Commit | Line | Data |
---|---|---|
4e3a36cd JB |
1 | /* Modified by Andrew.Vignaux@comp.vuw.ac.nz to get it to work :-) */ |
2 | ||
3 | /* Copyright (C) 1985, 1986, 1987, 1988 Free Software Foundation, Inc. | |
4 | ||
3b7ad313 EN |
5 | This file is part of GNU Emacs. |
6 | ||
7 | GNU Emacs is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2, or (at your option) | |
10 | any later version. | |
11 | ||
12 | GNU Emacs is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with GNU Emacs; see the file COPYING. If not, write to | |
19 | the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
20 | Boston, MA 02111-1307, USA. | |
4e3a36cd JB |
21 | |
22 | In other words, you are welcome to use, share and improve this program. | |
23 | You are forbidden to forbid anyone else to use, share and improve | |
24 | what you give them. Help stamp out software-hoarding! */ | |
25 | ||
26 | ||
27 | /* | |
28 | * unexec.c - Convert a running program into an a.out file. | |
29 | * | |
30 | * Author: Spencer W. Thomas | |
31 | * Computer Science Dept. | |
32 | * University of Utah | |
33 | * Date: Tue Mar 2 1982 | |
34 | * Modified heavily since then. | |
35 | * | |
4a438fc5 RS |
36 | * Updated for AIX 4.1.3 by Bill_Mann @ PraxisInt.com, Feb 1996 |
37 | * As of AIX 4.1, text, data, and bss are pre-relocated by the binder in | |
38 | * such a way that the file can be mapped with code in one segment and | |
39 | * data/bss in another segment, without reading or copying the file, by | |
40 | * the AIX exec loader. Padding sections are omitted, nevertheless | |
41 | * small amounts of 'padding' still occurs between sections in the file. | |
42 | * As modified, this code handles both 3.2 and 4.1 conventions. | |
43 | * | |
4e3a36cd JB |
44 | * Synopsis: |
45 | * unexec (new_name, a_name, data_start, bss_start, entry_address) | |
46 | * char *new_name, *a_name; | |
47 | * unsigned data_start, bss_start, entry_address; | |
48 | * | |
49 | * Takes a snapshot of the program and makes an a.out format file in the | |
50 | * file named by the string argument new_name. | |
51 | * If a_name is non-NULL, the symbol table will be taken from the given file. | |
52 | * On some machines, an existing a_name file is required. | |
53 | * | |
54 | * The boundaries within the a.out file may be adjusted with the data_start | |
55 | * and bss_start arguments. Either or both may be given as 0 for defaults. | |
56 | * | |
57 | * Data_start gives the boundary between the text segment and the data | |
58 | * segment of the program. The text segment can contain shared, read-only | |
59 | * program code and literal data, while the data segment is always unshared | |
60 | * and unprotected. Data_start gives the lowest unprotected address. | |
61 | * The value you specify may be rounded down to a suitable boundary | |
62 | * as required by the machine you are using. | |
63 | * | |
64 | * Specifying zero for data_start means the boundary between text and data | |
65 | * should not be the same as when the program was loaded. | |
66 | * If NO_REMAP is defined, the argument data_start is ignored and the | |
67 | * segment boundaries are never changed. | |
68 | * | |
69 | * Bss_start indicates how much of the data segment is to be saved in the | |
70 | * a.out file and restored when the program is executed. It gives the lowest | |
71 | * unsaved address, and is rounded up to a page boundary. The default when 0 | |
72 | * is given assumes that the entire data segment is to be stored, including | |
73 | * the previous data and bss as well as any additional storage allocated with | |
74 | * break (2). | |
75 | * | |
76 | * The new file is set up to start at entry_address. | |
77 | * | |
78 | * If you make improvements I'd like to get them too. | |
79 | * harpo!utah-cs!thomas, thomas@Utah-20 | |
80 | * | |
81 | */ | |
82 | ||
83 | /* There are several compilation parameters affecting unexec: | |
84 | ||
85 | * COFF | |
86 | ||
87 | Define this if your system uses COFF for executables. | |
88 | Otherwise we assume you use Berkeley format. | |
