|
0
|
1 /* Copyright (C) 1985, 1986, 1987, 1988, 1992, 1993, 1994
|
|
|
2 Free Software Foundation, Inc.
|
|
|
3
|
|
|
4 This file is part of XEmacs.
|
|
|
5
|
|
|
6 XEmacs is free software; you can redistribute it and/or modify it
|
|
|
7 under the terms of the GNU General Public License as published by the
|
|
|
8 Free Software Foundation; either version 2, or (at your option) any
|
|
|
9 later version.
|
|
|
10
|
|
|
11 XEmacs is distributed in the hope that it will be useful, but WITHOUT
|
|
|
12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
|
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
|
|
14 for more details.
|
|
|
15
|
|
|
16 You should have received a copy of the GNU General Public License
|
|
|
17 along with XEmacs; see the file COPYING. If not, write to
|
|
|
18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
|
19 Boston, MA 02111-1307, USA. */
|
|
|
20
|
|
|
21 /* Synched up with: FSF 19.31. */
|
|
|
22
|
|
|
23 /*
|
|
|
24 * unexec.c - Convert a running program into an a.out file.
|
|
|
25 *
|
|
|
26 * Author: Spencer W. Thomas
|
|
|
27 * Computer Science Dept.
|
|
|
28 * University of Utah
|
|
|
29 * Date: Tue Mar 2 1982
|
|
|
30 * Modified heavily since then.
|
|
|
31 *
|
|
|
32 * Synopsis:
|
|
|
33 * unexec (new_name, a_name, data_start, bss_start, entry_address)
|
|
|
34 * char *new_name, *a_name;
|
|
|
35 * unsigned data_start, bss_start, entry_address;
|
|
|
36 *
|
|
|
37 * Takes a snapshot of the program and makes an a.out format file in the
|
|
|
38 * file named by the string argument new_name.
|
|
|
39 * If a_name is non-NULL, the symbol table will be taken from the given file.
|
|
|
40 * On some machines, an existing a_name file is required.
|
|
|
41 *
|
|
|
42 * The boundaries within the a.out file may be adjusted with the data_start
|
|
|
43 * and bss_start arguments. Either or both may be given as 0 for defaults.
|
|
|
44 *
|
|
|
45 * Data_start gives the boundary between the text segment and the data
|
|
|
46 * segment of the program. The text segment can contain shared, read-only
|
|
|
47 * program code and literal data, while the data segment is always unshared
|
|
|
48 * and unprotected. Data_start gives the lowest unprotected address.
|
|
|
49 * The value you specify may be rounded down to a suitable boundary
|
|
|
50 * as required by the machine you are using.
|
|
|
51 *
|
|
|
52 * Specifying zero for data_start means the boundary between text and data
|
|
|
53 * should not be the same as when the program was loaded.
|
|
|
54 * If NO_REMAP is defined, the argument data_start is ignored and the
|
|
|
55 * segment boundaries are never changed.
|
|
|
56 *
|
|
|
57 * Bss_start indicates how much of the data segment is to be saved in the
|
|
|
58 * a.out file and restored when the program is executed. It gives the lowest
|
|
|
59 * unsaved address, and is rounded up to a page boundary. The default when 0
|
|
|
60 * is given assumes that the entire data segment is to be stored, including
|
|
|
61 * the previous data and bss as well as any additional storage allocated with
|
|
|
62 * break (2).
|
|
|
63 *
|
|
|
64 * The new file is set up to start at entry_address.
|
|
|
65 *
|
|
|
66 * If you make improvements I'd like to get them too.
|
|
|
67 * harpo!utah-cs!thomas, thomas@Utah-20
|
|
|
68 *
|
|
|
69 */
|
|
|
70
|
|
|
71 /* Modified to support SysVr3 shared libraries by James Van Artsdalen
|
|
|
72 * of Dell Computer Corporation. james@bigtex.cactus.org.
|
|
|
73 */
|
|
|
74
|
|
|
75 /* There are several compilation parameters affecting unexec:
|
|
|
76
|
|
|
77 * COFF
|
|
|
78
|
|
|
79 Define this if your system uses COFF for executables.
|
|
|
80
|
|
|
81 * COFF_ENCAPSULATE
|
|
|
82
|
|
|
83 Define this if you are using the GNU coff encapsulated a.out format.
|
|
|
84 This is closer to a.out than COFF. You should *not* define COFF if
|
|
|
85 you define COFF_ENCAPSULATE
|
|
|
86
|
|
|
87 Otherwise we assume you use Berkeley format.
|
|
|
88
|
|
|
89 * NO_REMAP
|
|
|
90
|
|
|
91 Define this if you do not want to try to save Emacs's pure data areas
|
|
|
92 as part of the text segment.
|
|
|
93
|
|
|
94 Saving them as text is good because it allows users to share more.
|
|
|
95
|
|
|
96 However, on machines that locate the text area far from the data area,
|
|
|
97 the boundary cannot feasibly be moved. Such machines require
|
|
|
98 NO_REMAP.
|
|
|
99
|
|
|
100 Also, remapping can cause trouble with the built-in startup routine
|
|
|
101 /lib/crt0.o, which defines `environ' as an initialized variable.
|
|
|
102 Dumping `environ' as pure does not work! So, to use remapping,
|
|
|
103 you must write a startup routine for your machine in Emacs's crt0.c.
|
|
|
104 If NO_REMAP is defined, Emacs uses the system's crt0.o.
|
|
|
105
|
|
|
106 * SECTION_ALIGNMENT
|
|
|
107
|
|
|
108 Some machines that use COFF executables require that each section
|
|
|
109 start on a certain boundary *in the COFF file*. Such machines should
|
|
|
110 define SECTION_ALIGNMENT to a mask of the low-order bits that must be
|
|
|
111 zero on such a boundary. This mask is used to control padding between
|
|
|
112 segments in the COFF file.
|
|
|
113
|
|
|
114 If SECTION_ALIGNMENT is not defined, the segments are written
|
|
|
115 consecutively with no attempt at alignment. This is right for
|
|
|
116 unmodified system V.
|
|
|
117
|
|
|
118 * SEGMENT_MASK
|
|
|
119
|
|
|
120 Some machines require that the beginnings and ends of segments
|
|
|
121 *in core* be on certain boundaries. For most machines, a page
|
|
|
122 boundary is sufficient. That is the default. When a larger
|
|
|
123 boundary is needed, define SEGMENT_MASK to a mask of
|
|
|
124 the bits that must be zero on such a boundary.
|
|
|
125
|
|
|
126 * A_TEXT_OFFSET(HDR)
|
|
|
127
|
|
|
128 Some machines count the a.out header as part of the size of the text
|
|
|
129 segment (a_text); they may actually load the header into core as the
|
|
|
130 first data in the text segment. Some have additional padding between
|
|
|
131 the header and the real text of the program that is counted in a_text.
|
|
|
132
|
|
|
133 For these machines, define A_TEXT_OFFSET(HDR) to examine the header
|
|
|
134 structure HDR and return the number of bytes to add to `a_text'
|
|
|
135 before writing it (above and beyond the number of bytes of actual
|
|
|
136 program text). HDR's standard fields are already correct, except that
|
|
|
137 this adjustment to the `a_text' field has not yet been made;
|
|
|
138 thus, the amount of offset can depend on the data in the file.
|
|
|
139
|
|
|
140 * A_TEXT_SEEK(HDR)
|
|
|
141
|
|
|
142 If defined, this macro specifies the number of bytes to seek into the
|
|
|
143 a.out file before starting to write the text segment.
|
|
|
144
|
|
|
145 * EXEC_MAGIC
|
|
|
146
|
|
|
147 For machines using COFF, this macro, if defined, is a value stored
|
|
|
148 into the magic number field of the output file.
|
|
|
149
|
|
|
150 * ADJUST_EXEC_HEADER
|
|
|
151
|
|
|
152 This macro can be used to generate statements to adjust or
|
|
|
153 initialize nonstandard fields in the file header
|
|
|
154
|
|
|
155 * ADDR_CORRECT(ADDR)
|
|
|
156
|
|
|
157 Macro to correct an int which is the bit pattern of a pointer to a byte
|
|
|
158 into an int which is the number of a byte.
