Mercurial > hg > xemacs-beta
annotate src/unexelf.c @ 5533:11da5b828d10
shell-command and shell-command-on-region API compliant with FSF 23.3.1
| author | Mats Lidell <mats.lidell@cag.se> |
|---|---|
| date | Sun, 31 Jul 2011 01:29:09 +0200 |
| parents | 308d34e9f07d |
| children |
| rev | line source |
|---|---|
| 428 | 1 /* Copyright (C) 1985, 1986, 1987, 1988, 1990, 1992, 1993 |
| 2 Free Software Foundation, Inc. | |
| 3 | |
| 4 This file is part of XEmacs. | |
| 5 | |
|
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6 XEmacs is free software: you can redistribute it and/or modify it |
| 428 | 7 under the terms of the GNU General Public License as published by the |
|
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8 Free Software Foundation, either version 3 of the License, or (at your |
|
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9 option) any later version. |
| 428 | 10 |
| 11 XEmacs is distributed in the hope that it will be useful, but WITHOUT | |
| 12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 for more details. | |
| 15 | |
| 16 You should have received a copy of the GNU General Public License | |
|
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17 along with XEmacs. If not, see <http://www.gnu.org/licenses/>. */ |
| 428 | 18 |
| 19 /* Synched up with: FSF 20.4. */ | |
| 20 | |
| 21 /* | |
| 22 * unexec.c - Convert a running program into an a.out file. | |
| 23 * | |
| 24 * Author: Spencer W. Thomas | |
| 25 * Computer Science Dept. | |
| 26 * University of Utah | |
| 27 * Date: Tue Mar 2 1982 | |
| 28 * Modified heavily since then. | |
| 29 * | |
| 30 * Synopsis: | |
| 31 * unexec (new_name, a_name, data_start, bss_start, entry_address) | |
| 32 * char *new_name, *a_name; | |
| 33 * unsigned data_start, bss_start, entry_address; | |
| 34 * | |
| 35 * Takes a snapshot of the program and makes an a.out format file in the | |
| 36 * file named by the string argument new_name. | |
| 37 * If a_name is non-NULL, the symbol table will be taken from the given file. | |
| 38 * On some machines, an existing a_name file is required. | |
| 39 * | |
| 40 * The boundaries within the a.out file may be adjusted with the data_start | |
| 41 * and bss_start arguments. Either or both may be given as 0 for defaults. | |
| 42 * | |
| 43 * Data_start gives the boundary between the text segment and the data | |
| 44 * segment of the program. The text segment can contain shared, read-only | |
| 45 * program code and literal data, while the data segment is always unshared | |
| 46 * and unprotected. Data_start gives the lowest unprotected address. | |
| 47 * The value you specify may be rounded down to a suitable boundary | |
| 48 * as required by the machine you are using. | |
| 49 * | |
| 50 * Specifying zero for data_start means the boundary between text and data | |
| 51 * should not be the same as when the program was loaded. | |
| 52 * If NO_REMAP is defined, the argument data_start is ignored and the | |
| 53 * segment boundaries are never changed. | |
| 54 * | |
| 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 * | |
| 64 * If you make improvements I'd like to get them too. | |
| 65 * harpo!utah-cs!thomas, thomas@Utah-20 | |
| 66 * | |
| 67 */ | |
| 68 | |
| 69 /* Even more heavily modified by james@bigtex.cactus.org of Dell Computer Co. | |
| 70 * ELF support added. | |
| 71 * | |
| 72 * Basic theory: the data space of the running process needs to be | |
| 73 * dumped to the output file. Normally we would just enlarge the size | |
| 74 * of .data, scooting everything down. But we can't do that in ELF, | |
| 75 * because there is often something between the .data space and the | |
| 76 * .bss space. | |
| 77 * | |
| 78 * In the temacs dump below, notice that the Global Offset Table | |
| 79 * (.got) and the Dynamic link data (.dynamic) come between .data1 and | |
| 80 * .bss. It does not work to overlap .data with these fields. | |
| 81 * | |
| 82 * The solution is to create a new .data segment. This segment is | |
| 83 * filled with data from the current process. Since the contents of | |
| 84 * various sections refer to sections by index, the new .data segment | |
| 85 * is made the last in the table to avoid changing any existing index. | |
| 86 | |
| 87 * This is an example of how the section headers are changed. "Addr" | |
| 88 * is a process virtual address. "Offset" is a file offset. | |
| 89 | |
| 90 raid:/nfs/raid/src/dist-18.56/src> dump -h temacs | |
| 91 | |
| 92 temacs: | |
| 93 | |
| 94 **** SECTION HEADER TABLE **** | |
| 95 [No] Type Flags Addr Offset Size Name | |
| 96 Link Info Adralgn Entsize | |
| 97 | |
| 98 [1] 1 2 0x80480d4 0xd4 0x13 .interp | |
| 99 0 0 0x1 0 | |
| 100 | |
| 101 [2] 5 2 0x80480e8 0xe8 0x388 .hash | |
| 102 3 0 0x4 0x4 | |
| 103 | |
| 104 [3] 11 2 0x8048470 0x470 0x7f0 .dynsym | |
| 105 4 1 0x4 0x10 | |
| 106 | |
| 107 [4] 3 2 0x8048c60 0xc60 0x3ad .dynstr | |
| 108 0 0 0x1 0 | |
| 109 | |
| 110 [5] 9 2 0x8049010 0x1010 0x338 .rel.plt | |
| 111 3 7 0x4 0x8 | |
| 112 | |
| 113 [6] 1 6 0x8049348 0x1348 0x3 .init | |
| 114 0 0 0x4 0 | |
| 115 | |
| 116 [7] 1 6 0x804934c 0x134c 0x680 .plt | |
| 117 0 0 0x4 0x4 | |
| 118 | |
| 119 [8] 1 6 0x80499cc 0x19cc 0x3c56f .text | |
| 120 0 0 0x4 0 | |
| 121 | |
| 122 [9] 1 6 0x8085f3c 0x3df3c 0x3 .fini | |
| 123 0 0 0x4 0 | |
| 124 | |
| 125 [10] 1 2 0x8085f40 0x3df40 0x69c .rodata | |
| 126 0 0 0x4 0 | |
| 127 | |
| 128 [11] 1 2 0x80865dc 0x3e5dc 0xd51 .rodata1 | |
| 129 0 0 0x4 0 | |
| 130 | |
| 131 [12] 1 3 0x8088330 0x3f330 0x20afc .data | |
| 132 0 0 0x4 0 | |
| 133 | |
| 134 [13] 1 3 0x80a8e2c 0x5fe2c 0x89d .data1 | |
| 135 0 0 0x4 0 | |
| 136 | |