89 | ||
90 | * NO_REMAP | |
91 | ||
92 | Define this if you do not want to try to save Emacs's pure data areas | |
93 | as part of the text segment. | |
94 | ||
95 | Saving them as text is good because it allows users to share more. | |
96 | ||
97 | However, on machines that locate the text area far from the data area, | |
98 | the boundary cannot feasibly be moved. Such machines require | |
99 | NO_REMAP. | |
100 | ||
101 | Also, remapping can cause trouble with the built-in startup routine | |
102 | /lib/crt0.o, which defines `environ' as an initialized variable. | |
103 | Dumping `environ' as pure does not work! So, to use remapping, | |
104 | you must write a startup routine for your machine in Emacs's crt0.c. | |
105 | If NO_REMAP is defined, Emacs uses the system's crt0.o. | |
106 | ||
107 | * SECTION_ALIGNMENT | |
108 | ||
109 | Some machines that use COFF executables require that each section | |
110 | start on a certain boundary *in the COFF file*. Such machines should | |
111 | define SECTION_ALIGNMENT to a mask of the low-order bits that must be | |
112 | zero on such a boundary. This mask is used to control padding between | |
113 | segments in the COFF file. | |
114 | ||
115 | If SECTION_ALIGNMENT is not defined, the segments are written | |
116 | consecutively with no attempt at alignment. This is right for | |
117 | unmodified system V. | |
118 | ||
119 | * SEGMENT_MASK | |
120 | ||
121 | Some machines require that the beginnings and ends of segments | |
122 | *in core* be on certain boundaries. For most machines, a page | |
123 | boundary is sufficient. That is the default. When a larger | |
124 | boundary is needed, define SEGMENT_MASK to a mask of | |
125 | the bits that must be zero on such a boundary. | |
126 | ||
127 | * A_TEXT_OFFSET(HDR) | |
128 | ||
129 | Some machines count the a.out header as part of the size of the text | |
130 | segment (a_text); they may actually load the header into core as the | |
131 | first data in the text segment. Some have additional padding between | |
132 | the header and the real text of the program that is counted in a_text. | |
133 | ||
134 | For these machines, define A_TEXT_OFFSET(HDR) to examine the header | |
135 | structure HDR and return the number of bytes to add to `a_text' | |
136 | before writing it (above and beyond the number of bytes of actual | |
137 | program text). HDR's standard fields are already correct, except that | |
138 | this adjustment to the `a_text' field has not yet been made; | |
139 | thus, the amount of offset can depend on the data in the file. | |
140 | ||
141 | * A_TEXT_SEEK(HDR) | |
142 | ||
143 | If defined, this macro specifies the number of bytes to seek into the | |
144 | a.out file before starting to write the text segment.a | |
145 | ||
146 | * EXEC_MAGIC | |
147 | ||
148 | For machines using COFF, this macro, if defined, is a value stored | |
149 | into the magic number field of the output file. | |
150 | ||
151 | * ADJUST_EXEC_HEADER | |
152 | ||
153 | This macro can be used to generate statements to adjust or | |
154 | initialize nonstandard fields in the file header | |
155 | ||
156 | * ADDR_CORRECT(ADDR) | |
157 | ||
158 | Macro to correct an int which is the bit pattern of a pointer to a byte | |
159 | into an int which is the number of a byte. | |
160 | ||
161 | This macro has a default definition which is usually right. | |
162 | This default definition is a no-op on most machines (where a | |
163 | pointer looks like an int) but not on all machines. | |
164 | ||
8a281f86 RS |
165 | */ |
166 | ||
4e3a36cd JB |
167 | #define XCOFF |
168 | #define COFF | |
169 | #define NO_REMAP | |
76998edb | 170 | |
4e3a36cd JB |
171 | #ifndef emacs |
172 | #define PERROR(arg) perror (arg); return -1 | |
173 | #else | |
18160b98 | 174 | #include <config.h> |
4e3a36cd JB |
175 | #define PERROR(file) report_error (file, new) |
176 | #endif | |
76998edb | 177 | |
4e3a36cd JB |
178 | #include <a.out.h> |
179 | /* Define getpagesize () if the system does not. | |
