FreeBSD kernel kern code
link_elf_obj.c
Go to the documentation of this file.
1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 1998-2000 Doug Rabson
5 * Copyright (c) 2004 Peter Wemm
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#include <sys/cdefs.h>
31__FBSDID("$FreeBSD$");
32
33#include "opt_ddb.h"
34
35#include <sys/param.h>
36#include <sys/systm.h>
37#include <sys/fcntl.h>
38#include <sys/kernel.h>
39#include <sys/lock.h>
40#include <sys/malloc.h>
41#include <sys/linker.h>
42#include <sys/mutex.h>
43#include <sys/mount.h>
44#include <sys/namei.h>
45#include <sys/proc.h>
46#include <sys/rwlock.h>
47#include <sys/sysctl.h>
48#include <sys/vnode.h>
49
50#include <machine/elf.h>
51
52#include <net/vnet.h>
53
54#include <security/mac/mac_framework.h>
55
56#include <vm/vm.h>
57#include <vm/vm_param.h>
58#include <vm/pmap.h>
59#include <vm/vm_extern.h>
60#include <vm/vm_kern.h>
61#include <vm/vm_map.h>
62#include <vm/vm_object.h>
63#include <vm/vm_page.h>
64#include <vm/vm_pager.h>
65
66#include <sys/link_elf.h>
67
68#ifdef DDB_CTF
69#include <contrib/zlib/zlib.h>
70#endif
71
72#include "linker_if.h"
73
74typedef struct {
75 void *addr;
76 Elf_Off size;
77 int flags; /* Section flags. */
78 int sec; /* Original section number. */
79 char *name;
80} Elf_progent;
81
82typedef struct {
83 Elf_Rel *rel;
84 int nrel;
85 int sec;
86} Elf_relent;
87
88typedef struct {
89 Elf_Rela *rela;
90 int nrela;
91 int sec;
92} Elf_relaent;
93
94typedef struct elf_file {
95 struct linker_file lf; /* Common fields */
96
97 int preloaded;
98 caddr_t address; /* Relocation address */
99 vm_object_t object; /* VM object to hold file pages */
100 Elf_Shdr *e_shdr;
101
102 Elf_progent *progtab;
103 u_int nprogtab;
104
105 Elf_relaent *relatab;
106 u_int nrelatab;
107
108 Elf_relent *reltab;
109 int nreltab;
110
111 Elf_Sym *ddbsymtab; /* The symbol table we are using */
112 long ddbsymcnt; /* Number of symbols */
113 caddr_t ddbstrtab; /* String table */
114 long ddbstrcnt; /* number of bytes in string table */
115
116 caddr_t shstrtab; /* Section name string table */
117 long shstrcnt; /* number of bytes in string table */
118
119 caddr_t ctftab; /* CTF table */
120 long ctfcnt; /* number of bytes in CTF table */
121 caddr_t ctfoff; /* CTF offset table */
122 caddr_t typoff; /* Type offset table */
123 long typlen; /* Number of type entries. */
124
125} *elf_file_t;
126
127#include <kern/kern_ctf.c>
128
129static int link_elf_link_preload(linker_class_t cls,
130 const char *, linker_file_t *);
131static int link_elf_link_preload_finish(linker_file_t);
132static int link_elf_load_file(linker_class_t, const char *, linker_file_t *);
133static int link_elf_lookup_symbol(linker_file_t, const char *,
134 c_linker_sym_t *);
135static int link_elf_lookup_debug_symbol(linker_file_t, const char *,
136 c_linker_sym_t *);
137static int link_elf_symbol_values(linker_file_t, c_linker_sym_t,
138 linker_symval_t *);
139static int link_elf_debug_symbol_values(linker_file_t, c_linker_sym_t,
140 linker_symval_t *);
141static int link_elf_search_symbol(linker_file_t, caddr_t value,
142 c_linker_sym_t *sym, long *diffp);
143
144static void link_elf_unload_file(linker_file_t);
145static int link_elf_lookup_set(linker_file_t, const char *,
146 void ***, void ***, int *);
147static int link_elf_each_function_name(linker_file_t,
148 int (*)(const char *, void *), void *);
149static int link_elf_each_function_nameval(linker_file_t,
150 linker_function_nameval_callback_t,
151 void *);
152static int link_elf_reloc_local(linker_file_t, bool);
153static long link_elf_symtab_get(linker_file_t, const Elf_Sym **);
154static long link_elf_strtab_get(linker_file_t, caddr_t *);
155
156static int elf_obj_lookup(linker_file_t lf, Elf_Size symidx, int deps,
157 Elf_Addr *);
158
159static kobj_method_t link_elf_methods[] = {
160 KOBJMETHOD(linker_lookup_symbol, link_elf_lookup_symbol),
161 KOBJMETHOD(linker_lookup_debug_symbol, link_elf_lookup_debug_symbol),
162 KOBJMETHOD(linker_symbol_values, link_elf_symbol_values),
163 KOBJMETHOD(linker_debug_symbol_values, link_elf_debug_symbol_values),
164 KOBJMETHOD(linker_search_symbol, link_elf_search_symbol),
165 KOBJMETHOD(linker_unload, link_elf_unload_file),
166 KOBJMETHOD(linker_load_file, link_elf_load_file),
167 KOBJMETHOD(linker_link_preload, link_elf_link_preload),
168 KOBJMETHOD(linker_link_preload_finish, link_elf_link_preload_finish),
169 KOBJMETHOD(linker_lookup_set, link_elf_lookup_set),
170 KOBJMETHOD(linker_each_function_name, link_elf_each_function_name),
171 KOBJMETHOD(linker_each_function_nameval, link_elf_each_function_nameval),
172 KOBJMETHOD(linker_ctf_get, link_elf_ctf_get),
173 KOBJMETHOD(linker_symtab_get, link_elf_symtab_get),
174 KOBJMETHOD(linker_strtab_get, link_elf_strtab_get),
175 KOBJMETHOD_END
176};
177
178static struct linker_class link_elf_class = {
179#if ELF_TARG_CLASS == ELFCLASS32
180 "elf32_obj",
181#else
182 "elf64_obj",
183#endif
184 link_elf_methods, sizeof(struct elf_file)
185};
186
187static bool link_elf_obj_leak_locals = true;
188SYSCTL_BOOL(_debug, OID_AUTO, link_elf_obj_leak_locals,
189 CTLFLAG_RWTUN, &link_elf_obj_leak_locals, 0,
190 "Allow local symbols to participate in global module symbol resolution");
191
192static int relocate_file(elf_file_t ef);
193static void elf_obj_cleanup_globals_cache(elf_file_t);
194
195static void
196link_elf_error(const char *filename, const char *s)
197{
198 if (filename == NULL)
199 printf("kldload: %s\n", s);
200 else
201 printf("kldload: %s: %s\n", filename, s);
202}
203
204static void
205link_elf_init(void *arg)
206{
207
208 linker_add_class(&link_elf_class);
209}
210SYSINIT(link_elf_obj, SI_SUB_KLD, SI_ORDER_SECOND, link_elf_init, NULL);
211
212static void
213link_elf_protect_range(elf_file_t ef, vm_offset_t start, vm_offset_t end,
214 vm_prot_t prot)
215{
216 int error __unused;
217
218 KASSERT(start <= end && start >= (vm_offset_t)ef->address &&
219 end <= round_page((vm_offset_t)ef->address + ef->lf.size),
220 ("link_elf_protect_range: invalid range %#jx-%#jx",
221 (uintmax_t)start, (uintmax_t)end));
222
223 if (start == end)
224 return;
225 if (ef->preloaded) {
226#ifdef __amd64__
227 error = pmap_change_prot(start, end - start, prot);
228 KASSERT(error == 0,
229 ("link_elf_protect_range: pmap_change_prot() returned %d",
230 error));
231#endif
232 return;
233 }
234 error = vm_map_protect(kernel_map, start, end, prot, 0,
235 VM_MAP_PROTECT_SET_PROT);
236 KASSERT(error == KERN_SUCCESS,
237 ("link_elf_protect_range: vm_map_protect() returned %d", error));
238}
239
240/*
241 * Restrict permissions on linker file memory based on section flags.
242 * Sections need not be page-aligned, so overlap within a page is possible.
243 */
244static void
245link_elf_protect(elf_file_t ef)
246{
247 vm_offset_t end, segend, segstart, start;
248 vm_prot_t gapprot, prot, segprot;
249 int i;
250
251 /*
252 * If the file was preloaded, the last page may contain other preloaded
253 * data which may need to be writeable. ELF files are always
254 * page-aligned, but other preloaded data, such as entropy or CPU
255 * microcode may be loaded with a smaller alignment.
256 */
257 gapprot = ef->preloaded ? VM_PROT_RW : VM_PROT_READ;
258
259 start = end = (vm_offset_t)ef->address;
260 prot = VM_PROT_READ;
261 for (i = 0; i < ef->nprogtab; i++) {
262 /*
263 * VNET and DPCPU sections have their memory allocated by their
264 * respective subsystems.
265 */
266 if (ef->progtab[i].name != NULL && (
267#ifdef VIMAGE
268 strcmp(ef->progtab[i].name, VNET_SETNAME) == 0 ||
269#endif
270 strcmp(ef->progtab[i].name, DPCPU_SETNAME) == 0))
271 continue;
272
273 segstart = trunc_page((vm_offset_t)ef->progtab[i].addr);
274 segend = round_page((vm_offset_t)ef->progtab[i].addr +
275 ef->progtab[i].size);
276 segprot = VM_PROT_READ;
277 if ((ef->progtab[i].flags & SHF_WRITE) != 0)
278 segprot |= VM_PROT_WRITE;
279 if ((ef->progtab[i].flags & SHF_EXECINSTR) != 0)
280 segprot |= VM_PROT_EXECUTE;
281
282 if (end <= segstart) {
283 /*
284 * Case 1: there is no overlap between the previous
285 * segment and this one. Apply protections to the
286 * previous segment, and protect the gap between the
287 * previous and current segments, if any.
