(timeout-event-p): Function deleted.
[emacs.git] / src / unexec.c
blob65d36ba8688e5a665dcd0753e45d45444543a91f
1 /* Copyright (C) 1985,86,87,88,92,93,94 Free Software Foundation, Inc.
3 This file is part of GNU Emacs.
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 2, or (at your option)
8 any later version.
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.
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, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA. */
22 * unexec.c - Convert a running program into an a.out file.
24 * Author: Spencer W. Thomas
25 * Computer Science Dept.
26 * University of Utah
27 * Date: Tue Mar 2 1982
28 * Modified heavily since then.
30 * Synopsis:
31 * unexec (new_name, a_name, data_start, bss_start, entry_address)
32 * char *new_name, *a_name;
33 * unsigned data_start, bss_start, entry_address;
35 * Takes a snapshot of the program and makes an a.out format file in the
36 * file named by the string argument new_name.
37 * If a_name is non-NULL, the symbol table will be taken from the given file.
38 * On some machines, an existing a_name file is required.
40 * The boundaries within the a.out file may be adjusted with the data_start
41 * and bss_start arguments. Either or both may be given as 0 for defaults.
43 * Data_start gives the boundary between the text segment and the data
44 * segment of the program. The text segment can contain shared, read-only
45 * program code and literal data, while the data segment is always unshared
46 * and unprotected. Data_start gives the lowest unprotected address.
47 * The value you specify may be rounded down to a suitable boundary
48 * as required by the machine you are using.
50 * Specifying zero for data_start means the boundary between text and data
51 * should not be the same as when the program was loaded.
52 * If NO_REMAP is defined, the argument data_start is ignored and the
53 * segment boundaries are never changed.
55 * Bss_start indicates how much of the data segment is to be saved in the
56 * a.out file and restored when the program is executed. It gives the lowest
57 * unsaved address, and is rounded up to a page boundary. The default when 0
58 * is given assumes that the entire data segment is to be stored, including
59 * the previous data and bss as well as any additional storage allocated with
60 * break (2).
62 * The new file is set up to start at entry_address.
64 * If you make improvements I'd like to get them too.
65 * harpo!utah-cs!thomas, thomas@Utah-20
69 /* Modified to support SysVr3 shared libraries by James Van Artsdalen
70 * of Dell Computer Corporation. james@bigtex.cactus.org.
73 /* There are several compilation parameters affecting unexec:
75 * COFF
77 Define this if your system uses COFF for executables.
79 * COFF_ENCAPSULATE
81 Define this if you are using the GNU coff encapsulated a.out format.
82 This is closer to a.out than COFF. You should *not* define COFF if
83 you define COFF_ENCAPSULATE
85 Otherwise we assume you use Berkeley format.
87 * NO_REMAP
89 Define this if you do not want to try to save Emacs's pure data areas
90 as part of the text segment.
92 Saving them as text is good because it allows users to share more.
94 However, on machines that locate the text area far from the data area,
95 the boundary cannot feasibly be moved. Such machines require
96 NO_REMAP.
98 Also, remapping can cause trouble with the built-in startup routine
99 /lib/crt0.o, which defines `environ' as an initialized variable.
100 Dumping `environ' as pure does not work! So, to use remapping,
101 you must write a startup routine for your machine in Emacs's crt0.c.
102 If NO_REMAP is defined, Emacs uses the system's crt0.o.
104 * SECTION_ALIGNMENT
106 Some machines that use COFF executables require that each section
107 start on a certain boundary *in the COFF file*. Such machines should
108 define SECTION_ALIGNMENT to a mask of the low-order bits that must be
109 zero on such a boundary. This mask is used to control padding between
110 segments in the COFF file.
112 If SECTION_ALIGNMENT is not defined, the segments are written
113 consecutively with no attempt at alignment. This is right for
114 unmodified system V.
116 * SEGMENT_MASK
118 Some machines require that the beginnings and ends of segments
119 *in core* be on certain boundaries. For most machines, a page
120 boundary is sufficient. That is the default. When a larger
121 boundary is needed, define SEGMENT_MASK to a mask of
122 the bits that must be zero on such a boundary.
124 * A_TEXT_OFFSET(HDR)
126 Some machines count the a.out header as part of the size of the text
127 segment (a_text); they may actually load the header into core as the
128 first data in the text segment. Some have additional padding between
129 the header and the real text of the program that is counted in a_text.
131 For these machines, define A_TEXT_OFFSET(HDR) to examine the header
132 structure HDR and return the number of bytes to add to `a_text'
133 before writing it (above and beyond the number of bytes of actual
134 program text). HDR's standard fields are already correct, except that
135 this adjustment to the `a_text' field has not yet been made;
136 thus, the amount of offset can depend on the data in the file.
138 * A_TEXT_SEEK(HDR)
140 If defined, this macro specifies the number of bytes to seek into the
141 a.out file before starting to write the text segment.
143 * EXEC_MAGIC
145 For machines using COFF, this macro, if defined, is a value stored
146 into the magic number field of the output file.
