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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 | ||
2a4487ac GM |
174 | #ifdef COFF |
175 | #include <coff.h> | |
176 | #else | |
265a9e55 JB |
177 | #ifdef COFF_ENCAPSULATE |
178 | int need_coff_header = 1; | |
179 | #include <coff-encap/a.out.encap.h> /* The location might be a poor assumption */ | |
180 | #else | |
3680bdc6 | 181 | #ifdef MSDOS |
8eb2807f RS |
182 | #if __DJGPP__ > 1 |
183 | #include <fcntl.h> /* for O_RDONLY, O_RDWR */ | |
c17a2102 KH |
184 | #include <crt0.h> /* for _crt0_startup_flags and its bits */ |
185 | static int save_djgpp_startup_flags; | |
8eb2807f | 186 | #endif |
234d3183 | 187 | #include <coff.h> |
3680bdc6 RS |
188 | #define filehdr external_filehdr |
189 | #define scnhdr external_scnhdr | |
190 | #define syment external_syment | |
191 | #define auxent external_auxent | |
192 | #define n_numaux e_numaux | |
193 | #define n_type e_type | |
194 | struct aouthdr | |
195 | { | |
234d3183 RS |
196 | unsigned short magic; /* type of file */ |
197 | unsigned short vstamp; /* version stamp */ | |
198 | unsigned long tsize; /* text size in bytes, padded to FW bdry*/ | |
199 | unsigned long dsize; /* initialized data " " */ | |
200 | unsigned long bsize; /* uninitialized data " " */ | |
201 | unsigned long entry; /* entry pt. */ | |
202 | unsigned long text_start;/* base of text used for this file */ | |
203 | unsigned long data_start;/* base of data used for this file */ | |
3680bdc6 RS |
204 | }; |
205 | ||
206 | ||
207 | #else /* not MSDOS */ | |
7dd63af1 | 208 | #include <a.out.h> |
3680bdc6 | 209 | #endif /* not MSDOS */ |
265a9e55 | 210 | #endif |
2a4487ac | 211 | #endif /* not COFF */ |
265a9e55 | 212 | |
f34e2e18 RS |
213 | /* Define getpagesize if the system does not. |
214 | Note that this may depend on symbols defined in a.out.h. */ | |
7dd63af1 RS |
215 | #include "getpagesize.h" |
216 | ||
217 | #ifndef makedev /* Try to detect types.h already loaded */ | |
218 | #include <sys/types.h> | |
265a9e55 | 219 | #endif /* makedev */ |
7dd63af1 RS |
220 | #include <stdio.h> |
221 | #include <sys/stat.h> | |
222 | #include <errno.h> | |
223 | ||
2d30a233 RM |
224 | #include <sys/file.h> /* Must be after sys/types.h for USG and BSD4_1*/ |
225 | ||
226 | #ifdef USG5 | |
227 | #include <fcntl.h> | |
228 | #endif | |
229 | ||
230 | #ifndef O_RDONLY | |
231 | #define O_RDONLY 0 | |
232 | #endif | |
233 | #ifndef O_RDWR | |
234 | #define O_RDWR 2 | |
235 | #endif | |
236 | ||
237 | ||
7dd63af1 RS |
238 | extern char *start_of_text (); /* Start of text */ |
239 | extern char *start_of_data (); /* Start of initialized data */ | |
240 | ||
241 | #ifdef COFF | |
242 | static long block_copy_start; /* Old executable start point */ | |
243 | static struct filehdr f_hdr; /* File header */ | |
244 | static struct aouthdr f_ohdr; /* Optional file header (a.out) */ | |
245 | long bias; /* Bias to add for growth */ | |
246 | long lnnoptr; /* Pointer to line-number info within file */ | |
247 | #define SYMS_START block_copy_start | |
248 | ||
249 | static long text_scnptr; | |
250 | static long data_scnptr; | |
251 | ||
c8b14b5f RS |
252 | static long coff_offset; |
253 | ||
7dd63af1 RS |
254 | #else /* not COFF */ |
255 | ||
83cb209c JB |
256 | #ifdef HPUX |
257 | extern void *sbrk (); | |
258 | #else | |
f31fe472 RM |
259 | #if 0 |
260 | /* Some systems with __STDC__ compilers still declare this `char *' in some | |
261 | header file, and our declaration conflicts. The return value is always | |
262 | cast, so it should be harmless to leave it undefined. Hopefully | |
263 | machines with different size pointers and ints declare sbrk in a header | |
264 | file. */ | |
d4327fec JB |
265 | #ifdef __STDC__ |
266 | extern void *sbrk (); | |
267 | #else | |
7dd63af1 | 268 | extern char *sbrk (); |
83cb209c | 269 | #endif /* __STDC__ */ |
f31fe472 | 270 | #endif |
83cb209c | 271 | #endif /* HPUX */ |
7dd63af1 RS |
272 | |
273 | #define SYMS_START ((long) N_SYMOFF (ohdr)) | |
274 | ||
275 | /* Some machines override the structure name for an a.out header. */ | |
276 | #ifndef EXEC_HDR_TYPE | |
277 | #define EXEC_HDR_TYPE struct exec | |
278 | #endif | |
279 | ||
280 | #ifdef HPUX | |
281 | #ifdef HP9000S200_ID | |
282 | #define MY_ID HP9000S200_ID | |
283 | #else | |
284 | #include <model.h> | |
285 | #define MY_ID MYSYS | |
286 | #endif /* no HP9000S200_ID */ | |
287 | static MAGIC OLDMAGIC = {MY_ID, SHARE_MAGIC}; | |
288 | static MAGIC NEWMAGIC = {MY_ID, DEMAND_MAGIC}; | |
289 | #define N_TXTOFF(x) TEXT_OFFSET(x) | |
290 | #define N_SYMOFF(x) LESYM_OFFSET(x) | |
291 | static EXEC_HDR_TYPE hdr, ohdr; | |
292 | ||
293 | #else /* not HPUX */ | |
294 | ||
161aa2f8 | 295 | #if defined (USG) && !defined (IBMAIX) && !defined (IRIS) && !defined (COFF_ENCAPSULATE) && !defined (LINUX) |
7dd63af1 RS |
