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f31fe472 | 1 | /* Copyright (C) 1985, 1986, 1987, 1988, 1992, 1993 Free Software Foundation, Inc. |
7dd63af1 RS |
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 | |
f31fe472 | 7 | the Free Software Foundation; either version 2, or (at your option) |
7dd63af1 RS |
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. | |
265a9e55 JB |
77 | |
78 | * COFF_ENCAPSULATE | |
79 | ||
80 | Define this if you are using the GNU coff encapsulated a.out format. | |
81 | This is closer to a.out than COFF. You should *not* define COFF if | |
82 | you define COFF_ENCAPSULATE | |
83 | ||
7dd63af1 RS |
84 | Otherwise we assume you use Berkeley format. |
85 | ||
86 | * NO_REMAP | |
87 | ||
88 | Define this if you do not want to try to save Emacs's pure data areas | |
89 | as part of the text segment. | |
90 | ||
91 | Saving them as text is good because it allows users to share more. | |
92 | ||
93 | However, on machines that locate the text area far from the data area, | |
94 | the boundary cannot feasibly be moved. Such machines require | |
95 | NO_REMAP. | |
96 | ||
97 | Also, remapping can cause trouble with the built-in startup routine | |
98 | /lib/crt0.o, which defines `environ' as an initialized variable. | |
99 | Dumping `environ' as pure does not work! So, to use remapping, | |
100 | you must write a startup routine for your machine in Emacs's crt0.c. | |
101 | If NO_REMAP is defined, Emacs uses the system's crt0.o. | |
102 | ||
103 | * SECTION_ALIGNMENT | |
104 | ||
105 | Some machines that use COFF executables require that each section | |
106 | start on a certain boundary *in the COFF file*. Such machines should | |
107 | define SECTION_ALIGNMENT to a mask of the low-order bits that must be | |
108 | zero on such a boundary. This mask is used to control padding between | |
109 | segments in the COFF file. | |
110 | ||
111 | If SECTION_ALIGNMENT is not defined, the segments are written | |
112 | consecutively with no attempt at alignment. This is right for | |
113 | unmodified system V. | |
114 | ||
115 | * SEGMENT_MASK | |
116 | ||
117 | Some machines require that the beginnings and ends of segments | |
118 | *in core* be on certain boundaries. For most machines, a page | |
119 | boundary is sufficient. That is the default. When a larger | |
120 | boundary is needed, define SEGMENT_MASK to a mask of | |
121 | the bits that must be zero on such a boundary. | |
122 | ||
123 | * A_TEXT_OFFSET(HDR) | |
124 | ||
125 | Some machines count the a.out header as part of the size of the text | |
126 | segment (a_text); they may actually load the header into core as the | |
127 | first data in the text segment. Some have additional padding between | |
128 | the header and the real text of the program that is counted in a_text. | |
129 | ||
130 | For these machines, define A_TEXT_OFFSET(HDR) to examine the header | |
131 | structure HDR and return the number of bytes to add to `a_text' | |
132 | before writing it (above and beyond the number of bytes of actual | |
133 | program text). HDR's standard fields are already correct, except that | |
134 | this adjustment to the `a_text' field has not yet been made; | |
135 | thus, the amount of offset can depend on the data in the file. | |
136 | ||
137 | * A_TEXT_SEEK(HDR) | |
138 | ||
139 | If defined, this macro specifies the number of bytes to seek into the | |
140 | a.out file before starting to write the text segment.a | |
141 | ||
142 | * EXEC_MAGIC | |
143 | ||
144 | For machines using COFF, this macro, if defined, is a value stored | |
145 | into the magic number field of the output file. | |
146 | ||
147 | * ADJUST_EXEC_HEADER | |
148 | ||
149 | This macro can be used to generate statements to adjust or | |
150 | initialize nonstandard fields in the file header | |
151 | ||
152 | * ADDR_CORRECT(ADDR) | |
153 | ||
154 | Macro to correct an int which is the bit pattern of a pointer to a byte | |
155 | into an int which is the number of a byte. | |
156 | ||
157 | This macro has a default definition which is usually right. | |
158 | This default definition is a no-op on most machines (where a | |
159 | pointer looks like an int) but not on all machines. | |
160 | ||
161 | */ | |
162 | ||
163 | #ifndef emacs | |
164 | #define PERROR(arg) perror (arg); return -1 | |
165 | #else | |
