1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 1998-2000 Doug Rabson
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
31
32 #include "opt_ddb.h"
33 #include "opt_gdb.h"
34
35 #include <sys/param.h>
36 #include <sys/systm.h>
37 #ifdef GPROF
38 #include <sys/gmon.h>
39 #endif
40 #include <sys/kernel.h>
41 #include <sys/lock.h>
42 #include <sys/malloc.h>
43 #ifdef SPARSE_MAPPING
44 #include <sys/mman.h>
45 #endif
46 #include <sys/mutex.h>
47 #include <sys/mount.h>
48 #include <sys/pcpu.h>
49 #include <sys/proc.h>
50 #include <sys/namei.h>
51 #include <sys/fcntl.h>
52 #include <sys/vnode.h>
53 #include <sys/linker.h>
54 #include <sys/sysctl.h>
55
56 #include <machine/elf.h>
57
58 #include <net/vnet.h>
59
60 #include <security/mac/mac_framework.h>
61
62 #include <vm/vm.h>
63 #include <vm/vm_param.h>
64 #ifdef SPARSE_MAPPING
65 #include <vm/vm_object.h>
66 #include <vm/vm_kern.h>
67 #include <vm/vm_extern.h>
68 #endif
69 #include <vm/pmap.h>
70 #include <vm/vm_map.h>
71
72 #include <sys/link_elf.h>
73
74 #include "linker_if.h"
75
76 #define MAXSEGS 4
77
78 typedef struct elf_file {
79 struct linker_file lf; /* Common fields */
80 int preloaded; /* Was file pre-loaded */
81 caddr_t address; /* Relocation address */
82 #ifdef SPARSE_MAPPING
83 vm_object_t object; /* VM object to hold file pages */
84 #endif
85 Elf_Dyn *dynamic; /* Symbol table etc. */
86 Elf_Hashelt nbuckets; /* DT_HASH info */
87 Elf_Hashelt nchains;
88 const Elf_Hashelt *buckets;
89 const Elf_Hashelt *chains;
90 caddr_t hash;
91 caddr_t strtab; /* DT_STRTAB */
92 int strsz; /* DT_STRSZ */
93 const Elf_Sym *symtab; /* DT_SYMTAB */
94 Elf_Addr *got; /* DT_PLTGOT */
95 const Elf_Rel *pltrel; /* DT_JMPREL */
96 int pltrelsize; /* DT_PLTRELSZ */
97 const Elf_Rela *pltrela; /* DT_JMPREL */
98 int pltrelasize; /* DT_PLTRELSZ */
99 const Elf_Rel *rel; /* DT_REL */
100 int relsize; /* DT_RELSZ */
101 const Elf_Rela *rela; /* DT_RELA */
102 int relasize; /* DT_RELASZ */
103 caddr_t modptr;
104 const Elf_Sym *ddbsymtab; /* The symbol table we are using */
105 long ddbsymcnt; /* Number of symbols */
106 caddr_t ddbstrtab; /* String table */
107 long ddbstrcnt; /* number of bytes in string table */
108 caddr_t symbase; /* malloc'ed symbold base */
109 caddr_t strbase; /* malloc'ed string base */
110 caddr_t ctftab; /* CTF table */
111 long ctfcnt; /* number of bytes in CTF table */
112 caddr_t ctfoff; /* CTF offset table */
113 caddr_t typoff; /* Type offset table */
114 long typlen; /* Number of type entries. */
115 Elf_Addr pcpu_start; /* Pre-relocation pcpu set start. */
116 Elf_Addr pcpu_stop; /* Pre-relocation pcpu set stop. */
117 Elf_Addr pcpu_base; /* Relocated pcpu set address. */
118 #ifdef VIMAGE
119 Elf_Addr vnet_start; /* Pre-relocation vnet set start. */
120 Elf_Addr vnet_stop; /* Pre-relocation vnet set stop. */
121 Elf_Addr vnet_base; /* Relocated vnet set address. */
122 #endif
123 #ifdef GDB
124 struct link_map gdb; /* hooks for gdb */
125 #endif
126 } *elf_file_t;
127
128 struct elf_set {
129 Elf_Addr es_start;
130 Elf_Addr es_stop;
131 Elf_Addr es_base;
132 TAILQ_ENTRY(elf_set) es_link;
133 };
134
135 TAILQ_HEAD(elf_set_head, elf_set);
136
137 #include <kern/kern_ctf.c>
138
139 static int link_elf_link_common_finish(linker_file_t);
140 static int link_elf_link_preload(linker_class_t cls,
141 const char *, linker_file_t *);
142 static int link_elf_link_preload_finish(linker_file_t);
143 static int link_elf_load_file(linker_class_t, const char *,
144 linker_file_t *);
145 static int link_elf_lookup_symbol(linker_file_t, const char *,
146 c_linker_sym_t *);
147 static int link_elf_symbol_values(linker_file_t, c_linker_sym_t,
148 linker_symval_t *);
149 static int link_elf_search_symbol(linker_file_t, caddr_t,
150 c_linker_sym_t *, long *);
151
152 static void link_elf_unload_file(linker_file_t);
153 static void link_elf_unload_preload(linker_file_t);
154 static int link_elf_lookup_set(linker_file_t, const char *,
155 void ***, void ***, int *);
156 static int link_elf_each_function_name(linker_file_t,
157 int (*)(const char *, void *), void *);
158 static int link_elf_each_function_nameval(linker_file_t,
159 linker_function_nameval_callback_t, void *);
160 static void link_elf_reloc_local(linker_file_t);
161 static long link_elf_symtab_get(linker_file_t, const Elf_Sym **);
162 static long link_elf_strtab_get(linker_file_t, caddr_t *);
163 static int elf_lookup(linker_file_t, Elf_Size, int, Elf_Addr *);
164
165 static kobj_method_t link_elf_methods[] = {
166 KOBJMETHOD(linker_lookup_symbol, link_elf_lookup_symbol),
167 KOBJMETHOD(linker_symbol_values, link_elf_symbol_values),
168 KOBJMETHOD(linker_search_symbol, link_elf_search_symbol),
169 KOBJMETHOD(linker_unload, link_elf_unload_file),
170 KOBJMETHOD(linker_load_file, link_elf_load_file),
171 KOBJMETHOD(linker_link_preload, link_elf_link_preload),
172 KOBJMETHOD(linker_link_preload_finish, link_elf_link_preload_finish),
173 KOBJMETHOD(linker_lookup_set, link_elf_lookup_set),
174 KOBJMETHOD(linker_each_function_name, link_elf_each_function_name),
175 KOBJMETHOD(linker_each_function_nameval, link_elf_each_function_nameval),
176 KOBJMETHOD(linker_ctf_get, link_elf_ctf_get),
177 KOBJMETHOD(linker_symtab_get, link_elf_symtab_get),
178 KOBJMETHOD(linker_strtab_get, link_elf_strtab_get),
179 KOBJMETHOD_END
180 };
181
182 static struct linker_class link_elf_class = {
183 #if ELF_TARG_CLASS == ELFCLASS32
184 "elf32",
185 #else
186 "elf64",
187 #endif
188 link_elf_methods, sizeof(struct elf_file)
189 };
190
191 typedef int (*elf_reloc_fn)(linker_file_t lf, Elf_Addr relocbase,
192 const void *data, int type, elf_lookup_fn lookup);
193
194 static int parse_dynamic(elf_file_t);
195 static int relocate_file(elf_file_t);
196 static int relocate_file1(elf_file_t ef, elf_lookup_fn lookup,
197 elf_reloc_fn reloc, bool ifuncs);
198 static int link_elf_preload_parse_symbols(elf_file_t);
199
200 static struct elf_set_head set_pcpu_list;
201 #ifdef VIMAGE
202 static struct elf_set_head set_vnet_list;
203 #endif
204
205 static void
elf_set_add(struct elf_set_head * list,Elf_Addr start,Elf_Addr stop,Elf_Addr base)206 elf_set_add(struct elf_set_head *list, Elf_Addr start, Elf_Addr stop, Elf_Addr base)
207 {
208 struct elf_set *set, *iter;
209
210 set = malloc(sizeof(*set), M_LINKER, M_WAITOK);
211 set->es_start = start;
212 set->es_stop = stop;
213 set->es_base = base;
214
215 TAILQ_FOREACH(iter, list, es_link) {
216 KASSERT((set->es_start < iter->es_start && set->es_stop < iter->es_stop) ||
217 (set->es_start > iter->es_start && set->es_stop > iter->es_stop),
218 ("linker sets intersection: to insert: 0x%jx-0x%jx; inserted: 0x%jx-0x%jx",
219 (uintmax_t)set->es_start, (uintmax_t)set->es_stop,
220 (uintmax_t)iter->es_start, (uintmax_t)iter->es_stop));
221
222 if (iter->es_start > set->es_start) {
223 TAILQ_INSERT_BEFORE(iter, set, es_link);
224 break;
225 }
226 }
227
228 if (iter == NULL)
229 TAILQ_INSERT_TAIL(list, set, es_link);
230 }
231
232 static int
elf_set_find(struct elf_set_head * list,Elf_Addr addr,Elf_Addr * start,Elf_Addr * base)233 elf_set_find(struct elf_set_head *list, Elf_Addr addr, Elf_Addr *start, Elf_Addr *base)
234 {
235 struct elf_set *set;
236
237 TAILQ_FOREACH(set, list, es_link) {
238 if (addr < set->es_start)
239 return (0);
240 if (addr < set->es_stop) {
241 *start = set->es_start;
242 *base = set->es_base;
243 return (1);
244 }
245 }
246
247 return (0);
248 }
249
250 static void
elf_set_delete(struct elf_set_head * list,Elf_Addr start)251 elf_set_delete(struct elf_set_head *list, Elf_Addr start)
252 {
253 struct elf_set *set;
254
255 TAILQ_FOREACH(set, list, es_link) {
256 if (start < set->es_start)
257 break;
258 if (start == set->es_start) {
259 TAILQ_REMOVE(list, set, es_link);
260 free(set, M_LINKER);
261 return;
262 }
263 }
264 KASSERT(0, ("deleting unknown linker set (start = 0x%jx)",
265 (uintmax_t)start));
266 }
267
268 #ifdef GDB
269 static void r_debug_state(struct r_debug *, struct link_map *);
270
271 /*
272 * A list of loaded modules for GDB to use for loading symbols.
