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[defined (__alpha__) && !defined (__NetBSD__) && !defined (__OpenBSD__)]:
[bpt/emacs.git] / src / unexelf.c
1 /* Copyright (C) 1985, 1986, 1987, 1988, 1990, 1992
2 Free Software Foundation, Inc.
3
4 This file is part of GNU Emacs.
5
6 GNU Emacs is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
9 any later version.
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
17 along with GNU Emacs; see the file COPYING. If not, write to
18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA.
20
21 In other words, you are welcome to use, share and improve this program.
22 You are forbidden to forbid anyone else to use, share and improve
23 what you give them. Help stamp out software-hoarding! */
24
25
26 /*
27 * unexec.c - Convert a running program into an a.out file.
28 *
29 * Author: Spencer W. Thomas
30 * Computer Science Dept.
31 * University of Utah
32 * Date: Tue Mar 2 1982
33 * Modified heavily since then.
34 *
35 * Synopsis:
36 * unexec (new_name, old_name, data_start, bss_start, entry_address)
37 * char *new_name, *old_name;
38 * unsigned data_start, bss_start, entry_address;
39 *
40 * Takes a snapshot of the program and makes an a.out format file in the
41 * file named by the string argument new_name.
42 * If old_name is non-NULL, the symbol table will be taken from the given file.
43 * On some machines, an existing old_name file is required.
44 *
45 * The boundaries within the a.out file may be adjusted with the data_start
46 * and bss_start arguments. Either or both may be given as 0 for defaults.
47 *
48 * Data_start gives the boundary between the text segment and the data
49 * segment of the program. The text segment can contain shared, read-only
50 * program code and literal data, while the data segment is always unshared
51 * and unprotected. Data_start gives the lowest unprotected address.
52 * The value you specify may be rounded down to a suitable boundary
53 * as required by the machine you are using.
54 *
55 * Specifying zero for data_start means the boundary between text and data
56 * should not be the same as when the program was loaded.
57 * If NO_REMAP is defined, the argument data_start is ignored and the
58 * segment boundaries are never changed.
59 *
60 * Bss_start indicates how much of the data segment is to be saved in the
61 * a.out file and restored when the program is executed. It gives the lowest
62 * unsaved address, and is rounded up to a page boundary. The default when 0
63 * is given assumes that the entire data segment is to be stored, including
64 * the previous data and bss as well as any additional storage allocated with
65 * break (2).
66 *
67 * The new file is set up to start at entry_address.
68 *
69 * If you make improvements I'd like to get them too.
70 * harpo!utah-cs!thomas, thomas@Utah-20
71 *
72 */
73
74 /* Even more heavily modified by james@bigtex.cactus.org of Dell Computer Co.
75 * ELF support added.
76 *
77 * Basic theory: the data space of the running process needs to be
78 * dumped to the output file. Normally we would just enlarge the size
79 * of .data, scooting everything down. But we can't do that in ELF,
80 * because there is often something between the .data space and the
81 * .bss space.
82 *
83 * In the temacs dump below, notice that the Global Offset Table
84 * (.got) and the Dynamic link data (.dynamic) come between .data1 and
85 * .bss. It does not work to overlap .data with these fields.
86 *
87 * The solution is to create a new .data segment. This segment is
88 * filled with data from the current process. Since the contents of
89 * various sections refer to sections by index, the new .data segment
90 * is made the last in the table to avoid changing any existing index.
91
92 * This is an example of how the section headers are changed. "Addr"
93 * is a process virtual address. "Offset" is a file offset.
94
95 raid:/nfs/raid/src/dist-18.56/src> dump -h temacs
96
97 temacs:
98
99 **** SECTION HEADER TABLE ****
100 [No] Type Flags Addr Offset Size Name
101 Link Info Adralgn Entsize
102
103 [1] 1 2 0x80480d4 0xd4 0x13 .interp
104 0 0 0x1 0
105
106 [2] 5 2 0x80480e8 0xe8 0x388 .hash
107 3 0 0x4 0x4
108
109 [3] 11 2 0x8048470 0x470 0x7f0 .dynsym
110 4 1 0x4 0x10
111
112 [4] 3 2 0x8048c60 0xc60 0x3ad .dynstr
113 0 0 0x1 0
114
115 [5] 9 2 0x8049010 0x1010 0x338 .rel.plt
116 3 7 0x4 0x8
117
118 [6] 1 6 0x8049348 0x1348 0x3 .init
119 0 0 0x4 0
120
121 [7] 1 6 0x804934c 0x134c 0x680 .plt
122 0 0 0x4 0x4
123
124 [8] 1 6 0x80499cc 0x19cc 0x3c56f .text