296 | static struct bhdr hdr, ohdr; |
297 | #define a_magic fmagic | |
298 | #define a_text tsize | |
299 | #define a_data dsize | |
300 | #define a_bss bsize | |
301 | #define a_syms ssize | |
302 | #define a_trsize rtsize | |
303 | #define a_drsize rdsize | |
304 | #define a_entry entry | |
305 | #define N_BADMAG(x) \ | |
306 | (((x).fmagic)!=OMAGIC && ((x).fmagic)!=NMAGIC &&\ | |
307 | ((x).fmagic)!=FMAGIC && ((x).fmagic)!=IMAGIC) | |
308 | #define NEWMAGIC FMAGIC | |
309 | #else /* IRIS or IBMAIX or not USG */ | |
310 | static EXEC_HDR_TYPE hdr, ohdr; | |
311 | #define NEWMAGIC ZMAGIC | |
312 | #endif /* IRIS or IBMAIX not USG */ | |
313 | #endif /* not HPUX */ | |
314 | ||
315 | static int unexec_text_start; | |
316 | static int unexec_data_start; | |
317 | ||
265a9e55 JB |
318 | #ifdef COFF_ENCAPSULATE |
319 | /* coffheader is defined in the GNU a.out.encap.h file. */ | |
320 | struct coffheader coffheader; | |
321 | #endif | |
322 | ||
7dd63af1 RS |
323 | #endif /* not COFF */ |
324 | ||
325 | static int pagemask; | |
326 | ||
327 | /* Correct an int which is the bit pattern of a pointer to a byte | |
328 | into an int which is the number of a byte. | |
329 | This is a no-op on ordinary machines, but not on all. */ | |
330 | ||
331 | #ifndef ADDR_CORRECT /* Let m-*.h files override this definition */ | |
332 | #define ADDR_CORRECT(x) ((char *)(x) - (char*)0) | |
333 | #endif | |
334 | ||
335 | #ifdef emacs | |
336 | ||
2d30a233 RM |
337 | #include "lisp.h" |
338 | ||
7dd63af1 RS |
339 | static |
340 | report_error (file, fd) | |
341 | char *file; | |
342 | int fd; | |
343 | { | |
344 | if (fd) | |
345 | close (fd); | |
2d30a233 | 346 | report_file_error ("Cannot unexec", Fcons (build_string (file), Qnil)); |
7dd63af1 RS |
347 | } |
348 | #endif /* emacs */ | |
349 | ||
350 | #define ERROR0(msg) report_error_1 (new, msg, 0, 0); return -1 | |
351 | #define ERROR1(msg,x) report_error_1 (new, msg, x, 0); return -1 | |
352 | #define ERROR2(msg,x,y) report_error_1 (new, msg, x, y); return -1 | |
353 | ||
354 | static | |
355 | report_error_1 (fd, msg, a1, a2) | |
356 | int fd; | |
357 | char *msg; | |
358 | int a1, a2; | |
359 | { | |
360 | close (fd); | |
361 | #ifdef emacs | |
362 | error (msg, a1, a2); | |
363 | #else | |
364 | fprintf (stderr, msg, a1, a2); | |
365 | fprintf (stderr, "\n"); | |
366 | #endif | |
367 | } | |
368 | \f | |
369 | static int make_hdr (); | |
370 | static int copy_text_and_data (); | |
371 | static int copy_sym (); | |
372 | static void mark_x (); | |
373 | ||
374 | /* **************************************************************** | |
375 | * unexec | |
376 | * | |
377 | * driving logic. | |
378 | */ | |
379 | unexec (new_name, a_name, data_start, bss_start, entry_address) | |
380 | char *new_name, *a_name; | |
381 | unsigned data_start, bss_start, entry_address; | |
382 | { | |
383 | int new, a_out = -1; | |
384 | ||
2d30a233 | 385 | if (a_name && (a_out = open (a_name, O_RDONLY)) < 0) |
7dd63af1 RS |
386 | { |
387 | PERROR (a_name); | |
388 | } | |
389 | if ((new = creat (new_name, 0666)) < 0) | |
390 | { | |
391 | PERROR (new_name); | |
392 | } | |
393 | ||
394 | if (make_hdr (new, a_out, data_start, bss_start, entry_address, a_name, new_name) < 0 | |
395 | || copy_text_and_data (new, a_out) < 0 | |
396 | || copy_sym (new, a_out, a_name, new_name) < 0 | |
397 | #ifdef COFF | |
398 | #ifndef COFF_BSD_SYMBOLS | |
399 | || adjust_lnnoptrs (new, a_out, new_name) < 0 | |
400 | #endif | |
401 | #endif | |
402 | ) | |
403 | { | |
404 | close (new); | |
405 | /* unlink (new_name); /* Failed, unlink new a.out */ | |
406 | return -1; | |
407 | } | |
408 | ||
409 | close (new); | |
410 | if (a_out >= 0) | |
411 | close (a_out); | |
412 | mark_x (new_name); | |
413 | return 0; | |
414 | } | |
415 | ||
416 | /* **************************************************************** | |
417 | * make_hdr | |
418 | * | |
419 | * Make the header in the new a.out from the header in core. | |
420 | * Modify the text and data sizes. | |
421 | */ | |
422 | static int | |
423 | make_hdr (new, a_out, data_start, bss_start, entry_address, a_name, new_name) | |
424 | int new, a_out; | |
425 | unsigned data_start, bss_start, entry_address; | |
426 | char *a_name; | |
427 | char *new_name; | |
428 | { | |
429 | int tem; | |
430 | #ifdef COFF | |
431 | auto struct scnhdr f_thdr; /* Text section header */ | |
432 | auto struct scnhdr f_dhdr; /* Data section header */ | |
433 | auto struct scnhdr f_bhdr; /* Bss section header */ | |
434 | auto struct scnhdr scntemp; /* Temporary section header */ | |
435 | register int scns; | |
436 | #endif /* COFF */ | |
437 | #ifdef USG_SHARED_LIBRARIES | |
438 | extern unsigned int bss_end; | |
439 | #else | |
440 | unsigned int bss_end; | |
441 | #endif | |
442 | ||
443 | pagemask = getpagesize () - 1; | |
