Commit | Line | Data |
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f1913a26 | 1 | /* Unexec for Siemens machines running Sinix (modified SVR4). |
f8c25f1b | 2 | Copyright (C) 1985, 1986, 1987, 1988, 1990, 1992, 1993, 1994, 1995 |
f1913a26 RS |
3 | Free Software Foundation, Inc. |
4 | ||
3b7ad313 | 5 | This file is part of GNU Emacs. |
f1913a26 | 6 | |
3b7ad313 EN |
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. | |
f1913a26 | 11 | |
3b7ad313 EN |
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. | |
f1913a26 RS |
21 | |
22 | In other words, you are welcome to use, share and improve this program. | |
23 | You are forbidden to forbid anyone else to use, share and improve | |
24 | what you give them. Help stamp out software-hoarding! */ | |
25 | ||
26 | ||
27 | /* | |
28 | * unexec.c - Convert a running program into an a.out file. | |
29 | * | |
30 | * Author: Spencer W. Thomas | |
31 | * Computer Science Dept. | |
32 | * University of Utah | |
33 | * Date: Tue Mar 2 1982 | |
34 | * Modified heavily since then. | |
35 | * | |
36 | * Synopsis: | |
37 | * unexec (new_name, a_name, data_start, bss_start, entry_address) | |
38 | * char *new_name, *a_name; | |
39 | * unsigned data_start, bss_start, entry_address; | |
40 | * | |
41 | * Takes a snapshot of the program and makes an a.out format file in the | |
42 | * file named by the string argument new_name. | |
43 | * If a_name is non-NULL, the symbol table will be taken from the given file. | |
44 | * On some machines, an existing a_name file is required. | |
45 | * | |
46 | * The boundaries within the a.out file may be adjusted with the data_start | |
47 | * and bss_start arguments. Either or both may be given as 0 for defaults. | |
48 | * | |
49 | * Data_start gives the boundary between the text segment and the data | |
50 | * segment of the program. The text segment can contain shared, read-only | |
51 | * program code and literal data, while the data segment is always unshared | |
52 | * and unprotected. Data_start gives the lowest unprotected address. | |
53 | * The value you specify may be rounded down to a suitable boundary | |
54 | * as required by the machine you are using. | |
55 | * | |
56 | * Specifying zero for data_start means the boundary between text and data | |
57 | * should not be the same as when the program was loaded. | |
58 | * If NO_REMAP is defined, the argument data_start is ignored and the | |
59 | * segment boundaries are never changed. | |
60 | * | |
61 | * Bss_start indicates how much of the data segment is to be saved in the | |
62 | * a.out file and restored when the program is executed. It gives the lowest | |
63 | * unsaved address, and is rounded up to a page boundary. The default when 0 | |
64 | * is given assumes that the entire data segment is to be stored, including | |
65 | * the previous data and bss as well as any additional storage allocated with | |
66 | * break (2). | |
67 | * | |
68 | * The new file is set up to start at entry_address. | |
69 | * | |
70 | * If you make improvements I'd like to get them too. | |
71 | * harpo!utah-cs!thomas, thomas@Utah-20 | |
72 | * | |
73 | */ | |
74 | ||
75 | /* Even more heavily modified by james@bigtex.cactus.org of Dell Computer Co. | |
76 | * ELF support added. | |
77 | * | |
78 | * Basic theory: the data space of the running process needs to be | |
79 | * dumped to the output file. Normally we would just enlarge the size | |
80 | * of .data, scooting everything down. But we can't do that in ELF, | |
81 | * because there is often something between the .data space and the | |
82 | * .bss space. | |
83 | * | |
84 | * In the temacs dump below, notice that the Global Offset Table | |
85 | * (.got) and the Dynamic link data (.dynamic) come between .data1 and | |
86 | * .bss. It does not work to overlap .data with these fields. | |
87 | * | |
88 | * The solution is to create a new .data segment. This segment is | |
89 | * filled with data from the current process. Since the contents of | |
90 | * various sections refer to sections by index, the new .data segment | |
