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3a22ee35 | 1 | /* Copyright (C) 1985,86,87,88,92,93,94 Free Software Foundation, Inc. |
7dd63af1 RS |
2 | |
3 | This file is part of GNU Emacs. | |
4 | ||
5 | GNU Emacs is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
f31fe472 | 7 | the Free Software Foundation; either version 2, or (at your option) |
7dd63af1 RS |
8 | any later version. |
9 | ||
10 | GNU Emacs is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with GNU Emacs; see the file COPYING. If not, write to | |
3b7ad313 EN |
17 | the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
18 | Boston, MA 02111-1307, USA. */ | |
7dd63af1 RS |
19 | |
20 | ||
21 | /* | |
22 | * unexec.c - Convert a running program into an a.out file. | |
23 | * | |
24 | * Author: Spencer W. Thomas | |
25 | * Computer Science Dept. | |
26 | * University of Utah | |
27 | * Date: Tue Mar 2 1982 | |
28 | * Modified heavily since then. | |
29 | * | |
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; | |
34 | * | |
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. | |
39 | * | |
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. | |
42 | * | |
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. | |
49 | * | |
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. | |
54 | * | |
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). | |
61 | * | |
62 | * The new file is set up to start at entry_address. | |
63 | * | |
64 | * If you make improvements I'd like to get them too. | |
65 | * harpo!utah-cs!thomas, thomas@Utah-20 | |
66 | * | |
67 | */ | |
68 | ||
69 | /* Modified to support SysVr3 shared libraries by James Van Artsdalen | |
70 | * of Dell Computer Corporation. james@bigtex.cactus.org. | |
71 | */ | |
72 | ||
73 | /* There are several compilation parameters affecting unexec: | |
74 | ||
75 | * COFF | |
76 | ||
77 | Define this if your system uses COFF for executables. | |
265a9e55 JB |
78 | |
79 | * COFF_ENCAPSULATE | |
80 | ||
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 | |
84 | ||
7dd63af1 RS |
85 | Otherwise we assume you use Berkeley format. |
86 | ||
87 | * NO_REMAP | |
88 | ||
89 | Define this if you do not want to try to save Emacs's pure data areas | |
90 | as part of the text segment. | |
91 | ||
92 | Saving them as text is good because it allows users to share more. | |
93 | ||
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. | |
97 | ||
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. | |
103 | ||
104 | * SECTION_ALIGNMENT | |
105 | ||
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. | |
111 | ||
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. | |
115 | ||
116 | * SEGMENT_MASK | |
117 | ||
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. | |
123 | ||
124 | * A_TEXT_OFFSET(HDR) | |
125 | ||
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. | |
130 | ||
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. | |
137 | ||
138 | * A_TEXT_SEEK(HDR) | |
139 | ||
140 | If defined, this macro specifies the number of bytes to seek into the | |
2d30a233 | 141 | a.out file before starting to write the text segment. |
7dd63af1 RS |
142 | |
143 | * EXEC_MAGIC | |
144 | ||
145 | For machines using COFF, this macro, if defined, is a value stored | |
146 | into the magic number field of the output file. | |
147 | ||
148 | * ADJUST_EXEC_HEADER | |
149 | ||
150 | This macro can be used to generate statements to adjust or | |
151 | initialize nonstandard fields in the file header | |
152 | ||
153 | * ADDR_CORRECT(ADDR) | |
154 | ||
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. | |
157 | ||
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. | |
161 | ||
162 | */ | |
163 | ||
164 | #ifndef emacs | |
165 | #define PERROR(arg) perror (arg); return -1 | |
166 | #else | |
167 | #define IN_UNEXEC | |
18160b98 | 168 | #include <config.h> |
7dd63af1 RS |
169 | #define PERROR(file) report_error (file, new) |
170 | #endif | |
171 | ||
172 | #ifndef CANNOT_DUMP /* all rest of file! */ | |
173 | ||
077907d4 | 174 | #if defined(COFF) && defined(HAVE_COFF_H) |
2a4487ac | 175 | #include <coff.h> |
3680bdc6 | 176 | #ifdef MSDOS |
8eb2807f RS |
177 | #if __DJGPP__ > 1 |
178 | #include <fcntl.h> /* for O_RDONLY, O_RDWR */ | |
c17a2102 KH |
179 | #include <crt0.h> /* for _crt0_startup_flags and its bits */ |
180 | static int save_djgpp_startup_flags; | |
8d228cb0 | 181 | #endif /* __DJGPP__ > 1 */ |
3680bdc6 RS |
182 | #define filehdr external_filehdr |
183 | #define scnhdr external_scnhdr | |
184 | #define syment external_syment | |
185 | #define auxent external_auxent | |
186 | #define n_numaux e_numaux | |
187 | #define n_type e_type | |
188 | struct aouthdr | |
189 | { | |
234d3183 RS |
190 | unsigned short magic; /* type of file */ |
191 | unsigned short vstamp; /* version stamp */ | |
192 | unsigned long tsize; /* text size in bytes, padded to FW bdry*/ | |
193 | unsigned long dsize; /* initialized data " " */ | |
194 | unsigned long bsize; /* uninitialized data " " */ | |
195 | unsigned long entry; /* entry pt. */ | |
196 | unsigned long text_start;/* base of text used for this file */ | |
197 | unsigned long data_start;/* base of data used for this file */ | |
3680bdc6 | 198 | }; |
3680bdc6 | 199 | #endif /* not MSDOS */ |
8d228cb0 EZ |
200 | #else /* not COFF */ |
201 | #ifdef COFF_ENCAPSULATE | |
202 | int need_coff_header = 1; | |
203 | #include <coff-encap/a.out.encap.h> /* The location might be a poor assumption */ | |