|
|
|
159
|
|
|
160 This macro has a default definition which is usually right.
|
|
|
161 This default definition is a no-op on most machines (where a
|
|
|
162 pointer looks like an int) but not on all machines.
|
|
|
163
|
|
|
164 */
|
|
|
165
|
|
|
166 #ifndef emacs
|
|
|
167 #define PERROR(arg) perror (arg); return -1
|
|
|
168 #else
|
|
|
169 #define IN_UNEXEC
|
|
|
170 #define DONT_ENCAPSULATE /* we include lisp.h so we want to make sure we
|
|
|
171 don't get filename conversion. The caller
|
|
|
172 of unexec() is assumed to have done this
|
|
|
173 already (it's easier to do it this way than
|
|
|
174 to modify all the unexec modules to ensure
|
|
|
175 that all weirdo functions, such as
|
|
|
176 elf_write_modified_data(), have proper
|
|
|
177 filename conversion applied). */
|
|
|
178 #include <config.h>
|
|
|
179 #define PERROR(file) report_error (file, new)
|
|
|
180 #endif
|
|
|
181
|
|
|
182 #if __STDC__ || defined(STDC_HEADERS)
|
|
|
183
|
|
|
184 /* I don't know how correct this attempt to get more prototypes is... */
|
|
|
185 # if defined(sun) && defined(_POSIX_SOURCE)
|
|
|
186 # undef _POSIX_SOURCE
|
|
|
187 # endif
|
|
|
188
|
|
|
189 # if defined(__lucid) && !defined(__STDC_EXTENDED__)
|
|
|
190 # define __STDC_EXTENDED__ 1
|
|
|
191 # endif
|
|
|
192
|
|
321
|
193 # include <stddef.h>
|
|
0
|
194 # include <stdlib.h>
|
|
|
195 # include <unistd.h>
|
|
|
196 # include <string.h>
|
|
|
197
|
|
|
198 # ifdef __lucid
|
|
|
199 # include <sysent.h>
|
|
|
200 # endif
|
|
|
201
|
|
|
202 #endif
|
|
|
203
|
|
|
204 /* I don't understand this, but it's necessary to get some slots in struct exec
|
|
|
205 from /usr/include/sys/exec.h when running LCC in strict ANSI mode. We don't
|
|
|
206 need this in K&R mode...
|
|
|
207 */
|
|
|
208 #if defined(__lucid) && defined(__sparc) && !defined(sun)
|
|
|
209 # define sun 1
|
|
|
210 #endif
|
|
|
211
|
|
|
212 #ifndef CANNOT_DUMP /* all rest of file! */
|
|
|
213
|
|
|
214 #ifdef COFF_ENCAPSULATE
|
|
|
215 int need_coff_header = 1;
|
|
|
216 #include <coff-encap/a.out.encap.h> /* The location might be a poor assumption */
|
|
|
217 #else
|
|
|
218 #ifdef MSDOS
|
|
|
219 #if __DJGPP__ > 1
|
|
|
220 #include <fcntl.h> /* for O_RDONLY, O_RDWR */
|
|
|
221 #endif
|
|
|
222 #include <coff.h>
|
|
|
223 #define filehdr external_filehdr
|
|
|
224 #define scnhdr external_scnhdr
|
|
|
225 #define syment external_syment
|
|
|
226 #define auxent external_auxent
|
|
|
227 #define n_numaux e_numaux
|
|
|
228 #define n_type e_type
|
|
|
229 struct aouthdr
|
|
|
230 {
|
|
|
231 unsigned short magic; /* type of file */
|
|
|
232 unsigned short vstamp; /* version stamp */
|
|
|
233 unsigned long tsize; /* text size in bytes, padded to FW bdry*/
|
|
|
234 unsigned long dsize; /* initialized data " " */
|
|
|
235 unsigned long bsize; /* uninitialized data " " */
|
|
|
236 unsigned long entry; /* entry pt. */
|
|
|
237 unsigned long text_start;/* base of text used for this file */
|
|
|
238 unsigned long data_start;/* base of data used for this file */
|
|
|
239 };
|
|
|
240
|
|
|
241
|
|
|
242 #else /* not MSDOS */
|
|
|
243 #include <a.out.h>
|
|
|
244 #endif /* not MSDOS */
|
|
|
245 #endif /* not COFF_ENCAPSULATE */
|
|
|
246
|
|
|
247 /* Define getpagesize if the system does not.
|
|
|
248 Note that this may depend on symbols defined in a.out.h. */
|
|
|
249 #include "getpagesize.h"
|
|
|
250
|
|
|
251 #ifndef makedev /* Try to detect types.h already loaded */
|
|
|
252 #include <sys/types.h>
|
|
|
253 #endif /* makedev */
|
|
|
254 #include <stdio.h>
|
|
|
255 #include <sys/stat.h>
|
|
|
256 #include <errno.h>
|
|
|
257
|
|
|
258 #include <sys/file.h> /* Must be after sys/types.h for USG and BSD4_1*/
|
|
|
259
|
|
|
260 #ifdef USG5
|
|
|
261 #include <fcntl.h>
|
|
|
262 #endif
|
|
|
263
|
|
|
264 #ifndef O_RDONLY
|
|
|
265 #define O_RDONLY 0
|
|
|
266 #endif
|
|
|
267 #ifndef O_RDWR
|
|
|
268 #define O_RDWR 2
|
|
|
269 #endif
|
|
|
270
|
|
|
271
|
|
|
272 extern char *start_of_text (); /* Start of text */
|
|
|
273
|
|
|
274 extern void *start_of_data (); /* Start of initialized data */
|
|
|
275
|
|
|
276 #ifdef COFF
|
|
|
277 static long block_copy_start; /* Old executable start point */
|
|
|
278 static struct filehdr f_hdr; /* File header */
|
|
|
279 static struct aouthdr f_ohdr; /* Optional file header (a.out) */
|
|
|
280 long bias; /* Bias to add for growth */
|
|
|
281 long lnnoptr; /* Pointer to line-number info within file */
|
|
|
282 #define SYMS_START block_copy_start
|
|
|
283
|
|
|
284 static long text_scnptr;
|
|
|
285 static long data_scnptr;
|
|
|
286
|
|
|
287 #else /* not COFF */
|
|
|
288
|
|
|
289 #ifdef __STDC__
|
|
|
290 #ifndef __sys_stdtypes_h
|
|
321
|
291 #if !defined(_PTRDIFF_T) && !defined(_BSD_PTRDIFF_T_)
|
|
0
|
292 typedef long ptrdiff_t;
|
|
|
293 #endif
|
|
|
294 #endif
|
|
|
295 #ifndef HPUX
|
|
|
296 /* not sure where this for NetBSD should really go
|
|
|
297 and it probably applies to other systems */
|
|
286
|
298 #if !defined(__NetBSD__) && !defined(__bsdi__) && !defined(__OpenBSD__)
|
|
0
|
299 extern void *sbrk (ptrdiff_t);
|
|
|
300 #else
|
|
|
301 extern char *sbrk ();
|
|
286
|
302 #endif /* __NetBSD__ or __OpenBSD__ */
|
|
0
|
303 #endif /* HPUX */
|
|
|
304 #else
|
|
|
305 extern void *sbrk ();
|
|
|
306 #endif
|
|
|
307
|
|
|
308 #define SYMS_START ((long) N_SYMOFF (ohdr))
|
|
|
309
|
|
|
310 /* Some machines override the structure name for an a.out header. */
|
|
|
311 #ifndef EXEC_HDR_TYPE
|
|
|
312 #define EXEC_HDR_TYPE struct exec
|
|
|
313 #endif
|
|
|
314
|
|
|
315 #ifdef HPUX
|
|
|
316 #ifdef HP9000S200_ID
|
|
|
317 #define MY_ID HP9000S200_ID
|
|
|
318 #else
|
|
|
319 #include <model.h>
|
|
|
320 #define MY_ID MYSYS
|
|
|
321 #endif /* no HP9000S200_ID */
|
|
|
322 static MAGIC OLDMAGIC = {MY_ID, SHARE_MAGIC};
|
|
|
323 static MAGIC NEWMAGIC = {MY_ID, DEMAND_MAGIC};
|
|
|
324 #define N_TXTOFF(x) TEXT_OFFSET(x)
|
|
|
325 #define N_SYMOFF(x) LESYM_OFFSET(x)
|
|
|
326 static EXEC_HDR_TYPE hdr, ohdr;
|
|
|
327
|
|
|
328 #else /* not HPUX */
|
|
|
329
|
|
|
330 #if defined (USG) && !defined (IBMAIX) && !defined (IRIS) && !defined (COFF_ENCAPSULATE) && !defined (LINUX)
|
|
|
331 static struct bhdr hdr, ohdr;
|
|
|
332 #define a_magic fmagic
|
|
|
333 #define a_text tsize
|
|
|
334 #define a_data dsize
|
|
|
335 #define a_bss bsize
|
|
|
336 #define a_syms ssize
|
|
|
337 #define a_trsize rtsize
|
|
|
338 #define a_drsize rdsize
|
|
|
339 #define a_entry entry
|
|
|
340 #define N_BADMAG(x) \
|
|
|
341 (((x).fmagic)!=OMAGIC && ((x).fmagic)!=NMAGIC &&\
|
|
|
342 ((x).fmagic)!=FMAGIC && ((x).fmagic)!=IMAGIC)
|
|
|
343 #define NEWMAGIC FMAGIC
|
|
|
344 #else /* IRIS or IBMAIX or not USG */
|
|
|
345 static EXEC_HDR_TYPE hdr, ohdr;
|
|
|
346 #define NEWMAGIC ZMAGIC
|
|
|
347 #endif /* IRIS or IBMAIX not USG */
|
|
|
348 #endif /* not HPUX */
|
|
|
349
|
|
|
350 static int unexec_text_start;
|
|
|
351 static int unexec_data_start;
|
|
|
352
|
|
|
353 #ifdef COFF_ENCAPSULATE
|
|
|
354 /* coffheader is defined in the GNU a.out.encap.h file. */
|
|
|
355 struct coffheader coffheader;
|
|
|
356 #endif
|
|
|
357
|
|
|
358 #endif /* not COFF */
|
|
|
359
|
|
|
360 static int pagemask;
|
|
|
361
|
|
|
362 /* Correct an int which is the bit pattern of a pointer to a byte
|
|
|
363 into an int which is the number of a byte.
