1 | /* 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 source tree.
|
---|
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 | /* NDS32 support */
|
---|
94 | #if defined(__nds32__) || defined(__NDS32__)
|
---|
95 | #define CONFIG_USE_GOT_ENTRIES
|
---|
96 | #define CONFIG_GOT_ENTRY_SIZE 4
|
---|
97 | #define CONFIG_USE_SINGLE
|
---|
98 |
|
---|
99 | #if defined(__NDS32_EB__)
|
---|
100 | #define MATCH_MACHINE(x) (x == EM_NDS32)
|
---|
101 | #define SHT_RELM SHT_RELA
|
---|
102 | #define Elf32_RelM Elf32_Rela
|
---|
103 | #define ELFCLASSM ELFCLASS32
|
---|
104 | #endif
|
---|
105 |
|
---|
106 | #if defined(__NDS32_EL__)
|
---|
107 | #define MATCH_MACHINE(x) (x == EM_NDS32)
|
---|
108 | #define SHT_RELM SHT_RELA
|
---|
109 | #define Elf32_RelM Elf32_Rela
|
---|
110 | #define ELFCLASSM ELFCLASS32
|
---|
111 | #endif
|
---|
112 | #endif
|
---|
113 |
|
---|
114 | /* blackfin */
|
---|
115 | #if defined(BFIN)
|
---|
116 | #define MATCH_MACHINE(x) (x == EM_BLACKFIN)
|
---|
117 | #define SHT_RELM SHT_RELA
|
---|
118 | #define Elf32_RelM Elf32_Rela
|
---|
119 | #define ELFCLASSM ELFCLASS32
|
---|
120 | #endif
|
---|
121 |
|
---|
122 | /* CRIS */
|
---|
123 | #if defined(__cris__)
|
---|
124 | #define MATCH_MACHINE(x) (x == EM_CRIS)
|
---|
125 | #define SHT_RELM SHT_RELA
|
---|
126 | #define Elf32_RelM Elf32_Rela
|
---|
127 | #define ELFCLASSM ELFCLASS32
|
---|
128 | #ifndef EM_CRIS
|
---|
129 | #define EM_CRIS 76
|
---|
130 | #define R_CRIS_NONE 0
|
---|
131 | #define R_CRIS_32 3
|
---|
132 | #endif
|
---|
133 | #endif
|
---|
134 |
|
---|
135 | /* H8/300 */
|
---|
136 | #if defined(__H8300H__) || defined(__H8300S__)
|
---|
137 | #define MATCH_MACHINE(x) (x == EM_H8_300)
|
---|
138 | #define SHT_RELM SHT_RELA
|
---|
139 | #define Elf32_RelM Elf32_Rela
|
---|
140 | #define ELFCLASSM ELFCLASS32
|
---|
141 | #define USE_SINGLE
|
---|
142 | #define SYMBOL_PREFIX "_"
|
---|
143 | #endif
|
---|
144 |
|
---|
145 | /* PA-RISC / HP-PA */
|
---|
146 | #if defined(__hppa__)
|
---|
147 | #define MATCH_MACHINE(x) (x == EM_PARISC)
|
---|
148 | #define SHT_RELM SHT_RELA
|
---|
149 | #if defined(__LP64__)
|
---|
150 | #define Elf64_RelM Elf64_Rela
|
---|
151 | #define ELFCLASSM ELFCLASS64
|
---|
152 | #else
|
---|
153 | #define Elf32_RelM Elf32_Rela
|
---|
154 | #define ELFCLASSM ELFCLASS32
|
---|
155 | #endif
|
---|
156 | #endif
|
---|
157 |
|
---|
158 | /* x86 */
|
---|
159 | #if defined(__i386__)
|
---|
160 | #ifndef EM_486
|
---|
161 | #define MATCH_MACHINE(x) (x == EM_386)
|
---|
162 | #else
|
---|
163 | #define MATCH_MACHINE(x) (x == EM_386 || x == EM_486)
|
---|
164 | #endif
|
---|
165 | #define SHT_RELM SHT_REL
|
---|
166 | #define Elf32_RelM Elf32_Rel
|
---|
167 | #define ELFCLASSM ELFCLASS32
|
---|
168 | #define USE_GOT_ENTRIES
|
---|
169 | #define GOT_ENTRY_SIZE 4
|
---|
170 | #define USE_SINGLE
|
---|
171 | #endif
|
---|
172 |
|
---|
173 | /* IA64, aka Itanium */
|
---|
174 | #if defined(__ia64__)
|
---|
175 | #define MATCH_MACHINE(x) (x == EM_IA_64)
|
---|
176 | #define SHT_RELM SHT_RELA
|
---|
177 | #define Elf64_RelM Elf64_Rela
|
---|
178 | #define ELFCLASSM ELFCLASS64
|
---|
179 | #endif
|
---|
180 |
|
---|
181 | /* m68k */
|
---|
182 | #if defined(__mc68000__)
|
---|
183 | #define MATCH_MACHINE(x) (x == EM_68K)
|
---|
184 | #define SHT_RELM SHT_RELA
|
---|
185 | #define Elf32_RelM Elf32_Rela
|
---|
186 | #define ELFCLASSM ELFCLASS32
|
---|
187 | #define USE_GOT_ENTRIES
|
---|
188 | #define GOT_ENTRY_SIZE 4
|
---|
189 | #define USE_SINGLE
|
---|
190 | #endif
|
---|
191 |
|
---|
192 | /* Microblaze */
|
---|
193 | #if defined(__microblaze__)
|
---|
194 | #define USE_SINGLE
|
---|
195 | #include <linux/elf-em.h>
|
---|
196 | #define MATCH_MACHINE(x) (x == EM_XILINX_MICROBLAZE)
|
---|
197 | #define SHT_RELM SHT_RELA
|
---|
198 | #define Elf32_RelM Elf32_Rela
|
---|
199 | #define ELFCLASSM ELFCLASS32
|
---|
200 | #endif
|
---|
201 |
|
---|
202 | /* MIPS */
|
---|
203 | #if defined(__mips__)
|
---|
204 | #define MATCH_MACHINE(x) (x == EM_MIPS || x == EM_MIPS_RS3_LE)
|
---|
205 | #define SHT_RELM SHT_REL
|
---|
206 | #define Elf32_RelM Elf32_Rel
|
---|
207 | #define ELFCLASSM ELFCLASS32
|
---|
208 | /* Account for ELF spec changes. */
|
---|
209 | #ifndef EM_MIPS_RS3_LE
|
---|
210 | #ifdef EM_MIPS_RS4_BE
|
---|
211 | #define EM_MIPS_RS3_LE EM_MIPS_RS4_BE
|
---|
212 | #else
|
---|
213 | #define EM_MIPS_RS3_LE 10
|
---|
214 | #endif
|
---|
215 | #endif /* !EM_MIPS_RS3_LE */
|
---|
216 | #define ARCHDATAM "__dbe_table"
|
---|
217 | #endif
|
---|
218 |
|
---|
219 | /* Nios II */
|
---|
220 | #if defined(__nios2__)
|
---|
221 | #define MATCH_MACHINE(x) (x == EM_ALTERA_NIOS2)
|
---|
222 | #define SHT_RELM SHT_RELA
|
---|
223 | #define Elf32_RelM Elf32_Rela
|
---|
224 | #define ELFCLASSM ELFCLASS32
|
---|
225 | #endif
|
---|
226 |
|
---|
227 | /* PowerPC */
|
---|
228 | #if defined(__powerpc64__)
|
---|
229 | #define MATCH_MACHINE(x) (x == EM_PPC64)
|
---|
230 | #define SHT_RELM SHT_RELA
|
---|
231 | #define Elf64_RelM Elf64_Rela
|
---|
232 | #define ELFCLASSM ELFCLASS64
|
---|
233 | #elif defined(__powerpc__)
|
---|
234 | #define MATCH_MACHINE(x) (x == EM_PPC)
|
---|
235 | #define SHT_RELM SHT_RELA
|
---|
236 | #define Elf32_RelM Elf32_Rela
|
---|
237 | #define ELFCLASSM ELFCLASS32
|
---|
238 | #define USE_PLT_ENTRIES
|
---|
239 | #define PLT_ENTRY_SIZE 16
|
---|
240 | #define USE_PLT_LIST
|
---|
241 | #define LIST_ARCHTYPE ElfW(Addr)
|
---|
242 | #define USE_LIST
|
---|
243 | #define ARCHDATAM "__ftr_fixup"
|
---|
244 | #endif
|
---|
245 |
|
---|
246 | /* S390 */
|
---|
247 | #if defined(__s390__)
|
---|
248 | #define MATCH_MACHINE(x) (x == EM_S390)
|
---|
249 | #define SHT_RELM SHT_RELA
|
---|
250 | #define Elf32_RelM Elf32_Rela
|
---|
251 | #define ELFCLASSM ELFCLASS32
|
---|
252 | #define USE_PLT_ENTRIES
|
---|
253 | #define PLT_ENTRY_SIZE 8
|
---|
254 | #define USE_GOT_ENTRIES
|
---|
255 | #define GOT_ENTRY_SIZE 8
|
---|
256 | #define USE_SINGLE
|
---|
257 | #endif
|
---|
258 |
|
---|
259 | /* SuperH */
|
---|
260 | #if defined(__sh__)
|
---|
261 | #define MATCH_MACHINE(x) (x == EM_SH)
|
---|
262 | #define SHT_RELM SHT_RELA
|
---|
263 | #define Elf32_RelM Elf32_Rela
|
---|
264 | #define ELFCLASSM ELFCLASS32
|
---|
265 | #define USE_GOT_ENTRIES
|
---|
266 | #define GOT_ENTRY_SIZE 4
|
---|
267 | #define USE_SINGLE
|
---|
268 | /* the SH changes have only been tested in =little endian= mode */
|
---|
269 | /* I'm not sure about big endian, so let's warn: */
|
---|
270 | #if defined(__sh__) && BB_BIG_ENDIAN
|
---|
271 | # error insmod.c may require changes for use on big endian SH
|
---|
272 | #endif
|
---|
273 | /* it may or may not work on the SH1/SH2... Error on those also */
|
---|
274 | #if ((!(defined(__SH3__) || defined(__SH4__) || defined(__SH5__)))) && (defined(__sh__))
|
---|
275 | #error insmod.c may require changes for SH1 or SH2 use
|
---|
276 | #endif
|
---|
277 | #endif
|
---|
278 |
|
---|
279 | /* Sparc */
|
---|
280 | #if defined(__sparc__)
|
---|
281 | #define MATCH_MACHINE(x) (x == EM_SPARC)
|
---|
282 | #define SHT_RELM SHT_RELA
|
---|
283 | #define Elf32_RelM Elf32_Rela
|
---|
284 | #define ELFCLASSM ELFCLASS32
|
---|
285 | #endif
|
---|
286 |
|
---|
287 | /* v850e */
|
---|
288 | #if defined(__v850e__)
|
---|
289 | #define MATCH_MACHINE(x) ((x) == EM_V850 || (x) == EM_CYGNUS_V850)
|
---|
290 | #define SHT_RELM SHT_RELA
|
---|
291 | #define Elf32_RelM Elf32_Rela
|
---|
292 | #define ELFCLASSM ELFCLASS32
|
---|
293 | #define USE_PLT_ENTRIES
|
---|
294 | #define PLT_ENTRY_SIZE 8
|
---|
295 | #define USE_SINGLE
|
---|
296 | #ifndef EM_CYGNUS_V850 /* grumble */
|
---|
297 | #define EM_CYGNUS_V850 0x9080
|
---|
298 | #endif
|
---|
299 | #define SYMBOL_PREFIX "_"
|
---|
300 | #endif
|
---|
301 |
|
---|
302 | /* X86_64 */
|
---|
303 | #if defined(__x86_64__)
|
---|
304 | #define MATCH_MACHINE(x) (x == EM_X86_64)
|
---|
305 | #define SHT_RELM SHT_RELA
|
---|
306 | #define USE_GOT_ENTRIES
|
---|
307 | #define GOT_ENTRY_SIZE 8
|
---|
308 | #define USE_SINGLE
|
---|
309 | #define Elf64_RelM Elf64_Rela
|
---|
310 | #define ELFCLASSM ELFCLASS64
|
---|
311 | #endif
|
---|
312 |
|
---|
313 | #ifndef SHT_RELM
|
---|
314 | #error Sorry, but insmod.c does not yet support this architecture...
|
---|
315 | #endif
|
---|
316 |
|
---|
317 |
|
---|
318 | //----------------------------------------------------------------------------
|
---|
319 | //--------modutils module.h, lines 45-242
|
---|
320 | //----------------------------------------------------------------------------
|
---|
321 |
|
---|
322 | /* Definitions for the Linux module syscall interface.
|
---|
323 | Copyright 1996, 1997 Linux International.
|
---|
324 |
|
---|
325 | Contributed by Richard Henderson <rth@tamu.edu>
|
---|
326 |
|
---|
327 | This file is part of the Linux modutils.
|
---|
328 |
|
---|
329 | This program is free software; you can redistribute it and/or modify it
|
---|
330 | under the terms of the GNU General Public License as published by the
|
---|
331 | Free Software Foundation; either version 2 of the License, or (at your
|
---|
332 | option) any later version.
|
---|
333 |
|
---|
334 | This program is distributed in the hope that it will be useful, but
|
---|
335 | WITHOUT ANY WARRANTY; without even the implied warranty of
|
---|
336 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
---|
337 | General Public License for more details.
|
---|
338 |
|
---|
339 | You should have received a copy of the GNU General Public License
|
---|
340 | along with this program; if not, write to the Free Software Foundation,
|
---|
341 | Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
|
---|
342 |
|
---|
343 |
|
---|
344 | #ifndef MODUTILS_MODULE_H
|
---|
345 |
|
---|
346 | /*======================================================================*/
|
---|
347 | /* For sizeof() which are related to the module platform and not to the
|
---|
348 | environment isnmod is running in, use sizeof_xx instead of sizeof(xx). */
|
---|
349 |
|
---|
350 | #define tgt_sizeof_char sizeof(char)
|
---|
351 | #define tgt_sizeof_short sizeof(short)
|
---|
352 | #define tgt_sizeof_int sizeof(int)
|
---|
353 | #define tgt_sizeof_long sizeof(long)
|
---|
354 | #define tgt_sizeof_char_p sizeof(char *)
|
---|
355 | #define tgt_sizeof_void_p sizeof(void *)
|
---|
356 | #define tgt_long long
|
---|
357 |
|
---|
358 | #if defined(__sparc__) && !defined(__sparc_v9__) && defined(ARCH_sparc64)
|
---|
359 | #undef tgt_sizeof_long
|
---|
360 | #undef tgt_sizeof_char_p
|
---|
361 | #undef tgt_sizeof_void_p
|
---|
362 | #undef tgt_long
|
---|
363 | enum {
|
---|
364 | tgt_sizeof_long = 8,
|
---|
365 | tgt_sizeof_char_p = 8,
|
---|
366 | tgt_sizeof_void_p = 8
|
---|
367 | };
|
---|
368 | #define tgt_long long long
|
---|
369 | #endif
|
---|
370 |
|
---|
371 | /*======================================================================*/
|
---|
372 | /* The structures used in Linux 2.1. */
|
---|
373 |
|
---|
374 | /* Note: new_module_symbol does not use tgt_long intentionally */
|
---|
375 | struct new_module_symbol {
|
---|
376 | unsigned long value;
|
---|
377 | unsigned long name;
|
---|
378 | };
|
---|
379 |
|
---|
380 | struct new_module_persist;
|
---|
381 |
|
---|
382 | struct new_module_ref {
|
---|
383 | unsigned tgt_long dep; /* kernel addresses */
|
---|
384 | unsigned tgt_long ref;
|
---|
385 | unsigned tgt_long next_ref;
|
---|
386 | };
|
---|
387 |
|
---|
388 | struct new_module {
|
---|
389 | unsigned tgt_long size_of_struct; /* == sizeof(module) */
|
---|
390 | unsigned tgt_long next;
|
---|
391 | unsigned tgt_long name;
|
---|
392 | unsigned tgt_long size;
|
---|
393 |
|
---|
394 | tgt_long usecount;
|
---|
395 | unsigned tgt_long flags; /* AUTOCLEAN et al */
|
---|
396 |
|
---|
397 | unsigned nsyms;
|
---|
398 | unsigned ndeps;
|
---|
399 |
|
---|
400 | unsigned tgt_long syms;
|
---|
401 | unsigned tgt_long deps;
|
---|
402 | unsigned tgt_long refs;
|
---|
403 | unsigned tgt_long init;
|
---|
404 | unsigned tgt_long cleanup;
|
---|
405 | unsigned tgt_long ex_table_start;
|
---|
406 | unsigned tgt_long ex_table_end;
|
---|
407 | #ifdef __alpha__
|
---|
408 | unsigned tgt_long gp;
|
---|
409 | #endif
|
---|
410 | /* Everything after here is extension. */
|
---|
411 | unsigned tgt_long persist_start;
|
---|
412 | unsigned tgt_long persist_end;
|
---|
413 | unsigned tgt_long can_unload;
|
---|
414 | unsigned tgt_long runsize;
|
---|
415 | const char *kallsyms_start; /* All symbols for kernel debugging */
|
---|
416 | const char *kallsyms_end;
|
---|
417 | const char *archdata_start; /* arch specific data for module */
|
---|
418 | const char *archdata_end;
|
---|
419 | const char *kernel_data; /* Reserved for kernel internal use */
|
---|
420 | };
|
---|
421 |
|
---|
422 | #ifdef ARCHDATAM
|
---|
423 | #define ARCHDATA_SEC_NAME ARCHDATAM
|
---|
424 | #else
|
---|
425 | #define ARCHDATA_SEC_NAME "__archdata"
|
---|
426 | #endif
|
---|
427 | #define KALLSYMS_SEC_NAME "__kallsyms"
|
---|
428 |
|
---|
429 |
|
---|
430 | struct new_module_info {
|
---|
431 | unsigned long addr;
|
---|
432 | unsigned long size;
|
---|
433 | unsigned long flags;
|
---|
434 | long usecount;
|
---|
435 | };
|
---|
436 |
|
---|
437 | /* Bits of module.flags. */
|
---|
438 | enum {
|
---|
439 | NEW_MOD_RUNNING = 1,
|
---|
440 | NEW_MOD_DELETED = 2,
|
---|
441 | NEW_MOD_AUTOCLEAN = 4,
|
---|
442 | NEW_MOD_VISITED = 8,
|
---|
443 | NEW_MOD_USED_ONCE = 16
|
---|
444 | };
|
---|
445 |
|
---|
446 | int init_module(const char *name, const struct new_module *);
|
---|
447 | int query_module(const char *name, int which, void *buf,
|
---|
448 | size_t bufsize, size_t *ret);
|
---|
449 |
|
---|
450 | /* Values for query_module's which. */
|
---|
451 | enum {
|
---|
452 | QM_MODULES = 1,
|
---|
453 | QM_DEPS = 2,
|
---|
454 | QM_REFS = 3,
|
---|
455 | QM_SYMBOLS = 4,
|
---|
456 | QM_INFO = 5
|
---|
457 | };
|
---|
458 |
|
---|
459 | /*======================================================================*/
|
---|
460 | /* The system calls unchanged between 2.0 and 2.1. */
|
---|
461 |
|
---|
462 | unsigned long create_module(const char *, size_t);
|
---|
463 | int delete_module(const char *module, unsigned int flags);
|
---|
464 |
|
---|
465 |
|
---|
466 | #endif /* module.h */
|
---|
467 |
|
---|
468 | //----------------------------------------------------------------------------
|
---|
469 | //--------end of modutils module.h
|
---|
470 | //----------------------------------------------------------------------------
|
---|
471 |
|
---|
472 |
|
---|
473 |
|
---|
474 | //----------------------------------------------------------------------------
|
---|
475 | //--------modutils obj.h, lines 253-462
|
---|
476 | //----------------------------------------------------------------------------
|
---|
477 |
|
---|
478 | /* Elf object file loading and relocation routines.
|
---|
479 | Copyright 1996, 1997 Linux International.
|
---|
480 |
|
---|
481 | Contributed by Richard Henderson <rth@tamu.edu>
|
---|
482 |
|
---|
483 | This file is part of the Linux modutils.
|
---|
484 |
|
---|
485 | This program is free software; you can redistribute it and/or modify it
|
---|
486 | under the terms of the GNU General Public License as published by the
|
---|
487 | Free Software Foundation; either version 2 of the License, or (at your
|
---|
488 | option) any later version.
|
---|
489 |
|
---|
490 | This program is distributed in the hope that it will be useful, but
|
---|
491 | WITHOUT ANY WARRANTY; without even the implied warranty of
|
---|
492 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
---|
493 | General Public License for more details.
