Commit | Line | Data |
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e40c4104 RS |
1 | /* Copyright (C) 1985, 1986, 1987, 1988, 1990, 1992 |
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 | * | |
55 | * Specifying zero for data_start means the boundary between text and data | |
56 | * should not be the same as when the program was loaded. | |
57 | * If NO_REMAP is defined, the argument data_start is ignored and the | |
58 | * segment boundaries are never changed. | |
59 | * | |
60 | * Bss_start indicates how much of the data segment is to be saved in the | |
61 | * a.out file and restored when the program is executed. It gives the lowest | |
62 | * unsaved address, and is rounded up to a page boundary. The default when 0 | |
63 | * is given assumes that the entire data segment is to be stored, including | |
64 | * the previous data and bss as well as any additional storage allocated with | |
65 | * break (2). | |
66 | * | |
67 | * The new file is set up to start at entry_address. | |
68 | * | |
69 | * If you make improvements I'd like to get them too. | |
70 | * harpo!utah-cs!thomas, thomas@Utah-20 | |
71 | * | |
72 | */ | |
73 | ||
74 | /* Even more heavily modified by james@bigtex.cactus.org of Dell Computer Co. | |
75 | * ELF support added. | |
76 | * | |
77 | * Basic theory: the data space of the running process needs to be | |
78 | * dumped to the output file. Normally we would just enlarge the size | |
79 | * of .data, scooting everything down. But we can't do that in ELF, | |
80 | * because there is often something between the .data space and the | |
81 | * .bss space. | |
82 | * | |
83 | * In the temacs dump below, notice that the Global Offset Table | |
84 | * (.got) and the Dynamic link data (.dynamic) come between .data1 and | |
85 | * .bss. It does not work to overlap .data with these fields. | |
86 | * | |
87 | * The solution is to create a new .data segment. This segment is | |
88 | * filled with data from the current process. Since the contents of | |
89 | * various sections refer to sections by index, the new .data segment | |
90 | * is made the last in the table to avoid changing any existing index. | |
91 | ||
92 | * This is an example of how the section headers are changed. "Addr" | |
93 | * is a process virtual address. "Offset" is a file offset. | |
94 | ||
95 | raid:/nfs/raid/src/dist-18.56/src> dump -h temacs | |
96 | ||
97 | temacs: | |
98 | ||
99 | **** SECTION HEADER TABLE **** | |
100 | [No] Type Flags Addr Offset Size Name | |
101 | Link Info Adralgn Entsize | |
102 | ||
103 | [1] 1 2 0x80480d4 0xd4 0x13 .interp | |
994a65f3 | 104 | 0 0 0x1 0 |
d427b66a JB |
105 | |
106 | [2] 5 2 0x80480e8 0xe8 0x388 .hash | |
994a65f3 | 107 | 3 0 0x4 0x4 |
d427b66a JB |
108 | |
109 | [3] 11 2 0x8048470 0x470 0x7f0 .dynsym | |
994a65f3 | 110 | 4 1 0x4 0x10 |
d427b66a JB |
111 | |
112 | [4] 3 2 0x8048c60 0xc60 0x3ad .dynstr | |
994a65f3 | 113 | 0 0 0x1 0 |
d427b66a JB |
114 | |
115 | [5] 9 2 0x8049010 0x1010 0x338 .rel.plt | |
994a65f3 | 116 | 3 7 0x4 0x8 |
d427b66a JB |
117 | |
118 | [6] 1 6 0x8049348 0x1348 0x3 .init | |
994a65f3 | 119 | 0 0 0x4 0 |
d427b66a JB |
120 | |
121 | [7] 1 6 0x804934c 0x134c 0x680 .plt | |
994a65f3 | 122 | 0 0 0x4 0x4 |
d427b66a JB |
123 | |
124 | [8] 1 6 0x80499cc 0x19cc 0x3c56f .text | |
994a65f3 | 125 | 0 0 0x4 0 |
d427b66a JB |
126 | |
127 | [9] 1 6 0x8085f3c 0x3df3c 0x3 .fini | |
994a65f3 | 128 | 0 0 0x4 0 |
d427b66a JB |
129 | |
130 | [10] 1 2 0x8085f40 0x3df40 0x69c .rodata | |
994a65f3 | 131 | 0 0 0x4 0 |
d427b66a JB |
132 | |
133 | [11] 1 2 0x80865dc 0x3e5dc 0xd51 .rodata1 | |
994a65f3 | 134 | 0 0 0x4 0 |
d427b66a JB |
135 | |
136 | [12] 1 3 0x8088330 0x3f330 0x20afc .data | |
994a65f3 | 137 | 0 0 0x4 0 |
d427b66a JB |
138 | |
139 | [13] 1 3 0x80a8e2c 0x5fe2c 0x89d .data1 | |
994a65f3 | 140 | 0 0 0x4 0 |
d427b66a JB |
141 | |
142 | [14] 1 3 0x80a96cc 0x606cc 0x1a8 .got | |
994a65f3 | 143 | 0 0 0x4 0x4 |
d427b66a JB |
144 | |
145 | [15] 6 3 0x80a9874 0x60874 0x80 .dynamic | |
994a65f3 | 146 | 4 0 0x4 0x8 |
d427b66a JB |
147 | |
148 | [16] 8 3 0x80a98f4 0x608f4 0x449c .bss | |
994a65f3 | 149 | 0 0 0x4 0 |
d427b66a JB |
150 | |
151 | [17] 2 0 0 0x608f4 0x9b90 .symtab | |
994a65f3 | 152 | 18 371 0x4 0x10 |
d427b66a JB |
153 | |
154 | [18] 3 0 0 0x6a484 0x8526 .strtab | |
994a65f3 | 155 | 0 0 0x1 0 |
d427b66a JB |
156 | |
157 | [19] 3 0 0 0x729aa 0x93 .shstrtab | |
994a65f3 | 158 | 0 0 0x1 0 |
d427b66a JB |
159 | |
160 | [20] 1 0 0 0x72a3d 0x68b7 .comment | |
994a65f3 | 161 | 0 0 0x1 0 |
d427b66a JB |
162 | |
163 | raid:/nfs/raid/src/dist-18.56/src> dump -h xemacs | |
164 | ||
165 | xemacs: | |
166 | ||
167 | **** SECTION HEADER TABLE **** | |
168 | [No] Type Flags Addr Offset Size Name | |
169 | Link Info Adralgn Entsize | |
170 | ||
171 | [1] 1 2 0x80480d4 0xd4 0x13 .interp | |
994a65f3 | 172 | 0 0 0x1 0 |
d427b66a JB |
173 | |
174 | [2] 5 2 0x80480e8 0xe8 0x388 .hash | |
994a65f3 | 175 | 3 0 0x4 0x4 |
d427b66a JB |
176 | |
177 | [3] 11 2 0x8048470 0x470 0x7f0 .dynsym | |
994a65f3 | 178 | 4 1 0x4 0x10 |
d427b66a JB |
179 | |
180 | [4] 3 2 0x8048c60 0xc60 0x3ad .dynstr | |
994a65f3 | 181 | 0 0 0x1 0 |
d427b66a JB |
182 | |
183 | [5] 9 2 0x8049010 0x1010 0x338 .rel.plt | |
994a65f3 | 184 | 3 7 0x4 0x8 |
d427b66a JB |
185 | |