125 0 0 0x4 0
126
127 [9] 1 6 0x8085f3c 0x3df3c 0x3 .fini
128 0 0 0x4 0
129
130 [10] 1 2 0x8085f40 0x3df40 0x69c .rodata
131 0 0 0x4 0
132
133 [11] 1 2 0x80865dc 0x3e5dc 0xd51 .rodata1
134 0 0 0x4 0
135
136 [12] 1 3 0x8088330 0x3f330 0x20afc .data
137 0 0 0x4 0
138
139 [13] 1 3 0x80a8e2c 0x5fe2c 0x89d .data1
140 0 0 0x4 0
141
142 [14] 1 3 0x80a96cc 0x606cc 0x1a8 .got
143 0 0 0x4 0x4
144
145 [15] 6 3 0x80a9874 0x60874 0x80 .dynamic
146 4 0 0x4 0x8
147
148 [16] 8 3 0x80a98f4 0x608f4 0x449c .bss
149 0 0 0x4 0
150
151 [17] 2 0 0 0x608f4 0x9b90 .symtab
152 18 371 0x4 0x10
153
154 [18] 3 0 0 0x6a484 0x8526 .strtab
155 0 0 0x1 0
156
157 [19] 3 0 0 0x729aa 0x93 .shstrtab
158 0 0 0x1 0
159
160 [20] 1 0 0 0x72a3d 0x68b7 .comment
161 0 0 0x1 0
162
163 raid:/nfs/raid/src/dist-18.56/src> dump -h xemacs
164
165 xemacs:
166
167 **** SECTION HEADER TABLE ****
168 [No] Type Flags Addr Offset Size Name
169 Link Info Adralgn Entsize
170
171 [1] 1 2 0x80480d4 0xd4 0x13 .interp
172 0 0 0x1 0
173
174 [2] 5 2 0x80480e8 0xe8 0x388 .hash
175 3 0 0x4 0x4
176
177 [3] 11 2 0x8048470 0x470 0x7f0 .dynsym
178 4 1 0x4 0x10
179
180 [4] 3 2 0x8048c60 0xc60 0x3ad .dynstr
181 0 0 0x1 0
182
183 [5] 9 2 0x8049010 0x1010 0x338 .rel.plt
184 3 7 0x4 0x8
185
186 [6] 1 6 0x8049348 0x1348 0x3 .init
187 0 0 0x4 0
188
189 [7] 1 6 0x804934c 0x134c 0x680 .plt
190 0 0 0x4 0x4
191
192 [8] 1 6 0x80499cc 0x19cc 0x3c56f .text
193 0 0 0x4 0
194
195 [9] 1 6 0x8085f3c 0x3df3c 0x3 .fini
196 0 0 0x4 0
197
198 [10] 1 2 0x8085f40 0x3df40 0x69c .rodata
199 0 0 0x4 0
200
201 [11] 1 2 0x80865dc 0x3e5dc 0xd51 .rodata1
202 0 0 0x4 0
203
204 [12] 1 3 0x8088330 0x3f330 0x20afc .data
205 0 0 0x4 0
206
207 [13] 1 3 0x80a8e2c 0x5fe2c 0x89d .data1
208 0 0 0x4 0
209
210 [14] 1 3 0x80a96cc 0x606cc 0x1a8 .got
211 0 0 0x4 0x4
212
213 [15] 6 3 0x80a9874 0x60874 0x80 .dynamic
214 4 0 0x4 0x8
215
216 [16] 8 3 0x80c6800 0x7d800 0 .bss
217 0 0 0x4 0
218
219 [17] 2 0 0 0x7d800 0x9b90 .symtab
220 18 371 0x4 0x10
221
222 [18] 3 0 0 0x87390 0x8526 .strtab
223 0 0 0x1 0
224
225 [19] 3 0 0 0x8f8b6 0x93 .shstrtab
226 0 0 0x1 0
227
228 [20] 1 0 0 0x8f949 0x68b7 .comment
229 0 0 0x1 0
230
231 [21] 1 3 0x80a98f4 0x608f4 0x1cf0c .data
232 0 0 0x4 0
233
234 * This is an example of how the file header is changed. "Shoff" is
235 * the section header offset within the file. Since that table is
236 * after the new .data section, it is moved. "Shnum" is the number of
237 * sections, which we increment.
238 *
239 * "Phoff" is the file offset to the program header. "Phentsize" and
240 * "Shentsz" are the program and section header entries sizes respectively.
241 * These can be larger than the apparent struct sizes.
242
243 raid:/nfs/raid/src/dist-18.56/src> dump -f temacs
244
245 temacs:
246
247 **** ELF HEADER ****
248 Class Data Type Machine Version
249 Entry Phoff Shoff Flags Ehsize
250 Phentsize Phnum Shentsz Shnum Shstrndx
251
252 1 1 2 3 1
253 0x80499cc 0x34 0x792f4 0 0x34
254 0x20 5 0x28 21 19
255
256 raid:/nfs/raid/src/dist-18.56/src> dump -f xemacs
257
258 xemacs:
259
260 **** ELF HEADER ****
261 Class Data Type Machine Version
262 Entry Phoff Shoff Flags Ehsize
263 Phentsize Phnum Shentsz Shnum Shstrndx
264
265 1 1 2 3 1
266 0x80499cc 0x34 0x96200 0 0x34
267 0x20 5 0x28 22 19
268
269 * These are the program headers. "Offset" is the file offset to the
270 * segment. "Vaddr" is the memory load address. "Filesz" is the
271 * segment size as it appears in the file, and "Memsz" is the size in
272 * memory. Below, the third segment is the code and the fourth is the
273 * data: the difference between Filesz and Memsz is .bss
274
275 raid:/nfs/raid/src/dist-18.56/src> dump -o temacs
276
277 temacs:
278 ***** PROGRAM EXECUTION HEADER *****
279 Type Offset Vaddr Paddr
280 Filesz Memsz Flags Align
281
282 6 0x34 0x8048034 0
283 0xa0 0xa0 5 0
284
285 3 0xd4 0 0
286 0x13 0 4 0
287
288 1 0x34 0x8048034 0
289 0x3f2f9 0x3f2f9 5 0x1000
290
291 1 0x3f330 0x8088330 0
292 0x215c4 0x25a60 7 0x1000
293
294 2 0x60874 0x80a9874 0
295 0x80 0 7 0
296
297 raid:/nfs/raid/src/dist-18.56/src> dump -o xemacs
298
299 xemacs:
300 ***** PROGRAM EXECUTION HEADER *****
301 Type Offset Vaddr Paddr
302 Filesz Memsz Flags Align
303
304 6 0x34 0x8048034 0
305 0xa0 0xa0 5 0
306
307 3 0xd4 0 0
308 0x13 0 4 0
309
310 1 0x34 0x8048034 0
311 0x3f2f9 0x3f2f9 5 0x1000
312
313 1 0x3f330 0x8088330 0
314 0x3e4d0 0x3e4d0 7 0x1000
315
316 2 0x60874 0x80a9874 0
317 0x80 0 7 0
318
319
320 */
321 \f
322 /* Modified by wtien@urbana.mcd.mot.com of Motorola Inc.
