Commit | Line | Data |
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429ab54e | 1 | /* Copyright (C) 1985, 1986, 1987, 1988, 1992, 1993, 1994, 2001, 2002, 2003, |
8cabe764 | 2 | 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc. |
7dd63af1 RS |
3 | |
4 | This file is part of GNU Emacs. | |
5 | ||
9ec0b715 | 6 | GNU Emacs is free software: you can redistribute it and/or modify |
7dd63af1 | 7 | it under the terms of the GNU General Public License as published by |
9ec0b715 GM |
8 | the Free Software Foundation, either version 3 of the License, or |
9 | (at your option) any later version. | |
7dd63af1 RS |
10 | |
11 | GNU Emacs is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
9ec0b715 | 17 | along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */ |
7dd63af1 RS |
18 | |
19 | ||
20 | /* | |
21 | * unexec.c - Convert a running program into an a.out file. | |
22 | * | |
23 | * Author: Spencer W. Thomas | |
24 | * Computer Science Dept. | |
25 | * University of Utah | |
26 | * Date: Tue Mar 2 1982 | |
27 | * Modified heavily since then. | |
28 | * | |
29 | * Synopsis: | |
30 | * unexec (new_name, a_name, data_start, bss_start, entry_address) | |
31 | * char *new_name, *a_name; | |
32 | * unsigned data_start, bss_start, entry_address; | |
33 | * | |
34 | * Takes a snapshot of the program and makes an a.out format file in the | |
35 | * file named by the string argument new_name. | |
36 | * If a_name is non-NULL, the symbol table will be taken from the given file. | |
37 | * On some machines, an existing a_name file is required. | |
38 | * | |
39 | * The boundaries within the a.out file may be adjusted with the data_start | |
40 | * and bss_start arguments. Either or both may be given as 0 for defaults. | |
41 | * | |
42 | * Data_start gives the boundary between the text segment and the data | |
43 | * segment of the program. The text segment can contain shared, read-only | |
44 | * program code and literal data, while the data segment is always unshared | |
45 | * and unprotected. Data_start gives the lowest unprotected address. | |
46 | * The value you specify may be rounded down to a suitable boundary | |
47 | * as required by the machine you are using. | |
48 | * | |
49 | * Specifying zero for data_start means the boundary between text and data | |
50 | * should not be the same as when the program was loaded. | |
51 | * If NO_REMAP is defined, the argument data_start is ignored and the | |
52 | * segment boundaries are never changed. | |
53 | * | |
54 | * Bss_start indicates how much of the data segment is to be saved in the | |
55 | * a.out file and restored when the program is executed. It gives the lowest | |
56 | * unsaved address, and is rounded up to a page boundary. The default when 0 | |
57 | * is given assumes that the entire data segment is to be stored, including | |
58 | * the previous data and bss as well as any additional storage allocated with | |
59 | * break (2). | |
60 | * | |
61 | * The new file is set up to start at entry_address. | |
62 | * | |
63 | * If you make improvements I'd like to get them too. | |
64 | * harpo!utah-cs!thomas, thomas@Utah-20 | |
65 | * | |
66 | */ | |
67 | ||
68 | /* Modified to support SysVr3 shared libraries by James Van Artsdalen | |
69 | * of Dell Computer Corporation. james@bigtex.cactus.org. | |
70 | */ | |
71 | ||
72 | /* There are several compilation parameters affecting unexec: | |
73 | ||
74 | * COFF | |
75 | ||
76 | Define this if your system uses COFF for executables. | |
265a9e55 | 77 | |
7dd63af1 RS |
78 | * NO_REMAP |
79 | ||
80 | Define this if you do not want to try to save Emacs's pure data areas | |
81 | as part of the text segment. | |
82 | ||
83 | Saving them as text is good because it allows users to share more. | |
84 | ||
85 | However, on machines that locate the text area far from the data area, | |
86 | the boundary cannot feasibly be moved. Such machines require | |
87 | NO_REMAP. | |
88 | ||
89 | Also, remapping can cause trouble with the built-in startup routine | |
90 | /lib/crt0.o, which defines `environ' as an initialized variable. | |
91 | Dumping `environ' as pure does not work! So, to use remapping, | |
92 | you must write a startup routine for your machine in Emacs's crt0.c. | |