|
---|
494 |
|
---|
495 | You should have received a copy of the GNU General Public License
|
---|
496 | along with this program; if not, write to the Free Software Foundation,
|
---|
497 | Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
|
---|
498 |
|
---|
499 |
|
---|
500 | #ifndef MODUTILS_OBJ_H
|
---|
501 |
|
---|
502 | /* The relocatable object is manipulated using elfin types. */
|
---|
503 |
|
---|
504 | #include <elf.h>
|
---|
505 | #include <endian.h>
|
---|
506 |
|
---|
507 | #ifndef ElfW
|
---|
508 | # if ELFCLASSM == ELFCLASS32
|
---|
509 | # define ElfW(x) Elf32_ ## x
|
---|
510 | # define ELFW(x) ELF32_ ## x
|
---|
511 | # else
|
---|
512 | # define ElfW(x) Elf64_ ## x
|
---|
513 | # define ELFW(x) ELF64_ ## x
|
---|
514 | # endif
|
---|
515 | #endif
|
---|
516 |
|
---|
517 | /* For some reason this is missing from some ancient C libraries.... */
|
---|
518 | #ifndef ELF32_ST_INFO
|
---|
519 | # define ELF32_ST_INFO(bind, type) (((bind) << 4) + ((type) & 0xf))
|
---|
520 | #endif
|
---|
521 |
|
---|
522 | #ifndef ELF64_ST_INFO
|
---|
523 | # define ELF64_ST_INFO(bind, type) (((bind) << 4) + ((type) & 0xf))
|
---|
524 | #endif
|
---|
525 |
|
---|
526 | #define ELF_ST_BIND(info) ELFW(ST_BIND)(info)
|
---|
527 | #define ELF_ST_TYPE(info) ELFW(ST_TYPE)(info)
|
---|
528 | #define ELF_ST_INFO(bind, type) ELFW(ST_INFO)(bind, type)
|
---|
529 | #define ELF_R_TYPE(val) ELFW(R_TYPE)(val)
|
---|
530 | #define ELF_R_SYM(val) ELFW(R_SYM)(val)
|
---|
531 |
|
---|
532 | struct obj_string_patch;
|
---|
533 | struct obj_symbol_patch;
|
---|
534 |
|
---|
535 | struct obj_section {
|
---|
536 | ElfW(Shdr) header;
|
---|
537 | const char *name;
|
---|
538 | char *contents;
|
---|
539 | struct obj_section *load_next;
|
---|
540 | int idx;
|
---|
541 | };
|
---|
542 |
|
---|
543 | struct obj_symbol {
|
---|
544 | struct obj_symbol *next; /* hash table link */
|
---|
545 | const char *name;
|
---|
546 | unsigned long value;
|
---|
547 | unsigned long size;
|
---|
548 | int secidx; /* the defining section index/module */
|
---|
549 | int info;
|
---|
550 | int ksymidx; /* for export to the kernel symtab */
|
---|
551 | int referenced; /* actually used in the link */
|
---|
552 | };
|
---|
553 |
|
---|
554 | /* Hardcode the hash table size. We shouldn't be needing so many
|
---|
555 | symbols that we begin to degrade performance, and we get a big win
|
---|
556 | by giving the compiler a constant divisor. */
|
---|
557 |
|
---|
558 | #define HASH_BUCKETS 521
|
---|
559 |
|
---|
560 | struct obj_file {
|
---|
561 | ElfW(Ehdr) header;
|
---|
562 | ElfW(Addr) baseaddr;
|
---|
563 | struct obj_section **sections;
|
---|
564 | struct obj_section *load_order;
|
---|
565 | struct obj_section **load_order_search_start;
|
---|
566 | struct obj_string_patch *string_patches;
|
---|
567 | struct obj_symbol_patch *symbol_patches;
|
---|
568 | int (*symbol_cmp)(const char *, const char *); /* cant be FAST_FUNC */
|
---|
569 | unsigned long (*symbol_hash)(const char *) FAST_FUNC;
|
---|
570 | unsigned long local_symtab_size;
|
---|
571 | struct obj_symbol **local_symtab;
|
---|
572 | struct obj_symbol *symtab[HASH_BUCKETS];
|
---|
573 | };
|
---|
574 |
|
---|
575 | enum obj_reloc {
|
---|
576 | obj_reloc_ok,
|
---|
577 | obj_reloc_overflow,
|
---|
578 | obj_reloc_dangerous,
|
---|
579 | obj_reloc_unhandled
|
---|
580 | };
|
---|
581 |
|
---|
582 | struct obj_string_patch {
|
---|
583 | struct obj_string_patch *next;
|
---|
584 | int reloc_secidx;
|
---|
585 | ElfW(Addr) reloc_offset;
|
---|
586 | ElfW(Addr) string_offset;
|
---|
587 | };
|
---|
588 |
|
---|
589 | struct obj_symbol_patch {
|
---|
590 | struct obj_symbol_patch *next;
|
---|
591 | int reloc_secidx;
|
---|
592 | ElfW(Addr) reloc_offset;
|
---|
593 | struct obj_symbol *sym;
|
---|
594 | };
|
---|
595 |
|
---|
596 |
|
---|
597 | /* Generic object manipulation routines. */
|
---|
598 |
|
---|
599 | static unsigned long FAST_FUNC obj_elf_hash(const char *);
|
---|
600 |
|
---|
601 | static unsigned long obj_elf_hash_n(const char *, unsigned long len);
|
---|
602 |
|
---|
603 | static struct obj_symbol *obj_find_symbol(struct obj_file *f,
|
---|
604 | const char *name);
|
---|
605 |
|
---|
606 | static ElfW(Addr) obj_symbol_final_value(struct obj_file *f,
|
---|
607 | struct obj_symbol *sym);
|
---|
608 |
|
---|
609 | #if ENABLE_FEATURE_INSMOD_VERSION_CHECKING
|
---|
610 | static void obj_set_symbol_compare(struct obj_file *f,
|
---|
611 | int (*cmp)(const char *, const char *),
|
---|
612 | unsigned long (*hash)(const char *) FAST_FUNC);
|
---|
613 | #endif
|
---|
614 |
|
---|
615 | static struct obj_section *obj_find_section(struct obj_file *f,
|
---|
616 | const char *name);
|
---|
617 |
|
---|
618 | static void obj_insert_section_load_order(struct obj_file *f,
|
---|
619 | struct obj_section *sec);
|
---|
620 |
|
---|
621 | static struct obj_section *obj_create_alloced_section(struct obj_file *f,
|
---|
622 | const char *name,
|
---|
623 | unsigned long align,
|
---|
624 | unsigned long size);
|
---|
625 |
|
---|
626 | static struct obj_section *obj_create_alloced_section_first(struct obj_file *f,
|
---|
627 | const char *name,
|
---|
628 | unsigned long align,
|
---|
629 | unsigned long size);
|
---|
630 |
|
---|
631 | static void *obj_extend_section(struct obj_section *sec, unsigned long more);
|
---|
632 |
|
---|
633 | static void obj_string_patch(struct obj_file *f, int secidx, ElfW(Addr) offset,
|
---|
634 | const char *string);
|
---|
635 |
|
---|
636 | static void obj_symbol_patch(struct obj_file *f, int secidx, ElfW(Addr) offset,
|
---|
637 | struct obj_symbol *sym);
|
---|
638 |
|
---|
639 | static void obj_check_undefineds(struct obj_file *f);
|
---|
640 |
|
---|
641 | static void obj_allocate_commons(struct obj_file *f);
|
---|
642 |
|
---|
643 | static unsigned long obj_load_size(struct obj_file *f);
|
---|
644 |
|
---|
645 | static int obj_relocate(struct obj_file *f, ElfW(Addr) base);
|
---|
646 |
|
---|
647 | #if !LOADBITS
|
---|
648 | #define obj_load(image, image_size, loadprogbits) \
|
---|
649 | obj_load(image, image_size)
|
---|
650 | #endif
|
---|
651 | static struct obj_file *obj_load(char *image, size_t image_size, int loadprogbits);
|
---|
652 |
|
---|
653 | static int obj_create_image(struct obj_file *f, char *image);
|
---|
654 |
|
---|
655 | /* Architecture specific manipulation routines. */
|
---|
656 |
|
---|
657 | static struct obj_file *arch_new_file(void);
|
---|
658 |
|
---|
659 | static struct obj_section *arch_new_section(void);
|
---|
660 |
|
---|
661 | static struct obj_symbol *arch_new_symbol(void);
|
---|
662 |
|
---|
663 | static enum obj_reloc arch_apply_relocation(struct obj_file *f,
|
---|
664 | struct obj_section *targsec,
|
---|
665 | /*struct obj_section *symsec,*/
|
---|
666 | struct obj_symbol *sym,
|
---|
667 | ElfW(RelM) *rel, ElfW(Addr) value);
|
---|
668 |
|
---|
669 | static void arch_create_got(struct obj_file *f);
|
---|
670 | #if ENABLE_FEATURE_CHECK_TAINTED_MODULE
|
---|
671 | static int obj_gpl_license(struct obj_file *f, const char **license);
|
---|
672 | #endif
|
---|
673 | #endif /* obj.h */
|
---|
674 | //----------------------------------------------------------------------------
|
---|
675 | //--------end of modutils obj.h
|
---|
676 | //----------------------------------------------------------------------------
|
---|
677 |
|
---|
678 |
|
---|
679 | /* SPFX is always a string, so it can be concatenated to string constants. */
|
---|
680 | #ifdef SYMBOL_PREFIX
|
---|
681 | #define SPFX SYMBOL_PREFIX
|
---|
682 | #else
|
---|
683 | #define SPFX ""
|
---|
684 | #endif
|
---|
685 |
|
---|
686 | enum { STRVERSIONLEN = 64 };
|
---|
687 |
|
---|
688 | /*======================================================================*/
|
---|
689 |
|
---|
690 | #define flag_force_load (option_mask32 & INSMOD_OPT_FORCE)
|
---|
691 | #define flag_autoclean (option_mask32 & INSMOD_OPT_KERNELD)
|
---|
692 | #define flag_verbose (option_mask32 & INSMOD_OPT_VERBOSE)
|
---|
693 | #define flag_quiet (option_mask32 & INSMOD_OPT_SILENT)
|
---|
694 | #define flag_noexport (option_mask32 & INSMOD_OPT_NO_EXPORT)
|
---|
695 | #define flag_print_load_map (option_mask32 & INSMOD_OPT_PRINT_MAP)
|
---|
696 |
|
---|
697 | /*======================================================================*/
|
---|
698 |
|
---|
699 | #if defined(USE_LIST)
|
---|
700 |
|
---|
701 | struct arch_list_entry {
|
---|
702 | struct arch_list_entry *next;
|
---|
703 | LIST_ARCHTYPE addend;
|
---|
704 | int offset;
|
---|
705 | int inited : 1;
|
---|
706 | };
|
---|
707 |
|
---|
708 | #endif
|
---|
709 |
|
---|
710 | #if defined(USE_SINGLE)
|
---|
711 |
|
---|
712 | struct arch_single_entry {
|
---|
713 | int offset;
|
---|
714 | int inited : 1;
|
---|
715 | int allocated : 1;
|
---|
716 | };
|
---|
717 |
|
---|
718 | #endif
|
---|
719 |
|
---|
720 | #if defined(__mips__)
|
---|
721 | struct mips_hi16 {
|
---|
722 | struct mips_hi16 *next;
|
---|
723 | ElfW(Addr) *addr;
|
---|
724 | ElfW(Addr) value;
|
---|
725 | };
|
---|
726 | #endif
|
---|
727 |
|
---|
728 | struct arch_file {
|
---|
729 | struct obj_file root;
|
---|
730 | #if defined(USE_PLT_ENTRIES)
|
---|
731 | struct obj_section *plt;
|
---|
732 | #endif
|
---|
733 | #if defined(USE_GOT_ENTRIES)
|
---|
734 | struct obj_section *got;
|
---|
735 | #endif
|
---|
736 | #if defined(__mips__)
|
---|
737 | struct mips_hi16 *mips_hi16_list;
|
---|
738 | #endif
|
---|
739 | };
|
---|
740 |
|
---|
741 | struct arch_symbol {
|
---|
742 | struct obj_symbol root;
|
---|
743 | #if defined(USE_PLT_ENTRIES)
|
---|
744 | #if defined(USE_PLT_LIST)
|
---|
745 | struct arch_list_entry *pltent;
|
---|
746 | #else
|
---|
747 | struct arch_single_entry pltent;
|
---|
748 | #endif
|
---|
749 | #endif
|
---|
750 | #if defined(USE_GOT_ENTRIES)
|
---|
751 | struct arch_single_entry gotent;
|
---|
752 | #endif
|
---|
753 | };
|
---|
754 |
|
---|
755 |
|
---|
756 | struct external_module {
|
---|
757 | const char *name;
|
---|
758 | ElfW(Addr) addr;
|
---|
759 | int used;
|
---|
760 | size_t nsyms;
|
---|
761 | struct new_module_symbol *syms;
|
---|
762 | };
|
---|
763 |
|
---|
764 | static struct new_module_symbol *ksyms;
|
---|
765 | static size_t nksyms;
|
---|
766 |
|
---|
767 | static struct external_module *ext_modules;
|
---|
768 | static int n_ext_modules;
|
---|
769 | static int n_ext_modules_used;
|
---|
770 |
|
---|
771 | /*======================================================================*/
|
---|
772 |
|
---|
773 |
|
---|
774 | static struct obj_file *arch_new_file(void)
|
---|
775 | {
|
---|
776 | struct arch_file *f;
|
---|
777 | f = xzalloc(sizeof(*f));
|
---|
778 | return &f->root; /* it's a first member */
|
---|
779 | }
|
---|
780 |
|
---|
781 | static struct obj_section *arch_new_section(void)
|
---|
782 | {
|
---|
783 | return xzalloc(sizeof(struct obj_section));
|
---|
784 | }
|
---|
785 |
|
---|
786 | static struct obj_symbol *arch_new_symbol(void)
|
---|
787 | {
|
---|
788 | struct arch_symbol *sym;
|
---|
789 | sym = xzalloc(sizeof(*sym));
|
---|
790 | return &sym->root;
|
---|
791 | }
|
---|
792 |
|
---|
793 | static enum obj_reloc
|
---|
794 | arch_apply_relocation(struct obj_file *f,
|
---|
795 | struct obj_section *targsec,
|
---|
796 | /*struct obj_section *symsec,*/
|
---|
797 | struct obj_symbol *sym,
|
---|
798 | ElfW(RelM) *rel, ElfW(Addr) v)
|
---|
799 | {
|
---|
800 | #if defined(__arm__) || defined(__i386__) || defined(__mc68000__) \
|
---|
801 | || defined(__sh__) || defined(__s390__) || defined(__x86_64__) \
|
---|
802 | || defined(__powerpc__) || defined(__mips__)
|
---|
803 | struct arch_file *ifile = (struct arch_file *) f;
|
---|
804 | #endif
|
---|
805 | enum obj_reloc ret = obj_reloc_ok;
|
---|
806 | ElfW(Addr) *loc = (ElfW(Addr) *) (targsec->contents + rel->r_offset);
|
---|
807 | #if defined(__arm__) || defined(__H8300H__) || defined(__H8300S__) \
|
---|
808 | || defined(__i386__) || defined(__mc68000__) || defined(__microblaze__) \
|
---|
809 | || defined(__mips__) || defined(__nios2__) || defined(__powerpc__) \
|
---|
810 | || defined(__s390__) || defined(__sh__) || defined(__x86_64__)
|
---|
811 | ElfW(Addr) dot = targsec->header.sh_addr + rel->r_offset;
|
---|
812 | #endif
|
---|
813 | #if defined(USE_GOT_ENTRIES) || defined(USE_PLT_ENTRIES)
|
---|
814 | struct arch_symbol *isym = (struct arch_symbol *) sym;
|
---|
815 | #endif
|
---|
816 | #if defined(__arm__) || defined(__i386__) || defined(__mc68000__) \
|
---|
817 | || defined(__sh__) || defined(__s390__)
|
---|
818 | #if defined(USE_GOT_ENTRIES)
|
---|
819 | ElfW(Addr) got = ifile->got ? ifile->got->header.sh_addr : 0;
|
---|
820 | #endif
|
---|
821 | #endif
|
---|
822 | #if defined(USE_PLT_ENTRIES)
|
---|
823 | ElfW(Addr) plt = ifile->plt ? ifile->plt->header.sh_addr : 0;
|
---|
824 | unsigned long *ip;
|
---|
825 | # if defined(USE_PLT_LIST)
|
---|
826 | struct arch_list_entry *pe;
|
---|
827 | # else
|
---|
828 | struct arch_single_entry *pe;
|
---|
829 | # endif
|
---|
830 | #endif
|
---|
831 |
|
---|
832 | switch (ELF_R_TYPE(rel->r_info)) {
|
---|
833 |
|
---|
834 | #if defined(__arm__)
|
---|
835 |
|
---|
836 | case R_ARM_NONE:
|
---|
837 | break;
|
---|
838 |
|
---|
839 | case R_ARM_ABS32:
|
---|
840 | *loc += v;
|
---|
841 | break;
|
---|
842 |
|
---|
843 | case R_ARM_GOT32:
|
---|
844 | goto bb_use_got;
|
---|
845 |
|
---|
846 | case R_ARM_GOTPC:
|
---|
847 | /* relative reloc, always to _GLOBAL_OFFSET_TABLE_
|
---|
848 | * (which is .got) similar to branch,
|
---|
849 | * but is full 32 bits relative */
|
---|
850 |
|
---|
851 | *loc += got - dot;
|
---|
852 | break;
|
---|
853 |
|
---|
854 | case R_ARM_PC24:
|
---|
855 | case R_ARM_PLT32:
|
---|
856 | goto bb_use_plt;
|
---|
857 |
|
---|
858 | case R_ARM_GOTOFF: /* address relative to the got */
|
---|
859 | *loc += v - got;
|
---|
860 | break;
|
---|
861 |
|
---|
862 | #elif defined(__cris__)
|
---|
863 |
|
---|
864 | case R_CRIS_NONE:
|
---|
865 | break;
|
---|
866 |
|
---|
867 | case R_CRIS_32:
|
---|
868 | /* CRIS keeps the relocation value in the r_addend field and
|
---|
869 | * should not use whats in *loc at all
|
---|
870 | */
|
---|
871 | *loc = v;
|
---|
872 | break;
|
---|
873 |
|
---|
874 | #elif defined(__H8300H__) || defined(__H8300S__)
|
---|
875 |
|
---|
876 | case R_H8_DIR24R8:
|
---|
877 | loc = (ElfW(Addr) *)((ElfW(Addr))loc - 1);
|
---|
878 | *loc = (*loc & 0xff000000) | ((*loc & 0xffffff) + v);
|
---|
879 | break;
|
---|
880 | case R_H8_DIR24A8:
|
---|
881 | *loc += v;
|
---|
882 | break;
|
---|
883 | case R_H8_DIR32:
|
---|
884 | case R_H8_DIR32A16:
|
---|
885 | *loc += v;
|
---|
886 | break;
|
---|
887 | case R_H8_PCREL16:
|
---|
888 | v -= dot + 2;
|
---|
889 | if ((ElfW(Sword))v > 0x7fff
|
---|
890 | || (ElfW(Sword))v < -(ElfW(Sword))0x8000
|
---|
891 | ) {
|
---|
892 | ret = obj_reloc_overflow;
|
---|
893 | } else {
|
---|
894 | *(unsigned short *)loc = v;
|
---|
895 | }
|
---|
896 | break;
|
---|
897 | case R_H8_PCREL8:
|
---|
898 | v -= dot + 1;
|
---|
899 | if ((ElfW(Sword))v > 0x7f
|
---|
900 | || (ElfW(Sword))v < -(ElfW(Sword))0x80
|
---|
901 | ) {
|
---|
902 | ret = obj_reloc_overflow;
|
---|
903 | } else {
|
---|
904 | *(unsigned char *)loc = v;
|
---|
905 | }
|
---|
906 | break;
|
---|
907 |
|
---|
908 | #elif defined(__i386__)
|
---|
909 |
|
---|
910 | case R_386_NONE:
|
---|
911 | break;
|
---|
912 |
|
---|
913 | case R_386_32:
|
---|
914 | *loc += v;
|
---|
915 | break;
|
---|
916 |
|
---|
917 | case R_386_PLT32:
|
---|
918 | case R_386_PC32:
|
---|
919 | case R_386_GOTOFF:
|
---|
920 | *loc += v - dot;
|
---|
921 | break;
|
---|
922 |
|
---|
923 | case R_386_GLOB_DAT:
|
---|
924 | case R_386_JMP_SLOT:
|
---|
925 | *loc = v;
|
---|
926 | break;
|
---|
927 |
|
---|
928 | case R_386_RELATIVE:
|
---|
929 | *loc += f->baseaddr;
|
---|
930 | break;
|
---|
931 |
|
---|
932 | case R_386_GOTPC:
|
---|
933 | *loc += got - dot;
|
---|
934 | break;
|
---|
935 |
|
---|
936 | case R_386_GOT32:
|
---|
937 | goto bb_use_got;
|
---|
938 | break;
|
---|
939 |
|
---|
940 | #elif defined(__microblaze__)
|
---|
941 | case R_MICROBLAZE_NONE:
|
---|
942 | case R_MICROBLAZE_64_NONE:
|
---|
943 | case R_MICROBLAZE_32_SYM_OP_SYM:
|
---|
944 | case R_MICROBLAZE_32_PCREL:
|
---|
945 | break;
|
---|
946 |
|
---|
947 | case R_MICROBLAZE_64_PCREL: {
|
---|
948 | /* dot is the address of the current instruction.
|
---|
949 | * v is the target symbol address.
|
---|
950 | * So we need to extract the offset in the code,
|
---|
951 | * adding v, then subtrating the current address
|
---|
952 | * of this instruction.
|
---|
953 | * Ex: "IMM 0xFFFE bralid 0x0000" = "bralid 0xFFFE0000"
|
---|
954 | */
|
---|
955 |
|
---|
956 | /* Get split offset stored in code */
|
---|
957 | unsigned int temp = (loc[0] & 0xFFFF) << 16 |
|
---|
958 | (loc[1] & 0xFFFF);
|
---|
959 |
|
---|
960 | /* Adjust relative offset. -4 adjustment required
|
---|
961 | * because dot points to the IMM insn, but branch
|
---|
962 | * is computed relative to the branch instruction itself.