166 | #define IN_UNEXEC | |
18160b98 | 167 | #include <config.h> |
7dd63af1 RS |
168 | #define PERROR(file) report_error (file, new) |
169 | #endif | |
170 | ||
171 | #ifndef CANNOT_DUMP /* all rest of file! */ | |
172 | ||
173 | #ifndef CANNOT_UNEXEC /* most of rest of file */ | |
174 | ||
265a9e55 JB |
175 | #ifdef COFF_ENCAPSULATE |
176 | int need_coff_header = 1; | |
177 | #include <coff-encap/a.out.encap.h> /* The location might be a poor assumption */ | |
178 | #else | |
7dd63af1 | 179 | #include <a.out.h> |
265a9e55 JB |
180 | #endif |
181 | ||
7dd63af1 RS |
182 | /* Define getpagesize () if the system does not. |
183 | Note that this may depend on symbols defined in a.out.h | |
184 | */ | |
185 | #include "getpagesize.h" | |
186 | ||
187 | #ifndef makedev /* Try to detect types.h already loaded */ | |
188 | #include <sys/types.h> | |
265a9e55 | 189 | #endif /* makedev */ |
7dd63af1 RS |
190 | #include <stdio.h> |
191 | #include <sys/stat.h> | |
192 | #include <errno.h> | |
193 | ||
194 | extern char *start_of_text (); /* Start of text */ | |
195 | extern char *start_of_data (); /* Start of initialized data */ | |
196 | ||
197 | #ifdef COFF | |
198 | static long block_copy_start; /* Old executable start point */ | |
199 | static struct filehdr f_hdr; /* File header */ | |
200 | static struct aouthdr f_ohdr; /* Optional file header (a.out) */ | |
201 | long bias; /* Bias to add for growth */ | |
202 | long lnnoptr; /* Pointer to line-number info within file */ | |
203 | #define SYMS_START block_copy_start | |
204 | ||
205 | static long text_scnptr; | |
206 | static long data_scnptr; | |
207 | ||
208 | #else /* not COFF */ | |
209 | ||
83cb209c JB |
210 | #ifdef HPUX |
211 | extern void *sbrk (); | |
212 | #else | |
f31fe472 RM |
213 | #if 0 |
214 | /* Some systems with __STDC__ compilers still declare this `char *' in some | |
215 | header file, and our declaration conflicts. The return value is always | |
216 | cast, so it should be harmless to leave it undefined. Hopefully | |
217 | machines with different size pointers and ints declare sbrk in a header | |
218 | file. */ | |
d4327fec JB |
219 | #ifdef __STDC__ |
220 | extern void *sbrk (); | |
221 | #else | |
7dd63af1 | 222 | extern char *sbrk (); |
83cb209c | 223 | #endif /* __STDC__ */ |
f31fe472 | 224 | #endif |
83cb209c | 225 | #endif /* HPUX */ |
7dd63af1 RS |
226 | |
227 | #define SYMS_START ((long) N_SYMOFF (ohdr)) | |
228 | ||
229 | /* Some machines override the structure name for an a.out header. */ | |
230 | #ifndef EXEC_HDR_TYPE | |
231 | #define EXEC_HDR_TYPE struct exec | |
232 | #endif | |
233 | ||
234 | #ifdef HPUX | |
235 | #ifdef HP9000S200_ID | |
236 | #define MY_ID HP9000S200_ID | |
237 | #else | |
238 | #include <model.h> | |
239 | #define MY_ID MYSYS | |
240 | #endif /* no HP9000S200_ID */ | |
241 | static MAGIC OLDMAGIC = {MY_ID, SHARE_MAGIC}; | |
242 | static MAGIC NEWMAGIC = {MY_ID, DEMAND_MAGIC}; | |
243 | #define N_TXTOFF(x) TEXT_OFFSET(x) | |
244 | #define N_SYMOFF(x) LESYM_OFFSET(x) | |
245 | static EXEC_HDR_TYPE hdr, ohdr; | |
246 | ||
247 | #else /* not HPUX */ | |
248 | ||
161aa2f8 | 249 | #if defined (USG) && !defined (IBMAIX) && !defined (IRIS) && !defined (COFF_ENCAPSULATE) && !defined (LINUX) |
7dd63af1 RS |
250 | static struct bhdr hdr, ohdr; |
251 | #define a_magic fmagic | |
252 | #define a_text tsize | |
253 | #define a_data dsize | |
254 | #define a_bss bsize | |
255 | #define a_syms ssize | |
256 | #define a_trsize rtsize | |
257 | #define a_drsize rdsize | |
258 | #define a_entry entry | |
259 | #define N_BADMAG(x) \ | |
260 | (((x).fmagic)!=OMAGIC && ((x).fmagic)!=NMAGIC &&\ | |
261 | ((x).fmagic)!=FMAGIC && ((x).fmagic)!=IMAGIC) | |
262 | #define NEWMAGIC FMAGIC | |
263 | #else /* IRIS or IBMAIX or not USG */ | |
264 | static EXEC_HDR_TYPE hdr, ohdr; | |
265 | #define NEWMAGIC ZMAGIC | |
266 | #endif /* IRIS or IBMAIX not USG */ | |
267 | #endif /* not HPUX */ | |
268 | ||
269 | static int unexec_text_start; | |
270 | static int unexec_data_start; | |
271 | ||
265a9e55 JB |
272 | #ifdef COFF_ENCAPSULATE |
273 | /* coffheader is defined in the GNU a.out.encap.h file. */ | |
274 | struct coffheader coffheader; | |
275 | #endif | |
276 | ||
7dd63af1 RS |
277 | #endif /* not COFF */ |
278 | ||
279 | static int pagemask; | |
280 | ||
281 | /* Correct an int which is the bit pattern of a pointer to a byte | |
