1 /*-
2 * Copyright (c) 1998-2000 Doug Rabson
3 * Copyright (c) 2004 Peter Wemm
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD: releng/9.1/sys/kern/link_elf_obj.c 233353 2012-03-23 11:26:54Z kib $");
30
31 #include "opt_ddb.h"
32
33 #include <sys/param.h>
34 #include <sys/systm.h>
35 #include <sys/kernel.h>
36 #include <sys/lock.h>
37 #include <sys/malloc.h>
38 #include <sys/mutex.h>
39 #include <sys/mount.h>
40 #include <sys/proc.h>
41 #include <sys/namei.h>
42 #include <sys/fcntl.h>
43 #include <sys/vnode.h>
44 #include <sys/linker.h>
45
46 #include <machine/elf.h>
47
48 #include <net/vnet.h>
49
50 #include <security/mac/mac_framework.h>
51
52 #include <vm/vm.h>
53 #include <vm/vm_param.h>
54 #include <vm/vm_object.h>
55 #include <vm/vm_kern.h>
56 #include <vm/vm_extern.h>
57 #include <vm/pmap.h>
58 #include <vm/vm_map.h>
59
60 #include <sys/link_elf.h>
61
62 #ifdef DDB_CTF
63 #include <net/zlib.h>
64 #endif
65
66 #include "linker_if.h"
67
68 typedef struct {
69 void *addr;
70 Elf_Off size;
71 int flags;
72 int sec; /* Original section */
73 char *name;
74 } Elf_progent;
75
76 typedef struct {
77 Elf_Rel *rel;
78 int nrel;
79 int sec;
80 } Elf_relent;
81
82 typedef struct {
83 Elf_Rela *rela;
84 int nrela;
85 int sec;
86 } Elf_relaent;
87
88
89 typedef struct elf_file {
90 struct linker_file lf; /* Common fields */
91
92 int preloaded;
93 caddr_t address; /* Relocation address */
94 vm_object_t object; /* VM object to hold file pages */
95 Elf_Shdr *e_shdr;
96
97 Elf_progent *progtab;
98 int nprogtab;
99
100 Elf_relaent *relatab;
101 int nrelatab;
102
103 Elf_relent *reltab;
104 int nreltab;
105
106 Elf_Sym *ddbsymtab; /* The symbol table we are using */
107 long ddbsymcnt; /* Number of symbols */
108 caddr_t ddbstrtab; /* String table */
109 long ddbstrcnt; /* number of bytes in string table */
110
111 caddr_t shstrtab; /* Section name string table */
112 long shstrcnt; /* number of bytes in string table */
113
114 caddr_t ctftab; /* CTF table */
115 long ctfcnt; /* number of bytes in CTF table */
116 caddr_t ctfoff; /* CTF offset table */
117 caddr_t typoff; /* Type offset table */
118 long typlen; /* Number of type entries. */
119
120 } *elf_file_t;
121
122 #include <kern/kern_ctf.c>
123
124 static int link_elf_link_preload(linker_class_t cls,
125 const char *, linker_file_t *);
126 static int link_elf_link_preload_finish(linker_file_t);
127 static int link_elf_load_file(linker_class_t, const char *, linker_file_t *);
128 static int link_elf_lookup_symbol(linker_file_t, const char *,
129 c_linker_sym_t *);
130 static int link_elf_symbol_values(linker_file_t, c_linker_sym_t,
131 linker_symval_t *);
132 static int link_elf_search_symbol(linker_file_t, caddr_t value,
133 c_linker_sym_t *sym, long *diffp);
134
135 static void link_elf_unload_file(linker_file_t);
136 static int link_elf_lookup_set(linker_file_t, const char *,
137 void ***, void ***, int *);
138 static int link_elf_each_function_name(linker_file_t,
139 int (*)(const char *, void *), void *);
140 static int link_elf_each_function_nameval(linker_file_t,
141 linker_function_nameval_callback_t,
142 void *);
143 static void link_elf_reloc_local(linker_file_t);
144 static long link_elf_symtab_get(linker_file_t, const Elf_Sym **);
145 static long link_elf_strtab_get(linker_file_t, caddr_t *);
146
147 static Elf_Addr elf_obj_lookup(linker_file_t lf, Elf_Size symidx, int deps);
