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comparison src/unexsni.c @ 0:376386a54a3c r19-14

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date Mon, 13 Aug 2007 08:45:50 +0200
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1 /* Unexec for Siemens machines running Sinix (modified SVR4).
2 Copyright (C) 1985, 1986, 1987, 1988, 1990, 1992, 1993, 1994, 1995
3 Free Software Foundation, Inc.
4
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.
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 /* Synched up with: FSF 19.31. */
27
28 /*
29 * unexec.c - Convert a running program into an a.out file.
30 *
31 * Author: Spencer W. Thomas
32 * Computer Science Dept.
33 * University of Utah
34 * Date: Tue Mar 2 1982
35 * Modified heavily since then.
36 *
37 * Synopsis:
38 * unexec (new_name, a_name, data_start, bss_start, entry_address)
39 * char *new_name, *a_name;
40 * unsigned data_start, bss_start, entry_address;
41 *
42 * Takes a snapshot of the program and makes an a.out format file in the
43 * file named by the string argument new_name.
44 * If a_name is non-NULL, the symbol table will be taken from the given file.
45 * On some machines, an existing a_name file is required.
46 *
47 * The boundaries within the a.out file may be adjusted with the data_start
48 * and bss_start arguments. Either or both may be given as 0 for defaults.
49 *
50 * Data_start gives the boundary between the text segment and the data
51 * segment of the program. The text segment can contain shared, read-only
52 * program code and literal data, while the data segment is always unshared
53 * and unprotected. Data_start gives the lowest unprotected address.
54 * The value you specify may be rounded down to a suitable boundary
55 * as required by the machine you are using.
56 *
57 * Specifying zero for data_start means the boundary between text and data
58 * should not be the same as when the program was loaded.
59 * If NO_REMAP is defined, the argument data_start is ignored and the
60 * segment boundaries are never changed.
61 *
62 * Bss_start indicates how much of the data segment is to be saved in the
63 * a.out file and restored when the program is executed. It gives the lowest
64 * unsaved address, and is rounded up to a page boundary. The default when 0
65 * is given assumes that the entire data segment is to be stored, including
66 * the previous data and bss as well as any additional storage allocated with
67 * break (2).
68 *
69 * The new file is set up to start at entry_address.
70 *
71 * If you make improvements I'd like to get them too.
72 * harpo!utah-cs!thomas, thomas@Utah-20
73 *
74 */
75
76 /* Even more heavily modified by james@bigtex.cactus.org of Dell Computer Co.
77 * ELF support added.
78 *
79 * Basic theory: the data space of the running process needs to be
80 * dumped to the output file. Normally we would just enlarge the size
81 * of .data, scooting everything down. But we can't do that in ELF,
82 * because there is often something between the .data space and the
83 * .bss space.
84 *
85 * In the temacs dump below, notice that the Global Offset Table
86 * (.got) and the Dynamic link data (.dynamic) come between .data1 and
87 * .bss. It does not work to overlap .data with these fields.
88 *
89 * The solution is to create a new .data segment. This segment is
90 * filled with data from the current process. Since the contents of
91 * various sections refer to sections by index, the new .data segment
92 * is made the last in the table to avoid changing any existing index.
93 */
94
95 /* Modified by wtien@urbana.mcd.mot.com of Motorola Inc.
96 *
97 * The above mechanism does not work if the unexeced ELF file is being
98 * re-layout by other applications (such as `strip'). All the applications
99 * that re-layout the internal of ELF will layout all sections in ascending
100 * order of their file offsets. After the re-layout, the data2 section will
101 * still be the LAST section in the section header vector, but its file offset
102 * is now being pushed far away down, and causes part of it not to be mapped
103 * in (ie. not covered by the load segment entry in PHDR vector), therefore
104 * causes the new binary to fail.
105 *
106 * The solution is to modify the unexec algorithm to insert the new data2
107 * section header right before the new bss section header, so their file
108 * offsets will be in the ascending order. Since some of the section's (all
109 * sections AFTER the bss section) indexes are now changed, we also need to
110 * modify some fields to make them point to the right sections. This is done
111 * by macro PATCH_INDEX. All the fields that need to be patched are:
112 *
113 * 1. ELF header e_shstrndx field.
114 * 2. section header sh_link and sh_info field.
115 * 3. symbol table entry st_shndx field.
116 */
117
118 /*
119 * New modifications for Siemens Nixdorf's MIPS-based machines.
