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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 | |
3680bdc6 RS |
179 | #ifdef MSDOS |
180 | #include <../go32/gotypes.h> | |
181 | #include <../go32/ed/coff.h> | |
182 | #define filehdr external_filehdr | |
183 | #define scnhdr external_scnhdr | |
184 | #define syment external_syment | |
185 | #define auxent external_auxent | |
186 | #define n_numaux e_numaux | |
187 | #define n_type e_type | |
188 | struct aouthdr | |
189 | { | |
190 | word16 magic; /* type of file */ | |
191 | word16 vstamp; /* version stamp */ | |
192 | word32 tsize; /* text size in bytes, padded to FW bdry*/ | |
193 | word32 dsize; /* initialized data " " */ | |
194 | word32 bsize; /* uninitialized data " " */ | |
195 | word32 entry; /* entry pt. */ | |
196 | word32 text_start; /* base of text used for this file */ | |
197 | word32 data_start; /* base of data used for this file */ | |
198 | }; | |
199 | ||
200 | ||
201 | #else /* not MSDOS */ | |
7dd63af1 | 202 | #include <a.out.h> |
3680bdc6 | 203 | #endif /* not MSDOS */ |
265a9e55 JB |
204 | #endif |
205 | ||
7dd63af1 RS |
206 | /* Define getpagesize () if the system does not. |
207 | Note that this may depend on symbols defined in a.out.h | |
208 | */ | |
209 | #include "getpagesize.h" | |
210 | ||
211 | #ifndef makedev /* Try to detect types.h already loaded */ | |
212 | #include <sys/types.h> | |
265a9e55 | 213 | #endif /* makedev */ |
7dd63af1 RS |
214 | #include <stdio.h> |
215 | #include <sys/stat.h> | |
216 | #include <errno.h> | |
217 | ||
218 | extern char *start_of_text (); /* Start of text */ | |
219 | extern char *start_of_data (); /* Start of initialized data */ | |
220 | ||
221 | #ifdef COFF | |
222 | static long block_copy_start; /* Old executable start point */ | |
223 | static struct filehdr f_hdr; /* File header */ | |
224 | static struct aouthdr f_ohdr; /* Optional file header (a.out) */ | |
225 | long bias; /* Bias to add for growth */ | |
226 | long lnnoptr; /* Pointer to line-number info within file */ | |
227 | #define SYMS_START block_copy_start | |
228 | ||
229 | static long text_scnptr; | |
230 | static long data_scnptr; | |
231 | ||
232 | #else /* not COFF */ | |
233 | ||
83cb209c JB |
234 | #ifdef HPUX |
235 | extern void *sbrk (); | |
236 | #else | |
f31fe472 RM |
237 | #if 0 |
238 | /* Some systems with __STDC__ compilers still declare this `char *' in some | |
239 | header file, and our declaration conflicts. The return value is always | |
240 | cast, so it should be harmless to leave it undefined. Hopefully | |
241 | machines with different size pointers and ints declare sbrk in a header | |
242 | file. */ | |
d4327fec JB |
243 | #ifdef __STDC__ |
244 | extern void *sbrk (); | |
245 | #else | |
7dd63af1 | 246 | extern char *sbrk (); |
83cb209c | 247 | #endif /* __STDC__ */ |
f31fe472 | 248 | #endif |
83cb209c | 249 | #endif /* HPUX */ |
7dd63af1 RS |
250 | |
251 | #define SYMS_START ((long) N_SYMOFF (ohdr)) | |
252 | ||
253 | /* Some machines override the structure name for an a.out header. */ | |
254 | #ifndef EXEC_HDR_TYPE | |
255 | #define EXEC_HDR_TYPE struct exec | |
256 | #endif | |
257 | ||
258 | #ifdef HPUX | |
259 | #ifdef HP9000S200_ID | |
260 | #define MY_ID HP9000S200_ID | |
261 | #else | |
262 | #include <model.h> | |
263 | #define MY_ID MYSYS | |
264 | #endif /* no HP9000S200_ID */ | |
265 | static MAGIC OLDMAGIC = {MY_ID, SHARE_MAGIC}; | |
266 | static MAGIC NEWMAGIC = {MY_ID, DEMAND_MAGIC}; | |
267 | #define N_TXTOFF(x) TEXT_OFFSET(x) | |
268 | #define N_SYMOFF(x) LESYM_OFFSET(x) | |
269 | static EXEC_HDR_TYPE hdr, ohdr; | |
270 | ||
271 | #else /* not HPUX */ | |
272 | ||
161aa2f8 | 273 | #if defined (USG) && !defined (IBMAIX) && !defined (IRIS) && !defined (COFF_ENCAPSULATE) && !defined (LINUX) |
7dd63af1 RS |
274 | static struct bhdr hdr, ohdr; |
275 | #define a_magic fmagic | |
276 | #define a_text tsize | |
277 | #define a_data dsize | |
