Commit | Line | Data |
---|---|---|
1e7b70b2 | 1 | /* Copyright (C) 1985,86,87,88,90,92,1999,2000,01,2003 |
e40c4104 | 2 | Free Software Foundation, Inc. |
d427b66a | 3 | |
3b7ad313 | 4 | This file is part of GNU Emacs. |
e40c4104 | 5 | |
3b7ad313 EN |
6 | GNU Emacs is free software; you can redistribute it and/or modify |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2, or (at your option) | |
9 | any later version. | |
e40c4104 | 10 | |
3b7ad313 EN |
11 | GNU Emacs is distributed in the hope that it will be useful, |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GNU Emacs; see the file COPYING. If not, write to | |
18 | the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
19 | Boston, MA 02111-1307, USA. | |
d427b66a JB |
20 | |
21 | In other words, you are welcome to use, share and improve this program. | |
22 | You are forbidden to forbid anyone else to use, share and improve | |
23 | what you give them. Help stamp out software-hoarding! */ | |
24 | ||
25 | ||
26 | /* | |
27 | * unexec.c - Convert a running program into an a.out file. | |
28 | * | |
29 | * Author: Spencer W. Thomas | |
30 | * Computer Science Dept. | |
31 | * University of Utah | |
32 | * Date: Tue Mar 2 1982 | |
33 | * Modified heavily since then. | |
34 | * | |
35 | * Synopsis: | |
89b95605 RS |
36 | * unexec (new_name, old_name, data_start, bss_start, entry_address) |
37 | * char *new_name, *old_name; | |
d427b66a JB |
38 | * unsigned data_start, bss_start, entry_address; |
39 | * | |
40 | * Takes a snapshot of the program and makes an a.out format file in the | |
41 | * file named by the string argument new_name. | |
89b95605 RS |
42 | * If old_name is non-NULL, the symbol table will be taken from the given file. |
43 | * On some machines, an existing old_name file is required. | |
d427b66a JB |
44 | * |
45 | * The boundaries within the a.out file may be adjusted with the data_start | |
46 | * and bss_start arguments. Either or both may be given as 0 for defaults. | |
47 | * | |
48 | * Data_start gives the boundary between the text segment and the data | |
49 | * segment of the program. The text segment can contain shared, read-only | |
50 | * program code and literal data, while the data segment is always unshared | |
51 | * and unprotected. Data_start gives the lowest unprotected address. | |
52 | * The value you specify may be rounded down to a suitable boundary | |
53 | * as required by the machine you are using. | |
54 | * | |
d427b66a JB |
55 | * Bss_start indicates how much of the data segment is to be saved in the |
56 | * a.out file and restored when the program is executed. It gives the lowest | |
57 | * unsaved address, and is rounded up to a page boundary. The default when 0 | |
58 | * is given assumes that the entire data segment is to be stored, including | |
59 | * the previous data and bss as well as any additional storage allocated with | |
60 | * break (2). | |
61 | * | |
62 | * The new file is set up to start at entry_address. | |
63 | * | |
d427b66a JB |
64 | */ |
65 | ||
66 | /* Even more heavily modified by james@bigtex.cactus.org of Dell Computer Co. | |
67 | * ELF support added. | |
68 | * | |
69 | * Basic theory: the data space of the running process needs to be | |
70 | * dumped to the output file. Normally we would just enlarge the size | |
71 | * of .data, scooting everything down. But we can't do that in ELF, | |
72 | * because there is often something between the .data space and the | |
73 | * .bss space. | |
74 | * | |
75 | * In the temacs dump below, notice that the Global Offset Table | |
76 | * (.got) and the Dynamic link data (.dynamic) come between .data1 and | |
77 | * .bss. It does not work to overlap .data with these fields. | |
78 | * | |
79 | * The solution is to create a new .data segment. This segment is | |
80 | * filled with data from the current process. Since the contents of | |
81 | * various sections refer to sections by index, the new .data segment | |
82 | * is made the last in the table to avoid changing any existing index. | |
83 | ||
84 | * This is an example of how the section headers are changed. "Addr" | |
85 | * is a process virtual address. "Offset" is a file offset. | |
86 | ||
87 | raid:/nfs/raid/src/dist-18.56/src> dump -h temacs | |
88 | ||
89 | temacs: | |
90 | ||
91 | **** SECTION HEADER TABLE **** | |
7da3d06f DL |
92 | [No] Type Flags Addr Offset Size Name |
93 | Link Info Adralgn Entsize | |
d427b66a | 94 | |
7da3d06f DL |
95 | [1] 1 2 0x80480d4 0xd4 0x13 .interp |
96 | 0 0 0x1 0 | |
d427b66a | 97 | |
7da3d06f DL |
98 | [2] 5 2 0x80480e8 0xe8 0x388 .hash |
99 | 3 0 0x4 0x4 | |
d427b66a | 100 | |
7da3d06f DL |
101 | [3] 11 2 0x8048470 0x470 0x7f0 .dynsym |
102 | 4 1 0x4 0x10 | |
d427b66a | 103 | |
7da3d06f DL |
104 | [4] 3 2 0x8048c60 0xc60 0x3ad .dynstr |
105 | 0 0 0x1 0 | |
d427b66a | 106 | |
7da3d06f DL |
107 | [5] 9 2 0x8049010 0x1010 0x338 .rel.plt |
108 | 3 7 0x4 0x8 | |
d427b66a | 109 | |
7da3d06f DL |
110 | [6] 1 6 0x8049348 0x1348 0x3 .init |
111 | 0 0 0x4 0 | |
d427b66a | 112 | |
7da3d06f DL |
113 | [7] 1 6 0x804934c 0x134c 0x680 .plt |
114 | 0 0 0x4 0x4 | |
d427b66a | 115 | |
7da3d06f DL |
116 | [8] 1 6 0x80499cc 0x19cc 0x3c56f .text |
117 | 0 0 0x4 0 | |
d427b66a | 118 | |
7da3d06f DL |
119 | [9] 1 6 0x8085f3c 0x3df3c 0x3 .fini |
120 | 0 0 0x4 0 | |
d427b66a | 121 | |
7da3d06f DL |
122 | [10] 1 2 0x8085f40 0x3df40 0x69c .rodata |
123 | 0 0 0x4 0 | |
d427b66a | 124 | |
7da3d06f DL |
125 | [11] 1 2 0x80865dc 0x3e5dc 0xd51 .rodata1 |
126 | 0 0 0x4 0 | |
d427b66a | 127 | |
7da3d06f DL |
128 | [12] 1 3 0x8088330 0x3f330 0x20afc .data |
129 | 0 0 0x4 0 | |
d427b66a | 130 | |
7da3d06f DL |
131 | [13] 1 3 0x80a8e2c 0x5fe2c 0x89d .data1 |
132 | 0 0 0x4 0 | |
d427b66a | 133 | |
7da3d06f DL |
134 | [14] 1 3 0x80a96cc 0x606cc 0x1a8 .got |
135 | 0 0 0x4 0x4 | |
d427b66a | 136 | |
7da3d06f DL |
137 | [15] 6 3 0x80a9874 0x60874 0x80 .dynamic |
138 | 4 0 0x4 0x8 | |
d427b66a | 139 | |
7da3d06f DL |
140 | [16] 8 3 0x80a98f4 0x608f4 0x449c .bss |
141 | 0 0 0x4 0 | |
d427b66a | 142 | |
7da3d06f DL |
143 | [17] 2 0 0 0x608f4 0x9b90 .symtab |
144 | 18 371 0x4 0x10 | |
d427b66a | 145 | |
7da3d06f DL |
146 | [18] 3 0 0 0x6a484 0x8526 .strtab |
147 | 0 0 0x1 0 | |
d427b66a | 148 | |
7da3d06f DL |
149 | [19] 3 0 0 0x729aa 0x93 .shstrtab |
150 | 0 0 0x1 0 | |
d427b66a | 151 | |
7da3d06f DL |
152 | [20] 1 0 0 0x72a3d 0x68b7 .comment |
153 | 0 0 0x1 0 | |
d427b66a | 154 | |
7da3d06f | 155 | raid:/nfs/raid/src/dist-18.56/src> dump -h xemacs |
d427b66a | 156 | |
7da3d06f | 157 | xemacs: |
d427b66a | 158 | |
7da3d06f DL |
159 | **** SECTION HEADER TABLE **** |
160 | [No] Type Flags Addr Offset Size Name | |
161 | Link Info Adralgn Entsize | |
d427b66a | 162 | |
7da3d06f DL |
