Commit | Line | Data |
---|---|---|
ba318903 | 1 | /* Copyright (C) 1985-1988, 1990, 1992, 1999-2014 Free Software |
ab422c4d | 2 | Foundation, Inc. |
d427b66a | 3 | |
3b7ad313 | 4 | This file is part of GNU Emacs. |
e40c4104 | 5 | |
9ec0b715 | 6 | GNU Emacs is free software: you can redistribute it and/or modify |
3b7ad313 | 7 | it under the terms of the GNU General Public License as published by |
9ec0b715 GM |
8 | the Free Software Foundation, either version 3 of the License, or |
9 | (at your option) 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 | |
9ec0b715 | 17 | along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */ |
d427b66a | 18 | |
9ec0b715 | 19 | /* |
d427b66a JB |
20 | In other words, you are welcome to use, share and improve this program. |
21 | You are forbidden to forbid anyone else to use, share and improve | |
22 | what you give them. Help stamp out software-hoarding! */ | |
23 | ||
24 | ||
25 | /* | |
26 | * unexec.c - Convert a running program into an a.out file. | |
27 | * | |
28 | * Author: Spencer W. Thomas | |
826ba17e AS |
29 | * Computer Science Dept. |
30 | * University of Utah | |
d427b66a JB |
31 | * Date: Tue Mar 2 1982 |
32 | * Modified heavily since then. | |
33 | * | |
34 | * Synopsis: | |
dd5ecd6b | 35 | * unexec (const char *new_name, const char *old_name); |
d427b66a JB |
36 | * |
37 | * Takes a snapshot of the program and makes an a.out format file in the | |
38 | * file named by the string argument new_name. | |
89b95605 RS |
39 | * If old_name is non-NULL, the symbol table will be taken from the given file. |
40 | * On some machines, an existing old_name file is required. | |
d427b66a | 41 | * |
d427b66a JB |
42 | */ |
43 | ||
44 | /* Even more heavily modified by james@bigtex.cactus.org of Dell Computer Co. | |
45 | * ELF support added. | |
46 | * | |
47 | * Basic theory: the data space of the running process needs to be | |
48 | * dumped to the output file. Normally we would just enlarge the size | |
49 | * of .data, scooting everything down. But we can't do that in ELF, | |
50 | * because there is often something between the .data space and the | |
51 | * .bss space. | |
52 | * | |
53 | * In the temacs dump below, notice that the Global Offset Table | |
54 | * (.got) and the Dynamic link data (.dynamic) come between .data1 and | |
55 | * .bss. It does not work to overlap .data with these fields. | |
56 | * | |
57 | * The solution is to create a new .data segment. This segment is | |
58 | * filled with data from the current process. Since the contents of | |
59 | * various sections refer to sections by index, the new .data segment | |
60 | * is made the last in the table to avoid changing any existing index. | |
61 | ||
62 | * This is an example of how the section headers are changed. "Addr" | |
63 | * is a process virtual address. "Offset" is a file offset. | |
64 | ||
65 | raid:/nfs/raid/src/dist-18.56/src> dump -h temacs | |
66 | ||
67 | temacs: | |
68 | ||
69 | **** SECTION HEADER TABLE **** | |
7da3d06f DL |
70 | [No] Type Flags Addr Offset Size Name |
71 | Link Info Adralgn Entsize | |
d427b66a | 72 | |
7da3d06f DL |
73 | [1] 1 2 0x80480d4 0xd4 0x13 .interp |
74 | 0 0 0x1 0 | |
d427b66a | 75 | |
7da3d06f DL |
76 | [2] 5 2 0x80480e8 0xe8 0x388 .hash |
77 | 3 0 0x4 0x4 | |
d427b66a | 78 | |
7da3d06f DL |
79 | [3] 11 2 0x8048470 0x470 0x7f0 .dynsym |
80 | 4 1 0x4 0x10 | |
d427b66a | 81 | |
7da3d06f DL |
82 | [4] 3 2 0x8048c60 0xc60 0x3ad .dynstr |
83 | 0 0 0x1 0 | |
d427b66a | 84 | |
7da3d06f DL |
85 | [5] 9 2 0x8049010 0x1010 0x338 .rel.plt |
86 | 3 7 0x4 0x8 | |
d427b66a | 87 | |
7da3d06f DL |
88 | [6] 1 6 0x8049348 0x1348 0x3 .init |
89 | 0 0 0x4 0 | |
d427b66a | 90 | |
7da3d06f DL |
91 | [7] 1 6 0x804934c 0x134c 0x680 .plt |
92 | 0 0 0x4 0x4 | |
d427b66a | 93 | |
7da3d06f DL |
94 | [8] 1 6 0x80499cc 0x19cc 0x3c56f .text |
95 | 0 0 0x4 0 | |
d427b66a | 96 | |
7da3d06f DL |
97 | [9] 1 6 0x8085f3c 0x3df3c 0x3 .fini |
98 | 0 0 0x4 0 | |
d427b66a | 99 | |
7da3d06f DL |
100 | [10] 1 2 0x8085f40 0x3df40 0x69c .rodata |
101 | 0 0 0x4 0 | |
d427b66a | 102 | |
7da3d06f DL |
103 | [11] 1 2 0x80865dc 0x3e5dc 0xd51 .rodata1 |
104 | 0 0 0x4 0 | |
d427b66a | 105 | |
7da3d06f DL |
106 | [12] 1 3 0x8088330 0x3f330 0x20afc .data |
107 | 0 0 0x4 0 | |
d427b66a | 108 | |
7da3d06f DL |
109 | [13] 1 3 0x80a8e2c 0x5fe2c 0x89d .data1 |
110 | 0 0 0x4 0 | |
d427b66a | 111 | |
7da3d06f DL |
112 | [14] 1 3 0x80a96cc 0x606cc 0x1a8 .got |
113 | 0 0 0x4 0x4 | |
d427b66a | 114 | |
7da3d06f DL |
115 | [15] 6 3 0x80a9874 0x60874 0x80 .dynamic |
116 | 4 0 0x4 0x8 | |
d427b66a | 117 | |
7da3d06f DL |
118 | [16] 8 3 0x80a98f4 0x608f4 0x449c .bss |
119 | 0 0 0x4 0 | |
d427b66a | 120 | |
7da3d06f DL |
121 | [17] 2 0 0 0x608f4 0x9b90 .symtab |
122 | 18 371 0x4 0x10 | |
d427b66a | 123 | |
7da3d06f DL |
124 | [18] 3 0 0 0x6a484 0x8526 .strtab |
125 | 0 0 0x1 0 | |
d427b66a | 126 | |
7da3d06f DL |
127 | [19] 3 0 0 0x729aa 0x93 .shstrtab |
128 | 0 0 0x1 0 | |
d427b66a | 129 | |
7da3d06f DL |
130 | [20] 1 0 0 0x72a3d 0x68b7 .comment |
131 | 0 0 0x1 0 | |
d427b66a | 132 | |
7da3d06f | 133 | raid:/nfs/raid/src/dist-18.56/src> dump -h xemacs |
d427b66a | 134 | |
7da3d06f | 135 | xemacs: |
d427b66a | 136 | |
7da3d06f DL |
137 | **** SECTION HEADER TABLE **** |
138 | [No] Type Flags Addr Offset Size Name | |
139 | Link Info Adralgn Entsize | |
d427b66a | 140 | |
7da3d06f DL |
141 | [1] 1 2 0x80480d4 0xd4 0x13 .interp |
142 | 0 0 0x1 0 | |
d427b66a | 143 | |
7da3d06f DL |
144 | [2] 5 2 0x80480e8 0xe8 0x388 .hash |
145 | 3 0 0x4 0x4 | |
d427b66a | 146 | |
7da3d06f DL |
147 | [3] 11 2 0x8048470 0x470 0x7f0 .dynsym |
148 | 4 1 0x4 0x10 | |
d427b66a | 149 | |
7da3d06f DL |
150 | [4] 3 2 0x8048c60 0xc60 0x3ad .dynstr |
151 | 0 0 0x1 0 | |
d427b66a | 152 | |
7da3d06f DL |
153 | [5] 9 2 0x8049010 0x1010 0x338 .rel.plt |
154 | 3 7 0x4 0x8 | |
d427b66a | 155 | |
7da3d06f DL |
156 | [6] 1 6 0x8049348 0x1348 0x3 .init |
157 | 0 0 0x4 0 | |
d427b66a | 158 | |
7da3d06f DL |
159 | [7] 1 6 0x804934c 0x134c 0x680 .plt |
160 | 0 0 0x4 0x4 | |
d427b66a | 161 | |
7da3d06f DL |
162 | [8] 1 6 0x80499cc 0x19cc 0x3c56f .text |
163 | 0 0 0x4 0 | |
d427b66a | 164 | |
7da3d06f DL |
165 | [9] 1 6 0x8085f3c 0x3df3c 0x3 .fini |
166 | 0 0 0x4 0 | |
d427b66a | 167 | |
7da3d06f DL |
168 | [10] 1 2 0x8085f40 0x3df40 0x69c .rodata |
169 | 0 0 0x4 0 | |
d427b66a | 170 | |
7da3d06f DL |
171 | [11] 1 2 0x80865dc 0x3e5dc 0xd51 .rodata1 |
172 | 0 0 0x4 0 | |
d427b66a | 173 | |
7da3d06f DL |
174 | [12] 1 3 0x8088330 0x3f330 0x20afc .data |
175 | 0 0 0x4 0 | |
d427b66a | 176 | |
7da3d06f DL |
177 | [13] 1 3 0x80a8e2c 0x5fe2c 0x89d .data1 |
178 | 0 0 0x4 0 | |
d427b66a | 179 | |
7da3d06f DL |
180 | [14] 1 3 0x80a96cc 0x606cc 0x1a8 .got |
181 | 0 0 0x4 0x4 | |
d427b66a | 182 | |
7da3d06f DL |
183 | [15] 6 3 0x80a9874 0x60874 0x80 .dynamic |
184 | 4 0 0x4 0x8 | |
d427b66a | 185 | |
7da3d06f DL |
186 | [16] 8 3 0x80c6800 0x7d800 0 .bss |
187 | 0 0 0x4 0 | |
d427b66a | 188 | |
7da3d06f DL |
189 | [17] 2 0 0 0x7d800 0x9b90 .symtab |
190 | 18 371 0x4 0x10 | |
d427b66a | 191 | |
7da3d06f DL |
192 | [18] 3 0 0 0x87390 0x8526 .strtab |
193 | 0 0 0x1 0 | |