|
|
|
364 This is a no-op on ordinary machines, but not on all. */
|
|
|
365
|
|
|
366 #ifndef ADDR_CORRECT /* Let m-*.h files override this definition */
|
|
|
367 #define ADDR_CORRECT(x) ((char *)(x) - (char*)0)
|
|
|
368 #endif
|
|
|
369
|
|
|
370 #ifdef emacs
|
|
|
371
|
|
|
372 #include "lisp.h"
|
|
|
373
|
|
|
374 static void
|
|
|
375 report_error (file, fd)
|
|
|
376 CONST char *file;
|
|
|
377 int fd;
|
|
|
378 {
|
|
|
379 if (fd)
|
|
|
380 close (fd);
|
|
|
381 report_file_error ("Cannot unexec",
|
|
|
382 Fcons (build_ext_string (file, FORMAT_FILENAME), Qnil));
|
|
|
383 }
|
|
|
384 #endif /* emacs */
|
|
|
385
|
|
|
386 #define ERROR0(msg) report_error_1 (new, msg, 0, 0); return -1
|
|
|
387 #define ERROR1(msg,x) report_error_1 (new, msg, x, 0); return -1
|
|
|
388 #define ERROR2(msg,x,y) report_error_1 (new, msg, x, y); return -1
|
|
|
389
|
|
|
390 static void
|
|
|
391 report_error_1 (fd, msg, a1, a2)
|
|
|
392 int fd;
|
|
|
393 CONST char *msg;
|
|
|
394 int a1, a2;
|
|
|
395 {
|
|
|
396 close (fd);
|
|
|
397 #ifdef emacs
|
|
|
398 error (msg, a1, a2);
|
|
|
399 #else
|
|
|
400 fprintf (stderr, msg, a1, a2);
|
|
|
401 fprintf (stderr, "\n");
|
|
|
402 #endif
|
|
|
403 }
|
|
|
404
|
|
|
405 static int make_hdr (int new, int a_out, unsigned data_start,
|
|
|
406 unsigned bss_start, unsigned entry_address,
|
|
|
407 char *a_name, char *new_name);
|
|
|
408 static int copy_text_and_data (int new, int a_out);
|
|
|
409 static int copy_sym (int new, int a_out, char *a_name, char *new_name);
|
|
|
410 static void mark_x (char *name);
|
|
|
411
|
|
|
412 /* ****************************************************************
|
|
|
413 * unexec
|
|
|
414 *
|
|
|
415 * driving logic.
|
|
|
416 */
|
|
|
417 int
|
|
|
418 unexec (new_name, a_name, data_start, bss_start, entry_address)
|
|
|
419 char *new_name, *a_name;
|
|
|
420 unsigned data_start, bss_start, entry_address;
|
|
|
421 {
|
|
|
422 int new, a_out = -1;
|
|
|
423
|
|
|
424 if (a_name && (a_out = open (a_name, O_RDONLY)) < 0)
|
|
|
425 {
|
|
|
426 PERROR (a_name);
|
|
|
427 }
|
|
|
428 if ((new = creat (new_name, 0666)) < 0)
|
|
|
429 {
|
|
|
430 PERROR (new_name);
|
|
|
431 }
|
|
|
432
|
|
|
433 if (make_hdr (new, a_out, data_start, bss_start, entry_address, a_name, new_name) < 0
|
|
|
434 || copy_text_and_data (new, a_out) < 0
|
|
|
435 || copy_sym (new, a_out, a_name, new_name) < 0
|
|
|
436 #ifdef COFF
|
|
|
437 #ifndef COFF_BSD_SYMBOLS
|
|
|
438 || adjust_lnnoptrs (new, a_out, new_name) < 0
|
|
|
439 #endif
|
|
|
440 #endif
|
|
|
441 )
|
|
|
442 {
|
|
|
443 close (new);
|
|
|
444 /* unlink (new_name); / * Failed, unlink new a.out */
|
|
|
445 return -1;
|
|
|
446 }
|
|
|
447
|
|
|
448 close (new);
|
|
|
449 if (a_out >= 0)
|
|
|
450 close (a_out);
|
|
|
451 mark_x (new_name);
|
|
|
452 return 0;
|
|
|
453 }
|
|
|
454
|
|
|
455 /* ****************************************************************
|
|
|
456 * make_hdr
|
|
|
457 *
|
|
|
458 * Make the header in the new a.out from the header in core.
|
|
|
459 * Modify the text and data sizes.
