1 /* Copyright (C) 1985, 1986, 1987, 1988, 1992 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 1, or (at your option)
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, 675 Mass Ave, Cambridge, MA 02139, USA. */
21 * unexec.c - Convert a running program into an a.out file.
23 * Author: Spencer W. Thomas
24 * Computer Science Dept.
26 * Date: Tue Mar 2 1982
27 * Modified heavily since then.
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;
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.
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.
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.
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.
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
61 * The new file is set up to start at entry_address.
63 * If you make improvements I'd like to get them too.
64 * harpo!utah-cs!thomas, thomas@Utah-20
68 /* Modified to support SysVr3 shared libraries by James Van Artsdalen
69 * of Dell Computer Corporation. james@bigtex.cactus.org.
72 /* There are several compilation parameters affecting unexec:
76 Define this if your system uses COFF for executables.
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
84 Otherwise we assume you use Berkeley format.
88 Define this if you do not want to try to save Emacs's pure data areas
89 as part of the text segment.
91 Saving them as text is good because it allows users to share more.
93 However, on machines that locate the text area far from the data area,
94 the boundary cannot feasibly be moved. Such machines require
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.
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.
111 If SECTION_ALIGNMENT is not defined, the segments are written
112 consecutively with no attempt at alignment. This is right for
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.
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.
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.
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
144 For machines using COFF, this macro, if defined, is a value stored
145 into the magic number field of the output file.
149 This macro can be used to generate statements to adjust or
150 initialize nonstandard fields in the file header
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.
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.
164 #define PERROR(arg) perror (arg); return -1
168 #define PERROR(file) report_error (file, new)
171 #ifndef CANNOT_DUMP /* all rest of file! */
173 #ifndef CANNOT_UNEXEC /* most of rest of file */
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 */
182 /* Define getpagesize () if the system does not.
183 Note that this may depend on symbols defined in a.out.h
185 #include "getpagesize.h"
187 #ifndef makedev /* Try to detect types.h already loaded */
188 #include <sys/types.h>
191 #include <sys/stat.h>
194 extern char *start_of_text (); /* Start of text */
195 extern char *start_of_data (); /* Start of initialized data */
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
205 static long text_scnptr
;
206 static long data_scnptr
;
211 extern void *sbrk ();
213 extern char *sbrk ();
216 #define SYMS_START ((long) N_SYMOFF (ohdr))
218 /* Some machines override the structure name for an a.out header. */
219 #ifndef EXEC_HDR_TYPE
220 #define EXEC_HDR_TYPE struct exec
225 #define MY_ID HP9000S200_ID
229 #endif /* no HP9000S200_ID */
230 static MAGIC OLDMAGIC
= {MY_ID
, SHARE_MAGIC
};
231 static MAGIC NEWMAGIC
= {MY_ID
, DEMAND_MAGIC
};
232 #define N_TXTOFF(x) TEXT_OFFSET(x)
233 #define N_SYMOFF(x) LESYM_OFFSET(x)
234 static EXEC_HDR_TYPE hdr
, ohdr
;
238 #if defined (USG) && !defined (IBMAIX) && !defined (IRIS) && !defined (COFF_ENCAPSULATE) && !defined (LINUX)
239 static struct bhdr hdr
, ohdr
;
240 #define a_magic fmagic
245 #define a_trsize rtsize
246 #define a_drsize rdsize
247 #define a_entry entry
248 #define N_BADMAG(x) \
249 (((x).fmagic)!=OMAGIC && ((x).fmagic)!=NMAGIC &&\
250 ((x).fmagic)!=FMAGIC && ((x).fmagic)!=IMAGIC)
251 #define NEWMAGIC FMAGIC
252 #else /* IRIS or IBMAIX or not USG */
253 static EXEC_HDR_TYPE hdr
, ohdr
;
254 #define NEWMAGIC ZMAGIC
255 #endif /* IRIS or IBMAIX not USG */
256 #endif /* not HPUX */
258 static int unexec_text_start
;
259 static int unexec_data_start
;
261 #ifdef COFF_ENCAPSULATE
262 /* coffheader is defined in the GNU a.out.encap.h file. */
263 struct coffheader coffheader
;
266 #endif /* not COFF */
270 /* Correct an int which is the bit pattern of a pointer to a byte
271 into an int which is the number of a byte.