282 | into an int which is the number of a byte. | |
283 | This is a no-op on ordinary machines, but not on all. */ | |
284 | ||
285 | #ifndef ADDR_CORRECT /* Let m-*.h files override this definition */ | |
286 | #define ADDR_CORRECT(x) ((char *)(x) - (char*)0) | |
287 | #endif | |
288 | ||
289 | #ifdef emacs | |
290 | ||
291 | static | |
292 | report_error (file, fd) | |
293 | char *file; | |
294 | int fd; | |
295 | { | |
296 | if (fd) | |
297 | close (fd); | |
298 | error ("Failure operating on %s\n", file); | |
299 | } | |
300 | #endif /* emacs */ | |
301 | ||
302 | #define ERROR0(msg) report_error_1 (new, msg, 0, 0); return -1 | |
303 | #define ERROR1(msg,x) report_error_1 (new, msg, x, 0); return -1 | |
304 | #define ERROR2(msg,x,y) report_error_1 (new, msg, x, y); return -1 | |
305 | ||
306 | static | |
307 | report_error_1 (fd, msg, a1, a2) | |
308 | int fd; | |
309 | char *msg; | |
310 | int a1, a2; | |
311 | { | |
312 | close (fd); | |
313 | #ifdef emacs | |
314 | error (msg, a1, a2); | |
315 | #else | |
316 | fprintf (stderr, msg, a1, a2); | |
317 | fprintf (stderr, "\n"); | |
318 | #endif | |
319 | } | |
320 | \f | |
321 | static int make_hdr (); | |
322 | static int copy_text_and_data (); | |
323 | static int copy_sym (); | |
324 | static void mark_x (); | |
325 | ||
326 | /* **************************************************************** | |
327 | * unexec | |
328 | * | |
329 | * driving logic. | |
330 | */ | |
331 | unexec (new_name, a_name, data_start, bss_start, entry_address) | |
332 | char *new_name, *a_name; | |
333 | unsigned data_start, bss_start, entry_address; | |
334 | { | |
335 | int new, a_out = -1; | |
336 | ||
337 | if (a_name && (a_out = open (a_name, 0)) < 0) | |
338 | { | |
339 | PERROR (a_name); | |
340 | } | |
341 | if ((new = creat (new_name, 0666)) < 0) | |
342 | { | |
343 | PERROR (new_name); | |
344 | } | |
345 | ||
346 | if (make_hdr (new, a_out, data_start, bss_start, entry_address, a_name, new_name) < 0 | |
347 | || copy_text_and_data (new, a_out) < 0 | |
348 | || copy_sym (new, a_out, a_name, new_name) < 0 | |
349 | #ifdef COFF | |
350 | #ifndef COFF_BSD_SYMBOLS | |
351 | || adjust_lnnoptrs (new, a_out, new_name) < 0 | |
352 | #endif | |
353 | #endif | |
354 | ) | |
355 | { | |
356 | close (new); | |
357 | /* unlink (new_name); /* Failed, unlink new a.out */ | |
358 | return -1; | |
359 | } | |
360 | ||
361 | close (new); | |
362 | if (a_out >= 0) | |
363 | close (a_out); | |
364 | mark_x (new_name); | |
365 | return 0; | |
366 | } | |
367 | ||
368 | /* **************************************************************** | |
369 | * make_hdr | |
370 | * | |
371 | * Make the header in the new a.out from the header in core. | |
372 | * Modify the text and data sizes. | |
373 | */ | |
374 | static int | |
375 | make_hdr (new, a_out, data_start, bss_start, entry_address, a_name, new_name) | |
376 | int new, a_out; | |
377 | unsigned data_start, bss_start, entry_address; | |
378 | char *a_name; | |
379 | char *new_name; | |
380 | { | |
381 | int tem; | |
382 | #ifdef COFF | |
383 | auto struct scnhdr f_thdr; /* Text section header */ | |
384 | auto struct scnhdr f_dhdr; /* Data section header */ | |
385 | auto struct scnhdr f_bhdr; /* Bss section header */ | |
386 | auto struct scnhdr scntemp; /* Temporary section header */ | |
387 | register int scns; | |
388 | #endif /* COFF */ | |
389 | #ifdef USG_SHARED_LIBRARIES | |
390 | extern unsigned int bss_end; | |
391 | #else | |
392 | unsigned int bss_end; | |
393 | #endif | |
394 | ||
395 | pagemask = getpagesize () - 1; | |
396 | ||
397 | /* Adjust text/data boundary. */ | |
398 | #ifdef NO_REMAP | |
399 | data_start = (int) start_of_data (); | |
400 | #else /* not NO_REMAP */ | |
401 | if (!data_start) | |
402 | data_start = (int) start_of_data (); | |
403 | #endif /* not NO_REMAP */ | |
404 | data_start = ADDR_CORRECT (data_start); | |
405 | ||
406 | #ifdef SEGMENT_MASK | |
407 | data_start = data_start & ~SEGMENT_MASK; /* (Down) to segment boundary. */ | |
408 | #else | |
409 | data_start = data_start & ~pagemask; /* (Down) to page boundary. */ | |
410 | #endif | |
411 | ||
412 | bss_end = ADDR_CORRECT (sbrk (0)) + pagemask; | |
413 | bss_end &= ~ pagemask; | |
414 | ||
415 | /* Adjust data/bss boundary. */ | |
416 | if (bss_start != 0) | |
417 | { | |