120 * Marco.Walther@mch.sni.de
121 *
122 * The problem: Before the bss segment we have a so called sbss segment
123 * (small bss) and maybe an sdata segment. These segments
124 * must also be handled correct.
125 *
126 * /home1/marco/emacs/emacs-19.22/src
127 * dump -hv temacs
128 *
129 * temacs:
130 *
131 * **** SECTION HEADER TABLE ****
132 * [No] Type Flags Addr Offset Size Name
133 * Link Info Adralgn Entsize
134 *
135 * [1] PBIT -A-- 0x4000f4 0xf4 0x13 .interp
136 * 0 0 0x1 0
137 *
138 * [2] REGI -A-- 0x400108 0x108 0x18 .reginfo
139 * 0 0 0x4 0x18
140 *
141 * [3] DYNM -A-- 0x400120 0x120 0xb8 .dynamic
142 * 6 0 0x4 0x8
143 *
144 * [4] HASH -A-- 0x4001d8 0x1d8 0x8a0 .hash
145 * 5 0 0x4 0x4
146 *
147 * [5] DYNS -A-- 0x400a78 0xa78 0x11f0 .dynsym
148 * 6 2 0x4 0x10
149 *
150 * [6] STRT -A-- 0x401c68 0x1c68 0xbf9 .dynstr
151 * 0 0 0x1 0
152 *
153 * [7] REL -A-- 0x402864 0x2864 0x18 .rel.dyn
154 * 5 14 0x4 0x8
155 *
156 * [8] PBIT -AI- 0x402880 0x2880 0x60 .init
157 * 0 0 0x10 0x1
158 *
159 * [9] PBIT -AI- 0x4028e0 0x28e0 0x1234 .plt
160 * 0 0 0x4 0x4
161 *
162 * [10] PBIT -AI- 0x403b20 0x3b20 0xee400 .text
163 * 0 0 0x20 0x1
164 *
165 * [11] PBIT -AI- 0x4f1f20 0xf1f20 0x60 .fini
166 * 0 0 0x10 0x1
167 *
168 * [12] PBIT -A-- 0x4f1f80 0xf1f80 0xd90 .rdata
169 * 0 0 0x10 0x1
170 *
171 * [13] PBIT -A-- 0x4f2d10 0xf2d10 0x17e0 .rodata
172 * 0 0 0x10 0x1
173 *
174 * [14] PBIT WA-- 0x5344f0 0xf44f0 0x4b3e4 .data <<<<<
175 * 0 0 0x10 0x1
176 *
177 * [15] PBIT WA-G 0x57f8d4 0x13f8d4 0x2a84 .got
178 * 0 0 0x4 0x4
179 *
180 * [16] PBIT WA-G 0x582360 0x142360 0x10 .sdata <<<<<
181 * 0 0 0x10 0x1
182 *
183 * [17] NOBI WA-G 0x582370 0x142370 0xb84 .sbss <<<<<
184 * 0 0 0x4 0
185 *
186 * [18] NOBI WA-- 0x582f00 0x142370 0x27ec0 .bss <<<<<
187 * 0 0 0x10 0x1
188 *
189 * [19] SYMT ---- 0 0x142370 0x10e40 .symtab
190 * 20 1108 0x4 0x10
191 *
192 * [20] STRT ---- 0 0x1531b0 0xed9e .strtab
193 * 0 0 0x1 0
194 *
195 * [21] STRT ---- 0 0x161f4e 0xb5 .shstrtab
196 * 0 0 0x1 0
197 *
198 * [22] PBIT ---- 0 0x162003 0x28e2a .comment
199 * 0 0 0x1 0x1
200 *
201 * [23] PBIT ---- 0 0x18ae2d 0x592 .debug
202 * 0 0 0x1 0
203 *
204 * [24] PBIT ---- 0 0x18b3bf 0x80 .line
205 * 0 0 0x1 0
206 *
207 * [25] MDBG ---- 0 0x18b440 0x60 .mdebug
208 * 0 0 0x4 0
209 *
210 *
211 * dump -hv emacs
212 *
213 * emacs:
214 *
215 * **** SECTION HEADER TABLE ****
216 * [No] Type Flags Addr Offset Size Name
217 * Link Info Adralgn Entsize
218 *
219 * [1] PBIT -A-- 0x4000f4 0xf4 0x13 .interp
220 * 0 0 0x1 0
221 *
222 * [2] REGI -A-- 0x400108 0x108 0x18 .reginfo
223 * 0 0 0x4 0x18
224 *
225 * [3] DYNM -A-- 0x400120 0x120 0xb8 .dynamic
226 * 6 0 0x4 0x8
227 *
228 * [4] HASH -A-- 0x4001d8 0x1d8 0x8a0 .hash
229 * 5 0 0x4 0x4
230 *
231 * [5] DYNS -A-- 0x400a78 0xa78 0x11f0 .dynsym
232 * 6 2 0x4 0x10
233 *
234 * [6] STRT -A-- 0x401c68 0x1c68 0xbf9 .dynstr
235 * 0 0 0x1 0
236 *
