Commit | Line | Data |
---|---|---|
1b963cdd | 1 | /* Copyright (C) 1985, 1986, 1987, 1988, 1990, 1992, 1999, 2000 |
e40c4104 | 2 | Free Software Foundation, Inc. |
d427b66a | 3 | |
3b7ad313 | 4 | This file is part of GNU Emacs. |
e40c4104 | 5 | |
3b7ad313 EN |
6 | GNU Emacs is free software; you can redistribute it and/or modify |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2, or (at your option) | |
9 | any later version. | |
e40c4104 | 10 | |
3b7ad313 EN |
11 | GNU Emacs is distributed in the hope that it will be useful, |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GNU Emacs; see the file COPYING. If not, write to | |
18 | the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
19 | Boston, MA 02111-1307, USA. | |
d427b66a JB |
20 | |
21 | In other words, you are welcome to use, share and improve this program. | |
22 | You are forbidden to forbid anyone else to use, share and improve | |
23 | what you give them. Help stamp out software-hoarding! */ | |
24 | ||
25 | ||
26 | /* | |
27 | * unexec.c - Convert a running program into an a.out file. | |
28 | * | |
29 | * Author: Spencer W. Thomas | |
30 | * Computer Science Dept. | |
31 | * University of Utah | |
32 | * Date: Tue Mar 2 1982 | |
33 | * Modified heavily since then. | |
34 | * | |
35 | * Synopsis: | |
89b95605 RS |
36 | * unexec (new_name, old_name, data_start, bss_start, entry_address) |
37 | * char *new_name, *old_name; | |
d427b66a JB |
38 | * unsigned data_start, bss_start, entry_address; |
39 | * | |
40 | * Takes a snapshot of the program and makes an a.out format file in the | |
41 | * file named by the string argument new_name. | |
89b95605 RS |
42 | * If old_name is non-NULL, the symbol table will be taken from the given file. |
43 | * On some machines, an existing old_name file is required. | |
d427b66a JB |
44 | * |
45 | * The boundaries within the a.out file may be adjusted with the data_start | |
46 | * and bss_start arguments. Either or both may be given as 0 for defaults. | |
47 | * | |
48 | * Data_start gives the boundary between the text segment and the data | |
49 | * segment of the program. The text segment can contain shared, read-only | |
50 | * program code and literal data, while the data segment is always unshared | |
51 | * and unprotected. Data_start gives the lowest unprotected address. | |
52 | * The value you specify may be rounded down to a suitable boundary | |
53 | * as required by the machine you are using. | |
54 | * | |
d427b66a JB |
55 | * Bss_start indicates how much of the data segment is to be saved in the |
56 | * a.out file and restored when the program is executed. It gives the lowest | |
57 | * unsaved address, and is rounded up to a page boundary. The default when 0 | |
58 | * is given assumes that the entire data segment is to be stored, including | |
59 | * the previous data and bss as well as any additional storage allocated with | |
60 | * break (2). | |
61 | * | |
62 | * The new file is set up to start at entry_address. | |
63 | * | |
d427b66a JB |
64 | */ |
65 | ||
66 | /* Even more heavily modified by james@bigtex.cactus.org of Dell Computer Co. | |
67 | * ELF support added. | |
68 | * | |
69 | * Basic theory: the data space of the running process needs to be | |
70 | * dumped to the output file. Normally we would just enlarge the size | |
71 | * of .data, scooting everything down. But we can't do that in ELF, | |
72 | * because there is often something between the .data space and the | |
73 | * .bss space. | |
74 | * | |
75 | * In the temacs dump below, notice that the Global Offset Table | |
76 | * (.got) and the Dynamic link data (.dynamic) come between .data1 and | |
77 | * .bss. It does not work to overlap .data with these fields. | |
78 | * | |
79 | * The solution is to create a new .data segment. This segment is | |
80 | * filled with data from the current process. Since the contents of | |
81 | * various sections refer to sections by index, the new .data segment | |
82 | * is made the last in the table to avoid changing any existing index. | |
83 | ||
84 | * This is an example of how the section headers are changed. "Addr" | |
85 | * is a process virtual address. "Offset" is a file offset. | |
86 | ||
87 | raid:/nfs/raid/src/dist-18.56/src> dump -h temacs | |
88 | ||
89 | temacs: | |
90 | ||
91 | **** SECTION HEADER TABLE **** | |
92 | [No] Type Flags Addr Offset Size Name | |
93 | Link Info Adralgn Entsize | |
94 | ||
95 | [1] 1 2 0x80480d4 0xd4 0x13 .interp | |
994a65f3 | 96 | 0 0 0x1 0 |
d427b66a JB |
97 | |
98 | [2] 5 2 0x80480e8 0xe8 0x388 .hash | |
994a65f3 | 99 | 3 0 0x4 0x4 |
d427b66a JB |
100 | |
101 | [3] 11 2 0x8048470 0x470 0x7f0 .dynsym | |
994a65f3 | 102 | 4 1 0x4 0x10 |
d427b66a JB |
103 | |
104 | [4] 3 2 0x8048c60 0xc60 0x3ad .dynstr | |
994a65f3 | 105 | 0 0 0x1 0 |
d427b66a JB |
106 | |
107 | [5] 9 2 0x8049010 0x1010 0x338 .rel.plt | |
994a65f3 | 108 | 3 7 0x4 0x8 |
d427b66a JB |
109 | |
110 | [6] 1 6 0x8049348 0x1348 0x3 .init | |
994a65f3 | 111 | 0 0 0x4 0 |
d427b66a JB |
112 | |
113 | [7] 1 6 0x804934c 0x134c 0x680 .plt | |
994a65f3 | 114 | 0 0 0x4 0x4 |
d427b66a JB |
115 | |
116 | [8] 1 6 0x80499cc 0x19cc 0x3c56f .text | |
994a65f3 | 117 | 0 0 0x4 0 |
d427b66a JB |
118 | |
119 | [9] 1 6 0x8085f3c 0x3df3c 0x3 .fini | |
994a65f3 | 120 | 0 0 0x4 0 |
d427b66a JB |
121 | |
122 | [10] 1 2 0x8085f40 0x3df40 0x69c .rodata | |
994a65f3 | 123 | 0 0 0x4 0 |
d427b66a JB |
124 | |
125 | [11] 1 2 0x80865dc 0x3e5dc 0xd51 .rodata1 | |
994a65f3 | 126 | 0 0 0x4 0 |
d427b66a JB |
127 | |
128 | [12] 1 3 0x8088330 0x3f330 0x20afc .data | |
994a65f3 | 129 | 0 0 0x4 0 |
d427b66a JB |
130 | |
131 | [13] 1 3 0x80a8e2c 0x5fe2c 0x89d .data1 | |
994a65f3 | 132 | 0 0 0x4 0 |
d427b66a JB |
133 | |
134 | [14] 1 3 0x80a96cc 0x606cc 0x1a8 .got | |
994a65f3 | 135 | 0 0 0x4 0x4 |
d427b66a JB |
136 | |
137 | [15] 6 3 0x80a9874 0x60874 0x80 .dynamic | |
994a65f3 | 138 | 4 0 0x4 0x8 |
d427b66a JB |
139 | |
140 | [16] 8 3 0x80a98f4 0x608f4 0x449c .bss | |
994a65f3 | 141 | 0 0 0x4 0 |
d427b66a JB |
142 | |
143 | [17] 2 0 0 0x608f4 0x9b90 .symtab | |
994a65f3 | 144 | 18 371 0x4 0x10 |
d427b66a JB |
145 | |
146 | [18] 3 0 0 0x6a484 0x8526 .strtab | |
994a65f3 | 147 | 0 0 0x1 0 |
d427b66a JB |
148 | |
149 | [19] 3 0 0 0x729aa 0x93 .shstrtab | |
994a65f3 | 150 | 0 0 0x1 0 |
d427b66a JB |
151 | |