163 | [1] 1 2 0x80480d4 0xd4 0x13 .interp |
164 | 0 0 0x1 0 | |
d427b66a | 165 | |
7da3d06f DL |
166 | [2] 5 2 0x80480e8 0xe8 0x388 .hash |
167 | 3 0 0x4 0x4 | |
d427b66a | 168 | |
7da3d06f DL |
169 | [3] 11 2 0x8048470 0x470 0x7f0 .dynsym |
170 | 4 1 0x4 0x10 | |
d427b66a | 171 | |
7da3d06f DL |
172 | [4] 3 2 0x8048c60 0xc60 0x3ad .dynstr |
173 | 0 0 0x1 0 | |
d427b66a | 174 | |
7da3d06f DL |
175 | [5] 9 2 0x8049010 0x1010 0x338 .rel.plt |
176 | 3 7 0x4 0x8 | |
d427b66a | 177 | |
7da3d06f DL |
178 | [6] 1 6 0x8049348 0x1348 0x3 .init |
179 | 0 0 0x4 0 | |
d427b66a | 180 | |
7da3d06f DL |
181 | [7] 1 6 0x804934c 0x134c 0x680 .plt |
182 | 0 0 0x4 0x4 | |
d427b66a | 183 | |
7da3d06f DL |
184 | [8] 1 6 0x80499cc 0x19cc 0x3c56f .text |
185 | 0 0 0x4 0 | |
d427b66a | 186 | |
7da3d06f DL |
187 | [9] 1 6 0x8085f3c 0x3df3c 0x3 .fini |
188 | 0 0 0x4 0 | |
d427b66a | 189 | |
7da3d06f DL |
190 | [10] 1 2 0x8085f40 0x3df40 0x69c .rodata |
191 | 0 0 0x4 0 | |
d427b66a | 192 | |
7da3d06f DL |
193 | [11] 1 2 0x80865dc 0x3e5dc 0xd51 .rodata1 |
194 | 0 0 0x4 0 | |
d427b66a | 195 | |
7da3d06f DL |
196 | [12] 1 3 0x8088330 0x3f330 0x20afc .data |
197 | 0 0 0x4 0 | |
d427b66a | 198 | |
7da3d06f DL |
199 | [13] 1 3 0x80a8e2c 0x5fe2c 0x89d .data1 |
200 | 0 0 0x4 0 | |
d427b66a | 201 | |
7da3d06f DL |
202 | [14] 1 3 0x80a96cc 0x606cc 0x1a8 .got |
203 | 0 0 0x4 0x4 | |
d427b66a | 204 | |
7da3d06f DL |
205 | [15] 6 3 0x80a9874 0x60874 0x80 .dynamic |
206 | 4 0 0x4 0x8 | |
d427b66a | 207 | |
7da3d06f DL |
208 | [16] 8 3 0x80c6800 0x7d800 0 .bss |
209 | 0 0 0x4 0 | |
d427b66a | 210 | |
7da3d06f DL |
211 | [17] 2 0 0 0x7d800 0x9b90 .symtab |
212 | 18 371 0x4 0x10 | |
d427b66a | 213 | |
7da3d06f DL |
214 | [18] 3 0 0 0x87390 0x8526 .strtab |
215 | 0 0 0x1 0 | |
d427b66a | 216 | |
7da3d06f DL |
217 | [19] 3 0 0 0x8f8b6 0x93 .shstrtab |
218 | 0 0 0x1 0 | |
d427b66a | 219 | |
7da3d06f DL |
220 | [20] 1 0 0 0x8f949 0x68b7 .comment |
221 | 0 0 0x1 0 | |
d427b66a | 222 | |
7da3d06f DL |
223 | [21] 1 3 0x80a98f4 0x608f4 0x1cf0c .data |
224 | 0 0 0x4 0 | |
d427b66a | 225 | |
7da3d06f DL |
226 | * This is an example of how the file header is changed. "Shoff" is |
227 | * the section header offset within the file. Since that table is | |
228 | * after the new .data section, it is moved. "Shnum" is the number of | |
229 | * sections, which we increment. | |
230 | * | |
231 | * "Phoff" is the file offset to the program header. "Phentsize" and | |
232 | * "Shentsz" are the program and section header entries sizes respectively. | |
233 | * These can be larger than the apparent struct sizes. | |
d427b66a | 234 | |
7da3d06f | 235 | raid:/nfs/raid/src/dist-18.56/src> dump -f temacs |
d427b66a | 236 | |
7da3d06f | 237 | temacs: |
d427b66a | 238 | |
7da3d06f DL |
239 | **** ELF HEADER **** |
240 | Class Data Type Machine Version | |
241 | Entry Phoff Shoff Flags Ehsize | |
242 | Phentsize Phnum Shentsz Shnum Shstrndx | |
d427b66a | 243 | |
7da3d06f DL |
244 | 1 1 2 3 1 |
245 | 0x80499cc 0x34 0x792f4 0 0x34 | |
246 | 0x20 5 0x28 21 19 | |
d427b66a | 247 | |
7da3d06f | 248 | raid:/nfs/raid/src/dist-18.56/src> dump -f xemacs |
d427b66a | 249 | |
7da3d06f | 250 | xemacs: |
d427b66a | 251 | |
7da3d06f DL |
252 | **** ELF HEADER **** |
253 | Class Data Type Machine Version | |
254 | Entry Phoff Shoff Flags Ehsize | |
255 | Phentsize Phnum Shentsz Shnum Shstrndx | |
d427b66a | 256 | |
7da3d06f DL |
257 | 1 1 2 3 1 |
258 | 0x80499cc 0x34 0x96200 0 0x34 | |
259 | 0x20 5 0x28 22 19 | |
d427b66a | 260 | |
7da3d06f DL |
261 | * These are the program headers. "Offset" is the file offset to the |
262 | * segment. "Vaddr" is the memory load address. "Filesz" is the | |
263 | * segment size as it appears in the file, and "Memsz" is the size in | |
264 | * memory. Below, the third segment is the code and the fourth is the | |
265 | * data: the difference between Filesz and Memsz is .bss | |
d427b66a | 266 | |
7da3d06f | 267 | raid:/nfs/raid/src/dist-18.56/src> dump -o temacs |
d427b66a | 268 | |
7da3d06f DL |
269 | temacs: |
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 | 0x215c4 0x25a60 7 0x1000 | |
d427b66a | 285 | |
7da3d06f DL |
286 | 2 0x60874 0x80a9874 0 |
287 | 0x80 0 7 0 | |
d427b66a | 288 | |
7da3d06f | 289 | raid:/nfs/raid/src/dist-18.56/src> dump -o xemacs |
d427b66a | 290 | |
7da3d06f DL |
291 | xemacs: |
292 | ***** PROGRAM EXECUTION HEADER ***** | |
293 | Type Offset Vaddr Paddr | |
294 | Filesz Memsz Flags Align | |
d427b66a | 295 | |
7da3d06f DL |
296 | 6 0x34 0x8048034 0 |
297 | 0xa0 0xa0 5 0 | |
d427b66a | 298 | |
7da3d06f DL |
299 | 3 0xd4 0 0 |
300 | 0x13 0 4 0 | |
d427b66a | 301 | |
7da3d06f DL |
302 | 1 0x34 0x8048034 0 |
303 | 0x3f2f9 0x3f2f9 5 0x1000 | |
d427b66a | 304 | |
7da3d06f DL |
305 | 1 0x3f330 0x8088330 0 |
306 | 0x3e4d0 0x3e4d0 7 0x1000 | |
d427b66a | 307 | |
7da3d06f DL |
308 | 2 0x60874 0x80a9874 0 |
309 | 0x80 0 7 0 | |
d427b66a JB |
310 | |
311 | ||
312 | */ | |
e40c4104 | 313 | \f |
994a65f3 RM |
314 | /* Modified by wtien@urbana.mcd.mot.com of Motorola Inc. |
315 | * | |
e40c4104 | 316 | * The above mechanism does not work if the unexeced ELF file is being |
994a65f3 | 317 | * re-layout by other applications (such as `strip'). All the applications |
e40c4104 | 318 | * that re-layout the internal of ELF will layout all sections in ascending |
994a65f3 RM |
319 | * order of their file offsets. After the re-layout, the data2 section will |
320 | * still be the LAST section in the section header vector, but its file offset | |
e40c4104 | 321 | * is now being pushed far away down, and causes part of it not to be mapped |
994a65f3 | 322 | * in (ie. not covered by the load segment entry in PHDR vector), therefore |
e40c4104 RS |
323 | * causes the new binary to fail. |
324 | * | |
325 | * The solution is to modify the unexec algorithm to insert the new data2 | |
326 | * section header right before the new bss section header, so their file | |
994a65f3 RM |
327 | * offsets will be in the ascending order. Since some of the section's (all |
328 | * sections AFTER the bss section) indexes are now changed, we also need to | |
329 | * modify some fields to make them point to the right sections. This is done | |
e40c4104 | 330 | * by macro PATCH_INDEX. All the fields that need to be patched are: |
994a65f3 | 331 | * |
e40c4104 RS |
332 | * 1. ELF header e_shstrndx field. |
333 | * 2. section header sh_link and sh_info field. | |
334 | * 3. symbol table entry st_shndx field. | |
335 | * | |
336 | * The above example now should look like: | |
337 | ||
338 | **** SECTION HEADER TABLE **** | |
7da3d06f DL |
339 | [No] Type Flags Addr Offset Size Name |
340 | Link Info Adralgn Entsize | |
e40c4104 | 341 | |
7da3d06f DL |
342 | [1] 1 2 0x80480d4 0xd4 0x13 .interp |