d427b66a | 194 | |
7da3d06f DL |
195 | [19] 3 0 0 0x8f8b6 0x93 .shstrtab |
196 | 0 0 0x1 0 | |
d427b66a | 197 | |
7da3d06f DL |
198 | [20] 1 0 0 0x8f949 0x68b7 .comment |
199 | 0 0 0x1 0 | |
d427b66a | 200 | |
7da3d06f DL |
201 | [21] 1 3 0x80a98f4 0x608f4 0x1cf0c .data |
202 | 0 0 0x4 0 | |
d427b66a | 203 | |
7da3d06f DL |
204 | * This is an example of how the file header is changed. "Shoff" is |
205 | * the section header offset within the file. Since that table is | |
206 | * after the new .data section, it is moved. "Shnum" is the number of | |
207 | * sections, which we increment. | |
208 | * | |
209 | * "Phoff" is the file offset to the program header. "Phentsize" and | |
210 | * "Shentsz" are the program and section header entries sizes respectively. | |
211 | * These can be larger than the apparent struct sizes. | |
d427b66a | 212 | |
7da3d06f | 213 | raid:/nfs/raid/src/dist-18.56/src> dump -f temacs |
d427b66a | 214 | |
7da3d06f | 215 | temacs: |
d427b66a | 216 | |
7da3d06f DL |
217 | **** ELF HEADER **** |
218 | Class Data Type Machine Version | |
219 | Entry Phoff Shoff Flags Ehsize | |
220 | Phentsize Phnum Shentsz Shnum Shstrndx | |
d427b66a | 221 | |
7da3d06f DL |
222 | 1 1 2 3 1 |
223 | 0x80499cc 0x34 0x792f4 0 0x34 | |
224 | 0x20 5 0x28 21 19 | |
d427b66a | 225 | |
7da3d06f | 226 | raid:/nfs/raid/src/dist-18.56/src> dump -f xemacs |
d427b66a | 227 | |
7da3d06f | 228 | xemacs: |
d427b66a | 229 | |
7da3d06f DL |
230 | **** ELF HEADER **** |
231 | Class Data Type Machine Version | |
232 | Entry Phoff Shoff Flags Ehsize | |
233 | Phentsize Phnum Shentsz Shnum Shstrndx | |
d427b66a | 234 | |
7da3d06f DL |
235 | 1 1 2 3 1 |
236 | 0x80499cc 0x34 0x96200 0 0x34 | |
237 | 0x20 5 0x28 22 19 | |
d427b66a | 238 | |
7da3d06f DL |
239 | * These are the program headers. "Offset" is the file offset to the |
240 | * segment. "Vaddr" is the memory load address. "Filesz" is the | |
241 | * segment size as it appears in the file, and "Memsz" is the size in | |
242 | * memory. Below, the third segment is the code and the fourth is the | |
243 | * data: the difference between Filesz and Memsz is .bss | |
d427b66a | 244 | |
7da3d06f | 245 | raid:/nfs/raid/src/dist-18.56/src> dump -o temacs |
d427b66a | 246 | |
7da3d06f DL |
247 | temacs: |
248 | ***** PROGRAM EXECUTION HEADER ***** | |
249 | Type Offset Vaddr Paddr | |
250 | Filesz Memsz Flags Align | |
d427b66a | 251 | |
7da3d06f DL |
252 | 6 0x34 0x8048034 0 |
253 | 0xa0 0xa0 5 0 | |
d427b66a | 254 | |
7da3d06f DL |
255 | 3 0xd4 0 0 |
256 | 0x13 0 4 0 | |
d427b66a | 257 | |
7da3d06f DL |
258 | 1 0x34 0x8048034 0 |
259 | 0x3f2f9 0x3f2f9 5 0x1000 | |
d427b66a | 260 | |
7da3d06f DL |
261 | 1 0x3f330 0x8088330 0 |
262 | 0x215c4 0x25a60 7 0x1000 | |
d427b66a | 263 | |
7da3d06f DL |
264 | 2 0x60874 0x80a9874 0 |
265 | 0x80 0 7 0 | |
d427b66a | 266 | |
7da3d06f | 267 | raid:/nfs/raid/src/dist-18.56/src> dump -o xemacs |
d427b66a | 268 | |
7da3d06f DL |
269 | xemacs: |
270 | ***** PROGRAM EXECUTION HEADER ***** | |
271 | Type Offset Vaddr Paddr | |
272 | Filesz Memsz Flags Align | |
d427b66a | 273 | |
7da3d06f DL |
274 | 6 0x34 0x8048034 0 |
275 | 0xa0 0xa0 5 0 | |
d427b66a | 276 | |
7da3d06f DL |
277 | 3 0xd4 0 0 |
278 | 0x13 0 4 0 | |
d427b66a | 279 | |
7da3d06f DL |
280 | 1 0x34 0x8048034 0 |
281 | 0x3f2f9 0x3f2f9 5 0x1000 | |
d427b66a | 282 | |
7da3d06f DL |
283 | 1 0x3f330 0x8088330 0 |
284 | 0x3e4d0 0x3e4d0 7 0x1000 | |
d427b66a | 285 | |
7da3d06f DL |
286 | 2 0x60874 0x80a9874 0 |
287 | 0x80 0 7 0 | |
d427b66a JB |
288 | |
289 | ||
290 | */ | |
e40c4104 | 291 | \f |
994a65f3 RM |
292 | /* Modified by wtien@urbana.mcd.mot.com of Motorola Inc. |
293 | * | |
e40c4104 | 294 | * The above mechanism does not work if the unexeced ELF file is being |
994a65f3 | 295 | * re-layout by other applications (such as `strip'). All the applications |
e40c4104 | 296 | * that re-layout the internal of ELF will layout all sections in ascending |
994a65f3 RM |
297 | * order of their file offsets. After the re-layout, the data2 section will |
298 | * still be the LAST section in the section header vector, but its file offset | |
e40c4104 | 299 | * is now being pushed far away down, and causes part of it not to be mapped |
994a65f3 | 300 | * in (ie. not covered by the load segment entry in PHDR vector), therefore |
e40c4104 RS |
301 | * causes the new binary to fail. |
302 | * | |
303 | * The solution is to modify the unexec algorithm to insert the new data2 | |
304 | * section header right before the new bss section header, so their file | |
994a65f3 RM |
305 | * offsets will be in the ascending order. Since some of the section's (all |
306 | * sections AFTER the bss section) indexes are now changed, we also need to | |
307 | * modify some fields to make them point to the right sections. This is done | |
e40c4104 | 308 | * by macro PATCH_INDEX. All the fields that need to be patched are: |
994a65f3 | 309 | * |
e40c4104 RS |
310 | * 1. ELF header e_shstrndx field. |
311 | * 2. section header sh_link and sh_info field. | |
312 | * 3. symbol table entry st_shndx field. | |
313 | * | |
314 | * The above example now should look like: | |
315 | ||
316 | **** SECTION HEADER TABLE **** | |
7da3d06f DL |
317 | [No] Type Flags Addr Offset Size Name |
318 | Link Info Adralgn Entsize | |
e40c4104 | 319 | |
7da3d06f DL |
320 | [1] 1 2 0x80480d4 0xd4 0x13 .interp |
321 | 0 0 0x1 0 | |
d427b66a | 322 | |
7da3d06f DL |
323 | [2] 5 2 0x80480e8 0xe8 0x388 .hash |
324 | 3 0 0x4 0x4 | |
e40c4104 | 325 | |
7da3d06f DL |
326 | [3] 11 2 0x8048470 0x470 0x7f0 .dynsym |
327 | 4 1 0x4 0x10 | |
e40c4104 | 328 | |
7da3d06f DL |
329 | [4] 3 2 0x8048c60 0xc60 0x3ad .dynstr |
330 | 0 0 0x1 0 | |
e40c4104 | 331 | |
7da3d06f DL |
332 | [5] 9 2 0x8049010 0x1010 0x338 .rel.plt |
333 | 3 7 0x4 0x8 | |
e40c4104 | 334 | |
7da3d06f DL |
335 | [6] 1 6 0x8049348 0x1348 0x3 .init |
336 | 0 0 0x4 0 | |
e40c4104 | 337 | |
7da3d06f DL |
338 | [7] 1 6 0x804934c 0x134c 0x680 .plt |
339 | 0 0 0x4 0x4 | |
e40c4104 | 340 | |
7da3d06f DL |
341 | [8] 1 6 0x80499cc 0x19cc 0x3c56f .text |
342 | 0 0 0x4 0 | |
e40c4104 | 343 | |
7da3d06f DL |
344 | [9] 1 6 0x8085f3c 0x3df3c 0x3 .fini |
345 | 0 0 0x4 0 | |
e40c4104 | 346 | |
7da3d06f DL |
347 | [10] 1 2 0x8085f40 0x3df40 0x69c .rodata |
348 | 0 0 0x4 0 | |
e40c4104 | 349 | |
7da3d06f DL |
350 | [11] 1 2 0x80865dc 0x3e5dc 0xd51 .rodata1 |
351 | 0 0 0x4 0 | |
e40c4104 | 352 | |
7da3d06f DL |
353 | [12] 1 3 0x8088330 0x3f330 0x20afc .data |
354 | 0 0 0x4 0 | |
e40c4104 | 355 | |
7da3d06f DL |
356 | [13] 1 3 0x80a8e2c 0x5fe2c 0x89d .data1 |
357 | 0 0 0x4 0 | |
e40c4104 | 358 | |
7da3d06f DL |
359 | [14] 1 3 0x80a96cc 0x606cc 0x1a8 .got |
360 | 0 0 0x4 0x4 | |
e40c4104 | 361 | |
7da3d06f DL |
362 | [15] 6 3 0x80a9874 0x60874 0x80 .dynamic |
363 | 4 0 0x4 0x8 | |
e40c4104 | 364 | |
7da3d06f DL |
365 | [16] 1 3 0x80a98f4 0x608f4 0x1cf0c .data |
366 | 0 0 0x4 0 | |
e40c4104 | 367 | |
7da3d06f DL |
368 | [17] 8 3 0x80c6800 0x7d800 0 .bss |
369 | 0 0 0x4 0 | |
e40c4104 | 370 | |
7da3d06f DL |
371 | [18] 2 0 0 0x7d800 0x9b90 .symtab |
372 | 19 371 0x4 0x10 | |
e40c4104 | 373 | |
7da3d06f DL |