148 * ADJUST_EXEC_HEADER
150 This macro can be used to generate statements to adjust or
151 initialize nonstandard fields in the file header
153 * ADDR_CORRECT(ADDR)
155 Macro to correct an int which is the bit pattern of a pointer to a byte
156 into an int which is the number of a byte.
158 This macro has a default definition which is usually right.
159 This default definition is a no-op on most machines (where a
160 pointer looks like an int) but not on all machines.
164 #ifndef emacs
165 #define PERROR(arg) perror (arg); return -1
166 #else
167 #define IN_UNEXEC
168 #include <config.h>
169 #define PERROR(file) report_error (file, new)
170 #endif
172 #ifndef CANNOT_DUMP /* all rest of file! */
174 #ifdef COFF_ENCAPSULATE
175 int need_coff_header = 1;
176 #include <coff-encap/a.out.encap.h> /* The location might be a poor assumption */
177 #else
178 #ifdef MSDOS
179 #include <coff.h>
180 #define filehdr external_filehdr
181 #define scnhdr external_scnhdr
182 #define syment external_syment
183 #define auxent external_auxent
184 #define n_numaux e_numaux
185 #define n_type e_type
186 struct aouthdr
188 unsigned short magic; /* type of file */
189 unsigned short vstamp; /* version stamp */
190 unsigned long tsize; /* text size in bytes, padded to FW bdry*/
191 unsigned long dsize; /* initialized data " " */
192 unsigned long bsize; /* uninitialized data " " */
193 unsigned long entry; /* entry pt. */
194 unsigned long text_start;/* base of text used for this file */
195 unsigned long data_start;/* base of data used for this file */
199 #else /* not MSDOS */
200 #include <a.out.h>
201 #endif /* not MSDOS */
202 #endif
204 /* Define getpagesize if the system does not.
205 Note that this may depend on symbols defined in a.out.h. */
206 #include "getpagesize.h"
208 #ifndef makedev /* Try to detect types.h already loaded */
209 #include <sys/types.h>
210 #endif /* makedev */
211 #include <stdio.h>
212 #include <sys/stat.h>
213 #include <errno.h>
215 #include <sys/file.h> /* Must be after sys/types.h for USG and BSD4_1*/
217 #ifdef USG5
218 #include <fcntl.h>
219 #endif
221 #ifndef O_RDONLY
222 #define O_RDONLY 0
223 #endif
224 #ifndef O_RDWR
225 #define O_RDWR 2
226 #endif
229 extern char *start_of_text (); /* Start of text */
230 extern char *start_of_data (); /* Start of initialized data */
232 #ifdef COFF
233 static long block_copy_start; /* Old executable start point */
234 static struct filehdr f_hdr; /* File header */
235 static struct aouthdr f_ohdr; /* Optional file header (a.out) */
236 long bias; /* Bias to add for growth */
237 long lnnoptr; /* Pointer to line-number info within file */
238 #define SYMS_START block_copy_start
240 static long text_scnptr;
241 static long data_scnptr;
243 #else /* not COFF */
245 #ifdef HPUX
246 extern void *sbrk ();
247 #else
248 #if 0
249 /* Some systems with __STDC__ compilers still declare this `char *' in some
250 header file, and our declaration conflicts. The return value is always
251 cast, so it should be harmless to leave it undefined. Hopefully
252 machines with different size pointers and ints declare sbrk in a header
253 file. */
254 #ifdef __STDC__
255 extern void *sbrk ();
256 #else
257 extern char *sbrk ();
258 #endif /* __STDC__ */
259 #endif
260 #endif /* HPUX */
262 #define SYMS_START ((long) N_SYMOFF (ohdr))
264 /* Some machines override the structure name for an a.out header. */
265 #ifndef EXEC_HDR_TYPE
266 #define EXEC_HDR_TYPE struct exec
267 #endif
269 #ifdef HPUX
270 #ifdef HP9000S200_ID
271 #define MY_ID HP9000S200_ID
272 #else
273 #include <model.h>
274 #define MY_ID MYSYS
275 #endif /* no HP9000S200_ID */
276 static MAGIC OLDMAGIC = {MY_ID, SHARE_MAGIC};
277 static MAGIC NEWMAGIC = {MY_ID, DEMAND_MAGIC};
278 #define N_TXTOFF(x) TEXT_OFFSET(x)
279 #define N_SYMOFF(x) LESYM_OFFSET(x)
280 static EXEC_HDR_TYPE hdr, ohdr;
282 #else /* not HPUX */
284 #if defined (USG) && !defined (IBMAIX) && !defined (IRIS) && !defined (COFF_ENCAPSULATE) && !defined (LINUX)
285 static struct bhdr hdr, ohdr;
286 #define a_magic fmagic
287 #define a_text tsize
288 #define a_data dsize
289 #define a_bss bsize
290 #define a_syms ssize
291 #define a_trsize rtsize
292 #define a_drsize rdsize
293 #define a_entry entry
294 #define N_BADMAG(x) \
295 (((x).fmagic)!=OMAGIC && ((x).fmagic)!=NMAGIC &&\
296 ((x).fmagic)!=FMAGIC && ((x).fmagic)!=IMAGIC)
297 #define NEWMAGIC FMAGIC
298 #else /* IRIS or IBMAIX or not USG */
299 static EXEC_HDR_TYPE hdr, ohdr;
300 #define NEWMAGIC ZMAGIC
301 #endif /* IRIS or IBMAIX not USG */
302 #endif /* not HPUX */
304 static int unexec_text_start;
305 static int unexec_data_start;
307 #ifdef COFF_ENCAPSULATE
308 /* coffheader is defined in the GNU a.out.encap.h file. */
309 struct coffheader coffheader;
310 #endif
312 #endif /* not COFF */
314 static int pagemask;
316 /* Correct an int which is the bit pattern of a pointer to a byte
317 into an int which is the number of a byte.