|
---|
963 | */
|
---|
964 | temp += v - dot - 4;
|
---|
965 |
|
---|
966 | /* Store back into code */
|
---|
967 | loc[0] = (loc[0] & 0xFFFF0000) | temp >> 16;
|
---|
968 | loc[1] = (loc[1] & 0xFFFF0000) | (temp & 0xFFFF);
|
---|
969 |
|
---|
970 | break;
|
---|
971 | }
|
---|
972 |
|
---|
973 | case R_MICROBLAZE_32:
|
---|
974 | *loc += v;
|
---|
975 | break;
|
---|
976 |
|
---|
977 | case R_MICROBLAZE_64: {
|
---|
978 | /* Get split pointer stored in code */
|
---|
979 | unsigned int temp1 = (loc[0] & 0xFFFF) << 16 |
|
---|
980 | (loc[1] & 0xFFFF);
|
---|
981 |
|
---|
982 | /* Add reloc offset */
|
---|
983 | temp1+=v;
|
---|
984 |
|
---|
985 | /* Store back into code */
|
---|
986 | loc[0] = (loc[0] & 0xFFFF0000) | temp1 >> 16;
|
---|
987 | loc[1] = (loc[1] & 0xFFFF0000) | (temp1 & 0xFFFF);
|
---|
988 |
|
---|
989 | break;
|
---|
990 | }
|
---|
991 |
|
---|
992 | case R_MICROBLAZE_32_PCREL_LO:
|
---|
993 | case R_MICROBLAZE_32_LO:
|
---|
994 | case R_MICROBLAZE_SRO32:
|
---|
995 | case R_MICROBLAZE_SRW32:
|
---|
996 | ret = obj_reloc_unhandled;
|
---|
997 | break;
|
---|
998 |
|
---|
999 | #elif defined(__mc68000__)
|
---|
1000 |
|
---|
1001 | case R_68K_NONE:
|
---|
1002 | break;
|
---|
1003 |
|
---|
1004 | case R_68K_32:
|
---|
1005 | *loc += v;
|
---|
1006 | break;
|
---|
1007 |
|
---|
1008 | case R_68K_8:
|
---|
1009 | if (v > 0xff) {
|
---|
1010 | ret = obj_reloc_overflow;
|
---|
1011 | }
|
---|
1012 | *(char *)loc = v;
|
---|
1013 | break;
|
---|
1014 |
|
---|
1015 | case R_68K_16:
|
---|
1016 | if (v > 0xffff) {
|
---|
1017 | ret = obj_reloc_overflow;
|
---|
1018 | }
|
---|
1019 | *(short *)loc = v;
|
---|
1020 | break;
|
---|
1021 |
|
---|
1022 | case R_68K_PC8:
|
---|
1023 | v -= dot;
|
---|
1024 | if ((ElfW(Sword))v > 0x7f
|
---|
1025 | || (ElfW(Sword))v < -(ElfW(Sword))0x80
|
---|
1026 | ) {
|
---|
1027 | ret = obj_reloc_overflow;
|
---|
1028 | }
|
---|
1029 | *(char *)loc = v;
|
---|
1030 | break;
|
---|
1031 |
|
---|
1032 | case R_68K_PC16:
|
---|
1033 | v -= dot;
|
---|
1034 | if ((ElfW(Sword))v > 0x7fff
|
---|
1035 | || (ElfW(Sword))v < -(ElfW(Sword))0x8000
|
---|
1036 | ) {
|
---|
1037 | ret = obj_reloc_overflow;
|
---|
1038 | }
|
---|
1039 | *(short *)loc = v;
|
---|
1040 | break;
|
---|
1041 |
|
---|
1042 | case R_68K_PC32:
|
---|
1043 | *(int *)loc = v - dot;
|
---|
1044 | break;
|
---|
1045 |
|
---|
1046 | case R_68K_GLOB_DAT:
|
---|
1047 | case R_68K_JMP_SLOT:
|
---|
1048 | *loc = v;
|
---|
1049 | break;
|
---|
1050 |
|
---|
1051 | case R_68K_RELATIVE:
|
---|
1052 | *(int *)loc += f->baseaddr;
|
---|
1053 | break;
|
---|
1054 |
|
---|
1055 | case R_68K_GOT32:
|
---|
1056 | goto bb_use_got;
|
---|
1057 |
|
---|
1058 | # ifdef R_68K_GOTOFF
|
---|
1059 | case R_68K_GOTOFF:
|
---|
1060 | *loc += v - got;
|
---|
1061 | break;
|
---|
1062 | # endif
|
---|
1063 |
|
---|
1064 | #elif defined(__mips__)
|
---|
1065 |
|
---|
1066 | case R_MIPS_NONE:
|
---|
1067 | break;
|
---|
1068 |
|
---|
1069 | case R_MIPS_32:
|
---|
1070 | *loc += v;
|
---|
1071 | break;
|
---|
1072 |
|
---|
1073 | case R_MIPS_26:
|
---|
1074 | if (v % 4)
|
---|
1075 | ret = obj_reloc_dangerous;
|
---|
1076 | if ((v & 0xf0000000) != ((dot + 4) & 0xf0000000))
|
---|
1077 | ret = obj_reloc_overflow;
|
---|
1078 | *loc =
|
---|
1079 | (*loc & ~0x03ffffff) | ((*loc + (v >> 2)) &
|
---|
1080 | 0x03ffffff);
|
---|
1081 | break;
|
---|
1082 |
|
---|
1083 | case R_MIPS_HI16:
|
---|
1084 | {
|
---|
1085 | struct mips_hi16 *n;
|
---|
1086 |
|
---|
1087 | /* We cannot relocate this one now because we don't know the value
|
---|
1088 | of the carry we need to add. Save the information, and let LO16
|
---|
1089 | do the actual relocation. */
|
---|
1090 | n = xmalloc(sizeof *n);
|
---|
1091 | n->addr = loc;
|
---|
1092 | n->value = v;
|
---|
1093 | n->next = ifile->mips_hi16_list;
|
---|
1094 | ifile->mips_hi16_list = n;
|
---|
1095 | break;
|
---|
1096 | }
|
---|
1097 |
|
---|
1098 | case R_MIPS_LO16:
|
---|
1099 | {
|
---|
1100 | unsigned long insnlo = *loc;
|
---|
1101 | ElfW(Addr) val, vallo;
|
---|
1102 |
|
---|
1103 | /* Sign extend the addend we extract from the lo insn. */
|
---|
1104 | vallo = ((insnlo & 0xffff) ^ 0x8000) - 0x8000;
|
---|
1105 |
|
---|
1106 | if (ifile->mips_hi16_list != NULL) {
|
---|
1107 | struct mips_hi16 *l;
|
---|
1108 |
|
---|
1109 | l = ifile->mips_hi16_list;
|
---|
1110 | while (l != NULL) {
|
---|
1111 | struct mips_hi16 *next;
|
---|
1112 | unsigned long insn;
|
---|
1113 |
|
---|
1114 | /* Do the HI16 relocation. Note that we actually don't
|
---|
1115 | need to know anything about the LO16 itself, except where
|
---|
1116 | to find the low 16 bits of the addend needed by the LO16. */
|
---|
1117 | insn = *l->addr;
|
---|
1118 | val =
|
---|
1119 | ((insn & 0xffff) << 16) +
|
---|
1120 | vallo;
|
---|
1121 | val += v;
|
---|
1122 |
|
---|
1123 | /* Account for the sign extension that will happen in the
|
---|
1124 | low bits. */
|
---|
1125 | val =
|
---|
1126 | ((val >> 16) +
|
---|
1127 | ((val & 0x8000) !=
|
---|
1128 | 0)) & 0xffff;
|
---|
1129 |
|
---|
1130 | insn = (insn & ~0xffff) | val;
|
---|
1131 | *l->addr = insn;
|
---|
1132 |
|
---|
1133 | next = l->next;
|
---|
1134 | free(l);
|
---|
1135 | l = next;
|
---|
1136 | }
|
---|
1137 |
|
---|
1138 | ifile->mips_hi16_list = NULL;
|
---|
1139 | }
|
---|
1140 |
|
---|
1141 | /* Ok, we're done with the HI16 relocs. Now deal with the LO16. */
|
---|
1142 | val = v + vallo;
|
---|
1143 | insnlo = (insnlo & ~0xffff) | (val & 0xffff);
|
---|
1144 | *loc = insnlo;
|
---|
1145 | break;
|
---|
1146 | }
|
---|
1147 |
|
---|
1148 | #elif defined(__nios2__)
|
---|
1149 |
|
---|
1150 | case R_NIOS2_NONE:
|
---|
1151 | break;
|
---|
1152 |
|
---|
1153 | case R_NIOS2_BFD_RELOC_32:
|
---|
1154 | *loc += v;
|
---|
1155 | break;
|
---|
1156 |
|
---|
1157 | case R_NIOS2_BFD_RELOC_16:
|
---|
1158 | if (v > 0xffff) {
|
---|
1159 | ret = obj_reloc_overflow;
|
---|
1160 | }
|
---|
1161 | *(short *)loc = v;
|
---|
1162 | break;
|
---|
1163 |
|
---|
1164 | case R_NIOS2_BFD_RELOC_8:
|
---|
1165 | if (v > 0xff) {
|
---|
1166 | ret = obj_reloc_overflow;
|
---|
1167 | }
|
---|
1168 | *(char *)loc = v;
|
---|
1169 | break;
|
---|
1170 |
|
---|
1171 | case R_NIOS2_S16:
|
---|
1172 | {
|
---|
1173 | Elf32_Addr word;
|
---|
1174 |
|
---|
1175 | if ((Elf32_Sword)v > 0x7fff
|
---|
1176 | || (Elf32_Sword)v < -(Elf32_Sword)0x8000
|
---|
1177 | ) {
|
---|
1178 | ret = obj_reloc_overflow;
|
---|
1179 | }
|
---|
1180 |
|
---|
1181 | word = *loc;
|
---|
1182 | *loc = ((((word >> 22) << 16) | (v & 0xffff)) << 6) |
|
---|
1183 | (word & 0x3f);
|
---|
1184 | }
|
---|
1185 | break;
|
---|
1186 |
|
---|
1187 | case R_NIOS2_U16:
|
---|
1188 | {
|
---|
1189 | Elf32_Addr word;
|
---|
1190 |
|
---|
1191 | if (v > 0xffff) {
|
---|
1192 | ret = obj_reloc_overflow;
|
---|
1193 | }
|
---|
1194 |
|
---|
1195 | word = *loc;
|
---|
1196 | *loc = ((((word >> 22) << 16) | (v & 0xffff)) << 6) |
|
---|
1197 | (word & 0x3f);
|
---|
1198 | }
|
---|
1199 | break;
|
---|
1200 |
|
---|
1201 | case R_NIOS2_PCREL16:
|
---|
1202 | {
|
---|
1203 | Elf32_Addr word;
|
---|
1204 |
|
---|
1205 | v -= dot + 4;
|
---|
1206 | if ((Elf32_Sword)v > 0x7fff
|
---|
1207 | || (Elf32_Sword)v < -(Elf32_Sword)0x8000
|
---|
1208 | ) {
|
---|
1209 | ret = obj_reloc_overflow;
|
---|
1210 | }
|
---|
1211 |
|
---|
1212 | word = *loc;
|
---|
1213 | *loc = ((((word >> 22) << 16) | (v & 0xffff)) << 6) | (word & 0x3f);
|
---|
1214 | }
|
---|
1215 | break;
|
---|
1216 |
|
---|
1217 | case R_NIOS2_GPREL:
|
---|
1218 | {
|
---|
1219 | Elf32_Addr word, gp;
|
---|
1220 | /* get _gp */
|
---|
1221 | gp = obj_symbol_final_value(f, obj_find_symbol(f, SPFX "_gp"));
|
---|
1222 | v -= gp;
|
---|
1223 | if ((Elf32_Sword)v > 0x7fff
|
---|
1224 | || (Elf32_Sword)v < -(Elf32_Sword)0x8000
|
---|
1225 | ) {
|
---|
1226 | ret = obj_reloc_overflow;
|
---|
1227 | }
|
---|
1228 |
|
---|
1229 | word = *loc;
|
---|
1230 | *loc = ((((word >> 22) << 16) | (v & 0xffff)) << 6) | (word & 0x3f);
|
---|
1231 | }
|
---|
1232 | break;
|
---|
1233 |
|
---|
1234 | case R_NIOS2_CALL26:
|
---|
1235 | if (v & 3)
|
---|
1236 | ret = obj_reloc_dangerous;
|
---|
1237 | if ((v >> 28) != (dot >> 28))
|
---|
1238 | ret = obj_reloc_overflow;
|
---|
1239 | *loc = (*loc & 0x3f) | ((v >> 2) << 6);
|
---|
1240 | break;
|
---|
1241 |
|
---|
1242 | case R_NIOS2_IMM5:
|
---|
1243 | {
|
---|
1244 | Elf32_Addr word;
|
---|
1245 |
|
---|
1246 | if (v > 0x1f) {
|
---|
1247 | ret = obj_reloc_overflow;
|
---|
1248 | }
|
---|
1249 |
|
---|
1250 | word = *loc & ~0x7c0;
|
---|
1251 | *loc = word | ((v & 0x1f) << 6);
|
---|
1252 | }
|
---|
1253 | break;
|
---|
1254 |
|
---|
1255 | case R_NIOS2_IMM6:
|
---|
1256 | {
|
---|
1257 | Elf32_Addr word;
|
---|
1258 |
|
---|
1259 | if (v > 0x3f) {
|
---|
1260 | ret = obj_reloc_overflow;
|
---|
1261 | }
|
---|
1262 |
|
---|
1263 | word = *loc & ~0xfc0;
|
---|
1264 | *loc = word | ((v & 0x3f) << 6);
|
---|
1265 | }
|
---|
1266 | break;
|
---|
1267 |
|
---|
1268 | case R_NIOS2_IMM8:
|
---|
1269 | {
|
---|
1270 | Elf32_Addr word;
|
---|
1271 |
|
---|
1272 | if (v > 0xff) {
|
---|
1273 | ret = obj_reloc_overflow;
|
---|
1274 | }
|
---|
1275 |
|
---|
1276 | word = *loc & ~0x3fc0;
|
---|
1277 | *loc = word | ((v & 0xff) << 6);
|
---|
1278 | }
|
---|
1279 | break;
|
---|
1280 |
|
---|
1281 | case R_NIOS2_HI16:
|
---|
1282 | {
|
---|
1283 | Elf32_Addr word;
|
---|
1284 |
|
---|
1285 | word = *loc;
|
---|
1286 | *loc = ((((word >> 22) << 16) | ((v >>16) & 0xffff)) << 6) |
|
---|
1287 | (word & 0x3f);
|
---|
1288 | }
|
---|
1289 | break;
|
---|
1290 |
|
---|
1291 | case R_NIOS2_LO16:
|
---|
1292 | {
|
---|
1293 | Elf32_Addr word;
|
---|
1294 |
|
---|
1295 | word = *loc;
|
---|
1296 | *loc = ((((word >> 22) << 16) | (v & 0xffff)) << 6) |
|
---|
1297 | (word & 0x3f);
|
---|
1298 | }
|
---|
1299 | break;
|
---|
1300 |
|
---|
1301 | case R_NIOS2_HIADJ16:
|
---|
1302 | {
|
---|
1303 | Elf32_Addr word1, word2;
|
---|
1304 |
|
---|
1305 | word1 = *loc;
|
---|
1306 | word2 = ((v >> 16) + ((v >> 15) & 1)) & 0xffff;
|
---|
1307 | *loc = ((((word1 >> 22) << 16) | word2) << 6) |
|
---|
1308 | (word1 & 0x3f);
|
---|
1309 | }
|
---|
1310 | break;
|
---|
1311 |
|
---|
1312 | #elif defined(__powerpc64__)
|
---|
1313 | /* PPC64 needs a 2.6 kernel, 2.4 module relocation irrelevant */
|
---|
1314 |
|
---|
1315 | #elif defined(__powerpc__)
|
---|
1316 |
|
---|
1317 | case R_PPC_ADDR16_HA:
|
---|
1318 | *(unsigned short *)loc = (v + 0x8000) >> 16;
|
---|
1319 | break;
|
---|
1320 |
|
---|
1321 | case R_PPC_ADDR16_HI:
|
---|
1322 | *(unsigned short *)loc = v >> 16;
|
---|
1323 | break;
|
---|
1324 |
|
---|
1325 | case R_PPC_ADDR16_LO:
|
---|
1326 | *(unsigned short *)loc = v;
|
---|
1327 | break;
|
---|
1328 |
|
---|
1329 | case R_PPC_REL24:
|
---|
1330 | goto bb_use_plt;
|
---|
1331 |
|
---|
1332 | case R_PPC_REL32:
|
---|
1333 | *loc = v - dot;
|
---|
1334 | break;
|
---|
1335 |
|
---|
1336 | case R_PPC_ADDR32:
|
---|
1337 | *loc = v;
|
---|
1338 | break;
|
---|
1339 |
|
---|
1340 | #elif defined(__s390__)
|
---|
1341 |
|
---|
1342 | case R_390_32:
|
---|
1343 | *(unsigned int *) loc += v;
|
---|
1344 | break;
|
---|
1345 | case R_390_16:
|
---|
1346 | *(unsigned short *) loc += v;
|
---|
1347 | break;
|
---|
1348 | case R_390_8:
|
---|
1349 | *(unsigned char *) loc += v;
|
---|
1350 | break;
|
---|
1351 |
|
---|
1352 | case R_390_PC32:
|
---|
1353 | *(unsigned int *) loc += v - dot;
|
---|
1354 | break;
|
---|
1355 | case R_390_PC16DBL:
|
---|
1356 | *(unsigned short *) loc += (v - dot) >> 1;
|
---|
1357 | break;
|
---|
1358 | case R_390_PC16:
|
---|
1359 | *(unsigned short *) loc += v - dot;
|
---|
1360 | break;
|
---|
1361 |
|
---|
1362 | case R_390_PLT32:
|
---|
1363 | case R_390_PLT16DBL:
|
---|
1364 | /* find the plt entry and initialize it. */
|
---|
1365 | pe = (struct arch_single_entry *) &isym->pltent;
|
---|
1366 | if (pe->inited == 0) {
|
---|
1367 | ip = (unsigned long *)(ifile->plt->contents + pe->offset);
|
---|
1368 | ip[0] = 0x0d105810; /* basr 1,0; lg 1,10(1); br 1 */
|
---|
1369 | ip[1] = 0x100607f1;
|
---|
1370 | if (ELF_R_TYPE(rel->r_info) == R_390_PLT16DBL)
|
---|
1371 | ip[2] = v - 2;
|
---|
1372 | else
|
---|
1373 | ip[2] = v;
|
---|
1374 | pe->inited = 1;
|
---|
1375 | }
|
---|
1376 |
|
---|
1377 | /* Insert relative distance to target. */
|
---|
1378 | v = plt + pe->offset - dot;
|
---|
1379 | if (ELF_R_TYPE(rel->r_info) == R_390_PLT32)
|
---|
1380 | *(unsigned int *) loc = (unsigned int) v;
|
---|
1381 | else if (ELF_R_TYPE(rel->r_info) == R_390_PLT16DBL)
|
---|
1382 | *(unsigned short *) loc = (unsigned short) ((v + 2) >> 1);
|
---|
1383 | break;
|
---|
1384 |
|
---|
1385 | case R_390_GLOB_DAT:
|
---|
1386 | case R_390_JMP_SLOT:
|
---|
1387 | *loc = v;
|
---|
1388 | break;
|
---|
1389 |
|
---|
1390 | case R_390_RELATIVE:
|
---|
1391 | *loc += f->baseaddr;
|
---|
1392 | break;
|
---|
1393 |
|
---|
1394 | case R_390_GOTPC:
|
---|
1395 | *(unsigned long *) loc += got - dot;
|
---|
1396 | break;
|
---|
1397 |
|
---|
1398 | case R_390_GOT12:
|
---|
1399 | case R_390_GOT16:
|
---|
1400 | case R_390_GOT32:
|
---|
1401 | if (!isym->gotent.inited)
|
---|
1402 | {
|
---|
1403 | isym->gotent.inited = 1;
|
---|
1404 | *(ElfW(Addr) *)(ifile->got->contents + isym->gotent.offset) = v;
|
---|
1405 | }
|
---|
1406 | if (ELF_R_TYPE(rel->r_info) == R_390_GOT12)
|
---|
1407 | *(unsigned short *) loc |= (*(unsigned short *) loc + isym->gotent.offset) & 0xfff;
|
---|
1408 | else if (ELF_R_TYPE(rel->r_info) == R_390_GOT16)
|
---|
1409 | *(unsigned short *) loc += isym->gotent.offset;
|
---|
1410 | else if (ELF_R_TYPE(rel->r_info) == R_390_GOT32)
|
---|
1411 | *(unsigned int *) loc += isym->gotent.offset;
|
---|
1412 | break;
|
---|
1413 |
|
---|
1414 | # ifndef R_390_GOTOFF32
|
---|
1415 | # define R_390_GOTOFF32 R_390_GOTOFF
|
---|
1416 | # endif
|
---|
1417 | case R_390_GOTOFF32:
|
---|
1418 | *loc += v - got;
|
---|
1419 | break;
|
---|
1420 |
|
---|
1421 | #elif defined(__sh__)
|
---|
1422 |
|
---|
1423 | case R_SH_NONE:
|
---|
1424 | break;
|
---|
1425 |
|
---|
1426 | case R_SH_DIR32:
|
---|
1427 | *loc += v;
|
---|
1428 | break;
|
---|
1429 |
|
---|
1430 | case R_SH_REL32:
|
---|
1431 | *loc += v - dot;
|
---|
1432 | break;
|
---|
1433 |
|
---|
1434 | case R_SH_PLT32:
|
---|
1435 | *loc = v - dot;
|
---|
1436 | break;
|
---|
1437 |
|
---|
1438 | case R_SH_GLOB_DAT:
|
---|
1439 | case R_SH_JMP_SLOT:
|
---|
1440 | *loc = v;
|
---|
1441 | break;
|
---|
1442 |
|
---|
1443 | case R_SH_RELATIVE:
|
---|
1444 | *loc = f->baseaddr + rel->r_addend;
|
---|
1445 | break;
|
---|
1446 |
|
---|
1447 | case R_SH_GOTPC:
|
---|
1448 | *loc = got - dot + rel->r_addend;
|
---|
1449 | break;
|
---|
1450 |
|
---|
1451 | case R_SH_GOT32:
|
---|
1452 | goto bb_use_got;
|
---|
1453 |
|
---|
1454 | case R_SH_GOTOFF:
|
---|
1455 | *loc = v - got;
|
---|
1456 | break;
|
---|
1457 |
|
---|
1458 | # if defined(__SH5__)
|
---|
1459 | case R_SH_IMM_MEDLOW16:
|
---|
1460 | case R_SH_IMM_LOW16:
|
---|
1461 | {
|
---|
1462 | ElfW(Addr) word;
|
---|
1463 |
|
---|
1464 | if (ELF_R_TYPE(rel->r_info) == R_SH_IMM_MEDLOW16)
|
---|
1465 | v >>= 16;
|
---|
1466 |
|
---|
1467 | /*
|
---|
1468 | * movi and shori have the format:
|
---|
1469 | *
|
---|
1470 | * | op | imm | reg | reserved |
|
---|
1471 | * 31..26 25..10 9.. 4 3 .. 0
|
---|
1472 | *
|
---|
1473 | * so we simply mask and or in imm.