93 | If NO_REMAP is defined, Emacs uses the system's crt0.o. | |
94 | ||
95 | * SECTION_ALIGNMENT | |
96 | ||
97 | Some machines that use COFF executables require that each section | |
98 | start on a certain boundary *in the COFF file*. Such machines should | |
99 | define SECTION_ALIGNMENT to a mask of the low-order bits that must be | |
100 | zero on such a boundary. This mask is used to control padding between | |
101 | segments in the COFF file. | |
102 | ||
103 | If SECTION_ALIGNMENT is not defined, the segments are written | |
104 | consecutively with no attempt at alignment. This is right for | |
105 | unmodified system V. | |
106 | ||
107 | * SEGMENT_MASK | |
108 | ||
109 | Some machines require that the beginnings and ends of segments | |
110 | *in core* be on certain boundaries. For most machines, a page | |
111 | boundary is sufficient. That is the default. When a larger | |
112 | boundary is needed, define SEGMENT_MASK to a mask of | |
113 | the bits that must be zero on such a boundary. | |
114 | ||
115 | * A_TEXT_OFFSET(HDR) | |
116 | ||
117 | Some machines count the a.out header as part of the size of the text | |
118 | segment (a_text); they may actually load the header into core as the | |
119 | first data in the text segment. Some have additional padding between | |
120 | the header and the real text of the program that is counted in a_text. | |
121 | ||
122 | For these machines, define A_TEXT_OFFSET(HDR) to examine the header | |
123 | structure HDR and return the number of bytes to add to `a_text' | |
124 | before writing it (above and beyond the number of bytes of actual | |
125 | program text). HDR's standard fields are already correct, except that | |
126 | this adjustment to the `a_text' field has not yet been made; | |
127 | thus, the amount of offset can depend on the data in the file. | |
177c0ea7 | 128 | |
7dd63af1 RS |
129 | * A_TEXT_SEEK(HDR) |
130 | ||
131 | If defined, this macro specifies the number of bytes to seek into the | |
2d30a233 | 132 | a.out file before starting to write the text segment. |
7dd63af1 | 133 | |
7dd63af1 RS |
134 | * ADJUST_EXEC_HEADER |
135 | ||
136 | This macro can be used to generate statements to adjust or | |
137 | initialize nonstandard fields in the file header | |
138 | ||
139 | * ADDR_CORRECT(ADDR) | |
140 | ||
141 | Macro to correct an int which is the bit pattern of a pointer to a byte | |
142 | into an int which is the number of a byte. | |
143 | ||
144 | This macro has a default definition which is usually right. | |
145 | This default definition is a no-op on most machines (where a | |
146 | pointer looks like an int) but not on all machines. | |
147 | ||
148 | */ | |
149 | ||
150 | #ifndef emacs | |
151 | #define PERROR(arg) perror (arg); return -1 | |
152 | #else | |
18160b98 | 153 | #include <config.h> |
7dd63af1 RS |
154 | #define PERROR(file) report_error (file, new) |
155 | #endif | |
156 | ||
157 | #ifndef CANNOT_DUMP /* all rest of file! */ | |
158 | ||
077907d4 | 159 | #if defined(COFF) && defined(HAVE_COFF_H) |
2a4487ac | 160 | #include <coff.h> |
3680bdc6 | 161 | #ifdef MSDOS |
8eb2807f RS |
162 | #if __DJGPP__ > 1 |
163 | #include <fcntl.h> /* for O_RDONLY, O_RDWR */ | |
c17a2102 KH |
164 | #include <crt0.h> /* for _crt0_startup_flags and its bits */ |
165 | static int save_djgpp_startup_flags; | |
8d228cb0 | 166 | #endif /* __DJGPP__ > 1 */ |
3680bdc6 RS |
167 | #define filehdr external_filehdr |
168 | #define scnhdr external_scnhdr | |
169 | #define syment external_syment | |
170 | #define auxent external_auxent | |
171 | #define n_numaux e_numaux | |
172 | #define n_type e_type | |
173 | struct aouthdr | |
174 | { | |
234d3183 RS |
175 | unsigned short magic; /* type of file */ |
176 | unsigned short vstamp; /* version stamp */ | |
177 | unsigned long tsize; /* text size in bytes, padded to FW bdry*/ | |
178 | unsigned long dsize; /* initialized data " " */ | |
179 | unsigned long bsize; /* uninitialized data " " */ | |
180 | unsigned long entry; /* entry pt. */ | |
181 | unsigned long text_start;/* base of text used for this file */ | |
182 | unsigned long data_start;/* base of data used for this file */ | |