444 | ||
445 | /* Adjust text/data boundary. */ | |
446 | #ifdef NO_REMAP | |
447 | data_start = (int) start_of_data (); | |
448 | #else /* not NO_REMAP */ | |
449 | if (!data_start) | |
450 | data_start = (int) start_of_data (); | |
451 | #endif /* not NO_REMAP */ | |
452 | data_start = ADDR_CORRECT (data_start); | |
453 | ||
454 | #ifdef SEGMENT_MASK | |
455 | data_start = data_start & ~SEGMENT_MASK; /* (Down) to segment boundary. */ | |
456 | #else | |
457 | data_start = data_start & ~pagemask; /* (Down) to page boundary. */ | |
458 | #endif | |
459 | ||
460 | bss_end = ADDR_CORRECT (sbrk (0)) + pagemask; | |
461 | bss_end &= ~ pagemask; | |
462 | ||
463 | /* Adjust data/bss boundary. */ | |
464 | if (bss_start != 0) | |
465 | { | |
466 | bss_start = (ADDR_CORRECT (bss_start) + pagemask); | |
467 | /* (Up) to page bdry. */ | |
468 | bss_start &= ~ pagemask; | |
469 | if (bss_start > bss_end) | |
470 | { | |
471 | ERROR1 ("unexec: Specified bss_start (%u) is past end of program", | |
472 | bss_start); | |
473 | } | |
474 | } | |
475 | else | |
476 | bss_start = bss_end; | |
477 | ||
478 | if (data_start > bss_start) /* Can't have negative data size. */ | |
479 | { | |
480 | ERROR2 ("unexec: data_start (%u) can't be greater than bss_start (%u)", | |
481 | data_start, bss_start); | |
482 | } | |
483 | ||
484 | #ifdef COFF | |
c8b14b5f RS |
485 | coff_offset = 0L; /* stays zero, except in DJGPP */ |
486 | ||
7dd63af1 RS |
487 | /* Salvage as much info from the existing file as possible */ |
488 | if (a_out >= 0) | |
489 | { | |
c8b14b5f RS |
490 | #ifdef MSDOS |
491 | #if __DJGPP__ > 1 | |
492 | /* Support the coff-go32-exe format with a prepended stub, since | |
493 | this is what GCC 2.8.0 and later generates by default in DJGPP. */ | |
494 | unsigned short mz_header[3]; | |
495 | ||
496 | if (read (a_out, &mz_header, sizeof (mz_header)) != sizeof (mz_header)) | |
497 | { | |
498 | PERROR (a_name); | |
499 | } | |
500 | if (mz_header[0] == 0x5a4d || mz_header[0] == 0x4d5a) /* "MZ" or "ZM" */ | |
501 | { | |
502 | coff_offset = (long)mz_header[2] * 512L; | |
503 | if (mz_header[1]) | |
504 | coff_offset += (long)mz_header[1] - 512L; | |
505 | lseek (a_out, coff_offset, 0); | |
506 | } | |
507 | else | |
508 | lseek (a_out, 0L, 0); | |
509 | #endif /* __DJGPP__ > 1 */ | |
510 | #endif /* MSDOS */ | |
7dd63af1 RS |
511 | if (read (a_out, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) |
512 | { | |
513 | PERROR (a_name); | |
514 | } | |
515 | block_copy_start += sizeof (f_hdr); | |
516 | if (f_hdr.f_opthdr > 0) | |
517 | { | |
518 | if (read (a_out, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) | |
519 | { | |
520 | PERROR (a_name); | |
521 | } | |
522 | block_copy_start += sizeof (f_ohdr); | |
523 | } | |
524 | /* Loop through section headers, copying them in */ | |
c8b14b5f | 525 | lseek (a_out, coff_offset + sizeof (f_hdr) + f_hdr.f_opthdr, 0); |
7dd63af1 RS |
526 | for (scns = f_hdr.f_nscns; scns > 0; scns--) { |
527 | if (read (a_out, &scntemp, sizeof (scntemp)) != sizeof (scntemp)) | |
528 | { | |
529 | PERROR (a_name); | |
530 | } | |
531 | if (scntemp.s_scnptr > 0L) | |
532 | { | |
533 | if (block_copy_start < scntemp.s_scnptr + scntemp.s_size) | |
534 | block_copy_start = scntemp.s_scnptr + scntemp.s_size; | |
535 | } | |
536 | if (strcmp (scntemp.s_name, ".text") == 0) | |
537 | { | |
538 | f_thdr = scntemp; | |
539 | } | |
540 | else if (strcmp (scntemp.s_name, ".data") == 0) | |
541 | { | |
542 | f_dhdr = scntemp; | |
543 | } | |
544 | else if (strcmp (scntemp.s_name, ".bss") == 0) | |
545 | { | |
546 | f_bhdr = scntemp; | |
547 | } | |
548 | } | |
549 | } | |
550 | else | |
551 | { | |
552 | ERROR0 ("can't build a COFF file from scratch yet"); | |
553 | } | |
554 | ||
555 | /* Now we alter the contents of all the f_*hdr variables | |
556 | to correspond to what we want to dump. */ | |
557 | ||
558 | #ifdef USG_SHARED_LIBRARIES | |
559 | ||
560 | /* The amount of data we're adding to the file is distance from the | |
561 | * end of the original .data space to the current end of the .data | |
562 | * space. | |
563 | */ | |
564 | ||
1ba3de00 | 565 | bias = bss_start - (f_ohdr.data_start + f_dhdr.s_size); |
7dd63af1 RS |
566 | |
567 | #endif | |
568 | ||
569 | f_hdr.f_flags |= (F_RELFLG | F_EXEC); | |
570 | #ifdef TPIX | |
571 | f_hdr.f_nscns = 3; | |
572 | #endif | |
573 | #ifdef EXEC_MAGIC | |
574 | f_ohdr.magic = EXEC_MAGIC; | |
575 | #endif | |
576 | #ifndef NO_REMAP | |
577 | f_ohdr.text_start = (long) start_of_text (); | |
578 | f_ohdr.tsize = data_start - f_ohdr.text_start; | |
579 | f_ohdr.data_start = data_start; | |
580 | #endif /* NO_REMAP */ | |
581 | f_ohdr.dsize = bss_start - f_ohdr.data_start; | |
582 | f_ohdr.bsize = bss_end - bss_start; | |
583 | #ifndef KEEP_OLD_TEXT_SCNPTR | |
584 | /* On some machines, the old values are right. | |