186 | [6] 1 6 0x8049348 0x1348 0x3 .init | |
994a65f3 | 187 | 0 0 0x4 0 |
d427b66a JB |
188 | |
189 | [7] 1 6 0x804934c 0x134c 0x680 .plt | |
994a65f3 | 190 | 0 0 0x4 0x4 |
d427b66a JB |
191 | |
192 | [8] 1 6 0x80499cc 0x19cc 0x3c56f .text | |
994a65f3 | 193 | 0 0 0x4 0 |
d427b66a JB |
194 | |
195 | [9] 1 6 0x8085f3c 0x3df3c 0x3 .fini | |
994a65f3 | 196 | 0 0 0x4 0 |
d427b66a JB |
197 | |
198 | [10] 1 2 0x8085f40 0x3df40 0x69c .rodata | |
994a65f3 | 199 | 0 0 0x4 0 |
d427b66a JB |
200 | |
201 | [11] 1 2 0x80865dc 0x3e5dc 0xd51 .rodata1 | |
994a65f3 | 202 | 0 0 0x4 0 |
d427b66a JB |
203 | |
204 | [12] 1 3 0x8088330 0x3f330 0x20afc .data | |
994a65f3 | 205 | 0 0 0x4 0 |
d427b66a JB |
206 | |
207 | [13] 1 3 0x80a8e2c 0x5fe2c 0x89d .data1 | |
994a65f3 | 208 | 0 0 0x4 0 |
d427b66a JB |
209 | |
210 | [14] 1 3 0x80a96cc 0x606cc 0x1a8 .got | |
994a65f3 | 211 | 0 0 0x4 0x4 |
d427b66a JB |
212 | |
213 | [15] 6 3 0x80a9874 0x60874 0x80 .dynamic | |
994a65f3 | 214 | 4 0 0x4 0x8 |
d427b66a JB |
215 | |
216 | [16] 8 3 0x80c6800 0x7d800 0 .bss | |
994a65f3 | 217 | 0 0 0x4 0 |
d427b66a JB |
218 | |
219 | [17] 2 0 0 0x7d800 0x9b90 .symtab | |
994a65f3 | 220 | 18 371 0x4 0x10 |
d427b66a JB |
221 | |
222 | [18] 3 0 0 0x87390 0x8526 .strtab | |
994a65f3 | 223 | 0 0 0x1 0 |
d427b66a JB |
224 | |
225 | [19] 3 0 0 0x8f8b6 0x93 .shstrtab | |
994a65f3 | 226 | 0 0 0x1 0 |
d427b66a JB |
227 | |
228 | [20] 1 0 0 0x8f949 0x68b7 .comment | |
994a65f3 | 229 | 0 0 0x1 0 |
d427b66a JB |
230 | |
231 | [21] 1 3 0x80a98f4 0x608f4 0x1cf0c .data | |
994a65f3 | 232 | 0 0 0x4 0 |
d427b66a JB |
233 | |
234 | * This is an example of how the file header is changed. "Shoff" is | |
235 | * the section header offset within the file. Since that table is | |
236 | * after the new .data section, it is moved. "Shnum" is the number of | |
237 | * sections, which we increment. | |
238 | * | |
239 | * "Phoff" is the file offset to the program header. "Phentsize" and | |
240 | * "Shentsz" are the program and section header entries sizes respectively. | |
241 | * These can be larger than the apparent struct sizes. | |
242 | ||
243 | raid:/nfs/raid/src/dist-18.56/src> dump -f temacs | |
244 | ||
245 | temacs: | |
246 | ||
247 | **** ELF HEADER **** | |
248 | Class Data Type Machine Version | |
249 | Entry Phoff Shoff Flags Ehsize | |
250 | Phentsize Phnum Shentsz Shnum Shstrndx | |
251 | ||
252 | 1 1 2 3 1 | |
253 | 0x80499cc 0x34 0x792f4 0 0x34 | |
254 | 0x20 5 0x28 21 19 | |
255 | ||
256 | raid:/nfs/raid/src/dist-18.56/src> dump -f xemacs | |
257 | ||
258 | xemacs: | |
259 | ||
260 | **** ELF HEADER **** | |
261 | Class Data Type Machine Version | |
262 | Entry Phoff Shoff Flags Ehsize | |
263 | Phentsize Phnum Shentsz Shnum Shstrndx | |
264 | ||
265 | 1 1 2 3 1 | |
266 | 0x80499cc 0x34 0x96200 0 0x34 | |
267 | 0x20 5 0x28 22 19 | |
268 | ||
269 | * These are the program headers. "Offset" is the file offset to the | |
270 | * segment. "Vaddr" is the memory load address. "Filesz" is the | |
271 | * segment size as it appears in the file, and "Memsz" is the size in | |
272 | * memory. Below, the third segment is the code and the fourth is the | |
273 | * data: the difference between Filesz and Memsz is .bss | |
274 | ||
275 | raid:/nfs/raid/src/dist-18.56/src> dump -o temacs | |
276 | ||
277 | temacs: | |
278 | ***** PROGRAM EXECUTION HEADER ***** | |
279 | Type Offset Vaddr Paddr | |
280 | Filesz Memsz Flags Align | |
281 | ||
994a65f3 RM |
282 | 6 0x34 0x8048034 0 |
283 | 0xa0 0xa0 5 0 | |
d427b66a | 284 | |
994a65f3 RM |
285 | 3 0xd4 0 0 |
286 | 0x13 0 4 0 | |
d427b66a | 287 | |
994a65f3 RM |
288 | 1 0x34 0x8048034 0 |
289 | 0x3f2f9 0x3f2f9 5 0x1000 | |
d427b66a | 290 | |
994a65f3 RM |
291 | 1 0x3f330 0x8088330 0 |
292 | 0x215c4 0x25a60 7 0x1000 | |
d427b66a | 293 | |
994a65f3 RM |
294 | 2 0x60874 0x80a9874 0 |
295 | 0x80 0 7 0 | |
d427b66a JB |
296 | |
297 | raid:/nfs/raid/src/dist-18.56/src> dump -o xemacs | |
298 | ||
299 | xemacs: | |
300 | ***** PROGRAM EXECUTION HEADER ***** | |
301 | Type Offset Vaddr Paddr | |
302 | Filesz Memsz Flags Align | |
303 | ||
994a65f3 RM |
304 | 6 0x34 0x8048034 0 |
305 | 0xa0 0xa0 5 0 | |
d427b66a | 306 | |
994a65f3 RM |
307 | 3 0xd4 0 0 |
308 | 0x13 0 4 0 | |
d427b66a | 309 | |
994a65f3 RM |
310 | 1 0x34 0x8048034 0 |
311 | 0x3f2f9 0x3f2f9 5 0x1000 | |
d427b66a | 312 | |
994a65f3 RM |
313 | 1 0x3f330 0x8088330 0 |
314 | 0x3e4d0 0x3e4d0 7 0x1000 | |
d427b66a | 315 | |
994a65f3 RM |
316 | 2 0x60874 0x80a9874 0 |
317 | 0x80 0 7 0 | |
d427b66a JB |
318 | |
319 | ||
320 | */ | |
e40c4104 | 321 | \f |
994a65f3 RM |
322 | /* Modified by wtien@urbana.mcd.mot.com of Motorola Inc. |
323 | * | |
e40c4104 | 324 | * The above mechanism does not work if the unexeced ELF file is being |
994a65f3 | 325 | * re-layout by other applications (such as `strip'). All the applications |
e40c4104 | 326 | * that re-layout the internal of ELF will layout all sections in ascending |
994a65f3 RM |
327 | * order of their file offsets. After the re-layout, the data2 section will |
328 | * still be the LAST section in the section header vector, but its file offset | |
e40c4104 | 329 | * is now being pushed far away down, and causes part of it not to be mapped |
994a65f3 | 330 | * in (ie. not covered by the load segment entry in PHDR vector), therefore |
