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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 | 313 | close (new); |
4e3a36cd | 314 | return -1; |
76998edb | 315 | } |
76998edb | 316 | |
4e3a36cd JB |
317 | close (new); |
318 | if (a_out >= 0) | |
319 | close (a_out); | |
320 | mark_x (new_name); | |
321 | return 0; | |
322 | } | |
323 | ||
324 | /* **************************************************************** | |
325 | * make_hdr | |
326 | * | |
327 | * Make the header in the new a.out from the header in core. | |
328 | * Modify the text and data sizes. | |
329 | */ | |
330 | static int | |
331 | make_hdr (new, a_out, data_start, bss_start, entry_address, a_name, new_name) | |
332 | int new, a_out; | |
333 | unsigned data_start, bss_start, entry_address; | |
334 | char *a_name; | |
335 | char *new_name; | |
336 | { | |
337 | register int scns; | |
338 | unsigned int bss_end; | |
339 | ||
340 | struct scnhdr section[MAX_SECTIONS]; | |
341 | struct scnhdr * f_thdr; /* Text section header */ | |
342 | struct scnhdr * f_dhdr; /* Data section header */ | |
343 | struct scnhdr * f_bhdr; /* Bss section header */ | |
344 | struct scnhdr * f_lhdr; /* Loader section header */ | |
345 | struct scnhdr * f_tchdr; /* Typechk section header */ | |
346 | struct scnhdr * f_dbhdr; /* Debug section header */ | |
347 | struct scnhdr * f_xhdr; /* Except section header */ | |
348 | ||
349 | load_scnptr = orig_load_scnptr = lnnoptr = 0; | |
350 | pagemask = getpagesize () - 1; | |
351 | ||
352 | /* Adjust text/data boundary. */ | |
353 | #ifdef NO_REMAP | |
354 | data_start = (long) start_of_data (); | |
355 | #endif /* NO_REMAP */ | |
356 | data_start = ADDR_CORRECT (data_start); | |
357 | ||
358 | #ifdef SEGMENT_MASK | |
359 | data_start = data_start & ~SEGMENT_MASK; /* (Down) to segment boundary. */ | |
360 | #else | |
361 | data_start = data_start & ~pagemask; /* (Down) to page boundary. */ | |
362 | #endif | |
363 | ||
364 | ||
365 | bss_end = ADDR_CORRECT (sbrk (0)) + pagemask; | |
366 | bss_end &= ~ pagemask; | |
367 | /* Adjust data/bss boundary. */ | |
368 | if (bss_start != 0) | |
76998edb | 369 | { |
4e3a36cd JB |
370 | bss_start = (ADDR_CORRECT (bss_start) + pagemask); |
371 | /* (Up) to page bdry. */ | |
372 | bss_start &= ~ pagemask; | |
373 | if (bss_start > bss_end) | |
76998edb | 374 | { |
4e3a36cd JB |
375 | ERROR1 ("unexec: Specified bss_start (%u) is past end of program", |
376 | bss_start); | |
76998edb | 377 | } |
76998edb | 378 | } |
4e3a36cd JB |
379 | else |
380 | bss_start = bss_end; | |
76998edb | 381 | |
4e3a36cd JB |
382 | if (data_start > bss_start) /* Can't have negative data size. */ |
383 | { | |
384 | ERROR2 ("unexec: data_start (%u) can't be greater than bss_start (%u)", | |
385 | data_start, bss_start); | |
386 | } | |
76998edb | 387 | |
4e3a36cd JB |
388 | #ifdef COFF |
389 | /* Salvage as much info from the existing file as possible */ | |
4e3a36cd JB |
390 | f_thdr = NULL; f_dhdr = NULL; f_bhdr = NULL; |
391 | f_lhdr = NULL; f_tchdr = NULL; f_dbhdr = NULL; f_xhdr = NULL; | |
392 | if (a_out >= 0) | |
76998edb | 393 | { |
4e3a36cd JB |
394 | if (read (a_out, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) |
395 | { | |
396 | PERROR (a_name); | |
397 | } | |
4e3a36cd JB |
398 | if (f_hdr.f_opthdr > 0) |
