Annotation of /trunk/mkinitrd-magellan/busybox/modutils/modutils-24.c
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Sun May 30 11:32:42 2010 UTC (14 years ago) by niro
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Sun May 30 11:32:42 2010 UTC (14 years ago) by niro
File MIME type: text/plain
File size: 96600 byte(s)
-updated to busybox-1.16.1 and enabled blkid/uuid support in default config
1 | niro | 816 | /* vi: set sw=4 ts=4: */ |
2 | /* | ||
3 | * Mini insmod implementation for busybox | ||
4 | * | ||
5 | * This version of insmod supports ARM, CRIS, H8/300, x86, ia64, x86_64, | ||
6 | * m68k, MIPS, PowerPC, S390, SH3/4/5, Sparc, v850e, and x86_64. | ||
7 | * | ||
8 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org> | ||
9 | * and Ron Alder <alder@lineo.com> | ||
10 | * | ||
11 | * Rodney Radford <rradford@mindspring.com> 17-Aug-2004. | ||
12 | * Added x86_64 support. | ||
13 | * | ||
14 | * Miles Bader <miles@gnu.org> added NEC V850E support. | ||
15 | * | ||
16 | * Modified by Bryan Rittmeyer <bryan@ixiacom.com> to support SH4 | ||
17 | * and (theoretically) SH3. I have only tested SH4 in little endian mode. | ||
18 | * | ||
19 | * Modified by Alcove, Julien Gaulmin <julien.gaulmin@alcove.fr> and | ||
20 | * Nicolas Ferre <nicolas.ferre@alcove.fr> to support ARM7TDMI. Only | ||
21 | * very minor changes required to also work with StrongArm and presumably | ||
22 | * all ARM based systems. | ||
23 | * | ||
24 | * Yoshinori Sato <ysato@users.sourceforge.jp> 19-May-2004. | ||
25 | * added Renesas H8/300 support. | ||
26 | * | ||
27 | * Paul Mundt <lethal@linux-sh.org> 08-Aug-2003. | ||
28 | * Integrated support for sh64 (SH-5), from preliminary modutils | ||
29 | * patches from Benedict Gaster <benedict.gaster@superh.com>. | ||
30 | * Currently limited to support for 32bit ABI. | ||
31 | * | ||
32 | * Magnus Damm <damm@opensource.se> 22-May-2002. | ||
33 | * The plt and got code are now using the same structs. | ||
34 | * Added generic linked list code to fully support PowerPC. | ||
35 | * Replaced the mess in arch_apply_relocation() with architecture blocks. | ||
36 | * The arch_create_got() function got cleaned up with architecture blocks. | ||
37 | * These blocks should be easy maintain and sync with obj_xxx.c in modutils. | ||
38 | * | ||
39 | * Magnus Damm <damm@opensource.se> added PowerPC support 20-Feb-2001. | ||
40 | * PowerPC specific code stolen from modutils-2.3.16, | ||
41 | * written by Paul Mackerras, Copyright 1996, 1997 Linux International. | ||
42 | * I've only tested the code on mpc8xx platforms in big-endian mode. | ||
43 | * Did some cleanup and added USE_xxx_ENTRIES... | ||
44 | * | ||
45 | * Quinn Jensen <jensenq@lineo.com> added MIPS support 23-Feb-2001. | ||
46 | * based on modutils-2.4.2 | ||
47 | * MIPS specific support for Elf loading and relocation. | ||
48 | * Copyright 1996, 1997 Linux International. | ||
49 | * Contributed by Ralf Baechle <ralf@gnu.ai.mit.edu> | ||
50 | * | ||
51 | * Based almost entirely on the Linux modutils-2.3.11 implementation. | ||
52 | * Copyright 1996, 1997 Linux International. | ||
53 | * New implementation contributed by Richard Henderson <rth@tamu.edu> | ||
54 | * Based on original work by Bjorn Ekwall <bj0rn@blox.se> | ||
55 | * Restructured (and partly rewritten) by: | ||
56 | * Björn Ekwall <bj0rn@blox.se> February 1999 | ||
57 | * | ||
58 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. | ||
59 | */ | ||
60 | |||
61 | #include "libbb.h" | ||
62 | #include "modutils.h" | ||
63 | #include <libgen.h> | ||
64 | #include <sys/utsname.h> | ||
65 | |||
66 | #if ENABLE_FEATURE_INSMOD_LOADINKMEM | ||
67 | #define LOADBITS 0 | ||
68 | #else | ||
69 | #define LOADBITS 1 | ||
70 | #endif | ||
71 | |||
72 | /* Alpha */ | ||
73 | #if defined(__alpha__) | ||
74 | #define MATCH_MACHINE(x) (x == EM_ALPHA) | ||
75 | #define SHT_RELM SHT_RELA | ||
76 | #define Elf64_RelM Elf64_Rela | ||
77 | #define ELFCLASSM ELFCLASS64 | ||
78 | #endif | ||
79 | |||
80 | /* ARM support */ | ||
81 | #if defined(__arm__) | ||
82 | #define MATCH_MACHINE(x) (x == EM_ARM) | ||
83 | #define SHT_RELM SHT_REL | ||
84 | #define Elf32_RelM Elf32_Rel | ||
85 | #define ELFCLASSM ELFCLASS32 | ||
86 | #define USE_PLT_ENTRIES | ||
87 | #define PLT_ENTRY_SIZE 8 | ||
88 | #define USE_GOT_ENTRIES | ||
89 | #define GOT_ENTRY_SIZE 8 | ||
90 | #define USE_SINGLE | ||
91 | #endif | ||
92 | |||
93 | /* blackfin */ | ||
94 | #if defined(BFIN) | ||
95 | #define MATCH_MACHINE(x) (x == EM_BLACKFIN) | ||
96 | #define SHT_RELM SHT_RELA | ||
97 | #define Elf32_RelM Elf32_Rela | ||
98 | #define ELFCLASSM ELFCLASS32 | ||
99 | #endif | ||
100 | |||
101 | /* CRIS */ | ||
102 | #if defined(__cris__) | ||
103 | #define MATCH_MACHINE(x) (x == EM_CRIS) | ||
104 | #define SHT_RELM SHT_RELA | ||
105 | #define Elf32_RelM Elf32_Rela | ||
106 | #define ELFCLASSM ELFCLASS32 | ||
107 | #ifndef EM_CRIS | ||
108 | #define EM_CRIS 76 | ||
109 | #define R_CRIS_NONE 0 | ||
110 | #define R_CRIS_32 3 | ||
111 | #endif | ||
112 | #endif | ||
113 | |||
114 | /* H8/300 */ | ||
115 | #if defined(__H8300H__) || defined(__H8300S__) | ||
116 | #define MATCH_MACHINE(x) (x == EM_H8_300) | ||
117 | #define SHT_RELM SHT_RELA | ||
118 | #define Elf32_RelM Elf32_Rela | ||
119 | #define ELFCLASSM ELFCLASS32 | ||
120 | #define USE_SINGLE | ||
121 | #define SYMBOL_PREFIX "_" | ||
122 | #endif | ||
123 | |||
124 | /* PA-RISC / HP-PA */ | ||
125 | #if defined(__hppa__) | ||
126 | #define MATCH_MACHINE(x) (x == EM_PARISC) | ||
127 | #define SHT_RELM SHT_RELA | ||
128 | #if defined(__LP64__) | ||
129 | #define Elf64_RelM Elf64_Rela | ||
130 | #define ELFCLASSM ELFCLASS64 | ||
131 | #else | ||
132 | #define Elf32_RelM Elf32_Rela | ||
133 | #define ELFCLASSM ELFCLASS32 | ||
134 | #endif | ||
135 | #endif | ||
136 | |||
137 | /* x86 */ | ||
138 | #if defined(__i386__) | ||
139 | #ifndef EM_486 | ||
140 | #define MATCH_MACHINE(x) (x == EM_386) | ||
141 | #else | ||
142 | #define MATCH_MACHINE(x) (x == EM_386 || x == EM_486) | ||
143 | #endif | ||
144 | #define SHT_RELM SHT_REL | ||
145 | #define Elf32_RelM Elf32_Rel | ||
146 | #define ELFCLASSM ELFCLASS32 | ||
147 | #define USE_GOT_ENTRIES | ||
148 | #define GOT_ENTRY_SIZE 4 | ||
149 | #define USE_SINGLE | ||
150 | #endif | ||
151 | |||
152 | /* IA64, aka Itanium */ | ||
153 | #if defined(__ia64__) | ||
154 | #define MATCH_MACHINE(x) (x == EM_IA_64) | ||
155 | #define SHT_RELM SHT_RELA | ||
156 | #define Elf64_RelM Elf64_Rela | ||
157 | #define ELFCLASSM ELFCLASS64 | ||
158 | #endif | ||
159 | |||
160 | /* m68k */ | ||
161 | #if defined(__mc68000__) | ||
162 | #define MATCH_MACHINE(x) (x == EM_68K) | ||
163 | #define SHT_RELM SHT_RELA | ||
164 | #define Elf32_RelM Elf32_Rela | ||
165 | #define ELFCLASSM ELFCLASS32 | ||
166 | #define USE_GOT_ENTRIES | ||
167 | #define GOT_ENTRY_SIZE 4 | ||
168 | #define USE_SINGLE | ||
169 | #endif | ||
170 | |||
171 | /* Microblaze */ | ||
172 | #if defined(__microblaze__) | ||
173 | #define USE_SINGLE | ||
174 | #include <linux/elf-em.h> | ||
175 | #define MATCH_MACHINE(x) (x == EM_XILINX_MICROBLAZE) | ||
176 | #define SHT_RELM SHT_RELA | ||
177 | #define Elf32_RelM Elf32_Rela | ||
178 | #define ELFCLASSM ELFCLASS32 | ||
179 | #endif | ||
180 | |||
181 | /* MIPS */ | ||
182 | #if defined(__mips__) | ||
183 | #define MATCH_MACHINE(x) (x == EM_MIPS || x == EM_MIPS_RS3_LE) | ||
184 | #define SHT_RELM SHT_REL | ||
185 | #define Elf32_RelM Elf32_Rel | ||
186 | #define ELFCLASSM ELFCLASS32 | ||
187 | /* Account for ELF spec changes. */ | ||
188 | #ifndef EM_MIPS_RS3_LE | ||
189 | #ifdef EM_MIPS_RS4_BE | ||
190 | #define EM_MIPS_RS3_LE EM_MIPS_RS4_BE | ||
191 | #else | ||
192 | #define EM_MIPS_RS3_LE 10 | ||
193 | #endif | ||
194 | #endif /* !EM_MIPS_RS3_LE */ | ||
195 | #define ARCHDATAM "__dbe_table" | ||
196 | #endif | ||
197 | |||
198 | /* Nios II */ | ||
199 | #if defined(__nios2__) | ||
200 | #define MATCH_MACHINE(x) (x == EM_ALTERA_NIOS2) | ||
201 | #define SHT_RELM SHT_RELA | ||
202 | #define Elf32_RelM Elf32_Rela | ||
203 | #define ELFCLASSM ELFCLASS32 | ||
204 | #endif | ||
205 | |||
206 | /* PowerPC */ | ||
207 | #if defined(__powerpc64__) | ||
208 | #define MATCH_MACHINE(x) (x == EM_PPC64) | ||
209 | #define SHT_RELM SHT_RELA | ||
210 | #define Elf64_RelM Elf64_Rela | ||
211 | #define ELFCLASSM ELFCLASS64 | ||
212 | #elif defined(__powerpc__) | ||
213 | #define MATCH_MACHINE(x) (x == EM_PPC) | ||
214 | #define SHT_RELM SHT_RELA | ||
215 | #define Elf32_RelM Elf32_Rela | ||
216 | #define ELFCLASSM ELFCLASS32 | ||
217 | #define USE_PLT_ENTRIES | ||
218 | #define PLT_ENTRY_SIZE 16 | ||
219 | #define USE_PLT_LIST | ||
220 | #define LIST_ARCHTYPE ElfW(Addr) | ||
221 | #define USE_LIST | ||
222 | #define ARCHDATAM "__ftr_fixup" | ||
223 | #endif | ||
224 | |||
225 | /* S390 */ | ||
226 | #if defined(__s390__) | ||
227 | #define MATCH_MACHINE(x) (x == EM_S390) | ||
228 | #define SHT_RELM SHT_RELA | ||
229 | #define Elf32_RelM Elf32_Rela | ||
230 | #define ELFCLASSM ELFCLASS32 | ||
231 | #define USE_PLT_ENTRIES | ||
232 | #define PLT_ENTRY_SIZE 8 | ||
233 | #define USE_GOT_ENTRIES | ||
234 | #define GOT_ENTRY_SIZE 8 | ||
235 | #define USE_SINGLE | ||
236 | #endif | ||
237 | |||
238 | /* SuperH */ | ||
239 | #if defined(__sh__) | ||
240 | #define MATCH_MACHINE(x) (x == EM_SH) | ||
241 | #define SHT_RELM SHT_RELA | ||
242 | #define Elf32_RelM Elf32_Rela | ||
243 | #define ELFCLASSM ELFCLASS32 | ||
244 | #define USE_GOT_ENTRIES | ||
245 | #define GOT_ENTRY_SIZE 4 | ||
246 | #define USE_SINGLE | ||
247 | /* the SH changes have only been tested in =little endian= mode */ | ||
248 | /* I'm not sure about big endian, so let's warn: */ | ||
249 | #if defined(__sh__) && BB_BIG_ENDIAN | ||
250 | # error insmod.c may require changes for use on big endian SH | ||
251 | #endif | ||
252 | /* it may or may not work on the SH1/SH2... Error on those also */ | ||
253 | #if ((!(defined(__SH3__) || defined(__SH4__) || defined(__SH5__)))) && (defined(__sh__)) | ||
254 | #error insmod.c may require changes for SH1 or SH2 use | ||
255 | #endif | ||
256 | #endif | ||
257 | |||
258 | /* Sparc */ | ||
259 | #if defined(__sparc__) | ||
260 | #define MATCH_MACHINE(x) (x == EM_SPARC) | ||
261 | #define SHT_RELM SHT_RELA | ||
262 | #define Elf32_RelM Elf32_Rela | ||
263 | #define ELFCLASSM ELFCLASS32 | ||
264 | #endif | ||
265 | |||
266 | /* v850e */ | ||
267 | #if defined(__v850e__) | ||
268 | #define MATCH_MACHINE(x) ((x) == EM_V850 || (x) == EM_CYGNUS_V850) | ||
269 | #define SHT_RELM SHT_RELA | ||
270 | #define Elf32_RelM Elf32_Rela | ||
271 | #define ELFCLASSM ELFCLASS32 | ||
272 | #define USE_PLT_ENTRIES | ||
273 | #define PLT_ENTRY_SIZE 8 | ||
274 | #define USE_SINGLE | ||
275 | #ifndef EM_CYGNUS_V850 /* grumble */ | ||
276 | #define EM_CYGNUS_V850 0x9080 | ||
277 | #endif | ||
278 | #define SYMBOL_PREFIX "_" | ||
279 | #endif | ||
280 | |||
281 | /* X86_64 */ | ||
282 | #if defined(__x86_64__) | ||
283 | #define MATCH_MACHINE(x) (x == EM_X86_64) | ||
284 | #define SHT_RELM SHT_RELA | ||
285 | #define USE_GOT_ENTRIES | ||
286 | #define GOT_ENTRY_SIZE 8 | ||
287 | #define USE_SINGLE | ||
288 | #define Elf64_RelM Elf64_Rela | ||
289 | #define ELFCLASSM ELFCLASS64 | ||
290 | #endif | ||
291 | |||
292 | #ifndef SHT_RELM | ||
293 | #error Sorry, but insmod.c does not yet support this architecture... | ||
294 | #endif | ||
295 | |||
296 | |||
297 | //---------------------------------------------------------------------------- | ||
298 | //--------modutils module.h, lines 45-242 | ||
299 | //---------------------------------------------------------------------------- | ||
300 | |||
301 | /* Definitions for the Linux module syscall interface. | ||
302 | Copyright 1996, 1997 Linux International. | ||
303 | |||
304 | Contributed by Richard Henderson <rth@tamu.edu> | ||
305 | |||
306 | This file is part of the Linux modutils. | ||
307 | |||
308 | This program is free software; you can redistribute it and/or modify it | ||
309 | under the terms of the GNU General Public License as published by the | ||
310 | Free Software Foundation; either version 2 of the License, or (at your | ||
311 | option) any later version. | ||
312 | |||
313 | This program is distributed in the hope that it will be useful, but | ||
314 | WITHOUT ANY WARRANTY; without even the implied warranty of | ||
315 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
316 | General Public License for more details. | ||
317 | |||
318 | You should have received a copy of the GNU General Public License | ||
319 | along with this program; if not, write to the Free Software Foundation, | ||
320 | Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | ||
321 | |||
322 | |||
323 | #ifndef MODUTILS_MODULE_H | ||
324 | |||
325 | /*======================================================================*/ | ||
326 | /* For sizeof() which are related to the module platform and not to the | ||
327 | environment isnmod is running in, use sizeof_xx instead of sizeof(xx). */ | ||
328 | |||
329 | #define tgt_sizeof_char sizeof(char) | ||
330 | #define tgt_sizeof_short sizeof(short) | ||
331 | #define tgt_sizeof_int sizeof(int) | ||
332 | #define tgt_sizeof_long sizeof(long) | ||
333 | #define tgt_sizeof_char_p sizeof(char *) | ||
334 | #define tgt_sizeof_void_p sizeof(void *) | ||
335 | #define tgt_long long | ||
336 | |||
337 | #if defined(__sparc__) && !defined(__sparc_v9__) && defined(ARCH_sparc64) | ||
338 | #undef tgt_sizeof_long | ||
339 | #undef tgt_sizeof_char_p | ||
340 | #undef tgt_sizeof_void_p | ||
341 | #undef tgt_long | ||
342 | enum { | ||
343 | tgt_sizeof_long = 8, | ||
344 | tgt_sizeof_char_p = 8, | ||
345 | tgt_sizeof_void_p = 8 | ||
346 | }; | ||
347 | #define tgt_long long long | ||
348 | #endif | ||
349 | |||
350 | /*======================================================================*/ | ||
351 | /* The structures used in Linux 2.1. */ | ||
352 | |||
353 | /* Note: new_module_symbol does not use tgt_long intentionally */ | ||
354 | struct new_module_symbol { | ||
355 | unsigned long value; | ||
356 | unsigned long name; | ||
357 | }; | ||
358 | |||
359 | struct new_module_persist; | ||
360 | |||
361 | struct new_module_ref { | ||
362 | unsigned tgt_long dep; /* kernel addresses */ | ||
363 | unsigned tgt_long ref; | ||
364 | unsigned tgt_long next_ref; | ||
365 | }; | ||
366 | |||
367 | struct new_module { | ||
368 | unsigned tgt_long size_of_struct; /* == sizeof(module) */ | ||
369 | unsigned tgt_long next; | ||
370 | unsigned tgt_long name; | ||
371 | unsigned tgt_long size; | ||
372 | |||
373 | tgt_long usecount; | ||
374 | unsigned tgt_long flags; /* AUTOCLEAN et al */ | ||
375 | |||
376 | unsigned nsyms; | ||
377 | unsigned ndeps; | ||
378 | |||
379 | unsigned tgt_long syms; | ||
380 | unsigned tgt_long deps; | ||
381 | unsigned tgt_long refs; | ||
382 | unsigned tgt_long init; | ||
383 | unsigned tgt_long cleanup; | ||
384 | unsigned tgt_long ex_table_start; | ||
385 | unsigned tgt_long ex_table_end; | ||
386 | #ifdef __alpha__ | ||
387 | unsigned tgt_long gp; | ||
388 | #endif | ||
389 | /* Everything after here is extension. */ | ||
390 | unsigned tgt_long persist_start; | ||
391 | unsigned tgt_long persist_end; | ||
392 | unsigned tgt_long can_unload; | ||
393 | unsigned tgt_long runsize; | ||
394 | const char *kallsyms_start; /* All symbols for kernel debugging */ | ||
395 | const char *kallsyms_end; | ||
396 | const char *archdata_start; /* arch specific data for module */ | ||
397 | const char *archdata_end; | ||
398 | const char *kernel_data; /* Reserved for kernel internal use */ | ||
399 | }; | ||
400 | |||
401 | #ifdef ARCHDATAM | ||
402 | #define ARCHDATA_SEC_NAME ARCHDATAM | ||
403 | #else | ||
404 | #define ARCHDATA_SEC_NAME "__archdata" | ||
405 | #endif | ||
406 | #define KALLSYMS_SEC_NAME "__kallsyms" | ||
407 | |||
408 | |||
409 | struct new_module_info { | ||
410 | unsigned long addr; | ||
411 | unsigned long size; | ||
412 | unsigned long flags; | ||
413 | long usecount; | ||
414 | }; | ||
415 | |||
416 | /* Bits of module.flags. */ | ||
417 | enum { | ||
418 | NEW_MOD_RUNNING = 1, | ||
419 | NEW_MOD_DELETED = 2, | ||
420 | NEW_MOD_AUTOCLEAN = 4, | ||
421 | NEW_MOD_VISITED = 8, | ||
422 | NEW_MOD_USED_ONCE = 16 | ||
423 | }; | ||
424 | |||
425 | int init_module(const char *name, const struct new_module *); | ||
426 | int query_module(const char *name, int which, void *buf, | ||
427 | size_t bufsize, size_t *ret); | ||
428 | |||
429 | /* Values for query_module's which. */ | ||
430 | enum { | ||
431 | QM_MODULES = 1, | ||
432 | QM_DEPS = 2, | ||
433 | QM_REFS = 3, | ||
434 | QM_SYMBOLS = 4, | ||
435 | QM_INFO = 5 | ||
436 | }; | ||
437 | |||
438 | /*======================================================================*/ | ||
439 | /* The system calls unchanged between 2.0 and 2.1. */ | ||
440 | |||
441 | unsigned long create_module(const char *, size_t); | ||
442 | int delete_module(const char *module, unsigned int flags); | ||
443 | |||
444 | |||
445 | #endif /* module.h */ | ||
446 | |||
447 | //---------------------------------------------------------------------------- | ||