91 | * is made the last in the table to avoid changing any existing index. | |
92 | */ | |
93 | ||
94 | /* Modified by wtien@urbana.mcd.mot.com of Motorola Inc. | |
95 | * | |
96 | * The above mechanism does not work if the unexeced ELF file is being | |
97 | * re-layout by other applications (such as `strip'). All the applications | |
98 | * that re-layout the internal of ELF will layout all sections in ascending | |
99 | * order of their file offsets. After the re-layout, the data2 section will | |
100 | * still be the LAST section in the section header vector, but its file offset | |
101 | * is now being pushed far away down, and causes part of it not to be mapped | |
102 | * in (ie. not covered by the load segment entry in PHDR vector), therefore | |
103 | * causes the new binary to fail. | |
104 | * | |
105 | * The solution is to modify the unexec algorithm to insert the new data2 | |
106 | * section header right before the new bss section header, so their file | |
107 | * offsets will be in the ascending order. Since some of the section's (all | |
108 | * sections AFTER the bss section) indexes are now changed, we also need to | |
109 | * modify some fields to make them point to the right sections. This is done | |
110 | * by macro PATCH_INDEX. All the fields that need to be patched are: | |
111 | * | |
112 | * 1. ELF header e_shstrndx field. | |
113 | * 2. section header sh_link and sh_info field. | |
114 | * 3. symbol table entry st_shndx field. | |
115 | */ | |
116 | ||
117 | /* | |
118 | * New modifications for Siemens Nixdorf's MIPS-based machines. | |
119 | * Marco.Walther@mch.sni.de | |
120 | * | |
121 | * The problem: Before the bss segment we have a so called sbss segment | |
122 | * (small bss) and maybe an sdata segment. These segments | |
123 | * must also be handled correct. | |
124 | * | |
125 | * /home1/marco/emacs/emacs-19.22/src | |
126 | * dump -hv temacs | |
127 | * | |
128 | * temacs: | |
129 | * | |
130 | * **** SECTION HEADER TABLE **** | |
131 | * [No] Type Flags Addr Offset Size Name | |
132 | * Link Info Adralgn Entsize | |
133 | * | |
134 | * [1] PBIT -A-- 0x4000f4 0xf4 0x13 .interp | |
135 | * 0 0 0x1 0 | |
136 | * | |
137 | * [2] REGI -A-- 0x400108 0x108 0x18 .reginfo | |
138 | * 0 0 0x4 0x18 | |
139 | * | |
140 | * [3] DYNM -A-- 0x400120 0x120 0xb8 .dynamic | |
141 | * 6 0 0x4 0x8 | |
142 | * | |
143 | * [4] HASH -A-- 0x4001d8 0x1d8 0x8a0 .hash | |
144 | * 5 0 0x4 0x4 | |
145 | * | |
146 | * [5] DYNS -A-- 0x400a78 0xa78 0x11f0 .dynsym | |
147 | * 6 2 0x4 0x10 | |
148 | * | |
149 | * [6] STRT -A-- 0x401c68 0x1c68 0xbf9 .dynstr | |
150 | * 0 0 0x1 0 | |
151 | * | |
152 | * [7] REL -A-- 0x402864 0x2864 0x18 .rel.dyn | |
153 | * 5 14 0x4 0x8 | |
154 | * | |
155 | * [8] PBIT -AI- 0x402880 0x2880 0x60 .init | |
156 | * 0 0 0x10 0x1 | |
157 | * | |
158 | * [9] PBIT -AI- 0x4028e0 0x28e0 0x1234 .plt | |
159 | * 0 0 0x4 0x4 | |
160 | * | |
161 | * [10] PBIT -AI- 0x403b20 0x3b20 0xee400 .text | |
162 | * 0 0 0x20 0x1 | |
163 | * | |
164 | * [11] PBIT -AI- 0x4f1f20 0xf1f20 0x60 .fini | |
165 | * 0 0 0x10 0x1 | |
166 | * | |
167 | * [12] PBIT -A-- 0x4f1f80 0xf1f80 0xd90 .rdata | |
168 | * 0 0 0x10 0x1 | |
169 | * | |
170 | * [13] PBIT -A-- 0x4f2d10 0xf2d10 0x17e0 .rodata | |
171 | * 0 0 0x10 0x1 | |
172 | * | |
173 | * [14] PBIT WA-- 0x5344f0 0xf44f0 0x4b3e4 .data <<<<< | |
174 | * 0 0 0x10 0x1 | |
175 | * | |
176 | * [15] PBIT WA-G 0x57f8d4 0x13f8d4 0x2a84 .got | |
177 | * 0 0 0x4 0x4 | |
178 | * | |
179 | * [16] PBIT WA-G 0x582360 0x142360 0x10 .sdata <<<<< | |
180 | * 0 0 0x10 0x1 | |
181 | * | |
182 | * [17] NOBI WA-G 0x582370 0x142370 0xb84 .sbss <<<<< | |
183 | * 0 0 0x4 0 | |
184 | * | |
185 | * [18] NOBI WA-- 0x582f00 0x142370 0x27ec0 .bss <<<<< | |
186 | * 0 0 0x10 0x1 | |
187 | * | |
188 | * [19] SYMT ---- 0 0x142370 0x10e40 .symtab | |
189 | * 20 1108 0x4 0x10 | |
190 | * | |
191 | * [20] STRT ---- 0 0x1531b0 0xed9e .strtab | |
192 | * 0 0 0x1 0 | |
193 | * | |
194 | * [21] STRT ---- 0 0x161f4e 0xb5 .shstrtab | |
195 | * 0 0 0x1 0 | |
196 | * | |
197 | * [22] PBIT ---- 0 0x162003 0x28e2a .comment | |
198 | * 0 0 0x1 0x1 | |
199 | * | |