343 | 0 0 0x1 0 | |
d427b66a | 344 | |
7da3d06f DL |
345 | [2] 5 2 0x80480e8 0xe8 0x388 .hash |
346 | 3 0 0x4 0x4 | |
e40c4104 | 347 | |
7da3d06f DL |
348 | [3] 11 2 0x8048470 0x470 0x7f0 .dynsym |
349 | 4 1 0x4 0x10 | |
e40c4104 | 350 | |
7da3d06f DL |
351 | [4] 3 2 0x8048c60 0xc60 0x3ad .dynstr |
352 | 0 0 0x1 0 | |
e40c4104 | 353 | |
7da3d06f DL |
354 | [5] 9 2 0x8049010 0x1010 0x338 .rel.plt |
355 | 3 7 0x4 0x8 | |
e40c4104 | 356 | |
7da3d06f DL |
357 | [6] 1 6 0x8049348 0x1348 0x3 .init |
358 | 0 0 0x4 0 | |
e40c4104 | 359 | |
7da3d06f DL |
360 | [7] 1 6 0x804934c 0x134c 0x680 .plt |
361 | 0 0 0x4 0x4 | |
e40c4104 | 362 | |
7da3d06f DL |
363 | [8] 1 6 0x80499cc 0x19cc 0x3c56f .text |
364 | 0 0 0x4 0 | |
e40c4104 | 365 | |
7da3d06f DL |
366 | [9] 1 6 0x8085f3c 0x3df3c 0x3 .fini |
367 | 0 0 0x4 0 | |
e40c4104 | 368 | |
7da3d06f DL |
369 | [10] 1 2 0x8085f40 0x3df40 0x69c .rodata |
370 | 0 0 0x4 0 | |
e40c4104 | 371 | |
7da3d06f DL |
372 | [11] 1 2 0x80865dc 0x3e5dc 0xd51 .rodata1 |
373 | 0 0 0x4 0 | |
e40c4104 | 374 | |
7da3d06f DL |
375 | [12] 1 3 0x8088330 0x3f330 0x20afc .data |
376 | 0 0 0x4 0 | |
e40c4104 | 377 | |
7da3d06f DL |
378 | [13] 1 3 0x80a8e2c 0x5fe2c 0x89d .data1 |
379 | 0 0 0x4 0 | |
e40c4104 | 380 | |
7da3d06f DL |
381 | [14] 1 3 0x80a96cc 0x606cc 0x1a8 .got |
382 | 0 0 0x4 0x4 | |
e40c4104 | 383 | |
7da3d06f DL |
384 | [15] 6 3 0x80a9874 0x60874 0x80 .dynamic |
385 | 4 0 0x4 0x8 | |
e40c4104 | 386 | |
7da3d06f DL |
387 | [16] 1 3 0x80a98f4 0x608f4 0x1cf0c .data |
388 | 0 0 0x4 0 | |
e40c4104 | 389 | |
7da3d06f DL |
390 | [17] 8 3 0x80c6800 0x7d800 0 .bss |
391 | 0 0 0x4 0 | |
e40c4104 | 392 | |
7da3d06f DL |
393 | [18] 2 0 0 0x7d800 0x9b90 .symtab |
394 | 19 371 0x4 0x10 | |
e40c4104 | 395 | |
7da3d06f DL |
396 | [19] 3 0 0 0x87390 0x8526 .strtab |
397 | 0 0 0x1 0 | |
e40c4104 | 398 | |
7da3d06f DL |
399 | [20] 3 0 0 0x8f8b6 0x93 .shstrtab |
400 | 0 0 0x1 0 | |
e40c4104 | 401 | |
7da3d06f DL |
402 | [21] 1 0 0 0x8f949 0x68b7 .comment |
403 | 0 0 0x1 0 | |
e40c4104 RS |
404 | |
405 | */ | |
406 | \f | |
d9d54213 RS |
407 | /* We do not use mmap because that fails with NFS. |
408 | Instead we read the whole file, modify it, and write it out. */ | |
409 | ||
1b963cdd DL |
410 | #ifndef emacs |
411 | #define fatal(a, b, c) fprintf (stderr, a, b, c), exit (1) | |
6b7d4ae4 | 412 | #include <string.h> |
1b963cdd DL |
413 | #else |
414 | #include <config.h> | |
415 | extern void fatal (char *, ...); | |
416 | #endif | |
417 | ||
d427b66a JB |
418 | #include <sys/types.h> |
419 | #include <stdio.h> | |
420 | #include <sys/stat.h> | |
421 | #include <memory.h> | |
d427b66a JB |
422 | #include <errno.h> |
423 | #include <unistd.h> | |
424 | #include <fcntl.h> | |
cb1ee811 | 425 | #if !defined (__NetBSD__) && !defined (__OpenBSD__) |
d427b66a | 426 | #include <elf.h> |
e5d0f709 | 427 | #endif |
d427b66a | 428 | #include <sys/mman.h> |
9240b21d RS |
429 | #if defined (__sony_news) && defined (_SYSTYPE_SYSV) |
430 | #include <sys/elf_mips.h> | |
431 | #include <sym.h> | |
432 | #endif /* __sony_news && _SYSTYPE_SYSV */ | |
bc597cc7 | 433 | #if __sgi |
52da6a59 | 434 | #include <syms.h> /* for HDRR declaration */ |
bc597cc7 | 435 | #endif /* __sgi */ |
4dbcac31 | 436 | |
aff37336 SS |
437 | #ifndef MAP_ANON |
438 | #ifdef MAP_ANONYMOUS | |
439 | #define MAP_ANON MAP_ANONYMOUS | |
440 | #else | |
441 | #define MAP_ANON 0 | |
442 | #endif | |
443 | #endif | |
444 | ||
445 | #ifndef MAP_FAILED | |
446 | #define MAP_FAILED ((void *) -1) | |
447 | #endif | |
448 | ||
cb1ee811 | 449 | #if defined (__alpha__) && !defined (__NetBSD__) && !defined (__OpenBSD__) |
eabb24d0 RS |
450 | /* Declare COFF debugging symbol table. This used to be in |
451 | /usr/include/sym.h, but this file is no longer included in Red Hat | |
452 | 5.0 and presumably in any other glibc 2.x based distribution. */ | |
453 | typedef struct { | |
454 | short magic; | |
455 | short vstamp; | |
456 | int ilineMax; | |
457 | int idnMax; | |
458 | int ipdMax; | |
459 | int isymMax; | |
460 | int ioptMax; | |
461 | int iauxMax; | |
462 | int issMax; | |
463 | int issExtMax; | |
464 | int ifdMax; | |
465 | int crfd; | |
466 | int iextMax; | |
467 | long cbLine; | |
468 | long cbLineOffset; | |
469 | long cbDnOffset; | |
470 | long cbPdOffset; | |
471 | long cbSymOffset; | |
472 | long cbOptOffset; | |
473 | long cbAuxOffset; | |
474 | long cbSsOffset; | |
475 | long cbSsExtOffset; | |
476 | long cbFdOffset; | |
477 | long cbRfdOffset; | |
478 | long cbExtOffset; | |
7da3d06f | 479 | } HDRR, *pHDRR; |
eabb24d0 RS |
480 | #define cbHDRR sizeof(HDRR) |
481 | #define hdrNil ((pHDRR)0) | |
265b2695 RS |
482 | #endif |
483 | ||
e5d0f709 RS |
484 | #ifdef __NetBSD__ |
485 | /* | |
486 | * NetBSD does not have normal-looking user-land ELF support. | |
487 | */ | |
3af5762e | 488 | # if defined __alpha__ || defined __sparc_v9__ |
e5d0f709 RS |
489 | # define ELFSIZE 64 |
490 | # else | |
491 | # define ELFSIZE 32 | |
492 | # endif | |
493 | # include <sys/exec_elf.h> | |
494 | ||
0007072a KR |
495 | # ifndef PT_LOAD |
496 | # define PT_LOAD Elf_pt_load | |
f4db570c GM |
497 | # if 0 /* was in pkgsrc patches for 20.7 */ |
498 | # define SHT_PROGBITS Elf_sht_progbits | |
499 | # endif | |
0007072a KR |
500 | # define SHT_SYMTAB Elf_sht_symtab |
501 | # define SHT_DYNSYM Elf_sht_dynsym | |
502 | # define SHT_NULL Elf_sht_null | |
503 | # define SHT_NOBITS Elf_sht_nobits | |
504 | # define SHT_REL Elf_sht_rel | |
505 | # define SHT_RELA Elf_sht_rela | |
506 | ||
507 | # define SHN_UNDEF Elf_eshn_undefined | |
508 | # define SHN_ABS Elf_eshn_absolute | |
509 | # define SHN_COMMON Elf_eshn_common | |
f4db570c | 510 | # endif /* !PT_LOAD */ |
e5d0f709 | 511 | |
e5d0f709 RS |
512 | # ifdef __alpha__ |
513 | # include <sys/exec_ecoff.h> | |
514 | # define HDRR struct ecoff_symhdr | |
515 | # define pHDRR HDRR * | |
f4db570c | 516 | # endif /* __alpha__ */ |
e5d0f709 | 517 | |
6b7d4ae4 | 518 | #ifdef __mips__ /* was in pkgsrc patches for 20.7 */ |
f4db570c GM |
519 | # define SHT_MIPS_DEBUG DT_MIPS_FLAGS |
520 | # define HDRR struct Elf_Shdr | |
521 | #endif /* __mips__ */ | |
6b7d4ae4 | 522 | #endif /* __NetBSD__ */ |
f4db570c | 523 | |
cb1ee811 RS |
524 | #ifdef __OpenBSD__ |
525 | # include <sys/exec_elf.h> | |
526 | #endif | |
527 | ||
265b2695 RS |
528 | #if __GNU_LIBRARY__ - 0 >= 6 |
529 | # include <link.h> /* get ElfW etc */ | |
530 | #endif | |
531 | ||
532 | #ifndef ElfW | |
533 | # ifdef __STDC__ | |
1b963cdd | 534 | # define ElfBitsW(bits, type) Elf##bits##_##type |
68c45bf0 | 535 | # else |
1b963cdd | 536 | # define ElfBitsW(bits, type) Elf/**/bits/**/_/**/type |
68c45bf0 | 537 | # endif |
1b963cdd DL |
538 | # ifdef _LP64 |
539 | # define ELFSIZE 64 | |