273 */
274 struct r_debug r_debug;
275
276 #define GDB_STATE(s) do { \
277 r_debug.r_state = s; r_debug_state(NULL, NULL); \
278 } while (0)
279
280 /*
281 * Function for the debugger to set a breakpoint on to gain control.
282 */
283 static void
r_debug_state(struct r_debug * dummy_one __unused,struct link_map * dummy_two __unused)284 r_debug_state(struct r_debug *dummy_one __unused,
285 struct link_map *dummy_two __unused)
286 {
287 }
288
289 static void
link_elf_add_gdb(struct link_map * l)290 link_elf_add_gdb(struct link_map *l)
291 {
292 struct link_map *prev;
293
294 l->l_next = NULL;
295
296 if (r_debug.r_map == NULL) {
297 /* Add first. */
298 l->l_prev = NULL;
299 r_debug.r_map = l;
300 } else {
301 /* Append to list. */
302 for (prev = r_debug.r_map;
303 prev->l_next != NULL;
304 prev = prev->l_next)
305 ;
306 l->l_prev = prev;
307 prev->l_next = l;
308 }
309 }
310
311 static void
link_elf_delete_gdb(struct link_map * l)312 link_elf_delete_gdb(struct link_map *l)
313 {
314 if (l->l_prev == NULL) {
315 /* Remove first. */
316 if ((r_debug.r_map = l->l_next) != NULL)
317 l->l_next->l_prev = NULL;
318 } else {
319 /* Remove any but first. */
320 if ((l->l_prev->l_next = l->l_next) != NULL)
321 l->l_next->l_prev = l->l_prev;
322 }
323 }
324 #endif /* GDB */
325
326 /*
327 * The kernel symbol table starts here.
328 */
329 extern struct _dynamic _DYNAMIC;
330
331 static void
link_elf_error(const char * filename,const char * s)332 link_elf_error(const char *filename, const char *s)
333 {
334 if (filename == NULL)
335 printf("kldload: %s\n", s);
336 else
337 printf("kldload: %s: %s\n", filename, s);
338 }
339
340 static void
link_elf_invoke_ctors(caddr_t addr,size_t size)341 link_elf_invoke_ctors(caddr_t addr, size_t size)
342 {
343 void (**ctor)(void);
344 size_t i, cnt;
345
346 if (addr == NULL || size == 0)
347 return;
348 cnt = size / sizeof(*ctor);
349 ctor = (void *)addr;
350 for (i = 0; i < cnt; i++) {
351 if (ctor[i] != NULL)
352 (*ctor[i])();
353 }
354 }
355
356 /*
357 * Actions performed after linking/loading both the preloaded kernel and any
358 * modules; whether preloaded or dynamicly loaded.
359 */
360 static int
link_elf_link_common_finish(linker_file_t lf)361 link_elf_link_common_finish(linker_file_t lf)
362 {
363 #ifdef GDB
364 elf_file_t ef = (elf_file_t)lf;
365 char *newfilename;
366 #endif
367 int error;
368
369 /* Notify MD code that a module is being loaded. */
370 error = elf_cpu_load_file(lf);
371 if (error != 0)
372 return (error);
373
374 #ifdef GDB
375 GDB_STATE(RT_ADD);
376 ef->gdb.l_addr = lf->address;
377 newfilename = malloc(strlen(lf->filename) + 1, M_LINKER, M_WAITOK);
378 strcpy(newfilename, lf->filename);
379 ef->gdb.l_name = newfilename;
380 ef->gdb.l_ld = ef->dynamic;
381 link_elf_add_gdb(&ef->gdb);
382 GDB_STATE(RT_CONSISTENT);
383 #endif
384
385 /* Invoke .ctors */
386 link_elf_invoke_ctors(lf->ctors_addr, lf->ctors_size);
387 return (0);
388 }
389
390 #ifdef RELOCATABLE_KERNEL
391 /*
392 * __startkernel and __endkernel are symbols set up as relocation canaries.
393 *
394 * They are defined in locore to reference linker script symbols at the
395 * beginning and end of the LOAD area. This has the desired side effect of
396 * giving us variables that have relative relocations pointing at them, so
397 * relocation of the kernel object will cause the variables to be updated
398 * automatically by the runtime linker when we initialize.
399 *
400 * There are two main reasons to relocate the kernel:
401 * 1) If the loader needed to load the kernel at an alternate load address.
402 * 2) If the kernel is switching address spaces on machines like POWER9
403 * under Radix where the high bits of the effective address are used to
404 * differentiate between hypervisor, host, guest, and problem state.
405 */
406 extern vm_offset_t __startkernel, __endkernel;
407 #endif
408
409 static unsigned long kern_relbase = KERNBASE;
410
411 SYSCTL_ULONG(_kern, OID_AUTO, base_address, CTLFLAG_RD,
412 SYSCTL_NULL_ULONG_PTR, KERNBASE, "Kernel base address");
413 SYSCTL_ULONG(_kern, OID_AUTO, relbase_address, CTLFLAG_RD,
414 &kern_relbase, 0, "Kernel relocated base address");
415
416 static void
link_elf_init(void * arg)417 link_elf_init(void* arg)
418 {
419 Elf_Dyn *dp;
420 Elf_Addr *ctors_addrp;
421 Elf_Size *ctors_sizep;
422 caddr_t modptr, baseptr, sizeptr;
423 elf_file_t ef;
424 const char *modname;
425
426 linker_add_class(&link_elf_class);
427
428 dp = (Elf_Dyn *)&_DYNAMIC;
429 modname = NULL;
430 modptr = preload_search_by_type("elf" __XSTRING(__ELF_WORD_SIZE) " kernel");
431 if (modptr == NULL)
432 modptr = preload_search_by_type("elf kernel");
433 modname = (char *)preload_search_info(modptr, MODINFO_NAME);
434 if (modname == NULL)
435 modname = "kernel";
436 linker_kernel_file = linker_make_file(modname, &link_elf_class);
437 if (linker_kernel_file == NULL)
438 panic("%s: Can't create linker structures for kernel",
439 __func__);
440
441 ef = (elf_file_t) linker_kernel_file;
442 ef->preloaded = 1;
443 #ifdef RELOCATABLE_KERNEL
444 /* Compute relative displacement */
445 ef->address = (caddr_t) (__startkernel - KERNBASE);
446 #else
447 ef->address = 0;
448 #endif
449 #ifdef SPARSE_MAPPING
450 ef->object = NULL;
451 #endif
452 ef->dynamic = dp;
453
454 if (dp != NULL)
455 parse_dynamic(ef);
456 #ifdef RELOCATABLE_KERNEL
457 linker_kernel_file->address = (caddr_t)__startkernel;
458 linker_kernel_file->size = (intptr_t)(__endkernel - __startkernel);
459 kern_relbase = (unsigned long)__startkernel;
460 #else
461 linker_kernel_file->address += KERNBASE;
462 linker_kernel_file->size = -(intptr_t)linker_kernel_file->address;
463 #endif
464
465 if (modptr != NULL) {
466 ef->modptr = modptr;
467 baseptr = preload_search_info(modptr, MODINFO_ADDR);
468 if (baseptr != NULL)
469 linker_kernel_file->address = *(caddr_t *)baseptr;
470 sizeptr = preload_search_info(modptr, MODINFO_SIZE);
471 if (sizeptr != NULL)
472 linker_kernel_file->size = *(size_t *)sizeptr;
473 ctors_addrp = (Elf_Addr *)preload_search_info(modptr,
474 MODINFO_METADATA | MODINFOMD_CTORS_ADDR);
475 ctors_sizep = (Elf_Size *)preload_search_info(modptr,
476 MODINFO_METADATA | MODINFOMD_CTORS_SIZE);
477 if (ctors_addrp != NULL && ctors_sizep != NULL) {
478 linker_kernel_file->ctors_addr = ef->address +
479 *ctors_addrp;
480 linker_kernel_file->ctors_size = *ctors_sizep;
481 }
482 }
483 (void)link_elf_preload_parse_symbols(ef);
484
485 #ifdef GDB
486 r_debug.r_map = NULL;
487 r_debug.r_brk = r_debug_state;
488 r_debug.r_state = RT_CONSISTENT;
489 #endif
490
491 (void)link_elf_link_common_finish(linker_kernel_file);
492 linker_kernel_file->flags |= LINKER_FILE_LINKED;
493 TAILQ_INIT(&set_pcpu_list);
494 #ifdef VIMAGE
495 TAILQ_INIT(&set_vnet_list);
496 #endif
497 }
498
499 SYSINIT(link_elf, SI_SUB_KLD, SI_ORDER_THIRD, link_elf_init, NULL);