148
149 static kobj_method_t link_elf_methods[] = {
150 KOBJMETHOD(linker_lookup_symbol, link_elf_lookup_symbol),
151 KOBJMETHOD(linker_symbol_values, link_elf_symbol_values),
152 KOBJMETHOD(linker_search_symbol, link_elf_search_symbol),
153 KOBJMETHOD(linker_unload, link_elf_unload_file),
154 KOBJMETHOD(linker_load_file, link_elf_load_file),
155 KOBJMETHOD(linker_link_preload, link_elf_link_preload),
156 KOBJMETHOD(linker_link_preload_finish, link_elf_link_preload_finish),
157 KOBJMETHOD(linker_lookup_set, link_elf_lookup_set),
158 KOBJMETHOD(linker_each_function_name, link_elf_each_function_name),
159 KOBJMETHOD(linker_each_function_nameval, link_elf_each_function_nameval),
160 KOBJMETHOD(linker_ctf_get, link_elf_ctf_get),
161 KOBJMETHOD(linker_symtab_get, link_elf_symtab_get),
162 KOBJMETHOD(linker_strtab_get, link_elf_strtab_get),
163 { 0, 0 }
164 };
165
166 static struct linker_class link_elf_class = {
167 #if ELF_TARG_CLASS == ELFCLASS32
168 "elf32_obj",
169 #else
170 "elf64_obj",
171 #endif
172 link_elf_methods, sizeof(struct elf_file)
173 };
174
175 static int relocate_file(elf_file_t ef);
176
177 static void
178 link_elf_error(const char *filename, const char *s)
179 {
180 if (filename == NULL)
181 printf("kldload: %s\n", s);
182 else
183 printf("kldload: %s: %s\n", filename, s);
184 }
185
186 static void
187 link_elf_init(void *arg)
188 {
189
190 linker_add_class(&link_elf_class);
191 }
192
193 SYSINIT(link_elf_obj, SI_SUB_KLD, SI_ORDER_SECOND, link_elf_init, 0);
194
195 static int
196 link_elf_link_preload(linker_class_t cls, const char *filename,
197 linker_file_t *result)
198 {
199 Elf_Ehdr *hdr;
200 Elf_Shdr *shdr;
201 Elf_Sym *es;
202 void *modptr, *baseptr, *sizeptr;
203 char *type;
204 elf_file_t ef;
205 linker_file_t lf;
206 Elf_Addr off;
207 int error, i, j, pb, ra, rl, shstrindex, symstrindex, symtabindex;
208
209 /* Look to see if we have the file preloaded */
210 modptr = preload_search_by_name(filename);
211 if (modptr == NULL)
212 return ENOENT;
213
214 type = (char *)preload_search_info(modptr, MODINFO_TYPE);
215 baseptr = preload_search_info(modptr, MODINFO_ADDR);
216 sizeptr = preload_search_info(modptr, MODINFO_SIZE);
217 hdr = (Elf_Ehdr *)preload_search_info(modptr, MODINFO_METADATA |
218 MODINFOMD_ELFHDR);
219 shdr = (Elf_Shdr *)preload_search_info(modptr, MODINFO_METADATA |
220 MODINFOMD_SHDR);
221 if (type == NULL || (strcmp(type, "elf" __XSTRING(__ELF_WORD_SIZE)
222 " obj module") != 0 &&
223 strcmp(type, "elf obj module") != 0)) {
224 return (EFTYPE);
225 }
226 if (baseptr == NULL || sizeptr == NULL || hdr == NULL ||
227 shdr == NULL)
228 return (EINVAL);
229
230 lf = linker_make_file(filename, &link_elf_class);
231 if (lf == NULL)
232 return (ENOMEM);
233
234 ef = (elf_file_t)lf;
235 ef->preloaded = 1;
236 ef->address = *(caddr_t *)baseptr;
237 lf->address = *(caddr_t *)baseptr;
238 lf->size = *(size_t *)sizeptr;
239
240 if (hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS ||
241 hdr->e_ident[EI_DATA] != ELF_TARG_DATA ||
242 hdr->e_ident[EI_VERSION] != EV_CURRENT ||
243 hdr->e_version != EV_CURRENT ||
244 hdr->e_type != ET_REL ||
245 hdr->e_machine != ELF_TARG_MACH) {
246 error = EFTYPE;
247 goto out;
248 }
249 ef->e_shdr = shdr;
250
251 /* Scan the section header for information and table sizing. */
252 symtabindex = -1;
253 symstrindex = -1;
254 for (i = 0; i < hdr->e_shnum; i++) {