180 | Note that this may depend on symbols defined in a.out.h | |
181 | */ | |
182 | #include "getpagesize.h" | |
76998edb | 183 | |
4e3a36cd JB |
184 | #ifndef makedev /* Try to detect types.h already loaded */ |
185 | #include <sys/types.h> | |
186 | #endif | |
187 | #include <stdio.h> | |
188 | #include <sys/stat.h> | |
189 | #include <errno.h> | |
190 | ||
191 | extern char *start_of_text (); /* Start of text */ | |
192 | extern char *start_of_data (); /* Start of initialized data */ | |
193 | ||
194 | extern int _data; | |
195 | extern int _edata; | |
196 | extern int _text; | |
197 | extern int _etext; | |
198 | extern int _end; | |
199 | #ifdef COFF | |
200 | #ifndef USG | |
201 | #ifndef STRIDE | |
202 | #ifndef UMAX | |
203 | #ifndef sun386 | |
204 | /* I have a suspicion that these are turned off on all systems | |
205 | and can be deleted. Try it in version 19. */ | |
206 | #include <filehdr.h> | |
207 | #include <aouthdr.h> | |
208 | #include <scnhdr.h> | |
209 | #include <syms.h> | |
210 | #endif /* not sun386 */ | |
211 | #endif /* not UMAX */ | |
212 | #endif /* Not STRIDE */ | |
213 | #endif /* not USG */ | |
4e3a36cd JB |
214 | static struct filehdr f_hdr; /* File header */ |
215 | static struct aouthdr f_ohdr; /* Optional file header (a.out) */ | |
216 | long bias; /* Bias to add for growth */ | |
217 | long lnnoptr; /* Pointer to line-number info within file */ | |
4e3a36cd JB |
218 | |
219 | static long text_scnptr; | |
220 | static long data_scnptr; | |
221 | #ifdef XCOFF | |
4a438fc5 | 222 | #define ALIGN(val, pwr) (((val) + ((1L<<(pwr))-1)) & ~((1L<<(pwr))-1)) |
4e3a36cd JB |
223 | static long load_scnptr; |
224 | static long orig_load_scnptr; | |
225 | static long orig_data_scnptr; | |
226 | #endif | |
4a438fc5 | 227 | static ulong data_st; /* start of data area written out */ |
4e3a36cd JB |
228 | |
229 | #ifndef MAX_SECTIONS | |
230 | #define MAX_SECTIONS 10 | |
231 | #endif | |
232 | ||
233 | #endif /* COFF */ | |
234 | ||
235 | static int pagemask; | |
236 | ||
237 | /* Correct an int which is the bit pattern of a pointer to a byte | |
238 | into an int which is the number of a byte. | |
239 | This is a no-op on ordinary machines, but not on all. */ | |
240 | ||
241 | #ifndef ADDR_CORRECT /* Let m-*.h files override this definition */ | |
242 | #define ADDR_CORRECT(x) ((char *)(x) - (char*)0) | |
243 | #endif | |
244 | ||
245 | #ifdef emacs | |
8eca17c9 | 246 | #include "lisp.h" |
4e3a36cd JB |
247 | |
248 | static | |
249 | report_error (file, fd) | |
250 | char *file; | |
251 | int fd; | |
252 | { | |
253 | if (fd) | |
254 | close (fd); | |
8eca17c9 | 255 | report_file_error ("Cannot unexec", Fcons (build_string (file), Qnil)); |
4e3a36cd JB |
256 | } |
257 | #endif /* emacs */ | |
76998edb | 258 | |
4e3a36cd JB |
259 | #define ERROR0(msg) report_error_1 (new, msg, 0, 0); return -1 |
260 | #define ERROR1(msg,x) report_error_1 (new, msg, x, 0); return -1 | |
261 | #define ERROR2(msg,x,y) report_error_1 (new, msg, x, y); return -1 | |
76998edb | 262 | |
4e3a36cd JB |
263 | static |
264 | report_error_1 (fd, msg, a1, a2) | |
265 | int fd; | |
266 | char *msg; | |
267 | int a1, a2; | |
76998edb | 268 | { |
4e3a36cd JB |
269 | close (fd); |
270 | #ifdef emacs | |
271 | error (msg, a1, a2); | |
272 | #else | |
273 | fprintf (stderr, msg, a1, a2); | |
274 | fprintf (stderr, "\n"); | |
275 | #endif | |
276 | } | |
277 | ||
278 | static int make_hdr (); | |
279 | static void mark_x (); | |
280 | static int copy_text_and_data (); | |
281 | static int copy_sym (); | |
282 | \f | |
283 | /* **************************************************************** | |
284 | * unexec | |
285 | * | |
286 | * driving logic. | |
287 | */ | |
288 | unexec (new_name, a_name, data_start, bss_start, entry_address) | |
289 | char *new_name, *a_name; | |
290 | unsigned data_start, bss_start, entry_address; | |
76998edb | 291 | { |
4e3a36cd JB |
292 | int new, a_out = -1; |
293 | ||
294 | if (a_name && (a_out = open (a_name, 0)) < 0) | |
295 | { | |
296 | PERROR (a_name); | |
297 | } | |