|
|
|
460 */
|
|
|
461 static int
|
|
|
462 make_hdr (int new, int a_out, unsigned data_start, unsigned bss_start,
|
|
|
463 unsigned entry_address, char *a_name, char *new_name)
|
|
|
464 {
|
|
|
465 #ifdef COFF
|
|
|
466 auto struct scnhdr f_thdr; /* Text section header */
|
|
|
467 auto struct scnhdr f_dhdr; /* Data section header */
|
|
|
468 auto struct scnhdr f_bhdr; /* Bss section header */
|
|
|
469 auto struct scnhdr scntemp; /* Temporary section header */
|
|
|
470 int scns;
|
|
|
471 #endif /* COFF */
|
|
|
472 #ifdef USG_SHARED_LIBRARIES
|
|
|
473 extern unsigned int bss_end;
|
|
|
474 #else
|
|
|
475 unsigned int bss_end;
|
|
|
476 #endif
|
|
|
477
|
|
|
478 pagemask = getpagesize () - 1;
|
|
|
479
|
|
|
480 /* Adjust text/data boundary. */
|
|
|
481 #ifdef NO_REMAP
|
|
|
482 data_start = (int) start_of_data ();
|
|
|
483 #else /* not NO_REMAP */
|
|
|
484 if (!data_start)
|
|
|
485 data_start = (int) start_of_data ();
|
|
|
486 #endif /* not NO_REMAP */
|
|
|
487 data_start = ADDR_CORRECT (data_start);
|
|
|
488
|
|
|
489 #ifdef SEGMENT_MASK
|
|
|
490 data_start = data_start & ~SEGMENT_MASK; /* (Down) to segment boundary. */
|
|
|
491 #else
|
|
|
492 data_start = data_start & ~pagemask; /* (Down) to page boundary. */
|
|
|
493 #endif
|
|
|
494
|
|
|
495 bss_end = ADDR_CORRECT (sbrk (0)) + pagemask;
|
|
|
496 bss_end &= ~ pagemask;
|
|
|
497
|
|
|
498 /* Adjust data/bss boundary. */
|
|
|
499 if (bss_start != 0)
|
|
|
500 {
|
|
|
501 bss_start = (ADDR_CORRECT (bss_start) + pagemask);
|
|
|
502 /* (Up) to page bdry. */
|
|
|
503 bss_start &= ~ pagemask;
|
|
|
504 if (bss_start > bss_end)
|
|
|
505 {
|
|
|
506 ERROR1 ("unexec: Specified bss_start (%u) is past end of program",
|
|
|
507 bss_start);
|
|
|
508 }
|
|
|
509 }
|
|
|
510 else
|
|
|
511 bss_start = bss_end;
|
|
|
512
|
|
|
513 if (data_start > bss_start) /* Can't have negative data size. */
|
|
|
514 {
|
|
|
515 ERROR2 ("unexec: data_start (%u) can't be greater than bss_start (%u)",
|
|
|
516 data_start, bss_start);
|
|
|
517 }
|
|
|
518
|
|
|
519 #ifdef COFF
|
|
|
520 /* Salvage as much info from the existing file as possible */
|
|
|
521 if (a_out >= 0)
|
|
|
522 {
|
|
|
523 if (read (a_out, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr))
|
|
|
524 {
|
|
|
525 PERROR (a_name);
|
|
|
526 }
|
|
|
527 block_copy_start += sizeof (f_hdr);
|
|
|
528 if (f_hdr.f_opthdr > 0)
|
|
|
529 {
|
|
|
530 if (read (a_out, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr))
|
|
|
531 {
|
|
|
532 PERROR (a_name);
|
|
|
533 }
|
|
|
534 block_copy_start += sizeof (f_ohdr);
|
|
|
535 }
|
|
|
536 /* Loop through section headers, copying them in */
|
|
|
537 lseek (a_out, sizeof (f_hdr) + f_hdr.f_opthdr, 0);
|
|
|
538 for (scns = f_hdr.f_nscns; scns > 0; scns--) {
|
|
|
539 if (read (a_out, &scntemp, sizeof (scntemp)) != sizeof (scntemp))
|
|
|
540 {
|
|
|
541 PERROR (a_name);
|
|
|
542 }
|
|
|
543 if (scntemp.s_scnptr > 0L)
|
|
|
544 {
|
|
|
545 if (block_copy_start < scntemp.s_scnptr + scntemp.s_size)
|
|
|
546 block_copy_start = scntemp.s_scnptr + scntemp.s_size;
|
|
|
547 }
|
|
|
548 if (strcmp (scntemp.s_name, ".text") == 0)
|
|
|
549 {
|
|
|
550 f_thdr = scntemp;
|
|
|
551 }
|
|
|
552 else if (strcmp (scntemp.s_name, ".data") == 0)
|
|
|
553 {
|
|
|
554 f_dhdr = scntemp;
|
|
|
555 }
|
|
|
556 else if (strcmp (scntemp.s_name, ".bss") == 0)
|
|
|
557 {
|
|
|
558 f_bhdr = scntemp;
|
|
|
559 }
|
|
|
560 }
|
|
|
561 }
|
|
|
562 else
|
|
|
563 {
|
|
|
564 ERROR0 ("can't build a COFF file from scratch yet");
|
|
|
565 }
|
|
|
566
|
|
|
567 /* Now we alter the contents of all the f_*hdr variables
|
|
|
568 to correspond to what we want to dump. */
|
|
|
569
|
|
|
570 #ifdef USG_SHARED_LIBRARIES
|
|
|
571
|
|
|
572 /* The amount of data we're adding to the file is distance from the
|
|
|
573 * end of the original .data space to the current end of the .data
|
|
|
574 * space.
|
|
|
575 */
|
|
|
576
|
|
|
577 bias = bss_start - (f_ohdr.data_start + f_dhdr.s_size);
|
|
|
578
|
|
|
579 #endif
|
|
|
580
|
|
|
581 f_hdr.f_flags |= (F_RELFLG | F_EXEC);
|
|
|
582 #ifdef TPIX
|
|
|
583 f_hdr.f_nscns = 3;
|
|
|
584 #endif
|
|
|
585 #ifdef EXEC_MAGIC
|
|
|
586 f_ohdr.magic = EXEC_MAGIC;
|
|
|
587 #endif
|
|
|
588 #ifndef NO_REMAP
|
|
|
589 f_ohdr.text_start = (long) start_of_text ();
|
|
|
590 f_ohdr.tsize = data_start - f_ohdr.text_start;
|
|
|
591 f_ohdr.data_start = data_start;
|
|
|
592 #endif /* NO_REMAP */
|
|
|
593 f_ohdr.dsize = bss_start - f_ohdr.data_start;
|
|
|
594 f_ohdr.bsize = bss_end - bss_start;
|
|
|
595 #ifndef KEEP_OLD_TEXT_SCNPTR
|
|
|
596 /* On some machines, the old values are right.
|
|
|
597 ??? Maybe on all machines with NO_REMAP. */
|
|
|
598 f_thdr.s_size = f_ohdr.tsize;
|
|
|
599 f_thdr.s_scnptr = sizeof (f_hdr) + sizeof (f_ohdr);
|
|
|
600 f_thdr.s_scnptr += (f_hdr.f_nscns) * (sizeof (f_thdr));
|
|
|
601 #endif /* KEEP_OLD_TEXT_SCNPTR */
|
|
|
602 #ifdef ADJUST_TEXT_SCNHDR_SIZE
|
|
|
603 /* On some machines, `text size' includes all headers. */
|
|
|
604 f_thdr.s_size -= f_thdr.s_scnptr;
|
|
|
605 #endif /* ADJUST_TEST_SCNHDR_SIZE */
|
|
|
606 lnnoptr = f_thdr.s_lnnoptr;
|
|
|
607 #ifdef SECTION_ALIGNMENT
|
|
|
608 /* Some systems require special alignment
|
|
|
609 of the sections in the file itself. */
|
|
|
610 f_thdr.s_scnptr
|
|
|
611 = (f_thdr.s_scnptr + SECTION_ALIGNMENT) & ~SECTION_ALIGNMENT;
|
|
|
612 #endif /* SECTION_ALIGNMENT */
|
|
|
613 #ifdef TPIX
|
|
|
614 f_thdr.s_scnptr = 0xd0;