3680bdc6 | 183 | }; |
3680bdc6 | 184 | #endif /* not MSDOS */ |
8d228cb0 | 185 | #else /* not COFF */ |
8d228cb0 | 186 | #include <a.out.h> |
2a4487ac | 187 | #endif /* not COFF */ |
265a9e55 | 188 | |
f34e2e18 RS |
189 | /* Define getpagesize if the system does not. |
190 | Note that this may depend on symbols defined in a.out.h. */ | |
7dd63af1 RS |
191 | #include "getpagesize.h" |
192 | ||
193 | #ifndef makedev /* Try to detect types.h already loaded */ | |
194 | #include <sys/types.h> | |
265a9e55 | 195 | #endif /* makedev */ |
7dd63af1 RS |
196 | #include <stdio.h> |
197 | #include <sys/stat.h> | |
198 | #include <errno.h> | |
199 | ||
f2a77c3a | 200 | #include <sys/file.h> /* Must be after sys/types.h for USG*/ |
2d30a233 RM |
201 | |
202 | #ifdef USG5 | |
203 | #include <fcntl.h> | |
204 | #endif | |
205 | ||
206 | #ifndef O_RDONLY | |
207 | #define O_RDONLY 0 | |
208 | #endif | |
209 | #ifndef O_RDWR | |
210 | #define O_RDWR 2 | |
211 | #endif | |
212 | ||
213 | ||
7dd63af1 RS |
214 | extern char *start_of_text (); /* Start of text */ |
215 | extern char *start_of_data (); /* Start of initialized data */ | |
216 | ||
217 | #ifdef COFF | |
218 | static long block_copy_start; /* Old executable start point */ | |
219 | static struct filehdr f_hdr; /* File header */ | |
220 | static struct aouthdr f_ohdr; /* Optional file header (a.out) */ | |
221 | long bias; /* Bias to add for growth */ | |
222 | long lnnoptr; /* Pointer to line-number info within file */ | |
223 | #define SYMS_START block_copy_start | |
224 | ||
225 | static long text_scnptr; | |
226 | static long data_scnptr; | |
227 | ||
c8b14b5f RS |
228 | static long coff_offset; |
229 | ||
7dd63af1 RS |
230 | #else /* not COFF */ |
231 | ||
232 | extern char *sbrk (); | |
233 | ||
234 | #define SYMS_START ((long) N_SYMOFF (ohdr)) | |
235 | ||
132d0475 | 236 | #if defined (USG) |
7dd63af1 RS |
237 | static struct bhdr hdr, ohdr; |
238 | #define a_magic fmagic | |
239 | #define a_text tsize | |
240 | #define a_data dsize | |
241 | #define a_bss bsize | |
242 | #define a_syms ssize | |
243 | #define a_trsize rtsize | |
244 | #define a_drsize rdsize | |
245 | #define a_entry entry | |
246 | #define N_BADMAG(x) \ | |
247 | (((x).fmagic)!=OMAGIC && ((x).fmagic)!=NMAGIC &&\ | |
248 | ((x).fmagic)!=FMAGIC && ((x).fmagic)!=IMAGIC) | |
249 | #define NEWMAGIC FMAGIC | |
132d0475 | 250 | #else /* not USG */ |
4624371d | 251 | static struct exec hdr, ohdr; |
7dd63af1 | 252 | #define NEWMAGIC ZMAGIC |
132d0475 | 253 | #endif /* not USG */ |
7dd63af1 RS |
254 | |
255 | static int unexec_text_start; | |
256 | static int unexec_data_start; | |
257 | ||
258 | #endif /* not COFF */ | |
259 | ||
260 | static int pagemask; | |
261 | ||
262 | /* Correct an int which is the bit pattern of a pointer to a byte | |
263 | into an int which is the number of a byte. | |
264 | This is a no-op on ordinary machines, but not on all. */ | |
265 | ||
266 | #ifndef ADDR_CORRECT /* Let m-*.h files override this definition */ | |
267 | #define ADDR_CORRECT(x) ((char *)(x) - (char*)0) | |
268 | #endif | |
269 | ||
270 | #ifdef emacs | |
271 | ||
2d30a233 RM |
272 | #include "lisp.h" |
273 | ||
7dd63af1 RS |
274 | static |
275 | report_error (file, fd) | |
276 | char *file; | |
277 | int fd; | |
278 | { | |
279 | if (fd) | |
280 | close (fd); | |
2d30a233 | 281 | report_file_error ("Cannot unexec", Fcons (build_string (file), Qnil)); |
7dd63af1 RS |
282 | } |
283 | #endif /* emacs */ | |
284 | ||
285 | #define ERROR0(msg) report_error_1 (new, msg, 0, 0); return -1 | |
286 | #define ERROR1(msg,x) report_error_1 (new, msg, x, 0); return -1 | |
287 | #define ERROR2(msg,x,y) report_error_1 (new, msg, x, y); return -1 | |
288 | ||
289 | static | |
290 | report_error_1 (fd, msg, a1, a2) | |
291 | int fd; | |
292 | char *msg; | |
293 | int a1, a2; | |
294 | { | |
295 | close (fd); | |
296 | #ifdef emacs | |
297 | error (msg, a1, a2); | |
298 | #else | |
299 | fprintf (stderr, msg, a1, a2); | |
300 | fprintf (stderr, "\n"); | |
301 | #endif | |
302 | } | |
303 | \f | |
304 | static int make_hdr (); | |
305 | static int copy_text_and_data (); | |
306 | static int copy_sym (); | |
307 | static void mark_x (); | |
308 | ||
7dd63af1 RS |