278 | #define a_bss bsize | |
279 | #define a_syms ssize | |
280 | #define a_trsize rtsize | |
281 | #define a_drsize rdsize | |
282 | #define a_entry entry | |
283 | #define N_BADMAG(x) \ | |
284 | (((x).fmagic)!=OMAGIC && ((x).fmagic)!=NMAGIC &&\ | |
285 | ((x).fmagic)!=FMAGIC && ((x).fmagic)!=IMAGIC) | |
286 | #define NEWMAGIC FMAGIC | |
287 | #else /* IRIS or IBMAIX or not USG */ | |
288 | static EXEC_HDR_TYPE hdr, ohdr; | |
289 | #define NEWMAGIC ZMAGIC | |
290 | #endif /* IRIS or IBMAIX not USG */ | |
291 | #endif /* not HPUX */ | |
292 | ||
293 | static int unexec_text_start; | |
294 | static int unexec_data_start; | |
295 | ||
265a9e55 JB |
296 | #ifdef COFF_ENCAPSULATE |
297 | /* coffheader is defined in the GNU a.out.encap.h file. */ | |
298 | struct coffheader coffheader; | |
299 | #endif | |
300 | ||
7dd63af1 RS |
301 | #endif /* not COFF */ |
302 | ||
303 | static int pagemask; | |
304 | ||
305 | /* Correct an int which is the bit pattern of a pointer to a byte | |
306 | into an int which is the number of a byte. | |
307 | This is a no-op on ordinary machines, but not on all. */ | |
308 | ||
309 | #ifndef ADDR_CORRECT /* Let m-*.h files override this definition */ | |
310 | #define ADDR_CORRECT(x) ((char *)(x) - (char*)0) | |
311 | #endif | |
312 | ||
313 | #ifdef emacs | |
314 | ||
315 | static | |
316 | report_error (file, fd) | |
317 | char *file; | |
318 | int fd; | |
319 | { | |
320 | if (fd) | |
321 | close (fd); | |
322 | error ("Failure operating on %s\n", file); | |
323 | } | |
324 | #endif /* emacs */ | |
325 | ||
326 | #define ERROR0(msg) report_error_1 (new, msg, 0, 0); return -1 | |
327 | #define ERROR1(msg,x) report_error_1 (new, msg, x, 0); return -1 | |
328 | #define ERROR2(msg,x,y) report_error_1 (new, msg, x, y); return -1 | |
329 | ||
330 | static | |
331 | report_error_1 (fd, msg, a1, a2) | |
332 | int fd; | |
333 | char *msg; | |
334 | int a1, a2; | |
335 | { | |
336 | close (fd); | |
337 | #ifdef emacs | |
338 | error (msg, a1, a2); | |
339 | #else | |
340 | fprintf (stderr, msg, a1, a2); | |
341 | fprintf (stderr, "\n"); | |
342 | #endif | |
343 | } | |
344 | \f | |
345 | static int make_hdr (); | |
346 | static int copy_text_and_data (); | |
347 | static int copy_sym (); | |
348 | static void mark_x (); | |
349 | ||
350 | /* **************************************************************** | |
351 | * unexec | |
352 | * | |
353 | * driving logic. | |
354 | */ | |
355 | unexec (new_name, a_name, data_start, bss_start, entry_address) | |
356 | char *new_name, *a_name; | |
357 | unsigned data_start, bss_start, entry_address; | |
358 | { | |
359 | int new, a_out = -1; | |
360 | ||
361 | if (a_name && (a_out = open (a_name, 0)) < 0) | |
362 | { | |
363 | PERROR (a_name); | |
364 | } | |
365 | if ((new = creat (new_name, 0666)) < 0) | |
366 | { | |
367 | PERROR (new_name); | |
368 | } | |
369 | ||
370 | if (make_hdr (new, a_out, data_start, bss_start, entry_address, a_name, new_name) < 0 | |
371 | || copy_text_and_data (new, a_out) < 0 | |
372 | || copy_sym (new, a_out, a_name, new_name) < 0 | |
373 | #ifdef COFF | |
374 | #ifndef COFF_BSD_SYMBOLS | |
375 | || adjust_lnnoptrs (new, a_out, new_name) < 0 | |
376 | #endif | |
377 | #endif | |
378 | ) | |
379 | { | |
380 | close (new); | |
381 | /* unlink (new_name); /* Failed, unlink new a.out */ | |
382 | return -1; | |
383 | } | |
384 | ||
385 | close (new); | |
386 | if (a_out >= 0) | |
387 | close (a_out); | |
388 | mark_x (new_name); | |
389 | return 0; | |
390 | } | |
391 | ||
392 | /* **************************************************************** | |
393 | * make_hdr | |
394 | * | |
395 | * Make the header in the new a.out from the header in core. | |
396 | * Modify the text and data sizes. | |
397 | */ | |
398 | static int | |
399 | make_hdr (new, a_out, data_start, bss_start, entry_address, a_name, new_name) | |
400 | int new, a_out; | |
401 | unsigned data_start, bss_start, entry_address; | |