288 */
289 link_elf_protect_range(ef, start, end, prot);
290 link_elf_protect_range(ef, end, segstart, gapprot);
291
292 start = segstart;
293 end = segend;
294 prot = segprot;
295 } else if (start < segstart && end == segend) {
296 /*
297 * Case 2: the current segment is a subrange of the
298 * previous segment. Apply protections to the
299 * non-overlapping portion of the previous segment.
300 */
301 link_elf_protect_range(ef, start, segstart, prot);
302
303 start = segstart;
304 prot |= segprot;
305 } else if (end < segend) {
306 /*
307 * Case 3: there is partial overlap between the previous
308 * and current segments. Apply protections to the
309 * non-overlapping portion of the previous segment, and
310 * then the overlap, which must use the union of the two
311 * segments' protections.
312 */
313 link_elf_protect_range(ef, start, segstart, prot);
314 link_elf_protect_range(ef, segstart, end,
315 prot | segprot);
316 start = end;
317 end = segend;
318 prot = segprot;
319 } else {
320 /*
321 * Case 4: the two segments reside in the same page.
322 */
323 prot |= segprot;
324 }
325 }
326
327 /*
328 * Fix up the last unprotected segment and trailing data.
329 */
330 link_elf_protect_range(ef, start, end, prot);
331 link_elf_protect_range(ef, end,
332 round_page((vm_offset_t)ef->address + ef->lf.size), gapprot);
333}
334
335static int
336link_elf_link_preload(linker_class_t cls, const char *filename,
337 linker_file_t *result)
338{
339 Elf_Ehdr *hdr;
340 Elf_Shdr *shdr;
341 Elf_Sym *es;
342 void *modptr, *baseptr, *sizeptr;
343 char *type;
344 elf_file_t ef;
345 linker_file_t lf;
346 Elf_Addr off;
347 int error, i, j, pb, ra, rl, shstrindex, symstrindex, symtabindex;
348
349 /* Look to see if we have the file preloaded */
350 modptr = preload_search_by_name(filename);
351 if (modptr == NULL)
352 return ENOENT;
353
354 type = (char *)preload_search_info(modptr, MODINFO_TYPE);
355 baseptr = preload_search_info(modptr, MODINFO_ADDR);
356 sizeptr = preload_search_info(modptr, MODINFO_SIZE);
357 hdr = (Elf_Ehdr *)preload_search_info(modptr, MODINFO_METADATA |
358 MODINFOMD_ELFHDR);
359 shdr = (Elf_Shdr *)preload_search_info(modptr, MODINFO_METADATA |
360 MODINFOMD_SHDR);
361 if (type == NULL || (strcmp(type, "elf" __XSTRING(__ELF_WORD_SIZE)
362 " obj module") != 0 &&
363 strcmp(type, "elf obj module") != 0)) {
364 return (EFTYPE);
365 }
366 if (baseptr == NULL || sizeptr == NULL || hdr == NULL ||
367 shdr == NULL)
368 return (EINVAL);
369
370 lf = linker_make_file(filename, &link_elf_class);
371 if (lf == NULL)
372 return (ENOMEM);
373
374 ef = (elf_file_t)lf;
375 ef->preloaded = 1;
376 ef->address = *(caddr_t *)baseptr;
377 lf->address = *(caddr_t *)baseptr;
378 lf->size = *(size_t *)sizeptr;
379
380 if (hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS ||
381 hdr->e_ident[EI_DATA] != ELF_TARG_DATA ||
382 hdr->e_ident[EI_VERSION] != EV_CURRENT ||
383 hdr->e_version != EV_CURRENT ||
384 hdr->e_type != ET_REL ||
385 hdr->e_machine != ELF_TARG_MACH) {
386 error = EFTYPE;
387 goto out;
388 }
389 ef->e_shdr = shdr;
390
391 /* Scan the section header for information and table sizing. */
392 symtabindex = -1;
393 symstrindex = -1;
394 for (i = 0; i < hdr->e_shnum; i++) {
395 switch (shdr[i].sh_type) {
396 case SHT_PROGBITS:
397 case SHT_NOBITS:
398#ifdef __amd64__
399 case SHT_X86_64_UNWIND:
400#endif
401 case SHT_INIT_ARRAY:
402 case SHT_FINI_ARRAY:
403 /* Ignore sections not loaded by the loader. */
404 if (shdr[i].sh_addr == 0)
405 break;
406 ef->nprogtab++;
407 break;
408 case SHT_SYMTAB:
409 symtabindex = i;
410 symstrindex = shdr[i].sh_link;
411 break;
412 case SHT_REL:
413 /*
414 * Ignore relocation tables for sections not
415 * loaded by the loader.
416 */
417 if (shdr[shdr[i].sh_info].sh_addr == 0)
418 break;
419 ef->nreltab++;
420 break;
421 case SHT_RELA:
422 if (shdr[shdr[i].sh_info].sh_addr == 0)
423 break;
424 ef->nrelatab++;
425 break;
426 }
427 }
428
429 shstrindex = hdr->e_shstrndx;
430 if (ef->nprogtab == 0 || symstrindex < 0 ||
431 symstrindex >= hdr->e_shnum ||
432 shdr[symstrindex].sh_type != SHT_STRTAB || shstrindex == 0 ||
433 shstrindex >= hdr->e_shnum ||
434 shdr[shstrindex].sh_type != SHT_STRTAB) {
435 printf("%s: bad/missing section headers\n", filename);
436 error = ENOEXEC;
437 goto out;
438 }
439
440 /* Allocate space for tracking the load chunks */
441 if (ef->nprogtab != 0)
442 ef->progtab = malloc(ef->nprogtab * sizeof(*ef->progtab),
443 M_LINKER, M_WAITOK | M_ZERO);
444 if (ef->nreltab != 0)
445 ef->reltab = malloc(ef->nreltab * sizeof(*ef->reltab),
446 M_LINKER, M_WAITOK | M_ZERO);
447 if (ef->nrelatab != 0)
448 ef->relatab = malloc(ef->nrelatab * sizeof(*ef->relatab),
449 M_LINKER, M_WAITOK | M_ZERO);
450 if ((ef->nprogtab != 0 && ef->progtab == NULL) ||
451 (ef->nreltab != 0 && ef->reltab == NULL) ||
452 (ef->nrelatab != 0 && ef->relatab == NULL)) {
453 error = ENOMEM;
454 goto out;
455 }
456
457 /* XXX, relocate the sh_addr fields saved by the loader. */
458 off = 0;
459 for (i = 0; i < hdr->e_shnum; i++) {
460 if (shdr[i].sh_addr != 0 && (off == 0 || shdr[i].sh_addr < off))
461 off = shdr[i].sh_addr;
462 }
463 for (i = 0; i < hdr->e_shnum; i++) {
464 if (shdr[i].sh_addr != 0)
465 shdr[i].sh_addr = shdr[i].sh_addr - off +
466 (Elf_Addr)ef->address;
467 }
468
469 ef->ddbsymcnt = shdr[symtabindex].sh_size / sizeof(Elf_Sym);
470 ef->ddbsymtab = (Elf_Sym *)shdr[symtabindex].sh_addr;
471 ef->ddbstrcnt = shdr[symstrindex].sh_size;
472 ef->ddbstrtab = (char *)shdr[symstrindex].sh_addr;
473 ef->shstrcnt = shdr[shstrindex].sh_size;
474 ef->shstrtab = (char *)shdr[shstrindex].sh_addr;
475
476 /* Now fill out progtab and the relocation tables. */
477 pb = 0;
478 rl = 0;
479 ra = 0;
480 for (i = 0; i < hdr->e_shnum; i++) {
481 switch (shdr[i].sh_type) {
482 case SHT_PROGBITS:
483 case SHT_NOBITS:
484#ifdef __amd64__
485 case SHT_X86_64_UNWIND:
486#endif
487 case SHT_INIT_ARRAY:
488 case SHT_FINI_ARRAY:
489 if (shdr[i].sh_addr == 0)
490 break;
491 ef->progtab[pb].addr = (void *)shdr[i].sh_addr;
492 if (shdr[i].sh_type == SHT_PROGBITS)
493 ef->progtab[pb].name = "<<PROGBITS>>";
494#ifdef __amd64__
495 else if (shdr[i].sh_type == SHT_X86_64_UNWIND)
496 ef->progtab[pb].name = "<<UNWIND>>";
497#endif
498 else if (shdr[i].sh_type == SHT_INIT_ARRAY)
499 ef->progtab[pb].name = "<<INIT_ARRAY>>";
500 else if (shdr[i].sh_type == SHT_FINI_ARRAY)
501 ef->progtab[pb].name = "<<FINI_ARRAY>>";
502 else
503 ef->progtab[pb].name = "<<NOBITS>>";
504 ef->progtab[pb].size = shdr[i].sh_size;
505 ef->progtab[pb].flags = shdr[i].sh_flags;
506 ef->progtab[pb].sec = i;
507 if (ef->shstrtab && shdr[i].sh_name != 0)
508 ef->progtab[pb].name =
509 ef->shstrtab + shdr[i].sh_name;
510 if (ef->progtab[pb].name != NULL &&
511 !strcmp(ef->progtab[pb].name, DPCPU_SETNAME)) {
512 void *dpcpu;
513
514 dpcpu = dpcpu_alloc(shdr[i].sh_size);
515 if (dpcpu == NULL) {
516 printf("%s: pcpu module space is out "
517 "of space; cannot allocate %#jx "
518 "for %s\n", __func__,
519 (uintmax_t)shdr[i].sh_size,
520 filename);
521 error = ENOSPC;
522 goto out;
523 }
524 memcpy(dpcpu, ef->progtab[pb].addr,
525 ef->progtab[pb].size);
526 dpcpu_copy(dpcpu, shdr[i].sh_size);
527 ef->progtab[pb].addr = dpcpu;
528#ifdef VIMAGE
529 } else if (ef->progtab[pb].name != NULL &&
530 !strcmp(ef->progtab[pb].name, VNET_SETNAME)) {
531 void *vnet_data;
532