204 | #else /* not COFF_ENCAPSULATE */ | |
205 | #include <a.out.h> | |
206 | #endif /* not COFF_ENCAPSULATE */ | |
2a4487ac | 207 | #endif /* not COFF */ |
265a9e55 | 208 | |
f34e2e18 RS |
209 | /* Define getpagesize if the system does not. |
210 | Note that this may depend on symbols defined in a.out.h. */ | |
7dd63af1 RS |
211 | #include "getpagesize.h" |
212 | ||
213 | #ifndef makedev /* Try to detect types.h already loaded */ | |
214 | #include <sys/types.h> | |
265a9e55 | 215 | #endif /* makedev */ |
7dd63af1 RS |
216 | #include <stdio.h> |
217 | #include <sys/stat.h> | |
218 | #include <errno.h> | |
219 | ||
2d30a233 RM |
220 | #include <sys/file.h> /* Must be after sys/types.h for USG and BSD4_1*/ |
221 | ||
222 | #ifdef USG5 | |
223 | #include <fcntl.h> | |
224 | #endif | |
225 | ||
226 | #ifndef O_RDONLY | |
227 | #define O_RDONLY 0 | |
228 | #endif | |
229 | #ifndef O_RDWR | |
230 | #define O_RDWR 2 | |
231 | #endif | |
232 | ||
233 | ||
7dd63af1 RS |
234 | extern char *start_of_text (); /* Start of text */ |
235 | extern char *start_of_data (); /* Start of initialized data */ | |
236 | ||
237 | #ifdef COFF | |
238 | static long block_copy_start; /* Old executable start point */ | |
239 | static struct filehdr f_hdr; /* File header */ | |
240 | static struct aouthdr f_ohdr; /* Optional file header (a.out) */ | |
241 | long bias; /* Bias to add for growth */ | |
242 | long lnnoptr; /* Pointer to line-number info within file */ | |
243 | #define SYMS_START block_copy_start | |
244 | ||
245 | static long text_scnptr; | |
246 | static long data_scnptr; | |
247 | ||
c8b14b5f RS |
248 | static long coff_offset; |
249 | ||
7dd63af1 RS |
250 | #else /* not COFF */ |
251 | ||
83cb209c JB |
252 | #ifdef HPUX |
253 | extern void *sbrk (); | |
254 | #else | |
f31fe472 RM |
255 | #if 0 |
256 | /* Some systems with __STDC__ compilers still declare this `char *' in some | |
257 | header file, and our declaration conflicts. The return value is always | |
258 | cast, so it should be harmless to leave it undefined. Hopefully | |
259 | machines with different size pointers and ints declare sbrk in a header | |
260 | file. */ | |
d4327fec JB |
261 | #ifdef __STDC__ |
262 | extern void *sbrk (); | |
263 | #else | |
7dd63af1 | 264 | extern char *sbrk (); |
83cb209c | 265 | #endif /* __STDC__ */ |
f31fe472 | 266 | #endif |
83cb209c | 267 | #endif /* HPUX */ |
7dd63af1 RS |
268 | |
269 | #define SYMS_START ((long) N_SYMOFF (ohdr)) | |
270 | ||
271 | /* Some machines override the structure name for an a.out header. */ | |
272 | #ifndef EXEC_HDR_TYPE | |
273 | #define EXEC_HDR_TYPE struct exec | |
274 | #endif | |
275 | ||
276 | #ifdef HPUX | |
277 | #ifdef HP9000S200_ID | |
278 | #define MY_ID HP9000S200_ID | |
279 | #else | |
280 | #include <model.h> | |
281 | #define MY_ID MYSYS | |
282 | #endif /* no HP9000S200_ID */ | |
283 | static MAGIC OLDMAGIC = {MY_ID, SHARE_MAGIC}; | |
284 | static MAGIC NEWMAGIC = {MY_ID, DEMAND_MAGIC}; | |
285 | #define N_TXTOFF(x) TEXT_OFFSET(x) | |
286 | #define N_SYMOFF(x) LESYM_OFFSET(x) | |
287 | static EXEC_HDR_TYPE hdr, ohdr; | |
288 | ||
289 | #else /* not HPUX */ | |
290 | ||
34e39c95 | 291 | #if defined (USG) && !defined (IBMAIX) && !defined (IRIS) && !defined (COFF_ENCAPSULATE) && !defined (GNU_LINUX) |
7dd63af1 RS |
292 | static struct bhdr hdr, ohdr; |
293 | #define a_magic fmagic | |
294 | #define a_text tsize | |
295 | #define a_data dsize | |
296 | #define a_bss bsize | |
297 | #define a_syms ssize | |
298 | #define a_trsize rtsize | |
299 | #define a_drsize rdsize | |
300 | #define a_entry entry | |
301 | #define N_BADMAG(x) \ | |
302 | (((x).fmagic)!=OMAGIC && ((x).fmagic)!=NMAGIC &&\ | |
303 | ((x).fmagic)!=FMAGIC && ((x).fmagic)!=IMAGIC) | |
304 | #define NEWMAGIC FMAGIC | |
305 | #else /* IRIS or IBMAIX or not USG */ | |
306 | static EXEC_HDR_TYPE hdr, ohdr; | |
307 | #define NEWMAGIC ZMAGIC | |
308 | #endif /* IRIS or IBMAIX not USG */ | |
309 | #endif /* not HPUX */ | |
310 | ||
311 | static int unexec_text_start; | |
312 | static int unexec_data_start; | |
313 | ||
265a9e55 JB |
314 | #ifdef COFF_ENCAPSULATE |
315 | /* coffheader is defined in the GNU a.out.encap.h file. */ | |
316 | struct coffheader coffheader; | |
317 | #endif | |
318 | ||
7dd63af1 RS |
319 | #endif /* not COFF */ |
320 | ||
321 | static int pagemask; | |
322 | ||
323 | /* Correct an int which is the bit pattern of a pointer to a byte | |
324 | into an int which is the number of a byte. | |
325 | This is a no-op on ordinary machines, but not on all. */ | |
326 | ||
327 | #ifndef ADDR_CORRECT /* Let m-*.h files override this definition */ | |
328 | #define ADDR_CORRECT(x) ((char *)(x) - (char*)0) | |
329 | #endif | |
330 | ||
331 | #ifdef emacs | |
332 | ||
2d30a233 RM |
333 | #include "lisp.h" |
334 | ||
7dd63af1 RS |
335 | static |
336 | report_error (file, fd) | |
337 | char *file; | |
338 | int fd; | |
339 | { | |
340 | if (fd) | |
341 | close (fd); | |
2d30a233 | 342 | report_file_error ("Cannot unexec", Fcons (build_string (file), Qnil)); |
7dd63af1 RS |
343 | } |
344 | #endif /* emacs */ | |
345 | ||
346 | #define ERROR0(msg) report_error_1 (new, msg, 0, 0); return -1 | |
347 | #define ERROR1(msg,x) report_error_1 (new, msg, x, 0); return -1 | |
348 | #define ERROR2(msg,x,y) report_error_1 (new, msg, x, y); return -1 | |
349 | ||
350 | static | |
351 | report_error_1 (fd, msg, a1, a2) | |
352 | int fd; | |