318 This is a no-op on ordinary machines, but not on all. */
320 #ifndef ADDR_CORRECT /* Let m-*.h files override this definition */
321 #define ADDR_CORRECT(x) ((char *)(x) - (char*)0)
322 #endif
324 #ifdef emacs
326 #include "lisp.h"
328 static
329 report_error (file, fd)
330 char *file;
331 int fd;
333 if (fd)
334 close (fd);
335 report_file_error ("Cannot unexec", Fcons (build_string (file), Qnil));
337 #endif /* emacs */
339 #define ERROR0(msg) report_error_1 (new, msg, 0, 0); return -1
340 #define ERROR1(msg,x) report_error_1 (new, msg, x, 0); return -1
341 #define ERROR2(msg,x,y) report_error_1 (new, msg, x, y); return -1
343 static
344 report_error_1 (fd, msg, a1, a2)
345 int fd;
346 char *msg;
347 int a1, a2;
349 close (fd);
350 #ifdef emacs
351 error (msg, a1, a2);
352 #else
353 fprintf (stderr, msg, a1, a2);
354 fprintf (stderr, "\n");
355 #endif
358 static int make_hdr ();
359 static int copy_text_and_data ();
360 static int copy_sym ();
361 static void mark_x ();
363 /* ****************************************************************
364 * unexec
366 * driving logic.
368 unexec (new_name, a_name, data_start, bss_start, entry_address)
369 char *new_name, *a_name;
370 unsigned data_start, bss_start, entry_address;
372 int new, a_out = -1;
374 if (a_name && (a_out = open (a_name, O_RDONLY)) < 0)
376 PERROR (a_name);
378 if ((new = creat (new_name, 0666)) < 0)
380 PERROR (new_name);
383 if (make_hdr (new, a_out, data_start, bss_start, entry_address, a_name, new_name) < 0
384 || copy_text_and_data (new, a_out) < 0
385 || copy_sym (new, a_out, a_name, new_name) < 0
386 #ifdef COFF
387 #ifndef COFF_BSD_SYMBOLS
388 || adjust_lnnoptrs (new, a_out, new_name) < 0
389 #endif
390 #endif
393 close (new);
394 /* unlink (new_name); /* Failed, unlink new a.out */
395 return -1;
398 close (new);
399 if (a_out >= 0)
400 close (a_out);
401 mark_x (new_name);
402 return 0;
405 /* ****************************************************************
406 * make_hdr
408 * Make the header in the new a.out from the header in core.
409 * Modify the text and data sizes.
411 static int
412 make_hdr (new, a_out, data_start, bss_start, entry_address, a_name, new_name)
413 int new, a_out;
414 unsigned data_start, bss_start, entry_address;
415 char *a_name;
416 char *new_name;
418 int tem;
419 #ifdef COFF
420 auto struct scnhdr f_thdr; /* Text section header */
421 auto struct scnhdr f_dhdr; /* Data section header */
422 auto struct scnhdr f_bhdr; /* Bss section header */
423 auto struct scnhdr scntemp; /* Temporary section header */
424 register int scns;
425 #endif /* COFF */
426 #ifdef USG_SHARED_LIBRARIES
427 extern unsigned int bss_end;
428 #else
429 unsigned int bss_end;
430 #endif
432 pagemask = getpagesize () - 1;
434 /* Adjust text/data boundary. */
435 #ifdef NO_REMAP
436 data_start = (int) start_of_data ();
437 #else /* not NO_REMAP */
438 if (!data_start)
439 data_start = (int) start_of_data ();
440 #endif /* not NO_REMAP */
441 data_start = ADDR_CORRECT (data_start);
443 #ifdef SEGMENT_MASK
444 data_start = data_start & ~SEGMENT_MASK; /* (Down) to segment boundary. */
445 #else
446 data_start = data_start & ~pagemask; /* (Down) to page boundary. */
447 #endif
449 bss_end = ADDR_CORRECT (sbrk (0)) + pagemask;
450 bss_end &= ~ pagemask;
452 /* Adjust data/bss boundary. */
453 if (bss_start != 0)
455 bss_start = (ADDR_CORRECT (bss_start) + pagemask);
456 /* (Up) to page bdry. */
457 bss_start &= ~ pagemask;
458 if (bss_start > bss_end)
460 ERROR1 ("unexec: Specified bss_start (%u) is past end of program",
461 bss_start);
