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comparison src/unexelfsgi.c @ 446:1ccc32a20af4 r21-2-38

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Import from CVS: tag r21-2-38
author cvs
date Mon, 13 Aug 2007 11:37:21 +0200
parents 576fb035e263
children 3078fd1074e8
comparison
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445:34f3776fcf0e 446:1ccc32a20af4
1 /* Copyright (C) 1985, 1986, 1987, 1988, 1990, 1992, 1999, 2000 1 /* Copyright (C) 1985, 1986, 1987, 1988, 1990, 1992, 1999, 2000
2 Free Software Foundation, Inc. 2 Free Software Foundation, Inc.
3 3
4 This file is part of XEmacs. 4 This file is part of XEmacs.
5 5
6 XEmacs is free software; you can redistribute it and/or modify 6 XEmacs is free software; you can redistribute it and/or modify it
7 it under the terms of the GNU General Public License as published by 7 under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option) 8 the Free Software Foundation; either version 2, or (at your option)
9 any later version. 9 any later version.
10 10
11 GNU Emacs is distributed in the hope that it will be useful, 11 GNU Emacs is distributed in the hope that it will be useful, but
12 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 GNU General Public License for more details. 14 General Public License for more details.
15 15
16 You should have received a copy of the GNU General Public License 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 17 along with GNU Emacs; see the file COPYING. If not, write to the
18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330, 18 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. 19 Boston, MA 02111-1307, USA.
20 20
21 In other words, you are welcome to use, share and improve this program. 21 In other words, you are welcome to use, share and improve this
22 You are forbidden to forbid anyone else to use, share and improve 22 program. You are forbidden to forbid anyone else to use, share and
23 what you give them. Help stamp out software-hoarding! */ 23 improve what you give them. Help stamp out software-hoarding! */
24 24
25 /* 2000-10-31: Martin Buchholz
26
27 I noticed that xemacs on Irix 6.5 could not write to stderr, e.g.
28 (external-debugging-output "\n")
29 would produce NO output.
30 temacs worked fine, so this was clearly a dumping problem.
31
32 So I copied over the latest available unexelf.c from FSF Emacs,
33 and installed it as unexelfsgi.c in XEmacs.
34 In addition, I converted it to "Clean C", resulting in this file.
35 */
36 25
37 /* 26 /*
38 * unexec.c - Convert a running program into an a.out file. 27 * unexec.c - Convert a running program into an a.out file.
39 * 28 *
40 * Author: Spencer W. Thomas 29 * Author: Spencer W. Thomas
42 * University of Utah 31 * University of Utah
43 * Date: Tue Mar 2 1982 32 * Date: Tue Mar 2 1982
44 * Modified heavily since then. 33 * Modified heavily since then.
45 * 34 *
46 * Synopsis: 35 * Synopsis:
47 * unexec (new_name, old_name, data_start, bss_start, entry_address) 36 * void
48 * char *new_name, *old_name; 37 * unexec (char *new_name,
49 * unsigned data_start, bss_start, entry_address; 38 * char *old_name,
50 * 39 * uintptr_t data_start,
51 * Takes a snapshot of the program and makes an a.out format file in the 40 * uintptr_t bss_start,
52 * file named by the string argument new_name. 41 * uintptr_t entry_address)
53 * If old_name is non-NULL, the symbol table will be taken from the given file. 42 *
54 * On some machines, an existing old_name file is required. 43 * The basic idea is that we start with an ELF file which contains
55 * 44 * .bss (uninitialized global data) section which is normally not in
56 * The boundaries within the a.out file may be adjusted with the data_start 45 * the file. As we load lisp the variables, which were first set to 0,
57 * and bss_start arguments. Either or both may be given as 0 for defaults. 46 * will change their values. We want to save those changed values into
58 * 47 * another ELF file, which will become a new xemacs image. To do this,
59 * Data_start gives the boundary between the text segment and the data 48 * we need to change several structures in the ELF file.
60 * segment of the program. The text segment can contain shared, read-only 49 *
61 * program code and literal data, while the data segment is always unshared 50 * First of all, we need to change the programm header which tells
62 * and unprotected. Data_start gives the lowest unprotected address. 51 * the linker how to load stuff into memory so that data will come
63 * The value you specify may be rounded down to a suitable boundary 52 * from the file and not from the /dev/zero. To do this, we find the
64 * as required by the machine you are using. 53 * segment, which is marked as loadable (type PT_LOAD) and which
65 * 54 * covers the old .bss section. We will next change the filesz and
66 * Bss_start indicates how much of the data segment is to be saved in the 55 * memsz for that segment to extend over the new data section.
67 * a.out file and restored when the program is executed. It gives the lowest 56 *
68 * unsaved address, and is rounded up to a page boundary. The default when 0 57 * Next we have to make sure that section header for the stuff which
69 * is given assumes that the entire data segment is to be stored, including 58 * used to be uninitialized is changed to be initialized and to come
70 * the previous data and bss as well as any additional storage allocated with 59 * from the file. To do this, we change the size and the type of the old
71 * break (2). 60 * .bss section (and all other section of the type SHT_NOBITS) to cover the
72 * 61 * new section and to be of type SHT_PROCBITS.
73 * The new file is set up to start at entry_address. 62 *
74 * 63 * We also insert a new SHT_NOBITS section to keep some tools, which expect
75 */ 64 * .bss happy.
76 65 *
77 /* Even more heavily modified by james@bigtex.cactus.org of Dell Computer Co. 66 * Finally we need to patch up some references to the section
78 * ELF support added. 67 * indexes since we change the order and undo the relocation info to
79 * 68 * be the same as it was "before" because we actually used the data
80 * Basic theory: the data space of the running process needs to be 69 * from the memory which were changed by the run-time linker.
81 * dumped to the output file. Normally we would just enlarge the size
82 * of .data, scooting everything down. But we can't do that in ELF,
83 * because there is often something between the .data space and the
84 * .bss space.
85 *
86 * In the temacs dump below, notice that the Global Offset Table
87 * (.got) and the Dynamic link data (.dynamic) come between .data1 and
88 * .bss. It does not work to overlap .data with these fields.
89 *
90 * The solution is to create a new .data segment. This segment is
91 * filled with data from the current process. Since the contents of
92 * various sections refer to sections by index, the new .data segment
93 * is made the last in the table to avoid changing any existing index.
94
95 * This is an example of how the section headers are changed. "Addr"
96 * is a process virtual address. "Offset" is a file offset.