237 * [7] REL -A-- 0x402864 0x2864 0x18 .rel.dyn
238 * 5 14 0x4 0x8
239 *
240 * [8] PBIT -AI- 0x402880 0x2880 0x60 .init
241 * 0 0 0x10 0x1
242 *
243 * [9] PBIT -AI- 0x4028e0 0x28e0 0x1234 .plt
244 * 0 0 0x4 0x4
245 *
246 * [10] PBIT -AI- 0x403b20 0x3b20 0xee400 .text
247 * 0 0 0x20 0x1
248 *
249 * [11] PBIT -AI- 0x4f1f20 0xf1f20 0x60 .fini
250 * 0 0 0x10 0x1
251 *
252 * [12] PBIT -A-- 0x4f1f80 0xf1f80 0xd90 .rdata
253 * 0 0 0x10 0x1
254 *
255 * [13] PBIT -A-- 0x4f2d10 0xf2d10 0x17e0 .rodata
256 * 0 0 0x10 0x1
257 *
258 * [14] PBIT WA-- 0x5344f0 0xf44f0 0x4b3e4 .data <<<<<
259 * 0 0 0x10 0x1
260 *
261 * [15] PBIT WA-G 0x57f8d4 0x13f8d4 0x2a84 .got
262 * 0 0 0x4 0x4
263 *
264 * [16] PBIT WA-G 0x582360 0x142360 0xb94 .sdata <<<<<
265 * 0 0 0x10 0x1
266 *
267 * [17] PBIT WA-- 0x582f00 0x142f00 0x94100 .data <<<<<
268 * 0 0 0x10 0x1
269 *
270 * [18] NOBI WA-G 0x617000 0x1d7000 0 .sbss <<<<<
271 * 0 0 0x4 0
272 *
273 * [19] NOBI WA-- 0x617000 0x1d7000 0 .bss <<<<<
274 * 0 0 0x4 0x1
275 *
276 * [20] SYMT ---- 0 0x1d7000 0x10e40 .symtab
277 * 21 1109 0x4 0x10
278 *
279 * [21] STRT ---- 0 0x1e7e40 0xed9e .strtab
280 * 0 0 0x1 0
281 *
282 * [22] STRT ---- 0 0x1f6bde 0xb5 .shstrtab
283 * 0 0 0x1 0
284 *
285 * [23] PBIT ---- 0 0x1f6c93 0x28e2a .comment
286 * 0 0 0x1 0x1
287 *
288 * [24] PBIT ---- 0 0x21fabd 0x592 .debug
289 * 0 0 0x1 0
290 *
291 * [25] PBIT ---- 0 0x22004f 0x80 .line
292 * 0 0 0x1 0
293 *
294 * [26] MDBG ---- 0 0x2200d0 0x60 .mdebug
295 * 0 0 0x4 0
296 *
297 */
298
299 #include <sys/types.h>
300 #include <stdio.h>
301 #include <sys/stat.h>
302 #include <memory.h>
303 #include <string.h>
304 #include <errno.h>
305 #include <unistd.h>
306 #include <fcntl.h>
307 #include <elf.h>
308 #include <sys/mman.h>
309
310 #ifndef emacs
311 #define fatal(a, b, c) fprintf(stderr, a, b, c), exit(1)
312 #else
313 extern void fatal(char *, ...);
314 #endif
315
316 /* Get the address of a particular section or program header entry,
317 * accounting for the size of the entries.
318 */
319
320 #define OLD_SECTION_H(n) \
321 (*(Elf32_Shdr *) ((byte *) old_section_h + old_file_h->e_shentsize * (n)))
322 #define NEW_SECTION_H(n) \
323 (*(Elf32_Shdr *) ((byte *) new_section_h + new_file_h->e_shentsize * (n)))
324 #define OLD_PROGRAM_H(n) \
325 (*(Elf32_Phdr *) ((byte *) old_program_h + old_file_h->e_phentsize * (n)))
326 #define NEW_PROGRAM_H(n) \
327 (*(Elf32_Phdr *) ((byte *) new_program_h + new_file_h->e_phentsize * (n)))
328
329 #define PATCH_INDEX(n) \
330 do { \
331 if ((n) >= old_sbss_index) \
332 (n) += 1 + (old_sdata_index ? 0 : 1); } while (0)
333
334 typedef unsigned char byte;
335
336 /* Round X up to a multiple of Y. */
337
338 int
339 round_up (x, y)
340 int x, y;
341 {
342 int rem = x % y;
343 if (rem == 0)
344 return x;
345 return x - rem + y;
346 }
347
348 /* ****************************************************************
349 * unexec
350 *
351 * driving logic.