464 else
465 bss_start = bss_end;
467 if (data_start > bss_start) /* Can't have negative data size. */
469 ERROR2 ("unexec: data_start (%u) can't be greater than bss_start (%u)",
470 data_start, bss_start);
473 #ifdef COFF
474 /* Salvage as much info from the existing file as possible */
475 if (a_out >= 0)
477 if (read (a_out, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr))
479 PERROR (a_name);
481 block_copy_start += sizeof (f_hdr);
482 if (f_hdr.f_opthdr > 0)
484 if (read (a_out, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr))
486 PERROR (a_name);
488 block_copy_start += sizeof (f_ohdr);
490 /* Loop through section headers, copying them in */
491 lseek (a_out, sizeof (f_hdr) + f_hdr.f_opthdr, 0);
492 for (scns = f_hdr.f_nscns; scns > 0; scns--) {
493 if (read (a_out, &scntemp, sizeof (scntemp)) != sizeof (scntemp))
495 PERROR (a_name);
497 if (scntemp.s_scnptr > 0L)
499 if (block_copy_start < scntemp.s_scnptr + scntemp.s_size)
500 block_copy_start = scntemp.s_scnptr + scntemp.s_size;
502 if (strcmp (scntemp.s_name, ".text") == 0)
504 f_thdr = scntemp;
506 else if (strcmp (scntemp.s_name, ".data") == 0)
508 f_dhdr = scntemp;
510 else if (strcmp (scntemp.s_name, ".bss") == 0)
512 f_bhdr = scntemp;
516 else
518 ERROR0 ("can't build a COFF file from scratch yet");
521 /* Now we alter the contents of all the f_*hdr variables
522 to correspond to what we want to dump. */
524 #ifdef USG_SHARED_LIBRARIES
526 /* The amount of data we're adding to the file is distance from the
527 * end of the original .data space to the current end of the .data
528 * space.
531 bias = bss_start - (f_ohdr.data_start + f_dhdr.s_size);
533 #endif
535 f_hdr.f_flags |= (F_RELFLG | F_EXEC);
536 #ifdef TPIX
537 f_hdr.f_nscns = 3;
538 #endif
539 #ifdef EXEC_MAGIC
540 f_ohdr.magic = EXEC_MAGIC;
541 #endif
542 #ifndef NO_REMAP
543 f_ohdr.text_start = (long) start_of_text ();
544 f_ohdr.tsize = data_start - f_ohdr.text_start;
545 f_ohdr.data_start = data_start;
546 #endif /* NO_REMAP */
547 f_ohdr.dsize = bss_start - f_ohdr.data_start;
548 f_ohdr.bsize = bss_end - bss_start;
549 #ifndef KEEP_OLD_TEXT_SCNPTR
550 /* On some machines, the old values are right.
551 ??? Maybe on all machines with NO_REMAP. */
552 f_thdr.s_size = f_ohdr.tsize;
553 f_thdr.s_scnptr = sizeof (f_hdr) + sizeof (f_ohdr);
554 f_thdr.s_scnptr += (f_hdr.f_nscns) * (sizeof (f_thdr));
555 #endif /* KEEP_OLD_TEXT_SCNPTR */
556 #ifdef ADJUST_TEXT_SCNHDR_SIZE
557 /* On some machines, `text size' includes all headers. */
558 f_thdr.s_size -= f_thdr.s_scnptr;
559 #endif /* ADJUST_TEST_SCNHDR_SIZE */
560 lnnoptr = f_thdr.s_lnnoptr;
561 #ifdef SECTION_ALIGNMENT
562 /* Some systems require special alignment
563 of the sections in the file itself. */
564 f_thdr.s_scnptr
565 = (f_thdr.s_scnptr + SECTION_ALIGNMENT) & ~SECTION_ALIGNMENT;
566 #endif /* SECTION_ALIGNMENT */
567 #ifdef TPIX
568 f_thdr.s_scnptr = 0xd0;
569 #endif
570 text_scnptr = f_thdr.s_scnptr;
571 #ifdef ADJUST_TEXTBASE
572 text_scnptr = sizeof (f_hdr) + sizeof (f_ohdr) + (f_hdr.f_nscns) * (sizeof (f_thdr));
573 #endif
574 #ifndef KEEP_OLD_PADDR
575 f_dhdr.s_paddr = f_ohdr.data_start;
576 #endif /* KEEP_OLD_PADDR */
577 f_dhdr.s_vaddr = f_ohdr.data_start;
578 f_dhdr.s_size = f_ohdr.dsize;
579 f_dhdr.s_scnptr = f_thdr.s_scnptr + f_thdr.s_size;
580 #ifdef SECTION_ALIGNMENT
581 /* Some systems require special alignment
582 of the sections in the file itself. */
583 f_dhdr.s_scnptr
584 = (f_dhdr.s_scnptr + SECTION_ALIGNMENT) & ~SECTION_ALIGNMENT;
585 #endif /* SECTION_ALIGNMENT */