|
|
|
615 #endif
|
|
|
616 text_scnptr = f_thdr.s_scnptr;
|
|
|
617 #ifdef ADJUST_TEXTBASE
|
|
|
618 text_scnptr = sizeof (f_hdr) + sizeof (f_ohdr) + (f_hdr.f_nscns) * (sizeof (f_thdr));
|
|
|
619 #endif
|
|
|
620 #ifndef KEEP_OLD_PADDR
|
|
|
621 f_dhdr.s_paddr = f_ohdr.data_start;
|
|
|
622 #endif /* KEEP_OLD_PADDR */
|
|
|
623 f_dhdr.s_vaddr = f_ohdr.data_start;
|
|
|
624 f_dhdr.s_size = f_ohdr.dsize;
|
|
|
625 f_dhdr.s_scnptr = f_thdr.s_scnptr + f_thdr.s_size;
|
|
|
626 #ifdef SECTION_ALIGNMENT
|
|
|
627 /* Some systems require special alignment
|
|
|
628 of the sections in the file itself. */
|
|
|
629 f_dhdr.s_scnptr
|
|
|
630 = (f_dhdr.s_scnptr + SECTION_ALIGNMENT) & ~SECTION_ALIGNMENT;
|
|
|
631 #endif /* SECTION_ALIGNMENT */
|
|
|
632 #ifdef DATA_SECTION_ALIGNMENT
|
|
|
633 /* Some systems require special alignment
|
|
|
634 of the data section only. */
|
|
|
635 f_dhdr.s_scnptr
|
|
|
636 = (f_dhdr.s_scnptr + DATA_SECTION_ALIGNMENT) & ~DATA_SECTION_ALIGNMENT;
|
|
|
637 #endif /* DATA_SECTION_ALIGNMENT */
|
|
|
638 data_scnptr = f_dhdr.s_scnptr;
|
|
|
639 #ifndef KEEP_OLD_PADDR
|
|
|
640 f_bhdr.s_paddr = f_ohdr.data_start + f_ohdr.dsize;
|
|
|
641 #endif /* KEEP_OLD_PADDR */
|
|
|
642 f_bhdr.s_vaddr = f_ohdr.data_start + f_ohdr.dsize;
|
|
|
643 f_bhdr.s_size = f_ohdr.bsize;
|
|
|
644 f_bhdr.s_scnptr = 0L;
|
|
|
645 #ifndef USG_SHARED_LIBRARIES
|
|
|
646 bias = f_dhdr.s_scnptr + f_dhdr.s_size - block_copy_start;
|
|
|
647 #endif
|
|
|
648
|
|
|
649 if (f_hdr.f_symptr > 0L)
|
|
|
650 {
|
|
|
651 f_hdr.f_symptr += bias;
|
|
|
652 }
|
|
|
653
|
|
|
654 if (f_thdr.s_lnnoptr > 0L)
|
|
|
655 {
|
|
|
656 f_thdr.s_lnnoptr += bias;
|
|
|
657 }
|
|
|
658
|
|
|
659 #ifdef ADJUST_EXEC_HEADER
|
|
|
660 ADJUST_EXEC_HEADER;
|
|
|
661 #endif /* ADJUST_EXEC_HEADER */
|
|
|
662
|
|
|
663 if (write (new, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr))
|
|
|
664 {
|
|
|
665 PERROR (new_name);
|
|
|
666 }
|
|
|
667
|
|
|
668 if (write (new, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr))
|
|
|
669 {
|
|
|
670 PERROR (new_name);
|
|
|
671 }
|
|
|
672
|
|
|
673 #ifndef USG_SHARED_LIBRARIES
|
|
|
674
|
|
|
675 if (write (new, &f_thdr, sizeof (f_thdr)) != sizeof (f_thdr))
|
|
|
676 {
|
|
|
677 PERROR (new_name);
|
|
|
678 }
|
|
|
679
|
|
|
680 if (write (new, &f_dhdr, sizeof (f_dhdr)) != sizeof (f_dhdr))
|
|
|
681 {
|
|
|
682 PERROR (new_name);
|
|
|
683 }
|
|
|
684
|
|
|
685 if (write (new, &f_bhdr, sizeof (f_bhdr)) != sizeof (f_bhdr))
|
|
|
686 {
|
|
|
687 PERROR (new_name);
|
|
|
688 }
|
|
|
689
|
|
|
690 #else /* USG_SHARED_LIBRARIES */
|
|
|
691
|
|
|
692 /* The purpose of this code is to write out the new file's section
|
|
|
693 * header table.
|
|
|
694 *
|
|
|
695 * Scan through the original file's sections. If the encountered
|
|
|
696 * section is one we know (.text, .data or .bss), write out the
|
|
|
697 * correct header. If it is a section we do not know (such as
|
|
|
698 * .lib), adjust the address of where the section data is in the
|
|
|
699 * file, and write out the header.
|
|
|
700 *
|
|
|
701 * If any section precedes .text or .data in the file, this code
|
|
|
702 * will not adjust the file pointer for that section correctly.
|
|
|
703 */
|
|
|
704
|
|
|
705 /* This used to use sizeof (f_ohdr) instead of .f_opthdr.
|
|
|
706 .f_opthdr is said to be right when there is no optional header. */
|
|
|
707 lseek (a_out, sizeof (f_hdr) + f_hdr.f_opthdr, 0);
|
|
|
708
|
|
|
709 for (scns = f_hdr.f_nscns; scns > 0; scns--)
|
|
|
710 {
|
|
|
711 if (read (a_out, &scntemp, sizeof (scntemp)) != sizeof (scntemp))
|
|
|
712 PERROR (a_name);
|
|
|
713
|
|
|
714 if (!strcmp (scntemp.s_name, f_thdr.s_name)) /* .text */
|
|
|
715 {
|
|
|
716 if (write (new, &f_thdr, sizeof (f_thdr)) != sizeof (f_thdr))
|
|
|
717 PERROR (new_name);
|
|
|
718 }
|
|
|
719 else if (!strcmp (scntemp.s_name, f_dhdr.s_name)) /* .data */
|
|
|
720 {
|
|
|
721 if (write (new, &f_dhdr, sizeof (f_dhdr)) != sizeof (f_dhdr))
|
|
|
722 PERROR (new_name);
|
|
|
723 }
|
|
|
724 else if (!strcmp (scntemp.s_name, f_bhdr.s_name)) /* .bss */
|
|
|
725 {
|
|
|
726 if (write (new, &f_bhdr, sizeof (f_bhdr)) != sizeof (f_bhdr))
|
|
|
727 PERROR (new_name);
|
|
|
728 }
|
|
|
729 else
|
|
|
730 {
|
|
|
731 if (scntemp.s_scnptr)
|
|
|
732 scntemp.s_scnptr += bias;
|
|
|
733 if (write (new, &scntemp, sizeof (scntemp)) != sizeof (scntemp))
|
|
|
734 PERROR (new_name);
|
|
|
735 }
|
|
|
736 }
|
|
|
737 #endif /* USG_SHARED_LIBRARIES */
|
|
|
738
|
|
|
739 return (0);
|
|
|
740
|
|
|
741 #else /* if not COFF */
|
|
|
742
|
|
|
743 /* Get symbol table info from header of a.out file if given one. */
|
|
|
744 if (a_out >= 0)
|
|
|
745 {
|
|
|
746 #ifdef COFF_ENCAPSULATE
|
|
|
747 if (read (a_out, &coffheader, sizeof coffheader) != sizeof coffheader)
|
|
|
748 {
|
|
|
749 PERROR(a_name);
|
|
|
750 }
|
|
|
751 if (coffheader.f_magic != COFF_MAGIC)
|
|
|
752 {
|
|
|
753 ERROR1("%s doesn't have legal coff magic number\n", a_name);
|
|
|
754 }
|
|
|
755 #endif
|
|
|
756 if (read (a_out, (char *) &ohdr, sizeof hdr) != sizeof hdr)
|
|
|
757 {
|
|
|
758 PERROR (a_name);
|
|
|
759 }
|
|
|
760
|
|
|
761 if (N_BADMAG (ohdr))
|
|
|
762 {
|
|
|
763 ERROR1 ("invalid magic number in %s", a_name);
|
|
|
764 }
|
|
|
765 hdr = ohdr;
|
|
|
766 }
|
|
|
767 else
|
|
|
768 {
|
|
|
769 #ifdef COFF_ENCAPSULATE
|
|
|
770 /* We probably could without too much trouble. The code is in gld
|
|
|
771 * but I don't have that much time or incentive.