|
---|
1474 | */
|
---|
1475 | word = *loc & ~0x3fffc00;
|
---|
1476 | word |= (v & 0xffff) << 10;
|
---|
1477 |
|
---|
1478 | *loc = word;
|
---|
1479 |
|
---|
1480 | break;
|
---|
1481 | }
|
---|
1482 |
|
---|
1483 | case R_SH_IMM_MEDLOW16_PCREL:
|
---|
1484 | case R_SH_IMM_LOW16_PCREL:
|
---|
1485 | {
|
---|
1486 | ElfW(Addr) word;
|
---|
1487 |
|
---|
1488 | word = *loc & ~0x3fffc00;
|
---|
1489 |
|
---|
1490 | v -= dot;
|
---|
1491 |
|
---|
1492 | if (ELF_R_TYPE(rel->r_info) == R_SH_IMM_MEDLOW16_PCREL)
|
---|
1493 | v >>= 16;
|
---|
1494 |
|
---|
1495 | word |= (v & 0xffff) << 10;
|
---|
1496 |
|
---|
1497 | *loc = word;
|
---|
1498 |
|
---|
1499 | break;
|
---|
1500 | }
|
---|
1501 | # endif /* __SH5__ */
|
---|
1502 |
|
---|
1503 | #elif defined(__v850e__)
|
---|
1504 |
|
---|
1505 | case R_V850_NONE:
|
---|
1506 | break;
|
---|
1507 |
|
---|
1508 | case R_V850_32:
|
---|
1509 | /* We write two shorts instead of a long because even
|
---|
1510 | 32-bit insns only need half-word alignment, but
|
---|
1511 | 32-bit data needs to be long-word aligned. */
|
---|
1512 | v += ((unsigned short *)loc)[0];
|
---|
1513 | v += ((unsigned short *)loc)[1] << 16;
|
---|
1514 | ((unsigned short *)loc)[0] = v & 0xffff;
|
---|
1515 | ((unsigned short *)loc)[1] = (v >> 16) & 0xffff;
|
---|
1516 | break;
|
---|
1517 |
|
---|
1518 | case R_V850_22_PCREL:
|
---|
1519 | goto bb_use_plt;
|
---|
1520 |
|
---|
1521 | #elif defined(__x86_64__)
|
---|
1522 |
|
---|
1523 | case R_X86_64_NONE:
|
---|
1524 | break;
|
---|
1525 |
|
---|
1526 | case R_X86_64_64:
|
---|
1527 | *loc += v;
|
---|
1528 | break;
|
---|
1529 |
|
---|
1530 | case R_X86_64_32:
|
---|
1531 | *(unsigned int *) loc += v;
|
---|
1532 | if (v > 0xffffffff)
|
---|
1533 | {
|
---|
1534 | ret = obj_reloc_overflow; /* Kernel module compiled without -mcmodel=kernel. */
|
---|
1535 | /* error("Possibly is module compiled without -mcmodel=kernel!"); */
|
---|
1536 | }
|
---|
1537 | break;
|
---|
1538 |
|
---|
1539 | case R_X86_64_32S:
|
---|
1540 | *(signed int *) loc += v;
|
---|
1541 | break;
|
---|
1542 |
|
---|
1543 | case R_X86_64_16:
|
---|
1544 | *(unsigned short *) loc += v;
|
---|
1545 | break;
|
---|
1546 |
|
---|
1547 | case R_X86_64_8:
|
---|
1548 | *(unsigned char *) loc += v;
|
---|
1549 | break;
|
---|
1550 |
|
---|
1551 | case R_X86_64_PC32:
|
---|
1552 | *(unsigned int *) loc += v - dot;
|
---|
1553 | break;
|
---|
1554 |
|
---|
1555 | case R_X86_64_PC16:
|
---|
1556 | *(unsigned short *) loc += v - dot;
|
---|
1557 | break;
|
---|
1558 |
|
---|
1559 | case R_X86_64_PC8:
|
---|
1560 | *(unsigned char *) loc += v - dot;
|
---|
1561 | break;
|
---|
1562 |
|
---|
1563 | case R_X86_64_GLOB_DAT:
|
---|
1564 | case R_X86_64_JUMP_SLOT:
|
---|
1565 | *loc = v;
|
---|
1566 | break;
|
---|
1567 |
|
---|
1568 | case R_X86_64_RELATIVE:
|
---|
1569 | *loc += f->baseaddr;
|
---|
1570 | break;
|
---|
1571 |
|
---|
1572 | case R_X86_64_GOT32:
|
---|
1573 | case R_X86_64_GOTPCREL:
|
---|
1574 | goto bb_use_got;
|
---|
1575 | # if 0
|
---|
1576 | if (!isym->gotent.reloc_done)
|
---|
1577 | {
|
---|
1578 | isym->gotent.reloc_done = 1;
|
---|
1579 | *(Elf64_Addr *)(ifile->got->contents + isym->gotent.offset) = v;
|
---|
1580 | }
|
---|
1581 | /* XXX are these really correct? */
|
---|
1582 | if (ELF64_R_TYPE(rel->r_info) == R_X86_64_GOTPCREL)
|
---|
1583 | *(unsigned int *) loc += v + isym->gotent.offset;
|
---|
1584 | else
|
---|
1585 | *loc += isym->gotent.offset;
|
---|
1586 | break;
|
---|
1587 | # endif
|
---|
1588 |
|
---|
1589 | #else
|
---|
1590 | # warning "no idea how to handle relocations on your arch"
|
---|
1591 | #endif
|
---|
1592 |
|
---|
1593 | default:
|
---|
1594 | printf("Warning: unhandled reloc %d\n", (int)ELF_R_TYPE(rel->r_info));
|
---|
1595 | ret = obj_reloc_unhandled;
|
---|
1596 | break;
|
---|
1597 |
|
---|
1598 | #if defined(USE_PLT_ENTRIES)
|
---|
1599 |
|
---|
1600 | bb_use_plt:
|
---|
1601 |
|
---|
1602 | /* find the plt entry and initialize it if necessary */
|
---|
1603 |
|
---|
1604 | #if defined(USE_PLT_LIST)
|
---|
1605 | for (pe = isym->pltent; pe != NULL && pe->addend != rel->r_addend;)
|
---|
1606 | pe = pe->next;
|
---|
1607 | #else
|
---|
1608 | pe = &isym->pltent;
|
---|
1609 | #endif
|
---|
1610 |
|
---|
1611 | if (! pe->inited) {
|
---|
1612 | ip = (unsigned long *) (ifile->plt->contents + pe->offset);
|
---|
1613 |
|
---|
1614 | /* generate some machine code */
|
---|
1615 |
|
---|
1616 | #if defined(__arm__)
|
---|
1617 | ip[0] = 0xe51ff004; /* ldr pc,[pc,#-4] */
|
---|
1618 | ip[1] = v; /* sym@ */
|
---|
1619 | #endif
|
---|
1620 | #if defined(__powerpc__)
|
---|
1621 | ip[0] = 0x3d600000 + ((v + 0x8000) >> 16); /* lis r11,sym@ha */
|
---|
1622 | ip[1] = 0x396b0000 + (v & 0xffff); /* addi r11,r11,sym@l */
|
---|
1623 | ip[2] = 0x7d6903a6; /* mtctr r11 */
|
---|
1624 | ip[3] = 0x4e800420; /* bctr */
|
---|
1625 | #endif
|
---|
1626 | #if defined(__v850e__)
|
---|
1627 | /* We have to trash a register, so we assume that any control
|
---|
1628 | transfer more than 21-bits away must be a function call
|
---|
1629 | (so we can use a call-clobbered register). */
|
---|
1630 | ip[0] = 0x0621 + ((v & 0xffff) << 16); /* mov sym, r1 ... */
|
---|
1631 | ip[1] = ((v >> 16) & 0xffff) + 0x610000; /* ...; jmp r1 */
|
---|
1632 | #endif
|
---|
1633 | pe->inited = 1;
|
---|
1634 | }
|
---|
1635 |
|
---|
1636 | /* relative distance to target */
|
---|
1637 | v -= dot;
|
---|
1638 | /* if the target is too far away.... */
|
---|
1639 | #if defined(__arm__) || defined(__powerpc__)
|
---|
1640 | if ((int)v < -0x02000000 || (int)v >= 0x02000000)
|
---|
1641 | #elif defined(__v850e__)
|
---|
1642 | if ((ElfW(Sword))v > 0x1fffff || (ElfW(Sword))v < (ElfW(Sword))-0x200000)
|
---|
1643 | #endif
|
---|
1644 | /* go via the plt */
|
---|
1645 | v = plt + pe->offset - dot;
|
---|
1646 |
|
---|
1647 | #if defined(__v850e__)
|
---|
1648 | if (v & 1)
|
---|
1649 | #else
|
---|
1650 | if (v & 3)
|
---|
1651 | #endif
|
---|
1652 | ret = obj_reloc_dangerous;
|
---|
1653 |
|
---|
1654 | /* merge the offset into the instruction. */
|
---|
1655 | #if defined(__arm__)
|
---|
1656 | /* Convert to words. */
|
---|
1657 | v >>= 2;
|
---|
1658 |
|
---|
1659 | *loc = (*loc & ~0x00ffffff) | ((v + *loc) & 0x00ffffff);
|
---|
1660 | #endif
|
---|
1661 | #if defined(__powerpc__)
|
---|
1662 | *loc = (*loc & ~0x03fffffc) | (v & 0x03fffffc);
|
---|
1663 | #endif
|
---|
1664 | #if defined(__v850e__)
|
---|
1665 | /* We write two shorts instead of a long because even 32-bit insns
|
---|
1666 | only need half-word alignment, but the 32-bit data write needs
|
---|
1667 | to be long-word aligned. */
|
---|
1668 | ((unsigned short *)loc)[0] =
|
---|
1669 | (*(unsigned short *)loc & 0xffc0) /* opcode + reg */
|
---|
1670 | | ((v >> 16) & 0x3f); /* offs high part */
|
---|
1671 | ((unsigned short *)loc)[1] =
|
---|
1672 | (v & 0xffff); /* offs low part */
|
---|
1673 | #endif
|
---|
1674 | break;
|
---|
1675 | #endif /* USE_PLT_ENTRIES */
|
---|
1676 |
|
---|
1677 | #if defined(USE_GOT_ENTRIES)
|
---|
1678 | bb_use_got:
|
---|
1679 |
|
---|
1680 | /* needs an entry in the .got: set it, once */
|
---|
1681 | if (!isym->gotent.inited) {
|
---|
1682 | isym->gotent.inited = 1;
|
---|
1683 | *(ElfW(Addr) *) (ifile->got->contents + isym->gotent.offset) = v;
|
---|
1684 | }
|
---|
1685 | /* make the reloc with_respect_to_.got */
|
---|
1686 | #if defined(__sh__)
|
---|
1687 | *loc += isym->gotent.offset + rel->r_addend;
|
---|
1688 | #elif defined(__i386__) || defined(__arm__) || defined(__mc68000__)
|
---|
1689 | *loc += isym->gotent.offset;
|
---|
1690 | #endif
|
---|
1691 | break;
|
---|
1692 |
|
---|
1693 | #endif /* USE_GOT_ENTRIES */
|
---|
1694 | }
|
---|
1695 |
|
---|
1696 | return ret;
|
---|
1697 | }
|
---|
1698 |
|
---|
1699 |
|
---|
1700 | #if defined(USE_LIST)
|
---|
1701 |
|
---|
1702 | static int arch_list_add(ElfW(RelM) *rel, struct arch_list_entry **list,
|
---|
1703 | int offset, int size)
|
---|
1704 | {
|
---|
1705 | struct arch_list_entry *pe;
|
---|
1706 |
|
---|
1707 | for (pe = *list; pe != NULL; pe = pe->next) {
|
---|
1708 | if (pe->addend == rel->r_addend) {
|
---|
1709 | break;
|
---|
1710 | }
|
---|
1711 | }
|
---|
1712 |
|
---|
1713 | if (pe == NULL) {
|
---|
1714 | pe = xzalloc(sizeof(struct arch_list_entry));
|
---|
1715 | pe->next = *list;
|
---|
1716 | pe->addend = rel->r_addend;
|
---|
1717 | pe->offset = offset;
|
---|
1718 | /*pe->inited = 0;*/
|
---|
1719 | *list = pe;
|
---|
1720 | return size;
|
---|
1721 | }
|
---|
1722 | return 0;
|
---|
1723 | }
|
---|
1724 |
|
---|
1725 | #endif
|
---|
1726 |
|
---|
1727 | #if defined(USE_SINGLE)
|
---|
1728 |
|
---|
1729 | static int arch_single_init(/*ElfW(RelM) *rel,*/ struct arch_single_entry *single,
|
---|
1730 | int offset, int size)
|
---|
1731 | {
|
---|
1732 | if (single->allocated == 0) {
|
---|
1733 | single->allocated = 1;
|
---|
1734 | single->offset = offset;
|
---|
1735 | single->inited = 0;
|
---|
1736 | return size;
|
---|
1737 | }
|
---|
1738 | return 0;
|
---|
1739 | }
|
---|
1740 |
|
---|
1741 | #endif
|
---|
1742 |
|
---|
1743 | #if defined(USE_GOT_ENTRIES) || defined(USE_PLT_ENTRIES)
|
---|
1744 |
|
---|
1745 | static struct obj_section *arch_xsect_init(struct obj_file *f, const char *name,
|
---|
1746 | int offset, int size)
|
---|
1747 | {
|
---|
1748 | struct obj_section *myrelsec = obj_find_section(f, name);
|
---|
1749 |
|
---|
1750 | if (offset == 0) {
|
---|
1751 | offset += size;
|
---|
1752 | }
|
---|
1753 |
|
---|
1754 | if (myrelsec) {
|
---|
1755 | obj_extend_section(myrelsec, offset);
|
---|
1756 | } else {
|
---|
1757 | myrelsec = obj_create_alloced_section(f, name,
|
---|
1758 | size, offset);
|
---|
1759 | }
|
---|
1760 |
|
---|
1761 | return myrelsec;
|
---|
1762 | }
|
---|
1763 |
|
---|
1764 | #endif
|
---|
1765 |
|
---|
1766 | static void arch_create_got(struct obj_file *f)
|
---|
1767 | {
|
---|
1768 | #if defined(USE_GOT_ENTRIES) || defined(USE_PLT_ENTRIES)
|
---|
1769 | struct arch_file *ifile = (struct arch_file *) f;
|
---|
1770 | int i;
|
---|
1771 | #if defined(USE_GOT_ENTRIES)
|
---|
1772 | int got_offset = 0, got_needed = 0, got_allocate;
|
---|
1773 | #endif
|
---|
1774 | #if defined(USE_PLT_ENTRIES)
|
---|
1775 | int plt_offset = 0, plt_needed = 0, plt_allocate;
|
---|
1776 | #endif
|
---|
1777 | struct obj_section *relsec, *symsec, *strsec;
|
---|
1778 | ElfW(RelM) *rel, *relend;
|
---|
1779 | ElfW(Sym) *symtab, *extsym;
|
---|
1780 | const char *strtab, *name;
|
---|
1781 | struct arch_symbol *intsym;
|
---|
1782 |
|
---|
1783 | for (i = 0; i < f->header.e_shnum; ++i) {
|
---|
1784 | relsec = f->sections[i];
|
---|
1785 | if (relsec->header.sh_type != SHT_RELM)
|
---|
1786 | continue;
|
---|
1787 |
|
---|
1788 | symsec = f->sections[relsec->header.sh_link];
|
---|
1789 | strsec = f->sections[symsec->header.sh_link];
|
---|
1790 |
|
---|
1791 | rel = (ElfW(RelM) *) relsec->contents;
|
---|
1792 | relend = rel + (relsec->header.sh_size / sizeof(ElfW(RelM)));
|
---|
1793 | symtab = (ElfW(Sym) *) symsec->contents;
|
---|
1794 | strtab = (const char *) strsec->contents;
|
---|
1795 |
|
---|
1796 | for (; rel < relend; ++rel) {
|
---|
1797 | extsym = &symtab[ELF_R_SYM(rel->r_info)];
|
---|
1798 |
|
---|
1799 | #if defined(USE_GOT_ENTRIES)
|
---|
1800 | got_allocate = 0;
|
---|
1801 | #endif
|
---|
1802 | #if defined(USE_PLT_ENTRIES)
|
---|
1803 | plt_allocate = 0;
|
---|
1804 | #endif
|
---|
1805 |
|
---|
1806 | switch (ELF_R_TYPE(rel->r_info)) {
|
---|
1807 | #if defined(__arm__)
|
---|
1808 | case R_ARM_PC24:
|
---|
1809 | case R_ARM_PLT32:
|
---|
1810 | plt_allocate = 1;
|
---|
1811 | break;
|
---|
1812 |
|
---|
1813 | case R_ARM_GOTOFF:
|
---|
1814 | case R_ARM_GOTPC:
|
---|
1815 | got_needed = 1;
|
---|
1816 | continue;
|
---|
1817 |
|
---|
1818 | case R_ARM_GOT32:
|
---|
1819 | got_allocate = 1;
|
---|
1820 | break;
|
---|
1821 |
|
---|
1822 | #elif defined(__i386__)
|
---|
1823 | case R_386_GOTPC:
|
---|
1824 | case R_386_GOTOFF:
|
---|
1825 | got_needed = 1;
|
---|
1826 | continue;
|
---|
1827 |
|
---|
1828 | case R_386_GOT32:
|
---|
1829 | got_allocate = 1;
|
---|
1830 | break;
|
---|
1831 |
|
---|
1832 | #elif defined(__powerpc__)
|
---|
1833 | case R_PPC_REL24:
|
---|
1834 | plt_allocate = 1;
|
---|
1835 | break;
|
---|
1836 |
|
---|
1837 | #elif defined(__mc68000__)
|
---|
1838 | case R_68K_GOT32:
|
---|
1839 | got_allocate = 1;
|
---|
1840 | break;
|
---|
1841 |
|
---|
1842 | #ifdef R_68K_GOTOFF
|
---|
1843 | case R_68K_GOTOFF:
|
---|
1844 | got_needed = 1;
|
---|
1845 | continue;
|
---|
1846 | #endif
|
---|
1847 |
|
---|
1848 | #elif defined(__sh__)
|
---|
1849 | case R_SH_GOT32:
|
---|
1850 | got_allocate = 1;
|
---|
1851 | break;
|
---|
1852 |
|
---|
1853 | case R_SH_GOTPC:
|
---|
1854 | case R_SH_GOTOFF:
|
---|
1855 | got_needed = 1;
|
---|
1856 | continue;
|
---|
1857 |
|
---|
1858 | #elif defined(__v850e__)
|
---|
1859 | case R_V850_22_PCREL:
|
---|
1860 | plt_needed = 1;
|
---|
1861 | break;
|
---|
1862 |
|
---|
1863 | #endif
|
---|
1864 | default:
|
---|
1865 | continue;
|
---|
1866 | }
|
---|
1867 |
|
---|
1868 | if (extsym->st_name != 0) {
|
---|
1869 | name = strtab + extsym->st_name;
|
---|
1870 | } else {
|
---|
1871 | name = f->sections[extsym->st_shndx]->name;
|
---|
1872 | }
|
---|
1873 | intsym = (struct arch_symbol *) obj_find_symbol(f, name);
|
---|
1874 | #if defined(USE_GOT_ENTRIES)
|
---|
1875 | if (got_allocate) {
|
---|
1876 | got_offset += arch_single_init(
|
---|
1877 | /*rel,*/ &intsym->gotent,
|
---|
1878 | got_offset, GOT_ENTRY_SIZE);
|
---|
1879 |
|
---|
1880 | got_needed = 1;
|
---|
1881 | }
|
---|
1882 | #endif
|
---|
1883 | #if defined(USE_PLT_ENTRIES)
|
---|
1884 | if (plt_allocate) {
|
---|
1885 | #if defined(USE_PLT_LIST)
|
---|
1886 | plt_offset += arch_list_add(
|
---|
1887 | rel, &intsym->pltent,
|
---|
1888 | plt_offset, PLT_ENTRY_SIZE);
|
---|
1889 | #else
|
---|
1890 | plt_offset += arch_single_init(
|
---|
1891 | /*rel,*/ &intsym->pltent,
|
---|
1892 | plt_offset, PLT_ENTRY_SIZE);
|
---|
1893 | #endif
|
---|
1894 | plt_needed = 1;
|
---|
1895 | }
|
---|
1896 | #endif
|
---|
1897 | }
|
---|
1898 | }
|
---|
1899 |
|
---|
1900 | #if defined(USE_GOT_ENTRIES)
|
---|
1901 | if (got_needed) {
|
---|
1902 | ifile->got = arch_xsect_init(f, ".got", got_offset,
|
---|
1903 | GOT_ENTRY_SIZE);
|
---|
1904 | }
|
---|
1905 | #endif
|
---|
1906 |
|
---|
1907 | #if defined(USE_PLT_ENTRIES)
|
---|
1908 | if (plt_needed) {
|
---|
1909 | ifile->plt = arch_xsect_init(f, ".plt", plt_offset,
|
---|
1910 | PLT_ENTRY_SIZE);
|
---|
1911 | }
|
---|
1912 | #endif
|
---|
1913 |
|
---|
1914 | #endif /* defined(USE_GOT_ENTRIES) || defined(USE_PLT_ENTRIES) */
|
---|
1915 | }
|
---|
1916 |
|
---|
1917 | /*======================================================================*/
|
---|
1918 |
|
---|
1919 | /* Standard ELF hash function. */
|
---|
1920 | static unsigned long obj_elf_hash_n(const char *name, unsigned long n)
|
---|
1921 | {
|
---|
1922 | unsigned long h = 0;
|
---|
1923 | unsigned long g;
|
---|
1924 | unsigned char ch;
|
---|
1925 |
|
---|
1926 | while (n > 0) {
|
---|
1927 | ch = *name++;
|
---|
1928 | h = (h << 4) + ch;
|
---|
1929 | g = (h & 0xf0000000);
|
---|
1930 | if (g != 0) {
|
---|
1931 | h ^= g >> 24;
|
---|
1932 | h &= ~g;
|
---|
1933 | }
|
---|
1934 | n--;
|
---|
1935 | }
|
---|
1936 | return h;
|
---|
1937 | }
|
---|
1938 |
|
---|
1939 | static unsigned long FAST_FUNC obj_elf_hash(const char *name)
|
---|
1940 | {
|
---|
1941 | return obj_elf_hash_n(name, strlen(name));
|
---|
1942 | }
|
---|
1943 |
|
---|
1944 | #if ENABLE_FEATURE_INSMOD_VERSION_CHECKING
|
---|
1945 | /* String comparison for non-co-versioned kernel and module. */
|
---|
1946 |
|
---|
1947 | static int ncv_strcmp(const char *a, const char *b)
|
---|
1948 | {
|
---|
1949 | size_t alen = strlen(a), blen = strlen(b);
|
---|
1950 |
|
---|
1951 | if (blen == alen + 10 && b[alen] == '_' && b[alen + 1] == 'R')
|
---|
1952 | return strncmp(a, b, alen);
|
---|
1953 | else if (alen == blen + 10 && a[blen] == '_' && a[blen + 1] == 'R')
|
---|
1954 | return strncmp(a, b, blen);
|
---|
1955 | else
|
---|
1956 | return strcmp(a, b);
|
---|
1957 | }
|
---|
1958 |
|
---|
1959 | /* String hashing for non-co-versioned kernel and module. Here
|
---|
1960 | we are simply forced to drop the crc from the hash. */
|
---|
1961 |
|
---|
1962 | static unsigned long FAST_FUNC ncv_symbol_hash(const char *str)
|
---|
1963 | {
|
---|
1964 | size_t len = strlen(str);
|
---|
1965 | if (len > 10 && str[len - 10] == '_' && str[len - 9] == 'R')
|
---|
1966 | len -= 10;
|
---|
1967 | return obj_elf_hash_n(str, len);
|
---|
1968 | }
|
---|
1969 |
|
---|
1970 | static void
|
---|
1971 | obj_set_symbol_compare(struct obj_file *f,
|
---|
1972 | int (*cmp) (const char *, const char *),
|
---|
1973 | unsigned long (*hash) (const char *) FAST_FUNC)
|
---|
1974 | {
|
---|
1975 | if (cmp)
|
---|
1976 | f->symbol_cmp = cmp;
|
---|
1977 | if (hash) {
|
---|
1978 | struct obj_symbol *tmptab[HASH_BUCKETS], *sym, *next;
|
---|
1979 | int i;
|
---|
1980 |
|
---|
1981 | f->symbol_hash = hash;
|
---|
1982 |
|
---|
1983 | memcpy(tmptab, f->symtab, sizeof(tmptab));
|
---|
1984 | memset(f->symtab, 0, sizeof(f->symtab));
|
---|
1985 |
|
---|
1986 | for (i = 0; i < HASH_BUCKETS; ++i) {
|
---|
1987 | for (sym = tmptab[i]; sym; sym = next) {
|
---|
1988 | unsigned long h = hash(sym->name) % HASH_BUCKETS;
|
---|
1989 | next = sym->next;
|
---|
1990 | sym->next = f->symtab[h];
|
---|
1991 | f->symtab[h] = sym;
|
---|
1992 | }
|
---|
1993 | }
|
---|
1994 | }
|
---|
1995 | }
|
---|
1996 |
|
---|
1997 | #endif /* FEATURE_INSMOD_VERSION_CHECKING */
|
---|
1998 |
|
---|
1999 | static struct obj_symbol *
|
---|
2000 | obj_add_symbol(struct obj_file *f, const char *name,
|
---|
2001 | unsigned long symidx, int info,
|
---|
2002 | int secidx, ElfW(Addr) value,
|
---|
2003 | unsigned long size)
|
---|
2004 | {
|
---|
2005 | struct obj_symbol *sym;
|
---|
2006 | unsigned long hash = f->symbol_hash(name) % HASH_BUCKETS;
|
---|
2007 | int n_type = ELF_ST_TYPE(info);
|
---|
2008 | int n_binding = ELF_ST_BIND(info);
|
---|
2009 |
|
---|
2010 | for (sym = f->symtab[hash]; sym; sym = sym->next) {
|
---|
2011 | if (f->symbol_cmp(sym->name, name) == 0) {
|
---|
2012 | int o_secidx = sym->secidx;
|
---|
2013 | int o_info = sym->info;
|
---|
2014 | int o_type = ELF_ST_TYPE(o_info);
|
---|
2015 | int o_binding = ELF_ST_BIND(o_info);
|
---|
2016 |
|
---|
2017 | /* A redefinition! Is it legal? */
|
---|
2018 |
|
---|
2019 | if (secidx == SHN_UNDEF)
|
---|
2020 | return sym;
|
---|
2021 | else if (o_secidx == SHN_UNDEF)
|
---|
2022 | goto found;
|
---|
2023 | else if (n_binding == STB_GLOBAL && o_binding == STB_LOCAL) {
|
---|
2024 | /* Cope with local and global symbols of the same name
|
---|
2025 | in the same object file, as might have been created
|
---|
2026 | by ld -r. The only reason locals are now seen at this
|
---|
2027 | level at all is so that we can do semi-sensible things
|
---|
2028 | with parameters. */
|
---|
2029 |
|
---|
2030 | struct obj_symbol *nsym, **p;
|
---|
2031 |
|
---|
2032 | nsym = arch_new_symbol();
|
---|
2033 | nsym->next = sym->next;
|
---|
2034 | nsym->ksymidx = -1;
|
---|
2035 |
|
---|
2036 | /* Excise the old (local) symbol from the hash chain. */
|
---|
2037 | for (p = &f->symtab[hash]; *p != sym; p = &(*p)->next)
|
---|
2038 | continue;
|
---|
2039 | *p = sym = nsym;
|
---|
2040 | goto found;
|
---|
2041 | } else if (n_binding == STB_LOCAL) {
|
---|
2042 | /* Another symbol of the same name has already been defined.