418 | bss_start = (ADDR_CORRECT (bss_start) + pagemask); | |
419 | /* (Up) to page bdry. */ | |
420 | bss_start &= ~ pagemask; | |
421 | if (bss_start > bss_end) | |
422 | { | |
423 | ERROR1 ("unexec: Specified bss_start (%u) is past end of program", | |
424 | bss_start); | |
425 | } | |
426 | } | |
427 | else | |
428 | bss_start = bss_end; | |
429 | ||
430 | if (data_start > bss_start) /* Can't have negative data size. */ | |
431 | { | |
432 | ERROR2 ("unexec: data_start (%u) can't be greater than bss_start (%u)", | |
433 | data_start, bss_start); | |
434 | } | |
435 | ||
436 | #ifdef COFF | |
437 | /* Salvage as much info from the existing file as possible */ | |
438 | if (a_out >= 0) | |
439 | { | |
440 | if (read (a_out, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) | |
441 | { | |
442 | PERROR (a_name); | |
443 | } | |
444 | block_copy_start += sizeof (f_hdr); | |
445 | if (f_hdr.f_opthdr > 0) | |
446 | { | |
447 | if (read (a_out, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) | |
448 | { | |
449 | PERROR (a_name); | |
450 | } | |
451 | block_copy_start += sizeof (f_ohdr); | |
452 | } | |
453 | /* Loop through section headers, copying them in */ | |
454 | for (scns = f_hdr.f_nscns; scns > 0; scns--) { | |
455 | if (read (a_out, &scntemp, sizeof (scntemp)) != sizeof (scntemp)) | |
456 | { | |
457 | PERROR (a_name); | |
458 | } | |
459 | if (scntemp.s_scnptr > 0L) | |
460 | { | |
461 | if (block_copy_start < scntemp.s_scnptr + scntemp.s_size) | |
462 | block_copy_start = scntemp.s_scnptr + scntemp.s_size; | |
463 | } | |
464 | if (strcmp (scntemp.s_name, ".text") == 0) | |
465 | { | |
466 | f_thdr = scntemp; | |
467 | } | |
468 | else if (strcmp (scntemp.s_name, ".data") == 0) | |
469 | { | |
470 | f_dhdr = scntemp; | |
471 | } | |
472 | else if (strcmp (scntemp.s_name, ".bss") == 0) | |
473 | { | |
474 | f_bhdr = scntemp; | |
475 | } | |
476 | } | |
477 | } | |
478 | else | |
479 | { | |
480 | ERROR0 ("can't build a COFF file from scratch yet"); | |
481 | } | |
482 | ||
483 | /* Now we alter the contents of all the f_*hdr variables | |
484 | to correspond to what we want to dump. */ | |
485 | ||
486 | #ifdef USG_SHARED_LIBRARIES | |
487 | ||
488 | /* The amount of data we're adding to the file is distance from the | |
489 | * end of the original .data space to the current end of the .data | |
490 | * space. | |
491 | */ | |
492 | ||
1ba3de00 | 493 | bias = bss_start - (f_ohdr.data_start + f_dhdr.s_size); |
7dd63af1 RS |
494 | |
495 | #endif | |
496 | ||
497 | f_hdr.f_flags |= (F_RELFLG | F_EXEC); | |
498 | #ifdef TPIX | |
499 | f_hdr.f_nscns = 3; | |
500 | #endif | |
501 | #ifdef EXEC_MAGIC | |
502 | f_ohdr.magic = EXEC_MAGIC; | |
503 | #endif | |
504 | #ifndef NO_REMAP | |
505 | f_ohdr.text_start = (long) start_of_text (); | |
506 | f_ohdr.tsize = data_start - f_ohdr.text_start; | |
507 | f_ohdr.data_start = data_start; | |
508 | #endif /* NO_REMAP */ | |
509 | f_ohdr.dsize = bss_start - f_ohdr.data_start; | |
510 | f_ohdr.bsize = bss_end - bss_start; | |
511 | #ifndef KEEP_OLD_TEXT_SCNPTR | |
512 | /* On some machines, the old values are right. | |
513 | ??? Maybe on all machines with NO_REMAP. */ | |
514 | f_thdr.s_size = f_ohdr.tsize; | |
515 | f_thdr.s_scnptr = sizeof (f_hdr) + sizeof (f_ohdr); | |
516 | f_thdr.s_scnptr += (f_hdr.f_nscns) * (sizeof (f_thdr)); | |
517 | #endif /* KEEP_OLD_TEXT_SCNPTR */ | |
518 | #ifdef ADJUST_TEXT_SCNHDR_SIZE | |
519 | /* On some machines, `text size' includes all headers. */ | |
520 | f_thdr.s_size -= f_thdr.s_scnptr; | |
521 | #endif /* ADJUST_TEST_SCNHDR_SIZE */ | |
522 | lnnoptr = f_thdr.s_lnnoptr; | |
523 | #ifdef SECTION_ALIGNMENT | |
524 | /* Some systems require special alignment | |
525 | of the sections in the file itself. */ | |
526 | f_thdr.s_scnptr | |
527 | = (f_thdr.s_scnptr + SECTION_ALIGNMENT) & ~SECTION_ALIGNMENT; | |
528 | #endif /* SECTION_ALIGNMENT */ | |
529 | #ifdef TPIX | |
530 | f_thdr.s_scnptr = 0xd0; | |
531 | #endif | |
532 | text_scnptr = f_thdr.s_scnptr; | |
533 | #ifdef ADJUST_TEXTBASE | |
534 | text_scnptr = sizeof (f_hdr) + sizeof (f_ohdr) + (f_hdr.f_nscns) * (sizeof (f_thdr)); | |
535 | #endif | |
536 | #ifndef KEEP_OLD_PADDR | |
537 | f_dhdr.s_paddr = f_ohdr.data_start; | |
538 | #endif /* KEEP_OLD_PADDR */ | |
539 | f_dhdr.s_vaddr = f_ohdr.data_start; | |
540 | f_dhdr.s_size = f_ohdr.dsize; | |