352 *
353 * In ELF, this works by replacing the old .bss section with a new
354 * .data section, and inserting an empty .bss immediately afterwards.
355 *
356 */
357 void
358 unexec (new_name, old_name, data_start, bss_start, entry_address)
359 char *new_name, *old_name;
360 unsigned data_start, bss_start, entry_address;
361 {
362 extern unsigned int bss_end;
363 int new_file, old_file, new_file_size;
364
365 /* Pointers to the base of the image of the two files. */
366 caddr_t old_base, new_base;
367
368 /* Pointers to the file, program and section headers for the old and new
369 * files.
370 */
371 Elf32_Ehdr *old_file_h, *new_file_h;
372 Elf32_Phdr *old_program_h, *new_program_h;
373 Elf32_Shdr *old_section_h, *new_section_h;
374
375 /* Point to the section name table in the old file */
376 char *old_section_names;
377
378 Elf32_Addr old_bss_addr, new_bss_addr;
379 Elf32_Addr old_sbss_addr;
380 Elf32_Word old_bss_size, new_data2_size;
381 Elf32_Word old_sbss_size, new_data3_size;
382 Elf32_Off new_data2_offset;
383 Elf32_Off new_data3_offset;
384 Elf32_Addr new_data2_addr;
385 Elf32_Addr new_data3_addr;
386
387 Elf32_Word old_sdata_size, new_sdata_size;
388 int old_sdata_index = 0;
389
390 int n, nn, old_data_index, new_data2_align;
391 int old_bss_index;
392 int old_sbss_index;
393 int old_bss_padding;
394 struct stat stat_buf;
395
396 /* Open the old file & map it into the address space. */
397
398 old_file = open (old_name, O_RDONLY);
399
400 if (old_file < 0)
401 fatal ("Can't open %s for reading: errno %d\n", old_name, errno);
402
403 if (fstat (old_file, &stat_buf) == -1)
404 fatal ("Can't fstat(%s): errno %d\n", old_name, errno);
405
406 old_base = mmap (0, stat_buf.st_size, PROT_READ, MAP_SHARED, old_file, 0);
407
408 if (old_base == (caddr_t) -1)
409 fatal ("Can't mmap(%s): errno %d\n", old_name, errno);
410
411 #ifdef DEBUG
412 fprintf (stderr, "mmap(%s, %x) -> %x\n", old_name, stat_buf.st_size,
413 old_base);
414 #endif
415
416 /* Get pointers to headers & section names */
417
418 old_file_h = (Elf32_Ehdr *) old_base;
419 old_program_h = (Elf32_Phdr *) ((byte *) old_base + old_file_h->e_phoff);
420 old_section_h = (Elf32_Shdr *) ((byte *) old_base + old_file_h->e_shoff);
421 old_section_names = (char *) old_base
422 + OLD_SECTION_H(old_file_h->e_shstrndx).sh_offset;
423
424 /* Find the old .sbss section.
425 */
426
427 for (old_sbss_index = 1; old_sbss_index < old_file_h->e_shnum;
428 old_sbss_index++)
429 {
430 #ifdef DEBUG
431 fprintf (stderr, "Looking for .sbss - found %s\n",
432 old_section_names + OLD_SECTION_H(old_sbss_index).sh_name);
433 #endif
434 if (!strcmp (old_section_names + OLD_SECTION_H(old_sbss_index).sh_name,
435 ".sbss"))
436 break;
437 }
438 if (old_sbss_index == old_file_h->e_shnum)
439 fatal ("Can't find .sbss in %s.\n", old_name, 0);
440
441 if (!strcmp(old_section_names + OLD_SECTION_H(old_sbss_index - 1).sh_name,
442 ".sdata"))
443 {
444 old_sdata_index = old_sbss_index - 1;
445 }
446
447
448 /* Find the old .bss section.