448 | //--------end of modutils module.h | ||
449 | //---------------------------------------------------------------------------- | ||
450 | |||
451 | |||
452 | |||
453 | //---------------------------------------------------------------------------- | ||
454 | //--------modutils obj.h, lines 253-462 | ||
455 | //---------------------------------------------------------------------------- | ||
456 | |||
457 | /* Elf object file loading and relocation routines. | ||
458 | Copyright 1996, 1997 Linux International. | ||
459 | |||
460 | Contributed by Richard Henderson <rth@tamu.edu> | ||
461 | |||
462 | This file is part of the Linux modutils. | ||
463 | |||
464 | This program is free software; you can redistribute it and/or modify it | ||
465 | under the terms of the GNU General Public License as published by the | ||
466 | Free Software Foundation; either version 2 of the License, or (at your | ||
467 | option) any later version. | ||
468 | |||
469 | This program is distributed in the hope that it will be useful, but | ||
470 | WITHOUT ANY WARRANTY; without even the implied warranty of | ||
471 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
472 | General Public License for more details. | ||
473 | |||
474 | You should have received a copy of the GNU General Public License | ||
475 | along with this program; if not, write to the Free Software Foundation, | ||
476 | Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | ||
477 | |||
478 | |||
479 | #ifndef MODUTILS_OBJ_H | ||
480 | |||
481 | /* The relocatable object is manipulated using elfin types. */ | ||
482 | |||
483 | #include <elf.h> | ||
484 | #include <endian.h> | ||
485 | |||
486 | #ifndef ElfW | ||
487 | # if ELFCLASSM == ELFCLASS32 | ||
488 | # define ElfW(x) Elf32_ ## x | ||
489 | # define ELFW(x) ELF32_ ## x | ||
490 | # else | ||
491 | # define ElfW(x) Elf64_ ## x | ||
492 | # define ELFW(x) ELF64_ ## x | ||
493 | # endif | ||
494 | #endif | ||
495 | |||
496 | /* For some reason this is missing from some ancient C libraries.... */ | ||
497 | #ifndef ELF32_ST_INFO | ||
498 | # define ELF32_ST_INFO(bind, type) (((bind) << 4) + ((type) & 0xf)) | ||
499 | #endif | ||
500 | |||
501 | #ifndef ELF64_ST_INFO | ||
502 | # define ELF64_ST_INFO(bind, type) (((bind) << 4) + ((type) & 0xf)) | ||
503 | #endif | ||
504 | |||
505 | #define ELF_ST_BIND(info) ELFW(ST_BIND)(info) | ||
506 | #define ELF_ST_TYPE(info) ELFW(ST_TYPE)(info) | ||
507 | #define ELF_ST_INFO(bind, type) ELFW(ST_INFO)(bind, type) | ||
508 | #define ELF_R_TYPE(val) ELFW(R_TYPE)(val) | ||
509 | #define ELF_R_SYM(val) ELFW(R_SYM)(val) | ||
510 | |||
511 | struct obj_string_patch; | ||
512 | struct obj_symbol_patch; | ||
513 | |||
514 | niro | 984 | struct obj_section { |
515 | niro | 816 | ElfW(Shdr) header; |
516 | const char *name; | ||
517 | char *contents; | ||
518 | struct obj_section *load_next; | ||
519 | int idx; | ||
520 | }; | ||
521 | |||
522 | niro | 984 | struct obj_symbol { |
523 | niro | 816 | struct obj_symbol *next; /* hash table link */ |
524 | const char *name; | ||
525 | unsigned long value; | ||
526 | unsigned long size; | ||
527 | int secidx; /* the defining section index/module */ | ||
528 | int info; | ||
529 | int ksymidx; /* for export to the kernel symtab */ | ||
530 | int referenced; /* actually used in the link */ | ||
531 | }; | ||
532 | |||
533 | /* Hardcode the hash table size. We shouldn't be needing so many | ||
534 | symbols that we begin to degrade performance, and we get a big win | ||
535 | by giving the compiler a constant divisor. */ | ||
536 | |||
537 | #define HASH_BUCKETS 521 | ||
538 | |||
539 | struct obj_file { | ||
540 | ElfW(Ehdr) header; | ||
541 | ElfW(Addr) baseaddr; | ||
542 | struct obj_section **sections; | ||
543 | struct obj_section *load_order; | ||
544 | struct obj_section **load_order_search_start; | ||
545 | struct obj_string_patch *string_patches; | ||
546 | struct obj_symbol_patch *symbol_patches; | ||
547 | niro | 984 | int (*symbol_cmp)(const char *, const char *); /* cant be FAST_FUNC */ |
548 | unsigned long (*symbol_hash)(const char *) FAST_FUNC; | ||
549 | niro | 816 | unsigned long local_symtab_size; |
550 | struct obj_symbol **local_symtab; | ||
551 | struct obj_symbol *symtab[HASH_BUCKETS]; | ||
552 | }; | ||
553 | |||
554 | enum obj_reloc { | ||
555 | obj_reloc_ok, | ||
556 | obj_reloc_overflow, | ||
557 | obj_reloc_dangerous, | ||
558 | obj_reloc_unhandled | ||
559 | }; | ||
560 | |||
561 | struct obj_string_patch { | ||
562 | struct obj_string_patch *next; | ||
563 | int reloc_secidx; | ||
564 | ElfW(Addr) reloc_offset; | ||
565 | ElfW(Addr) string_offset; | ||
566 | }; | ||
567 | |||
568 | struct obj_symbol_patch { | ||
569 | struct obj_symbol_patch *next; | ||
570 | int reloc_secidx; | ||
571 | ElfW(Addr) reloc_offset; | ||
572 | struct obj_symbol *sym; | ||
573 | }; | ||
574 | |||
575 | |||
576 | /* Generic object manipulation routines. */ | ||
577 | |||
578 | niro | 984 | static unsigned long FAST_FUNC obj_elf_hash(const char *); |
579 | niro | 816 | |
580 | static unsigned long obj_elf_hash_n(const char *, unsigned long len); | ||
581 | |||
582 | static struct obj_symbol *obj_find_symbol(struct obj_file *f, | ||
583 | niro | 984 | const char *name); |
584 | niro | 816 | |
585 | static ElfW(Addr) obj_symbol_final_value(struct obj_file *f, | ||
586 | niro | 984 | struct obj_symbol *sym); |
587 | niro | 816 | |
588 | #if ENABLE_FEATURE_INSMOD_VERSION_CHECKING | ||
589 | static void obj_set_symbol_compare(struct obj_file *f, | ||
590 | niro | 984 | int (*cmp)(const char *, const char *), |
591 | unsigned long (*hash)(const char *) FAST_FUNC); | ||
592 | niro | 816 | #endif |
593 | |||
594 | static struct obj_section *obj_find_section(struct obj_file *f, | ||
595 | niro | 984 | const char *name); |
596 | niro | 816 | |
597 | static void obj_insert_section_load_order(struct obj_file *f, | ||
598 | niro | 984 | struct obj_section *sec); |
599 | niro | 816 | |
600 | static struct obj_section *obj_create_alloced_section(struct obj_file *f, | ||
601 | niro | 984 | const char *name, |
602 | unsigned long align, | ||
603 | unsigned long size); | ||
604 | niro | 816 | |
605 | static struct obj_section *obj_create_alloced_section_first(struct obj_file *f, | ||
606 | niro | 984 | const char *name, |
607 | unsigned long align, | ||
608 | unsigned long size); | ||
609 | niro | 816 | |
610 | static void *obj_extend_section(struct obj_section *sec, unsigned long more); | ||
611 | |||
612 | static void obj_string_patch(struct obj_file *f, int secidx, ElfW(Addr) offset, | ||
613 | niro | 984 | const char *string); |
614 | niro | 816 | |
615 | static void obj_symbol_patch(struct obj_file *f, int secidx, ElfW(Addr) offset, | ||
616 | niro | 984 | struct obj_symbol *sym); |
617 | niro | 816 | |
618 | static void obj_check_undefineds(struct obj_file *f); | ||
619 | |||
620 | static void obj_allocate_commons(struct obj_file *f); | ||
621 | |||
622 | static unsigned long obj_load_size(struct obj_file *f); | ||
623 | |||
624 | static int obj_relocate(struct obj_file *f, ElfW(Addr) base); | ||
625 | |||
626 | niro | 984 | #if !LOADBITS |
627 | #define obj_load(image, image_size, loadprogbits) \ | ||
628 | obj_load(image, image_size) | ||
629 | #endif | ||
630 | static struct obj_file *obj_load(char *image, size_t image_size, int loadprogbits); | ||
631 | niro | 816 | |
632 | static int obj_create_image(struct obj_file *f, char *image); | ||
633 | |||
634 | /* Architecture specific manipulation routines. */ | ||
635 | |||
636 | static struct obj_file *arch_new_file(void); | ||
637 | |||
638 | static struct obj_section *arch_new_section(void); | ||
639 | |||
640 | static struct obj_symbol *arch_new_symbol(void); | ||
641 | |||
642 | static enum obj_reloc arch_apply_relocation(struct obj_file *f, | ||
643 | niro | 984 | struct obj_section *targsec, |
644 | /*struct obj_section *symsec,*/ | ||
645 | struct obj_symbol *sym, | ||
646 | ElfW(RelM) *rel, ElfW(Addr) value); | ||
647 | niro | 816 | |
648 | static void arch_create_got(struct obj_file *f); | ||
649 | #if ENABLE_FEATURE_CHECK_TAINTED_MODULE | ||
650 | static int obj_gpl_license(struct obj_file *f, const char **license); | ||
651 | niro | 984 | #endif |
652 | niro | 816 | #endif /* obj.h */ |
653 | //---------------------------------------------------------------------------- | ||
654 | //--------end of modutils obj.h | ||
655 | //---------------------------------------------------------------------------- | ||
656 | |||
657 | |||
658 | /* SPFX is always a string, so it can be concatenated to string constants. */ | ||
659 | #ifdef SYMBOL_PREFIX | ||
660 | #define SPFX SYMBOL_PREFIX | ||
661 | #else | ||
662 | #define SPFX "" | ||
663 | #endif | ||
664 | |||
665 | enum { STRVERSIONLEN = 64 }; | ||
666 | |||
667 | /*======================================================================*/ | ||
668 | |||
669 | #define flag_force_load (option_mask32 & INSMOD_OPT_FORCE) | ||
670 | #define flag_autoclean (option_mask32 & INSMOD_OPT_KERNELD) | ||
671 | #define flag_verbose (option_mask32 & INSMOD_OPT_VERBOSE) | ||
672 | #define flag_quiet (option_mask32 & INSMOD_OPT_SILENT) | ||
673 | #define flag_noexport (option_mask32 & INSMOD_OPT_NO_EXPORT) | ||
674 | #define flag_print_load_map (option_mask32 & INSMOD_OPT_PRINT_MAP) | ||
675 | |||
676 | /*======================================================================*/ | ||
677 | |||
678 | #if defined(USE_LIST) | ||
679 | |||
680 | niro | 984 | struct arch_list_entry { |
681 | niro | 816 | struct arch_list_entry *next; |
682 | LIST_ARCHTYPE addend; | ||
683 | int offset; | ||
684 | int inited : 1; | ||
685 | }; | ||
686 | |||
687 | #endif | ||
688 | |||
689 | #if defined(USE_SINGLE) | ||
690 | |||
691 | niro | 984 | struct arch_single_entry { |
692 | niro | 816 | int offset; |
693 | int inited : 1; | ||
694 | int allocated : 1; | ||
695 | }; | ||
696 | |||
697 | #endif | ||
698 | |||
699 | #if defined(__mips__) | ||
700 | niro | 984 | struct mips_hi16 { |
701 | niro | 816 | struct mips_hi16 *next; |
702 | ElfW(Addr) *addr; | ||
703 | ElfW(Addr) value; | ||
704 | }; | ||
705 | #endif | ||
706 | |||
707 | struct arch_file { | ||
708 | struct obj_file root; | ||
709 | #if defined(USE_PLT_ENTRIES) | ||
710 | struct obj_section *plt; | ||
711 | #endif | ||
712 | #if defined(USE_GOT_ENTRIES) | ||
713 | struct obj_section *got; | ||
714 | #endif | ||
715 | #if defined(__mips__) | ||
716 | struct mips_hi16 *mips_hi16_list; | ||
717 | #endif | ||
718 | }; | ||
719 | |||
720 | struct arch_symbol { | ||
721 | struct obj_symbol root; | ||
722 | #if defined(USE_PLT_ENTRIES) | ||
723 | #if defined(USE_PLT_LIST) | ||
724 | struct arch_list_entry *pltent; | ||
725 | #else | ||
726 | struct arch_single_entry pltent; | ||
727 | #endif | ||
728 | #endif | ||
729 | #if defined(USE_GOT_ENTRIES) | ||
730 | struct arch_single_entry gotent; | ||
731 | #endif | ||
732 | }; | ||
733 | |||
734 | |||
735 | struct external_module { | ||
736 | const char *name; | ||
737 | ElfW(Addr) addr; | ||
738 | int used; | ||
739 | size_t nsyms; | ||
740 | struct new_module_symbol *syms; | ||
741 | }; | ||
742 | |||
743 | static struct new_module_symbol *ksyms; | ||
744 | static size_t nksyms; | ||
745 | |||
746 | static struct external_module *ext_modules; | ||
747 | static int n_ext_modules; | ||
748 | static int n_ext_modules_used; | ||
749 | |||
750 | /*======================================================================*/ | ||
751 | |||
752 | |||
753 | static struct obj_file *arch_new_file(void) | ||
754 | { | ||
755 | struct arch_file *f; | ||
756 | f = xzalloc(sizeof(*f)); | ||
757 | return &f->root; /* it's a first member */ | ||
758 | } | ||
759 | |||
760 | static struct obj_section *arch_new_section(void) | ||
761 | { | ||
762 | return xzalloc(sizeof(struct obj_section)); | ||
763 | } | ||
764 | |||
765 | static struct obj_symbol *arch_new_symbol(void) | ||
766 | { | ||
767 | struct arch_symbol *sym; | ||
768 | sym = xzalloc(sizeof(*sym)); | ||
769 | return &sym->root; | ||
770 | } | ||
771 | |||
772 | static enum obj_reloc | ||
773 | arch_apply_relocation(struct obj_file *f, | ||
774 | niro | 984 | struct obj_section *targsec, |
775 | /*struct obj_section *symsec,*/ | ||
776 | struct obj_symbol *sym, | ||
777 | ElfW(RelM) *rel, ElfW(Addr) v) | ||
778 | niro | 816 | { |
779 | #if defined(__arm__) || defined(__i386__) || defined(__mc68000__) \ | ||
780 | || defined(__sh__) || defined(__s390__) || defined(__x86_64__) \ | ||
781 | || defined(__powerpc__) || defined(__mips__) | ||
782 | struct arch_file *ifile = (struct arch_file *) f; | ||
783 | #endif | ||
784 | enum obj_reloc ret = obj_reloc_ok; | ||
785 | ElfW(Addr) *loc = (ElfW(Addr) *) (targsec->contents + rel->r_offset); | ||
786 | #if defined(__arm__) || defined(__H8300H__) || defined(__H8300S__) \ | ||
787 | || defined(__i386__) || defined(__mc68000__) || defined(__microblaze__) \ | ||
788 | || defined(__mips__) || defined(__nios2__) || defined(__powerpc__) \ | ||
789 | || defined(__s390__) || defined(__sh__) || defined(__x86_64__) | ||
790 | ElfW(Addr) dot = targsec->header.sh_addr + rel->r_offset; | ||
791 | #endif | ||
792 | #if defined(USE_GOT_ENTRIES) || defined(USE_PLT_ENTRIES) | ||
793 | struct arch_symbol *isym = (struct arch_symbol *) sym; | ||
794 | #endif | ||
795 | #if defined(__arm__) || defined(__i386__) || defined(__mc68000__) \ | ||
796 | || defined(__sh__) || defined(__s390__) | ||
797 | #if defined(USE_GOT_ENTRIES) | ||
798 | ElfW(Addr) got = ifile->got ? ifile->got->header.sh_addr : 0; | ||
799 | #endif | ||
800 | #endif | ||
801 | #if defined(USE_PLT_ENTRIES) | ||
802 | ElfW(Addr) plt = ifile->plt ? ifile->plt->header.sh_addr : 0; | ||
803 | unsigned long *ip; | ||
804 | # if defined(USE_PLT_LIST) | ||
805 | struct arch_list_entry *pe; | ||
806 | # else | ||
807 | struct arch_single_entry *pe; | ||
808 | # endif | ||
809 | #endif | ||
810 | |||
811 | switch (ELF_R_TYPE(rel->r_info)) { | ||
812 | |||
813 | #if defined(__arm__) | ||
814 | |||
815 | case R_ARM_NONE: | ||
816 | break; | ||
817 | |||
818 | case R_ARM_ABS32: | ||
819 | *loc += v; | ||
820 | break; | ||
821 | |||
822 | case R_ARM_GOT32: | ||
823 | goto bb_use_got; | ||
824 | |||
825 | case R_ARM_GOTPC: | ||
826 | /* relative reloc, always to _GLOBAL_OFFSET_TABLE_ | ||
827 | * (which is .got) similar to branch, | ||
828 | * but is full 32 bits relative */ | ||
829 | |||
830 | *loc += got - dot; | ||
831 | break; | ||
832 | |||
833 | case R_ARM_PC24: | ||
834 | case R_ARM_PLT32: | ||
835 | goto bb_use_plt; | ||
836 | |||
837 | case R_ARM_GOTOFF: /* address relative to the got */ | ||
838 | *loc += v - got; | ||
839 | break; | ||
840 | |||
841 | #elif defined(__cris__) | ||
842 | |||
843 | case R_CRIS_NONE: | ||
844 | break; | ||
845 | |||
846 | case R_CRIS_32: | ||
847 | /* CRIS keeps the relocation value in the r_addend field and | ||
848 | * should not use whats in *loc at all | ||
849 | */ | ||
850 | *loc = v; | ||
851 | break; | ||
852 | |||
853 | #elif defined(__H8300H__) || defined(__H8300S__) | ||
854 | |||
855 | case R_H8_DIR24R8: | ||
856 | loc = (ElfW(Addr) *)((ElfW(Addr))loc - 1); | ||
857 | *loc = (*loc & 0xff000000) | ((*loc & 0xffffff) + v); | ||
858 | break; | ||
859 | case R_H8_DIR24A8: | ||
860 | *loc += v; | ||
861 | break; | ||
862 | case R_H8_DIR32: | ||
863 | case R_H8_DIR32A16: | ||
864 | *loc += v; | ||
865 | break; | ||
866 | case R_H8_PCREL16: | ||
867 | v -= dot + 2; | ||
868 | if ((ElfW(Sword))v > 0x7fff || | ||
869 | (ElfW(Sword))v < -(ElfW(Sword))0x8000) | ||
870 | ret = obj_reloc_overflow; | ||
871 | else | ||
872 | *(unsigned short *)loc = v; | ||
873 | break; | ||
874 | case R_H8_PCREL8: | ||
875 | v -= dot + 1; | ||
876 | if ((ElfW(Sword))v > 0x7f || | ||
877 | (ElfW(Sword))v < -(ElfW(Sword))0x80) | ||
878 | ret = obj_reloc_overflow; | ||
879 | else | ||
880 | *(unsigned char *)loc = v; | ||
881 | break; | ||
882 | |||
883 | #elif defined(__i386__) | ||
884 | |||
885 | case R_386_NONE: | ||
886 | break; | ||
887 | |||
888 | case R_386_32: | ||
889 | *loc += v; | ||
890 | break; | ||
891 | |||
892 | case R_386_PLT32: | ||
893 | case R_386_PC32: | ||
894 | case R_386_GOTOFF: | ||
895 | *loc += v - dot; | ||
896 | break; | ||
897 | |||
898 | case R_386_GLOB_DAT: | ||
899 | case R_386_JMP_SLOT: | ||
900 | *loc = v; | ||
901 | break; | ||
902 | |||
903 | case R_386_RELATIVE: | ||
904 | *loc += f->baseaddr; | ||
905 | break; | ||
906 | |||
907 | case R_386_GOTPC: | ||
908 | *loc += got - dot; | ||
909 | break; | ||
910 | |||
911 | case R_386_GOT32: | ||
912 | goto bb_use_got; | ||
913 | break; | ||
914 | |||
915 | #elif defined(__microblaze__) | ||
916 | case R_MICROBLAZE_NONE: | ||
917 | case R_MICROBLAZE_64_NONE: | ||
918 | case R_MICROBLAZE_32_SYM_OP_SYM: | ||
919 | case R_MICROBLAZE_32_PCREL: | ||
920 | break; | ||
921 | |||
922 | case R_MICROBLAZE_64_PCREL: { | ||
923 | /* dot is the address of the current instruction. | ||
924 | * v is the target symbol address. | ||
925 | * So we need to extract the offset in the code, | ||
926 | * adding v, then subtrating the current address | ||
927 | * of this instruction. | ||
928 | * Ex: "IMM 0xFFFE bralid 0x0000" = "bralid 0xFFFE0000" | ||