402 | char *a_name; | |
403 | char *new_name; | |
404 | { | |
405 | int tem; | |
406 | #ifdef COFF | |
407 | auto struct scnhdr f_thdr; /* Text section header */ | |
408 | auto struct scnhdr f_dhdr; /* Data section header */ | |
409 | auto struct scnhdr f_bhdr; /* Bss section header */ | |
410 | auto struct scnhdr scntemp; /* Temporary section header */ | |
411 | register int scns; | |
412 | #endif /* COFF */ | |
413 | #ifdef USG_SHARED_LIBRARIES | |
414 | extern unsigned int bss_end; | |
415 | #else | |
416 | unsigned int bss_end; | |
417 | #endif | |
418 | ||
419 | pagemask = getpagesize () - 1; | |
420 | ||
421 | /* Adjust text/data boundary. */ | |
422 | #ifdef NO_REMAP | |
423 | data_start = (int) start_of_data (); | |
424 | #else /* not NO_REMAP */ | |
425 | if (!data_start) | |
426 | data_start = (int) start_of_data (); | |
427 | #endif /* not NO_REMAP */ | |
428 | data_start = ADDR_CORRECT (data_start); | |
429 | ||
430 | #ifdef SEGMENT_MASK | |
431 | data_start = data_start & ~SEGMENT_MASK; /* (Down) to segment boundary. */ | |
432 | #else | |
433 | data_start = data_start & ~pagemask; /* (Down) to page boundary. */ | |
434 | #endif | |
435 | ||
436 | bss_end = ADDR_CORRECT (sbrk (0)) + pagemask; | |
437 | bss_end &= ~ pagemask; | |
438 | ||
439 | /* Adjust data/bss boundary. */ | |
440 | if (bss_start != 0) | |
441 | { | |
442 | bss_start = (ADDR_CORRECT (bss_start) + pagemask); | |
443 | /* (Up) to page bdry. */ | |
444 | bss_start &= ~ pagemask; | |
445 | if (bss_start > bss_end) | |
446 | { | |
447 | ERROR1 ("unexec: Specified bss_start (%u) is past end of program", | |
448 | bss_start); | |
449 | } | |
450 | } | |
451 | else | |
452 | bss_start = bss_end; | |
453 | ||
454 | if (data_start > bss_start) /* Can't have negative data size. */ | |
455 | { | |
456 | ERROR2 ("unexec: data_start (%u) can't be greater than bss_start (%u)", | |
457 | data_start, bss_start); | |
458 | } | |
459 | ||
460 | #ifdef COFF | |
461 | /* Salvage as much info from the existing file as possible */ | |
462 | if (a_out >= 0) | |
463 | { | |
464 | if (read (a_out, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) | |
465 | { | |
466 | PERROR (a_name); | |
467 | } | |
468 | block_copy_start += sizeof (f_hdr); | |
469 | if (f_hdr.f_opthdr > 0) | |
470 | { | |
471 | if (read (a_out, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) | |
472 | { | |
473 | PERROR (a_name); | |
474 | } | |
475 | block_copy_start += sizeof (f_ohdr); | |
476 | } | |
477 | /* Loop through section headers, copying them in */ | |
478 | for (scns = f_hdr.f_nscns; scns > 0; scns--) { | |
479 | if (read (a_out, &scntemp, sizeof (scntemp)) != sizeof (scntemp)) | |
480 | { | |
481 | PERROR (a_name); | |
482 | } | |
483 | if (scntemp.s_scnptr > 0L) | |
484 | { | |
485 | if (block_copy_start < scntemp.s_scnptr + scntemp.s_size) | |
486 | block_copy_start = scntemp.s_scnptr + scntemp.s_size; | |
487 | } | |
488 | if (strcmp (scntemp.s_name, ".text") == 0) | |
489 | { | |
490 | f_thdr = scntemp; | |
491 | } | |
492 | else if (strcmp (scntemp.s_name, ".data") == 0) | |
493 | { | |
494 | f_dhdr = scntemp; | |
495 | } | |
496 | else if (strcmp (scntemp.s_name, ".bss") == 0) | |
497 | { | |
498 | f_bhdr = scntemp; | |
499 | } | |
500 | } | |
501 | } | |
502 | else | |
503 | { | |
504 | ERROR0 ("can't build a COFF file from scratch yet"); | |
505 | } | |
506 | ||
507 | /* Now we alter the contents of all the f_*hdr variables | |
508 | to correspond to what we want to dump. */ | |
509 | ||
510 | #ifdef USG_SHARED_LIBRARIES | |
511 | ||
512 | /* The amount of data we're adding to the file is distance from the | |
513 | * end of the original .data space to the current end of the .data | |
514 | * space. | |
515 | */ | |
516 | ||
1ba3de00 | 517 | bias = bss_start - (f_ohdr.data_start + f_dhdr.s_size); |
7dd63af1 RS |
518 | |
519 | #endif | |
520 | ||
521 | f_hdr.f_flags |= (F_RELFLG | F_EXEC); | |
522 | #ifdef TPIX | |