152 | [20] 1 0 0 0x72a3d 0x68b7 .comment | |
994a65f3 | 153 | 0 0 0x1 0 |
d427b66a JB |
154 | |
155 | raid:/nfs/raid/src/dist-18.56/src> dump -h xemacs | |
156 | ||
157 | xemacs: | |
158 | ||
159 | **** SECTION HEADER TABLE **** | |
160 | [No] Type Flags Addr Offset Size Name | |
161 | Link Info Adralgn Entsize | |
162 | ||
163 | [1] 1 2 0x80480d4 0xd4 0x13 .interp | |
994a65f3 | 164 | 0 0 0x1 0 |
d427b66a JB |
165 | |
166 | [2] 5 2 0x80480e8 0xe8 0x388 .hash | |
994a65f3 | 167 | 3 0 0x4 0x4 |
d427b66a JB |
168 | |
169 | [3] 11 2 0x8048470 0x470 0x7f0 .dynsym | |
994a65f3 | 170 | 4 1 0x4 0x10 |
d427b66a JB |
171 | |
172 | [4] 3 2 0x8048c60 0xc60 0x3ad .dynstr | |
994a65f3 | 173 | 0 0 0x1 0 |
d427b66a JB |
174 | |
175 | [5] 9 2 0x8049010 0x1010 0x338 .rel.plt | |
994a65f3 | 176 | 3 7 0x4 0x8 |
d427b66a JB |
177 | |
178 | [6] 1 6 0x8049348 0x1348 0x3 .init | |
994a65f3 | 179 | 0 0 0x4 0 |
d427b66a JB |
180 | |
181 | [7] 1 6 0x804934c 0x134c 0x680 .plt | |
994a65f3 | 182 | 0 0 0x4 0x4 |
d427b66a JB |
183 | |
184 | [8] 1 6 0x80499cc 0x19cc 0x3c56f .text | |
994a65f3 | 185 | 0 0 0x4 0 |
d427b66a JB |
186 | |
187 | [9] 1 6 0x8085f3c 0x3df3c 0x3 .fini | |
994a65f3 | 188 | 0 0 0x4 0 |
d427b66a JB |
189 | |
190 | [10] 1 2 0x8085f40 0x3df40 0x69c .rodata | |
994a65f3 | 191 | 0 0 0x4 0 |
d427b66a JB |
192 | |
193 | [11] 1 2 0x80865dc 0x3e5dc 0xd51 .rodata1 | |
994a65f3 | 194 | 0 0 0x4 0 |
d427b66a JB |
195 | |
196 | [12] 1 3 0x8088330 0x3f330 0x20afc .data | |
994a65f3 | 197 | 0 0 0x4 0 |
d427b66a JB |
198 | |
199 | [13] 1 3 0x80a8e2c 0x5fe2c 0x89d .data1 | |
994a65f3 | 200 | 0 0 0x4 0 |
d427b66a JB |
201 | |
202 | [14] 1 3 0x80a96cc 0x606cc 0x1a8 .got | |
994a65f3 | 203 | 0 0 0x4 0x4 |
d427b66a JB |
204 | |
205 | [15] 6 3 0x80a9874 0x60874 0x80 .dynamic | |
994a65f3 | 206 | 4 0 0x4 0x8 |
d427b66a JB |
207 | |
208 | [16] 8 3 0x80c6800 0x7d800 0 .bss | |
994a65f3 | 209 | 0 0 0x4 0 |
d427b66a JB |
210 | |
211 | [17] 2 0 0 0x7d800 0x9b90 .symtab | |
994a65f3 | 212 | 18 371 0x4 0x10 |
d427b66a JB |
213 | |
214 | [18] 3 0 0 0x87390 0x8526 .strtab | |
994a65f3 | 215 | 0 0 0x1 0 |
d427b66a JB |
216 | |
217 | [19] 3 0 0 0x8f8b6 0x93 .shstrtab | |
994a65f3 | 218 | 0 0 0x1 0 |
d427b66a JB |
219 | |
220 | [20] 1 0 0 0x8f949 0x68b7 .comment | |
994a65f3 | 221 | 0 0 0x1 0 |
d427b66a JB |
222 | |
223 | [21] 1 3 0x80a98f4 0x608f4 0x1cf0c .data | |
994a65f3 | 224 | 0 0 0x4 0 |
d427b66a JB |
225 | |
226 | * This is an example of how the file header is changed. "Shoff" is | |
227 | * the section header offset within the file. Since that table is | |
228 | * after the new .data section, it is moved. "Shnum" is the number of | |
229 | * sections, which we increment. | |
230 | * | |
231 | * "Phoff" is the file offset to the program header. "Phentsize" and | |
232 | * "Shentsz" are the program and section header entries sizes respectively. | |
233 | * These can be larger than the apparent struct sizes. | |
234 | ||
235 | raid:/nfs/raid/src/dist-18.56/src> dump -f temacs | |
236 | ||
237 | temacs: | |
238 | ||
239 | **** ELF HEADER **** | |
240 | Class Data Type Machine Version | |
241 | Entry Phoff Shoff Flags Ehsize | |
242 | Phentsize Phnum Shentsz Shnum Shstrndx | |
243 | ||
244 | 1 1 2 3 1 | |
245 | 0x80499cc 0x34 0x792f4 0 0x34 | |
246 | 0x20 5 0x28 21 19 | |
247 | ||
248 | raid:/nfs/raid/src/dist-18.56/src> dump -f xemacs | |
249 | ||
250 | xemacs: | |
251 | ||
252 | **** ELF HEADER **** | |
253 | Class Data Type Machine Version | |
254 | Entry Phoff Shoff Flags Ehsize | |
255 | Phentsize Phnum Shentsz Shnum Shstrndx | |
256 | ||
257 | 1 1 2 3 1 | |
258 | 0x80499cc 0x34 0x96200 0 0x34 | |
259 | 0x20 5 0x28 22 19 | |
260 | ||
261 | * These are the program headers. "Offset" is the file offset to the | |
262 | * segment. "Vaddr" is the memory load address. "Filesz" is the | |
263 | * segment size as it appears in the file, and "Memsz" is the size in | |
264 | * memory. Below, the third segment is the code and the fourth is the | |
265 | * data: the difference between Filesz and Memsz is .bss | |
266 | ||
267 | raid:/nfs/raid/src/dist-18.56/src> dump -o temacs | |
268 | ||
269 | temacs: | |
270 | ***** PROGRAM EXECUTION HEADER ***** | |
271 | Type Offset Vaddr Paddr | |
272 | Filesz Memsz Flags Align | |
273 | ||
994a65f3 RM |
274 | 6 0x34 0x8048034 0 |
275 | 0xa0 0xa0 5 0 | |
d427b66a | 276 | |
994a65f3 RM |
277 | 3 0xd4 0 0 |
278 | 0x13 0 4 0 | |
d427b66a | 279 | |
994a65f3 RM |
280 | 1 0x34 0x8048034 0 |
281 | 0x3f2f9 0x3f2f9 5 0x1000 | |
d427b66a | 282 | |
994a65f3 RM |
283 | 1 0x3f330 0x8088330 0 |
284 | 0x215c4 0x25a60 7 0x1000 | |
d427b66a | 285 | |
994a65f3 RM |
286 | 2 0x60874 0x80a9874 0 |
287 | 0x80 0 7 0 | |
d427b66a JB |
288 | |
289 | raid:/nfs/raid/src/dist-18.56/src> dump -o xemacs | |
290 | ||
291 | xemacs: | |
292 | ***** PROGRAM EXECUTION HEADER ***** | |
293 | Type Offset Vaddr Paddr | |
294 | Filesz Memsz Flags Align | |
295 | ||
994a65f3 RM |
296 | 6 0x34 0x8048034 0 |
297 | 0xa0 0xa0 5 0 | |
d427b66a | 298 | |
994a65f3 RM |
299 | 3 0xd4 0 0 |
300 | 0x13 0 4 0 | |
d427b66a | 301 | |
994a65f3 RM |
302 | 1 0x34 0x8048034 0 |
303 | 0x3f2f9 0x3f2f9 5 0x1000 | |
d427b66a | 304 | |
994a65f3 RM |
305 | 1 0x3f330 0x8088330 0 |
306 | 0x3e4d0 0x3e4d0 7 0x1000 | |
d427b66a | 307 | |
994a65f3 RM |
308 | 2 0x60874 0x80a9874 0 |
309 | 0x80 0 7 0 | |
d427b66a JB |
310 | |
311 | ||
312 | */ | |
e40c4104 | 313 | \f |
994a65f3 RM |
314 | /* Modified by wtien@urbana.mcd.mot.com of Motorola Inc. |
315 | * | |
e40c4104 | 316 | * The above mechanism does not work if the unexeced ELF file is being |
994a65f3 | 317 | * re-layout by other applications (such as `strip'). All the applications |
e40c4104 | 318 | * that re-layout the internal of ELF will layout all sections in ascending |
994a65f3 RM |
319 | * order of their file offsets. After the re-layout, the data2 section will |
320 | * still be the LAST section in the section header vector, but its file offset | |
e40c4104 | 321 | * is now being pushed far away down, and causes part of it not to be mapped |
994a65f3 | 322 | * in (ie. not covered by the load segment entry in PHDR vector), therefore |
e40c4104 RS |
323 | * causes the new binary to fail. |
324 | * | |
325 | * The solution is to modify the unexec algorithm to insert the new data2 | |