353 | char *msg; | |
354 | int a1, a2; | |
355 | { | |
356 | close (fd); | |
357 | #ifdef emacs | |
358 | error (msg, a1, a2); | |
359 | #else | |
360 | fprintf (stderr, msg, a1, a2); | |
361 | fprintf (stderr, "\n"); | |
362 | #endif | |
363 | } | |
364 | \f | |
365 | static int make_hdr (); | |
366 | static int copy_text_and_data (); | |
367 | static int copy_sym (); | |
368 | static void mark_x (); | |
369 | ||
370 | /* **************************************************************** | |
371 | * unexec | |
372 | * | |
373 | * driving logic. | |
374 | */ | |
375 | unexec (new_name, a_name, data_start, bss_start, entry_address) | |
376 | char *new_name, *a_name; | |
377 | unsigned data_start, bss_start, entry_address; | |
378 | { | |
379 | int new, a_out = -1; | |
380 | ||
2d30a233 | 381 | if (a_name && (a_out = open (a_name, O_RDONLY)) < 0) |
7dd63af1 RS |
382 | { |
383 | PERROR (a_name); | |
384 | } | |
385 | if ((new = creat (new_name, 0666)) < 0) | |
386 | { | |
387 | PERROR (new_name); | |
388 | } | |
389 | ||
390 | if (make_hdr (new, a_out, data_start, bss_start, entry_address, a_name, new_name) < 0 | |
391 | || copy_text_and_data (new, a_out) < 0 | |
392 | || copy_sym (new, a_out, a_name, new_name) < 0 | |
393 | #ifdef COFF | |
394 | #ifndef COFF_BSD_SYMBOLS | |
395 | || adjust_lnnoptrs (new, a_out, new_name) < 0 | |
396 | #endif | |
397 | #endif | |
398 | ) | |
399 | { | |
400 | close (new); | |
401 | /* unlink (new_name); /* Failed, unlink new a.out */ | |
402 | return -1; | |
403 | } | |
404 | ||
405 | close (new); | |
406 | if (a_out >= 0) | |
407 | close (a_out); | |
408 | mark_x (new_name); | |
409 | return 0; | |
410 | } | |
411 | ||
412 | /* **************************************************************** | |
413 | * make_hdr | |
414 | * | |
415 | * Make the header in the new a.out from the header in core. | |
416 | * Modify the text and data sizes. | |
417 | */ | |
418 | static int | |
419 | make_hdr (new, a_out, data_start, bss_start, entry_address, a_name, new_name) | |
420 | int new, a_out; | |
421 | unsigned data_start, bss_start, entry_address; | |
422 | char *a_name; | |
423 | char *new_name; | |
424 | { | |
425 | int tem; | |
426 | #ifdef COFF | |
427 | auto struct scnhdr f_thdr; /* Text section header */ | |
428 | auto struct scnhdr f_dhdr; /* Data section header */ | |
429 | auto struct scnhdr f_bhdr; /* Bss section header */ | |
430 | auto struct scnhdr scntemp; /* Temporary section header */ | |
431 | register int scns; | |
432 | #endif /* COFF */ | |
433 | #ifdef USG_SHARED_LIBRARIES | |
434 | extern unsigned int bss_end; | |
435 | #else | |
436 | unsigned int bss_end; | |
437 | #endif | |
438 | ||
439 | pagemask = getpagesize () - 1; | |
440 | ||
441 | /* Adjust text/data boundary. */ | |
442 | #ifdef NO_REMAP | |
443 | data_start = (int) start_of_data (); | |
444 | #else /* not NO_REMAP */ | |
445 | if (!data_start) | |
446 | data_start = (int) start_of_data (); | |
447 | #endif /* not NO_REMAP */ | |
448 | data_start = ADDR_CORRECT (data_start); | |
449 | ||
450 | #ifdef SEGMENT_MASK | |
451 | data_start = data_start & ~SEGMENT_MASK; /* (Down) to segment boundary. */ | |
452 | #else | |
453 | data_start = data_start & ~pagemask; /* (Down) to page boundary. */ | |
454 | #endif | |
455 | ||
456 | bss_end = ADDR_CORRECT (sbrk (0)) + pagemask; | |
457 | bss_end &= ~ pagemask; | |
458 | ||
459 | /* Adjust data/bss boundary. */ | |
460 | if (bss_start != 0) | |
461 | { | |
462 | bss_start = (ADDR_CORRECT (bss_start) + pagemask); | |
463 | /* (Up) to page bdry. */ | |
464 | bss_start &= ~ pagemask; | |
465 | if (bss_start > bss_end) | |
466 | { | |
467 | ERROR1 ("unexec: Specified bss_start (%u) is past end of program", | |
468 | bss_start); | |
469 | } | |
470 | } | |
471 | else | |
472 | bss_start = bss_end; | |
473 | ||
474 | if (data_start > bss_start) /* Can't have negative data size. */ | |
475 | { | |
476 | ERROR2 ("unexec: data_start (%u) can't be greater than bss_start (%u)", | |
477 | data_start, bss_start); | |
478 | } | |
479 | ||
480 | #ifdef COFF | |
c8b14b5f RS |
481 | coff_offset = 0L; /* stays zero, except in DJGPP */ |
482 | ||
7dd63af1 RS |
483 | /* Salvage as much info from the existing file as possible */ |
484 | if (a_out >= 0) | |
485 | { | |
c8b14b5f RS |
486 | #ifdef MSDOS |
487 | #if __DJGPP__ > 1 | |
488 | /* Support the coff-go32-exe format with a prepended stub, since | |
489 | this is what GCC 2.8.0 and later generates by default in DJGPP. */ | |
490 | unsigned short mz_header[3]; | |
491 | ||
492 | if (read (a_out, &mz_header, sizeof (mz_header)) != sizeof (mz_header)) | |
493 | { | |
494 | PERROR (a_name); | |
495 | } | |
496 | if (mz_header[0] == 0x5a4d || mz_header[0] == 0x4d5a) /* "MZ" or "ZM" */ | |
497 | { | |
498 | coff_offset = (long)mz_header[2] * 512L; | |
499 | if (mz_header[1]) | |
500 | coff_offset += (long)mz_header[1] - 512L; | |
501 | lseek (a_out, coff_offset, 0); | |
502 | } | |
503 | else | |
504 | lseek (a_out, 0L, 0); | |
505 | #endif /* __DJGPP__ > 1 */ | |
506 | #endif /* MSDOS */ | |
7dd63af1 RS |
507 | if (read (a_out, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) |
508 | { | |
509 | PERROR (a_name); | |
510 | } | |
511 | block_copy_start += sizeof (f_hdr); | |
512 | if (f_hdr.f_opthdr > 0) | |
513 | { | |
514 | if (read (a_out, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) | |
515 | { | |
516 | PERROR (a_name); | |
517 | } | |
518 | block_copy_start += sizeof (f_ohdr); | |