585 | ??? Maybe on all machines with NO_REMAP. */ | |
586 | f_thdr.s_size = f_ohdr.tsize; | |
587 | f_thdr.s_scnptr = sizeof (f_hdr) + sizeof (f_ohdr); | |
588 | f_thdr.s_scnptr += (f_hdr.f_nscns) * (sizeof (f_thdr)); | |
589 | #endif /* KEEP_OLD_TEXT_SCNPTR */ | |
590 | #ifdef ADJUST_TEXT_SCNHDR_SIZE | |
591 | /* On some machines, `text size' includes all headers. */ | |
592 | f_thdr.s_size -= f_thdr.s_scnptr; | |
593 | #endif /* ADJUST_TEST_SCNHDR_SIZE */ | |
594 | lnnoptr = f_thdr.s_lnnoptr; | |
595 | #ifdef SECTION_ALIGNMENT | |
596 | /* Some systems require special alignment | |
597 | of the sections in the file itself. */ | |
598 | f_thdr.s_scnptr | |
599 | = (f_thdr.s_scnptr + SECTION_ALIGNMENT) & ~SECTION_ALIGNMENT; | |
600 | #endif /* SECTION_ALIGNMENT */ | |
601 | #ifdef TPIX | |
602 | f_thdr.s_scnptr = 0xd0; | |
603 | #endif | |
604 | text_scnptr = f_thdr.s_scnptr; | |
605 | #ifdef ADJUST_TEXTBASE | |
606 | text_scnptr = sizeof (f_hdr) + sizeof (f_ohdr) + (f_hdr.f_nscns) * (sizeof (f_thdr)); | |
607 | #endif | |
608 | #ifndef KEEP_OLD_PADDR | |
609 | f_dhdr.s_paddr = f_ohdr.data_start; | |
610 | #endif /* KEEP_OLD_PADDR */ | |
611 | f_dhdr.s_vaddr = f_ohdr.data_start; | |
612 | f_dhdr.s_size = f_ohdr.dsize; | |
613 | f_dhdr.s_scnptr = f_thdr.s_scnptr + f_thdr.s_size; | |
614 | #ifdef SECTION_ALIGNMENT | |
615 | /* Some systems require special alignment | |
616 | of the sections in the file itself. */ | |
617 | f_dhdr.s_scnptr | |
618 | = (f_dhdr.s_scnptr + SECTION_ALIGNMENT) & ~SECTION_ALIGNMENT; | |
619 | #endif /* SECTION_ALIGNMENT */ | |
620 | #ifdef DATA_SECTION_ALIGNMENT | |
621 | /* Some systems require special alignment | |
622 | of the data section only. */ | |
623 | f_dhdr.s_scnptr | |
624 | = (f_dhdr.s_scnptr + DATA_SECTION_ALIGNMENT) & ~DATA_SECTION_ALIGNMENT; | |
625 | #endif /* DATA_SECTION_ALIGNMENT */ | |
626 | data_scnptr = f_dhdr.s_scnptr; | |
627 | #ifndef KEEP_OLD_PADDR | |
628 | f_bhdr.s_paddr = f_ohdr.data_start + f_ohdr.dsize; | |
629 | #endif /* KEEP_OLD_PADDR */ | |
630 | f_bhdr.s_vaddr = f_ohdr.data_start + f_ohdr.dsize; | |
631 | f_bhdr.s_size = f_ohdr.bsize; | |
632 | f_bhdr.s_scnptr = 0L; | |
633 | #ifndef USG_SHARED_LIBRARIES | |
634 | bias = f_dhdr.s_scnptr + f_dhdr.s_size - block_copy_start; | |
635 | #endif | |
636 | ||
637 | if (f_hdr.f_symptr > 0L) | |
638 | { | |
639 | f_hdr.f_symptr += bias; | |
640 | } | |
641 | ||
642 | if (f_thdr.s_lnnoptr > 0L) | |
643 | { | |
644 | f_thdr.s_lnnoptr += bias; | |
645 | } | |
646 | ||
647 | #ifdef ADJUST_EXEC_HEADER | |
648 | ADJUST_EXEC_HEADER; | |
649 | #endif /* ADJUST_EXEC_HEADER */ | |
650 | ||
651 | if (write (new, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) | |
652 | { | |
653 | PERROR (new_name); | |
654 | } | |
655 | ||
656 | if (write (new, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) | |
657 | { | |
658 | PERROR (new_name); | |
659 | } | |
660 | ||
661 | #ifndef USG_SHARED_LIBRARIES | |
662 | ||
663 | if (write (new, &f_thdr, sizeof (f_thdr)) != sizeof (f_thdr)) | |
664 | { | |
665 | PERROR (new_name); | |
666 | } | |
667 | ||
668 | if (write (new, &f_dhdr, sizeof (f_dhdr)) != sizeof (f_dhdr)) | |
669 | { | |
670 | PERROR (new_name); | |
671 | } | |
672 | ||
673 | if (write (new, &f_bhdr, sizeof (f_bhdr)) != sizeof (f_bhdr)) | |
674 | { | |
675 | PERROR (new_name); | |
676 | } | |
677 | ||
678 | #else /* USG_SHARED_LIBRARIES */ | |
679 | ||
680 | /* The purpose of this code is to write out the new file's section | |
681 | * header table. | |
682 | * | |
683 | * Scan through the original file's sections. If the encountered | |
684 | * section is one we know (.text, .data or .bss), write out the | |
685 | * correct header. If it is a section we do not know (such as | |
686 | * .lib), adjust the address of where the section data is in the | |
687 | * file, and write out the header. | |
688 | * | |
eb8c3be9 | 689 | * If any section precedes .text or .data in the file, this code |
7dd63af1 RS |
690 | * will not adjust the file pointer for that section correctly. |
691 | */ | |
692 | ||
dcceb381 RS |
693 | /* This used to use sizeof (f_ohdr) instead of .f_opthdr. |
694 | .f_opthdr is said to be right when there is no optional header. */ | |
695 | lseek (a_out, sizeof (f_hdr) + f_hdr.f_opthdr, 0); | |
7dd63af1 RS |
696 | |
697 | for (scns = f_hdr.f_nscns; scns > 0; scns--) | |
698 | { | |
699 | if (read (a_out, &scntemp, sizeof (scntemp)) != sizeof (scntemp)) | |
700 | PERROR (a_name); | |
701 | ||
702 | if (!strcmp (scntemp.s_name, f_thdr.s_name)) /* .text */ | |
703 | { | |
704 | if (write (new, &f_thdr, sizeof (f_thdr)) != sizeof (f_thdr)) | |
705 | PERROR (new_name); | |
706 | } | |
707 | else if (!strcmp (scntemp.s_name, f_dhdr.s_name)) /* .data */ | |
708 | { | |
709 | if (write (new, &f_dhdr, sizeof (f_dhdr)) != sizeof (f_dhdr)) | |