541 | f_dhdr.s_scnptr = f_thdr.s_scnptr + f_thdr.s_size; | |
542 | #ifdef SECTION_ALIGNMENT | |
543 | /* Some systems require special alignment | |
544 | of the sections in the file itself. */ | |
545 | f_dhdr.s_scnptr | |
546 | = (f_dhdr.s_scnptr + SECTION_ALIGNMENT) & ~SECTION_ALIGNMENT; | |
547 | #endif /* SECTION_ALIGNMENT */ | |
548 | #ifdef DATA_SECTION_ALIGNMENT | |
549 | /* Some systems require special alignment | |
550 | of the data section only. */ | |
551 | f_dhdr.s_scnptr | |
552 | = (f_dhdr.s_scnptr + DATA_SECTION_ALIGNMENT) & ~DATA_SECTION_ALIGNMENT; | |
553 | #endif /* DATA_SECTION_ALIGNMENT */ | |
554 | data_scnptr = f_dhdr.s_scnptr; | |
555 | #ifndef KEEP_OLD_PADDR | |
556 | f_bhdr.s_paddr = f_ohdr.data_start + f_ohdr.dsize; | |
557 | #endif /* KEEP_OLD_PADDR */ | |
558 | f_bhdr.s_vaddr = f_ohdr.data_start + f_ohdr.dsize; | |
559 | f_bhdr.s_size = f_ohdr.bsize; | |
560 | f_bhdr.s_scnptr = 0L; | |
561 | #ifndef USG_SHARED_LIBRARIES | |
562 | bias = f_dhdr.s_scnptr + f_dhdr.s_size - block_copy_start; | |
563 | #endif | |
564 | ||
565 | if (f_hdr.f_symptr > 0L) | |
566 | { | |
567 | f_hdr.f_symptr += bias; | |
568 | } | |
569 | ||
570 | if (f_thdr.s_lnnoptr > 0L) | |
571 | { | |
572 | f_thdr.s_lnnoptr += bias; | |
573 | } | |
574 | ||
575 | #ifdef ADJUST_EXEC_HEADER | |
576 | ADJUST_EXEC_HEADER; | |
577 | #endif /* ADJUST_EXEC_HEADER */ | |
578 | ||
579 | if (write (new, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) | |
580 | { | |
581 | PERROR (new_name); | |
582 | } | |
583 | ||
584 | if (write (new, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) | |
585 | { | |
586 | PERROR (new_name); | |
587 | } | |
588 | ||
589 | #ifndef USG_SHARED_LIBRARIES | |
590 | ||
591 | if (write (new, &f_thdr, sizeof (f_thdr)) != sizeof (f_thdr)) | |
592 | { | |
593 | PERROR (new_name); | |
594 | } | |
595 | ||
596 | if (write (new, &f_dhdr, sizeof (f_dhdr)) != sizeof (f_dhdr)) | |
597 | { | |
598 | PERROR (new_name); | |
599 | } | |
600 | ||
601 | if (write (new, &f_bhdr, sizeof (f_bhdr)) != sizeof (f_bhdr)) | |
602 | { | |
603 | PERROR (new_name); | |
604 | } | |
605 | ||
606 | #else /* USG_SHARED_LIBRARIES */ | |
607 | ||
608 | /* The purpose of this code is to write out the new file's section | |
609 | * header table. | |
610 | * | |
611 | * Scan through the original file's sections. If the encountered | |
612 | * section is one we know (.text, .data or .bss), write out the | |
613 | * correct header. If it is a section we do not know (such as | |
614 | * .lib), adjust the address of where the section data is in the | |
615 | * file, and write out the header. | |
616 | * | |
eb8c3be9 | 617 | * If any section precedes .text or .data in the file, this code |
7dd63af1 RS |
618 | * will not adjust the file pointer for that section correctly. |
619 | */ | |
620 | ||
621 | lseek (a_out, sizeof (f_hdr) + sizeof (f_ohdr), 0); | |
622 | ||
623 | for (scns = f_hdr.f_nscns; scns > 0; scns--) | |
624 | { | |
625 | if (read (a_out, &scntemp, sizeof (scntemp)) != sizeof (scntemp)) | |
626 | PERROR (a_name); | |
627 | ||
628 | if (!strcmp (scntemp.s_name, f_thdr.s_name)) /* .text */ | |
629 | { | |
630 | if (write (new, &f_thdr, sizeof (f_thdr)) != sizeof (f_thdr)) | |
631 | PERROR (new_name); | |
632 | } | |
633 | else if (!strcmp (scntemp.s_name, f_dhdr.s_name)) /* .data */ | |
634 | { | |
635 | if (write (new, &f_dhdr, sizeof (f_dhdr)) != sizeof (f_dhdr)) | |
636 | PERROR (new_name); | |
637 | } | |
638 | else if (!strcmp (scntemp.s_name, f_bhdr.s_name)) /* .bss */ | |
639 | { | |
640 | if (write (new, &f_bhdr, sizeof (f_bhdr)) != sizeof (f_bhdr)) | |
641 | PERROR (new_name); | |
642 | } | |
643 | else | |
644 | { | |
645 | if (scntemp.s_scnptr) | |
646 | scntemp.s_scnptr += bias; | |
647 | if (write (new, &scntemp, sizeof (scntemp)) != sizeof (scntemp)) | |
648 | PERROR (new_name); | |
649 | } | |
650 | } | |
651 | #endif /* USG_SHARED_LIBRARIES */ | |
652 | ||
653 | return (0); | |
654 | ||
655 | #else /* if not COFF */ | |
656 | ||
657 | /* Get symbol table info from header of a.out file if given one. */ | |
658 | if (a_out >= 0) | |
659 | { | |
265a9e55 JB |
660 | #ifdef COFF_ENCAPSULATE |
661 | if (read (a_out, &coffheader, sizeof coffheader) != sizeof coffheader) | |
662 | { | |
663 | PERROR(a_name); | |
664 | } | |
665 | if (coffheader.f_magic != COFF_MAGIC) | |
666 | { | |