399 | { | |
400 | if (read (a_out, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) | |
401 | { | |
402 | PERROR (a_name); | |
403 | } | |
4e3a36cd JB |
404 | } |
405 | if (f_hdr.f_nscns > MAX_SECTIONS) | |
406 | { | |
407 | ERROR0 ("unexec: too many section headers -- increase MAX_SECTIONS"); | |
408 | } | |
409 | /* Loop through section headers */ | |
410 | for (scns = 0; scns < f_hdr.f_nscns; scns++) { | |
411 | struct scnhdr *s = §ion[scns]; | |
412 | if (read (a_out, s, sizeof (*s)) != sizeof (*s)) | |
413 | { | |
414 | PERROR (a_name); | |
415 | } | |
4e3a36cd JB |
416 | |
417 | #define CHECK_SCNHDR(ptr, name, flags) \ | |
418 | if (strcmp(s->s_name, name) == 0) { \ | |
419 | if (s->s_flags != flags) { \ | |
d63c1903 KH |
420 | fprintf(stderr, "unexec: %lx flags where %x expected in %s section.\n", \ |
421 | (unsigned long)s->s_flags, flags, name); \ | |
4e3a36cd JB |
422 | } \ |
423 | if (ptr) { \ | |
424 | fprintf(stderr, "unexec: duplicate section header for section %s.\n", \ | |
425 | name); \ | |
426 | } \ | |
427 | ptr = s; \ | |
428 | } | |
429 | CHECK_SCNHDR(f_thdr, _TEXT, STYP_TEXT); | |
430 | CHECK_SCNHDR(f_dhdr, _DATA, STYP_DATA); | |
431 | CHECK_SCNHDR(f_bhdr, _BSS, STYP_BSS); | |
432 | CHECK_SCNHDR(f_lhdr, _LOADER, STYP_LOADER); | |
433 | CHECK_SCNHDR(f_dbhdr, _DEBUG, STYP_DEBUG); | |
434 | CHECK_SCNHDR(f_tchdr, _TYPCHK, STYP_TYPCHK); | |
435 | CHECK_SCNHDR(f_xhdr, _EXCEPT, STYP_EXCEPT); | |
436 | } | |
437 | ||
438 | if (f_thdr == 0) | |
439 | { | |
440 | ERROR1 ("unexec: couldn't find \"%s\" section", _TEXT); | |
441 | } | |
442 | if (f_dhdr == 0) | |
443 | { | |
444 | ERROR1 ("unexec: couldn't find \"%s\" section", _DATA); | |
445 | } | |
446 | if (f_bhdr == 0) | |
447 | { | |
448 | ERROR1 ("unexec: couldn't find \"%s\" section", _BSS); | |
449 | } | |
76998edb | 450 | } |
4e3a36cd | 451 | else |
76998edb | 452 | { |
4e3a36cd | 453 | ERROR0 ("can't build a COFF file from scratch yet"); |
76998edb | 454 | } |
4e3a36cd JB |
455 | orig_data_scnptr = f_dhdr->s_scnptr; |
456 | orig_load_scnptr = f_lhdr ? f_lhdr->s_scnptr : 0; | |
457 | ||
458 | /* Now we alter the contents of all the f_*hdr variables | |
459 | to correspond to what we want to dump. */ | |
4a438fc5 RS |
460 | |
461 | /* Indicate that the reloc information is no longer valid for ld (bind); | |
462 | we only update it enough to fake out the exec-time loader. */ | |
463 | f_hdr.f_flags |= (F_RELFLG | F_EXEC); | |
464 | ||
4e3a36cd JB |
465 | #ifdef EXEC_MAGIC |
466 | f_ohdr.magic = EXEC_MAGIC; | |
467 | #endif | |
468 | #ifndef NO_REMAP | |
469 | f_ohdr.tsize = data_start - f_ohdr.text_start; | |
470 | f_ohdr.text_start = (long) start_of_text (); | |
471 | #endif | |
4a438fc5 RS |
472 | data_st = f_ohdr.data_start ? f_ohdr.data_start : (ulong) &_data; |
473 | f_ohdr.dsize = bss_start - data_st; | |
4e3a36cd JB |
474 | f_ohdr.bsize = bss_end - bss_start; |
475 | ||
476 | f_dhdr->s_size = f_ohdr.dsize; | |
477 | f_bhdr->s_size = f_ohdr.bsize; | |
4a438fc5 RS |
478 | f_bhdr->s_paddr = f_ohdr.data_start + f_ohdr.dsize; |
479 | f_bhdr->s_vaddr = f_ohdr.data_start + f_ohdr.dsize; | |
4e3a36cd JB |
480 | |
481 | /* fix scnptr's */ | |
482 | { | |
4a438fc5 | 483 | ulong ptr = section[0].s_scnptr; |
4e3a36cd | 484 | |
4a438fc5 RS |
485 | bias = -1; |