374 | [19] 3 0 0 0x87390 0x8526 .strtab |
375 | 0 0 0x1 0 | |
e40c4104 | 376 | |
7da3d06f DL |
377 | [20] 3 0 0 0x8f8b6 0x93 .shstrtab |
378 | 0 0 0x1 0 | |
e40c4104 | 379 | |
7da3d06f DL |
380 | [21] 1 0 0 0x8f949 0x68b7 .comment |
381 | 0 0 0x1 0 | |
e40c4104 RS |
382 | |
383 | */ | |
384 | \f | |
d9d54213 RS |
385 | /* We do not use mmap because that fails with NFS. |
386 | Instead we read the whole file, modify it, and write it out. */ | |
387 | ||
1b963cdd | 388 | #include <config.h> |
406af475 PE |
389 | #include "unexec.h" |
390 | #include "lisp.h" | |
1b963cdd | 391 | |
5ee94506 PE |
392 | #include <errno.h> |
393 | #include <fcntl.h> | |
394 | #include <limits.h> | |
395 | #include <memory.h> | |
ee2079f1 | 396 | #include <stdint.h> |
d427b66a JB |
397 | #include <stdio.h> |
398 | #include <sys/stat.h> | |
5ee94506 | 399 | #include <sys/types.h> |
d427b66a | 400 | #include <unistd.h> |
5ee94506 | 401 | |
cb1ee811 | 402 | #if !defined (__NetBSD__) && !defined (__OpenBSD__) |
d427b66a | 403 | #include <elf.h> |
edfd76ce | 404 | #endif /* not __NetBSD__ and not __OpenBSD__ */ |
d427b66a | 405 | #include <sys/mman.h> |
d2b5bbda | 406 | #if defined (_SYSTYPE_SYSV) |
9240b21d RS |
407 | #include <sys/elf_mips.h> |
408 | #include <sym.h> | |
d2b5bbda | 409 | #endif /* _SYSTYPE_SYSV */ |
bc597cc7 | 410 | #if __sgi |
52da6a59 | 411 | #include <syms.h> /* for HDRR declaration */ |
bc597cc7 | 412 | #endif /* __sgi */ |
4dbcac31 | 413 | |
aff37336 SS |
414 | #ifndef MAP_ANON |
415 | #ifdef MAP_ANONYMOUS | |
416 | #define MAP_ANON MAP_ANONYMOUS | |
417 | #else | |
418 | #define MAP_ANON 0 | |
419 | #endif | |
420 | #endif | |
421 | ||
422 | #ifndef MAP_FAILED | |
423 | #define MAP_FAILED ((void *) -1) | |
424 | #endif | |
425 | ||
cb1ee811 | 426 | #if defined (__alpha__) && !defined (__NetBSD__) && !defined (__OpenBSD__) |
eabb24d0 RS |
427 | /* Declare COFF debugging symbol table. This used to be in |
428 | /usr/include/sym.h, but this file is no longer included in Red Hat | |
429 | 5.0 and presumably in any other glibc 2.x based distribution. */ | |
430 | typedef struct { | |
431 | short magic; | |
432 | short vstamp; | |
433 | int ilineMax; | |
434 | int idnMax; | |
435 | int ipdMax; | |
436 | int isymMax; | |
437 | int ioptMax; | |
438 | int iauxMax; | |
439 | int issMax; | |
440 | int issExtMax; | |
441 | int ifdMax; | |
442 | int crfd; | |
443 | int iextMax; | |
444 | long cbLine; | |
445 | long cbLineOffset; | |
446 | long cbDnOffset; | |
447 | long cbPdOffset; | |
448 | long cbSymOffset; | |
449 | long cbOptOffset; | |
450 | long cbAuxOffset; | |
451 | long cbSsOffset; | |
452 | long cbSsExtOffset; | |
453 | long cbFdOffset; | |
454 | long cbRfdOffset; | |
455 | long cbExtOffset; | |
7da3d06f | 456 | } HDRR, *pHDRR; |
5e617bc2 | 457 | #define cbHDRR sizeof (HDRR) |
eabb24d0 | 458 | #define hdrNil ((pHDRR)0) |
265b2695 RS |
459 | #endif |
460 | ||
e5d0f709 RS |
461 | #ifdef __NetBSD__ |
462 | /* | |
463 | * NetBSD does not have normal-looking user-land ELF support. | |
464 | */ | |
86dcf21c | 465 | # if defined __alpha__ || defined __sparc_v9__ || defined _LP64 |
e5d0f709 RS |
466 | # define ELFSIZE 64 |
467 | # else | |
468 | # define ELFSIZE 32 | |
469 | # endif | |
470 | # include <sys/exec_elf.h> | |
471 | ||
0007072a KR |
472 | # ifndef PT_LOAD |
473 | # define PT_LOAD Elf_pt_load | |
f4db570c GM |
474 | # if 0 /* was in pkgsrc patches for 20.7 */ |
475 | # define SHT_PROGBITS Elf_sht_progbits | |
476 | # endif | |
0007072a KR |
477 | # define SHT_SYMTAB Elf_sht_symtab |
478 | # define SHT_DYNSYM Elf_sht_dynsym | |
479 | # define SHT_NULL Elf_sht_null | |
480 | # define SHT_NOBITS Elf_sht_nobits | |
481 | # define SHT_REL Elf_sht_rel | |
482 | # define SHT_RELA Elf_sht_rela | |
483 | ||
484 | # define SHN_UNDEF Elf_eshn_undefined | |
485 | # define SHN_ABS Elf_eshn_absolute | |
486 | # define SHN_COMMON Elf_eshn_common | |
f4db570c | 487 | # endif /* !PT_LOAD */ |
e5d0f709 | 488 | |
e5d0f709 RS |
489 | # ifdef __alpha__ |
490 | # include <sys/exec_ecoff.h> | |
491 | # define HDRR struct ecoff_symhdr | |
492 | # define pHDRR HDRR * | |
f4db570c | 493 | # endif /* __alpha__ */ |
e5d0f709 | 494 | |
6b7d4ae4 | 495 | #ifdef __mips__ /* was in pkgsrc patches for 20.7 */ |
f4db570c GM |
496 | # define SHT_MIPS_DEBUG DT_MIPS_FLAGS |
497 | # define HDRR struct Elf_Shdr | |
498 | #endif /* __mips__ */ | |
6b7d4ae4 | 499 | #endif /* __NetBSD__ */ |
f4db570c | 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 | |
261cb4bb | 510 | # define ElfBitsW(bits, type) Elf##bits##_##type |
4973679b PE |
511 | # ifndef ELFSIZE |
512 | # ifdef _LP64 | |
513 | # define ELFSIZE 64 | |
514 | # else | |
515 | # define ELFSIZE 32 | |
516 | # endif | |
1b963cdd DL |
517 | # endif |
518 | /* This macro expands `bits' before invoking ElfBitsW. */ | |
519 | # define ElfExpandBitsW(bits, type) ElfBitsW (bits, type) | |
520 | # define ElfW(type) ElfExpandBitsW (ELFSIZE, type) | |
d427b66a JB |
521 | #endif |
522 | ||
f269bc61 | 523 | /* The code often converts ElfW (Half) values like e_shentsize to ptrdiff_t; |
5ee94506 PE |
524 | check that this doesn't lose information. */ |
525 | #include <intprops.h> | |
526 | #include <verify.h> | |
f269bc61 PE |
527 | verify ((! TYPE_SIGNED (ElfW (Half)) |
528 | || PTRDIFF_MIN <= TYPE_MINIMUM (ElfW (Half))) | |
529 | && TYPE_MAXIMUM (ElfW (Half)) <= PTRDIFF_MAX); | |
5ee94506 PE |
530 | |
531 | #ifdef UNEXELF_DEBUG | |
532 | # define DEBUG_LOG(expr) fprintf (stderr, #expr " 0x%jx\n", (uintmax_t) (expr)) | |
533 | #endif | |
534 | ||
d427b66a JB |
535 | /* Get the address of a particular section or program header entry, |
536 | * accounting for the size of the entries. | |
537 | */ | |
bc597cc7 | 538 | /* |
ea083293 RS |
539 | On PPC Reference Platform running Solaris 2.5.1 |
540 | the plt section is also of type NOBI like the bss section. | |
541 | (not really stored) and therefore sections after the bss | |
542 | section start at the plt offset. The plt section is always | |
543 | the one just before the bss section. | |
544 | Thus, we modify the test from | |
545 | if (NEW_SECTION_H (nn).sh_offset >= new_data2_offset) | |
546 | to | |
bc597cc7 | 547 | if (NEW_SECTION_H (nn).sh_offset >= |
ea083293 RS |
548 | OLD_SECTION_H (old_bss_index-1).sh_offset) |
549 | This is just a hack. We should put the new data section | |
550 | before the .plt section. | |
551 | And we should not have this routine at all but use | |
552 | the libelf library to read the old file and create the new | |
553 | file. | |
554 | The changed code is minimal and depends on prep set in m/prep.h | |
555 | Erik Deumens | |
556 | Quantum Theory Project | |
557 | University of Florida | |
558 | deumens@qtp.ufl.edu | |
559 | Apr 23, 1996 | |
560 | */ | |
d427b66a | 561 | |
5ee94506 | 562 | static void * |
f269bc61 | 563 | entry_address (void *section_h, ptrdiff_t idx, ptrdiff_t entsize) |
5ee94506 PE |
564 | { |
565 | char *h = section_h; | |
f269bc61 | 566 | return h + idx * entsize; |
5ee94506 PE |
567 | } |
568 | ||
d427b66a | 569 | #define OLD_SECTION_H(n) \ |
f269bc61 | 570 | (*(ElfW (Shdr) *) entry_address (old_section_h, n, old_file_h->e_shentsize)) |