500
501 static int
link_elf_preload_parse_symbols(elf_file_t ef)502 link_elf_preload_parse_symbols(elf_file_t ef)
503 {
504 caddr_t pointer;
505 caddr_t ssym, esym, base;
506 caddr_t strtab;
507 int strcnt;
508 Elf_Sym *symtab;
509 int symcnt;
510
511 if (ef->modptr == NULL)
512 return (0);
513 pointer = preload_search_info(ef->modptr,
514 MODINFO_METADATA | MODINFOMD_SSYM);
515 if (pointer == NULL)
516 return (0);
517 ssym = *(caddr_t *)pointer;
518 pointer = preload_search_info(ef->modptr,
519 MODINFO_METADATA | MODINFOMD_ESYM);
520 if (pointer == NULL)
521 return (0);
522 esym = *(caddr_t *)pointer;
523
524 base = ssym;
525
526 symcnt = *(long *)base;
527 base += sizeof(long);
528 symtab = (Elf_Sym *)base;
529 base += roundup(symcnt, sizeof(long));
530
531 if (base > esym || base < ssym) {
532 printf("Symbols are corrupt!\n");
533 return (EINVAL);
534 }
535
536 strcnt = *(long *)base;
537 base += sizeof(long);
538 strtab = base;
539 base += roundup(strcnt, sizeof(long));
540
541 if (base > esym || base < ssym) {
542 printf("Symbols are corrupt!\n");
543 return (EINVAL);
544 }
545
546 ef->ddbsymtab = symtab;
547 ef->ddbsymcnt = symcnt / sizeof(Elf_Sym);
548 ef->ddbstrtab = strtab;
549 ef->ddbstrcnt = strcnt;
550
551 return (0);
552 }
553
554 static int
parse_dynamic(elf_file_t ef)555 parse_dynamic(elf_file_t ef)
556 {
557 Elf_Dyn *dp;
558 int plttype = DT_REL;
559
560 for (dp = ef->dynamic; dp->d_tag != DT_NULL; dp++) {
561 switch (dp->d_tag) {
562 case DT_HASH:
563 {
564 /* From src/libexec/rtld-elf/rtld.c */
565 const Elf_Hashelt *hashtab = (const Elf_Hashelt *)
566 (ef->address + dp->d_un.d_ptr);
567 ef->nbuckets = hashtab[0];
568 ef->nchains = hashtab[1];
569 ef->buckets = hashtab + 2;
570 ef->chains = ef->buckets + ef->nbuckets;
571 break;
572 }
573 case DT_STRTAB:
574 ef->strtab = (caddr_t) (ef->address + dp->d_un.d_ptr);
575 break;
576 case DT_STRSZ:
577 ef->strsz = dp->d_un.d_val;
578 break;
579 case DT_SYMTAB:
580 ef->symtab = (Elf_Sym*) (ef->address + dp->d_un.d_ptr);
581 break;
582 case DT_SYMENT:
583 if (dp->d_un.d_val != sizeof(Elf_Sym))
584 return (ENOEXEC);
585 break;
586 case DT_PLTGOT:
587 ef->got = (Elf_Addr *) (ef->address + dp->d_un.d_ptr);
588 break;
589 case DT_REL:
590 ef->rel = (const Elf_Rel *) (ef->address + dp->d_un.d_ptr);
591 break;
592 case DT_RELSZ:
593 ef->relsize = dp->d_un.d_val;
594 break;
595 case DT_RELENT:
596 if (dp->d_un.d_val != sizeof(Elf_Rel))
597 return (ENOEXEC);
598 break;
599 case DT_JMPREL:
600 ef->pltrel = (const Elf_Rel *) (ef->address + dp->d_un.d_ptr);
601 break;
602 case DT_PLTRELSZ:
603 ef->pltrelsize = dp->d_un.d_val;
604 break;
605 case DT_RELA:
606 ef->rela = (const Elf_Rela *) (ef->address + dp->d_un.d_ptr);
607 break;
608 case DT_RELASZ:
609 ef->relasize = dp->d_un.d_val;
610 break;
611 case DT_RELAENT:
612 if (dp->d_un.d_val != sizeof(Elf_Rela))
613 return (ENOEXEC);
614 break;
615 case DT_PLTREL:
616 plttype = dp->d_un.d_val;
617 if (plttype != DT_REL && plttype != DT_RELA)
618 return (ENOEXEC);
619 break;
620 #ifdef GDB
621 case DT_DEBUG:
622 dp->d_un.d_ptr = (Elf_Addr)&r_debug;
623 break;
624 #endif
625 }
626 }
627
628 if (plttype == DT_RELA) {
629 ef->pltrela = (const Elf_Rela *)ef->pltrel;
630 ef->pltrel = NULL;
631 ef->pltrelasize = ef->pltrelsize;
632 ef->pltrelsize = 0;
633 }
634
635 ef->ddbsymtab = ef->symtab;
636 ef->ddbsymcnt = ef->nchains;
637 ef->ddbstrtab = ef->strtab;
638 ef->ddbstrcnt = ef->strsz;
639
640 #ifndef FSTACK
641 return elf_cpu_parse_dynamic(ef->address, ef->dynamic);
642 #else
643 return 0;
644 #endif
645 }
646
647 #define LS_PADDING 0x90909090
648 static int
parse_dpcpu(elf_file_t ef)649 parse_dpcpu(elf_file_t ef)
650 {
651 int error, size;
652 #if defined(__i386__)
653 uint32_t pad;
654 #endif
655
656 ef->pcpu_start = 0;
657 ef->pcpu_stop = 0;
658 error = link_elf_lookup_set(&ef->lf, "pcpu", (void ***)&ef->pcpu_start,
659 (void ***)&ef->pcpu_stop, NULL);
660 /* Error just means there is no pcpu set to relocate. */
661 if (error != 0)
662 return (0);
663 size = (uintptr_t)ef->pcpu_stop - (uintptr_t)ef->pcpu_start;
664 /* Empty set? */
665 if (size < 1)
666 return (0);
667 #if defined(__i386__)
668 /* In case we do find __start/stop_set_ symbols double-check. */
669 if (size < 4) {
670 uprintf("Kernel module '%s' must be recompiled with "
671 "linker script\n", ef->lf.pathname);
672 return (ENOEXEC);
673 }
674
675 /* Padding from linker-script correct? */
676 pad = *(uint32_t *)((uintptr_t)ef->pcpu_stop - sizeof(pad));
677 if (pad != LS_PADDING) {
678 uprintf("Kernel module '%s' must be recompiled with "
679 "linker script, invalid padding %#04x (%#04x)\n",
680 ef->lf.pathname, pad, LS_PADDING);
681 return (ENOEXEC);
682 }
683 /* If we only have valid padding, nothing to do. */
684 if (size == 4)
685 return (0);
686 #endif
687 /*
688 * Allocate space in the primary pcpu area. Copy in our
689 * initialization from the data section and then initialize
690 * all per-cpu storage from that.
691 */
692 ef->pcpu_base = (Elf_Addr)(uintptr_t)dpcpu_alloc(size);
693 if (ef->pcpu_base == 0) {
694 printf("%s: pcpu module space is out of space; "
695 "cannot allocate %d for %s\n",
696 __func__, size, ef->lf.pathname);
697 return (ENOSPC);
698 }
699 memcpy((void *)ef->pcpu_base, (void *)ef->pcpu_start, size);
700 dpcpu_copy((void *)ef->pcpu_base, size);
701 elf_set_add(&set_pcpu_list, ef->pcpu_start, ef->pcpu_stop,
702 ef->pcpu_base);
703
704 return (0);
705 }
706
707 #ifdef VIMAGE
708 static int
parse_vnet(elf_file_t ef)709 parse_vnet(elf_file_t ef)
710 {
711 int error, size;
712 #if defined(__i386__)
713 uint32_t pad;
714 #endif
715
716 ef->vnet_start = 0;
717 ef->vnet_stop = 0;
718 error = link_elf_lookup_set(&ef->lf, "vnet", (void ***)&ef->vnet_start,
719 (void ***)&ef->vnet_stop, NULL);
720 /* Error just means there is no vnet data set to relocate. */
721 if (error != 0)
722 return (0);
723 size = (uintptr_t)ef->vnet_stop - (uintptr_t)ef->vnet_start;
724 /* Empty set? */
725 if (size < 1)
726 return (0);
727 #if defined(__i386__)
728 /* In case we do find __start/stop_set_ symbols double-check. */
729 if (size < 4) {
730 uprintf("Kernel module '%s' must be recompiled with "
731 "linker script\n", ef->lf.pathname);
732 return (ENOEXEC);
733 }
734
735 /* Padding from linker-script correct? */
736 pad = *(uint32_t *)((uintptr_t)ef->vnet_stop - sizeof(pad));
737 if (pad != LS_PADDING) {
738 uprintf("Kernel module '%s' must be recompiled with "
739 "linker script, invalid padding %#04x (%#04x)\n",
740 ef->lf.pathname, pad, LS_PADDING);
741 return (ENOEXEC);
742 }
743 /* If we only have valid padding, nothing to do. */
744 if (size == 4)
745 return (0);
746 #endif
747 /*
748 * Allocate space in the primary vnet area. Copy in our
749 * initialization from the data section and then initialize
750 * all per-vnet storage from that.