523 | f_hdr.f_nscns = 3; | |
524 | #endif | |
525 | #ifdef EXEC_MAGIC | |
526 | f_ohdr.magic = EXEC_MAGIC; | |
527 | #endif | |
528 | #ifndef NO_REMAP | |
529 | f_ohdr.text_start = (long) start_of_text (); | |
530 | f_ohdr.tsize = data_start - f_ohdr.text_start; | |
531 | f_ohdr.data_start = data_start; | |
532 | #endif /* NO_REMAP */ | |
533 | f_ohdr.dsize = bss_start - f_ohdr.data_start; | |
534 | f_ohdr.bsize = bss_end - bss_start; | |
535 | #ifndef KEEP_OLD_TEXT_SCNPTR | |
536 | /* On some machines, the old values are right. | |
537 | ??? Maybe on all machines with NO_REMAP. */ | |
538 | f_thdr.s_size = f_ohdr.tsize; | |
539 | f_thdr.s_scnptr = sizeof (f_hdr) + sizeof (f_ohdr); | |
540 | f_thdr.s_scnptr += (f_hdr.f_nscns) * (sizeof (f_thdr)); | |
541 | #endif /* KEEP_OLD_TEXT_SCNPTR */ | |
542 | #ifdef ADJUST_TEXT_SCNHDR_SIZE | |
543 | /* On some machines, `text size' includes all headers. */ | |
544 | f_thdr.s_size -= f_thdr.s_scnptr; | |
545 | #endif /* ADJUST_TEST_SCNHDR_SIZE */ | |
546 | lnnoptr = f_thdr.s_lnnoptr; | |
547 | #ifdef SECTION_ALIGNMENT | |
548 | /* Some systems require special alignment | |
549 | of the sections in the file itself. */ | |
550 | f_thdr.s_scnptr | |
551 | = (f_thdr.s_scnptr + SECTION_ALIGNMENT) & ~SECTION_ALIGNMENT; | |
552 | #endif /* SECTION_ALIGNMENT */ | |
553 | #ifdef TPIX | |
554 | f_thdr.s_scnptr = 0xd0; | |
555 | #endif | |
556 | text_scnptr = f_thdr.s_scnptr; | |
557 | #ifdef ADJUST_TEXTBASE | |
558 | text_scnptr = sizeof (f_hdr) + sizeof (f_ohdr) + (f_hdr.f_nscns) * (sizeof (f_thdr)); | |
559 | #endif | |
560 | #ifndef KEEP_OLD_PADDR | |
561 | f_dhdr.s_paddr = f_ohdr.data_start; | |
562 | #endif /* KEEP_OLD_PADDR */ | |
563 | f_dhdr.s_vaddr = f_ohdr.data_start; | |
564 | f_dhdr.s_size = f_ohdr.dsize; | |
565 | f_dhdr.s_scnptr = f_thdr.s_scnptr + f_thdr.s_size; | |
566 | #ifdef SECTION_ALIGNMENT | |
567 | /* Some systems require special alignment | |
568 | of the sections in the file itself. */ | |
569 | f_dhdr.s_scnptr | |
570 | = (f_dhdr.s_scnptr + SECTION_ALIGNMENT) & ~SECTION_ALIGNMENT; | |
571 | #endif /* SECTION_ALIGNMENT */ | |
572 | #ifdef DATA_SECTION_ALIGNMENT | |
573 | /* Some systems require special alignment | |
574 | of the data section only. */ | |
575 | f_dhdr.s_scnptr | |
576 | = (f_dhdr.s_scnptr + DATA_SECTION_ALIGNMENT) & ~DATA_SECTION_ALIGNMENT; | |
577 | #endif /* DATA_SECTION_ALIGNMENT */ | |
578 | data_scnptr = f_dhdr.s_scnptr; | |
579 | #ifndef KEEP_OLD_PADDR | |
580 | f_bhdr.s_paddr = f_ohdr.data_start + f_ohdr.dsize; | |
581 | #endif /* KEEP_OLD_PADDR */ | |
582 | f_bhdr.s_vaddr = f_ohdr.data_start + f_ohdr.dsize; | |
583 | f_bhdr.s_size = f_ohdr.bsize; | |
584 | f_bhdr.s_scnptr = 0L; | |
585 | #ifndef USG_SHARED_LIBRARIES | |
586 | bias = f_dhdr.s_scnptr + f_dhdr.s_size - block_copy_start; | |
587 | #endif | |
588 | ||
589 | if (f_hdr.f_symptr > 0L) | |
590 | { | |
591 | f_hdr.f_symptr += bias; | |
592 | } | |
593 | ||
594 | if (f_thdr.s_lnnoptr > 0L) | |
595 | { | |
596 | f_thdr.s_lnnoptr += bias; | |
597 | } | |
598 | ||
599 | #ifdef ADJUST_EXEC_HEADER | |
600 | ADJUST_EXEC_HEADER; | |
601 | #endif /* ADJUST_EXEC_HEADER */ | |
602 | ||
603 | if (write (new, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) | |
604 | { | |
605 | PERROR (new_name); | |
606 | } | |
607 | ||
608 | if (write (new, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) | |
609 | { | |
610 | PERROR (new_name); | |
611 | } | |
612 | ||
613 | #ifndef USG_SHARED_LIBRARIES | |
614 | ||
615 | if (write (new, &f_thdr, sizeof (f_thdr)) != sizeof (f_thdr)) | |
616 | { | |
617 | PERROR (new_name); | |
618 | } | |
619 | ||
620 | if (write (new, &f_dhdr, sizeof (f_dhdr)) != sizeof (f_dhdr)) | |
621 | { | |
622 | PERROR (new_name); | |
623 | } | |
624 | ||
625 | if (write (new, &f_bhdr, sizeof (f_bhdr)) != sizeof (f_bhdr)) | |
626 | { | |
627 | PERROR (new_name); | |
628 | } | |
629 | ||
630 | #else /* USG_SHARED_LIBRARIES */ | |
631 | ||