323 *
324 * The above mechanism does not work if the unexeced ELF file is being
325 * re-layout by other applications (such as `strip'). All the applications
326 * that re-layout the internal of ELF will layout all sections in ascending
327 * order of their file offsets. After the re-layout, the data2 section will
328 * still be the LAST section in the section header vector, but its file offset
329 * is now being pushed far away down, and causes part of it not to be mapped
330 * in (ie. not covered by the load segment entry in PHDR vector), therefore
331 * causes the new binary to fail.
332 *
333 * The solution is to modify the unexec algorithm to insert the new data2
334 * section header right before the new bss section header, so their file
335 * offsets will be in the ascending order. Since some of the section's (all
336 * sections AFTER the bss section) indexes are now changed, we also need to
337 * modify some fields to make them point to the right sections. This is done
338 * by macro PATCH_INDEX. All the fields that need to be patched are:
339 *
340 * 1. ELF header e_shstrndx field.
341 * 2. section header sh_link and sh_info field.
342 * 3. symbol table entry st_shndx field.
343 *
344 * The above example now should look like:
345
346 **** SECTION HEADER TABLE ****
347 [No] Type Flags Addr Offset Size Name
348 Link Info Adralgn Entsize
349
350 [1] 1 2 0x80480d4 0xd4 0x13 .interp
351 0 0 0x1 0
352
353 [2] 5 2 0x80480e8 0xe8 0x388 .hash
354 3 0 0x4 0x4
355
356 [3] 11 2 0x8048470 0x470 0x7f0 .dynsym
357 4 1 0x4 0x10
358
359 [4] 3 2 0x8048c60 0xc60 0x3ad .dynstr
360 0 0 0x1 0
361
362 [5] 9 2 0x8049010 0x1010 0x338 .rel.plt
363 3 7 0x4 0x8
364
365 [6] 1 6 0x8049348 0x1348 0x3 .init
366 0 0 0x4 0
367
368 [7] 1 6 0x804934c 0x134c 0x680 .plt
369 0 0 0x4 0x4
370
371 [8] 1 6 0x80499cc 0x19cc 0x3c56f .text
372 0 0 0x4 0
373
374 [9] 1 6 0x8085f3c 0x3df3c 0x3 .fini
375 0 0 0x4 0
376
377 [10] 1 2 0x8085f40 0x3df40 0x69c .rodata
378 0 0 0x4 0
379
380 [11] 1 2 0x80865dc 0x3e5dc 0xd51 .rodata1
381 0 0 0x4 0
382
383 [12] 1 3 0x8088330 0x3f330 0x20afc .data
384 0 0 0x4 0
385
386 [13] 1 3 0x80a8e2c 0x5fe2c 0x89d .data1
387 0 0 0x4 0
388
389 [14] 1 3 0x80a96cc 0x606cc 0x1a8 .got
390 0 0 0x4 0x4
391
392 [15] 6 3 0x80a9874 0x60874 0x80 .dynamic
393 4 0 0x4 0x8
394
395 [16] 1 3 0x80a98f4 0x608f4 0x1cf0c .data
396 0 0 0x4 0
397
398 [17] 8 3 0x80c6800 0x7d800 0 .bss
399 0 0 0x4 0
400
401 [18] 2 0 0 0x7d800 0x9b90 .symtab
402 19 371 0x4 0x10
403
404 [19] 3 0 0 0x87390 0x8526 .strtab
405 0 0 0x1 0
406
407 [20] 3 0 0 0x8f8b6 0x93 .shstrtab
408 0 0 0x1 0
409
410 [21] 1 0 0 0x8f949 0x68b7 .comment
411 0 0 0x1 0
412
413 */
414 \f
415 #include <sys/types.h>
416 #include <stdio.h>
417 #include <sys/stat.h>
418 #include <memory.h>
419 #include <string.h>
420 #include <errno.h>
421 #include <unistd.h>
422 #include <fcntl.h>
423 #if !defined (__NetBSD__) && !defined (__OpenBSD__)
424 #include <elf.h>
425 #endif
426 #include <sys/mman.h>
427 #if defined (__sony_news) && defined (_SYSTYPE_SYSV)
428 #include <sys/elf_mips.h>
429 #include <sym.h>
430 #endif /* __sony_news && _SYSTYPE_SYSV */
431
432 #if defined (__alpha__) && !defined (__NetBSD__) && !defined (__OpenBSD__)
433 /* Declare COFF debugging symbol table. This used to be in
434 /usr/include/sym.h, but this file is no longer included in Red Hat
435 5.0 and presumably in any other glibc 2.x based distribution. */
436 typedef struct {
437 short magic;
438 short vstamp;
439 int ilineMax;
440 int idnMax;
441 int ipdMax;
442 int isymMax;
443 int ioptMax;
444 int iauxMax;
445 int issMax;
446 int issExtMax;
447 int ifdMax;
448 int crfd;
449 int iextMax;
450 long cbLine;
451 long cbLineOffset;
452 long cbDnOffset;
453 long cbPdOffset;
454 long cbSymOffset;
455 long cbOptOffset;
456 long cbAuxOffset;
457 long cbSsOffset;
458 long cbSsExtOffset;
459 long cbFdOffset;
460 long cbRfdOffset;
461 long cbExtOffset;
462 } HDRR, *pHDRR;
463 #define cbHDRR sizeof(HDRR)
464 #define hdrNil ((pHDRR)0)
465 #endif
466
467 #ifdef __NetBSD__
468 /*
469 * NetBSD does not have normal-looking user-land ELF support.
470 */
471 # ifdef __alpha__
472 # define ELFSIZE 64
473 # else
474 # define ELFSIZE 32
475 # endif
476 # include <sys/exec_elf.h>
477
478 # define PT_LOAD Elf_pt_load
479 # define SHT_SYMTAB Elf_sht_symtab
480 # define SHT_DYNSYM Elf_sht_dynsym
481 # define SHT_NULL Elf_sht_null
482 # define SHT_NOBITS Elf_sht_nobits
483 # define SHT_REL Elf_sht_rel
484 # define SHT_RELA Elf_sht_rela
485
486 # define SHN_UNDEF Elf_eshn_undefined
487 # define SHN_ABS Elf_eshn_absolute
488 # define SHN_COMMON Elf_eshn_common
489
490 /*
491 * The magic of picking the right size types is handled by the ELFSIZE
492 * definition above.