540 | # else | |
541 | # define ELFSIZE 32 | |
542 | # endif | |
543 | /* This macro expands `bits' before invoking ElfBitsW. */ | |
544 | # define ElfExpandBitsW(bits, type) ElfBitsW (bits, type) | |
545 | # define ElfW(type) ElfExpandBitsW (ELFSIZE, type) | |
d427b66a JB |
546 | #endif |
547 | ||
d8858cfe RS |
548 | #ifndef ELF_BSS_SECTION_NAME |
549 | #define ELF_BSS_SECTION_NAME ".bss" | |
550 | #endif | |
551 | ||
d427b66a JB |
552 | /* Get the address of a particular section or program header entry, |
553 | * accounting for the size of the entries. | |
554 | */ | |
bc597cc7 | 555 | /* |
ea083293 RS |
556 | On PPC Reference Platform running Solaris 2.5.1 |
557 | the plt section is also of type NOBI like the bss section. | |
558 | (not really stored) and therefore sections after the bss | |
559 | section start at the plt offset. The plt section is always | |
560 | the one just before the bss section. | |
561 | Thus, we modify the test from | |
562 | if (NEW_SECTION_H (nn).sh_offset >= new_data2_offset) | |
563 | to | |
bc597cc7 | 564 | if (NEW_SECTION_H (nn).sh_offset >= |
ea083293 RS |
565 | OLD_SECTION_H (old_bss_index-1).sh_offset) |
566 | This is just a hack. We should put the new data section | |
567 | before the .plt section. | |
568 | And we should not have this routine at all but use | |
569 | the libelf library to read the old file and create the new | |
570 | file. | |
571 | The changed code is minimal and depends on prep set in m/prep.h | |
572 | Erik Deumens | |
573 | Quantum Theory Project | |
574 | University of Florida | |
575 | deumens@qtp.ufl.edu | |
576 | Apr 23, 1996 | |
577 | */ | |
d427b66a JB |
578 | |
579 | #define OLD_SECTION_H(n) \ | |
265b2695 | 580 | (*(ElfW(Shdr) *) ((byte *) old_section_h + old_file_h->e_shentsize * (n))) |
d427b66a | 581 | #define NEW_SECTION_H(n) \ |
265b2695 | 582 | (*(ElfW(Shdr) *) ((byte *) new_section_h + new_file_h->e_shentsize * (n))) |
d427b66a | 583 | #define OLD_PROGRAM_H(n) \ |
265b2695 | 584 | (*(ElfW(Phdr) *) ((byte *) old_program_h + old_file_h->e_phentsize * (n))) |
d427b66a | 585 | #define NEW_PROGRAM_H(n) \ |
265b2695 | 586 | (*(ElfW(Phdr) *) ((byte *) new_program_h + new_file_h->e_phentsize * (n))) |
d427b66a | 587 | |
e40c4104 RS |
588 | #define PATCH_INDEX(n) \ |
589 | do { \ | |
d7cb42c3 | 590 | if ((int) (n) >= old_bss_index) \ |
e40c4104 | 591 | (n)++; } while (0) |
d427b66a JB |
592 | typedef unsigned char byte; |
593 | ||
e40c4104 RS |
594 | /* Round X up to a multiple of Y. */ |
595 | ||
bc597cc7 | 596 | static ElfW(Addr) |
e40c4104 | 597 | round_up (x, y) |
4461bfd3 | 598 | ElfW(Addr) x, y; |
e40c4104 RS |
599 | { |
600 | int rem = x % y; | |
601 | if (rem == 0) | |
602 | return x; | |
603 | return x - rem + y; | |
604 | } | |
605 | ||
52da6a59 GM |
606 | /* Return the index of the section named NAME. |
607 | SECTION_NAMES, FILE_NAME and FILE_H give information | |
608 | about the file we are looking in. | |
609 | ||
610 | If we don't find the section NAME, that is a fatal error | |
611 | if NOERROR is 0; we return -1 if NOERROR is nonzero. */ | |
612 | ||
613 | static int | |
614 | find_section (name, section_names, file_name, old_file_h, old_section_h, noerror) | |
615 | char *name; | |
616 | char *section_names; | |
617 | char *file_name; | |
618 | ElfW(Ehdr) *old_file_h; | |
619 | ElfW(Shdr) *old_section_h; | |
620 | int noerror; | |
621 | { | |
622 | int idx; | |
623 | ||
624 | for (idx = 1; idx < old_file_h->e_shnum; idx++) | |
625 | { | |
626 | #ifdef DEBUG | |
627 | fprintf (stderr, "Looking for %s - found %s\n", name, | |
628 | section_names + OLD_SECTION_H (idx).sh_name); | |
629 | #endif | |
630 | if (!strcmp (section_names + OLD_SECTION_H (idx).sh_name, | |
631 | name)) | |
632 | break; | |
633 | } | |
634 | if (idx == old_file_h->e_shnum) | |
635 | { | |
636 | if (noerror) | |
637 | return -1; | |
638 | else | |
f4db570c | 639 | fatal ("Can't find %s in %s.\n", name, file_name); |
52da6a59 GM |
640 | } |
641 | ||
642 | return idx; | |
643 | } | |
644 | ||
d427b66a JB |
645 | /* **************************************************************** |
646 | * unexec | |
647 | * | |
648 | * driving logic. | |
649 | * | |
650 | * In ELF, this works by replacing the old .bss section with a new | |
651 | * .data section, and inserting an empty .bss immediately afterwards. | |
652 | * | |
653 | */ | |
654 | void | |
655 | unexec (new_name, old_name, data_start, bss_start, entry_address) | |
656 | char *new_name, *old_name; | |
657 | unsigned data_start, bss_start, entry_address; | |
658 | { | |
d427b66a JB |
659 | int new_file, old_file, new_file_size; |
660 | ||
d9d54213 | 661 | /* Pointers to the base of the image of the two files. */ |
d427b66a JB |
662 | caddr_t old_base, new_base; |
663 | ||
aff37336 SS |
664 | #if MAP_ANON == 0 |
665 | int mmap_fd; | |
666 | #else | |
667 | # define mmap_fd -1 | |
668 | #endif | |
669 | ||
d9d54213 RS |
670 | /* Pointers to the file, program and section headers for the old and |
671 | new files. */ | |
265b2695 RS |
672 | ElfW(Ehdr) *old_file_h, *new_file_h; |
673 | ElfW(Phdr) *old_program_h, *new_program_h; | |
674 | ElfW(Shdr) *old_section_h, *new_section_h; | |
d427b66a | 675 | |
d9d54213 | 676 | /* Point to the section name table in the old file. */ |
d427b66a JB |
677 | char *old_section_names; |
678 | ||
265b2695 RS |
679 | ElfW(Addr) old_bss_addr, new_bss_addr; |
680 | ElfW(Word) old_bss_size, new_data2_size; | |
681 | ElfW(Off) new_data2_offset; | |
682 | ElfW(Addr) new_data2_addr; | |
d427b66a | 683 | |
52da6a59 GM |
684 | int n, nn; |
685 | int old_bss_index, old_sbss_index; | |
686 | int old_data_index, new_data2_index; | |
687 | int old_mdebug_index; | |
d427b66a | 688 | struct stat stat_buf; |
86928dfb | 689 | int old_file_size; |
d427b66a | 690 | |
6fb8339c | 691 | /* Open the old file, allocate a buffer of the right size, and read |
d9d54213 | 692 | in the file contents. */ |
d427b66a JB |
693 | |
694 | old_file = open (old_name, O_RDONLY); | |
695 | ||
696 | if (old_file < 0) | |
697 | fatal ("Can't open %s for reading: errno %d\n", old_name, errno); | |
698 | ||
699 | if (fstat (old_file, &stat_buf) == -1) | |
d7cb42c3 | 700 | fatal ("Can't fstat (%s): errno %d\n", old_name, errno); |
d427b66a | 701 | |
aff37336 SS |
702 | #if MAP_ANON == 0 |
703 | mmap_fd = open ("/dev/zero", O_RDONLY); | |
704 | if (mmap_fd < 0) | |
705 | fatal ("Can't open /dev/zero for reading: errno %d\n", errno); | |
706 | #endif | |
707 | ||
86928dfb GM |
708 | /* We cannot use malloc here because that may use sbrk. If it does, |
709 | we'd dump our temporary buffers with Emacs, and we'd have to be | |
710 | extra careful to use the correct value of sbrk(0) after | |