|
|
|
772 */
|
|
|
773 ERROR0 ("can't build a COFF file from scratch yet");
|
|
|
774 #else
|
|
|
775 memset ((void *)&hdr, 0, sizeof hdr);
|
|
|
776 #endif
|
|
|
777 }
|
|
|
778
|
|
|
779 unexec_text_start = (long) start_of_text ();
|
|
|
780 unexec_data_start = data_start;
|
|
|
781
|
|
|
782 /* Machine-dependent fixup for header, or maybe for unexec_text_start */
|
|
|
783 #ifdef ADJUST_EXEC_HEADER
|
|
|
784 ADJUST_EXEC_HEADER;
|
|
|
785 #endif /* ADJUST_EXEC_HEADER */
|
|
|
786
|
|
|
787 hdr.a_trsize = 0;
|
|
|
788 hdr.a_drsize = 0;
|
|
|
789 if (entry_address != 0)
|
|
|
790 hdr.a_entry = entry_address;
|
|
|
791
|
|
|
792 hdr.a_bss = bss_end - bss_start;
|
|
|
793 hdr.a_data = bss_start - data_start;
|
|
|
794 #ifdef NO_REMAP
|
|
|
795 hdr.a_text = ohdr.a_text;
|
|
|
796 #else /* not NO_REMAP */
|
|
|
797 hdr.a_text = data_start - unexec_text_start;
|
|
|
798
|
|
|
799 #ifdef A_TEXT_OFFSET
|
|
|
800 hdr.a_text += A_TEXT_OFFSET (ohdr);
|
|
|
801 #endif
|
|
|
802
|
|
|
803 #endif /* not NO_REMAP */
|
|
|
804
|
|
|
805 #ifdef COFF_ENCAPSULATE
|
|
|
806 /* We are encapsulating BSD format within COFF format. */
|
|
|
807 {
|
|
|
808 struct coffscn *tp, *dp, *bp;
|
|
|
809 tp = &coffheader.scns[0];
|
|
|
810 dp = &coffheader.scns[1];
|
|
|
811 bp = &coffheader.scns[2];
|
|
|
812 tp->s_size = hdr.a_text + sizeof(struct exec);
|
|
|
813 dp->s_paddr = data_start;
|
|
|
814 dp->s_vaddr = data_start;
|
|
|
815 dp->s_size = hdr.a_data;
|
|
|
816 bp->s_paddr = dp->s_vaddr + dp->s_size;
|
|
|
817 bp->s_vaddr = bp->s_paddr;
|
|
|
818 bp->s_size = hdr.a_bss;
|
|
|
819 coffheader.tsize = tp->s_size;
|
|
|
820 coffheader.dsize = dp->s_size;
|
|
|
821 coffheader.bsize = bp->s_size;
|
|
|
822 coffheader.text_start = tp->s_vaddr;
|
|
|
823 coffheader.data_start = dp->s_vaddr;
|
|
|
824 }
|
|
|
825 if (write (new, &coffheader, sizeof coffheader) != sizeof coffheader)
|
|
|
826 {
|
|
|
827 PERROR(new_name);
|
|
|
828 }
|
|
|
829 #endif /* COFF_ENCAPSULATE */
|
|
|
830
|
|
|
831 if (write (new, (char *) &hdr, sizeof hdr) != sizeof hdr)
|
|
|
832 {
|
|
|
833 PERROR (new_name);
|
|
|
834 }
|
|
|
835
|
|
|
836 #if 0 /* This #ifndef caused a bug on Linux when using QMAGIC. */
|
|
|
837 /* This adjustment was done above only #ifndef NO_REMAP,
|
|
|
838 so only undo it now #ifndef NO_REMAP. */
|
|
|
839 /* #ifndef NO_REMAP */
|
|
|
840 #endif
|
|
|
841 #ifdef A_TEXT_OFFSET
|
|
|
842 hdr.a_text -= A_TEXT_OFFSET (ohdr);
|
|
|
843 #endif
|
|
|
844
|
|
|
845 return 0;
|
|
|
846
|
|
|
847 #endif /* not COFF */
|
|
|
848 }
|
|
|
849
|
|
|
850 static void write_segment (int, char *, char *);
|
|
|
851
|
|
|
852 /* ****************************************************************
|
|
|
853 * copy_text_and_data
|
|
|
854 *
|
|
|
855 * Copy the text and data segments from memory to the new a.out
|
|
|
856 */
|
|
|
857 static int
|
|
|
858 copy_text_and_data (int new, int a_out)
|
|
|
859 {
|
|
|
860 char *end;
|
|
|
861 char *ptr;
|
|
|
862
|
|
|
863 #ifdef COFF
|
|
|
864
|
|
|
865 #ifdef USG_SHARED_LIBRARIES
|
|
|
866
|
|
|
867 int scns;
|
|
|
868 struct scnhdr scntemp; /* Temporary section header */
|
|
|
869
|
|
|
870 /* The purpose of this code is to write out the new file's section
|
|
|
871 * contents.
|
|
|
872 *
|
|
|
873 * Step through the section table. If we know the section (.text,
|
|
|
874 * .data) do the appropriate thing. Otherwise, if the section has
|
|
|
875 * no allocated space in the file (.bss), do nothing. Otherwise,
|
|
|
876 * the section has space allocated in the file, and is not a section
|
|
|
877 * we know. So just copy it.
|
|
|
878 */
|
|
|
879
|
|
|
880 lseek (a_out, sizeof (struct filehdr) + sizeof (struct aouthdr), 0);
|
|
|
881
|
|
|
882 for (scns = f_hdr.f_nscns; scns > 0; scns--)
|
|
|
883 {
|
|
|
884 if (read (a_out, &scntemp, sizeof (scntemp)) != sizeof (scntemp))
|
|
|
885 PERROR ("temacs");
|
|
|
886
|
|
|
887 if (!strcmp (scntemp.s_name, ".text"))
|
|
|
888 {
|
|
|
889 lseek (new, (long) text_scnptr, 0);
|
|
|
890 ptr = (char *) f_ohdr.text_start;
|
|
|
891 end = ptr + f_ohdr.tsize;
|
|
|
892 write_segment (new, ptr, end);
|
|
|
893 }
|
|
|
894 else if (!strcmp (scntemp.s_name, ".data"))
|
|
|
895 {
|
|
|
896 lseek (new, (long) data_scnptr, 0);
|
|
|
897 ptr = (char *) f_ohdr.data_start;
|
|
|
898 end = ptr + f_ohdr.dsize;
|
|
|
899 write_segment (new, ptr, end);
|
|
|
900 }
|
|
|
901 else if (!scntemp.s_scnptr)
|
|
|
902 ; /* do nothing - no data for this section */
|
|
|
903 else
|
|
|
904 {
|
|
|
905 char page[BUFSIZ];
|
|
|
906 int size, n;
|
|
|
907 long old_a_out_ptr = lseek (a_out, 0, 1);
|
|
|
908
|
|
|
909 lseek (a_out, scntemp.s_scnptr, 0);
|
|
|
910 for (size = scntemp.s_size; size > 0; size -= sizeof (page))
|
|
|
911 {
|
|
|
912 n = size > sizeof (page) ? sizeof (page) : size;
|
|
|
913 if (read (a_out, page, n) != n || write (new, page, n) != n)
|
|
|
914 PERROR ("emacs");
|
|
|
915 }
|
|
|
916 lseek (a_out, old_a_out_ptr, 0);
|
|
|
917 }
|
|
|
918 }
|
|
|
919
|
|
|
920 #else /* COFF, but not USG_SHARED_LIBRARIES */
|
|
|
921
|
|
|
922 #ifdef MSDOS
|
|
|
923 #if __DJGPP__ >= 2
|
|
|
924 /* Dump the original table of exception handlers, not the one
|
|
|
925 where our exception hooks are registered. */
|
|
|
926 __djgpp_exception_toggle ();
|
|
|
927 #endif
|
|
|
928 #endif
|
|
|
929
|
|
|
930 lseek (new, (long) text_scnptr, 0);
|
|
|
931 ptr = (char *) f_ohdr.text_start;
|
|
|
932 #ifdef HEADER_INCL_IN_TEXT
|
|
|
933 /* For Gould UTX/32, text starts after headers */
|
|
|
934 ptr = (char *) (ptr + text_scnptr);
|
|
|
935 #endif /* HEADER_INCL_IN_TEXT */
|
|
|
936 end = ptr + f_ohdr.tsize;
|
|
|
937 write_segment (new, ptr, end);
|
|
|
938
|
|
|
939 lseek (new, (long) data_scnptr, 0);
|
|
|
940 ptr = (char *) f_ohdr.data_start;
|
|
|
941 end = ptr + f_ohdr.dsize;
|
|
|
942 write_segment (new, ptr, end);
|
|
|
943
|
|
|
944 #ifdef MSDOS
|
|
|
945 #if __DJGPP__ >= 2
|
|
|
946 /* Restore our exception hooks. */
|
|
|
947 __djgpp_exception_toggle ();
|
|
|
948 #endif
|
|
|
949 #endif
|
|
|
950
|
|
|
951 #endif /* USG_SHARED_LIBRARIES */
|
|
|
952
|
|
|
953 #else /* if not COFF */
|
|
|
954
|
|
|
955 /* Some machines count the header as part of the text segment.