493 */
494 # ifdef __STDC__
495 # define ElfW(type) Elf_##type
496 # else
497 # define ElfW(type) Elf_/**/type
498 # endif
499
500 # ifdef __alpha__
501 # include <sys/exec_ecoff.h>
502 # define HDRR struct ecoff_symhdr
503 # define pHDRR HDRR *
504 # endif
505 #endif /* __NetBSD__ */
506
507 #ifdef __OpenBSD__
508 # include <sys/exec_elf.h>
509 #endif
510
511 #if __GNU_LIBRARY__ - 0 >= 6
512 # include <link.h> /* get ElfW etc */
513 #endif
514
515 #ifndef ElfW
516 # ifdef __STDC__
517 # define ElfW(type) Elf32_##type
518 # else
519 # define ElfW(type) Elf32_/**/type
520 # endif
521 #endif
522
523 #ifndef emacs
524 #define fatal(a, b, c) fprintf (stderr, a, b, c), exit (1)
525 #else
526 #include <config.h>
527 extern void fatal (char *, ...);
528 #endif
529
530 #ifndef ELF_BSS_SECTION_NAME
531 #define ELF_BSS_SECTION_NAME ".bss"
532 #endif
533
534 /* Get the address of a particular section or program header entry,
535 * accounting for the size of the entries.
536 */
537 /*
538 On PPC Reference Platform running Solaris 2.5.1
539 the plt section is also of type NOBI like the bss section.
540 (not really stored) and therefore sections after the bss
541 section start at the plt offset. The plt section is always
542 the one just before the bss section.
543 Thus, we modify the test from
544 if (NEW_SECTION_H (nn).sh_offset >= new_data2_offset)
545 to
546 if (NEW_SECTION_H (nn).sh_offset >=
547 OLD_SECTION_H (old_bss_index-1).sh_offset)
548 This is just a hack. We should put the new data section
549 before the .plt section.
550 And we should not have this routine at all but use
551 the libelf library to read the old file and create the new
552 file.
553 The changed code is minimal and depends on prep set in m/prep.h
554 Erik Deumens
555 Quantum Theory Project
556 University of Florida
557 deumens@qtp.ufl.edu
558 Apr 23, 1996
559 */
560
561 #define OLD_SECTION_H(n) \
562 (*(ElfW(Shdr) *) ((byte *) old_section_h + old_file_h->e_shentsize * (n)))
563 #define NEW_SECTION_H(n) \
564 (*(ElfW(Shdr) *) ((byte *) new_section_h + new_file_h->e_shentsize * (n)))
565 #define OLD_PROGRAM_H(n) \
566 (*(ElfW(Phdr) *) ((byte *) old_program_h + old_file_h->e_phentsize * (n)))
567 #define NEW_PROGRAM_H(n) \
568 (*(ElfW(Phdr) *) ((byte *) new_program_h + new_file_h->e_phentsize * (n)))
569
570 #define PATCH_INDEX(n) \
571 do { \
572 if ((int) (n) >= old_bss_index) \
573 (n)++; } while (0)
574 typedef unsigned char byte;
575
576 /* Round X up to a multiple of Y. */
577
578 ElfW(Addr)
579 round_up (x, y)
580 ElfW(Addr) x, y;
581 {
582 int rem = x % y;
583 if (rem == 0)
584 return x;
585 return x - rem + y;
586 }
587
588 /* ****************************************************************
589 * unexec
590 *
591 * driving logic.
592 *
593 * In ELF, this works by replacing the old .bss section with a new
594 * .data section, and inserting an empty .bss immediately afterwards.
595 *
596 */
597 void
598 unexec (new_name, old_name, data_start, bss_start, entry_address)
599 char *new_name, *old_name;
600 unsigned data_start, bss_start, entry_address;
601 {
602 int new_file, old_file, new_file_size;
603
604 /* Pointers to the base of the image of the two files. */
605 caddr_t old_base, new_base;
606
607 /* Pointers to the file, program and section headers for the old and new
608 * files.
609 */
610 ElfW(Ehdr) *old_file_h, *new_file_h;
611 ElfW(Phdr) *old_program_h, *new_program_h;
612 ElfW(Shdr) *old_section_h, *new_section_h;
613
614 /* Point to the section name table in the old file */
615 char *old_section_names;
616
617 ElfW(Addr) old_bss_addr, new_bss_addr;
618 ElfW(Word) old_bss_size, new_data2_size;
619 ElfW(Off) new_data2_offset;
620 ElfW(Addr) new_data2_addr;
621
622 int n, nn, old_bss_index, old_data_index, new_data2_index;
623 #if defined ( __sony_news) && defined (_SYSTYPE_SYSV)
624 int old_sbss_index, old_mdebug_index;
625 #endif /* __sony_news && _SYSTYPE_SYSV */
626 struct stat stat_buf;
627
628 /* Open the old file & map it into the address space. */
629
630 old_file = open (old_name, O_RDONLY);
631
632 if (old_file < 0)
633 fatal ("Can't open %s for reading: errno %d\n", old_name, errno);
634
635 if (fstat (old_file, &stat_buf) == -1)
636 fatal ("Can't fstat (%s): errno %d\n", old_name, errno);
637
638 old_base = mmap ((caddr_t) 0, stat_buf.st_size, PROT_READ, MAP_SHARED,
639 old_file, 0);
640
641 if (old_base == (caddr_t) -1)
642 fatal ("Can't mmap (%s): errno %d\n", old_name, errno);
643
644 #ifdef DEBUG
645 fprintf (stderr, "mmap (%s, %x) -> %x\n", old_name, stat_buf.st_size,
646 old_base);
647 #endif
648
649 /* Get pointers to headers & section names */
650
651 old_file_h = (ElfW(Ehdr) *) old_base;
652 old_program_h = (ElfW(Phdr) *) ((byte *) old_base + old_file_h->e_phoff);
653 old_section_h = (ElfW(Shdr) *) ((byte *) old_base + old_file_h->e_shoff);
654 old_section_names = (char *) old_base
655 + OLD_SECTION_H (old_file_h->e_shstrndx).sh_offset;
656
657 /* Find the old .bss section. Figure out parameters of the new
658 * data2 and bss sections.