200 | * [23] PBIT ---- 0 0x18ae2d 0x592 .debug | |
201 | * 0 0 0x1 0 | |
202 | * | |
203 | * [24] PBIT ---- 0 0x18b3bf 0x80 .line | |
204 | * 0 0 0x1 0 | |
205 | * | |
206 | * [25] MDBG ---- 0 0x18b440 0x60 .mdebug | |
207 | * 0 0 0x4 0 | |
208 | * | |
209 | * | |
210 | * dump -hv emacs | |
211 | * | |
212 | * emacs: | |
213 | * | |
214 | * **** SECTION HEADER TABLE **** | |
215 | * [No] Type Flags Addr Offset Size Name | |
216 | * Link Info Adralgn Entsize | |
217 | * | |
218 | * [1] PBIT -A-- 0x4000f4 0xf4 0x13 .interp | |
219 | * 0 0 0x1 0 | |
220 | * | |
221 | * [2] REGI -A-- 0x400108 0x108 0x18 .reginfo | |
222 | * 0 0 0x4 0x18 | |
223 | * | |
224 | * [3] DYNM -A-- 0x400120 0x120 0xb8 .dynamic | |
225 | * 6 0 0x4 0x8 | |
226 | * | |
227 | * [4] HASH -A-- 0x4001d8 0x1d8 0x8a0 .hash | |
228 | * 5 0 0x4 0x4 | |
229 | * | |
230 | * [5] DYNS -A-- 0x400a78 0xa78 0x11f0 .dynsym | |
231 | * 6 2 0x4 0x10 | |
232 | * | |
233 | * [6] STRT -A-- 0x401c68 0x1c68 0xbf9 .dynstr | |
234 | * 0 0 0x1 0 | |
235 | * | |
236 | * [7] REL -A-- 0x402864 0x2864 0x18 .rel.dyn | |
237 | * 5 14 0x4 0x8 | |
238 | * | |
239 | * [8] PBIT -AI- 0x402880 0x2880 0x60 .init | |
240 | * 0 0 0x10 0x1 | |
241 | * | |
242 | * [9] PBIT -AI- 0x4028e0 0x28e0 0x1234 .plt | |
243 | * 0 0 0x4 0x4 | |
244 | * | |
245 | * [10] PBIT -AI- 0x403b20 0x3b20 0xee400 .text | |
246 | * 0 0 0x20 0x1 | |
247 | * | |
248 | * [11] PBIT -AI- 0x4f1f20 0xf1f20 0x60 .fini | |
249 | * 0 0 0x10 0x1 | |
250 | * | |
251 | * [12] PBIT -A-- 0x4f1f80 0xf1f80 0xd90 .rdata | |
252 | * 0 0 0x10 0x1 | |
253 | * | |
254 | * [13] PBIT -A-- 0x4f2d10 0xf2d10 0x17e0 .rodata | |
255 | * 0 0 0x10 0x1 | |
256 | * | |
257 | * [14] PBIT WA-- 0x5344f0 0xf44f0 0x4b3e4 .data <<<<< | |
258 | * 0 0 0x10 0x1 | |
259 | * | |
260 | * [15] PBIT WA-G 0x57f8d4 0x13f8d4 0x2a84 .got | |
261 | * 0 0 0x4 0x4 | |
262 | * | |
263 | * [16] PBIT WA-G 0x582360 0x142360 0xb94 .sdata <<<<< | |
264 | * 0 0 0x10 0x1 | |
265 | * | |
266 | * [17] PBIT WA-- 0x582f00 0x142f00 0x94100 .data <<<<< | |
267 | * 0 0 0x10 0x1 | |
268 | * | |
269 | * [18] NOBI WA-G 0x617000 0x1d7000 0 .sbss <<<<< | |
270 | * 0 0 0x4 0 | |
271 | * | |
272 | * [19] NOBI WA-- 0x617000 0x1d7000 0 .bss <<<<< | |
273 | * 0 0 0x4 0x1 | |
274 | * | |
275 | * [20] SYMT ---- 0 0x1d7000 0x10e40 .symtab | |
276 | * 21 1109 0x4 0x10 | |
277 | * | |
278 | * [21] STRT ---- 0 0x1e7e40 0xed9e .strtab | |
279 | * 0 0 0x1 0 | |
280 | * | |
281 | * [22] STRT ---- 0 0x1f6bde 0xb5 .shstrtab | |
282 | * 0 0 0x1 0 | |
283 | * | |
284 | * [23] PBIT ---- 0 0x1f6c93 0x28e2a .comment | |
285 | * 0 0 0x1 0x1 | |
286 | * | |
287 | * [24] PBIT ---- 0 0x21fabd 0x592 .debug | |
288 | * 0 0 0x1 0 | |
289 | * | |
290 | * [25] PBIT ---- 0 0x22004f 0x80 .line | |
291 | * 0 0 0x1 0 | |
292 | * | |
293 | * [26] MDBG ---- 0 0x2200d0 0x60 .mdebug | |
294 | * 0 0 0x4 0 | |
295 | * | |
296 | */ | |
297 | \f | |
298 | #include <sys/types.h> | |
299 | #include <stdio.h> | |
300 | #include <sys/stat.h> | |
301 | #include <memory.h> | |
302 | #include <string.h> | |
303 | #include <errno.h> | |
304 | #include <unistd.h> | |
305 | #include <fcntl.h> | |
306 | #include <elf.h> | |
307 | #include <sys/mman.h> | |
308 | ||
309 | #ifndef emacs | |
310 | #define fatal(a, b, c) fprintf(stderr, a, b, c), exit(1) | |
311 | #else | |
312 | extern void fatal(char *, ...); | |
313 | #endif | |
314 | ||
315 | /* Get the address of a particular section or program header entry, | |
316 | * accounting for the size of the entries. | |
317 | */ | |
318 | ||
319 | #define OLD_SECTION_H(n) \ | |
320 | (*(Elf32_Shdr *) ((byte *) old_section_h + old_file_h->e_shentsize * (n))) | |
321 | #define NEW_SECTION_H(n) \ | |
322 | (*(Elf32_Shdr *) ((byte *) new_section_h + new_file_h->e_shentsize * (n))) | |
323 | #define OLD_PROGRAM_H(n) \ | |
324 | (*(Elf32_Phdr *) ((byte *) old_program_h + old_file_h->e_phentsize * (n))) | |
325 | #define NEW_PROGRAM_H(n) \ | |
326 | (*(Elf32_Phdr *) ((byte *) new_program_h + new_file_h->e_phentsize * (n))) | |
327 | ||
328 | #define PATCH_INDEX(n) \ | |
329 | do { \ | |
330 | if ((n) >= old_sbss_index) \ | |