667 | ERROR1("%s doesn't have legal coff magic number\n", a_name); | |
668 | } | |
669 | #endif | |
7dd63af1 RS |
670 | if (read (a_out, &ohdr, sizeof hdr) != sizeof hdr) |
671 | { | |
672 | PERROR (a_name); | |
673 | } | |
674 | ||
675 | if (N_BADMAG (ohdr)) | |
676 | { | |
677 | ERROR1 ("invalid magic number in %s", a_name); | |
678 | } | |
679 | hdr = ohdr; | |
680 | } | |
681 | else | |
682 | { | |
265a9e55 JB |
683 | #ifdef COFF_ENCAPSULATE |
684 | /* We probably could without too much trouble. The code is in gld | |
685 | * but I don't have that much time or incentive. | |
686 | */ | |
687 | ERROR0 ("can't build a COFF file from scratch yet"); | |
688 | #else | |
a5fd213f | 689 | bzero (&hdr, sizeof hdr); |
265a9e55 | 690 | #endif |
7dd63af1 RS |
691 | } |
692 | ||
693 | unexec_text_start = (long) start_of_text (); | |
694 | unexec_data_start = data_start; | |
695 | ||
696 | /* Machine-dependent fixup for header, or maybe for unexec_text_start */ | |
697 | #ifdef ADJUST_EXEC_HEADER | |
698 | ADJUST_EXEC_HEADER; | |
699 | #endif /* ADJUST_EXEC_HEADER */ | |
700 | ||
701 | hdr.a_trsize = 0; | |
702 | hdr.a_drsize = 0; | |
703 | if (entry_address != 0) | |
704 | hdr.a_entry = entry_address; | |
705 | ||
706 | hdr.a_bss = bss_end - bss_start; | |
707 | hdr.a_data = bss_start - data_start; | |
708 | #ifdef NO_REMAP | |
709 | hdr.a_text = ohdr.a_text; | |
710 | #else /* not NO_REMAP */ | |
711 | hdr.a_text = data_start - unexec_text_start; | |
712 | ||
713 | #ifdef A_TEXT_OFFSET | |
714 | hdr.a_text += A_TEXT_OFFSET (ohdr); | |
715 | #endif | |
716 | ||
717 | #endif /* not NO_REMAP */ | |
718 | ||
265a9e55 JB |
719 | #ifdef COFF_ENCAPSULATE |
720 | /* We are encapsulating BSD format within COFF format. */ | |
721 | { | |
722 | struct coffscn *tp, *dp, *bp; | |
723 | tp = &coffheader.scns[0]; | |
724 | dp = &coffheader.scns[1]; | |
725 | bp = &coffheader.scns[2]; | |
726 | tp->s_size = hdr.a_text + sizeof(struct exec); | |
727 | dp->s_paddr = data_start; | |
728 | dp->s_vaddr = data_start; | |
729 | dp->s_size = hdr.a_data; | |
730 | bp->s_paddr = dp->s_vaddr + dp->s_size; | |
731 | bp->s_vaddr = bp->s_paddr; | |
732 | bp->s_size = hdr.a_bss; | |
733 | coffheader.tsize = tp->s_size; | |
734 | coffheader.dsize = dp->s_size; | |
735 | coffheader.bsize = bp->s_size; | |
736 | coffheader.text_start = tp->s_vaddr; | |
737 | coffheader.data_start = dp->s_vaddr; | |
738 | } | |
739 | if (write (new, &coffheader, sizeof coffheader) != sizeof coffheader) | |
740 | { | |
741 | PERROR(new_name); | |
742 | } | |
743 | #endif /* COFF_ENCAPSULATE */ | |
744 | ||
7dd63af1 RS |
745 | if (write (new, &hdr, sizeof hdr) != sizeof hdr) |
746 | { | |
747 | PERROR (new_name); | |
748 | } | |
749 | ||
750 | #ifdef A_TEXT_OFFSET | |
751 | hdr.a_text -= A_TEXT_OFFSET (ohdr); | |
752 | #endif | |
753 | ||
754 | return 0; | |
755 | ||
756 | #endif /* not COFF */ | |
757 | } | |
758 | \f | |
759 | /* **************************************************************** | |
760 | * copy_text_and_data | |
761 | * | |
762 | * Copy the text and data segments from memory to the new a.out | |
763 | */ | |
764 | static int | |
765 | copy_text_and_data (new, a_out) | |
766 | int new, a_out; | |
767 | { | |
768 | register char *end; | |
769 | register char *ptr; | |
770 | ||
771 | #ifdef COFF | |
772 | ||
773 | #ifdef USG_SHARED_LIBRARIES | |
774 | ||
775 | int scns; | |
776 | struct scnhdr scntemp; /* Temporary section header */ | |
777 | ||
778 | /* The purpose of this code is to write out the new file's section | |
779 | * contents. | |
780 | * | |
781 | * Step through the section table. If we know the section (.text, | |
782 | * .data) do the appropriate thing. Otherwise, if the section has | |
783 | * no allocated space in the file (.bss), do nothing. Otherwise, | |
784 | * the section has space allocated in the file, and is not a section | |
785 | * we know. So just copy it. | |
786 | */ | |
787 | ||
788 | lseek (a_out, sizeof (struct filehdr) + sizeof (struct aouthdr), 0); | |
789 | ||
790 | for (scns = f_hdr.f_nscns; scns > 0; scns--) | |
791 | { | |
792 | if (read (a_out, &scntemp, sizeof (scntemp)) != sizeof (scntemp)) | |
793 | PERROR ("temacs"); | |
794 | ||
795 | if (!strcmp (scntemp.s_name, ".text")) | |
796 | { | |
797 | lseek (new, (long) text_scnptr, 0); | |
798 | ptr = (char *) f_ohdr.text_start; | |