929 | */ | ||
930 | |||
931 | /* Get split offset stored in code */ | ||
932 | unsigned int temp = (loc[0] & 0xFFFF) << 16 | | ||
933 | (loc[1] & 0xFFFF); | ||
934 | |||
935 | /* Adjust relative offset. -4 adjustment required | ||
936 | * because dot points to the IMM insn, but branch | ||
937 | * is computed relative to the branch instruction itself. | ||
938 | */ | ||
939 | temp += v - dot - 4; | ||
940 | |||
941 | /* Store back into code */ | ||
942 | loc[0] = (loc[0] & 0xFFFF0000) | temp >> 16; | ||
943 | loc[1] = (loc[1] & 0xFFFF0000) | (temp & 0xFFFF); | ||
944 | |||
945 | break; | ||
946 | } | ||
947 | |||
948 | case R_MICROBLAZE_32: | ||
949 | *loc += v; | ||
950 | break; | ||
951 | |||
952 | case R_MICROBLAZE_64: { | ||
953 | /* Get split pointer stored in code */ | ||
954 | unsigned int temp1 = (loc[0] & 0xFFFF) << 16 | | ||
955 | (loc[1] & 0xFFFF); | ||
956 | |||
957 | /* Add reloc offset */ | ||
958 | temp1+=v; | ||
959 | |||
960 | /* Store back into code */ | ||
961 | loc[0] = (loc[0] & 0xFFFF0000) | temp1 >> 16; | ||
962 | loc[1] = (loc[1] & 0xFFFF0000) | (temp1 & 0xFFFF); | ||
963 | |||
964 | break; | ||
965 | } | ||
966 | |||
967 | case R_MICROBLAZE_32_PCREL_LO: | ||
968 | case R_MICROBLAZE_32_LO: | ||
969 | case R_MICROBLAZE_SRO32: | ||
970 | case R_MICROBLAZE_SRW32: | ||
971 | ret = obj_reloc_unhandled; | ||
972 | break; | ||
973 | |||
974 | #elif defined(__mc68000__) | ||
975 | |||
976 | case R_68K_NONE: | ||
977 | break; | ||
978 | |||
979 | case R_68K_32: | ||
980 | *loc += v; | ||
981 | break; | ||
982 | |||
983 | case R_68K_8: | ||
984 | if (v > 0xff) { | ||
985 | ret = obj_reloc_overflow; | ||
986 | } | ||
987 | *(char *)loc = v; | ||
988 | break; | ||
989 | |||
990 | case R_68K_16: | ||
991 | if (v > 0xffff) { | ||
992 | ret = obj_reloc_overflow; | ||
993 | } | ||
994 | *(short *)loc = v; | ||
995 | break; | ||
996 | |||
997 | case R_68K_PC8: | ||
998 | v -= dot; | ||
999 | niro | 984 | if ((ElfW(Sword))v > 0x7f |
1000 | || (ElfW(Sword))v < -(ElfW(Sword))0x80 | ||
1001 | ) { | ||
1002 | niro | 816 | ret = obj_reloc_overflow; |
1003 | } | ||
1004 | *(char *)loc = v; | ||
1005 | break; | ||
1006 | |||
1007 | case R_68K_PC16: | ||
1008 | v -= dot; | ||
1009 | niro | 984 | if ((ElfW(Sword))v > 0x7fff |
1010 | || (ElfW(Sword))v < -(ElfW(Sword))0x8000 | ||
1011 | ) { | ||
1012 | niro | 816 | ret = obj_reloc_overflow; |
1013 | } | ||
1014 | *(short *)loc = v; | ||
1015 | break; | ||
1016 | |||
1017 | case R_68K_PC32: | ||
1018 | *(int *)loc = v - dot; | ||
1019 | break; | ||
1020 | |||
1021 | case R_68K_GLOB_DAT: | ||
1022 | case R_68K_JMP_SLOT: | ||
1023 | *loc = v; | ||
1024 | break; | ||
1025 | |||
1026 | case R_68K_RELATIVE: | ||
1027 | *(int *)loc += f->baseaddr; | ||
1028 | break; | ||
1029 | |||
1030 | case R_68K_GOT32: | ||
1031 | goto bb_use_got; | ||
1032 | |||
1033 | # ifdef R_68K_GOTOFF | ||
1034 | case R_68K_GOTOFF: | ||
1035 | *loc += v - got; | ||
1036 | break; | ||
1037 | # endif | ||
1038 | |||
1039 | #elif defined(__mips__) | ||
1040 | |||
1041 | case R_MIPS_NONE: | ||
1042 | break; | ||
1043 | |||
1044 | case R_MIPS_32: | ||
1045 | *loc += v; | ||
1046 | break; | ||
1047 | |||
1048 | case R_MIPS_26: | ||
1049 | if (v % 4) | ||
1050 | ret = obj_reloc_dangerous; | ||
1051 | if ((v & 0xf0000000) != ((dot + 4) & 0xf0000000)) | ||
1052 | ret = obj_reloc_overflow; | ||
1053 | *loc = | ||
1054 | (*loc & ~0x03ffffff) | ((*loc + (v >> 2)) & | ||
1055 | 0x03ffffff); | ||
1056 | break; | ||
1057 | |||
1058 | case R_MIPS_HI16: | ||
1059 | { | ||
1060 | struct mips_hi16 *n; | ||
1061 | |||
1062 | /* We cannot relocate this one now because we don't know the value | ||
1063 | of the carry we need to add. Save the information, and let LO16 | ||
1064 | do the actual relocation. */ | ||
1065 | n = xmalloc(sizeof *n); | ||
1066 | n->addr = loc; | ||
1067 | n->value = v; | ||
1068 | n->next = ifile->mips_hi16_list; | ||
1069 | ifile->mips_hi16_list = n; | ||
1070 | break; | ||
1071 | } | ||
1072 | |||
1073 | case R_MIPS_LO16: | ||
1074 | { | ||
1075 | unsigned long insnlo = *loc; | ||
1076 | ElfW(Addr) val, vallo; | ||
1077 | |||
1078 | /* Sign extend the addend we extract from the lo insn. */ | ||
1079 | vallo = ((insnlo & 0xffff) ^ 0x8000) - 0x8000; | ||
1080 | |||
1081 | if (ifile->mips_hi16_list != NULL) { | ||
1082 | struct mips_hi16 *l; | ||
1083 | |||
1084 | l = ifile->mips_hi16_list; | ||
1085 | while (l != NULL) { | ||
1086 | struct mips_hi16 *next; | ||
1087 | unsigned long insn; | ||
1088 | |||
1089 | /* Do the HI16 relocation. Note that we actually don't | ||
1090 | need to know anything about the LO16 itself, except where | ||
1091 | to find the low 16 bits of the addend needed by the LO16. */ | ||
1092 | insn = *l->addr; | ||
1093 | val = | ||
1094 | ((insn & 0xffff) << 16) + | ||
1095 | vallo; | ||
1096 | val += v; | ||
1097 | |||
1098 | /* Account for the sign extension that will happen in the | ||
1099 | low bits. */ | ||
1100 | val = | ||
1101 | ((val >> 16) + | ||
1102 | ((val & 0x8000) != | ||
1103 | 0)) & 0xffff; | ||
1104 | |||
1105 | insn = (insn & ~0xffff) | val; | ||
1106 | *l->addr = insn; | ||
1107 | |||
1108 | next = l->next; | ||
1109 | free(l); | ||
1110 | l = next; | ||
1111 | } | ||
1112 | |||
1113 | ifile->mips_hi16_list = NULL; | ||
1114 | } | ||
1115 | |||
1116 | /* Ok, we're done with the HI16 relocs. Now deal with the LO16. */ | ||
1117 | val = v + vallo; | ||
1118 | insnlo = (insnlo & ~0xffff) | (val & 0xffff); | ||
1119 | *loc = insnlo; | ||
1120 | break; | ||
1121 | } | ||
1122 | |||
1123 | #elif defined(__nios2__) | ||
1124 | |||
1125 | case R_NIOS2_NONE: | ||
1126 | break; | ||
1127 | |||
1128 | case R_NIOS2_BFD_RELOC_32: | ||
1129 | *loc += v; | ||
1130 | break; | ||
1131 | |||
1132 | case R_NIOS2_BFD_RELOC_16: | ||
1133 | if (v > 0xffff) { | ||
1134 | ret = obj_reloc_overflow; | ||
1135 | } | ||
1136 | *(short *)loc = v; | ||
1137 | break; | ||
1138 | |||
1139 | case R_NIOS2_BFD_RELOC_8: | ||
1140 | if (v > 0xff) { | ||
1141 | ret = obj_reloc_overflow; | ||
1142 | } | ||
1143 | *(char *)loc = v; | ||
1144 | break; | ||
1145 | |||
1146 | case R_NIOS2_S16: | ||
1147 | { | ||
1148 | Elf32_Addr word; | ||
1149 | |||
1150 | niro | 984 | if ((Elf32_Sword)v > 0x7fff |
1151 | || (Elf32_Sword)v < -(Elf32_Sword)0x8000 | ||
1152 | ) { | ||
1153 | niro | 816 | ret = obj_reloc_overflow; |
1154 | } | ||
1155 | |||
1156 | word = *loc; | ||
1157 | *loc = ((((word >> 22) << 16) | (v & 0xffff)) << 6) | | ||
1158 | (word & 0x3f); | ||
1159 | } | ||
1160 | break; | ||
1161 | |||
1162 | case R_NIOS2_U16: | ||
1163 | { | ||
1164 | Elf32_Addr word; | ||
1165 | |||
1166 | if (v > 0xffff) { | ||
1167 | ret = obj_reloc_overflow; | ||
1168 | } | ||
1169 | |||
1170 | word = *loc; | ||
1171 | *loc = ((((word >> 22) << 16) | (v & 0xffff)) << 6) | | ||
1172 | (word & 0x3f); | ||
1173 | } | ||
1174 | break; | ||
1175 | |||
1176 | case R_NIOS2_PCREL16: | ||
1177 | { | ||
1178 | Elf32_Addr word; | ||
1179 | |||
1180 | v -= dot + 4; | ||
1181 | niro | 984 | if ((Elf32_Sword)v > 0x7fff |
1182 | || (Elf32_Sword)v < -(Elf32_Sword)0x8000 | ||
1183 | ) { | ||
1184 | niro | 816 | ret = obj_reloc_overflow; |
1185 | } | ||
1186 | |||
1187 | word = *loc; | ||
1188 | *loc = ((((word >> 22) << 16) | (v & 0xffff)) << 6) | (word & 0x3f); | ||
1189 | } | ||
1190 | break; | ||
1191 | |||
1192 | case R_NIOS2_GPREL: | ||
1193 | { | ||
1194 | Elf32_Addr word, gp; | ||
1195 | /* get _gp */ | ||
1196 | gp = obj_symbol_final_value(f, obj_find_symbol(f, SPFX "_gp")); | ||
1197 | niro | 984 | v -= gp; |
1198 | if ((Elf32_Sword)v > 0x7fff | ||
1199 | || (Elf32_Sword)v < -(Elf32_Sword)0x8000 | ||
1200 | ) { | ||
1201 | niro | 816 | ret = obj_reloc_overflow; |
1202 | } | ||
1203 | |||
1204 | word = *loc; | ||
1205 | *loc = ((((word >> 22) << 16) | (v & 0xffff)) << 6) | (word & 0x3f); | ||
1206 | } | ||
1207 | break; | ||
1208 | |||
1209 | case R_NIOS2_CALL26: | ||
1210 | if (v & 3) | ||
1211 | ret = obj_reloc_dangerous; | ||
1212 | if ((v >> 28) != (dot >> 28)) | ||
1213 | ret = obj_reloc_overflow; | ||
1214 | *loc = (*loc & 0x3f) | ((v >> 2) << 6); | ||
1215 | break; | ||
1216 | |||
1217 | case R_NIOS2_IMM5: | ||
1218 | { | ||
1219 | Elf32_Addr word; | ||
1220 | |||
1221 | if (v > 0x1f) { | ||
1222 | ret = obj_reloc_overflow; | ||
1223 | } | ||
1224 | |||
1225 | word = *loc & ~0x7c0; | ||
1226 | *loc = word | ((v & 0x1f) << 6); | ||
1227 | } | ||
1228 | break; | ||
1229 | |||
1230 | case R_NIOS2_IMM6: | ||
1231 | { | ||
1232 | Elf32_Addr word; | ||
1233 | |||
1234 | if (v > 0x3f) { | ||
1235 | ret = obj_reloc_overflow; | ||
1236 | } | ||
1237 | |||
1238 | word = *loc & ~0xfc0; | ||
1239 | *loc = word | ((v & 0x3f) << 6); | ||
1240 | } | ||
1241 | break; | ||
1242 | |||
1243 | case R_NIOS2_IMM8: | ||
1244 | { | ||
1245 | Elf32_Addr word; | ||
1246 | |||
1247 | if (v > 0xff) { | ||
1248 | ret = obj_reloc_overflow; | ||
1249 | } | ||
1250 | |||
1251 | word = *loc & ~0x3fc0; | ||
1252 | *loc = word | ((v & 0xff) << 6); | ||
1253 | } | ||
1254 | break; | ||
1255 | |||
1256 | case R_NIOS2_HI16: | ||
1257 | { | ||
1258 | Elf32_Addr word; | ||
1259 | |||
1260 | word = *loc; | ||
1261 | *loc = ((((word >> 22) << 16) | ((v >>16) & 0xffff)) << 6) | | ||
1262 | (word & 0x3f); | ||
1263 | } | ||
1264 | break; | ||
1265 | |||
1266 | case R_NIOS2_LO16: | ||
1267 | { | ||
1268 | Elf32_Addr word; | ||
1269 | |||
1270 | word = *loc; | ||
1271 | *loc = ((((word >> 22) << 16) | (v & 0xffff)) << 6) | | ||
1272 | (word & 0x3f); | ||
1273 | } | ||
1274 | break; | ||
1275 | |||
1276 | case R_NIOS2_HIADJ16: | ||
1277 | { | ||
1278 | Elf32_Addr word1, word2; | ||
1279 | |||
1280 | word1 = *loc; | ||
1281 | word2 = ((v >> 16) + ((v >> 15) & 1)) & 0xffff; | ||
1282 | *loc = ((((word1 >> 22) << 16) | word2) << 6) | | ||
1283 | (word1 & 0x3f); | ||
1284 | } | ||
1285 | break; | ||
1286 | |||
1287 | #elif defined(__powerpc64__) | ||
1288 | /* PPC64 needs a 2.6 kernel, 2.4 module relocation irrelevant */ | ||
1289 | |||
1290 | #elif defined(__powerpc__) | ||
1291 | |||
1292 | case R_PPC_ADDR16_HA: | ||
1293 | *(unsigned short *)loc = (v + 0x8000) >> 16; | ||
1294 | break; | ||
1295 | |||
1296 | case R_PPC_ADDR16_HI: | ||
1297 | *(unsigned short *)loc = v >> 16; | ||
1298 | break; | ||
1299 | |||
1300 | case R_PPC_ADDR16_LO: | ||
1301 | *(unsigned short *)loc = v; | ||
1302 | break; | ||
1303 | |||
1304 | case R_PPC_REL24: | ||
1305 | goto bb_use_plt; | ||
1306 | |||
1307 | case R_PPC_REL32: | ||
1308 | *loc = v - dot; | ||
1309 | break; | ||
1310 | |||
1311 | case R_PPC_ADDR32: | ||
1312 | *loc = v; | ||
1313 | break; | ||
1314 | |||
1315 | #elif defined(__s390__) | ||
1316 | |||
1317 | case R_390_32: | ||
1318 | *(unsigned int *) loc += v; | ||
1319 | break; | ||
1320 | case R_390_16: | ||
1321 | *(unsigned short *) loc += v; | ||
1322 | break; | ||
1323 | case R_390_8: | ||
1324 | *(unsigned char *) loc += v; | ||
1325 | break; | ||
1326 | |||
1327 | case R_390_PC32: | ||
1328 | *(unsigned int *) loc += v - dot; | ||
1329 | break; | ||
1330 | case R_390_PC16DBL: | ||
1331 | *(unsigned short *) loc += (v - dot) >> 1; | ||
1332 | break; | ||
1333 | case R_390_PC16: | ||
1334 | *(unsigned short *) loc += v - dot; | ||
1335 | break; | ||
1336 | |||
1337 | case R_390_PLT32: | ||
1338 | case R_390_PLT16DBL: | ||
1339 | /* find the plt entry and initialize it. */ | ||
1340 | pe = (struct arch_single_entry *) &isym->pltent; | ||
1341 | if (pe->inited == 0) { | ||
1342 | ip = (unsigned long *)(ifile->plt->contents + pe->offset); | ||
1343 | ip[0] = 0x0d105810; /* basr 1,0; lg 1,10(1); br 1 */ | ||
1344 | ip[1] = 0x100607f1; | ||
1345 | if (ELF_R_TYPE(rel->r_info) == R_390_PLT16DBL) | ||
1346 | ip[2] = v - 2; | ||
1347 | else | ||
1348 | ip[2] = v; | ||
1349 | pe->inited = 1; | ||
1350 | } | ||
1351 | |||
1352 | /* Insert relative distance to target. */ | ||
1353 | v = plt + pe->offset - dot; | ||
1354 | if (ELF_R_TYPE(rel->r_info) == R_390_PLT32) | ||
1355 | *(unsigned int *) loc = (unsigned int) v; | ||
1356 | else if (ELF_R_TYPE(rel->r_info) == R_390_PLT16DBL) | ||
1357 | *(unsigned short *) loc = (unsigned short) ((v + 2) >> 1); | ||
1358 | break; | ||
1359 | |||
1360 | case R_390_GLOB_DAT: | ||
1361 | case R_390_JMP_SLOT: | ||
1362 | *loc = v; | ||
1363 | break; | ||
1364 | |||
1365 | case R_390_RELATIVE: | ||
1366 | *loc += f->baseaddr; | ||
1367 | break; | ||
1368 | |||
1369 | case R_390_GOTPC: | ||
1370 | *(unsigned long *) loc += got - dot; | ||
1371 | break; | ||
1372 | |||
1373 | case R_390_GOT12: | ||
1374 | case R_390_GOT16: | ||
1375 | case R_390_GOT32: | ||
1376 | if (!isym->gotent.inited) | ||
1377 | { | ||
1378 | isym->gotent.inited = 1; | ||
1379 | *(ElfW(Addr) *)(ifile->got->contents + isym->gotent.offset) = v; | ||
1380 | } | ||
1381 | if (ELF_R_TYPE(rel->r_info) == R_390_GOT12) | ||
1382 | *(unsigned short *) loc |= (*(unsigned short *) loc + isym->gotent.offset) & 0xfff; | ||
1383 | else if (ELF_R_TYPE(rel->r_info) == R_390_GOT16) | ||
1384 | *(unsigned short *) loc += isym->gotent.offset; | ||
1385 | else if (ELF_R_TYPE(rel->r_info) == R_390_GOT32) | ||
1386 | *(unsigned int *) loc += isym->gotent.offset; | ||
1387 | break; | ||
1388 | |||
1389 | # ifndef R_390_GOTOFF32 | ||
1390 | # define R_390_GOTOFF32 R_390_GOTOFF | ||
1391 | # endif | ||
1392 | case R_390_GOTOFF32: | ||
1393 | *loc += v - got; | ||
1394 | break; | ||
1395 | |||
1396 | #elif defined(__sh__) | ||
1397 | |||
1398 | case R_SH_NONE: | ||
1399 | break; | ||
1400 | |||
1401 | case R_SH_DIR32: | ||
1402 | *loc += v; | ||
1403 | break; | ||
1404 | |||
1405 | case R_SH_REL32: | ||
1406 | *loc += v - dot; | ||
1407 | break; | ||
1408 | |||
1409 | case R_SH_PLT32: | ||
1410 | *loc = v - dot; | ||
1411 | break; | ||
1412 | |||
1413 | case R_SH_GLOB_DAT: | ||
1414 | case R_SH_JMP_SLOT: | ||
1415 | *loc = v; | ||
1416 | break; | ||
1417 | |||
1418 | case R_SH_RELATIVE: | ||
1419 | *loc = f->baseaddr + rel->r_addend; | ||
1420 | break; | ||
1421 | |||
1422 | case R_SH_GOTPC: | ||
1423 | *loc = got - dot + rel->r_addend; | ||
1424 | break; | ||
1425 | |||
1426 | case R_SH_GOT32: | ||
1427 | goto bb_use_got; | ||
1428 | |||
1429 | case R_SH_GOTOFF: | ||
1430 | *loc = v - got; | ||
1431 | break; | ||
1432 | |||
1433 | # if defined(__SH5__) | ||
1434 | case R_SH_IMM_MEDLOW16: | ||
1435 | case R_SH_IMM_LOW16: | ||
1436 | { | ||
1437 | ElfW(Addr) word; | ||
1438 | |||
1439 | if (ELF_R_TYPE(rel->r_info) == R_SH_IMM_MEDLOW16) | ||
1440 | v >>= 16; | ||
1441 | |||
1442 | /* | ||
1443 | * movi and shori have the format: | ||
1444 | * | ||
1445 | * | op | imm | reg | reserved | | ||
1446 | * 31..26 25..10 9.. 4 3 .. 0 | ||
1447 | * | ||
1448 | * so we simply mask and or in imm. | ||
1449 | */ | ||
1450 | word = *loc & ~0x3fffc00; | ||
1451 | word |= (v & 0xffff) << 10; | ||
1452 | |||
1453 | *loc = word; | ||
1454 | |||
1455 | break; | ||
1456 | } | ||
1457 | |||
1458 | case R_SH_IMM_MEDLOW16_PCREL: | ||
1459 | case R_SH_IMM_LOW16_PCREL: | ||
1460 | { | ||
1461 | ElfW(Addr) word; | ||
1462 | |||
1463 | word = *loc & ~0x3fffc00; | ||
1464 | |||
1465 | v -= dot; | ||
1466 | |||
1467 | if (ELF_R_TYPE(rel->r_info) == R_SH_IMM_MEDLOW16_PCREL) | ||
1468 | v >>= 16; | ||
1469 | |||
1470 | word |= (v & 0xffff) << 10; | ||
1471 | |||
1472 | *loc = word; | ||
1473 | |||
1474 | break; | ||
1475 | } | ||
1476 | # endif /* __SH5__ */ | ||
1477 | |||
1478 | #elif defined(__v850e__) | ||
1479 | |||
1480 | case R_V850_NONE: | ||
1481 | break; | ||
1482 | |||
1483 | case R_V850_32: | ||
1484 | /* We write two shorts instead of a long because even | ||
1485 | 32-bit insns only need half-word alignment, but | ||
1486 | 32-bit data needs to be long-word aligned. */ | ||
1487 | v += ((unsigned short *)loc)[0]; | ||
1488 | v += ((unsigned short *)loc)[1] << 16; | ||
1489 | ((unsigned short *)loc)[0] = v & 0xffff; | ||
1490 | ((unsigned short *)loc)[1] = (v >> 16) & 0xffff; | ||
1491 | break; | ||
1492 | |||
1493 | case R_V850_22_PCREL: | ||
1494 | goto bb_use_plt; | ||
1495 | |||
1496 | #elif defined(__x86_64__) | ||
1497 | |||
1498 | case R_X86_64_NONE: | ||
1499 | break; | ||
1500 | |||
1501 | case R_X86_64_64: | ||
1502 | *loc += v; | ||
1503 | break; | ||
1504 | |||
1505 | case R_X86_64_32: | ||
1506 | *(unsigned int *) loc += v; | ||
1507 | if (v > 0xffffffff) | ||
1508 | { | ||
1509 | ret = obj_reloc_overflow; /* Kernel module compiled without -mcmodel=kernel. */ | ||
1510 | /* error("Possibly is module compiled without -mcmodel=kernel!"); */ | ||
1511 | } | ||
1512 | break; | ||
1513 | |||
1514 | case R_X86_64_32S: | ||
1515 | *(signed int *) loc += v; | ||
1516 | break; | ||
1517 | |||
1518 | case R_X86_64_16: | ||
1519 | *(unsigned short *) loc += v; | ||
1520 | break; | ||
1521 | |||
1522 | case R_X86_64_8: | ||
1523 | *(unsigned char *) loc += v; | ||
1524 | break; | ||
1525 | |||
1526 | case R_X86_64_PC32: | ||
1527 | *(unsigned int *) loc += v - dot; | ||
1528 | break; | ||
1529 | |||
1530 | case R_X86_64_PC16: | ||
1531 | *(unsigned short *) loc += v - dot; | ||
1532 | break; | ||
1533 | |||
1534 | case R_X86_64_PC8: | ||
1535 | *(unsigned char *) loc += v - dot; | ||