751 */
752 ef->vnet_base = (Elf_Addr)(uintptr_t)vnet_data_alloc(size);
753 if (ef->vnet_base == 0) {
754 printf("%s: vnet module space is out of space; "
755 "cannot allocate %d for %s\n",
756 __func__, size, ef->lf.pathname);
757 return (ENOSPC);
758 }
759 memcpy((void *)ef->vnet_base, (void *)ef->vnet_start, size);
760 vnet_data_copy((void *)ef->vnet_base, size);
761 elf_set_add(&set_vnet_list, ef->vnet_start, ef->vnet_stop,
762 ef->vnet_base);
763
764 return (0);
765 }
766 #endif
767 #undef LS_PADDING
768
769 /*
770 * Apply the specified protection to the loadable segments of a preloaded linker
771 * file.
772 */
773 static int
preload_protect(elf_file_t ef,vm_prot_t prot)774 preload_protect(elf_file_t ef, vm_prot_t prot)
775 {
776 #ifdef __amd64__
777 Elf_Ehdr *hdr;
778 Elf_Phdr *phdr, *phlimit;
779 vm_prot_t nprot;
780 int error;
781
782 error = 0;
783 hdr = (Elf_Ehdr *)ef->address;
784 phdr = (Elf_Phdr *)(ef->address + hdr->e_phoff);
785 phlimit = phdr + hdr->e_phnum;
786 for (; phdr < phlimit; phdr++) {
787 if (phdr->p_type != PT_LOAD)
788 continue;
789
790 nprot = prot | VM_PROT_READ;
791 if ((phdr->p_flags & PF_W) != 0)
792 nprot |= VM_PROT_WRITE;
793 if ((phdr->p_flags & PF_X) != 0)
794 nprot |= VM_PROT_EXECUTE;
795 error = pmap_change_prot((vm_offset_t)ef->address +
796 phdr->p_vaddr, round_page(phdr->p_memsz), nprot);
797 if (error != 0)
798 break;
799 }
800 return (error);
801 #else
802 return (0);
803 #endif
804 }
805
806 #ifdef __arm__
807 /*
808 * Locate the ARM exception/unwind table info for DDB and stack(9) use by
809 * searching for the section header that describes it. There may be no unwind
810 * info, for example in a module containing only data.
811 */
812 static void
link_elf_locate_exidx(linker_file_t lf,Elf_Shdr * shdr,int nhdr)813 link_elf_locate_exidx(linker_file_t lf, Elf_Shdr *shdr, int nhdr)
814 {
815 int i;
816
817 for (i = 0; i < nhdr; i++) {
818 if (shdr[i].sh_type == SHT_ARM_EXIDX) {
819 lf->exidx_addr = shdr[i].sh_addr + lf->address;
820 lf->exidx_size = shdr[i].sh_size;
821 break;
822 }
823 }
824 }
825
826 /*
827 * Locate the section headers metadata in a preloaded module, then use it to
828 * locate the exception/unwind table in the module. The size of the metadata
829 * block is stored in a uint32 word immediately before the data itself, and a
830 * comment in preload_search_info() says it is safe to rely on that.
831 */
832 static void
link_elf_locate_exidx_preload(struct linker_file * lf,caddr_t modptr)833 link_elf_locate_exidx_preload(struct linker_file *lf, caddr_t modptr)
834 {
835 uint32_t *modinfo;
836 Elf_Shdr *shdr;
837 uint32_t nhdr;
838
839 modinfo = (uint32_t *)preload_search_info(modptr,
840 MODINFO_METADATA | MODINFOMD_SHDR);
841 if (modinfo != NULL) {
842 shdr = (Elf_Shdr *)modinfo;
843 nhdr = modinfo[-1] / sizeof(Elf_Shdr);
844 link_elf_locate_exidx(lf, shdr, nhdr);
845 }
846 }
847
848 #endif /* __arm__ */
849
850 static int
link_elf_link_preload(linker_class_t cls,const char * filename,linker_file_t * result)851 link_elf_link_preload(linker_class_t cls, const char *filename,
852 linker_file_t *result)
853 {
854 Elf_Addr *ctors_addrp;
855 Elf_Size *ctors_sizep;
856 caddr_t modptr, baseptr, sizeptr, dynptr;
857 char *type;
858 elf_file_t ef;
859 linker_file_t lf;
860 int error;
861 vm_offset_t dp;
862
863 /* Look to see if we have the file preloaded */
864 modptr = preload_search_by_name(filename);
865 if (modptr == NULL)
866 return (ENOENT);
867
868 type = (char *)preload_search_info(modptr, MODINFO_TYPE);
869 baseptr = preload_search_info(modptr, MODINFO_ADDR);
870 sizeptr = preload_search_info(modptr, MODINFO_SIZE);
871 dynptr = preload_search_info(modptr,
872 MODINFO_METADATA | MODINFOMD_DYNAMIC);
873 if (type == NULL ||
874 (strcmp(type, "elf" __XSTRING(__ELF_WORD_SIZE) " module") != 0 &&
875 strcmp(type, "elf module") != 0))
876 return (EFTYPE);
877 if (baseptr == NULL || sizeptr == NULL || dynptr == NULL)
878 return (EINVAL);
879
880 lf = linker_make_file(filename, &link_elf_class);
881 if (lf == NULL)
882 return (ENOMEM);
883
884 ef = (elf_file_t) lf;
885 ef->preloaded = 1;
886 ef->modptr = modptr;
887 ef->address = *(caddr_t *)baseptr;
888 #ifdef SPARSE_MAPPING
889 ef->object = NULL;
890 #endif
891 dp = (vm_offset_t)ef->address + *(vm_offset_t *)dynptr;
892 ef->dynamic = (Elf_Dyn *)dp;
893 lf->address = ef->address;
894 lf->size = *(size_t *)sizeptr;
895
896 ctors_addrp = (Elf_Addr *)preload_search_info(modptr,
897 MODINFO_METADATA | MODINFOMD_CTORS_ADDR);
898 ctors_sizep = (Elf_Size *)preload_search_info(modptr,
899 MODINFO_METADATA | MODINFOMD_CTORS_SIZE);
900 if (ctors_addrp != NULL && ctors_sizep != NULL) {
901 lf->ctors_addr = ef->address + *ctors_addrp;
902 lf->ctors_size = *ctors_sizep;
903 }
904
905 #ifdef __arm__
906 link_elf_locate_exidx_preload(lf, modptr);
907 #endif
908
909 error = parse_dynamic(ef);
910 if (error == 0)
911 error = parse_dpcpu(ef);
912 #ifdef VIMAGE
913 if (error == 0)
914 error = parse_vnet(ef);
915 #endif
916 if (error == 0)
917 error = preload_protect(ef, VM_PROT_ALL);
918 if (error != 0) {
919 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
920 return (error);
921 }
922 link_elf_reloc_local(lf);
923 *result = lf;
924 return (0);
925 }
926
927 static int
link_elf_link_preload_finish(linker_file_t lf)928 link_elf_link_preload_finish(linker_file_t lf)
929 {
930 elf_file_t ef;
931 int error;
932
933 ef = (elf_file_t) lf;
934 error = relocate_file(ef);
935 if (error == 0)
936 error = preload_protect(ef, VM_PROT_NONE);
937 if (error != 0)
938 return (error);
939 (void)link_elf_preload_parse_symbols(ef);
940
941 return (link_elf_link_common_finish(lf));
942 }
943
944 static int
link_elf_load_file(linker_class_t cls,const char * filename,linker_file_t * result)945 link_elf_load_file(linker_class_t cls, const char* filename,
946 linker_file_t* result)
947 {
948 struct nameidata nd;
949 struct thread* td = curthread; /* XXX */
950 Elf_Ehdr *hdr;
951 caddr_t firstpage, segbase;
952 int nbytes, i;
953 Elf_Phdr *phdr;
954 Elf_Phdr *phlimit;
955 Elf_Phdr *segs[MAXSEGS];
956 int nsegs;
957 Elf_Phdr *phdyn;
958 caddr_t mapbase;
959 size_t mapsize;
960 Elf_Addr base_vaddr;
961 Elf_Addr base_vlimit;
962 int error = 0;
963 ssize_t resid;
964 int flags;
965 elf_file_t ef;
966 linker_file_t lf;
967 Elf_Shdr *shdr;
968 int symtabindex;
969 int symstrindex;
970 int shstrindex;
971 int symcnt;
972 int strcnt;
973 char *shstrs;
974
975 shdr = NULL;
976 lf = NULL;
977 shstrs = NULL;
978
979 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, filename, td);
980 flags = FREAD;
981 error = vn_open(&nd, &flags, 0, NULL);
982 if (error != 0)
983 return (error);
984 NDFREE(&nd, NDF_ONLY_PNBUF);
985 if (nd.ni_vp->v_type != VREG) {
986 error = ENOEXEC;
987 firstpage = NULL;
988 goto out;
989 }
990 #ifdef MAC
991 error = mac_kld_check_load(curthread->td_ucred, nd.ni_vp);
992 if (error != 0) {
993 firstpage = NULL;
994 goto out;
995 }
996 #endif
997
998 /*
999 * Read the elf header from the file.