e40c4104 RS |
331 | * causes the new binary to fail. |
332 | * | |
333 | * The solution is to modify the unexec algorithm to insert the new data2 | |
334 | * section header right before the new bss section header, so their file | |
994a65f3 RM |
335 | * offsets will be in the ascending order. Since some of the section's (all |
336 | * sections AFTER the bss section) indexes are now changed, we also need to | |
337 | * modify some fields to make them point to the right sections. This is done | |
e40c4104 | 338 | * by macro PATCH_INDEX. All the fields that need to be patched are: |
994a65f3 | 339 | * |
e40c4104 RS |
340 | * 1. ELF header e_shstrndx field. |
341 | * 2. section header sh_link and sh_info field. | |
342 | * 3. symbol table entry st_shndx field. | |
343 | * | |
344 | * The above example now should look like: | |
345 | ||
346 | **** SECTION HEADER TABLE **** | |
347 | [No] Type Flags Addr Offset Size Name | |
348 | Link Info Adralgn Entsize | |
349 | ||
350 | [1] 1 2 0x80480d4 0xd4 0x13 .interp | |
994a65f3 | 351 | 0 0 0x1 0 |
d427b66a | 352 | |
e40c4104 | 353 | [2] 5 2 0x80480e8 0xe8 0x388 .hash |
994a65f3 | 354 | 3 0 0x4 0x4 |
e40c4104 RS |
355 | |
356 | [3] 11 2 0x8048470 0x470 0x7f0 .dynsym | |
994a65f3 | 357 | 4 1 0x4 0x10 |
e40c4104 RS |
358 | |
359 | [4] 3 2 0x8048c60 0xc60 0x3ad .dynstr | |
994a65f3 | 360 | 0 0 0x1 0 |
e40c4104 RS |
361 | |
362 | [5] 9 2 0x8049010 0x1010 0x338 .rel.plt | |
994a65f3 | 363 | 3 7 0x4 0x8 |
e40c4104 RS |
364 | |
365 | [6] 1 6 0x8049348 0x1348 0x3 .init | |
994a65f3 | 366 | 0 0 0x4 0 |
e40c4104 RS |
367 | |
368 | [7] 1 6 0x804934c 0x134c 0x680 .plt | |
994a65f3 | 369 | 0 0 0x4 0x4 |
e40c4104 RS |
370 | |
371 | [8] 1 6 0x80499cc 0x19cc 0x3c56f .text | |
994a65f3 | 372 | 0 0 0x4 0 |
e40c4104 RS |
373 | |
374 | [9] 1 6 0x8085f3c 0x3df3c 0x3 .fini | |
994a65f3 | 375 | 0 0 0x4 0 |
e40c4104 RS |
376 | |
377 | [10] 1 2 0x8085f40 0x3df40 0x69c .rodata | |
994a65f3 | 378 | 0 0 0x4 0 |
e40c4104 RS |
379 | |
380 | [11] 1 2 0x80865dc 0x3e5dc 0xd51 .rodata1 | |
994a65f3 | 381 | 0 0 0x4 0 |
e40c4104 RS |
382 | |
383 | [12] 1 3 0x8088330 0x3f330 0x20afc .data | |
994a65f3 | 384 | 0 0 0x4 0 |
e40c4104 RS |
385 | |
386 | [13] 1 3 0x80a8e2c 0x5fe2c 0x89d .data1 | |
994a65f3 | 387 | 0 0 0x4 0 |
e40c4104 RS |
388 | |
389 | [14] 1 3 0x80a96cc 0x606cc 0x1a8 .got | |
994a65f3 | 390 | 0 0 0x4 0x4 |
e40c4104 RS |
391 | |
392 | [15] 6 3 0x80a9874 0x60874 0x80 .dynamic | |
994a65f3 | 393 | 4 0 0x4 0x8 |
e40c4104 RS |
394 | |
395 | [16] 1 3 0x80a98f4 0x608f4 0x1cf0c .data | |
994a65f3 | 396 | 0 0 0x4 0 |
e40c4104 RS |
397 | |
398 | [17] 8 3 0x80c6800 0x7d800 0 .bss | |
994a65f3 | 399 | 0 0 0x4 0 |
e40c4104 RS |
400 | |
401 | [18] 2 0 0 0x7d800 0x9b90 .symtab | |
994a65f3 | 402 | 19 371 0x4 0x10 |
e40c4104 RS |
403 | |
404 | [19] 3 0 0 0x87390 0x8526 .strtab | |
994a65f3 | 405 | 0 0 0x1 0 |
e40c4104 RS |
406 | |
407 | [20] 3 0 0 0x8f8b6 0x93 .shstrtab | |
994a65f3 | 408 | 0 0 0x1 0 |
e40c4104 RS |
409 | |
410 | [21] 1 0 0 0x8f949 0x68b7 .comment | |
994a65f3 | 411 | 0 0 0x1 0 |
e40c4104 RS |
412 | |
413 | */ | |
414 | \f | |
d427b66a JB |
415 | #include <sys/types.h> |
416 | #include <stdio.h> | |
417 | #include <sys/stat.h> | |
418 | #include <memory.h> | |
419 | #include <string.h> | |
420 | #include <errno.h> | |
421 | #include <unistd.h> | |
422 | #include <fcntl.h> | |
cb1ee811 | 423 | #if !defined (__NetBSD__) && !defined (__OpenBSD__) |
d427b66a | 424 | #include <elf.h> |
e5d0f709 | 425 | #endif |
d427b66a | 426 | #include <sys/mman.h> |
9240b21d RS |
427 | #if defined (__sony_news) && defined (_SYSTYPE_SYSV) |
428 | #include <sys/elf_mips.h> | |
429 | #include <sym.h> | |
72443547 | 430 | #define HAS_SBSS_SECTION |
9240b21d | 431 | #endif /* __sony_news && _SYSTYPE_SYSV */ |
d427b66a | 432 | |
72443547 RS |
433 | #if defined (__NetBSD__) && defined (__powerpc__) |
434 | #define HAS_SBSS_SECTION | |
435 | #endif | |
436 | ||
cb1ee811 | 437 | #if defined (__alpha__) && !defined (__NetBSD__) && !defined (__OpenBSD__) |
eabb24d0 RS |
438 | /* Declare COFF debugging symbol table. This used to be in |
439 | /usr/include/sym.h, but this file is no longer included in Red Hat | |
440 | 5.0 and presumably in any other glibc 2.x based distribution. */ | |
441 | typedef struct { | |
442 | short magic; | |
443 | short vstamp; | |
444 | int ilineMax; | |
445 | int idnMax; | |
446 | int ipdMax; | |
447 | int isymMax; | |
448 | int ioptMax; | |
449 | int iauxMax; | |
450 | int issMax; | |
451 | int issExtMax; | |
452 | int ifdMax; | |
453 | int crfd; | |
454 | int iextMax; | |
455 | long cbLine; | |
456 | long cbLineOffset; | |
457 | long cbDnOffset; | |
458 | long cbPdOffset; | |
459 | long cbSymOffset; | |
460 | long cbOptOffset; | |
461 | long cbAuxOffset; | |
462 | long cbSsOffset; | |
463 | long cbSsExtOffset; | |
464 | long cbFdOffset; | |
465 | long cbRfdOffset; | |
466 | long cbExtOffset; | |
467 | } HDRR, *pHDRR; | |
468 | #define cbHDRR sizeof(HDRR) | |
469 | #define hdrNil ((pHDRR)0) | |
265b2695 RS |
470 | #endif |
471 | ||
e5d0f709 RS |
472 | #ifdef __NetBSD__ |
473 | /* | |
474 | * NetBSD does not have normal-looking user-land ELF support. | |
475 | */ | |
476 | # ifdef __alpha__ | |
477 | # define ELFSIZE 64 | |
478 | # else | |
479 | # define ELFSIZE 32 | |
480 | # endif | |