586 #ifdef DATA_SECTION_ALIGNMENT
587 /* Some systems require special alignment
588 of the data section only. */
589 f_dhdr.s_scnptr
590 = (f_dhdr.s_scnptr + DATA_SECTION_ALIGNMENT) & ~DATA_SECTION_ALIGNMENT;
591 #endif /* DATA_SECTION_ALIGNMENT */
592 data_scnptr = f_dhdr.s_scnptr;
593 #ifndef KEEP_OLD_PADDR
594 f_bhdr.s_paddr = f_ohdr.data_start + f_ohdr.dsize;
595 #endif /* KEEP_OLD_PADDR */
596 f_bhdr.s_vaddr = f_ohdr.data_start + f_ohdr.dsize;
597 f_bhdr.s_size = f_ohdr.bsize;
598 f_bhdr.s_scnptr = 0L;
599 #ifndef USG_SHARED_LIBRARIES
600 bias = f_dhdr.s_scnptr + f_dhdr.s_size - block_copy_start;
601 #endif
603 if (f_hdr.f_symptr > 0L)
605 f_hdr.f_symptr += bias;
608 if (f_thdr.s_lnnoptr > 0L)
610 f_thdr.s_lnnoptr += bias;
613 #ifdef ADJUST_EXEC_HEADER
614 ADJUST_EXEC_HEADER;
615 #endif /* ADJUST_EXEC_HEADER */
617 if (write (new, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr))
619 PERROR (new_name);
622 if (write (new, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr))
624 PERROR (new_name);
627 #ifndef USG_SHARED_LIBRARIES
629 if (write (new, &f_thdr, sizeof (f_thdr)) != sizeof (f_thdr))
631 PERROR (new_name);
634 if (write (new, &f_dhdr, sizeof (f_dhdr)) != sizeof (f_dhdr))
636 PERROR (new_name);
639 if (write (new, &f_bhdr, sizeof (f_bhdr)) != sizeof (f_bhdr))
641 PERROR (new_name);
644 #else /* USG_SHARED_LIBRARIES */
646 /* The purpose of this code is to write out the new file's section
647 * header table.
649 * Scan through the original file's sections. If the encountered
650 * section is one we know (.text, .data or .bss), write out the
651 * correct header. If it is a section we do not know (such as
652 * .lib), adjust the address of where the section data is in the
653 * file, and write out the header.
655 * If any section precedes .text or .data in the file, this code
656 * will not adjust the file pointer for that section correctly.
659 /* This used to use sizeof (f_ohdr) instead of .f_opthdr.
660 .f_opthdr is said to be right when there is no optional header. */
661 lseek (a_out, sizeof (f_hdr) + f_hdr.f_opthdr, 0);
663 for (scns = f_hdr.f_nscns; scns > 0; scns--)
665 if (read (a_out, &scntemp, sizeof (scntemp)) != sizeof (scntemp))
666 PERROR (a_name);
668 if (!strcmp (scntemp.s_name, f_thdr.s_name)) /* .text */
670 if (write (new, &f_thdr, sizeof (f_thdr)) != sizeof (f_thdr))
671 PERROR (new_name);
673 else if (!strcmp (scntemp.s_name, f_dhdr.s_name)) /* .data */
675 if (write (new, &f_dhdr, sizeof (f_dhdr)) != sizeof (f_dhdr))
676 PERROR (new_name);
678 else if (!strcmp (scntemp.s_name, f_bhdr.s_name)) /* .bss */
680 if (write (new, &f_bhdr, sizeof (f_bhdr)) != sizeof (f_bhdr))
681 PERROR (new_name);
683 else
685 if (scntemp.s_scnptr)
686 scntemp.s_scnptr += bias;
687 if (write (new, &scntemp, sizeof (scntemp)) != sizeof (scntemp))
688 PERROR (new_name);
691 #endif /* USG_SHARED_LIBRARIES */
693 return (0);
695 #else /* if not COFF */
697 /* Get symbol table info from header of a.out file if given one. */
698 if (a_out >= 0)
700 #ifdef COFF_ENCAPSULATE
701 if (read (a_out, &coffheader, sizeof coffheader) != sizeof coffheader)
703 PERROR(a_name);
705 if (coffheader.f_magic != COFF_MAGIC)
707 ERROR1("%s doesn't have legal coff magic number\n", a_name);
709 #endif
710 if (read (a_out, &ohdr, sizeof hdr) != sizeof hdr)
712 PERROR (a_name);
715 if (N_BADMAG (ohdr))
717 ERROR1 ("invalid magic number in %s", a_name);
719 hdr = ohdr;
721 else
723 #ifdef COFF_ENCAPSULATE
724 /* We probably could without too much trouble. The code is in gld
725 * but I don't have that much time or incentive.