326 | * section header right before the new bss section header, so their file | |
994a65f3 RM |
327 | * offsets will be in the ascending order. Since some of the section's (all |
328 | * sections AFTER the bss section) indexes are now changed, we also need to | |
329 | * modify some fields to make them point to the right sections. This is done | |
e40c4104 | 330 | * by macro PATCH_INDEX. All the fields that need to be patched are: |
994a65f3 | 331 | * |
e40c4104 RS |
332 | * 1. ELF header e_shstrndx field. |
333 | * 2. section header sh_link and sh_info field. | |
334 | * 3. symbol table entry st_shndx field. | |
335 | * | |
336 | * The above example now should look like: | |
337 | ||
338 | **** SECTION HEADER TABLE **** | |
339 | [No] Type Flags Addr Offset Size Name | |
340 | Link Info Adralgn Entsize | |
341 | ||
342 | [1] 1 2 0x80480d4 0xd4 0x13 .interp | |
994a65f3 | 343 | 0 0 0x1 0 |
d427b66a | 344 | |
e40c4104 | 345 | [2] 5 2 0x80480e8 0xe8 0x388 .hash |
994a65f3 | 346 | 3 0 0x4 0x4 |
e40c4104 RS |
347 | |
348 | [3] 11 2 0x8048470 0x470 0x7f0 .dynsym | |
994a65f3 | 349 | 4 1 0x4 0x10 |
e40c4104 RS |
350 | |
351 | [4] 3 2 0x8048c60 0xc60 0x3ad .dynstr | |
994a65f3 | 352 | 0 0 0x1 0 |
e40c4104 RS |
353 | |
354 | [5] 9 2 0x8049010 0x1010 0x338 .rel.plt | |
994a65f3 | 355 | 3 7 0x4 0x8 |
e40c4104 RS |
356 | |
357 | [6] 1 6 0x8049348 0x1348 0x3 .init | |
994a65f3 | 358 | 0 0 0x4 0 |
e40c4104 RS |
359 | |
360 | [7] 1 6 0x804934c 0x134c 0x680 .plt | |
994a65f3 | 361 | 0 0 0x4 0x4 |
e40c4104 RS |
362 | |
363 | [8] 1 6 0x80499cc 0x19cc 0x3c56f .text | |
994a65f3 | 364 | 0 0 0x4 0 |
e40c4104 RS |
365 | |
366 | [9] 1 6 0x8085f3c 0x3df3c 0x3 .fini | |
994a65f3 | 367 | 0 0 0x4 0 |
e40c4104 RS |
368 | |
369 | [10] 1 2 0x8085f40 0x3df40 0x69c .rodata | |
994a65f3 | 370 | 0 0 0x4 0 |
e40c4104 RS |
371 | |
372 | [11] 1 2 0x80865dc 0x3e5dc 0xd51 .rodata1 | |
994a65f3 | 373 | 0 0 0x4 0 |
e40c4104 RS |
374 | |
375 | [12] 1 3 0x8088330 0x3f330 0x20afc .data | |
994a65f3 | 376 | 0 0 0x4 0 |
e40c4104 RS |
377 | |
378 | [13] 1 3 0x80a8e2c 0x5fe2c 0x89d .data1 | |
994a65f3 | 379 | 0 0 0x4 0 |
e40c4104 RS |
380 | |
381 | [14] 1 3 0x80a96cc 0x606cc 0x1a8 .got | |
994a65f3 | 382 | 0 0 0x4 0x4 |
e40c4104 RS |
383 | |
384 | [15] 6 3 0x80a9874 0x60874 0x80 .dynamic | |
994a65f3 | 385 | 4 0 0x4 0x8 |
e40c4104 RS |
386 | |
387 | [16] 1 3 0x80a98f4 0x608f4 0x1cf0c .data | |
994a65f3 | 388 | 0 0 0x4 0 |
e40c4104 RS |
389 | |
390 | [17] 8 3 0x80c6800 0x7d800 0 .bss | |
994a65f3 | 391 | 0 0 0x4 0 |
e40c4104 RS |
392 | |
393 | [18] 2 0 0 0x7d800 0x9b90 .symtab | |
994a65f3 | 394 | 19 371 0x4 0x10 |
e40c4104 RS |
395 | |
396 | [19] 3 0 0 0x87390 0x8526 .strtab | |
994a65f3 | 397 | 0 0 0x1 0 |
e40c4104 RS |
398 | |
399 | [20] 3 0 0 0x8f8b6 0x93 .shstrtab | |
994a65f3 | 400 | 0 0 0x1 0 |
e40c4104 RS |
401 | |
402 | [21] 1 0 0 0x8f949 0x68b7 .comment | |
994a65f3 | 403 | 0 0 0x1 0 |
e40c4104 RS |
404 | |
405 | */ | |
406 | \f | |
1b963cdd DL |
407 | #ifndef emacs |
408 | #define fatal(a, b, c) fprintf (stderr, a, b, c), exit (1) | |
409 | #else | |
410 | #include <config.h> | |
411 | extern void fatal (char *, ...); | |
412 | #endif | |
413 | ||
d427b66a JB |
414 | #include <sys/types.h> |
415 | #include <stdio.h> | |
416 | #include <sys/stat.h> | |
417 | #include <memory.h> | |
418 | #include <string.h> | |
419 | #include <errno.h> | |
420 | #include <unistd.h> | |
421 | #include <fcntl.h> | |
cb1ee811 | 422 | #if !defined (__NetBSD__) && !defined (__OpenBSD__) |
d427b66a | 423 | #include <elf.h> |
e5d0f709 | 424 | #endif |
d427b66a | 425 | #include <sys/mman.h> |
9240b21d RS |
426 | #if defined (__sony_news) && defined (_SYSTYPE_SYSV) |
427 | #include <sys/elf_mips.h> | |
428 | #include <sym.h> | |
429 | #endif /* __sony_news && _SYSTYPE_SYSV */ | |
bc597cc7 | 430 | #if __sgi |
52da6a59 | 431 | #include <syms.h> /* for HDRR declaration */ |
bc597cc7 | 432 | #endif /* __sgi */ |
4dbcac31 | 433 | |
cb1ee811 | 434 | #if defined (__alpha__) && !defined (__NetBSD__) && !defined (__OpenBSD__) |
eabb24d0 RS |
435 | /* Declare COFF debugging symbol table. This used to be in |
436 | /usr/include/sym.h, but this file is no longer included in Red Hat | |
437 | 5.0 and presumably in any other glibc 2.x based distribution. */ | |
438 | typedef struct { | |
439 | short magic; | |
440 | short vstamp; | |
441 | int ilineMax; | |
442 | int idnMax; | |
443 | int ipdMax; | |
444 | int isymMax; | |
445 | int ioptMax; | |
446 | int iauxMax; | |
447 | int issMax; | |
448 | int issExtMax; | |
449 | int ifdMax; | |
450 | int crfd; | |
451 | int iextMax; | |
452 | long cbLine; | |
453 | long cbLineOffset; | |
454 | long cbDnOffset; | |
455 | long cbPdOffset; | |
456 | long cbSymOffset; | |
457 | long cbOptOffset; | |
458 | long cbAuxOffset; | |
459 | long cbSsOffset; | |
460 | long cbSsExtOffset; | |
461 | long cbFdOffset; | |
462 | long cbRfdOffset; | |
463 | long cbExtOffset; | |
464 | } HDRR, *pHDRR; | |
465 | #define cbHDRR sizeof(HDRR) | |
466 | #define hdrNil ((pHDRR)0) | |
265b2695 RS |
467 | #endif |
468 | ||
e5d0f709 RS |
469 | #ifdef __NetBSD__ |
470 | /* | |
471 | * NetBSD does not have normal-looking user-land ELF support. | |
472 | */ | |
473 | # ifdef __alpha__ | |
474 | # define ELFSIZE 64 | |
475 | # else | |
476 | # define ELFSIZE 32 | |
477 | # endif | |
478 | # include <sys/exec_elf.h> | |
479 | ||
0007072a KR |
480 | # ifndef PT_LOAD |
481 | # define PT_LOAD Elf_pt_load | |
482 | # define SHT_SYMTAB Elf_sht_symtab | |
483 | # define SHT_DYNSYM Elf_sht_dynsym | |
484 | # define SHT_NULL Elf_sht_null | |
485 | # define SHT_NOBITS Elf_sht_nobits | |
486 | # define SHT_REL Elf_sht_rel | |
487 | # define SHT_RELA Elf_sht_rela | |
488 | ||
489 | # define SHN_UNDEF Elf_eshn_undefined | |
490 | # define SHN_ABS Elf_eshn_absolute | |
491 | # define SHN_COMMON Elf_eshn_common | |
492 | # endif | |
e5d0f709 | 493 | |
e5d0f709 RS |
494 | # ifdef __alpha__ |
495 | # include <sys/exec_ecoff.h> | |
496 | # define HDRR struct ecoff_symhdr | |
497 | # define pHDRR HDRR * | |
498 | # endif | |
499 | #endif /* __NetBSD__ */ | |
500 | ||
cb1ee811 RS |
501 | #ifdef __OpenBSD__ |
502 | # include <sys/exec_elf.h> | |
503 | #endif | |
504 | ||
265b2695 RS |
505 | #if __GNU_LIBRARY__ - 0 >= 6 |
506 | # include <link.h> /* get ElfW etc */ | |
507 | #endif | |
508 | ||
509 | #ifndef ElfW | |