1000 */
1001 firstpage = malloc(PAGE_SIZE, M_LINKER, M_WAITOK);
1002 hdr = (Elf_Ehdr *)firstpage;
1003 error = vn_rdwr(UIO_READ, nd.ni_vp, firstpage, PAGE_SIZE, 0,
1004 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
1005 &resid, td);
1006 nbytes = PAGE_SIZE - resid;
1007 if (error != 0)
1008 goto out;
1009
1010 if (!IS_ELF(*hdr)) {
1011 error = ENOEXEC;
1012 goto out;
1013 }
1014
1015 if (hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS ||
1016 hdr->e_ident[EI_DATA] != ELF_TARG_DATA) {
1017 link_elf_error(filename, "Unsupported file layout");
1018 error = ENOEXEC;
1019 goto out;
1020 }
1021 if (hdr->e_ident[EI_VERSION] != EV_CURRENT ||
1022 hdr->e_version != EV_CURRENT) {
1023 link_elf_error(filename, "Unsupported file version");
1024 error = ENOEXEC;
1025 goto out;
1026 }
1027 if (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN) {
1028 error = ENOSYS;
1029 goto out;
1030 }
1031 if (hdr->e_machine != ELF_TARG_MACH) {
1032 link_elf_error(filename, "Unsupported machine");
1033 error = ENOEXEC;
1034 goto out;
1035 }
1036
1037 /*
1038 * We rely on the program header being in the first page.
1039 * This is not strictly required by the ABI specification, but
1040 * it seems to always true in practice. And, it simplifies
1041 * things considerably.
1042 */
1043 if (!((hdr->e_phentsize == sizeof(Elf_Phdr)) &&
1044 (hdr->e_phoff + hdr->e_phnum*sizeof(Elf_Phdr) <= PAGE_SIZE) &&
1045 (hdr->e_phoff + hdr->e_phnum*sizeof(Elf_Phdr) <= nbytes)))
1046 link_elf_error(filename, "Unreadable program headers");
1047
1048 /*
1049 * Scan the program header entries, and save key information.
1050 *
1051 * We rely on there being exactly two load segments, text and data,
1052 * in that order.
1053 */
1054 phdr = (Elf_Phdr *) (firstpage + hdr->e_phoff);
1055 phlimit = phdr + hdr->e_phnum;
1056 nsegs = 0;
1057 phdyn = NULL;
1058 while (phdr < phlimit) {
1059 switch (phdr->p_type) {
1060 case PT_LOAD:
1061 if (nsegs == MAXSEGS) {
1062 link_elf_error(filename, "Too many sections");
1063 error = ENOEXEC;
1064 goto out;
1065 }
1066 /*
1067 * XXX: We just trust they come in right order ??
1068 */
1069 segs[nsegs] = phdr;
1070 ++nsegs;
1071 break;
1072
1073 case PT_DYNAMIC:
1074 phdyn = phdr;
1075 break;
1076
1077 case PT_INTERP:
1078 error = ENOSYS;
1079 goto out;
1080 }
1081
1082 ++phdr;
1083 }
1084 if (phdyn == NULL) {
1085 link_elf_error(filename, "Object is not dynamically-linked");
1086 error = ENOEXEC;
1087 goto out;
1088 }
1089 if (nsegs == 0) {
1090 link_elf_error(filename, "No sections");
1091 error = ENOEXEC;
1092 goto out;
1093 }
1094
1095 /*
1096 * Allocate the entire address space of the object, to stake
1097 * out our contiguous region, and to establish the base
1098 * address for relocation.
1099 */
1100 base_vaddr = trunc_page(segs[0]->p_vaddr);
1101 base_vlimit = round_page(segs[nsegs - 1]->p_vaddr +
1102 segs[nsegs - 1]->p_memsz);
1103 mapsize = base_vlimit - base_vaddr;
1104
1105 lf = linker_make_file(filename, &link_elf_class);
1106 if (lf == NULL) {
1107 error = ENOMEM;
1108 goto out;
1109 }
1110
1111 ef = (elf_file_t) lf;
1112 #ifdef SPARSE_MAPPING
1113 ef->object = vm_pager_allocate(OBJT_PHYS, NULL, mapsize, VM_PROT_ALL,
1114 0, thread0.td_ucred);
1115 if (ef->object == NULL) {
1116 error = ENOMEM;
1117 goto out;
1118 }
1119 #ifdef __amd64__
1120 mapbase = (caddr_t)KERNBASE;
1121 #else
1122 mapbase = (caddr_t)vm_map_min(kernel_map);
1123 #endif
1124 /*
1125 * Mapping protections are downgraded after relocation processing.
1126 */
1127 error = vm_map_find(kernel_map, ef->object, 0,
1128 (vm_offset_t *)&mapbase, mapsize, 0, VMFS_OPTIMAL_SPACE,
1129 VM_PROT_ALL, VM_PROT_ALL, 0);
1130 if (error != 0) {
1131 vm_object_deallocate(ef->object);
1132 ef->object = NULL;
1133 goto out;
1134 }
1135 #else
1136 mapbase = malloc_exec(mapsize, M_LINKER, M_WAITOK);
1137 #endif
1138 ef->address = mapbase;
1139
1140 /*
1141 * Read the text and data sections and zero the bss.
1142 */
1143 for (i = 0; i < nsegs; i++) {
1144 segbase = mapbase + segs[i]->p_vaddr - base_vaddr;
1145
1146 #ifdef SPARSE_MAPPING
1147 /*
1148 * Consecutive segments may have different mapping permissions,
1149 * so be strict and verify that their mappings do not overlap.
1150 */
1151 if (((vm_offset_t)segbase & PAGE_MASK) != 0) {
1152 error = EINVAL;
1153 goto out;
1154 }
1155
1156 error = vm_map_wire(kernel_map,
1157 (vm_offset_t)segbase,
1158 (vm_offset_t)segbase + round_page(segs[i]->p_memsz),
1159 VM_MAP_WIRE_SYSTEM | VM_MAP_WIRE_NOHOLES);
1160 if (error != KERN_SUCCESS) {
1161 error = ENOMEM;
1162 goto out;
1163 }
1164 #endif
1165
1166 error = vn_rdwr(UIO_READ, nd.ni_vp,
1167 segbase, segs[i]->p_filesz, segs[i]->p_offset,
1168 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
1169 &resid, td);
1170 if (error != 0)
1171 goto out;
1172 bzero(segbase + segs[i]->p_filesz,
1173 segs[i]->p_memsz - segs[i]->p_filesz);
1174 }
1175
1176 #ifdef GPROF
1177 /* Update profiling information with the new text segment. */
1178 mtx_lock(&Giant);
1179 kmupetext((uintfptr_t)(mapbase + segs[0]->p_vaddr - base_vaddr +
1180 segs[0]->p_memsz));
1181 mtx_unlock(&Giant);
1182 #endif
1183
1184 ef->dynamic = (Elf_Dyn *) (mapbase + phdyn->p_vaddr - base_vaddr);
1185
1186 lf->address = ef->address;
1187 lf->size = mapsize;
1188
1189 error = parse_dynamic(ef);
1190 if (error != 0)
1191 goto out;
1192 error = parse_dpcpu(ef);
1193 if (error != 0)
1194 goto out;
1195 #ifdef VIMAGE
1196 error = parse_vnet(ef);
1197 if (error != 0)
1198 goto out;
1199 #endif
1200 link_elf_reloc_local(lf);
1201
1202 VOP_UNLOCK(nd.ni_vp);
1203 error = linker_load_dependencies(lf);
1204 vn_lock(nd.ni_vp, LK_EXCLUSIVE | LK_RETRY);
1205 if (error != 0)
1206 goto out;
1207 error = relocate_file(ef);
1208 if (error != 0)
1209 goto out;
1210
1211 #ifdef SPARSE_MAPPING
1212 /*
1213 * Downgrade permissions on text segment mappings now that relocation
1214 * processing is complete. Restrict permissions on read-only segments.
1215 */
1216 for (i = 0; i < nsegs; i++) {
1217 vm_prot_t prot;
1218
1219 if (segs[i]->p_type != PT_LOAD)
1220 continue;
1221
1222 prot = VM_PROT_READ;
1223 if ((segs[i]->p_flags & PF_W) != 0)
1224 prot |= VM_PROT_WRITE;
1225 if ((segs[i]->p_flags & PF_X) != 0)
1226 prot |= VM_PROT_EXECUTE;
1227 segbase = mapbase + segs[i]->p_vaddr - base_vaddr;
1228 error = vm_map_protect(kernel_map,
1229 (vm_offset_t)segbase,
1230 (vm_offset_t)segbase + round_page(segs[i]->p_memsz),
1231 prot, 0, VM_MAP_PROTECT_SET_PROT);
1232 if (error != KERN_SUCCESS) {
1233 error = ENOMEM;
1234 goto out;
1235 }
1236 }
1237 #endif
1238
1239 /*
1240 * Try and load the symbol table if it's present. (you can
1241 * strip it!)