| 137 [14] 1 3 0x80a96cc 0x606cc 0x1a8 .got | |
| 138 0 0 0x4 0x4 | |
| 139 | |
| 140 [15] 6 3 0x80a9874 0x60874 0x80 .dynamic | |
| 141 4 0 0x4 0x8 | |
| 142 | |
| 143 [16] 8 3 0x80a98f4 0x608f4 0x449c .bss | |
| 144 0 0 0x4 0 | |
| 145 | |
| 146 [17] 2 0 0 0x608f4 0x9b90 .symtab | |
| 147 18 371 0x4 0x10 | |
| 148 | |
| 149 [18] 3 0 0 0x6a484 0x8526 .strtab | |
| 150 0 0 0x1 0 | |
| 151 | |
| 152 [19] 3 0 0 0x729aa 0x93 .shstrtab | |
| 153 0 0 0x1 0 | |
| 154 | |
| 155 [20] 1 0 0 0x72a3d 0x68b7 .comment | |
| 156 0 0 0x1 0 | |
| 157 | |
| 158 raid:/nfs/raid/src/dist-18.56/src> dump -h xemacs | |
| 159 | |
| 160 xemacs: | |
| 161 | |
| 162 **** SECTION HEADER TABLE **** | |
| 163 [No] Type Flags Addr Offset Size Name | |
| 164 Link Info Adralgn Entsize | |
| 165 | |
| 166 [1] 1 2 0x80480d4 0xd4 0x13 .interp | |
| 167 0 0 0x1 0 | |
| 168 | |
| 169 [2] 5 2 0x80480e8 0xe8 0x388 .hash | |
| 170 3 0 0x4 0x4 | |
| 171 | |
| 172 [3] 11 2 0x8048470 0x470 0x7f0 .dynsym | |
| 173 4 1 0x4 0x10 | |
| 174 | |
| 175 [4] 3 2 0x8048c60 0xc60 0x3ad .dynstr | |
| 176 0 0 0x1 0 | |
| 177 | |
| 178 [5] 9 2 0x8049010 0x1010 0x338 .rel.plt | |
| 179 3 7 0x4 0x8 | |
| 180 | |
| 181 [6] 1 6 0x8049348 0x1348 0x3 .init | |
| 182 0 0 0x4 0 | |
| 183 | |
| 184 [7] 1 6 0x804934c 0x134c 0x680 .plt | |
| 185 0 0 0x4 0x4 | |
| 186 | |
| 187 [8] 1 6 0x80499cc 0x19cc 0x3c56f .text | |
| 188 0 0 0x4 0 | |
| 189 | |
| 190 [9] 1 6 0x8085f3c 0x3df3c 0x3 .fini | |
| 191 0 0 0x4 0 | |
| 192 | |
| 193 [10] 1 2 0x8085f40 0x3df40 0x69c .rodata | |
| 194 0 0 0x4 0 | |
| 195 | |
| 196 [11] 1 2 0x80865dc 0x3e5dc 0xd51 .rodata1 | |
| 197 0 0 0x4 0 | |
| 198 | |
| 199 [12] 1 3 0x8088330 0x3f330 0x20afc .data | |
| 200 0 0 0x4 0 | |
| 201 | |
| 202 [13] 1 3 0x80a8e2c 0x5fe2c 0x89d .data1 | |
| 203 0 0 0x4 0 | |
| 204 | |
| 205 [14] 1 3 0x80a96cc 0x606cc 0x1a8 .got | |
| 206 0 0 0x4 0x4 | |
| 207 | |
| 208 [15] 6 3 0x80a9874 0x60874 0x80 .dynamic | |
| 209 4 0 0x4 0x8 | |
| 210 | |
| 211 [16] 8 3 0x80c6800 0x7d800 0 .bss | |
| 212 0 0 0x4 0 | |
| 213 | |
| 214 [17] 2 0 0 0x7d800 0x9b90 .symtab | |
| 215 18 371 0x4 0x10 | |
| 216 | |
| 217 [18] 3 0 0 0x87390 0x8526 .strtab | |
| 218 0 0 0x1 0 | |
| 219 | |
| 220 [19] 3 0 0 0x8f8b6 0x93 .shstrtab | |
| 221 0 0 0x1 0 | |
| 222 | |
| 223 [20] 1 0 0 0x8f949 0x68b7 .comment | |
| 224 0 0 0x1 0 | |
| 225 | |
| 226 [21] 1 3 0x80a98f4 0x608f4 0x1cf0c .data | |
| 227 0 0 0x4 0 | |
| 228 | |
| 229 * This is an example of how the file header is changed. "Shoff" is | |
| 230 * the section header offset within the file. Since that table is | |
| 231 * after the new .data section, it is moved. "Shnum" is the number of | |
| 232 * sections, which we increment. | |
| 233 * | |
| 234 * "Phoff" is the file offset to the program header. "Phentsize" and | |
| 235 * "Shentsz" are the program and section header entries sizes respectively. | |
| 236 * These can be larger than the apparent struct sizes. | |
| 237 | |
| 238 raid:/nfs/raid/src/dist-18.56/src> dump -f temacs | |
| 239 | |
| 240 temacs: | |
| 241 | |
| 242 **** ELF HEADER **** | |
| 243 Class Data Type Machine Version | |
| 244 Entry Phoff Shoff Flags Ehsize | |
| 245 Phentsize Phnum Shentsz Shnum Shstrndx | |
| 246 | |
| 247 1 1 2 3 1 | |
| 248 0x80499cc 0x34 0x792f4 0 0x34 | |
| 249 0x20 5 0x28 21 19 | |
| 250 | |
| 251 raid:/nfs/raid/src/dist-18.56/src> dump -f xemacs | |
| 252 | |
| 253 xemacs: | |
| 254 | |
| 255 **** ELF HEADER **** | |
| 256 Class Data Type Machine Version | |
| 257 Entry Phoff Shoff Flags Ehsize | |
| 258 Phentsize Phnum Shentsz Shnum Shstrndx | |
| 259 | |
| 260 1 1 2 3 1 | |
| 261 0x80499cc 0x34 0x96200 0 0x34 | |
| 262 0x20 5 0x28 22 19 | |
| 263 | |
| 264 * These are the program headers. "Offset" is the file offset to the | |
| 265 * segment. "Vaddr" is the memory load address. "Filesz" is the | |
| 266 * segment size as it appears in the file, and "Memsz" is the size in | |
| 267 * memory. Below, the third segment is the code and the fourth is the | |
| 268 * data: the difference between Filesz and Memsz is .bss | |
| 269 | |
| 270 raid:/nfs/raid/src/dist-18.56/src> dump -o temacs | |
| 271 | |
| 272 temacs: | |
| 273 ***** PROGRAM EXECUTION HEADER ***** | |
| 274 Type Offset Vaddr Paddr | |
| 275 Filesz Memsz Flags Align | |
| 276 | |
| 277 6 0x34 0x8048034 0 | |
| 278 0xa0 0xa0 5 0 | |
| 279 | |
| 280 3 0xd4 0 0 | |
| 281 0x13 0 4 0 | |
| 282 | |
| 283 1 0x34 0x8048034 0 | |
| 284 0x3f2f9 0x3f2f9 5 0x1000 | |
| 285 | |
| 286 1 0x3f330 0x8088330 0 | |
| 287 0x215c4 0x25a60 7 0x1000 | |
| 288 | |
| 289 2 0x60874 0x80a9874 0 | |
| 290 0x80 0 7 0 | |
| 291 | |
| 292 raid:/nfs/raid/src/dist-18.56/src> dump -o xemacs | |
| 293 | |
| 294 xemacs: | |
| 295 ***** PROGRAM EXECUTION HEADER ***** | |
| 296 Type Offset Vaddr Paddr | |
| 297 Filesz Memsz Flags Align | |
| 298 | |
| 299 6 0x34 0x8048034 0 | |
| 300 0xa0 0xa0 5 0 | |
| 301 | |
| 302 3 0xd4 0 0 | |
| 303 0x13 0 4 0 | |
| 304 | |
| 305 1 0x34 0x8048034 0 | |
| 306 0x3f2f9 0x3f2f9 5 0x1000 | |
| 307 | |
| 308 1 0x3f330 0x8088330 0 | |
| 309 0x3e4d0 0x3e4d0 7 0x1000 | |
| 310 | |
| 311 2 0x60874 0x80a9874 0 | |
| 312 0x80 0 7 0 | |
| 313 | |
| 314 | |
| 315 */ | |
| 316 | |
| 317 /* Modified by wtien@urbana.mcd.mot.com of Motorola Inc. | |
| 318 * | |
| 319 * The above mechanism does not work if the unexeced ELF file is being | |
| 320 * re-layout by other applications (such as `strip'). All the applications | |
| 321 * that re-layout the internal of ELF will layout all sections in ascending | |
| 322 * order of their file offsets. After the re-layout, the data2 section will | |
| 323 * still be the LAST section in the section header vector, but its file offset | |