1536 | break; | ||
1537 | |||
1538 | case R_X86_64_GLOB_DAT: | ||
1539 | case R_X86_64_JUMP_SLOT: | ||
1540 | *loc = v; | ||
1541 | break; | ||
1542 | |||
1543 | case R_X86_64_RELATIVE: | ||
1544 | *loc += f->baseaddr; | ||
1545 | break; | ||
1546 | |||
1547 | case R_X86_64_GOT32: | ||
1548 | case R_X86_64_GOTPCREL: | ||
1549 | goto bb_use_got; | ||
1550 | # if 0 | ||
1551 | if (!isym->gotent.reloc_done) | ||
1552 | { | ||
1553 | isym->gotent.reloc_done = 1; | ||
1554 | *(Elf64_Addr *)(ifile->got->contents + isym->gotent.offset) = v; | ||
1555 | } | ||
1556 | /* XXX are these really correct? */ | ||
1557 | if (ELF64_R_TYPE(rel->r_info) == R_X86_64_GOTPCREL) | ||
1558 | *(unsigned int *) loc += v + isym->gotent.offset; | ||
1559 | else | ||
1560 | *loc += isym->gotent.offset; | ||
1561 | break; | ||
1562 | # endif | ||
1563 | |||
1564 | #else | ||
1565 | # warning "no idea how to handle relocations on your arch" | ||
1566 | #endif | ||
1567 | |||
1568 | default: | ||
1569 | printf("Warning: unhandled reloc %d\n",(int)ELF_R_TYPE(rel->r_info)); | ||
1570 | ret = obj_reloc_unhandled; | ||
1571 | break; | ||
1572 | |||
1573 | #if defined(USE_PLT_ENTRIES) | ||
1574 | |||
1575 | bb_use_plt: | ||
1576 | |||
1577 | /* find the plt entry and initialize it if necessary */ | ||
1578 | |||
1579 | #if defined(USE_PLT_LIST) | ||
1580 | for (pe = isym->pltent; pe != NULL && pe->addend != rel->r_addend;) | ||
1581 | pe = pe->next; | ||
1582 | #else | ||
1583 | pe = &isym->pltent; | ||
1584 | #endif | ||
1585 | |||
1586 | if (! pe->inited) { | ||
1587 | ip = (unsigned long *) (ifile->plt->contents + pe->offset); | ||
1588 | |||
1589 | /* generate some machine code */ | ||
1590 | |||
1591 | #if defined(__arm__) | ||
1592 | ip[0] = 0xe51ff004; /* ldr pc,[pc,#-4] */ | ||
1593 | ip[1] = v; /* sym@ */ | ||
1594 | #endif | ||
1595 | #if defined(__powerpc__) | ||
1596 | ip[0] = 0x3d600000 + ((v + 0x8000) >> 16); /* lis r11,sym@ha */ | ||
1597 | ip[1] = 0x396b0000 + (v & 0xffff); /* addi r11,r11,sym@l */ | ||
1598 | ip[2] = 0x7d6903a6; /* mtctr r11 */ | ||
1599 | ip[3] = 0x4e800420; /* bctr */ | ||
1600 | #endif | ||
1601 | #if defined(__v850e__) | ||
1602 | /* We have to trash a register, so we assume that any control | ||
1603 | transfer more than 21-bits away must be a function call | ||
1604 | (so we can use a call-clobbered register). */ | ||
1605 | ip[0] = 0x0621 + ((v & 0xffff) << 16); /* mov sym, r1 ... */ | ||
1606 | ip[1] = ((v >> 16) & 0xffff) + 0x610000; /* ...; jmp r1 */ | ||
1607 | #endif | ||
1608 | pe->inited = 1; | ||
1609 | } | ||
1610 | |||
1611 | /* relative distance to target */ | ||
1612 | v -= dot; | ||
1613 | /* if the target is too far away.... */ | ||
1614 | #if defined(__arm__) || defined(__powerpc__) | ||
1615 | if ((int)v < -0x02000000 || (int)v >= 0x02000000) | ||
1616 | #elif defined(__v850e__) | ||
1617 | if ((ElfW(Sword))v > 0x1fffff || (ElfW(Sword))v < (ElfW(Sword))-0x200000) | ||
1618 | #endif | ||
1619 | /* go via the plt */ | ||
1620 | v = plt + pe->offset - dot; | ||
1621 | |||
1622 | #if defined(__v850e__) | ||
1623 | if (v & 1) | ||
1624 | #else | ||
1625 | if (v & 3) | ||
1626 | #endif | ||
1627 | ret = obj_reloc_dangerous; | ||
1628 | |||
1629 | /* merge the offset into the instruction. */ | ||
1630 | #if defined(__arm__) | ||
1631 | /* Convert to words. */ | ||
1632 | v >>= 2; | ||
1633 | |||
1634 | *loc = (*loc & ~0x00ffffff) | ((v + *loc) & 0x00ffffff); | ||
1635 | #endif | ||
1636 | #if defined(__powerpc__) | ||
1637 | *loc = (*loc & ~0x03fffffc) | (v & 0x03fffffc); | ||
1638 | #endif | ||
1639 | #if defined(__v850e__) | ||
1640 | /* We write two shorts instead of a long because even 32-bit insns | ||
1641 | only need half-word alignment, but the 32-bit data write needs | ||
1642 | to be long-word aligned. */ | ||
1643 | ((unsigned short *)loc)[0] = | ||
1644 | (*(unsigned short *)loc & 0xffc0) /* opcode + reg */ | ||
1645 | | ((v >> 16) & 0x3f); /* offs high part */ | ||
1646 | ((unsigned short *)loc)[1] = | ||
1647 | (v & 0xffff); /* offs low part */ | ||
1648 | #endif | ||
1649 | break; | ||
1650 | #endif /* USE_PLT_ENTRIES */ | ||
1651 | |||
1652 | #if defined(USE_GOT_ENTRIES) | ||
1653 | bb_use_got: | ||
1654 | |||
1655 | /* needs an entry in the .got: set it, once */ | ||
1656 | if (!isym->gotent.inited) { | ||
1657 | isym->gotent.inited = 1; | ||
1658 | *(ElfW(Addr) *) (ifile->got->contents + isym->gotent.offset) = v; | ||
1659 | } | ||
1660 | /* make the reloc with_respect_to_.got */ | ||
1661 | #if defined(__sh__) | ||
1662 | *loc += isym->gotent.offset + rel->r_addend; | ||
1663 | #elif defined(__i386__) || defined(__arm__) || defined(__mc68000__) | ||
1664 | *loc += isym->gotent.offset; | ||
1665 | #endif | ||
1666 | break; | ||
1667 | |||
1668 | #endif /* USE_GOT_ENTRIES */ | ||
1669 | } | ||
1670 | |||
1671 | return ret; | ||
1672 | } | ||
1673 | |||
1674 | |||
1675 | #if defined(USE_LIST) | ||
1676 | |||
1677 | static int arch_list_add(ElfW(RelM) *rel, struct arch_list_entry **list, | ||
1678 | int offset, int size) | ||
1679 | { | ||
1680 | struct arch_list_entry *pe; | ||
1681 | |||
1682 | for (pe = *list; pe != NULL; pe = pe->next) { | ||
1683 | if (pe->addend == rel->r_addend) { | ||
1684 | break; | ||
1685 | } | ||
1686 | } | ||
1687 | |||
1688 | if (pe == NULL) { | ||
1689 | niro | 984 | pe = xzalloc(sizeof(struct arch_list_entry)); |
1690 | niro | 816 | pe->next = *list; |
1691 | pe->addend = rel->r_addend; | ||
1692 | pe->offset = offset; | ||
1693 | niro | 984 | /*pe->inited = 0;*/ |
1694 | niro | 816 | *list = pe; |
1695 | return size; | ||
1696 | } | ||
1697 | return 0; | ||
1698 | } | ||
1699 | |||
1700 | #endif | ||
1701 | |||
1702 | #if defined(USE_SINGLE) | ||
1703 | |||
1704 | static int arch_single_init(/*ElfW(RelM) *rel,*/ struct arch_single_entry *single, | ||
1705 | niro | 984 | int offset, int size) |
1706 | niro | 816 | { |
1707 | if (single->allocated == 0) { | ||
1708 | single->allocated = 1; | ||
1709 | single->offset = offset; | ||
1710 | single->inited = 0; | ||
1711 | return size; | ||
1712 | } | ||
1713 | return 0; | ||
1714 | } | ||
1715 | |||
1716 | #endif | ||
1717 | |||
1718 | #if defined(USE_GOT_ENTRIES) || defined(USE_PLT_ENTRIES) | ||
1719 | |||
1720 | static struct obj_section *arch_xsect_init(struct obj_file *f, const char *name, | ||
1721 | niro | 984 | int offset, int size) |
1722 | niro | 816 | { |
1723 | struct obj_section *myrelsec = obj_find_section(f, name); | ||
1724 | |||
1725 | if (offset == 0) { | ||
1726 | offset += size; | ||
1727 | } | ||
1728 | |||
1729 | if (myrelsec) { | ||
1730 | obj_extend_section(myrelsec, offset); | ||
1731 | } else { | ||
1732 | myrelsec = obj_create_alloced_section(f, name, | ||
1733 | size, offset); | ||
1734 | } | ||
1735 | |||
1736 | return myrelsec; | ||
1737 | } | ||
1738 | |||
1739 | #endif | ||
1740 | |||
1741 | static void arch_create_got(struct obj_file *f) | ||
1742 | { | ||
1743 | #if defined(USE_GOT_ENTRIES) || defined(USE_PLT_ENTRIES) | ||
1744 | struct arch_file *ifile = (struct arch_file *) f; | ||
1745 | int i; | ||
1746 | #if defined(USE_GOT_ENTRIES) | ||
1747 | int got_offset = 0, got_needed = 0, got_allocate; | ||
1748 | #endif | ||
1749 | #if defined(USE_PLT_ENTRIES) | ||
1750 | int plt_offset = 0, plt_needed = 0, plt_allocate; | ||
1751 | #endif | ||
1752 | struct obj_section *relsec, *symsec, *strsec; | ||
1753 | ElfW(RelM) *rel, *relend; | ||
1754 | ElfW(Sym) *symtab, *extsym; | ||
1755 | const char *strtab, *name; | ||
1756 | struct arch_symbol *intsym; | ||
1757 | |||
1758 | for (i = 0; i < f->header.e_shnum; ++i) { | ||
1759 | relsec = f->sections[i]; | ||
1760 | if (relsec->header.sh_type != SHT_RELM) | ||
1761 | continue; | ||
1762 | |||
1763 | symsec = f->sections[relsec->header.sh_link]; | ||
1764 | strsec = f->sections[symsec->header.sh_link]; | ||
1765 | |||
1766 | rel = (ElfW(RelM) *) relsec->contents; | ||
1767 | relend = rel + (relsec->header.sh_size / sizeof(ElfW(RelM))); | ||
1768 | symtab = (ElfW(Sym) *) symsec->contents; | ||
1769 | strtab = (const char *) strsec->contents; | ||
1770 | |||
1771 | for (; rel < relend; ++rel) { | ||
1772 | extsym = &symtab[ELF_R_SYM(rel->r_info)]; | ||
1773 | |||
1774 | #if defined(USE_GOT_ENTRIES) | ||
1775 | got_allocate = 0; | ||
1776 | #endif | ||
1777 | #if defined(USE_PLT_ENTRIES) | ||
1778 | plt_allocate = 0; | ||
1779 | #endif | ||
1780 | |||
1781 | switch (ELF_R_TYPE(rel->r_info)) { | ||
1782 | #if defined(__arm__) | ||
1783 | case R_ARM_PC24: | ||
1784 | case R_ARM_PLT32: | ||
1785 | plt_allocate = 1; | ||
1786 | break; | ||
1787 | |||
1788 | case R_ARM_GOTOFF: | ||
1789 | case R_ARM_GOTPC: | ||
1790 | got_needed = 1; | ||
1791 | continue; | ||
1792 | |||
1793 | case R_ARM_GOT32: | ||
1794 | got_allocate = 1; | ||
1795 | break; | ||
1796 | |||
1797 | #elif defined(__i386__) | ||
1798 | case R_386_GOTPC: | ||
1799 | case R_386_GOTOFF: | ||
1800 | got_needed = 1; | ||
1801 | continue; | ||
1802 | |||
1803 | case R_386_GOT32: | ||
1804 | got_allocate = 1; | ||
1805 | break; | ||
1806 | |||
1807 | #elif defined(__powerpc__) | ||
1808 | case R_PPC_REL24: | ||
1809 | plt_allocate = 1; | ||
1810 | break; | ||
1811 | |||
1812 | #elif defined(__mc68000__) | ||
1813 | case R_68K_GOT32: | ||
1814 | got_allocate = 1; | ||
1815 | break; | ||
1816 | |||
1817 | #ifdef R_68K_GOTOFF | ||
1818 | case R_68K_GOTOFF: | ||
1819 | got_needed = 1; | ||
1820 | continue; | ||
1821 | #endif | ||
1822 | |||
1823 | #elif defined(__sh__) | ||
1824 | case R_SH_GOT32: | ||
1825 | got_allocate = 1; | ||
1826 | break; | ||
1827 | |||
1828 | case R_SH_GOTPC: | ||
1829 | case R_SH_GOTOFF: | ||
1830 | got_needed = 1; | ||
1831 | continue; | ||
1832 | |||
1833 | #elif defined(__v850e__) | ||
1834 | case R_V850_22_PCREL: | ||
1835 | plt_needed = 1; | ||
1836 | break; | ||
1837 | |||
1838 | #endif | ||
1839 | default: | ||
1840 | continue; | ||
1841 | } | ||
1842 | |||
1843 | if (extsym->st_name != 0) { | ||
1844 | name = strtab + extsym->st_name; | ||
1845 | } else { | ||
1846 | name = f->sections[extsym->st_shndx]->name; | ||
1847 | } | ||
1848 | intsym = (struct arch_symbol *) obj_find_symbol(f, name); | ||
1849 | #if defined(USE_GOT_ENTRIES) | ||
1850 | if (got_allocate) { | ||
1851 | got_offset += arch_single_init( | ||
1852 | /*rel,*/ &intsym->gotent, | ||
1853 | got_offset, GOT_ENTRY_SIZE); | ||
1854 | |||
1855 | got_needed = 1; | ||
1856 | } | ||
1857 | #endif | ||
1858 | #if defined(USE_PLT_ENTRIES) | ||
1859 | if (plt_allocate) { | ||
1860 | #if defined(USE_PLT_LIST) | ||
1861 | plt_offset += arch_list_add( | ||
1862 | rel, &intsym->pltent, | ||
1863 | plt_offset, PLT_ENTRY_SIZE); | ||
1864 | #else | ||
1865 | plt_offset += arch_single_init( | ||
1866 | /*rel,*/ &intsym->pltent, | ||
1867 | plt_offset, PLT_ENTRY_SIZE); | ||
1868 | #endif | ||
1869 | plt_needed = 1; | ||
1870 | } | ||
1871 | #endif | ||
1872 | } | ||
1873 | } | ||
1874 | |||
1875 | #if defined(USE_GOT_ENTRIES) | ||
1876 | if (got_needed) { | ||
1877 | ifile->got = arch_xsect_init(f, ".got", got_offset, | ||
1878 | GOT_ENTRY_SIZE); | ||
1879 | } | ||
1880 | #endif | ||
1881 | |||
1882 | #if defined(USE_PLT_ENTRIES) | ||
1883 | if (plt_needed) { | ||
1884 | ifile->plt = arch_xsect_init(f, ".plt", plt_offset, | ||
1885 | PLT_ENTRY_SIZE); | ||
1886 | } | ||
1887 | #endif | ||
1888 | |||
1889 | #endif /* defined(USE_GOT_ENTRIES) || defined(USE_PLT_ENTRIES) */ | ||
1890 | } | ||
1891 | |||
1892 | /*======================================================================*/ | ||
1893 | |||
1894 | /* Standard ELF hash function. */ | ||
1895 | static unsigned long obj_elf_hash_n(const char *name, unsigned long n) | ||
1896 | { | ||
1897 | unsigned long h = 0; | ||
1898 | unsigned long g; | ||
1899 | unsigned char ch; | ||
1900 | |||
1901 | while (n > 0) { | ||
1902 | ch = *name++; | ||
1903 | h = (h << 4) + ch; | ||
1904 | g = (h & 0xf0000000); | ||
1905 | if (g != 0) { | ||
1906 | h ^= g >> 24; | ||
1907 | h &= ~g; | ||
1908 | } | ||
1909 | n--; | ||
1910 | } | ||
1911 | return h; | ||
1912 | } | ||
1913 | |||
1914 | niro | 984 | static unsigned long FAST_FUNC obj_elf_hash(const char *name) |
1915 | niro | 816 | { |
1916 | return obj_elf_hash_n(name, strlen(name)); | ||
1917 | } | ||
1918 | |||
1919 | #if ENABLE_FEATURE_INSMOD_VERSION_CHECKING | ||
1920 | /* String comparison for non-co-versioned kernel and module. */ | ||
1921 | |||
1922 | static int ncv_strcmp(const char *a, const char *b) | ||
1923 | { | ||
1924 | size_t alen = strlen(a), blen = strlen(b); | ||
1925 | |||
1926 | if (blen == alen + 10 && b[alen] == '_' && b[alen + 1] == 'R') | ||
1927 | return strncmp(a, b, alen); | ||
1928 | else if (alen == blen + 10 && a[blen] == '_' && a[blen + 1] == 'R') | ||
1929 | return strncmp(a, b, blen); | ||
1930 | else | ||
1931 | return strcmp(a, b); | ||
1932 | } | ||
1933 | |||
1934 | /* String hashing for non-co-versioned kernel and module. Here | ||
1935 | we are simply forced to drop the crc from the hash. */ | ||
1936 | |||
1937 | niro | 984 | static unsigned long FAST_FUNC ncv_symbol_hash(const char *str) |
1938 | niro | 816 | { |
1939 | size_t len = strlen(str); | ||
1940 | if (len > 10 && str[len - 10] == '_' && str[len - 9] == 'R') | ||
1941 | len -= 10; | ||
1942 | return obj_elf_hash_n(str, len); | ||
1943 | } | ||
1944 | |||
1945 | static void | ||
1946 | obj_set_symbol_compare(struct obj_file *f, | ||
1947 | niro | 984 | int (*cmp) (const char *, const char *), |
1948 | unsigned long (*hash) (const char *) FAST_FUNC) | ||
1949 | niro | 816 | { |
1950 | if (cmp) | ||
1951 | f->symbol_cmp = cmp; | ||
1952 | if (hash) { | ||
1953 | struct obj_symbol *tmptab[HASH_BUCKETS], *sym, *next; | ||
1954 | int i; | ||
1955 | |||
1956 | f->symbol_hash = hash; | ||
1957 | |||
1958 | memcpy(tmptab, f->symtab, sizeof(tmptab)); | ||
1959 | memset(f->symtab, 0, sizeof(f->symtab)); | ||
1960 | |||
1961 | niro | 984 | for (i = 0; i < HASH_BUCKETS; ++i) { |
1962 | niro | 816 | for (sym = tmptab[i]; sym; sym = next) { |
1963 | unsigned long h = hash(sym->name) % HASH_BUCKETS; | ||
1964 | next = sym->next; | ||
1965 | sym->next = f->symtab[h]; | ||
1966 | f->symtab[h] = sym; | ||
1967 | } | ||
1968 | niro | 984 | } |
1969 | niro | 816 | } |
1970 | } | ||
1971 | |||
1972 | #endif /* FEATURE_INSMOD_VERSION_CHECKING */ | ||
1973 | |||
1974 | static struct obj_symbol * | ||
1975 | obj_add_symbol(struct obj_file *f, const char *name, | ||
1976 | niro | 984 | unsigned long symidx, int info, |
1977 | int secidx, ElfW(Addr) value, | ||
1978 | unsigned long size) | ||
1979 | niro | 816 | { |
1980 | struct obj_symbol *sym; | ||
1981 | unsigned long hash = f->symbol_hash(name) % HASH_BUCKETS; | ||
1982 | int n_type = ELF_ST_TYPE(info); | ||
1983 | int n_binding = ELF_ST_BIND(info); | ||
1984 | |||
1985 | for (sym = f->symtab[hash]; sym; sym = sym->next) { | ||
1986 | if (f->symbol_cmp(sym->name, name) == 0) { | ||
1987 | int o_secidx = sym->secidx; | ||
1988 | int o_info = sym->info; | ||
1989 | int o_type = ELF_ST_TYPE(o_info); | ||
1990 | int o_binding = ELF_ST_BIND(o_info); | ||
1991 | |||
1992 | /* A redefinition! Is it legal? */ | ||
1993 | |||
1994 | if (secidx == SHN_UNDEF) | ||
1995 | return sym; | ||
1996 | else if (o_secidx == SHN_UNDEF) | ||
1997 | goto found; | ||
1998 | else if (n_binding == STB_GLOBAL && o_binding == STB_LOCAL) { | ||
1999 | /* Cope with local and global symbols of the same name | ||
2000 | in the same object file, as might have been created | ||
2001 | by ld -r. The only reason locals are now seen at this | ||
2002 | level at all is so that we can do semi-sensible things | ||
2003 | with parameters. */ | ||
2004 | |||
2005 | struct obj_symbol *nsym, **p; | ||
2006 | |||
2007 | nsym = arch_new_symbol(); | ||
2008 | nsym->next = sym->next; | ||
2009 | nsym->ksymidx = -1; | ||
2010 | |||
2011 | /* Excise the old (local) symbol from the hash chain. */ | ||
2012 | for (p = &f->symtab[hash]; *p != sym; p = &(*p)->next) | ||
2013 | continue; | ||
2014 | *p = sym = nsym; | ||
2015 | goto found; | ||
2016 | } else if (n_binding == STB_LOCAL) { | ||
2017 | /* Another symbol of the same name has already been defined. | ||
2018 | Just add this to the local table. */ | ||
2019 | sym = arch_new_symbol(); | ||
2020 | sym->next = NULL; | ||
2021 | sym->ksymidx = -1; | ||
2022 | f->local_symtab[symidx] = sym; | ||
2023 | goto found; | ||
2024 | } else if (n_binding == STB_WEAK) | ||
2025 | return sym; | ||
2026 | else if (o_binding == STB_WEAK) | ||
2027 | goto found; | ||
2028 | /* Don't unify COMMON symbols with object types the programmer | ||
2029 | doesn't expect. */ | ||
2030 | else if (secidx == SHN_COMMON | ||
2031 | && (o_type == STT_NOTYPE || o_type == STT_OBJECT)) | ||
2032 | return sym; | ||
2033 | else if (o_secidx == SHN_COMMON | ||
2034 | && (n_type == STT_NOTYPE || n_type == STT_OBJECT)) | ||
2035 | goto found; | ||
2036 | else { | ||
2037 | /* Don't report an error if the symbol is coming from | ||
2038 | the kernel or some external module. */ | ||
2039 | if (secidx <= SHN_HIRESERVE) | ||
2040 | bb_error_msg("%s multiply defined", name); | ||
2041 | return sym; | ||
2042 | } | ||
2043 | } | ||