309 | /* **************************************************************** |
310 | * make_hdr | |
311 | * | |
312 | * Make the header in the new a.out from the header in core. | |
313 | * Modify the text and data sizes. | |
314 | */ | |
315 | static int | |
316 | make_hdr (new, a_out, data_start, bss_start, entry_address, a_name, new_name) | |
317 | int new, a_out; | |
318 | unsigned data_start, bss_start, entry_address; | |
319 | char *a_name; | |
320 | char *new_name; | |
321 | { | |
322 | int tem; | |
323 | #ifdef COFF | |
324 | auto struct scnhdr f_thdr; /* Text section header */ | |
325 | auto struct scnhdr f_dhdr; /* Data section header */ | |
326 | auto struct scnhdr f_bhdr; /* Bss section header */ | |
327 | auto struct scnhdr scntemp; /* Temporary section header */ | |
328 | register int scns; | |
329 | #endif /* COFF */ | |
7dd63af1 | 330 | unsigned int bss_end; |
7dd63af1 RS |
331 | |
332 | pagemask = getpagesize () - 1; | |
333 | ||
334 | /* Adjust text/data boundary. */ | |
335 | #ifdef NO_REMAP | |
336 | data_start = (int) start_of_data (); | |
337 | #else /* not NO_REMAP */ | |
338 | if (!data_start) | |
339 | data_start = (int) start_of_data (); | |
340 | #endif /* not NO_REMAP */ | |
341 | data_start = ADDR_CORRECT (data_start); | |
342 | ||
343 | #ifdef SEGMENT_MASK | |
344 | data_start = data_start & ~SEGMENT_MASK; /* (Down) to segment boundary. */ | |
345 | #else | |
346 | data_start = data_start & ~pagemask; /* (Down) to page boundary. */ | |
347 | #endif | |
348 | ||
349 | bss_end = ADDR_CORRECT (sbrk (0)) + pagemask; | |
350 | bss_end &= ~ pagemask; | |
351 | ||
352 | /* Adjust data/bss boundary. */ | |
353 | if (bss_start != 0) | |
354 | { | |
355 | bss_start = (ADDR_CORRECT (bss_start) + pagemask); | |
356 | /* (Up) to page bdry. */ | |
357 | bss_start &= ~ pagemask; | |
358 | if (bss_start > bss_end) | |
359 | { | |
360 | ERROR1 ("unexec: Specified bss_start (%u) is past end of program", | |
361 | bss_start); | |
362 | } | |
363 | } | |
364 | else | |
365 | bss_start = bss_end; | |
366 | ||
367 | if (data_start > bss_start) /* Can't have negative data size. */ | |
368 | { | |
369 | ERROR2 ("unexec: data_start (%u) can't be greater than bss_start (%u)", | |
370 | data_start, bss_start); | |
371 | } | |
372 | ||
373 | #ifdef COFF | |
c8b14b5f RS |
374 | coff_offset = 0L; /* stays zero, except in DJGPP */ |
375 | ||
7dd63af1 RS |
376 | /* Salvage as much info from the existing file as possible */ |
377 | if (a_out >= 0) | |
378 | { | |
c8b14b5f RS |
379 | #ifdef MSDOS |
380 | #if __DJGPP__ > 1 | |
381 | /* Support the coff-go32-exe format with a prepended stub, since | |
382 | this is what GCC 2.8.0 and later generates by default in DJGPP. */ | |
383 | unsigned short mz_header[3]; | |
384 | ||
385 | if (read (a_out, &mz_header, sizeof (mz_header)) != sizeof (mz_header)) | |
386 | { | |
387 | PERROR (a_name); | |
388 | } | |
389 | if (mz_header[0] == 0x5a4d || mz_header[0] == 0x4d5a) /* "MZ" or "ZM" */ | |
390 | { | |
391 | coff_offset = (long)mz_header[2] * 512L; | |
392 | if (mz_header[1]) | |
393 | coff_offset += (long)mz_header[1] - 512L; | |
394 | lseek (a_out, coff_offset, 0); | |
395 | } | |
396 | else | |
397 | lseek (a_out, 0L, 0); | |
398 | #endif /* __DJGPP__ > 1 */ | |
399 | #endif /* MSDOS */ | |
7dd63af1 RS |
400 | if (read (a_out, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) |
401 | { | |
402 | PERROR (a_name); | |
403 | } | |
404 | block_copy_start += sizeof (f_hdr); | |
405 | if (f_hdr.f_opthdr > 0) | |
406 | { | |
407 | if (read (a_out, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) | |
408 | { | |
409 | PERROR (a_name); | |
410 | } | |
411 | block_copy_start += sizeof (f_ohdr); | |
412 | } | |
413 | /* Loop through section headers, copying them in */ | |
c8b14b5f | 414 | lseek (a_out, coff_offset + sizeof (f_hdr) + f_hdr.f_opthdr, 0); |
7dd63af1 RS |
415 | for (scns = f_hdr.f_nscns; scns > 0; scns--) { |
416 | if (read (a_out, &scntemp, sizeof (scntemp)) != sizeof (scntemp)) | |
417 | { | |
418 | PERROR (a_name); | |
419 | } | |
420 | if (scntemp.s_scnptr > 0L) | |
421 | { | |
422 | if (block_copy_start < scntemp.s_scnptr + scntemp.s_size) | |
423 | block_copy_start = scntemp.s_scnptr + scntemp.s_size; | |