255 switch (shdr[i].sh_type) {
256 case SHT_PROGBITS:
257 case SHT_NOBITS:
258 ef->nprogtab++;
259 break;
260 case SHT_SYMTAB:
261 symtabindex = i;
262 symstrindex = shdr[i].sh_link;
263 break;
264 case SHT_REL:
265 ef->nreltab++;
266 break;
267 case SHT_RELA:
268 ef->nrelatab++;
269 break;
270 }
271 }
272
273 shstrindex = hdr->e_shstrndx;
274 if (ef->nprogtab == 0 || symstrindex < 0 ||
275 symstrindex >= hdr->e_shnum ||
276 shdr[symstrindex].sh_type != SHT_STRTAB || shstrindex == 0 ||
277 shstrindex >= hdr->e_shnum ||
278 shdr[shstrindex].sh_type != SHT_STRTAB) {
279 printf("%s: bad/missing section headers\n", filename);
280 error = ENOEXEC;
281 goto out;
282 }
283
284 /* Allocate space for tracking the load chunks */
285 if (ef->nprogtab != 0)
286 ef->progtab = malloc(ef->nprogtab * sizeof(*ef->progtab),
287 M_LINKER, M_WAITOK | M_ZERO);
288 if (ef->nreltab != 0)
289 ef->reltab = malloc(ef->nreltab * sizeof(*ef->reltab),
290 M_LINKER, M_WAITOK | M_ZERO);
291 if (ef->nrelatab != 0)
292 ef->relatab = malloc(ef->nrelatab * sizeof(*ef->relatab),
293 M_LINKER, M_WAITOK | M_ZERO);
294 if ((ef->nprogtab != 0 && ef->progtab == NULL) ||
295 (ef->nreltab != 0 && ef->reltab == NULL) ||
296 (ef->nrelatab != 0 && ef->relatab == NULL)) {
297 error = ENOMEM;
298 goto out;
299 }
300
301 /* XXX, relocate the sh_addr fields saved by the loader. */
302 off = 0;
303 for (i = 0; i < hdr->e_shnum; i++) {
304 if (shdr[i].sh_addr != 0 && (off == 0 || shdr[i].sh_addr < off))
305 off = shdr[i].sh_addr;
306 }
307 for (i = 0; i < hdr->e_shnum; i++) {
308 if (shdr[i].sh_addr != 0)
309 shdr[i].sh_addr = shdr[i].sh_addr - off +
310 (Elf_Addr)ef->address;
311 }
312
313 ef->ddbsymcnt = shdr[symtabindex].sh_size / sizeof(Elf_Sym);
314 ef->ddbsymtab = (Elf_Sym *)shdr[symtabindex].sh_addr;
315 ef->ddbstrcnt = shdr[symstrindex].sh_size;
316 ef->ddbstrtab = (char *)shdr[symstrindex].sh_addr;
317 ef->shstrcnt = shdr[shstrindex].sh_size;
318 ef->shstrtab = (char *)shdr[shstrindex].sh_addr;
319
320 /* Now fill out progtab and the relocation tables. */
321 pb = 0;
322 rl = 0;
323 ra = 0;
324 for (i = 0; i < hdr->e_shnum; i++) {
325 switch (shdr[i].sh_type) {
326 case SHT_PROGBITS:
327 case SHT_NOBITS:
328 ef->progtab[pb].addr = (void *)shdr[i].sh_addr;
329 if (shdr[i].sh_type == SHT_PROGBITS)
330 ef->progtab[pb].name = "<<PROGBITS>>";
331 else
332 ef->progtab[pb].name = "<<NOBITS>>";
333 ef->progtab[pb].size = shdr[i].sh_size;
334 ef->progtab[pb].sec = i;
335 if (ef->shstrtab && shdr[i].sh_name != 0)
336 ef->progtab[pb].name =
337 ef->shstrtab + shdr[i].sh_name;
338 if (ef->progtab[pb].name != NULL &&
339 !strcmp(ef->progtab[pb].name, DPCPU_SETNAME)) {
340 void *dpcpu;
341
342 dpcpu = dpcpu_alloc(shdr[i].sh_size);
343 if (dpcpu == NULL) {
344 error = ENOSPC;
345 goto out;
346 }
347 memcpy(dpcpu, ef->progtab[pb].addr,
348 ef->progtab[pb].size);
349 dpcpu_copy(dpcpu, shdr[i].sh_size);
350 ef->progtab[pb].addr = dpcpu;
351 #ifdef VIMAGE
352 } else if (ef->progtab[pb].name != NULL &&
353 !strcmp(ef->progtab[pb].name, VNET_SETNAME)) {
354 void *vnet_data;
355
356 vnet_data = vnet_data_alloc(shdr[i].sh_size);
357 if (vnet_data == NULL) {
358 error = ENOSPC;
359 goto out;
360 }
361 memcpy(vnet_data, ef->progtab[pb].addr,
362 ef->progtab[pb].size);
363 vnet_data_copy(vnet_data, shdr[i].sh_size);
364 ef->progtab[pb].addr = vnet_data;
365 #endif
366 }
367