533 vnet_data = vnet_data_alloc(shdr[i].sh_size);
534 if (vnet_data == NULL) {
535 printf("%s: vnet module space is out "
536 "of space; cannot allocate %#jx "
537 "for %s\n", __func__,
538 (uintmax_t)shdr[i].sh_size,
539 filename);
540 error = ENOSPC;
541 goto out;
542 }
543 memcpy(vnet_data, ef->progtab[pb].addr,
544 ef->progtab[pb].size);
545 vnet_data_copy(vnet_data, shdr[i].sh_size);
546 ef->progtab[pb].addr = vnet_data;
547#endif
548 } else if ((ef->progtab[pb].name != NULL &&
549 strcmp(ef->progtab[pb].name, ".ctors") == 0) ||
550 shdr[i].sh_type == SHT_INIT_ARRAY) {
551 if (lf->ctors_addr != 0) {
552 printf(
553 "%s: multiple ctor sections in %s\n",
554 __func__, filename);
555 } else {
556 lf->ctors_addr = ef->progtab[pb].addr;
557 lf->ctors_size = shdr[i].sh_size;
558 }
559 } else if ((ef->progtab[pb].name != NULL &&
560 strcmp(ef->progtab[pb].name, ".dtors") == 0) ||
561 shdr[i].sh_type == SHT_FINI_ARRAY) {
562 if (lf->dtors_addr != 0) {
563 printf(
564 "%s: multiple dtor sections in %s\n",
565 __func__, filename);
566 } else {
567 lf->dtors_addr = ef->progtab[pb].addr;
568 lf->dtors_size = shdr[i].sh_size;
569 }
570 }
571
572 /* Update all symbol values with the offset. */
573 for (j = 0; j < ef->ddbsymcnt; j++) {
574 es = &ef->ddbsymtab[j];
575 if (es->st_shndx != i)
576 continue;
577 es->st_value += (Elf_Addr)ef->progtab[pb].addr;
578 }
579 pb++;
580 break;
581 case SHT_REL:
582 if (shdr[shdr[i].sh_info].sh_addr == 0)
583 break;
584 ef->reltab[rl].rel = (Elf_Rel *)shdr[i].sh_addr;
585 ef->reltab[rl].nrel = shdr[i].sh_size / sizeof(Elf_Rel);
586 ef->reltab[rl].sec = shdr[i].sh_info;
587 rl++;
588 break;
589 case SHT_RELA:
590 if (shdr[shdr[i].sh_info].sh_addr == 0)
591 break;
592 ef->relatab[ra].rela = (Elf_Rela *)shdr[i].sh_addr;
593 ef->relatab[ra].nrela =
594 shdr[i].sh_size / sizeof(Elf_Rela);
595 ef->relatab[ra].sec = shdr[i].sh_info;
596 ra++;
597 break;
598 }
599 }
600 if (pb != ef->nprogtab) {
601 printf("%s: lost progbits\n", filename);
602 error = ENOEXEC;
603 goto out;
604 }
605 if (rl != ef->nreltab) {
606 printf("%s: lost reltab\n", filename);
607 error = ENOEXEC;
608 goto out;
609 }
610 if (ra != ef->nrelatab) {
611 printf("%s: lost relatab\n", filename);
612 error = ENOEXEC;
613 goto out;
614 }
615
616 /*
617 * The file needs to be writeable and executable while applying
618 * relocations. Mapping protections are applied once relocation
619 * processing is complete.
620 */
621 link_elf_protect_range(ef, (vm_offset_t)ef->address,
622 round_page((vm_offset_t)ef->address + ef->lf.size), VM_PROT_ALL);
623
624 /* Local intra-module relocations */
625 error = link_elf_reloc_local(lf, false);
626 if (error != 0)
627 goto out;
628 *result = lf;
629 return (0);
630
631out:
632 /* preload not done this way */
633 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
634 return (error);
635}
636
637static void
638link_elf_invoke_cbs(caddr_t addr, size_t size)
639{
640 void (**ctor)(void);
641 size_t i, cnt;
642
643 if (addr == NULL || size == 0)
644 return;
645 cnt = size / sizeof(*ctor);
646 ctor = (void *)addr;
647 for (i = 0; i < cnt; i++) {
648 if (ctor[i] != NULL)
649 (*ctor[i])();
650 }
651}
652
653static int
654link_elf_link_preload_finish(linker_file_t lf)
655{
656 elf_file_t ef;
657 int error;
658
659 ef = (elf_file_t)lf;
660 error = relocate_file(ef);
661 if (error)
662 return (error);
663
664 /* Notify MD code that a module is being loaded. */
665 error = elf_cpu_load_file(lf);
666 if (error)
667 return (error);
668
669#if defined(__i386__) || defined(__amd64__)
670 /* Now ifuncs. */
671 error = link_elf_reloc_local(lf, true);
672 if (error != 0)
673 return (error);
674#endif
675
676 /* Apply protections now that relocation processing is complete. */
677 link_elf_protect(ef);
678
679 link_elf_invoke_cbs(lf->ctors_addr, lf->ctors_size);
680 return (0);
681}
682
683static int
684link_elf_load_file(linker_class_t cls, const char *filename,
685 linker_file_t *result)
686{
687 struct nameidata *nd;
688 struct thread *td = curthread; /* XXX */
689 Elf_Ehdr *hdr;
690 Elf_Shdr *shdr;
691 Elf_Sym *es;
692 int nbytes, i, j;
693 vm_offset_t mapbase;
694 size_t mapsize;
695 int error = 0;
696 ssize_t resid;
697 int flags;
698 elf_file_t ef;
699 linker_file_t lf;
700 int symtabindex;
701 int symstrindex;
702 int shstrindex;
703 int nsym;
704 int pb, rl, ra;
705 int alignmask;
706
707 shdr = NULL;
708 lf = NULL;
709 mapsize = 0;
710 hdr = NULL;
711
712 nd = malloc(sizeof(struct nameidata), M_TEMP, M_WAITOK);
713 NDINIT(nd, LOOKUP, FOLLOW, UIO_SYSSPACE, filename);
714 flags = FREAD;
715 error = vn_open(nd, &flags, 0, NULL);
716 if (error) {
717 free(nd, M_TEMP);
718 return error;
719 }
720 NDFREE(nd, NDF_ONLY_PNBUF);
721 if (nd->ni_vp->v_type != VREG) {
722 error = ENOEXEC;
723 goto out;
724 }
725#ifdef MAC
726 error = mac_kld_check_load(td->td_ucred, nd->ni_vp);
727 if (error) {
728 goto out;
729 }
730#endif
731
732 /* Read the elf header from the file. */
733 hdr = malloc(sizeof(*hdr), M_LINKER, M_WAITOK);
734 error = vn_rdwr(UIO_READ, nd->ni_vp, (void *)hdr, sizeof(*hdr), 0,
735 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
736 &resid, td);
737 if (error)
738 goto out;
739 if (resid != 0){
740 error = ENOEXEC;
741 goto out;
742 }
743
744 if (!IS_ELF(*hdr)) {
745 error = ENOEXEC;
746 goto out;
747 }
748
749 if (hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS
750 || hdr->e_ident[EI_DATA] != ELF_TARG_DATA) {
751 link_elf_error(filename, "Unsupported file layout");
752 error = ENOEXEC;
753 goto out;
754 }
755 if (hdr->e_ident[EI_VERSION] != EV_CURRENT
756 || hdr->e_version != EV_CURRENT) {
757 link_elf_error(filename, "Unsupported file version");
758 error = ENOEXEC;
759 goto out;
760 }
761 if (hdr->e_type != ET_REL) {
762 error = ENOSYS;
763 goto out;
764 }
765 if (hdr->e_machine != ELF_TARG_MACH) {
766 link_elf_error(filename, "Unsupported machine");
767 error = ENOEXEC;
768 goto out;
769 }
770
771 lf = linker_make_file(filename, &link_elf_class);
772 if (!lf) {
773 error = ENOMEM;
774 goto out;
775 }
776 ef = (elf_file_t) lf;
777 ef->nprogtab = 0;
778 ef->e_shdr = 0;
779 ef->nreltab = 0;
780 ef->nrelatab = 0;
781
782 /* Allocate and read in the section header */
783 nbytes = hdr->e_shnum * hdr->e_shentsize;
784 if (nbytes == 0 || hdr->e_shoff == 0 ||
785 hdr->e_shentsize != sizeof(Elf_Shdr)) {
786 error = ENOEXEC;
787 goto out;
788 }
789 shdr = malloc(nbytes, M_LINKER, M_WAITOK);
790 ef->e_shdr = shdr;
791 error = vn_rdwr(UIO_READ, nd->ni_vp, (caddr_t)shdr, nbytes,
792 hdr->e_shoff, UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred,
793 NOCRED, &resid, td);
794 if (error)
795 goto out;
796 if (resid) {
797 error = ENOEXEC;
798 goto out;
799 }
800
801 /* Scan the section header for information and table sizing. */
802 nsym = 0;
803 symtabindex = -1;
804 symstrindex = -1;
805 for (i = 0; i < hdr->e_shnum; i++) {
806 if (shdr[i].sh_size == 0)
807 continue;
808 switch (shdr[i].sh_type) {
809 case SHT_PROGBITS:
810 case SHT_NOBITS:
811#ifdef __amd64__
812 case SHT_X86_64_UNWIND:
813#endif
814 case SHT_INIT_ARRAY:
815 case SHT_FINI_ARRAY:
816 if ((shdr[i].sh_flags & SHF_ALLOC) == 0)
817 break;
818 ef->nprogtab++;
819 break;
820 case SHT_SYMTAB:
821 nsym++;
822 symtabindex = i;
823 symstrindex = shdr[i].sh_link;
824 break;
825 case SHT_REL:
826 /*
827 * Ignore relocation tables for unallocated
828 * sections.