2044 | } | ||
2045 | |||
2046 | /* Completely new symbol. */ | ||
2047 | sym = arch_new_symbol(); | ||
2048 | sym->next = f->symtab[hash]; | ||
2049 | f->symtab[hash] = sym; | ||
2050 | sym->ksymidx = -1; | ||
2051 | if (ELF_ST_BIND(info) == STB_LOCAL && symidx != (unsigned long)(-1)) { | ||
2052 | if (symidx >= f->local_symtab_size) | ||
2053 | bb_error_msg("local symbol %s with index %ld exceeds local_symtab_size %ld", | ||
2054 | name, (long) symidx, (long) f->local_symtab_size); | ||
2055 | else | ||
2056 | f->local_symtab[symidx] = sym; | ||
2057 | } | ||
2058 | |||
2059 | found: | ||
2060 | sym->name = name; | ||
2061 | sym->value = value; | ||
2062 | sym->size = size; | ||
2063 | sym->secidx = secidx; | ||
2064 | sym->info = info; | ||
2065 | |||
2066 | return sym; | ||
2067 | } | ||
2068 | |||
2069 | static struct obj_symbol * | ||
2070 | obj_find_symbol(struct obj_file *f, const char *name) | ||
2071 | { | ||
2072 | struct obj_symbol *sym; | ||
2073 | unsigned long hash = f->symbol_hash(name) % HASH_BUCKETS; | ||
2074 | |||
2075 | for (sym = f->symtab[hash]; sym; sym = sym->next) | ||
2076 | if (f->symbol_cmp(sym->name, name) == 0) | ||
2077 | return sym; | ||
2078 | return NULL; | ||
2079 | } | ||
2080 | |||
2081 | static ElfW(Addr) obj_symbol_final_value(struct obj_file * f, struct obj_symbol * sym) | ||
2082 | { | ||
2083 | if (sym) { | ||
2084 | if (sym->secidx >= SHN_LORESERVE) | ||
2085 | return sym->value; | ||
2086 | return sym->value + f->sections[sym->secidx]->header.sh_addr; | ||
2087 | } | ||
2088 | niro | 984 | /* As a special case, a NULL sym has value zero. */ |
2089 | return 0; | ||
2090 | niro | 816 | } |
2091 | |||
2092 | static struct obj_section *obj_find_section(struct obj_file *f, const char *name) | ||
2093 | { | ||
2094 | int i, n = f->header.e_shnum; | ||
2095 | |||
2096 | for (i = 0; i < n; ++i) | ||
2097 | if (strcmp(f->sections[i]->name, name) == 0) | ||
2098 | return f->sections[i]; | ||
2099 | return NULL; | ||
2100 | } | ||
2101 | |||
2102 | static int obj_load_order_prio(struct obj_section *a) | ||
2103 | { | ||
2104 | unsigned long af, ac; | ||
2105 | |||
2106 | af = a->header.sh_flags; | ||
2107 | |||
2108 | ac = 0; | ||
2109 | niro | 984 | if (a->name[0] != '.' || strlen(a->name) != 10 |
2110 | || strcmp(a->name + 5, ".init") != 0 | ||
2111 | ) { | ||
2112 | niro | 816 | ac |= 32; |
2113 | niro | 984 | } |
2114 | niro | 816 | if (af & SHF_ALLOC) |
2115 | ac |= 16; | ||
2116 | if (!(af & SHF_WRITE)) | ||
2117 | ac |= 8; | ||
2118 | if (af & SHF_EXECINSTR) | ||
2119 | ac |= 4; | ||
2120 | if (a->header.sh_type != SHT_NOBITS) | ||
2121 | ac |= 2; | ||
2122 | |||
2123 | return ac; | ||
2124 | } | ||
2125 | |||
2126 | static void | ||
2127 | obj_insert_section_load_order(struct obj_file *f, struct obj_section *sec) | ||
2128 | { | ||
2129 | struct obj_section **p; | ||
2130 | int prio = obj_load_order_prio(sec); | ||
2131 | for (p = f->load_order_search_start; *p; p = &(*p)->load_next) | ||
2132 | if (obj_load_order_prio(*p) < prio) | ||
2133 | break; | ||
2134 | sec->load_next = *p; | ||
2135 | *p = sec; | ||
2136 | } | ||
2137 | |||
2138 | niro | 984 | static struct obj_section *helper_create_alloced_section(struct obj_file *f, |
2139 | const char *name, | ||
2140 | unsigned long align, | ||
2141 | unsigned long size) | ||
2142 | niro | 816 | { |
2143 | int newidx = f->header.e_shnum++; | ||
2144 | struct obj_section *sec; | ||
2145 | |||
2146 | f->sections = xrealloc_vector(f->sections, 2, newidx); | ||
2147 | f->sections[newidx] = sec = arch_new_section(); | ||
2148 | |||
2149 | sec->header.sh_type = SHT_PROGBITS; | ||
2150 | sec->header.sh_flags = SHF_WRITE | SHF_ALLOC; | ||
2151 | sec->header.sh_size = size; | ||
2152 | sec->header.sh_addralign = align; | ||
2153 | sec->name = name; | ||
2154 | sec->idx = newidx; | ||
2155 | if (size) | ||
2156 | sec->contents = xzalloc(size); | ||
2157 | |||
2158 | niro | 984 | return sec; |
2159 | } | ||
2160 | |||
2161 | static struct obj_section *obj_create_alloced_section(struct obj_file *f, | ||
2162 | const char *name, | ||
2163 | unsigned long align, | ||
2164 | unsigned long size) | ||
2165 | { | ||
2166 | struct obj_section *sec; | ||
2167 | |||
2168 | sec = helper_create_alloced_section(f, name, align, size); | ||
2169 | niro | 816 | obj_insert_section_load_order(f, sec); |
2170 | return sec; | ||
2171 | } | ||
2172 | |||
2173 | static struct obj_section *obj_create_alloced_section_first(struct obj_file *f, | ||
2174 | niro | 984 | const char *name, |
2175 | unsigned long align, | ||
2176 | unsigned long size) | ||
2177 | niro | 816 | { |
2178 | struct obj_section *sec; | ||
2179 | |||
2180 | niro | 984 | sec = helper_create_alloced_section(f, name, align, size); |
2181 | niro | 816 | sec->load_next = f->load_order; |
2182 | f->load_order = sec; | ||
2183 | if (f->load_order_search_start == &f->load_order) | ||
2184 | f->load_order_search_start = &sec->load_next; | ||
2185 | |||
2186 | return sec; | ||
2187 | } | ||
2188 | |||
2189 | static void *obj_extend_section(struct obj_section *sec, unsigned long more) | ||
2190 | { | ||
2191 | unsigned long oldsize = sec->header.sh_size; | ||
2192 | if (more) { | ||
2193 | sec->header.sh_size += more; | ||
2194 | sec->contents = xrealloc(sec->contents, sec->header.sh_size); | ||
2195 | } | ||
2196 | return sec->contents + oldsize; | ||
2197 | } | ||
2198 | |||
2199 | |||
2200 | /* Conditionally add the symbols from the given symbol set to the | ||
2201 | new module. */ | ||
2202 | |||
2203 | niro | 984 | static int add_symbols_from(struct obj_file *f, |
2204 | int idx, | ||
2205 | struct new_module_symbol *syms, | ||
2206 | size_t nsyms) | ||
2207 | niro | 816 | { |
2208 | struct new_module_symbol *s; | ||
2209 | size_t i; | ||
2210 | int used = 0; | ||
2211 | #ifdef SYMBOL_PREFIX | ||
2212 | niro | 984 | char *name_buf = NULL; |
2213 | niro | 816 | size_t name_alloced_size = 0; |
2214 | #endif | ||
2215 | #if ENABLE_FEATURE_CHECK_TAINTED_MODULE | ||
2216 | int gpl; | ||
2217 | |||
2218 | gpl = obj_gpl_license(f, NULL) == 0; | ||
2219 | #endif | ||
2220 | for (i = 0, s = syms; i < nsyms; ++i, ++s) { | ||
2221 | /* Only add symbols that are already marked external. | ||
2222 | If we override locals we may cause problems for | ||
2223 | argument initialization. We will also create a false | ||
2224 | dependency on the module. */ | ||
2225 | struct obj_symbol *sym; | ||
2226 | char *name; | ||
2227 | |||
2228 | /* GPL licensed modules can use symbols exported with | ||
2229 | * EXPORT_SYMBOL_GPL, so ignore any GPLONLY_ prefix on the | ||
2230 | * exported names. Non-GPL modules never see any GPLONLY_ | ||
2231 | * symbols so they cannot fudge it by adding the prefix on | ||
2232 | * their references. | ||
2233 | */ | ||
2234 | if (strncmp((char *)s->name, "GPLONLY_", 8) == 0) { | ||
2235 | #if ENABLE_FEATURE_CHECK_TAINTED_MODULE | ||
2236 | if (gpl) | ||
2237 | s->name += 8; | ||
2238 | else | ||
2239 | #endif | ||
2240 | continue; | ||
2241 | } | ||
2242 | name = (char *)s->name; | ||
2243 | |||
2244 | #ifdef SYMBOL_PREFIX | ||
2245 | /* Prepend SYMBOL_PREFIX to the symbol's name (the | ||
2246 | kernel exports `C names', but module object files | ||
2247 | reference `linker names'). */ | ||
2248 | size_t extra = sizeof SYMBOL_PREFIX; | ||
2249 | size_t name_size = strlen(name) + extra; | ||
2250 | if (name_size > name_alloced_size) { | ||
2251 | name_alloced_size = name_size * 2; | ||
2252 | name_buf = alloca(name_alloced_size); | ||
2253 | } | ||
2254 | strcpy(name_buf, SYMBOL_PREFIX); | ||
2255 | strcpy(name_buf + extra - 1, name); | ||
2256 | name = name_buf; | ||
2257 | niro | 984 | #endif |
2258 | niro | 816 | |
2259 | sym = obj_find_symbol(f, name); | ||
2260 | if (sym && !(ELF_ST_BIND(sym->info) == STB_LOCAL)) { | ||
2261 | #ifdef SYMBOL_PREFIX | ||
2262 | /* Put NAME_BUF into more permanent storage. */ | ||
2263 | name = xmalloc(name_size); | ||
2264 | strcpy(name, name_buf); | ||
2265 | #endif | ||
2266 | sym = obj_add_symbol(f, name, -1, | ||
2267 | ELF_ST_INFO(STB_GLOBAL, | ||
2268 | STT_NOTYPE), | ||
2269 | idx, s->value, 0); | ||
2270 | /* Did our symbol just get installed? If so, mark the | ||
2271 | module as "used". */ | ||
2272 | if (sym->secidx == idx) | ||
2273 | used = 1; | ||
2274 | } | ||
2275 | } | ||
2276 | |||
2277 | return used; | ||
2278 | } | ||
2279 | |||
2280 | static void add_kernel_symbols(struct obj_file *f) | ||
2281 | { | ||
2282 | struct external_module *m; | ||
2283 | int i, nused = 0; | ||
2284 | |||
2285 | /* Add module symbols first. */ | ||
2286 | |||
2287 | for (i = 0, m = ext_modules; i < n_ext_modules; ++i, ++m) { | ||
2288 | if (m->nsyms | ||
2289 | && add_symbols_from(f, SHN_HIRESERVE + 2 + i, m->syms, m->nsyms) | ||
2290 | ) { | ||
2291 | m->used = 1; | ||
2292 | ++nused; | ||
2293 | } | ||
2294 | } | ||
2295 | |||
2296 | n_ext_modules_used = nused; | ||
2297 | |||
2298 | /* And finally the symbols from the kernel proper. */ | ||
2299 | |||
2300 | if (nksyms) | ||
2301 | add_symbols_from(f, SHN_HIRESERVE + 1, ksyms, nksyms); | ||
2302 | } | ||
2303 | |||
2304 | static char *get_modinfo_value(struct obj_file *f, const char *key) | ||
2305 | { | ||
2306 | struct obj_section *sec; | ||
2307 | char *p, *v, *n, *ep; | ||
2308 | size_t klen = strlen(key); | ||
2309 | |||
2310 | sec = obj_find_section(f, ".modinfo"); | ||
2311 | if (sec == NULL) | ||
2312 | return NULL; | ||
2313 | p = sec->contents; | ||
2314 | ep = p + sec->header.sh_size; | ||
2315 | while (p < ep) { | ||
2316 | v = strchr(p, '='); | ||
2317 | n = strchr(p, '\0'); | ||
2318 | if (v) { | ||
2319 | if (p + klen == v && strncmp(p, key, klen) == 0) | ||
2320 | return v + 1; | ||
2321 | } else { | ||
2322 | if (p + klen == n && strcmp(p, key) == 0) | ||
2323 | return n; | ||
2324 | } | ||
2325 | p = n + 1; | ||
2326 | } | ||
2327 | |||
2328 | return NULL; | ||
2329 | } | ||
2330 | |||
2331 | |||
2332 | /*======================================================================*/ | ||
2333 | /* Functions relating to module loading after 2.1.18. */ | ||
2334 | |||
2335 | /* From Linux-2.6 sources */ | ||
2336 | /* You can use " around spaces, but can't escape ". */ | ||
2337 | /* Hyphens and underscores equivalent in parameter names. */ | ||
2338 | static char *next_arg(char *args, char **param, char **val) | ||
2339 | { | ||
2340 | unsigned int i, equals = 0; | ||
2341 | int in_quote = 0, quoted = 0; | ||
2342 | char *next; | ||
2343 | |||
2344 | if (*args == '"') { | ||
2345 | args++; | ||
2346 | in_quote = 1; | ||
2347 | quoted = 1; | ||
2348 | } | ||
2349 | |||
2350 | for (i = 0; args[i]; i++) { | ||
2351 | if (args[i] == ' ' && !in_quote) | ||
2352 | break; | ||
2353 | if (equals == 0) { | ||
2354 | if (args[i] == '=') | ||
2355 | equals = i; | ||
2356 | } | ||
2357 | if (args[i] == '"') | ||
2358 | in_quote = !in_quote; | ||
2359 | } | ||
2360 | |||
2361 | *param = args; | ||
2362 | if (!equals) | ||
2363 | *val = NULL; | ||
2364 | else { | ||
2365 | args[equals] = '\0'; | ||
2366 | *val = args + equals + 1; | ||
2367 | |||
2368 | /* Don't include quotes in value. */ | ||
2369 | if (**val == '"') { | ||
2370 | (*val)++; | ||
2371 | if (args[i-1] == '"') | ||
2372 | args[i-1] = '\0'; | ||
2373 | } | ||
2374 | if (quoted && args[i-1] == '"') | ||
2375 | args[i-1] = '\0'; | ||
2376 | } | ||
2377 | |||
2378 | if (args[i]) { | ||
2379 | args[i] = '\0'; | ||
2380 | next = args + i + 1; | ||
2381 | } else | ||
2382 | next = args + i; | ||
2383 | |||
2384 | /* Chew up trailing spaces. */ | ||
2385 | return skip_whitespace(next); | ||
2386 | } | ||
2387 | |||
2388 | static void | ||
2389 | new_process_module_arguments(struct obj_file *f, const char *options) | ||
2390 | { | ||
2391 | char *xoptions, *pos; | ||
2392 | char *param, *val; | ||
2393 | |||
2394 | xoptions = pos = xstrdup(skip_whitespace(options)); | ||
2395 | while (*pos) { | ||
2396 | unsigned long charssize = 0; | ||
2397 | char *tmp, *contents, *loc, *pinfo, *p; | ||
2398 | struct obj_symbol *sym; | ||
2399 | int min, max, n, len; | ||
2400 | |||
2401 | pos = next_arg(pos, ¶m, &val); | ||
2402 | |||
2403 | tmp = xasprintf("parm_%s", param); | ||
2404 | pinfo = get_modinfo_value(f, tmp); | ||
2405 | free(tmp); | ||
2406 | if (pinfo == NULL) | ||
2407 | bb_error_msg_and_die("invalid parameter %s", param); | ||
2408 | |||
2409 | #ifdef SYMBOL_PREFIX | ||
2410 | tmp = xasprintf(SYMBOL_PREFIX "%s", param); | ||
2411 | sym = obj_find_symbol(f, tmp); | ||
2412 | free(tmp); | ||
2413 | #else | ||
2414 | sym = obj_find_symbol(f, param); | ||
2415 | #endif | ||
2416 | |||
2417 | /* Also check that the parameter was not resolved from the kernel. */ | ||
2418 | if (sym == NULL || sym->secidx > SHN_HIRESERVE) | ||
2419 | bb_error_msg_and_die("symbol for parameter %s not found", param); | ||
2420 | |||
2421 | /* Number of parameters */ | ||
2422 | if (isdigit(*pinfo)) { | ||
2423 | min = strtoul(pinfo, &pinfo, 10); | ||
2424 | if (*pinfo == '-') | ||
2425 | max = strtoul(pinfo + 1, &pinfo, 10); | ||
2426 | else | ||
2427 | max = min; | ||
2428 | } else | ||
2429 | min = max = 1; | ||
2430 | |||
2431 | contents = f->sections[sym->secidx]->contents; | ||
2432 | loc = contents + sym->value; | ||
2433 | |||
2434 | if (*pinfo == 'c') { | ||
2435 | niro | 984 | if (!isdigit(pinfo[1])) { |
2436 | niro | 816 | bb_error_msg_and_die("parameter type 'c' for %s must be followed by" |
2437 | " the maximum size", param); | ||
2438 | } | ||
2439 | niro | 984 | charssize = strtoul(pinfo + 1, NULL, 10); |
2440 | niro | 816 | } |
2441 | |||
2442 | if (val == NULL) { | ||
2443 | if (*pinfo != 'b') | ||
2444 | bb_error_msg_and_die("argument expected for parameter %s", param); | ||
2445 | val = (char *) "1"; | ||
2446 | } | ||
2447 | |||
2448 | /* Parse parameter values */ | ||
2449 | n = 0; | ||
2450 | p = val; | ||
2451 | while (*p != 0) { | ||
2452 | niro | 984 | char *endp; |
2453 | |||
2454 | niro | 816 | if (++n > max) |
2455 | bb_error_msg_and_die("too many values for %s (max %d)", param, max); | ||
2456 | |||
2457 | switch (*pinfo) { | ||
2458 | case 's': | ||
2459 | len = strcspn(p, ","); | ||
2460 | p[len] = 0; | ||
2461 | obj_string_patch(f, sym->secidx, | ||
2462 | loc - contents, p); | ||
2463 | loc += tgt_sizeof_char_p; | ||
2464 | p += len; | ||
2465 | break; | ||
2466 | case 'c': | ||
2467 | len = strcspn(p, ","); | ||
2468 | p[len] = 0; | ||
2469 | if (len >= charssize) | ||
2470 | bb_error_msg_and_die("string too long for %s (max %ld)", param, | ||
2471 | charssize - 1); | ||
2472 | strcpy((char *) loc, p); | ||
2473 | loc += charssize; | ||
2474 | p += len; | ||
2475 | break; | ||
2476 | case 'b': | ||
2477 | niro | 984 | *loc++ = strtoul(p, &endp, 0); |
2478 | p = endp; /* gcc likes temp var for &endp */ | ||
2479 | niro | 816 | break; |
2480 | case 'h': | ||
2481 | niro | 984 | *(short *) loc = strtoul(p, &endp, 0); |
2482 | niro | 816 | loc += tgt_sizeof_short; |
2483 | niro | 984 | p = endp; |
2484 | niro | 816 | break; |
2485 | case 'i': | ||
2486 | niro | 984 | *(int *) loc = strtoul(p, &endp, 0); |
2487 | niro | 816 | loc += tgt_sizeof_int; |
2488 | niro | 984 | p = endp; |
2489 | niro | 816 | break; |
2490 | case 'l': | ||
2491 | niro | 984 | *(long *) loc = strtoul(p, &endp, 0); |
2492 | niro | 816 | loc += tgt_sizeof_long; |
2493 | niro | 984 | p = endp; |
2494 | niro | 816 | break; |
2495 | default: | ||
2496 | bb_error_msg_and_die("unknown parameter type '%c' for %s", | ||
2497 | *pinfo, param); | ||
2498 | } | ||
2499 | |||
2500 | p = skip_whitespace(p); | ||
2501 | if (*p != ',') | ||
2502 | break; | ||
2503 | p = skip_whitespace(p + 1); | ||
2504 | } | ||
2505 | |||
2506 | if (n < min) | ||
2507 | bb_error_msg_and_die("parameter %s requires at least %d arguments", param, min); | ||
2508 | if (*p != '\0') | ||
2509 | bb_error_msg_and_die("invalid argument syntax for %s", param); | ||
2510 | } | ||
2511 | |||
2512 | free(xoptions); | ||
2513 | } | ||
2514 | |||
2515 | #if ENABLE_FEATURE_INSMOD_VERSION_CHECKING | ||
2516 | static int new_is_module_checksummed(struct obj_file *f) | ||
2517 | { | ||
2518 | const char *p = get_modinfo_value(f, "using_checksums"); | ||
2519 | if (p) | ||
2520 | return xatoi(p); | ||
2521 | return 0; | ||
2522 | } | ||
2523 | |||
2524 | /* Get the module's kernel version in the canonical integer form. */ | ||
2525 | |||
2526 | static int | ||
2527 | new_get_module_version(struct obj_file *f, char str[STRVERSIONLEN]) | ||
2528 | { | ||
2529 | char *p, *q; | ||
2530 | int a, b, c; | ||
2531 | |||
2532 | p = get_modinfo_value(f, "kernel_version"); | ||
2533 | if (p == NULL) | ||
2534 | return -1; | ||
2535 | safe_strncpy(str, p, STRVERSIONLEN); | ||
2536 | |||
2537 | a = strtoul(p, &p, 10); | ||
2538 | if (*p != '.') | ||
2539 | return -1; | ||
2540 | b = strtoul(p + 1, &p, 10); | ||
2541 | if (*p != '.') | ||
2542 | return -1; | ||
2543 | c = strtoul(p + 1, &q, 10); | ||
2544 | if (p + 1 == q) | ||
2545 | return -1; | ||
2546 | |||
2547 | return a << 16 | b << 8 | c; | ||
2548 | } | ||
2549 | |||
2550 | #endif /* FEATURE_INSMOD_VERSION_CHECKING */ | ||
2551 | |||
2552 | |||
2553 | /* Fetch the loaded modules, and all currently exported symbols. */ | ||