449 */
450
451 for (old_bss_index = 1; old_bss_index < old_file_h->e_shnum; old_bss_index++)
452 {
453 #ifdef DEBUG
454 fprintf (stderr, "Looking for .bss - found %s\n",
455 old_section_names + OLD_SECTION_H(old_bss_index).sh_name);
456 #endif
457 if (!strcmp (old_section_names + OLD_SECTION_H(old_bss_index).sh_name,
458 ".bss"))
459 break;
460 }
461 if (old_bss_index == old_file_h->e_shnum)
462 fatal ("Can't find .bss in %s.\n", old_name, 0);
463
464 if (old_sbss_index != (old_bss_index - 1))
465 fatal (".sbss should come immediately before .bss in %s.\n", old_name, 0);
466
467 /* Figure out parameters of the new data3 and data2 sections.
468 * Change the sbss and bss sections.
469 */
470
471 old_bss_addr = OLD_SECTION_H(old_bss_index).sh_addr;
472 old_bss_size = OLD_SECTION_H(old_bss_index).sh_size;
473
474 old_sbss_addr = OLD_SECTION_H(old_sbss_index).sh_addr;
475 old_sbss_size = OLD_SECTION_H(old_sbss_index).sh_size;
476
477 if (old_sdata_index)
478 {
479 old_sdata_size = OLD_SECTION_H(old_sdata_index).sh_size;
480 }
481
482 #if defined(emacs) || !defined(DEBUG)
483 bss_end = (unsigned int) sbrk (0);
484 new_bss_addr = (Elf32_Addr) bss_end;
485 #else
486 new_bss_addr = old_bss_addr + old_bss_size + 0x1234;
487 #endif
488 if (old_sdata_index)
489 {
490 new_sdata_size = OLD_SECTION_H(old_sbss_index).sh_offset -
491 OLD_SECTION_H(old_sdata_index).sh_offset + old_sbss_size;
492 }
493
494 new_data3_addr = old_sbss_addr;
495 new_data3_size = old_sbss_size;
496 new_data3_offset = OLD_SECTION_H(old_sbss_index).sh_offset;
497
498 new_data2_addr = old_bss_addr;
499 new_data2_size = new_bss_addr - old_bss_addr;
500 new_data2_align = (new_data3_offset + old_sbss_size) %
501 OLD_SECTION_H(old_bss_index).sh_addralign;
502 new_data2_align = new_data2_align ?
503 OLD_SECTION_H(old_bss_index).sh_addralign - new_data2_align :
504 0;
505 new_data2_offset = new_data3_offset + old_sbss_size + new_data2_align;
506
507 old_bss_padding = OLD_SECTION_H(old_bss_index).sh_offset -
508 OLD_SECTION_H(old_sbss_index).sh_offset;
509 #ifdef DEBUG
510 fprintf (stderr, "old_bss_index %d\n", old_bss_index);
511 fprintf (stderr, "old_bss_addr %x\n", old_bss_addr);
512 fprintf (stderr, "old_bss_size %x\n", old_bss_size);
513 fprintf (stderr, "new_bss_addr %x\n", new_bss_addr);
514 fprintf (stderr, "new_data2_addr %x\n", new_data2_addr);
515 fprintf (stderr, "new_data2_size %x\n", new_data2_size);
516 fprintf (stderr, "new_data2_offset %x\n", new_data2_offset);
517 fprintf (stderr, "old_sbss_index %d\n", old_sbss_index);
518 fprintf (stderr, "old_sbss_addr %x\n", old_sbss_addr);
519 fprintf (stderr, "old_sbss_size %x\n", old_sbss_size);
520 if (old_sdata_index)
521 {
522 fprintf (stderr, "old_sdata_size %x\n", old_sdata_size);
523 fprintf (stderr, "new_sdata_size %x\n", new_sdata_size);
524 }
525 else
526 {
527 fprintf (stderr, "new_data3_addr %x\n", new_data3_addr);
528 fprintf (stderr, "new_data3_size %x\n", new_data3_size);
529 fprintf (stderr, "new_data3_offset %x\n", new_data3_offset);
530 }
531 #endif
532
533 if ((unsigned) new_bss_addr < (unsigned) old_bss_addr + old_bss_size)
534 fatal (".bss shrank when undumping???\n", 0, 0);
535
536 /* Set the output file to the right size and mmap(2) it. Set
537 * pointers to various interesting objects. stat_buf still has
538 * old_file data.