510 | # ifdef __STDC__ | |
1b963cdd | 511 | # define ElfBitsW(bits, type) Elf##bits##_##type |
68c45bf0 | 512 | # else |
1b963cdd | 513 | # define ElfBitsW(bits, type) Elf/**/bits/**/_/**/type |
68c45bf0 | 514 | # endif |
1b963cdd DL |
515 | # ifdef _LP64 |
516 | # define ELFSIZE 64 | |
517 | # else | |
518 | # define ELFSIZE 32 | |
519 | # endif | |
520 | /* This macro expands `bits' before invoking ElfBitsW. */ | |
521 | # define ElfExpandBitsW(bits, type) ElfBitsW (bits, type) | |
522 | # define ElfW(type) ElfExpandBitsW (ELFSIZE, type) | |
d427b66a JB |
523 | #endif |
524 | ||
d8858cfe RS |
525 | #ifndef ELF_BSS_SECTION_NAME |
526 | #define ELF_BSS_SECTION_NAME ".bss" | |
527 | #endif | |
528 | ||
d427b66a JB |
529 | /* Get the address of a particular section or program header entry, |
530 | * accounting for the size of the entries. | |
531 | */ | |
bc597cc7 | 532 | /* |
ea083293 RS |
533 | On PPC Reference Platform running Solaris 2.5.1 |
534 | the plt section is also of type NOBI like the bss section. | |
535 | (not really stored) and therefore sections after the bss | |
536 | section start at the plt offset. The plt section is always | |
537 | the one just before the bss section. | |
538 | Thus, we modify the test from | |
539 | if (NEW_SECTION_H (nn).sh_offset >= new_data2_offset) | |
540 | to | |
bc597cc7 | 541 | if (NEW_SECTION_H (nn).sh_offset >= |
ea083293 RS |
542 | OLD_SECTION_H (old_bss_index-1).sh_offset) |
543 | This is just a hack. We should put the new data section | |
544 | before the .plt section. | |
545 | And we should not have this routine at all but use | |
546 | the libelf library to read the old file and create the new | |
547 | file. | |
548 | The changed code is minimal and depends on prep set in m/prep.h | |
549 | Erik Deumens | |
550 | Quantum Theory Project | |
551 | University of Florida | |
552 | deumens@qtp.ufl.edu | |
553 | Apr 23, 1996 | |
554 | */ | |
d427b66a JB |
555 | |
556 | #define OLD_SECTION_H(n) \ | |
265b2695 | 557 | (*(ElfW(Shdr) *) ((byte *) old_section_h + old_file_h->e_shentsize * (n))) |
d427b66a | 558 | #define NEW_SECTION_H(n) \ |
265b2695 | 559 | (*(ElfW(Shdr) *) ((byte *) new_section_h + new_file_h->e_shentsize * (n))) |
d427b66a | 560 | #define OLD_PROGRAM_H(n) \ |
265b2695 | 561 | (*(ElfW(Phdr) *) ((byte *) old_program_h + old_file_h->e_phentsize * (n))) |
d427b66a | 562 | #define NEW_PROGRAM_H(n) \ |
265b2695 | 563 | (*(ElfW(Phdr) *) ((byte *) new_program_h + new_file_h->e_phentsize * (n))) |
d427b66a | 564 | |
e40c4104 RS |
565 | #define PATCH_INDEX(n) \ |
566 | do { \ | |
d7cb42c3 | 567 | if ((int) (n) >= old_bss_index) \ |
e40c4104 | 568 | (n)++; } while (0) |
d427b66a JB |
569 | typedef unsigned char byte; |
570 | ||
e40c4104 RS |
571 | /* Round X up to a multiple of Y. */ |
572 | ||
bc597cc7 | 573 | static ElfW(Addr) |
e40c4104 | 574 | round_up (x, y) |
4461bfd3 | 575 | ElfW(Addr) x, y; |
e40c4104 RS |
576 | { |
577 | int rem = x % y; | |
578 | if (rem == 0) | |
579 | return x; | |
580 | return x - rem + y; | |
581 | } | |
582 | ||
52da6a59 GM |
583 | /* Return the index of the section named NAME. |
584 | SECTION_NAMES, FILE_NAME and FILE_H give information | |
585 | about the file we are looking in. | |
586 | ||
587 | If we don't find the section NAME, that is a fatal error | |
588 | if NOERROR is 0; we return -1 if NOERROR is nonzero. */ | |
589 | ||
590 | static int | |
591 | find_section (name, section_names, file_name, old_file_h, old_section_h, noerror) | |
592 | char *name; | |
593 | char *section_names; | |
594 | char *file_name; | |
595 | ElfW(Ehdr) *old_file_h; | |
596 | ElfW(Shdr) *old_section_h; | |
597 | int noerror; | |
598 | { | |
599 | int idx; | |
600 | ||
601 | for (idx = 1; idx < old_file_h->e_shnum; idx++) | |
602 | { | |
603 | #ifdef DEBUG | |
604 | fprintf (stderr, "Looking for %s - found %s\n", name, | |
605 | section_names + OLD_SECTION_H (idx).sh_name); | |
606 | #endif | |
607 | if (!strcmp (section_names + OLD_SECTION_H (idx).sh_name, | |
608 | name)) | |
609 | break; | |
610 | } | |
611 | if (idx == old_file_h->e_shnum) | |
612 | { | |
613 | if (noerror) | |
614 | return -1; | |
615 | else | |
616 | fatal ("Can't find %s in %s.\n", name, file_name, 0); | |
617 | } | |
618 | ||
619 | return idx; | |
620 | } | |
621 | ||
d427b66a JB |
622 | /* **************************************************************** |
623 | * unexec | |
624 | * | |
625 | * driving logic. | |
626 | * | |
627 | * In ELF, this works by replacing the old .bss section with a new | |
628 | * .data section, and inserting an empty .bss immediately afterwards. | |
629 | * | |
630 | */ | |
631 | void | |
632 | unexec (new_name, old_name, data_start, bss_start, entry_address) | |
633 | char *new_name, *old_name; | |
634 | unsigned data_start, bss_start, entry_address; | |
635 | { | |
d427b66a JB |
636 | int new_file, old_file, new_file_size; |
637 | ||
638 | /* Pointers to the base of the image of the two files. */ | |
639 | caddr_t old_base, new_base; | |
640 | ||
641 | /* Pointers to the file, program and section headers for the old and new | |
642 | * files. | |
643 | */ | |
265b2695 RS |
644 | ElfW(Ehdr) *old_file_h, *new_file_h; |
645 | ElfW(Phdr) *old_program_h, *new_program_h; | |
646 | ElfW(Shdr) *old_section_h, *new_section_h; | |
d427b66a JB |
647 | |
648 | /* Point to the section name table in the old file */ | |
649 | char *old_section_names; | |
650 | ||
265b2695 RS |
651 | ElfW(Addr) old_bss_addr, new_bss_addr; |
652 | ElfW(Word) old_bss_size, new_data2_size; | |
653 | ElfW(Off) new_data2_offset; | |
654 | ElfW(Addr) new_data2_addr; | |
d427b66a | 655 | |
52da6a59 GM |
656 | int n, nn; |
657 | int old_bss_index, old_sbss_index; | |
658 | int old_data_index, new_data2_index; | |
659 | int old_mdebug_index; | |
d427b66a JB |
660 | struct stat stat_buf; |
661 | ||
662 | /* Open the old file & map it into the address space. */ | |
663 | ||
664 | old_file = open (old_name, O_RDONLY); | |
665 | ||
666 | if (old_file < 0) | |
667 | fatal ("Can't open %s for reading: errno %d\n", old_name, errno); | |
668 | ||
669 | if (fstat (old_file, &stat_buf) == -1) | |
d7cb42c3 | 670 | fatal ("Can't fstat (%s): errno %d\n", old_name, errno); |
d427b66a | 671 | |
89b95605 RS |
672 | old_base = mmap ((caddr_t) 0, stat_buf.st_size, PROT_READ, MAP_SHARED, |
673 | old_file, 0); | |