|
|
|
956 That is to say, the header appears in core
|
|
|
957 just before the address that start_of_text returns.
|
|
|
958 For them, N_TXTOFF is the place where the header goes.
|
|
|
959 We must adjust the seek to the place after the header.
|
|
|
960 Note that at this point hdr.a_text does *not* count
|
|
|
961 the extra A_TEXT_OFFSET bytes, only the actual bytes of code. */
|
|
|
962
|
|
|
963 #ifdef A_TEXT_SEEK
|
|
|
964 lseek (new, (long) A_TEXT_SEEK (hdr), 0);
|
|
|
965 #else
|
|
|
966 lseek (new, (long) N_TXTOFF (hdr), 0);
|
|
|
967 #endif /* no A_TEXT_SEEK */
|
|
|
968
|
|
|
969 #ifdef RISCiX
|
|
|
970
|
|
|
971 /* Acorn's RISC-iX has a wacky way of initialising the position of the heap.
|
|
|
972 * There is a little table in crt0.o that is filled at link time with
|
|
|
973 * the min and current brk positions, among other things. When start
|
|
|
974 * runs, it copies the table to where these parameters live during
|
|
|
975 * execution. This data is in text space, so it cannot be modified here
|
|
|
976 * before saving the executable, so the data is written manually. In
|
|
|
977 * addition, the table does not have a label, and the nearest accessible
|
|
|
978 * label (mcount) is not prefixed with a '_', thus making it inaccessible
|
|
|
979 * from within C programs. To overcome this, emacs's executable is passed
|
|
|
980 * through the command 'nm %s | fgrep mcount' into a pipe, and the
|
|
|
981 * resultant output is then used to find the address of 'mcount'. As far as
|
|
|
982 * is possible to determine, in RISC-iX releases prior to 1.2, the negative
|
|
|
983 * offset of the table from mcount is 0x2c, whereas from 1.2 onwards it is
|
|
|
984 * 0x30. bss_end has been rounded up to page boundary. This solution is
|
|
|
985 * based on suggestions made by Kevin Welton and Steve Hunt of Acorn, and
|
|
|
986 * avoids the need for a custom version of crt0.o for emacs which has its
|
|
|
987 * table in data space.
|
|
|
988 */
|
|
|
989
|
|
|
990 {
|
|
|
991 char command[1024];
|
|
|
992 char errbuf[1024];
|
|
|
993 char address_text[32];
|
|
|
994 int proforma[4];
|
|
|
995 FILE *pfile;
|
|
|
996 char *temp_ptr;
|
|
|
997 char c;
|
|
|
998 int mcount_address, mcount_offset, count;
|
|
|
999 extern char *_execname;
|
|
|
1000
|
|
|
1001
|
|
|
1002 /* The use of _execname is incompatible with RISCiX 1.1 */
|
|
|
1003 sprintf (command, "nm %s | fgrep mcount", _execname);
|
|
|
1004
|
|
|
1005 if ( (pfile = popen(command, "r")) == NULL)
|
|
|
1006 {
|
|
|
1007 sprintf (errbuf, "Could not open pipe");
|
|
|
1008 PERROR (errbuf);
|
|
|
1009 }
|
|
|
1010
|
|
|
1011 count=0;
|
|
|
1012 while ( ((c=getc(pfile)) != EOF) && (c != ' ') && (count < 31))
|
|
|
1013 address_text[count++]=c;
|
|
|
1014 address_text[count]=0;
|
|
|
1015
|
|
|
1016 if ((count == 0) || pclose(pfile) != NULL)
|
|
|
1017 {
|
|
|
1018 sprintf (errbuf, "Failed to execute the command '%s'\n", command);
|
|
|
1019 PERROR (errbuf);
|
|
|
1020 }
|
|
|
1021
|
|
|
1022 sscanf(address_text, "%x", &mcount_address);
|
|
|
1023 ptr = (char *) unexec_text_start;
|
|
|
1024 mcount_offset = (char *)mcount_address - ptr;
|
|
|
1025
|
|
|
1026 #ifdef RISCiX_1_1
|
|
|
1027 #define EDATA_OFFSET 0x2c
|
|
|
1028 #else
|
|
|
1029 #define EDATA_OFFSET 0x30
|
|
|
1030 #endif
|
|
|
1031
|
|
|
1032 end = ptr + mcount_offset - EDATA_OFFSET;
|
|
|
1033
|
|
|
1034 write_segment (new, ptr, end);
|
|
|
1035
|
|
|
1036 proforma[0] = bss_end; /* becomes _edata */
|
|
|
1037 proforma[1] = bss_end; /* becomes _end */
|
|
|
1038 proforma[2] = bss_end; /* becomes _minbrk */
|
|
|
1039 proforma[3] = bss_end; /* becomes _curbrk */
|
|
|
1040
|
|
|
1041 write (new, proforma, 16);
|
|
|
1042
|
|
|
1043 temp_ptr = ptr;
|
|
|
1044 ptr = end + 16;
|
|
|
1045 end = temp_ptr + hdr.a_text;
|
|
|
1046
|
|
|
1047 write_segment (new, ptr, end);
|
|
|
1048 }
|
|
|
1049
|
|
|
1050 #else /* !RISCiX */
|
|
|
1051 ptr = (char *) unexec_text_start;
|
|
|
1052 end = ptr + hdr.a_text;
|
|
|
1053 write_segment (new, ptr, end);
|
|
|
1054 #endif /* RISCiX */
|
|
|
1055
|
|
|
1056 ptr = (char *) unexec_data_start;
|
|
|
1057 end = ptr + hdr.a_data;
|
|
|
1058 /* This lseek is certainly incorrect when A_TEXT_OFFSET
|
|
|
1059 and I believe it is a no-op otherwise.
|
|
|
1060 Let's see if its absence ever fails. */
|
|
|
1061 /* lseek (new, (long) N_TXTOFF (hdr) + hdr.a_text, 0); */
|
|
|
1062 write_segment (new, ptr, end);
|
|
|
1063
|
|
|
1064 #endif /* not COFF */
|
|
|
1065
|
|
|
1066 return 0;
|
|
|
1067 }
|
|
|
1068
|
|
|
1069 static void
|
|
|
1070 write_segment (new, ptr, end)
|
|
|
1071 int new;
|
|
|
1072 char *ptr, *end;
|
|
|
1073 {
|
|
|
1074 int i, nwrite, ret;
|
|
|
1075 #if 0
|
|
|
1076 char buf[80];
|
|
|
1077 #endif
|
|
|
1078 extern int errno;
|
|
|
1079 /* This is the normal amount to write at once.
|
|
|
1080 It is the size of block that NFS uses. */
|
|
|
1081 int writesize = 1 << 13;
|
|
|
1082 int pagesize = getpagesize ();
|
|
|
1083 char zeros[1 << 13];
|
|
|
1084
|
|
|
1085 memset (zeros, 0, sizeof (zeros));
|
|
|
1086
|
|
|
1087 for (i = 0; ptr < end;)
|
|
|
1088 {
|
|
|
1089 /* Distance to next multiple of writesize. */
|
|
|
1090 nwrite = (((int) ptr + writesize) & -writesize) - (int) ptr;
|
|
|
1091 /* But not beyond specified end. */
|
|
|
1092 if (nwrite > end - ptr) nwrite = end - ptr;
|
|
|
1093 ret = write (new, ptr, nwrite);
|
|
|
1094 /* If write gets a page fault, it means we reached
|
|
|
1095 a gap between the old text segment and the old data segment.