632 | /* The purpose of this code is to write out the new file's section | |
633 | * header table. | |
634 | * | |
635 | * Scan through the original file's sections. If the encountered | |
636 | * section is one we know (.text, .data or .bss), write out the | |
637 | * correct header. If it is a section we do not know (such as | |
638 | * .lib), adjust the address of where the section data is in the | |
639 | * file, and write out the header. | |
640 | * | |
eb8c3be9 | 641 | * If any section precedes .text or .data in the file, this code |
7dd63af1 RS |
642 | * will not adjust the file pointer for that section correctly. |
643 | */ | |
644 | ||
645 | lseek (a_out, sizeof (f_hdr) + sizeof (f_ohdr), 0); | |
646 | ||
647 | for (scns = f_hdr.f_nscns; scns > 0; scns--) | |
648 | { | |
649 | if (read (a_out, &scntemp, sizeof (scntemp)) != sizeof (scntemp)) | |
650 | PERROR (a_name); | |
651 | ||
652 | if (!strcmp (scntemp.s_name, f_thdr.s_name)) /* .text */ | |
653 | { | |
654 | if (write (new, &f_thdr, sizeof (f_thdr)) != sizeof (f_thdr)) | |
655 | PERROR (new_name); | |
656 | } | |
657 | else if (!strcmp (scntemp.s_name, f_dhdr.s_name)) /* .data */ | |
658 | { | |
659 | if (write (new, &f_dhdr, sizeof (f_dhdr)) != sizeof (f_dhdr)) | |
660 | PERROR (new_name); | |
661 | } | |
662 | else if (!strcmp (scntemp.s_name, f_bhdr.s_name)) /* .bss */ | |
663 | { | |
664 | if (write (new, &f_bhdr, sizeof (f_bhdr)) != sizeof (f_bhdr)) | |
665 | PERROR (new_name); | |
666 | } | |
667 | else | |
668 | { | |
669 | if (scntemp.s_scnptr) | |
670 | scntemp.s_scnptr += bias; | |
671 | if (write (new, &scntemp, sizeof (scntemp)) != sizeof (scntemp)) | |
672 | PERROR (new_name); | |
673 | } | |
674 | } | |
675 | #endif /* USG_SHARED_LIBRARIES */ | |
676 | ||
677 | return (0); | |
678 | ||
679 | #else /* if not COFF */ | |
680 | ||
681 | /* Get symbol table info from header of a.out file if given one. */ | |
682 | if (a_out >= 0) | |
683 | { | |
265a9e55 JB |
684 | #ifdef COFF_ENCAPSULATE |
685 | if (read (a_out, &coffheader, sizeof coffheader) != sizeof coffheader) | |
686 | { | |
687 | PERROR(a_name); | |
688 | } | |
689 | if (coffheader.f_magic != COFF_MAGIC) | |
690 | { | |
691 | ERROR1("%s doesn't have legal coff magic number\n", a_name); | |
692 | } | |
693 | #endif | |
7dd63af1 RS |
694 | if (read (a_out, &ohdr, sizeof hdr) != sizeof hdr) |
695 | { | |
696 | PERROR (a_name); | |
697 | } | |
698 | ||
699 | if (N_BADMAG (ohdr)) | |
700 | { | |
701 | ERROR1 ("invalid magic number in %s", a_name); | |
702 | } | |
703 | hdr = ohdr; | |
704 | } | |
705 | else | |
706 | { | |
265a9e55 JB |
707 | #ifdef COFF_ENCAPSULATE |
708 | /* We probably could without too much trouble. The code is in gld | |
709 | * but I don't have that much time or incentive. | |
710 | */ | |
711 | ERROR0 ("can't build a COFF file from scratch yet"); | |
3680bdc6 RS |
712 | #else |
713 | #ifdef MSDOS /* Demacs 1.1.1 91/10/16 HIRANO Satoshi */ | |
714 | bzero ((void *)&hdr, sizeof hdr); | |
265a9e55 | 715 | #else |
a5fd213f | 716 | bzero (&hdr, sizeof hdr); |
3680bdc6 | 717 | #endif |
265a9e55 | 718 | #endif |
7dd63af1 RS |
719 | } |
720 | ||
721 | unexec_text_start = (long) start_of_text (); | |
722 | unexec_data_start = data_start; | |
723 | ||
724 | /* Machine-dependent fixup for header, or maybe for unexec_text_start */ | |
725 | #ifdef ADJUST_EXEC_HEADER | |
726 | ADJUST_EXEC_HEADER; | |
727 | #endif /* ADJUST_EXEC_HEADER */ | |
728 | ||
729 | hdr.a_trsize = 0; | |
730 | hdr.a_drsize = 0; | |
731 | if (entry_address != 0) | |
732 | hdr.a_entry = entry_address; | |
733 | ||
734 | hdr.a_bss = bss_end - bss_start; | |
735 | hdr.a_data = bss_start - data_start; | |
736 | #ifdef NO_REMAP | |
737 | hdr.a_text = ohdr.a_text; | |
738 | #else /* not NO_REMAP */ | |
739 | hdr.a_text = data_start - unexec_text_start; | |
740 | ||
741 | #ifdef A_TEXT_OFFSET | |
742 | hdr.a_text += A_TEXT_OFFSET (ohdr); | |
743 | #endif | |
744 | ||