d427b66a JB |
674 | |
675 | if (old_base == (caddr_t) -1) | |
d7cb42c3 | 676 | fatal ("Can't mmap (%s): errno %d\n", old_name, errno); |
d427b66a JB |
677 | |
678 | #ifdef DEBUG | |
d283640e KH |
679 | fprintf (stderr, "mmap (%s, %x) -> %x\n", old_name, stat_buf.st_size, |
680 | old_base); | |
d427b66a JB |
681 | #endif |
682 | ||
683 | /* Get pointers to headers & section names */ | |
684 | ||
265b2695 RS |
685 | old_file_h = (ElfW(Ehdr) *) old_base; |
686 | old_program_h = (ElfW(Phdr) *) ((byte *) old_base + old_file_h->e_phoff); | |
687 | old_section_h = (ElfW(Shdr) *) ((byte *) old_base + old_file_h->e_shoff); | |
d427b66a | 688 | old_section_names = (char *) old_base |
d7cb42c3 | 689 | + OLD_SECTION_H (old_file_h->e_shstrndx).sh_offset; |
d427b66a | 690 | |
52da6a59 GM |
691 | /* Find the mdebug section, if any. */ |
692 | ||
693 | old_mdebug_index = find_section (".mdebug", old_section_names, | |
694 | old_name, old_file_h, old_section_h, 1); | |
695 | ||
d427b66a JB |
696 | /* Find the old .bss section. Figure out parameters of the new |
697 | * data2 and bss sections. | |
698 | */ | |
699 | ||
52da6a59 GM |
700 | old_bss_index = find_section (".bss", old_section_names, |
701 | old_name, old_file_h, old_section_h, 0); | |
d427b66a | 702 | |
52da6a59 GM |
703 | old_sbss_index = find_section (".sbss", old_section_names, |
704 | old_name, old_file_h, old_section_h, 1); | |
1b963cdd DL |
705 | if (old_sbss_index != -1) |
706 | if (OLD_SECTION_H (old_sbss_index).sh_type == SHT_PROGBITS) | |
707 | old_sbss_index = -1; | |
52da6a59 GM |
708 | |
709 | if (old_sbss_index == -1) | |
9240b21d | 710 | { |
52da6a59 GM |
711 | old_bss_addr = OLD_SECTION_H (old_bss_index).sh_addr; |
712 | old_bss_size = OLD_SECTION_H (old_bss_index).sh_size; | |
9240b21d RS |
713 | new_data2_index = old_bss_index; |
714 | } | |
715 | else | |
716 | { | |
52da6a59 GM |
717 | old_bss_addr = OLD_SECTION_H (old_sbss_index).sh_addr; |
718 | old_bss_size = OLD_SECTION_H (old_bss_index).sh_size | |
719 | + OLD_SECTION_H (old_sbss_index).sh_size; | |
9240b21d RS |
720 | new_data2_index = old_sbss_index; |
721 | } | |
722 | ||
52da6a59 GM |
723 | /* Find the old .data section. Figure out parameters of |
724 | the new data2 and bss sections. */ | |
725 | ||
726 | old_data_index = find_section (".data", old_section_names, | |
727 | old_name, old_file_h, old_section_h, 0); | |
bc597cc7 | 728 | |
cb1ee811 | 729 | #if defined (emacs) || !defined (DEBUG) |
265b2695 | 730 | new_bss_addr = (ElfW(Addr)) sbrk (0); |
d427b66a JB |
731 | #else |
732 | new_bss_addr = old_bss_addr + old_bss_size + 0x1234; | |
733 | #endif | |
734 | new_data2_addr = old_bss_addr; | |
735 | new_data2_size = new_bss_addr - old_bss_addr; | |
52da6a59 GM |
736 | new_data2_offset = OLD_SECTION_H (old_data_index).sh_offset + |
737 | (new_data2_addr - OLD_SECTION_H (old_data_index).sh_addr); | |
d427b66a JB |
738 | |
739 | #ifdef DEBUG | |
740 | fprintf (stderr, "old_bss_index %d\n", old_bss_index); | |
d283640e KH |
741 | fprintf (stderr, "old_bss_addr %x\n", old_bss_addr); |
742 | fprintf (stderr, "old_bss_size %x\n", old_bss_size); | |
743 | fprintf (stderr, "new_bss_addr %x\n", new_bss_addr); | |
744 | fprintf (stderr, "new_data2_addr %x\n", new_data2_addr); | |
745 | fprintf (stderr, "new_data2_size %x\n", new_data2_size); | |
746 | fprintf (stderr, "new_data2_offset %x\n", new_data2_offset); | |
d427b66a JB |
747 | #endif |
748 | ||
d283640e | 749 | if ((unsigned) new_bss_addr < (unsigned) old_bss_addr + old_bss_size) |
d427b66a JB |
750 | fatal (".bss shrank when undumping???\n", 0, 0); |
751 | ||
d7cb42c3 | 752 | /* Set the output file to the right size and mmap it. Set |
d427b66a JB |
753 | * pointers to various interesting objects. stat_buf still has |
754 | * old_file data. | |
755 | */ | |
756 | ||
757 | new_file = open (new_name, O_RDWR | O_CREAT, 0666); | |
758 | if (new_file < 0) | |
d7cb42c3 | 759 | fatal ("Can't creat (%s): errno %d\n", new_name, errno); |
d427b66a JB |
760 | |
761 | new_file_size = stat_buf.st_size + old_file_h->e_shentsize + new_data2_size; | |
762 | ||
763 | if (ftruncate (new_file, new_file_size)) | |
d7cb42c3 | 764 | fatal ("Can't ftruncate (%s): errno %d\n", new_name, errno); |
d427b66a | 765 | |
04f903c0 | 766 | #ifdef UNEXEC_USE_MAP_PRIVATE |
89b95605 RS |
767 | new_base = mmap ((caddr_t) 0, new_file_size, PROT_READ | PROT_WRITE, |
768 | MAP_PRIVATE, new_file, 0); | |
04f903c0 | 769 | #else |
89b95605 RS |
770 | new_base = mmap ((caddr_t) 0, new_file_size, PROT_READ | PROT_WRITE, |
771 | MAP_SHARED, new_file, 0); | |
04f903c0 | 772 | #endif |
d427b66a JB |
773 | |
774 | if (new_base == (caddr_t) -1) | |
d7cb42c3 | 775 | fatal ("Can't mmap (%s): errno %d\n", new_name, errno); |
d427b66a | 776 | |
265b2695 RS |
777 | new_file_h = (ElfW(Ehdr) *) new_base; |
778 | new_program_h = (ElfW(Phdr) *) ((byte *) new_base + old_file_h->e_phoff); | |
779 | new_section_h = (ElfW(Shdr) *) | |
d427b66a JB |
780 | ((byte *) new_base + old_file_h->e_shoff + new_data2_size); |
781 | ||
782 | /* Make our new file, program and section headers as copies of the | |
783 | * originals. | |
784 | */ | |
785 | ||
786 | memcpy (new_file_h, old_file_h, old_file_h->e_ehsize); | |
787 | memcpy (new_program_h, old_program_h, | |
788 | old_file_h->e_phnum * old_file_h->e_phentsize); | |
e40c4104 RS |
789 | |
790 | /* Modify the e_shstrndx if necessary. */ | |
791 | PATCH_INDEX (new_file_h->e_shstrndx); | |
d427b66a JB |
792 | |
793 | /* Fix up file header. We'll add one section. Section header is | |
794 | * further away now. | |
795 | */ | |
796 | ||
797 | new_file_h->e_shoff += new_data2_size; | |
798 | new_file_h->e_shnum += 1; | |
799 | ||
800 | #ifdef DEBUG | |
d283640e | 801 | fprintf (stderr, "Old section offset %x\n", old_file_h->e_shoff); |
d427b66a | 802 | fprintf (stderr, "Old section count %d\n", old_file_h->e_shnum); |
d283640e | 803 | fprintf (stderr, "New section offset %x\n", new_file_h->e_shoff); |
d427b66a JB |
804 | fprintf (stderr, "New section count %d\n", new_file_h->e_shnum); |
805 | #endif | |
806 | ||
807 | /* Fix up a new program header. Extend the writable data segment so | |
808 | * that the bss area is covered too. Find that segment by looking | |
809 | * for a segment that ends just before the .bss area. Make sure | |