829 */
830 if ((shdr[shdr[i].sh_info].sh_flags & SHF_ALLOC) == 0)
831 break;
832 ef->nreltab++;
833 break;
834 case SHT_RELA:
835 if ((shdr[shdr[i].sh_info].sh_flags & SHF_ALLOC) == 0)
836 break;
837 ef->nrelatab++;
838 break;
839 case SHT_STRTAB:
840 break;
841 }
842 }
843 if (ef->nprogtab == 0) {
844 link_elf_error(filename, "file has no contents");
845 error = ENOEXEC;
846 goto out;
847 }
848 if (nsym != 1) {
849 /* Only allow one symbol table for now */
850 link_elf_error(filename,
851 "file must have exactly one symbol table");
852 error = ENOEXEC;
853 goto out;
854 }
855 if (symstrindex < 0 || symstrindex > hdr->e_shnum ||
856 shdr[symstrindex].sh_type != SHT_STRTAB) {
857 link_elf_error(filename, "file has invalid symbol strings");
858 error = ENOEXEC;
859 goto out;
860 }
861
862 /* Allocate space for tracking the load chunks */
863 if (ef->nprogtab != 0)
864 ef->progtab = malloc(ef->nprogtab * sizeof(*ef->progtab),
865 M_LINKER, M_WAITOK | M_ZERO);
866 if (ef->nreltab != 0)
867 ef->reltab = malloc(ef->nreltab * sizeof(*ef->reltab),
868 M_LINKER, M_WAITOK | M_ZERO);
869 if (ef->nrelatab != 0)
870 ef->relatab = malloc(ef->nrelatab * sizeof(*ef->relatab),
871 M_LINKER, M_WAITOK | M_ZERO);
872
873 if (symtabindex == -1) {
874 link_elf_error(filename, "lost symbol table index");
875 error = ENOEXEC;
876 goto out;
877 }
878 /* Allocate space for and load the symbol table */
879 ef->ddbsymcnt = shdr[symtabindex].sh_size / sizeof(Elf_Sym);
880 ef->ddbsymtab = malloc(shdr[symtabindex].sh_size, M_LINKER, M_WAITOK);
881 error = vn_rdwr(UIO_READ, nd->ni_vp, (void *)ef->ddbsymtab,
882 shdr[symtabindex].sh_size, shdr[symtabindex].sh_offset,
883 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
884 &resid, td);
885 if (error)
886 goto out;
887 if (resid != 0){
888 error = EINVAL;
889 goto out;
890 }
891
892 /* Allocate space for and load the symbol strings */
893 ef->ddbstrcnt = shdr[symstrindex].sh_size;
894 ef->ddbstrtab = malloc(shdr[symstrindex].sh_size, M_LINKER, M_WAITOK);
895 error = vn_rdwr(UIO_READ, nd->ni_vp, ef->ddbstrtab,
896 shdr[symstrindex].sh_size, shdr[symstrindex].sh_offset,
897 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
898 &resid, td);
899 if (error)
900 goto out;
901 if (resid != 0){
902 error = EINVAL;
903 goto out;
904 }
905
906 /* Do we have a string table for the section names? */
907 shstrindex = -1;
908 if (hdr->e_shstrndx != 0 &&
909 shdr[hdr->e_shstrndx].sh_type == SHT_STRTAB) {
910 shstrindex = hdr->e_shstrndx;
911 ef->shstrcnt = shdr[shstrindex].sh_size;
912 ef->shstrtab = malloc(shdr[shstrindex].sh_size, M_LINKER,
913 M_WAITOK);
914 error = vn_rdwr(UIO_READ, nd->ni_vp, ef->shstrtab,
915 shdr[shstrindex].sh_size, shdr[shstrindex].sh_offset,
916 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
917 &resid, td);
918 if (error)
919 goto out;
920 if (resid != 0){
921 error = EINVAL;
922 goto out;
923 }
924 }
925
926 /* Size up code/data(progbits) and bss(nobits). */
927 alignmask = 0;
928 for (i = 0; i < hdr->e_shnum; i++) {
929 if (shdr[i].sh_size == 0)
930 continue;
931 switch (shdr[i].sh_type) {
932 case SHT_PROGBITS:
933 case SHT_NOBITS:
934#ifdef __amd64__
935 case SHT_X86_64_UNWIND:
936#endif
937 case SHT_INIT_ARRAY:
938 case SHT_FINI_ARRAY:
939 if ((shdr[i].sh_flags & SHF_ALLOC) == 0)
940 break;
941 alignmask = shdr[i].sh_addralign - 1;
942 mapsize += alignmask;
943 mapsize &= ~alignmask;
944 mapsize += shdr[i].sh_size;
945 break;
946 }
947 }
948
949 /*
950 * We know how much space we need for the text/data/bss/etc.
951 * This stuff needs to be in a single chunk so that profiling etc
952 * can get the bounds and gdb can associate offsets with modules
953 */
954 ef->object = vm_pager_allocate(OBJT_PHYS, NULL, round_page(mapsize),
955 VM_PROT_ALL, 0, thread0.td_ucred);
956 if (ef->object == NULL) {
957 error = ENOMEM;
958 goto out;
959 }
960#if VM_NRESERVLEVEL > 0
961 vm_object_color(ef->object, 0);
962#endif
963
964 /*
965 * In order to satisfy amd64's architectural requirements on the
966 * location of code and data in the kernel's address space, request a
967 * mapping that is above the kernel.
968 *
969 * Protections will be restricted once relocations are applied.
970 */
971#ifdef __amd64__
972 mapbase = KERNBASE;
973#else
974 mapbase = VM_MIN_KERNEL_ADDRESS;
975#endif
976 error = vm_map_find(kernel_map, ef->object, 0, &mapbase,
977 round_page(mapsize), 0, VMFS_OPTIMAL_SPACE, VM_PROT_ALL,
978 VM_PROT_ALL, 0);
979 if (error != KERN_SUCCESS) {
980 vm_object_deallocate(ef->object);
981 ef->object = NULL;
982 error = ENOMEM;
983 goto out;
984 }
985
986 /* Wire the pages */
987 error = vm_map_wire(kernel_map, mapbase,
988 mapbase + round_page(mapsize),
989 VM_MAP_WIRE_SYSTEM|VM_MAP_WIRE_NOHOLES);
990 if (error != KERN_SUCCESS) {
991 error = ENOMEM;
992 goto out;
993 }
994
995 /* Inform the kld system about the situation */
996 lf->address = ef->address = (caddr_t)mapbase;
997 lf->size = mapsize;
998
999 /*
1000 * Now load code/data(progbits), zero bss(nobits), allocate space for
1001 * and load relocs
1002 */
1003 pb = 0;
1004 rl = 0;
1005 ra = 0;
1006 alignmask = 0;
1007 for (i = 0; i < hdr->e_shnum; i++) {
1008 if (shdr[i].sh_size == 0)
1009 continue;
1010 switch (shdr[i].sh_type) {
1011 case SHT_PROGBITS:
1012 case SHT_NOBITS:
1013#ifdef __amd64__
1014 case SHT_X86_64_UNWIND:
1015#endif
1016 case SHT_INIT_ARRAY:
1017 case SHT_FINI_ARRAY:
1018 if ((shdr[i].sh_flags & SHF_ALLOC) == 0)
1019 break;
1020 alignmask = shdr[i].sh_addralign - 1;
1021 mapbase += alignmask;
1022 mapbase &= ~alignmask;
1023 if (ef->shstrtab != NULL && shdr[i].sh_name != 0) {
1024 ef->progtab[pb].name =
1025 ef->shstrtab + shdr[i].sh_name;
1026 if (!strcmp(ef->progtab[pb].name, ".ctors") ||
1027 shdr[i].sh_type == SHT_INIT_ARRAY) {
1028 if (lf->ctors_addr != 0) {
1029 printf(
1030 "%s: multiple ctor sections in %s\n",
1031 __func__, filename);
1032 } else {
1033 lf->ctors_addr =
1034 (caddr_t)mapbase;
1035 lf->ctors_size =
1036 shdr[i].sh_size;
1037 }
1038 } else if (!strcmp(ef->progtab[pb].name,
1039 ".dtors") ||
1040 shdr[i].sh_type == SHT_FINI_ARRAY) {
1041 if (lf->dtors_addr != 0) {
1042 printf(
1043 "%s: multiple dtor sections in %s\n",
1044 __func__, filename);
1045 } else {
1046 lf->dtors_addr =
1047 (caddr_t)mapbase;
1048 lf->dtors_size =
1049 shdr[i].sh_size;
1050 }
1051 }
1052 } else if (shdr[i].sh_type == SHT_PROGBITS)
1053 ef->progtab[pb].name = "<<PROGBITS>>";
1054#ifdef __amd64__
1055 else if (shdr[i].sh_type == SHT_X86_64_UNWIND)
1056 ef->progtab[pb].name = "<<UNWIND>>";
1057#endif
1058 else
1059 ef->progtab[pb].name = "<<NOBITS>>";
1060 if (ef->progtab[pb].name != NULL &&
1061 !strcmp(ef->progtab[pb].name, DPCPU_SETNAME)) {
1062 ef->progtab[pb].addr =
1063 dpcpu_alloc(shdr[i].sh_size);
1064 if (ef->progtab[pb].addr == NULL) {
1065 printf("%s: pcpu module space is out "
1066 "of space; cannot allocate %#jx "
1067 "for %s\n", __func__,
1068 (uintmax_t)shdr[i].sh_size,
1069 filename);
1070 }
1071 }
1072#ifdef VIMAGE
1073 else if (ef->progtab[pb].name != NULL &&
1074 !strcmp(ef->progtab[pb].name, VNET_SETNAME)) {
1075 ef->progtab[pb].addr =
1076 vnet_data_alloc(shdr[i].sh_size);
1077 if (ef->progtab[pb].addr == NULL) {
1078 printf("%s: vnet module space is out "
1079 "of space; cannot allocate %#jx "
1080 "for %s\n", __func__,
1081 (uintmax_t)shdr[i].sh_size,
1082 filename);
1083 }
1084 }
1085#endif
1086 else
1087 ef->progtab[pb].addr =
1088 (void *)(uintptr_t)mapbase;
1089 if (ef->progtab[pb].addr == NULL) {
1090 error = ENOSPC;
1091 goto out;
1092 }
1093 ef->progtab[pb].size = shdr[i].sh_size;
1094 ef->progtab[pb].flags = shdr[i].sh_flags;
1095 ef->progtab[pb].sec = i;
1096 if (shdr[i].sh_type == SHT_PROGBITS
1097#ifdef __amd64__
1098 || shdr[i].sh_type == SHT_X86_64_UNWIND
1099#endif
1100 ) {
1101 error = vn_rdwr(UIO_READ, nd->ni_vp,
1102 ef->progtab[pb].addr,
1103 shdr[i].sh_size, shdr[i].sh_offset,
1104 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred,
1105 NOCRED, &resid, td);
1106 if (error)
1107 goto out;
1108 if (resid != 0){
1109 error = EINVAL;
1110 goto out;
1111 }
1112 /* Initialize the per-cpu or vnet area. */
1113 if (ef->progtab[pb].addr != (void *)mapbase &&
1114 !strcmp(ef->progtab[pb].name, DPCPU_SETNAME))
1115 dpcpu_copy(ef->progtab[pb].addr,
1116 shdr[i].sh_size);
1117#ifdef VIMAGE
1118 else if (ef->progtab[pb].addr !=
1119 (void *)mapbase &&