745 | #endif /* not NO_REMAP */ | |
746 | ||
265a9e55 JB |
747 | #ifdef COFF_ENCAPSULATE |
748 | /* We are encapsulating BSD format within COFF format. */ | |
749 | { | |
750 | struct coffscn *tp, *dp, *bp; | |
751 | tp = &coffheader.scns[0]; | |
752 | dp = &coffheader.scns[1]; | |
753 | bp = &coffheader.scns[2]; | |
754 | tp->s_size = hdr.a_text + sizeof(struct exec); | |
755 | dp->s_paddr = data_start; | |
756 | dp->s_vaddr = data_start; | |
757 | dp->s_size = hdr.a_data; | |
758 | bp->s_paddr = dp->s_vaddr + dp->s_size; | |
759 | bp->s_vaddr = bp->s_paddr; | |
760 | bp->s_size = hdr.a_bss; | |
761 | coffheader.tsize = tp->s_size; | |
762 | coffheader.dsize = dp->s_size; | |
763 | coffheader.bsize = bp->s_size; | |
764 | coffheader.text_start = tp->s_vaddr; | |
765 | coffheader.data_start = dp->s_vaddr; | |
766 | } | |
767 | if (write (new, &coffheader, sizeof coffheader) != sizeof coffheader) | |
768 | { | |
769 | PERROR(new_name); | |
770 | } | |
771 | #endif /* COFF_ENCAPSULATE */ | |
772 | ||
7dd63af1 RS |
773 | if (write (new, &hdr, sizeof hdr) != sizeof hdr) |
774 | { | |
775 | PERROR (new_name); | |
776 | } | |
777 | ||
778 | #ifdef A_TEXT_OFFSET | |
779 | hdr.a_text -= A_TEXT_OFFSET (ohdr); | |
780 | #endif | |
781 | ||
782 | return 0; | |
783 | ||
784 | #endif /* not COFF */ | |
785 | } | |
786 | \f | |
787 | /* **************************************************************** | |
788 | * copy_text_and_data | |
789 | * | |
790 | * Copy the text and data segments from memory to the new a.out | |
791 | */ | |
792 | static int | |
793 | copy_text_and_data (new, a_out) | |
794 | int new, a_out; | |
795 | { | |
796 | register char *end; | |
797 | register char *ptr; | |
798 | ||
799 | #ifdef COFF | |
800 | ||
801 | #ifdef USG_SHARED_LIBRARIES | |
802 | ||
803 | int scns; | |
804 | struct scnhdr scntemp; /* Temporary section header */ | |
805 | ||
806 | /* The purpose of this code is to write out the new file's section | |
807 | * contents. | |
808 | * | |
809 | * Step through the section table. If we know the section (.text, | |
810 | * .data) do the appropriate thing. Otherwise, if the section has | |
811 | * no allocated space in the file (.bss), do nothing. Otherwise, | |
812 | * the section has space allocated in the file, and is not a section | |
813 | * we know. So just copy it. | |
814 | */ | |
815 | ||
816 | lseek (a_out, sizeof (struct filehdr) + sizeof (struct aouthdr), 0); | |
817 | ||
818 | for (scns = f_hdr.f_nscns; scns > 0; scns--) | |
819 | { | |
820 | if (read (a_out, &scntemp, sizeof (scntemp)) != sizeof (scntemp)) | |
821 | PERROR ("temacs"); | |
822 | ||
823 | if (!strcmp (scntemp.s_name, ".text")) | |
824 | { | |
825 | lseek (new, (long) text_scnptr, 0); | |
826 | ptr = (char *) f_ohdr.text_start; | |
827 | end = ptr + f_ohdr.tsize; | |
828 | write_segment (new, ptr, end); | |
829 | } | |
830 | else if (!strcmp (scntemp.s_name, ".data")) | |
831 | { | |
832 | lseek (new, (long) data_scnptr, 0); | |
833 | ptr = (char *) f_ohdr.data_start; | |
834 | end = ptr + f_ohdr.dsize; | |
835 | write_segment (new, ptr, end); | |
836 | } | |
837 | else if (!scntemp.s_scnptr) | |
838 | ; /* do nothing - no data for this section */ | |
839 | else | |
840 | { | |
841 | char page[BUFSIZ]; | |
842 | int size, n; | |
843 | long old_a_out_ptr = lseek (a_out, 0, 1); | |
844 | ||
845 | lseek (a_out, scntemp.s_scnptr, 0); | |
846 | for (size = scntemp.s_size; size > 0; size -= sizeof (page)) | |
847 | { | |
848 | n = size > sizeof (page) ? sizeof (page) : size; | |
849 | if (read (a_out, page, n) != n || write (new, page, n) != n) | |
8116bbb0 | 850 | PERROR ("emacs"); |
7dd63af1 RS |
851 | } |
852 | lseek (a_out, old_a_out_ptr, 0); | |
853 | } | |
854 | } | |
855 | ||
856 | #else /* COFF, but not USG_SHARED_LIBRARIES */ | |
857 | ||
858 | lseek (new, (long) text_scnptr, 0); | |
859 | ptr = (char *) f_ohdr.text_start; | |
860 | #ifdef HEADER_INCL_IN_TEXT | |
861 | /* For Gould UTX/32, text starts after headers */ | |