331 | (n) += 1 + (old_sdata_index ? 0 : 1); } while (0) | |
332 | ||
333 | typedef unsigned char byte; | |
334 | ||
335 | /* Round X up to a multiple of Y. */ | |
336 | ||
337 | int | |
338 | round_up (x, y) | |
339 | int x, y; | |
340 | { | |
341 | int rem = x % y; | |
342 | if (rem == 0) | |
343 | return x; | |
344 | return x - rem + y; | |
345 | } | |
346 | ||
347 | /* **************************************************************** | |
348 | * unexec | |
349 | * | |
350 | * driving logic. | |
351 | * | |
352 | * In ELF, this works by replacing the old .bss section with a new | |
353 | * .data section, and inserting an empty .bss immediately afterwards. | |
354 | * | |
355 | */ | |
356 | void | |
357 | unexec (new_name, old_name, data_start, bss_start, entry_address) | |
358 | char *new_name, *old_name; | |
359 | unsigned data_start, bss_start, entry_address; | |
360 | { | |
361 | extern unsigned int bss_end; | |
362 | int new_file, old_file, new_file_size; | |
363 | ||
364 | /* Pointers to the base of the image of the two files. */ | |
365 | caddr_t old_base, new_base; | |
366 | ||
367 | /* Pointers to the file, program and section headers for the old and new | |
368 | * files. | |
369 | */ | |
370 | Elf32_Ehdr *old_file_h, *new_file_h; | |
371 | Elf32_Phdr *old_program_h, *new_program_h; | |
372 | Elf32_Shdr *old_section_h, *new_section_h; | |
373 | ||
374 | /* Point to the section name table in the old file */ | |
375 | char *old_section_names; | |
376 | ||
377 | Elf32_Addr old_bss_addr, new_bss_addr; | |
378 | Elf32_Addr old_sbss_addr; | |
379 | Elf32_Word old_bss_size, new_data2_size; | |
380 | Elf32_Word old_sbss_size, new_data3_size; | |
381 | Elf32_Off new_data2_offset; | |
382 | Elf32_Off new_data3_offset; | |
383 | Elf32_Addr new_data2_addr; | |
384 | Elf32_Addr new_data3_addr; | |
385 | ||
386 | Elf32_Word old_sdata_size, new_sdata_size; | |
387 | int old_sdata_index = 0; | |
388 | ||
389 | int n, nn, old_data_index, new_data2_align; | |
390 | int old_bss_index; | |
391 | int old_sbss_index; | |
392 | int old_bss_padding; | |
393 | struct stat stat_buf; | |
394 | ||
395 | /* Open the old file & map it into the address space. */ | |
396 | ||
397 | old_file = open (old_name, O_RDONLY); | |
398 | ||
399 | if (old_file < 0) | |
400 | fatal ("Can't open %s for reading: errno %d\n", old_name, errno); | |
401 | ||
402 | if (fstat (old_file, &stat_buf) == -1) | |
403 | fatal ("Can't fstat(%s): errno %d\n", old_name, errno); | |
404 | ||
405 | old_base = mmap (0, stat_buf.st_size, PROT_READ, MAP_SHARED, old_file, 0); | |
406 | ||
407 | if (old_base == (caddr_t) -1) | |
408 | fatal ("Can't mmap(%s): errno %d\n", old_name, errno); | |
409 | ||
410 | #ifdef DEBUG | |
411 | fprintf (stderr, "mmap(%s, %x) -> %x\n", old_name, stat_buf.st_size, | |
412 | old_base); | |
413 | #endif | |
414 | ||
415 | /* Get pointers to headers & section names */ | |
416 | ||
417 | old_file_h = (Elf32_Ehdr *) old_base; | |
418 | old_program_h = (Elf32_Phdr *) ((byte *) old_base + old_file_h->e_phoff); | |
419 | old_section_h = (Elf32_Shdr *) ((byte *) old_base + old_file_h->e_shoff); | |
420 | old_section_names = (char *) old_base | |
421 | + OLD_SECTION_H(old_file_h->e_shstrndx).sh_offset; | |
422 | ||
423 | /* Find the old .sbss section. | |
424 | */ | |
425 | ||
426 | for (old_sbss_index = 1; old_sbss_index < old_file_h->e_shnum; | |
427 | old_sbss_index++) | |
428 | { | |
429 | #ifdef DEBUG | |
430 | fprintf (stderr, "Looking for .sbss - found %s\n", | |
431 | old_section_names + OLD_SECTION_H(old_sbss_index).sh_name); | |
432 | #endif | |
433 | if (!strcmp (old_section_names + OLD_SECTION_H(old_sbss_index).sh_name, | |
434 | ".sbss")) | |
435 | break; | |
436 | } | |
437 | if (old_sbss_index == old_file_h->e_shnum) | |
438 | fatal ("Can't find .sbss in %s.\n", old_name, 0); | |
439 | ||
440 | if (!strcmp(old_section_names + OLD_SECTION_H(old_sbss_index - 1).sh_name, | |
441 | ".sdata")) | |
442 | { | |
443 | old_sdata_index = old_sbss_index - 1; | |
444 | } | |
445 | ||
446 | ||
447 | /* Find the old .bss section. | |
448 | */ | |
449 | ||