659 */
660
661 for (old_bss_index = 1; old_bss_index < (int) old_file_h->e_shnum;
662 old_bss_index++)
663 {
664 #ifdef DEBUG
665 fprintf (stderr, "Looking for .bss - found %s\n",
666 old_section_names + OLD_SECTION_H (old_bss_index).sh_name);
667 #endif
668 if (!strcmp (old_section_names + OLD_SECTION_H (old_bss_index).sh_name,
669 ELF_BSS_SECTION_NAME))
670 break;
671 }
672 if (old_bss_index == old_file_h->e_shnum)
673 fatal ("Can't find .bss in %s.\n", old_name, 0);
674
675 #if defined (__sony_news) && defined (_SYSTYPE_SYSV)
676 for (old_sbss_index = 1; old_sbss_index < (int) old_file_h->e_shnum;
677 old_sbss_index++)
678 {
679 #ifdef DEBUG
680 fprintf (stderr, "Looking for .sbss - found %s\n",
681 old_section_names + OLD_SECTION_H (old_sbss_index).sh_name);
682 #endif
683 if (!strcmp (old_section_names + OLD_SECTION_H (old_sbss_index).sh_name,
684 ".sbss"))
685 break;
686 }
687 if (old_sbss_index == old_file_h->e_shnum)
688 {
689 old_bss_addr = OLD_SECTION_H(old_bss_index).sh_addr;
690 old_bss_size = OLD_SECTION_H(old_bss_index).sh_size;
691 new_data2_offset = OLD_SECTION_H(old_bss_index).sh_offset;
692 new_data2_index = old_bss_index;
693 }
694 else
695 {
696 old_bss_addr = OLD_SECTION_H(old_sbss_index).sh_addr;
697 old_bss_size = OLD_SECTION_H(old_bss_index).sh_size
698 + OLD_SECTION_H(old_sbss_index).sh_size;
699 new_data2_offset = OLD_SECTION_H(old_sbss_index).sh_offset;
700 new_data2_index = old_sbss_index;
701 }
702
703 for (old_mdebug_index = 1; old_mdebug_index < (int) old_file_h->e_shnum;
704 old_mdebug_index++)
705 {
706 #ifdef DEBUG
707 fprintf (stderr, "Looking for .mdebug - found %s\n",
708 old_section_names + OLD_SECTION_H (old_mdebug_index).sh_name);
709 #endif
710 if (!strcmp (old_section_names + OLD_SECTION_H (old_mdebug_index).sh_name,
711 ".mdebug"))
712 break;
713 }
714 if (old_mdebug_index == old_file_h->e_shnum)
715 old_mdebug_index = 0;
716 #else /* not (__sony_news && _SYSTYPE_SYSV) */
717 old_bss_addr = OLD_SECTION_H (old_bss_index).sh_addr;
718 old_bss_size = OLD_SECTION_H (old_bss_index).sh_size;
719 #endif /* not (__sony_news && _SYSTYPE_SYSV) */
720 #if defined (emacs) || !defined (DEBUG)
721 new_bss_addr = (ElfW(Addr)) sbrk (0);
722 #else
723 new_bss_addr = old_bss_addr + old_bss_size + 0x1234;
724 #endif
725 new_data2_addr = old_bss_addr;
726 new_data2_size = new_bss_addr - old_bss_addr;
727 #if !defined (__sony_news) || !defined (_SYSTYPE_SYSV)
728 new_data2_offset = OLD_SECTION_H (old_bss_index).sh_offset;
729 #endif /* not (__sony_news && _SYSTYPE_SYSV) */
730
731 #ifdef DEBUG
732 fprintf (stderr, "old_bss_index %d\n", old_bss_index);
733 fprintf (stderr, "old_bss_addr %x\n", old_bss_addr);
734 fprintf (stderr, "old_bss_size %x\n", old_bss_size);
735 fprintf (stderr, "new_bss_addr %x\n", new_bss_addr);
736 fprintf (stderr, "new_data2_addr %x\n", new_data2_addr);
737 fprintf (stderr, "new_data2_size %x\n", new_data2_size);
738 fprintf (stderr, "new_data2_offset %x\n", new_data2_offset);
739 #endif
740
741 if ((unsigned) new_bss_addr < (unsigned) old_bss_addr + old_bss_size)
742 fatal (".bss shrank when undumping???\n", 0, 0);
743
744 /* Set the output file to the right size and mmap it. Set
745 * pointers to various interesting objects. stat_buf still has
746 * old_file data.
747 */
748
749 new_file = open (new_name, O_RDWR | O_CREAT, 0666);
750 if (new_file < 0)
751 fatal ("Can't creat (%s): errno %d\n", new_name, errno);
752
753 new_file_size = stat_buf.st_size + old_file_h->e_shentsize + new_data2_size;
754
755 if (ftruncate (new_file, new_file_size))
756 fatal ("Can't ftruncate (%s): errno %d\n", new_name, errno);
757
758 #ifdef UNEXEC_USE_MAP_PRIVATE
759 new_base = mmap ((caddr_t) 0, new_file_size, PROT_READ | PROT_WRITE,
760 MAP_PRIVATE, new_file, 0);
761 #else
762 new_base = mmap ((caddr_t) 0, new_file_size, PROT_READ | PROT_WRITE,
763 MAP_SHARED, new_file, 0);
764 #endif
765
766 if (new_base == (caddr_t) -1)
767 fatal ("Can't mmap (%s): errno %d\n", new_name, errno);
768
769 new_file_h = (ElfW(Ehdr) *) new_base;
770 new_program_h = (ElfW(Phdr) *) ((byte *) new_base + old_file_h->e_phoff);
771 new_section_h = (ElfW(Shdr) *)
772 ((byte *) new_base + old_file_h->e_shoff + new_data2_size);
773
774 /* Make our new file, program and section headers as copies of the
775 * originals.