486 | for (scns = 0; scns < f_hdr.f_nscns; scns++) | |
487 | { | |
488 | struct scnhdr *s = §ion[scns]; | |
4e3a36cd | 489 | |
4a438fc5 RS |
490 | if (s->s_flags & STYP_PAD) /* .pad sections omitted in AIX 4.1 */ |
491 | { | |
492 | /* | |
493 | * the text_start should probably be o_algntext but that doesn't | |
494 | * seem to change | |
495 | */ | |
496 | if (f_ohdr.text_start != 0) /* && scns != 0 */ | |
497 | { | |
498 | s->s_size = 512 - (ptr % 512); | |
499 | if (s->s_size == 512) | |
500 | s->s_size = 0; | |
501 | } | |
502 | s->s_scnptr = ptr; | |
503 | } | |
504 | else if (s->s_flags & STYP_DATA) | |
4e3a36cd | 505 | s->s_scnptr = ptr; |
4a438fc5 RS |
506 | else if (!(s->s_flags & (STYP_TEXT | STYP_BSS))) |
507 | { | |
508 | if (bias == -1) /* if first section after bss */ | |
509 | bias = ptr - s->s_scnptr; | |
4e3a36cd | 510 | |
4a438fc5 RS |
511 | s->s_scnptr += bias; |
512 | ptr = s->s_scnptr; | |
513 | } | |
514 | ||
515 | ptr = ptr + s->s_size; | |
516 | } | |
4e3a36cd JB |
517 | } |
518 | ||
519 | /* fix other pointers */ | |
4a438fc5 RS |
520 | for (scns = 0; scns < f_hdr.f_nscns; scns++) |
521 | { | |
522 | struct scnhdr *s = §ion[scns]; | |
4e3a36cd | 523 | |
4a438fc5 RS |
524 | if (s->s_relptr != 0) |
525 | { | |
526 | s->s_relptr += bias; | |
527 | } | |
528 | if (s->s_lnnoptr != 0) | |
529 | { | |
530 | if (lnnoptr == 0) lnnoptr = s->s_lnnoptr; | |
531 | s->s_lnnoptr += bias; | |
532 | } | |
533 | } | |
4e3a36cd JB |
534 | |
535 | if (f_hdr.f_symptr > 0L) | |
76998edb | 536 | { |
4e3a36cd | 537 | f_hdr.f_symptr += bias; |
76998edb JB |
538 | } |
539 | ||
4e3a36cd JB |
540 | text_scnptr = f_thdr->s_scnptr; |
541 | data_scnptr = f_dhdr->s_scnptr; | |
542 | load_scnptr = f_lhdr ? f_lhdr->s_scnptr : 0; | |
76998edb | 543 | |
4e3a36cd JB |
544 | #ifdef ADJUST_EXEC_HEADER |
545 | ADJUST_EXEC_HEADER | |
546 | #endif /* ADJUST_EXEC_HEADER */ | |
76998edb | 547 | |
4e3a36cd JB |
548 | if (write (new, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) |
549 | { | |
550 | PERROR (new_name); | |
551 | } | |
76998edb | 552 | |
4e3a36cd JB |
553 | if (f_hdr.f_opthdr > 0) |
554 | { | |
555 | if (write (new, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) | |
76998edb | 556 | { |
4e3a36cd JB |
557 | PERROR (new_name); |
558 | } | |
559 | } | |
76998edb | 560 | |
4e3a36cd JB |
561 | for (scns = 0; scns < f_hdr.f_nscns; scns++) { |
562 | struct scnhdr *s = §ion[scns]; | |
563 | if (write (new, s, sizeof (*s)) != sizeof (*s)) | |
564 | { | |
565 | PERROR (new_name); | |
566 | } | |
567 | } | |
76998edb | 568 | |
4e3a36cd JB |
569 | return (0); |
570 | ||
571 | #endif /* COFF */ | |
572 | } | |
573 | \f | |
574 | /* **************************************************************** | |
575 | ||
576 | * | |
577 | * Copy the text and data segments from memory to the new a.out | |
578 | */ | |
579 | static int | |
580 | copy_text_and_data (new) | |
581 | int new; | |
582 | { | |
583 | register char *end; | |
584 | register char *ptr; | |
585 | ||
586 | lseek (new, (long) text_scnptr, 0); | |
587 | ptr = start_of_text () + text_scnptr; | |
588 | end = ptr + f_ohdr.tsize; | |
589 | write_segment (new, ptr, end); | |
590 | ||
591 | lseek (new, (long) data_scnptr, 0); | |
4a438fc5 | 592 | ptr = (char *) data_st; |
4e3a36cd JB |