539 */
540
541 new_file = open (new_name, O_RDWR | O_CREAT, 0666);
542 if (new_file < 0)
543 fatal ("Can't creat(%s): errno %d\n", new_name, errno);
544
545 new_file_size = stat_buf.st_size +
546 ((1 + (old_sdata_index ? 0 : 1)) * old_file_h->e_shentsize) +
547 new_data2_size + new_data3_size + new_data2_align;
548
549 if (ftruncate (new_file, new_file_size))
550 fatal ("Can't ftruncate(%s): errno %d\n", new_name, errno);
551
552 new_base = mmap (0, new_file_size, PROT_READ | PROT_WRITE, MAP_SHARED,
553 new_file, 0);
554
555 if (new_base == (caddr_t) -1)
556 fatal ("Can't mmap(%s): errno %d\n", new_name, errno);
557
558 new_file_h = (Elf32_Ehdr *) new_base;
559 new_program_h = (Elf32_Phdr *) ((byte *) new_base + old_file_h->e_phoff);
560 new_section_h = (Elf32_Shdr *) ((byte *) new_base +
561 old_file_h->e_shoff +
562 new_data2_size +
563 new_data2_align +
564 new_data3_size);
565
566 /* Make our new file, program and section headers as copies of the
567 * originals.
568 */
569
570 memcpy (new_file_h, old_file_h, old_file_h->e_ehsize);
571 memcpy (new_program_h, old_program_h,
572 old_file_h->e_phnum * old_file_h->e_phentsize);
573
574 /* Modify the e_shstrndx if necessary. */
575 PATCH_INDEX (new_file_h->e_shstrndx);
576
577 /* Fix up file header. We'll add one section. Section header is
578 * further away now.
579 */
580
581 new_file_h->e_shoff += new_data2_size + new_data2_align + new_data3_size;
582 new_file_h->e_shnum += 1 + (old_sdata_index ? 0 : 1);
583
584 #ifdef DEBUG
585 fprintf (stderr, "Old section offset %x\n", old_file_h->e_shoff);
586 fprintf (stderr, "Old section count %d\n", old_file_h->e_shnum);
587 fprintf (stderr, "New section offset %x\n", new_file_h->e_shoff);
588 fprintf (stderr, "New section count %d\n", new_file_h->e_shnum);
589 #endif
590
591 /* Fix up a new program header. Extend the writable data segment so
592 * that the bss area is covered too. Find that segment by looking
593 * for a segment that ends just before the .bss area. Make sure
594 * that no segments are above the new .data2. Put a loop at the end
595 * to adjust the offset and address of any segment that is above
596 * data2, just in case we decide to allow this later.
597 */
598
599 for (n = new_file_h->e_phnum - 1; n >= 0; n--)
600 {
601 /* Compute maximum of all requirements for alignment of section. */
602 int alignment = (NEW_PROGRAM_H (n)).p_align;
603 if ((OLD_SECTION_H (old_bss_index)).sh_addralign > alignment)
604 alignment = OLD_SECTION_H (old_bss_index).sh_addralign;
605
606 if ((OLD_SECTION_H (old_sbss_index)).sh_addralign > alignment)
607 alignment = OLD_SECTION_H (old_sbss_index).sh_addralign;
608
609 /* Supposedly this condition is okay for the SGI. */
610 #if 0
611 if (NEW_PROGRAM_H(n).p_vaddr + NEW_PROGRAM_H(n).p_filesz > old_bss_addr)
612 fatal ("Program segment above .bss in %s\n", old_name, 0);
613 #endif
614
615 if (NEW_PROGRAM_H(n).p_type == PT_LOAD
616 && (round_up ((NEW_PROGRAM_H (n)).p_vaddr
617 + (NEW_PROGRAM_H (n)).p_filesz,
618 alignment)
619 == round_up (old_bss_addr, alignment)))
620 break;
621 }
622 if (n < 0)
623 fatal ("Couldn't find segment next to .bss in %s\n", old_name, 0);
624
625 NEW_PROGRAM_H(n).p_filesz += new_data2_size + new_data2_align +
626 new_data3_size;
627 NEW_PROGRAM_H(n).p_memsz = NEW_PROGRAM_H(n).p_filesz;
628
629 #if 1 /* Maybe allow section after data2 - does this ever happen? */
630 for (n = new_file_h->e_phnum - 1; n >= 0; n--)
631 {
632 if (NEW_PROGRAM_H(n).p_vaddr
633 && NEW_PROGRAM_H(n).p_vaddr >= new_data3_addr)
634 NEW_PROGRAM_H(n).p_vaddr += new_data2_size - old_bss_size +
635 new_data3_size - old_sbss_size;
636
637 if (NEW_PROGRAM_H(n).p_offset >= new_data3_offset)
638 NEW_PROGRAM_H(n).p_offset += new_data2_size + new_data2_align +
639 new_data3_size;
640 }
641 #endif
642
643 /* Fix up section headers based on new .data2 section. Any section
644 * whose offset or virtual address is after the new .data2 section
645 * gets its value adjusted. .bss size becomes zero and new address
646 * is set. data2 section header gets added by copying the existing
647 * .data header and modifying the offset, address and size.