776 */
777
778 memcpy (new_file_h, old_file_h, old_file_h->e_ehsize);
779 memcpy (new_program_h, old_program_h,
780 old_file_h->e_phnum * old_file_h->e_phentsize);
781
782 /* Modify the e_shstrndx if necessary. */
783 PATCH_INDEX (new_file_h->e_shstrndx);
784
785 /* Fix up file header. We'll add one section. Section header is
786 * further away now.
787 */
788
789 new_file_h->e_shoff += new_data2_size;
790 new_file_h->e_shnum += 1;
791
792 #ifdef DEBUG
793 fprintf (stderr, "Old section offset %x\n", old_file_h->e_shoff);
794 fprintf (stderr, "Old section count %d\n", old_file_h->e_shnum);
795 fprintf (stderr, "New section offset %x\n", new_file_h->e_shoff);
796 fprintf (stderr, "New section count %d\n", new_file_h->e_shnum);
797 #endif
798
799 /* Fix up a new program header. Extend the writable data segment so
800 * that the bss area is covered too. Find that segment by looking
801 * for a segment that ends just before the .bss area. Make sure
802 * that no segments are above the new .data2. Put a loop at the end
803 * to adjust the offset and address of any segment that is above
804 * data2, just in case we decide to allow this later.
805 */
806
807 for (n = new_file_h->e_phnum - 1; n >= 0; n--)
808 {
809 /* Compute maximum of all requirements for alignment of section. */
810 int alignment = (NEW_PROGRAM_H (n)).p_align;
811 if ((OLD_SECTION_H (old_bss_index)).sh_addralign > alignment)
812 alignment = OLD_SECTION_H (old_bss_index).sh_addralign;
813
814 #if defined (__sony_news) && defined (_SYSTYPE_SYSV)
815 if (NEW_PROGRAM_H (n).p_vaddr + NEW_PROGRAM_H (n).p_filesz
816 > round_up (old_bss_addr, alignment))
817 fatal ("Program segment above .bss in %s\n", old_name, 0);
818 #else /* not (__sony_news && _SYSTYPE_SYSV) */
819 if (NEW_PROGRAM_H (n).p_vaddr + NEW_PROGRAM_H (n).p_filesz > old_bss_addr)
820 fatal ("Program segment above .bss in %s\n", old_name, 0);
821 #endif /* not (__sony_news && _SYSTYPE_SYSV) */
822
823 if (NEW_PROGRAM_H (n).p_type == PT_LOAD
824 && (round_up ((NEW_PROGRAM_H (n)).p_vaddr
825 + (NEW_PROGRAM_H (n)).p_filesz,
826 alignment)
827 == round_up (old_bss_addr, alignment)))
828 break;
829 }
830 if (n < 0)
831 fatal ("Couldn't find segment next to .bss in %s\n", old_name, 0);
832
833 /* Make sure that the size includes any padding before the old .bss
834 section. */
835 NEW_PROGRAM_H (n).p_filesz = new_bss_addr - NEW_PROGRAM_H (n).p_vaddr;
836 NEW_PROGRAM_H (n).p_memsz = NEW_PROGRAM_H (n).p_filesz;
837
838 #if 0 /* Maybe allow section after data2 - does this ever happen? */
839 for (n = new_file_h->e_phnum - 1; n >= 0; n--)
840 {
841 if (NEW_PROGRAM_H (n).p_vaddr
842 && NEW_PROGRAM_H (n).p_vaddr >= new_data2_addr)
843 NEW_PROGRAM_H (n).p_vaddr += new_data2_size - old_bss_size;
844
845 if (NEW_PROGRAM_H (n).p_offset >= new_data2_offset)
846 NEW_PROGRAM_H (n).p_offset += new_data2_size;
847 }
848 #endif
849
850 /* Fix up section headers based on new .data2 section. Any section
851 * whose offset or virtual address is after the new .data2 section
852 * gets its value adjusted. .bss size becomes zero and new address
853 * is set. data2 section header gets added by copying the existing
854 * .data header and modifying the offset, address and size.