711 | allocating all buffers in the code below, which we aren't. */ | |
712 | old_file_size = stat_buf.st_size; | |
713 | old_base = mmap (NULL, old_file_size, PROT_READ | PROT_WRITE, | |
aff37336 SS |
714 | MAP_ANON | MAP_PRIVATE, mmap_fd, 0); |
715 | if (old_base == MAP_FAILED) | |
6fb8339c | 716 | fatal ("Can't allocate buffer for %s\n", old_name); |
d427b66a | 717 | |
6fb8339c EZ |
718 | if (read (old_file, old_base, stat_buf.st_size) != stat_buf.st_size) |
719 | fatal ("Didn't read all of %s: errno %d\n", old_name, errno); | |
720 | ||
d427b66a JB |
721 | /* Get pointers to headers & section names */ |
722 | ||
265b2695 RS |
723 | old_file_h = (ElfW(Ehdr) *) old_base; |
724 | old_program_h = (ElfW(Phdr) *) ((byte *) old_base + old_file_h->e_phoff); | |
725 | old_section_h = (ElfW(Shdr) *) ((byte *) old_base + old_file_h->e_shoff); | |
d427b66a | 726 | old_section_names = (char *) old_base |
d7cb42c3 | 727 | + OLD_SECTION_H (old_file_h->e_shstrndx).sh_offset; |
d427b66a | 728 | |
52da6a59 GM |
729 | /* Find the mdebug section, if any. */ |
730 | ||
731 | old_mdebug_index = find_section (".mdebug", old_section_names, | |
732 | old_name, old_file_h, old_section_h, 1); | |
733 | ||
d427b66a | 734 | /* Find the old .bss section. Figure out parameters of the new |
d9d54213 | 735 | data2 and bss sections. */ |
d427b66a | 736 | |
52da6a59 GM |
737 | old_bss_index = find_section (".bss", old_section_names, |
738 | old_name, old_file_h, old_section_h, 0); | |
d427b66a | 739 | |
52da6a59 GM |
740 | old_sbss_index = find_section (".sbss", old_section_names, |
741 | old_name, old_file_h, old_section_h, 1); | |
1b963cdd DL |
742 | if (old_sbss_index != -1) |
743 | if (OLD_SECTION_H (old_sbss_index).sh_type == SHT_PROGBITS) | |
744 | old_sbss_index = -1; | |
52da6a59 GM |
745 | |
746 | if (old_sbss_index == -1) | |
9240b21d | 747 | { |
52da6a59 GM |
748 | old_bss_addr = OLD_SECTION_H (old_bss_index).sh_addr; |
749 | old_bss_size = OLD_SECTION_H (old_bss_index).sh_size; | |
9240b21d RS |
750 | new_data2_index = old_bss_index; |
751 | } | |
752 | else | |
753 | { | |
52da6a59 GM |
754 | old_bss_addr = OLD_SECTION_H (old_sbss_index).sh_addr; |
755 | old_bss_size = OLD_SECTION_H (old_bss_index).sh_size | |
756 | + OLD_SECTION_H (old_sbss_index).sh_size; | |
9240b21d RS |
757 | new_data2_index = old_sbss_index; |
758 | } | |
759 | ||
52da6a59 GM |
760 | /* Find the old .data section. Figure out parameters of |
761 | the new data2 and bss sections. */ | |
762 | ||
763 | old_data_index = find_section (".data", old_section_names, | |
764 | old_name, old_file_h, old_section_h, 0); | |
bc597cc7 | 765 | |
cb1ee811 | 766 | #if defined (emacs) || !defined (DEBUG) |
265b2695 | 767 | new_bss_addr = (ElfW(Addr)) sbrk (0); |
d427b66a JB |
768 | #else |
769 | new_bss_addr = old_bss_addr + old_bss_size + 0x1234; | |
770 | #endif | |
771 | new_data2_addr = old_bss_addr; | |
772 | new_data2_size = new_bss_addr - old_bss_addr; | |
52da6a59 GM |
773 | new_data2_offset = OLD_SECTION_H (old_data_index).sh_offset + |
774 | (new_data2_addr - OLD_SECTION_H (old_data_index).sh_addr); | |
d427b66a JB |
775 | |
776 | #ifdef DEBUG | |
777 | fprintf (stderr, "old_bss_index %d\n", old_bss_index); | |
d283640e KH |
778 | fprintf (stderr, "old_bss_addr %x\n", old_bss_addr); |
779 | fprintf (stderr, "old_bss_size %x\n", old_bss_size); | |
780 | fprintf (stderr, "new_bss_addr %x\n", new_bss_addr); | |
781 | fprintf (stderr, "new_data2_addr %x\n", new_data2_addr); | |
782 | fprintf (stderr, "new_data2_size %x\n", new_data2_size); | |
783 | fprintf (stderr, "new_data2_offset %x\n", new_data2_offset); | |
d427b66a JB |
784 | #endif |
785 | ||
d283640e | 786 | if ((unsigned) new_bss_addr < (unsigned) old_bss_addr + old_bss_size) |
d427b66a JB |
787 | fatal (".bss shrank when undumping???\n", 0, 0); |
788 | ||
6fb8339c | 789 | /* Set the output file to the right size. Allocate a buffer to hold |
d9d54213 RS |
790 | the image of the new file. Set pointers to various interesting |
791 | objects. stat_buf still has old_file data. */ | |
d427b66a JB |
792 | |
793 | new_file = open (new_name, O_RDWR | O_CREAT, 0666); | |
794 | if (new_file < 0) | |
d7cb42c3 | 795 | fatal ("Can't creat (%s): errno %d\n", new_name, errno); |
d427b66a JB |
796 | |
797 | new_file_size = stat_buf.st_size + old_file_h->e_shentsize + new_data2_size; | |
798 | ||
799 | if (ftruncate (new_file, new_file_size)) | |
d7cb42c3 | 800 | fatal ("Can't ftruncate (%s): errno %d\n", new_name, errno); |
d427b66a | 801 | |
86928dfb | 802 | new_base = mmap (NULL, new_file_size, PROT_READ | PROT_WRITE, |
aff37336 SS |
803 | MAP_ANON | MAP_PRIVATE, mmap_fd, 0); |
804 | if (new_base == MAP_FAILED) | |
6fb8339c EZ |
805 | fatal ("Can't allocate buffer for %s\n", old_name); |
806 | ||
265b2695 RS |
807 | new_file_h = (ElfW(Ehdr) *) new_base; |
808 | new_program_h = (ElfW(Phdr) *) ((byte *) new_base + old_file_h->e_phoff); | |
809 | new_section_h = (ElfW(Shdr) *) | |
d427b66a JB |
810 | ((byte *) new_base + old_file_h->e_shoff + new_data2_size); |
811 | ||
812 | /* Make our new file, program and section headers as copies of the | |
d9d54213 | 813 | originals. */ |
d427b66a JB |
814 | |
815 | memcpy (new_file_h, old_file_h, old_file_h->e_ehsize); | |
816 | memcpy (new_program_h, old_program_h, | |
817 | old_file_h->e_phnum * old_file_h->e_phentsize); | |
e40c4104 RS |
818 | |
819 | /* Modify the e_shstrndx if necessary. */ | |
820 | PATCH_INDEX (new_file_h->e_shstrndx); | |
d427b66a JB |
821 | |
822 | /* Fix up file header. We'll add one section. Section header is | |
d9d54213 | 823 | further away now. */ |
d427b66a JB |
824 | |
825 | new_file_h->e_shoff += new_data2_size; | |
826 | new_file_h->e_shnum += 1; | |
827 | ||
828 | #ifdef DEBUG | |
d283640e | 829 | fprintf (stderr, "Old section offset %x\n", old_file_h->e_shoff); |
d427b66a | 830 | fprintf (stderr, "Old section count %d\n", old_file_h->e_shnum); |
d283640e | 831 | fprintf (stderr, "New section offset %x\n", new_file_h->e_shoff); |
d427b66a JB |
832 | fprintf (stderr, "New section count %d\n", new_file_h->e_shnum); |
833 | #endif | |
834 | ||
835 | /* Fix up a new program header. Extend the writable data segment so | |
d9d54213 RS |
836 | that the bss area is covered too. Find that segment by looking |
837 | for a segment that ends just before the .bss area. Make sure | |
838 | that no segments are above the new .data2. Put a loop at the end | |
839 | to adjust the offset and address of any segment that is above | |
840 | data2, just in case we decide to allow this later. */ | |
d427b66a JB |
841 | |
842 | for (n = new_file_h->e_phnum - 1; n >= 0; n--) | |
843 | { | |
e40c4104 | 844 | /* Compute maximum of all requirements for alignment of section. */ |