298 | if ((new = creat (new_name, 0666)) < 0) | |
299 | { | |
300 | PERROR (new_name); | |
301 | } | |
302 | if (make_hdr (new,a_out,data_start,bss_start,entry_address,a_name,new_name) < 0 | |
303 | || copy_text_and_data (new) < 0 | |
304 | || copy_sym (new, a_out, a_name, new_name) < 0 | |
305 | #ifdef COFF | |
306 | || adjust_lnnoptrs (new, a_out, new_name) < 0 | |
307 | #endif | |
308 | #ifdef XCOFF | |
309 | || unrelocate_symbols (new, a_out, a_name, new_name) < 0 | |
310 | #endif | |
311 | ) | |
76998edb | 312 | { |
4e3a36cd JB |
313 | close (new); |
314 | /* unlink (new_name); /* Failed, unlink new a.out */ | |
315 | return -1; | |
76998edb | 316 | } |
76998edb | 317 | |
4e3a36cd JB |
318 | close (new); |
319 | if (a_out >= 0) | |
320 | close (a_out); | |
321 | mark_x (new_name); | |
322 | return 0; | |
323 | } | |
324 | ||
325 | /* **************************************************************** | |
326 | * make_hdr | |
327 | * | |
328 | * Make the header in the new a.out from the header in core. | |
329 | * Modify the text and data sizes. | |
330 | */ | |
331 | static int | |
332 | make_hdr (new, a_out, data_start, bss_start, entry_address, a_name, new_name) | |
333 | int new, a_out; | |
334 | unsigned data_start, bss_start, entry_address; | |
335 | char *a_name; | |
336 | char *new_name; | |
337 | { | |
338 | register int scns; | |
339 | unsigned int bss_end; | |
340 | ||
341 | struct scnhdr section[MAX_SECTIONS]; | |
342 | struct scnhdr * f_thdr; /* Text section header */ | |
343 | struct scnhdr * f_dhdr; /* Data section header */ | |
344 | struct scnhdr * f_bhdr; /* Bss section header */ | |
345 | struct scnhdr * f_lhdr; /* Loader section header */ | |
346 | struct scnhdr * f_tchdr; /* Typechk section header */ | |
347 | struct scnhdr * f_dbhdr; /* Debug section header */ | |
348 | struct scnhdr * f_xhdr; /* Except section header */ | |
349 | ||
350 | load_scnptr = orig_load_scnptr = lnnoptr = 0; | |
351 | pagemask = getpagesize () - 1; | |
352 | ||
353 | /* Adjust text/data boundary. */ | |
354 | #ifdef NO_REMAP | |
355 | data_start = (long) start_of_data (); | |
356 | #endif /* NO_REMAP */ | |
357 | data_start = ADDR_CORRECT (data_start); | |
358 | ||
359 | #ifdef SEGMENT_MASK | |
360 | data_start = data_start & ~SEGMENT_MASK; /* (Down) to segment boundary. */ | |
361 | #else | |
362 | data_start = data_start & ~pagemask; /* (Down) to page boundary. */ | |
363 | #endif | |
364 | ||
365 | ||
366 | bss_end = ADDR_CORRECT (sbrk (0)) + pagemask; | |
367 | bss_end &= ~ pagemask; | |
368 | /* Adjust data/bss boundary. */ | |
369 | if (bss_start != 0) | |
76998edb | 370 | { |
4e3a36cd JB |
371 | bss_start = (ADDR_CORRECT (bss_start) + pagemask); |
372 | /* (Up) to page bdry. */ | |
373 | bss_start &= ~ pagemask; | |
374 | if (bss_start > bss_end) | |
76998edb | 375 | { |
4e3a36cd JB |
376 | ERROR1 ("unexec: Specified bss_start (%u) is past end of program", |
377 | bss_start); | |
76998edb | 378 | } |
76998edb | 379 | } |
4e3a36cd JB |
380 | else |
381 | bss_start = bss_end; | |
76998edb | 382 | |
4e3a36cd JB |
383 | if (data_start > bss_start) /* Can't have negative data size. */ |
384 | { | |
385 | ERROR2 ("unexec: data_start (%u) can't be greater than bss_start (%u)", | |
386 | data_start, bss_start); | |
387 | } | |
76998edb | 388 | |
4e3a36cd JB |
389 | #ifdef COFF |
390 | /* Salvage as much info from the existing file as possible */ | |
4e3a36cd JB |
391 | f_thdr = NULL; f_dhdr = NULL; f_bhdr = NULL; |
392 | f_lhdr = NULL; f_tchdr = NULL; f_dbhdr = NULL; f_xhdr = NULL; | |
393 | if (a_out >= 0) | |
76998edb | 394 | { |
4e3a36cd JB |
395 | if (read (a_out, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) |
396 | { | |
397 | PERROR (a_name); | |
398 | } | |
4e3a36cd JB |
399 | if (f_hdr.f_opthdr > 0) |
400 | { | |
401 | if (read (a_out, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) | |
402 | { | |
403 | PERROR (a_name); | |
404 | } | |
4e3a36cd JB |
405 | } |
406 | if (f_hdr.f_nscns > MAX_SECTIONS) | |
407 | { | |