593 | end = ptr + f_ohdr.dsize; |
594 | write_segment (new, ptr, end); | |
595 | ||
596 | return 0; | |
597 | } | |
598 | ||
91b97ddb | 599 | #define UnexBlockSz (1<<12) /* read/write block size */ |
4e3a36cd JB |
600 | write_segment (new, ptr, end) |
601 | int new; | |
602 | register char *ptr, *end; | |
603 | { | |
604 | register int i, nwrite, ret; | |
605 | char buf[80]; | |
606 | extern int errno; | |
91b97ddb | 607 | char zeros[UnexBlockSz]; |
4e3a36cd JB |
608 | |
609 | for (i = 0; ptr < end;) | |
610 | { | |
91b97ddb RS |
611 | /* distance to next block. */ |
612 | nwrite = (((int) ptr + UnexBlockSz) & -UnexBlockSz) - (int) ptr; | |
4e3a36cd JB |
613 | /* But not beyond specified end. */ |
614 | if (nwrite > end - ptr) nwrite = end - ptr; | |
615 | ret = write (new, ptr, nwrite); | |
616 | /* If write gets a page fault, it means we reached | |
617 | a gap between the old text segment and the old data segment. | |
618 | This gap has probably been remapped into part of the text segment. | |
619 | So write zeros for it. */ | |
620 | if (ret == -1 && errno == EFAULT) | |
76998edb | 621 | { |
91b97ddb RS |
622 | bzero (zeros, nwrite); |
623 | write (new, zeros, nwrite); | |
76998edb | 624 | } |
4e3a36cd | 625 | else if (nwrite != ret) |
76998edb | 626 | { |
4e3a36cd | 627 | sprintf (buf, |
d63c1903 KH |
628 | "unexec write failure: addr 0x%lx, fileno %d, size 0x%x, wrote 0x%x, errno %d", |
629 | (unsigned long)ptr, new, nwrite, ret, errno); | |
4e3a36cd | 630 | PERROR (buf); |
76998edb | 631 | } |
4e3a36cd JB |
632 | i += nwrite; |
633 | ptr += nwrite; | |
634 | } | |
635 | } | |
636 | \f | |
637 | /* **************************************************************** | |
638 | * copy_sym | |
639 | * | |
640 | * Copy the relocation information and symbol table from the a.out to the new | |
641 | */ | |
642 | static int | |
643 | copy_sym (new, a_out, a_name, new_name) | |
644 | int new, a_out; | |
645 | char *a_name, *new_name; | |
646 | { | |
91b97ddb | 647 | char page[UnexBlockSz]; |
4e3a36cd | 648 | int n; |
76998edb | 649 | |
4e3a36cd JB |
650 | if (a_out < 0) |
651 | return 0; | |
76998edb | 652 | |
4a438fc5 | 653 | if (orig_load_scnptr == 0L) |
4e3a36cd | 654 | return 0; |
76998edb | 655 | |
4a438fc5 RS |
656 | if (lnnoptr && lnnoptr < orig_load_scnptr) /* if there is line number info */ |
657 | lseek (a_out, lnnoptr, 0); /* start copying from there */ | |
4e3a36cd | 658 | else |
4a438fc5 | 659 | lseek (a_out, orig_load_scnptr, 0); /* Position a.out to symtab. */ |
4e3a36cd JB |
660 | |
661 | while ((n = read (a_out, page, sizeof page)) > 0) | |
662 | { | |
663 | if (write (new, page, n) != n) | |
76998edb | 664 | { |
4e3a36cd | 665 | PERROR (new_name); |
76998edb JB |
666 | } |
667 | } | |
4e3a36cd JB |
668 | if (n < 0) |
669 | { | |
670 | PERROR (a_name); | |
671 | } | |
672 | return 0; | |
673 | } | |
674 | \f | |
675 | /* **************************************************************** | |
676 | * mark_x | |
677 | * | |
eb8c3be9 | 678 | * After successfully building the new a.out, mark it executable |
4e3a36cd JB |
679 | */ |
680 | static void | |
681 | mark_x (name) | |
682 | char *name; | |
683 | { | |
684 | struct stat sbuf; | |
685 | int um; | |
686 | int new = 0; /* for PERROR */ | |
76998edb | 687 | |
4e3a36cd JB |