481 | # include <sys/exec_elf.h> | |
482 | ||
483 | # define PT_LOAD Elf_pt_load | |
484 | # define SHT_SYMTAB Elf_sht_symtab | |
485 | # define SHT_DYNSYM Elf_sht_dynsym | |
486 | # define SHT_NULL Elf_sht_null | |
487 | # define SHT_NOBITS Elf_sht_nobits | |
488 | # define SHT_REL Elf_sht_rel | |
489 | # define SHT_RELA Elf_sht_rela | |
490 | ||
491 | # define SHN_UNDEF Elf_eshn_undefined | |
492 | # define SHN_ABS Elf_eshn_absolute | |
493 | # define SHN_COMMON Elf_eshn_common | |
494 | ||
495 | /* | |
496 | * The magic of picking the right size types is handled by the ELFSIZE | |
497 | * definition above. | |
498 | */ | |
499 | # ifdef __STDC__ | |
500 | # define ElfW(type) Elf_##type | |
501 | # else | |
502 | # define ElfW(type) Elf_/**/type | |
503 | # endif | |
504 | ||
505 | # ifdef __alpha__ | |
506 | # include <sys/exec_ecoff.h> | |
507 | # define HDRR struct ecoff_symhdr | |
508 | # define pHDRR HDRR * | |
509 | # endif | |
510 | #endif /* __NetBSD__ */ | |
511 | ||
cb1ee811 RS |
512 | #ifdef __OpenBSD__ |
513 | # include <sys/exec_elf.h> | |
514 | #endif | |
515 | ||
265b2695 RS |
516 | #if __GNU_LIBRARY__ - 0 >= 6 |
517 | # include <link.h> /* get ElfW etc */ | |
518 | #endif | |
519 | ||
520 | #ifndef ElfW | |
521 | # ifdef __STDC__ | |
522 | # define ElfW(type) Elf32_##type | |
523 | # else | |
524 | # define ElfW(type) Elf32_/**/type | |
525 | # endif | |
526 | #endif | |
527 | ||
d427b66a | 528 | #ifndef emacs |
d7cb42c3 | 529 | #define fatal(a, b, c) fprintf (stderr, a, b, c), exit (1) |
d427b66a | 530 | #else |
82142eb0 | 531 | #include <config.h> |
d7cb42c3 | 532 | extern void fatal (char *, ...); |
d427b66a JB |
533 | #endif |
534 | ||
d8858cfe RS |
535 | #ifndef ELF_BSS_SECTION_NAME |
536 | #define ELF_BSS_SECTION_NAME ".bss" | |
537 | #endif | |
538 | ||
d427b66a JB |
539 | /* Get the address of a particular section or program header entry, |
540 | * accounting for the size of the entries. | |
541 | */ | |
ea083293 RS |
542 | /* |
543 | On PPC Reference Platform running Solaris 2.5.1 | |
544 | the plt section is also of type NOBI like the bss section. | |
545 | (not really stored) and therefore sections after the bss | |
546 | section start at the plt offset. The plt section is always | |
547 | the one just before the bss section. | |
548 | Thus, we modify the test from | |
549 | if (NEW_SECTION_H (nn).sh_offset >= new_data2_offset) | |
550 | to | |
551 | if (NEW_SECTION_H (nn).sh_offset >= | |
552 | OLD_SECTION_H (old_bss_index-1).sh_offset) | |
553 | This is just a hack. We should put the new data section | |
554 | before the .plt section. | |
555 | And we should not have this routine at all but use | |
556 | the libelf library to read the old file and create the new | |
557 | file. | |
558 | The changed code is minimal and depends on prep set in m/prep.h | |
559 | Erik Deumens | |
560 | Quantum Theory Project | |
561 | University of Florida | |
562 | deumens@qtp.ufl.edu | |
563 | Apr 23, 1996 | |
564 | */ | |
d427b66a JB |
565 | |
566 | #define OLD_SECTION_H(n) \ | |
265b2695 | 567 | (*(ElfW(Shdr) *) ((byte *) old_section_h + old_file_h->e_shentsize * (n))) |
d427b66a | 568 | #define NEW_SECTION_H(n) \ |
265b2695 | 569 | (*(ElfW(Shdr) *) ((byte *) new_section_h + new_file_h->e_shentsize * (n))) |
d427b66a | 570 | #define OLD_PROGRAM_H(n) \ |
265b2695 | 571 | (*(ElfW(Phdr) *) ((byte *) old_program_h + old_file_h->e_phentsize * (n))) |
d427b66a | 572 | #define NEW_PROGRAM_H(n) \ |
265b2695 | 573 | (*(ElfW(Phdr) *) ((byte *) new_program_h + new_file_h->e_phentsize * (n))) |
d427b66a | 574 | |
e40c4104 RS |
575 | #define PATCH_INDEX(n) \ |
576 | do { \ | |
d7cb42c3 | 577 | if ((int) (n) >= old_bss_index) \ |
e40c4104 | 578 | (n)++; } while (0) |
d427b66a JB |
579 | typedef unsigned char byte; |
580 | ||
e40c4104 RS |
581 | /* Round X up to a multiple of Y. */ |
582 | ||
4461bfd3 | 583 | ElfW(Addr) |
e40c4104 | 584 | round_up (x, y) |
4461bfd3 | 585 | ElfW(Addr) x, y; |
e40c4104 RS |
586 | { |
587 | int rem = x % y; | |
588 | if (rem == 0) | |
589 | return x; | |
590 | return x - rem + y; | |
591 | } | |
592 | ||
d427b66a JB |
593 | /* **************************************************************** |
594 | * unexec | |
595 | * | |
596 | * driving logic. | |
597 | * | |
598 | * In ELF, this works by replacing the old .bss section with a new | |
599 | * .data section, and inserting an empty .bss immediately afterwards. | |
600 | * | |
601 | */ | |
602 | void | |
603 | unexec (new_name, old_name, data_start, bss_start, entry_address) | |
604 | char *new_name, *old_name; | |
605 | unsigned data_start, bss_start, entry_address; | |
606 | { | |
d427b66a JB |
607 | int new_file, old_file, new_file_size; |
608 | ||
609 | /* Pointers to the base of the image of the two files. */ | |
610 | caddr_t old_base, new_base; | |
611 | ||
612 | /* Pointers to the file, program and section headers for the old and new | |
613 | * files. | |
614 | */ | |
265b2695 RS |
615 | ElfW(Ehdr) *old_file_h, *new_file_h; |
616 | ElfW(Phdr) *old_program_h, *new_program_h; | |
617 | ElfW(Shdr) *old_section_h, *new_section_h; | |
d427b66a JB |
618 | |
619 | /* Point to the section name table in the old file */ | |
620 | char *old_section_names; | |
621 | ||
265b2695 RS |
622 | ElfW(Addr) old_bss_addr, new_bss_addr; |