|
---|
2043 | Just add this to the local table. */
|
---|
2044 | sym = arch_new_symbol();
|
---|
2045 | sym->next = NULL;
|
---|
2046 | sym->ksymidx = -1;
|
---|
2047 | f->local_symtab[symidx] = sym;
|
---|
2048 | goto found;
|
---|
2049 | } else if (n_binding == STB_WEAK)
|
---|
2050 | return sym;
|
---|
2051 | else if (o_binding == STB_WEAK)
|
---|
2052 | goto found;
|
---|
2053 | /* Don't unify COMMON symbols with object types the programmer
|
---|
2054 | doesn't expect. */
|
---|
2055 | else if (secidx == SHN_COMMON
|
---|
2056 | && (o_type == STT_NOTYPE || o_type == STT_OBJECT))
|
---|
2057 | return sym;
|
---|
2058 | else if (o_secidx == SHN_COMMON
|
---|
2059 | && (n_type == STT_NOTYPE || n_type == STT_OBJECT))
|
---|
2060 | goto found;
|
---|
2061 | else {
|
---|
2062 | /* Don't report an error if the symbol is coming from
|
---|
2063 | the kernel or some external module. */
|
---|
2064 | if (secidx <= SHN_HIRESERVE)
|
---|
2065 | bb_error_msg("%s multiply defined", name);
|
---|
2066 | return sym;
|
---|
2067 | }
|
---|
2068 | }
|
---|
2069 | }
|
---|
2070 |
|
---|
2071 | /* Completely new symbol. */
|
---|
2072 | sym = arch_new_symbol();
|
---|
2073 | sym->next = f->symtab[hash];
|
---|
2074 | f->symtab[hash] = sym;
|
---|
2075 | sym->ksymidx = -1;
|
---|
2076 | if (ELF_ST_BIND(info) == STB_LOCAL && symidx != (unsigned long)(-1)) {
|
---|
2077 | if (symidx >= f->local_symtab_size)
|
---|
2078 | bb_error_msg("local symbol %s with index %ld exceeds local_symtab_size %ld",
|
---|
2079 | name, (long) symidx, (long) f->local_symtab_size);
|
---|
2080 | else
|
---|
2081 | f->local_symtab[symidx] = sym;
|
---|
2082 | }
|
---|
2083 |
|
---|
2084 | found:
|
---|
2085 | sym->name = name;
|
---|
2086 | sym->value = value;
|
---|
2087 | sym->size = size;
|
---|
2088 | sym->secidx = secidx;
|
---|
2089 | sym->info = info;
|
---|
2090 |
|
---|
2091 | return sym;
|
---|
2092 | }
|
---|
2093 |
|
---|
2094 | static struct obj_symbol *
|
---|
2095 | obj_find_symbol(struct obj_file *f, const char *name)
|
---|
2096 | {
|
---|
2097 | struct obj_symbol *sym;
|
---|
2098 | unsigned long hash = f->symbol_hash(name) % HASH_BUCKETS;
|
---|
2099 |
|
---|
2100 | for (sym = f->symtab[hash]; sym; sym = sym->next)
|
---|
2101 | if (f->symbol_cmp(sym->name, name) == 0)
|
---|
2102 | return sym;
|
---|
2103 | return NULL;
|
---|
2104 | }
|
---|
2105 |
|
---|
2106 | static ElfW(Addr) obj_symbol_final_value(struct obj_file * f, struct obj_symbol * sym)
|
---|
2107 | {
|
---|
2108 | if (sym) {
|
---|
2109 | if (sym->secidx >= SHN_LORESERVE)
|
---|
2110 | return sym->value;
|
---|
2111 | return sym->value + f->sections[sym->secidx]->header.sh_addr;
|
---|
2112 | }
|
---|
2113 | /* As a special case, a NULL sym has value zero. */
|
---|
2114 | return 0;
|
---|
2115 | }
|
---|
2116 |
|
---|
2117 | static struct obj_section *obj_find_section(struct obj_file *f, const char *name)
|
---|
2118 | {
|
---|
2119 | int i, n = f->header.e_shnum;
|
---|
2120 |
|
---|
2121 | for (i = 0; i < n; ++i)
|
---|
2122 | if (strcmp(f->sections[i]->name, name) == 0)
|
---|
2123 | return f->sections[i];
|
---|
2124 | return NULL;
|
---|
2125 | }
|
---|
2126 |
|
---|
2127 | static int obj_load_order_prio(struct obj_section *a)
|
---|
2128 | {
|
---|
2129 | unsigned long af, ac;
|
---|
2130 |
|
---|
2131 | af = a->header.sh_flags;
|
---|
2132 |
|
---|
2133 | ac = 0;
|
---|
2134 | if (a->name[0] != '.' || strlen(a->name) != 10
|
---|
2135 | || strcmp(a->name + 5, ".init") != 0
|
---|
2136 | ) {
|
---|
2137 | ac |= 32;
|
---|
2138 | }
|
---|
2139 | if (af & SHF_ALLOC)
|
---|
2140 | ac |= 16;
|
---|
2141 | if (!(af & SHF_WRITE))
|
---|
2142 | ac |= 8;
|
---|
2143 | if (af & SHF_EXECINSTR)
|
---|
2144 | ac |= 4;
|
---|
2145 | if (a->header.sh_type != SHT_NOBITS)
|
---|
2146 | ac |= 2;
|
---|
2147 |
|
---|
2148 | return ac;
|
---|
2149 | }
|
---|
2150 |
|
---|
2151 | static void
|
---|
2152 | obj_insert_section_load_order(struct obj_file *f, struct obj_section *sec)
|
---|
2153 | {
|
---|
2154 | struct obj_section **p;
|
---|
2155 | int prio = obj_load_order_prio(sec);
|
---|
2156 | for (p = f->load_order_search_start; *p; p = &(*p)->load_next)
|
---|
2157 | if (obj_load_order_prio(*p) < prio)
|
---|
2158 | break;
|
---|
2159 | sec->load_next = *p;
|
---|
2160 | *p = sec;
|
---|
2161 | }
|
---|
2162 |
|
---|
2163 | static struct obj_section *helper_create_alloced_section(struct obj_file *f,
|
---|
2164 | const char *name,
|
---|
2165 | unsigned long align,
|
---|
2166 | unsigned long size)
|
---|
2167 | {
|
---|
2168 | int newidx = f->header.e_shnum++;
|
---|
2169 | struct obj_section *sec;
|
---|
2170 |
|
---|
2171 | f->sections = xrealloc_vector(f->sections, 2, newidx);
|
---|
2172 | f->sections[newidx] = sec = arch_new_section();
|
---|
2173 |
|
---|
2174 | sec->header.sh_type = SHT_PROGBITS;
|
---|
2175 | sec->header.sh_flags = SHF_WRITE | SHF_ALLOC;
|
---|
2176 | sec->header.sh_size = size;
|
---|
2177 | sec->header.sh_addralign = align;
|
---|
2178 | sec->name = name;
|
---|
2179 | sec->idx = newidx;
|
---|
2180 | if (size)
|
---|
2181 | sec->contents = xzalloc(size);
|
---|
2182 |
|
---|
2183 | return sec;
|
---|
2184 | }
|
---|
2185 |
|
---|
2186 | static struct obj_section *obj_create_alloced_section(struct obj_file *f,
|
---|
2187 | const char *name,
|
---|
2188 | unsigned long align,
|
---|
2189 | unsigned long size)
|
---|
2190 | {
|
---|
2191 | struct obj_section *sec;
|
---|
2192 |
|
---|
2193 | sec = helper_create_alloced_section(f, name, align, size);
|
---|
2194 | obj_insert_section_load_order(f, sec);
|
---|
2195 | return sec;
|
---|
2196 | }
|
---|
2197 |
|
---|
2198 | static struct obj_section *obj_create_alloced_section_first(struct obj_file *f,
|
---|
2199 | const char *name,
|
---|
2200 | unsigned long align,
|
---|
2201 | unsigned long size)
|
---|
2202 | {
|
---|
2203 | struct obj_section *sec;
|
---|
2204 |
|
---|
2205 | sec = helper_create_alloced_section(f, name, align, size);
|
---|
2206 | sec->load_next = f->load_order;
|
---|
2207 | f->load_order = sec;
|
---|
2208 | if (f->load_order_search_start == &f->load_order)
|
---|
2209 | f->load_order_search_start = &sec->load_next;
|
---|
2210 |
|
---|
2211 | return sec;
|
---|
2212 | }
|
---|
2213 |
|
---|
2214 | static void *obj_extend_section(struct obj_section *sec, unsigned long more)
|
---|
2215 | {
|
---|
2216 | unsigned long oldsize = sec->header.sh_size;
|
---|
2217 | if (more) {
|
---|
2218 | sec->header.sh_size += more;
|
---|
2219 | sec->contents = xrealloc(sec->contents, sec->header.sh_size);
|
---|
2220 | }
|
---|
2221 | return sec->contents + oldsize;
|
---|
2222 | }
|
---|
2223 |
|
---|
2224 |
|
---|
2225 | /* Conditionally add the symbols from the given symbol set to the
|
---|
2226 | new module. */
|
---|
2227 |
|
---|
2228 | static int add_symbols_from(struct obj_file *f,
|
---|
2229 | int idx,
|
---|
2230 | struct new_module_symbol *syms,
|
---|
2231 | size_t nsyms)
|
---|
2232 | {
|
---|
2233 | struct new_module_symbol *s;
|
---|
2234 | size_t i;
|
---|
2235 | int used = 0;
|
---|
2236 | #ifdef SYMBOL_PREFIX
|
---|
2237 | char *name_buf = NULL;
|
---|
2238 | size_t name_alloced_size = 0;
|
---|
2239 | #endif
|
---|
2240 | #if ENABLE_FEATURE_CHECK_TAINTED_MODULE
|
---|
2241 | int gpl;
|
---|
2242 |
|
---|
2243 | gpl = obj_gpl_license(f, NULL) == 0;
|
---|
2244 | #endif
|
---|
2245 | for (i = 0, s = syms; i < nsyms; ++i, ++s) {
|
---|
2246 | /* Only add symbols that are already marked external.
|
---|
2247 | If we override locals we may cause problems for
|
---|
2248 | argument initialization. We will also create a false
|
---|
2249 | dependency on the module. */
|
---|
2250 | struct obj_symbol *sym;
|
---|
2251 | char *name;
|
---|
2252 |
|
---|
2253 | /* GPL licensed modules can use symbols exported with
|
---|
2254 | * EXPORT_SYMBOL_GPL, so ignore any GPLONLY_ prefix on the
|
---|
2255 | * exported names. Non-GPL modules never see any GPLONLY_
|
---|
2256 | * symbols so they cannot fudge it by adding the prefix on
|
---|
2257 | * their references.
|
---|
2258 | */
|
---|
2259 | if (strncmp((char *)s->name, "GPLONLY_", 8) == 0) {
|
---|
2260 | #if ENABLE_FEATURE_CHECK_TAINTED_MODULE
|
---|
2261 | if (gpl)
|
---|
2262 | s->name += 8;
|
---|
2263 | else
|
---|
2264 | #endif
|
---|
2265 | continue;
|
---|
2266 | }
|
---|
2267 | name = (char *)s->name;
|
---|
2268 |
|
---|
2269 | #ifdef SYMBOL_PREFIX
|
---|
2270 | /* Prepend SYMBOL_PREFIX to the symbol's name (the
|
---|
2271 | kernel exports `C names', but module object files
|
---|
2272 | reference `linker names'). */
|
---|
2273 | size_t extra = sizeof SYMBOL_PREFIX;
|
---|
2274 | size_t name_size = strlen(name) + extra;
|
---|
2275 | if (name_size > name_alloced_size) {
|
---|
2276 | name_alloced_size = name_size * 2;
|
---|
2277 | name_buf = alloca(name_alloced_size);
|
---|
2278 | }
|
---|
2279 | strcpy(name_buf, SYMBOL_PREFIX);
|
---|
2280 | strcpy(name_buf + extra - 1, name);
|
---|
2281 | name = name_buf;
|
---|
2282 | #endif
|
---|
2283 |
|
---|
2284 | sym = obj_find_symbol(f, name);
|
---|
2285 | if (sym && !(ELF_ST_BIND(sym->info) == STB_LOCAL)) {
|
---|
2286 | #ifdef SYMBOL_PREFIX
|
---|
2287 | /* Put NAME_BUF into more permanent storage. */
|
---|
2288 | name = xmalloc(name_size);
|
---|
2289 | strcpy(name, name_buf);
|
---|
2290 | #endif
|
---|
2291 | sym = obj_add_symbol(f, name, -1,
|
---|
2292 | ELF_ST_INFO(STB_GLOBAL,
|
---|
2293 | STT_NOTYPE),
|
---|
2294 | idx, s->value, 0);
|
---|
2295 | /* Did our symbol just get installed? If so, mark the
|
---|
2296 | module as "used". */
|
---|
2297 | if (sym->secidx == idx)
|
---|
2298 | used = 1;
|
---|
2299 | }
|
---|
2300 | }
|
---|
2301 |
|
---|
2302 | return used;
|
---|
2303 | }
|
---|
2304 |
|
---|
2305 | static void add_kernel_symbols(struct obj_file *f)
|
---|
2306 | {
|
---|
2307 | struct external_module *m;
|
---|
2308 | int i, nused = 0;
|
---|
2309 |
|
---|
2310 | /* Add module symbols first. */
|
---|
2311 |
|
---|
2312 | for (i = 0, m = ext_modules; i < n_ext_modules; ++i, ++m) {
|
---|
2313 | if (m->nsyms
|
---|
2314 | && add_symbols_from(f, SHN_HIRESERVE + 2 + i, m->syms, m->nsyms)
|
---|
2315 | ) {
|
---|
2316 | m->used = 1;
|
---|
2317 | ++nused;
|
---|
2318 | }
|
---|
2319 | }
|
---|
2320 |
|
---|
2321 | n_ext_modules_used = nused;
|
---|
2322 |
|
---|
2323 | /* And finally the symbols from the kernel proper. */
|
---|
2324 |
|
---|
2325 | if (nksyms)
|
---|
2326 | add_symbols_from(f, SHN_HIRESERVE + 1, ksyms, nksyms);
|
---|
2327 | }
|
---|
2328 |
|
---|
2329 | static char *get_modinfo_value(struct obj_file *f, const char *key)
|
---|
2330 | {
|
---|
2331 | struct obj_section *sec;
|
---|
2332 | char *p, *v, *n, *ep;
|
---|
2333 | size_t klen = strlen(key);
|
---|
2334 |
|
---|
2335 | sec = obj_find_section(f, ".modinfo");
|
---|
2336 | if (sec == NULL)
|
---|
2337 | return NULL;
|
---|
2338 | p = sec->contents;
|
---|
2339 | ep = p + sec->header.sh_size;
|
---|
2340 | while (p < ep) {
|
---|
2341 | v = strchr(p, '=');
|
---|
2342 | n = strchr(p, '\0');
|
---|
2343 | if (v) {
|
---|
2344 | if (p + klen == v && strncmp(p, key, klen) == 0)
|
---|
2345 | return v + 1;
|
---|
2346 | } else {
|
---|
2347 | if (p + klen == n && strcmp(p, key) == 0)
|
---|
2348 | return n;
|
---|
2349 | }
|
---|
2350 | p = n + 1;
|
---|
2351 | }
|
---|
2352 |
|
---|
2353 | return NULL;
|
---|
2354 | }
|
---|
2355 |
|
---|
2356 |
|
---|
2357 | /*======================================================================*/
|
---|
2358 | /* Functions relating to module loading after 2.1.18. */
|
---|
2359 |
|
---|
2360 | /* From Linux-2.6 sources */
|
---|
2361 | /* You can use " around spaces, but can't escape ". */
|
---|
2362 | /* Hyphens and underscores equivalent in parameter names. */
|
---|
2363 | static char *next_arg(char *args, char **param, char **val)
|
---|
2364 | {
|
---|
2365 | unsigned int i, equals = 0;
|
---|
2366 | int in_quote = 0, quoted = 0;
|
---|
2367 | char *next;
|
---|
2368 |
|
---|
2369 | if (*args == '"') {
|
---|
2370 | args++;
|
---|
2371 | in_quote = 1;
|
---|
2372 | quoted = 1;
|
---|
2373 | }
|
---|
2374 |
|
---|
2375 | for (i = 0; args[i]; i++) {
|
---|
2376 | if (args[i] == ' ' && !in_quote)
|
---|
2377 | break;
|
---|
2378 | if (equals == 0) {
|
---|
2379 | if (args[i] == '=')
|
---|
2380 | equals = i;
|
---|
2381 | }
|
---|
2382 | if (args[i] == '"')
|
---|
2383 | in_quote = !in_quote;
|
---|
2384 | }
|
---|
2385 |
|
---|
2386 | *param = args;
|
---|
2387 | if (!equals)
|
---|
2388 | *val = NULL;
|
---|
2389 | else {
|
---|
2390 | args[equals] = '\0';
|
---|
2391 | *val = args + equals + 1;
|
---|
2392 |
|
---|
2393 | /* Don't include quotes in value. */
|
---|
2394 | if (**val == '"') {
|
---|
2395 | (*val)++;
|
---|
2396 | if (args[i-1] == '"')
|
---|
2397 | args[i-1] = '\0';
|
---|
2398 | }
|
---|
2399 | if (quoted && args[i-1] == '"')
|
---|
2400 | args[i-1] = '\0';
|
---|
2401 | }
|
---|
2402 |
|
---|
2403 | if (args[i]) {
|
---|
2404 | args[i] = '\0';
|
---|
2405 | next = args + i + 1;
|
---|
2406 | } else
|
---|
2407 | next = args + i;
|
---|
2408 |
|
---|
2409 | /* Chew up trailing spaces. */
|
---|
2410 | return skip_whitespace(next);
|
---|
2411 | }
|
---|
2412 |
|
---|
2413 | static void
|
---|
2414 | new_process_module_arguments(struct obj_file *f, const char *options)
|
---|
2415 | {
|
---|
2416 | char *xoptions, *pos;
|
---|
2417 | char *param, *val;
|
---|
2418 |
|
---|
2419 | xoptions = pos = xstrdup(skip_whitespace(options));
|
---|
2420 | while (*pos) {
|
---|
2421 | unsigned long charssize = 0;
|
---|
2422 | char *tmp, *contents, *loc, *pinfo, *p;
|
---|
2423 | struct obj_symbol *sym;
|
---|
2424 | int min, max, n, len;
|
---|
2425 |
|
---|
2426 | pos = next_arg(pos, ¶m, &val);
|
---|
2427 |
|
---|
2428 | tmp = xasprintf("parm_%s", param);
|
---|
2429 | pinfo = get_modinfo_value(f, tmp);
|
---|
2430 | free(tmp);
|
---|
2431 | if (pinfo == NULL)
|
---|
2432 | bb_error_msg_and_die("invalid parameter %s", param);
|
---|
2433 |
|
---|
2434 | #ifdef SYMBOL_PREFIX
|
---|
2435 | tmp = xasprintf(SYMBOL_PREFIX "%s", param);
|
---|
2436 | sym = obj_find_symbol(f, tmp);
|
---|
2437 | free(tmp);
|
---|
2438 | #else
|
---|
2439 | sym = obj_find_symbol(f, param);
|
---|
2440 | #endif
|
---|
2441 |
|
---|
2442 | /* Also check that the parameter was not resolved from the kernel. */
|
---|
2443 | if (sym == NULL || sym->secidx > SHN_HIRESERVE)
|
---|
2444 | bb_error_msg_and_die("symbol for parameter %s not found", param);
|
---|
2445 |
|
---|
2446 | /* Number of parameters */
|
---|
2447 | if (isdigit(*pinfo)) {
|
---|
2448 | min = strtoul(pinfo, &pinfo, 10);
|
---|
2449 | if (*pinfo == '-')
|
---|
2450 | max = strtoul(pinfo + 1, &pinfo, 10);
|
---|
2451 | else
|
---|
2452 | max = min;
|
---|
2453 | } else
|
---|
2454 | min = max = 1;
|
---|
2455 |
|
---|
2456 | contents = f->sections[sym->secidx]->contents;
|
---|
2457 | loc = contents + sym->value;
|
---|
2458 |
|
---|
2459 | if (*pinfo == 'c') {
|
---|
2460 | if (!isdigit(pinfo[1])) {
|
---|
2461 | bb_error_msg_and_die("parameter type 'c' for %s must be followed by"
|
---|
2462 | " the maximum size", param);
|
---|
2463 | }
|
---|
2464 | charssize = strtoul(pinfo + 1, NULL, 10);
|
---|
2465 | }
|
---|
2466 |
|
---|
2467 | if (val == NULL) {
|
---|
2468 | if (*pinfo != 'b')
|
---|
2469 | bb_error_msg_and_die("argument expected for parameter %s", param);
|
---|
2470 | val = (char *) "1";
|
---|
2471 | }
|
---|
2472 |
|
---|
2473 | /* Parse parameter values */
|
---|
2474 | n = 0;
|
---|
2475 | p = val;
|
---|
2476 | while (*p != 0) {
|
---|
2477 | char sv_ch;
|
---|
2478 | char *endp;
|
---|
2479 |
|
---|
2480 | if (++n > max)
|
---|
2481 | bb_error_msg_and_die("too many values for %s (max %d)", param, max);
|
---|
2482 |
|
---|
2483 | switch (*pinfo) {
|
---|
2484 | case 's':
|
---|
2485 | len = strcspn(p, ",");
|
---|
2486 | sv_ch = p[len];
|
---|
2487 | p[len] = 0;
|
---|
2488 | obj_string_patch(f, sym->secidx,
|
---|
2489 | loc - contents, p);
|
---|
2490 | loc += tgt_sizeof_char_p;
|
---|
2491 | p += len;
|
---|
2492 | *p = sv_ch;
|
---|
2493 | break;
|
---|
2494 | case 'c':
|
---|
2495 | len = strcspn(p, ",");
|
---|
2496 | sv_ch = p[len];
|
---|
2497 | p[len] = 0;
|
---|
2498 | if (len >= charssize)
|
---|
2499 | bb_error_msg_and_die("string too long for %s (max %ld)", param,
|
---|
2500 | charssize - 1);
|
---|
2501 | strcpy((char *) loc, p);
|
---|
2502 | loc += charssize;
|
---|
2503 | p += len;
|
---|
2504 | *p = sv_ch;
|
---|
2505 | break;
|
---|
2506 | case 'b':
|
---|
2507 | *loc++ = strtoul(p, &endp, 0);
|
---|
2508 | p = endp; /* gcc likes temp var for &endp */
|
---|
2509 | break;
|
---|
2510 | case 'h':
|
---|
2511 | *(short *) loc = strtoul(p, &endp, 0);
|
---|
2512 | loc += tgt_sizeof_short;
|
---|
2513 | p = endp;
|
---|
2514 | break;
|
---|
2515 | case 'i':
|
---|
2516 | *(int *) loc = strtoul(p, &endp, 0);
|
---|
2517 | loc += tgt_sizeof_int;
|
---|
2518 | p = endp;
|
---|
2519 | break;
|
---|
2520 | case 'l':
|
---|
2521 | *(long *) loc = strtoul(p, &endp, 0);
|
---|
2522 | loc += tgt_sizeof_long;
|
---|
2523 | p = endp;
|
---|
2524 | break;
|
---|
2525 | default:
|
---|
2526 | bb_error_msg_and_die("unknown parameter type '%c' for %s",
|
---|
2527 | *pinfo, param);
|
---|
2528 | }
|
---|
2529 |
|
---|
2530 | p = skip_whitespace(p);
|
---|
2531 | if (*p != ',')
|
---|
2532 | break;
|
---|
2533 | p = skip_whitespace(p + 1);
|
---|
2534 | }
|
---|
2535 |
|
---|
2536 | if (n < min)
|
---|
2537 | bb_error_msg_and_die("parameter %s requires at least %d arguments", param, min);
|
---|
2538 | if (*p != '\0')
|
---|
2539 | bb_error_msg_and_die("invalid argument syntax for %s", param);
|
---|
2540 | }
|
---|
2541 |
|
---|
2542 | free(xoptions);
|
---|
2543 | }
|
---|
2544 |
|
---|
2545 | #if ENABLE_FEATURE_INSMOD_VERSION_CHECKING
|
---|
2546 | static int new_is_module_checksummed(struct obj_file *f)
|
---|
2547 | {
|
---|
2548 | const char *p = get_modinfo_value(f, "using_checksums");
|
---|
2549 | if (p)
|
---|
2550 | return xatoi(p);
|
---|
2551 | return 0;
|
---|
2552 | }
|
---|
2553 |
|
---|
2554 | /* Get the module's kernel version in the canonical integer form. */
|
---|
2555 |
|
---|
2556 | static int
|
---|
2557 | new_get_module_version(struct obj_file *f, char str[STRVERSIONLEN])
|
---|
2558 | {
|
---|
2559 | char *p, *q;
|
---|
2560 | int a, b, c;
|
---|
2561 |
|
---|
2562 | p = get_modinfo_value(f, "kernel_version");
|
---|
2563 | if (p == NULL)
|
---|
2564 | return -1;
|
---|
2565 | safe_strncpy(str, p, STRVERSIONLEN);
|
---|
2566 |
|
---|
2567 | a = strtoul(p, &p, 10);
|
---|
2568 | if (*p != '.')
|
---|
2569 | return -1;
|
---|
2570 | b = strtoul(p + 1, &p, 10);
|
---|
2571 | if (*p != '.')