648 */
649 for (old_data_index = 1; old_data_index < old_file_h->e_shnum;
650 old_data_index++)
651 if (!strcmp (old_section_names + OLD_SECTION_H(old_data_index).sh_name,
652 ".data"))
653 break;
654 if (old_data_index == old_file_h->e_shnum)
655 fatal ("Can't find .data in %s.\n", old_name, 0);
656
657 /* Walk through all section headers, insert the new data2 section right
658 before the new bss section. */
659 for (n = 1, nn = 1; n < old_file_h->e_shnum; n++, nn++)
660 {
661 caddr_t src;
662
663 if (n == old_sbss_index)
664
665 /* If it is sbss section, insert the new data3 section before it. */
666 {
667 /* Steal the data section header for this data3 section. */
668 if (!old_sdata_index)
669 {
670 memcpy (&NEW_SECTION_H(nn), &OLD_SECTION_H(old_data_index),
671 new_file_h->e_shentsize);
672
673 NEW_SECTION_H(nn).sh_addr = new_data3_addr;
674 NEW_SECTION_H(nn).sh_offset = new_data3_offset;
675 NEW_SECTION_H(nn).sh_size = new_data3_size;
676 NEW_SECTION_H(nn).sh_flags = OLD_SECTION_H(n).sh_flags;
677 /* Use the sbss section's alignment. This will assure that the
678 new data3 section always be placed in the same spot as the old
679 sbss section by any other application. */
680 NEW_SECTION_H(nn).sh_addralign = OLD_SECTION_H(n).sh_addralign;
681
682 /* Now copy over what we have in the memory now. */
683 memcpy (NEW_SECTION_H(nn).sh_offset + new_base,
684 (caddr_t) OLD_SECTION_H(n).sh_addr,
685 new_data3_size);
686 /* the new .data2 section should also come before the
687 * new .sbss section */
688 nn += 2;
689 }
690 else
691 {
692 /* We always have a .sdata section: append the contents of the
693 * old .sbss section.
694 */
695 memcpy (new_data3_offset + new_base,
696 (caddr_t) OLD_SECTION_H(n).sh_addr,
697 new_data3_size);
698 nn ++;
699 }
700 }
701 else if (n == old_bss_index)
702
703 /* If it is bss section, insert the new data2 section before it. */
704 {
705 Elf32_Word tmp_align;
706 Elf32_Addr tmp_addr;
707
708 tmp_align = OLD_SECTION_H(n).sh_addralign;
709 tmp_addr = OLD_SECTION_H(n).sh_addr;
710
711 nn -= 2;
712 /* Steal the data section header for this data2 section. */
713 memcpy (&NEW_SECTION_H(nn), &OLD_SECTION_H(old_data_index),
714 new_file_h->e_shentsize);
715
716 NEW_SECTION_H(nn).sh_addr = new_data2_addr;
717 NEW_SECTION_H(nn).sh_offset = new_data2_offset;
718 NEW_SECTION_H(nn).sh_size = new_data2_size;
719 /* Use the bss section's alignment. This will assure that the
720 new data2 section always be placed in the same spot as the old
721 bss section by any other application. */
722 NEW_SECTION_H(nn).sh_addralign = tmp_align;
723
724 /* Now copy over what we have in the memory now. */
725 memcpy (NEW_SECTION_H(nn).sh_offset + new_base,
726 (caddr_t) tmp_addr, new_data2_size);
727 nn += 2;
728 }
729
730 memcpy (&NEW_SECTION_H(nn), &OLD_SECTION_H(n),
731 old_file_h->e_shentsize);
732
733 if (old_sdata_index && n == old_sdata_index)
734 /* The old .sdata section has now a new size */
735 NEW_SECTION_H(nn).sh_size = new_sdata_size;
736
737 /* The new bss section's size is zero, and its file offset and virtual
738 address should be off by NEW_DATA2_SIZE. */
739 if (n == old_sbss_index)
740 {
741 /* NN should be `old_sbss_index + 2' at this point. */
742 NEW_SECTION_H(nn).sh_offset += new_data2_size + new_data2_align +
743 new_data3_size;
744 NEW_SECTION_H(nn).sh_addr += new_data2_size + new_data2_align +