| 324 * is now being pushed far away down, and causes part of it not to be mapped | |
| 325 * in (ie. not covered by the load segment entry in PHDR vector), therefore | |
| 326 * causes the new binary to fail. | |
| 327 * | |
| 328 * The solution is to modify the unexec algorithm to insert the new data2 | |
| 329 * section header right before the new bss section header, so their file | |
| 330 * offsets will be in the ascending order. Since some of the section's (all | |
| 331 * sections AFTER the bss section) indexes are now changed, we also need to | |
| 332 * modify some fields to make them point to the right sections. This is done | |
| 333 * by macro PATCH_INDEX. All the fields that need to be patched are: | |
| 334 * | |
| 335 * 1. ELF header e_shstrndx field. | |
| 336 * 2. section header sh_link and sh_info field. | |
| 337 * 3. symbol table entry st_shndx field. | |
| 338 * | |
| 339 * The above example now should look like: | |
| 340 | |
| 341 **** SECTION HEADER TABLE **** | |
| 342 [No] Type Flags Addr Offset Size Name | |
| 343 Link Info Adralgn Entsize | |
| 344 | |
| 345 [1] 1 2 0x80480d4 0xd4 0x13 .interp | |
| 346 0 0 0x1 0 | |
| 347 | |
| 348 [2] 5 2 0x80480e8 0xe8 0x388 .hash | |
| 349 3 0 0x4 0x4 | |
| 350 | |
| 351 [3] 11 2 0x8048470 0x470 0x7f0 .dynsym | |
| 352 4 1 0x4 0x10 | |
| 353 | |
| 354 [4] 3 2 0x8048c60 0xc60 0x3ad .dynstr | |
| 355 0 0 0x1 0 | |
| 356 | |
| 357 [5] 9 2 0x8049010 0x1010 0x338 .rel.plt | |
| 358 3 7 0x4 0x8 | |
| 359 | |
| 360 [6] 1 6 0x8049348 0x1348 0x3 .init | |
| 361 0 0 0x4 0 | |
| 362 | |
| 363 [7] 1 6 0x804934c 0x134c 0x680 .plt | |
| 364 0 0 0x4 0x4 | |
| 365 | |
| 366 [8] 1 6 0x80499cc 0x19cc 0x3c56f .text | |
| 367 0 0 0x4 0 | |
| 368 | |
| 369 [9] 1 6 0x8085f3c 0x3df3c 0x3 .fini | |
| 370 0 0 0x4 0 | |
| 371 | |
| 372 [10] 1 2 0x8085f40 0x3df40 0x69c .rodata | |
| 373 0 0 0x4 0 | |
| 374 | |
| 375 [11] 1 2 0x80865dc 0x3e5dc 0xd51 .rodata1 | |
| 376 0 0 0x4 0 | |
| 377 | |
| 378 [12] 1 3 0x8088330 0x3f330 0x20afc .data | |
| 379 0 0 0x4 0 | |
| 380 | |
| 381 [13] 1 3 0x80a8e2c 0x5fe2c 0x89d .data1 | |
| 382 0 0 0x4 0 | |
| 383 | |
| 384 [14] 1 3 0x80a96cc 0x606cc 0x1a8 .got | |
| 385 0 0 0x4 0x4 | |
| 386 | |
| 387 [15] 6 3 0x80a9874 0x60874 0x80 .dynamic | |
| 388 4 0 0x4 0x8 | |
| 389 | |
| 390 [16] 1 3 0x80a98f4 0x608f4 0x1cf0c .data | |
| 391 0 0 0x4 0 | |
| 392 | |
| 393 [17] 8 3 0x80c6800 0x7d800 0 .bss | |
| 394 0 0 0x4 0 | |
| 395 | |
| 396 [18] 2 0 0 0x7d800 0x9b90 .symtab | |
| 397 19 371 0x4 0x10 | |
| 398 | |
| 399 [19] 3 0 0 0x87390 0x8526 .strtab | |
| 400 0 0 0x1 0 | |
| 401 | |
| 402 [20] 3 0 0 0x8f8b6 0x93 .shstrtab | |
| 403 0 0 0x1 0 | |
| 404 | |
| 405 [21] 1 0 0 0x8f949 0x68b7 .comment | |
| 406 0 0 0x1 0 | |
| 407 | |
| 408 */ | |
| 409 | |
| 410 #ifndef emacs | |
| 411 #define fatal(a, b, c) fprintf (stderr, a, b, c), exit (1) | |
| 412 #else | |
| 413 #include <config.h> | |
| 2844 | 414 #include "lisp.h" |
| 415 extern DOESNT_RETURN fatal (const CIbyte *, ...); | |
| 428 | 416 #endif |
| 417 | |
| 418 #include <sys/types.h> | |
| 419 #include <stdio.h> | |
| 420 #include <sys/stat.h> | |
| 421 #include <memory.h> | |
| 422 #include <string.h> | |
| 423 #include <errno.h> | |
| 424 #include <unistd.h> | |
| 425 #include <fcntl.h> | |
| 446 | 426 #ifdef HAVE_ELF_H |
| 428 | 427 #include <elf.h> |
| 428 #endif | |
| 429 #include <sys/mman.h> | |
| 430 #if defined (__sony_news) && defined (_SYSTYPE_SYSV) | |
| 431 #include <sys/elf_mips.h> | |
| 432 #include <sym.h> | |
| 433 #endif /* __sony_news && _SYSTYPE_SYSV */ | |
| 434 #ifdef __sgi | |
| 435 #include <sym.h> /* for HDRR declaration */ | |
| 436 #endif /* __sgi */ | |
| 437 | |
| 2286 | 438 #include "compiler.h" |
| 439 | |
| 428 | 440 #if defined (__alpha__) && !defined (__NetBSD__) && !defined (__OpenBSD__) |
| 441 /* Declare COFF debugging symbol table. This used to be in | |
| 442 /usr/include/sym.h, but this file is no longer included in Red Hat | |
| 443 5.0 and presumably in any other glibc 2.x based distribution. */ | |
| 444 typedef struct { | |
| 445 short magic; | |
| 446 short vstamp; | |
| 447 int ilineMax; | |
| 448 int idnMax; | |
| 449 int ipdMax; | |
| 450 int isymMax; | |
| 451 int ioptMax; | |
| 452 int iauxMax; | |
| 453 int issMax; | |
| 454 int issExtMax; | |
| 455 int ifdMax; | |
| 456 int crfd; | |
| 457 int iextMax; | |
| 458 long cbLine; | |
| 459 long cbLineOffset; | |
| 460 long cbDnOffset; | |
| 461 long cbPdOffset; | |
| 462 long cbSymOffset; | |
| 463 long cbOptOffset; | |
| 464 long cbAuxOffset; | |
| 465 long cbSsOffset; | |
| 466 long cbSsExtOffset; | |
| 467 long cbFdOffset; | |
| 468 long cbRfdOffset; | |
| 469 long cbExtOffset; | |
| 470 } HDRR, *pHDRR; | |
| 471 #define cbHDRR sizeof(HDRR) | |
| 472 #define hdrNil ((pHDRR)0) | |
| 473 #endif | |
| 474 | |
| 475 #ifdef __OpenBSD__ | |
| 476 # include <sys/exec_elf.h> | |
| 477 #endif | |
| 478 | |
| 2987 | 479 #if defined(__FreeBSD__) && (defined(__alpha__) || defined(_LP64)) |
| 2687 | 480 # ifdef __STDC__ |
| 481 # define ElfW(type) Elf64_##type | |
| 482 # else | |
| 483 # define ElfW(type) Elf64_/**/type | |
| 484 # endif | |
| 485 #endif | |
| 486 | |
| 428 | 487 #if __GNU_LIBRARY__ - 0 >= 6 |
| 488 # include <link.h> /* get ElfW etc */ | |
| 489 #endif | |
| 490 | |
| 491 #ifndef ElfW | |
| 492 # ifdef __STDC__ | |
| 493 # define ElfW(type) Elf32_##type | |
| 494 # else | |
| 495 # define ElfW(type) Elf32_/**/type | |
| 496 # endif | |
| 497 #endif | |
| 498 | |
| 499 #ifndef ELF_BSS_SECTION_NAME | |
| 500 #define ELF_BSS_SECTION_NAME ".bss" | |
| 501 #endif | |
| 502 | |
| 503 /* Get the address of a particular section or program header entry, | |
| 504 * accounting for the size of the entries. | |