623 | ElfW(Word) old_bss_size, new_data2_size; | |
624 | ElfW(Off) new_data2_offset; | |
625 | ElfW(Addr) new_data2_addr; | |
d427b66a | 626 | |
d283640e | 627 | int n, nn, old_bss_index, old_data_index, new_data2_index; |
72443547 | 628 | #if defined (HAS_SBSS_SECTION) |
9240b21d | 629 | int old_sbss_index, old_mdebug_index; |
72443547 | 630 | #endif /* HAS_SBSS_SECTION */ |
d427b66a JB |
631 | struct stat stat_buf; |
632 | ||
633 | /* Open the old file & map it into the address space. */ | |
634 | ||
635 | old_file = open (old_name, O_RDONLY); | |
636 | ||
637 | if (old_file < 0) | |
638 | fatal ("Can't open %s for reading: errno %d\n", old_name, errno); | |
639 | ||
640 | if (fstat (old_file, &stat_buf) == -1) | |
d7cb42c3 | 641 | fatal ("Can't fstat (%s): errno %d\n", old_name, errno); |
d427b66a | 642 | |
89b95605 RS |
643 | old_base = mmap ((caddr_t) 0, stat_buf.st_size, PROT_READ, MAP_SHARED, |
644 | old_file, 0); | |
d427b66a JB |
645 | |
646 | if (old_base == (caddr_t) -1) | |
d7cb42c3 | 647 | fatal ("Can't mmap (%s): errno %d\n", old_name, errno); |
d427b66a JB |
648 | |
649 | #ifdef DEBUG | |
d283640e KH |
650 | fprintf (stderr, "mmap (%s, %x) -> %x\n", old_name, stat_buf.st_size, |
651 | old_base); | |
d427b66a JB |
652 | #endif |
653 | ||
654 | /* Get pointers to headers & section names */ | |
655 | ||
265b2695 RS |
656 | old_file_h = (ElfW(Ehdr) *) old_base; |
657 | old_program_h = (ElfW(Phdr) *) ((byte *) old_base + old_file_h->e_phoff); | |
658 | old_section_h = (ElfW(Shdr) *) ((byte *) old_base + old_file_h->e_shoff); | |
d427b66a | 659 | old_section_names = (char *) old_base |
d7cb42c3 | 660 | + OLD_SECTION_H (old_file_h->e_shstrndx).sh_offset; |
d427b66a JB |
661 | |
662 | /* Find the old .bss section. Figure out parameters of the new | |
663 | * data2 and bss sections. | |
664 | */ | |
665 | ||
d7cb42c3 RS |
666 | for (old_bss_index = 1; old_bss_index < (int) old_file_h->e_shnum; |
667 | old_bss_index++) | |
d427b66a JB |
668 | { |
669 | #ifdef DEBUG | |
670 | fprintf (stderr, "Looking for .bss - found %s\n", | |
d7cb42c3 | 671 | old_section_names + OLD_SECTION_H (old_bss_index).sh_name); |
d427b66a | 672 | #endif |
d7cb42c3 | 673 | if (!strcmp (old_section_names + OLD_SECTION_H (old_bss_index).sh_name, |
d8858cfe | 674 | ELF_BSS_SECTION_NAME)) |
d427b66a JB |
675 | break; |
676 | } | |
677 | if (old_bss_index == old_file_h->e_shnum) | |
678 | fatal ("Can't find .bss in %s.\n", old_name, 0); | |
679 | ||
72443547 | 680 | #if defined (HAS_SBSS_SECTION) |
9240b21d RS |
681 | for (old_sbss_index = 1; old_sbss_index < (int) old_file_h->e_shnum; |
682 | old_sbss_index++) | |
683 | { | |
684 | #ifdef DEBUG | |
685 | fprintf (stderr, "Looking for .sbss - found %s\n", | |
686 | old_section_names + OLD_SECTION_H (old_sbss_index).sh_name); | |
687 | #endif | |
688 | if (!strcmp (old_section_names + OLD_SECTION_H (old_sbss_index).sh_name, | |
689 | ".sbss")) | |
690 | break; | |
691 | } | |
692 | if (old_sbss_index == old_file_h->e_shnum) | |
693 | { | |
694 | old_bss_addr = OLD_SECTION_H(old_bss_index).sh_addr; | |
695 | old_bss_size = OLD_SECTION_H(old_bss_index).sh_size; | |
696 | new_data2_offset = OLD_SECTION_H(old_bss_index).sh_offset; | |
697 | new_data2_index = old_bss_index; | |
698 | } | |
699 | else | |
700 | { | |
701 | old_bss_addr = OLD_SECTION_H(old_sbss_index).sh_addr; | |
702 | old_bss_size = OLD_SECTION_H(old_bss_index).sh_size | |
703 | + OLD_SECTION_H(old_sbss_index).sh_size; | |
704 | new_data2_offset = OLD_SECTION_H(old_sbss_index).sh_offset; | |
705 | new_data2_index = old_sbss_index; | |
706 | } | |
707 | ||
708 | for (old_mdebug_index = 1; old_mdebug_index < (int) old_file_h->e_shnum; | |
709 | old_mdebug_index++) | |
710 | { | |
711 | #ifdef DEBUG | |
712 | fprintf (stderr, "Looking for .mdebug - found %s\n", | |
713 | old_section_names + OLD_SECTION_H (old_mdebug_index).sh_name); | |
714 | #endif | |
715 | if (!strcmp (old_section_names + OLD_SECTION_H (old_mdebug_index).sh_name, | |
716 | ".mdebug")) | |
717 | break; | |
718 | } | |
719 | if (old_mdebug_index == old_file_h->e_shnum) | |
720 | old_mdebug_index = 0; | |
72443547 | 721 | #else /* not HAS_SBSS_SECTION */ |
d7cb42c3 RS |
722 | old_bss_addr = OLD_SECTION_H (old_bss_index).sh_addr; |
723 | old_bss_size = OLD_SECTION_H (old_bss_index).sh_size; | |
72443547 | 724 | #endif /* not HAS_SBSS_SECTION */ |
cb1ee811 | 725 | #if defined (emacs) || !defined (DEBUG) |
265b2695 | 726 | new_bss_addr = (ElfW(Addr)) sbrk (0); |
d427b66a JB |
727 | #else |
728 | new_bss_addr = old_bss_addr + old_bss_size + 0x1234; | |
729 | #endif | |
730 | new_data2_addr = old_bss_addr; | |
731 | new_data2_size = new_bss_addr - old_bss_addr; | |
72443547 | 732 | #if !defined (HAS_SBSS_SECTION) |
d7cb42c3 | 733 | new_data2_offset = OLD_SECTION_H (old_bss_index).sh_offset; |
72443547 | 734 | #endif /* not HAS_SBSS_SECTION */ |
d427b66a JB |
735 | |
736 | #ifdef DEBUG | |
737 | fprintf (stderr, "old_bss_index %d\n", old_bss_index); | |
d283640e KH |
738 | fprintf (stderr, "old_bss_addr %x\n", old_bss_addr); |
739 | fprintf (stderr, "old_bss_size %x\n", old_bss_size); | |
740 | fprintf (stderr, "new_bss_addr %x\n", new_bss_addr); | |
741 | fprintf (stderr, "new_data2_addr %x\n", new_data2_addr); | |