1120 !strcmp(ef->progtab[pb].name, VNET_SETNAME))
1121 vnet_data_copy(ef->progtab[pb].addr,
1122 shdr[i].sh_size);
1123#endif
1124 } else
1125 bzero(ef->progtab[pb].addr, shdr[i].sh_size);
1126
1127 /* Update all symbol values with the offset. */
1128 for (j = 0; j < ef->ddbsymcnt; j++) {
1129 es = &ef->ddbsymtab[j];
1130 if (es->st_shndx != i)
1131 continue;
1132 es->st_value += (Elf_Addr)ef->progtab[pb].addr;
1133 }
1134 mapbase += shdr[i].sh_size;
1135 pb++;
1136 break;
1137 case SHT_REL:
1138 if ((shdr[shdr[i].sh_info].sh_flags & SHF_ALLOC) == 0)
1139 break;
1140 ef->reltab[rl].rel = malloc(shdr[i].sh_size, M_LINKER,
1141 M_WAITOK);
1142 ef->reltab[rl].nrel = shdr[i].sh_size / sizeof(Elf_Rel);
1143 ef->reltab[rl].sec = shdr[i].sh_info;
1144 error = vn_rdwr(UIO_READ, nd->ni_vp,
1145 (void *)ef->reltab[rl].rel,
1146 shdr[i].sh_size, shdr[i].sh_offset,
1147 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
1148 &resid, td);
1149 if (error)
1150 goto out;
1151 if (resid != 0){
1152 error = EINVAL;
1153 goto out;
1154 }
1155 rl++;
1156 break;
1157 case SHT_RELA:
1158 if ((shdr[shdr[i].sh_info].sh_flags & SHF_ALLOC) == 0)
1159 break;
1160 ef->relatab[ra].rela = malloc(shdr[i].sh_size, M_LINKER,
1161 M_WAITOK);
1162 ef->relatab[ra].nrela =
1163 shdr[i].sh_size / sizeof(Elf_Rela);
1164 ef->relatab[ra].sec = shdr[i].sh_info;
1165 error = vn_rdwr(UIO_READ, nd->ni_vp,
1166 (void *)ef->relatab[ra].rela,
1167 shdr[i].sh_size, shdr[i].sh_offset,
1168 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
1169 &resid, td);
1170 if (error)
1171 goto out;
1172 if (resid != 0){
1173 error = EINVAL;
1174 goto out;
1175 }
1176 ra++;
1177 break;
1178 }
1179 }
1180 if (pb != ef->nprogtab) {
1181 link_elf_error(filename, "lost progbits");
1182 error = ENOEXEC;
1183 goto out;
1184 }
1185 if (rl != ef->nreltab) {
1186 link_elf_error(filename, "lost reltab");
1187 error = ENOEXEC;
1188 goto out;
1189 }
1190 if (ra != ef->nrelatab) {
1191 link_elf_error(filename, "lost relatab");
1192 error = ENOEXEC;
1193 goto out;
1194 }
1195 if (mapbase != (vm_offset_t)ef->address + mapsize) {
1196 printf(
1197 "%s: mapbase 0x%lx != address %p + mapsize 0x%lx (0x%lx)\n",
1198 filename != NULL ? filename : "<none>",
1199 (u_long)mapbase, ef->address, (u_long)mapsize,
1200 (u_long)(vm_offset_t)ef->address + mapsize);
1201 error = ENOMEM;
1202 goto out;
1203 }
1204
1205 /* Local intra-module relocations */
1206 error = link_elf_reloc_local(lf, false);
1207 if (error != 0)
1208 goto out;
1209
1210 /* Pull in dependencies */
1211 VOP_UNLOCK(nd->ni_vp);
1212 error = linker_load_dependencies(lf);
1213 vn_lock(nd->ni_vp, LK_EXCLUSIVE | LK_RETRY);
1214 if (error)
1215 goto out;
1216
1217 /* External relocations */
1218 error = relocate_file(ef);
1219 if (error)
1220 goto out;
1221
1222 /* Notify MD code that a module is being loaded. */
1223 error = elf_cpu_load_file(lf);
1224 if (error)
1225 goto out;
1226
1227#if defined(__i386__) || defined(__amd64__)
1228 /* Now ifuncs. */
1229 error = link_elf_reloc_local(lf, true);
1230 if (error != 0)
1231 goto out;
1232#endif
1233
1234 link_elf_protect(ef);
1235 link_elf_invoke_cbs(lf->ctors_addr, lf->ctors_size);
1236 *result = lf;
1237
1238out:
1239 VOP_UNLOCK(nd->ni_vp);
1240 vn_close(nd->ni_vp, FREAD, td->td_ucred, td);
1241 free(nd, M_TEMP);
1242 if (error && lf)
1243 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
1244 free(hdr, M_LINKER);
1245
1246 return error;
1247}
1248
1249static void
1250link_elf_unload_file(linker_file_t file)
1251{
1252 elf_file_t ef = (elf_file_t) file;
1253 u_int i;
1254
1255 link_elf_invoke_cbs(file->dtors_addr, file->dtors_size);
1256
1257 /* Notify MD code that a module is being unloaded. */
1258 elf_cpu_unload_file(file);
1259
1260 if (ef->progtab) {
1261 for (i = 0; i < ef->nprogtab; i++) {
1262 if (ef->progtab[i].size == 0)
1263 continue;
1264 if (ef->progtab[i].name == NULL)
1265 continue;
1266 if (!strcmp(ef->progtab[i].name, DPCPU_SETNAME))
1267 dpcpu_free(ef->progtab[i].addr,
1268 ef->progtab[i].size);
1269#ifdef VIMAGE
1270 else if (!strcmp(ef->progtab[i].name, VNET_SETNAME))
1271 vnet_data_free(ef->progtab[i].addr,
1272 ef->progtab[i].size);
1273#endif
1274 }
1275 }
1276 if (ef->preloaded) {
1277 free(ef->reltab, M_LINKER);
1278 free(ef->relatab, M_LINKER);
1279 free(ef->progtab, M_LINKER);
1280 free(ef->ctftab, M_LINKER);
1281 free(ef->ctfoff, M_LINKER);
1282 free(ef->typoff, M_LINKER);
1283 if (file->pathname != NULL)
1284 preload_delete_name(file->pathname);
1285 return;
1286 }
1287
1288 for (i = 0; i < ef->nreltab; i++)
1289 free(ef->reltab[i].rel, M_LINKER);
1290 for (i = 0; i < ef->nrelatab; i++)
1291 free(ef->relatab[i].rela, M_LINKER);
1292 free(ef->reltab, M_LINKER);
1293 free(ef->relatab, M_LINKER);
1294 free(ef->progtab, M_LINKER);
1295
1296 if (ef->object != NULL)
1297 vm_map_remove(kernel_map, (vm_offset_t)ef->address,
1298 (vm_offset_t)ef->address + ptoa(ef->object->size));
1299 free(ef->e_shdr, M_LINKER);
1300 free(ef->ddbsymtab, M_LINKER);
1301 free(ef->ddbstrtab, M_LINKER);
1302 free(ef->shstrtab, M_LINKER);
1303 free(ef->ctftab, M_LINKER);
1304 free(ef->ctfoff, M_LINKER);
1305 free(ef->typoff, M_LINKER);
1306}
1307
1308static const char *
1309symbol_name(elf_file_t ef, Elf_Size r_info)
1310{
1311 const Elf_Sym *ref;
1312
1313 if (ELF_R_SYM(r_info)) {
1314 ref = ef->ddbsymtab + ELF_R_SYM(r_info);
1315 return ef->ddbstrtab + ref->st_name;
1316 } else
1317 return NULL;
1318}
1319
1320static Elf_Addr
1321findbase(elf_file_t ef, int sec)
1322{
1323 int i;
1324 Elf_Addr base = 0;
1325
1326 for (i = 0; i < ef->nprogtab; i++) {
1327 if (sec == ef->progtab[i].sec) {
1328 base = (Elf_Addr)ef->progtab[i].addr;
1329 break;
1330 }
1331 }
1332 return base;
1333}
1334
1335static int
1336relocate_file1(elf_file_t ef, bool ifuncs)
1337{
1338 const Elf_Rel *rellim;
1339 const Elf_Rel *rel;
1340 const Elf_Rela *relalim;
1341 const Elf_Rela *rela;
1342 const char *symname;
1343 const Elf_Sym *sym;
1344 int i;
1345 Elf_Size symidx;
1346 Elf_Addr base;
1347
1348 /* Perform relocations without addend if there are any: */
1349 for (i = 0; i < ef->nreltab; i++) {
1350 rel = ef->reltab[i].rel;
1351 if (rel == NULL) {
1352 link_elf_error(ef->lf.filename, "lost a reltab!");
1353 return (ENOEXEC);
1354 }
1355 rellim = rel + ef->reltab[i].nrel;
1356 base = findbase(ef, ef->reltab[i].sec);
1357 if (base == 0) {
1358 link_elf_error(ef->lf.filename, "lost base for reltab");
1359 return (ENOEXEC);
1360 }
1361 for ( ; rel < rellim; rel++) {
1362 symidx = ELF_R_SYM(rel->r_info);
1363 if (symidx >= ef->ddbsymcnt)
1364 continue;
1365 sym = ef->ddbsymtab + symidx;
1366 /* Local relocs are already done */
1367 if (ELF_ST_BIND(sym->st_info) == STB_LOCAL)
1368 continue;
1369 if ((ELF_ST_TYPE(sym->st_info) == STT_GNU_IFUNC ||
1370 elf_is_ifunc_reloc(rel->r_info)) != ifuncs)
1371 continue;
1372 if (elf_reloc(&ef->lf, base, rel, ELF_RELOC_REL,
1373 elf_obj_lookup)) {
1374 symname = symbol_name(ef, rel->r_info);
1375 printf("link_elf_obj: symbol %s undefined\n",
1376 symname);
1377 return (ENOENT);
1378 }
1379 }
1380 }
1381
1382 /* Perform relocations with addend if there are any: */
1383 for (i = 0; i < ef->nrelatab; i++) {
1384 rela = ef->relatab[i].rela;
1385 if (rela == NULL) {
1386 link_elf_error(ef->lf.filename, "lost a relatab!");
1387 return (ENOEXEC);
1388 }
1389 relalim = rela + ef->relatab[i].nrela;
1390 base = findbase(ef, ef->relatab[i].sec);
1391 if (base == 0) {
1392 link_elf_error(ef->lf.filename,
1393 "lost base for relatab");
1394 return (ENOEXEC);
1395 }
1396 for ( ; rela < relalim; rela++) {
1397 symidx = ELF_R_SYM(rela->r_info);
1398 if (symidx >= ef->ddbsymcnt)
1399 continue;
1400 sym = ef->ddbsymtab + symidx;
1401 /* Local relocs are already done */
1402 if (ELF_ST_BIND(sym->st_info) == STB_LOCAL)
1403 continue;
1404 if ((ELF_ST_TYPE(sym->st_info) == STT_GNU_IFUNC ||
1405 elf_is_ifunc_reloc(rela->r_info)) != ifuncs)
1406 continue;
1407 if (elf_reloc(&ef->lf, base, rela, ELF_RELOC_RELA,
1408 elf_obj_lookup)) {
1409 symname = symbol_name(ef, rela->r_info);
1410 printf("link_elf_obj: symbol %s undefined\n",
1411 symname);
1412 return (ENOENT);
1413 }
1414 }
1415 }
1416
1417 /*
1418 * Only clean SHN_FBSD_CACHED for successful return. If we
1419 * modified symbol table for the object but found an
1420 * unresolved symbol, there is no reason to roll back.