710 | PERROR (new_name); | |
711 | } | |
712 | else if (!strcmp (scntemp.s_name, f_bhdr.s_name)) /* .bss */ | |
713 | { | |
714 | if (write (new, &f_bhdr, sizeof (f_bhdr)) != sizeof (f_bhdr)) | |
715 | PERROR (new_name); | |
716 | } | |
717 | else | |
718 | { | |
719 | if (scntemp.s_scnptr) | |
720 | scntemp.s_scnptr += bias; | |
721 | if (write (new, &scntemp, sizeof (scntemp)) != sizeof (scntemp)) | |
722 | PERROR (new_name); | |
723 | } | |
724 | } | |
725 | #endif /* USG_SHARED_LIBRARIES */ | |
726 | ||
727 | return (0); | |
728 | ||
729 | #else /* if not COFF */ | |
730 | ||
731 | /* Get symbol table info from header of a.out file if given one. */ | |
732 | if (a_out >= 0) | |
733 | { | |
265a9e55 JB |
734 | #ifdef COFF_ENCAPSULATE |
735 | if (read (a_out, &coffheader, sizeof coffheader) != sizeof coffheader) | |
736 | { | |
737 | PERROR(a_name); | |
738 | } | |
739 | if (coffheader.f_magic != COFF_MAGIC) | |
740 | { | |
741 | ERROR1("%s doesn't have legal coff magic number\n", a_name); | |
742 | } | |
743 | #endif | |
7dd63af1 RS |
744 | if (read (a_out, &ohdr, sizeof hdr) != sizeof hdr) |
745 | { | |
746 | PERROR (a_name); | |
747 | } | |
748 | ||
749 | if (N_BADMAG (ohdr)) | |
750 | { | |
751 | ERROR1 ("invalid magic number in %s", a_name); | |
752 | } | |
753 | hdr = ohdr; | |
754 | } | |
755 | else | |
756 | { | |
265a9e55 JB |
757 | #ifdef COFF_ENCAPSULATE |
758 | /* We probably could without too much trouble. The code is in gld | |
759 | * but I don't have that much time or incentive. | |
760 | */ | |
761 | ERROR0 ("can't build a COFF file from scratch yet"); | |
3680bdc6 RS |
762 | #else |
763 | #ifdef MSDOS /* Demacs 1.1.1 91/10/16 HIRANO Satoshi */ | |
764 | bzero ((void *)&hdr, sizeof hdr); | |
265a9e55 | 765 | #else |
a5fd213f | 766 | bzero (&hdr, sizeof hdr); |
3680bdc6 | 767 | #endif |
265a9e55 | 768 | #endif |
7dd63af1 RS |
769 | } |
770 | ||
771 | unexec_text_start = (long) start_of_text (); | |
772 | unexec_data_start = data_start; | |
773 | ||
774 | /* Machine-dependent fixup for header, or maybe for unexec_text_start */ | |
775 | #ifdef ADJUST_EXEC_HEADER | |
776 | ADJUST_EXEC_HEADER; | |
777 | #endif /* ADJUST_EXEC_HEADER */ | |
778 | ||
779 | hdr.a_trsize = 0; | |
780 | hdr.a_drsize = 0; | |
781 | if (entry_address != 0) | |
782 | hdr.a_entry = entry_address; | |
783 | ||
784 | hdr.a_bss = bss_end - bss_start; | |
785 | hdr.a_data = bss_start - data_start; | |
786 | #ifdef NO_REMAP | |
787 | hdr.a_text = ohdr.a_text; | |
788 | #else /* not NO_REMAP */ | |
789 | hdr.a_text = data_start - unexec_text_start; | |
790 | ||
791 | #ifdef A_TEXT_OFFSET | |
792 | hdr.a_text += A_TEXT_OFFSET (ohdr); | |
793 | #endif | |
794 | ||
795 | #endif /* not NO_REMAP */ | |
796 | ||
265a9e55 JB |
797 | #ifdef COFF_ENCAPSULATE |
798 | /* We are encapsulating BSD format within COFF format. */ | |
799 | { | |
800 | struct coffscn *tp, *dp, *bp; | |
801 | tp = &coffheader.scns[0]; | |
802 | dp = &coffheader.scns[1]; | |
803 | bp = &coffheader.scns[2]; | |
804 | tp->s_size = hdr.a_text + sizeof(struct exec); | |
805 | dp->s_paddr = data_start; | |
806 | dp->s_vaddr = data_start; | |
807 | dp->s_size = hdr.a_data; | |
808 | bp->s_paddr = dp->s_vaddr + dp->s_size; | |
809 | bp->s_vaddr = bp->s_paddr; | |
810 | bp->s_size = hdr.a_bss; | |
811 | coffheader.tsize = tp->s_size; | |
812 | coffheader.dsize = dp->s_size; | |
813 | coffheader.bsize = bp->s_size; | |
814 | coffheader.text_start = tp->s_vaddr; | |
815 | coffheader.data_start = dp->s_vaddr; | |
816 | } | |
817 | if (write (new, &coffheader, sizeof coffheader) != sizeof coffheader) | |
818 | { | |
819 | PERROR(new_name); | |
820 | } | |
821 | #endif /* COFF_ENCAPSULATE */ | |
822 | ||
7dd63af1 RS |
823 | if (write (new, &hdr, sizeof hdr) != sizeof hdr) |
824 | { | |
825 | PERROR (new_name); | |
826 | } | |
827 | ||
4baa8a83 | 828 | #if 0 /* This #ifndef caused a bug on Linux when using QMAGIC. */ |
2d30a233 RM |
829 | /* This adjustment was done above only #ifndef NO_REMAP, |
830 | so only undo it now #ifndef NO_REMAP. */ | |
4baa8a83 RS |
831 | /* #ifndef NO_REMAP */ |
832 | #endif | |
7dd63af1 RS |
833 | #ifdef A_TEXT_OFFSET |
834 | hdr.a_text -= A_TEXT_OFFSET (ohdr); | |
835 | #endif | |
836 | ||
837 | return 0; | |
838 | ||
839 | #endif /* not COFF */ | |
840 | } | |
841 | \f | |
842 | /* **************************************************************** | |
843 | * copy_text_and_data | |
844 | * | |
845 | * Copy the text and data segments from memory to the new a.out | |
846 | */ | |
847 | static int | |
848 | copy_text_and_data (new, a_out) | |
849 | int new, a_out; | |
850 | { | |
851 | register char *end; | |
852 | register char *ptr; | |
853 | ||
854 | #ifdef COFF | |
855 | ||
856 | #ifdef USG_SHARED_LIBRARIES | |
857 | ||
858 | int scns; | |
859 | struct scnhdr scntemp; /* Temporary section header */ | |