|
---|
2572 | return -1;
|
---|
2573 | c = strtoul(p + 1, &q, 10);
|
---|
2574 | if (p + 1 == q)
|
---|
2575 | return -1;
|
---|
2576 |
|
---|
2577 | return a << 16 | b << 8 | c;
|
---|
2578 | }
|
---|
2579 |
|
---|
2580 | #endif /* FEATURE_INSMOD_VERSION_CHECKING */
|
---|
2581 |
|
---|
2582 |
|
---|
2583 | /* Fetch the loaded modules, and all currently exported symbols. */
|
---|
2584 |
|
---|
2585 | static void new_get_kernel_symbols(void)
|
---|
2586 | {
|
---|
2587 | char *module_names, *mn;
|
---|
2588 | struct external_module *modules, *m;
|
---|
2589 | struct new_module_symbol *syms, *s;
|
---|
2590 | size_t ret, bufsize, nmod, nsyms, i, j;
|
---|
2591 |
|
---|
2592 | /* Collect the loaded modules. */
|
---|
2593 |
|
---|
2594 | bufsize = 256;
|
---|
2595 | module_names = xmalloc(bufsize);
|
---|
2596 |
|
---|
2597 | retry_modules_load:
|
---|
2598 | if (query_module(NULL, QM_MODULES, module_names, bufsize, &ret)) {
|
---|
2599 | if (errno == ENOSPC && bufsize < ret) {
|
---|
2600 | bufsize = ret;
|
---|
2601 | module_names = xrealloc(module_names, bufsize);
|
---|
2602 | goto retry_modules_load;
|
---|
2603 | }
|
---|
2604 | bb_perror_msg_and_die("QM_MODULES");
|
---|
2605 | }
|
---|
2606 |
|
---|
2607 | n_ext_modules = nmod = ret;
|
---|
2608 |
|
---|
2609 | /* Collect the modules' symbols. */
|
---|
2610 |
|
---|
2611 | if (nmod) {
|
---|
2612 | ext_modules = modules = xzalloc(nmod * sizeof(*modules));
|
---|
2613 | for (i = 0, mn = module_names, m = modules;
|
---|
2614 | i < nmod; ++i, ++m, mn += strlen(mn) + 1) {
|
---|
2615 | struct new_module_info info;
|
---|
2616 |
|
---|
2617 | if (query_module(mn, QM_INFO, &info, sizeof(info), &ret)) {
|
---|
2618 | if (errno == ENOENT) {
|
---|
2619 | /* The module was removed out from underneath us. */
|
---|
2620 | continue;
|
---|
2621 | }
|
---|
2622 | bb_perror_msg_and_die("query_module: QM_INFO: %s", mn);
|
---|
2623 | }
|
---|
2624 |
|
---|
2625 | bufsize = 1024;
|
---|
2626 | syms = xmalloc(bufsize);
|
---|
2627 | retry_mod_sym_load:
|
---|
2628 | if (query_module(mn, QM_SYMBOLS, syms, bufsize, &ret)) {
|
---|
2629 | switch (errno) {
|
---|
2630 | case ENOSPC:
|
---|
2631 | bufsize = ret;
|
---|
2632 | syms = xrealloc(syms, bufsize);
|
---|
2633 | goto retry_mod_sym_load;
|
---|
2634 | case ENOENT:
|
---|
2635 | /* The module was removed out from underneath us. */
|
---|
2636 | continue;
|
---|
2637 | default:
|
---|
2638 | bb_perror_msg_and_die("query_module: QM_SYMBOLS: %s", mn);
|
---|
2639 | }
|
---|
2640 | }
|
---|
2641 | nsyms = ret;
|
---|
2642 |
|
---|
2643 | m->name = mn;
|
---|
2644 | m->addr = info.addr;
|
---|
2645 | m->nsyms = nsyms;
|
---|
2646 | m->syms = syms;
|
---|
2647 |
|
---|
2648 | for (j = 0, s = syms; j < nsyms; ++j, ++s) {
|
---|
2649 | s->name += (unsigned long) syms;
|
---|
2650 | }
|
---|
2651 | }
|
---|
2652 | }
|
---|
2653 |
|
---|
2654 | /* Collect the kernel's symbols. */
|
---|
2655 |
|
---|
2656 | bufsize = 16 * 1024;
|
---|
2657 | syms = xmalloc(bufsize);
|
---|
2658 | retry_kern_sym_load:
|
---|
2659 | if (query_module(NULL, QM_SYMBOLS, syms, bufsize, &ret)) {
|
---|
2660 | if (errno == ENOSPC && bufsize < ret) {
|
---|
2661 | bufsize = ret;
|
---|
2662 | syms = xrealloc(syms, bufsize);
|
---|
2663 | goto retry_kern_sym_load;
|
---|
2664 | }
|
---|
2665 | bb_perror_msg_and_die("kernel: QM_SYMBOLS");
|
---|
2666 | }
|
---|
2667 | nksyms = nsyms = ret;
|
---|
2668 | ksyms = syms;
|
---|
2669 |
|
---|
2670 | for (j = 0, s = syms; j < nsyms; ++j, ++s) {
|
---|
2671 | s->name += (unsigned long) syms;
|
---|
2672 | }
|
---|
2673 | }
|
---|
2674 |
|
---|
2675 |
|
---|
2676 | /* Return the kernel symbol checksum version, or zero if not used. */
|
---|
2677 |
|
---|
2678 | static int new_is_kernel_checksummed(void)
|
---|
2679 | {
|
---|
2680 | struct new_module_symbol *s;
|
---|
2681 | size_t i;
|
---|
2682 |
|
---|
2683 | /* Using_Versions is not the first symbol, but it should be in there. */
|
---|
2684 |
|
---|
2685 | for (i = 0, s = ksyms; i < nksyms; ++i, ++s)
|
---|
2686 | if (strcmp((char *) s->name, "Using_Versions") == 0)
|
---|
2687 | return s->value;
|
---|
2688 |
|
---|
2689 | return 0;
|
---|
2690 | }
|
---|
2691 |
|
---|
2692 |
|
---|
2693 | static void new_create_this_module(struct obj_file *f, const char *m_name)
|
---|
2694 | {
|
---|
2695 | struct obj_section *sec;
|
---|
2696 |
|
---|
2697 | sec = obj_create_alloced_section_first(f, ".this", tgt_sizeof_long,
|
---|
2698 | sizeof(struct new_module));
|
---|
2699 | /* done by obj_create_alloced_section_first: */
|
---|
2700 | /*memset(sec->contents, 0, sizeof(struct new_module));*/
|
---|
2701 |
|
---|
2702 | obj_add_symbol(f, SPFX "__this_module", -1,
|
---|
2703 | ELF_ST_INFO(STB_LOCAL, STT_OBJECT), sec->idx, 0,
|
---|
2704 | sizeof(struct new_module));
|
---|
2705 |
|
---|
2706 | obj_string_patch(f, sec->idx, offsetof(struct new_module, name),
|
---|
2707 | m_name);
|
---|
2708 | }
|
---|
2709 |
|
---|
2710 | #if ENABLE_FEATURE_INSMOD_KSYMOOPS_SYMBOLS
|
---|
2711 | /* add an entry to the __ksymtab section, creating it if necessary */
|
---|
2712 | static void new_add_ksymtab(struct obj_file *f, struct obj_symbol *sym)
|
---|
2713 | {
|
---|
2714 | struct obj_section *sec;
|
---|
2715 | ElfW(Addr) ofs;
|
---|
2716 |
|
---|
2717 | /* ensure __ksymtab is allocated, EXPORT_NOSYMBOLS creates a non-alloc section.
|
---|
2718 | * If __ksymtab is defined but not marked alloc, x out the first character
|
---|
2719 | * (no obj_delete routine) and create a new __ksymtab with the correct
|
---|
2720 | * characteristics.
|
---|
2721 | */
|
---|
2722 | sec = obj_find_section(f, "__ksymtab");
|
---|
2723 | if (sec && !(sec->header.sh_flags & SHF_ALLOC)) {
|
---|
2724 | *((char *)(sec->name)) = 'x'; /* override const */
|
---|
2725 | sec = NULL;
|
---|
2726 | }
|
---|
2727 | if (!sec)
|
---|
2728 | sec = obj_create_alloced_section(f, "__ksymtab",
|
---|
2729 | tgt_sizeof_void_p, 0);
|
---|
2730 | if (!sec)
|
---|
2731 | return;
|
---|
2732 | sec->header.sh_flags |= SHF_ALLOC;
|
---|
2733 | /* Empty section might be byte-aligned */
|
---|
2734 | sec->header.sh_addralign = tgt_sizeof_void_p;
|
---|
2735 | ofs = sec->header.sh_size;
|
---|
2736 | obj_symbol_patch(f, sec->idx, ofs, sym);
|
---|
2737 | obj_string_patch(f, sec->idx, ofs + tgt_sizeof_void_p, sym->name);
|
---|
2738 | obj_extend_section(sec, 2 * tgt_sizeof_char_p);
|
---|
2739 | }
|
---|
2740 | #endif /* FEATURE_INSMOD_KSYMOOPS_SYMBOLS */
|
---|
2741 |
|
---|
2742 | static int new_create_module_ksymtab(struct obj_file *f)
|
---|
2743 | {
|
---|
2744 | struct obj_section *sec;
|
---|
2745 | int i;
|
---|
2746 |
|
---|
2747 | /* We must always add the module references. */
|
---|
2748 |
|
---|
2749 | if (n_ext_modules_used) {
|
---|
2750 | struct new_module_ref *dep;
|
---|
2751 | struct obj_symbol *tm;
|
---|
2752 |
|
---|
2753 | sec = obj_create_alloced_section(f, ".kmodtab", tgt_sizeof_void_p,
|
---|
2754 | (sizeof(struct new_module_ref)
|
---|
2755 | * n_ext_modules_used));
|
---|
2756 | if (!sec)
|
---|
2757 | return 0;
|
---|
2758 |
|
---|
2759 | tm = obj_find_symbol(f, SPFX "__this_module");
|
---|
2760 | dep = (struct new_module_ref *) sec->contents;
|
---|
2761 | for (i = 0; i < n_ext_modules; ++i)
|
---|
2762 | if (ext_modules[i].used) {
|
---|
2763 | dep->dep = ext_modules[i].addr;
|
---|
2764 | obj_symbol_patch(f, sec->idx,
|
---|
2765 | (char *) &dep->ref - sec->contents, tm);
|
---|
2766 | dep->next_ref = 0;
|
---|
2767 | ++dep;
|
---|
2768 | }
|
---|
2769 | }
|
---|
2770 |
|
---|
2771 | if (!flag_noexport && !obj_find_section(f, "__ksymtab")) {
|
---|
2772 | size_t nsyms;
|
---|
2773 | int *loaded;
|
---|
2774 |
|
---|
2775 | sec = obj_create_alloced_section(f, "__ksymtab", tgt_sizeof_void_p, 0);
|
---|
2776 |
|
---|
2777 | /* We don't want to export symbols residing in sections that
|
---|
2778 | aren't loaded. There are a number of these created so that
|
---|
2779 | we make sure certain module options don't appear twice. */
|
---|
2780 | i = f->header.e_shnum;
|
---|
2781 | loaded = alloca(sizeof(int) * i);
|
---|
2782 | while (--i >= 0)
|
---|
2783 | loaded[i] = (f->sections[i]->header.sh_flags & SHF_ALLOC) != 0;
|
---|
2784 |
|
---|
2785 | for (nsyms = i = 0; i < HASH_BUCKETS; ++i) {
|
---|
2786 | struct obj_symbol *sym;
|
---|
2787 | for (sym = f->symtab[i]; sym; sym = sym->next) {
|
---|
2788 | if (ELF_ST_BIND(sym->info) != STB_LOCAL
|
---|
2789 | && sym->secidx <= SHN_HIRESERVE
|
---|
2790 | && (sym->secidx >= SHN_LORESERVE || loaded[sym->secidx])
|
---|
2791 | ) {
|
---|
2792 | ElfW(Addr) ofs = nsyms * 2 * tgt_sizeof_void_p;
|
---|
2793 |
|
---|
2794 | obj_symbol_patch(f, sec->idx, ofs, sym);
|
---|
2795 | obj_string_patch(f, sec->idx, ofs + tgt_sizeof_void_p,
|
---|
2796 | sym->name);
|
---|
2797 | nsyms++;
|
---|
2798 | }
|
---|
2799 | }
|
---|
2800 | }
|
---|
2801 |
|
---|
2802 | obj_extend_section(sec, nsyms * 2 * tgt_sizeof_char_p);
|
---|
2803 | }
|
---|
2804 |
|
---|
2805 | return 1;
|
---|
2806 | }
|
---|
2807 |
|
---|
2808 |
|
---|
2809 | static int
|
---|
2810 | new_init_module(const char *m_name, struct obj_file *f, unsigned long m_size)
|
---|
2811 | {
|
---|
2812 | struct new_module *module;
|
---|
2813 | struct obj_section *sec;
|
---|
2814 | void *image;
|
---|
2815 | int ret;
|
---|
2816 | tgt_long m_addr;
|
---|
2817 |
|
---|
2818 | sec = obj_find_section(f, ".this");
|
---|
2819 | if (!sec || !sec->contents) {
|
---|
2820 | bb_perror_msg_and_die("corrupt module %s?", m_name);
|
---|
2821 | }
|
---|
2822 | module = (struct new_module *) sec->contents;
|
---|
2823 | m_addr = sec->header.sh_addr;
|
---|
2824 |
|
---|
2825 | module->size_of_struct = sizeof(*module);
|
---|
2826 | module->size = m_size;
|
---|
2827 | module->flags = flag_autoclean ? NEW_MOD_AUTOCLEAN : 0;
|
---|
2828 |
|
---|
2829 | sec = obj_find_section(f, "__ksymtab");
|
---|
2830 | if (sec && sec->header.sh_size) {
|
---|
2831 | module->syms = sec->header.sh_addr;
|
---|
2832 | module->nsyms = sec->header.sh_size / (2 * tgt_sizeof_char_p);
|
---|
2833 | }
|
---|
2834 |
|
---|
2835 | if (n_ext_modules_used) {
|
---|
2836 | sec = obj_find_section(f, ".kmodtab");
|
---|
2837 | module->deps = sec->header.sh_addr;
|
---|
2838 | module->ndeps = n_ext_modules_used;
|
---|
2839 | }
|
---|
2840 |
|
---|
2841 | module->init = obj_symbol_final_value(f, obj_find_symbol(f, SPFX "init_module"));
|
---|
2842 | module->cleanup = obj_symbol_final_value(f, obj_find_symbol(f, SPFX "cleanup_module"));
|
---|
2843 |
|
---|
2844 | sec = obj_find_section(f, "__ex_table");
|
---|
2845 | if (sec) {
|
---|
2846 | module->ex_table_start = sec->header.sh_addr;
|
---|
2847 | module->ex_table_end = sec->header.sh_addr + sec->header.sh_size;
|
---|
2848 | }
|
---|
2849 |
|
---|
2850 | sec = obj_find_section(f, ".text.init");
|
---|
2851 | if (sec) {
|
---|
2852 | module->runsize = sec->header.sh_addr - m_addr;
|
---|
2853 | }
|
---|
2854 | sec = obj_find_section(f, ".data.init");
|
---|
2855 | if (sec) {
|
---|
2856 | if (!module->runsize
|
---|
2857 | || module->runsize > sec->header.sh_addr - m_addr
|
---|
2858 | ) {
|
---|
2859 | module->runsize = sec->header.sh_addr - m_addr;
|
---|
2860 | }
|
---|
2861 | }
|
---|
2862 | sec = obj_find_section(f, ARCHDATA_SEC_NAME);
|
---|
2863 | if (sec && sec->header.sh_size) {
|
---|
2864 | module->archdata_start = (void*)sec->header.sh_addr;
|
---|
2865 | module->archdata_end = module->archdata_start + sec->header.sh_size;
|
---|
2866 | }
|
---|
2867 | sec = obj_find_section(f, KALLSYMS_SEC_NAME);
|
---|
2868 | if (sec && sec->header.sh_size) {
|
---|
2869 | module->kallsyms_start = (void*)sec->header.sh_addr;
|
---|
2870 | module->kallsyms_end = module->kallsyms_start + sec->header.sh_size;
|
---|
2871 | }
|
---|
2872 |
|
---|
2873 | /* Whew! All of the initialization is complete. Collect the final
|
---|
2874 | module image and give it to the kernel. */
|
---|
2875 |
|
---|
2876 | image = xmalloc(m_size);
|
---|
2877 | obj_create_image(f, image);
|
---|
2878 |
|
---|
2879 | ret = init_module(m_name, (struct new_module *) image);
|
---|
2880 | if (ret)
|
---|
2881 | bb_perror_msg("init_module: %s", m_name);
|
---|
2882 |
|
---|
2883 | free(image);
|
---|
2884 |
|
---|
2885 | return ret == 0;
|
---|
2886 | }
|
---|
2887 |
|
---|
2888 |
|
---|
2889 | /*======================================================================*/
|
---|
2890 |
|
---|
2891 | static void
|
---|
2892 | obj_string_patch(struct obj_file *f, int secidx, ElfW(Addr) offset,
|
---|
2893 | const char *string)
|
---|
2894 | {
|
---|
2895 | struct obj_string_patch *p;
|
---|
2896 | struct obj_section *strsec;
|
---|
2897 | size_t len = strlen(string) + 1;
|
---|
2898 | char *loc;
|
---|
2899 |
|
---|
2900 | p = xzalloc(sizeof(*p));
|
---|
2901 | p->next = f->string_patches;
|
---|
2902 | p->reloc_secidx = secidx;
|
---|
2903 | p->reloc_offset = offset;
|
---|
2904 | f->string_patches = p;
|
---|
2905 |
|
---|
2906 | strsec = obj_find_section(f, ".kstrtab");
|
---|
2907 | if (strsec == NULL) {
|
---|
2908 | strsec = obj_create_alloced_section(f, ".kstrtab", 1, len);
|
---|
2909 | /*p->string_offset = 0;*/
|
---|
2910 | loc = strsec->contents;
|
---|
2911 | } else {
|
---|
2912 | p->string_offset = strsec->header.sh_size;
|
---|
2913 | loc = obj_extend_section(strsec, len);
|
---|
2914 | }
|
---|
2915 | memcpy(loc, string, len);
|
---|
2916 | }
|
---|
2917 |
|
---|
2918 | static void
|
---|
2919 | obj_symbol_patch(struct obj_file *f, int secidx, ElfW(Addr) offset,
|
---|
2920 | struct obj_symbol *sym)
|
---|
2921 | {
|
---|
2922 | struct obj_symbol_patch *p;
|
---|
2923 |
|
---|
2924 | p = xmalloc(sizeof(*p));
|
---|
2925 | p->next = f->symbol_patches;
|
---|
2926 | p->reloc_secidx = secidx;
|
---|
2927 | p->reloc_offset = offset;
|
---|
2928 | p->sym = sym;
|
---|
2929 | f->symbol_patches = p;
|
---|
2930 | }
|
---|
2931 |
|
---|
2932 | static void obj_check_undefineds(struct obj_file *f)
|
---|
2933 | {
|
---|
2934 | unsigned i;
|
---|
2935 |
|
---|
2936 | for (i = 0; i < HASH_BUCKETS; ++i) {
|
---|
2937 | struct obj_symbol *sym;
|
---|
2938 | for (sym = f->symtab[i]; sym; sym = sym->next) {
|
---|
2939 | if (sym->secidx == SHN_UNDEF) {
|
---|
2940 | if (ELF_ST_BIND(sym->info) == STB_WEAK) {
|
---|
2941 | sym->secidx = SHN_ABS;
|
---|
2942 | sym->value = 0;
|
---|
2943 | } else {
|
---|
2944 | if (!flag_quiet)
|
---|
2945 | bb_error_msg_and_die("unresolved symbol %s", sym->name);
|
---|
2946 | }
|
---|
2947 | }
|
---|
2948 | }
|
---|
2949 | }
|
---|
2950 | }
|
---|
2951 |
|
---|
2952 | static void obj_allocate_commons(struct obj_file *f)
|
---|
2953 | {
|
---|
2954 | struct common_entry {
|
---|
2955 | struct common_entry *next;
|
---|
2956 | struct obj_symbol *sym;
|
---|
2957 | } *common_head = NULL;
|
---|
2958 |
|
---|
2959 | unsigned long i;
|
---|
2960 |
|
---|
2961 | for (i = 0; i < HASH_BUCKETS; ++i) {
|
---|
2962 | struct obj_symbol *sym;
|
---|
2963 | for (sym = f->symtab[i]; sym; sym = sym->next) {
|
---|
2964 | if (sym->secidx == SHN_COMMON) {
|
---|
2965 | /* Collect all COMMON symbols and sort them by size so as to
|
---|
2966 | minimize space wasted by alignment requirements. */
|
---|
2967 | struct common_entry **p, *n;
|
---|
2968 | for (p = &common_head; *p; p = &(*p)->next)
|
---|
2969 | if (sym->size <= (*p)->sym->size)
|
---|
2970 | break;
|
---|
2971 | n = alloca(sizeof(*n));
|
---|
2972 | n->next = *p;
|
---|
2973 | n->sym = sym;
|
---|
2974 | *p = n;
|
---|
2975 | }
|
---|
2976 | }
|
---|
2977 | }
|
---|
2978 |
|
---|
2979 | for (i = 1; i < f->local_symtab_size; ++i) {
|
---|
2980 | struct obj_symbol *sym = f->local_symtab[i];
|
---|
2981 | if (sym && sym->secidx == SHN_COMMON) {
|
---|
2982 | struct common_entry **p, *n;
|
---|
2983 | for (p = &common_head; *p; p = &(*p)->next) {
|
---|
2984 | if (sym == (*p)->sym)
|
---|
2985 | break;
|
---|
2986 | if (sym->size < (*p)->sym->size) {
|
---|
2987 | n = alloca(sizeof(*n));
|
---|
2988 | n->next = *p;
|
---|
2989 | n->sym = sym;
|
---|
2990 | *p = n;
|
---|
2991 | break;
|
---|
2992 | }
|
---|
2993 | }
|
---|
2994 | }
|
---|
2995 | }
|
---|
2996 |
|
---|
2997 | if (common_head) {
|
---|
2998 | /* Find the bss section. */
|
---|
2999 | for (i = 0; i < f->header.e_shnum; ++i)
|
---|
3000 | if (f->sections[i]->header.sh_type == SHT_NOBITS)
|
---|
3001 | break;
|
---|
3002 |
|
---|
3003 | /* If for some reason there hadn't been one, create one. */
|
---|
3004 | if (i == f->header.e_shnum) {
|
---|
3005 | struct obj_section *sec;
|
---|
3006 |
|
---|
3007 | f->header.e_shnum++;
|
---|
3008 | f->sections = xrealloc_vector(f->sections, 2, i);
|
---|
3009 | f->sections[i] = sec = arch_new_section();
|
---|
3010 |
|
---|
3011 | sec->header.sh_type = SHT_PROGBITS;
|
---|
3012 | sec->header.sh_flags = SHF_WRITE | SHF_ALLOC;
|
---|
3013 | sec->name = ".bss";
|
---|
3014 | sec->idx = i;
|
---|
3015 | }
|
---|
3016 |
|
---|
3017 | /* Allocate the COMMONS. */
|
---|
3018 | {
|
---|
3019 | ElfW(Addr) bss_size = f->sections[i]->header.sh_size;
|
---|
3020 | ElfW(Addr) max_align = f->sections[i]->header.sh_addralign;
|
---|
3021 | struct common_entry *c;
|
---|
3022 |
|
---|
3023 | for (c = common_head; c; c = c->next) {
|
---|
3024 | ElfW(Addr) align = c->sym->value;
|
---|
3025 |
|
---|
3026 | if (align > max_align)
|
---|
3027 | max_align = align;
|
---|
3028 | if (bss_size & (align - 1))
|
---|
3029 | bss_size = (bss_size | (align - 1)) + 1;
|
---|
3030 |
|
---|
3031 | c->sym->secidx = i;
|
---|
3032 | c->sym->value = bss_size;
|
---|
3033 |
|
---|
3034 | bss_size += c->sym->size;
|
---|
3035 | }
|
---|
3036 |
|
---|
3037 | f->sections[i]->header.sh_size = bss_size;
|
---|
3038 | f->sections[i]->header.sh_addralign = max_align;
|
---|
3039 | }
|
---|
3040 | }
|
---|
3041 |
|
---|
