoptr += bias; | |
964 | lseek (new, -AUXESZ, 1); | |
965 | write (new, &auxentry, AUXESZ); | |
966 | } | |
967 | } | |
968 | } | |
969 | close (new); | |
970 | } | |
971 | ||
972 | #endif /* COFF_BSD_SYMBOLS */ | |
973 | ||
974 | #endif /* COFF */ | |
975 | ||
976 | #endif /* not CANNOT_UNEXEC */ | |
977 | ||
978 | #endif /* not CANNOT_DUMP */ |