688 | um = umask (777); |
689 | umask (um); | |
690 | if (stat (name, &sbuf) == -1) | |
691 | { | |
692 | PERROR (name); | |
693 | } | |
694 | sbuf.st_mode |= 0111 & ~um; | |
695 | if (chmod (name, sbuf.st_mode) == -1) | |
696 | PERROR (name); | |
697 | } | |
698 | \f | |
699 | /* | |
700 | * If the COFF file contains a symbol table and a line number section, | |
701 | * then any auxiliary entries that have values for x_lnnoptr must | |
702 | * be adjusted by the amount that the line number section has moved | |
703 | * in the file (bias computed in make_hdr). The #@$%&* designers of | |
704 | * the auxiliary entry structures used the absolute file offsets for | |
705 | * the line number entry rather than an offset from the start of the | |
706 | * line number section! | |
707 | * | |
708 | * When I figure out how to scan through the symbol table and pick out | |
709 | * the auxiliary entries that need adjustment, this routine will | |
710 | * be fixed. As it is now, all such entries are wrong and sdb | |
711 | * will complain. Fred Fish, UniSoft Systems Inc. | |
4a438fc5 RS |
712 | * |
713 | * I believe this is now fixed correctly. Bill Mann | |
4e3a36cd JB |
714 | */ |
715 | ||
716 | #ifdef COFF | |
717 | ||
718 | /* This function is probably very slow. Instead of reopening the new | |
719 | file for input and output it should copy from the old to the new | |
720 | using the two descriptors already open (WRITEDESC and READDESC). | |
721 | Instead of reading one small structure at a time it should use | |
722 | a reasonable size buffer. But I don't have time to work on such | |
723 | things, so I am installing it as submitted to me. -- RMS. */ | |
724 | ||
725 | adjust_lnnoptrs (writedesc, readdesc, new_name) | |
726 | int writedesc; | |
727 | int readdesc; | |
728 | char *new_name; | |
729 | { | |
730 | register int nsyms; | |
0817a05a | 731 | register int naux; |
4e3a36cd JB |
732 | register int new; |
733 | #ifdef amdahl_uts | |
734 | SYMENT symentry; | |
735 | AUXENT auxentry; | |
736 | #else | |
737 | struct syment symentry; | |
738 | union auxent auxentry; | |
739 | #endif | |
740 | ||
741 | if (!lnnoptr || !f_hdr.f_symptr) | |
742 | return 0; | |
743 | ||
744 | if ((new = open (new_name, 2)) < 0) | |
745 | { | |
746 | PERROR (new_name); | |
747 | return -1; | |
748 | } | |
749 | ||
750 | lseek (new, f_hdr.f_symptr, 0); | |
751 | for (nsyms = 0; nsyms < f_hdr.f_nsyms; nsyms++) | |
752 | { | |
753 | read (new, &symentry, SYMESZ); | |
91b97ddb RS |
754 | if (symentry.n_sclass == C_BINCL || symentry.n_sclass == C_EINCL) |
755 | { | |
756 | symentry.n_value += bias; | |
757 | lseek (new, -SYMESZ, 1); | |
758 | write (new, &symentry, SYMESZ); | |
759 | } | |
760 | ||
4a438fc5 | 761 | for (naux = symentry.n_numaux; naux-- != 0; ) |
4e3a36cd JB |
762 | { |
763 | read (new, &auxentry, AUXESZ); | |
764 | nsyms++; | |
4a438fc5 RS |
765 | if (naux != 0 /* skip csect auxentry (last entry) */ |
766 | && (symentry.n_sclass == C_EXT || symentry.n_sclass == C_HIDEXT)) | |
767 | { | |
768 | auxentry.x_sym.x_fcnary.x_fcn.x_lnnoptr += bias; | |
769 | lseek (new, -AUXESZ, 1); | |
770 | write (new, &auxentry, AUXESZ); | |
771 | } | |
4e3a36cd JB |
772 | } |
773 | } | |
774 | close (new); | |
76998edb JB |
775 | } |
776 | ||