d427b66a | 571 | #define NEW_SECTION_H(n) \ |
f269bc61 | 572 | (*(ElfW (Shdr) *) entry_address (new_section_h, n, new_file_h->e_shentsize)) |
d427b66a | 573 | #define NEW_PROGRAM_H(n) \ |
f269bc61 | 574 | (*(ElfW (Phdr) *) entry_address (new_program_h, n, new_file_h->e_phentsize)) |
d427b66a | 575 | |
5ee94506 | 576 | #define PATCH_INDEX(n) ((n) += old_bss_index <= (n)) |
d427b66a JB |
577 | typedef unsigned char byte; |
578 | ||
e40c4104 RS |
579 | /* Round X up to a multiple of Y. */ |
580 | ||
5e617bc2 JB |
581 | static ElfW (Addr) |
582 | round_up (ElfW (Addr) x, ElfW (Addr) y) | |
e40c4104 | 583 | { |
5ee94506 | 584 | ElfW (Addr) rem = x % y; |
e40c4104 RS |
585 | if (rem == 0) |
586 | return x; | |
587 | return x - rem + y; | |
588 | } | |
589 | ||
52da6a59 GM |
590 | /* Return the index of the section named NAME. |
591 | SECTION_NAMES, FILE_NAME and FILE_H give information | |
592 | about the file we are looking in. | |
593 | ||
594 | If we don't find the section NAME, that is a fatal error | |
5ee94506 | 595 | if NOERROR is false; return -1 if NOERROR is true. */ |
52da6a59 | 596 | |
f269bc61 | 597 | static ptrdiff_t |
dd5ecd6b | 598 | find_section (const char *name, const char *section_names, const char *file_name, |
5ee94506 PE |
599 | ElfW (Ehdr) *old_file_h, ElfW (Shdr) *old_section_h, |
600 | bool noerror) | |
52da6a59 | 601 | { |
f269bc61 | 602 | ptrdiff_t idx; |
52da6a59 GM |
603 | |
604 | for (idx = 1; idx < old_file_h->e_shnum; idx++) | |
605 | { | |
5ee94506 PE |
606 | char const *found_name = section_names + OLD_SECTION_H (idx).sh_name; |
607 | #ifdef UNEXELF_DEBUG | |
608 | fprintf (stderr, "Looking for %s - found %s\n", name, found_name); | |
52da6a59 | 609 | #endif |
5ee94506 PE |
610 | if (strcmp (name, found_name) == 0) |
611 | return idx; | |
52da6a59 GM |
612 | } |
613 | ||
5ee94506 PE |
614 | if (! noerror) |
615 | fatal ("Can't find %s in %s", name, file_name); | |
616 | return -1; | |
52da6a59 GM |
617 | } |
618 | ||
d427b66a JB |
619 | /* **************************************************************** |
620 | * unexec | |
621 | * | |
622 | * driving logic. | |
623 | * | |
624 | * In ELF, this works by replacing the old .bss section with a new | |
625 | * .data section, and inserting an empty .bss immediately afterwards. | |
626 | * | |
627 | */ | |
628 | void | |
dd5ecd6b | 629 | unexec (const char *new_name, const char *old_name) |
d427b66a | 630 | { |
5ee94506 PE |
631 | int new_file, old_file; |
632 | off_t new_file_size; | |
b3967b18 | 633 | void *new_break; |
b3967b18 | 634 | |
d9d54213 | 635 | /* Pointers to the base of the image of the two files. */ |
d427b66a JB |
636 | caddr_t old_base, new_base; |
637 | ||
aff37336 SS |
638 | #if MAP_ANON == 0 |
639 | int mmap_fd; | |
640 | #else | |
641 | # define mmap_fd -1 | |
642 | #endif | |
643 | ||
d9d54213 RS |
644 | /* Pointers to the file, program and section headers for the old and |
645 | new files. */ | |
5e617bc2 JB |
646 | ElfW (Ehdr) *old_file_h, *new_file_h; |
647 | ElfW (Phdr) *old_program_h, *new_program_h; | |
648 | ElfW (Shdr) *old_section_h, *new_section_h; | |
d427b66a | 649 | |
d9d54213 | 650 | /* Point to the section name table in the old file. */ |
d427b66a JB |
651 | char *old_section_names; |
652 | ||
5e617bc2 JB |
653 | ElfW (Addr) old_bss_addr, new_bss_addr; |
654 | ElfW (Word) old_bss_size, new_data2_size; | |
655 | ElfW (Off) new_data2_offset; | |
656 | ElfW (Addr) new_data2_addr; | |
657 | ElfW (Off) old_bss_offset; | |
658 | ElfW (Word) new_data2_incr; | |
d427b66a | 659 | |
f269bc61 PE |
660 | ptrdiff_t n, nn; |
661 | ptrdiff_t old_bss_index, old_sbss_index, old_plt_index; | |
662 | ptrdiff_t old_data_index, new_data2_index; | |
de6dbc14 | 663 | #if defined _SYSTYPE_SYSV || defined __sgi |
f269bc61 | 664 | ptrdiff_t old_mdebug_index; |
de6dbc14 | 665 | #endif |
d427b66a | 666 | struct stat stat_buf; |
5ee94506 | 667 | off_t old_file_size; |
f269bc61 | 668 | int mask; |
d427b66a | 669 | |
6fb8339c | 670 | /* Open the old file, allocate a buffer of the right size, and read |
d9d54213 | 671 | in the file contents. */ |
d427b66a | 672 | |
406af475 | 673 | old_file = emacs_open (old_name, O_RDONLY, 0); |
d427b66a JB |
674 | |
675 | if (old_file < 0) | |
5ee94506 | 676 | fatal ("Can't open %s for reading: %s", old_name, strerror (errno)); |
d427b66a | 677 | |
5ee94506 PE |
678 | if (fstat (old_file, &stat_buf) != 0) |
679 | fatal ("Can't fstat (%s): %s", old_name, strerror (errno)); | |
d427b66a | 680 | |
aff37336 | 681 | #if MAP_ANON == 0 |
406af475 | 682 | mmap_fd = emacs_open ("/dev/zero", O_RDONLY, 0); |
aff37336 | 683 | if (mmap_fd < 0) |
5ee94506 | 684 | fatal ("Can't open /dev/zero for reading: %s", strerror (errno)); |
aff37336 SS |
685 | #endif |
686 | ||
86928dfb GM |
687 | /* We cannot use malloc here because that may use sbrk. If it does, |
688 | we'd dump our temporary buffers with Emacs, and we'd have to be | |
689 | extra careful to use the correct value of sbrk(0) after | |
690 | allocating all buffers in the code below, which we aren't. */ | |
691 | old_file_size = stat_buf.st_size; | |
5ee94506 PE |
692 | if (! (0 <= old_file_size && old_file_size <= SIZE_MAX)) |
693 | fatal ("File size out of range"); | |
86928dfb | 694 | old_base = mmap (NULL, old_file_size, PROT_READ | PROT_WRITE, |
aff37336 SS |
695 | MAP_ANON | MAP_PRIVATE, mmap_fd, 0); |
696 | if (old_base == MAP_FAILED) | |
5ee94506 | 697 | fatal ("Can't allocate buffer for %s: %s", old_name, strerror (errno)); |
d427b66a | 698 | |
5ee94506 PE |
699 | if (read (old_file, old_base, old_file_size) != old_file_size) |
700 | fatal ("Didn't read all of %s: %s", old_name, strerror (errno)); | |
6fb8339c | 701 | |
d427b66a JB |
702 | /* Get pointers to headers & section names */ |
703 | ||
5e617bc2 JB |
704 | old_file_h = (ElfW (Ehdr) *) old_base; |
705 | old_program_h = (ElfW (Phdr) *) ((byte *) old_base + old_file_h->e_phoff); | |
706 | old_section_h = (ElfW (Shdr) *) ((byte *) old_base + old_file_h->e_shoff); | |
d427b66a | 707 | old_section_names = (char *) old_base |
d7cb42c3 | 708 | + OLD_SECTION_H (old_file_h->e_shstrndx).sh_offset; |
d427b66a | 709 | |
52da6a59 GM |
710 | /* Find the mdebug section, if any. */ |
711 | ||
de6dbc14 | 712 | #if defined _SYSTYPE_SYSV || defined __sgi |
52da6a59 GM |
713 | old_mdebug_index = find_section (".mdebug", old_section_names, |
714 | old_name, old_file_h, old_section_h, 1); | |
de6dbc14 | 715 | #endif |
52da6a59 | 716 | |
d427b66a | 717 | /* Find the old .bss section. Figure out parameters of the new |
d9d54213 | 718 | data2 and bss sections. */ |
d427b66a | 719 | |
52da6a59 GM |
720 | old_bss_index = find_section (".bss", old_section_names, |
721 | old_name, old_file_h, old_section_h, 0); | |
d427b66a | 722 | |
52da6a59 GM |
723 | old_sbss_index = find_section (".sbss", old_section_names, |
724 | old_name, old_file_h, old_section_h, 1); | |
1b963cdd | 725 | if (old_sbss_index != -1) |
825dad89 | 726 | if (OLD_SECTION_H (old_sbss_index).sh_type != SHT_NOBITS) |
1b963cdd | 727 | old_sbss_index = -1; |
52da6a59 | 728 | |
825dad89 AS |
729 | /* PowerPC64 has .plt in the BSS section. */ |