810 | * that no segments are above the new .data2. Put a loop at the end | |
811 | * to adjust the offset and address of any segment that is above | |
812 | * data2, just in case we decide to allow this later. | |
813 | */ | |
814 | ||
815 | for (n = new_file_h->e_phnum - 1; n >= 0; n--) | |
816 | { | |
e40c4104 | 817 | /* Compute maximum of all requirements for alignment of section. */ |
bc597cc7 | 818 | ElfW(Word) alignment = (NEW_PROGRAM_H (n)).p_align; |
e40c4104 RS |
819 | if ((OLD_SECTION_H (old_bss_index)).sh_addralign > alignment) |
820 | alignment = OLD_SECTION_H (old_bss_index).sh_addralign; | |
821 | ||
52da6a59 | 822 | #ifdef __sgi |
bc597cc7 KH |
823 | /* According to r02kar@x4u2.desy.de (Karsten Kuenne) |
824 | and oliva@gnu.org (Alexandre Oliva), on IRIX 5.2, we | |
825 | always get "Program segment above .bss" when dumping | |
826 | when the executable doesn't have an sbss section. */ | |
827 | if (old_sbss_index != -1) | |
52da6a59 | 828 | #endif /* __sgi */ |
9240b21d | 829 | if (NEW_PROGRAM_H (n).p_vaddr + NEW_PROGRAM_H (n).p_filesz |
bc597cc7 KH |
830 | > (old_sbss_index == -1 |
831 | ? old_bss_addr | |
832 | : round_up (old_bss_addr, alignment))) | |
833 | fatal ("Program segment above .bss in %s\n", old_name, 0); | |
d427b66a | 834 | |
d7cb42c3 | 835 | if (NEW_PROGRAM_H (n).p_type == PT_LOAD |
e40c4104 RS |
836 | && (round_up ((NEW_PROGRAM_H (n)).p_vaddr |
837 | + (NEW_PROGRAM_H (n)).p_filesz, | |
838 | alignment) | |
839 | == round_up (old_bss_addr, alignment))) | |
d427b66a JB |
840 | break; |
841 | } | |
842 | if (n < 0) | |
843 | fatal ("Couldn't find segment next to .bss in %s\n", old_name, 0); | |
844 | ||
c1937d6a AS |
845 | /* Make sure that the size includes any padding before the old .bss |
846 | section. */ | |
847 | NEW_PROGRAM_H (n).p_filesz = new_bss_addr - NEW_PROGRAM_H (n).p_vaddr; | |
d7cb42c3 | 848 | NEW_PROGRAM_H (n).p_memsz = NEW_PROGRAM_H (n).p_filesz; |
d427b66a JB |
849 | |
850 | #if 0 /* Maybe allow section after data2 - does this ever happen? */ | |
851 | for (n = new_file_h->e_phnum - 1; n >= 0; n--) | |
852 | { | |
d7cb42c3 RS |
853 | if (NEW_PROGRAM_H (n).p_vaddr |
854 | && NEW_PROGRAM_H (n).p_vaddr >= new_data2_addr) | |
855 | NEW_PROGRAM_H (n).p_vaddr += new_data2_size - old_bss_size; | |
d427b66a | 856 | |
d7cb42c3 RS |
857 | if (NEW_PROGRAM_H (n).p_offset >= new_data2_offset) |
858 | NEW_PROGRAM_H (n).p_offset += new_data2_size; | |
d427b66a JB |
859 | } |
860 | #endif | |
861 | ||
862 | /* Fix up section headers based on new .data2 section. Any section | |
863 | * whose offset or virtual address is after the new .data2 section | |
864 | * gets its value adjusted. .bss size becomes zero and new address | |
865 | * is set. data2 section header gets added by copying the existing | |
866 | * .data header and modifying the offset, address and size. | |
867 | */ | |
d7cb42c3 | 868 | for (old_data_index = 1; old_data_index < (int) old_file_h->e_shnum; |
d427b66a | 869 | old_data_index++) |
d7cb42c3 | 870 | if (!strcmp (old_section_names + OLD_SECTION_H (old_data_index).sh_name, |
d427b66a JB |
871 | ".data")) |
872 | break; | |
873 | if (old_data_index == old_file_h->e_shnum) | |
874 | fatal ("Can't find .data in %s.\n", old_name, 0); | |
875 | ||
994a65f3 | 876 | /* Walk through all section headers, insert the new data2 section right |
e40c4104 | 877 | before the new bss section. */ |
d7cb42c3 | 878 | for (n = 1, nn = 1; n < (int) old_file_h->e_shnum; n++, nn++) |
d427b66a JB |
879 | { |
880 | caddr_t src; | |
9240b21d RS |
881 | /* If it is (s)bss section, insert the new data2 section before it. */ |
882 | /* new_data2_index is the index of either old_sbss or old_bss, that was | |
883 | chosen as a section for new_data2. */ | |
bc597cc7 | 884 | if (n == new_data2_index) |
e40c4104 RS |
885 | { |
886 | /* Steal the data section header for this data2 section. */ | |
d7cb42c3 | 887 | memcpy (&NEW_SECTION_H (nn), &OLD_SECTION_H (old_data_index), |
e40c4104 | 888 | new_file_h->e_shentsize); |
994a65f3 | 889 | |
d7cb42c3 RS |
890 | NEW_SECTION_H (nn).sh_addr = new_data2_addr; |
891 | NEW_SECTION_H (nn).sh_offset = new_data2_offset; | |
892 | NEW_SECTION_H (nn).sh_size = new_data2_size; | |
e40c4104 RS |
893 | /* Use the bss section's alignment. This will assure that the |
894 | new data2 section always be placed in the same spot as the old | |
895 | bss section by any other application. */ | |
d7cb42c3 | 896 | NEW_SECTION_H (nn).sh_addralign = OLD_SECTION_H (n).sh_addralign; |
e40c4104 RS |
897 | |
898 | /* Now copy over what we have in the memory now. */ | |
994a65f3 RM |
899 | memcpy (NEW_SECTION_H (nn).sh_offset + new_base, |
900 | (caddr_t) OLD_SECTION_H (n).sh_addr, | |
e40c4104 RS |
901 | new_data2_size); |
902 | nn++; | |
903 | } | |
994a65f3 RM |
904 | |
905 | memcpy (&NEW_SECTION_H (nn), &OLD_SECTION_H (n), | |
e40c4104 | 906 | old_file_h->e_shentsize); |
9240b21d RS |
907 | |
908 | if (n == old_bss_index | |
9240b21d RS |
909 | /* The new bss and sbss section's size is zero, and its file offset |
910 | and virtual address should be off by NEW_DATA2_SIZE. */ | |
911 | || n == old_sbss_index | |
9240b21d | 912 | ) |
e40c4104 | 913 | { |
bc597cc7 KH |
914 | /* NN should be `old_s?bss_index + 1' at this point. */ |
915 | NEW_SECTION_H (nn).sh_offset = | |
916 | NEW_SECTION_H (new_data2_index).sh_offset + new_data2_size; | |
917 | NEW_SECTION_H (nn).sh_addr = | |
918 | NEW_SECTION_H (new_data2_index).sh_addr + new_data2_size; | |
e40c4104 | 919 | /* Let the new bss section address alignment be the same as the |
994a65f3 | 920 | section address alignment followed the old bss section, so |
e40c4104 | 921 | this section will be placed in exactly the same place. */ |
d7cb42c3 RS |
922 | NEW_SECTION_H (nn).sh_addralign = OLD_SECTION_H (nn).sh_addralign; |
923 | NEW_SECTION_H (nn).sh_size = 0; | |
e40c4104 | 924 | } |
85b2e0ee RS |
925 | else |
926 | { | |
927 | /* Any section that was original placed AFTER the bss | |
928 | section should now be off by NEW_DATA2_SIZE. */ | |
ea083293 RS |
929 | #ifdef SOLARIS_POWERPC |
930 | /* On PPC Reference Platform running Solaris 2.5.1 | |
931 | the plt section is also of type NOBI like the bss section. | |
932 | (not really stored) and therefore sections after the bss | |
933 | section start at the plt offset. The plt section is always | |