424 | } | |
425 | if (strcmp (scntemp.s_name, ".text") == 0) | |
426 | { | |
427 | f_thdr = scntemp; | |
428 | } | |
429 | else if (strcmp (scntemp.s_name, ".data") == 0) | |
430 | { | |
431 | f_dhdr = scntemp; | |
432 | } | |
433 | else if (strcmp (scntemp.s_name, ".bss") == 0) | |
434 | { | |
435 | f_bhdr = scntemp; | |
436 | } | |
437 | } | |
438 | } | |
439 | else | |
440 | { | |
441 | ERROR0 ("can't build a COFF file from scratch yet"); | |
442 | } | |
443 | ||
444 | /* Now we alter the contents of all the f_*hdr variables | |
445 | to correspond to what we want to dump. */ | |
446 | ||
7dd63af1 | 447 | f_hdr.f_flags |= (F_RELFLG | F_EXEC); |
7dd63af1 RS |
448 | #ifndef NO_REMAP |
449 | f_ohdr.text_start = (long) start_of_text (); | |
450 | f_ohdr.tsize = data_start - f_ohdr.text_start; | |
451 | f_ohdr.data_start = data_start; | |
452 | #endif /* NO_REMAP */ | |
453 | f_ohdr.dsize = bss_start - f_ohdr.data_start; | |
454 | f_ohdr.bsize = bss_end - bss_start; | |
7dd63af1 RS |
455 | /* On some machines, the old values are right. |
456 | ??? Maybe on all machines with NO_REMAP. */ | |
457 | f_thdr.s_size = f_ohdr.tsize; | |
458 | f_thdr.s_scnptr = sizeof (f_hdr) + sizeof (f_ohdr); | |
459 | f_thdr.s_scnptr += (f_hdr.f_nscns) * (sizeof (f_thdr)); | |
7dd63af1 RS |
460 | lnnoptr = f_thdr.s_lnnoptr; |
461 | #ifdef SECTION_ALIGNMENT | |
462 | /* Some systems require special alignment | |
463 | of the sections in the file itself. */ | |
464 | f_thdr.s_scnptr | |
465 | = (f_thdr.s_scnptr + SECTION_ALIGNMENT) & ~SECTION_ALIGNMENT; | |
466 | #endif /* SECTION_ALIGNMENT */ | |
7dd63af1 | 467 | text_scnptr = f_thdr.s_scnptr; |
7dd63af1 | 468 | f_dhdr.s_paddr = f_ohdr.data_start; |
7dd63af1 RS |
469 | f_dhdr.s_vaddr = f_ohdr.data_start; |
470 | f_dhdr.s_size = f_ohdr.dsize; | |
471 | f_dhdr.s_scnptr = f_thdr.s_scnptr + f_thdr.s_size; | |
472 | #ifdef SECTION_ALIGNMENT | |
473 | /* Some systems require special alignment | |
474 | of the sections in the file itself. */ | |
475 | f_dhdr.s_scnptr | |
476 | = (f_dhdr.s_scnptr + SECTION_ALIGNMENT) & ~SECTION_ALIGNMENT; | |
477 | #endif /* SECTION_ALIGNMENT */ | |
478 | #ifdef DATA_SECTION_ALIGNMENT | |
479 | /* Some systems require special alignment | |
480 | of the data section only. */ | |
481 | f_dhdr.s_scnptr | |
482 | = (f_dhdr.s_scnptr + DATA_SECTION_ALIGNMENT) & ~DATA_SECTION_ALIGNMENT; | |
483 | #endif /* DATA_SECTION_ALIGNMENT */ | |
484 | data_scnptr = f_dhdr.s_scnptr; | |
7dd63af1 | 485 | f_bhdr.s_paddr = f_ohdr.data_start + f_ohdr.dsize; |
7dd63af1 RS |
486 | f_bhdr.s_vaddr = f_ohdr.data_start + f_ohdr.dsize; |
487 | f_bhdr.s_size = f_ohdr.bsize; | |
488 | f_bhdr.s_scnptr = 0L; | |
7dd63af1 | 489 | bias = f_dhdr.s_scnptr + f_dhdr.s_size - block_copy_start; |
7dd63af1 RS |
490 | |
491 | if (f_hdr.f_symptr > 0L) | |
492 | { | |
493 | f_hdr.f_symptr += bias; | |
494 | } | |
495 | ||
496 | if (f_thdr.s_lnnoptr > 0L) | |
497 | { | |
498 | f_thdr.s_lnnoptr += bias; | |
499 | } | |
500 | ||
501 | #ifdef ADJUST_EXEC_HEADER | |
502 | ADJUST_EXEC_HEADER; | |
503 | #endif /* ADJUST_EXEC_HEADER */ | |
504 | ||
505 | if (write (new, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) | |
506 | { | |
507 | PERROR (new_name); | |
508 | } | |
509 | ||
510 | if (write (new, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) | |
511 | { | |
512 | PERROR (new_name); | |
513 | } | |
514 | ||
7dd63af1 RS |
515 | if (write (new, &f_thdr, sizeof (f_thdr)) != sizeof (f_thdr)) |
516 | { | |
517 | PERROR (new_name); | |
518 | } | |
519 | ||
520 | if (write (new, &f_dhdr, sizeof (f_dhdr)) != sizeof (f_dhdr)) | |
521 | { | |
522 | PERROR (new_name); | |
523 | } | |
524 | ||
525 | if (write (new, &f_bhdr, sizeof (f_bhdr)) != sizeof (f_bhdr)) | |
526 | { | |
527 | PERROR (new_name); | |
528 | } | |
529 | ||
7dd63af1 RS |
530 | return (0); |
531 | ||
532 | #else /* if not COFF */ | |
533 | ||
534 | /* Get symbol table info from header of a.out file if given one. */ | |
535 | if (a_out >= 0) | |
536 | { | |
537 | if (read (a_out, &ohdr, sizeof hdr) != sizeof hdr) | |
538 | { | |
539 | PERROR (a_name); | |
540 | } | |
541 | ||
542 | if (N_BADMAG (ohdr)) | |
543 | { | |
544 | ERROR1 ("invalid magic number in %s", a_name); | |