1421 */
1422 elf_obj_cleanup_globals_cache(ef);
1423
1424 return (0);
1425}
1426
1427static int
1428relocate_file(elf_file_t ef)
1429{
1430 int error;
1431
1432 error = relocate_file1(ef, false);
1433 if (error == 0)
1434 error = relocate_file1(ef, true);
1435 return (error);
1436}
1437
1438static int
1439link_elf_lookup_symbol1(linker_file_t lf, const char *name, c_linker_sym_t *sym,
1440 bool see_local)
1441{
1442 elf_file_t ef = (elf_file_t)lf;
1443 const Elf_Sym *symp;
1444 const char *strp;
1445 int i;
1446
1447 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) {
1448 strp = ef->ddbstrtab + symp->st_name;
1449 if (symp->st_shndx != SHN_UNDEF && strcmp(name, strp) == 0) {
1450 if (see_local ||
1451 ELF_ST_BIND(symp->st_info) == STB_GLOBAL) {
1452 *sym = (c_linker_sym_t) symp;
1453 return (0);
1454 }
1455 return (ENOENT);
1456 }
1457 }
1458 return (ENOENT);
1459}
1460
1461static int
1462link_elf_lookup_symbol(linker_file_t lf, const char *name, c_linker_sym_t *sym)
1463{
1464 return (link_elf_lookup_symbol1(lf, name, sym,
1465 link_elf_obj_leak_locals));
1466}
1467
1468static int
1469link_elf_lookup_debug_symbol(linker_file_t lf, const char *name,
1470 c_linker_sym_t *sym)
1471{
1472 return (link_elf_lookup_symbol1(lf, name, sym, true));
1473}
1474
1475static int
1476link_elf_symbol_values1(linker_file_t lf, c_linker_sym_t sym,
1477 linker_symval_t *symval, bool see_local)
1478{
1479 elf_file_t ef;
1480 const Elf_Sym *es;
1481 caddr_t val;
1482
1483 ef = (elf_file_t) lf;
1484 es = (const Elf_Sym*) sym;
1485 val = (caddr_t)es->st_value;
1486 if (es >= ef->ddbsymtab && es < (ef->ddbsymtab + ef->ddbsymcnt)) {
1487 if (!see_local && ELF_ST_BIND(es->st_info) == STB_LOCAL)
1488 return (ENOENT);
1489 symval->name = ef->ddbstrtab + es->st_name;
1490 val = (caddr_t)es->st_value;
1491 if (ELF_ST_TYPE(es->st_info) == STT_GNU_IFUNC)
1492 val = ((caddr_t (*)(void))val)();
1493 symval->value = val;
1494 symval->size = es->st_size;
1495 return (0);
1496 }
1497 return (ENOENT);
1498}
1499
1500static int
1501link_elf_symbol_values(linker_file_t lf, c_linker_sym_t sym,
1502 linker_symval_t *symval)
1503{
1504 return (link_elf_symbol_values1(lf, sym, symval,
1505 link_elf_obj_leak_locals));
1506}
1507
1508static int
1509link_elf_debug_symbol_values(linker_file_t lf, c_linker_sym_t sym,
1510 linker_symval_t *symval)
1511{
1512 return (link_elf_symbol_values1(lf, sym, symval, true));
1513}
1514
1515static int
1516link_elf_search_symbol(linker_file_t lf, caddr_t value,
1517 c_linker_sym_t *sym, long *diffp)
1518{
1519 elf_file_t ef = (elf_file_t)lf;
1520 u_long off = (uintptr_t)(void *)value;
1521 u_long diff = off;
1522 u_long st_value;
1523 const Elf_Sym *es;
1524 const Elf_Sym *best = NULL;
1525 int i;
1526
1527 for (i = 0, es = ef->ddbsymtab; i < ef->ddbsymcnt; i++, es++) {
1528 if (es->st_name == 0)
1529 continue;
1530 st_value = es->st_value;
1531 if (off >= st_value) {
1532 if (off - st_value < diff) {
1533 diff = off - st_value;
1534 best = es;
1535 if (diff == 0)
1536 break;
1537 } else if (off - st_value == diff) {
1538 best = es;
1539 }
1540 }
1541 }
1542 if (best == NULL)
1543 *diffp = off;
1544 else
1545 *diffp = diff;
1546 *sym = (c_linker_sym_t) best;
1547
1548 return (0);
1549}
1550
1551/*
1552 * Look up a linker set on an ELF system.
1553 */
1554static int
1555link_elf_lookup_set(linker_file_t lf, const char *name,
1556 void ***startp, void ***stopp, int *countp)
1557{
1558 elf_file_t ef = (elf_file_t)lf;
1559 void **start, **stop;
1560 int i, count;
1561
1562 /* Relative to section number */
1563 for (i = 0; i < ef->nprogtab; i++) {
1564 if ((strncmp(ef->progtab[i].name, "set_", 4) == 0) &&
1565 strcmp(ef->progtab[i].name + 4, name) == 0) {
1566 start = (void **)ef->progtab[i].addr;
1567 stop = (void **)((char *)ef->progtab[i].addr +
1568 ef->progtab[i].size);
1569 count = stop - start;
1570 if (startp)
1571 *startp = start;
1572 if (stopp)
1573 *stopp = stop;
1574 if (countp)
1575 *countp = count;
1576 return (0);
1577 }
1578 }
1579 return (ESRCH);
1580}
1581
1582static int
1583link_elf_each_function_name(linker_file_t file,
1584 int (*callback)(const char *, void *), void *opaque)
1585{
1586 elf_file_t ef = (elf_file_t)file;
1587 const Elf_Sym *symp;
1588 int i, error;
1589
1590 /* Exhaustive search */
1591 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) {
1592 if (symp->st_value != 0 &&
1593 (ELF_ST_TYPE(symp->st_info) == STT_FUNC ||
1594 ELF_ST_TYPE(symp->st_info) == STT_GNU_IFUNC)) {
1595 error = callback(ef->ddbstrtab + symp->st_name, opaque);
1596 if (error)
1597 return (error);
1598 }
1599 }
1600 return (0);
1601}
1602
1603static int
1604link_elf_each_function_nameval(linker_file_t file,
1605 linker_function_nameval_callback_t callback, void *opaque)
1606{
1607 linker_symval_t symval;
1608 elf_file_t ef = (elf_file_t)file;
1609 const Elf_Sym *symp;
1610 int i, error;
1611
1612 /* Exhaustive search */
1613 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) {
1614 if (symp->st_value != 0 &&
1615 (ELF_ST_TYPE(symp->st_info) == STT_FUNC ||
1616 ELF_ST_TYPE(symp->st_info) == STT_GNU_IFUNC)) {
1617 error = link_elf_debug_symbol_values(file,
1618 (c_linker_sym_t)symp, &symval);
1619 if (error == 0)
1620 error = callback(file, i, &symval, opaque);
1621 if (error != 0)
1622 return (error);
1623 }
1624 }
1625 return (0);
1626}
1627
1628static void
1629elf_obj_cleanup_globals_cache(elf_file_t ef)
1630{
1631 Elf_Sym *sym;
1632 Elf_Size i;
1633
1634 for (i = 0; i < ef->ddbsymcnt; i++) {
1635 sym = ef->ddbsymtab + i;
1636 if (sym->st_shndx == SHN_FBSD_CACHED) {
1637 sym->st_shndx = SHN_UNDEF;
1638 sym->st_value = 0;
1639 }
1640 }
1641}
1642
1643/*
1644 * Symbol lookup function that can be used when the symbol index is known (ie
1645 * in relocations). It uses the symbol index instead of doing a fully fledged
1646 * hash table based lookup when such is valid. For example for local symbols.
1647 * This is not only more efficient, it's also more correct. It's not always
1648 * the case that the symbol can be found through the hash table.