bc597cc7 | 845 | ElfW(Word) alignment = (NEW_PROGRAM_H (n)).p_align; |
e40c4104 RS |
846 | if ((OLD_SECTION_H (old_bss_index)).sh_addralign > alignment) |
847 | alignment = OLD_SECTION_H (old_bss_index).sh_addralign; | |
848 | ||
52da6a59 | 849 | #ifdef __sgi |
bc597cc7 KH |
850 | /* According to r02kar@x4u2.desy.de (Karsten Kuenne) |
851 | and oliva@gnu.org (Alexandre Oliva), on IRIX 5.2, we | |
852 | always get "Program segment above .bss" when dumping | |
853 | when the executable doesn't have an sbss section. */ | |
854 | if (old_sbss_index != -1) | |
52da6a59 | 855 | #endif /* __sgi */ |
9240b21d | 856 | if (NEW_PROGRAM_H (n).p_vaddr + NEW_PROGRAM_H (n).p_filesz |
bc597cc7 KH |
857 | > (old_sbss_index == -1 |
858 | ? old_bss_addr | |
859 | : round_up (old_bss_addr, alignment))) | |
860 | fatal ("Program segment above .bss in %s\n", old_name, 0); | |
d427b66a | 861 | |
d7cb42c3 | 862 | if (NEW_PROGRAM_H (n).p_type == PT_LOAD |
e40c4104 RS |
863 | && (round_up ((NEW_PROGRAM_H (n)).p_vaddr |
864 | + (NEW_PROGRAM_H (n)).p_filesz, | |
865 | alignment) | |
866 | == round_up (old_bss_addr, alignment))) | |
d427b66a JB |
867 | break; |
868 | } | |
869 | if (n < 0) | |
870 | fatal ("Couldn't find segment next to .bss in %s\n", old_name, 0); | |
871 | ||
c1937d6a AS |
872 | /* Make sure that the size includes any padding before the old .bss |
873 | section. */ | |
874 | NEW_PROGRAM_H (n).p_filesz = new_bss_addr - NEW_PROGRAM_H (n).p_vaddr; | |
d7cb42c3 | 875 | NEW_PROGRAM_H (n).p_memsz = NEW_PROGRAM_H (n).p_filesz; |
d427b66a JB |
876 | |
877 | #if 0 /* Maybe allow section after data2 - does this ever happen? */ | |
878 | for (n = new_file_h->e_phnum - 1; n >= 0; n--) | |
879 | { | |
d7cb42c3 RS |
880 | if (NEW_PROGRAM_H (n).p_vaddr |
881 | && NEW_PROGRAM_H (n).p_vaddr >= new_data2_addr) | |
882 | NEW_PROGRAM_H (n).p_vaddr += new_data2_size - old_bss_size; | |
d427b66a | 883 | |
d7cb42c3 RS |
884 | if (NEW_PROGRAM_H (n).p_offset >= new_data2_offset) |
885 | NEW_PROGRAM_H (n).p_offset += new_data2_size; | |
d427b66a JB |
886 | } |
887 | #endif | |
888 | ||
889 | /* Fix up section headers based on new .data2 section. Any section | |
d9d54213 RS |
890 | whose offset or virtual address is after the new .data2 section |
891 | gets its value adjusted. .bss size becomes zero and new address | |
892 | is set. data2 section header gets added by copying the existing | |
893 | .data header and modifying the offset, address and size. */ | |
d7cb42c3 | 894 | for (old_data_index = 1; old_data_index < (int) old_file_h->e_shnum; |
d427b66a | 895 | old_data_index++) |
d7cb42c3 | 896 | if (!strcmp (old_section_names + OLD_SECTION_H (old_data_index).sh_name, |
d427b66a JB |
897 | ".data")) |
898 | break; | |
899 | if (old_data_index == old_file_h->e_shnum) | |
900 | fatal ("Can't find .data in %s.\n", old_name, 0); | |
901 | ||
994a65f3 | 902 | /* Walk through all section headers, insert the new data2 section right |
e40c4104 | 903 | before the new bss section. */ |
d7cb42c3 | 904 | for (n = 1, nn = 1; n < (int) old_file_h->e_shnum; n++, nn++) |
d427b66a JB |
905 | { |
906 | caddr_t src; | |
9240b21d RS |
907 | /* If it is (s)bss section, insert the new data2 section before it. */ |
908 | /* new_data2_index is the index of either old_sbss or old_bss, that was | |
909 | chosen as a section for new_data2. */ | |
bc597cc7 | 910 | if (n == new_data2_index) |
e40c4104 RS |
911 | { |
912 | /* Steal the data section header for this data2 section. */ | |
d7cb42c3 | 913 | memcpy (&NEW_SECTION_H (nn), &OLD_SECTION_H (old_data_index), |
e40c4104 | 914 | new_file_h->e_shentsize); |
994a65f3 | 915 | |
d7cb42c3 RS |
916 | NEW_SECTION_H (nn).sh_addr = new_data2_addr; |
917 | NEW_SECTION_H (nn).sh_offset = new_data2_offset; | |
918 | NEW_SECTION_H (nn).sh_size = new_data2_size; | |
e40c4104 RS |
919 | /* Use the bss section's alignment. This will assure that the |
920 | new data2 section always be placed in the same spot as the old | |
921 | bss section by any other application. */ | |
d7cb42c3 | 922 | NEW_SECTION_H (nn).sh_addralign = OLD_SECTION_H (n).sh_addralign; |
e40c4104 RS |
923 | |
924 | /* Now copy over what we have in the memory now. */ | |
994a65f3 RM |
925 | memcpy (NEW_SECTION_H (nn).sh_offset + new_base, |
926 | (caddr_t) OLD_SECTION_H (n).sh_addr, | |
e40c4104 RS |
927 | new_data2_size); |
928 | nn++; | |
929 | } | |
994a65f3 RM |
930 | |
931 | memcpy (&NEW_SECTION_H (nn), &OLD_SECTION_H (n), | |
e40c4104 | 932 | old_file_h->e_shentsize); |
7da3d06f | 933 | |
9240b21d | 934 | if (n == old_bss_index |
9240b21d RS |
935 | /* The new bss and sbss section's size is zero, and its file offset |
936 | and virtual address should be off by NEW_DATA2_SIZE. */ | |
937 | || n == old_sbss_index | |
9240b21d | 938 | ) |
e40c4104 | 939 | { |
bc597cc7 KH |
940 | /* NN should be `old_s?bss_index + 1' at this point. */ |
941 | NEW_SECTION_H (nn).sh_offset = | |
942 | NEW_SECTION_H (new_data2_index).sh_offset + new_data2_size; | |
943 | NEW_SECTION_H (nn).sh_addr = | |
944 | NEW_SECTION_H (new_data2_index).sh_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 | { | |
953 | /* Any section that was original placed AFTER the bss | |
954 | section should now be off by NEW_DATA2_SIZE. */ | |
ea083293 RS |
955 | #ifdef SOLARIS_POWERPC |
956 | /* On PPC Reference Platform running Solaris 2.5.1 | |
957 | the plt section is also of type NOBI like the bss section. | |
958 | (not really stored) and therefore sections after the bss | |
959 | section start at the plt offset. The plt section is always | |
960 | the one just before the bss section. | |
961 | It would be better to put the new data section before | |
962 | the .plt section, or use libelf instead. | |
963 | Erik Deumens, deumens@qtp.ufl.edu. */ | |
964 | if (NEW_SECTION_H (nn).sh_offset | |
965 | >= OLD_SECTION_H (old_bss_index-1).sh_offset) | |
966 | NEW_SECTION_H (nn).sh_offset += new_data2_size; | |
967 | #else | |
52da6a59 | 968 | if (round_up (NEW_SECTION_H (nn).sh_offset, |
faee8ef0 | 969 | OLD_SECTION_H (old_bss_index).sh_addralign) |
52da6a59 | 970 | >= new_data2_offset) |
85b2e0ee | 971 | NEW_SECTION_H (nn).sh_offset += new_data2_size; |
ea083293 | 972 | #endif |
85b2e0ee RS |
973 | /* Any section that was originally placed after the section |
974 | header table should now be off by the size of one section | |
975 | header table entry. */ | |
976 | if (NEW_SECTION_H (nn).sh_offset > new_file_h->e_shoff) | |
977 | NEW_SECTION_H (nn).sh_offset += new_file_h->e_shentsize; | |
978 | } | |
979 | ||
e40c4104 | 980 | /* If any section hdr refers to the section after the new .data |
994a65f3 | 981 | section, make it refer to next one because we have inserted |
8917361f | 982 | a new section in between. */ |
994a65f3 | 983 | |