545 | } | |
546 | hdr = ohdr; | |
547 | } | |
548 | else | |
549 | { | |
3680bdc6 RS |
550 | #ifdef MSDOS /* Demacs 1.1.1 91/10/16 HIRANO Satoshi */ |
551 | bzero ((void *)&hdr, sizeof hdr); | |
265a9e55 | 552 | #else |
a5fd213f | 553 | bzero (&hdr, sizeof hdr); |
265a9e55 | 554 | #endif |
7dd63af1 RS |
555 | } |
556 | ||
557 | unexec_text_start = (long) start_of_text (); | |
558 | unexec_data_start = data_start; | |
559 | ||
560 | /* Machine-dependent fixup for header, or maybe for unexec_text_start */ | |
561 | #ifdef ADJUST_EXEC_HEADER | |
562 | ADJUST_EXEC_HEADER; | |
563 | #endif /* ADJUST_EXEC_HEADER */ | |
564 | ||
565 | hdr.a_trsize = 0; | |
566 | hdr.a_drsize = 0; | |
567 | if (entry_address != 0) | |
568 | hdr.a_entry = entry_address; | |
569 | ||
570 | hdr.a_bss = bss_end - bss_start; | |
571 | hdr.a_data = bss_start - data_start; | |
572 | #ifdef NO_REMAP | |
573 | hdr.a_text = ohdr.a_text; | |
574 | #else /* not NO_REMAP */ | |
575 | hdr.a_text = data_start - unexec_text_start; | |
576 | ||
577 | #ifdef A_TEXT_OFFSET | |
578 | hdr.a_text += A_TEXT_OFFSET (ohdr); | |
579 | #endif | |
580 | ||
581 | #endif /* not NO_REMAP */ | |
582 | ||
583 | if (write (new, &hdr, sizeof hdr) != sizeof hdr) | |
584 | { | |
585 | PERROR (new_name); | |
586 | } | |
587 | ||
588 | #ifdef A_TEXT_OFFSET | |
589 | hdr.a_text -= A_TEXT_OFFSET (ohdr); | |
590 | #endif | |
591 | ||
592 | return 0; | |
593 | ||
594 | #endif /* not COFF */ | |
595 | } | |
596 | \f | |
730f4d72 EZ |
597 | write_segment (new, ptr, end) |
598 | int new; | |
599 | register char *ptr, *end; | |
600 | { | |
601 | register int i, nwrite, ret; | |
602 | char buf[80]; | |
603 | #ifndef USE_CRT_DLL | |
604 | extern int errno; | |
605 | #endif | |
606 | /* This is the normal amount to write at once. | |
607 | It is the size of block that NFS uses. */ | |
608 | int writesize = 1 << 13; | |
609 | int pagesize = getpagesize (); | |
610 | char zeros[1 << 13]; | |
611 | ||
612 | bzero (zeros, sizeof (zeros)); | |
613 | ||
614 | for (i = 0; ptr < end;) | |
615 | { | |
616 | /* Distance to next multiple of writesize. */ | |
617 | nwrite = (((int) ptr + writesize) & -writesize) - (int) ptr; | |
618 | /* But not beyond specified end. */ | |
619 | if (nwrite > end - ptr) nwrite = end - ptr; | |
620 | ret = write (new, ptr, nwrite); | |
621 | /* If write gets a page fault, it means we reached | |
622 | a gap between the old text segment and the old data segment. | |
623 | This gap has probably been remapped into part of the text segment. | |
624 | So write zeros for it. */ | |
625 | if (ret == -1 | |
626 | #ifdef EFAULT | |
627 | && errno == EFAULT | |
628 | #endif | |
629 | ) | |
630 | { | |
631 | /* Write only a page of zeros at once, | |
632 | so that we we don't overshoot the start | |
633 | of the valid memory in the old data segment. */ | |
634 | if (nwrite > pagesize) | |
635 | nwrite = pagesize; | |
636 | write (new, zeros, nwrite); | |
637 | } | |
638 | #if 0 /* Now that we have can ask `write' to write more than a page, | |
639 | it is legit for write do less than the whole amount specified. */ | |
640 | else if (nwrite != ret) | |
641 | { | |
642 | sprintf (buf, | |
643 | "unexec write failure: addr 0x%x, fileno %d, size 0x%x, wrote 0x%x, errno %d", | |
644 | ptr, new, nwrite, ret, errno); | |
645 | PERROR (buf); | |
646 | } | |
647 | #endif | |
648 | i += nwrite; | |
649 | ptr += nwrite; | |
650 | } | |
651 | } | |
7dd63af1 RS |
652 | /* **************************************************************** |
653 | * copy_text_and_data | |
654 | * | |
655 | * Copy the text and data segments from memory to the new a.out | |
656 | */ | |
657 | static int | |
658 | copy_text_and_data (new, a_out) | |
659 | int new, a_out; | |
660 | { | |
661 | register char *end; | |
662 | register char *ptr; | |
663 | ||
664 | #ifdef COFF | |
665 | ||
8eb2807f RS |
666 | #ifdef MSDOS |
667 | #if __DJGPP__ >= 2 | |
668 | /* Dump the original table of exception handlers, not the one | |
669 | where our exception hooks are registered. */ | |
670 | __djgpp_exception_toggle (); | |
c17a2102 KH |
671 | |
672 | /* Switch off startup flags that might have been set at runtime | |