855 */
856 for (old_data_index = 1; old_data_index < (int) old_file_h->e_shnum;
857 old_data_index++)
858 if (!strcmp (old_section_names + OLD_SECTION_H (old_data_index).sh_name,
859 ".data"))
860 break;
861 if (old_data_index == old_file_h->e_shnum)
862 fatal ("Can't find .data in %s.\n", old_name, 0);
863
864 /* Walk through all section headers, insert the new data2 section right
865 before the new bss section. */
866 for (n = 1, nn = 1; n < (int) old_file_h->e_shnum; n++, nn++)
867 {
868 caddr_t src;
869 int temp_index;
870 #if defined (__sony_news) && defined (_SYSTYPE_SYSV)
871 /* If it is (s)bss section, insert the new data2 section before it. */
872 /* new_data2_index is the index of either old_sbss or old_bss, that was
873 chosen as a section for new_data2. */
874 temp_index = new_data2_index;
875 #else /* not (__sony_news && _SYSTYPE_SYSV) */
876 /* If it is bss section, insert the new data2 section before it. */
877 temp_index = old_bss_index;
878 #endif /* not (__sony_news && _SYSTYPE_SYSV) */
879 if (n == temp_index)
880 {
881 /* Steal the data section header for this data2 section. */
882 memcpy (&NEW_SECTION_H (nn), &OLD_SECTION_H (old_data_index),
883 new_file_h->e_shentsize);
884
885 NEW_SECTION_H (nn).sh_addr = new_data2_addr;
886 NEW_SECTION_H (nn).sh_offset = new_data2_offset;
887 NEW_SECTION_H (nn).sh_size = new_data2_size;
888 /* Use the bss section's alignment. This will assure that the
889 new data2 section always be placed in the same spot as the old
890 bss section by any other application. */
891 NEW_SECTION_H (nn).sh_addralign = OLD_SECTION_H (n).sh_addralign;
892
893 /* Now copy over what we have in the memory now. */
894 memcpy (NEW_SECTION_H (nn).sh_offset + new_base,
895 (caddr_t) OLD_SECTION_H (n).sh_addr,
896 new_data2_size);
897 nn++;
898 }
899
900 memcpy (&NEW_SECTION_H (nn), &OLD_SECTION_H (n),
901 old_file_h->e_shentsize);
902
903 if (n == old_bss_index
904 #if defined (__sony_news) && defined (_SYSTYPE_SYSV)
905 /* The new bss and sbss section's size is zero, and its file offset
906 and virtual address should be off by NEW_DATA2_SIZE. */
907 || n == old_sbss_index
908 #endif /* __sony_news and _SYSTYPE_SYSV */
909 )
910 {
911 /* NN should be `old_bss_index + 1' at this point. */
912 NEW_SECTION_H (nn).sh_offset += new_data2_size;
913 NEW_SECTION_H (nn).sh_addr += new_data2_size;
914 /* Let the new bss section address alignment be the same as the
915 section address alignment followed the old bss section, so
916 this section will be placed in exactly the same place. */
917 NEW_SECTION_H (nn).sh_addralign = OLD_SECTION_H (nn).sh_addralign;
918 NEW_SECTION_H (nn).sh_size = 0;
919 }
920 else
921 {
922 /* Any section that was original placed AFTER the bss
923 section should now be off by NEW_DATA2_SIZE. */
924 #ifdef SOLARIS_POWERPC
925 /* On PPC Reference Platform running Solaris 2.5.1
926 the plt section is also of type NOBI like the bss section.
927 (not really stored) and therefore sections after the bss
928 section start at the plt offset. The plt section is always
929 the one just before the bss section.
930 It would be better to put the new data section before
931 the .plt section, or use libelf instead.
932 Erik Deumens, deumens@qtp.ufl.edu. */
933 if (NEW_SECTION_H (nn).sh_offset
934 >= OLD_SECTION_H (old_bss_index-1).sh_offset)
935 NEW_SECTION_H (nn).sh_offset += new_data2_size;
936 #else
937 if (round_up (NEW_SECTION_H (nn).sh_offset,
938 OLD_SECTION_H (old_bss_index).sh_addralign)
939 >= new_data2_offset)
940 NEW_SECTION_H (nn).sh_offset += new_data2_size;
941 #endif
942 /* Any section that was originally placed after the section
943 header table should now be off by the size of one section
944 header table entry. */
945 if (NEW_SECTION_H (nn).sh_offset > new_file_h->e_shoff)
946 NEW_SECTION_H (nn).sh_offset += new_file_h->e_shentsize;
947 }
948
949 /* If any section hdr refers to the section after the new .data
950 section, make it refer to next one because we have inserted
951 a new section in between. */
952
953 PATCH_INDEX (NEW_SECTION_H (nn).sh_link);
954 /* For symbol tables, info is a symbol table index,
955 so don't change it. */
956 if (NEW_SECTION_H (nn).sh_type != SHT_SYMTAB
957 && NEW_SECTION_H (nn).sh_type != SHT_DYNSYM)
958 PATCH_INDEX (NEW_SECTION_H (nn).sh_info);
959
960 /* Now, start to copy the content of sections. */
961 if (NEW_SECTION_H (nn).sh_type == SHT_NULL
962 || NEW_SECTION_H (nn).sh_type == SHT_NOBITS)
963 continue;
964
965 /* Write out the sections. .data and .data1 (and data2, called
966 ".data" in the strings table) get copied from the current process
967 instead of the old file. */
968 if (!strcmp (old_section_names + NEW_SECTION_H (n).sh_name, ".data")
969 #ifdef _nec_ews_svr4 /* hir, 1994.6.13 */
970 || !strcmp ((old_section_names + NEW_SECTION_H(n).sh_name),
971 ".sdata")
972 #endif
973 #if defined (__sony_news) && defined (_SYSTYPE_SYSV)
974 || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
975 ".sdata")
976 || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
977 ".lit4")
978 || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
979 ".lit8")
980 #endif /* __sony_news && _SYSTYPE_SYSV */
981 || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
982 ".data1"))
983 src = (caddr_t) OLD_SECTION_H (n).sh_addr;