97
98 raid:/nfs/raid/src/dist-18.56/src> dump -h temacs
99
100 temacs:
101
102 **** SECTION HEADER TABLE ****
103 [No] Type Flags Addr Offset Size Name
104 Link Info Adralgn Entsize
105
106 [1] 1 2 0x80480d4 0xd4 0x13 .interp
107 0 0 0x1 0
108
109 [2] 5 2 0x80480e8 0xe8 0x388 .hash
110 3 0 0x4 0x4
111
112 [3] 11 2 0x8048470 0x470 0x7f0 .dynsym
113 4 1 0x4 0x10
114
115 [4] 3 2 0x8048c60 0xc60 0x3ad .dynstr
116 0 0 0x1 0
117
118 [5] 9 2 0x8049010 0x1010 0x338 .rel.plt
119 3 7 0x4 0x8
120
121 [6] 1 6 0x8049348 0x1348 0x3 .init
122 0 0 0x4 0
123
124 [7] 1 6 0x804934c 0x134c 0x680 .plt
125 0 0 0x4 0x4
126
127 [8] 1 6 0x80499cc 0x19cc 0x3c56f .text
128 0 0 0x4 0
129
130 [9] 1 6 0x8085f3c 0x3df3c 0x3 .fini
131 0 0 0x4 0
132
133 [10] 1 2 0x8085f40 0x3df40 0x69c .rodata
134 0 0 0x4 0
135
136 [11] 1 2 0x80865dc 0x3e5dc 0xd51 .rodata1
137 0 0 0x4 0
138
139 [12] 1 3 0x8088330 0x3f330 0x20afc .data
140 0 0 0x4 0
141
142 [13] 1 3 0x80a8e2c 0x5fe2c 0x89d .data1
143 0 0 0x4 0
144
145 [14] 1 3 0x80a96cc 0x606cc 0x1a8 .got
146 0 0 0x4 0x4
147
148 [15] 6 3 0x80a9874 0x60874 0x80 .dynamic
149 4 0 0x4 0x8
150
151 [16] 8 3 0x80a98f4 0x608f4 0x449c .bss
152 0 0 0x4 0
153
154 [17] 2 0 0 0x608f4 0x9b90 .symtab
155 18 371 0x4 0x10
156
157 [18] 3 0 0 0x6a484 0x8526 .strtab
158 0 0 0x1 0
159
160 [19] 3 0 0 0x729aa 0x93 .shstrtab
161 0 0 0x1 0
162
163 [20] 1 0 0 0x72a3d 0x68b7 .comment
164 0 0 0x1 0
165
166 raid:/nfs/raid/src/dist-18.56/src> dump -h xemacs
167
168 xemacs:
169
170 **** SECTION HEADER TABLE ****
171 [No] Type Flags Addr Offset Size Name
172 Link Info Adralgn Entsize
173
174 [1] 1 2 0x80480d4 0xd4 0x13 .interp
175 0 0 0x1 0
176
177 [2] 5 2 0x80480e8 0xe8 0x388 .hash
178 3 0 0x4 0x4
179
180 [3] 11 2 0x8048470 0x470 0x7f0 .dynsym
181 4 1 0x4 0x10
182
183 [4] 3 2 0x8048c60 0xc60 0x3ad .dynstr
184 0 0 0x1 0
185
186 [5] 9 2 0x8049010 0x1010 0x338 .rel.plt
187 3 7 0x4 0x8
188
189 [6] 1 6 0x8049348 0x1348 0x3 .init
190 0 0 0x4 0
191
192 [7] 1 6 0x804934c 0x134c 0x680 .plt
193 0 0 0x4 0x4
194
195 [8] 1 6 0x80499cc 0x19cc 0x3c56f .text
196 0 0 0x4 0
197
198 [9] 1 6 0x8085f3c 0x3df3c 0x3 .fini
199 0 0 0x4 0
200
201 [10] 1 2 0x8085f40 0x3df40 0x69c .rodata
202 0 0 0x4 0
203
204 [11] 1 2 0x80865dc 0x3e5dc 0xd51 .rodata1
205 0 0 0x4 0
206
207 [12] 1 3 0x8088330 0x3f330 0x20afc .data
208 0 0 0x4 0
209
210 [13] 1 3 0x80a8e2c 0x5fe2c 0x89d .data1
211 0 0 0x4 0
212
213 [14] 1 3 0x80a96cc 0x606cc 0x1a8 .got
214 0 0 0x4 0x4
215
216 [15] 6 3 0x80a9874 0x60874 0x80 .dynamic
217 4 0 0x4 0x8
218
219 [16] 8 3 0x80c6800 0x7d800 0 .bss
220 0 0 0x4 0
221
222 [17] 2 0 0 0x7d800 0x9b90 .symtab
223 18 371 0x4 0x10
224
225 [18] 3 0 0 0x87390 0x8526 .strtab
226 0 0 0x1 0
227
228 [19] 3 0 0 0x8f8b6 0x93 .shstrtab
229 0 0 0x1 0
230
231 [20] 1 0 0 0x8f949 0x68b7 .comment
232 0 0 0x1 0
233
234 [21] 1 3 0x80a98f4 0x608f4 0x1cf0c .data
235 0 0 0x4 0
236
237 * This is an example of how the file header is changed. "Shoff" is
238 * the section header offset within the file. Since that table is
239 * after the new .data section, it is moved. "Shnum" is the number of
240 * sections, which we increment.
241 *
242 * "Phoff" is the file offset to the program header. "Phentsize" and
243 * "Shentsz" are the program and section header entries sizes respectively.
244 * These can be larger than the apparent struct sizes.
245
246 raid:/nfs/raid/src/dist-18.56/src> dump -f temacs
247
248 temacs:
249
250 **** ELF HEADER ****
251 Class Data Type Machine Version
252 Entry Phoff Shoff Flags Ehsize
253 Phentsize Phnum Shentsz Shnum Shstrndx
254
255 1 1 2 3 1
256 0x80499cc 0x34 0x792f4 0 0x34
257 0x20 5 0x28 21 19
258
259 raid:/nfs/raid/src/dist-18.56/src> dump -f xemacs
260
261 xemacs:
262
263 **** ELF HEADER ****
264 Class Data Type Machine Version
265 Entry Phoff Shoff Flags Ehsize
266 Phentsize Phnum Shentsz Shnum Shstrndx
267
268 1 1 2 3 1
269 0x80499cc 0x34 0x96200 0 0x34
270 0x20 5 0x28 22 19
271
272 * These are the program headers. "Offset" is the file offset to the
273 * segment. "Vaddr" is the memory load address. "Filesz" is the
274 * segment size as it appears in the file, and "Memsz" is the size in
275 * memory. Below, the third segment is the code and the fourth is the
276 * data: the difference between Filesz and Memsz is .bss
277
278 raid:/nfs/raid/src/dist-18.56/src> dump -o temacs
279
280 temacs:
281 ***** PROGRAM EXECUTION HEADER *****
282 Type Offset Vaddr Paddr
283 Filesz Memsz Flags Align
284
285 6 0x34 0x8048034 0
286 0xa0 0xa0 5 0
287
288 3 0xd4 0 0
289 0x13 0 4 0
290
291 1 0x34 0x8048034 0
292 0x3f2f9 0x3f2f9 5 0x1000
293
294 1 0x3f330 0x8088330 0
295 0x215c4 0x25a60 7 0x1000
296
297 2 0x60874 0x80a9874 0
298 0x80 0 7 0
299
300 raid:/nfs/raid/src/dist-18.56/src> dump -o xemacs
301
302 xemacs:
303 ***** PROGRAM EXECUTION HEADER *****
304 Type Offset Vaddr Paddr
305 Filesz Memsz Flags Align
306
307 6 0x34 0x8048034 0
308 0xa0 0xa0 5 0
309
310 3 0xd4 0 0
311 0x13 0 4 0
312
313 1 0x34 0x8048034 0
314 0x3f2f9 0x3f2f9 5 0x1000
315
316 1 0x3f330 0x8088330 0
317 0x3e4d0 0x3e4d0 7 0x1000
318
319 2 0x60874 0x80a9874 0
320 0x80 0 7 0
321
322
323 */
324
325 /* Modified by wtien@urbana.mcd.mot.com of Motorola Inc.
326 *
327 * The above mechanism does not work if the unexeced ELF file is being
328 * re-layout by other applications (such as `strip'). All the applications
329 * that re-layout the internal of ELF will layout all sections in ascending
330 * order of their file offsets. After the re-layout, the data2 section will
331 * still be the LAST section in the section header vector, but its file offset
332 * is now being pushed far away down, and causes part of it not to be mapped
333 * in (ie. not covered by the load segment entry in PHDR vector), therefore
334 * causes the new binary to fail.
335 *
336 * The solution is to modify the unexec algorithm to insert the new data2
337 * section header right before the new bss section header, so their file
338 * offsets will be in the ascending order. Since some of the section's (all
339 * sections AFTER the bss section) indexes are now changed, we also need to
340 * modify some fields to make them point to the right sections. This is done
341 * by macro PATCH_INDEX. All the fields that need to be patched are:
342 *
343 * 1. ELF header e_shstrndx field.
344 * 2. section header sh_link and sh_info field.
345 * 3. symbol table entry st_shndx field.