272 This is a no-op on ordinary machines, but not on all. */
274 #ifndef ADDR_CORRECT /* Let m-*.h files override this definition */
275 #define ADDR_CORRECT(x) ((char *)(x) - (char*)0)
281 report_error (file
, fd
)
287 error ("Failure operating on %s\n", file
);
291 #define ERROR0(msg) report_error_1 (new, msg, 0, 0); return -1
292 #define ERROR1(msg,x) report_error_1 (new, msg, x, 0); return -1
293 #define ERROR2(msg,x,y) report_error_1 (new, msg, x, y); return -1
296 report_error_1 (fd
, msg
, a1
, a2
)
305 fprintf (stderr
, msg
, a1
, a2
);
306 fprintf (stderr
, "\n");
310 static int make_hdr ();
311 static int copy_text_and_data ();
312 static int copy_sym ();
313 static void mark_x ();
315 /* ****************************************************************
320 unexec (new_name
, a_name
, data_start
, bss_start
, entry_address
)
321 char *new_name
, *a_name
;
322 unsigned data_start
, bss_start
, entry_address
;
326 if (a_name
&& (a_out
= open (a_name
, 0)) < 0)
330 if ((new = creat (new_name
, 0666)) < 0)
335 if (make_hdr (new, a_out
, data_start
, bss_start
, entry_address
, a_name
, new_name
) < 0
336 || copy_text_and_data (new, a_out
) < 0
337 || copy_sym (new, a_out
, a_name
, new_name
) < 0
339 #ifndef COFF_BSD_SYMBOLS
340 || adjust_lnnoptrs (new, a_out
, new_name
) < 0
346 /* unlink (new_name); /* Failed, unlink new a.out */
357 /* ****************************************************************
360 * Make the header in the new a.out from the header in core.
361 * Modify the text and data sizes.
364 make_hdr (new, a_out
, data_start
, bss_start
, entry_address
, a_name
, new_name
)
366 unsigned data_start
, bss_start
, entry_address
;
372 auto struct scnhdr f_thdr
; /* Text section header */
373 auto struct scnhdr f_dhdr
; /* Data section header */
374 auto struct scnhdr f_bhdr
; /* Bss section header */
375 auto struct scnhdr scntemp
; /* Temporary section header */
378 #ifdef USG_SHARED_LIBRARIES
379 extern unsigned int bss_end
;
381 unsigned int bss_end
;
384 pagemask
= getpagesize () - 1;
386 /* Adjust text/data boundary. */
388 data_start
= (int) start_of_data ();
389 #else /* not NO_REMAP */
391 data_start
= (int) start_of_data ();
392 #endif /* not NO_REMAP */
393 data_start
= ADDR_CORRECT (data_start
);
396 data_start
= data_start
& ~SEGMENT_MASK
; /* (Down) to segment boundary. */
398 data_start
= data_start
& ~pagemask
; /* (Down) to page boundary. */
401 bss_end
= ADDR_CORRECT (sbrk (0)) + pagemask
;
402 bss_end
&= ~ pagemask
;
404 /* Adjust data/bss boundary. */
407 bss_start