730 | old_plt_index = find_section (".plt", old_section_names, | |
731 | old_name, old_file_h, old_section_h, 1); | |
732 | if (old_plt_index != -1) | |
733 | if (OLD_SECTION_H (old_plt_index).sh_type != SHT_NOBITS) | |
734 | old_plt_index = -1; | |
735 | ||
736 | if (old_sbss_index == -1 && old_plt_index == -1) | |
9240b21d | 737 | { |
52da6a59 GM |
738 | old_bss_addr = OLD_SECTION_H (old_bss_index).sh_addr; |
739 | old_bss_size = OLD_SECTION_H (old_bss_index).sh_size; | |
826ba17e | 740 | old_bss_offset = OLD_SECTION_H (old_bss_index).sh_offset; |
9240b21d RS |
741 | new_data2_index = old_bss_index; |
742 | } | |
825dad89 AS |
743 | else if (old_plt_index != -1 |
744 | && (old_sbss_index == -1 | |
745 | || (OLD_SECTION_H (old_sbss_index).sh_addr | |
746 | > OLD_SECTION_H (old_plt_index).sh_addr))) | |
747 | { | |
748 | old_bss_addr = OLD_SECTION_H (old_plt_index).sh_addr; | |
749 | old_bss_size = OLD_SECTION_H (old_bss_index).sh_size | |
750 | + OLD_SECTION_H (old_plt_index).sh_size; | |
751 | if (old_sbss_index != -1) | |
752 | old_bss_size += OLD_SECTION_H (old_sbss_index).sh_size; | |
826ba17e | 753 | old_bss_offset = OLD_SECTION_H (old_plt_index).sh_offset; |
825dad89 AS |
754 | new_data2_index = old_plt_index; |
755 | } | |
9240b21d RS |
756 | else |
757 | { | |
52da6a59 GM |
758 | old_bss_addr = OLD_SECTION_H (old_sbss_index).sh_addr; |
759 | old_bss_size = OLD_SECTION_H (old_bss_index).sh_size | |
760 | + OLD_SECTION_H (old_sbss_index).sh_size; | |
826ba17e | 761 | old_bss_offset = OLD_SECTION_H (old_sbss_index).sh_offset; |
9240b21d RS |
762 | new_data2_index = old_sbss_index; |
763 | } | |
764 | ||
52da6a59 GM |
765 | /* Find the old .data section. Figure out parameters of |
766 | the new data2 and bss sections. */ | |
767 | ||
768 | old_data_index = find_section (".data", old_section_names, | |
769 | old_name, old_file_h, old_section_h, 0); | |
bc597cc7 | 770 | |
b3967b18 | 771 | new_break = sbrk (0); |
5e617bc2 | 772 | new_bss_addr = (ElfW (Addr)) new_break; |
d427b66a JB |
773 | new_data2_addr = old_bss_addr; |
774 | new_data2_size = new_bss_addr - old_bss_addr; | |
826ba17e AS |
775 | new_data2_offset = OLD_SECTION_H (old_data_index).sh_offset |
776 | + (new_data2_addr - OLD_SECTION_H (old_data_index).sh_addr); | |
777 | /* This is the amount by which the sections following the bss sections | |
778 | must be shifted in the image. It can differ from new_data2_size if | |
779 | the end of the old .data section (and thus the offset of the .bss | |
780 | section) was unaligned. */ | |
781 | new_data2_incr = new_data2_size + (new_data2_offset - old_bss_offset); | |
d427b66a | 782 | |
5ee94506 | 783 | #ifdef UNEXELF_DEBUG |
f269bc61 | 784 | fprintf (stderr, "old_bss_index %td\n", old_bss_index); |
5ee94506 PE |
785 | DEBUG_LOG (old_bss_addr); |
786 | DEBUG_LOG (old_bss_size); | |
787 | DEBUG_LOG (old_bss_offset); | |
788 | DEBUG_LOG (new_bss_addr); | |
789 | DEBUG_LOG (new_data2_addr); | |
790 | DEBUG_LOG (new_data2_size); | |
791 | DEBUG_LOG (new_data2_offset); | |
792 | DEBUG_LOG (new_data2_incr); | |
d427b66a JB |
793 | #endif |
794 | ||
5ee94506 PE |
795 | if (new_bss_addr < old_bss_addr + old_bss_size) |
796 | fatal (".bss shrank when undumping"); | |
d427b66a | 797 | |
6fb8339c | 798 | /* Set the output file to the right size. Allocate a buffer to hold |
d9d54213 | 799 | the image of the new file. Set pointers to various interesting |
5ee94506 | 800 | objects. */ |
d427b66a | 801 | |
406af475 | 802 | new_file = emacs_open (new_name, O_RDWR | O_CREAT, 0666); |
d427b66a | 803 | if (new_file < 0) |
5ee94506 | 804 | fatal ("Can't creat (%s): %s", new_name, strerror (errno)); |
d427b66a | 805 | |
5ee94506 | 806 | new_file_size = old_file_size + old_file_h->e_shentsize + new_data2_incr; |
d427b66a JB |
807 | |
808 | if (ftruncate (new_file, new_file_size)) | |
5ee94506 | 809 | fatal ("Can't ftruncate (%s): %s", new_name, strerror (errno)); |
d427b66a | 810 | |
86928dfb | 811 | new_base = mmap (NULL, new_file_size, PROT_READ | PROT_WRITE, |
aff37336 SS |
812 | MAP_ANON | MAP_PRIVATE, mmap_fd, 0); |
813 | if (new_base == MAP_FAILED) | |
5ee94506 | 814 | fatal ("Can't allocate buffer for %s: %s", old_name, strerror (errno)); |
6fb8339c | 815 | |
5e617bc2 JB |
816 | new_file_h = (ElfW (Ehdr) *) new_base; |
817 | new_program_h = (ElfW (Phdr) *) ((byte *) new_base + old_file_h->e_phoff); | |
818 | new_section_h = (ElfW (Shdr) *) | |
826ba17e | 819 | ((byte *) new_base + old_file_h->e_shoff + new_data2_incr); |
d427b66a JB |
820 | |
821 | /* Make our new file, program and section headers as copies of the | |
d9d54213 | 822 | originals. */ |
d427b66a JB |
823 | |
824 | memcpy (new_file_h, old_file_h, old_file_h->e_ehsize); | |
825 | memcpy (new_program_h, old_program_h, | |
826 | old_file_h->e_phnum * old_file_h->e_phentsize); | |
e40c4104 RS |
827 | |
828 | /* Modify the e_shstrndx if necessary. */ | |
829 | PATCH_INDEX (new_file_h->e_shstrndx); | |
d427b66a JB |
830 | |
831 | /* Fix up file header. We'll add one section. Section header is | |
d9d54213 | 832 | further away now. */ |
d427b66a | 833 | |
826ba17e | 834 | new_file_h->e_shoff += new_data2_incr; |
d427b66a JB |
835 | new_file_h->e_shnum += 1; |
836 | ||
5ee94506 PE |
837 | #ifdef UNEXELF_DEBUG |
838 | DEBUG_LOG (old_file_h->e_shoff); | |
f269bc61 | 839 | fprintf (stderr, "Old section count %td\n", (ptrdiff_t) old_file_h->e_shnum); |
5ee94506 | 840 | DEBUG_LOG (new_file_h->e_shoff); |
f269bc61 | 841 | fprintf (stderr, "New section count %td\n", (ptrdiff_t) new_file_h->e_shnum); |
d427b66a JB |
842 | #endif |
843 | ||
844 | /* Fix up a new program header. Extend the writable data segment so | |
d9d54213 RS |
845 | that the bss area is covered too. Find that segment by looking |
846 | for a segment that ends just before the .bss area. Make sure | |
847 | that no segments are above the new .data2. Put a loop at the end | |
848 | to adjust the offset and address of any segment that is above | |
849 | data2, just in case we decide to allow this later. */ | |
d427b66a | 850 | |
5ee94506 | 851 | for (n = new_file_h->e_phnum; --n >= 0; ) |
d427b66a | 852 | { |
e40c4104 | 853 | /* Compute maximum of all requirements for alignment of section. */ |
5e617bc2 | 854 | ElfW (Word) alignment = (NEW_PROGRAM_H (n)).p_align; |
e40c4104 RS |
855 | if ((OLD_SECTION_H (old_bss_index)).sh_addralign > alignment) |
856 | alignment = OLD_SECTION_H (old_bss_index).sh_addralign; | |
857 | ||
52da6a59 | 858 | #ifdef __sgi |
bc597cc7 KH |
859 | /* According to r02kar@x4u2.desy.de (Karsten Kuenne) |
860 | and oliva@gnu.org (Alexandre Oliva), on IRIX 5.2, we | |
861 | always get "Program segment above .bss" when dumping | |
862 | when the executable doesn't have an sbss section. */ | |
863 | if (old_sbss_index != -1) | |
52da6a59 | 864 | #endif /* __sgi */ |
9240b21d | 865 | if (NEW_PROGRAM_H (n).p_vaddr + NEW_PROGRAM_H (n).p_filesz |
bc597cc7 KH |
866 | > (old_sbss_index == -1 |
867 | ? old_bss_addr | |
868 | : round_up (old_bss_addr, alignment))) | |
5ee94506 | 869 | fatal ("Program segment above .bss in %s", old_name); |
d427b66a | 870 | |