742 | fprintf (stderr, "new_data2_size %x\n", new_data2_size); | |
743 | fprintf (stderr, "new_data2_offset %x\n", new_data2_offset); | |
d427b66a JB |
744 | #endif |
745 | ||
d283640e | 746 | if ((unsigned) new_bss_addr < (unsigned) old_bss_addr + old_bss_size) |
d427b66a JB |
747 | fatal (".bss shrank when undumping???\n", 0, 0); |
748 | ||
d7cb42c3 | 749 | /* Set the output file to the right size and mmap it. Set |
d427b66a JB |
750 | * pointers to various interesting objects. stat_buf still has |
751 | * old_file data. | |
752 | */ | |
753 | ||
754 | new_file = open (new_name, O_RDWR | O_CREAT, 0666); | |
755 | if (new_file < 0) | |
d7cb42c3 | 756 | fatal ("Can't creat (%s): errno %d\n", new_name, errno); |
d427b66a JB |
757 | |
758 | new_file_size = stat_buf.st_size + old_file_h->e_shentsize + new_data2_size; | |
759 | ||
760 | if (ftruncate (new_file, new_file_size)) | |
d7cb42c3 | 761 | fatal ("Can't ftruncate (%s): errno %d\n", new_name, errno); |
d427b66a | 762 | |
04f903c0 | 763 | #ifdef UNEXEC_USE_MAP_PRIVATE |
89b95605 RS |
764 | new_base = mmap ((caddr_t) 0, new_file_size, PROT_READ | PROT_WRITE, |
765 | MAP_PRIVATE, new_file, 0); | |
04f903c0 | 766 | #else |
89b95605 RS |
767 | new_base = mmap ((caddr_t) 0, new_file_size, PROT_READ | PROT_WRITE, |
768 | MAP_SHARED, new_file, 0); | |
04f903c0 | 769 | #endif |
d427b66a JB |
770 | |
771 | if (new_base == (caddr_t) -1) | |
d7cb42c3 | 772 | fatal ("Can't mmap (%s): errno %d\n", new_name, errno); |
d427b66a | 773 | |
265b2695 RS |
774 | new_file_h = (ElfW(Ehdr) *) new_base; |
775 | new_program_h = (ElfW(Phdr) *) ((byte *) new_base + old_file_h->e_phoff); | |
776 | new_section_h = (ElfW(Shdr) *) | |
d427b66a JB |
777 | ((byte *) new_base + old_file_h->e_shoff + new_data2_size); |
778 | ||
779 | /* Make our new file, program and section headers as copies of the | |
780 | * originals. | |
781 | */ | |
782 | ||
783 | memcpy (new_file_h, old_file_h, old_file_h->e_ehsize); | |
784 | memcpy (new_program_h, old_program_h, | |
785 | old_file_h->e_phnum * old_file_h->e_phentsize); | |
e40c4104 RS |
786 | |
787 | /* Modify the e_shstrndx if necessary. */ | |
788 | PATCH_INDEX (new_file_h->e_shstrndx); | |
d427b66a JB |
789 | |
790 | /* Fix up file header. We'll add one section. Section header is | |
791 | * further away now. | |
792 | */ | |
793 | ||
794 | new_file_h->e_shoff += new_data2_size; | |
795 | new_file_h->e_shnum += 1; | |
796 | ||
797 | #ifdef DEBUG | |
d283640e | 798 | fprintf (stderr, "Old section offset %x\n", old_file_h->e_shoff); |
d427b66a | 799 | fprintf (stderr, "Old section count %d\n", old_file_h->e_shnum); |
d283640e | 800 | fprintf (stderr, "New section offset %x\n", new_file_h->e_shoff); |
d427b66a JB |
801 | fprintf (stderr, "New section count %d\n", new_file_h->e_shnum); |
802 | #endif | |
803 | ||
804 | /* Fix up a new program header. Extend the writable data segment so | |
805 | * that the bss area is covered too. Find that segment by looking | |
806 | * for a segment that ends just before the .bss area. Make sure | |
807 | * that no segments are above the new .data2. Put a loop at the end | |
808 | * to adjust the offset and address of any segment that is above | |
809 | * data2, just in case we decide to allow this later. | |
810 | */ | |
811 | ||
812 | for (n = new_file_h->e_phnum - 1; n >= 0; n--) | |
813 | { | |
e40c4104 | 814 | /* Compute maximum of all requirements for alignment of section. */ |
d283640e | 815 | int alignment = (NEW_PROGRAM_H (n)).p_align; |
e40c4104 RS |
816 | if ((OLD_SECTION_H (old_bss_index)).sh_addralign > alignment) |
817 | alignment = OLD_SECTION_H (old_bss_index).sh_addralign; | |
818 | ||
72443547 | 819 | #if defined (HAS_SBSS_SECTION) |
9240b21d RS |
820 | if (NEW_PROGRAM_H (n).p_vaddr + NEW_PROGRAM_H (n).p_filesz |
821 | > round_up (old_bss_addr, alignment)) | |
822 | fatal ("Program segment above .bss in %s\n", old_name, 0); | |
72443547 | 823 | #else /* not HAS_SBSS_SECTION */ |
d7cb42c3 | 824 | if (NEW_PROGRAM_H (n).p_vaddr + NEW_PROGRAM_H (n).p_filesz > old_bss_addr) |
d427b66a | 825 | fatal ("Program segment above .bss in %s\n", old_name, 0); |
72443547 | 826 | #endif /* not HAS_SBSS_SECTION */ |
d427b66a | 827 | |
d7cb42c3 | 828 | if (NEW_PROGRAM_H (n).p_type == PT_LOAD |
e40c4104 RS |
829 | && (round_up ((NEW_PROGRAM_H (n)).p_vaddr |
830 | + (NEW_PROGRAM_H (n)).p_filesz, | |
831 | alignment) | |
832 | == round_up (old_bss_addr, alignment))) | |
d427b66a JB |
833 | break; |
834 | } | |
835 | if (n < 0) | |
836 | fatal ("Couldn't find segment next to .bss in %s\n", old_name, 0); | |
837 | ||
c1937d6a AS |
838 | /* Make sure that the size includes any padding before the old .bss |
839 | section. */ | |
840 | NEW_PROGRAM_H (n).p_filesz = new_bss_addr - NEW_PROGRAM_H (n).p_vaddr; | |
d7cb42c3 | 841 | NEW_PROGRAM_H (n).p_memsz = NEW_PROGRAM_H (n).p_filesz; |
d427b66a JB |
842 | |
843 | #if 0 /* Maybe allow section after data2 - does this ever happen? */ | |
844 | for (n = new_file_h->e_phnum - 1; n >= 0; n--) | |
845 | { | |
d7cb42c3 RS |
846 | if (NEW_PROGRAM_H (n).p_vaddr |
847 | && NEW_PROGRAM_H (n).p_vaddr >= new_data2_addr) | |
848 | NEW_PROGRAM_H (n).p_vaddr += new_data2_size - old_bss_size; | |
d427b66a | 849 | |
d7cb42c3 RS |
850 | if (NEW_PROGRAM_H (n).p_offset >= new_data2_offset) |