727 ERROR0 ("can't build a COFF file from scratch yet");
728 #else
729 #ifdef MSDOS /* Demacs 1.1.1 91/10/16 HIRANO Satoshi */
730 bzero ((void *)&hdr, sizeof hdr);
731 #else
732 bzero (&hdr, sizeof hdr);
733 #endif
734 #endif
737 unexec_text_start = (long) start_of_text ();
738 unexec_data_start = data_start;
740 /* Machine-dependent fixup for header, or maybe for unexec_text_start */
741 #ifdef ADJUST_EXEC_HEADER
742 ADJUST_EXEC_HEADER;
743 #endif /* ADJUST_EXEC_HEADER */
745 hdr.a_trsize = 0;
746 hdr.a_drsize = 0;
747 if (entry_address != 0)
748 hdr.a_entry = entry_address;
750 hdr.a_bss = bss_end - bss_start;
751 hdr.a_data = bss_start - data_start;
752 #ifdef NO_REMAP
753 hdr.a_text = ohdr.a_text;
754 #else /* not NO_REMAP */
755 hdr.a_text = data_start - unexec_text_start;
757 #ifdef A_TEXT_OFFSET
758 hdr.a_text += A_TEXT_OFFSET (ohdr);
759 #endif
761 #endif /* not NO_REMAP */
763 #ifdef COFF_ENCAPSULATE
764 /* We are encapsulating BSD format within COFF format. */
766 struct coffscn *tp, *dp, *bp;
767 tp = &coffheader.scns[0];
768 dp = &coffheader.scns[1];
769 bp = &coffheader.scns[2];
770 tp->s_size = hdr.a_text + sizeof(struct exec);
771 dp->s_paddr = data_start;
772 dp->s_vaddr = data_start;
773 dp->s_size = hdr.a_data;
774 bp->s_paddr = dp->s_vaddr + dp->s_size;
775 bp->s_vaddr = bp->s_paddr;
776 bp->s_size = hdr.a_bss;
777 coffheader.tsize = tp->s_size;
778 coffheader.dsize = dp->s_size;
779 coffheader.bsize = bp->s_size;
780 coffheader.text_start = tp->s_vaddr;
781 coffheader.data_start = dp->s_vaddr;
783 if (write (new, &coffheader, sizeof coffheader) != sizeof coffheader)
785 PERROR(new_name);
787 #endif /* COFF_ENCAPSULATE */
789 if (write (new, &hdr, sizeof hdr) != sizeof hdr)
791 PERROR (new_name);
794 #if 0 /* This #ifndef caused a bug on Linux when using QMAGIC. */
795 /* This adjustment was done above only #ifndef NO_REMAP,
796 so only undo it now #ifndef NO_REMAP. */
797 /* #ifndef NO_REMAP */
798 #endif
799 #ifdef A_TEXT_OFFSET
800 hdr.a_text -= A_TEXT_OFFSET (ohdr);
801 #endif
803 return 0;
805 #endif /* not COFF */
808 /* ****************************************************************
809 * copy_text_and_data
811 * Copy the text and data segments from memory to the new a.out
813 static int
814 copy_text_and_data (new, a_out)
815 int new, a_out;
817 register char *end;
818 register char *ptr;
820 #ifdef COFF
822 #ifdef USG_SHARED_LIBRARIES
824 int scns;
825 struct scnhdr scntemp; /* Temporary section header */
827 /* The purpose of this code is to write out the new file's section
828 * contents.
830 * Step through the section table. If we know the section (.text,
831 * .data) do the appropriate thing. Otherwise, if the section has
832 * no allocated space in the file (.bss), do nothing. Otherwise,
833 * the section has space allocated in the file, and is not a section
834 * we know. So just copy it.
837 lseek (a_out, sizeof (struct filehdr) + sizeof (struct aouthdr), 0);
839 for (scns = f_hdr.f_nscns; scns > 0; scns--)
841 if (read (a_out, &scntemp, sizeof (scntemp)) != sizeof (scntemp))
842 PERROR ("temacs");
844 if (!strcmp (scntemp.s_name, ".text"))
846 lseek (new, (long) text_scnptr, 0);
847 ptr = (char *) f_ohdr.text_start;
848 end = ptr + f_ohdr.tsize;
849 write_segment (new, ptr, end);
851 else if (!strcmp (scntemp.s_name, ".data"))
853 lseek (new, (long) data_scnptr, 0);
854 ptr = (char *) f_ohdr.data_start;
855 end = ptr + f_ohdr.dsize;
856 write_segment (new, ptr, end);
858 else if (!scntemp.s_scnptr)
859 ; /* do nothing - no data for this section */
860 else
862 char page[BUFSIZ];
863 int size, n;
864 long old_a_out_ptr = lseek (a_out, 0, 1);
866 lseek (a_out, scntemp.s_scnptr, 0);
867 for (size = scntemp.s_size; size > 0; size -= sizeof (page))
869 n = size > sizeof (page) ? sizeof (page) : size;
870 if (read (a_out, page, n) != n || write (new, page, n) != n)
871 PERROR ("emacs");
873 lseek (a_out, old_a_out_ptr, 0);
877 #else /* COFF, but not USG_SHARED_LIBRARIES */
879 lseek (new, (long) text_scnptr, 0);
880 ptr = (char *) f_ohdr.text_start;
881 #ifdef HEADER_INCL_IN_TEXT
882 /* For Gould UTX/32, text starts after headers */
883 ptr = (char *) (ptr + text_scnptr);
884 #endif /* HEADER_INCL_IN_TEXT */
885 end = ptr + f_ohdr.tsize;
886 write_segment (new, ptr, end);
888 lseek (new, (long) data_scnptr, 0);
889 ptr = (char *) f_ohdr.data_start;
890 end = ptr + f_ohdr.dsize;
891 write_segment (new, ptr, end);
893 #endif /* USG_SHARED_LIBRARIES */
895 #else /* if not COFF */
897 /* Some machines count the header as part of the text segment.