1649 */
1650static int
1651elf_obj_lookup(linker_file_t lf, Elf_Size symidx, int deps, Elf_Addr *res)
1652{
1653 elf_file_t ef = (elf_file_t)lf;
1654 Elf_Sym *sym;
1655 const char *symbol;
1656 Elf_Addr res1;
1657
1658 /* Don't even try to lookup the symbol if the index is bogus. */
1659 if (symidx >= ef->ddbsymcnt) {
1660 *res = 0;
1661 return (EINVAL);
1662 }
1663
1664 sym = ef->ddbsymtab + symidx;
1665
1666 /* Quick answer if there is a definition included. */
1667 if (sym->st_shndx != SHN_UNDEF) {
1668 res1 = (Elf_Addr)sym->st_value;
1669 if (ELF_ST_TYPE(sym->st_info) == STT_GNU_IFUNC)
1670 res1 = ((Elf_Addr (*)(void))res1)();
1671 *res = res1;
1672 return (0);
1673 }
1674
1675 /* If we get here, then it is undefined and needs a lookup. */
1676 switch (ELF_ST_BIND(sym->st_info)) {
1677 case STB_LOCAL:
1678 /* Local, but undefined? huh? */
1679 *res = 0;
1680 return (EINVAL);
1681
1682 case STB_GLOBAL:
1683 case STB_WEAK:
1684 /* Relative to Data or Function name */
1685 symbol = ef->ddbstrtab + sym->st_name;
1686
1687 /* Force a lookup failure if the symbol name is bogus. */
1688 if (*symbol == 0) {
1689 *res = 0;
1690 return (EINVAL);
1691 }
1692 res1 = (Elf_Addr)linker_file_lookup_symbol(lf, symbol, deps);
1693
1694 /*
1695 * Cache global lookups during module relocation. The failure
1696 * case is particularly expensive for callers, who must scan
1697 * through the entire globals table doing strcmp(). Cache to
1698 * avoid doing such work repeatedly.
1699 *
1700 * After relocation is complete, undefined globals will be
1701 * restored to SHN_UNDEF in elf_obj_cleanup_globals_cache(),
1702 * above.
1703 */
1704 if (res1 != 0) {
1705 sym->st_shndx = SHN_FBSD_CACHED;
1706 sym->st_value = res1;
1707 *res = res1;
1708 return (0);
1709 } else if (ELF_ST_BIND(sym->st_info) == STB_WEAK) {
1710 sym->st_value = 0;
1711 *res = 0;
1712 return (0);
1713 }
1714 return (EINVAL);
1715
1716 default:
1717 return (EINVAL);
1718 }
1719}
1720
1721static void
1722link_elf_fix_link_set(elf_file_t ef)
1723{
1724 static const char startn[] = "__start_";
1725 static const char stopn[] = "__stop_";
1726 Elf_Sym *sym;
1727 const char *sym_name, *linkset_name;
1728 Elf_Addr startp, stopp;
1729 Elf_Size symidx;
1730 int start, i;
1731
1732 startp = stopp = 0;
1733 for (symidx = 1 /* zero entry is special */;
1734 symidx < ef->ddbsymcnt; symidx++) {
1735 sym = ef->ddbsymtab + symidx;
1736 if (sym->st_shndx != SHN_UNDEF)
1737 continue;
1738
1739 sym_name = ef->ddbstrtab + sym->st_name;
1740 if (strncmp(sym_name, startn, sizeof(startn) - 1) == 0) {
1741 start = 1;
1742 linkset_name = sym_name + sizeof(startn) - 1;
1743 }
1744 else if (strncmp(sym_name, stopn, sizeof(stopn) - 1) == 0) {
1745 start = 0;
1746 linkset_name = sym_name + sizeof(stopn) - 1;
1747 }
1748 else
1749 continue;
1750
1751 for (i = 0; i < ef->nprogtab; i++) {
1752 if (strcmp(ef->progtab[i].name, linkset_name) == 0) {
1753 startp = (Elf_Addr)ef->progtab[i].addr;
1754 stopp = (Elf_Addr)(startp + ef->progtab[i].size);
1755 break;
1756 }
1757 }
1758 if (i == ef->nprogtab)
1759 continue;
1760
1761 sym->st_value = start ? startp : stopp;
1762 sym->st_shndx = i;
1763 }
1764}
1765
1766static int
1767link_elf_reloc_local(linker_file_t lf, bool ifuncs)
1768{
1769 elf_file_t ef = (elf_file_t)lf;
1770 const Elf_Rel *rellim;
1771 const Elf_Rel *rel;
1772 const Elf_Rela *relalim;
1773 const Elf_Rela *rela;
1774 const Elf_Sym *sym;
1775 Elf_Addr base;
1776 int i;
1777 Elf_Size symidx;
1778
1779 link_elf_fix_link_set(ef);
1780
1781 /* Perform relocations without addend if there are any: */
1782 for (i = 0; i < ef->nreltab; i++) {
1783 rel = ef->reltab[i].rel;
1784 if (rel == NULL) {
1785 link_elf_error(ef->lf.filename, "lost a reltab");
1786 return (ENOEXEC);
1787 }
1788 rellim = rel + ef->reltab[i].nrel;
1789 base = findbase(ef, ef->reltab[i].sec);
1790 if (base == 0) {
1791 link_elf_error(ef->lf.filename, "lost base for reltab");
1792 return (ENOEXEC);
1793 }
1794 for ( ; rel < rellim; rel++) {
1795 symidx = ELF_R_SYM(rel->r_info);
1796 if (symidx >= ef->ddbsymcnt)
1797 continue;
1798 sym = ef->ddbsymtab + symidx;
1799 /* Only do local relocs */
1800 if (ELF_ST_BIND(sym->st_info) != STB_LOCAL)
1801 continue;
1802 if ((ELF_ST_TYPE(sym->st_info) == STT_GNU_IFUNC ||
1803 elf_is_ifunc_reloc(rel->r_info)) != ifuncs)
1804 continue;
1805 if (elf_reloc_local(lf, base, rel, ELF_RELOC_REL,
1806 elf_obj_lookup) != 0)
1807 return (ENOEXEC);
1808 }
1809 }
1810
1811 /* Perform relocations with addend if there are any: */
1812 for (i = 0; i < ef->nrelatab; i++) {
1813 rela = ef->relatab[i].rela;
1814 if (rela == NULL) {
1815 link_elf_error(ef->lf.filename, "lost a relatab!");
1816 return (ENOEXEC);
1817 }
1818 relalim = rela + ef->relatab[i].nrela;
1819 base = findbase(ef, ef->relatab[i].sec);
1820 if (base == 0) {
1821 link_elf_error(ef->lf.filename, "lost base for reltab");
1822 return (ENOEXEC);
1823 }
1824 for ( ; rela < relalim; rela++) {
1825 symidx = ELF_R_SYM(rela->r_info);
1826 if (symidx >= ef->ddbsymcnt)
1827 continue;
1828 sym = ef->ddbsymtab + symidx;
1829 /* Only do local relocs */
1830 if (ELF_ST_BIND(sym->st_info) != STB_LOCAL)
1831 continue;
1832 if ((ELF_ST_TYPE(sym->st_info) == STT_GNU_IFUNC ||
1833 elf_is_ifunc_reloc(rela->r_info)) != ifuncs)
1834 continue;
1835 if (elf_reloc_local(lf, base, rela, ELF_RELOC_RELA,
1836 elf_obj_lookup) != 0)
1837 return (ENOEXEC);
1838 }
1839 }
1840 return (0);
1841}
1842
1843static long
1844link_elf_symtab_get(linker_file_t lf, const Elf_Sym **symtab)
1845{
1846 elf_file_t ef = (elf_file_t)lf;
1847
1848 *symtab = ef->ddbsymtab;
1849 if (*symtab == NULL)
1850 return (0);
1851 return (ef->ddbsymcnt);
1852}
1853
1854static long
1855link_elf_strtab_get(linker_file_t lf, caddr_t *strtab)
1856{
1857 elf_file_t ef = (elf_file_t)lf;
1858
1859 *strtab = ef->ddbstrtab;
1860 if (*strtab == NULL)
1861 return (0);
1862 return (ef->ddbstrcnt);
1863}
count
int * count
Definition: cpufreq_if.m:63
type
device_property_type_t type
Definition: bus_if.m:941
name
const char * name
Definition: kern_fail.c:145
__ELF_WORD_SIZE
#define __ELF_WORD_SIZE
Definition: imgact_elf32.c:32
kern_ctf.c
link_elf_ctf_get
static int link_elf_ctf_get(linker_file_t lf, linker_ctf_t *lc)
Definition: kern_ctf.c:42
linker_ctf_get
int linker_ctf_get(linker_file_t file, linker_ctf_t *lc)
Definition: kern_linker.c:777
linker_debug_symbol_values
static int linker_debug_symbol_values(c_linker_sym_t sym, linker_symval_t *symval)
Definition: kern_linker.c:969
linker_file_unload
int linker_file_unload(linker_file_t file, int flags)
Definition: kern_linker.c:654
linker_file_lookup_symbol
caddr_t linker_file_lookup_symbol(linker_file_t file, const char *name, int deps)
Definition: kern_linker.c:824
linker_load_file
static int linker_load_file(const char *filename, linker_file_t *result)
Definition: kern_linker.c:432
linker_load_dependencies
int linker_load_dependencies(linker_file_t lf)
Definition: kern_linker.c:2232
linker_make_file
linker_file_t linker_make_file(const char *pathname, linker_class_t lc)
Definition: kern_linker.c:617
linker_add_class
int linker_add_class(linker_class_t lc)
Definition: kern_linker.c:180
malloc
void *() malloc(size_t size, struct malloc_type *mtp, int flags)
Definition: kern_malloc.c:632
free
void free(void *addr, struct malloc_type *mtp)
Definition: kern_malloc.c:907
link_elf_invoke_cbs
static void link_elf_invoke_cbs(caddr_t addr, size_t size)
Definition: link_elf_obj.c:638
link_elf_lookup_debug_symbol
static int link_elf_lookup_debug_symbol(linker_file_t, const char *, c_linker_sym_t *)
Definition: link_elf_obj.c:1469
link_elf_symbol_values1
static int link_elf_symbol_values1(linker_file_t lf, c_linker_sym_t sym, linker_symval_t *symval, bool see_local)
Definition: link_elf_obj.c:1476
link_elf_init
static void link_elf_init(void *arg)
Definition: link_elf_obj.c:205
link_elf_link_preload_finish
static int link_elf_link_preload_finish(linker_file_t)