| 505 */ | |
| 506 /* | |
| 507 On PPC Reference Platform running Solaris 2.5.1 | |
| 508 the plt section is also of type NOBI like the bss section. | |
| 509 (not really stored) and therefore sections after the bss | |
| 510 section start at the plt offset. The plt section is always | |
| 511 the one just before the bss section. | |
| 512 Thus, we modify the test from | |
| 513 if (NEW_SECTION_H (nn).sh_offset >= new_data2_offset) | |
| 514 to | |
| 515 if (NEW_SECTION_H (nn).sh_offset >= | |
| 516 OLD_SECTION_H (old_bss_index-1).sh_offset) | |
| 517 This is just a hack. We should put the new data section | |
| 518 before the .plt section. | |
| 519 And we should not have this routine at all but use | |
| 520 the libelf library to read the old file and create the new | |
| 521 file. | |
| 522 The changed code is minimal and depends on prep set in m/prep.h | |
| 523 Erik Deumens | |
| 524 Quantum Theory Project | |
| 525 University of Florida | |
| 526 deumens@qtp.ufl.edu | |
| 527 Apr 23, 1996 | |
| 528 */ | |
| 529 | |
| 530 #define OLD_SECTION_H(n) \ | |
| 531 (*(ElfW(Shdr) *) ((byte *) old_section_h + old_file_h->e_shentsize * (n))) | |
| 532 #define NEW_SECTION_H(n) \ | |
| 533 (*(ElfW(Shdr) *) ((byte *) new_section_h + new_file_h->e_shentsize * (n))) | |
| 534 #define OLD_PROGRAM_H(n) \ | |
| 535 (*(ElfW(Phdr) *) ((byte *) old_program_h + old_file_h->e_phentsize * (n))) | |
| 536 #define NEW_PROGRAM_H(n) \ | |
| 537 (*(ElfW(Phdr) *) ((byte *) new_program_h + new_file_h->e_phentsize * (n))) | |
| 538 | |
| 539 #define PATCH_INDEX(n) \ | |
| 540 do { \ | |
| 541 if ((int) (n) >= old_bss_index) \ | |
| 542 (n)++; } while (0) | |
| 543 typedef unsigned char byte; | |
| 544 | |
| 545 /* Round X up to a multiple of Y. */ | |
| 546 | |
| 547 static ElfW(Addr) | |
| 548 round_up (ElfW(Addr) x, ElfW(Addr) y) | |
| 549 { | |
| 550 int rem = x % y; | |
| 551 if (rem == 0) | |
| 552 return x; | |
| 553 return x - rem + y; | |
| 554 } | |
| 555 | |
| 556 /* **************************************************************** | |
| 557 * unexec | |
| 558 * | |
| 559 * driving logic. | |
| 560 * | |
| 561 * In ELF, this works by replacing the old .bss section with a new | |
| 562 * .data section, and inserting an empty .bss immediately afterwards. | |
| 563 * | |
| 564 */ | |
| 2844 | 565 int |
| 3036 | 566 unexec (Extbyte *new_name, Extbyte *old_name, uintptr_t UNUSED (data_start), |
| 567 uintptr_t UNUSED (bss_start), uintptr_t UNUSED (entry_address)) | |
| 428 | 568 { |
| 569 int new_file, old_file, new_file_size; | |
| 570 | |
| 571 /* Pointers to the base of the image of the two files. */ | |
| 572 caddr_t old_base, new_base; | |
| 573 | |
| 574 /* Pointers to the file, program and section headers for the old and new | |
| 575 * files. | |
| 576 */ | |
| 577 ElfW(Ehdr) *old_file_h, *new_file_h; | |
| 578 ElfW(Phdr) *old_program_h, *new_program_h; | |
| 579 ElfW(Shdr) *old_section_h, *new_section_h; | |
| 580 | |
| 581 /* Point to the section name table in the old file */ | |
| 582 char *old_section_names; | |
| 583 | |
| 584 ElfW(Addr) old_bss_addr, new_bss_addr; | |
| 585 ElfW(Word) old_bss_size, new_data2_size; | |
| 586 ElfW(Off) new_data2_offset; | |
| 587 ElfW(Addr) new_data2_addr; | |
| 588 | |
| 589 int n, nn, old_bss_index, old_data_index, new_data2_index; | |
| 590 int old_sbss_index, old_mdebug_index; | |
| 591 struct stat stat_buf; | |
| 592 | |
| 593 /* Open the old file & map it into the address space. */ | |
| 594 | |
| 595 old_file = open (old_name, O_RDONLY); | |
| 596 | |
| 597 if (old_file < 0) | |
| 598 fatal ("Can't open %s for reading: errno %d\n", old_name, errno); | |
| 599 | |
| 600 if (fstat (old_file, &stat_buf) == -1) | |
| 601 fatal ("Can't fstat (%s): errno %d\n", old_name, errno); | |
| 602 | |
| 603 old_base = (caddr_t) mmap (0, stat_buf.st_size, PROT_READ, MAP_SHARED, old_file, 0); | |
| 604 | |
| 605 if (old_base == (caddr_t) -1) | |
| 606 fatal ("Can't mmap (%s): errno %d\n", old_name, errno); | |
| 607 | |
| 608 #ifdef DEBUG | |
| 609 fprintf (stderr, "mmap (%s, %x) -> %x\n", old_name, stat_buf.st_size, | |
| 610 old_base); | |
| 611 #endif | |
| 612 | |
| 613 /* Get pointers to headers & section names */ | |
| 614 | |
| 615 old_file_h = (ElfW(Ehdr) *) old_base; | |
| 616 old_program_h = (ElfW(Phdr) *) ((byte *) old_base + old_file_h->e_phoff); | |
| 617 old_section_h = (ElfW(Shdr) *) ((byte *) old_base + old_file_h->e_shoff); | |
| 618 old_section_names = (char *) old_base | |
| 619 + OLD_SECTION_H (old_file_h->e_shstrndx).sh_offset; | |
| 620 | |
| 621 /* Find the old .bss section. Figure out parameters of the new | |
| 622 * data2 and bss sections. | |
| 623 */ | |
| 624 | |
| 625 for (old_bss_index = 1; old_bss_index < (int) old_file_h->e_shnum; | |
| 626 old_bss_index++) | |
| 627 { | |
| 628 #ifdef DEBUG | |
| 629 fprintf (stderr, "Looking for .bss - found %s\n", | |
| 630 old_section_names + OLD_SECTION_H (old_bss_index).sh_name); | |
| 631 #endif | |
| 632 if (!strcmp (old_section_names + OLD_SECTION_H (old_bss_index).sh_name, | |
| 633 ELF_BSS_SECTION_NAME)) | |
| 634 break; | |
| 635 } | |
| 636 if (old_bss_index == old_file_h->e_shnum) | |
| 2844 | 637 fatal ("Can't find .bss in %s.\n", old_name); |
| 428 | 638 |
| 639 for (old_sbss_index = 1; old_sbss_index < (int) old_file_h->e_shnum; | |
| 640 old_sbss_index++) | |
| 641 { | |
| 642 #ifdef DEBUG | |
| 643 fprintf (stderr, "Looking for .sbss - found %s\n", | |
| 644 old_section_names + OLD_SECTION_H (old_sbss_index).sh_name); | |
| 645 #endif | |
| 646 if (!strcmp (old_section_names + OLD_SECTION_H (old_sbss_index).sh_name, | |
| 647 ".sbss")) | |
| 648 break; | |
| 649 } | |