= (ADDR_CORRECT (bss_start
) + pagemask
);
408 /* (Up) to page bdry. */
409 bss_start
&= ~ pagemask
;
410 if (bss_start
> bss_end
)
412 ERROR1 ("unexec: Specified bss_start (%u) is past end of program",
419 if (data_start
> bss_start
) /* Can't have negative data size. */
421 ERROR2 ("unexec: data_start (%u) can't be greater than bss_start (%u)",
422 data_start
, bss_start
);
426 /* Salvage as much info from the existing file as possible */
429 if (read (a_out
, &f_hdr
, sizeof (f_hdr
)) != sizeof (f_hdr
))
433 block_copy_start
+= sizeof (f_hdr
);
434 if (f_hdr
.f_opthdr
> 0)
436 if (read (a_out
, &f_ohdr
, sizeof (f_ohdr
)) != sizeof (f_ohdr
))
440 block_copy_start
+= sizeof (f_ohdr
);
442 /* Loop through section headers, copying them in */
443 for (scns
= f_hdr
.f_nscns
; scns
> 0; scns
--) {
444 if (read (a_out
, &scntemp
, sizeof (scntemp
)) != sizeof (scntemp
))
448 if (scntemp
.s_scnptr
> 0L)
450 if (block_copy_start
< scntemp
.s_scnptr
+ scntemp
.s_size
)
451 block_copy_start
= scntemp
.s_scnptr
+ scntemp
.s_size
;
453 if (strcmp (scntemp
.s_name
, ".text") == 0)
457 else if (strcmp (scntemp
.s_name
, ".data") == 0)
461 else if (strcmp (scntemp
.s_name
, ".bss") == 0)
469 ERROR0 ("can't build a COFF file from scratch yet");
472 /* Now we alter the contents of all the f_*hdr variables
473 to correspond to what we want to dump. */
475 #ifdef USG_SHARED_LIBRARIES
477 /* The amount of data we're adding to the file is distance from the
478 * end of the original .data space to the current end of the .data
482 bias
= bss_start
- (f_ohdr
.data_start
+ f_dhdr
.s_size
);
486 f_hdr
.f_flags
|= (F_RELFLG
| F_EXEC
);
491 f_ohdr
.magic
= EXEC_MAGIC
;
494 f_ohdr
.text_start
= (long) start_of_text ();
495 f_ohdr
.tsize
= data_start
- f_ohdr
.text_start
;
496 f_ohdr
.data_start
= data_start
;
497 #endif /* NO_REMAP */
498 f_ohdr
.dsize
= bss_start
- f_ohdr
.data_start
;
499 f_ohdr
.bsize
= bss_end
- bss_start
;
500 #ifndef KEEP_OLD_TEXT_SCNPTR
501 /* On some machines, the old values are right.
502 ??? Maybe on all machines with NO_REMAP. */
503 f_thdr
.s_size
= f_ohdr
.tsize
;
504 f_thdr
.s_scnptr
= sizeof (f_hdr
) + sizeof (f_ohdr
);
505 f_thdr
.s_scnptr
+= (f_hdr
.f_nscns
) * (sizeof (f_thdr
));
506 #endif /* KEEP_OLD_TEXT_SCNPTR */
507 #ifdef ADJUST_TEXT_SCNHDR_SIZE
508 /* On some machines, `text size' includes all headers. */
509 f_thdr
.s_size
-= f_thdr
.s_scnptr
;
510 #endif /* ADJUST_TEST_SCNHDR_SIZE */
511 lnnoptr
= f_thdr
.s_lnnoptr
;
512 #ifdef SECTION_ALIGNMENT
513 /* Some systems require special alignment