934 | the one just before the bss section. | |
935 | It would be better to put the new data section before | |
936 | the .plt section, or use libelf instead. | |
937 | Erik Deumens, deumens@qtp.ufl.edu. */ | |
938 | if (NEW_SECTION_H (nn).sh_offset | |
939 | >= OLD_SECTION_H (old_bss_index-1).sh_offset) | |
940 | NEW_SECTION_H (nn).sh_offset += new_data2_size; | |
941 | #else | |
52da6a59 | 942 | if (round_up (NEW_SECTION_H (nn).sh_offset, |
faee8ef0 | 943 | OLD_SECTION_H (old_bss_index).sh_addralign) |
52da6a59 | 944 | >= new_data2_offset) |
85b2e0ee | 945 | NEW_SECTION_H (nn).sh_offset += new_data2_size; |
ea083293 | 946 | #endif |
85b2e0ee RS |
947 | /* Any section that was originally placed after the section |
948 | header table should now be off by the size of one section | |
949 | header table entry. */ | |
950 | if (NEW_SECTION_H (nn).sh_offset > new_file_h->e_shoff) | |
951 | NEW_SECTION_H (nn).sh_offset += new_file_h->e_shentsize; | |
952 | } | |
953 | ||
e40c4104 | 954 | /* If any section hdr refers to the section after the new .data |
994a65f3 | 955 | section, make it refer to next one because we have inserted |
8917361f | 956 | a new section in between. */ |
994a65f3 | 957 | |
d7cb42c3 | 958 | PATCH_INDEX (NEW_SECTION_H (nn).sh_link); |
8917361f RS |
959 | /* For symbol tables, info is a symbol table index, |
960 | so don't change it. */ | |
961 | if (NEW_SECTION_H (nn).sh_type != SHT_SYMTAB | |
962 | && NEW_SECTION_H (nn).sh_type != SHT_DYNSYM) | |
963 | PATCH_INDEX (NEW_SECTION_H (nn).sh_info); | |
1b963cdd DL |
964 | |
965 | if (old_sbss_index != -1) | |
966 | if (!strcmp (old_section_names + NEW_SECTION_H (nn).sh_name, ".sbss")) | |
967 | { | |
968 | NEW_SECTION_H (nn).sh_offset = | |
969 | round_up (NEW_SECTION_H (nn).sh_offset, | |
970 | NEW_SECTION_H (nn).sh_addralign); | |
971 | NEW_SECTION_H (nn).sh_type = SHT_PROGBITS; | |
972 | } | |
8917361f RS |
973 | |
974 | /* Now, start to copy the content of sections. */ | |
d7cb42c3 RS |
975 | if (NEW_SECTION_H (nn).sh_type == SHT_NULL |
976 | || NEW_SECTION_H (nn).sh_type == SHT_NOBITS) | |
d427b66a | 977 | continue; |
994a65f3 | 978 | |
e40c4104 | 979 | /* Write out the sections. .data and .data1 (and data2, called |
8917361f RS |
980 | ".data" in the strings table) get copied from the current process |
981 | instead of the old file. */ | |
d7cb42c3 | 982 | if (!strcmp (old_section_names + NEW_SECTION_H (n).sh_name, ".data") |
9240b21d RS |
983 | || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name), |
984 | ".sdata") | |
985 | || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name), | |
986 | ".lit4") | |
987 | || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name), | |
988 | ".lit8") | |
bc597cc7 KH |
989 | || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name), |
990 | ".sdata1") | |
d7cb42c3 | 991 | || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name), |
1b963cdd DL |
992 | ".data1") |
993 | || !strcmp (old_section_names + NEW_SECTION_H (nn).sh_name, | |
994 | ".sbss")) | |
d7cb42c3 | 995 | src = (caddr_t) OLD_SECTION_H (n).sh_addr; |
d427b66a | 996 | else |
d7cb42c3 | 997 | src = old_base + OLD_SECTION_H (n).sh_offset; |
994a65f3 | 998 | |
d7cb42c3 RS |
999 | memcpy (NEW_SECTION_H (nn).sh_offset + new_base, src, |
1000 | NEW_SECTION_H (nn).sh_size); | |
e40c4104 | 1001 | |
265b2695 RS |
1002 | #ifdef __alpha__ |
1003 | /* Update Alpha COFF symbol table: */ | |
1004 | if (strcmp (old_section_names + OLD_SECTION_H (n).sh_name, ".mdebug") | |
1005 | == 0) | |
1006 | { | |
1007 | pHDRR symhdr = (pHDRR) (NEW_SECTION_H (nn).sh_offset + new_base); | |
1008 | ||
1009 | symhdr->cbLineOffset += new_data2_size; | |
1010 | symhdr->cbDnOffset += new_data2_size; | |
1011 | symhdr->cbPdOffset += new_data2_size; | |
1012 | symhdr->cbSymOffset += new_data2_size; | |
1013 | symhdr->cbOptOffset += new_data2_size; | |
1014 | symhdr->cbAuxOffset += new_data2_size; | |
1015 | symhdr->cbSsOffset += new_data2_size; | |
1016 | symhdr->cbSsExtOffset += new_data2_size; | |
1017 | symhdr->cbFdOffset += new_data2_size; | |
1018 | symhdr->cbRfdOffset += new_data2_size; | |
1019 | symhdr->cbExtOffset += new_data2_size; | |
1020 | } | |
1021 | #endif /* __alpha__ */ | |
1022 | ||
9240b21d | 1023 | #if defined (__sony_news) && defined (_SYSTYPE_SYSV) |
52da6a59 GM |
1024 | if (NEW_SECTION_H (nn).sh_type == SHT_MIPS_DEBUG |
1025 | && old_mdebug_index != -1) | |
9240b21d RS |
1026 | { |
1027 | int diff = NEW_SECTION_H(nn).sh_offset | |
1028 | - OLD_SECTION_H(old_mdebug_index).sh_offset; | |
1029 | HDRR *phdr = (HDRR *)(NEW_SECTION_H (nn).sh_offset + new_base); | |
1030 | ||
1031 | if (diff) | |
1032 | { | |
1033 | phdr->cbLineOffset += diff; | |
1034 | phdr->cbDnOffset += diff; | |
1035 | phdr->cbPdOffset += diff; | |
1036 | phdr->cbSymOffset += diff; | |
1037 | phdr->cbOptOffset += diff; | |
1038 | phdr->cbAuxOffset += diff; | |
1039 | phdr->cbSsOffset += diff; | |
1040 | phdr->cbSsExtOffset += diff; | |
1041 | phdr->cbFdOffset += diff; | |
1042 | phdr->cbRfdOffset += diff; | |
1043 | phdr->cbExtOffset += diff; | |
1044 | } | |
1045 | } | |
1046 | #endif /* __sony_news && _SYSTYPE_SYSV */ | |
bc597cc7 KH |
1047 | |
1048 | #if __sgi | |
1049 | /* Adjust the HDRR offsets in .mdebug and copy the | |
1050 | line data if it's in its usual 'hole' in the object. | |
1051 | Makes the new file debuggable with dbx. | |
1052 | patches up two problems: the absolute file offsets | |
1053 | in the HDRR record of .mdebug (see /usr/include/syms.h), and | |
1054 | the ld bug that gets the line table in a hole in the | |
1055 | elf file rather than in the .mdebug section proper. | |
1056 | David Anderson. davea@sgi.com Jan 16,1994. */ | |
1057 | if (n == old_mdebug_index) | |
1058 | { | |
1059 | #define MDEBUGADJUST(__ct,__fileaddr) \ | |
1060 | if (n_phdrr->__ct > 0) \ | |
1061 | { \ | |
1062 | n_phdrr->__fileaddr += movement; \ | |
1063 | } | |
1064 | ||
1065 | HDRR * o_phdrr = (HDRR *)((byte *)old_base + OLD_SECTION_H (n).sh_offset); | |
1066 | HDRR * n_phdrr = (HDRR *)((byte *)new_base + NEW_SECTION_H (nn).sh_offset); | |
1067 | unsigned movement = new_data2_size; | |
1068 | ||
1069 | MDEBUGADJUST (idnMax, cbDnOffset); | |
1070 | MDEBUGADJUST (ipdMax, cbPdOffset); | |
1071 | MDEBUGADJUST (isymMax, cbSymOffset); | |
1072 | MDEBUGADJUST (ioptMax, cbOptOffset); | |