1242 */
1243 nbytes = hdr->e_shnum * hdr->e_shentsize;
1244 if (nbytes == 0 || hdr->e_shoff == 0)
1245 goto nosyms;
1246 shdr = malloc(nbytes, M_LINKER, M_WAITOK | M_ZERO);
1247 error = vn_rdwr(UIO_READ, nd.ni_vp,
1248 (caddr_t)shdr, nbytes, hdr->e_shoff,
1249 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
1250 &resid, td);
1251 if (error != 0)
1252 goto out;
1253
1254 /* Read section string table */
1255 shstrindex = hdr->e_shstrndx;
1256 if (shstrindex != 0 && shdr[shstrindex].sh_type == SHT_STRTAB &&
1257 shdr[shstrindex].sh_size != 0) {
1258 nbytes = shdr[shstrindex].sh_size;
1259 shstrs = malloc(nbytes, M_LINKER, M_WAITOK | M_ZERO);
1260 error = vn_rdwr(UIO_READ, nd.ni_vp, (caddr_t)shstrs, nbytes,
1261 shdr[shstrindex].sh_offset, UIO_SYSSPACE, IO_NODELOCKED,
1262 td->td_ucred, NOCRED, &resid, td);
1263 if (error)
1264 goto out;
1265 }
1266
1267 symtabindex = -1;
1268 symstrindex = -1;
1269 for (i = 0; i < hdr->e_shnum; i++) {
1270 if (shdr[i].sh_type == SHT_SYMTAB) {
1271 symtabindex = i;
1272 symstrindex = shdr[i].sh_link;
1273 } else if (shstrs != NULL && shdr[i].sh_name != 0 &&
1274 strcmp(shstrs + shdr[i].sh_name, ".ctors") == 0) {
1275 /* Record relocated address and size of .ctors. */
1276 lf->ctors_addr = mapbase + shdr[i].sh_addr - base_vaddr;
1277 lf->ctors_size = shdr[i].sh_size;
1278 }
1279 }
1280 if (symtabindex < 0 || symstrindex < 0)
1281 goto nosyms;
1282
1283 symcnt = shdr[symtabindex].sh_size;
1284 ef->symbase = malloc(symcnt, M_LINKER, M_WAITOK);
1285 strcnt = shdr[symstrindex].sh_size;
1286 ef->strbase = malloc(strcnt, M_LINKER, M_WAITOK);
1287
1288 error = vn_rdwr(UIO_READ, nd.ni_vp,
1289 ef->symbase, symcnt, shdr[symtabindex].sh_offset,
1290 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
1291 &resid, td);
1292 if (error != 0)
1293 goto out;
1294 error = vn_rdwr(UIO_READ, nd.ni_vp,
1295 ef->strbase, strcnt, shdr[symstrindex].sh_offset,
1296 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
1297 &resid, td);
1298 if (error != 0)
1299 goto out;
1300
1301 ef->ddbsymcnt = symcnt / sizeof(Elf_Sym);
1302 ef->ddbsymtab = (const Elf_Sym *)ef->symbase;
1303 ef->ddbstrcnt = strcnt;
1304 ef->ddbstrtab = ef->strbase;
1305
1306 nosyms:
1307
1308 #ifdef __arm__
1309 link_elf_locate_exidx(lf, shdr, hdr->e_shnum);
1310 #endif
1311
1312 error = link_elf_link_common_finish(lf);
1313 if (error != 0)
1314 goto out;
1315
1316 *result = lf;
1317
1318 out:
1319 VOP_UNLOCK(nd.ni_vp);
1320 vn_close(nd.ni_vp, FREAD, td->td_ucred, td);
1321 if (error != 0 && lf != NULL)
1322 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
1323 free(shdr, M_LINKER);
1324 free(firstpage, M_LINKER);
1325 free(shstrs, M_LINKER);
1326
1327 return (error);
1328 }
1329
1330 Elf_Addr
elf_relocaddr(linker_file_t lf,Elf_Addr x)1331 elf_relocaddr(linker_file_t lf, Elf_Addr x)
1332 {
1333 elf_file_t ef;
1334
1335 KASSERT(lf->ops->cls == (kobj_class_t)&link_elf_class,
1336 ("elf_relocaddr: unexpected linker file %p", lf));
1337
1338 ef = (elf_file_t)lf;
1339 if (x >= ef->pcpu_start && x < ef->pcpu_stop)
1340 return ((x - ef->pcpu_start) + ef->pcpu_base);
1341 #ifdef VIMAGE
1342 if (x >= ef->vnet_start && x < ef->vnet_stop)
1343 return ((x - ef->vnet_start) + ef->vnet_base);
1344 #endif
1345 return (x);
1346 }
1347
1348 static void
link_elf_unload_file(linker_file_t file)1349 link_elf_unload_file(linker_file_t file)
1350 {
1351 elf_file_t ef = (elf_file_t) file;
1352
1353 if (ef->pcpu_base != 0) {
1354 dpcpu_free((void *)ef->pcpu_base,
1355 ef->pcpu_stop - ef->pcpu_start);
1356 elf_set_delete(&set_pcpu_list, ef->pcpu_start);
1357 }
1358 #ifdef VIMAGE
1359 if (ef->vnet_base != 0) {
1360 vnet_data_free((void *)ef->vnet_base,
1361 ef->vnet_stop - ef->vnet_start);
1362 elf_set_delete(&set_vnet_list, ef->vnet_start);
1363 }
1364 #endif
1365 #ifdef GDB
1366 if (ef->gdb.l_ld != NULL) {
1367 GDB_STATE(RT_DELETE);
1368 free((void *)(uintptr_t)ef->gdb.l_name, M_LINKER);
1369 link_elf_delete_gdb(&ef->gdb);
1370 GDB_STATE(RT_CONSISTENT);
1371 }
1372 #endif
1373
1374 /* Notify MD code that a module is being unloaded. */
1375 elf_cpu_unload_file(file);
1376
1377 if (ef->preloaded) {
1378 link_elf_unload_preload(file);
1379 return;
1380 }
1381
1382 #ifdef SPARSE_MAPPING
1383 if (ef->object != NULL) {
1384 vm_map_remove(kernel_map, (vm_offset_t) ef->address,
1385 (vm_offset_t) ef->address
1386 + (ef->object->size << PAGE_SHIFT));
1387 }
1388 #else
1389 free(ef->address, M_LINKER);
1390 #endif
1391 free(ef->symbase, M_LINKER);
1392 free(ef->strbase, M_LINKER);
1393 free(ef->ctftab, M_LINKER);
1394 free(ef->ctfoff, M_LINKER);
1395 free(ef->typoff, M_LINKER);
1396 }
1397
1398 static void
link_elf_unload_preload(linker_file_t file)1399 link_elf_unload_preload(linker_file_t file)
1400 {
1401
1402 if (file->pathname != NULL)
1403 preload_delete_name(file->pathname);
1404 }
1405
1406 static const char *
symbol_name(elf_file_t ef,Elf_Size r_info)1407 symbol_name(elf_file_t ef, Elf_Size r_info)
1408 {
1409 const Elf_Sym *ref;
1410
1411 if (ELF_R_SYM(r_info)) {
1412 ref = ef->symtab + ELF_R_SYM(r_info);
1413 return (ef->strtab + ref->st_name);
1414 }
1415 return (NULL);
1416 }
1417
1418 static int
symbol_type(elf_file_t ef,Elf_Size r_info)1419 symbol_type(elf_file_t ef, Elf_Size r_info)
1420 {
1421 const Elf_Sym *ref;
1422
1423 if (ELF_R_SYM(r_info)) {
1424 ref = ef->symtab + ELF_R_SYM(r_info);
1425 return (ELF_ST_TYPE(ref->st_info));
1426 }
1427 return (STT_NOTYPE);
1428 }
1429
1430 static int
relocate_file1(elf_file_t ef,elf_lookup_fn lookup,elf_reloc_fn reloc,bool ifuncs)1431 relocate_file1(elf_file_t ef, elf_lookup_fn lookup, elf_reloc_fn reloc,
1432 bool ifuncs)
1433 {
1434 const Elf_Rel *rel;
1435 const Elf_Rela *rela;
1436 const char *symname;
1437
1438 #define APPLY_RELOCS(iter, tbl, tblsize, type) do { \
1439 for ((iter) = (tbl); (iter) != NULL && \
1440 (iter) < (tbl) + (tblsize) / sizeof(*(iter)); (iter)++) { \
1441 if ((symbol_type(ef, (iter)->r_info) == \
1442 STT_GNU_IFUNC || \
1443 elf_is_ifunc_reloc((iter)->r_info)) != ifuncs) \
1444 continue; \
1445 if (reloc(&ef->lf, (Elf_Addr)ef->address, \
1446 (iter), (type), lookup)) { \
1447 symname = symbol_name(ef, (iter)->r_info); \
1448 printf("link_elf: symbol %s undefined\n", \
1449 symname); \
1450 return (ENOENT); \
1451 } \
1452 } \
1453 } while (0)
1454
1455 APPLY_RELOCS(rel, ef->rel, ef->relsize, ELF_RELOC_REL);
1456 APPLY_RELOCS(rela, ef->rela, ef->relasize, ELF_RELOC_RELA);
1457 APPLY_RELOCS(rel, ef->pltrel, ef->pltrelsize, ELF_RELOC_REL);
1458 APPLY_RELOCS(rela, ef->pltrela, ef->pltrelasize, ELF_RELOC_RELA);
1459
1460 #undef APPLY_RELOCS
1461
1462 return (0);
1463 }
1464
1465 static int
relocate_file(elf_file_t ef)1466 relocate_file(elf_file_t ef)
1467 {
1468 int error;
1469
1470 error = relocate_file1(ef, elf_lookup, elf_reloc, false);
1471 if (error == 0)
1472 error = relocate_file1(ef, elf_lookup, elf_reloc, true);
1473 return (error);
1474 }
1475
1476 /*
1477 * Hash function for symbol table lookup. Don't even think about changing
1478 * this. It is specified by the System V ABI.