3042 | /* For the sake of patch relocation and parameter initialization,
|
---|
3043 | allocate zeroed data for NOBITS sections now. Note that after
|
---|
3044 | this we cannot assume NOBITS are really empty. */
|
---|
3045 | for (i = 0; i < f->header.e_shnum; ++i) {
|
---|
3046 | struct obj_section *s = f->sections[i];
|
---|
3047 | if (s->header.sh_type == SHT_NOBITS) {
|
---|
3048 | s->contents = NULL;
|
---|
3049 | if (s->header.sh_size != 0)
|
---|
3050 | s->contents = xzalloc(s->header.sh_size);
|
---|
3051 | s->header.sh_type = SHT_PROGBITS;
|
---|
3052 | }
|
---|
3053 | }
|
---|
3054 | }
|
---|
3055 |
|
---|
3056 | static unsigned long obj_load_size(struct obj_file *f)
|
---|
3057 | {
|
---|
3058 | unsigned long dot = 0;
|
---|
3059 | struct obj_section *sec;
|
---|
3060 |
|
---|
3061 | /* Finalize the positions of the sections relative to one another. */
|
---|
3062 |
|
---|
3063 | for (sec = f->load_order; sec; sec = sec->load_next) {
|
---|
3064 | ElfW(Addr) align;
|
---|
3065 |
|
---|
3066 | align = sec->header.sh_addralign;
|
---|
3067 | if (align && (dot & (align - 1)))
|
---|
3068 | dot = (dot | (align - 1)) + 1;
|
---|
3069 |
|
---|
3070 | sec->header.sh_addr = dot;
|
---|
3071 | dot += sec->header.sh_size;
|
---|
3072 | }
|
---|
3073 |
|
---|
3074 | return dot;
|
---|
3075 | }
|
---|
3076 |
|
---|
3077 | static int obj_relocate(struct obj_file *f, ElfW(Addr) base)
|
---|
3078 | {
|
---|
3079 | int i, n = f->header.e_shnum;
|
---|
3080 | int ret = 1;
|
---|
3081 |
|
---|
3082 | /* Finalize the addresses of the sections. */
|
---|
3083 |
|
---|
3084 | f->baseaddr = base;
|
---|
3085 | for (i = 0; i < n; ++i)
|
---|
3086 | f->sections[i]->header.sh_addr += base;
|
---|
3087 |
|
---|
3088 | /* And iterate over all of the relocations. */
|
---|
3089 |
|
---|
3090 | for (i = 0; i < n; ++i) {
|
---|
3091 | struct obj_section *relsec, *symsec, *targsec, *strsec;
|
---|
3092 | ElfW(RelM) * rel, *relend;
|
---|
3093 | ElfW(Sym) * symtab;
|
---|
3094 | const char *strtab;
|
---|
3095 |
|
---|
3096 | relsec = f->sections[i];
|
---|
3097 | if (relsec->header.sh_type != SHT_RELM)
|
---|
3098 | continue;
|
---|
3099 |
|
---|
3100 | symsec = f->sections[relsec->header.sh_link];
|
---|
3101 | targsec = f->sections[relsec->header.sh_info];
|
---|
3102 | strsec = f->sections[symsec->header.sh_link];
|
---|
3103 |
|
---|
3104 | rel = (ElfW(RelM) *) relsec->contents;
|
---|
3105 | relend = rel + (relsec->header.sh_size / sizeof(ElfW(RelM)));
|
---|
3106 | symtab = (ElfW(Sym) *) symsec->contents;
|
---|
3107 | strtab = (const char *) strsec->contents;
|
---|
3108 |
|
---|
3109 | for (; rel < relend; ++rel) {
|
---|
3110 | ElfW(Addr) value = 0;
|
---|
3111 | struct obj_symbol *intsym = NULL;
|
---|
3112 | unsigned long symndx;
|
---|
3113 | ElfW(Sym) *extsym = NULL;
|
---|
3114 | const char *errmsg;
|
---|
3115 |
|
---|
3116 | /* Attempt to find a value to use for this relocation. */
|
---|
3117 |
|
---|
3118 | symndx = ELF_R_SYM(rel->r_info);
|
---|
3119 | if (symndx) {
|
---|
3120 | /* Note we've already checked for undefined symbols. */
|
---|
3121 |
|
---|
3122 | extsym = &symtab[symndx];
|
---|
3123 | if (ELF_ST_BIND(extsym->st_info) == STB_LOCAL) {
|
---|
3124 | /* Local symbols we look up in the local table to be sure
|
---|
3125 | we get the one that is really intended. */
|
---|
3126 | intsym = f->local_symtab[symndx];
|
---|
3127 | } else {
|
---|
3128 | /* Others we look up in the hash table. */
|
---|
3129 | const char *name;
|
---|
3130 | if (extsym->st_name)
|
---|
3131 | name = strtab + extsym->st_name;
|
---|
3132 | else
|
---|
3133 | name = f->sections[extsym->st_shndx]->name;
|
---|
3134 | intsym = obj_find_symbol(f, name);
|
---|
3135 | }
|
---|
3136 |
|
---|
3137 | value = obj_symbol_final_value(f, intsym);
|
---|
3138 | intsym->referenced = 1;
|
---|
3139 | }
|
---|
3140 | #if SHT_RELM == SHT_RELA
|
---|
3141 | #if defined(__alpha__) && defined(AXP_BROKEN_GAS)
|
---|
3142 | /* Work around a nasty GAS bug, that is fixed as of 2.7.0.9. */
|
---|
3143 | if (!extsym || !extsym->st_name
|
---|
3144 | || ELF_ST_BIND(extsym->st_info) != STB_LOCAL)
|
---|
3145 | #endif
|
---|
3146 | value += rel->r_addend;
|
---|
3147 | #endif
|
---|
3148 |
|
---|
3149 | /* Do it! */
|
---|
3150 | switch (arch_apply_relocation
|
---|
3151 | (f, targsec, /*symsec,*/ intsym, rel, value)
|
---|
3152 | ) {
|
---|
3153 | case obj_reloc_ok:
|
---|
3154 | break;
|
---|
3155 |
|
---|
3156 | case obj_reloc_overflow:
|
---|
3157 | errmsg = "Relocation overflow";
|
---|
3158 | goto bad_reloc;
|
---|
3159 | case obj_reloc_dangerous:
|
---|
3160 | errmsg = "Dangerous relocation";
|
---|
3161 | goto bad_reloc;
|
---|
3162 | case obj_reloc_unhandled:
|
---|
3163 | errmsg = "Unhandled relocation";
|
---|
3164 | bad_reloc:
|
---|
3165 | if (extsym) {
|
---|
3166 | bb_error_msg("%s of type %ld for %s", errmsg,
|
---|
3167 | (long) ELF_R_TYPE(rel->r_info),
|
---|
3168 | strtab + extsym->st_name);
|
---|
3169 | } else {
|
---|
3170 | bb_error_msg("%s of type %ld", errmsg,
|
---|
3171 | (long) ELF_R_TYPE(rel->r_info));
|
---|
3172 | }
|
---|
3173 | ret = 0;
|
---|
3174 | break;
|
---|
3175 | }
|
---|
3176 | }
|
---|
3177 | }
|
---|
3178 |
|
---|
3179 | /* Finally, take care of the patches. */
|
---|
3180 |
|
---|
3181 | if (f->string_patches) {
|
---|
3182 | struct obj_string_patch *p;
|
---|
3183 | struct obj_section *strsec;
|
---|
3184 | ElfW(Addr) strsec_base;
|
---|
3185 | strsec = obj_find_section(f, ".kstrtab");
|
---|
3186 | strsec_base = strsec->header.sh_addr;
|
---|
3187 |
|
---|
3188 | for (p = f->string_patches; p; p = p->next) {
|
---|
3189 | struct obj_section *targsec = f->sections[p->reloc_secidx];
|
---|
3190 | *(ElfW(Addr) *) (targsec->contents + p->reloc_offset)
|
---|
3191 | = strsec_base + p->string_offset;
|
---|
3192 | }
|
---|
3193 | }
|
---|
3194 |
|
---|
3195 | if (f->symbol_patches) {
|
---|
3196 | struct obj_symbol_patch *p;
|
---|
3197 |
|
---|
3198 | for (p = f->symbol_patches; p; p = p->next) {
|
---|
3199 | struct obj_section *targsec = f->sections[p->reloc_secidx];
|
---|
3200 | *(ElfW(Addr) *) (targsec->contents + p->reloc_offset)
|
---|
3201 | = obj_symbol_final_value(f, p->sym);
|
---|
3202 | }
|
---|
3203 | }
|
---|
3204 |
|
---|
3205 | return ret;
|
---|
3206 | }
|
---|
3207 |
|
---|
3208 | static int obj_create_image(struct obj_file *f, char *image)
|
---|
3209 | {
|
---|
3210 | struct obj_section *sec;
|
---|
3211 | ElfW(Addr) base = f->baseaddr;
|
---|
3212 |
|
---|
3213 | for (sec = f->load_order; sec; sec = sec->load_next) {
|
---|
3214 | char *secimg;
|
---|
3215 |
|
---|
3216 | if (sec->contents == 0 || sec->header.sh_size == 0)
|
---|
3217 | continue;
|
---|
3218 |
|
---|
3219 | secimg = image + (sec->header.sh_addr - base);
|
---|
3220 |
|
---|
3221 | /* Note that we allocated data for NOBITS sections earlier. */
|
---|
3222 | memcpy(secimg, sec->contents, sec->header.sh_size);
|
---|
3223 | }
|
---|
3224 |
|
---|
3225 | return 1;
|
---|
3226 | }
|
---|
3227 |
|
---|
3228 | /*======================================================================*/
|
---|
3229 |
|
---|
3230 | static struct obj_file *obj_load(char *image, size_t image_size, int loadprogbits)
|
---|
3231 | {
|
---|
3232 | typedef uint32_t aliased_uint32_t FIX_ALIASING;
|
---|
3233 | #if BB_LITTLE_ENDIAN
|
---|
3234 | # define ELFMAG_U32 ((uint32_t)(ELFMAG0 + 0x100 * (ELFMAG1 + (0x100 * (ELFMAG2 + 0x100 * ELFMAG3)))))
|
---|
3235 | #else
|
---|
3236 | # define ELFMAG_U32 ((uint32_t)((((ELFMAG0 * 0x100) + ELFMAG1) * 0x100 + ELFMAG2) * 0x100 + ELFMAG3))
|
---|
3237 | #endif
|
---|
3238 | struct obj_file *f;
|
---|
3239 | ElfW(Shdr) * section_headers;
|
---|
3240 | size_t shnum, i;
|
---|
3241 | char *shstrtab;
|
---|
3242 |
|
---|
3243 | /* Read the file header. */
|
---|
3244 |
|
---|
3245 | f = arch_new_file();
|
---|
3246 | f->symbol_cmp = strcmp;
|
---|
3247 | f->symbol_hash = obj_elf_hash;
|
---|
3248 | f->load_order_search_start = &f->load_order;
|
---|
3249 |
|
---|
3250 | if (image_size < sizeof(f->header))
|
---|
3251 | bb_error_msg_and_die("error while loading ELF header");
|
---|
3252 | memcpy(&f->header, image, sizeof(f->header));
|
---|
3253 |
|
---|
3254 | if (*(aliased_uint32_t*)(&f->header.e_ident) != ELFMAG_U32) {
|
---|
3255 | bb_error_msg_and_die("not an ELF file");
|
---|
3256 | }
|
---|
3257 | if (f->header.e_ident[EI_CLASS] != ELFCLASSM
|
---|
3258 | || f->header.e_ident[EI_DATA] != (BB_BIG_ENDIAN ? ELFDATA2MSB : ELFDATA2LSB)
|
---|
3259 | || f->header.e_ident[EI_VERSION] != EV_CURRENT
|
---|
3260 | || !MATCH_MACHINE(f->header.e_machine)
|
---|
3261 | ) {
|
---|
3262 | bb_error_msg_and_die("ELF file not for this architecture");
|
---|
3263 | }
|
---|
3264 | if (f->header.e_type != ET_REL) {
|
---|
3265 | bb_error_msg_and_die("ELF file not a relocatable object");
|
---|
3266 | }
|
---|
3267 |
|
---|
3268 | /* Read the section headers. */
|
---|
3269 |
|
---|
3270 | if (f->header.e_shentsize != sizeof(ElfW(Shdr))) {
|
---|
3271 | bb_error_msg_and_die("section header size mismatch: %lu != %lu",
|
---|
3272 | (unsigned long) f->header.e_shentsize,
|
---|
3273 | (unsigned long) sizeof(ElfW(Shdr)));
|
---|
3274 | }
|
---|
3275 |
|
---|
3276 | shnum = f->header.e_shnum;
|
---|
3277 | /* Growth of ->sections vector will be done by
|
---|
3278 | * xrealloc_vector(..., 2, ...), therefore we must allocate
|
---|
3279 | * at least 2^2 = 4 extra elements here. */
|
---|
3280 | f->sections = xzalloc(sizeof(f->sections[0]) * (shnum + 4));
|
---|
3281 |
|
---|
3282 | section_headers = alloca(sizeof(ElfW(Shdr)) * shnum);
|
---|
3283 | if (image_size < f->header.e_shoff + sizeof(ElfW(Shdr)) * shnum)
|
---|
3284 | bb_error_msg_and_die("error while loading section headers");
|
---|
3285 | memcpy(section_headers, image + f->header.e_shoff, sizeof(ElfW(Shdr)) * shnum);
|
---|
3286 |
|
---|
3287 | /* Read the section data. */
|
---|
3288 |
|
---|
3289 | for (i = 0; i < shnum; ++i) {
|
---|
3290 | struct obj_section *sec;
|
---|
3291 |
|
---|
3292 | f->sections[i] = sec = arch_new_section();
|
---|
3293 |
|
---|
3294 | sec->header = section_headers[i];
|
---|
3295 | sec->idx = i;
|
---|
3296 |
|
---|
3297 | if (sec->header.sh_size) {
|
---|
3298 | switch (sec->header.sh_type) {
|
---|
3299 | case SHT_NULL:
|
---|
3300 | case SHT_NOTE:
|
---|
3301 | case SHT_NOBITS:
|
---|
3302 | /* ignore */
|
---|
3303 | break;
|
---|
3304 | case SHT_PROGBITS:
|
---|
3305 | #if LOADBITS
|
---|
3306 | if (!loadprogbits) {
|
---|
3307 | sec->contents = NULL;
|
---|
3308 | break;
|
---|
3309 | }
|
---|
3310 | #endif
|
---|
3311 | case SHT_SYMTAB:
|
---|
3312 | case SHT_STRTAB:
|
---|
3313 | case SHT_RELM:
|
---|
3314 | #if defined(__mips__)
|
---|
3315 | case SHT_MIPS_DWARF:
|
---|
3316 | #endif
|
---|
3317 | sec->contents = NULL;
|
---|
3318 | if (sec->header.sh_size > 0) {
|
---|
3319 | sec->contents = xmalloc(sec->header.sh_size);
|
---|
3320 | if (image_size < (sec->header.sh_offset + sec->header.sh_size))
|
---|
3321 | bb_error_msg_and_die("error while loading section data");
|
---|
3322 | memcpy(sec->contents, image + sec->header.sh_offset, sec->header.sh_size);
|
---|
3323 | }
|
---|
3324 | break;
|
---|
3325 | #if SHT_RELM == SHT_REL
|
---|
3326 | case SHT_RELA:
|
---|
3327 | bb_error_msg_and_die("RELA relocations not supported on this architecture");
|
---|
3328 | #else
|
---|
3329 | case SHT_REL:
|
---|
3330 | bb_error_msg_and_die("REL relocations not supported on this architecture");
|
---|
3331 | #endif
|
---|
3332 | default:
|
---|
3333 | if (sec->header.sh_type >= SHT_LOPROC) {
|
---|
3334 | /* Assume processor specific section types are debug
|
---|
3335 | info and can safely be ignored. If this is ever not
|
---|
3336 | the case (Hello MIPS?), don't put ifdefs here but
|
---|
3337 | create an arch_load_proc_section(). */
|
---|
3338 | break;
|
---|
3339 | }
|
---|
3340 |
|
---|
3341 | bb_error_msg_and_die("can't handle sections of type %ld",
|
---|
3342 | (long) sec->header.sh_type);
|
---|
3343 | }
|
---|
3344 | }
|
---|
3345 | }
|
---|
3346 |
|
---|
3347 | /* Do what sort of interpretation as needed by each section. */
|
---|
3348 |
|
---|
3349 | shstrtab = f->sections[f->header.e_shstrndx]->contents;
|
---|
3350 |
|
---|
3351 | for (i = 0; i < shnum; ++i) {
|
---|
3352 | struct obj_section *sec = f->sections[i];
|
---|
3353 | sec->name = shstrtab + sec->header.sh_name;
|
---|
3354 | }
|
---|
3355 |
|
---|
3356 | for (i = 0; i < shnum; ++i) {
|
---|
3357 | struct obj_section *sec = f->sections[i];
|
---|
3358 |
|
---|
3359 | /* .modinfo should be contents only but gcc has no attribute for that.
|
---|
3360 | * The kernel may have marked .modinfo as ALLOC, ignore this bit.
|
---|
3361 | */
|
---|
3362 | if (strcmp(sec->name, ".modinfo") == 0)
|
---|
3363 | sec->header.sh_flags &= ~SHF_ALLOC;
|
---|
3364 |
|
---|
3365 | if (sec->header.sh_flags & SHF_ALLOC)
|
---|
3366 | obj_insert_section_load_order(f, sec);
|
---|
3367 |
|
---|
3368 | switch (sec->header.sh_type) {
|
---|
3369 | case SHT_SYMTAB:
|
---|
3370 | {
|
---|
3371 | unsigned long nsym, j;
|
---|
3372 | char *strtab;
|
---|
3373 | ElfW(Sym) * sym;
|
---|
3374 |
|
---|
3375 | if (sec->header.sh_entsize != sizeof(ElfW(Sym))) {
|
---|
3376 | bb_error_msg_and_die("symbol size mismatch: %lu != %lu",
|
---|
3377 | (unsigned long) sec->header.sh_entsize,
|
---|
3378 | (unsigned long) sizeof(ElfW(Sym)));
|
---|
3379 | }
|
---|
3380 |
|
---|
3381 | nsym = sec->header.sh_size / sizeof(ElfW(Sym));
|
---|
3382 | strtab = f->sections[sec->header.sh_link]->contents;
|
---|
3383 | sym = (ElfW(Sym) *) sec->contents;
|
---|
3384 |
|
---|
3385 | /* Allocate space for a table of local symbols. */
|
---|
3386 | j = f->local_symtab_size = sec->header.sh_info;
|
---|
3387 | f->local_symtab = xzalloc(j * sizeof(struct obj_symbol *));
|
---|
3388 |
|
---|
3389 | /* Insert all symbols into the hash table. */
|
---|
3390 | for (j = 1, ++sym; j < nsym; ++j, ++sym) {
|
---|
3391 | ElfW(Addr) val = sym->st_value;
|
---|
3392 | const char *name;
|
---|
3393 | if (sym->st_name)
|
---|
3394 | name = strtab + sym->st_name;
|
---|
3395 | else if (sym->st_shndx < shnum)
|
---|
3396 | name = f->sections[sym->st_shndx]->name;
|
---|
3397 | else
|
---|
3398 | continue;
|
---|
3399 | #if defined(__SH5__)
|
---|
3400 | /*
|
---|
3401 | * For sh64 it is possible that the target of a branch
|
---|
3402 | * requires a mode switch (32 to 16 and back again).
|
---|
3403 | *
|
---|
3404 | * This is implied by the lsb being set in the target
|
---|
3405 | * address for SHmedia mode and clear for SHcompact.
|
---|
3406 | */
|
---|
3407 | val |= sym->st_other & 4;
|
---|
3408 | #endif
|
---|
3409 | obj_add_symbol(f, name, j, sym->st_info, sym->st_shndx,
|
---|
3410 | val, sym->st_size);
|
---|
3411 | }
|
---|
3412 | }
|
---|
3413 | break;
|
---|
3414 |
|
---|
3415 | case SHT_RELM:
|
---|
3416 | if (sec->header.sh_entsize != sizeof(ElfW(RelM))) {
|
---|
3417 | bb_error_msg_and_die("relocation entry size mismatch: %lu != %lu",
|
---|
3418 | (unsigned long) sec->header.sh_entsize,
|
---|
3419 | (unsigned long) sizeof(ElfW(RelM)));
|
---|
3420 | }
|
---|
3421 | break;
|
---|
3422 | /* XXX Relocation code from modutils-2.3.19 is not here.
|
---|
3423 | * Why? That's about 20 lines of code from obj/obj_load.c,
|
---|
3424 | * which gets done in a second pass through the sections.
|
---|
3425 | * This BusyBox insmod does similar work in obj_relocate(). */
|
---|
3426 | }
|
---|
3427 | }
|
---|
3428 |
|
---|
3429 | return f;
|
---|
3430 | }
|
---|
3431 |
|
---|
3432 | #if ENABLE_FEATURE_INSMOD_LOADINKMEM
|
---|
3433 | /*
|
---|
3434 | * load the unloaded sections directly into the memory allocated by
|
---|
3435 | * kernel for the module
|
---|
3436 | */
|
---|
3437 |
|
---|
3438 | static int obj_load_progbits(char *image, size_t image_size, struct obj_file *f, char *imagebase)
|
---|
3439 | {
|
---|
3440 | ElfW(Addr) base = f->baseaddr;
|
---|
3441 | struct obj_section* sec;
|
---|
3442 |
|
---|
3443 | for (sec = f->load_order; sec; sec = sec->load_next) {
|
---|
3444 | /* section already loaded? */
|
---|
3445 | if (sec->contents != NULL)
|
---|
3446 | continue;
|
---|
3447 | if (sec->header.sh_size == 0)
|
---|
3448 | continue;
|
---|
3449 | sec->contents = imagebase + (sec->header.sh_addr - base);
|
---|
3450 | if (image_size < (sec->header.sh_offset + sec->header.sh_size)) {
|
---|
3451 | bb_error_msg("error reading ELF section data");
|
---|
3452 | return 0; /* need to delete half-loaded module! */
|
---|
3453 | }
|
---|
3454 | memcpy(sec->contents, image + sec->header.sh_offset, sec->header.sh_size);
|
---|
3455 | }
|
---|
3456 | return 1;
|
---|
3457 | }
|
---|
3458 | #endif
|
---|
3459 |
|
---|
3460 | static void hide_special_symbols(struct obj_file *f)
|
---|
3461 | {
|
---|
3462 | static const char *const specials[] = {
|
---|
3463 | SPFX "cleanup_module",
|
---|
3464 | SPFX "init_module",
|
---|
3465 | SPFX "kernel_version",
|
---|
3466 | NULL
|
---|
3467 | };
|
---|
3468 |
|
---|
3469 | struct obj_symbol *sym;
|
---|
3470 | const char *const *p;
|
---|
3471 |
|
---|
3472 | for (p = specials; *p; ++p) {
|
---|
3473 | sym = obj_find_symbol(f, *p);
|
---|
3474 | if (sym != NULL)
|
---|
3475 | sym->info = ELF_ST_INFO(STB_LOCAL, ELF_ST_TYPE(sym->info));
|
---|
3476 | }
|
---|
3477 | }
|
---|
3478 |
|
---|
3479 |
|
---|
3480 | #if ENABLE_FEATURE_CHECK_TAINTED_MODULE
|
---|
3481 | static int obj_gpl_license(struct obj_file *f, const char **license)
|
---|
3482 | {
|
---|
3483 | struct obj_section *sec;
|
---|
3484 | /* This list must match *exactly* the list of allowable licenses in
|
---|
3485 | * linux/include/linux/module.h. Checking for leading "GPL" will not
|
---|
3486 | * work, somebody will use "GPL sucks, this is proprietary".