d7cb42c3 | 984 | PATCH_INDEX (NEW_SECTION_H (nn).sh_link); |
8917361f RS |
985 | /* For symbol tables, info is a symbol table index, |
986 | so don't change it. */ | |
987 | if (NEW_SECTION_H (nn).sh_type != SHT_SYMTAB | |
988 | && NEW_SECTION_H (nn).sh_type != SHT_DYNSYM) | |
989 | PATCH_INDEX (NEW_SECTION_H (nn).sh_info); | |
7da3d06f | 990 | |
1b963cdd DL |
991 | if (old_sbss_index != -1) |
992 | if (!strcmp (old_section_names + NEW_SECTION_H (nn).sh_name, ".sbss")) | |
993 | { | |
7da3d06f | 994 | NEW_SECTION_H (nn).sh_offset = |
1b963cdd DL |
995 | round_up (NEW_SECTION_H (nn).sh_offset, |
996 | NEW_SECTION_H (nn).sh_addralign); | |
997 | NEW_SECTION_H (nn).sh_type = SHT_PROGBITS; | |
998 | } | |
8917361f RS |
999 | |
1000 | /* Now, start to copy the content of sections. */ | |
d7cb42c3 RS |
1001 | if (NEW_SECTION_H (nn).sh_type == SHT_NULL |
1002 | || NEW_SECTION_H (nn).sh_type == SHT_NOBITS) | |
d427b66a | 1003 | continue; |
994a65f3 | 1004 | |
e40c4104 | 1005 | /* Write out the sections. .data and .data1 (and data2, called |
8917361f RS |
1006 | ".data" in the strings table) get copied from the current process |
1007 | instead of the old file. */ | |
d7cb42c3 | 1008 | if (!strcmp (old_section_names + NEW_SECTION_H (n).sh_name, ".data") |
9240b21d RS |
1009 | || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name), |
1010 | ".sdata") | |
1011 | || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name), | |
1012 | ".lit4") | |
1013 | || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name), | |
1014 | ".lit8") | |
d4e3d7f2 RS |
1015 | /* The conditional bit below was in Oliva's original code |
1016 | (1999-08-25) and seems to have been dropped by mistake | |
1017 | subsequently. It prevents a crash at startup under X in | |
7da3d06f DL |
1018 | `IRIX64 6.5 6.5.17m', whether compiled on that relase or |
1019 | an earlier one. It causes no trouble on the other ELF | |
1020 | platforms I could test (Irix 6.5.15m, Solaris 8, Debian | |
1021 | Potato x86, Debian Woody SPARC); however, it's reported | |
1022 | to cause crashes under some version of GNU/Linux. It's | |
1023 | not yet clear what's changed in that Irix version to | |
1024 | cause the problem, or why the fix sometimes fails under | |
1025 | GNU/Linux. There's probably no good reason to have | |
1026 | something Irix-specific here, but this will have to do | |
1027 | for now. IRIX6_5 is the most specific macro we have to | |
1028 | test. -- fx 2002-10-01 | |
1029 | ||
1030 | The issue _looks_ as though it's gone away on 6.5.18m, | |
1031 | but maybe it's still lurking, to be triggered by some | |
1032 | change in the binary. It appears to concern the dynamic | |
1033 | loader, but I never got anywhere with an SGI support call | |
1034 | seeking clues. -- fx 2002-11-29. */ | |
d4e3d7f2 RS |
1035 | #ifdef IRIX6_5 |
1036 | || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name), | |
1037 | ".got") | |
1038 | #endif | |
bc597cc7 KH |
1039 | || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name), |
1040 | ".sdata1") | |
d7cb42c3 | 1041 | || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name), |
1b963cdd | 1042 | ".data1") |
6108b49c | 1043 | || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name), |
1b963cdd | 1044 | ".sbss")) |
d7cb42c3 | 1045 | src = (caddr_t) OLD_SECTION_H (n).sh_addr; |
d427b66a | 1046 | else |
d7cb42c3 | 1047 | src = old_base + OLD_SECTION_H (n).sh_offset; |
994a65f3 | 1048 | |
d7cb42c3 RS |
1049 | memcpy (NEW_SECTION_H (nn).sh_offset + new_base, src, |
1050 | NEW_SECTION_H (nn).sh_size); | |
e40c4104 | 1051 | |
265b2695 RS |
1052 | #ifdef __alpha__ |
1053 | /* Update Alpha COFF symbol table: */ | |
1054 | if (strcmp (old_section_names + OLD_SECTION_H (n).sh_name, ".mdebug") | |
1055 | == 0) | |
1056 | { | |
1057 | pHDRR symhdr = (pHDRR) (NEW_SECTION_H (nn).sh_offset + new_base); | |
1058 | ||
1059 | symhdr->cbLineOffset += new_data2_size; | |
1060 | symhdr->cbDnOffset += new_data2_size; | |
1061 | symhdr->cbPdOffset += new_data2_size; | |
1062 | symhdr->cbSymOffset += new_data2_size; | |
1063 | symhdr->cbOptOffset += new_data2_size; | |
1064 | symhdr->cbAuxOffset += new_data2_size; | |
1065 | symhdr->cbSsOffset += new_data2_size; | |
1066 | symhdr->cbSsExtOffset += new_data2_size; | |
1067 | symhdr->cbFdOffset += new_data2_size; | |
1068 | symhdr->cbRfdOffset += new_data2_size; | |
1069 | symhdr->cbExtOffset += new_data2_size; | |
1070 | } | |
1071 | #endif /* __alpha__ */ | |
1072 | ||
9240b21d | 1073 | #if defined (__sony_news) && defined (_SYSTYPE_SYSV) |
52da6a59 | 1074 | if (NEW_SECTION_H (nn).sh_type == SHT_MIPS_DEBUG |
7da3d06f | 1075 | && old_mdebug_index != -1) |
9240b21d | 1076 | { |
7da3d06f | 1077 | int diff = NEW_SECTION_H(nn).sh_offset |
9240b21d RS |
1078 | - OLD_SECTION_H(old_mdebug_index).sh_offset; |
1079 | HDRR *phdr = (HDRR *)(NEW_SECTION_H (nn).sh_offset + new_base); | |
1080 | ||
1081 | if (diff) | |
1082 | { | |
1083 | phdr->cbLineOffset += diff; | |
1084 | phdr->cbDnOffset += diff; | |
1085 | phdr->cbPdOffset += diff; | |
1086 | phdr->cbSymOffset += diff; | |
1087 | phdr->cbOptOffset += diff; | |
1088 | phdr->cbAuxOffset += diff; | |
1089 | phdr->cbSsOffset += diff; | |
1090 | phdr->cbSsExtOffset += diff; | |
1091 | phdr->cbFdOffset += diff; | |
1092 | phdr->cbRfdOffset += diff; | |
1093 | phdr->cbExtOffset += diff; | |
1094 | } | |
1095 | } | |
1096 | #endif /* __sony_news && _SYSTYPE_SYSV */ | |
bc597cc7 KH |
1097 | |
1098 | #if __sgi | |
7da3d06f | 1099 | /* Adjust the HDRR offsets in .mdebug and copy the |
bc597cc7 KH |
1100 | line data if it's in its usual 'hole' in the object. |
1101 | Makes the new file debuggable with dbx. | |
1102 | patches up two problems: the absolute file offsets | |
1103 | in the HDRR record of .mdebug (see /usr/include/syms.h), and | |
1104 | the ld bug that gets the line table in a hole in the | |
1105 | elf file rather than in the .mdebug section proper. | |
1106 | David Anderson. davea@sgi.com Jan 16,1994. */ | |
1107 | if (n == old_mdebug_index) | |
1108 | { | |
1109 | #define MDEBUGADJUST(__ct,__fileaddr) \ | |
1110 | if (n_phdrr->__ct > 0) \ | |
1111 | { \ | |
1112 | n_phdrr->__fileaddr += movement; \ | |
1113 | } | |
1114 | ||
1115 | HDRR * o_phdrr = (HDRR *)((byte *)old_base + OLD_SECTION_H (n).sh_offset); | |
1116 | HDRR * n_phdrr = (HDRR *)((byte *)new_base + NEW_SECTION_H (nn).sh_offset); | |
1117 | unsigned movement = new_data2_size; | |
1118 | ||
1119 | MDEBUGADJUST (idnMax, cbDnOffset); | |
1120 | MDEBUGADJUST (ipdMax, cbPdOffset); | |
1121 | MDEBUGADJUST (isymMax, cbSymOffset); | |
1122 | MDEBUGADJUST (ioptMax, cbOptOffset); | |
1123 | MDEBUGADJUST (iauxMax, cbAuxOffset); | |
1124 | MDEBUGADJUST (issMax, cbSsOffset); | |