1479 */
1480 static unsigned long
elf_hash(const char * name)1481 elf_hash(const char *name)
1482 {
1483 const unsigned char *p = (const unsigned char *) name;
1484 unsigned long h = 0;
1485 unsigned long g;
1486
1487 while (*p != '\0') {
1488 h = (h << 4) + *p++;
1489 if ((g = h & 0xf0000000) != 0)
1490 h ^= g >> 24;
1491 h &= ~g;
1492 }
1493 return (h);
1494 }
1495
1496 static int
link_elf_lookup_symbol(linker_file_t lf,const char * name,c_linker_sym_t * sym)1497 link_elf_lookup_symbol(linker_file_t lf, const char *name, c_linker_sym_t *sym)
1498 {
1499 elf_file_t ef = (elf_file_t) lf;
1500 unsigned long symnum;
1501 const Elf_Sym* symp;
1502 const char *strp;
1503 unsigned long hash;
1504 int i;
1505
1506 /* If we don't have a hash, bail. */
1507 if (ef->buckets == NULL || ef->nbuckets == 0) {
1508 printf("link_elf_lookup_symbol: missing symbol hash table\n");
1509 return (ENOENT);
1510 }
1511
1512 /* First, search hashed global symbols */
1513 hash = elf_hash(name);
1514 symnum = ef->buckets[hash % ef->nbuckets];
1515
1516 while (symnum != STN_UNDEF) {
1517 if (symnum >= ef->nchains) {
1518 printf("%s: corrupt symbol table\n", __func__);
1519 return (ENOENT);
1520 }
1521
1522 symp = ef->symtab + symnum;
1523 if (symp->st_name == 0) {
1524 printf("%s: corrupt symbol table\n", __func__);
1525 return (ENOENT);
1526 }
1527
1528 strp = ef->strtab + symp->st_name;
1529
1530 if (strcmp(name, strp) == 0) {
1531 if (symp->st_shndx != SHN_UNDEF ||
1532 (symp->st_value != 0 &&
1533 (ELF_ST_TYPE(symp->st_info) == STT_FUNC ||
1534 ELF_ST_TYPE(symp->st_info) == STT_GNU_IFUNC))) {
1535 *sym = (c_linker_sym_t) symp;
1536 return (0);
1537 }
1538 return (ENOENT);
1539 }
1540
1541 symnum = ef->chains[symnum];
1542 }
1543
1544 /* If we have not found it, look at the full table (if loaded) */
1545 if (ef->symtab == ef->ddbsymtab)
1546 return (ENOENT);
1547
1548 /* Exhaustive search */
1549 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) {
1550 strp = ef->ddbstrtab + symp->st_name;
1551 if (strcmp(name, strp) == 0) {
1552 if (symp->st_shndx != SHN_UNDEF ||
1553 (symp->st_value != 0 &&
1554 (ELF_ST_TYPE(symp->st_info) == STT_FUNC ||
1555 ELF_ST_TYPE(symp->st_info) == STT_GNU_IFUNC))) {
1556 *sym = (c_linker_sym_t) symp;
1557 return (0);
1558 }
1559 return (ENOENT);
1560 }
1561 }
1562
1563 return (ENOENT);
1564 }
1565
1566 static int
link_elf_symbol_values(linker_file_t lf,c_linker_sym_t sym,linker_symval_t * symval)1567 link_elf_symbol_values(linker_file_t lf, c_linker_sym_t sym,
1568 linker_symval_t *symval)
1569 {
1570 elf_file_t ef;
1571 const Elf_Sym *es;
1572 caddr_t val;
1573
1574 ef = (elf_file_t)lf;
1575 es = (const Elf_Sym *)sym;
1576 if (es >= ef->symtab && es < (ef->symtab + ef->nchains)) {
1577 symval->name = ef->strtab + es->st_name;
1578 val = (caddr_t)ef->address + es->st_value;
1579 if (ELF_ST_TYPE(es->st_info) == STT_GNU_IFUNC)
1580 val = ((caddr_t (*)(void))val)();
1581 symval->value = val;
1582 symval->size = es->st_size;
1583 return (0);
1584 }
1585 if (ef->symtab == ef->ddbsymtab)
1586 return (ENOENT);
1587 if (es >= ef->ddbsymtab && es < (ef->ddbsymtab + ef->ddbsymcnt)) {
1588 symval->name = ef->ddbstrtab + es->st_name;
1589 val = (caddr_t)ef->address + es->st_value;
1590 if (ELF_ST_TYPE(es->st_info) == STT_GNU_IFUNC)
1591 val = ((caddr_t (*)(void))val)();
1592 symval->value = val;
1593 symval->size = es->st_size;
1594 return (0);
1595 }
1596 return (ENOENT);
1597 }
1598
1599 static int
link_elf_search_symbol(linker_file_t lf,caddr_t value,c_linker_sym_t * sym,long * diffp)1600 link_elf_search_symbol(linker_file_t lf, caddr_t value,
1601 c_linker_sym_t *sym, long *diffp)
1602 {
1603 elf_file_t ef = (elf_file_t) lf;
1604 u_long off = (uintptr_t) (void *) value;
1605 u_long diff = off;
1606 u_long st_value;
1607 const Elf_Sym* es;
1608 const Elf_Sym* best = NULL;
1609 int i;
1610
1611 for (i = 0, es = ef->ddbsymtab; i < ef->ddbsymcnt; i++, es++) {
1612 if (es->st_name == 0)
1613 continue;
1614 st_value = es->st_value + (uintptr_t) (void *) ef->address;
1615 if (off >= st_value) {
1616 if (off - st_value < diff) {
1617 diff = off - st_value;
1618 best = es;
1619 if (diff == 0)
1620 break;
1621 } else if (off - st_value == diff) {
1622 best = es;
1623 }
1624 }
1625 }
1626 if (best == NULL)
1627 *diffp = off;
1628 else
1629 *diffp = diff;
1630 *sym = (c_linker_sym_t) best;
1631
1632 return (0);
1633 }
1634
1635 /*
1636 * Look up a linker set on an ELF system.
1637 */
1638 static int
link_elf_lookup_set(linker_file_t lf,const char * name,void *** startp,void *** stopp,int * countp)1639 link_elf_lookup_set(linker_file_t lf, const char *name,
1640 void ***startp, void ***stopp, int *countp)
1641 {
1642 c_linker_sym_t sym;
1643 linker_symval_t symval;
1644 char *setsym;
1645 void **start, **stop;
1646 int len, error = 0, count;
1647
1648 len = strlen(name) + sizeof("__start_set_"); /* sizeof includes \0 */
1649 setsym = malloc(len, M_LINKER, M_WAITOK);
1650
1651 /* get address of first entry */
1652 snprintf(setsym, len, "%s%s", "__start_set_", name);
1653 error = link_elf_lookup_symbol(lf, setsym, &sym);
1654 if (error != 0)
1655 goto out;
1656 link_elf_symbol_values(lf, sym, &symval);
1657 if (symval.value == 0) {
1658 error = ESRCH;
1659 goto out;
1660 }
1661 start = (void **)symval.value;
1662
1663 /* get address of last entry */
1664 snprintf(setsym, len, "%s%s", "__stop_set_", name);
1665 error = link_elf_lookup_symbol(lf, setsym, &sym);
1666 if (error != 0)
1667 goto out;
1668 link_elf_symbol_values(lf, sym, &symval);
1669 if (symval.value == 0) {
1670 error = ESRCH;
1671 goto out;
1672 }
1673 stop = (void **)symval.value;
1674
1675 /* and the number of entries */
1676 count = stop - start;
1677
1678 /* and copy out */
1679 if (startp != NULL)
1680 *startp = start;
1681 if (stopp != NULL)
1682 *stopp = stop;
1683 if (countp != NULL)
1684 *countp = count;
1685
1686 out:
1687 free(setsym, M_LINKER);
1688 return (error);
1689 }
1690
1691 static int
link_elf_each_function_name(linker_file_t file,int (* callback)(const char *,void *),void * opaque)1692 link_elf_each_function_name(linker_file_t file,
1693 int (*callback)(const char *, void *), void *opaque)
1694 {
1695 elf_file_t ef = (elf_file_t)file;
1696 const Elf_Sym *symp;
1697 int i, error;
1698
1699 /* Exhaustive search */
1700 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) {
1701 if (symp->st_value != 0 &&
1702 (ELF_ST_TYPE(symp->st_info) == STT_FUNC ||
1703 ELF_ST_TYPE(symp->st_info) == STT_GNU_IFUNC)) {
1704 error = callback(ef->ddbstrtab + symp->st_name, opaque);
1705 if (error != 0)
1706 return (error);
1707 }
1708 }
1709 return (0);
1710 }
1711
1712 static int
link_elf_each_function_nameval(linker_file_t file,linker_function_nameval_callback_t callback,void * opaque)1713 link_elf_each_function_nameval(linker_file_t file,
1714 linker_function_nameval_callback_t callback, void *opaque)
1715 {
1716 linker_symval_t symval;
1717 elf_file_t ef = (elf_file_t)file;
1718 const Elf_Sym* symp;
1719 int i, error;
1720
1721 /* Exhaustive search */
1722 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) {
1723 if (symp->st_value != 0 &&
1724 (ELF_ST_TYPE(symp->st_info) == STT_FUNC ||
1725 ELF_ST_TYPE(symp->st_info) == STT_GNU_IFUNC)) {
1726 error = link_elf_symbol_values(file,
1727 (c_linker_sym_t) symp, &symval);
1728 if (error != 0)
1729 return (error);
1730 error = callback(file, i, &symval, opaque);
1731 if (error != 0)
1732 return (error);
1733 }
1734 }
1735 return (0);
1736 }
1737
1738 const Elf_Sym *
elf_get_sym(linker_file_t lf,Elf_Size symidx)1739 elf_get_sym(linker_file_t lf, Elf_Size symidx)
1740 {
1741 elf_file_t ef = (elf_file_t)lf;
1742
1743 if (symidx >= ef->nchains)
1744 return (NULL);
1745 return (ef->symtab + symidx);
1746 }
1747
1748 const char *
elf_get_symname(linker_file_t lf,Elf_Size symidx)1749 elf_get_symname(linker_file_t lf, Elf_Size symidx)
1750 {
1751 elf_file_t ef = (elf_file_t)lf;
1752 const Elf_Sym *sym;
1753
1754 if (symidx >= ef->nchains)
1755 return (NULL);
1756 sym = ef->symtab + symidx;
1757 return (ef->strtab + sym->st_name);
1758 }
1759
1760 /*
1761 * Symbol lookup function that can be used when the symbol index is known (ie
1762 * in relocations). It uses the symbol index instead of doing a fully fledged
1763 * hash table based lookup when such is valid. For example for local symbols.