|
---|
3487 | */
|
---|
3488 | static const char *const gpl_licenses[] = {
|
---|
3489 | "GPL",
|
---|
3490 | "GPL v2",
|
---|
3491 | "GPL and additional rights",
|
---|
3492 | "Dual BSD/GPL",
|
---|
3493 | "Dual MPL/GPL"
|
---|
3494 | };
|
---|
3495 |
|
---|
3496 | sec = obj_find_section(f, ".modinfo");
|
---|
3497 | if (sec) {
|
---|
3498 | const char *value, *ptr, *endptr;
|
---|
3499 | ptr = sec->contents;
|
---|
3500 | endptr = ptr + sec->header.sh_size;
|
---|
3501 | while (ptr < endptr) {
|
---|
3502 | value = strchr(ptr, '=');
|
---|
3503 | if (value && strncmp(ptr, "license", value-ptr) == 0) {
|
---|
3504 | unsigned i;
|
---|
3505 | if (license)
|
---|
3506 | *license = value+1;
|
---|
3507 | for (i = 0; i < ARRAY_SIZE(gpl_licenses); ++i) {
|
---|
3508 | if (strcmp(value+1, gpl_licenses[i]) == 0)
|
---|
3509 | return 0;
|
---|
3510 | }
|
---|
3511 | return 2;
|
---|
3512 | }
|
---|
3513 | ptr = strchr(ptr, '\0');
|
---|
3514 | if (ptr)
|
---|
3515 | ptr++;
|
---|
3516 | else
|
---|
3517 | ptr = endptr;
|
---|
3518 | }
|
---|
3519 | }
|
---|
3520 | return 1;
|
---|
3521 | }
|
---|
3522 |
|
---|
3523 | #define TAINT_FILENAME "/proc/sys/kernel/tainted"
|
---|
3524 | #define TAINT_PROPRIETORY_MODULE (1 << 0)
|
---|
3525 | #define TAINT_FORCED_MODULE (1 << 1)
|
---|
3526 | #define TAINT_UNSAFE_SMP (1 << 2)
|
---|
3527 | #define TAINT_URL "http://www.tux.org/lkml/#export-tainted"
|
---|
3528 |
|
---|
3529 | static void set_tainted(int fd, const char *m_name,
|
---|
3530 | int kernel_has_tainted, int taint,
|
---|
3531 | const char *text1, const char *text2)
|
---|
3532 | {
|
---|
3533 | static smallint printed_info;
|
---|
3534 |
|
---|
3535 | char buf[80];
|
---|
3536 | int oldval;
|
---|
3537 |
|
---|
3538 | if (fd < 0 && !kernel_has_tainted)
|
---|
3539 | return; /* New modutils on old kernel */
|
---|
3540 | printf("Warning: loading %s will taint the kernel: %s%s\n",
|
---|
3541 | m_name, text1, text2);
|
---|
3542 | if (!printed_info) {
|
---|
3543 | printf(" See %s for information about tainted modules\n", TAINT_URL);
|
---|
3544 | printed_info = 1;
|
---|
3545 | }
|
---|
3546 | if (fd >= 0) {
|
---|
3547 | read(fd, buf, sizeof(buf)-1);
|
---|
3548 | buf[sizeof(buf)-1] = '\0';
|
---|
3549 | oldval = strtoul(buf, NULL, 10);
|
---|
3550 | sprintf(buf, "%d\n", oldval | taint);
|
---|
3551 | xwrite_str(fd, buf);
|
---|
3552 | }
|
---|
3553 | }
|
---|
3554 |
|
---|
3555 | /* Check if loading this module will taint the kernel. */
|
---|
3556 | static void check_tainted_module(struct obj_file *f, const char *m_name)
|
---|
3557 | {
|
---|
3558 | int fd, kernel_has_tainted;
|
---|
3559 | const char *ptr;
|
---|
3560 |
|
---|
3561 | kernel_has_tainted = 1;
|
---|
3562 | fd = open(TAINT_FILENAME, O_RDWR);
|
---|
3563 | if (fd < 0) {
|
---|
3564 | if (errno == ENOENT)
|
---|
3565 | kernel_has_tainted = 0;
|
---|
3566 | else if (errno == EACCES)
|
---|
3567 | kernel_has_tainted = 1;
|
---|
3568 | else {
|
---|
3569 | bb_simple_perror_msg(TAINT_FILENAME);
|
---|
3570 | kernel_has_tainted = 0;
|
---|
3571 | }
|
---|
3572 | }
|
---|
3573 |
|
---|
3574 | switch (obj_gpl_license(f, &ptr)) {
|
---|
3575 | case 0:
|
---|
3576 | break;
|
---|
3577 | case 1:
|
---|
3578 | set_tainted(fd, m_name, kernel_has_tainted, TAINT_PROPRIETORY_MODULE, "no license", "");
|
---|
3579 | break;
|
---|
3580 | default: /* case 2: */
|
---|
3581 | /* The module has a non-GPL license so we pretend that the
|
---|
3582 | * kernel always has a taint flag to get a warning even on
|
---|
3583 | * kernels without the proc flag.
|
---|
3584 | */
|
---|
3585 | set_tainted(fd, m_name, 1, TAINT_PROPRIETORY_MODULE, "non-GPL license - ", ptr);
|
---|
3586 | break;
|
---|
3587 | }
|
---|
3588 |
|
---|
3589 | if (flag_force_load)
|
---|
3590 | set_tainted(fd, m_name, 1, TAINT_FORCED_MODULE, "forced load", "");
|
---|
3591 |
|
---|
3592 | if (fd >= 0)
|
---|
3593 | close(fd);
|
---|
3594 | }
|
---|
3595 | #else /* !FEATURE_CHECK_TAINTED_MODULE */
|
---|
3596 | #define check_tainted_module(x, y) do { } while (0);
|
---|
3597 | #endif
|
---|
3598 |
|
---|
3599 | #if ENABLE_FEATURE_INSMOD_KSYMOOPS_SYMBOLS
|
---|
3600 | /* add module source, timestamp, kernel version and a symbol for the
|
---|
3601 | * start of some sections. this info is used by ksymoops to do better
|
---|
3602 | * debugging.
|
---|
3603 | */
|
---|
3604 | #if !ENABLE_FEATURE_INSMOD_VERSION_CHECKING
|
---|
3605 | #define get_module_version(f, str) get_module_version(str)
|
---|
3606 | #endif
|
---|
3607 | static int
|
---|
3608 | get_module_version(struct obj_file *f, char str[STRVERSIONLEN])
|
---|
3609 | {
|
---|
3610 | #if ENABLE_FEATURE_INSMOD_VERSION_CHECKING
|
---|
3611 | return new_get_module_version(f, str);
|
---|
3612 | #else
|
---|
3613 | strncpy(str, "???", sizeof(str));
|
---|
3614 | return -1;
|
---|
3615 | #endif
|
---|
3616 | }
|
---|
3617 |
|
---|
3618 | /* add module source, timestamp, kernel version and a symbol for the
|
---|
3619 | * start of some sections. this info is used by ksymoops to do better
|
---|
3620 | * debugging.
|
---|
3621 | */
|
---|
3622 | static void
|
---|
3623 | add_ksymoops_symbols(struct obj_file *f, const char *filename,
|
---|
3624 | const char *m_name)
|
---|
3625 | {
|
---|
3626 | static const char symprefix[] ALIGN1 = "__insmod_";
|
---|
3627 | static const char section_names[][8] = {
|
---|
3628 | ".text",
|
---|
3629 | ".rodata",
|
---|
3630 | ".data",
|
---|
3631 | ".bss",
|
---|
3632 | ".sbss"
|
---|
3633 | };
|
---|
3634 |
|
---|
3635 | struct obj_section *sec;
|
---|
3636 | struct obj_symbol *sym;
|
---|
3637 | char *name, *absolute_filename;
|
---|
3638 | char str[STRVERSIONLEN];
|
---|
3639 | unsigned i;
|
---|
3640 | int lm_name, lfilename, use_ksymtab, version;
|
---|
3641 | struct stat statbuf;
|
---|
3642 |
|
---|
3643 | /* WARNING: was using realpath, but replaced by readlink to stop using
|
---|
3644 | * lots of stack. But here it seems to be able to cause problems? */
|
---|
3645 | absolute_filename = xmalloc_readlink(filename);
|
---|
3646 | if (!absolute_filename)
|
---|
3647 | absolute_filename = xstrdup(filename);
|
---|
3648 |
|
---|
3649 | lm_name = strlen(m_name);
|
---|
3650 | lfilename = strlen(absolute_filename);
|
---|
3651 |
|
---|
3652 | /* add to ksymtab if it already exists or there is no ksymtab and other symbols
|
---|
3653 | * are not to be exported. otherwise leave ksymtab alone for now, the
|
---|
3654 | * "export all symbols" compatibility code will export these symbols later.
|
---|
3655 | */
|
---|
3656 | use_ksymtab = obj_find_section(f, "__ksymtab") || flag_noexport;
|
---|
3657 |
|
---|
3658 | sec = obj_find_section(f, ".this");
|
---|
3659 | if (sec) {
|
---|
3660 | /* tag the module header with the object name, last modified
|
---|
3661 | * timestamp and module version. worst case for module version
|
---|
3662 | * is 0xffffff, decimal 16777215. putting all three fields in
|
---|
3663 | * one symbol is less readable but saves kernel space.
|
---|
3664 | */
|
---|
3665 | if (stat(absolute_filename, &statbuf) != 0)
|
---|
3666 | statbuf.st_mtime = 0;
|
---|
3667 | version = get_module_version(f, str); /* -1 if not found */
|
---|
3668 | name = xasprintf("%s%s_O%s_M%0*lX_V%d",
|
---|
3669 | symprefix, m_name, absolute_filename,
|
---|
3670 | (int)(2 * sizeof(statbuf.st_mtime)),
|
---|
3671 | (long)statbuf.st_mtime,
|
---|
3672 | version);
|
---|
3673 | sym = obj_add_symbol(f, name, -1,
|
---|
3674 | ELF_ST_INFO(STB_GLOBAL, STT_NOTYPE),
|
---|
3675 | sec->idx, sec->header.sh_addr, 0);
|
---|
3676 | if (use_ksymtab)
|
---|
3677 | new_add_ksymtab(f, sym);
|
---|
3678 | }
|
---|
3679 | free(absolute_filename);
|
---|
3680 | #ifdef _NOT_SUPPORTED_
|
---|
3681 | /* record where the persistent data is going, same address as previous symbol */
|
---|
3682 | if (f->persist) {
|
---|
3683 | name = xasprintf("%s%s_P%s",
|
---|
3684 | symprefix, m_name, f->persist);
|
---|
3685 | sym = obj_add_symbol(f, name, -1, ELF_ST_INFO(STB_GLOBAL, STT_NOTYPE),
|
---|
3686 | sec->idx, sec->header.sh_addr, 0);
|
---|
3687 | if (use_ksymtab)
|
---|
3688 | new_add_ksymtab(f, sym);
|
---|
3689 | }
|
---|
3690 | #endif
|
---|
3691 | /* tag the desired sections if size is non-zero */
|
---|
3692 | for (i = 0; i < ARRAY_SIZE(section_names); ++i) {
|
---|
3693 | sec = obj_find_section(f, section_names[i]);
|
---|
3694 | if (sec && sec->header.sh_size) {
|
---|
3695 | name = xasprintf("%s%s_S%s_L%ld",
|
---|
3696 | symprefix, m_name, sec->name,
|
---|
3697 | (long)sec->header.sh_size);
|
---|
3698 | sym = obj_add_symbol(f, name, -1, ELF_ST_INFO(STB_GLOBAL, STT_NOTYPE),
|
---|
3699 | sec->idx, sec->header.sh_addr, 0);
|
---|
3700 | if (use_ksymtab)
|
---|
3701 | new_add_ksymtab(f, sym);
|
---|
3702 | }
|
---|
3703 | }
|
---|
3704 | }
|
---|
3705 | #endif /* FEATURE_INSMOD_KSYMOOPS_SYMBOLS */
|
---|
3706 |
|
---|
3707 | #if ENABLE_FEATURE_INSMOD_LOAD_MAP
|
---|
3708 | static void print_load_map(struct obj_file *f)
|
---|
3709 | {
|
---|
3710 | struct obj_section *sec;
|
---|
3711 | #if ENABLE_FEATURE_INSMOD_LOAD_MAP_FULL
|
---|
3712 | struct obj_symbol **all, **p;
|
---|
3713 | int i, nsyms;
|
---|
3714 | char *loaded; /* array of booleans */
|
---|
3715 | struct obj_symbol *sym;
|
---|
3716 | #endif
|
---|
3717 | /* Report on the section layout. */
|
---|
3718 | printf("Sections: Size %-*s Align\n",
|
---|
3719 | (int) (2 * sizeof(void *)), "Address");
|
---|
3720 |
|
---|
3721 | for (sec = f->load_order; sec; sec = sec->load_next) {
|
---|
3722 | int a;
|
---|
3723 | unsigned long tmp;
|
---|
3724 |
|
---|
3725 | for (a = -1, tmp = sec->header.sh_addralign; tmp; ++a)
|
---|
3726 | tmp >>= 1;
|
---|
3727 | if (a == -1)
|
---|
3728 | a = 0;
|
---|
3729 |
|
---|
3730 | printf("%-15s %08lx %0*lx 2**%d\n",
|
---|
3731 | sec->name,
|
---|
3732 | (long)sec->header.sh_size,
|
---|
3733 | (int) (2 * sizeof(void *)),
|
---|
3734 | (long)sec->header.sh_addr,
|
---|
3735 | a);
|
---|
3736 | }
|
---|
3737 | #if ENABLE_FEATURE_INSMOD_LOAD_MAP_FULL
|
---|
3738 | /* Quick reference which section indices are loaded. */
|
---|
3739 | i = f->header.e_shnum;
|
---|
3740 | loaded = alloca(i * sizeof(loaded[0]));
|
---|
3741 | while (--i >= 0)
|
---|
3742 | loaded[i] = ((f->sections[i]->header.sh_flags & SHF_ALLOC) != 0);
|
---|
3743 |
|
---|
3744 | /* Collect the symbols we'll be listing. */
|
---|
3745 | for (nsyms = i = 0; i < HASH_BUCKETS; ++i)
|
---|
3746 | for (sym = f->symtab[i]; sym; sym = sym->next)
|
---|
3747 | if (sym->secidx <= SHN_HIRESERVE
|
---|
3748 | && (sym->secidx >= SHN_LORESERVE || loaded[sym->secidx])
|
---|
3749 | ) {
|
---|
3750 | ++nsyms;
|
---|
3751 | }
|
---|
3752 |
|
---|
3753 | all = alloca(nsyms * sizeof(all[0]));
|
---|
3754 |
|
---|
3755 | for (i = 0, p = all; i < HASH_BUCKETS; ++i)
|
---|
3756 | for (sym = f->symtab[i]; sym; sym = sym->next)
|
---|
3757 | if (sym->secidx <= SHN_HIRESERVE
|
---|
3758 | && (sym->secidx >= SHN_LORESERVE || loaded[sym->secidx])
|
---|
3759 | ) {
|
---|
3760 | *p++ = sym;
|
---|
3761 | }
|
---|
3762 |
|
---|
3763 | /* And list them. */
|
---|
3764 | printf("\nSymbols:\n");
|
---|
3765 | for (p = all; p < all + nsyms; ++p) {
|
---|
3766 | char type = '?';
|
---|
3767 | unsigned long value;
|
---|
3768 |
|
---|
3769 | sym = *p;
|
---|
3770 | if (sym->secidx == SHN_ABS) {
|
---|
3771 | type = 'A';
|
---|
3772 | value = sym->value;
|
---|
3773 | } else if (sym->secidx == SHN_UNDEF) {
|
---|
3774 | type = 'U';
|
---|
3775 | value = 0;
|
---|
3776 | } else {
|
---|
3777 | sec = f->sections[sym->secidx];
|
---|
3778 |
|
---|
3779 | if (sec->header.sh_type == SHT_NOBITS)
|
---|
3780 | type = 'B';
|
---|
3781 | else if (sec->header.sh_flags & SHF_ALLOC) {
|
---|
3782 | if (sec->header.sh_flags & SHF_EXECINSTR)
|
---|
3783 | type = 'T';
|
---|
3784 | else if (sec->header.sh_flags & SHF_WRITE)
|
---|
3785 | type = 'D';
|
---|
3786 | else
|
---|
3787 | type = 'R';
|
---|
3788 | }
|
---|
3789 | value = sym->value + sec->header.sh_addr;
|
---|
3790 | }
|
---|
3791 |
|
---|
3792 | if (ELF_ST_BIND(sym->info) == STB_LOCAL)
|
---|
3793 | type |= 0x20; /* tolower. safe for '?' too */
|
---|
3794 |
|
---|
3795 | printf("%0*lx %c %s\n", (int) (2 * sizeof(void *)), value,
|
---|
3796 | type, sym->name);
|
---|
3797 | }
|
---|
3798 | #endif
|
---|
3799 | }
|
---|
3800 | #else /* !FEATURE_INSMOD_LOAD_MAP */
|
---|
3801 | static void print_load_map(struct obj_file *f UNUSED_PARAM)
|
---|
3802 | {
|
---|
3803 | }
|
---|
3804 | #endif
|
---|
3805 |
|
---|
3806 | int FAST_FUNC bb_init_module_24(const char *m_filename, const char *options)
|
---|
3807 | {
|
---|
3808 | int k_crcs;
|
---|
3809 | unsigned long m_size;
|
---|
3810 | ElfW(Addr) m_addr;
|
---|
3811 | struct obj_file *f;
|
---|
3812 | int exit_status = EXIT_FAILURE;
|
---|
3813 | char *m_name;
|
---|
3814 | #if ENABLE_FEATURE_INSMOD_VERSION_CHECKING
|
---|
3815 | int m_has_modinfo;
|
---|
3816 | #endif
|
---|
3817 | char *image;
|
---|
3818 | size_t image_size;
|
---|
3819 | bool mmaped;
|
---|
3820 |
|
---|
3821 | image_size = INT_MAX - 4095;
|
---|
3822 | mmaped = 0;
|
---|
3823 | image = try_to_mmap_module(m_filename, &image_size);
|
---|
3824 | if (image) {
|
---|
3825 | mmaped = 1;
|
---|
3826 | } else {
|
---|
3827 | /* Load module into memory and unzip if compressed */
|
---|
3828 | image = xmalloc_open_zipped_read_close(m_filename, &image_size);
|
---|
3829 | if (!image)
|
---|
3830 | return EXIT_FAILURE;
|
---|
3831 | }
|
---|
3832 |
|
---|
3833 | m_name = xstrdup(bb_basename(m_filename));
|
---|
3834 | /* "module.o[.gz]" -> "module" */
|
---|
3835 | *strchrnul(m_name, '.') = '\0';
|
---|
3836 |
|
---|
3837 | f = obj_load(image, image_size, LOADBITS);
|
---|
3838 |
|
---|
3839 | #if ENABLE_FEATURE_INSMOD_VERSION_CHECKING
|
---|
3840 | /* Version correspondence? */
|
---|
3841 | m_has_modinfo = (get_modinfo_value(f, "kernel_version") != NULL);
|
---|
3842 | if (!flag_quiet) {
|
---|
3843 | char m_strversion[STRVERSIONLEN];
|
---|
3844 | struct utsname uts;
|
---|
3845 |
|
---|
3846 | if (m_has_modinfo) {
|
---|
3847 | int m_version = new_get_module_version(f, m_strversion);
|
---|
3848 | if (m_version == -1) {
|
---|
3849 | bb_error_msg_and_die("can't find the kernel version "
|
---|
3850 | "the module was compiled for");
|
---|
3851 | }
|
---|
3852 | }
|
---|
3853 |
|
---|
3854 | uname(&uts);
|
---|
3855 | if (strncmp(uts.release, m_strversion, STRVERSIONLEN) != 0) {
|
---|
3856 | bb_error_msg("%skernel-module version mismatch\n"
|
---|
3857 | "\t%s was compiled for kernel version %s\n"
|
---|
3858 | "\twhile this kernel is version %s",
|
---|
3859 | flag_force_load ? "warning: " : "",
|
---|
3860 | m_name, m_strversion, uts.release);
|
---|
3861 | if (!flag_force_load)
|
---|
3862 | goto out;
|
---|
3863 | }
|
---|
3864 | }
|
---|
3865 | #endif
|
---|
3866 |
|
---|
3867 | if (query_module(NULL, 0, NULL, 0, NULL))
|
---|
3868 | bb_error_msg_and_die("old (unsupported) kernel");
|
---|
3869 | new_get_kernel_symbols();
|
---|
3870 | k_crcs = new_is_kernel_checksummed();
|
---|
3871 |
|
---|
3872 | #if ENABLE_FEATURE_INSMOD_VERSION_CHECKING
|
---|
3873 | {
|
---|
3874 | int m_crcs = 0;
|
---|
3875 | if (m_has_modinfo)
|
---|
3876 | m_crcs = new_is_module_checksummed(f);
|
---|
3877 | if (m_crcs != k_crcs)
|
---|
3878 | obj_set_symbol_compare(f, ncv_strcmp, ncv_symbol_hash);
|
---|
3879 | }
|
---|
3880 | #endif
|
---|
3881 |
|
---|
3882 | /* Let the module know about the kernel symbols. */
|
---|
3883 | add_kernel_symbols(f);
|
---|
3884 |
|
---|
3885 | /* Allocate common symbols, symbol tables, and string tables. */
|
---|
3886 | new_create_this_module(f, m_name);
|
---|
3887 | obj_check_undefineds(f);
|
---|
3888 | obj_allocate_commons(f);
|
---|
3889 | check_tainted_module(f, m_name);
|
---|
3890 |
|
---|
3891 | /* Done with the module name, on to the optional var=value arguments */
|
---|
3892 | new_process_module_arguments(f, options);
|
---|
3893 |
|
---|
3894 | arch_create_got(f);
|
---|
3895 | hide_special_symbols(f);
|
---|
3896 |
|
---|
3897 | #if ENABLE_FEATURE_INSMOD_KSYMOOPS_SYMBOLS
|
---|
3898 | add_ksymoops_symbols(f, m_filename, m_name);
|
---|
3899 | #endif
|
---|
3900 |
|
---|
3901 | new_create_module_ksymtab(f);
|
---|
3902 |
|
---|
3903 | /* Find current size of the module */
|
---|
3904 | m_size = obj_load_size(f);
|
---|
3905 |
|
---|
3906 | m_addr = create_module(m_name, m_size);
|
---|
3907 | if (m_addr == (ElfW(Addr))(-1)) switch (errno) {
|
---|
3908 | case EEXIST:
|
---|
3909 | bb_error_msg_and_die("a module named %s already exists", m_name);
|
---|
3910 | case ENOMEM:
|
---|
3911 | bb_error_msg_and_die("can't allocate kernel memory for module; needed %lu bytes",
|
---|
3912 | m_size);
|
---|
3913 | default:
|
---|
3914 | bb_perror_msg_and_die("create_module: %s", m_name);
|
---|
3915 | }
|
---|
3916 |
|
---|
3917 | #if !LOADBITS
|
---|
3918 | /*
|
---|
3919 | * the PROGBITS section was not loaded by the obj_load
|
---|
3920 | * now we can load them directly into the kernel memory
|
---|
3921 | */
|
---|
3922 | if (!obj_load_progbits(image, image_size, f, (char*)m_addr)) {
|
---|
3923 | delete_module(m_name, 0);
|
---|
3924 | goto out;
|
---|
3925 | }
|
---|
3926 | #endif
|
---|
3927 |
|
---|
3928 | if (!obj_relocate(f, m_addr)) {
|
---|
3929 | delete_module(m_name, 0);
|
---|
3930 | goto out;
|
---|
3931 | }
|
---|
3932 |
|
---|
3933 | if (!new_init_module(m_name, f, m_size)) {
|
---|
3934 | delete_module(m_name, 0);
|
---|
3935 | goto out;
|
---|
3936 | }
|
---|
3937 |
|
---|
3938 | if (flag_print_load_map)
|
---|
3939 | print_load_map(f);
|
---|
3940 |
|
---|
3941 | exit_status = EXIT_SUCCESS;
|
---|
3942 |
|
---|
3943 | out:
|
---|
3944 | if (mmaped)
|
---|
3945 | munmap(image, image_size);
|
---|
3946 | else
|
---|
3947 | free(image);
|
---|
3948 | free(m_name);
|
---|
3949 |
|
---|
3950 | return exit_status;
|
---|
3951 | }
|
---|