799 | end = ptr + f_ohdr.tsize; | |
800 | write_segment (new, ptr, end); | |
801 | } | |
802 | else if (!strcmp (scntemp.s_name, ".data")) | |
803 | { | |
804 | lseek (new, (long) data_scnptr, 0); | |
805 | ptr = (char *) f_ohdr.data_start; | |
806 | end = ptr + f_ohdr.dsize; | |
807 | write_segment (new, ptr, end); | |
808 | } | |
809 | else if (!scntemp.s_scnptr) | |
810 | ; /* do nothing - no data for this section */ | |
811 | else | |
812 | { | |
813 | char page[BUFSIZ]; | |
814 | int size, n; | |
815 | long old_a_out_ptr = lseek (a_out, 0, 1); | |
816 | ||
817 | lseek (a_out, scntemp.s_scnptr, 0); | |
818 | for (size = scntemp.s_size; size > 0; size -= sizeof (page)) | |
819 | { | |
820 | n = size > sizeof (page) ? sizeof (page) : size; | |
821 | if (read (a_out, page, n) != n || write (new, page, n) != n) | |
8116bbb0 | 822 | PERROR ("emacs"); |
7dd63af1 RS |
823 | } |
824 | lseek (a_out, old_a_out_ptr, 0); | |
825 | } | |
826 | } | |
827 | ||
828 | #else /* COFF, but not USG_SHARED_LIBRARIES */ | |
829 | ||
830 | lseek (new, (long) text_scnptr, 0); | |
831 | ptr = (char *) f_ohdr.text_start; | |
832 | #ifdef HEADER_INCL_IN_TEXT | |
833 | /* For Gould UTX/32, text starts after headers */ | |
834 | ptr = (char *) (ptr + text_scnptr); | |
835 | #endif /* HEADER_INCL_IN_TEXT */ | |
836 | end = ptr + f_ohdr.tsize; | |
837 | write_segment (new, ptr, end); | |
838 | ||
839 | lseek (new, (long) data_scnptr, 0); | |
840 | ptr = (char *) f_ohdr.data_start; | |
841 | end = ptr + f_ohdr.dsize; | |
842 | write_segment (new, ptr, end); | |
843 | ||
844 | #endif /* USG_SHARED_LIBRARIES */ | |
845 | ||
846 | #else /* if not COFF */ | |
847 | ||
848 | /* Some machines count the header as part of the text segment. | |
849 | That is to say, the header appears in core | |
850 | just before the address that start_of_text () returns. | |
851 | For them, N_TXTOFF is the place where the header goes. | |
852 | We must adjust the seek to the place after the header. | |
853 | Note that at this point hdr.a_text does *not* count | |
854 | the extra A_TEXT_OFFSET bytes, only the actual bytes of code. */ | |
855 | ||
856 | #ifdef A_TEXT_SEEK | |
857 | lseek (new, (long) A_TEXT_SEEK (hdr), 0); | |
858 | #else | |
859 | lseek (new, (long) N_TXTOFF (hdr), 0); | |
860 | #endif /* no A_TEXT_SEEK */ | |
861 | ||
862 | ptr = (char *) unexec_text_start; | |
863 | end = ptr + hdr.a_text; | |
864 | write_segment (new, ptr, end); | |
865 | ||
866 | ptr = (char *) unexec_data_start; | |
867 | end = ptr + hdr.a_data; | |
868 | /* This lseek is certainly incorrect when A_TEXT_OFFSET | |
869 | and I believe it is a no-op otherwise. | |
870 | Let's see if its absence ever fails. */ | |
871 | /* lseek (new, (long) N_TXTOFF (hdr) + hdr.a_text, 0); */ | |
872 | write_segment (new, ptr, end); | |
873 | ||
874 | #endif /* not COFF */ | |
875 | ||
876 | return 0; | |
877 | } | |
878 | ||
879 | write_segment (new, ptr, end) | |
880 | int new; | |
881 | register char *ptr, *end; | |
882 | { | |
883 | register int i, nwrite, ret; | |
884 | char buf[80]; | |
885 | extern int errno; | |
886 | char zeros[128]; | |
887 | ||
888 | bzero (zeros, sizeof zeros); | |
889 | ||
890 | for (i = 0; ptr < end;) | |
891 | { | |
892 | /* distance to next multiple of 128. */ | |
893 | nwrite = (((int) ptr + 128) & -128) - (int) ptr; | |
894 | /* But not beyond specified end. */ | |
895 | if (nwrite > end - ptr) nwrite = end - ptr; | |
896 | ret = write (new, ptr, nwrite); | |
897 | /* If write gets a page fault, it means we reached | |
898 | a gap between the old text segment and the old data segment. | |
899 | This gap has probably been remapped into part of the text segment. | |
900 | So write zeros for it. */ | |
901 | if (ret == -1 && errno == EFAULT) | |
902 | write (new, zeros, nwrite); | |
903 | else if (nwrite != ret) | |
904 | { | |
905 | sprintf (buf, | |
906 | "unexec write failure: addr 0x%x, fileno %d, size 0x%x, wrote 0x%x, errno %d", | |
907 | ptr, new, nwrite, ret, errno); | |
908 | PERROR (buf); | |
909 | } | |
910 | i += nwrite; | |
911 | ptr += nwrite; | |
912 | } | |
913 | } | |
914 | \f | |
915 | /* **************************************************************** | |
916 | * copy_sym | |
917 | * | |
918 | * Copy the relocation information and symbol table from the a.out to the new | |
919 | */ | |
920 | static int | |