514 of the sections in the file itself. */
516 = (f_thdr
.s_scnptr
+ SECTION_ALIGNMENT
) & ~SECTION_ALIGNMENT
;
517 #endif /* SECTION_ALIGNMENT */
519 f_thdr
.s_scnptr
= 0xd0;
521 text_scnptr
= f_thdr
.s_scnptr
;
522 #ifdef ADJUST_TEXTBASE
523 text_scnptr
= sizeof (f_hdr
) + sizeof (f_ohdr
) + (f_hdr
.f_nscns
) * (sizeof (f_thdr
));
525 #ifndef KEEP_OLD_PADDR
526 f_dhdr
.s_paddr
= f_ohdr
.data_start
;
527 #endif /* KEEP_OLD_PADDR */
528 f_dhdr
.s_vaddr
= f_ohdr
.data_start
;
529 f_dhdr
.s_size
= f_ohdr
.dsize
;
530 f_dhdr
.s_scnptr
= f_thdr
.s_scnptr
+ f_thdr
.s_size
;
531 #ifdef SECTION_ALIGNMENT
532 /* Some systems require special alignment
533 of the sections in the file itself. */
535 = (f_dhdr
.s_scnptr
+ SECTION_ALIGNMENT
) & ~SECTION_ALIGNMENT
;
536 #endif /* SECTION_ALIGNMENT */
537 #ifdef DATA_SECTION_ALIGNMENT
538 /* Some systems require special alignment
539 of the data section only. */
541 = (f_dhdr
.s_scnptr
+ DATA_SECTION_ALIGNMENT
) & ~DATA_SECTION_ALIGNMENT
;
542 #endif /* DATA_SECTION_ALIGNMENT */
543 data_scnptr
= f_dhdr
.s_scnptr
;
544 #ifndef KEEP_OLD_PADDR
545 f_bhdr
.s_paddr
= f_ohdr
.data_start
+ f_ohdr
.dsize
;
546 #endif /* KEEP_OLD_PADDR */
547 f_bhdr
.s_vaddr
= f_ohdr
.data_start
+ f_ohdr
.dsize
;
548 f_bhdr
.s_size
= f_ohdr
.bsize
;
549 f_bhdr
.s_scnptr
= 0L;
550 #ifndef USG_SHARED_LIBRARIES
551 bias
= f_dhdr
.s_scnptr
+ f_dhdr
.s_size
- block_copy_start
;
554 if (f_hdr
.f_symptr
> 0L)
556 f_hdr
.f_symptr
+= bias
;
559 if (f_thdr
.s_lnnoptr
> 0L)
561 f_thdr
.s_lnnoptr
+= bias
;
564 #ifdef ADJUST_EXEC_HEADER
566 #endif /* ADJUST_EXEC_HEADER */
568 if (write (new, &f_hdr
, sizeof (f_hdr
)) != sizeof (f_hdr
))
573 if (write (new, &f_ohdr
, sizeof (f_ohdr
)) != sizeof (f_ohdr
))
578 #ifndef USG_SHARED_LIBRARIES
580 if (write (new, &f_thdr
, sizeof (f_thdr
)) != sizeof (f_thdr
))
585 if (write (new, &f_dhdr
, sizeof (f_dhdr
)) != sizeof (f_dhdr
))
590 if (write (new, &f_bhdr
, sizeof (f_bhdr
)) != sizeof (f_bhdr
))
595 #else /* USG_SHARED_LIBRARIES */
597 /* The purpose of this code is to write out the new file's section
600 * Scan through the original file's sections. If the encountered
601 * section is one we know (.text, .data or .bss), write out the
602 * correct header. If it is a section we do not know (such as
603 * .lib), adjust the address of where the section data is in the
604 * file, and write out the header.
606 * If any section preceeds .text or .data in the file, this code
607 * will not adjust the file pointer for that section correctly.