450 | for (old_bss_index = 1; old_bss_index < old_file_h->e_shnum; old_bss_index++) | |
451 | { | |
452 | #ifdef DEBUG | |
453 | fprintf (stderr, "Looking for .bss - found %s\n", | |
454 | old_section_names + OLD_SECTION_H(old_bss_index).sh_name); | |
455 | #endif | |
456 | if (!strcmp (old_section_names + OLD_SECTION_H(old_bss_index).sh_name, | |
457 | ".bss")) | |
458 | break; | |
459 | } | |
460 | if (old_bss_index == old_file_h->e_shnum) | |
461 | fatal ("Can't find .bss in %s.\n", old_name, 0); | |
462 | ||
463 | if (old_sbss_index != (old_bss_index - 1)) | |
b75dac61 | 464 | fatal (".sbss should come immediately before .bss in %s.\n", old_name, 0); |
f1913a26 RS |
465 | |
466 | /* Figure out parameters of the new data3 and data2 sections. | |
467 | * Change the sbss and bss sections. | |
468 | */ | |
469 | ||
470 | old_bss_addr = OLD_SECTION_H(old_bss_index).sh_addr; | |
471 | old_bss_size = OLD_SECTION_H(old_bss_index).sh_size; | |
472 | ||
473 | old_sbss_addr = OLD_SECTION_H(old_sbss_index).sh_addr; | |
474 | old_sbss_size = OLD_SECTION_H(old_sbss_index).sh_size; | |
475 | ||
476 | if (old_sdata_index) | |
477 | { | |
478 | old_sdata_size = OLD_SECTION_H(old_sdata_index).sh_size; | |
479 | } | |
480 | ||
481 | #if defined(emacs) || !defined(DEBUG) | |
482 | bss_end = (unsigned int) sbrk (0); | |
483 | new_bss_addr = (Elf32_Addr) bss_end; | |
484 | #else | |
485 | new_bss_addr = old_bss_addr + old_bss_size + 0x1234; | |
486 | #endif | |
487 | if (old_sdata_index) | |
488 | { | |
489 | new_sdata_size = OLD_SECTION_H(old_sbss_index).sh_offset - | |
490 | OLD_SECTION_H(old_sdata_index).sh_offset + old_sbss_size; | |
491 | } | |
492 | ||
493 | new_data3_addr = old_sbss_addr; | |
494 | new_data3_size = old_sbss_size; | |
495 | new_data3_offset = OLD_SECTION_H(old_sbss_index).sh_offset; | |
496 | ||
497 | new_data2_addr = old_bss_addr; | |
498 | new_data2_size = new_bss_addr - old_bss_addr; | |
499 | new_data2_align = (new_data3_offset + old_sbss_size) % | |
500 | OLD_SECTION_H(old_bss_index).sh_addralign; | |
501 | new_data2_align = new_data2_align ? | |
502 | OLD_SECTION_H(old_bss_index).sh_addralign - new_data2_align : | |
503 | 0; | |
504 | new_data2_offset = new_data3_offset + old_sbss_size + new_data2_align; | |
505 | ||
506 | old_bss_padding = OLD_SECTION_H(old_bss_index).sh_offset - | |
507 | OLD_SECTION_H(old_sbss_index).sh_offset; | |
508 | #ifdef DEBUG | |
509 | fprintf (stderr, "old_bss_index %d\n", old_bss_index); | |
510 | fprintf (stderr, "old_bss_addr %x\n", old_bss_addr); | |
511 | fprintf (stderr, "old_bss_size %x\n", old_bss_size); | |
512 | fprintf (stderr, "new_bss_addr %x\n", new_bss_addr); | |
513 | fprintf (stderr, "new_data2_addr %x\n", new_data2_addr); | |
514 | fprintf (stderr, "new_data2_size %x\n", new_data2_size); | |
515 | fprintf (stderr, "new_data2_offset %x\n", new_data2_offset); | |
516 | fprintf (stderr, "old_sbss_index %d\n", old_sbss_index); | |
517 | fprintf (stderr, "old_sbss_addr %x\n", old_sbss_addr); | |
518 | fprintf (stderr, "old_sbss_size %x\n", old_sbss_size); | |
519 | if (old_sdata_index) | |
520 | { | |
521 | fprintf (stderr, "old_sdata_size %x\n", old_sdata_size); | |
522 | fprintf (stderr, "new_sdata_size %x\n", new_sdata_size); | |
523 | } | |
524 | else | |
525 | { | |
526 | fprintf (stderr, "new_data3_addr %x\n", new_data3_addr); | |
527 | fprintf (stderr, "new_data3_size %x\n", new_data3_size); | |
528 | fprintf (stderr, "new_data3_offset %x\n", new_data3_offset); | |
529 | } | |
530 | #endif | |
531 | ||
532 | if ((unsigned) new_bss_addr < (unsigned) old_bss_addr + old_bss_size) | |
533 | fatal (".bss shrank when undumping???\n", 0, 0); | |
534 | ||
535 | /* Set the output file to the right size and mmap(2) it. Set | |
536 | * pointers to various interesting objects. stat_buf still has | |
537 | * old_file data. | |
538 | */ | |
539 | ||
540 | new_file = open (new_name, O_RDWR | O_CREAT, 0666); | |
541 | if (new_file < 0) | |
542 | fatal ("Can't creat(%s): errno %d\n", new_name, errno); | |
543 | ||
544 | new_file_size = stat_buf.st_size + | |
545 | ((1 + (old_sdata_index ? 0 : 1)) * old_file_h->e_shentsize) + | |