898 That is to say, the header appears in core
899 just before the address that start_of_text returns.
900 For them, N_TXTOFF is the place where the header goes.
901 We must adjust the seek to the place after the header.
902 Note that at this point hdr.a_text does *not* count
903 the extra A_TEXT_OFFSET bytes, only the actual bytes of code. */
905 #ifdef A_TEXT_SEEK
906 lseek (new, (long) A_TEXT_SEEK (hdr), 0);
907 #else
908 lseek (new, (long) N_TXTOFF (hdr), 0);
909 #endif /* no A_TEXT_SEEK */
911 #ifdef RISCiX
913 /* Acorn's RISC-iX has a wacky way of initialising the position of the heap.
914 * There is a little table in crt0.o that is filled at link time with
915 * the min and current brk positions, among other things. When start
916 * runs, it copies the table to where these parameters live during
917 * execution. This data is in text space, so it cannot be modified here
918 * before saving the executable, so the data is written manually. In
919 * addition, the table does not have a label, and the nearest accessible
920 * label (mcount) is not prefixed with a '_', thus making it inaccessible
921 * from within C programs. To overcome this, emacs's executable is passed
922 * through the command 'nm %s | fgrep mcount' into a pipe, and the
923 * resultant output is then used to find the address of 'mcount'. As far as
924 * is possible to determine, in RISC-iX releases prior to 1.2, the negative
925 * offset of the table from mcount is 0x2c, whereas from 1.2 onwards it is
926 * 0x30. bss_end has been rounded up to page boundary. This solution is
927 * based on suggestions made by Kevin Welton and Steve Hunt of Acorn, and
928 * avoids the need for a custom version of crt0.o for emacs which has its
929 * table in data space.
933 char command[1024];
934 char errbuf[1024];
935 char address_text[32];
936 int proforma[4];
937 FILE *pfile;
938 char *temp_ptr;
939 char c;
940 int mcount_address, mcount_offset, count;
941 extern char *_execname;
944 /* The use of _execname is incompatible with RISCiX 1.1 */
945 sprintf (command, "nm %s | fgrep mcount", _execname);
947 if ( (pfile = popen(command, "r")) == NULL)
949 sprintf (errbuf, "Could not open pipe");
950 PERROR (errbuf);
953 count=0;
954 while ( ((c=getc(pfile)) != EOF) && (c != ' ') && (count < 31))
955 address_text[count++]=c;
956 address_text[count]=0;
958 if ((count == 0) || pclose(pfile) != NULL)
960 sprintf (errbuf, "Failed to execute the command '%s'\n", command);
961 PERROR (errbuf);
964 sscanf(address_text, "%x", &mcount_address);
965 ptr = (char *) unexec_text_start;
966 mcount_offset = (char *)mcount_address - ptr;
968 #ifdef RISCiX_1_1
969 #define EDATA_OFFSET 0x2c
970 #else
971 #define EDATA_OFFSET 0x30
972 #endif
974 end = ptr + mcount_offset - EDATA_OFFSET;
976 write_segment (new, ptr, end);
978 proforma[0] = bss_end; /* becomes _edata */
979 proforma[1] = bss_end; /* becomes _end */
980 proforma[2] = bss_end; /* becomes _minbrk */
981 proforma[3] = bss_end; /* becomes _curbrk */
983 write (new, proforma, 16);
985 temp_ptr = ptr;
986 ptr = end + 16;
987 end = temp_ptr + hdr.a_text;
989 write_segment (new, ptr, end);
992 #else /* !RISCiX */
993 ptr = (char *) unexec_text_start;
994 end = ptr + hdr.a_text;
995 write_segment (new, ptr, end);
996 #endif /* RISCiX */
998 ptr = (char *) unexec_data_start;
999 end = ptr + hdr.a_data;
1000 /* This lseek is certainly incorrect when A_TEXT_OFFSET
1001 and I believe it is a no-op otherwise.
1002 Let's see if its absence ever fails. */
1003 /* lseek (new, (long) N_TXTOFF (hdr) + hdr.a_text, 0); */
1004 write_segment (new, ptr, end);
1006 #endif /* not COFF */
1008 return 0;
1011 write_segment (new, ptr, end)
1012 int new;
1013 register char *ptr, *end;
1015 register int i, nwrite, ret;
1016 char buf[80];
1017 extern int errno;
1018 /* This is the normal amount to write at once.
1019 It is the size of block that NFS uses. */
1020 int writesize = 1 << 13;
1021 int pagesize = getpagesize ();
1022 char zeros[1 << 13];
1024 bzero (zeros, sizeof (zeros));
1026 for (i = 0; ptr < end;)
1028 /* Distance to next multiple of writesize. */
1029 nwrite = (((int) ptr + writesize) & -writesize) - (int) ptr;
1030 /* But not beyond specified end. */
1031 if (nwrite > end - ptr) nwrite = end - ptr;
1032 ret = write (new, ptr, nwrite);
1033 /* If write gets a page fault, it means we reached
1034 a gap between the old text segment and the old data segment.