2554 | |||
2555 | static void new_get_kernel_symbols(void) | ||
2556 | { | ||
2557 | char *module_names, *mn; | ||
2558 | struct external_module *modules, *m; | ||
2559 | struct new_module_symbol *syms, *s; | ||
2560 | size_t ret, bufsize, nmod, nsyms, i, j; | ||
2561 | |||
2562 | /* Collect the loaded modules. */ | ||
2563 | |||
2564 | bufsize = 256; | ||
2565 | module_names = xmalloc(bufsize); | ||
2566 | |||
2567 | retry_modules_load: | ||
2568 | if (query_module(NULL, QM_MODULES, module_names, bufsize, &ret)) { | ||
2569 | if (errno == ENOSPC && bufsize < ret) { | ||
2570 | bufsize = ret; | ||
2571 | module_names = xrealloc(module_names, bufsize); | ||
2572 | goto retry_modules_load; | ||
2573 | } | ||
2574 | bb_perror_msg_and_die("QM_MODULES"); | ||
2575 | } | ||
2576 | |||
2577 | n_ext_modules = nmod = ret; | ||
2578 | |||
2579 | /* Collect the modules' symbols. */ | ||
2580 | |||
2581 | if (nmod) { | ||
2582 | ext_modules = modules = xzalloc(nmod * sizeof(*modules)); | ||
2583 | for (i = 0, mn = module_names, m = modules; | ||
2584 | i < nmod; ++i, ++m, mn += strlen(mn) + 1) { | ||
2585 | struct new_module_info info; | ||
2586 | |||
2587 | if (query_module(mn, QM_INFO, &info, sizeof(info), &ret)) { | ||
2588 | if (errno == ENOENT) { | ||
2589 | /* The module was removed out from underneath us. */ | ||
2590 | continue; | ||
2591 | } | ||
2592 | bb_perror_msg_and_die("query_module: QM_INFO: %s", mn); | ||
2593 | } | ||
2594 | |||
2595 | bufsize = 1024; | ||
2596 | syms = xmalloc(bufsize); | ||
2597 | retry_mod_sym_load: | ||
2598 | if (query_module(mn, QM_SYMBOLS, syms, bufsize, &ret)) { | ||
2599 | switch (errno) { | ||
2600 | case ENOSPC: | ||
2601 | bufsize = ret; | ||
2602 | syms = xrealloc(syms, bufsize); | ||
2603 | goto retry_mod_sym_load; | ||
2604 | case ENOENT: | ||
2605 | /* The module was removed out from underneath us. */ | ||
2606 | continue; | ||
2607 | default: | ||
2608 | bb_perror_msg_and_die("query_module: QM_SYMBOLS: %s", mn); | ||
2609 | } | ||
2610 | } | ||
2611 | nsyms = ret; | ||
2612 | |||
2613 | m->name = mn; | ||
2614 | m->addr = info.addr; | ||
2615 | m->nsyms = nsyms; | ||
2616 | m->syms = syms; | ||
2617 | |||
2618 | for (j = 0, s = syms; j < nsyms; ++j, ++s) { | ||
2619 | s->name += (unsigned long) syms; | ||
2620 | } | ||
2621 | } | ||
2622 | } | ||
2623 | |||
2624 | /* Collect the kernel's symbols. */ | ||
2625 | |||
2626 | niro | 984 | bufsize = 16 * 1024; |
2627 | syms = xmalloc(bufsize); | ||
2628 | niro | 816 | retry_kern_sym_load: |
2629 | if (query_module(NULL, QM_SYMBOLS, syms, bufsize, &ret)) { | ||
2630 | if (errno == ENOSPC && bufsize < ret) { | ||
2631 | bufsize = ret; | ||
2632 | syms = xrealloc(syms, bufsize); | ||
2633 | goto retry_kern_sym_load; | ||
2634 | } | ||
2635 | bb_perror_msg_and_die("kernel: QM_SYMBOLS"); | ||
2636 | } | ||
2637 | nksyms = nsyms = ret; | ||
2638 | ksyms = syms; | ||
2639 | |||
2640 | for (j = 0, s = syms; j < nsyms; ++j, ++s) { | ||
2641 | s->name += (unsigned long) syms; | ||
2642 | } | ||
2643 | } | ||
2644 | |||
2645 | |||
2646 | /* Return the kernel symbol checksum version, or zero if not used. */ | ||
2647 | |||
2648 | static int new_is_kernel_checksummed(void) | ||
2649 | { | ||
2650 | struct new_module_symbol *s; | ||
2651 | size_t i; | ||
2652 | |||
2653 | /* Using_Versions is not the first symbol, but it should be in there. */ | ||
2654 | |||
2655 | for (i = 0, s = ksyms; i < nksyms; ++i, ++s) | ||
2656 | if (strcmp((char *) s->name, "Using_Versions") == 0) | ||
2657 | return s->value; | ||
2658 | |||
2659 | return 0; | ||
2660 | } | ||
2661 | |||
2662 | |||
2663 | static void new_create_this_module(struct obj_file *f, const char *m_name) | ||
2664 | { | ||
2665 | struct obj_section *sec; | ||
2666 | |||
2667 | sec = obj_create_alloced_section_first(f, ".this", tgt_sizeof_long, | ||
2668 | sizeof(struct new_module)); | ||
2669 | /* done by obj_create_alloced_section_first: */ | ||
2670 | /*memset(sec->contents, 0, sizeof(struct new_module));*/ | ||
2671 | |||
2672 | obj_add_symbol(f, SPFX "__this_module", -1, | ||
2673 | ELF_ST_INFO(STB_LOCAL, STT_OBJECT), sec->idx, 0, | ||
2674 | sizeof(struct new_module)); | ||
2675 | |||
2676 | obj_string_patch(f, sec->idx, offsetof(struct new_module, name), | ||
2677 | m_name); | ||
2678 | } | ||
2679 | |||
2680 | #if ENABLE_FEATURE_INSMOD_KSYMOOPS_SYMBOLS | ||
2681 | /* add an entry to the __ksymtab section, creating it if necessary */ | ||
2682 | static void new_add_ksymtab(struct obj_file *f, struct obj_symbol *sym) | ||
2683 | { | ||
2684 | struct obj_section *sec; | ||
2685 | ElfW(Addr) ofs; | ||
2686 | |||
2687 | /* ensure __ksymtab is allocated, EXPORT_NOSYMBOLS creates a non-alloc section. | ||
2688 | * If __ksymtab is defined but not marked alloc, x out the first character | ||
2689 | * (no obj_delete routine) and create a new __ksymtab with the correct | ||
2690 | * characteristics. | ||
2691 | */ | ||
2692 | sec = obj_find_section(f, "__ksymtab"); | ||
2693 | if (sec && !(sec->header.sh_flags & SHF_ALLOC)) { | ||
2694 | *((char *)(sec->name)) = 'x'; /* override const */ | ||
2695 | sec = NULL; | ||
2696 | } | ||
2697 | if (!sec) | ||
2698 | sec = obj_create_alloced_section(f, "__ksymtab", | ||
2699 | tgt_sizeof_void_p, 0); | ||
2700 | if (!sec) | ||
2701 | return; | ||
2702 | sec->header.sh_flags |= SHF_ALLOC; | ||
2703 | /* Empty section might be byte-aligned */ | ||
2704 | sec->header.sh_addralign = tgt_sizeof_void_p; | ||
2705 | ofs = sec->header.sh_size; | ||
2706 | obj_symbol_patch(f, sec->idx, ofs, sym); | ||
2707 | obj_string_patch(f, sec->idx, ofs + tgt_sizeof_void_p, sym->name); | ||
2708 | obj_extend_section(sec, 2 * tgt_sizeof_char_p); | ||
2709 | } | ||
2710 | #endif /* FEATURE_INSMOD_KSYMOOPS_SYMBOLS */ | ||
2711 | |||
2712 | static int new_create_module_ksymtab(struct obj_file *f) | ||
2713 | { | ||
2714 | struct obj_section *sec; | ||
2715 | int i; | ||
2716 | |||
2717 | /* We must always add the module references. */ | ||
2718 | |||
2719 | if (n_ext_modules_used) { | ||
2720 | struct new_module_ref *dep; | ||
2721 | struct obj_symbol *tm; | ||
2722 | |||
2723 | sec = obj_create_alloced_section(f, ".kmodtab", tgt_sizeof_void_p, | ||
2724 | (sizeof(struct new_module_ref) | ||
2725 | * n_ext_modules_used)); | ||
2726 | if (!sec) | ||
2727 | return 0; | ||
2728 | |||
2729 | tm = obj_find_symbol(f, SPFX "__this_module"); | ||
2730 | dep = (struct new_module_ref *) sec->contents; | ||
2731 | for (i = 0; i < n_ext_modules; ++i) | ||
2732 | if (ext_modules[i].used) { | ||
2733 | dep->dep = ext_modules[i].addr; | ||
2734 | obj_symbol_patch(f, sec->idx, | ||
2735 | (char *) &dep->ref - sec->contents, tm); | ||
2736 | dep->next_ref = 0; | ||
2737 | ++dep; | ||
2738 | } | ||
2739 | } | ||
2740 | |||
2741 | if (!flag_noexport && !obj_find_section(f, "__ksymtab")) { | ||
2742 | size_t nsyms; | ||
2743 | int *loaded; | ||
2744 | |||
2745 | sec = obj_create_alloced_section(f, "__ksymtab", tgt_sizeof_void_p, 0); | ||
2746 | |||
2747 | /* We don't want to export symbols residing in sections that | ||
2748 | aren't loaded. There are a number of these created so that | ||
2749 | we make sure certain module options don't appear twice. */ | ||
2750 | niro | 984 | i = f->header.e_shnum; |
2751 | loaded = alloca(sizeof(int) * i); | ||
2752 | niro | 816 | while (--i >= 0) |
2753 | loaded[i] = (f->sections[i]->header.sh_flags & SHF_ALLOC) != 0; | ||
2754 | |||
2755 | for (nsyms = i = 0; i < HASH_BUCKETS; ++i) { | ||
2756 | struct obj_symbol *sym; | ||
2757 | niro | 984 | for (sym = f->symtab[i]; sym; sym = sym->next) { |
2758 | niro | 816 | if (ELF_ST_BIND(sym->info) != STB_LOCAL |
2759 | niro | 984 | && sym->secidx <= SHN_HIRESERVE |
2760 | && (sym->secidx >= SHN_LORESERVE || loaded[sym->secidx]) | ||
2761 | ) { | ||
2762 | niro | 816 | ElfW(Addr) ofs = nsyms * 2 * tgt_sizeof_void_p; |
2763 | |||
2764 | obj_symbol_patch(f, sec->idx, ofs, sym); | ||
2765 | obj_string_patch(f, sec->idx, ofs + tgt_sizeof_void_p, | ||
2766 | sym->name); | ||
2767 | nsyms++; | ||
2768 | } | ||
2769 | niro | 984 | } |
2770 | niro | 816 | } |
2771 | |||
2772 | obj_extend_section(sec, nsyms * 2 * tgt_sizeof_char_p); | ||
2773 | } | ||
2774 | |||
2775 | return 1; | ||
2776 | } | ||
2777 | |||
2778 | |||
2779 | static int | ||
2780 | new_init_module(const char *m_name, struct obj_file *f, unsigned long m_size) | ||
2781 | { | ||
2782 | struct new_module *module; | ||
2783 | struct obj_section *sec; | ||
2784 | void *image; | ||
2785 | int ret; | ||
2786 | tgt_long m_addr; | ||
2787 | |||
2788 | sec = obj_find_section(f, ".this"); | ||
2789 | if (!sec || !sec->contents) { | ||
2790 | bb_perror_msg_and_die("corrupt module %s?", m_name); | ||
2791 | } | ||
2792 | module = (struct new_module *) sec->contents; | ||
2793 | m_addr = sec->header.sh_addr; | ||
2794 | |||
2795 | module->size_of_struct = sizeof(*module); | ||
2796 | module->size = m_size; | ||
2797 | module->flags = flag_autoclean ? NEW_MOD_AUTOCLEAN : 0; | ||
2798 | |||
2799 | sec = obj_find_section(f, "__ksymtab"); | ||
2800 | if (sec && sec->header.sh_size) { | ||
2801 | module->syms = sec->header.sh_addr; | ||
2802 | module->nsyms = sec->header.sh_size / (2 * tgt_sizeof_char_p); | ||
2803 | } | ||
2804 | |||
2805 | if (n_ext_modules_used) { | ||
2806 | sec = obj_find_section(f, ".kmodtab"); | ||
2807 | module->deps = sec->header.sh_addr; | ||
2808 | module->ndeps = n_ext_modules_used; | ||
2809 | } | ||
2810 | |||
2811 | niro | 984 | module->init = obj_symbol_final_value(f, obj_find_symbol(f, SPFX "init_module")); |
2812 | module->cleanup = obj_symbol_final_value(f, obj_find_symbol(f, SPFX "cleanup_module")); | ||
2813 | niro | 816 | |
2814 | sec = obj_find_section(f, "__ex_table"); | ||
2815 | if (sec) { | ||
2816 | module->ex_table_start = sec->header.sh_addr; | ||
2817 | module->ex_table_end = sec->header.sh_addr + sec->header.sh_size; | ||
2818 | } | ||
2819 | |||
2820 | sec = obj_find_section(f, ".text.init"); | ||
2821 | if (sec) { | ||
2822 | module->runsize = sec->header.sh_addr - m_addr; | ||
2823 | } | ||
2824 | sec = obj_find_section(f, ".data.init"); | ||
2825 | if (sec) { | ||
2826 | niro | 984 | if (!module->runsize |
2827 | || module->runsize > sec->header.sh_addr - m_addr | ||
2828 | ) { | ||
2829 | niro | 816 | module->runsize = sec->header.sh_addr - m_addr; |
2830 | niro | 984 | } |
2831 | niro | 816 | } |
2832 | sec = obj_find_section(f, ARCHDATA_SEC_NAME); | ||
2833 | if (sec && sec->header.sh_size) { | ||
2834 | module->archdata_start = (void*)sec->header.sh_addr; | ||
2835 | module->archdata_end = module->archdata_start + sec->header.sh_size; | ||
2836 | } | ||
2837 | sec = obj_find_section(f, KALLSYMS_SEC_NAME); | ||
2838 | if (sec && sec->header.sh_size) { | ||
2839 | module->kallsyms_start = (void*)sec->header.sh_addr; | ||
2840 | module->kallsyms_end = module->kallsyms_start + sec->header.sh_size; | ||
2841 | } | ||
2842 | |||
2843 | /* Whew! All of the initialization is complete. Collect the final | ||
2844 | module image and give it to the kernel. */ | ||
2845 | |||
2846 | image = xmalloc(m_size); | ||
2847 | obj_create_image(f, image); | ||
2848 | |||
2849 | ret = init_module(m_name, (struct new_module *) image); | ||
2850 | if (ret) | ||
2851 | bb_perror_msg("init_module: %s", m_name); | ||
2852 | |||
2853 | free(image); | ||
2854 | |||
2855 | return ret == 0; | ||
2856 | } | ||
2857 | |||
2858 | |||
2859 | /*======================================================================*/ | ||
2860 | |||
2861 | static void | ||
2862 | obj_string_patch(struct obj_file *f, int secidx, ElfW(Addr) offset, | ||
2863 | const char *string) | ||
2864 | { | ||
2865 | struct obj_string_patch *p; | ||
2866 | struct obj_section *strsec; | ||
2867 | size_t len = strlen(string) + 1; | ||
2868 | char *loc; | ||
2869 | |||
2870 | niro | 984 | p = xzalloc(sizeof(*p)); |
2871 | niro | 816 | p->next = f->string_patches; |
2872 | p->reloc_secidx = secidx; | ||
2873 | p->reloc_offset = offset; | ||
2874 | f->string_patches = p; | ||
2875 | |||
2876 | strsec = obj_find_section(f, ".kstrtab"); | ||
2877 | if (strsec == NULL) { | ||
2878 | strsec = obj_create_alloced_section(f, ".kstrtab", 1, len); | ||
2879 | niro | 984 | /*p->string_offset = 0;*/ |
2880 | niro | 816 | loc = strsec->contents; |
2881 | } else { | ||
2882 | p->string_offset = strsec->header.sh_size; | ||
2883 | loc = obj_extend_section(strsec, len); | ||
2884 | } | ||
2885 | memcpy(loc, string, len); | ||
2886 | } | ||
2887 | |||
2888 | static void | ||
2889 | obj_symbol_patch(struct obj_file *f, int secidx, ElfW(Addr) offset, | ||
2890 | niro | 984 | struct obj_symbol *sym) |
2891 | niro | 816 | { |
2892 | struct obj_symbol_patch *p; | ||
2893 | |||
2894 | p = xmalloc(sizeof(*p)); | ||
2895 | p->next = f->symbol_patches; | ||
2896 | p->reloc_secidx = secidx; | ||
2897 | p->reloc_offset = offset; | ||
2898 | p->sym = sym; | ||
2899 | f->symbol_patches = p; | ||
2900 | } | ||
2901 | |||
2902 | static void obj_check_undefineds(struct obj_file *f) | ||
2903 | { | ||
2904 | unsigned i; | ||
2905 | |||
2906 | for (i = 0; i < HASH_BUCKETS; ++i) { | ||
2907 | struct obj_symbol *sym; | ||
2908 | niro | 984 | for (sym = f->symtab[i]; sym; sym = sym->next) { |
2909 | niro | 816 | if (sym->secidx == SHN_UNDEF) { |
2910 | if (ELF_ST_BIND(sym->info) == STB_WEAK) { | ||
2911 | sym->secidx = SHN_ABS; | ||
2912 | sym->value = 0; | ||
2913 | } else { | ||
2914 | if (!flag_quiet) | ||
2915 | bb_error_msg_and_die("unresolved symbol %s", sym->name); | ||
2916 | } | ||
2917 | } | ||
2918 | niro | 984 | } |
2919 | niro | 816 | } |
2920 | } | ||
2921 | |||
2922 | static void obj_allocate_commons(struct obj_file *f) | ||
2923 | { | ||
2924 | struct common_entry { | ||
2925 | struct common_entry *next; | ||
2926 | struct obj_symbol *sym; | ||
2927 | } *common_head = NULL; | ||
2928 | |||
2929 | unsigned long i; | ||
2930 | |||
2931 | for (i = 0; i < HASH_BUCKETS; ++i) { | ||
2932 | struct obj_symbol *sym; | ||
2933 | niro | 984 | for (sym = f->symtab[i]; sym; sym = sym->next) { |
2934 | niro | 816 | if (sym->secidx == SHN_COMMON) { |
2935 | /* Collect all COMMON symbols and sort them by size so as to | ||
2936 | minimize space wasted by alignment requirements. */ | ||
2937 | niro | 984 | struct common_entry **p, *n; |
2938 | for (p = &common_head; *p; p = &(*p)->next) | ||
2939 | if (sym->size <= (*p)->sym->size) | ||
2940 | break; | ||
2941 | n = alloca(sizeof(*n)); | ||
2942 | n->next = *p; | ||
2943 | n->sym = sym; | ||
2944 | *p = n; | ||
2945 | niro | 816 | } |
2946 | niro | 984 | } |
2947 | niro | 816 | } |
2948 | |||
2949 | for (i = 1; i < f->local_symtab_size; ++i) { | ||
2950 | struct obj_symbol *sym = f->local_symtab[i]; | ||
2951 | if (sym && sym->secidx == SHN_COMMON) { | ||
2952 | struct common_entry **p, *n; | ||
2953 | niro | 984 | for (p = &common_head; *p; p = &(*p)->next) { |
2954 | niro | 816 | if (sym == (*p)->sym) |
2955 | break; | ||
2956 | niro | 984 | if (sym->size < (*p)->sym->size) { |
2957 | niro | 816 | n = alloca(sizeof(*n)); |
2958 | n->next = *p; | ||
2959 | n->sym = sym; | ||
2960 | *p = n; | ||
2961 | break; | ||
2962 | } | ||
2963 | niro | 984 | } |
2964 | niro | 816 | } |
2965 | } | ||
2966 | |||
2967 | if (common_head) { | ||
2968 | /* Find the bss section. */ | ||
2969 | for (i = 0; i < f->header.e_shnum; ++i) | ||
2970 | if (f->sections[i]->header.sh_type == SHT_NOBITS) | ||
2971 | break; | ||
2972 | |||
2973 | /* If for some reason there hadn't been one, create one. */ | ||
2974 | if (i == f->header.e_shnum) { | ||
2975 | struct obj_section *sec; | ||
2976 | |||
2977 | f->header.e_shnum++; | ||
2978 | f->sections = xrealloc_vector(f->sections, 2, i); | ||
2979 | f->sections[i] = sec = arch_new_section(); | ||
2980 | |||
2981 | sec->header.sh_type = SHT_PROGBITS; | ||
2982 | sec->header.sh_flags = SHF_WRITE | SHF_ALLOC; | ||
2983 | sec->name = ".bss"; | ||
2984 | sec->idx = i; | ||
2985 | } | ||
2986 | |||
2987 | /* Allocate the COMMONS. */ | ||
2988 | { | ||
2989 | ElfW(Addr) bss_size = f->sections[i]->header.sh_size; | ||
2990 | ElfW(Addr) max_align = f->sections[i]->header.sh_addralign; | ||
2991 | struct common_entry *c; | ||
2992 | |||
2993 | for (c = common_head; c; c = c->next) { | ||
2994 | ElfW(Addr) align = c->sym->value; | ||
2995 | |||
2996 | if (align > max_align) | ||
2997 | max_align = align; | ||
2998 | if (bss_size & (align - 1)) | ||
2999 | bss_size = (bss_size | (align - 1)) + 1; | ||
3000 | |||
3001 | c->sym->secidx = i; | ||
3002 | c->sym->value = bss_size; | ||
3003 | |||
3004 | bss_size += c->sym->size; | ||
3005 | } | ||
3006 | |||
3007 | f->sections[i]->header.sh_size = bss_size; | ||
3008 | f->sections[i]->header.sh_addralign = max_align; | ||
3009 | } | ||
3010 | } | ||
3011 | |||
3012 | /* For the sake of patch relocation and parameter initialization, | ||
3013 | allocate zeroed data for NOBITS sections now. Note that after | ||
3014 | this we cannot assume NOBITS are really empty. */ | ||
3015 | for (i = 0; i < f->header.e_shnum; ++i) { | ||
3016 | struct obj_section *s = f->sections[i]; | ||
3017 | if (s->header.sh_type == SHT_NOBITS) { | ||