| 650 if (old_sbss_index == old_file_h->e_shnum) | |
| 651 { | |
| 652 old_sbss_index = -1; | |
| 653 old_bss_addr = OLD_SECTION_H(old_bss_index).sh_addr; | |
| 654 old_bss_size = OLD_SECTION_H(old_bss_index).sh_size; | |
| 655 new_data2_index = old_bss_index; | |
| 656 } | |
| 657 else | |
| 658 { | |
| 659 old_bss_addr = OLD_SECTION_H(old_sbss_index).sh_addr; | |
| 660 old_bss_size = OLD_SECTION_H(old_bss_index).sh_size | |
| 661 + OLD_SECTION_H(old_sbss_index).sh_size; | |
| 662 new_data2_index = old_sbss_index; | |
| 663 } | |
| 664 | |
| 665 for (old_mdebug_index = 1; old_mdebug_index < (int) old_file_h->e_shnum; | |
| 666 old_mdebug_index++) | |
| 667 { | |
| 668 #ifdef DEBUG | |
| 669 fprintf (stderr, "Looking for .mdebug - found %s\n", | |
| 670 old_section_names + OLD_SECTION_H (old_mdebug_index).sh_name); | |
| 671 #endif | |
| 672 if (!strcmp (old_section_names + OLD_SECTION_H (old_mdebug_index).sh_name, | |
| 673 ".mdebug")) | |
| 674 break; | |
| 675 } | |
| 676 if (old_mdebug_index == old_file_h->e_shnum) | |
| 677 old_mdebug_index = 0; | |
| 678 | |
| 442 | 679 for (old_data_index = 1; old_data_index < (int) old_file_h->e_shnum; |
| 680 old_data_index++) | |
| 681 { | |
| 682 #ifdef DEBUG | |
| 683 fprintf (stderr, "Looking for .data - found %s\n", | |
| 684 old_section_names + OLD_SECTION_H (old_data_index).sh_name); | |
| 685 #endif | |
| 686 if (!strcmp (old_section_names + OLD_SECTION_H (old_data_index).sh_name, | |
| 687 ".data")) | |
| 688 break; | |
| 689 } | |
| 690 if (old_data_index == old_file_h->e_shnum) | |
| 691 old_data_index = 0; | |
| 692 | |
| 428 | 693 #if defined (emacs) || !defined (DEBUG) |
| 694 new_bss_addr = (ElfW(Addr)) sbrk (0); | |
| 695 #else | |
| 696 new_bss_addr = old_bss_addr + old_bss_size + 0x1234; | |
| 697 #endif | |
| 698 new_data2_addr = old_bss_addr; | |
| 699 new_data2_size = new_bss_addr - old_bss_addr; | |
| 442 | 700 new_data2_offset = OLD_SECTION_H (old_data_index).sh_offset + |
| 701 (new_data2_addr - OLD_SECTION_H (old_data_index).sh_addr); | |
| 428 | 702 |
| 703 #ifdef DEBUG | |
| 704 fprintf (stderr, "old_bss_index %d\n", old_bss_index); | |
| 705 fprintf (stderr, "old_bss_addr %x\n", old_bss_addr); | |
| 706 fprintf (stderr, "old_bss_size %x\n", old_bss_size); | |
| 707 fprintf (stderr, "new_bss_addr %x\n", new_bss_addr); | |
| 708 fprintf (stderr, "new_data2_addr %x\n", new_data2_addr); | |
| 709 fprintf (stderr, "new_data2_size %x\n", new_data2_size); | |
| 710 fprintf (stderr, "new_data2_offset %x\n", new_data2_offset); | |
| 711 #endif | |
| 712 | |
| 713 if ((unsigned) new_bss_addr < (unsigned) old_bss_addr + old_bss_size) | |
| 2844 | 714 fatal (".bss shrank when undumping???\n"); |
| 428 | 715 |
| 716 /* Set the output file to the right size and mmap it. Set | |
| 717 * pointers to various interesting objects. stat_buf still has | |
| 718 * old_file data. | |
| 719 */ | |
| 720 | |
| 721 new_file = open (new_name, O_RDWR | O_CREAT, 0666); | |
| 722 if (new_file < 0) | |
| 723 fatal ("Can't creat (%s): errno %d\n", new_name, errno); | |
| 724 | |
| 725 new_file_size = stat_buf.st_size + old_file_h->e_shentsize + new_data2_size; | |
| 726 | |
| 727 if (ftruncate (new_file, new_file_size)) | |
| 728 fatal ("Can't ftruncate (%s): errno %d\n", new_name, errno); | |
| 729 | |
| 730 new_base = (caddr_t) mmap (0, new_file_size, PROT_READ | PROT_WRITE, | |
| 731 #ifdef UNEXEC_USE_MAP_PRIVATE | |
| 732 MAP_PRIVATE, | |
| 733 #else | |
| 734 MAP_SHARED, | |
| 735 #endif | |
| 736 new_file, 0); | |
| 737 | |
| 738 if (new_base == (caddr_t) -1) | |
| 739 fatal ("Can't mmap (%s): errno %d\n", new_name, errno); | |
| 740 | |
| 741 new_file_h = (ElfW(Ehdr) *) new_base; | |
| 742 new_program_h = (ElfW(Phdr) *) ((byte *) new_base + old_file_h->e_phoff); | |
| 743 new_section_h = (ElfW(Shdr) *) | |
| 744 ((byte *) new_base + old_file_h->e_shoff + new_data2_size); | |
| 745 | |
| 746 /* Make our new file, program and section headers as copies of the | |
| 747 * originals. | |
| 748 */ | |
| 749 | |
| 750 memcpy (new_file_h, old_file_h, old_file_h->e_ehsize); | |
| 751 memcpy (new_program_h, old_program_h, | |
| 752 old_file_h->e_phnum * old_file_h->e_phentsize); | |
| 753 | |
| 754 /* Modify the e_shstrndx if necessary. */ | |
| 755 PATCH_INDEX (new_file_h->e_shstrndx); | |
| 756 | |
| 757 /* Fix up file header. We'll add one section. Section header is | |
| 758 * further away now. | |
| 759 */ | |
| 760 | |
| 761 new_file_h->e_shoff += new_data2_size; | |
| 762 new_file_h->e_shnum += 1; | |
| 763 | |
| 764 #ifdef DEBUG | |
| 765 fprintf (stderr, "Old section offset %x\n", old_file_h->e_shoff); | |
| 766 fprintf (stderr, "Old section count %d\n", old_file_h->e_shnum); | |
| 767 fprintf (stderr, "New section offset %x\n", new_file_h->e_shoff); | |
| 768 fprintf (stderr, "New section count %d\n", new_file_h->e_shnum); | |
| 769 #endif | |
| 770 | |
| 771 /* Fix up a new program header. Extend the writable data segment so | |
| 772 * that the bss area is covered too. Find that segment by looking | |
| 773 * for a segment that ends just before the .bss area. Make sure | |
| 774 * that no segments are above the new .data2. Put a loop at the end | |
| 775 * to adjust the offset and address of any segment that is above | |
| 776 * data2, just in case we decide to allow this later. | |
| 777 */ | |
| 778 | |
| 779 for (n = new_file_h->e_phnum - 1; n >= 0; n--) | |
| 780 { | |
| 781 /* Compute maximum of all requirements for alignment of section. */ | |
| 782 ElfW(Word) alignment = (NEW_PROGRAM_H (n)).p_align; | |
| 783 if ((OLD_SECTION_H (old_bss_index)).sh_addralign > alignment) | |
| 784 alignment = OLD_SECTION_H (old_bss_index).sh_addralign; | |