862 | ptr = (char *) (ptr + text_scnptr); | |
863 | #endif /* HEADER_INCL_IN_TEXT */ | |
864 | end = ptr + f_ohdr.tsize; | |
865 | write_segment (new, ptr, end); | |
866 | ||
867 | lseek (new, (long) data_scnptr, 0); | |
868 | ptr = (char *) f_ohdr.data_start; | |
869 | end = ptr + f_ohdr.dsize; | |
870 | write_segment (new, ptr, end); | |
871 | ||
872 | #endif /* USG_SHARED_LIBRARIES */ | |
873 | ||
874 | #else /* if not COFF */ | |
875 | ||
876 | /* Some machines count the header as part of the text segment. | |
877 | That is to say, the header appears in core | |
878 | just before the address that start_of_text () returns. | |
879 | For them, N_TXTOFF is the place where the header goes. | |
880 | We must adjust the seek to the place after the header. | |
881 | Note that at this point hdr.a_text does *not* count | |
882 | the extra A_TEXT_OFFSET bytes, only the actual bytes of code. */ | |
883 | ||
884 | #ifdef A_TEXT_SEEK | |
885 | lseek (new, (long) A_TEXT_SEEK (hdr), 0); | |
886 | #else | |
887 | lseek (new, (long) N_TXTOFF (hdr), 0); | |
888 | #endif /* no A_TEXT_SEEK */ | |
889 | ||
890 | ptr = (char *) unexec_text_start; | |
891 | end = ptr + hdr.a_text; | |
892 | write_segment (new, ptr, end); | |
893 | ||
894 | ptr = (char *) unexec_data_start; | |
895 | end = ptr + hdr.a_data; | |
896 | /* This lseek is certainly incorrect when A_TEXT_OFFSET | |
897 | and I believe it is a no-op otherwise. | |
898 | Let's see if its absence ever fails. */ | |
899 | /* lseek (new, (long) N_TXTOFF (hdr) + hdr.a_text, 0); */ | |
900 | write_segment (new, ptr, end); | |
901 | ||
902 | #endif /* not COFF */ | |
903 | ||
904 | return 0; | |
905 | } | |
906 | ||
907 | write_segment (new, ptr, end) | |
908 | int new; | |
909 | register char *ptr, *end; | |
910 | { | |
911 | register int i, nwrite, ret; | |
912 | char buf[80]; | |
913 | extern int errno; | |
914 | char zeros[128]; | |
915 | ||
916 | bzero (zeros, sizeof zeros); | |
917 | ||
918 | for (i = 0; ptr < end;) | |
919 | { | |
920 | /* distance to next multiple of 128. */ | |
921 | nwrite = (((int) ptr + 128) & -128) - (int) ptr; | |
922 | /* But not beyond specified end. */ | |
923 | if (nwrite > end - ptr) nwrite = end - ptr; | |
924 | ret = write (new, ptr, nwrite); | |
925 | /* If write gets a page fault, it means we reached | |
926 | a gap between the old text segment and the old data segment. | |
927 | This gap has probably been remapped into part of the text segment. | |
928 | So write zeros for it. */ | |
3680bdc6 RS |
929 | if (ret == -1 |
930 | #ifdef EFAULT | |
931 | && errno == EFAULT | |
932 | #endif | |
933 | ) | |
7dd63af1 RS |
934 | write (new, zeros, nwrite); |
935 | else if (nwrite != ret) | |
936 | { | |
937 | sprintf (buf, | |
938 | "unexec write failure: addr 0x%x, fileno %d, size 0x%x, wrote 0x%x, errno %d", | |
939 | ptr, new, nwrite, ret, errno); | |
940 | PERROR (buf); | |
941 | } | |
942 | i += nwrite; | |
943 | ptr += nwrite; | |
944 | } | |
945 | } | |
946 | \f | |
947 | /* **************************************************************** | |
948 | * copy_sym | |
949 | * | |
950 | * Copy the relocation information and symbol table from the a.out to the new | |
951 | */ | |
952 | static int | |
953 | copy_sym (new, a_out, a_name, new_name) | |
954 | int new, a_out; | |
955 | char *a_name, *new_name; | |
956 | { | |
957 | char page[1024]; | |
958 | int n; | |
959 | ||
960 | if (a_out < 0) | |
961 | return 0; | |
962 | ||
963 | #ifdef COFF | |
964 | if (SYMS_START == 0L) | |
965 | return 0; | |
966 | #endif /* COFF */ | |
967 | ||
968 | #ifdef COFF | |
969 | if (lnnoptr) /* if there is line number info */ | |
970 | lseek (a_out, lnnoptr, 0); /* start copying from there */ | |
971 | else | |
972 | #endif /* COFF */ | |
973 | lseek (a_out, SYMS_START, 0); /* Position a.out to symtab. */ | |
974 | ||
975 | while ((n = read (a_out, page, sizeof page)) > 0) | |
976 | { | |