519 | } | |
520 | /* Loop through section headers, copying them in */ | |
c8b14b5f | 521 | lseek (a_out, coff_offset + sizeof (f_hdr) + f_hdr.f_opthdr, 0); |
7dd63af1 RS |
522 | for (scns = f_hdr.f_nscns; scns > 0; scns--) { |
523 | if (read (a_out, &scntemp, sizeof (scntemp)) != sizeof (scntemp)) | |
524 | { | |
525 | PERROR (a_name); | |
526 | } | |
527 | if (scntemp.s_scnptr > 0L) | |
528 | { | |
529 | if (block_copy_start < scntemp.s_scnptr + scntemp.s_size) | |
530 | block_copy_start = scntemp.s_scnptr + scntemp.s_size; | |
531 | } | |
532 | if (strcmp (scntemp.s_name, ".text") == 0) | |
533 | { | |
534 | f_thdr = scntemp; | |
535 | } | |
536 | else if (strcmp (scntemp.s_name, ".data") == 0) | |
537 | { | |
538 | f_dhdr = scntemp; | |
539 | } | |
540 | else if (strcmp (scntemp.s_name, ".bss") == 0) | |
541 | { | |
542 | f_bhdr = scntemp; | |
543 | } | |
544 | } | |
545 | } | |
546 | else | |
547 | { | |
548 | ERROR0 ("can't build a COFF file from scratch yet"); | |
549 | } | |
550 | ||
551 | /* Now we alter the contents of all the f_*hdr variables | |
552 | to correspond to what we want to dump. */ | |
553 | ||
554 | #ifdef USG_SHARED_LIBRARIES | |
555 | ||
556 | /* The amount of data we're adding to the file is distance from the | |
557 | * end of the original .data space to the current end of the .data | |
558 | * space. | |
559 | */ | |
560 | ||
1ba3de00 | 561 | bias = bss_start - (f_ohdr.data_start + f_dhdr.s_size); |
7dd63af1 RS |
562 | |
563 | #endif | |
564 | ||
565 | f_hdr.f_flags |= (F_RELFLG | F_EXEC); | |
566 | #ifdef TPIX | |
567 | f_hdr.f_nscns = 3; | |
568 | #endif | |
569 | #ifdef EXEC_MAGIC | |
570 | f_ohdr.magic = EXEC_MAGIC; | |
571 | #endif | |
572 | #ifndef NO_REMAP | |
573 | f_ohdr.text_start = (long) start_of_text (); | |
574 | f_ohdr.tsize = data_start - f_ohdr.text_start; | |
575 | f_ohdr.data_start = data_start; | |
576 | #endif /* NO_REMAP */ | |
577 | f_ohdr.dsize = bss_start - f_ohdr.data_start; | |
578 | f_ohdr.bsize = bss_end - bss_start; | |
579 | #ifndef KEEP_OLD_TEXT_SCNPTR | |
580 | /* On some machines, the old values are right. | |
581 | ??? Maybe on all machines with NO_REMAP. */ | |
582 | f_thdr.s_size = f_ohdr.tsize; | |
583 | f_thdr.s_scnptr = sizeof (f_hdr) + sizeof (f_ohdr); | |
584 | f_thdr.s_scnptr += (f_hdr.f_nscns) * (sizeof (f_thdr)); | |
585 | #endif /* KEEP_OLD_TEXT_SCNPTR */ | |
586 | #ifdef ADJUST_TEXT_SCNHDR_SIZE | |
587 | /* On some machines, `text size' includes all headers. */ | |
588 | f_thdr.s_size -= f_thdr.s_scnptr; | |
589 | #endif /* ADJUST_TEST_SCNHDR_SIZE */ | |
590 | lnnoptr = f_thdr.s_lnnoptr; | |
591 | #ifdef SECTION_ALIGNMENT | |
592 | /* Some systems require special alignment | |
593 | of the sections in the file itself. */ | |
594 | f_thdr.s_scnptr | |
595 | = (f_thdr.s_scnptr + SECTION_ALIGNMENT) & ~SECTION_ALIGNMENT; | |
596 | #endif /* SECTION_ALIGNMENT */ | |
597 | #ifdef TPIX | |
598 | f_thdr.s_scnptr = 0xd0; | |
599 | #endif | |
600 | text_scnptr = f_thdr.s_scnptr; | |
601 | #ifdef ADJUST_TEXTBASE | |
602 | text_scnptr = sizeof (f_hdr) + sizeof (f_ohdr) + (f_hdr.f_nscns) * (sizeof (f_thdr)); | |
603 | #endif | |
604 | #ifndef KEEP_OLD_PADDR | |
605 | f_dhdr.s_paddr = f_ohdr.data_start; | |
606 | #endif /* KEEP_OLD_PADDR */ | |
607 | f_dhdr.s_vaddr = f_ohdr.data_start; | |
608 | f_dhdr.s_size = f_ohdr.dsize; | |
609 | f_dhdr.s_scnptr = f_thdr.s_scnptr + f_thdr.s_size; | |
610 | #ifdef SECTION_ALIGNMENT | |
611 | /* Some systems require special alignment | |
612 | of the sections in the file itself. */ | |
613 | f_dhdr.s_scnptr | |
614 | = (f_dhdr.s_scnptr + SECTION_ALIGNMENT) & ~SECTION_ALIGNMENT; | |
615 | #endif /* SECTION_ALIGNMENT */ | |
616 | #ifdef DATA_SECTION_ALIGNMENT | |
617 | /* Some systems require special alignment | |
618 | of the data section only. */ | |
619 | f_dhdr.s_scnptr | |
620 | = (f_dhdr.s_scnptr + DATA_SECTION_ALIGNMENT) & ~DATA_SECTION_ALIGNMENT; | |
621 | #endif /* DATA_SECTION_ALIGNMENT */ | |
622 | data_scnptr = f_dhdr.s_scnptr; | |
623 | #ifndef KEEP_OLD_PADDR | |
624 | f_bhdr.s_paddr = f_ohdr.data_start + f_ohdr.dsize; | |
625 | #endif /* KEEP_OLD_PADDR */ | |
626 | f_bhdr.s_vaddr = f_ohdr.data_start + f_ohdr.dsize; | |
627 | f_bhdr.s_size = f_ohdr.bsize; | |
628 | f_bhdr.s_scnptr = 0L; | |
629 | #ifndef USG_SHARED_LIBRARIES | |
630 | bias = f_dhdr.s_scnptr + f_dhdr.s_size - block_copy_start; | |
631 | #endif | |
632 | ||
633 | if (f_hdr.f_symptr > 0L) | |
634 | { | |
635 | f_hdr.f_symptr += bias; | |
636 | } | |
637 | ||
638 | if (f_thdr.s_lnnoptr > 0L) | |
639 | { | |
640 | f_thdr.s_lnnoptr += bias; | |
641 | } | |
642 | ||
643 | #ifdef ADJUST_EXEC_HEADER | |
644 | ADJUST_EXEC_HEADER; | |
645 | #endif /* ADJUST_EXEC_HEADER */ | |
646 | ||
647 | if (write (new, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) | |
648 | { | |
649 | PERROR (new_name); | |
650 | } | |
651 | ||
652 | if (write (new, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) | |
653 | { | |
654 | PERROR (new_name); | |
655 | } | |
656 | ||
657 | #ifndef USG_SHARED_LIBRARIES | |
658 | ||
659 | if (write (new, &f_thdr, sizeof (f_thdr)) != sizeof (f_thdr)) | |
660 | { | |
661 | PERROR (new_name); | |
662 | } | |
663 | ||
664 | if (write (new, &f_dhdr, sizeof (f_dhdr)) != sizeof (f_dhdr)) | |
665 | { | |
666 | PERROR (new_name); | |
667 | } | |
668 | ||
669 | if (write (new, &f_bhdr, sizeof (f_bhdr)) != sizeof (f_bhdr)) | |
670 | { | |
671 | PERROR (new_name); | |