346 *
347 * The above example now should look like:
348
349 **** SECTION HEADER TABLE ****
350 [No] Type Flags Addr Offset Size Name
351 Link Info Adralgn Entsize
352
353 [1] 1 2 0x80480d4 0xd4 0x13 .interp
354 0 0 0x1 0
355
356 [2] 5 2 0x80480e8 0xe8 0x388 .hash
357 3 0 0x4 0x4
358
359 [3] 11 2 0x8048470 0x470 0x7f0 .dynsym
360 4 1 0x4 0x10
361
362 [4] 3 2 0x8048c60 0xc60 0x3ad .dynstr
363 0 0 0x1 0
364
365 [5] 9 2 0x8049010 0x1010 0x338 .rel.plt
366 3 7 0x4 0x8
367
368 [6] 1 6 0x8049348 0x1348 0x3 .init
369 0 0 0x4 0
370
371 [7] 1 6 0x804934c 0x134c 0x680 .plt
372 0 0 0x4 0x4
373
374 [8] 1 6 0x80499cc 0x19cc 0x3c56f .text
375 0 0 0x4 0
376
377 [9] 1 6 0x8085f3c 0x3df3c 0x3 .fini
378 0 0 0x4 0
379
380 [10] 1 2 0x8085f40 0x3df40 0x69c .rodata
381 0 0 0x4 0
382
383 [11] 1 2 0x80865dc 0x3e5dc 0xd51 .rodata1
384 0 0 0x4 0
385
386 [12] 1 3 0x8088330 0x3f330 0x20afc .data
387 0 0 0x4 0
388
389 [13] 1 3 0x80a8e2c 0x5fe2c 0x89d .data1
390 0 0 0x4 0
391
392 [14] 1 3 0x80a96cc 0x606cc 0x1a8 .got
393 0 0 0x4 0x4
394
395 [15] 6 3 0x80a9874 0x60874 0x80 .dynamic
396 4 0 0x4 0x8
397
398 [16] 1 3 0x80a98f4 0x608f4 0x1cf0c .data
399 0 0 0x4 0
400
401 [17] 8 3 0x80c6800 0x7d800 0 .bss
402 0 0 0x4 0
403
404 [18] 2 0 0 0x7d800 0x9b90 .symtab
405 19 371 0x4 0x10
406
407 [19] 3 0 0 0x87390 0x8526 .strtab
408 0 0 0x1 0
409
410 [20] 3 0 0 0x8f8b6 0x93 .shstrtab
411 0 0 0x1 0
412
413 [21] 1 0 0 0x8f949 0x68b7 .comment
414 0 0 0x1 0
415
416 */ 70 */
417 71
418 #ifndef emacs 72 #ifndef emacs
419 #define fatal(a, b, c) fprintf (stderr, a, b, c), exit (1) 73 #define fatal(a, b, c) fprintf (stderr, a, b, c), exit (1)
420 #include <string.h> 74 #include <string.h>
428 #include <sys/stat.h> 82 #include <sys/stat.h>
429 #include <memory.h> 83 #include <memory.h>
430 #include <errno.h> 84 #include <errno.h>
431 #include <unistd.h> 85 #include <unistd.h>
432 #include <fcntl.h> 86 #include <fcntl.h>
433 #if !defined (__NetBSD__) && !defined (__OpenBSD__) 87 #ifdef HAVE_ELF_H
434 #include <elf.h> 88 #include <elf.h>
435 #endif 89 #endif
436 #include <sys/mman.h> 90 #include <sys/mman.h>
437 #if defined (__sony_news) && defined (_SYSTYPE_SYSV) 91 #if defined (__sony_news) && defined (_SYSTYPE_SYSV)
438 #include <sys/elf_mips.h> 92 #include <sys/elf_mips.h>
439 #include <sym.h> 93 #include <sym.h>
440 #endif /* __sony_news && _SYSTYPE_SYSV */ 94 #endif /* __sony_news && _SYSTYPE_SYSV */
441 #if __sgi 95 #if __sgi
442 #include <syms.h> /* for HDRR declaration */ 96 #include <syms.h> /* for HDRR declaration */
443 #endif /* __sgi */ 97 #endif /* __sgi */
444
445 #if defined (__alpha__) && !defined (__NetBSD__) && !defined (__OpenBSD__)
446 /* Declare COFF debugging symbol table. This used to be in
447 /usr/include/sym.h, but this file is no longer included in Red Hat
448 5.0 and presumably in any other glibc 2.x based distribution. */
449 typedef struct {
450 short magic;
451 short vstamp;
452 int ilineMax;
453 int idnMax;
454 int ipdMax;
455 int isymMax;
456 int ioptMax;
457 int iauxMax;
458 int issMax;
459 int issExtMax;
460 int ifdMax;
461 int crfd;
462 int iextMax;
463 long cbLine;
464 long cbLineOffset;
465 long cbDnOffset;
466 long cbPdOffset;
467 long cbSymOffset;
468 long cbOptOffset;
469 long cbAuxOffset;
470 long cbSsOffset;
471 long cbSsExtOffset;
472 long cbFdOffset;
473 long cbRfdOffset;
474 long cbExtOffset;
475 } HDRR, *pHDRR;
476 #define cbHDRR sizeof(HDRR)
477 #define hdrNil ((pHDRR)0)
478 #endif
479
480 #ifdef __NetBSD__
481 /*
482 * NetBSD does not have normal-looking user-land ELF support.
483 */
484 # if defined __alpha__ || defined __sparc_v9__
485 # define ELFSIZE 64
486 # else
487 # define ELFSIZE 32
488 # endif
489 # include <sys/exec_elf.h>
490
491 # ifndef PT_LOAD
492 # define PT_LOAD Elf_pt_load
493 # if 0 /* was in pkgsrc patches for 20.7 */
494 # define SHT_PROGBITS Elf_sht_progbits
495 # endif
496 # define SHT_SYMTAB Elf_sht_symtab
497 # define SHT_DYNSYM Elf_sht_dynsym
498 # define SHT_NULL Elf_sht_null
499 # define SHT_NOBITS Elf_sht_nobits
500 # define SHT_REL Elf_sht_rel
501 # define SHT_RELA Elf_sht_rela
502
503 # define SHN_UNDEF Elf_eshn_undefined
504 # define SHN_ABS Elf_eshn_absolute
505 # define SHN_COMMON Elf_eshn_common
506 # endif /* !PT_LOAD */
507
508 # ifdef __alpha__
509 # include <sys/exec_ecoff.h>
510 # define HDRR struct ecoff_symhdr
511 # define pHDRR HDRR *
512 # endif /* __alpha__ */
513
514 #ifdef __mips__ /* was in pkgsrc patches for 20.7 */
515 # define SHT_MIPS_DEBUG DT_MIPS_FLAGS
516 # define HDRR struct Elf_Shdr
517 #endif /* __mips__ */
518 #endif /* __NetBSD__ */
519
520 #ifdef __OpenBSD__
521 # include <sys/exec_elf.h>
522 #endif
523 98
524 #if __GNU_LIBRARY__ - 0 >= 6 99 #if __GNU_LIBRARY__ - 0 >= 6
525 # include <link.h> /* get ElfW etc */ 100 # include <link.h> /* get ElfW etc */
526 #endif 101 #endif
527 102
544 #ifndef ELF_BSS_SECTION_NAME 119 #ifndef ELF_BSS_SECTION_NAME
545 #define ELF_BSS_SECTION_NAME ".bss" 120 #define ELF_BSS_SECTION_NAME ".bss"
546 #endif 121 #endif
547 122
548 /* Get the address of a particular section or program header entry, 123 /* Get the address of a particular section or program header entry,
549 * accounting for the size of the entries. 124 * accounting for the size of the entries. */
550 */
551 /*
552 On PPC Reference Platform running Solaris 2.5.1
553 the plt section is also of type NOBI like the bss section.
554 (not really stored) and therefore sections after the bss
555 section start at the plt offset. The plt section is always
556 the one just before the bss section.
557 Thus, we modify the test from
558 if (NEW_SECTION_H (nn).sh_offset >= new_data2_offset)
559 to
560 if (NEW_SECTION_H (nn).sh_offset >=
561 OLD_SECTION_H (old_bss_index-1).sh_offset)
562 This is just a hack. We should put the new data section
563 before the .plt section.
564 And we should not have this routine at all but use
565 the libelf library to read the old file and create the new
566 file.
567 The changed code is minimal and depends on prep set in m/prep.h
568 Erik Deumens
569 Quantum Theory Project
570 University of Florida
571 deumens@qtp.ufl.edu
572 Apr 23, 1996
573 */
574 125
575 #define OLD_SECTION_H(n) \ 126 #define OLD_SECTION_H(n) \
576 (*(ElfW(Shdr) *) ((byte *) old_section_h + old_file_h->e_shentsize * (n))) 127 (*(ElfW(Shdr) *) ((byte *) old_section_h + old_file_h->e_shentsize * (n)))
577 #define NEW_SECTION_H(n) \ 128 #define NEW_SECTION_H(n) \
578 (*(ElfW(Shdr) *) ((byte *) new_section_h + new_file_h->e_shentsize * (n))) 129 (*(ElfW(Shdr) *) ((byte *) new_section_h + new_file_h->e_shentsize * (n)))
581 #define NEW_PROGRAM_H(n) \ 132 #define NEW_PROGRAM_H(n) \
582 (*(ElfW(Phdr) *) ((byte *) new_program_h + new_file_h->e_phentsize * (n))) 133 (*(ElfW(Phdr) *) ((byte *) new_program_h + new_file_h->e_phentsize * (n)))
583 134
584 #define PATCH_INDEX(n) \ 135 #define PATCH_INDEX(n) \
585 do { \ 136 do { \
586 if ((int) (n) >= old_bss_index) \ 137 if ((int) (n) >= growme_index) \
587 (n)++; } while (0) 138 (n)++; } while (0)
139
588 typedef unsigned char byte; 140 typedef unsigned char byte;
589 141
590 /* Round X up to a multiple of Y. */ 142 /* Round X up to a multiple of Y. */
591 143
592 static ElfW(Addr) 144 static ElfW(Addr)
605 If we don't find the section NAME, that is a fatal error 157 If we don't find the section NAME, that is a fatal error
606 if NOERROR is 0; we return -1 if NOERROR is nonzero. */ 158 if NOERROR is 0; we return -1 if NOERROR is nonzero. */
607 159
608 static int 160 static int
609 find_section (char *name, 161 find_section (char *name,
610 char *section_names, 162 const char *section_names,
611 char *file_name, 163 char *file_name,
612 ElfW(Ehdr) *old_file_h, 164 ElfW(Ehdr) *old_file_h,
613 ElfW(Shdr) *old_section_h, 165 ElfW(Shdr) *old_section_h,
614 int noerror) 166 int noerror)
615 { 167 {