|
|
|
1096 This gap has probably been remapped into part of the text segment.
|
|
|
1097 So write zeros for it. */
|
|
|
1098 if (ret == -1
|
|
|
1099 #ifdef EFAULT
|
|
|
1100 && errno == EFAULT
|
|
|
1101 #endif
|
|
|
1102 )
|
|
|
1103 {
|
|
|
1104 /* Write only a page of zeros at once,
|
|
2
|
1105 so that we don't overshoot the start
|
|
0
|
1106 of the valid memory in the old data segment. */
|
|
|
1107 if (nwrite > pagesize)
|
|
|
1108 nwrite = pagesize;
|
|
|
1109 write (new, zeros, nwrite);
|
|
|
1110 }
|
|
|
1111 #if 0 /* Now that we have can ask `write' to write more than a page,
|
|
|
1112 it is legit for write do less than the whole amount specified. */
|
|
|
1113 else if (nwrite != ret)
|
|
|
1114 {
|
|
|
1115 sprintf (buf,
|
|
|
1116 "unexec write failure: addr 0x%lx, fileno %d, size 0x%x, wrote 0x%x, errno %d",
|
|
|
1117 (unsigned long) ptr, new, nwrite, ret, errno);
|
|
|
1118 PERROR (buf);
|
|
|
1119 }
|
|
|
1120 #endif
|
|
|
1121 i += nwrite;
|
|
|
1122 ptr += nwrite;
|
|
|
1123 }
|
|
|
1124 }
|
|
|
1125
|
|
|
1126 /* ****************************************************************
|
|
|
1127 * copy_sym
|
|
|
1128 *
|
|
|
1129 * Copy the relocation information and symbol table from the a.out to the new
|
|
|
1130 */
|
|
|
1131 static int
|
|
|
1132 copy_sym (int new, int a_out, char *a_name, char *new_name)
|
|
|
1133 {
|
|
|
1134 char page[1024];
|
|
|
1135 int n;
|
|
|
1136
|
|
|
1137 if (a_out < 0)
|
|
|
1138 return 0;
|
|
|
1139
|
|
|
1140 #ifdef COFF
|
|
|
1141 if (SYMS_START == 0L)
|
|
|
1142 return 0;
|
|
|
1143 #endif /* COFF */
|
|
|
1144
|
|
|
1145 #ifdef COFF
|
|
|
1146 if (lnnoptr) /* if there is line number info */
|
|
|
1147 lseek (a_out, lnnoptr, 0); /* start copying from there */
|
|
|
1148 else
|
|
|
1149 #endif /* COFF */
|
|
|
1150 lseek (a_out, SYMS_START, 0); /* Position a.out to symtab. */
|
|
|
1151
|
|
|
1152 while ((n = read (a_out, page, sizeof page)) > 0)
|
|
|
1153 {
|
|
|
1154 if (write (new, page, n) != n)
|
|
|
1155 {
|
|
|
1156 PERROR (new_name);
|
|
|
1157 }
|
|
|
1158 }
|
|
|
1159 if (n < 0)
|
|
|
1160 {
|
|
|
1161 PERROR (a_name);
|
|
|
1162 }
|
|
|
1163 return 0;
|
|
|
1164 }
|
|
|
1165
|
|
|
1166 /* ****************************************************************
|
|
|
1167 * mark_x
|
|
|
1168 *
|
|
|
1169 * After successfully building the new a.out, mark it executable
|
|
|
1170 */
|
|
|
1171 static void
|
|
|
1172 mark_x (char *name)
|
|
|
1173 {
|
|
|
1174 struct stat sbuf;
|
|
|
1175 int um;
|
|
|
1176 int new = 0; /* for PERROR */
|
|
|
1177
|
|
|
1178 um = umask (777);
|
|
|
1179 umask (um);
|
|
|
1180 if (stat (name, &sbuf) == -1)
|
|
|
1181 {
|
|
|
1182 PERROR (name);
|
|
|
1183 }
|
|
|
1184 sbuf.st_mode |= 0111 & ~um;
|
|
|
1185 if (chmod (name, sbuf.st_mode) == -1)
|
|
|
1186 PERROR (name);
|
|
|
1187 }
|
|
|
1188
|
|
|
1189 #ifdef COFF
|
|
|
1190 #ifndef COFF_BSD_SYMBOLS
|
|
|
1191
|
|
|
1192 /*
|
|
|
1193 * If the COFF file contains a symbol table and a line number section,
|
|
|
1194 * then any auxiliary entries that have values for x_lnnoptr must
|
|
|
1195 * be adjusted by the amount that the line number section has moved
|
|
|
1196 * in the file (bias computed in make_hdr). The #@$%&* designers of
|
|
|
1197 * the auxiliary entry structures used the absolute file offsets for
|
|
|
1198 * the line number entry rather than an offset from the start of the
|
|
|
1199 * line number section!
|
|
|
1200 *
|
|
|
1201 * When I figure out how to scan through the symbol table and pick out
|
|
|
1202 * the auxiliary entries that need adjustment, this routine will
|
|
|
1203 * be fixed. As it is now, all such entries are wrong and sdb
|
|
|
1204 * will complain. Fred Fish, UniSoft Systems Inc.
|
|
|
1205 */
|
|
|
1206
|
|
|
1207 /* This function is probably very slow. Instead of reopening the new
|
|
|
1208 file for input and output it should copy from the old to the new
|
|
|
1209 using the two descriptors already open (WRITEDESC and READDESC).
|
|
|
1210 Instead of reading one small structure at a time it should use
|
|
|
1211 a reasonable size buffer. But I don't have time to work on such
|
|
|
1212 things, so I am installing it as submitted to me. -- RMS. */
|
|
|
1213
|
|
|
1214 int
|
|
|
1215 adjust_lnnoptrs (writedesc, readdesc, new_name)
|
|
|
1216 int writedesc;
|
|
|
1217 int readdesc;
|
|
|
1218 char *new_name;
|
|
|
1219 {
|
|
|
1220 int nsyms;
|
|
|
1221 int new;
|
|
|
1222 #if defined (amdahl_uts) || defined (pfa)
|
|
|
1223 SYMENT symentry;
|
|
|
1224 AUXENT auxentry;
|
|
|
1225 #else
|
|
|
1226 struct syment symentry;
|
|
|
1227 union auxent auxentry;
|
|
|
1228 #endif
|
|
|
1229
|
|
|
1230 if (!lnnoptr || !f_hdr.f_symptr)
|
|
|
1231 return 0;
|
|
|
1232
|
|
|
1233 #ifdef MSDOS
|
|
|
1234 if ((new = writedesc) < 0)
|
|
|
1235 #else
|
|
|
1236 if ((new = open (new_name, O_RDWR)) < 0)
|
|
|
1237 #endif
|
|
|
1238 {
|
|
|
1239 PERROR (new_name);
|
|
|
1240 return -1;
|
|
|
1241 }
|
|
|
1242
|
|
|
1243 lseek (new, f_hdr.f_symptr, 0);
|
|
|
1244 for (nsyms = 0; nsyms < f_hdr.f_nsyms; nsyms++)
|
|
|
1245 {
|
|
|
1246 read (new, &symentry, SYMESZ);
|
|
|
1247 if (symentry.n_numaux)
|
|
|
1248 {
|
|
|
1249 read (new, &auxentry, AUXESZ);
|
|
|
1250 nsyms++;
|
|
|
1251 if (ISFCN (symentry.n_type) || symentry.n_type == 0x2400)
|
|
|
1252 {
|
|
|
1253 auxentry.x_sym.x_fcnary.x_fcn.x_lnnoptr += bias;
|
|
|
1254 lseek (new, -AUXESZ, 1);
|
|
|
1255 write (new, &auxentry, AUXESZ);
|
|
|
1256 }
|
|
|
1257 }
|
|
|
1258 }
|
|
|
1259 #ifndef MSDOS
|
|
|
1260 close (new);
|
|
|
1261 #endif
|
|
|
1262 return 0;
|
|
|
1263 }
|
|
|
1264
|
|
|
1265 #endif /* COFF_BSD_SYMBOLS */
|
|
|
1266
|
|
|
1267 #endif /* COFF */
|
|
|
1268
|
|
|
1269 #endif /* not CANNOT_DUMP */
|