d7cb42c3 | 871 | if (NEW_PROGRAM_H (n).p_type == PT_LOAD |
e40c4104 RS |
872 | && (round_up ((NEW_PROGRAM_H (n)).p_vaddr |
873 | + (NEW_PROGRAM_H (n)).p_filesz, | |
874 | alignment) | |
875 | == round_up (old_bss_addr, alignment))) | |
d427b66a JB |
876 | break; |
877 | } | |
878 | if (n < 0) | |
5ee94506 | 879 | fatal ("Couldn't find segment next to .bss in %s", old_name); |
d427b66a | 880 | |
c1937d6a AS |
881 | /* Make sure that the size includes any padding before the old .bss |
882 | section. */ | |
883 | NEW_PROGRAM_H (n).p_filesz = new_bss_addr - NEW_PROGRAM_H (n).p_vaddr; | |
d7cb42c3 | 884 | NEW_PROGRAM_H (n).p_memsz = NEW_PROGRAM_H (n).p_filesz; |
d427b66a JB |
885 | |
886 | #if 0 /* Maybe allow section after data2 - does this ever happen? */ | |
5ee94506 | 887 | for (n = new_file_h->e_phnum; --n >= 0; ) |
d427b66a | 888 | { |
d7cb42c3 RS |
889 | if (NEW_PROGRAM_H (n).p_vaddr |
890 | && NEW_PROGRAM_H (n).p_vaddr >= new_data2_addr) | |
891 | NEW_PROGRAM_H (n).p_vaddr += new_data2_size - old_bss_size; | |
d427b66a | 892 | |
d7cb42c3 | 893 | if (NEW_PROGRAM_H (n).p_offset >= new_data2_offset) |
826ba17e | 894 | NEW_PROGRAM_H (n).p_offset += new_data2_incr; |
d427b66a JB |
895 | } |
896 | #endif | |
897 | ||
898 | /* Fix up section headers based on new .data2 section. Any section | |
d9d54213 RS |
899 | whose offset or virtual address is after the new .data2 section |
900 | gets its value adjusted. .bss size becomes zero and new address | |
901 | is set. data2 section header gets added by copying the existing | |
902 | .data header and modifying the offset, address and size. */ | |
d427b66a | 903 | |
994a65f3 | 904 | /* Walk through all section headers, insert the new data2 section right |
e40c4104 | 905 | before the new bss section. */ |
5ee94506 | 906 | for (n = 1, nn = 1; n < old_file_h->e_shnum; n++, nn++) |
d427b66a JB |
907 | { |
908 | caddr_t src; | |
9240b21d RS |
909 | /* If it is (s)bss section, insert the new data2 section before it. */ |
910 | /* new_data2_index is the index of either old_sbss or old_bss, that was | |
911 | chosen as a section for new_data2. */ | |
bc597cc7 | 912 | if (n == new_data2_index) |
e40c4104 RS |
913 | { |
914 | /* Steal the data section header for this data2 section. */ | |
d7cb42c3 | 915 | memcpy (&NEW_SECTION_H (nn), &OLD_SECTION_H (old_data_index), |
e40c4104 | 916 | new_file_h->e_shentsize); |
994a65f3 | 917 | |
d7cb42c3 RS |
918 | NEW_SECTION_H (nn).sh_addr = new_data2_addr; |
919 | NEW_SECTION_H (nn).sh_offset = new_data2_offset; | |
920 | NEW_SECTION_H (nn).sh_size = new_data2_size; | |
e40c4104 RS |
921 | /* Use the bss section's alignment. This will assure that the |
922 | new data2 section always be placed in the same spot as the old | |
923 | bss section by any other application. */ | |
d7cb42c3 | 924 | NEW_SECTION_H (nn).sh_addralign = OLD_SECTION_H (n).sh_addralign; |
e40c4104 RS |
925 | |
926 | /* Now copy over what we have in the memory now. */ | |
994a65f3 RM |
927 | memcpy (NEW_SECTION_H (nn).sh_offset + new_base, |
928 | (caddr_t) OLD_SECTION_H (n).sh_addr, | |
e40c4104 RS |
929 | new_data2_size); |
930 | nn++; | |
931 | } | |
994a65f3 RM |
932 | |
933 | memcpy (&NEW_SECTION_H (nn), &OLD_SECTION_H (n), | |
e40c4104 | 934 | old_file_h->e_shentsize); |
7da3d06f | 935 | |
9240b21d | 936 | if (n == old_bss_index |
9240b21d RS |
937 | /* The new bss and sbss section's size is zero, and its file offset |
938 | and virtual address should be off by NEW_DATA2_SIZE. */ | |
825dad89 | 939 | || n == old_sbss_index || n == old_plt_index |
9240b21d | 940 | ) |
e40c4104 | 941 | { |
bc597cc7 | 942 | /* NN should be `old_s?bss_index + 1' at this point. */ |
826ba17e AS |
943 | NEW_SECTION_H (nn).sh_offset = new_data2_offset + new_data2_size; |
944 | NEW_SECTION_H (nn).sh_addr = new_data2_addr + new_data2_size; | |
e40c4104 | 945 | /* Let the new bss section address alignment be the same as the |
994a65f3 | 946 | section address alignment followed the old bss section, so |
e40c4104 | 947 | this section will be placed in exactly the same place. */ |
d7cb42c3 RS |
948 | NEW_SECTION_H (nn).sh_addralign = OLD_SECTION_H (nn).sh_addralign; |
949 | NEW_SECTION_H (nn).sh_size = 0; | |
e40c4104 | 950 | } |
85b2e0ee RS |
951 | else |
952 | { | |
ad537856 | 953 | /* Any section that was originally placed after the .bss |
826ba17e | 954 | section should now be off by NEW_DATA2_INCR. If a |
ad537856 RS |
955 | section overlaps the .bss section, consider it to be |
956 | placed after the .bss section. Overlap can occur if the | |
957 | section just before .bss has less-strict alignment; this | |
958 | was observed between .symtab and .bss on Solaris 2.5.1 | |
bcda200f | 959 | (sparc) with GCC snapshot 960602. |
f2a77c3a | 960 | |
bcda200f YM |
961 | > dump -h temacs |
962 | ||
963 | temacs: | |
964 | ||
965 | **** SECTION HEADER TABLE **** | |
966 | [No] Type Flags Addr Offset Size Name | |
967 | Link Info Adralgn Entsize | |
968 | ||
969 | [22] 1 3 0x335150 0x315150 0x4 .data.rel.local | |
b3967b18 | 970 | 0 0 0x4 0 |
bcda200f YM |
971 | |
972 | [23] 8 3 0x335158 0x315158 0x42720 .bss | |
b3967b18 | 973 | 0 0 0x8 0 |
bcda200f YM |
974 | |
975 | [24] 2 0 0 0x315154 0x1c9d0 .symtab | |
b3967b18 | 976 | 25 1709 0x4 0x10 |
bcda200f YM |
977 | */ |
978 | ||
979 | if (NEW_SECTION_H (nn).sh_offset >= old_bss_offset | |
980 | || (NEW_SECTION_H (nn).sh_offset + NEW_SECTION_H (nn).sh_size | |
981 | > new_data2_offset)) | |
826ba17e | 982 | NEW_SECTION_H (nn).sh_offset += new_data2_incr; |
f2a77c3a | 983 | |
85b2e0ee RS |
984 | /* Any section that was originally placed after the section |
985 | header table should now be off by the size of one section | |
986 | header table entry. */ | |
987 | if (NEW_SECTION_H (nn).sh_offset > new_file_h->e_shoff) | |
988 | NEW_SECTION_H (nn).sh_offset += new_file_h->e_shentsize; | |
989 | } | |
990 | ||
e40c4104 | 991 | /* If any section hdr refers to the section after the new .data |
994a65f3 | 992 | section, make it refer to next one because we have inserted |
8917361f | 993 | a new section in between. */ |
994a65f3 | 994 | |
d7cb42c3 | 995 | PATCH_INDEX (NEW_SECTION_H (nn).sh_link); |
8917361f RS |
996 | /* For symbol tables, info is a symbol table index, |
997 | so don't change it. */ | |
998 | if (NEW_SECTION_H (nn).sh_type != SHT_SYMTAB | |
999 | && NEW_SECTION_H (nn).sh_type != SHT_DYNSYM) | |
1000 | PATCH_INDEX (NEW_SECTION_H (nn).sh_info); | |
7da3d06f | 1001 | |
1b963cdd DL |
1002 | if (old_sbss_index != -1) |
1003 | if (!strcmp (old_section_names + NEW_SECTION_H (nn).sh_name, ".sbss")) | |
1004 | { | |
7da3d06f | 1005 | NEW_SECTION_H (nn).sh_offset = |
1b963cdd DL |
1006 | round_up (NEW_SECTION_H (nn).sh_offset, |
1007 | NEW_SECTION_H (nn).sh_addralign); | |
1008 | NEW_SECTION_H (nn).sh_type = SHT_PROGBITS; | |
1009 | } | |
8917361f RS |
1010 | |
1011 | /* Now, start to copy the content of sections. */ | |
d7cb42c3 RS |
1012 | if (NEW_SECTION_H (nn).sh_type == SHT_NULL |
1013 | || NEW_SECTION_H (nn).sh_type == SHT_NOBITS) | |
d427b66a | 1014 | continue; |
994a65f3 | 1015 | |
e40c4104 | 1016 | /* Write out the sections. .data and .data1 (and data2, called |