546 | new_data2_size + new_data3_size + new_data2_align; | |
547 | ||
548 | if (ftruncate (new_file, new_file_size)) | |
549 | fatal ("Can't ftruncate(%s): errno %d\n", new_name, errno); | |
550 | ||
551 | new_base = mmap (0, new_file_size, PROT_READ | PROT_WRITE, MAP_SHARED, | |
552 | new_file, 0); | |
553 | ||
554 | if (new_base == (caddr_t) -1) | |
555 | fatal ("Can't mmap(%s): errno %d\n", new_name, errno); | |
556 | ||
557 | new_file_h = (Elf32_Ehdr *) new_base; | |
558 | new_program_h = (Elf32_Phdr *) ((byte *) new_base + old_file_h->e_phoff); | |
559 | new_section_h = (Elf32_Shdr *) ((byte *) new_base + | |
560 | old_file_h->e_shoff + | |
561 | new_data2_size + | |
562 | new_data2_align + | |
563 | new_data3_size); | |
564 | ||
565 | /* Make our new file, program and section headers as copies of the | |
566 | * originals. | |
567 | */ | |
568 | ||
569 | memcpy (new_file_h, old_file_h, old_file_h->e_ehsize); | |
570 | memcpy (new_program_h, old_program_h, | |
571 | old_file_h->e_phnum * old_file_h->e_phentsize); | |
572 | ||
573 | /* Modify the e_shstrndx if necessary. */ | |
574 | PATCH_INDEX (new_file_h->e_shstrndx); | |
575 | ||
576 | /* Fix up file header. We'll add one section. Section header is | |
577 | * further away now. | |
578 | */ | |
579 | ||
580 | new_file_h->e_shoff += new_data2_size + new_data2_align + new_data3_size; | |
581 | new_file_h->e_shnum += 1 + (old_sdata_index ? 0 : 1); | |
582 | ||
583 | #ifdef DEBUG | |
584 | fprintf (stderr, "Old section offset %x\n", old_file_h->e_shoff); | |
585 | fprintf (stderr, "Old section count %d\n", old_file_h->e_shnum); | |
586 | fprintf (stderr, "New section offset %x\n", new_file_h->e_shoff); | |
587 | fprintf (stderr, "New section count %d\n", new_file_h->e_shnum); | |
588 | #endif | |
589 | ||
590 | /* Fix up a new program header. Extend the writable data segment so | |
591 | * that the bss area is covered too. Find that segment by looking | |
592 | * for a segment that ends just before the .bss area. Make sure | |
593 | * that no segments are above the new .data2. Put a loop at the end | |
594 | * to adjust the offset and address of any segment that is above | |
595 | * data2, just in case we decide to allow this later. | |
596 | */ | |
597 | ||
598 | for (n = new_file_h->e_phnum - 1; n >= 0; n--) | |
599 | { | |
600 | /* Compute maximum of all requirements for alignment of section. */ | |
601 | int alignment = (NEW_PROGRAM_H (n)).p_align; | |
602 | if ((OLD_SECTION_H (old_bss_index)).sh_addralign > alignment) | |
603 | alignment = OLD_SECTION_H (old_bss_index).sh_addralign; | |
604 | ||
605 | if ((OLD_SECTION_H (old_sbss_index)).sh_addralign > alignment) | |
606 | alignment = OLD_SECTION_H (old_sbss_index).sh_addralign; | |
607 | ||
608 | /* Supposedly this condition is okay for the SGI. */ | |
609 | #if 0 | |
610 | if (NEW_PROGRAM_H(n).p_vaddr + NEW_PROGRAM_H(n).p_filesz > old_bss_addr) | |
611 | fatal ("Program segment above .bss in %s\n", old_name, 0); | |
612 | #endif | |
613 | ||
614 | if (NEW_PROGRAM_H(n).p_type == PT_LOAD | |
615 | && (round_up ((NEW_PROGRAM_H (n)).p_vaddr | |
616 | + (NEW_PROGRAM_H (n)).p_filesz, | |
617 | alignment) | |
618 | == round_up (old_bss_addr, alignment))) | |
619 | break; | |
620 | } | |
621 | if (n < 0) | |
622 | fatal ("Couldn't find segment next to .bss in %s\n", old_name, 0); | |
623 | ||
624 | NEW_PROGRAM_H(n).p_filesz += new_data2_size + new_data2_align + | |
625 | new_data3_size; | |
626 | NEW_PROGRAM_H(n).p_memsz = NEW_PROGRAM_H(n).p_filesz; | |
627 | ||
628 | #if 1 /* Maybe allow section after data2 - does this ever happen? */ | |
629 | for (n = new_file_h->e_phnum - 1; n >= 0; n--) | |
630 | { | |
631 | if (NEW_PROGRAM_H(n).p_vaddr | |
632 | && NEW_PROGRAM_H(n).p_vaddr >= new_data3_addr) | |
633 | NEW_PROGRAM_H(n).p_vaddr += new_data2_size - old_bss_size + | |
634 | new_data3_size - old_sbss_size; | |
635 | ||
636 | if (NEW_PROGRAM_H(n).p_offset >= new_data3_offset) | |
637 | NEW_PROGRAM_H(n).p_offset += new_data2_size + new_data2_align + | |
638 | new_data3_size; | |
639 | } | |
640 | #endif | |