977 | if (write (new, page, n) != n) | |
978 | { | |
979 | PERROR (new_name); | |
980 | } | |
981 | } | |
982 | if (n < 0) | |
983 | { | |
984 | PERROR (a_name); | |
985 | } | |
986 | return 0; | |
987 | } | |
988 | \f | |
989 | /* **************************************************************** | |
990 | * mark_x | |
991 | * | |
eb8c3be9 | 992 | * After successfully building the new a.out, mark it executable |
7dd63af1 RS |
993 | */ |
994 | static void | |
995 | mark_x (name) | |
996 | char *name; | |
997 | { | |
998 | struct stat sbuf; | |
999 | int um; | |
1000 | int new = 0; /* for PERROR */ | |
1001 | ||
1002 | um = umask (777); | |
1003 | umask (um); | |
1004 | if (stat (name, &sbuf) == -1) | |
1005 | { | |
1006 | PERROR (name); | |
1007 | } | |
1008 | sbuf.st_mode |= 0111 & ~um; | |
1009 | if (chmod (name, sbuf.st_mode) == -1) | |
1010 | PERROR (name); | |
1011 | } | |
1012 | \f | |
1013 | #ifdef COFF | |
1014 | #ifndef COFF_BSD_SYMBOLS | |
1015 | ||
1016 | /* | |
1017 | * If the COFF file contains a symbol table and a line number section, | |
1018 | * then any auxiliary entries that have values for x_lnnoptr must | |
1019 | * be adjusted by the amount that the line number section has moved | |
1020 | * in the file (bias computed in make_hdr). The #@$%&* designers of | |
1021 | * the auxiliary entry structures used the absolute file offsets for | |
1022 | * the line number entry rather than an offset from the start of the | |
1023 | * line number section! | |
1024 | * | |
1025 | * When I figure out how to scan through the symbol table and pick out | |
1026 | * the auxiliary entries that need adjustment, this routine will | |
1027 | * be fixed. As it is now, all such entries are wrong and sdb | |
1028 | * will complain. Fred Fish, UniSoft Systems Inc. | |
1029 | */ | |
1030 | ||
1031 | /* This function is probably very slow. Instead of reopening the new | |
1032 | file for input and output it should copy from the old to the new | |
1033 | using the two descriptors already open (WRITEDESC and READDESC). | |
1034 | Instead of reading one small structure at a time it should use | |
1035 | a reasonable size buffer. But I don't have time to work on such | |
1036 | things, so I am installing it as submitted to me. -- RMS. */ | |
1037 | ||
1038 | adjust_lnnoptrs (writedesc, readdesc, new_name) | |
1039 | int writedesc; | |
1040 | int readdesc; | |
1041 | char *new_name; | |
1042 | { | |
1043 | register int nsyms; | |
1044 | register int new; | |
91bac16a | 1045 | #if defined (amdahl_uts) || defined (pfa) |
7dd63af1 RS |
1046 | SYMENT symentry; |
1047 | AUXENT auxentry; | |
1048 | #else | |
1049 | struct syment symentry; | |
1050 | union auxent auxentry; | |
1051 | #endif | |
1052 | ||
1053 | if (!lnnoptr || !f_hdr.f_symptr) | |
1054 | return 0; | |
1055 | ||
3680bdc6 RS |
1056 | #ifdef MSDOS |
1057 | if ((new = writedesc) < 0) | |
1058 | #else | |
7dd63af1 | 1059 | if ((new = open (new_name, 2)) < 0) |
3680bdc6 | 1060 | #endif |
7dd63af1 RS |
1061 | { |
1062 | PERROR (new_name); | |
1063 | return -1; | |
1064 | } | |
1065 | ||
1066 | lseek (new, f_hdr.f_symptr, 0); | |
1067 | for (nsyms = 0; nsyms < f_hdr.f_nsyms; nsyms++) | |
1068 | { | |
1069 | read (new, &symentry, SYMESZ); | |
1070 | if (symentry.n_numaux) | |
1071 | { | |
1072 | read (new, &auxentry, AUXESZ); | |
1073 | nsyms++; | |
1ba3de00 RS |
1074 | if (ISFCN (symentry.n_type) || symentry.n_type == 0x2400) |
1075 | { | |
1076 | auxentry.x_sym.x_fcnary.x_fcn.x_lnnoptr += bias; | |
1077 | lseek (new, -AUXESZ, 1); | |
1078 | write (new, &auxentry, AUXESZ); | |
1079 | } | |
7dd63af1 RS |
1080 | } |
1081 | } | |
3680bdc6 | 1082 | #ifndef MSDOS |
7dd63af1 | 1083 | close (new); |
3680bdc6 RS |
1084 | #endif |
1085 | return 0; | |
7dd63af1 RS |
1086 | } |
1087 | ||
1088 | #endif /* COFF_BSD_SYMBOLS */ | |
1089 | ||
1090 | #endif /* COFF */ | |
1091 | ||
1092 | #endif /* not CANNOT_UNEXEC */ | |
1093 | ||
1094 | #endif /* not CANNOT_DUMP */ |