| 785 | |
| 786 #ifdef __mips | |
| 787 /* According to r02kar@x4u2.desy.de (Karsten Kuenne) | |
| 788 and oliva@gnu.org (Alexandre Oliva), on IRIX 5.2, we | |
| 789 always get "Program segment above .bss" when dumping | |
| 790 when the executable doesn't have an sbss section. */ | |
| 791 if (old_sbss_index != -1) | |
| 792 #endif /* __mips */ | |
| 793 if (NEW_PROGRAM_H (n).p_vaddr + NEW_PROGRAM_H (n).p_filesz | |
| 794 > (old_sbss_index == -1 | |
| 795 ? old_bss_addr | |
| 796 : round_up (old_bss_addr, alignment))) | |
| 2844 | 797 fatal ("Program segment above .bss in %s\n", old_name); |
| 428 | 798 |
| 799 if (NEW_PROGRAM_H (n).p_type == PT_LOAD | |
| 800 && (round_up ((NEW_PROGRAM_H (n)).p_vaddr | |
| 801 + (NEW_PROGRAM_H (n)).p_filesz, | |
| 802 alignment) | |
| 803 == round_up (old_bss_addr, alignment))) | |
| 804 break; | |
| 805 } | |
| 806 if (n < 0) | |
| 2844 | 807 fatal ("Couldn't find segment next to .bss in %s\n", old_name); |
| 428 | 808 |
| 809 /* Make sure that the size includes any padding before the old .bss | |
| 810 section. */ | |
| 811 NEW_PROGRAM_H (n).p_filesz = new_bss_addr - NEW_PROGRAM_H (n).p_vaddr; | |
| 812 NEW_PROGRAM_H (n).p_memsz = NEW_PROGRAM_H (n).p_filesz; | |
| 813 | |
| 814 #if 0 /* Maybe allow section after data2 - does this ever happen? */ | |
| 815 for (n = new_file_h->e_phnum - 1; n >= 0; n--) | |
| 816 { | |
| 817 if (NEW_PROGRAM_H (n).p_vaddr | |
| 818 && NEW_PROGRAM_H (n).p_vaddr >= new_data2_addr) | |
| 819 NEW_PROGRAM_H (n).p_vaddr += new_data2_size - old_bss_size; | |
| 820 | |
| 821 if (NEW_PROGRAM_H (n).p_offset >= new_data2_offset) | |
| 822 NEW_PROGRAM_H (n).p_offset += new_data2_size; | |
| 823 } | |
| 824 #endif | |
| 825 | |
| 826 /* Fix up section headers based on new .data2 section. Any section | |
| 827 * whose offset or virtual address is after the new .data2 section | |
| 828 * gets its value adjusted. .bss size becomes zero and new address | |
| 829 * is set. data2 section header gets added by copying the existing | |
| 830 * .data header and modifying the offset, address and size. | |
| 831 */ | |
| 832 for (old_data_index = 1; old_data_index < (int) old_file_h->e_shnum; | |
| 833 old_data_index++) | |
| 834 if (!strcmp (old_section_names + OLD_SECTION_H (old_data_index).sh_name, | |
| 835 ".data")) | |
| 836 break; | |
| 837 if (old_data_index == old_file_h->e_shnum) | |
| 2844 | 838 fatal ("Can't find .data in %s.\n", old_name); |
| 428 | 839 |
| 840 /* Walk through all section headers, insert the new data2 section right | |
| 841 before the new bss section. */ | |
| 842 for (n = 1, nn = 1; n < (int) old_file_h->e_shnum; n++, nn++) | |
| 843 { | |
| 844 caddr_t src; | |
| 845 /* If it is (s)bss section, insert the new data2 section before it. */ | |
| 846 /* new_data2_index is the index of either old_sbss or old_bss, that was | |
| 847 chosen as a section for new_data2. */ | |
| 848 if (n == new_data2_index) | |
| 849 { | |
| 850 /* Steal the data section header for this data2 section. */ | |
| 851 memcpy (&NEW_SECTION_H (nn), &OLD_SECTION_H (old_data_index), | |
| 852 new_file_h->e_shentsize); | |
| 853 | |
| 854 NEW_SECTION_H (nn).sh_addr = new_data2_addr; | |
| 855 NEW_SECTION_H (nn).sh_offset = new_data2_offset; | |
| 856 NEW_SECTION_H (nn).sh_size = new_data2_size; | |
| 857 /* Use the bss section's alignment. This will assure that the | |
| 858 new data2 section always be placed in the same spot as the old | |
| 859 bss section by any other application. */ | |
| 860 NEW_SECTION_H (nn).sh_addralign = OLD_SECTION_H (n).sh_addralign; | |
| 861 | |
| 862 /* Now copy over what we have in the memory now. */ | |
| 863 memcpy (NEW_SECTION_H (nn).sh_offset + new_base, | |
| 864 (caddr_t) OLD_SECTION_H (n).sh_addr, | |
| 865 new_data2_size); | |
| 866 nn++; | |
| 867 } | |
| 868 | |
| 869 memcpy (&NEW_SECTION_H (nn), &OLD_SECTION_H (n), | |
| 870 old_file_h->e_shentsize); | |
| 871 | |
| 872 if (n == old_bss_index | |
| 873 /* The new bss and sbss section's size is zero, and its file offset | |
| 874 and virtual address should be off by NEW_DATA2_SIZE. */ | |
| 875 || n == old_sbss_index | |
| 876 ) | |
| 877 { | |
| 878 /* NN should be `old_s?bss_index + 1' at this point. */ | |
| 879 NEW_SECTION_H (nn).sh_offset = | |
| 880 NEW_SECTION_H (new_data2_index).sh_offset + new_data2_size; | |
| 881 NEW_SECTION_H (nn).sh_addr = | |
| 882 NEW_SECTION_H (new_data2_index).sh_addr + new_data2_size; | |
| 883 /* Let the new bss section address alignment be the same as the | |
| 884 section address alignment followed the old bss section, so | |
| 885 this section will be placed in exactly the same place. */ | |
| 886 NEW_SECTION_H (nn).sh_addralign = OLD_SECTION_H (nn).sh_addralign; | |
| 887 NEW_SECTION_H (nn).sh_size = 0; | |
| 888 } | |
| 889 else | |
| 890 { | |
| 891 /* Any section that was original placed AFTER the bss | |
| 892 section should now be off by NEW_DATA2_SIZE. */ | |
| 893 #ifdef SOLARIS_POWERPC | |
| 894 /* On PPC Reference Platform running Solaris 2.5.1 | |
| 895 the plt section is also of type NOBI like the bss section. | |
| 896 (not really stored) and therefore sections after the bss | |
| 897 section start at the plt offset. The plt section is always | |
| 898 the one just before the bss section. | |
| 899 It would be better to put the new data section before | |
| 900 the .plt section, or use libelf instead. | |
| 901 Erik Deumens, deumens@qtp.ufl.edu. */ | |
| 902 if (NEW_SECTION_H (nn).sh_offset | |
| 903 >= OLD_SECTION_H (old_bss_index-1).sh_offset) | |
| 904 NEW_SECTION_H (nn).sh_offset += new_data2_size; | |
| 905 #else | |
| 906 if (round_up (NEW_SECTION_H (nn).sh_offset, | |