408 | ERROR0 ("unexec: too many section headers -- increase MAX_SECTIONS"); | |
409 | } | |
410 | /* Loop through section headers */ | |
411 | for (scns = 0; scns < f_hdr.f_nscns; scns++) { | |
412 | struct scnhdr *s = §ion[scns]; | |
413 | if (read (a_out, s, sizeof (*s)) != sizeof (*s)) | |
414 | { | |
415 | PERROR (a_name); | |
416 | } | |
4e3a36cd JB |
417 | |
418 | #define CHECK_SCNHDR(ptr, name, flags) \ | |
419 | if (strcmp(s->s_name, name) == 0) { \ | |
420 | if (s->s_flags != flags) { \ | |
d63c1903 KH |
421 | fprintf(stderr, "unexec: %lx flags where %x expected in %s section.\n", \ |
422 | (unsigned long)s->s_flags, flags, name); \ | |
4e3a36cd JB |
423 | } \ |
424 | if (ptr) { \ | |
425 | fprintf(stderr, "unexec: duplicate section header for section %s.\n", \ | |
426 | name); \ | |
427 | } \ | |
428 | ptr = s; \ | |
429 | } | |
430 | CHECK_SCNHDR(f_thdr, _TEXT, STYP_TEXT); | |
431 | CHECK_SCNHDR(f_dhdr, _DATA, STYP_DATA); | |
432 | CHECK_SCNHDR(f_bhdr, _BSS, STYP_BSS); | |
433 | CHECK_SCNHDR(f_lhdr, _LOADER, STYP_LOADER); | |
434 | CHECK_SCNHDR(f_dbhdr, _DEBUG, STYP_DEBUG); | |
435 | CHECK_SCNHDR(f_tchdr, _TYPCHK, STYP_TYPCHK); | |
436 | CHECK_SCNHDR(f_xhdr, _EXCEPT, STYP_EXCEPT); | |
437 | } | |
438 | ||
439 | if (f_thdr == 0) | |
440 | { | |
441 | ERROR1 ("unexec: couldn't find \"%s\" section", _TEXT); | |
442 | } | |
443 | if (f_dhdr == 0) | |
444 | { | |
445 | ERROR1 ("unexec: couldn't find \"%s\" section", _DATA); | |
446 | } | |
447 | if (f_bhdr == 0) | |
448 | { | |
449 | ERROR1 ("unexec: couldn't find \"%s\" section", _BSS); | |
450 | } | |
76998edb | 451 | } |
4e3a36cd | 452 | else |
76998edb | 453 | { |
4e3a36cd | 454 | ERROR0 ("can't build a COFF file from scratch yet"); |
76998edb | 455 | } |
4e3a36cd JB |
456 | orig_data_scnptr = f_dhdr->s_scnptr; |
457 | orig_load_scnptr = f_lhdr ? f_lhdr->s_scnptr : 0; | |
458 | ||
459 | /* Now we alter the contents of all the f_*hdr variables | |
460 | to correspond to what we want to dump. */ | |
4a438fc5 RS |
461 | |
462 | /* Indicate that the reloc information is no longer valid for ld (bind); | |
463 | we only update it enough to fake out the exec-time loader. */ | |
464 | f_hdr.f_flags |= (F_RELFLG | F_EXEC); | |
465 | ||
4e3a36cd JB |
466 | #ifdef EXEC_MAGIC |
467 | f_ohdr.magic = EXEC_MAGIC; | |
468 | #endif | |
469 | #ifndef NO_REMAP | |
470 | f_ohdr.tsize = data_start - f_ohdr.text_start; | |
471 | f_ohdr.text_start = (long) start_of_text (); | |
472 | #endif | |
4a438fc5 RS |
473 | data_st = f_ohdr.data_start ? f_ohdr.data_start : (ulong) &_data; |
474 | f_ohdr.dsize = bss_start - data_st; | |
4e3a36cd JB |
475 | f_ohdr.bsize = bss_end - bss_start; |
476 | ||
477 | f_dhdr->s_size = f_ohdr.dsize; | |
478 | f_bhdr->s_size = f_ohdr.bsize; | |
4a438fc5 RS |
479 | f_bhdr->s_paddr = f_ohdr.data_start + f_ohdr.dsize; |
480 | f_bhdr->s_vaddr = f_ohdr.data_start + f_ohdr.dsize; | |
4e3a36cd JB |
481 | |
482 | /* fix scnptr's */ | |
483 | { | |
4a438fc5 | 484 | ulong ptr = section[0].s_scnptr; |
4e3a36cd | 485 | |
4a438fc5 RS |
486 | bias = -1; |
487 | for (scns = 0; scns < f_hdr.f_nscns; scns++) | |
488 | { | |
489 | struct scnhdr *s = §ion[scns]; | |
4e3a36cd | 490 | |
4a438fc5 RS |
491 | if (s->s_flags & STYP_PAD) /* .pad sections omitted in AIX 4.1 */ |
492 | { | |
493 | /* | |
494 | * the text_start should probably be o_algntext but that doesn't | |
495 | * seem to change | |
496 | */ | |
497 | if (f_ohdr.text_start != 0) /* && scns != 0 */ | |
498 | { | |
499 | s->s_size = 512 - (ptr % 512); | |
500 | if (s->s_size == 512) | |
501 | s->s_size = 0; | |
502 | } | |
503 | s->s_scnptr = ptr; | |
504 | } | |
505 | else if (s->s_flags & STYP_DATA) | |
4e3a36cd | 506 | s->s_scnptr = ptr; |
4a438fc5 RS |
507 | else if (!(s->s_flags & (STYP_TEXT | STYP_BSS))) |
508 | { | |
509 | if (bias == -1) /* if first section after bss */ | |
510 | bias = ptr - s->s_scnptr; | |
4e3a36cd | 511 | |
4a438fc5 RS |
512 | s->s_scnptr += bias; |
513 | ptr = s->s_scnptr; | |
514 | } | |
515 | ||
516 | ptr = ptr + s->s_size; | |
517 | } | |
4e3a36cd JB |
518 | } |
519 | ||