Definition: link_elf_obj.c:654
link_elf_methods
static kobj_method_t link_elf_methods[]
Definition: link_elf_obj.c:159
link_elf_search_symbol
static int link_elf_search_symbol(linker_file_t, caddr_t value, c_linker_sym_t *sym, long *diffp)
Definition: link_elf_obj.c:1516
link_elf_symtab_get
static long link_elf_symtab_get(linker_file_t, const Elf_Sym **)
Definition: link_elf_obj.c:1844
link_elf_debug_symbol_values
static int link_elf_debug_symbol_values(linker_file_t, c_linker_sym_t, linker_symval_t *)
Definition: link_elf_obj.c:1509
link_elf_symbol_values
static int link_elf_symbol_values(linker_file_t, c_linker_sym_t, linker_symval_t *)
Definition: link_elf_obj.c:1501
link_elf_each_function_nameval
static int link_elf_each_function_nameval(linker_file_t, linker_function_nameval_callback_t, void *)
Definition: link_elf_obj.c:1604
elf_obj_cleanup_globals_cache
static void elf_obj_cleanup_globals_cache(elf_file_t)
Definition: link_elf_obj.c:1629
link_elf_each_function_name
static int link_elf_each_function_name(linker_file_t, int(*)(const char *, void *), void *)
Definition: link_elf_obj.c:1583
link_elf_lookup_symbol
static int link_elf_lookup_symbol(linker_file_t, const char *, c_linker_sym_t *)
Definition: link_elf_obj.c:1462
link_elf_strtab_get
static long link_elf_strtab_get(linker_file_t, caddr_t *)
Definition: link_elf_obj.c:1855
SYSINIT
SYSINIT(link_elf_obj, SI_SUB_KLD, SI_ORDER_SECOND, link_elf_init, NULL)
link_elf_unload_file
static void link_elf_unload_file(linker_file_t)
Definition: link_elf_obj.c:1250
SYSCTL_BOOL
SYSCTL_BOOL(_debug, OID_AUTO, link_elf_obj_leak_locals, CTLFLAG_RWTUN, &link_elf_obj_leak_locals, 0, "Allow local symbols to participate in global module symbol resolution")
link_elf_class
static struct linker_class link_elf_class
Definition: link_elf_obj.c:178
relocate_file1
static int relocate_file1(elf_file_t ef, bool ifuncs)
Definition: link_elf_obj.c:1336
relocate_file
static int relocate_file(elf_file_t ef)
Definition: link_elf_obj.c:1428
__FBSDID
__FBSDID("$FreeBSD$")
link_elf_obj_leak_locals
static bool link_elf_obj_leak_locals
Definition: link_elf_obj.c:187
findbase
static Elf_Addr findbase(elf_file_t ef, int sec)
Definition: link_elf_obj.c:1321
link_elf_protect
static void link_elf_protect(elf_file_t ef)
Definition: link_elf_obj.c:245
link_elf_fix_link_set
static void link_elf_fix_link_set(elf_file_t ef)
Definition: link_elf_obj.c:1722
symbol_name
static const char * symbol_name(elf_file_t ef, Elf_Size r_info)
Definition: link_elf_obj.c:1309
link_elf_lookup_symbol1
static int link_elf_lookup_symbol1(linker_file_t lf, const char *name, c_linker_sym_t *sym, bool see_local)
Definition: link_elf_obj.c:1439
link_elf_reloc_local
static int link_elf_reloc_local(linker_file_t, bool)
Definition: link_elf_obj.c:1767
elf_file_t
struct elf_file * elf_file_t
link_elf_link_preload
static int link_elf_link_preload(linker_class_t cls, const char *, linker_file_t *)
Definition: link_elf_obj.c:336
link_elf_protect_range
static void link_elf_protect_range(elf_file_t ef, vm_offset_t start, vm_offset_t end, vm_prot_t prot)
Definition: link_elf_obj.c:213
link_elf_load_file
static int link_elf_load_file(linker_class_t, const char *, linker_file_t *)
Definition: link_elf_obj.c:684
link_elf_lookup_set
static int link_elf_lookup_set(linker_file_t, const char *, void ***, void ***, int *)
Definition: link_elf_obj.c:1555
elf_obj_lookup
static int elf_obj_lookup(linker_file_t lf, Elf_Size symidx, int deps, Elf_Addr *)
Definition: link_elf_obj.c:1651
link_elf_error
static void link_elf_error(const char *filename, const char *s)
Definition: link_elf_obj.c:196
strtab
caddr_t * strtab
Definition: linker_if.m:134
filename
const char * filename
Definition: linker_if.m:147
diffp
long * diffp
Definition: linker_if.m:65
stop
void *** stop
Definition: linker_if.m:99
result
linker_file_t * result
Definition: linker_if.m:148
sym
c_linker_sym_t sym
Definition: linker_if.m:51
symp
c_linker_sym_t * symp
Definition: linker_if.m:40
symtab
const Elf_Sym ** symtab
Definition: linker_if.m:125
start
void *** start
Definition: linker_if.m:98
opaque
void * opaque
Definition: linker_if.m:75
value
caddr_t value
Definition: linker_if.m:63
callback
linker_function_name_callback_t callback
Definition: linker_if.m:74
addr
uint64_t * addr
Definition: msi_if.m:89
res
struct resource * res
Definition: pic_if.m:98
Elf_progent
Definition: link_elf_obj.c:74
Elf_progent::addr
void * addr
Definition: link_elf_obj.c:75
Elf_progent::size
Elf_Off size
Definition: link_elf_obj.c:76
Elf_progent::sec
int sec
Definition: link_elf_obj.c:78
Elf_progent::name
char * name
Definition: link_elf_obj.c:79
Elf_progent::flags
int flags
Definition: link_elf_obj.c:77
Elf_relaent
Definition: link_elf_obj.c:88
Elf_relaent::rela
Elf_Rela * rela
Definition: link_elf_obj.c:89
Elf_relaent::sec
int sec
Definition: link_elf_obj.c:91
Elf_relaent::nrela
int nrela
Definition: link_elf_obj.c:90
Elf_relent
Definition: link_elf_obj.c:82
Elf_relent::nrel
int nrel
Definition: link_elf_obj.c:84
Elf_relent::sec
int sec
Definition: link_elf_obj.c:85
Elf_relent::rel
Elf_Rel * rel
Definition: link_elf_obj.c:83
elf_file
Definition: link_elf.c:78
elf_file::ctfcnt
long ctfcnt
Definition: link_elf.c:111
elf_file::progtab
Elf_progent * progtab
Definition: link_elf_obj.c:102
elf_file::shstrcnt
long shstrcnt
Definition: link_elf_obj.c:117
elf_file::typoff
caddr_t typoff
Definition: link_elf.c:113
elf_file::ddbstrtab
caddr_t ddbstrtab
Definition: link_elf.c:106
elf_file::nprogtab
u_int nprogtab
Definition: link_elf_obj.c:103
elf_file::address
caddr_t address
Definition: link_elf.c:81
elf_file::nrelatab
u_int nrelatab
Definition: link_elf_obj.c:106
elf_file::shstrtab
caddr_t shstrtab
Definition: link_elf_obj.c:116
elf_file::e_shdr
Elf_Shdr * e_shdr
Definition: link_elf_obj.c:100
elf_file::nreltab
int nreltab
Definition: link_elf_obj.c:109
elf_file::modptr
caddr_t modptr
Definition: link_elf.c:103
elf_file::ddbsymcnt
long ddbsymcnt
Definition: link_elf.c:105
elf_file::lf
struct linker_file lf
Definition: link_elf.c:79
elf_file::relatab
Elf_relaent * relatab
Definition: link_elf_obj.c:105
elf_file::ctftab
caddr_t ctftab
Definition: link_elf.c:110
elf_file::ddbsymtab
const Elf_Sym * ddbsymtab
Definition: link_elf.c:104
elf_file::preloaded
int preloaded
Definition: link_elf.c:80
elf_file::reltab
Elf_relent * reltab
Definition: link_elf_obj.c:108
elf_file::ddbsymtab
Elf_Sym * ddbsymtab
Definition: link_elf_obj.c:111
elf_file::typlen
long typlen
Definition: link_elf.c:114
elf_file::object
vm_object_t object
Definition: link_elf_obj.c:99
elf_file::ctfoff
caddr_t ctfoff
Definition: link_elf.c:112
elf_file::ddbstrcnt
long ddbstrcnt
Definition: link_elf.c:107
preload_search_info
caddr_t preload_search_info(caddr_t mod, int inf)
Definition: subr_module.c:164
preload_search_by_name
caddr_t preload_search_by_name(const char *name)
Definition: subr_module.c:56
preload_delete_name
void preload_delete_name(const char *name)
Definition: subr_module.c:211
dpcpu_copy
void dpcpu_copy(void *s, int size)
Definition: subr_pcpu.c:250
dpcpu_alloc
void * dpcpu_alloc(int size)
Definition: subr_pcpu.c:165
dpcpu_free
void dpcpu_free(void *s, int size)
Definition: subr_pcpu.c:196
printf
int printf(const char *fmt,...)
Definition: subr_prf.c:397
flags
uint16_t flags
Definition: subr_stats.c:2
nbytes
size_t nbytes
Definition: vfs_extattr.c:718
NDFREE
void() NDFREE(struct nameidata *ndp, const u_int flags)
Definition: vfs_lookup.c:1555
vn_rdwr
int vn_rdwr(enum uio_rw rw, struct vnode *vp, void *base, int len, off_t offset, enum uio_seg segflg, int ioflg, struct ucred *active_cred, struct ucred *file_cred, ssize_t *aresid, struct thread *td)
Definition: vfs_vnops.c:614
vn_open
int vn_open(struct nameidata *ndp, int *flagp, int cmode, struct file *fp)
Definition: vfs_vnops.c:191
vn_close
int vn_close(struct vnode *vp, int flags, struct ucred *file_cred, struct thread *td)
Definition: vfs_vnops.c:553