1764 * This is not only more efficient, it's also more correct. It's not always
1765 * the case that the symbol can be found through the hash table.
1766 */
1767 static int
elf_lookup(linker_file_t lf,Elf_Size symidx,int deps,Elf_Addr * res)1768 elf_lookup(linker_file_t lf, Elf_Size symidx, int deps, Elf_Addr *res)
1769 {
1770 elf_file_t ef = (elf_file_t)lf;
1771 const Elf_Sym *sym;
1772 const char *symbol;
1773 Elf_Addr addr, start, base;
1774
1775 /* Don't even try to lookup the symbol if the index is bogus. */
1776 if (symidx >= ef->nchains) {
1777 *res = 0;
1778 return (EINVAL);
1779 }
1780
1781 sym = ef->symtab + symidx;
1782
1783 /*
1784 * Don't do a full lookup when the symbol is local. It may even
1785 * fail because it may not be found through the hash table.
1786 */
1787 if (ELF_ST_BIND(sym->st_info) == STB_LOCAL) {
1788 /* Force lookup failure when we have an insanity. */
1789 if (sym->st_shndx == SHN_UNDEF || sym->st_value == 0) {
1790 *res = 0;
1791 return (EINVAL);
1792 }
1793 *res = ((Elf_Addr)ef->address + sym->st_value);
1794 return (0);
1795 }
1796
1797 /*
1798 * XXX we can avoid doing a hash table based lookup for global
1799 * symbols as well. This however is not always valid, so we'll
1800 * just do it the hard way for now. Performance tweaks can
1801 * always be added.
1802 */
1803
1804 symbol = ef->strtab + sym->st_name;
1805
1806 /* Force a lookup failure if the symbol name is bogus. */
1807 if (*symbol == 0) {
1808 *res = 0;
1809 return (EINVAL);
1810 }
1811
1812 addr = ((Elf_Addr)linker_file_lookup_symbol(lf, symbol, deps));
1813 if (addr == 0 && ELF_ST_BIND(sym->st_info) != STB_WEAK) {
1814 *res = 0;
1815 return (EINVAL);
1816 }
1817
1818 if (elf_set_find(&set_pcpu_list, addr, &start, &base))
1819 addr = addr - start + base;
1820 #ifdef VIMAGE
1821 else if (elf_set_find(&set_vnet_list, addr, &start, &base))
1822 addr = addr - start + base;
1823 #endif
1824 *res = addr;
1825 return (0);
1826 }
1827
1828 static void
link_elf_reloc_local(linker_file_t lf)1829 link_elf_reloc_local(linker_file_t lf)
1830 {
1831 const Elf_Rel *rellim;
1832 const Elf_Rel *rel;
1833 const Elf_Rela *relalim;
1834 const Elf_Rela *rela;
1835 elf_file_t ef = (elf_file_t)lf;
1836
1837 /* Perform relocations without addend if there are any: */
1838 if ((rel = ef->rel) != NULL) {
1839 rellim = (const Elf_Rel *)((const char *)ef->rel + ef->relsize);
1840 while (rel < rellim) {
1841 elf_reloc_local(lf, (Elf_Addr)ef->address, rel,
1842 ELF_RELOC_REL, elf_lookup);
1843 rel++;
1844 }
1845 }
1846
1847 /* Perform relocations with addend if there are any: */
1848 if ((rela = ef->rela) != NULL) {
1849 relalim = (const Elf_Rela *)
1850 ((const char *)ef->rela + ef->relasize);
1851 while (rela < relalim) {
1852 elf_reloc_local(lf, (Elf_Addr)ef->address, rela,
1853 ELF_RELOC_RELA, elf_lookup);
1854 rela++;
1855 }
1856 }
1857 }
1858
1859 static long
link_elf_symtab_get(linker_file_t lf,const Elf_Sym ** symtab)1860 link_elf_symtab_get(linker_file_t lf, const Elf_Sym **symtab)
1861 {
1862 elf_file_t ef = (elf_file_t)lf;
1863
1864 *symtab = ef->ddbsymtab;
1865
1866 if (*symtab == NULL)
1867 return (0);
1868
1869 return (ef->ddbsymcnt);
1870 }
1871
1872 static long
link_elf_strtab_get(linker_file_t lf,caddr_t * strtab)1873 link_elf_strtab_get(linker_file_t lf, caddr_t *strtab)
1874 {
1875 elf_file_t ef = (elf_file_t)lf;
1876
1877 *strtab = ef->ddbstrtab;
1878
1879 if (*strtab == NULL)
1880 return (0);
1881
1882 return (ef->ddbstrcnt);
1883 }
1884
1885 #if defined(__i386__) || defined(__amd64__) || defined(__aarch64__) || defined(__powerpc__)
1886 /*
1887 * Use this lookup routine when performing relocations early during boot.
1888 * The generic lookup routine depends on kobj, which is not initialized
1889 * at that point.
1890 */
1891 static int
elf_lookup_ifunc(linker_file_t lf,Elf_Size symidx,int deps __unused,Elf_Addr * res)1892 elf_lookup_ifunc(linker_file_t lf, Elf_Size symidx, int deps __unused,
1893 Elf_Addr *res)
1894 {
1895 elf_file_t ef;
1896 const Elf_Sym *symp;
1897 caddr_t val;
1898
1899 ef = (elf_file_t)lf;
1900 symp = ef->symtab + symidx;
1901 if (ELF_ST_TYPE(symp->st_info) == STT_GNU_IFUNC) {
1902 val = (caddr_t)ef->address + symp->st_value;
1903 *res = ((Elf_Addr (*)(void))val)();
1904 return (0);
1905 }
1906 return (ENOENT);
1907 }
1908
1909 void
link_elf_ireloc(caddr_t kmdp)1910 link_elf_ireloc(caddr_t kmdp)
1911 {
1912 struct elf_file eff;
1913 elf_file_t ef;
1914
1915 ef = &eff;
1916
1917 bzero_early(ef, sizeof(*ef));
1918
1919 ef->modptr = kmdp;
1920 ef->dynamic = (Elf_Dyn *)&_DYNAMIC;
1921
1922 #ifdef RELOCATABLE_KERNEL
1923 ef->address = (caddr_t) (__startkernel - KERNBASE);
1924 #else
1925 ef->address = 0;
1926 #endif
1927 parse_dynamic(ef);
1928
1929 link_elf_preload_parse_symbols(ef);
1930 relocate_file1(ef, elf_lookup_ifunc, elf_reloc, true);
1931 }
1932
1933 #if defined(__aarch64__) || defined(__amd64__)
1934 void
link_elf_late_ireloc(void)1935 link_elf_late_ireloc(void)
1936 {
1937 elf_file_t ef;
1938
1939 KASSERT(linker_kernel_file != NULL,
1940 ("link_elf_late_ireloc: No kernel linker file found"));
1941 ef = (elf_file_t)linker_kernel_file;
1942
1943 relocate_file1(ef, elf_lookup_ifunc, elf_reloc_late, true);
1944 }
1945 #endif
1946 #endif
1947