641 | ||
642 | /* Fix up section headers based on new .data2 section. Any section | |
643 | * whose offset or virtual address is after the new .data2 section | |
644 | * gets its value adjusted. .bss size becomes zero and new address | |
645 | * is set. data2 section header gets added by copying the existing | |
646 | * .data header and modifying the offset, address and size. | |
647 | */ | |
648 | for (old_data_index = 1; old_data_index < old_file_h->e_shnum; | |
649 | old_data_index++) | |
650 | if (!strcmp (old_section_names + OLD_SECTION_H(old_data_index).sh_name, | |
651 | ".data")) | |
652 | break; | |
653 | if (old_data_index == old_file_h->e_shnum) | |
654 | fatal ("Can't find .data in %s.\n", old_name, 0); | |
655 | ||
656 | /* Walk through all section headers, insert the new data2 section right | |
657 | before the new bss section. */ | |
658 | for (n = 1, nn = 1; n < old_file_h->e_shnum; n++, nn++) | |
659 | { | |
660 | caddr_t src; | |
661 | ||
662 | if (n == old_sbss_index) | |
663 | ||
664 | /* If it is sbss section, insert the new data3 section before it. */ | |
665 | { | |
666 | /* Steal the data section header for this data3 section. */ | |
667 | if (!old_sdata_index) | |
668 | { | |
669 | memcpy (&NEW_SECTION_H(nn), &OLD_SECTION_H(old_data_index), | |
670 | new_file_h->e_shentsize); | |
671 | ||
672 | NEW_SECTION_H(nn).sh_addr = new_data3_addr; | |
673 | NEW_SECTION_H(nn).sh_offset = new_data3_offset; | |
674 | NEW_SECTION_H(nn).sh_size = new_data3_size; | |
675 | NEW_SECTION_H(nn).sh_flags = OLD_SECTION_H(n).sh_flags; | |
676 | /* Use the sbss section's alignment. This will assure that the | |
677 | new data3 section always be placed in the same spot as the old | |
678 | sbss section by any other application. */ | |
679 | NEW_SECTION_H(nn).sh_addralign = OLD_SECTION_H(n).sh_addralign; | |
680 | ||
681 | /* Now copy over what we have in the memory now. */ | |
682 | memcpy (NEW_SECTION_H(nn).sh_offset + new_base, | |
683 | (caddr_t) OLD_SECTION_H(n).sh_addr, | |
684 | new_data3_size); | |
685 | /* the new .data2 section should also come before the | |
686 | * new .sbss section */ | |
687 | nn += 2; | |
688 | } | |
689 | else | |
690 | { | |
691 | /* We always have a .sdata section: append the contents of the | |
692 | * old .sbss section. | |
693 | */ | |
694 | memcpy (new_data3_offset + new_base, | |
695 | (caddr_t) OLD_SECTION_H(n).sh_addr, | |
696 | new_data3_size); | |
697 | nn ++; | |
698 | } | |
699 | } | |
700 | else if (n == old_bss_index) | |
701 | ||
702 | /* If it is bss section, insert the new data2 section before it. */ | |
703 | { | |
704 | Elf32_Word tmp_align; | |
705 | Elf32_Addr tmp_addr; | |
706 | ||
707 | tmp_align = OLD_SECTION_H(n).sh_addralign; | |
708 | tmp_addr = OLD_SECTION_H(n).sh_addr; | |
709 | ||
710 | nn -= 2; | |
711 | /* Steal the data section header for this data2 section. */ | |
712 | memcpy (&NEW_SECTION_H(nn), &OLD_SECTION_H(old_data_index), | |
713 | new_file_h->e_shentsize); | |
714 | ||
715 | NEW_SECTION_H(nn).sh_addr = new_data2_addr; | |
716 | NEW_SECTION_H(nn).sh_offset = new_data2_offset; | |
717 | NEW_SECTION_H(nn).sh_size = new_data2_size; | |
718 | /* Use the bss section's alignment. This will assure that the | |
719 | new data2 section always be placed in the same spot as the old | |
720 | bss section by any other application. */ | |
721 | NEW_SECTION_H(nn).sh_addralign = tmp_align; | |
722 | ||
723 | /* Now copy over what we have in the memory now. */ | |
724 | memcpy (NEW_SECTION_H(nn).sh_offset + new_base, | |
725 | (caddr_t) tmp_addr, new_data2_size); | |
726 | nn += 2; | |
727 | } | |
728 | ||
729 | memcpy (&NEW_SECTION_H(nn), &OLD_SECTION_H(n), | |
730 | old_file_h->e_shentsize); | |
731 | ||
732 | if (old_sdata_index && n == old_sdata_index) | |
733 | /* The old .sdata section has now a new size */ | |
734 | NEW_SECTION_H(nn).sh_size = new_sdata_size; | |
735 | ||
736 | /* The new bss section's size is zero, and its file offset and virtual | |
737 | address should be off by NEW_DATA2_SIZE. */ | |
738 | if (n == old_sbss_index) | |
739 | { | |