673 | and which might change the way that dumped Emacs works. */ | |
674 | save_djgpp_startup_flags = _crt0_startup_flags; | |
675 | _crt0_startup_flags &= ~(_CRT0_FLAG_NO_LFN | _CRT0_FLAG_NEARPTR); | |
8eb2807f RS |
676 | #endif |
677 | #endif | |
678 | ||
7dd63af1 RS |
679 | lseek (new, (long) text_scnptr, 0); |
680 | ptr = (char *) f_ohdr.text_start; | |
7dd63af1 RS |
681 | end = ptr + f_ohdr.tsize; |
682 | write_segment (new, ptr, end); | |
683 | ||
684 | lseek (new, (long) data_scnptr, 0); | |
685 | ptr = (char *) f_ohdr.data_start; | |
686 | end = ptr + f_ohdr.dsize; | |
687 | write_segment (new, ptr, end); | |
688 | ||
8eb2807f RS |
689 | #ifdef MSDOS |
690 | #if __DJGPP__ >= 2 | |
691 | /* Restore our exception hooks. */ | |
692 | __djgpp_exception_toggle (); | |
c17a2102 KH |
693 | |
694 | /* Restore the startup flags. */ | |
695 | _crt0_startup_flags = save_djgpp_startup_flags; | |
8eb2807f RS |
696 | #endif |
697 | #endif | |
698 | ||
7dd63af1 RS |
699 | #else /* if not COFF */ |
700 | ||
701 | /* Some machines count the header as part of the text segment. | |
702 | That is to say, the header appears in core | |
f34e2e18 | 703 | just before the address that start_of_text returns. |
7dd63af1 RS |
704 | For them, N_TXTOFF is the place where the header goes. |
705 | We must adjust the seek to the place after the header. | |
706 | Note that at this point hdr.a_text does *not* count | |
707 | the extra A_TEXT_OFFSET bytes, only the actual bytes of code. */ | |
708 | ||
709 | #ifdef A_TEXT_SEEK | |
710 | lseek (new, (long) A_TEXT_SEEK (hdr), 0); | |
711 | #else | |
712 | lseek (new, (long) N_TXTOFF (hdr), 0); | |
713 | #endif /* no A_TEXT_SEEK */ | |
714 | ||
715 | ptr = (char *) unexec_text_start; | |
716 | end = ptr + hdr.a_text; | |
717 | write_segment (new, ptr, end); | |
718 | ||
719 | ptr = (char *) unexec_data_start; | |
720 | end = ptr + hdr.a_data; | |
721 | /* This lseek is certainly incorrect when A_TEXT_OFFSET | |
722 | and I believe it is a no-op otherwise. | |
723 | Let's see if its absence ever fails. */ | |
724 | /* lseek (new, (long) N_TXTOFF (hdr) + hdr.a_text, 0); */ | |
725 | write_segment (new, ptr, end); | |
726 | ||
727 | #endif /* not COFF */ | |
728 | ||
729 | return 0; | |
730 | } | |
7dd63af1 RS |
731 | \f |
732 | /* **************************************************************** | |
733 | * copy_sym | |
734 | * | |
735 | * Copy the relocation information and symbol table from the a.out to the new | |
736 | */ | |
737 | static int | |
738 | copy_sym (new, a_out, a_name, new_name) | |
739 | int new, a_out; | |
740 | char *a_name, *new_name; | |
741 | { | |
742 | char page[1024]; | |
743 | int n; | |
744 | ||
745 | if (a_out < 0) | |
746 | return 0; | |
747 | ||
748 | #ifdef COFF | |
749 | if (SYMS_START == 0L) | |
750 | return 0; | |
751 | #endif /* COFF */ | |
752 | ||
753 | #ifdef COFF | |
754 | if (lnnoptr) /* if there is line number info */ | |
c8b14b5f | 755 | lseek (a_out, coff_offset + lnnoptr, 0); /* start copying from there */ |
7dd63af1 | 756 | else |
c8b14b5f RS |
757 | lseek (a_out, coff_offset + SYMS_START, 0); /* Position a.out to symtab. */ |
758 | #else /* not COFF */ | |
759 | lseek (a_out, SYMS_START, 0); /* Position a.out to symtab. */ | |
760 | #endif /* not COFF */ | |
7dd63af1 RS |
761 | |
762 | while ((n = read (a_out, page, sizeof page)) > 0) | |
763 | { | |
764 | if (write (new, page, n) != n) | |
765 | { | |
766 | PERROR (new_name); | |
767 | } | |
768 | } | |
769 | if (n < 0) | |
770 | { | |
771 | PERROR (a_name); | |
772 | } | |
773 | return 0; | |
774 | } | |
775 | \f | |
776 | /* **************************************************************** | |
777 | * mark_x | |
778 | * | |
eb8c3be9 | 779 | * After successfully building the new a.out, mark it executable |
7dd63af1 RS |
780 | */ |
781 | static void | |
782 | mark_x (name) | |
783 | char *name; | |
784 | { | |
785 | struct stat sbuf; | |
786 | int um; | |
787 | int new = 0; /* for PERROR */ | |
788 | ||
789 | um = umask (777); | |
790 | umask (um); | |
791 | if (stat (name, &sbuf) == -1) | |
792 | { | |
793 | PERROR (name); | |
794 | } | |
795 | sbuf.st_mode |= 0111 & ~um; | |
796 | if (chmod (name, sbuf.st_mode) == -1) | |
797 | PERROR (name); | |