520 | /* fix other pointers */ | |
4a438fc5 RS |
521 | for (scns = 0; scns < f_hdr.f_nscns; scns++) |
522 | { | |
523 | struct scnhdr *s = §ion[scns]; | |
4e3a36cd | 524 | |
4a438fc5 RS |
525 | if (s->s_relptr != 0) |
526 | { | |
527 | s->s_relptr += bias; | |
528 | } | |
529 | if (s->s_lnnoptr != 0) | |
530 | { | |
531 | if (lnnoptr == 0) lnnoptr = s->s_lnnoptr; | |
532 | s->s_lnnoptr += bias; | |
533 | } | |
534 | } | |
4e3a36cd JB |
535 | |
536 | if (f_hdr.f_symptr > 0L) | |
76998edb | 537 | { |
4e3a36cd | 538 | f_hdr.f_symptr += bias; |
76998edb JB |
539 | } |
540 | ||
4e3a36cd JB |
541 | text_scnptr = f_thdr->s_scnptr; |
542 | data_scnptr = f_dhdr->s_scnptr; | |
543 | load_scnptr = f_lhdr ? f_lhdr->s_scnptr : 0; | |
76998edb | 544 | |
4e3a36cd JB |
545 | #ifdef ADJUST_EXEC_HEADER |
546 | ADJUST_EXEC_HEADER | |
547 | #endif /* ADJUST_EXEC_HEADER */ | |
76998edb | 548 | |
4e3a36cd JB |
549 | if (write (new, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) |
550 | { | |
551 | PERROR (new_name); | |
552 | } | |
76998edb | 553 | |
4e3a36cd JB |
554 | if (f_hdr.f_opthdr > 0) |
555 | { | |
556 | if (write (new, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) | |
76998edb | 557 | { |
4e3a36cd JB |
558 | PERROR (new_name); |
559 | } | |
560 | } | |
76998edb | 561 | |
4e3a36cd JB |
562 | for (scns = 0; scns < f_hdr.f_nscns; scns++) { |
563 | struct scnhdr *s = §ion[scns]; | |
564 | if (write (new, s, sizeof (*s)) != sizeof (*s)) | |
565 | { | |
566 | PERROR (new_name); | |
567 | } | |
568 | } | |
76998edb | 569 | |
4e3a36cd JB |
570 | return (0); |
571 | ||
572 | #endif /* COFF */ | |
573 | } | |
574 | \f | |
575 | /* **************************************************************** | |
576 | ||
577 | * | |
578 | * Copy the text and data segments from memory to the new a.out | |
579 | */ | |
580 | static int | |
581 | copy_text_and_data (new) | |
582 | int new; | |
583 | { | |
584 | register char *end; | |
585 | register char *ptr; | |
586 | ||
587 | lseek (new, (long) text_scnptr, 0); | |
588 | ptr = start_of_text () + text_scnptr; | |
589 | end = ptr + f_ohdr.tsize; | |
590 | write_segment (new, ptr, end); | |
591 | ||
592 | lseek (new, (long) data_scnptr, 0); | |
4a438fc5 | 593 | ptr = (char *) data_st; |
4e3a36cd JB |
594 | end = ptr + f_ohdr.dsize; |
595 | write_segment (new, ptr, end); | |
596 | ||
597 | return 0; | |
598 | } | |
599 | ||
91b97ddb | 600 | #define UnexBlockSz (1<<12) /* read/write block size */ |
4e3a36cd JB |
601 | write_segment (new, ptr, end) |
602 | int new; | |
603 | register char *ptr, *end; | |
604 | { | |
605 | register int i, nwrite, ret; | |
606 | char buf[80]; | |
607 | extern int errno; | |
91b97ddb | 608 | char zeros[UnexBlockSz]; |
4e3a36cd JB |
609 | |
610 | for (i = 0; ptr < end;) | |
611 | { | |
91b97ddb RS |
612 | /* distance to next block. */ |
613 | nwrite = (((int) ptr + UnexBlockSz) & -UnexBlockSz) - (int) ptr; | |
4e3a36cd JB |
614 | /* But not beyond specified end. */ |
615 | if (nwrite > end - ptr) nwrite = end - ptr; | |
616 | ret = write (new, ptr, nwrite); | |
617 | /* If write gets a page fault, it means we reached | |
618 | a gap between the old text segment and the old data segment. | |
619 | This gap has probably been remapped into part of the text segment. | |
620 | So write zeros for it. */ | |
621 | if (ret == -1 && errno == EFAULT) | |
76998edb | 622 | { |
91b97ddb RS |
623 | bzero (zeros, nwrite); |
624 | write (new, zeros, nwrite); | |
76998edb | 625 | } |
4e3a36cd | 626 | else if (nwrite != ret) |
76998edb | 627 | { |
4e3a36cd | 628 | sprintf (buf, |
d63c1903 KH |
629 | "unexec write failure: addr 0x%lx, fileno %d, size 0x%x, wrote 0x%x, errno %d", |
630 | (unsigned long)ptr, new, nwrite, ret, errno); | |
4e3a36cd | 631 | PERROR (buf); |
76998edb | 632 | } |
4e3a36cd JB |
633 | i += nwrite; |
634 | ptr += nwrite; | |
635 | } | |
636 | } | |
637 | \f | |
638 | /* **************************************************************** | |
639 | * copy_sym | |
640 | * | |