851 | NEW_PROGRAM_H (n).p_offset += new_data2_size; | |
d427b66a JB |
852 | } |
853 | #endif | |
854 | ||
855 | /* Fix up section headers based on new .data2 section. Any section | |
856 | * whose offset or virtual address is after the new .data2 section | |
857 | * gets its value adjusted. .bss size becomes zero and new address | |
858 | * is set. data2 section header gets added by copying the existing | |
859 | * .data header and modifying the offset, address and size. | |
860 | */ | |
d7cb42c3 | 861 | for (old_data_index = 1; old_data_index < (int) old_file_h->e_shnum; |
d427b66a | 862 | old_data_index++) |
d7cb42c3 | 863 | if (!strcmp (old_section_names + OLD_SECTION_H (old_data_index).sh_name, |
d427b66a JB |
864 | ".data")) |
865 | break; | |
866 | if (old_data_index == old_file_h->e_shnum) | |
867 | fatal ("Can't find .data in %s.\n", old_name, 0); | |
868 | ||
994a65f3 | 869 | /* Walk through all section headers, insert the new data2 section right |
e40c4104 | 870 | before the new bss section. */ |
d7cb42c3 | 871 | for (n = 1, nn = 1; n < (int) old_file_h->e_shnum; n++, nn++) |
d427b66a JB |
872 | { |
873 | caddr_t src; | |
9240b21d | 874 | int temp_index; |
72443547 | 875 | #if defined (HAS_SBSS_SECTION) |
9240b21d RS |
876 | /* If it is (s)bss section, insert the new data2 section before it. */ |
877 | /* new_data2_index is the index of either old_sbss or old_bss, that was | |
878 | chosen as a section for new_data2. */ | |
879 | temp_index = new_data2_index; | |
72443547 | 880 | #else /* not HAS_SBSS_SECTION */ |
9240b21d RS |
881 | /* If it is bss section, insert the new data2 section before it. */ |
882 | temp_index = old_bss_index; | |
72443547 | 883 | #endif /* not HAS_SBSS_SECTION */ |
9240b21d | 884 | if (n == temp_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 | |
72443547 | 909 | #if defined (HAS_SBSS_SECTION) |
9240b21d RS |
910 | /* The new bss and sbss section's size is zero, and its file offset |
911 | and virtual address should be off by NEW_DATA2_SIZE. */ | |
912 | || n == old_sbss_index | |
72443547 | 913 | #endif /* HAS_SBSS_SECTION */ |
9240b21d | 914 | ) |
e40c4104 RS |
915 | { |
916 | /* NN should be `old_bss_index + 1' at this point. */ | |
d7cb42c3 RS |
917 | NEW_SECTION_H (nn).sh_offset += new_data2_size; |
918 | NEW_SECTION_H (nn).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 | |
faee8ef0 RS |
942 | if (round_up (NEW_SECTION_H (nn).sh_offset, |
943 | OLD_SECTION_H (old_bss_index).sh_addralign) | |
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); | |
964 | ||
965 | /* Now, start to copy the content of sections. */ | |
d7cb42c3 RS |
966 | if (NEW_SECTION_H (nn).sh_type == SHT_NULL |
967 | || NEW_SECTION_H (nn).sh_type == SHT_NOBITS) | |
d427b66a | 968 | continue; |
994a65f3 | 969 | |
e40c4104 | 970 | /* Write out the sections. .data and .data1 (and data2, called |
8917361f RS |
971 | ".data" in the strings table) get copied from the current process |
972 | instead of the old file. */ | |
d7cb42c3 | 973 | if (!strcmp (old_section_names + NEW_SECTION_H (n).sh_name, ".data") |
9240b21d RS |
974 | #ifdef _nec_ews_svr4 /* hir, 1994.6.13 */ |
975 | || !strcmp ((old_section_names + NEW_SECTION_H(n).sh_name), | |
976 | ".sdata") | |
977 | #endif | |
72443547 | 978 | #if defined (HAS_SBSS_SECTION) |
9240b21d RS |
979 | || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name), |
980 | ".sdata") | |
981 | || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name), | |
982 | ".lit4") | |
983 | || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name), | |
984 | ".lit8") | |
72443547 | 985 | #endif /* HAS_SBSS_SECTION */ |
d7cb42c3 | 986 | || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name), |
d427b66a | 987 | ".data1")) |
d7cb42c3 | 988 | src = (caddr_t) OLD_SECTION_H (n).sh_addr; |
d427b66a | 989 | else |
d7cb42c3 | 990 | src = old_base + OLD_SECTION_H (n).sh_offset; |
994a65f3 | 991 | |
d7cb42c3 RS |
992 | memcpy (NEW_SECTION_H (nn).sh_offset + new_base, src, |
993 | NEW_SECTION_H (nn).sh_size); | |
e40c4104 | 994 | |
265b2695 RS |
995 | #ifdef __alpha__ |
996 | /* Update Alpha COFF symbol table: */ | |
997 | if (strcmp (old_section_names + OLD_SECTION_H (n).sh_name, ".mdebug") | |
998 | == 0) | |
999 | { | |
1000 | pHDRR symhdr = (pHDRR) (NEW_SECTION_H (nn).sh_offset + new_base); | |
1001 | ||
1002 | symhdr->cbLineOffset += new_data2_size; | |
1003 | symhdr->cbDnOffset += new_data2_size; | |
1004 | symhdr->cbPdOffset += new_data2_size; | |
1005 | symhdr->cbSymOffset += new_data2_size; | |
1006 | symhdr->cbOptOffset += new_data2_size; | |
1007 | symhdr->cbAuxOffset += new_data2_size; | |
1008 | symhdr->cbSsOffset += new_data2_size; | |
1009 | symhdr->cbSsExtOffset += new_data2_size; | |
1010 | symhdr->cbFdOffset += new_data2_size; | |
1011 | symhdr->cbRfdOffset += new_data2_size; | |
1012 | symhdr->cbExtOffset += new_data2_size; | |
1013 | } | |
1014 | #endif /* __alpha__ */ | |
1015 | ||
9240b21d RS |
1016 | #if defined (__sony_news) && defined (_SYSTYPE_SYSV) |
1017 | if (NEW_SECTION_H (nn).sh_type == SHT_MIPS_DEBUG && old_mdebug_index) | |
1018 | { | |
1019 | int diff = NEW_SECTION_H(nn).sh_offset | |
1020 | - OLD_SECTION_H(old_mdebug_index).sh_offset; | |
1021 | HDRR *phdr = (HDRR *)(NEW_SECTION_H (nn).sh_offset + new_base); | |
1022 | ||
1023 | if (diff) | |