1035 This gap has probably been remapped into part of the text segment.
1036 So write zeros for it. */
1037 if (ret == -1
1038 #ifdef EFAULT
1039 && errno == EFAULT
1040 #endif
1043 /* Write only a page of zeros at once,
1044 so that we we don't overshoot the start
1045 of the valid memory in the old data segment. */
1046 if (nwrite > pagesize)
1047 nwrite = pagesize;
1048 write (new, zeros, nwrite);
1050 #if 0 /* Now that we have can ask `write' to write more than a page,
1051 it is legit for write do less than the whole amount specified. */
1052 else if (nwrite != ret)
1054 sprintf (buf,
1055 "unexec write failure: addr 0x%x, fileno %d, size 0x%x, wrote 0x%x, errno %d",
1056 ptr, new, nwrite, ret, errno);
1057 PERROR (buf);
1059 #endif
1060 i += nwrite;
1061 ptr += nwrite;
1065 /* ****************************************************************
1066 * copy_sym
1068 * Copy the relocation information and symbol table from the a.out to the new
1070 static int
1071 copy_sym (new, a_out, a_name, new_name)
1072 int new, a_out;
1073 char *a_name, *new_name;
1075 char page[1024];
1076 int n;
1078 if (a_out < 0)
1079 return 0;
1081 #ifdef COFF
1082 if (SYMS_START == 0L)
1083 return 0;
1084 #endif /* COFF */
1086 #ifdef COFF
1087 if (lnnoptr) /* if there is line number info */
1088 lseek (a_out, lnnoptr, 0); /* start copying from there */
1089 else
1090 #endif /* COFF */
1091 lseek (a_out, SYMS_START, 0); /* Position a.out to symtab. */
1093 while ((n = read (a_out, page, sizeof page)) > 0)
1095 if (write (new, page, n) != n)
1097 PERROR (new_name);
1100 if (n < 0)
1102 PERROR (a_name);
1104 return 0;
1107 /* ****************************************************************
1108 * mark_x
1110 * After successfully building the new a.out, mark it executable
1112 static void
1113 mark_x (name)
1114 char *name;
1116 struct stat sbuf;
1117 int um;
1118 int new = 0; /* for PERROR */
1120 um = umask (777);
1121 umask (um);
1122 if (stat (name, &sbuf) == -1)
1124 PERROR (name);
1126 sbuf.st_mode |= 0111 & ~um;
1127 if (chmod (name, sbuf.st_mode) == -1)
1128 PERROR (name);
1131 #ifdef COFF
1132 #ifndef COFF_BSD_SYMBOLS
1135 * If the COFF file contains a symbol table and a line number section,
1136 * then any auxiliary entries that have values for x_lnnoptr must
1137 * be adjusted by the amount that the line number section has moved
1138 * in the file (bias computed in make_hdr). The #@$%&* designers of
1139 * the auxiliary entry structures used the absolute file offsets for
1140 * the line number entry rather than an offset from the start of the
1141 * line number section!
1143 * When I figure out how to scan through the symbol table and pick out
1144 * the auxiliary entries that need adjustment, this routine will
1145 * be fixed. As it is now, all such entries are wrong and sdb
1146 * will complain. Fred Fish, UniSoft Systems Inc.
1149 /* This function is probably very slow. Instead of reopening the new
1150 file for input and output it should copy from the old to the new
1151 using the two descriptors already open (WRITEDESC and READDESC).
1152 Instead of reading one small structure at a time it should use
1153 a reasonable size buffer. But I don't have time to work on such
1154 things, so I am installing it as submitted to me. -- RMS. */
1156 adjust_lnnoptrs (writedesc, readdesc, new_name)
1157 int writedesc;
1158 int readdesc;
1159 char *new_name;
1161 register int nsyms;
1162 register int new;
1163 #if defined (amdahl_uts) || defined (pfa)
1164 SYMENT symentry;
1165 AUXENT auxentry;
1166 #else
1167 struct syment symentry;
1168 union auxent auxentry;
1169 #endif
1171 if (!lnnoptr || !f_hdr.f_symptr)
1172 return 0;
1174 #ifdef MSDOS
1175 if ((new = writedesc) < 0)
1176 #else
1177 if ((new = open (new_name, O_RDWR)) < 0)
1178 #endif
1180 PERROR (new_name);
1181 return -1;
1184 lseek (new, f_hdr.f_symptr, 0);
1185 for (nsyms = 0; nsyms < f_hdr.f_nsyms; nsyms++)
1187 read (new, &symentry, SYMESZ);
1188 if (symentry.n_numaux)
1190 read (new, &auxentry, AUXESZ);
1191 nsyms++;
1192 if (ISFCN (symentry.n_type) || symentry.n_type == 0x2400)
1194 auxentry.x_sym.x_fcnary.x_fcn.x_lnnoptr += bias;
1195 lseek (new, -AUXESZ, 1);
1196 write (new, &auxentry, AUXESZ);
1200 #ifndef MSDOS
1201 close (new);
1202 #endif
1203 return 0;
1206 #endif /* COFF_BSD_SYMBOLS */
1208 #endif /* COFF */
1210 #endif /* not CANNOT_DUMP */