1073 | MDEBUGADJUST (iauxMax, cbAuxOffset); | |
1074 | MDEBUGADJUST (issMax, cbSsOffset); | |
1075 | MDEBUGADJUST (issExtMax, cbSsExtOffset); | |
1076 | MDEBUGADJUST (ifdMax, cbFdOffset); | |
1077 | MDEBUGADJUST (crfd, cbRfdOffset); | |
1078 | MDEBUGADJUST (iextMax, cbExtOffset); | |
1079 | /* The Line Section, being possible off in a hole of the object, | |
1080 | requires special handling. */ | |
1081 | if (n_phdrr->cbLine > 0) | |
1082 | { | |
1083 | if (o_phdrr->cbLineOffset > (OLD_SECTION_H (n).sh_offset | |
1084 | + OLD_SECTION_H (n).sh_size)) | |
1085 | { | |
1086 | /* line data is in a hole in elf. do special copy and adjust | |
1087 | for this ld mistake. | |
1088 | */ | |
1089 | n_phdrr->cbLineOffset += movement; | |
1090 | ||
1091 | memcpy (n_phdrr->cbLineOffset + new_base, | |
1092 | o_phdrr->cbLineOffset + old_base, n_phdrr->cbLine); | |
1093 | } | |
1094 | else | |
1095 | { | |
1096 | /* somehow line data is in .mdebug as it is supposed to be. */ | |
1097 | MDEBUGADJUST (cbLine, cbLineOffset); | |
1098 | } | |
1099 | } | |
1100 | } | |
1101 | #endif /* __sgi */ | |
1102 | ||
8917361f | 1103 | /* If it is the symbol table, its st_shndx field needs to be patched. */ |
d7cb42c3 RS |
1104 | if (NEW_SECTION_H (nn).sh_type == SHT_SYMTAB |
1105 | || NEW_SECTION_H (nn).sh_type == SHT_DYNSYM) | |
e40c4104 | 1106 | { |
265b2695 | 1107 | ElfW(Shdr) *spt = &NEW_SECTION_H (nn); |
e40c4104 | 1108 | unsigned int num = spt->sh_size / spt->sh_entsize; |
265b2695 | 1109 | ElfW(Sym) * sym = (ElfW(Sym) *) (NEW_SECTION_H (nn).sh_offset + |
e40c4104 RS |
1110 | new_base); |
1111 | for (; num--; sym++) | |
1112 | { | |
1113 | if ((sym->st_shndx == SHN_UNDEF) | |
1114 | || (sym->st_shndx == SHN_ABS) | |
1115 | || (sym->st_shndx == SHN_COMMON)) | |
1116 | continue; | |
994a65f3 | 1117 | |
d7cb42c3 | 1118 | PATCH_INDEX (sym->st_shndx); |
e40c4104 RS |
1119 | } |
1120 | } | |
d427b66a JB |
1121 | } |
1122 | ||
8917361f | 1123 | /* Update the symbol values of _edata and _end. */ |
8bf761ce RS |
1124 | for (n = new_file_h->e_shnum - 1; n; n--) |
1125 | { | |
1126 | byte *symnames; | |
265b2695 | 1127 | ElfW(Sym) *symp, *symendp; |
8bf761ce RS |
1128 | |
1129 | if (NEW_SECTION_H (n).sh_type != SHT_DYNSYM | |
1130 | && NEW_SECTION_H (n).sh_type != SHT_SYMTAB) | |
1131 | continue; | |
1132 | ||
8c1e9afe KH |
1133 | symnames = ((byte *) new_base |
1134 | + NEW_SECTION_H (NEW_SECTION_H (n).sh_link).sh_offset); | |
265b2695 RS |
1135 | symp = (ElfW(Sym) *) (NEW_SECTION_H (n).sh_offset + new_base); |
1136 | symendp = (ElfW(Sym) *) ((byte *)symp + NEW_SECTION_H (n).sh_size); | |
8bf761ce RS |
1137 | |
1138 | for (; symp < symendp; symp ++) | |
1139 | if (strcmp ((char *) (symnames + symp->st_name), "_end") == 0 | |
2e1ddb87 RS |
1140 | || strcmp ((char *) (symnames + symp->st_name), "end") == 0 |
1141 | || strcmp ((char *) (symnames + symp->st_name), "_edata") == 0 | |
1142 | || strcmp ((char *) (symnames + symp->st_name), "edata") == 0) | |
8bf761ce RS |
1143 | memcpy (&symp->st_value, &new_bss_addr, sizeof (new_bss_addr)); |
1144 | } | |
1145 | ||
48240339 KH |
1146 | /* This loop seeks out relocation sections for the data section, so |
1147 | that it can undo relocations performed by the runtime linker. */ | |
1148 | for (n = new_file_h->e_shnum - 1; n; n--) | |
1149 | { | |
265b2695 | 1150 | ElfW(Shdr) section = NEW_SECTION_H (n); |
48240339 KH |
1151 | switch (section.sh_type) { |
1152 | default: | |
1153 | break; | |
1154 | case SHT_REL: | |
1155 | case SHT_RELA: | |
994a65f3 RM |
1156 | /* This code handles two different size structs, but there should |
1157 | be no harm in that provided that r_offset is always the first | |
1158 | member. */ | |
48240339 KH |
1159 | nn = section.sh_info; |
1160 | if (!strcmp (old_section_names + NEW_SECTION_H (nn).sh_name, ".data") | |
bc597cc7 KH |
1161 | || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name), |
1162 | ".sdata") | |
1163 | || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name), | |
1164 | ".lit4") | |
1165 | || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name), | |
1166 | ".lit8") | |
bc597cc7 KH |
1167 | || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name), |
1168 | ".sdata1") | |
48240339 KH |
1169 | || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name), |
1170 | ".data1")) | |
1171 | { | |
265b2695 | 1172 | ElfW(Addr) offset = NEW_SECTION_H (nn).sh_addr - |
48240339 KH |
1173 | NEW_SECTION_H (nn).sh_offset; |
1174 | caddr_t reloc = old_base + section.sh_offset, end; | |
1175 | for (end = reloc + section.sh_size; reloc < end; | |
1176 | reloc += section.sh_entsize) | |
1177 | { | |
265b2695 RS |
1178 | ElfW(Addr) addr = ((ElfW(Rel) *) reloc)->r_offset - offset; |
1179 | #ifdef __alpha__ | |
1180 | /* The Alpha ELF binutils currently have a bug that | |
1181 | sometimes results in relocs that contain all | |
1182 | zeroes. Work around this for now... */ | |
1183 | if (((ElfW(Rel) *) reloc)->r_offset == 0) | |
1184 | continue; | |
1185 | #endif | |
1186 | memcpy (new_base + addr, old_base + addr, sizeof(ElfW(Addr))); | |
48240339 KH |
1187 | } |
1188 | } | |
1189 | break; | |
1190 | } | |
1191 | } | |
48240339 | 1192 | |
04f903c0 KH |
1193 | #ifdef UNEXEC_USE_MAP_PRIVATE |
1194 | if (lseek (new_file, 0, SEEK_SET) == -1) | |
1195 | fatal ("Can't rewind (%s): errno %d\n", new_name, errno); | |
1196 | ||
1197 | if (write (new_file, new_base, new_file_size) != new_file_size) | |
1198 | fatal ("Can't write (%s): errno %d\n", new_name, errno); | |
1199 | #endif | |
1200 | ||
8917361f | 1201 | /* Close the files and make the new file executable. */ |
d427b66a JB |
1202 | |
1203 | if (close (old_file)) | |
d7cb42c3 | 1204 | fatal ("Can't close (%s): errno %d\n", old_name, errno); |
d427b66a JB |
1205 | |
1206 | if (close (new_file)) | |
d7cb42c3 | 1207 | fatal ("Can't close (%s): errno %d\n", new_name, errno); |
d427b66a JB |
1208 | |
1209 | if (stat (new_name, &stat_buf) == -1) | |
d7cb42c3 | 1210 | fatal ("Can't stat (%s): errno %d\n", new_name, errno); |
d427b66a JB |
1211 | |
1212 | n = umask (777); | |
1213 | umask (n); | |
1214 | stat_buf.st_mode |= 0111 & ~n; | |
1215 | if (chmod (new_name, stat_buf.st_mode) == -1) | |
d7cb42c3 | 1216 | fatal ("Can't chmod (%s): errno %d\n", new_name, errno); |
d427b66a | 1217 | } |