3018 | s->contents = NULL; | ||
3019 | if (s->header.sh_size != 0) | ||
3020 | s->contents = xzalloc(s->header.sh_size); | ||
3021 | s->header.sh_type = SHT_PROGBITS; | ||
3022 | } | ||
3023 | } | ||
3024 | } | ||
3025 | |||
3026 | static unsigned long obj_load_size(struct obj_file *f) | ||
3027 | { | ||
3028 | unsigned long dot = 0; | ||
3029 | struct obj_section *sec; | ||
3030 | |||
3031 | /* Finalize the positions of the sections relative to one another. */ | ||
3032 | |||
3033 | for (sec = f->load_order; sec; sec = sec->load_next) { | ||
3034 | ElfW(Addr) align; | ||
3035 | |||
3036 | align = sec->header.sh_addralign; | ||
3037 | if (align && (dot & (align - 1))) | ||
3038 | dot = (dot | (align - 1)) + 1; | ||
3039 | |||
3040 | sec->header.sh_addr = dot; | ||
3041 | dot += sec->header.sh_size; | ||
3042 | } | ||
3043 | |||
3044 | return dot; | ||
3045 | } | ||
3046 | |||
3047 | static int obj_relocate(struct obj_file *f, ElfW(Addr) base) | ||
3048 | { | ||
3049 | int i, n = f->header.e_shnum; | ||
3050 | int ret = 1; | ||
3051 | |||
3052 | /* Finalize the addresses of the sections. */ | ||
3053 | |||
3054 | f->baseaddr = base; | ||
3055 | for (i = 0; i < n; ++i) | ||
3056 | f->sections[i]->header.sh_addr += base; | ||
3057 | |||
3058 | /* And iterate over all of the relocations. */ | ||
3059 | |||
3060 | for (i = 0; i < n; ++i) { | ||
3061 | struct obj_section *relsec, *symsec, *targsec, *strsec; | ||
3062 | ElfW(RelM) * rel, *relend; | ||
3063 | ElfW(Sym) * symtab; | ||
3064 | const char *strtab; | ||
3065 | |||
3066 | relsec = f->sections[i]; | ||
3067 | if (relsec->header.sh_type != SHT_RELM) | ||
3068 | continue; | ||
3069 | |||
3070 | symsec = f->sections[relsec->header.sh_link]; | ||
3071 | targsec = f->sections[relsec->header.sh_info]; | ||
3072 | strsec = f->sections[symsec->header.sh_link]; | ||
3073 | |||
3074 | rel = (ElfW(RelM) *) relsec->contents; | ||
3075 | relend = rel + (relsec->header.sh_size / sizeof(ElfW(RelM))); | ||
3076 | symtab = (ElfW(Sym) *) symsec->contents; | ||
3077 | strtab = (const char *) strsec->contents; | ||
3078 | |||
3079 | for (; rel < relend; ++rel) { | ||
3080 | ElfW(Addr) value = 0; | ||
3081 | struct obj_symbol *intsym = NULL; | ||
3082 | unsigned long symndx; | ||
3083 | niro | 984 | ElfW(Sym) *extsym = NULL; |
3084 | niro | 816 | const char *errmsg; |
3085 | |||
3086 | /* Attempt to find a value to use for this relocation. */ | ||
3087 | |||
3088 | symndx = ELF_R_SYM(rel->r_info); | ||
3089 | if (symndx) { | ||
3090 | /* Note we've already checked for undefined symbols. */ | ||
3091 | |||
3092 | extsym = &symtab[symndx]; | ||
3093 | if (ELF_ST_BIND(extsym->st_info) == STB_LOCAL) { | ||
3094 | /* Local symbols we look up in the local table to be sure | ||
3095 | we get the one that is really intended. */ | ||
3096 | intsym = f->local_symtab[symndx]; | ||
3097 | } else { | ||
3098 | /* Others we look up in the hash table. */ | ||
3099 | const char *name; | ||
3100 | if (extsym->st_name) | ||
3101 | name = strtab + extsym->st_name; | ||
3102 | else | ||
3103 | name = f->sections[extsym->st_shndx]->name; | ||
3104 | intsym = obj_find_symbol(f, name); | ||
3105 | } | ||
3106 | |||
3107 | value = obj_symbol_final_value(f, intsym); | ||
3108 | intsym->referenced = 1; | ||
3109 | } | ||
3110 | #if SHT_RELM == SHT_RELA | ||
3111 | #if defined(__alpha__) && defined(AXP_BROKEN_GAS) | ||
3112 | /* Work around a nasty GAS bug, that is fixed as of 2.7.0.9. */ | ||
3113 | niro | 984 | if (!extsym || !extsym->st_name |
3114 | || ELF_ST_BIND(extsym->st_info) != STB_LOCAL) | ||
3115 | niro | 816 | #endif |
3116 | value += rel->r_addend; | ||
3117 | #endif | ||
3118 | |||
3119 | /* Do it! */ | ||
3120 | switch (arch_apply_relocation | ||
3121 | (f, targsec, /*symsec,*/ intsym, rel, value) | ||
3122 | ) { | ||
3123 | case obj_reloc_ok: | ||
3124 | break; | ||
3125 | |||
3126 | case obj_reloc_overflow: | ||
3127 | errmsg = "Relocation overflow"; | ||
3128 | goto bad_reloc; | ||
3129 | case obj_reloc_dangerous: | ||
3130 | errmsg = "Dangerous relocation"; | ||
3131 | goto bad_reloc; | ||
3132 | case obj_reloc_unhandled: | ||
3133 | errmsg = "Unhandled relocation"; | ||
3134 | bad_reloc: | ||
3135 | if (extsym) { | ||
3136 | bb_error_msg("%s of type %ld for %s", errmsg, | ||
3137 | (long) ELF_R_TYPE(rel->r_info), | ||
3138 | strtab + extsym->st_name); | ||
3139 | } else { | ||
3140 | bb_error_msg("%s of type %ld", errmsg, | ||
3141 | (long) ELF_R_TYPE(rel->r_info)); | ||
3142 | } | ||
3143 | ret = 0; | ||
3144 | break; | ||
3145 | } | ||
3146 | } | ||
3147 | } | ||
3148 | |||
3149 | /* Finally, take care of the patches. */ | ||
3150 | |||
3151 | if (f->string_patches) { | ||
3152 | struct obj_string_patch *p; | ||
3153 | struct obj_section *strsec; | ||
3154 | ElfW(Addr) strsec_base; | ||
3155 | strsec = obj_find_section(f, ".kstrtab"); | ||
3156 | strsec_base = strsec->header.sh_addr; | ||
3157 | |||
3158 | for (p = f->string_patches; p; p = p->next) { | ||
3159 | struct obj_section *targsec = f->sections[p->reloc_secidx]; | ||
3160 | *(ElfW(Addr) *) (targsec->contents + p->reloc_offset) | ||
3161 | = strsec_base + p->string_offset; | ||
3162 | } | ||
3163 | } | ||
3164 | |||
3165 | if (f->symbol_patches) { | ||
3166 | struct obj_symbol_patch *p; | ||
3167 | |||
3168 | for (p = f->symbol_patches; p; p = p->next) { | ||
3169 | struct obj_section *targsec = f->sections[p->reloc_secidx]; | ||
3170 | *(ElfW(Addr) *) (targsec->contents + p->reloc_offset) | ||
3171 | = obj_symbol_final_value(f, p->sym); | ||
3172 | } | ||
3173 | } | ||
3174 | |||
3175 | return ret; | ||
3176 | } | ||
3177 | |||
3178 | static int obj_create_image(struct obj_file *f, char *image) | ||
3179 | { | ||
3180 | struct obj_section *sec; | ||
3181 | ElfW(Addr) base = f->baseaddr; | ||
3182 | |||
3183 | for (sec = f->load_order; sec; sec = sec->load_next) { | ||
3184 | char *secimg; | ||
3185 | |||
3186 | if (sec->contents == 0 || sec->header.sh_size == 0) | ||
3187 | continue; | ||
3188 | |||
3189 | secimg = image + (sec->header.sh_addr - base); | ||
3190 | |||
3191 | /* Note that we allocated data for NOBITS sections earlier. */ | ||
3192 | memcpy(secimg, sec->contents, sec->header.sh_size); | ||
3193 | } | ||
3194 | |||
3195 | return 1; | ||
3196 | } | ||
3197 | |||
3198 | /*======================================================================*/ | ||
3199 | |||
3200 | niro | 984 | static struct obj_file *obj_load(char *image, size_t image_size, int loadprogbits) |
3201 | niro | 816 | { |
3202 | niro | 984 | #if BB_LITTLE_ENDIAN |
3203 | # define ELFMAG_U32 ((uint32_t)(ELFMAG0 + 0x100 * (ELFMAG1 + (0x100 * (ELFMAG2 + 0x100 * ELFMAG3))))) | ||
3204 | #else | ||
3205 | # define ELFMAG_U32 ((uint32_t)((((ELFMAG0 * 0x100) + ELFMAG1) * 0x100 + ELFMAG2) * 0x100 + ELFMAG3)) | ||
3206 | #endif | ||
3207 | niro | 816 | struct obj_file *f; |
3208 | ElfW(Shdr) * section_headers; | ||
3209 | size_t shnum, i; | ||
3210 | char *shstrtab; | ||
3211 | |||
3212 | /* Read the file header. */ | ||
3213 | |||
3214 | f = arch_new_file(); | ||
3215 | f->symbol_cmp = strcmp; | ||
3216 | f->symbol_hash = obj_elf_hash; | ||
3217 | f->load_order_search_start = &f->load_order; | ||
3218 | |||
3219 | niro | 984 | if (image_size < sizeof(f->header)) |
3220 | bb_error_msg_and_die("error while loading ELF header"); | ||
3221 | memcpy(&f->header, image, sizeof(f->header)); | ||
3222 | niro | 816 | |
3223 | niro | 984 | if (*(uint32_t*)(&f->header.e_ident) != ELFMAG_U32) { |
3224 | niro | 816 | bb_error_msg_and_die("not an ELF file"); |
3225 | } | ||
3226 | if (f->header.e_ident[EI_CLASS] != ELFCLASSM | ||
3227 | niro | 984 | || f->header.e_ident[EI_DATA] != (BB_BIG_ENDIAN ? ELFDATA2MSB : ELFDATA2LSB) |
3228 | || f->header.e_ident[EI_VERSION] != EV_CURRENT | ||
3229 | || !MATCH_MACHINE(f->header.e_machine) | ||
3230 | ) { | ||
3231 | niro | 816 | bb_error_msg_and_die("ELF file not for this architecture"); |
3232 | } | ||
3233 | if (f->header.e_type != ET_REL) { | ||
3234 | bb_error_msg_and_die("ELF file not a relocatable object"); | ||
3235 | } | ||
3236 | |||
3237 | /* Read the section headers. */ | ||
3238 | |||
3239 | if (f->header.e_shentsize != sizeof(ElfW(Shdr))) { | ||
3240 | bb_error_msg_and_die("section header size mismatch: %lu != %lu", | ||
3241 | (unsigned long) f->header.e_shentsize, | ||
3242 | (unsigned long) sizeof(ElfW(Shdr))); | ||
3243 | } | ||
3244 | |||
3245 | shnum = f->header.e_shnum; | ||
3246 | /* Growth of ->sections vector will be done by | ||
3247 | * xrealloc_vector(..., 2, ...), therefore we must allocate | ||
3248 | * at least 2^2 = 4 extra elements here. */ | ||
3249 | f->sections = xzalloc(sizeof(f->sections[0]) * (shnum + 4)); | ||
3250 | |||
3251 | section_headers = alloca(sizeof(ElfW(Shdr)) * shnum); | ||
3252 | niro | 984 | if (image_size < f->header.e_shoff + sizeof(ElfW(Shdr)) * shnum) |
3253 | bb_error_msg_and_die("error while loading section headers"); | ||
3254 | memcpy(section_headers, image + f->header.e_shoff, sizeof(ElfW(Shdr)) * shnum); | ||
3255 | niro | 816 | |
3256 | /* Read the section data. */ | ||
3257 | |||
3258 | for (i = 0; i < shnum; ++i) { | ||
3259 | struct obj_section *sec; | ||
3260 | |||
3261 | f->sections[i] = sec = arch_new_section(); | ||
3262 | |||
3263 | sec->header = section_headers[i]; | ||
3264 | sec->idx = i; | ||
3265 | |||
3266 | if (sec->header.sh_size) { | ||
3267 | switch (sec->header.sh_type) { | ||
3268 | case SHT_NULL: | ||
3269 | case SHT_NOTE: | ||
3270 | case SHT_NOBITS: | ||
3271 | /* ignore */ | ||
3272 | break; | ||
3273 | case SHT_PROGBITS: | ||
3274 | #if LOADBITS | ||
3275 | if (!loadprogbits) { | ||
3276 | sec->contents = NULL; | ||
3277 | break; | ||
3278 | } | ||
3279 | #endif | ||
3280 | case SHT_SYMTAB: | ||
3281 | case SHT_STRTAB: | ||
3282 | case SHT_RELM: | ||
3283 | sec->contents = NULL; | ||
3284 | if (sec->header.sh_size > 0) { | ||
3285 | niro | 984 | sec->contents = xmalloc(sec->header.sh_size); |
3286 | if (image_size < (sec->header.sh_offset + sec->header.sh_size)) | ||
3287 | bb_error_msg_and_die("error while loading section data"); | ||
3288 | memcpy(sec->contents, image + sec->header.sh_offset, sec->header.sh_size); | ||
3289 | niro | 816 | } |
3290 | break; | ||
3291 | #if SHT_RELM == SHT_REL | ||
3292 | case SHT_RELA: | ||
3293 | bb_error_msg_and_die("RELA relocations not supported on this architecture"); | ||
3294 | #else | ||
3295 | case SHT_REL: | ||
3296 | bb_error_msg_and_die("REL relocations not supported on this architecture"); | ||
3297 | #endif | ||
3298 | default: | ||
3299 | if (sec->header.sh_type >= SHT_LOPROC) { | ||
3300 | /* Assume processor specific section types are debug | ||
3301 | info and can safely be ignored. If this is ever not | ||
3302 | the case (Hello MIPS?), don't put ifdefs here but | ||
3303 | create an arch_load_proc_section(). */ | ||
3304 | break; | ||
3305 | } | ||
3306 | |||
3307 | bb_error_msg_and_die("can't handle sections of type %ld", | ||
3308 | (long) sec->header.sh_type); | ||
3309 | } | ||
3310 | } | ||
3311 | } | ||
3312 | |||
3313 | /* Do what sort of interpretation as needed by each section. */ | ||
3314 | |||
3315 | shstrtab = f->sections[f->header.e_shstrndx]->contents; | ||
3316 | |||
3317 | for (i = 0; i < shnum; ++i) { | ||
3318 | struct obj_section *sec = f->sections[i]; | ||
3319 | sec->name = shstrtab + sec->header.sh_name; | ||
3320 | } | ||
3321 | |||
3322 | for (i = 0; i < shnum; ++i) { | ||
3323 | struct obj_section *sec = f->sections[i]; | ||
3324 | |||
3325 | /* .modinfo should be contents only but gcc has no attribute for that. | ||
3326 | * The kernel may have marked .modinfo as ALLOC, ignore this bit. | ||
3327 | */ | ||
3328 | if (strcmp(sec->name, ".modinfo") == 0) | ||
3329 | sec->header.sh_flags &= ~SHF_ALLOC; | ||
3330 | |||
3331 | if (sec->header.sh_flags & SHF_ALLOC) | ||
3332 | obj_insert_section_load_order(f, sec); | ||
3333 | |||
3334 | switch (sec->header.sh_type) { | ||
3335 | case SHT_SYMTAB: | ||
3336 | { | ||
3337 | unsigned long nsym, j; | ||
3338 | char *strtab; | ||
3339 | ElfW(Sym) * sym; | ||
3340 | |||
3341 | if (sec->header.sh_entsize != sizeof(ElfW(Sym))) { | ||
3342 | bb_error_msg_and_die("symbol size mismatch: %lu != %lu", | ||
3343 | (unsigned long) sec->header.sh_entsize, | ||
3344 | (unsigned long) sizeof(ElfW(Sym))); | ||
3345 | } | ||
3346 | |||
3347 | nsym = sec->header.sh_size / sizeof(ElfW(Sym)); | ||
3348 | strtab = f->sections[sec->header.sh_link]->contents; | ||
3349 | sym = (ElfW(Sym) *) sec->contents; | ||
3350 | |||
3351 | /* Allocate space for a table of local symbols. */ | ||
3352 | j = f->local_symtab_size = sec->header.sh_info; | ||
3353 | f->local_symtab = xzalloc(j * sizeof(struct obj_symbol *)); | ||
3354 | |||
3355 | /* Insert all symbols into the hash table. */ | ||
3356 | for (j = 1, ++sym; j < nsym; ++j, ++sym) { | ||
3357 | ElfW(Addr) val = sym->st_value; | ||
3358 | const char *name; | ||
3359 | if (sym->st_name) | ||
3360 | name = strtab + sym->st_name; | ||
3361 | else if (sym->st_shndx < shnum) | ||
3362 | name = f->sections[sym->st_shndx]->name; | ||
3363 | else | ||
3364 | continue; | ||
3365 | #if defined(__SH5__) | ||
3366 | /* | ||
3367 | * For sh64 it is possible that the target of a branch | ||
3368 | * requires a mode switch (32 to 16 and back again). | ||
3369 | * | ||
3370 | * This is implied by the lsb being set in the target | ||
3371 | * address for SHmedia mode and clear for SHcompact. | ||
3372 | */ | ||
3373 | val |= sym->st_other & 4; | ||
3374 | #endif | ||
3375 | obj_add_symbol(f, name, j, sym->st_info, sym->st_shndx, | ||
3376 | val, sym->st_size); | ||
3377 | } | ||
3378 | } | ||
3379 | break; | ||
3380 | |||
3381 | case SHT_RELM: | ||
3382 | if (sec->header.sh_entsize != sizeof(ElfW(RelM))) { | ||
3383 | bb_error_msg_and_die("relocation entry size mismatch: %lu != %lu", | ||
3384 | (unsigned long) sec->header.sh_entsize, | ||
3385 | (unsigned long) sizeof(ElfW(RelM))); | ||
3386 | } | ||
3387 | break; | ||
3388 | /* XXX Relocation code from modutils-2.3.19 is not here. | ||
3389 | * Why? That's about 20 lines of code from obj/obj_load.c, | ||
3390 | * which gets done in a second pass through the sections. | ||
3391 | * This BusyBox insmod does similar work in obj_relocate(). */ | ||
3392 | } | ||
3393 | } | ||
3394 | |||
3395 | return f; | ||
3396 | } | ||
3397 | |||
3398 | #if ENABLE_FEATURE_INSMOD_LOADINKMEM | ||
3399 | /* | ||
3400 | * load the unloaded sections directly into the memory allocated by | ||
3401 | * kernel for the module | ||
3402 | */ | ||
3403 | |||
3404 | niro | 984 | static int obj_load_progbits(char *image, size_t image_size, struct obj_file *f, char *imagebase) |
3405 | niro | 816 | { |
3406 | ElfW(Addr) base = f->baseaddr; | ||
3407 | struct obj_section* sec; | ||
3408 | |||
3409 | for (sec = f->load_order; sec; sec = sec->load_next) { | ||
3410 | /* section already loaded? */ | ||
3411 | if (sec->contents != NULL) | ||
3412 | continue; | ||
3413 | if (sec->header.sh_size == 0) | ||
3414 | continue; | ||
3415 | sec->contents = imagebase + (sec->header.sh_addr - base); | ||
3416 | niro | 984 | if (image_size < (sec->header.sh_offset + sec->header.sh_size)) { |
3417 | bb_error_msg("error reading ELF section data"); | ||
3418 | return 0; /* need to delete half-loaded module! */ | ||
3419 | niro | 816 | } |
3420 | niro | 984 | memcpy(sec->contents, image + sec->header.sh_offset, sec->header.sh_size); |
3421 | niro | 816 | } |
3422 | return 1; | ||
3423 | } | ||
3424 | #endif | ||
3425 | |||
3426 | static void hide_special_symbols(struct obj_file *f) | ||
3427 | { | ||
3428 | static const char *const specials[] = { | ||
3429 | SPFX "cleanup_module", | ||
3430 | SPFX "init_module", | ||
3431 | SPFX "kernel_version", | ||
3432 | NULL | ||
3433 | }; | ||
3434 | |||
3435 | struct obj_symbol *sym; | ||
3436 | const char *const *p; | ||
3437 | |||
3438 | for (p = specials; *p; ++p) { | ||
3439 | sym = obj_find_symbol(f, *p); | ||
3440 | if (sym != NULL) | ||
3441 | sym->info = ELF_ST_INFO(STB_LOCAL, ELF_ST_TYPE(sym->info)); | ||
3442 | } | ||
3443 | } | ||
3444 | |||
3445 | |||
3446 | #if ENABLE_FEATURE_CHECK_TAINTED_MODULE | ||
3447 | static int obj_gpl_license(struct obj_file *f, const char **license) | ||
3448 | { | ||
3449 | struct obj_section *sec; | ||
3450 | /* This list must match *exactly* the list of allowable licenses in | ||
3451 | * linux/include/linux/module.h. Checking for leading "GPL" will not | ||
3452 | * work, somebody will use "GPL sucks, this is proprietary". | ||
3453 | */ | ||
3454 | static const char *const gpl_licenses[] = { | ||
3455 | "GPL", | ||
3456 | "GPL v2", | ||
3457 | "GPL and additional rights", | ||
3458 | "Dual BSD/GPL", | ||
3459 | "Dual MPL/GPL" | ||
3460 | }; | ||
3461 | |||
3462 | sec = obj_find_section(f, ".modinfo"); | ||
3463 | if (sec) { | ||
3464 | const char *value, *ptr, *endptr; | ||
3465 | ptr = sec->contents; | ||
3466 | endptr = ptr + sec->header.sh_size; | ||
3467 | while (ptr < endptr) { | ||
3468 | value = strchr(ptr, '='); | ||
3469 | if (value && strncmp(ptr, "license", value-ptr) == 0) { | ||
3470 | unsigned i; | ||