4e3a36cd | 777 | #endif /* COFF */ |
76998edb | 778 | |
4e3a36cd JB |
779 | #ifdef XCOFF |
780 | ||
781 | /* It is probably a false economy to optimise this routine (it used to | |
782 | read one LDREL and do do two lseeks per iteration) but the wrath of | |
783 | RMS (see above :-) would be too much to bear */ | |
784 | ||
785 | unrelocate_symbols (new, a_out, a_name, new_name) | |
786 | int new, a_out; | |
787 | char *a_name, *new_name; | |
76998edb | 788 | { |
4e3a36cd JB |
789 | register int i; |
790 | register int l; | |
791 | register LDREL *ldrel; | |
792 | LDHDR ldhdr; | |
793 | LDREL ldrel_buf [20]; | |
4a438fc5 RS |
794 | ulong t_reloc = (ulong) &_text - f_ohdr.text_start; |
795 | ulong d_reloc = (ulong) &_data - ALIGN(f_ohdr.data_start, 2); | |
4e3a36cd | 796 | int * p; |
4e3a36cd JB |
797 | |
798 | if (load_scnptr == 0) | |
799 | return 0; | |
800 | ||
801 | lseek (a_out, orig_load_scnptr, 0); | |
802 | if (read (a_out, &ldhdr, sizeof (ldhdr)) != sizeof (ldhdr)) | |
803 | { | |
804 | PERROR (new_name); | |
805 | } | |
806 | ||
807 | #define SYMNDX_TEXT 0 | |
808 | #define SYMNDX_DATA 1 | |
809 | #define SYMNDX_BSS 2 | |
810 | l = 0; | |
811 | for (i = 0; i < ldhdr.l_nreloc; i++, l--, ldrel++) | |
812 | { | |
813 | if (l == 0) { | |
814 | lseek (a_out, | |
815 | orig_load_scnptr + LDHDRSZ + LDSYMSZ*ldhdr.l_nsyms + LDRELSZ*i, | |
816 | 0); | |
817 | ||
818 | l = ldhdr.l_nreloc - i; | |
819 | if (l > sizeof (ldrel_buf) / LDRELSZ) | |
820 | l = sizeof (ldrel_buf) / LDRELSZ; | |
821 | ||
822 | if (read (a_out, ldrel_buf, l * LDRELSZ) != l * LDRELSZ) | |
823 | { | |
824 | PERROR (a_name); | |
825 | } | |
826 | ldrel = ldrel_buf; | |
827 | } | |
4e3a36cd JB |
828 | |
829 | /* move the BSS loader symbols to the DATA segment */ | |
4e3a36cd | 830 | if (ldrel->l_symndx == SYMNDX_BSS) |
4e3a36cd | 831 | { |
91b97ddb RS |
832 | ldrel->l_symndx = SYMNDX_DATA; |
833 | ||
4e3a36cd JB |
834 | lseek (new, |
835 | load_scnptr + LDHDRSZ + LDSYMSZ*ldhdr.l_nsyms + LDRELSZ*i, | |
836 | 0); | |
837 | ||
838 | if (write (new, ldrel, LDRELSZ) != LDRELSZ) | |
839 | { | |
840 | PERROR (new_name); | |
841 | } | |
842 | } | |
843 | ||
844 | if (ldrel->l_rsecnm == f_ohdr.o_sndata) | |
845 | { | |
846 | int orig_int; | |
847 | ||
4a438fc5 RS |
848 | lseek (a_out, |
849 | orig_data_scnptr + (ldrel->l_vaddr - f_ohdr.data_start), 0); | |
4e3a36cd JB |
850 | |
851 | if (read (a_out, (void *) &orig_int, sizeof (orig_int)) != sizeof (orig_int)) | |
852 | { | |
853 | PERROR (a_name); | |
854 | } | |
855 | ||
4a438fc5 RS |
856 | p = (int *) (ldrel->l_vaddr + d_reloc); |
857 | ||
4e3a36cd JB |
858 | switch (ldrel->l_symndx) { |
859 | case SYMNDX_TEXT: | |
4a438fc5 | 860 | orig_int = * p - t_reloc; |
4e3a36cd JB |
861 | break; |
862 | ||
863 | case SYMNDX_DATA: | |
864 | case SYMNDX_BSS: | |
4a438fc5 | 865 | orig_int = * p - d_reloc; |
4e3a36cd JB |
866 | break; |
867 | } | |
868 | ||
4a438fc5 RS |
869 | if (orig_int != * p) |
870 | { | |
871 | lseek (new, | |
872 | data_scnptr + (ldrel->l_vaddr - f_ohdr.data_start), 0); | |
873 | if (write (new, (void *) &orig_int, sizeof (orig_int)) | |
874 | != sizeof (orig_int)) | |
875 | { | |
876 | PERROR (new_name); | |
877 | } | |
878 | } | |
4e3a36cd JB |
879 | } |
880 | } | |
76998edb | 881 | } |
4e3a36cd | 882 | #endif /* XCOFF */ |