798 | } | |
799 | \f | |
800 | #ifdef COFF | |
801 | #ifndef COFF_BSD_SYMBOLS | |
802 | ||
803 | /* | |
804 | * If the COFF file contains a symbol table and a line number section, | |
805 | * then any auxiliary entries that have values for x_lnnoptr must | |
806 | * be adjusted by the amount that the line number section has moved | |
807 | * in the file (bias computed in make_hdr). The #@$%&* designers of | |
808 | * the auxiliary entry structures used the absolute file offsets for | |
809 | * the line number entry rather than an offset from the start of the | |
810 | * line number section! | |
811 | * | |
812 | * When I figure out how to scan through the symbol table and pick out | |
813 | * the auxiliary entries that need adjustment, this routine will | |
814 | * be fixed. As it is now, all such entries are wrong and sdb | |
815 | * will complain. Fred Fish, UniSoft Systems Inc. | |
816 | */ | |
817 | ||
818 | /* This function is probably very slow. Instead of reopening the new | |
819 | file for input and output it should copy from the old to the new | |
820 | using the two descriptors already open (WRITEDESC and READDESC). | |
821 | Instead of reading one small structure at a time it should use | |
822 | a reasonable size buffer. But I don't have time to work on such | |
823 | things, so I am installing it as submitted to me. -- RMS. */ | |
824 | ||
825 | adjust_lnnoptrs (writedesc, readdesc, new_name) | |
826 | int writedesc; | |
827 | int readdesc; | |
828 | char *new_name; | |
829 | { | |
830 | register int nsyms; | |
831 | register int new; | |
7dd63af1 RS |
832 | struct syment symentry; |
833 | union auxent auxentry; | |
7dd63af1 RS |
834 | |
835 | if (!lnnoptr || !f_hdr.f_symptr) | |
836 | return 0; | |
837 | ||
3680bdc6 RS |
838 | #ifdef MSDOS |
839 | if ((new = writedesc) < 0) | |
840 | #else | |
2d30a233 | 841 | if ((new = open (new_name, O_RDWR)) < 0) |
3680bdc6 | 842 | #endif |
7dd63af1 RS |
843 | { |
844 | PERROR (new_name); | |
845 | return -1; | |
846 | } | |
847 | ||
848 | lseek (new, f_hdr.f_symptr, 0); | |
849 | for (nsyms = 0; nsyms < f_hdr.f_nsyms; nsyms++) | |
850 | { | |
851 | read (new, &symentry, SYMESZ); | |
852 | if (symentry.n_numaux) | |
853 | { | |
854 | read (new, &auxentry, AUXESZ); | |
855 | nsyms++; | |
1ba3de00 RS |
856 | if (ISFCN (symentry.n_type) || symentry.n_type == 0x2400) |
857 | { | |
858 | auxentry.x_sym.x_fcnary.x_fcn.x_lnnoptr += bias; | |
859 | lseek (new, -AUXESZ, 1); | |
860 | write (new, &auxentry, AUXESZ); | |
861 | } | |
7dd63af1 RS |
862 | } |
863 | } | |
3680bdc6 | 864 | #ifndef MSDOS |
7dd63af1 | 865 | close (new); |
3680bdc6 RS |
866 | #endif |
867 | return 0; | |
7dd63af1 RS |
868 | } |
869 | ||
870 | #endif /* COFF_BSD_SYMBOLS */ | |
871 | ||
872 | #endif /* COFF */ | |
873 | ||
730f4d72 EZ |
874 | /* **************************************************************** |
875 | * unexec | |
876 | * | |
877 | * driving logic. | |
878 | */ | |
879 | unexec (new_name, a_name, data_start, bss_start, entry_address) | |
880 | char *new_name, *a_name; | |
881 | unsigned data_start, bss_start, entry_address; | |
882 | { | |
883 | int new, a_out = -1; | |
884 | ||
885 | if (a_name && (a_out = open (a_name, O_RDONLY)) < 0) | |
886 | { | |
887 | PERROR (a_name); | |
888 | } | |
889 | if ((new = creat (new_name, 0666)) < 0) | |
890 | { | |
891 | PERROR (new_name); | |
892 | } | |
893 | ||
894 | if (make_hdr (new, a_out, data_start, bss_start, entry_address, a_name, new_name) < 0 | |
895 | || copy_text_and_data (new, a_out) < 0 | |
896 | || copy_sym (new, a_out, a_name, new_name) < 0 | |
897 | #ifdef COFF | |
898 | #ifndef COFF_BSD_SYMBOLS | |
899 | || adjust_lnnoptrs (new, a_out, new_name) < 0 | |
900 | #endif | |
901 | #endif | |
902 | ) | |
903 | { | |
904 | close (new); | |
905 | /* unlink (new_name); /* Failed, unlink new a.out */ | |
906 | return -1; | |
907 | } | |
908 | ||
909 | close (new); | |
910 | if (a_out >= 0) | |
911 | close (a_out); | |
912 | mark_x (new_name); | |
913 | return 0; | |
914 | } | |
915 | ||
7dd63af1 | 916 | #endif /* not CANNOT_DUMP */ |
ab5796a9 MB |
917 | |
918 | /* arch-tag: 62409b69-e27a-4a7c-9413-0210d6b54e7f | |
919 | (do not change this comment) */ |