672 | } | |
673 | ||
674 | #else /* USG_SHARED_LIBRARIES */ | |
675 | ||
676 | /* The purpose of this code is to write out the new file's section | |
677 | * header table. | |
678 | * | |
679 | * Scan through the original file's sections. If the encountered | |
680 | * section is one we know (.text, .data or .bss), write out the | |
681 | * correct header. If it is a section we do not know (such as | |
682 | * .lib), adjust the address of where the section data is in the | |
683 | * file, and write out the header. | |
684 | * | |
eb8c3be9 | 685 | * If any section precedes .text or .data in the file, this code |
7dd63af1 RS |
686 | * will not adjust the file pointer for that section correctly. |
687 | */ | |
688 | ||
dcceb381 RS |
689 | /* This used to use sizeof (f_ohdr) instead of .f_opthdr. |
690 | .f_opthdr is said to be right when there is no optional header. */ | |
691 | lseek (a_out, sizeof (f_hdr) + f_hdr.f_opthdr, 0); | |
7dd63af1 RS |
692 | |
693 | for (scns = f_hdr.f_nscns; scns > 0; scns--) | |
694 | { | |
695 | if (read (a_out, &scntemp, sizeof (scntemp)) != sizeof (scntemp)) | |
696 | PERROR (a_name); | |
697 | ||
698 | if (!strcmp (scntemp.s_name, f_thdr.s_name)) /* .text */ | |
699 | { | |
700 | if (write (new, &f_thdr, sizeof (f_thdr)) != sizeof (f_thdr)) | |
701 | PERROR (new_name); | |
702 | } | |
703 | else if (!strcmp (scntemp.s_name, f_dhdr.s_name)) /* .data */ | |
704 | { | |
705 | if (write (new, &f_dhdr, sizeof (f_dhdr)) != sizeof (f_dhdr)) | |
706 | PERROR (new_name); | |
707 | } | |
708 | else if (!strcmp (scntemp.s_name, f_bhdr.s_name)) /* .bss */ | |
709 | { | |
710 | if (write (new, &f_bhdr, sizeof (f_bhdr)) != sizeof (f_bhdr)) | |
711 | PERROR (new_name); | |
712 | } | |
713 | else | |
714 | { | |
715 | if (scntemp.s_scnptr) | |
716 | scntemp.s_scnptr += bias; | |
717 | if (write (new, &scntemp, sizeof (scntemp)) != sizeof (scntemp)) | |
718 | PERROR (new_name); | |
719 | } | |
720 | } | |
721 | #endif /* USG_SHARED_LIBRARIES */ | |
722 | ||
723 | return (0); | |
724 | ||
725 | #else /* if not COFF */ | |
726 | ||
727 | /* Get symbol table info from header of a.out file if given one. */ | |
728 | if (a_out >= 0) | |
729 | { | |
265a9e55 JB |
730 | #ifdef COFF_ENCAPSULATE |
731 | if (read (a_out, &coffheader, sizeof coffheader) != sizeof coffheader) | |
732 | { | |
733 | PERROR(a_name); | |
734 | } | |
735 | if (coffheader.f_magic != COFF_MAGIC) | |
736 | { | |
737 | ERROR1("%s doesn't have legal coff magic number\n", a_name); | |
738 | } | |
739 | #endif | |
7dd63af1 RS |
740 | if (read (a_out, &ohdr, sizeof hdr) != sizeof hdr) |
741 | { | |
742 | PERROR (a_name); | |
743 | } | |
744 | ||
745 | if (N_BADMAG (ohdr)) | |
746 | { | |
747 | ERROR1 ("invalid magic number in %s", a_name); | |
748 | } | |
749 | hdr = ohdr; | |
750 | } | |
751 | else | |
752 | { | |
265a9e55 JB |
753 | #ifdef COFF_ENCAPSULATE |
754 | /* We probably could without too much trouble. The code is in gld | |
755 | * but I don't have that much time or incentive. | |
756 | */ | |
757 | ERROR0 ("can't build a COFF file from scratch yet"); | |
3680bdc6 RS |
758 | #else |
759 | #ifdef MSDOS /* Demacs 1.1.1 91/10/16 HIRANO Satoshi */ | |
760 | bzero ((void *)&hdr, sizeof hdr); | |
265a9e55 | 761 | #else |
a5fd213f | 762 | bzero (&hdr, sizeof hdr); |
3680bdc6 | 763 | #endif |
265a9e55 | 764 | #endif |
7dd63af1 RS |
765 | } |
766 | ||
767 | unexec_text_start = (long) start_of_text (); | |
768 | unexec_data_start = data_start; | |
769 | ||
770 | /* Machine-dependent fixup for header, or maybe for unexec_text_start */ | |
771 | #ifdef ADJUST_EXEC_HEADER | |
772 | ADJUST_EXEC_HEADER; | |
773 | #endif /* ADJUST_EXEC_HEADER */ | |
774 | ||
775 | hdr.a_trsize = 0; | |
776 | hdr.a_drsize = 0; | |
777 | if (entry_address != 0) | |
778 | hdr.a_entry = entry_address; | |
779 | ||
780 | hdr.a_bss = bss_end - bss_start; | |
781 | hdr.a_data = bss_start - data_start; | |
782 | #ifdef NO_REMAP | |
783 | hdr.a_text = ohdr.a_text; | |
784 | #else /* not NO_REMAP */ | |
785 | hdr.a_text = data_start - unexec_text_start; | |
786 | ||
787 | #ifdef A_TEXT_OFFSET | |
788 | hdr.a_text += A_TEXT_OFFSET (ohdr); | |
789 | #endif | |
790 | ||
791 | #endif /* not NO_REMAP */ | |
792 | ||
265a9e55 JB |
793 | #ifdef COFF_ENCAPSULATE |
794 | /* We are encapsulating BSD format within COFF format. */ | |
795 | { | |
796 | struct coffscn *tp, *dp, *bp; | |
797 | tp = &coffheader.scns[0]; | |
798 | dp = &coffheader.scns[1]; | |
799 | bp = &coffheader.scns[2]; | |
800 | tp->s_size = hdr.a_text + sizeof(struct exec); | |
801 | dp->s_paddr = data_start; | |
802 | dp->s_vaddr = data_start; | |
803 | dp->s_size = hdr.a_data; | |
804 | bp->s_paddr = dp->s_vaddr + dp->s_size; | |
805 | bp->s_vaddr = bp->s_paddr; | |
806 | bp->s_size = hdr.a_bss; | |
807 | coffheader.tsize = tp->s_size; | |
808 | coffheader.dsize = dp->s_size; | |
809 | coffheader.bsize = bp->s_size; | |
810 | coffheader.text_start = tp->s_vaddr; | |
811 | coffheader.data_start = dp->s_vaddr; | |
812 | } | |
813 | if (write (new, &coffheader, sizeof coffheader) != sizeof coffheader) | |
814 | { | |
815 | PERROR(new_name); | |
816 | } | |
817 | #endif /* COFF_ENCAPSULATE */ | |
818 | ||
7dd63af1 RS |
819 | if (write (new, &hdr, sizeof hdr) != sizeof hdr) |
820 | { | |
821 | PERROR (new_name); | |
822 | } | |
823 | ||
4baa8a83 | 824 | #if 0 /* This #ifndef caused a bug on Linux when using QMAGIC. */ |
2d30a233 RM |