| 907 OLD_SECTION_H (old_bss_index).sh_addralign) | |
| 908 >= new_data2_offset) | |
| 909 NEW_SECTION_H (nn).sh_offset += new_data2_size; | |
| 910 #endif | |
| 911 /* Any section that was originally placed after the section | |
| 912 header table should now be off by the size of one section | |
| 913 header table entry. */ | |
| 914 if (NEW_SECTION_H (nn).sh_offset > new_file_h->e_shoff) | |
| 915 NEW_SECTION_H (nn).sh_offset += new_file_h->e_shentsize; | |
| 916 } | |
| 917 | |
| 918 /* If any section hdr refers to the section after the new .data | |
| 919 section, make it refer to next one because we have inserted | |
| 920 a new section in between. */ | |
| 921 | |
| 922 PATCH_INDEX (NEW_SECTION_H (nn).sh_link); | |
| 923 /* For symbol tables, info is a symbol table index, | |
| 924 so don't change it. */ | |
| 925 if (NEW_SECTION_H (nn).sh_type != SHT_SYMTAB | |
| 926 && NEW_SECTION_H (nn).sh_type != SHT_DYNSYM) | |
| 927 PATCH_INDEX (NEW_SECTION_H (nn).sh_info); | |
| 928 | |
| 929 /* Now, start to copy the content of sections. */ | |
| 930 if (NEW_SECTION_H (nn).sh_type == SHT_NULL | |
| 931 || NEW_SECTION_H (nn).sh_type == SHT_NOBITS) | |
| 932 continue; | |
| 933 | |
| 934 /* Write out the sections. .data and .data1 (and data2, called | |
| 935 ".data" in the strings table) get copied from the current process | |
| 936 instead of the old file. */ | |
| 937 if (!strcmp (old_section_names + NEW_SECTION_H (n).sh_name, ".data") | |
| 938 || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name), | |
| 939 ".sdata") | |
| 940 /* Taking these sections from the current process, breaks | |
| 941 Linux in a subtle way. Binaries only run on the | |
| 942 architecture (e.g. i586 vs i686) of the dumping machine */ | |
| 943 #ifdef __sgi | |
| 944 || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name), | |
| 945 ".lit4") | |
| 946 || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name), | |
| 947 ".lit8") | |
| 948 || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name), | |
| 949 ".got") | |
| 950 #endif | |
| 951 || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name), | |
| 952 ".sdata1") | |
| 953 || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name), | |
| 954 ".data1")) | |
| 955 src = (caddr_t) OLD_SECTION_H (n).sh_addr; | |
| 956 else | |
| 957 src = old_base + OLD_SECTION_H (n).sh_offset; | |
| 958 | |
| 959 memcpy (NEW_SECTION_H (nn).sh_offset + new_base, src, | |
| 960 NEW_SECTION_H (nn).sh_size); | |
| 961 | |
| 962 #ifdef __alpha__ | |
| 963 /* Update Alpha COFF symbol table: */ | |
| 964 if (strcmp (old_section_names + OLD_SECTION_H (n).sh_name, ".mdebug") | |
| 965 == 0) | |
| 966 { | |
| 967 pHDRR symhdr = (pHDRR) (NEW_SECTION_H (nn).sh_offset + new_base); | |
| 968 | |
| 969 symhdr->cbLineOffset += new_data2_size; | |
| 970 symhdr->cbDnOffset += new_data2_size; | |
| 971 symhdr->cbPdOffset += new_data2_size; | |
| 972 symhdr->cbSymOffset += new_data2_size; | |
| 973 symhdr->cbOptOffset += new_data2_size; | |
| 974 symhdr->cbAuxOffset += new_data2_size; | |
| 975 symhdr->cbSsOffset += new_data2_size; | |
| 976 symhdr->cbSsExtOffset += new_data2_size; | |
| 977 symhdr->cbFdOffset += new_data2_size; | |
| 978 symhdr->cbRfdOffset += new_data2_size; | |
| 979 symhdr->cbExtOffset += new_data2_size; | |
| 980 } | |
| 981 #endif /* __alpha__ */ | |
| 982 | |
| 983 #if defined (__sony_news) && defined (_SYSTYPE_SYSV) | |
| 984 if (NEW_SECTION_H (nn).sh_type == SHT_MIPS_DEBUG && old_mdebug_index) | |
| 985 { | |
| 986 int diff = NEW_SECTION_H(nn).sh_offset | |
| 987 - OLD_SECTION_H(old_mdebug_index).sh_offset; | |
| 988 HDRR *phdr = (HDRR *)(NEW_SECTION_H (nn).sh_offset + new_base); | |
| 989 | |
| 990 if (diff) | |
| 991 { | |
| 992 phdr->cbLineOffset += diff; | |
| 993 phdr->cbDnOffset += diff; | |
| 994 phdr->cbPdOffset += diff; | |
| 995 phdr->cbSymOffset += diff; | |
| 996 phdr->cbOptOffset += diff; | |
| 997 phdr->cbAuxOffset += diff; | |
| 998 phdr->cbSsOffset += diff; | |
| 999 phdr->cbSsExtOffset += diff; | |
| 1000 phdr->cbFdOffset += diff; | |
| 1001 phdr->cbRfdOffset += diff; | |
| 1002 phdr->cbExtOffset += diff; | |
| 1003 } | |
| 1004 } | |
| 1005 #endif /* __sony_news && _SYSTYPE_SYSV */ | |
| 1006 | |
| 1007 #ifdef __sgi | |
| 1008 /* Adjust the HDRR offsets in .mdebug and copy the | |
| 1009 line data if it's in its usual 'hole' in the object. | |
| 1010 Makes the new file debuggable with dbx. | |
| 1011 patches up two problems: the absolute file offsets | |
| 1012 in the HDRR record of .mdebug (see /usr/include/syms.h), and | |
| 1013 the ld bug that gets the line table in a hole in the | |
| 1014 elf file rather than in the .mdebug section proper. | |
| 1015 David Anderson. davea@sgi.com Jan 16,1994. */ | |
| 1016 if (n == old_mdebug_index) | |
| 1017 { | |
| 1018 #define MDEBUGADJUST(__ct,__fileaddr) \ | |
| 1019 if (n_phdrr->__ct > 0) \ | |
| 1020 { \ | |
| 1021 n_phdrr->__fileaddr += movement; \ | |
| 1022 } | |
| 1023 | |
| 1024 HDRR * o_phdrr = (HDRR *)((byte *)old_base + OLD_SECTION_H (n).sh_offset); | |
| 1025 HDRR * n_phdrr = (HDRR *)((byte *)new_base + NEW_SECTION_H (nn).sh_offset); | |
| 1026 unsigned movement = new_data2_size; | |
| 1027 | |
| 1028 MDEBUGADJUST (idnMax, cbDnOffset); | |
| 1029 MDEBUGADJUST (ipdMax, cbPdOffset); | |
| 1030 MDEBUGADJUST (isymMax, cbSymOffset); | |
| 1031 MDEBUGADJUST (ioptMax, cbOptOffset); | |
| 1032 MDEBUGADJUST (iauxMax, cbAuxOffset); | |
| 1033 MDEBUGADJUST (issMax, cbSsOffset); | |
| 1034 MDEBUGADJUST (issExtMax, cbSsExtOffset); | |
| 1035 MDEBUGADJUST (ifdMax, cbFdOffset); | |
| 1036 MDEBUGADJUST (crfd, cbRfdOffset); | |
| 1037 MDEBUGADJUST (iextMax, cbExtOffset); | |