740 | /* NN should be `old_sbss_index + 2' at this point. */ | |
741 | NEW_SECTION_H(nn).sh_offset += new_data2_size + new_data2_align + | |
742 | new_data3_size; | |
743 | NEW_SECTION_H(nn).sh_addr += new_data2_size + new_data2_align + | |
744 | new_data3_size; | |
745 | /* Let the new bss section address alignment be the same as the | |
746 | section address alignment followed the old bss section, so | |
747 | this section will be placed in exactly the same place. */ | |
748 | NEW_SECTION_H(nn).sh_addralign = | |
749 | OLD_SECTION_H(nn + (old_sdata_index ? 1 : 0)).sh_addralign; | |
750 | NEW_SECTION_H(nn).sh_size = 0; | |
751 | } | |
752 | else if (n == old_bss_index) | |
753 | { | |
754 | /* NN should be `old_bss_index + 2' at this point. */ | |
755 | NEW_SECTION_H(nn).sh_offset += new_data2_size + new_data2_align + | |
756 | new_data3_size - old_bss_padding; | |
757 | NEW_SECTION_H(nn).sh_addr += new_data2_size; | |
758 | /* Let the new bss section address alignment be the same as the | |
759 | section address alignment followed the old bss section, so | |
760 | this section will be placed in exactly the same place. */ | |
761 | NEW_SECTION_H(nn).sh_addralign = | |
762 | OLD_SECTION_H((nn - (old_sdata_index ? 0 : 1))).sh_addralign; | |
763 | NEW_SECTION_H(nn).sh_size = 0; | |
764 | } | |
765 | /* Any section that was original placed AFTER the bss section should now | |
766 | be off by NEW_DATA2_SIZE. */ | |
767 | else if (NEW_SECTION_H(nn).sh_offset >= new_data3_offset) | |
768 | NEW_SECTION_H(nn).sh_offset += new_data2_size + | |
769 | new_data2_align + | |
770 | new_data3_size - | |
771 | old_bss_padding; | |
772 | ||
773 | /* If any section hdr refers to the section after the new .data | |
774 | section, make it refer to next one because we have inserted | |
775 | a new section in between. */ | |
776 | ||
777 | PATCH_INDEX(NEW_SECTION_H(nn).sh_link); | |
778 | PATCH_INDEX(NEW_SECTION_H(nn).sh_info); | |
779 | ||
780 | /* Now, start to copy the content of sections. */ | |
781 | if (NEW_SECTION_H(nn).sh_type == SHT_NULL | |
782 | || NEW_SECTION_H(nn).sh_type == SHT_NOBITS) | |
783 | continue; | |
784 | ||
785 | /* Write out the sections. .data, .data1 and .sdata get copied from | |
786 | * the current process instead of the old file. | |
787 | */ | |
788 | if (!strcmp (old_section_names + OLD_SECTION_H(n).sh_name, ".data") || | |
789 | !strcmp (old_section_names + OLD_SECTION_H(n).sh_name, ".data1") || | |
790 | (old_sdata_index && (n == old_sdata_index))) | |
791 | src = (caddr_t) OLD_SECTION_H(n).sh_addr; | |
792 | else | |
793 | src = old_base + OLD_SECTION_H(n).sh_offset; | |
794 | ||
795 | memcpy (NEW_SECTION_H(nn).sh_offset + new_base, src, | |
796 | ((n == old_sdata_index) ? | |
797 | old_sdata_size : | |
798 | NEW_SECTION_H(nn).sh_size)); | |
799 | ||
800 | /* If it is the symbol table, its st_shndx field needs to be patched. */ | |
801 | if (NEW_SECTION_H(nn).sh_type == SHT_SYMTAB | |
802 | || NEW_SECTION_H(nn).sh_type == SHT_DYNSYM) | |
803 | { | |
804 | Elf32_Shdr *spt = &NEW_SECTION_H(nn); | |
805 | unsigned int num = spt->sh_size / spt->sh_entsize; | |
806 | Elf32_Sym * sym = (Elf32_Sym *) (NEW_SECTION_H(nn).sh_offset + | |
807 | new_base); | |
808 | for (; num--; sym++) | |
809 | { | |
810 | if ((sym->st_shndx == SHN_UNDEF) | |
811 | || (sym->st_shndx == SHN_ABS) | |
812 | || (sym->st_shndx == SHN_COMMON)) | |
813 | continue; | |
814 | ||
815 | PATCH_INDEX(sym->st_shndx); | |
816 | } | |
817 | } | |
818 | } | |
819 | ||
820 | /* Close the files and make the new file executable */ | |
821 | ||
822 | if (close (old_file)) | |
823 | fatal ("Can't close(%s): errno %d\n", old_name, errno); | |
824 | ||
825 | if (close (new_file)) | |
826 | fatal ("Can't close(%s): errno %d\n", new_name, errno); | |
827 | ||
828 | if (stat (new_name, &stat_buf) == -1) | |
829 | fatal ("Can't stat(%s): errno %d\n", new_name, errno); | |
830 | ||
831 | n = umask (777); | |
832 | umask (n); | |
833 | stat_buf.st_mode |= 0111 & ~n; | |
834 | if (chmod (new_name, stat_buf.st_mode) == -1) | |
835 | fatal ("Can't chmod(%s): errno %d\n", new_name, errno); | |
836 | } |