3471 | if (license) | ||
3472 | *license = value+1; | ||
3473 | for (i = 0; i < ARRAY_SIZE(gpl_licenses); ++i) { | ||
3474 | if (strcmp(value+1, gpl_licenses[i]) == 0) | ||
3475 | return 0; | ||
3476 | } | ||
3477 | return 2; | ||
3478 | } | ||
3479 | ptr = strchr(ptr, '\0'); | ||
3480 | if (ptr) | ||
3481 | ptr++; | ||
3482 | else | ||
3483 | ptr = endptr; | ||
3484 | } | ||
3485 | } | ||
3486 | return 1; | ||
3487 | } | ||
3488 | |||
3489 | #define TAINT_FILENAME "/proc/sys/kernel/tainted" | ||
3490 | #define TAINT_PROPRIETORY_MODULE (1 << 0) | ||
3491 | #define TAINT_FORCED_MODULE (1 << 1) | ||
3492 | #define TAINT_UNSAFE_SMP (1 << 2) | ||
3493 | #define TAINT_URL "http://www.tux.org/lkml/#export-tainted" | ||
3494 | |||
3495 | static void set_tainted(int fd, const char *m_name, | ||
3496 | niro | 984 | int kernel_has_tainted, int taint, |
3497 | const char *text1, const char *text2) | ||
3498 | niro | 816 | { |
3499 | static smallint printed_info; | ||
3500 | |||
3501 | char buf[80]; | ||
3502 | int oldval; | ||
3503 | |||
3504 | if (fd < 0 && !kernel_has_tainted) | ||
3505 | return; /* New modutils on old kernel */ | ||
3506 | printf("Warning: loading %s will taint the kernel: %s%s\n", | ||
3507 | m_name, text1, text2); | ||
3508 | if (!printed_info) { | ||
3509 | printf(" See %s for information about tainted modules\n", TAINT_URL); | ||
3510 | printed_info = 1; | ||
3511 | } | ||
3512 | if (fd >= 0) { | ||
3513 | read(fd, buf, sizeof(buf)-1); | ||
3514 | buf[sizeof(buf)-1] = '\0'; | ||
3515 | oldval = strtoul(buf, NULL, 10); | ||
3516 | sprintf(buf, "%d\n", oldval | taint); | ||
3517 | niro | 984 | xwrite_str(fd, buf); |
3518 | niro | 816 | } |
3519 | } | ||
3520 | |||
3521 | /* Check if loading this module will taint the kernel. */ | ||
3522 | static void check_tainted_module(struct obj_file *f, const char *m_name) | ||
3523 | { | ||
3524 | static const char tainted_file[] ALIGN1 = TAINT_FILENAME; | ||
3525 | |||
3526 | int fd, kernel_has_tainted; | ||
3527 | const char *ptr; | ||
3528 | |||
3529 | kernel_has_tainted = 1; | ||
3530 | fd = open(tainted_file, O_RDWR); | ||
3531 | if (fd < 0) { | ||
3532 | if (errno == ENOENT) | ||
3533 | kernel_has_tainted = 0; | ||
3534 | else if (errno == EACCES) | ||
3535 | kernel_has_tainted = 1; | ||
3536 | else { | ||
3537 | perror(tainted_file); | ||
3538 | kernel_has_tainted = 0; | ||
3539 | } | ||
3540 | } | ||
3541 | |||
3542 | switch (obj_gpl_license(f, &ptr)) { | ||
3543 | case 0: | ||
3544 | break; | ||
3545 | case 1: | ||
3546 | set_tainted(fd, m_name, kernel_has_tainted, TAINT_PROPRIETORY_MODULE, "no license", ""); | ||
3547 | break; | ||
3548 | niro | 984 | default: /* case 2: */ |
3549 | niro | 816 | /* The module has a non-GPL license so we pretend that the |
3550 | * kernel always has a taint flag to get a warning even on | ||
3551 | * kernels without the proc flag. | ||
3552 | */ | ||
3553 | set_tainted(fd, m_name, 1, TAINT_PROPRIETORY_MODULE, "non-GPL license - ", ptr); | ||
3554 | break; | ||
3555 | } | ||
3556 | |||
3557 | if (flag_force_load) | ||
3558 | set_tainted(fd, m_name, 1, TAINT_FORCED_MODULE, "forced load", ""); | ||
3559 | |||
3560 | if (fd >= 0) | ||
3561 | close(fd); | ||
3562 | } | ||
3563 | niro | 984 | #else /* !FEATURE_CHECK_TAINTED_MODULE */ |
3564 | niro | 816 | #define check_tainted_module(x, y) do { } while (0); |
3565 | niro | 984 | #endif |
3566 | niro | 816 | |
3567 | #if ENABLE_FEATURE_INSMOD_KSYMOOPS_SYMBOLS | ||
3568 | /* add module source, timestamp, kernel version and a symbol for the | ||
3569 | * start of some sections. this info is used by ksymoops to do better | ||
3570 | * debugging. | ||
3571 | */ | ||
3572 | #if !ENABLE_FEATURE_INSMOD_VERSION_CHECKING | ||
3573 | #define get_module_version(f, str) get_module_version(str) | ||
3574 | #endif | ||
3575 | static int | ||
3576 | get_module_version(struct obj_file *f, char str[STRVERSIONLEN]) | ||
3577 | { | ||
3578 | #if ENABLE_FEATURE_INSMOD_VERSION_CHECKING | ||
3579 | return new_get_module_version(f, str); | ||
3580 | niro | 984 | #else |
3581 | niro | 816 | strncpy(str, "???", sizeof(str)); |
3582 | return -1; | ||
3583 | niro | 984 | #endif |
3584 | niro | 816 | } |
3585 | |||
3586 | /* add module source, timestamp, kernel version and a symbol for the | ||
3587 | * start of some sections. this info is used by ksymoops to do better | ||
3588 | * debugging. | ||
3589 | */ | ||
3590 | static void | ||
3591 | add_ksymoops_symbols(struct obj_file *f, const char *filename, | ||
3592 | niro | 984 | const char *m_name) |
3593 | niro | 816 | { |
3594 | static const char symprefix[] ALIGN1 = "__insmod_"; | ||
3595 | static const char section_names[][8] = { | ||
3596 | ".text", | ||
3597 | ".rodata", | ||
3598 | ".data", | ||
3599 | ".bss", | ||
3600 | ".sbss" | ||
3601 | }; | ||
3602 | |||
3603 | struct obj_section *sec; | ||
3604 | struct obj_symbol *sym; | ||
3605 | char *name, *absolute_filename; | ||
3606 | char str[STRVERSIONLEN]; | ||
3607 | unsigned i; | ||
3608 | niro | 984 | int lm_name, lfilename, use_ksymtab, version; |
3609 | niro | 816 | struct stat statbuf; |
3610 | |||
3611 | /* WARNING: was using realpath, but replaced by readlink to stop using | ||
3612 | * lots of stack. But here it seems to be able to cause problems? */ | ||
3613 | absolute_filename = xmalloc_readlink(filename); | ||
3614 | if (!absolute_filename) | ||
3615 | absolute_filename = xstrdup(filename); | ||
3616 | |||
3617 | lm_name = strlen(m_name); | ||
3618 | lfilename = strlen(absolute_filename); | ||
3619 | |||
3620 | /* add to ksymtab if it already exists or there is no ksymtab and other symbols | ||
3621 | * are not to be exported. otherwise leave ksymtab alone for now, the | ||
3622 | * "export all symbols" compatibility code will export these symbols later. | ||
3623 | */ | ||
3624 | use_ksymtab = obj_find_section(f, "__ksymtab") || flag_noexport; | ||
3625 | |||
3626 | sec = obj_find_section(f, ".this"); | ||
3627 | if (sec) { | ||
3628 | /* tag the module header with the object name, last modified | ||
3629 | * timestamp and module version. worst case for module version | ||
3630 | * is 0xffffff, decimal 16777215. putting all three fields in | ||
3631 | * one symbol is less readable but saves kernel space. | ||
3632 | */ | ||
3633 | if (stat(absolute_filename, &statbuf) != 0) | ||
3634 | statbuf.st_mtime = 0; | ||
3635 | version = get_module_version(f, str); /* -1 if not found */ | ||
3636 | niro | 984 | name = xasprintf("%s%s_O%s_M%0*lX_V%d", |
3637 | niro | 816 | symprefix, m_name, absolute_filename, |
3638 | niro | 984 | (int)(2 * sizeof(statbuf.st_mtime)), |
3639 | (long)statbuf.st_mtime, | ||
3640 | niro | 816 | version); |
3641 | sym = obj_add_symbol(f, name, -1, | ||
3642 | ELF_ST_INFO(STB_GLOBAL, STT_NOTYPE), | ||
3643 | sec->idx, sec->header.sh_addr, 0); | ||
3644 | if (use_ksymtab) | ||
3645 | new_add_ksymtab(f, sym); | ||
3646 | } | ||
3647 | free(absolute_filename); | ||
3648 | #ifdef _NOT_SUPPORTED_ | ||
3649 | /* record where the persistent data is going, same address as previous symbol */ | ||
3650 | if (f->persist) { | ||
3651 | niro | 984 | name = xasprintf("%s%s_P%s", |
3652 | niro | 816 | symprefix, m_name, f->persist); |
3653 | sym = obj_add_symbol(f, name, -1, ELF_ST_INFO(STB_GLOBAL, STT_NOTYPE), | ||
3654 | sec->idx, sec->header.sh_addr, 0); | ||
3655 | if (use_ksymtab) | ||
3656 | new_add_ksymtab(f, sym); | ||
3657 | } | ||
3658 | niro | 984 | #endif |
3659 | niro | 816 | /* tag the desired sections if size is non-zero */ |
3660 | for (i = 0; i < ARRAY_SIZE(section_names); ++i) { | ||
3661 | sec = obj_find_section(f, section_names[i]); | ||
3662 | if (sec && sec->header.sh_size) { | ||
3663 | niro | 984 | name = xasprintf("%s%s_S%s_L%ld", |
3664 | niro | 816 | symprefix, m_name, sec->name, |
3665 | (long)sec->header.sh_size); | ||
3666 | sym = obj_add_symbol(f, name, -1, ELF_ST_INFO(STB_GLOBAL, STT_NOTYPE), | ||
3667 | sec->idx, sec->header.sh_addr, 0); | ||
3668 | if (use_ksymtab) | ||
3669 | new_add_ksymtab(f, sym); | ||
3670 | } | ||
3671 | } | ||
3672 | } | ||
3673 | #endif /* FEATURE_INSMOD_KSYMOOPS_SYMBOLS */ | ||
3674 | |||
3675 | #if ENABLE_FEATURE_INSMOD_LOAD_MAP | ||
3676 | static void print_load_map(struct obj_file *f) | ||
3677 | { | ||
3678 | struct obj_section *sec; | ||
3679 | #if ENABLE_FEATURE_INSMOD_LOAD_MAP_FULL | ||
3680 | struct obj_symbol **all, **p; | ||
3681 | niro | 984 | int i, nsyms; |
3682 | char *loaded; /* array of booleans */ | ||
3683 | niro | 816 | struct obj_symbol *sym; |
3684 | #endif | ||
3685 | /* Report on the section layout. */ | ||
3686 | printf("Sections: Size %-*s Align\n", | ||
3687 | (int) (2 * sizeof(void *)), "Address"); | ||
3688 | |||
3689 | for (sec = f->load_order; sec; sec = sec->load_next) { | ||
3690 | int a; | ||
3691 | unsigned long tmp; | ||
3692 | |||
3693 | for (a = -1, tmp = sec->header.sh_addralign; tmp; ++a) | ||
3694 | tmp >>= 1; | ||
3695 | if (a == -1) | ||
3696 | a = 0; | ||
3697 | |||
3698 | printf("%-15s %08lx %0*lx 2**%d\n", | ||
3699 | sec->name, | ||
3700 | (long)sec->header.sh_size, | ||
3701 | (int) (2 * sizeof(void *)), | ||
3702 | (long)sec->header.sh_addr, | ||
3703 | a); | ||
3704 | } | ||
3705 | #if ENABLE_FEATURE_INSMOD_LOAD_MAP_FULL | ||
3706 | /* Quick reference which section indices are loaded. */ | ||
3707 | i = f->header.e_shnum; | ||
3708 | niro | 984 | loaded = alloca(i * sizeof(loaded[0])); |
3709 | niro | 816 | while (--i >= 0) |
3710 | loaded[i] = ((f->sections[i]->header.sh_flags & SHF_ALLOC) != 0); | ||
3711 | |||
3712 | /* Collect the symbols we'll be listing. */ | ||
3713 | for (nsyms = i = 0; i < HASH_BUCKETS; ++i) | ||
3714 | for (sym = f->symtab[i]; sym; sym = sym->next) | ||
3715 | if (sym->secidx <= SHN_HIRESERVE | ||
3716 | niro | 984 | && (sym->secidx >= SHN_LORESERVE || loaded[sym->secidx]) |
3717 | ) { | ||
3718 | niro | 816 | ++nsyms; |
3719 | niro | 984 | } |
3720 | niro | 816 | |
3721 | niro | 984 | all = alloca(nsyms * sizeof(all[0])); |
3722 | niro | 816 | |
3723 | for (i = 0, p = all; i < HASH_BUCKETS; ++i) | ||
3724 | for (sym = f->symtab[i]; sym; sym = sym->next) | ||
3725 | if (sym->secidx <= SHN_HIRESERVE | ||
3726 | niro | 984 | && (sym->secidx >= SHN_LORESERVE || loaded[sym->secidx]) |
3727 | ) { | ||
3728 | niro | 816 | *p++ = sym; |
3729 | niro | 984 | } |
3730 | niro | 816 | |
3731 | /* And list them. */ | ||
3732 | printf("\nSymbols:\n"); | ||
3733 | for (p = all; p < all + nsyms; ++p) { | ||
3734 | char type = '?'; | ||
3735 | unsigned long value; | ||
3736 | |||
3737 | sym = *p; | ||
3738 | if (sym->secidx == SHN_ABS) { | ||
3739 | type = 'A'; | ||
3740 | value = sym->value; | ||
3741 | } else if (sym->secidx == SHN_UNDEF) { | ||
3742 | type = 'U'; | ||
3743 | value = 0; | ||
3744 | } else { | ||
3745 | sec = f->sections[sym->secidx]; | ||
3746 | |||
3747 | if (sec->header.sh_type == SHT_NOBITS) | ||
3748 | type = 'B'; | ||
3749 | else if (sec->header.sh_flags & SHF_ALLOC) { | ||
3750 | if (sec->header.sh_flags & SHF_EXECINSTR) | ||
3751 | type = 'T'; | ||
3752 | else if (sec->header.sh_flags & SHF_WRITE) | ||
3753 | type = 'D'; | ||
3754 | else | ||
3755 | type = 'R'; | ||
3756 | } | ||
3757 | value = sym->value + sec->header.sh_addr; | ||
3758 | } | ||
3759 | |||
3760 | if (ELF_ST_BIND(sym->info) == STB_LOCAL) | ||
3761 | niro | 984 | type |= 0x20; /* tolower. safe for '?' too */ |
3762 | niro | 816 | |
3763 | printf("%0*lx %c %s\n", (int) (2 * sizeof(void *)), value, | ||
3764 | type, sym->name); | ||
3765 | } | ||
3766 | #endif | ||
3767 | } | ||
3768 | #else /* !FEATURE_INSMOD_LOAD_MAP */ | ||
3769 | static void print_load_map(struct obj_file *f UNUSED_PARAM) | ||
3770 | { | ||
3771 | } | ||
3772 | #endif | ||
3773 | |||
3774 | niro | 984 | int FAST_FUNC bb_init_module_24(const char *m_filename, const char *options) |
3775 | niro | 816 | { |
3776 | int k_crcs; | ||
3777 | unsigned long m_size; | ||
3778 | ElfW(Addr) m_addr; | ||
3779 | struct obj_file *f; | ||
3780 | int exit_status = EXIT_FAILURE; | ||
3781 | char *m_name; | ||
3782 | #if ENABLE_FEATURE_INSMOD_VERSION_CHECKING | ||
3783 | niro | 984 | int m_has_modinfo; |
3784 | niro | 816 | #endif |
3785 | niro | 984 | char *image; |
3786 | size_t image_size; | ||
3787 | bool mmaped; | ||
3788 | niro | 816 | |
3789 | niro | 984 | image_size = INT_MAX - 4095; |
3790 | mmaped = 0; | ||
3791 | image = try_to_mmap_module(m_filename, &image_size); | ||
3792 | if (image) { | ||
3793 | mmaped = 1; | ||
3794 | } else { | ||
3795 | /* Load module into memory and unzip if compressed */ | ||
3796 | image = xmalloc_open_zipped_read_close(m_filename, &image_size); | ||
3797 | if (!image) | ||
3798 | return EXIT_FAILURE; | ||
3799 | } | ||
3800 | niro | 816 | |
3801 | m_name = xstrdup(bb_basename(m_filename)); | ||
3802 | niro | 984 | /* "module.o[.gz]" -> "module" */ |
3803 | *strchrnul(m_name, '.') = '\0'; | ||
3804 | niro | 816 | |
3805 | niro | 984 | f = obj_load(image, image_size, LOADBITS); |
3806 | niro | 816 | |
3807 | #if ENABLE_FEATURE_INSMOD_VERSION_CHECKING | ||
3808 | /* Version correspondence? */ | ||
3809 | niro | 984 | m_has_modinfo = (get_modinfo_value(f, "kernel_version") != NULL); |
3810 | niro | 816 | if (!flag_quiet) { |
3811 | niro | 984 | char m_strversion[STRVERSIONLEN]; |
3812 | struct utsname uts; | ||
3813 | |||
3814 | niro | 816 | if (m_has_modinfo) { |
3815 | niro | 984 | int m_version = new_get_module_version(f, m_strversion); |
3816 | niro | 816 | if (m_version == -1) { |
3817 | niro | 984 | bb_error_msg_and_die("can't find the kernel version " |
3818 | "the module was compiled for"); | ||
3819 | niro | 816 | } |
3820 | } | ||
3821 | |||
3822 | niro | 984 | uname(&uts); |
3823 | niro | 816 | if (strncmp(uts.release, m_strversion, STRVERSIONLEN) != 0) { |
3824 | bb_error_msg("%skernel-module version mismatch\n" | ||
3825 | "\t%s was compiled for kernel version %s\n" | ||
3826 | "\twhile this kernel is version %s", | ||
3827 | flag_force_load ? "warning: " : "", | ||
3828 | m_name, m_strversion, uts.release); | ||
3829 | if (!flag_force_load) | ||
3830 | goto out; | ||
3831 | } | ||
3832 | } | ||
3833 | niro | 984 | #endif |
3834 | niro | 816 | |
3835 | if (query_module(NULL, 0, NULL, 0, NULL)) | ||
3836 | niro | 984 | bb_error_msg_and_die("old (unsupported) kernel"); |
3837 | niro | 816 | new_get_kernel_symbols(); |
3838 | k_crcs = new_is_kernel_checksummed(); | ||
3839 | |||
3840 | #if ENABLE_FEATURE_INSMOD_VERSION_CHECKING | ||
3841 | niro | 984 | { |
3842 | int m_crcs = 0; | ||
3843 | if (m_has_modinfo) | ||
3844 | m_crcs = new_is_module_checksummed(f); | ||
3845 | if (m_crcs != k_crcs) | ||
3846 | obj_set_symbol_compare(f, ncv_strcmp, ncv_symbol_hash); | ||
3847 | } | ||
3848 | #endif | ||
3849 | niro | 816 | |
3850 | /* Let the module know about the kernel symbols. */ | ||
3851 | add_kernel_symbols(f); | ||
3852 | |||
3853 | /* Allocate common symbols, symbol tables, and string tables. */ | ||
3854 | new_create_this_module(f, m_name); | ||
3855 | obj_check_undefineds(f); | ||
3856 | obj_allocate_commons(f); | ||
3857 | check_tainted_module(f, m_name); | ||
3858 | |||
3859 | niro | 984 | /* Done with the module name, on to the optional var=value arguments */ |
3860 | niro | 816 | new_process_module_arguments(f, options); |
3861 | |||
3862 | arch_create_got(f); | ||
3863 | hide_special_symbols(f); | ||
3864 | |||
3865 | #if ENABLE_FEATURE_INSMOD_KSYMOOPS_SYMBOLS | ||
3866 | add_ksymoops_symbols(f, m_filename, m_name); | ||
3867 | niro | 984 | #endif |
3868 | niro | 816 | |
3869 | new_create_module_ksymtab(f); | ||
3870 | |||
3871 | /* Find current size of the module */ | ||
3872 | m_size = obj_load_size(f); | ||
3873 | |||
3874 | m_addr = create_module(m_name, m_size); | ||
3875 | if (m_addr == (ElfW(Addr))(-1)) switch (errno) { | ||
3876 | niro | 984 | case EEXIST: |
3877 | bb_error_msg_and_die("a module named %s already exists", m_name); | ||
3878 | case ENOMEM: | ||
3879 | bb_error_msg_and_die("can't allocate kernel memory for module; needed %lu bytes", | ||
3880 | m_size); | ||
3881 | default: | ||
3882 | bb_perror_msg_and_die("create_module: %s", m_name); | ||
3883 | niro | 816 | } |
3884 | |||
3885 | #if !LOADBITS | ||
3886 | /* | ||
3887 | * the PROGBITS section was not loaded by the obj_load | ||
3888 | * now we can load them directly into the kernel memory | ||
3889 | */ | ||
3890 | niro | 984 | if (!obj_load_progbits(image, image_size, f, (char*)m_addr)) { |
3891 | niro | 816 | delete_module(m_name, 0); |
3892 | goto out; | ||
3893 | } | ||
3894 | #endif | ||
3895 | |||
3896 | if (!obj_relocate(f, m_addr)) { | ||
3897 | delete_module(m_name, 0); | ||
3898 | goto out; | ||
3899 | } | ||
3900 | |||
3901 | if (!new_init_module(m_name, f, m_size)) { | ||
3902 | delete_module(m_name, 0); | ||
3903 | goto out; | ||
3904 | } | ||
3905 | |||
3906 | if (flag_print_load_map) | ||
3907 | print_load_map(f); | ||
3908 | |||
3909 | exit_status = EXIT_SUCCESS; | ||
3910 | |||
3911 | out: | ||
3912 | niro | 984 | if (mmaped) |
3913 | munmap(image, image_size); | ||
3914 | else | ||
3915 | free(image); | ||
3916 | niro | 816 | free(m_name); |
3917 | |||
3918 | return exit_status; | ||
3919 | } |