641 | * Copy the relocation information and symbol table from the a.out to the new | |
642 | */ | |
643 | static int | |
644 | copy_sym (new, a_out, a_name, new_name) | |
645 | int new, a_out; | |
646 | char *a_name, *new_name; | |
647 | { | |
91b97ddb | 648 | char page[UnexBlockSz]; |
4e3a36cd | 649 | int n; |
76998edb | 650 | |
4e3a36cd JB |
651 | if (a_out < 0) |
652 | return 0; | |
76998edb | 653 | |
4a438fc5 | 654 | if (orig_load_scnptr == 0L) |
4e3a36cd | 655 | return 0; |
76998edb | 656 | |
4a438fc5 RS |
657 | if (lnnoptr && lnnoptr < orig_load_scnptr) /* if there is line number info */ |
658 | lseek (a_out, lnnoptr, 0); /* start copying from there */ | |
4e3a36cd | 659 | else |
4a438fc5 | 660 | lseek (a_out, orig_load_scnptr, 0); /* Position a.out to symtab. */ |
4e3a36cd JB |
661 | |
662 | while ((n = read (a_out, page, sizeof page)) > 0) | |
663 | { | |
664 | if (write (new, page, n) != n) | |
76998edb | 665 | { |
4e3a36cd | 666 | PERROR (new_name); |
76998edb JB |
667 | } |
668 | } | |
4e3a36cd JB |
669 | if (n < 0) |
670 | { | |
671 | PERROR (a_name); | |
672 | } | |
673 | return 0; | |
674 | } | |
675 | \f | |
676 | /* **************************************************************** | |
677 | * mark_x | |
678 | * | |
eb8c3be9 | 679 | * After successfully building the new a.out, mark it executable |
4e3a36cd JB |
680 | */ |
681 | static void | |
682 | mark_x (name) | |
683 | char *name; | |
684 | { | |
685 | struct stat sbuf; | |
686 | int um; | |
687 | int new = 0; /* for PERROR */ | |
76998edb | 688 | |
4e3a36cd JB |
689 | um = umask (777); |
690 | umask (um); | |
691 | if (stat (name, &sbuf) == -1) | |
692 | { | |
693 | PERROR (name); | |
694 | } | |
695 | sbuf.st_mode |= 0111 & ~um; | |
696 | if (chmod (name, sbuf.st_mode) == -1) | |
697 | PERROR (name); | |
698 | } | |
699 | \f | |
700 | /* | |
701 | * If the COFF file contains a symbol table and a line number section, | |
702 | * then any auxiliary entries that have values for x_lnnoptr must | |
703 | * be adjusted by the amount that the line number section has moved | |
704 | * in the file (bias computed in make_hdr). The #@$%&* designers of | |
705 | * the auxiliary entry structures used the absolute file offsets for | |
706 | * the line number entry rather than an offset from the start of the | |
707 | * line number section! | |
708 | * | |
709 | * When I figure out how to scan through the symbol table and pick out | |
710 | * the auxiliary entries that need adjustment, this routine will | |
711 | * be fixed. As it is now, all such entries are wrong and sdb | |
712 | * will complain. Fred Fish, UniSoft Systems Inc. | |
4a438fc5 RS |
713 | * |
714 | * I believe this is now fixed correctly. Bill Mann | |
4e3a36cd JB |
715 | */ |
716 | ||
717 | #ifdef COFF | |
718 | ||
719 | /* This function is probably very slow. Instead of reopening the new | |
720 | file for input and output it should copy from the old to the new | |
721 | using the two descriptors already open (WRITEDESC and READDESC). | |
722 | Instead of reading one small structure at a time it should use | |
723 | a reasonable size buffer. But I don't have time to work on such | |
724 | things, so I am installing it as submitted to me. -- RMS. */ | |
725 | ||
726 | adjust_lnnoptrs (writedesc, readdesc, new_name) | |
727 | int writedesc; | |
728 | int readdesc; | |
729 | char *new_name; | |
730 | { | |
731 | register int nsyms; | |
0817a05a | 732 | register int naux; |
4e3a36cd JB |
733 | register int new; |
734 | #ifdef amdahl_uts | |
735 | SYMENT symentry; | |
736 | AUXENT auxentry; | |
737 | #else | |
738 | struct syment symentry; | |
739 | union auxent auxentry; | |
740 | #endif | |
741 | ||
742 | if (!lnnoptr || !f_hdr.f_symptr) | |
743 | return 0; | |
744 | ||
745 | if ((new = open (new_name, 2)) < 0) | |
746 | { | |
747 | PERROR (new_name); | |
748 | return -1; | |
749 | } | |
750 | ||
751 | lseek (new, f_hdr.f_symptr, 0); | |
752 | for (nsyms = 0; nsyms < f_hdr.f_nsyms; nsyms++) | |
753 | { | |
754 | read (new, &symentry, SYMESZ); | |
91b97ddb RS |