621 fprintf (stderr, "Looking for %s - found %s\n", name, 173 fprintf (stderr, "Looking for %s - found %s\n", name,
622 section_names + OLD_SECTION_H (idx).sh_name); 174 section_names + OLD_SECTION_H (idx).sh_name);
623 #endif 175 #endif
624 if (!strcmp (section_names + OLD_SECTION_H (idx).sh_name, 176 if (!strcmp (section_names + OLD_SECTION_H (idx).sh_name,
625 name)) 177 name))
626 break; 178 return idx;
627 } 179 }
628 if (idx == old_file_h->e_shnum) 180
629 { 181 /* If we're here, we found nothing or return did not work */
630 if (noerror) 182 if ( ! noerror)
631 return -1; 183 fatal ("Can't find %s in %s.\n", name, file_name);
632 else 184
633 fatal ("Can't find %s in %s.\n", name, file_name); 185 return -1;
634 }
635
636 return idx;
637 } 186 }
638 187
639 /* **************************************************************** 188 /* ****************************************************************
640 * unexec 189 * unexec
641 * 190 *
650 char *old_name, 199 char *old_name,
651 uintptr_t data_start, 200 uintptr_t data_start,
652 uintptr_t bss_start, 201 uintptr_t bss_start,
653 uintptr_t entry_address) 202 uintptr_t entry_address)
654 { 203 {
655 int new_file, old_file, new_file_size; 204 int old_file;
656 205
657 /* Pointers to the base of the image of the two files. */ 206 struct stat stat_buf;
658 caddr_t old_base, new_base; 207 caddr_t old_base, new_base;
659 208
660 /* Pointers to the file, program and section headers for the old and new 209 ElfW(Ehdr) *old_file_h, * new_file_h;
661 * files. 210 ElfW(Phdr) *old_program_h, * new_program_h;
662 */ 211 ElfW(Shdr) *old_section_h, * new_section_h;
663 ElfW(Ehdr) *old_file_h, *new_file_h; 212 ElfW(Shdr) * growme = NULL, * grown = NULL;
664 ElfW(Phdr) *old_program_h, *new_program_h; 213 ElfW(Addr) old_bss_addr = 0, new_data2_addr = 0;
665 ElfW(Shdr) *old_section_h, *new_section_h; 214
666 215 int growme_index = -1;
667 /* Point to the section name table in the old file */
668 char *old_section_names;
669
670 ElfW(Addr) old_bss_addr, new_bss_addr;
671 ElfW(Word) old_bss_size, new_data2_size;
672 ElfW(Off) new_data2_offset;
673 ElfW(Addr) new_data2_addr;
674
675 int n, nn; 216 int n, nn;
676 int old_bss_index, old_sbss_index; 217 const char *old_section_names;
677 int old_data_index, new_data2_index; 218 int old_mdebug_index, old_data_index;
678 int old_mdebug_index; 219 int new_bss_addr, new_data2_size, new_data2_offset, new_file, new_file_size;
679 struct stat stat_buf; 220
680 221 /* Open the old file */
681 /* Open the old file & map it into the address space. */ 222 if ( (old_file = open (old_name, O_RDONLY)) < 0 )
682 223 fatal ("Can't open %s for reading: errno %d\n", old_name, errno);
683 old_file = open (old_name, O_RDONLY);
684
685 if (old_file < 0)
686 fatal ("Can't open %s for reading: errno %d\n", old_name, errno);
687 224
688 if (fstat (old_file, &stat_buf) == -1) 225 if (fstat (old_file, &stat_buf) == -1)
689 fatal ("Can't fstat (%s): errno %d\n", old_name, errno); 226 fatal ("Can't fstat (%s): errno %d\n", old_name, errno);
690 227
691 old_base = (caddr_t) mmap ((caddr_t) 0, stat_buf.st_size, 228 /* map old file into the address space. */
692 PROT_READ, MAP_SHARED, old_file, 0); 229 if ( (old_base = (caddr_t) mmap ((caddr_t) 0, stat_buf.st_size,
693 230 PROT_READ, MAP_SHARED, old_file, 0)) < 0 )
694 if (old_base == (caddr_t) -1) 231 fatal ("Can't mmap (%s): errno %d\n", old_name, errno);
695 fatal ("Can't mmap (%s): errno %d\n", old_name, errno); 232
696 233 old_file_h = (ElfW(Ehdr) *) old_base;
697 #ifdef DEBUG
698 fprintf (stderr, "mmap (%s, %x) -> %x\n", old_name, stat_buf.st_size,
699 old_base);
700 #endif
701
702 /* Get pointers to headers & section names */
703
704 old_file_h = (ElfW(Ehdr) *) old_base;
705 old_program_h = (ElfW(Phdr) *) ((byte *) old_base + old_file_h->e_phoff); 234 old_program_h = (ElfW(Phdr) *) ((byte *) old_base + old_file_h->e_phoff);
706 old_section_h = (ElfW(Shdr) *) ((byte *) old_base + old_file_h->e_shoff); 235 old_section_h = (ElfW(Shdr) *) ((byte *) old_base + old_file_h->e_shoff);
707 old_section_names = (char *) old_base 236 old_section_names = (const char *) old_base
708 + OLD_SECTION_H (old_file_h->e_shstrndx).sh_offset; 237 + OLD_SECTION_H (old_file_h->e_shstrndx).sh_offset;
709 238
710 /* Find the mdebug section, if any. */ 239 /* Find a section which we will grow by looking for the SHT_NOBITS
711 240 * section with ALLOCATE flag and with the biggest address. */
712 old_mdebug_index = find_section (".mdebug", old_section_names, 241 for (n = 1; n < old_file_h->e_shnum; n++) {
713 old_name, old_file_h, old_section_h, 1); 242 ElfW(Shdr) * sh = & OLD_SECTION_H(n);
714 243
715 /* Find the old .bss section. Figure out parameters of the new 244 if ((sh->sh_type == SHT_NOBITS) && (sh->sh_flags & SHF_ALLOC)) {
716 * data2 and bss sections. 245 if ( old_bss_addr < sh->sh_addr ) {
717 */ 246 growme = sh;
718 247 growme_index = n;
719 old_bss_index = find_section (".bss", old_section_names, 248 new_data2_addr = old_bss_addr = sh->sh_addr;
720 old_name, old_file_h, old_section_h, 0); 249 }
721 250 }
722 old_sbss_index = find_section (".sbss", old_section_names, 251 }
723 old_name, old_file_h, old_section_h, 1); 252
724 if (old_sbss_index != -1) 253 if (growme == NULL )
725 if (OLD_SECTION_H (old_sbss_index).sh_type == SHT_PROGBITS) 254 fatal ("Can't find a section to grow\n", 0, 0);
726 old_sbss_index = -1;
727
728 if (old_sbss_index == -1)
729 {
730 old_bss_addr = OLD_SECTION_H (old_bss_index).sh_addr;
731 old_bss_size = OLD_SECTION_H (old_bss_index).sh_size;
732 new_data2_index = old_bss_index;
733 }
734 else
735 {
736 old_bss_addr = OLD_SECTION_H (old_sbss_index).sh_addr;
737 old_bss_size = OLD_SECTION_H (old_bss_index).sh_size
738 + OLD_SECTION_H (old_sbss_index).sh_size;
739 new_data2_index = old_sbss_index;
740 }
741
742 /* Find the old .data section. Figure out parameters of
743 the new data2 and bss sections. */
744 255
745 old_data_index = find_section (".data", old_section_names, 256 old_data_index = find_section (".data", old_section_names,
746 old_name, old_file_h, old_section_h, 0); 257 old_name, old_file_h, old_section_h, 0);
747 258
748 #if defined (emacs) || !defined (DEBUG)
749 new_bss_addr = (ElfW(Addr)) sbrk (0); 259 new_bss_addr = (ElfW(Addr)) sbrk (0);
750 #else
751 new_bss_addr = old_bss_addr + old_bss_size + 0x1234;
752 #endif
753 new_data2_addr = old_bss_addr;
754 new_data2_size = new_bss_addr - old_bss_addr; 260 new_data2_size = new_bss_addr - old_bss_addr;
755 new_data2_offset = OLD_SECTION_H (old_data_index).sh_offset + 261 new_data2_offset = OLD_SECTION_H (old_data_index).sh_offset +
756 (new_data2_addr - OLD_SECTION_H (old_data_index).sh_addr); 262 (new_data2_addr - OLD_SECTION_H (old_data_index).sh_addr);
757 263
758 #ifdef DEBUG 264 if ( new_bss_addr < old_bss_addr + growme->sh_size )
759 fprintf (stderr, "old_bss_index %d\n", old_bss_index); 265 fatal (".bss shrank when undumping???\n", 0, 0);
760 fprintf (stderr, "old_bss_addr %x\n", old_bss_addr); 266
761 fprintf (stderr, "old_bss_size %x\n", old_bss_size); 267 /* Set the output file to the right size and mmap it. */
762 fprintf (stderr, "new_bss_addr %x\n", new_bss_addr); 268 if ( (new_file = open (new_name, O_RDWR | O_CREAT, 0666)) < 0 )
763 fprintf (stderr, "new_data2_addr %x\n", new_data2_addr); 269 fatal ("Can't create (%s): errno %d\n", new_name, errno);
764 fprintf (stderr, "new_data2_size %x\n", new_data2_size); 270
765 fprintf (stderr, "new_data2_offset %x\n", new_data2_offset); 271 new_file_size = stat_buf.st_size + old_file_h->e_shentsize + new_data2_size;
766 #endif
767
768 if ((unsigned) new_bss_addr < (unsigned) old_bss_addr + old_bss_size)
769 fatal (".bss shrank when undumping???\n", 0, 0);
770
771 /* Set the output file to the right size and mmap it. Set
772 * pointers to various interesting objects. stat_buf still has
773 * old_file data.