825 | /* This adjustment was done above only #ifndef NO_REMAP, |
826 | so only undo it now #ifndef NO_REMAP. */ | |
4baa8a83 RS |
827 | /* #ifndef NO_REMAP */ |
828 | #endif | |
7dd63af1 RS |
829 | #ifdef A_TEXT_OFFSET |
830 | hdr.a_text -= A_TEXT_OFFSET (ohdr); | |
831 | #endif | |
832 | ||
833 | return 0; | |
834 | ||
835 | #endif /* not COFF */ | |
836 | } | |
837 | \f | |
838 | /* **************************************************************** | |
839 | * copy_text_and_data | |
840 | * | |
841 | * Copy the text and data segments from memory to the new a.out | |
842 | */ | |
843 | static int | |
844 | copy_text_and_data (new, a_out) | |
845 | int new, a_out; | |
846 | { | |
847 | register char *end; | |
848 | register char *ptr; | |
849 | ||
850 | #ifdef COFF | |
851 | ||
852 | #ifdef USG_SHARED_LIBRARIES | |
853 | ||
854 | int scns; | |
855 | struct scnhdr scntemp; /* Temporary section header */ | |
856 | ||
857 | /* The purpose of this code is to write out the new file's section | |
858 | * contents. | |
859 | * | |
860 | * Step through the section table. If we know the section (.text, | |
861 | * .data) do the appropriate thing. Otherwise, if the section has | |
862 | * no allocated space in the file (.bss), do nothing. Otherwise, | |
863 | * the section has space allocated in the file, and is not a section | |
864 | * we know. So just copy it. | |
865 | */ | |
866 | ||
867 | lseek (a_out, sizeof (struct filehdr) + sizeof (struct aouthdr), 0); | |
868 | ||
869 | for (scns = f_hdr.f_nscns; scns > 0; scns--) | |
870 | { | |
871 | if (read (a_out, &scntemp, sizeof (scntemp)) != sizeof (scntemp)) | |
872 | PERROR ("temacs"); | |
873 | ||
874 | if (!strcmp (scntemp.s_name, ".text")) | |
875 | { | |
876 | lseek (new, (long) text_scnptr, 0); | |
877 | ptr = (char *) f_ohdr.text_start; | |
878 | end = ptr + f_ohdr.tsize; | |
879 | write_segment (new, ptr, end); | |
880 | } | |
881 | else if (!strcmp (scntemp.s_name, ".data")) | |
882 | { | |
883 | lseek (new, (long) data_scnptr, 0); | |
884 | ptr = (char *) f_ohdr.data_start; | |
885 | end = ptr + f_ohdr.dsize; | |
886 | write_segment (new, ptr, end); | |
887 | } | |
888 | else if (!scntemp.s_scnptr) | |
889 | ; /* do nothing - no data for this section */ | |
890 | else | |
891 | { | |
892 | char page[BUFSIZ]; | |
893 | int size, n; | |
894 | long old_a_out_ptr = lseek (a_out, 0, 1); | |
895 | ||
896 | lseek (a_out, scntemp.s_scnptr, 0); | |
897 | for (size = scntemp.s_size; size > 0; size -= sizeof (page)) | |
898 | { | |
899 | n = size > sizeof (page) ? sizeof (page) : size; | |
900 | if (read (a_out, page, n) != n || write (new, page, n) != n) | |
8116bbb0 | 901 | PERROR ("emacs"); |
7dd63af1 RS |
902 | } |
903 | lseek (a_out, old_a_out_ptr, 0); | |
904 | } | |
905 | } | |
906 | ||
907 | #else /* COFF, but not USG_SHARED_LIBRARIES */ | |
908 | ||
8eb2807f RS |
909 | #ifdef MSDOS |
910 | #if __DJGPP__ >= 2 | |
911 | /* Dump the original table of exception handlers, not the one | |
912 | where our exception hooks are registered. */ | |
913 | __djgpp_exception_toggle (); | |
c17a2102 KH |
914 | |
915 | /* Switch off startup flags that might have been set at runtime | |
916 | and which might change the way that dumped Emacs works. */ | |
917 | save_djgpp_startup_flags = _crt0_startup_flags; | |
918 | _crt0_startup_flags &= ~(_CRT0_FLAG_NO_LFN | _CRT0_FLAG_NEARPTR); | |
8eb2807f RS |
919 | #endif |
920 | #endif | |
921 | ||
7dd63af1 RS |
922 | lseek (new, (long) text_scnptr, 0); |
923 | ptr = (char *) f_ohdr.text_start; | |
924 | #ifdef HEADER_INCL_IN_TEXT | |
925 | /* For Gould UTX/32, text starts after headers */ | |
926 | ptr = (char *) (ptr + text_scnptr); | |
927 | #endif /* HEADER_INCL_IN_TEXT */ | |
928 | end = ptr + f_ohdr.tsize; | |
929 | write_segment (new, ptr, end); | |
930 | ||
931 | lseek (new, (long) data_scnptr, 0); | |
932 | ptr = (char *) f_ohdr.data_start; | |
933 | end = ptr + f_ohdr.dsize; | |
934 | write_segment (new, ptr, end); | |
935 | ||
8eb2807f RS |
936 | #ifdef MSDOS |
937 | #if __DJGPP__ >= 2 | |
938 | /* Restore our exception hooks. */ | |
939 | __djgpp_exception_toggle (); | |
c17a2102 KH |
940 | |
941 | /* Restore the startup flags. */ | |
942 | _crt0_startup_flags = save_djgpp_startup_flags; | |
8eb2807f RS |
943 | #endif |
944 | #endif | |
945 | ||
7dd63af1 RS |
946 | #endif /* USG_SHARED_LIBRARIES */ |
947 | ||
948 | #else /* if not COFF */ | |
949 | ||
950 | /* Some machines count the header as part of the text segment. | |
951 | That is to say, the header appears in core | |
f34e2e18 | 952 | just before the address that start_of_text returns. |
7dd63af1 RS |
953 | For them, N_TXTOFF is the place where the header goes. |
954 | We must adjust the seek to the place after the header. | |
955 | Note that at this point hdr.a_text does *not* count | |
956 | the extra A_TEXT_OFFSET bytes, only the actual bytes of code. */ | |
957 | ||
958 | #ifdef A_TEXT_SEEK | |
959 | lseek (new, (long) A_TEXT_SEEK (hdr), 0); | |
960 | #else | |
961 | lseek (new, (long) N_TXTOFF (hdr), 0); | |
962 | #endif /* no A_TEXT_SEEK */ | |
963 | ||
52a2b13b RS |
964 | #ifdef RISCiX |
965 | ||
966 | /* Acorn's RISC-iX has a wacky way of initialising the position of the heap. | |
967 | * There is a little table in crt0.o that is filled at link time with | |
f34e2e18 | 968 | * the min and current brk positions, among other things. When start |
52a2b13b RS |
969 | * runs, it copies the table to where these parameters live during |