755 | if (symentry.n_sclass == C_BINCL || symentry.n_sclass == C_EINCL) |
756 | { | |
757 | symentry.n_value += bias; | |
758 | lseek (new, -SYMESZ, 1); | |
759 | write (new, &symentry, SYMESZ); | |
760 | } | |
761 | ||
4a438fc5 | 762 | for (naux = symentry.n_numaux; naux-- != 0; ) |
4e3a36cd JB |
763 | { |
764 | read (new, &auxentry, AUXESZ); | |
765 | nsyms++; | |
4a438fc5 RS |
766 | if (naux != 0 /* skip csect auxentry (last entry) */ |
767 | && (symentry.n_sclass == C_EXT || symentry.n_sclass == C_HIDEXT)) | |
768 | { | |
769 | auxentry.x_sym.x_fcnary.x_fcn.x_lnnoptr += bias; | |
770 | lseek (new, -AUXESZ, 1); | |
771 | write (new, &auxentry, AUXESZ); | |
772 | } | |
4e3a36cd JB |
773 | } |
774 | } | |
775 | close (new); | |
76998edb JB |
776 | } |
777 | ||
4e3a36cd | 778 | #endif /* COFF */ |
76998edb | 779 | |
4e3a36cd JB |
780 | #ifdef XCOFF |
781 | ||
782 | /* It is probably a false economy to optimise this routine (it used to | |
783 | read one LDREL and do do two lseeks per iteration) but the wrath of | |
784 | RMS (see above :-) would be too much to bear */ | |
785 | ||
786 | unrelocate_symbols (new, a_out, a_name, new_name) | |
787 | int new, a_out; | |
788 | char *a_name, *new_name; | |
76998edb | 789 | { |
4e3a36cd JB |
790 | register int i; |
791 | register int l; | |
792 | register LDREL *ldrel; | |
793 | LDHDR ldhdr; | |
794 | LDREL ldrel_buf [20]; | |
4a438fc5 RS |
795 | ulong t_reloc = (ulong) &_text - f_ohdr.text_start; |
796 | ulong d_reloc = (ulong) &_data - ALIGN(f_ohdr.data_start, 2); | |
4e3a36cd | 797 | int * p; |
4e3a36cd JB |
798 | |
799 | if (load_scnptr == 0) | |
800 | return 0; | |
801 | ||
802 | lseek (a_out, orig_load_scnptr, 0); | |
803 | if (read (a_out, &ldhdr, sizeof (ldhdr)) != sizeof (ldhdr)) | |
804 | { | |
805 | PERROR (new_name); | |
806 | } | |
807 | ||
808 | #define SYMNDX_TEXT 0 | |
809 | #define SYMNDX_DATA 1 | |
810 | #define SYMNDX_BSS 2 | |
811 | l = 0; | |
812 | for (i = 0; i < ldhdr.l_nreloc; i++, l--, ldrel++) | |
813 | { | |
814 | if (l == 0) { | |
815 | lseek (a_out, | |
816 | orig_load_scnptr + LDHDRSZ + LDSYMSZ*ldhdr.l_nsyms + LDRELSZ*i, | |
817 | 0); | |
818 | ||
819 | l = ldhdr.l_nreloc - i; | |
820 | if (l > sizeof (ldrel_buf) / LDRELSZ) | |
821 | l = sizeof (ldrel_buf) / LDRELSZ; | |
822 | ||
823 | if (read (a_out, ldrel_buf, l * LDRELSZ) != l * LDRELSZ) | |
824 | { | |
825 | PERROR (a_name); | |
826 | } | |
827 | ldrel = ldrel_buf; | |
828 | } | |
4e3a36cd JB |
829 | |
830 | /* move the BSS loader symbols to the DATA segment */ | |
4e3a36cd | 831 | if (ldrel->l_symndx == SYMNDX_BSS) |
4e3a36cd | 832 | { |
91b97ddb RS |
833 | ldrel->l_symndx = SYMNDX_DATA; |
834 | ||
4e3a36cd JB |
835 | lseek (new, |
836 | load_scnptr + LDHDRSZ + LDSYMSZ*ldhdr.l_nsyms + LDRELSZ*i, | |
837 | 0); | |
838 | ||
839 | if (write (new, ldrel, LDRELSZ) != LDRELSZ) | |
840 | { | |
841 | PERROR (new_name); | |
842 | } | |
843 | } | |
844 | ||
845 | if (ldrel->l_rsecnm == f_ohdr.o_sndata) | |
846 | { | |
847 | int orig_int; | |
848 | ||
4a438fc5 RS |
849 | lseek (a_out, |
850 | orig_data_scnptr + (ldrel->l_vaddr - f_ohdr.data_start), 0); | |
4e3a36cd JB |
851 | |
852 | if (read (a_out, (void *) &orig_int, sizeof (orig_int)) != sizeof (orig_int)) | |
853 | { | |
854 | PERROR (a_name); | |
855 | } | |
856 | ||
4a438fc5 RS |
857 | p = (int *) (ldrel->l_vaddr + d_reloc); |
858 | ||
4e3a36cd JB |
859 | switch (ldrel->l_symndx) { |
860 | case SYMNDX_TEXT: | |
4a438fc5 | 861 | orig_int = * p - t_reloc; |
4e3a36cd JB |
862 | break; |
863 | ||
864 | case SYMNDX_DATA: | |
865 | case SYMNDX_BSS: | |
4a438fc5 | 866 | orig_int = * p - d_reloc; |
4e3a36cd JB |
867 | break; |
868 | } | |
869 | ||
4a438fc5 RS |
870 | if (orig_int != * p) |
871 | { | |
872 | lseek (new, | |
873 | data_scnptr + (ldrel->l_vaddr - f_ohdr.data_start), 0); | |
874 | if (write (new, (void *) &orig_int, sizeof (orig_int)) | |
875 | != sizeof (orig_int)) | |
876 | { | |
877 | PERROR (new_name); | |
878 | } | |
879 | } | |
4e3a36cd JB |
880 | } |
881 | } | |
76998edb | 882 | } |
4e3a36cd | 883 | #endif /* XCOFF */ |