984 else
985 src = old_base + OLD_SECTION_H (n).sh_offset;
986
987 memcpy (NEW_SECTION_H (nn).sh_offset + new_base, src,
988 NEW_SECTION_H (nn).sh_size);
989
990 #ifdef __alpha__
991 /* Update Alpha COFF symbol table: */
992 if (strcmp (old_section_names + OLD_SECTION_H (n).sh_name, ".mdebug")
993 == 0)
994 {
995 pHDRR symhdr = (pHDRR) (NEW_SECTION_H (nn).sh_offset + new_base);
996
997 symhdr->cbLineOffset += new_data2_size;
998 symhdr->cbDnOffset += new_data2_size;
999 symhdr->cbPdOffset += new_data2_size;
1000 symhdr->cbSymOffset += new_data2_size;
1001 symhdr->cbOptOffset += new_data2_size;
1002 symhdr->cbAuxOffset += new_data2_size;
1003 symhdr->cbSsOffset += new_data2_size;
1004 symhdr->cbSsExtOffset += new_data2_size;
1005 symhdr->cbFdOffset += new_data2_size;
1006 symhdr->cbRfdOffset += new_data2_size;
1007 symhdr->cbExtOffset += new_data2_size;
1008 }
1009 #endif /* __alpha__ */
1010
1011 #if defined (__sony_news) && defined (_SYSTYPE_SYSV)
1012 if (NEW_SECTION_H (nn).sh_type == SHT_MIPS_DEBUG && old_mdebug_index)
1013 {
1014 int diff = NEW_SECTION_H(nn).sh_offset
1015 - OLD_SECTION_H(old_mdebug_index).sh_offset;
1016 HDRR *phdr = (HDRR *)(NEW_SECTION_H (nn).sh_offset + new_base);
1017
1018 if (diff)
1019 {
1020 phdr->cbLineOffset += diff;
1021 phdr->cbDnOffset += diff;
1022 phdr->cbPdOffset += diff;
1023 phdr->cbSymOffset += diff;
1024 phdr->cbOptOffset += diff;
1025 phdr->cbAuxOffset += diff;
1026 phdr->cbSsOffset += diff;
1027 phdr->cbSsExtOffset += diff;
1028 phdr->cbFdOffset += diff;
1029 phdr->cbRfdOffset += diff;
1030 phdr->cbExtOffset += diff;
1031 }
1032 }
1033 #endif /* __sony_news && _SYSTYPE_SYSV */
1034 /* If it is the symbol table, its st_shndx field needs to be patched. */
1035 if (NEW_SECTION_H (nn).sh_type == SHT_SYMTAB
1036 || NEW_SECTION_H (nn).sh_type == SHT_DYNSYM)
1037 {
1038 ElfW(Shdr) *spt = &NEW_SECTION_H (nn);
1039 unsigned int num = spt->sh_size / spt->sh_entsize;
1040 ElfW(Sym) * sym = (ElfW(Sym) *) (NEW_SECTION_H (nn).sh_offset +
1041 new_base);
1042 for (; num--; sym++)
1043 {
1044 if ((sym->st_shndx == SHN_UNDEF)
1045 || (sym->st_shndx == SHN_ABS)
1046 || (sym->st_shndx == SHN_COMMON))
1047 continue;
1048
1049 PATCH_INDEX (sym->st_shndx);
1050 }
1051 }
1052 }
1053
1054 /* Update the symbol values of _edata and _end. */
1055 for (n = new_file_h->e_shnum - 1; n; n--)
1056 {
1057 byte *symnames;
1058 ElfW(Sym) *symp, *symendp;
1059
1060 if (NEW_SECTION_H (n).sh_type != SHT_DYNSYM
1061 && NEW_SECTION_H (n).sh_type != SHT_SYMTAB)
1062 continue;
1063
1064 symnames = ((byte *) new_base
1065 + NEW_SECTION_H (NEW_SECTION_H (n).sh_link).sh_offset);
1066 symp = (ElfW(Sym) *) (NEW_SECTION_H (n).sh_offset + new_base);
1067 symendp = (ElfW(Sym) *) ((byte *)symp + NEW_SECTION_H (n).sh_size);
1068
1069 for (; symp < symendp; symp ++)
1070 if (strcmp ((char *) (symnames + symp->st_name), "_end") == 0
1071 || strcmp ((char *) (symnames + symp->st_name), "_edata") == 0)
1072 memcpy (&symp->st_value, &new_bss_addr, sizeof (new_bss_addr));
1073 }
1074
1075 /* This loop seeks out relocation sections for the data section, so
1076 that it can undo relocations performed by the runtime linker. */
1077 for (n = new_file_h->e_shnum - 1; n; n--)
1078 {
1079 ElfW(Shdr) section = NEW_SECTION_H (n);
1080 switch (section.sh_type) {
1081 default:
1082 break;
1083 case SHT_REL:
1084 case SHT_RELA:
1085 /* This code handles two different size structs, but there should
1086 be no harm in that provided that r_offset is always the first
1087 member. */
1088 nn = section.sh_info;
1089 if (!strcmp (old_section_names + NEW_SECTION_H (nn).sh_name, ".data")
1090 || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name),
1091 ".data1"))
1092 {
1093 ElfW(Addr) offset = NEW_SECTION_H (nn).sh_addr -
1094 NEW_SECTION_H (nn).sh_offset;
1095 caddr_t reloc = old_base + section.sh_offset, end;
1096 for (end = reloc + section.sh_size; reloc < end;
1097 reloc += section.sh_entsize)
1098 {
1099 ElfW(Addr) addr = ((ElfW(Rel) *) reloc)->r_offset - offset;
1100 #ifdef __alpha__
1101 /* The Alpha ELF binutils currently have a bug that
1102 sometimes results in relocs that contain all
1103 zeroes. Work around this for now... */
1104 if (((ElfW(Rel) *) reloc)->r_offset == 0)
1105 continue;
1106 #endif
1107 memcpy (new_base + addr, old_base + addr, sizeof(ElfW(Addr)));
1108 }
1109 }
1110 break;
1111 }
1112 }
1113
1114 #ifdef UNEXEC_USE_MAP_PRIVATE
1115 if (lseek (new_file, 0, SEEK_SET) == -1)
1116 fatal ("Can't rewind (%s): errno %d\n", new_name, errno);
1117
1118 if (write (new_file, new_base, new_file_size) != new_file_size)
1119 fatal ("Can't write (%s): errno %d\n", new_name, errno);
1120 #endif
1121
1122 /* Close the files and make the new file executable. */
1123
1124 if (close (old_file))
1125 fatal ("Can't close (%s): errno %d\n", old_name, errno);
1126
1127 if (close (new_file))
1128 fatal ("Can't close (%s): errno %d\n", new_name, errno);
1129
1130 if (stat (new_name, &stat_buf) == -1)
1131 fatal ("Can't stat (%s): errno %d\n", new_name, errno);
1132
1133 n = umask (777);
1134 umask (n);
1135 stat_buf.st_mode |= 0111 & ~n;
1136 if (chmod (new_name, stat_buf.st_mode) == -1)
1137 fatal ("Can't chmod (%s): errno %d\n", new_name, errno);
1138 }
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