| 1038 /* The Line Section, being possible off in a hole of the object, | |
| 1039 requires special handling. */ | |
| 1040 if (n_phdrr->cbLine > 0) | |
| 1041 { | |
| 1042 if (o_phdrr->cbLineOffset > (OLD_SECTION_H (n).sh_offset | |
| 1043 + OLD_SECTION_H (n).sh_size)) | |
| 1044 { | |
| 1045 /* line data is in a hole in elf. do special copy and adjust | |
| 1046 for this ld mistake. | |
| 1047 */ | |
| 1048 n_phdrr->cbLineOffset += movement; | |
| 1049 | |
| 1050 memcpy (n_phdrr->cbLineOffset + new_base, | |
| 1051 o_phdrr->cbLineOffset + old_base, n_phdrr->cbLine); | |
| 1052 } | |
| 1053 else | |
| 1054 { | |
| 1055 /* somehow line data is in .mdebug as it is supposed to be. */ | |
| 1056 MDEBUGADJUST (cbLine, cbLineOffset); | |
| 1057 } | |
| 1058 } | |
| 1059 } | |
| 1060 #endif /* __sgi */ | |
| 1061 | |
| 1062 /* If it is the symbol table, its st_shndx field needs to be patched. */ | |
| 1063 if (NEW_SECTION_H (nn).sh_type == SHT_SYMTAB | |
| 1064 || NEW_SECTION_H (nn).sh_type == SHT_DYNSYM) | |
| 1065 { | |
| 1066 ElfW(Shdr) *spt = &NEW_SECTION_H (nn); | |
| 1067 unsigned int num = spt->sh_size / spt->sh_entsize; | |
| 1068 ElfW(Sym) * sym = (ElfW(Sym) *) (NEW_SECTION_H (nn).sh_offset + | |
| 1069 new_base); | |
| 1070 for (; num--; sym++) | |
| 1071 { | |
| 1072 if ((sym->st_shndx == SHN_UNDEF) | |
| 1073 || (sym->st_shndx == SHN_ABS) | |
| 1074 || (sym->st_shndx == SHN_COMMON)) | |
| 1075 continue; | |
| 1076 | |
| 1077 PATCH_INDEX (sym->st_shndx); | |
| 1078 } | |
| 1079 } | |
| 1080 } | |
| 1081 | |
| 1082 /* Update the symbol values of _edata and _end. */ | |
| 1083 for (n = new_file_h->e_shnum - 1; n; n--) | |
| 1084 { | |
| 1085 byte *symnames; | |
| 1086 ElfW(Sym) *symp, *symendp; | |
| 1087 | |
| 1088 if (NEW_SECTION_H (n).sh_type != SHT_DYNSYM | |
| 1089 && NEW_SECTION_H (n).sh_type != SHT_SYMTAB) | |
| 1090 continue; | |
| 1091 | |
| 1092 symnames = ((byte *) new_base | |
| 1093 + NEW_SECTION_H (NEW_SECTION_H (n).sh_link).sh_offset); | |
| 1094 symp = (ElfW(Sym) *) (NEW_SECTION_H (n).sh_offset + new_base); | |
| 1095 symendp = (ElfW(Sym) *) ((byte *)symp + NEW_SECTION_H (n).sh_size); | |
| 1096 | |
| 1097 for (; symp < symendp; symp ++) | |
| 1098 if (strcmp ((char *) (symnames + symp->st_name), "_end") == 0 | |
| 1099 || strcmp ((char *) (symnames + symp->st_name), "end") == 0 | |
| 1100 || strcmp ((char *) (symnames + symp->st_name), "_edata") == 0 | |
| 1101 || strcmp ((char *) (symnames + symp->st_name), "edata") == 0) | |
| 1102 memcpy (&symp->st_value, &new_bss_addr, sizeof (new_bss_addr)); | |
| 1103 } | |
| 1104 | |
| 1105 /* This loop seeks out relocation sections for the data section, so | |
| 1106 that it can undo relocations performed by the runtime linker. */ | |
| 1107 for (n = new_file_h->e_shnum - 1; n; n--) | |
| 1108 { | |
| 1109 ElfW(Shdr) section = NEW_SECTION_H (n); | |
| 1110 switch (section.sh_type) { | |
| 1111 default: | |
| 1112 break; | |
| 1113 case SHT_REL: | |
| 1114 case SHT_RELA: | |
| 1115 /* This code handles two different size structs, but there should | |
| 1116 be no harm in that provided that r_offset is always the first | |
| 1117 member. */ | |
| 1118 nn = section.sh_info; | |
| 1119 if (!strcmp (old_section_names + NEW_SECTION_H (nn).sh_name, ".data") | |
| 1120 || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name), | |
| 1121 ".sdata") | |
| 1122 #ifdef __sgi | |
| 1123 || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name), | |
| 1124 ".lit4") | |
| 1125 || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name), | |
| 1126 ".lit8") | |
| 1127 || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name), | |
| 1128 ".got") | |
| 1129 #endif | |
| 1130 || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name), | |
| 1131 ".sdata1") | |
| 1132 || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name), | |
| 1133 ".data1")) | |
| 1134 { | |
| 1135 ElfW(Addr) offset = NEW_SECTION_H (nn).sh_addr - | |
| 1136 NEW_SECTION_H (nn).sh_offset; | |
| 1137 caddr_t reloc = old_base + section.sh_offset, end; | |
| 1138 for (end = reloc + section.sh_size; reloc < end; | |
| 1139 reloc += section.sh_entsize) | |
| 1140 { | |
| 1141 ElfW(Addr) addr = ((ElfW(Rel) *) reloc)->r_offset - offset; | |
| 1142 #ifdef __alpha__ | |
| 1143 /* The Alpha ELF binutils currently have a bug that | |
| 1144 sometimes results in relocs that contain all | |
| 1145 zeroes. Work around this for now... */ | |
| 1146 if (((ElfW(Rel) *) reloc)->r_offset == 0) | |
| 1147 continue; | |
| 1148 #endif | |
| 1149 memcpy (new_base + addr, old_base + addr, sizeof(ElfW(Addr))); | |
| 1150 } | |
| 1151 } | |
| 1152 break; | |
| 1153 } | |
| 1154 } | |
| 1155 | |
| 1156 #ifdef UNEXEC_USE_MAP_PRIVATE | |
| 1157 if (lseek (new_file, 0, SEEK_SET) == -1) | |
| 1158 fatal ("Can't rewind (%s): errno %d\n", new_name, errno); | |
| 1159 | |
| 1160 if (write (new_file, new_base, new_file_size) != new_file_size) | |
| 1161 fatal ("Can't write (%s): errno %d\n", new_name, errno); | |
| 1162 #endif | |
| 1163 | |
| 1164 /* Close the files and make the new file executable. */ | |
| 1165 | |
| 1166 if (close (old_file)) | |
| 1167 fatal ("Can't close (%s): errno %d\n", old_name, errno); | |
| 1168 | |
| 1169 if (close (new_file)) | |
| 1170 fatal ("Can't close (%s): errno %d\n", new_name, errno); | |
| 1171 | |
| 1172 if (stat (new_name, &stat_buf) == -1) | |
| 1173 fatal ("Can't stat (%s): errno %d\n", new_name, errno); | |
| 1174 | |
| 1175 n = umask (777); | |
| 1176 umask (n); | |
| 1177 stat_buf.st_mode |= 0111 & ~n; | |
| 1178 if (chmod (new_name, stat_buf.st_mode) == -1) | |
| 1179 fatal ("Can't chmod (%s): errno %d\n", new_name, errno); | |
| 2844 | 1180 return 0; |
| 428 | 1181 } |