8917361f RS |
1017 | ".data" in the strings table) get copied from the current process |
1018 | instead of the old file. */ | |
d7cb42c3 | 1019 | if (!strcmp (old_section_names + NEW_SECTION_H (n).sh_name, ".data") |
9240b21d RS |
1020 | || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name), |
1021 | ".sdata") | |
1022 | || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name), | |
1023 | ".lit4") | |
1024 | || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name), | |
1025 | ".lit8") | |
d4e3d7f2 RS |
1026 | /* The conditional bit below was in Oliva's original code |
1027 | (1999-08-25) and seems to have been dropped by mistake | |
1028 | subsequently. It prevents a crash at startup under X in | |
0b381c7e | 1029 | `IRIX64 6.5 6.5.17m', whether compiled on that release or |
7da3d06f DL |
1030 | an earlier one. It causes no trouble on the other ELF |
1031 | platforms I could test (Irix 6.5.15m, Solaris 8, Debian | |
1032 | Potato x86, Debian Woody SPARC); however, it's reported | |
1033 | to cause crashes under some version of GNU/Linux. It's | |
1034 | not yet clear what's changed in that Irix version to | |
1035 | cause the problem, or why the fix sometimes fails under | |
1036 | GNU/Linux. There's probably no good reason to have | |
1037 | something Irix-specific here, but this will have to do | |
1038 | for now. IRIX6_5 is the most specific macro we have to | |
1039 | test. -- fx 2002-10-01 | |
1040 | ||
1041 | The issue _looks_ as though it's gone away on 6.5.18m, | |
1042 | but maybe it's still lurking, to be triggered by some | |
1043 | change in the binary. It appears to concern the dynamic | |
1044 | loader, but I never got anywhere with an SGI support call | |
1045 | seeking clues. -- fx 2002-11-29. */ | |
d4e3d7f2 RS |
1046 | #ifdef IRIX6_5 |
1047 | || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name), | |
1048 | ".got") | |
1049 | #endif | |
bc597cc7 KH |
1050 | || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name), |
1051 | ".sdata1") | |
d7cb42c3 | 1052 | || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name), |
1b963cdd | 1053 | ".data1") |
6108b49c | 1054 | || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name), |
1b963cdd | 1055 | ".sbss")) |
d7cb42c3 | 1056 | src = (caddr_t) OLD_SECTION_H (n).sh_addr; |
d427b66a | 1057 | else |
d7cb42c3 | 1058 | src = old_base + OLD_SECTION_H (n).sh_offset; |
994a65f3 | 1059 | |
d7cb42c3 RS |
1060 | memcpy (NEW_SECTION_H (nn).sh_offset + new_base, src, |
1061 | NEW_SECTION_H (nn).sh_size); | |
e40c4104 | 1062 | |
590bd467 | 1063 | #if defined __alpha__ && !defined __OpenBSD__ |
265b2695 RS |
1064 | /* Update Alpha COFF symbol table: */ |
1065 | if (strcmp (old_section_names + OLD_SECTION_H (n).sh_name, ".mdebug") | |
1066 | == 0) | |
1067 | { | |
1068 | pHDRR symhdr = (pHDRR) (NEW_SECTION_H (nn).sh_offset + new_base); | |
1069 | ||
1070 | symhdr->cbLineOffset += new_data2_size; | |
1071 | symhdr->cbDnOffset += new_data2_size; | |
1072 | symhdr->cbPdOffset += new_data2_size; | |
1073 | symhdr->cbSymOffset += new_data2_size; | |
1074 | symhdr->cbOptOffset += new_data2_size; | |
1075 | symhdr->cbAuxOffset += new_data2_size; | |
1076 | symhdr->cbSsOffset += new_data2_size; | |
1077 | symhdr->cbSsExtOffset += new_data2_size; | |
1078 | symhdr->cbFdOffset += new_data2_size; | |
1079 | symhdr->cbRfdOffset += new_data2_size; | |
1080 | symhdr->cbExtOffset += new_data2_size; | |
1081 | } | |
590bd467 | 1082 | #endif /* __alpha__ && !__OpenBSD__ */ |
265b2695 | 1083 | |
d2b5bbda | 1084 | #if defined (_SYSTYPE_SYSV) |
52da6a59 | 1085 | if (NEW_SECTION_H (nn).sh_type == SHT_MIPS_DEBUG |
7da3d06f | 1086 | && old_mdebug_index != -1) |
826ba17e | 1087 | { |
f269bc61 PE |
1088 | ptrdiff_t new_offset = NEW_SECTION_H (nn).sh_offset; |
1089 | ptrdiff_t old_offset = OLD_SECTION_H (old_mdebug_index).sh_offset; | |
1090 | ptrdiff_t diff = new_offset - old_offset; | |
9240b21d RS |
1091 | HDRR *phdr = (HDRR *)(NEW_SECTION_H (nn).sh_offset + new_base); |
1092 | ||
1093 | if (diff) | |
1094 | { | |
1095 | phdr->cbLineOffset += diff; | |
1096 | phdr->cbDnOffset += diff; | |
1097 | phdr->cbPdOffset += diff; | |
1098 | phdr->cbSymOffset += diff; | |
1099 | phdr->cbOptOffset += diff; | |
1100 | phdr->cbAuxOffset += diff; | |
1101 | phdr->cbSsOffset += diff; | |
1102 | phdr->cbSsExtOffset += diff; | |
1103 | phdr->cbFdOffset += diff; | |
1104 | phdr->cbRfdOffset += diff; | |
1105 | phdr->cbExtOffset += diff; | |
1106 | } | |
1107 | } | |
d2b5bbda | 1108 | #endif /* _SYSTYPE_SYSV */ |
bc597cc7 KH |
1109 | |
1110 | #if __sgi | |
7da3d06f | 1111 | /* Adjust the HDRR offsets in .mdebug and copy the |
bc597cc7 KH |
1112 | line data if it's in its usual 'hole' in the object. |
1113 | Makes the new file debuggable with dbx. | |
1114 | patches up two problems: the absolute file offsets | |
1115 | in the HDRR record of .mdebug (see /usr/include/syms.h), and | |
1116 | the ld bug that gets the line table in a hole in the | |
1117 | elf file rather than in the .mdebug section proper. | |
1118 | David Anderson. davea@sgi.com Jan 16,1994. */ | |
1119 | if (n == old_mdebug_index) | |
1120 | { | |
1121 | #define MDEBUGADJUST(__ct,__fileaddr) \ | |
1122 | if (n_phdrr->__ct > 0) \ | |
1123 | { \ | |
1124 | n_phdrr->__fileaddr += movement; \ | |
1125 | } | |
1126 | ||
1127 | HDRR * o_phdrr = (HDRR *)((byte *)old_base + OLD_SECTION_H (n).sh_offset); | |
1128 | HDRR * n_phdrr = (HDRR *)((byte *)new_base + NEW_SECTION_H (nn).sh_offset); | |
1129 | unsigned movement = new_data2_size; | |
1130 | ||
1131 | MDEBUGADJUST (idnMax, cbDnOffset); | |
1132 | MDEBUGADJUST (ipdMax, cbPdOffset); | |
1133 | MDEBUGADJUST (isymMax, cbSymOffset); | |
1134 | MDEBUGADJUST (ioptMax, cbOptOffset); | |
1135 | MDEBUGADJUST (iauxMax, cbAuxOffset); | |
1136 | MDEBUGADJUST (issMax, cbSsOffset); | |
1137 | MDEBUGADJUST (issExtMax, cbSsExtOffset); | |
1138 | MDEBUGADJUST (ifdMax, cbFdOffset); | |
1139 | MDEBUGADJUST (crfd, cbRfdOffset); | |
1140 | MDEBUGADJUST (iextMax, cbExtOffset); | |
1141 | /* The Line Section, being possible off in a hole of the object, | |
1142 | requires special handling. */ | |
1143 | if (n_phdrr->cbLine > 0) | |
1144 | { | |
1145 | if (o_phdrr->cbLineOffset > (OLD_SECTION_H (n).sh_offset | |
1146 | + OLD_SECTION_H (n).sh_size)) | |
1147 | { | |
1148 | /* line data is in a hole in elf. do special copy and adjust | |
1149 | for this ld mistake. | |
1150 | */ | |
1151 | n_phdrr->cbLineOffset += movement; | |
1152 | ||
1153 | memcpy (n_phdrr->cbLineOffset + new_base, | |
1154 | o_phdrr->cbLineOffset + old_base, n_phdrr->cbLine); | |
1155 | } | |
1156 | else | |
1157 | { | |
1158 | /* somehow line data is in .mdebug as it is supposed to be. */ | |
1159 | MDEBUGADJUST (cbLine, cbLineOffset); | |
1160 | } | |
1161 | } | |
1162 | } | |
1163 | #endif /* __sgi */ | |
1164 | ||
8917361f | 1165 | /* If it is the symbol table, its st_shndx field needs to be patched. */ |
d7cb42c3 RS |
1166 | if (NEW_SECTION_H (nn).sh_type == SHT_SYMTAB |
1167 | || NEW_SECTION_H (nn).sh_type == SHT_DYNSYM) | |
e40c4104 | 1168 | { |
5e617bc2 | 1169 | ElfW (Shdr) *spt = &NEW_SECTION_H (nn); |