860 | ||
861 | /* The purpose of this code is to write out the new file's section | |
862 | * contents. | |
863 | * | |
864 | * Step through the section table. If we know the section (.text, | |
865 | * .data) do the appropriate thing. Otherwise, if the section has | |
866 | * no allocated space in the file (.bss), do nothing. Otherwise, | |
867 | * the section has space allocated in the file, and is not a section | |
868 | * we know. So just copy it. | |
869 | */ | |
870 | ||
871 | lseek (a_out, sizeof (struct filehdr) + sizeof (struct aouthdr), 0); | |
872 | ||
873 | for (scns = f_hdr.f_nscns; scns > 0; scns--) | |
874 | { | |
875 | if (read (a_out, &scntemp, sizeof (scntemp)) != sizeof (scntemp)) | |
876 | PERROR ("temacs"); | |
877 | ||
878 | if (!strcmp (scntemp.s_name, ".text")) | |
879 | { | |
880 | lseek (new, (long) text_scnptr, 0); | |
881 | ptr = (char *) f_ohdr.text_start; | |
882 | end = ptr + f_ohdr.tsize; | |
883 | write_segment (new, ptr, end); | |
884 | } | |
885 | else if (!strcmp (scntemp.s_name, ".data")) | |
886 | { | |
887 | lseek (new, (long) data_scnptr, 0); | |
888 | ptr = (char *) f_ohdr.data_start; | |
889 | end = ptr + f_ohdr.dsize; | |
890 | write_segment (new, ptr, end); | |
891 | } | |
892 | else if (!scntemp.s_scnptr) | |
893 | ; /* do nothing - no data for this section */ | |
894 | else | |
895 | { | |
896 | char page[BUFSIZ]; | |
897 | int size, n; | |
898 | long old_a_out_ptr = lseek (a_out, 0, 1); | |
899 | ||
900 | lseek (a_out, scntemp.s_scnptr, 0); | |
901 | for (size = scntemp.s_size; size > 0; size -= sizeof (page)) | |
902 | { | |
903 | n = size > sizeof (page) ? sizeof (page) : size; | |
904 | if (read (a_out, page, n) != n || write (new, page, n) != n) | |
8116bbb0 | 905 | PERROR ("emacs"); |
7dd63af1 RS |
906 | } |
907 | lseek (a_out, old_a_out_ptr, 0); | |
908 | } | |
909 | } | |
910 | ||
911 | #else /* COFF, but not USG_SHARED_LIBRARIES */ | |
912 | ||
8eb2807f RS |
913 | #ifdef MSDOS |
914 | #if __DJGPP__ >= 2 | |
915 | /* Dump the original table of exception handlers, not the one | |
916 | where our exception hooks are registered. */ | |
917 | __djgpp_exception_toggle (); | |
c17a2102 KH |
918 | |
919 | /* Switch off startup flags that might have been set at runtime | |
920 | and which might change the way that dumped Emacs works. */ | |
921 | save_djgpp_startup_flags = _crt0_startup_flags; | |
922 | _crt0_startup_flags &= ~(_CRT0_FLAG_NO_LFN | _CRT0_FLAG_NEARPTR); | |
8eb2807f RS |
923 | #endif |
924 | #endif | |
925 | ||
7dd63af1 RS |
926 | lseek (new, (long) text_scnptr, 0); |
927 | ptr = (char *) f_ohdr.text_start; | |
928 | #ifdef HEADER_INCL_IN_TEXT | |
929 | /* For Gould UTX/32, text starts after headers */ | |
930 | ptr = (char *) (ptr + text_scnptr); | |
931 | #endif /* HEADER_INCL_IN_TEXT */ | |
932 | end = ptr + f_ohdr.tsize; | |
933 | write_segment (new, ptr, end); | |
934 | ||
935 | lseek (new, (long) data_scnptr, 0); | |
936 | ptr = (char *) f_ohdr.data_start; | |
937 | end = ptr + f_ohdr.dsize; | |
938 | write_segment (new, ptr, end); | |
939 | ||
8eb2807f RS |
940 | #ifdef MSDOS |
941 | #if __DJGPP__ >= 2 | |
942 | /* Restore our exception hooks. */ | |
943 | __djgpp_exception_toggle (); | |
c17a2102 KH |
944 | |
945 | /* Restore the startup flags. */ | |
946 | _crt0_startup_flags = save_djgpp_startup_flags; | |
8eb2807f RS |
947 | #endif |
948 | #endif | |
949 | ||
7dd63af1 RS |
950 | #endif /* USG_SHARED_LIBRARIES */ |
951 | ||
952 | #else /* if not COFF */ | |
953 | ||
954 | /* Some machines count the header as part of the text segment. | |
955 | That is to say, the header appears in core | |
f34e2e18 | 956 | just before the address that start_of_text returns. |
7dd63af1 RS |
957 | For them, N_TXTOFF is the place where the header goes. |
958 | We must adjust the seek to the place after the header. | |
959 | Note that at this point hdr.a_text does *not* count | |
960 | the extra A_TEXT_OFFSET bytes, only the actual bytes of code. */ | |
961 | ||
962 | #ifdef A_TEXT_SEEK | |
963 | lseek (new, (long) A_TEXT_SEEK (hdr), 0); | |
964 | #else | |
965 | lseek (new, (long) N_TXTOFF (hdr), 0); | |
966 | #endif /* no A_TEXT_SEEK */ | |
967 | ||
52a2b13b RS |
968 | #ifdef RISCiX |
969 | ||
970 | /* Acorn's RISC-iX has a wacky way of initialising the position of the heap. | |
971 | * There is a little table in crt0.o that is filled at link time with | |
f34e2e18 | 972 | * the min and current brk positions, among other things. When start |
52a2b13b RS |
973 | * runs, it copies the table to where these parameters live during |
974 | * execution. This data is in text space, so it cannot be modified here | |
975 | * before saving the executable, so the data is written manually. In | |
8e6208c5 KH |
976 | * addition, the table does not have a label, and the nearest accessible |