774 */
775
776 new_file = open (new_name, O_RDWR | O_CREAT, 0666);
777 if (new_file < 0)
778 fatal ("Can't creat (%s): errno %d\n", new_name, errno);
779
780 new_file_size = stat_buf.st_size + old_file_h->e_shentsize + new_data2_size;
781 272
782 if (ftruncate (new_file, new_file_size)) 273 if (ftruncate (new_file, new_file_size))
783 fatal ("Can't ftruncate (%s): errno %d\n", new_name, errno); 274 fatal ("Can't ftruncate (%s): errno %d\n", new_name, errno);
784 275
785 #ifdef UNEXEC_USE_MAP_PRIVATE
786 new_base = (caddr_t) mmap ((caddr_t) 0, new_file_size, 276 new_base = (caddr_t) mmap ((caddr_t) 0, new_file_size,
787 PROT_READ | PROT_WRITE, 277 PROT_READ | PROT_WRITE,
788 MAP_PRIVATE, new_file, 0); 278 #ifdef UNEXEC_USE_MAP_PRIVATE
279 MAP_PRIVATE,
789 #else 280 #else
790 new_base = (caddr_t) mmap ((caddr_t) 0, new_file_size, 281 MAP_SHARED,
791 PROT_READ | PROT_WRITE, 282 #endif
792 MAP_SHARED, new_file, 0); 283 new_file, 0);
793 #endif
794 284
795 if (new_base == (caddr_t) -1) 285 if (new_base == (caddr_t) -1)
796 fatal ("Can't mmap (%s): errno %d\n", new_name, errno); 286 fatal ("Can't mmap (%s): errno %d\n", new_name, errno);
797 287
798 new_file_h = (ElfW(Ehdr) *) new_base; 288 new_file_h = (ElfW(Ehdr) *) new_base;
799 new_program_h = (ElfW(Phdr) *) ((byte *) new_base + old_file_h->e_phoff); 289 new_program_h = (ElfW(Phdr) *) ((byte *) new_base + old_file_h->e_phoff);
800 new_section_h = (ElfW(Shdr) *) 290 new_section_h = (ElfW(Shdr) *) ((byte *) new_base + old_file_h->e_shoff +
801 ((byte *) new_base + old_file_h->e_shoff + new_data2_size); 291 new_data2_size);
802 292
803 /* Make our new file, program and section headers as copies of the 293 /* Make our new file, program and section headers as copies of the
804 * originals. 294 * originals. */
805 */
806
807 memcpy (new_file_h, old_file_h, old_file_h->e_ehsize); 295 memcpy (new_file_h, old_file_h, old_file_h->e_ehsize);
808 memcpy (new_program_h, old_program_h, 296 memcpy (new_program_h, old_program_h,
809 old_file_h->e_phnum * old_file_h->e_phentsize); 297 old_file_h->e_phnum * old_file_h->e_phentsize);
810 298
811 /* Modify the e_shstrndx if necessary. */ 299 /* Modify the e_shstrndx if necessary. */
812 PATCH_INDEX (new_file_h->e_shstrndx); 300 PATCH_INDEX (new_file_h->e_shstrndx);
813 301
814 /* Fix up file header. We'll add one section. Section header is 302 /* Fix up file header. We'll add one section. Section header is
815 * further away now. 303 * further away now. */
816 */
817
818 new_file_h->e_shoff += new_data2_size; 304 new_file_h->e_shoff += new_data2_size;
819 new_file_h->e_shnum += 1; 305 new_file_h->e_shnum += 1;
820 306
307 /* Fix up a new program header by extending the writable data
308 * segment so that the bss area is covered too. Find that segment by
309 * looking for one that starts before and ends after the .bss and is
310 * PT_LOADable. */
311 for (n = new_file_h->e_phnum - 1; n >= 0; n--) {
312 ElfW(Phdr) * ph = & NEW_PROGRAM_H(n);
821 #ifdef DEBUG 313 #ifdef DEBUG
822 fprintf (stderr, "Old section offset %x\n", old_file_h->e_shoff); 314 printf ("%d @ %0x + %0x against %0x + %0x",
823 fprintf (stderr, "Old section count %d\n", old_file_h->e_shnum); 315 n, ph->p_vaddr, ph->p_memsz,growme->sh_addr, growme->sh_size);
824 fprintf (stderr, "New section offset %x\n", new_file_h->e_shoff); 316 #endif
825 fprintf (stderr, "New section count %d\n", new_file_h->e_shnum); 317 if ((ph->p_type == PT_LOAD) &&
826 #endif 318 (ph->p_vaddr <= growme->sh_addr) &&
827 319 ((ph->p_vaddr+ph->p_memsz) >= (growme->sh_addr + growme->sh_size))) {
828 /* Fix up a new program header. Extend the writable data segment so 320 /* Make sure that the size includes any padding before the
829 * that the bss area is covered too. Find that segment by looking 321 * old .bss section. */
830 * for a segment that ends just before the .bss area. Make sure 322 ph->p_memsz = ph->p_filesz = new_bss_addr - ph->p_vaddr;
831 * that no segments are above the new .data2. Put a loop at the end 323 #ifdef DEBUG
832 * to adjust the offset and address of any segment that is above 324 puts (" That's the one!");
833 * data2, just in case we decide to allow this later. 325 #endif
834 */ 326 break;
835 327 }
836 for (n = new_file_h->e_phnum - 1; n >= 0; n--) 328 #ifdef DEBUG
837 { 329 putchar ('\n');
838 /* Compute maximum of all requirements for alignment of section. */ 330 #endif
839 ElfW(Word) alignment = (NEW_PROGRAM_H (n)).p_align; 331 }
840 if ((OLD_SECTION_H (old_bss_index)).sh_addralign > alignment) 332
841 alignment = OLD_SECTION_H (old_bss_index).sh_addralign;
842
843 #ifdef __sgi
844 /* According to r02kar@x4u2.desy.de (Karsten Kuenne)
845 and oliva@gnu.org (Alexandre Oliva), on IRIX 5.2, we
846 always get "Program segment above .bss" when dumping
847 when the executable doesn't have an sbss section. */
848 if (old_sbss_index != -1)
849 #endif /* __sgi */
850 if (NEW_PROGRAM_H (n).p_vaddr + NEW_PROGRAM_H (n).p_filesz
851 > (old_sbss_index == -1
852 ? old_bss_addr
853 : round_up (old_bss_addr, alignment)))
854 fatal ("Program segment above .bss in %s\n", old_name, 0);
855
856 if (NEW_PROGRAM_H (n).p_type == PT_LOAD
857 && (round_up ((NEW_PROGRAM_H (n)).p_vaddr
858 + (NEW_PROGRAM_H (n)).p_filesz,
859 alignment)
860 == round_up (old_bss_addr, alignment)))
861 break;
862 }
863 if (n < 0) 333 if (n < 0)
864 fatal ("Couldn't find segment next to .bss in %s\n", old_name, 0); 334 fatal ("Couldn't find segment which covers %s",
865 335 old_section_names + growme->sh_name);
866 /* Make sure that the size includes any padding before the old .bss 336
867 section. */ 337 /* Walk through all section headers, insert the new data2 section
868 NEW_PROGRAM_H (n).p_filesz = new_bss_addr - NEW_PROGRAM_H (n).p_vaddr; 338 * right before the new bss section. */
869 NEW_PROGRAM_H (n).p_memsz = NEW_PROGRAM_H (n).p_filesz; 339 for (n = 1, nn = 1; n < (int) old_file_h->e_shnum; n++, nn++) {
870 340 ElfW(Shdr) * nsec = & NEW_SECTION_H(nn);
871 #if 0 /* Maybe allow section after data2 - does this ever happen? */ 341 ElfW(Shdr) * osec = & OLD_SECTION_H(n);
872 for (n = new_file_h->e_phnum - 1; n >= 0; n--) 342
873 { 343 /* If this is the section we want to grow, insert the new data
874 if (NEW_PROGRAM_H (n).p_vaddr 344 * section before it. */
875 && NEW_PROGRAM_H (n).p_vaddr >= new_data2_addr) 345 if ( osec == growme ) {
876 NEW_PROGRAM_H (n).p_vaddr += new_data2_size - old_bss_size; 346 /* Steal the data section header for this data2 section but
877 347 * use the * 'grow' section's alignment. This * will assure
878 if (NEW_PROGRAM_H (n).p_offset >= new_data2_offset) 348 * that the new section * always be placed in the same spot
879 NEW_PROGRAM_H (n).p_offset += new_data2_size; 349 * * as the old section by any other * application. */
880 } 350 ElfW(Shdr) * od = &OLD_SECTION_H(old_data_index);
881 #endif 351
882 352 memcpy (nsec, od, new_file_h->e_shentsize);