970 | * execution. This data is in text space, so it cannot be modified here | |
971 | * before saving the executable, so the data is written manually. In | |
8e6208c5 KH |
972 | * addition, the table does not have a label, and the nearest accessible |
973 | * label (mcount) is not prefixed with a '_', thus making it inaccessible | |
52a2b13b RS |
974 | * from within C programs. To overcome this, emacs's executable is passed |
975 | * through the command 'nm %s | fgrep mcount' into a pipe, and the | |
976 | * resultant output is then used to find the address of 'mcount'. As far as | |
977 | * is possible to determine, in RISC-iX releases prior to 1.2, the negative | |
978 | * offset of the table from mcount is 0x2c, whereas from 1.2 onwards it is | |
979 | * 0x30. bss_end has been rounded up to page boundary. This solution is | |
980 | * based on suggestions made by Kevin Welton and Steve Hunt of Acorn, and | |
981 | * avoids the need for a custom version of crt0.o for emacs which has its | |
982 | * table in data space. | |
983 | */ | |
984 | ||
985 | { | |
986 | char command[1024]; | |
987 | char errbuf[1024]; | |
988 | char address_text[32]; | |
989 | int proforma[4]; | |
990 | FILE *pfile; | |
991 | char *temp_ptr; | |
992 | char c; | |
993 | int mcount_address, mcount_offset, count; | |
994 | extern char *_execname; | |
995 | ||
996 | ||
997 | /* The use of _execname is incompatible with RISCiX 1.1 */ | |
998 | sprintf (command, "nm %s | fgrep mcount", _execname); | |
999 | ||
1000 | if ( (pfile = popen(command, "r")) == NULL) | |
1001 | { | |
1002 | sprintf (errbuf, "Could not open pipe"); | |
1003 | PERROR (errbuf); | |
1004 | } | |
1005 | ||
1006 | count=0; | |
1007 | while ( ((c=getc(pfile)) != EOF) && (c != ' ') && (count < 31)) | |
1008 | address_text[count++]=c; | |
1009 | address_text[count]=0; | |
1010 | ||
1011 | if ((count == 0) || pclose(pfile) != NULL) | |
1012 | { | |
1013 | sprintf (errbuf, "Failed to execute the command '%s'\n", command); | |
1014 | PERROR (errbuf); | |
1015 | } | |
1016 | ||
1017 | sscanf(address_text, "%x", &mcount_address); | |
1018 | ptr = (char *) unexec_text_start; | |
1019 | mcount_offset = (char *)mcount_address - ptr; | |
1020 | ||
1021 | #ifdef RISCiX_1_1 | |
1022 | #define EDATA_OFFSET 0x2c | |
1023 | #else | |
1024 | #define EDATA_OFFSET 0x30 | |
1025 | #endif | |
1026 | ||
1027 | end = ptr + mcount_offset - EDATA_OFFSET; | |
52a2b13b RS |
1028 | |
1029 | write_segment (new, ptr, end); | |
1030 | ||
1031 | proforma[0] = bss_end; /* becomes _edata */ | |
1032 | proforma[1] = bss_end; /* becomes _end */ | |
1033 | proforma[2] = bss_end; /* becomes _minbrk */ | |
1034 | proforma[3] = bss_end; /* becomes _curbrk */ | |
1035 | ||
52a2b13b RS |
1036 | write (new, proforma, 16); |
1037 | ||
1038 | temp_ptr = ptr; | |
1039 | ptr = end + 16; | |
1040 | end = temp_ptr + hdr.a_text; | |
1041 | ||
52a2b13b RS |
1042 | write_segment (new, ptr, end); |
1043 | } | |
1044 | ||
1045 | #else /* !RISCiX */ | |
7dd63af1 RS |
1046 | ptr = (char *) unexec_text_start; |
1047 | end = ptr + hdr.a_text; | |
1048 | write_segment (new, ptr, end); | |
52a2b13b | 1049 | #endif /* RISCiX */ |
7dd63af1 RS |
1050 | |
1051 | ptr = (char *) unexec_data_start; | |
1052 | end = ptr + hdr.a_data; | |
1053 | /* This lseek is certainly incorrect when A_TEXT_OFFSET | |
1054 | and I believe it is a no-op otherwise. | |
1055 | Let's see if its absence ever fails. */ | |
1056 | /* lseek (new, (long) N_TXTOFF (hdr) + hdr.a_text, 0); */ | |
1057 | write_segment (new, ptr, end); | |
1058 | ||
1059 | #endif /* not COFF */ | |
1060 | ||
1061 | return 0; | |
1062 | } | |
1063 | ||
1064 | write_segment (new, ptr, end) | |
1065 | int new; | |
1066 | register char *ptr, *end; | |
1067 | { | |
1068 | register int i, nwrite, ret; | |
1069 | char buf[80]; | |
a5e73edc | 1070 | #ifndef USE_CRT_DLL |
7dd63af1 | 1071 | extern int errno; |
a5e73edc | 1072 | #endif |
5a31e1d0 RS |
1073 | /* This is the normal amount to write at once. |
1074 | It is the size of block that NFS uses. */ | |
1075 | int writesize = 1 << 13; | |
68db0173 | 1076 | int pagesize = getpagesize (); |
5a31e1d0 | 1077 | char zeros[1 << 13]; |
7dd63af1 | 1078 | |
5a31e1d0 | 1079 | bzero (zeros, sizeof (zeros)); |
7dd63af1 RS |
1080 | |
1081 | for (i = 0; ptr < end;) | |
1082 | { | |
5a31e1d0 RS |
1083 | /* Distance to next multiple of writesize. */ |
1084 | nwrite = (((int) ptr + writesize) & -writesize) - (int) ptr; | |
7dd63af1 RS |
1085 | /* But not beyond specified end. */ |
1086 | if (nwrite > end - ptr) nwrite = end - ptr; | |
1087 | ret = write (new, ptr, nwrite); | |
1088 | /* If write gets a page fault, it means we reached | |
1089 | a gap between the old text segment and the old data segment. | |
1090 | This gap has probably been remapped into part of the text segment. | |
1091 | So write zeros for it. */ | |
3680bdc6 RS |
1092 | if (ret == -1 |
1093 | #ifdef EFAULT | |
1094 | && errno == EFAULT | |
1095 | #endif | |
1096 | ) | |
5a31e1d0 RS |
1097 | { |
1098 | /* Write only a page of zeros at once, | |
1099 | so that we we don't overshoot the start | |
1100 | of the valid memory in the old data segment. */ | |
1101 | if (nwrite > pagesize) | |
1102 | nwrite = pagesize; | |
1103 | write (new, zeros, nwrite); | |
1104 | } | |
1105 | #if 0 /* Now that we have can ask `write' to write more than a page, | |
1106 | it is legit for write do less than the whole amount specified. */ | |