977 | * label (mcount) is not prefixed with a '_', thus making it inaccessible | |
52a2b13b RS |
978 | * from within C programs. To overcome this, emacs's executable is passed |
979 | * through the command 'nm %s | fgrep mcount' into a pipe, and the | |
980 | * resultant output is then used to find the address of 'mcount'. As far as | |
981 | * is possible to determine, in RISC-iX releases prior to 1.2, the negative | |
982 | * offset of the table from mcount is 0x2c, whereas from 1.2 onwards it is | |
983 | * 0x30. bss_end has been rounded up to page boundary. This solution is | |
984 | * based on suggestions made by Kevin Welton and Steve Hunt of Acorn, and | |
985 | * avoids the need for a custom version of crt0.o for emacs which has its | |
986 | * table in data space. | |
987 | */ | |
988 | ||
989 | { | |
990 | char command[1024]; | |
991 | char errbuf[1024]; | |
992 | char address_text[32]; | |
993 | int proforma[4]; | |
994 | FILE *pfile; | |
995 | char *temp_ptr; | |
996 | char c; | |
997 | int mcount_address, mcount_offset, count; | |
998 | extern char *_execname; | |
999 | ||
1000 | ||
1001 | /* The use of _execname is incompatible with RISCiX 1.1 */ | |
1002 | sprintf (command, "nm %s | fgrep mcount", _execname); | |
1003 | ||
1004 | if ( (pfile = popen(command, "r")) == NULL) | |
1005 | { | |
1006 | sprintf (errbuf, "Could not open pipe"); | |
1007 | PERROR (errbuf); | |
1008 | } | |
1009 | ||
1010 | count=0; | |
1011 | while ( ((c=getc(pfile)) != EOF) && (c != ' ') && (count < 31)) | |
1012 | address_text[count++]=c; | |
1013 | address_text[count]=0; | |
1014 | ||
1015 | if ((count == 0) || pclose(pfile) != NULL) | |
1016 | { | |
1017 | sprintf (errbuf, "Failed to execute the command '%s'\n", command); | |
1018 | PERROR (errbuf); | |
1019 | } | |
1020 | ||
1021 | sscanf(address_text, "%x", &mcount_address); | |
1022 | ptr = (char *) unexec_text_start; | |
1023 | mcount_offset = (char *)mcount_address - ptr; | |
1024 | ||
1025 | #ifdef RISCiX_1_1 | |
1026 | #define EDATA_OFFSET 0x2c | |
1027 | #else | |
1028 | #define EDATA_OFFSET 0x30 | |
1029 | #endif | |
1030 | ||
1031 | end = ptr + mcount_offset - EDATA_OFFSET; | |
52a2b13b RS |
1032 | |
1033 | write_segment (new, ptr, end); | |
1034 | ||
1035 | proforma[0] = bss_end; /* becomes _edata */ | |
1036 | proforma[1] = bss_end; /* becomes _end */ | |
1037 | proforma[2] = bss_end; /* becomes _minbrk */ | |
1038 | proforma[3] = bss_end; /* becomes _curbrk */ | |
1039 | ||
52a2b13b RS |
1040 | write (new, proforma, 16); |
1041 | ||
1042 | temp_ptr = ptr; | |
1043 | ptr = end + 16; | |
1044 | end = temp_ptr + hdr.a_text; | |
1045 | ||
52a2b13b RS |
1046 | write_segment (new, ptr, end); |
1047 | } | |
1048 | ||
1049 | #else /* !RISCiX */ | |
7dd63af1 RS |
1050 | ptr = (char *) unexec_text_start; |
1051 | end = ptr + hdr.a_text; | |
1052 | write_segment (new, ptr, end); | |
52a2b13b | 1053 | #endif /* RISCiX */ |
7dd63af1 RS |
1054 | |
1055 | ptr = (char *) unexec_data_start; | |
1056 | end = ptr + hdr.a_data; | |
1057 | /* This lseek is certainly incorrect when A_TEXT_OFFSET | |
1058 | and I believe it is a no-op otherwise. | |
1059 | Let's see if its absence ever fails. */ | |
1060 | /* lseek (new, (long) N_TXTOFF (hdr) + hdr.a_text, 0); */ | |
1061 | write_segment (new, ptr, end); | |
1062 | ||
1063 | #endif /* not COFF */ | |
1064 | ||
1065 | return 0; | |
1066 | } | |
1067 | ||
1068 | write_segment (new, ptr, end) | |
1069 | int new; | |
1070 | register char *ptr, *end; | |
1071 | { | |
1072 | register int i, nwrite, ret; | |
1073 | char buf[80]; | |
1074 | extern int errno; | |
5a31e1d0 RS |
1075 | /* This is the normal amount to write at once. |
1076 | It is the size of block that NFS uses. */ | |
1077 | int writesize = 1 << 13; | |
68db0173 | 1078 | int pagesize = getpagesize (); |
5a31e1d0 | 1079 | char zeros[1 << 13]; |
7dd63af1 | 1080 | |
5a31e1d0 | 1081 | bzero (zeros, sizeof (zeros)); |
7dd63af1 RS |
1082 | |
1083 | for (i = 0; ptr < end;) | |
1084 | { | |
5a31e1d0 RS |
1085 | /* Distance to next multiple of writesize. */ |
1086 | nwrite = (((int) ptr + writesize) & -writesize) - (int) ptr; | |
7dd63af1 RS |
1087 | /* But not beyond specified end. */ |
1088 | if (nwrite > end - ptr) nwrite = end - ptr; | |
1089 | ret = write (new, ptr, nwrite); | |
1090 | /* If write gets a page fault, it means we reached | |
1091 | a gap between the old text segment and the old data segment. | |
1092 | This gap has probably been remapped into part of the text segment. | |
1093 | So write zeros for it. */ | |
3680bdc6 RS |
1094 | if (ret == -1 |
1095 | #ifdef EFAULT | |
1096 | && errno == EFAULT | |
1097 | #endif | |
1098 | ) | |
5a31e1d0 RS |
1099 | { |
1100 | /* Write only a page of zeros at once, | |
1101 | so that we we don't overshoot the start | |
1102 | of the valid memory in the old data segment. */ | |