610 lseek (a_out
, sizeof (f_hdr
) + sizeof (f_ohdr
), 0);
612 for (scns
= f_hdr
.f_nscns
; scns
> 0; scns
--)
614 if (read (a_out
, &scntemp
, sizeof (scntemp
)) != sizeof (scntemp
))
617 if (!strcmp (scntemp
.s_name
, f_thdr
.s_name
)) /* .text */
619 if (write (new, &f_thdr
, sizeof (f_thdr
)) != sizeof (f_thdr
))
622 else if (!strcmp (scntemp
.s_name
, f_dhdr
.s_name
)) /* .data */
624 if (write (new, &f_dhdr
, sizeof (f_dhdr
)) != sizeof (f_dhdr
))
627 else if (!strcmp (scntemp
.s_name
, f_bhdr
.s_name
)) /* .bss */
629 if (write (new, &f_bhdr
, sizeof (f_bhdr
)) != sizeof (f_bhdr
))
634 if (scntemp
.s_scnptr
)
635 scntemp
.s_scnptr
+= bias
;
636 if (write (new, &scntemp
, sizeof (scntemp
)) != sizeof (scntemp
))
640 #endif /* USG_SHARED_LIBRARIES */
644 #else /* if not COFF */
646 /* Get symbol table info from header of a.out file if given one. */
649 #ifdef COFF_ENCAPSULATE
650 if (read (a_out
, &coffheader
, sizeof coffheader
) != sizeof coffheader
)
654 if (coffheader
.f_magic
!= COFF_MAGIC
)
656 ERROR1("%s doesn't have legal coff magic number\n", a_name
);
659 if (read (a_out
, &ohdr
, sizeof hdr
) != sizeof hdr
)
666 ERROR1 ("invalid magic number in %s", a_name
);
672 #ifdef COFF_ENCAPSULATE
673 /* We probably could without too much trouble. The code is in gld
674 * but I don't have that much time or incentive.
676 ERROR0 ("can't build a COFF file from scratch yet");
678 bzero (hdr
, sizeof hdr
);
682 unexec_text_start
= (long) start_of_text ();
683 unexec_data_start
= data_start
;
685 /* Machine-dependent fixup for header, or maybe for unexec_text_start */
686 #ifdef ADJUST_EXEC_HEADER
688 #endif /* ADJUST_EXEC_HEADER */
692 if (entry_address
!= 0)
693 hdr
.a_entry
= entry_address
;
695 hdr
.a_bss
= bss_end
- bss_start
;
696 hdr
.a_data
= bss_start
- data_start
;
698 hdr
.a_text
= ohdr
.a_text
;
699 #else /* not NO_REMAP */
700 hdr
.a_text
= data_start
- unexec_text_start
;
703 hdr
.a_text
+= A_TEXT_OFFSET (ohdr
);
706 #endif /* not NO_REMAP */
708 #ifdef COFF_ENCAPSULATE
709 /* We are encapsulating BSD format within COFF format. */
711 struct coffscn
*tp
, *dp
, *bp
;
712 tp
= &coffheader
.scns
[0];
713 dp
= &coffheader
.scns
[1];
714 bp
= &coffheader
.scns
[2];
715 tp
->s_size
= hdr
.a_text
+ sizeof(struct exec
);
716 dp
->s_paddr
= data_start
;
717 dp
->s_vaddr
= data_start
;
718 dp
->s_size
= hdr
.a_data
;
719 bp
->s_paddr
= dp
->s_vaddr
+ dp
->s_size
;
720 bp
->s_vaddr
= bp
->s_paddr
;
721 bp
->s_size
= hdr
.a_bss
;
722 coffheader
.tsize
= tp
->s_size
;
723 coffheader
.dsize
= dp
->s_size
;
724 coffheader
.bsize
= bp
->s_size
;
725 coffheader
.text_start
= tp
->s_vaddr
;
726 coffheader
.data_start
= dp
->s_vaddr
;
728 if (write (new, &coffheader
, sizeof coffheader
) != sizeof coffheader
)
732 #endif /* COFF_ENCAPSULATE */
734 if (write (new, &hdr
, sizeof hdr
) != sizeof hdr
)
740 hdr
.a_text
-= A_TEXT_OFFSET (ohdr
);
745 #endif /* not COFF */
748 /* ****************************************************************
751 * Copy the text and data segments from memory to the new a.out
754 copy_text_and_data (new, a_out
)
762 #ifdef USG_SHARED_LIBRARIES
765 struct scnhdr scntemp
; /* Temporary section header */
767 /* The purpose of this code is to write out the new file's section
770 * Step through the section table. If we know the section (.text,
771 * .data) do the appropriate thing. Otherwise, if the section has
772 * no allocated space in the file (.bss), do nothing. Otherwise,
773 * the section has space allocated in the file, and is not a section
774 * we know. So just copy it.