1024 | { | |
1025 | phdr->cbLineOffset += diff; | |
1026 | phdr->cbDnOffset += diff; | |
1027 | phdr->cbPdOffset += diff; | |
1028 | phdr->cbSymOffset += diff; | |
1029 | phdr->cbOptOffset += diff; | |
1030 | phdr->cbAuxOffset += diff; | |
1031 | phdr->cbSsOffset += diff; | |
1032 | phdr->cbSsExtOffset += diff; | |
1033 | phdr->cbFdOffset += diff; | |
1034 | phdr->cbRfdOffset += diff; | |
1035 | phdr->cbExtOffset += diff; | |
1036 | } | |
1037 | } | |
1038 | #endif /* __sony_news && _SYSTYPE_SYSV */ | |
8917361f | 1039 | /* If it is the symbol table, its st_shndx field needs to be patched. */ |
d7cb42c3 RS |
1040 | if (NEW_SECTION_H (nn).sh_type == SHT_SYMTAB |
1041 | || NEW_SECTION_H (nn).sh_type == SHT_DYNSYM) | |
e40c4104 | 1042 | { |
265b2695 | 1043 | ElfW(Shdr) *spt = &NEW_SECTION_H (nn); |
e40c4104 | 1044 | unsigned int num = spt->sh_size / spt->sh_entsize; |
265b2695 | 1045 | ElfW(Sym) * sym = (ElfW(Sym) *) (NEW_SECTION_H (nn).sh_offset + |
e40c4104 RS |
1046 | new_base); |
1047 | for (; num--; sym++) | |
1048 | { | |
1049 | if ((sym->st_shndx == SHN_UNDEF) | |
1050 | || (sym->st_shndx == SHN_ABS) | |
1051 | || (sym->st_shndx == SHN_COMMON)) | |
1052 | continue; | |
994a65f3 | 1053 | |
d7cb42c3 | 1054 | PATCH_INDEX (sym->st_shndx); |
e40c4104 RS |
1055 | } |
1056 | } | |
d427b66a JB |
1057 | } |
1058 | ||
8917361f | 1059 | /* Update the symbol values of _edata and _end. */ |
8bf761ce RS |
1060 | for (n = new_file_h->e_shnum - 1; n; n--) |
1061 | { | |
1062 | byte *symnames; | |
265b2695 | 1063 | ElfW(Sym) *symp, *symendp; |
8bf761ce RS |
1064 | |
1065 | if (NEW_SECTION_H (n).sh_type != SHT_DYNSYM | |
1066 | && NEW_SECTION_H (n).sh_type != SHT_SYMTAB) | |
1067 | continue; | |
1068 | ||
8c1e9afe KH |
1069 | symnames = ((byte *) new_base |
1070 | + NEW_SECTION_H (NEW_SECTION_H (n).sh_link).sh_offset); | |
265b2695 RS |
1071 | symp = (ElfW(Sym) *) (NEW_SECTION_H (n).sh_offset + new_base); |
1072 | symendp = (ElfW(Sym) *) ((byte *)symp + NEW_SECTION_H (n).sh_size); | |
8bf761ce RS |
1073 | |
1074 | for (; symp < symendp; symp ++) | |
1075 | if (strcmp ((char *) (symnames + symp->st_name), "_end") == 0 | |
2e1ddb87 RS |
1076 | || strcmp ((char *) (symnames + symp->st_name), "end") == 0 |
1077 | || strcmp ((char *) (symnames + symp->st_name), "_edata") == 0 | |
1078 | || strcmp ((char *) (symnames + symp->st_name), "edata") == 0) | |
8bf761ce RS |
1079 | memcpy (&symp->st_value, &new_bss_addr, sizeof (new_bss_addr)); |
1080 | } | |
1081 | ||
48240339 KH |
1082 | /* This loop seeks out relocation sections for the data section, so |
1083 | that it can undo relocations performed by the runtime linker. */ | |
1084 | for (n = new_file_h->e_shnum - 1; n; n--) | |
1085 | { | |
265b2695 | 1086 | ElfW(Shdr) section = NEW_SECTION_H (n); |
48240339 KH |
1087 | switch (section.sh_type) { |
1088 | default: | |
1089 | break; | |
1090 | case SHT_REL: | |
1091 | case SHT_RELA: | |
994a65f3 RM |
1092 | /* This code handles two different size structs, but there should |
1093 | be no harm in that provided that r_offset is always the first | |
1094 | member. */ | |
48240339 KH |
1095 | nn = section.sh_info; |
1096 | if (!strcmp (old_section_names + NEW_SECTION_H (nn).sh_name, ".data") | |
1097 | || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name), | |
1098 | ".data1")) | |
1099 | { | |
265b2695 | 1100 | ElfW(Addr) offset = NEW_SECTION_H (nn).sh_addr - |
48240339 KH |
1101 | NEW_SECTION_H (nn).sh_offset; |
1102 | caddr_t reloc = old_base + section.sh_offset, end; | |
1103 | for (end = reloc + section.sh_size; reloc < end; | |
1104 | reloc += section.sh_entsize) | |
1105 | { | |
265b2695 RS |
1106 | ElfW(Addr) addr = ((ElfW(Rel) *) reloc)->r_offset - offset; |
1107 | #ifdef __alpha__ | |
1108 | /* The Alpha ELF binutils currently have a bug that | |
1109 | sometimes results in relocs that contain all | |
1110 | zeroes. Work around this for now... */ | |
1111 | if (((ElfW(Rel) *) reloc)->r_offset == 0) | |
1112 | continue; | |
1113 | #endif | |
1114 | memcpy (new_base + addr, old_base + addr, sizeof(ElfW(Addr))); | |
48240339 KH |
1115 | } |
1116 | } | |
1117 | break; | |
1118 | } | |
1119 | } | |
48240339 | 1120 | |
04f903c0 KH |
1121 | #ifdef UNEXEC_USE_MAP_PRIVATE |
1122 | if (lseek (new_file, 0, SEEK_SET) == -1) | |
1123 | fatal ("Can't rewind (%s): errno %d\n", new_name, errno); | |
1124 | ||
1125 | if (write (new_file, new_base, new_file_size) != new_file_size) | |
1126 | fatal ("Can't write (%s): errno %d\n", new_name, errno); | |
1127 | #endif | |
1128 | ||
8917361f | 1129 | /* Close the files and make the new file executable. */ |
d427b66a JB |
1130 | |
1131 | if (close (old_file)) | |
d7cb42c3 | 1132 | fatal ("Can't close (%s): errno %d\n", old_name, errno); |
d427b66a JB |
1133 | |
1134 | if (close (new_file)) | |
d7cb42c3 | 1135 | fatal ("Can't close (%s): errno %d\n", new_name, errno); |
d427b66a JB |
1136 | |
1137 | if (stat (new_name, &stat_buf) == -1) | |
d7cb42c3 | 1138 | fatal ("Can't stat (%s): errno %d\n", new_name, errno); |
d427b66a JB |
1139 | |
1140 | n = umask (777); | |
1141 | umask (n); | |
1142 | stat_buf.st_mode |= 0111 & ~n; | |
1143 | if (chmod (new_name, stat_buf.st_mode) == -1) | |
d7cb42c3 | 1144 | fatal ("Can't chmod (%s): errno %d\n", new_name, errno); |
d427b66a | 1145 | } |