921 | copy_sym (new, a_out, a_name, new_name) | |
922 | int new, a_out; | |
923 | char *a_name, *new_name; | |
924 | { | |
925 | char page[1024]; | |
926 | int n; | |
927 | ||
928 | if (a_out < 0) | |
929 | return 0; | |
930 | ||
931 | #ifdef COFF | |
932 | if (SYMS_START == 0L) | |
933 | return 0; | |
934 | #endif /* COFF */ | |
935 | ||
936 | #ifdef COFF | |
937 | if (lnnoptr) /* if there is line number info */ | |
938 | lseek (a_out, lnnoptr, 0); /* start copying from there */ | |
939 | else | |
940 | #endif /* COFF */ | |
941 | lseek (a_out, SYMS_START, 0); /* Position a.out to symtab. */ | |
942 | ||
943 | while ((n = read (a_out, page, sizeof page)) > 0) | |
944 | { | |
945 | if (write (new, page, n) != n) | |
946 | { | |
947 | PERROR (new_name); | |
948 | } | |
949 | } | |
950 | if (n < 0) | |
951 | { | |
952 | PERROR (a_name); | |
953 | } | |
954 | return 0; | |
955 | } | |
956 | \f | |
957 | /* **************************************************************** | |
958 | * mark_x | |
959 | * | |
eb8c3be9 | 960 | * After successfully building the new a.out, mark it executable |
7dd63af1 RS |
961 | */ |
962 | static void | |
963 | mark_x (name) | |
964 | char *name; | |
965 | { | |
966 | struct stat sbuf; | |
967 | int um; | |
968 | int new = 0; /* for PERROR */ | |
969 | ||
970 | um = umask (777); | |
971 | umask (um); | |
972 | if (stat (name, &sbuf) == -1) | |
973 | { | |
974 | PERROR (name); | |
975 | } | |
976 | sbuf.st_mode |= 0111 & ~um; | |
977 | if (chmod (name, sbuf.st_mode) == -1) | |
978 | PERROR (name); | |
979 | } | |
980 | \f | |
981 | #ifdef COFF | |
982 | #ifndef COFF_BSD_SYMBOLS | |
983 | ||
984 | /* | |
985 | * If the COFF file contains a symbol table and a line number section, | |
986 | * then any auxiliary entries that have values for x_lnnoptr must | |
987 | * be adjusted by the amount that the line number section has moved | |
988 | * in the file (bias computed in make_hdr). The #@$%&* designers of | |
989 | * the auxiliary entry structures used the absolute file offsets for | |
990 | * the line number entry rather than an offset from the start of the | |
991 | * line number section! | |
992 | * | |
993 | * When I figure out how to scan through the symbol table and pick out | |
994 | * the auxiliary entries that need adjustment, this routine will | |
995 | * be fixed. As it is now, all such entries are wrong and sdb | |
996 | * will complain. Fred Fish, UniSoft Systems Inc. | |
997 | */ | |
998 | ||
999 | /* This function is probably very slow. Instead of reopening the new | |
1000 | file for input and output it should copy from the old to the new | |
1001 | using the two descriptors already open (WRITEDESC and READDESC). | |
1002 | Instead of reading one small structure at a time it should use | |
1003 | a reasonable size buffer. But I don't have time to work on such | |
1004 | things, so I am installing it as submitted to me. -- RMS. */ | |
1005 | ||
1006 | adjust_lnnoptrs (writedesc, readdesc, new_name) | |
1007 | int writedesc; | |
1008 | int readdesc; | |
1009 | char *new_name; | |
1010 | { | |
1011 | register int nsyms; | |
1012 | register int new; | |
91bac16a | 1013 | #if defined (amdahl_uts) || defined (pfa) |
7dd63af1 RS |
1014 | SYMENT symentry; |
1015 | AUXENT auxentry; | |
1016 | #else | |
1017 | struct syment symentry; | |
1018 | union auxent auxentry; | |
1019 | #endif | |
1020 | ||
1021 | if (!lnnoptr || !f_hdr.f_symptr) | |
1022 | return 0; | |
1023 | ||
1024 | if ((new = open (new_name, 2)) < 0) | |
1025 | { | |
1026 | PERROR (new_name); | |
1027 | return -1; | |
1028 | } | |
1029 | ||
1030 | lseek (new, f_hdr.f_symptr, 0); | |
1031 | for (nsyms = 0; nsyms < f_hdr.f_nsyms; nsyms++) | |
1032 | { | |
1033 | read (new, &symentry, SYMESZ); | |
1034 | if (symentry.n_numaux) | |
1035 | { | |
1036 | read (new, &auxentry, AUXESZ); | |
1037 | nsyms++; | |
1ba3de00 RS |
1038 | if (ISFCN (symentry.n_type) || symentry.n_type == 0x2400) |
1039 | { | |
1040 | auxentry.x_sym.x_fcnary.x_fcn.x_lnnoptr += bias; | |
1041 | lseek (new, -AUXESZ, 1); | |
1042 | write (new, &auxentry, AUXESZ); | |
1043 | } | |
7dd63af1 RS |
1044 | } |
1045 | } | |
1046 | close (new); | |
1047 | } | |
1048 | ||
1049 | #endif /* COFF_BSD_SYMBOLS */ | |
1050 | ||
1051 | #endif /* COFF */ | |
1052 | ||
1053 | #endif /* not CANNOT_UNEXEC */ | |
1054 | ||
1055 | #endif /* not CANNOT_DUMP */ |