777 lseek (a_out
, sizeof (struct filehdr
) + sizeof (struct aouthdr
), 0);
779 for (scns
= f_hdr
.f_nscns
; scns
> 0; scns
--)
781 if (read (a_out
, &scntemp
, sizeof (scntemp
)) != sizeof (scntemp
))
784 if (!strcmp (scntemp
.s_name
, ".text"))
786 lseek (new, (long) text_scnptr
, 0);
787 ptr
= (char *) f_ohdr
.text_start
;
788 end
= ptr
+ f_ohdr
.tsize
;
789 write_segment (new, ptr
, end
);
791 else if (!strcmp (scntemp
.s_name
, ".data"))
793 lseek (new, (long) data_scnptr
, 0);
794 ptr
= (char *) f_ohdr
.data_start
;
795 end
= ptr
+ f_ohdr
.dsize
;
796 write_segment (new, ptr
, end
);
798 else if (!scntemp
.s_scnptr
)
799 ; /* do nothing - no data for this section */
804 long old_a_out_ptr
= lseek (a_out
, 0, 1);
806 lseek (a_out
, scntemp
.s_scnptr
, 0);
807 for (size
= scntemp
.s_size
; size
> 0; size
-= sizeof (page
))
809 n
= size
> sizeof (page
) ? sizeof (page
) : size
;
810 if (read (a_out
, page
, n
) != n
|| write (new, page
, n
) != n
)
813 lseek (a_out
, old_a_out_ptr
, 0);
817 #else /* COFF, but not USG_SHARED_LIBRARIES */
819 lseek (new, (long) text_scnptr
, 0);
820 ptr
= (char *) f_ohdr
.text_start
;
821 #ifdef HEADER_INCL_IN_TEXT
822 /* For Gould UTX/32, text starts after headers */
823 ptr
= (char *) (ptr
+ text_scnptr
);
824 #endif /* HEADER_INCL_IN_TEXT */
825 end
= ptr
+ f_ohdr
.tsize
;
826 write_segment (new, ptr
, end
);
828 lseek (new, (long) data_scnptr
, 0);
829 ptr
= (char *) f_ohdr
.data_start
;
830 end
= ptr
+ f_ohdr
.dsize
;
831 write_segment (new, ptr
, end
);
833 #endif /* USG_SHARED_LIBRARIES */
835 #else /* if not COFF */
837 /* Some machines count the header as part of the text segment.
838 That is to say, the header appears in core
839 just before the address that start_of_text () returns.
840 For them, N_TXTOFF is the place where the header goes.
841 We must adjust the seek to the place after the header.
842 Note that at this point hdr.a_text does *not* count
843 the extra A_TEXT_OFFSET bytes, only the actual bytes of code. */
846 lseek (new, (long) A_TEXT_SEEK (hdr
), 0);
848 lseek (new, (long) N_TXTOFF (hdr
), 0);
849 #endif /* no A_TEXT_SEEK */
851 ptr
= (char *) unexec_text_start
;
852 end
= ptr
+ hdr
.a_text
;
853 write_segment (new, ptr
, end
);
855 ptr
= (char *) unexec_data_start
;
856 end
= ptr
+ hdr
.a_data
;
857 /* This lseek is certainly incorrect when A_TEXT_OFFSET
858 and I believe it is a no-op otherwise.
859 Let's see if its absence ever fails. */
860 /* lseek (new, (long) N_TXTOFF (hdr) + hdr.a_text, 0); */
861 write_segment (new, ptr
, end
);
863 #endif /* not COFF */
868 write_segment (new, ptr
, end
)
870 register char *ptr
, *end
;
872 register int i
, nwrite
, ret
;
877 bzero (zeros
, sizeof zeros
);
879 for (i
= 0; ptr
< end
;)
881 /* distance to next multiple of 128. */
882 nwrite
= (((int) ptr
+ 128) & -128) - (int) ptr
;
883 /* But not beyond specified end. */
884 if (nwrite
> end
- ptr
) nwrite
= end
- ptr
;
885 ret
= write (new, ptr
, nwrite
);
886 /* If write gets a page fault, it means we reached
887 a gap between the old text segment and the old data segment.