745 new_data3_size;
746 /* Let the new bss section address alignment be the same as the
747 section address alignment followed the old bss section, so
748 this section will be placed in exactly the same place. */
749 NEW_SECTION_H(nn).sh_addralign =
750 OLD_SECTION_H(nn + (old_sdata_index ? 1 : 0)).sh_addralign;
751 NEW_SECTION_H(nn).sh_size = 0;
752 }
753 else if (n == old_bss_index)
754 {
755 /* NN should be `old_bss_index + 2' at this point. */
756 NEW_SECTION_H(nn).sh_offset += new_data2_size + new_data2_align +
757 new_data3_size - old_bss_padding;
758 NEW_SECTION_H(nn).sh_addr += new_data2_size;
759 /* Let the new bss section address alignment be the same as the
760 section address alignment followed the old bss section, so
761 this section will be placed in exactly the same place. */
762 NEW_SECTION_H(nn).sh_addralign =
763 OLD_SECTION_H((nn - (old_sdata_index ? 0 : 1))).sh_addralign;
764 NEW_SECTION_H(nn).sh_size = 0;
765 }
766 /* Any section that was original placed AFTER the bss section should now
767 be off by NEW_DATA2_SIZE. */
768 else if (NEW_SECTION_H(nn).sh_offset >= new_data3_offset)
769 NEW_SECTION_H(nn).sh_offset += new_data2_size +
770 new_data2_align +
771 new_data3_size -
772 old_bss_padding;
773
774 /* If any section hdr refers to the section after the new .data
775 section, make it refer to next one because we have inserted
776 a new section in between. */
777
778 PATCH_INDEX(NEW_SECTION_H(nn).sh_link);
779 PATCH_INDEX(NEW_SECTION_H(nn).sh_info);
780
781 /* Now, start to copy the content of sections. */
782 if (NEW_SECTION_H(nn).sh_type == SHT_NULL
783 || NEW_SECTION_H(nn).sh_type == SHT_NOBITS)
784 continue;
785
786 /* Write out the sections. .data, .data1 and .sdata get copied from
787 * the current process instead of the old file.
788 */
789 if (!strcmp (old_section_names + OLD_SECTION_H(n).sh_name, ".data") ||
790 !strcmp (old_section_names + OLD_SECTION_H(n).sh_name, ".data1") ||
791 (old_sdata_index && (n == old_sdata_index)))
792 src = (caddr_t) OLD_SECTION_H(n).sh_addr;
793 else
794 src = old_base + OLD_SECTION_H(n).sh_offset;
795
796 memcpy (NEW_SECTION_H(nn).sh_offset + new_base, src,
797 ((n == old_sdata_index) ?
798 old_sdata_size :
799 NEW_SECTION_H(nn).sh_size));
800
801 /* If it is the symbol table, its st_shndx field needs to be patched. */
802 if (NEW_SECTION_H(nn).sh_type == SHT_SYMTAB
803 || NEW_SECTION_H(nn).sh_type == SHT_DYNSYM)
804 {
805 Elf32_Shdr *spt = &NEW_SECTION_H(nn);
806 unsigned int num = spt->sh_size / spt->sh_entsize;
807 Elf32_Sym * sym = (Elf32_Sym *) (NEW_SECTION_H(nn).sh_offset +
808 new_base);
809 for (; num--; sym++)
810 {
811 if ((sym->st_shndx == SHN_UNDEF)
812 || (sym->st_shndx == SHN_ABS)
813 || (sym->st_shndx == SHN_COMMON))
814 continue;
815
816 PATCH_INDEX(sym->st_shndx);
817 }
818 }
819 }
820
821 /* Close the files and make the new file executable */
822
823 if (close (old_file))
824 fatal ("Can't close(%s): errno %d\n", old_name, errno);
825
826 if (close (new_file))
827 fatal ("Can't close(%s): errno %d\n", new_name, errno);
828
829 if (stat (new_name, &stat_buf) == -1)
830 fatal ("Can't stat(%s): errno %d\n", new_name, errno);
831
832 n = umask (777);
833 umask (n);
834 stat_buf.st_mode |= 0111 & ~n;
835 if (chmod (new_name, stat_buf.st_mode) == -1)
836 fatal ("Can't chmod(%s): errno %d\n", new_name, errno);
837 }