883 /* Fix up section headers based on new .data2 section. Any section 353
884 * whose offset or virtual address is after the new .data2 section 354 nsec->sh_addr = new_data2_addr;
885 * gets its value adjusted. .bss size becomes zero and new address 355 nsec->sh_offset = new_data2_offset;
886 * is set. data2 section header gets added by copying the existing 356 nsec->sh_size = new_data2_size;
887 * .data header and modifying the offset, address and size. 357 nsec->sh_addralign = osec->sh_addralign;
888 */ 358
889 for (old_data_index = 1; old_data_index < (int) old_file_h->e_shnum; 359 /* Copy over what we have in memory now. */
890 old_data_index++) 360 memcpy (nsec->sh_offset + new_base, (caddr_t) osec->sh_addr,
891 if (!strcmp (old_section_names + OLD_SECTION_H (old_data_index).sh_name,
892 ".data"))
893 break;
894 if (old_data_index == old_file_h->e_shnum)
895 fatal ("Can't find .data in %s.\n", old_name, 0);
896
897 /* Walk through all section headers, insert the new data2 section right
898 before the new bss section. */
899 for (n = 1, nn = 1; n < (int) old_file_h->e_shnum; n++, nn++)
900 {
901 caddr_t src;
902 /* If it is (s)bss section, insert the new data2 section before it. */
903 /* new_data2_index is the index of either old_sbss or old_bss, that was
904 chosen as a section for new_data2. */
905 if (n == new_data2_index)
906 {
907 /* Steal the data section header for this data2 section. */
908 memcpy (&NEW_SECTION_H (nn), &OLD_SECTION_H (old_data_index),
909 new_file_h->e_shentsize);
910
911 NEW_SECTION_H (nn).sh_addr = new_data2_addr;
912 NEW_SECTION_H (nn).sh_offset = new_data2_offset;
913 NEW_SECTION_H (nn).sh_size = new_data2_size;
914 /* Use the bss section's alignment. This will assure that the
915 new data2 section always be placed in the same spot as the old
916 bss section by any other application. */
917 NEW_SECTION_H (nn).sh_addralign = OLD_SECTION_H (n).sh_addralign;
918
919 /* Now copy over what we have in the memory now. */
920 memcpy (NEW_SECTION_H (nn).sh_offset + new_base,
921 (caddr_t) OLD_SECTION_H (n).sh_addr,
922 new_data2_size); 361 new_data2_size);
923 nn++; 362 nn++;
924 } 363 grown = nsec++;
925 364 }
926 memcpy (&NEW_SECTION_H (nn), &OLD_SECTION_H (n), 365
927 old_file_h->e_shentsize); 366 memcpy (nsec, osec, old_file_h->e_shentsize);
928 367
929 if (n == old_bss_index 368 if ( osec == growme ) {
930 /* The new bss and sbss section's size is zero, and its file offset 369 /* The new bss section's size is zero, and its file offset
931 and virtual address should be off by NEW_DATA2_SIZE. */ 370 * and virtual address should be off by NEW_DATA2_SIZE. */
932 || n == old_sbss_index 371 nsec->sh_offset = grown->sh_offset + new_data2_size;
933 ) 372 nsec->sh_addr = grown->sh_addr + new_data2_size;
934 { 373
935 /* NN should be `old_s?bss_index + 1' at this point. */ 374 /* Let the new bss section address alignment be the same as
936 NEW_SECTION_H (nn).sh_offset = 375 * the section address alignment followed the old bss
937 NEW_SECTION_H (new_data2_index).sh_offset + new_data2_size; 376 * section, so this section will be placed in exactly the
938 NEW_SECTION_H (nn).sh_addr = 377 * same place. */
939 NEW_SECTION_H (new_data2_index).sh_addr + new_data2_size; 378 nsec->sh_addralign = osec->sh_addralign;
940 /* Let the new bss section address alignment be the same as the 379 nsec->sh_size = 0;
941 section address alignment followed the old bss section, so 380 } else {
942 this section will be placed in exactly the same place. */ 381 /* Any section that was originally placed AFTER the bss
943 NEW_SECTION_H (nn).sh_addralign = OLD_SECTION_H (nn).sh_addralign; 382 * section should now be off by NEW_DATA2_SIZE. */
944 NEW_SECTION_H (nn).sh_size = 0; 383 if ( round_up (nsec->sh_offset, growme->sh_addralign) >=
945 } 384 new_data2_offset)
946 else 385 nsec->sh_offset += new_data2_size;
947 { 386 }
948 /* Any section that was original placed AFTER the bss 387
949 section should now be off by NEW_DATA2_SIZE. */ 388 /* Any section that was originally placed after the section *
950 #ifdef SOLARIS_POWERPC 389 * header table should now be off by the size of one section
951 /* On PPC Reference Platform running Solaris 2.5.1 390 * header table entry. */
952 the plt section is also of type NOBI like the bss section. 391 if (nsec->sh_offset > new_file_h->e_shoff)
953 (not really stored) and therefore sections after the bss 392 nsec->sh_offset += new_file_h->e_shentsize;
954 section start at the plt offset. The plt section is always 393
955 the one just before the bss section.
956 It would be better to put the new data section before
957 the .plt section, or use libelf instead.
958 Erik Deumens, deumens@qtp.ufl.edu. */
959 if (NEW_SECTION_H (nn).sh_offset
960 >= OLD_SECTION_H (old_bss_index-1).sh_offset)
961 NEW_SECTION_H (nn).sh_offset += new_data2_size;
962 #else
963 if (round_up (NEW_SECTION_H (nn).sh_offset,
964 OLD_SECTION_H (old_bss_index).sh_addralign)
965 >= new_data2_offset)
966 NEW_SECTION_H (nn).sh_offset += new_data2_size;
967 #endif
968 /* Any section that was originally placed after the section
969 header table should now be off by the size of one section
970 header table entry. */
971 if (NEW_SECTION_H (nn).sh_offset > new_file_h->e_shoff)
972 NEW_SECTION_H (nn).sh_offset += new_file_h->e_shentsize;
973 }
974 394
975 /* If any section hdr refers to the section after the new .data 395 /* If any section hdr refers to the section after the new .data
976 section, make it refer to next one because we have inserted 396 * section, make it refer to next one because we have inserted a
977 a new section in between. */ 397 * new section in between. */
978 398 PATCH_INDEX (nsec->sh_link);
979 PATCH_INDEX (NEW_SECTION_H (nn).sh_link); 399
980 /* For symbol tables, info is a symbol table index, 400 /* For symbol tables, info is a symbol table index, so don't
981 so don't change it. */ 401 * change it. */
982 if (NEW_SECTION_H (nn).sh_type != SHT_SYMTAB 402 if (nsec->sh_type != SHT_SYMTAB && nsec->sh_type != SHT_DYNSYM)
983 && NEW_SECTION_H (nn).sh_type != SHT_DYNSYM) 403 PATCH_INDEX (nsec->sh_info);
984 PATCH_INDEX (NEW_SECTION_H (nn).sh_info); 404
985 405 /* Any section which used to be NOBITS will now becomes PROGBITS
986 if (old_sbss_index != -1) 406 * if it's ALLOC-atable, unless, of cause, it's not the one we
987 if (!strcmp (old_section_names + NEW_SECTION_H (nn).sh_name, ".sbss")) 407 * decided to grow */
988 { 408 if ( (osec->sh_type == SHT_NOBITS) && (osec->sh_flags & SHF_ALLOC) &&
989 NEW_SECTION_H (nn).sh_offset = 409 (osec != growme ) ) {
990 round_up (NEW_SECTION_H (nn).sh_offset, 410 nsec->sh_type = SHT_PROGBITS;
991 NEW_SECTION_H (nn).sh_addralign); 411 }
992 NEW_SECTION_H (nn).sh_type = SHT_PROGBITS; 412
413 /* Now, start to copy the content of sections */
414 if ( nsec->sh_type != SHT_NULL || nsec->sh_type != SHT_NOBITS ) {
415