7dd63af1 RS |
1107 | else if (nwrite != ret) |
1108 | { | |
1109 | sprintf (buf, | |
1110 | "unexec write failure: addr 0x%x, fileno %d, size 0x%x, wrote 0x%x, errno %d", | |
1111 | ptr, new, nwrite, ret, errno); | |
1112 | PERROR (buf); | |
1113 | } | |
5a31e1d0 | 1114 | #endif |
7dd63af1 RS |
1115 | i += nwrite; |
1116 | ptr += nwrite; | |
1117 | } | |
1118 | } | |
1119 | \f | |
1120 | /* **************************************************************** | |
1121 | * copy_sym | |
1122 | * | |
1123 | * Copy the relocation information and symbol table from the a.out to the new | |
1124 | */ | |
1125 | static int | |
1126 | copy_sym (new, a_out, a_name, new_name) | |
1127 | int new, a_out; | |
1128 | char *a_name, *new_name; | |
1129 | { | |
1130 | char page[1024]; | |
1131 | int n; | |
1132 | ||
1133 | if (a_out < 0) | |
1134 | return 0; | |
1135 | ||
1136 | #ifdef COFF | |
1137 | if (SYMS_START == 0L) | |
1138 | return 0; | |
1139 | #endif /* COFF */ | |
1140 | ||
1141 | #ifdef COFF | |
1142 | if (lnnoptr) /* if there is line number info */ | |
c8b14b5f | 1143 | lseek (a_out, coff_offset + lnnoptr, 0); /* start copying from there */ |
7dd63af1 | 1144 | else |
c8b14b5f RS |
1145 | lseek (a_out, coff_offset + SYMS_START, 0); /* Position a.out to symtab. */ |
1146 | #else /* not COFF */ | |
1147 | lseek (a_out, SYMS_START, 0); /* Position a.out to symtab. */ | |
1148 | #endif /* not COFF */ | |
7dd63af1 RS |
1149 | |
1150 | while ((n = read (a_out, page, sizeof page)) > 0) | |
1151 | { | |
1152 | if (write (new, page, n) != n) | |
1153 | { | |
1154 | PERROR (new_name); | |
1155 | } | |
1156 | } | |
1157 | if (n < 0) | |
1158 | { | |
1159 | PERROR (a_name); | |
1160 | } | |
1161 | return 0; | |
1162 | } | |
1163 | \f | |
1164 | /* **************************************************************** | |
1165 | * mark_x | |
1166 | * | |
eb8c3be9 | 1167 | * After successfully building the new a.out, mark it executable |
7dd63af1 RS |
1168 | */ |
1169 | static void | |
1170 | mark_x (name) | |
1171 | char *name; | |
1172 | { | |
1173 | struct stat sbuf; | |
1174 | int um; | |
1175 | int new = 0; /* for PERROR */ | |
1176 | ||
1177 | um = umask (777); | |
1178 | umask (um); | |
1179 | if (stat (name, &sbuf) == -1) | |
1180 | { | |
1181 | PERROR (name); | |
1182 | } | |
1183 | sbuf.st_mode |= 0111 & ~um; | |
1184 | if (chmod (name, sbuf.st_mode) == -1) | |
1185 | PERROR (name); | |
1186 | } | |
1187 | \f | |
1188 | #ifdef COFF | |
1189 | #ifndef COFF_BSD_SYMBOLS | |
1190 | ||
1191 | /* | |
1192 | * If the COFF file contains a symbol table and a line number section, | |
1193 | * then any auxiliary entries that have values for x_lnnoptr must | |
1194 | * be adjusted by the amount that the line number section has moved | |
1195 | * in the file (bias computed in make_hdr). The #@$%&* designers of | |
1196 | * the auxiliary entry structures used the absolute file offsets for | |
1197 | * the line number entry rather than an offset from the start of the | |
1198 | * line number section! | |
1199 | * | |
1200 | * When I figure out how to scan through the symbol table and pick out | |
1201 | * the auxiliary entries that need adjustment, this routine will | |
1202 | * be fixed. As it is now, all such entries are wrong and sdb | |
1203 | * will complain. Fred Fish, UniSoft Systems Inc. | |
1204 | */ | |
1205 | ||
1206 | /* This function is probably very slow. Instead of reopening the new | |
1207 | file for input and output it should copy from the old to the new | |
1208 | using the two descriptors already open (WRITEDESC and READDESC). | |
1209 | Instead of reading one small structure at a time it should use | |
1210 | a reasonable size buffer. But I don't have time to work on such | |
1211 | things, so I am installing it as submitted to me. -- RMS. */ | |
1212 | ||
1213 | adjust_lnnoptrs (writedesc, readdesc, new_name) | |
1214 | int writedesc; | |
1215 | int readdesc; | |
1216 | char *new_name; | |
1217 | { | |
1218 | register int nsyms; | |
1219 | register int new; | |
91bac16a | 1220 | #if defined (amdahl_uts) || defined (pfa) |
7dd63af1 RS |
1221 | SYMENT symentry; |
1222 | AUXENT auxentry; | |
1223 | #else | |
1224 | struct syment symentry; | |
1225 | union auxent auxentry; | |
1226 | #endif | |
1227 | ||
1228 | if (!lnnoptr || !f_hdr.f_symptr) | |
1229 | return 0; | |
1230 | ||
3680bdc6 RS |
1231 | #ifdef MSDOS |
1232 | if ((new = writedesc) < 0) | |
1233 | #else | |
2d30a233 | 1234 | if ((new = open (new_name, O_RDWR)) < 0) |
3680bdc6 | 1235 | #endif |
7dd63af1 RS |
1236 | { |
1237 | PERROR (new_name); | |
1238 | return -1; | |
1239 | } | |
1240 | ||
1241 | lseek (new, f_hdr.f_symptr, 0); | |
1242 | for (nsyms = 0; nsyms < f_hdr.f_nsyms; nsyms++) | |
1243 | { | |
1244 | read (new, &symentry, SYMESZ); | |
1245 | if (symentry.n_numaux) | |
1246 | { | |
1247 | read (new, &auxentry, AUXESZ); | |
1248 | nsyms++; | |
1ba3de00 RS |
1249 | if (ISFCN (symentry.n_type) || symentry.n_type == 0x2400) |
1250 | { | |
1251 | auxentry.x_sym.x_fcnary.x_fcn.x_lnnoptr += bias; | |
1252 | lseek (new, -AUXESZ, 1); | |
1253 | write (new, &auxentry, AUXESZ); | |
1254 | } | |
7dd63af1 RS |
1255 | } |
1256 | } | |
3680bdc6 | 1257 | #ifndef MSDOS |
7dd63af1 | 1258 | close (new); |
3680bdc6 RS |
1259 | #endif |
1260 | return 0; | |
7dd63af1 RS |
1261 | } |
1262 | ||
1263 | #endif /* COFF_BSD_SYMBOLS */ | |
1264 | ||
1265 | #endif /* COFF */ | |
1266 | ||
7dd63af1 | 1267 | #endif /* not CANNOT_DUMP */ |