f269bc61 | 1170 | ptrdiff_t num = spt->sh_size / spt->sh_entsize; |
5e617bc2 | 1171 | ElfW (Sym) * sym = (ElfW (Sym) *) (NEW_SECTION_H (nn).sh_offset + |
e40c4104 RS |
1172 | new_base); |
1173 | for (; num--; sym++) | |
1174 | { | |
1175 | if ((sym->st_shndx == SHN_UNDEF) | |
1176 | || (sym->st_shndx == SHN_ABS) | |
1177 | || (sym->st_shndx == SHN_COMMON)) | |
1178 | continue; | |
994a65f3 | 1179 | |
d7cb42c3 | 1180 | PATCH_INDEX (sym->st_shndx); |
e40c4104 RS |
1181 | } |
1182 | } | |
d427b66a JB |
1183 | } |
1184 | ||
8917361f | 1185 | /* Update the symbol values of _edata and _end. */ |
5ee94506 | 1186 | for (n = new_file_h->e_shnum; 0 < --n; ) |
8bf761ce RS |
1187 | { |
1188 | byte *symnames; | |
5e617bc2 | 1189 | ElfW (Sym) *symp, *symendp; |
8bf761ce RS |
1190 | |
1191 | if (NEW_SECTION_H (n).sh_type != SHT_DYNSYM | |
1192 | && NEW_SECTION_H (n).sh_type != SHT_SYMTAB) | |
1193 | continue; | |
1194 | ||
8c1e9afe KH |
1195 | symnames = ((byte *) new_base |
1196 | + NEW_SECTION_H (NEW_SECTION_H (n).sh_link).sh_offset); | |
5e617bc2 JB |
1197 | symp = (ElfW (Sym) *) (NEW_SECTION_H (n).sh_offset + new_base); |
1198 | symendp = (ElfW (Sym) *) ((byte *)symp + NEW_SECTION_H (n).sh_size); | |
8bf761ce RS |
1199 | |
1200 | for (; symp < symendp; symp ++) | |
bcda200f YM |
1201 | { |
1202 | if (strcmp ((char *) (symnames + symp->st_name), "_end") == 0 | |
1203 | || strcmp ((char *) (symnames + symp->st_name), "end") == 0 | |
1204 | || strcmp ((char *) (symnames + symp->st_name), "_edata") == 0 | |
1205 | || strcmp ((char *) (symnames + symp->st_name), "edata") == 0) | |
1206 | memcpy (&symp->st_value, &new_bss_addr, sizeof (new_bss_addr)); | |
1207 | ||
1208 | /* Strictly speaking, #ifdef below is not necessary. But we | |
1209 | keep it to indicate that this kind of change may also be | |
1210 | necessary for other unexecs to support GNUstep. */ | |
1211 | #ifdef NS_IMPL_GNUSTEP | |
1212 | /* ObjC runtime modifies the values of some data structures | |
1213 | such as classes and selectors in the .data section after | |
1214 | loading. As the dump process copies the .data section | |
1215 | from the current process, that causes problems when the | |
1216 | modified classes are reinitialized in the dumped | |
1217 | executable. We copy such data from the old file, not | |
1218 | from the current process. */ | |
1219 | if (strncmp ((char *) (symnames + symp->st_name), | |
1220 | "_OBJC_", sizeof ("_OBJC_") - 1) == 0) | |
1221 | { | |
1222 | caddr_t old, new; | |
1223 | ||
1224 | new = ((symp->st_value - NEW_SECTION_H (symp->st_shndx).sh_addr) | |
1225 | + NEW_SECTION_H (symp->st_shndx).sh_offset + new_base); | |
1226 | /* "Unpatch" index. */ | |
1227 | nn = symp->st_shndx; | |
1228 | if (nn > old_bss_index) | |
1229 | nn--; | |
b34d7317 YM |
1230 | if (nn == old_bss_index) |
1231 | memset (new, 0, symp->st_size); | |
1232 | else | |
1233 | { | |
1234 | old = ((symp->st_value | |
1235 | - NEW_SECTION_H (symp->st_shndx).sh_addr) | |
1236 | + OLD_SECTION_H (nn).sh_offset + old_base); | |
1237 | memcpy (new, old, symp->st_size); | |
1238 | } | |
bcda200f YM |
1239 | } |
1240 | #endif | |
1241 | } | |
8bf761ce RS |
1242 | } |
1243 | ||
48240339 KH |
1244 | /* This loop seeks out relocation sections for the data section, so |
1245 | that it can undo relocations performed by the runtime linker. */ | |
5ee94506 | 1246 | for (n = new_file_h->e_shnum; 0 < --n; ) |
48240339 | 1247 | { |
5e617bc2 | 1248 | ElfW (Shdr) section = NEW_SECTION_H (n); |
642ffd98 RS |
1249 | |
1250 | /* Cause a compilation error if anyone uses n instead of nn below. */ | |
9ae71512 PE |
1251 | #define n ((void) 0); |
1252 | n /* Prevent 'macro "n" is not used' warnings. */ | |
642ffd98 | 1253 | |
7da3d06f | 1254 | switch (section.sh_type) |
642ffd98 RS |
1255 | { |
1256 | default: | |
1257 | break; | |
1258 | case SHT_REL: | |
1259 | case SHT_RELA: | |
1260 | /* This code handles two different size structs, but there should | |
1261 | be no harm in that provided that r_offset is always the first | |
1262 | member. */ | |
1263 | nn = section.sh_info; | |
1264 | if (!strcmp (old_section_names + NEW_SECTION_H (nn).sh_name, ".data") | |
1265 | || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name), | |
1266 | ".sdata") | |
1267 | || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name), | |
1268 | ".lit4") | |
1269 | || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name), | |
1270 | ".lit8") | |
d4e3d7f2 RS |
1271 | #ifdef IRIX6_5 /* see above */ |
1272 | || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name), | |
1273 | ".got") | |
1274 | #endif | |
642ffd98 RS |
1275 | || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name), |
1276 | ".sdata1") | |
1277 | || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name), | |
1278 | ".data1")) | |
1279 | { | |
5e617bc2 | 1280 | ElfW (Addr) offset = (NEW_SECTION_H (nn).sh_addr |
642ffd98 RS |
1281 | - NEW_SECTION_H (nn).sh_offset); |
1282 | caddr_t reloc = old_base + section.sh_offset, end; | |
1283 | for (end = reloc + section.sh_size; reloc < end; | |
1284 | reloc += section.sh_entsize) | |
1285 | { | |
5e617bc2 | 1286 | ElfW (Addr) addr = ((ElfW (Rel) *) reloc)->r_offset - offset; |
265b2695 | 1287 | #ifdef __alpha__ |
642ffd98 RS |
1288 | /* The Alpha ELF binutils currently have a bug that |
1289 | sometimes results in relocs that contain all | |
1290 | zeroes. Work around this for now... */ | |
5e617bc2 | 1291 | if (((ElfW (Rel) *) reloc)->r_offset == 0) |
265b2695 RS |
1292 | continue; |
1293 | #endif | |
5e617bc2 | 1294 | memcpy (new_base + addr, old_base + addr, sizeof (ElfW (Addr))); |
642ffd98 RS |
1295 | } |
1296 | } | |
1297 | break; | |
1298 | } | |
9ae71512 PE |
1299 | |
1300 | #undef n | |
48240339 | 1301 | } |
48240339 | 1302 | |
d9d54213 | 1303 | /* Write out new_file, and free the buffers. */ |
04f903c0 KH |
1304 | |
1305 | if (write (new_file, new_base, new_file_size) != new_file_size) | |
5ee94506 PE |
1306 | fatal ("Didn't write %lu bytes to %s: %s", |
1307 | (unsigned long) new_file_size, new_name, strerror (errno)); | |
86928dfb GM |
1308 | munmap (old_base, old_file_size); |
1309 | munmap (new_base, new_file_size); | |
6fb8339c | 1310 | |
d9d54213 | 1311 | /* Close the files and make the new file executable. */ |
d427b66a | 1312 | |
aff37336 | 1313 | #if MAP_ANON == 0 |
bacba3c2 | 1314 | emacs_close (mmap_fd); |
aff37336 SS |
1315 | #endif |
1316 | ||
bacba3c2 | 1317 | if (emacs_close (old_file) != 0) |
5ee94506 | 1318 | fatal ("Can't close (%s): %s", old_name, strerror (errno)); |
d427b66a | 1319 | |
bacba3c2 | 1320 | if (emacs_close (new_file) != 0) |
5ee94506 | 1321 | fatal ("Can't close (%s): %s", new_name, strerror (errno)); |
d427b66a | 1322 | |
5ee94506 PE |
1323 | if (stat (new_name, &stat_buf) != 0) |
1324 | fatal ("Can't stat (%s): %s", new_name, strerror (errno)); | |
d427b66a | 1325 | |
f269bc61 PE |
1326 | mask = umask (777); |
1327 | umask (mask); | |
1328 | stat_buf.st_mode |= 0111 & ~mask; | |
5ee94506 PE |
1329 | if (chmod (new_name, stat_buf.st_mode) != 0) |
1330 | fatal ("Can't chmod (%s): %s", new_name, strerror (errno)); | |
d427b66a | 1331 | } |