1103 | if (nwrite > pagesize) | |
1104 | nwrite = pagesize; | |
1105 | write (new, zeros, nwrite); | |
1106 | } | |
1107 | #if 0 /* Now that we have can ask `write' to write more than a page, | |
1108 | it is legit for write do less than the whole amount specified. */ | |
7dd63af1 RS |
1109 | else if (nwrite != ret) |
1110 | { | |
1111 | sprintf (buf, | |
1112 | "unexec write failure: addr 0x%x, fileno %d, size 0x%x, wrote 0x%x, errno %d", | |
1113 | ptr, new, nwrite, ret, errno); | |
1114 | PERROR (buf); | |
1115 | } | |
5a31e1d0 | 1116 | #endif |
7dd63af1 RS |
1117 | i += nwrite; |
1118 | ptr += nwrite; | |
1119 | } | |
1120 | } | |
1121 | \f | |
1122 | /* **************************************************************** | |
1123 | * copy_sym | |
1124 | * | |
1125 | * Copy the relocation information and symbol table from the a.out to the new | |
1126 | */ | |
1127 | static int | |
1128 | copy_sym (new, a_out, a_name, new_name) | |
1129 | int new, a_out; | |
1130 | char *a_name, *new_name; | |
1131 | { | |
1132 | char page[1024]; | |
1133 | int n; | |
1134 | ||
1135 | if (a_out < 0) | |
1136 | return 0; | |
1137 | ||
1138 | #ifdef COFF | |
1139 | if (SYMS_START == 0L) | |
1140 | return 0; | |
1141 | #endif /* COFF */ | |
1142 | ||
1143 | #ifdef COFF | |
1144 | if (lnnoptr) /* if there is line number info */ | |
c8b14b5f | 1145 | lseek (a_out, coff_offset + lnnoptr, 0); /* start copying from there */ |
7dd63af1 | 1146 | else |
c8b14b5f RS |
1147 | lseek (a_out, coff_offset + SYMS_START, 0); /* Position a.out to symtab. */ |
1148 | #else /* not COFF */ | |
1149 | lseek (a_out, SYMS_START, 0); /* Position a.out to symtab. */ | |
1150 | #endif /* not COFF */ | |
7dd63af1 RS |
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 | \f | |
1166 | /* **************************************************************** | |
1167 | * mark_x | |
1168 | * | |
eb8c3be9 | 1169 | * After successfully building the new a.out, mark it executable |
7dd63af1 RS |
1170 | */ |
1171 | static void | |
1172 | mark_x (name) | |
1173 | char *name; | |
1174 | { | |
1175 | struct stat sbuf; | |
1176 | int um; | |
1177 | int new = 0; /* for PERROR */ | |
1178 | ||
1179 | um = umask (777); | |
1180 | umask (um); | |
1181 | if (stat (name, &sbuf) == -1) | |
1182 | { | |
1183 | PERROR (name); | |
1184 | } | |
1185 | sbuf.st_mode |= 0111 & ~um; | |
1186 | if (chmod (name, sbuf.st_mode) == -1) | |
1187 | PERROR (name); | |
1188 | } | |
1189 | \f | |
1190 | #ifdef COFF | |
1191 | #ifndef COFF_BSD_SYMBOLS | |
1192 | ||
1193 | /* | |
1194 | * If the COFF file contains a symbol table and a line number section, | |
1195 | * then any auxiliary entries that have values for x_lnnoptr must | |
1196 | * be adjusted by the amount that the line number section has moved | |
1197 | * in the file (bias computed in make_hdr). The #@$%&* designers of | |
1198 | * the auxiliary entry structures used the absolute file offsets for | |
1199 | * the line number entry rather than an offset from the start of the | |
1200 | * line number section! | |
1201 | * | |
1202 | * When I figure out how to scan through the symbol table and pick out | |
1203 | * the auxiliary entries that need adjustment, this routine will | |
1204 | * be fixed. As it is now, all such entries are wrong and sdb | |
1205 | * will complain. Fred Fish, UniSoft Systems Inc. | |
1206 | */ | |
1207 | ||
1208 | /* This function is probably very slow. Instead of reopening the new | |
1209 | file for input and output it should copy from the old to the new | |
1210 | using the two descriptors already open (WRITEDESC and READDESC). | |
1211 | Instead of reading one small structure at a time it should use | |
1212 | a reasonable size buffer. But I don't have time to work on such | |
1213 | things, so I am installing it as submitted to me. -- RMS. */ | |
1214 | ||
1215 | adjust_lnnoptrs (writedesc, readdesc, new_name) | |
1216 | int writedesc; | |
1217 | int readdesc; | |
1218 | char *new_name; | |
1219 | { | |
1220 | register int nsyms; | |
1221 | register int new; | |
91bac16a | 1222 | #if defined (amdahl_uts) || defined (pfa) |
7dd63af1 RS |
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 | ||
3680bdc6 RS |
1233 | #ifdef MSDOS |
1234 | if ((new = writedesc) < 0) | |
1235 | #else | |
2d30a233 | 1236 | if ((new = open (new_name, O_RDWR)) < 0) |
3680bdc6 | 1237 | #endif |
7dd63af1 RS |
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++; | |
1ba3de00 RS |
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 | } | |
7dd63af1 RS |
1257 | } |
1258 | } | |
3680bdc6 | 1259 | #ifndef MSDOS |
7dd63af1 | 1260 | close (new); |
3680bdc6 RS |
1261 | #endif |
1262 | return 0; | |
7dd63af1 RS |
1263 | } |
1264 | ||
1265 | #endif /* COFF_BSD_SYMBOLS */ | |
1266 | ||
1267 | #endif /* COFF */ | |
1268 | ||
7dd63af1 | 1269 | #endif /* not CANNOT_DUMP */ |