1125 | MDEBUGADJUST (issExtMax, cbSsExtOffset); | |
1126 | MDEBUGADJUST (ifdMax, cbFdOffset); | |
1127 | MDEBUGADJUST (crfd, cbRfdOffset); | |
1128 | MDEBUGADJUST (iextMax, cbExtOffset); | |
1129 | /* The Line Section, being possible off in a hole of the object, | |
1130 | requires special handling. */ | |
1131 | if (n_phdrr->cbLine > 0) | |
1132 | { | |
1133 | if (o_phdrr->cbLineOffset > (OLD_SECTION_H (n).sh_offset | |
1134 | + OLD_SECTION_H (n).sh_size)) | |
1135 | { | |
1136 | /* line data is in a hole in elf. do special copy and adjust | |
1137 | for this ld mistake. | |
1138 | */ | |
1139 | n_phdrr->cbLineOffset += movement; | |
1140 | ||
1141 | memcpy (n_phdrr->cbLineOffset + new_base, | |
1142 | o_phdrr->cbLineOffset + old_base, n_phdrr->cbLine); | |
1143 | } | |
1144 | else | |
1145 | { | |
1146 | /* somehow line data is in .mdebug as it is supposed to be. */ | |
1147 | MDEBUGADJUST (cbLine, cbLineOffset); | |
1148 | } | |
1149 | } | |
1150 | } | |
1151 | #endif /* __sgi */ | |
1152 | ||
8917361f | 1153 | /* If it is the symbol table, its st_shndx field needs to be patched. */ |
d7cb42c3 RS |
1154 | if (NEW_SECTION_H (nn).sh_type == SHT_SYMTAB |
1155 | || NEW_SECTION_H (nn).sh_type == SHT_DYNSYM) | |
e40c4104 | 1156 | { |
265b2695 | 1157 | ElfW(Shdr) *spt = &NEW_SECTION_H (nn); |
e40c4104 | 1158 | unsigned int num = spt->sh_size / spt->sh_entsize; |
265b2695 | 1159 | ElfW(Sym) * sym = (ElfW(Sym) *) (NEW_SECTION_H (nn).sh_offset + |
e40c4104 RS |
1160 | new_base); |
1161 | for (; num--; sym++) | |
1162 | { | |
1163 | if ((sym->st_shndx == SHN_UNDEF) | |
1164 | || (sym->st_shndx == SHN_ABS) | |
1165 | || (sym->st_shndx == SHN_COMMON)) | |
1166 | continue; | |
994a65f3 | 1167 | |
d7cb42c3 | 1168 | PATCH_INDEX (sym->st_shndx); |
e40c4104 RS |
1169 | } |
1170 | } | |
d427b66a JB |
1171 | } |
1172 | ||
8917361f | 1173 | /* Update the symbol values of _edata and _end. */ |
8bf761ce RS |
1174 | for (n = new_file_h->e_shnum - 1; n; n--) |
1175 | { | |
1176 | byte *symnames; | |
265b2695 | 1177 | ElfW(Sym) *symp, *symendp; |
8bf761ce RS |
1178 | |
1179 | if (NEW_SECTION_H (n).sh_type != SHT_DYNSYM | |
1180 | && NEW_SECTION_H (n).sh_type != SHT_SYMTAB) | |
1181 | continue; | |
1182 | ||
8c1e9afe KH |
1183 | symnames = ((byte *) new_base |
1184 | + NEW_SECTION_H (NEW_SECTION_H (n).sh_link).sh_offset); | |
265b2695 RS |
1185 | symp = (ElfW(Sym) *) (NEW_SECTION_H (n).sh_offset + new_base); |
1186 | symendp = (ElfW(Sym) *) ((byte *)symp + NEW_SECTION_H (n).sh_size); | |
8bf761ce RS |
1187 | |
1188 | for (; symp < symendp; symp ++) | |
1189 | if (strcmp ((char *) (symnames + symp->st_name), "_end") == 0 | |
2e1ddb87 RS |
1190 | || strcmp ((char *) (symnames + symp->st_name), "end") == 0 |
1191 | || strcmp ((char *) (symnames + symp->st_name), "_edata") == 0 | |
1192 | || strcmp ((char *) (symnames + symp->st_name), "edata") == 0) | |
8bf761ce RS |
1193 | memcpy (&symp->st_value, &new_bss_addr, sizeof (new_bss_addr)); |
1194 | } | |
1195 | ||
48240339 KH |
1196 | /* This loop seeks out relocation sections for the data section, so |
1197 | that it can undo relocations performed by the runtime linker. */ | |
1198 | for (n = new_file_h->e_shnum - 1; n; n--) | |
1199 | { | |
265b2695 | 1200 | ElfW(Shdr) section = NEW_SECTION_H (n); |
642ffd98 RS |
1201 | |
1202 | /* Cause a compilation error if anyone uses n instead of nn below. */ | |
1203 | struct {int a;} n; | |
1e7b70b2 | 1204 | (void)n.a; /* Prevent `unused variable' warnings. */ |
642ffd98 | 1205 | |
7da3d06f | 1206 | switch (section.sh_type) |
642ffd98 RS |
1207 | { |
1208 | default: | |
1209 | break; | |
1210 | case SHT_REL: | |
1211 | case SHT_RELA: | |
1212 | /* This code handles two different size structs, but there should | |
1213 | be no harm in that provided that r_offset is always the first | |
1214 | member. */ | |
1215 | nn = section.sh_info; | |
1216 | if (!strcmp (old_section_names + NEW_SECTION_H (nn).sh_name, ".data") | |
1217 | || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name), | |
1218 | ".sdata") | |
1219 | || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name), | |
1220 | ".lit4") | |
1221 | || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name), | |
1222 | ".lit8") | |
d4e3d7f2 RS |
1223 | #ifdef IRIX6_5 /* see above */ |
1224 | || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name), | |
1225 | ".got") | |
1226 | #endif | |
642ffd98 RS |
1227 | || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name), |
1228 | ".sdata1") | |
1229 | || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name), | |
1230 | ".data1")) | |
1231 | { | |
1232 | ElfW(Addr) offset = (NEW_SECTION_H (nn).sh_addr | |
1233 | - NEW_SECTION_H (nn).sh_offset); | |
1234 | caddr_t reloc = old_base + section.sh_offset, end; | |
1235 | for (end = reloc + section.sh_size; reloc < end; | |
1236 | reloc += section.sh_entsize) | |
1237 | { | |
1238 | ElfW(Addr) addr = ((ElfW(Rel) *) reloc)->r_offset - offset; | |
265b2695 | 1239 | #ifdef __alpha__ |
642ffd98 RS |
1240 | /* The Alpha ELF binutils currently have a bug that |
1241 | sometimes results in relocs that contain all | |
1242 | zeroes. Work around this for now... */ | |
1243 | if (((ElfW(Rel) *) reloc)->r_offset == 0) | |
265b2695 RS |
1244 | continue; |
1245 | #endif | |
642ffd98 RS |
1246 | memcpy (new_base + addr, old_base + addr, sizeof(ElfW(Addr))); |
1247 | } | |
1248 | } | |
1249 | break; | |
1250 | } | |
48240339 | 1251 | } |
48240339 | 1252 | |
d9d54213 | 1253 | /* Write out new_file, and free the buffers. */ |
04f903c0 KH |
1254 | |
1255 | if (write (new_file, new_base, new_file_size) != new_file_size) | |
7da3d06f | 1256 | fatal ("Didn't write %d bytes to %s: errno %d\n", |
6fb8339c EZ |
1257 | new_file_size, new_base, errno); |
1258 | ||
86928dfb GM |
1259 | munmap (old_base, old_file_size); |
1260 | munmap (new_base, new_file_size); | |
6fb8339c | 1261 | |
d9d54213 | 1262 | /* Close the files and make the new file executable. */ |
d427b66a | 1263 | |
aff37336 SS |
1264 | #if MAP_ANON == 0 |
1265 | close (mmap_fd); | |
1266 | #endif | |
1267 | ||
d427b66a | 1268 | if (close (old_file)) |
d7cb42c3 | 1269 | fatal ("Can't close (%s): errno %d\n", old_name, errno); |
d427b66a | 1270 | |
d9d54213 RS |
1271 | if (close (new_file)) |
1272 | fatal ("Can't close (%s): errno %d\n", new_name, errno); | |
d427b66a JB |
1273 | |
1274 | if (stat (new_name, &stat_buf) == -1) | |
d7cb42c3 | 1275 | fatal ("Can't stat (%s): errno %d\n", new_name, errno); |
d427b66a JB |
1276 | |
1277 | n = umask (777); | |
1278 | umask (n); | |
1279 | stat_buf.st_mode |= 0111 & ~n; | |
1280 | if (chmod (new_name, stat_buf.st_mode) == -1) | |
d7cb42c3 | 1281 | fatal ("Can't chmod (%s): errno %d\n", new_name, errno); |
d427b66a | 1282 | } |