416 /* Write out the sections. .data and .data1 (and data2,
417 * called ".data" in the strings table) get copied from the
418 * current process instead of the old file. */
419 caddr_t src = old_base + osec->sh_offset;
420 const char * secname = old_section_names + nsec->sh_name;
421 const char * names[] = {
422 ".data",".sdata", ".lit4", ".lit8", ".sdata1", ".data1",
423 ".sbss", NULL};
424 int i;
425
426 for ( i=0; names[i] != NULL; i++ ) {
427 if ( ! strcmp (secname, names[i]) ) {
428 src = (caddr_t) osec->sh_addr;
429 break;
430 }
993 } 431 }
994 432
995 /* Now, start to copy the content of sections. */ 433 memcpy (nsec->sh_offset + new_base, src, nsec->sh_size);
996 if (NEW_SECTION_H (nn).sh_type == SHT_NULL 434 }
997 || NEW_SECTION_H (nn).sh_type == SHT_NOBITS) 435
998 continue; 436 old_mdebug_index = find_section (".mdebug", old_section_names,
999 437 old_name, old_file_h, old_section_h, 1);
1000 /* Write out the sections. .data and .data1 (and data2, called
1001 ".data" in the strings table) get copied from the current process
1002 instead of the old file. */
1003 if (!strcmp (old_section_names + NEW_SECTION_H (n).sh_name, ".data")
1004 || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
1005 ".sdata")
1006 || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
1007 ".lit4")
1008 || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
1009 ".lit8")
1010 || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
1011 ".sdata1")
1012 || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
1013 ".data1")
1014 || !strcmp (old_section_names + NEW_SECTION_H (nn).sh_name,
1015 ".sbss"))
1016 src = (caddr_t) OLD_SECTION_H (n).sh_addr;
1017 else
1018 src = old_base + OLD_SECTION_H (n).sh_offset;
1019
1020 memcpy (NEW_SECTION_H (nn).sh_offset + new_base, src,
1021 NEW_SECTION_H (nn).sh_size);
1022
1023 #ifdef __alpha__
1024 /* Update Alpha COFF symbol table: */
1025 if (strcmp (old_section_names + OLD_SECTION_H (n).sh_name, ".mdebug")
1026 == 0)
1027 {
1028 pHDRR symhdr = (pHDRR) (NEW_SECTION_H (nn).sh_offset + new_base);
1029
1030 symhdr->cbLineOffset += new_data2_size;
1031 symhdr->cbDnOffset += new_data2_size;
1032 symhdr->cbPdOffset += new_data2_size;
1033 symhdr->cbSymOffset += new_data2_size;
1034 symhdr->cbOptOffset += new_data2_size;
1035 symhdr->cbAuxOffset += new_data2_size;
1036 symhdr->cbSsOffset += new_data2_size;
1037 symhdr->cbSsExtOffset += new_data2_size;
1038 symhdr->cbFdOffset += new_data2_size;
1039 symhdr->cbRfdOffset += new_data2_size;
1040 symhdr->cbExtOffset += new_data2_size;
1041 }
1042 #endif /* __alpha__ */
1043 438
1044 #if defined (__sony_news) && defined (_SYSTYPE_SYSV) 439 #if defined (__sony_news) && defined (_SYSTYPE_SYSV)
1045 if (NEW_SECTION_H (nn).sh_type == SHT_MIPS_DEBUG 440 if (nsec->sh_type == SHT_MIPS_DEBUG && old_mdebug_index != -1) {
1046 && old_mdebug_index != -1) 441 int diff = nsec->sh_offset-OLD_SECTION_H(old_mdebug_index).sh_offset;
1047 { 442 HDRR *phdr = (HDRR *)(nsec->sh_offset + new_base);
1048 int diff = NEW_SECTION_H(nn).sh_offset 443
1049 - OLD_SECTION_H(old_mdebug_index).sh_offset; 444 if (diff) {
1050 HDRR *phdr = (HDRR *)(NEW_SECTION_H (nn).sh_offset + new_base);
1051
1052 if (diff)
1053 {
1054 phdr->cbLineOffset += diff; 445 phdr->cbLineOffset += diff;
1055 phdr->cbDnOffset += diff; 446 phdr->cbDnOffset += diff;
1056 phdr->cbPdOffset += diff; 447 phdr->cbPdOffset += diff;
1057 phdr->cbSymOffset += diff; 448 phdr->cbSymOffset += diff;
1058 phdr->cbOptOffset += diff; 449 phdr->cbOptOffset += diff;
1060 phdr->cbSsOffset += diff; 451 phdr->cbSsOffset += diff;
1061 phdr->cbSsExtOffset += diff; 452 phdr->cbSsExtOffset += diff;
1062 phdr->cbFdOffset += diff; 453 phdr->cbFdOffset += diff;
1063 phdr->cbRfdOffset += diff; 454 phdr->cbRfdOffset += diff;
1064 phdr->cbExtOffset += diff; 455 phdr->cbExtOffset += diff;
1065 } 456 }
1066 } 457 }
1067 #endif /* __sony_news && _SYSTYPE_SYSV */ 458 #endif /* __sony_news && _SYSTYPE_SYSV */
1068 459
1069 #if __sgi 460 #if __sgi
1070 /* Adjust the HDRR offsets in .mdebug and copy the 461 /* Adjust the HDRR offsets in .mdebug and copy the line data if
1071 line data if it's in its usual 'hole' in the object. 462 * it's in its usual 'hole' in the object. Makes the new file
1072 Makes the new file debuggable with dbx. 463 * debuggable with dbx. patches up two problems: the absolute
1073 patches up two problems: the absolute file offsets 464 * file offsets in the HDRR record of .mdebug (see
1074 in the HDRR record of .mdebug (see /usr/include/syms.h), and 465 * /usr/include/syms.h), and the ld bug that gets the line table
1075 the ld bug that gets the line table in a hole in the 466 * in a hole in the elf file rather than in the .mdebug section
1076 elf file rather than in the .mdebug section proper. 467 * proper.
1077 David Anderson. davea@sgi.com Jan 16,1994. */ 468 *
1078 if (n == old_mdebug_index) 469 * David Anderson. davea@sgi.com Jan 16,1994 */
1079 {
1080 #define MDEBUGADJUST(__ct,__fileaddr) \ 470 #define MDEBUGADJUST(__ct,__fileaddr) \
1081 if (n_phdrr->__ct > 0) \ 471 if (n_phdrr->__ct > 0) \
1082 { \ 472 { \
1083 n_phdrr->__fileaddr += movement; \ 473 n_phdrr->__fileaddr += movement; \
1084 } 474 }
1085 475
1086 HDRR * o_phdrr = (HDRR *)((byte *)old_base + OLD_SECTION_H (n).sh_offset); 476 if (n == old_mdebug_index) {
1087 HDRR * n_phdrr = (HDRR *)((byte *)new_base + NEW_SECTION_H (nn).sh_offset); 477 HDRR * o_phdrr = (HDRR *)((byte *)old_base + osec->sh_offset);
478 HDRR * n_phdrr = (HDRR *)((byte *)new_base + nsec->sh_offset);
1088 unsigned movement = new_data2_size; 479 unsigned movement = new_data2_size;
1089 480
1090 MDEBUGADJUST (idnMax, cbDnOffset); 481 MDEBUGADJUST (idnMax, cbDnOffset);
1091 MDEBUGADJUST (ipdMax, cbPdOffset); 482 MDEBUGADJUST (ipdMax, cbPdOffset);
1092 MDEBUGADJUST (isymMax, cbSymOffset); 483 MDEBUGADJUST (isymMax, cbSymOffset);
1095 MDEBUGADJUST (issMax, cbSsOffset); 486 MDEBUGADJUST (issMax, cbSsOffset);
1096 MDEBUGADJUST (issExtMax, cbSsExtOffset); 487 MDEBUGADJUST (issExtMax, cbSsExtOffset);
1097 MDEBUGADJUST (ifdMax, cbFdOffset); 488 MDEBUGADJUST (ifdMax, cbFdOffset);
1098 MDEBUGADJUST (crfd, cbRfdOffset); 489 MDEBUGADJUST (crfd, cbRfdOffset);
1099 MDEBUGADJUST (iextMax, cbExtOffset); 490 MDEBUGADJUST (iextMax, cbExtOffset);
1100 /* The Line Section, being possible off in a hole of the object, 491
1101 requires special handling. */ 492 /* The Line Section, being possible off in a hole of the
1102 if (n_phdrr->cbLine > 0) 493 * object, requires special handling. */
1103 { 494 if (n_phdrr->cbLine > 0) {
1104 if (o_phdrr->cbLineOffset > (OLD_SECTION_H (n).sh_offset 495 if (o_phdrr->cbLineOffset >
1105 + OLD_SECTION_H (n).sh_size)) 496 osec->sh_offset+ osec->sh_size){
1106 { 497 /* line data is in a hole in elf. do special copy
1107 /* line data is in a hole in elf. do special copy and adjust 498 * and adjust for this ld mistake. */
1108 for this ld mistake.