888 This gap has probably been remapped into part of the text segment.
889 So write zeros for it. */
890 if (ret
== -1 && errno
== EFAULT
)
891 write (new, zeros
, nwrite
);
892 else if (nwrite
!= ret
)
895 "unexec write failure: addr 0x%x, fileno %d, size 0x%x, wrote 0x%x, errno %d",
896 ptr
, new, nwrite
, ret
, errno
);
904 /* ****************************************************************
907 * Copy the relocation information and symbol table from the a.out to the new
910 copy_sym (new, a_out
, a_name
, new_name
)
912 char *a_name
, *new_name
;
921 if (SYMS_START
== 0L)
926 if (lnnoptr
) /* if there is line number info */
927 lseek (a_out
, lnnoptr
, 0); /* start copying from there */
930 lseek (a_out
, SYMS_START
, 0); /* Position a.out to symtab. */
932 while ((n
= read (a_out
, page
, sizeof page
)) > 0)
934 if (write (new, page
, n
) != n
)
946 /* ****************************************************************
949 * After succesfully building the new a.out, mark it executable
957 int new = 0; /* for PERROR */
961 if (stat (name
, &sbuf
) == -1)
965 sbuf
.st_mode
|= 0111 & ~um
;
966 if (chmod (name
, sbuf
.st_mode
) == -1)
971 #ifndef COFF_BSD_SYMBOLS
974 * If the COFF file contains a symbol table and a line number section,
975 * then any auxiliary entries that have values for x_lnnoptr must
976 * be adjusted by the amount that the line number section has moved
977 * in the file (bias computed in make_hdr). The #@$%&* designers of
978 * the auxiliary entry structures used the absolute file offsets for
979 * the line number entry rather than an offset from the start of the
980 * line number section!
982 * When I figure out how to scan through the symbol table and pick out
983 * the auxiliary entries that need adjustment, this routine will
984 * be fixed. As it is now, all such entries are wrong and sdb
985 * will complain. Fred Fish, UniSoft Systems Inc.
988 /* This function is probably very slow. Instead of reopening the new
989 file for input and output it should copy from the old to the new
990 using the two descriptors already open (WRITEDESC and READDESC).
991 Instead of reading one small structure at a time it should use
992 a reasonable size buffer. But I don't have time to work on such
993 things, so I am installing it as submitted to me. -- RMS. */
995 adjust_lnnoptrs (writedesc
, readdesc
, new_name
)
1002 #if defined (amdahl_uts) || defined (pfa)
1006 struct syment symentry
;
1007 union auxent auxentry
;
1010 if (!lnnoptr
|| !f_hdr
.f_symptr
)
1013 if ((new = open (new_name
, 2)) < 0)
1019 lseek (new, f_hdr
.f_symptr
, 0);
1020 for (nsyms
= 0; nsyms
< f_hdr
.f_nsyms
; nsyms
++)
1022 read (new, &symentry
, SYMESZ
);
1023 if (symentry
.n_numaux
)
1025 read (new, &auxentry
, AUXESZ
);
1027 if (ISFCN (symentry
.n_type
) || symentry
.n_type
== 0x2400)
1029 auxentry
.x_sym
.x_fcnary
.x_fcn
.x_lnnoptr
+= bias
;
1030 lseek (new, -AUXESZ
, 1);
1031 write (new, &auxentry
, AUXESZ
);
1038 #endif /* COFF_BSD_SYMBOLS */
1042 #endif /* not CANNOT_UNEXEC */
1044 #endif /* not CANNOT_DUMP */