1109 */
1110 n_phdrr->cbLineOffset += movement; 499 n_phdrr->cbLineOffset += movement;
1111 500
1112 memcpy (n_phdrr->cbLineOffset + new_base, 501 memcpy (n_phdrr->cbLineOffset + new_base,
1113 o_phdrr->cbLineOffset + old_base, n_phdrr->cbLine); 502 o_phdrr->cbLineOffset + old_base, n_phdrr->cbLine);
1114 } 503 } else {
1115 else 504 /* somehow line data is in .mdebug as it is supposed
1116 { 505 * to be. */
1117 /* somehow line data is in .mdebug as it is supposed to be. */
1118 MDEBUGADJUST (cbLine, cbLineOffset); 506 MDEBUGADJUST (cbLine, cbLineOffset);
1119 }
1120 }
1121 }
1122 #endif /* __sgi */
1123
1124 /* If it is the symbol table, its st_shndx field needs to be patched. */
1125 if (NEW_SECTION_H (nn).sh_type == SHT_SYMTAB
1126 || NEW_SECTION_H (nn).sh_type == SHT_DYNSYM)
1127 {
1128 ElfW(Shdr) *spt = &NEW_SECTION_H (nn);
1129 unsigned int num = spt->sh_size / spt->sh_entsize;
1130 ElfW(Sym) * sym = (ElfW(Sym) *) (NEW_SECTION_H (nn).sh_offset +
1131 new_base);
1132 for (; num--; sym++)
1133 {
1134 if ((sym->st_shndx == SHN_UNDEF)
1135 || (sym->st_shndx == SHN_ABS)
1136 || (sym->st_shndx == SHN_COMMON))
1137 continue;
1138
1139 PATCH_INDEX (sym->st_shndx);
1140 }
1141 }
1142 }
1143
1144 /* Update the symbol values of _edata and _end. */
1145 for (n = new_file_h->e_shnum - 1; n; n--)
1146 {
1147 byte *symnames;
1148 ElfW(Sym) *symp, *symendp;
1149
1150 if (NEW_SECTION_H (n).sh_type != SHT_DYNSYM
1151 && NEW_SECTION_H (n).sh_type != SHT_SYMTAB)
1152 continue;
1153
1154 symnames = ((byte *) new_base
1155 + NEW_SECTION_H (NEW_SECTION_H (n).sh_link).sh_offset);
1156 symp = (ElfW(Sym) *) (NEW_SECTION_H (n).sh_offset + new_base);
1157 symendp = (ElfW(Sym) *) ((byte *)symp + NEW_SECTION_H (n).sh_size);
1158
1159 for (; symp < symendp; symp ++)
1160 if (strcmp ((char *) (symnames + symp->st_name), "_end") == 0
1161 || strcmp ((char *) (symnames + symp->st_name), "end") == 0
1162 || strcmp ((char *) (symnames + symp->st_name), "_edata") == 0
1163 || strcmp ((char *) (symnames + symp->st_name), "edata") == 0)
1164 memcpy (&symp->st_value, &new_bss_addr, sizeof (new_bss_addr));
1165 }
1166
1167 /* This loop seeks out relocation sections for the data section, so
1168 that it can undo relocations performed by the runtime linker. */
1169 for (n = new_file_h->e_shnum - 1; n; n--)
1170 {
1171 ElfW(Shdr) section = NEW_SECTION_H (n);
1172 switch (section.sh_type) {
1173 default:
1174 break;
1175 case SHT_REL:
1176 case SHT_RELA:
1177 /* This code handles two different size structs, but there should
1178 be no harm in that provided that r_offset is always the first
1179 member. */
1180 nn = section.sh_info;
1181 if (!strcmp (old_section_names + NEW_SECTION_H (nn).sh_name, ".data")
1182 || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name),
1183 ".sdata")
1184 || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name),
1185 ".lit4")
1186 || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name),
1187 ".lit8")
1188 || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name),
1189 ".sdata1")
1190 || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name),
1191 ".data1"))
1192 {
1193 ElfW(Addr) offset = NEW_SECTION_H (nn).sh_addr -
1194 NEW_SECTION_H (nn).sh_offset;
1195 caddr_t reloc = old_base + section.sh_offset, end;
1196 for (end = reloc + section.sh_size; reloc < end;
1197 reloc += section.sh_entsize)
1198 {
1199 ElfW(Addr) addr = ((ElfW(Rel) *) reloc)->r_offset - offset;
1200 #ifdef __alpha__
1201 /* The Alpha ELF binutils currently have a bug that
1202 sometimes results in relocs that contain all
1203 zeroes. Work around this for now... */
1204 if (((ElfW(Rel) *) reloc)->r_offset == 0)
1205 continue;
1206 #endif
1207 memcpy (new_base + addr, old_base + addr, sizeof(ElfW(Addr)));
1208 } 507 }
1209 } 508 }
1210 break; 509 }
1211 } 510 #endif /* __sgi */
1212 } 511 /* If it is the symbol table, its st_shndx field needs to be
512 * patched. */
513 if (nsec->sh_type == SHT_SYMTAB || nsec->sh_type == SHT_DYNSYM) {
514 unsigned int num = nsec->sh_size / nsec->sh_entsize;
515 ElfW(Sym) * sym = (ElfW(Sym) *)(nsec->sh_offset + new_base);
516 byte *symnames = ((byte *) new_base +
517 NEW_SECTION_H (nsec->sh_link).sh_offset);
518
519 for (; num--; sym++) {
520 const char * symnam = (char *) (symnames + sym->st_name);
521
522 /* Update the symbol values of _edata and _end. */
523 if (strcmp (symnam, "_end") == 0
524 || strcmp (symnam, "end") == 0
525 || strcmp (symnam, "_edata") == 0
526 || strcmp (symnam, "edata") == 0)
527 memcpy (&sym->st_value, &new_bss_addr,sizeof (new_bss_addr));
528
529
530 if ((sym->st_shndx == SHN_UNDEF) || (sym->st_shndx == SHN_ABS)
531 || (sym->st_shndx == SHN_COMMON)
532 || (sym->st_shndx >= SHN_LOPROC &&
533 sym->st_shndx <= SHN_HIPROC))
534 continue;
535
536 PATCH_INDEX (sym->st_shndx);
537 }
538 }
539 }
540
541 /* This loop seeks out relocation sections for the data section, so
542 * that it can undo relocations performed by the runtime linker. */
543 for (n = new_file_h->e_shnum - 1; n; n--) {
544 ElfW(Shdr) section = NEW_SECTION_H (n);
545
546 if ( section.sh_type == SHT_REL || section.sh_type == SHT_RELA ) {
547 /* This code handles two different size structs, but there
548 * should be no harm in that provided that r_offset is
549 * always the first member. */
550 ElfW(Shdr) * info = & NEW_SECTION_H(section.sh_info);
551 const char * nm = old_section_names + info->sh_name;
552
553 if (!strcmp (nm, ".data") || !strcmp (nm, ".sdata")
554 || !strcmp (nm, ".lit4") || !strcmp (nm, ".lit8")
555 || !strcmp (nm, ".sdata1") || !strcmp (nm, ".data1")) {
556 ElfW(Addr) offset = info->sh_addr - info->sh_offset;
557 caddr_t end, reloc = old_base + section.sh_offset;
558
559 for (end = reloc + section.sh_size; reloc < end;
560 reloc += section.sh_entsize) {
561 ElfW(Addr) addr = ((ElfW(Rel) *) reloc)->r_offset - offset;
562 #ifdef __alpha__
563 /* The Alpha ELF binutils currently have a bug that
564 * sometimes results in relocs that contain all
565 * zeroes. Work around this for now... */
566 if (((ElfW(Rel) *) reloc)->r_offset == 0)
567 continue;
568 #endif
569 memcpy (new_base + addr, old_base + addr,
570 sizeof(ElfW(Addr)));
571 }
572 }
573 }
574 }
1213 575
1214 #ifdef UNEXEC_USE_MAP_PRIVATE 576 #ifdef UNEXEC_USE_MAP_PRIVATE
1215 if (lseek (new_file, 0, SEEK_SET) == -1) 577 if (lseek (new_file, 0, SEEK_SET) == -1)
1216 fatal ("Can't rewind (%s): errno %d\n", new_name, errno); 578 fatal ("Can't rewind (%s): errno %d\n", new_name, errno);
1217 579
1218 if (write (new_file, new_base, new_file_size) != new_file_size) 580 if (write (new_file, new_base, new_file_size) != new_file_size)
1219 fatal ("Can't write (%s): errno %d\n", new_name, errno); 581 fatal ("Can't write (%s): errno %d\n", new_name, errno);
1220 #endif 582 #endif
1221 583
1222 /* Close the files and make the new file executable. */ 584 /* Close the files and make the new file executable. */
1223
1224 if (close (old_file)) 585 if (close (old_file))
1225 fatal ("Can't close (%s): errno %d\n", old_name, errno); 586 fatal ("Can't close (%s): errno %d\n", old_name, errno);
1226 587
1227 if (close (new_file)) 588 if (close (new_file))
1228 fatal ("Can't close (%s): errno %d\n", new_name, errno); 589 fatal ("Can't close (%s): errno %d\n", new_name, errno);
1229 590
1230 if (stat (new_name, &stat_buf) == -1) 591 if (stat (new_name, &stat_buf) == -1)
1231 fatal ("Can't stat (%s): errno %d\n", new_name, errno); 592 fatal ("Can't stat (%s): errno %d\n", new_name, errno);
1232 593
1233 n = umask (777); 594 n = umask (777);
1234 umask (n); 595 umask (n);
1235 stat_buf.st_mode |= 0111 & ~n; 596 stat_buf.st_mode |= 0111 & ~n;
1236 if (chmod (new_name, stat_buf.st_mode) == -1) 597 if (chmod (new_name, stat_buf.st_mode) == -1)
1237 fatal ("Can't chmod (%s): errno %d\n", new_name, errno); 598 fatal ("Can't chmod (%s): errno %d\n", new_name, errno);
1238 } 599 }