368 /* Update all symbol values with the offset. */
369 for (j = 0; j < ef->ddbsymcnt; j++) {
370 es = &ef->ddbsymtab[j];
371 if (es->st_shndx != i)
372 continue;
373 es->st_value += (Elf_Addr)ef->progtab[pb].addr;
374 }
375 pb++;
376 break;
377 case SHT_REL:
378 ef->reltab[rl].rel = (Elf_Rel *)shdr[i].sh_addr;
379 ef->reltab[rl].nrel = shdr[i].sh_size / sizeof(Elf_Rel);
380 ef->reltab[rl].sec = shdr[i].sh_info;
381 rl++;
382 break;
383 case SHT_RELA:
384 ef->relatab[ra].rela = (Elf_Rela *)shdr[i].sh_addr;
385 ef->relatab[ra].nrela =
386 shdr[i].sh_size / sizeof(Elf_Rela);
387 ef->relatab[ra].sec = shdr[i].sh_info;
388 ra++;
389 break;
390 }
391 }
392 if (pb != ef->nprogtab)
393 panic("lost progbits");
394 if (rl != ef->nreltab)
395 panic("lost reltab");
396 if (ra != ef->nrelatab)
397 panic("lost relatab");
398
399 /* Local intra-module relocations */
400 link_elf_reloc_local(lf);
401
402 *result = lf;
403 return (0);
404
405 out:
406 /* preload not done this way */
407 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
408 return (error);
409 }
410
411 static int
412 link_elf_link_preload_finish(linker_file_t lf)
413 {
414 elf_file_t ef;
415 int error;
416
417 ef = (elf_file_t)lf;
418 error = relocate_file(ef);
419 if (error)
420 return error;
421
422 /* Notify MD code that a module is being loaded. */
423 error = elf_cpu_load_file(lf);
424 if (error)
425 return (error);
426
427 return (0);
428 }
429
430 static int
431 link_elf_load_file(linker_class_t cls, const char *filename,
432 linker_file_t *result)
433 {
434 struct nameidata nd;
435 struct thread *td = curthread; /* XXX */
436 Elf_Ehdr *hdr;
437 Elf_Shdr *shdr;
438 Elf_Sym *es;
439 int nbytes, i, j;
440 vm_offset_t mapbase;
441 size_t mapsize;
442 int error = 0;
443 ssize_t resid;
444 int flags;
445 elf_file_t ef;
446 linker_file_t lf;
447 int symtabindex;
448 int symstrindex;
449 int shstrindex;
450 int nsym;
451 int pb, rl, ra;
452 int alignmask;
453 int vfslocked;
454
455 shdr = NULL;
456 lf = NULL;
457 mapsize = 0;
458 hdr = NULL;
459
460 NDINIT(&nd, LOOKUP, FOLLOW | MPSAFE, UIO_SYSSPACE, filename, td);
461 flags = FREAD;
462 error = vn_open(&nd, &flags, 0, NULL);
463 if (error)
464 return error;
465 vfslocked = NDHASGIANT(&nd);
466 NDFREE(&nd, NDF_ONLY_PNBUF);
467 if (nd.ni_vp->v_type != VREG) {
468 error = ENOEXEC;
469 goto out;
470 }
471 #ifdef MAC
472 error = mac_kld_check_load(td->td_ucred, nd.ni_vp);
473 if (error) {
474 goto out;
475 }
476 #endif
477
478 /* Read the elf header from the file. */
479 hdr = malloc(sizeof(*hdr), M_LINKER, M_WAITOK);
480 error = vn_rdwr(UIO_READ, nd.ni_vp, (void *)hdr, sizeof(*hdr), 0,
481 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
482 &resid, td);
483 if (error)
484 goto out;
485 if (resid != 0){
486 error = ENOEXEC;
487 goto out;
488 }
489
490 if (!IS_ELF(*hdr)) {
491 error = ENOEXEC;
492 goto out;
493 }
494
495 if (hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS
496 || hdr->e_ident[EI_DATA] != ELF_TARG_DATA) {
497 link_elf_error(filename, "Unsupported file layout");
498 error = ENOEXEC;
499 goto out;
500 }
501 if (hdr->e_ident[EI_VERSION] != EV_CURRENT
502 || hdr->e_version != EV_CURRENT) {
503 link_elf_error(filename, "Unsupported file version");
504 error = ENOEXEC;
505 goto out;
506 }
507 if (hdr->e_type != ET_REL) {
508 error = ENOSYS;
509 goto out;
510 }
511 if (hdr->e_machine != ELF_TARG_MACH) {
512 link_elf_error(filename, "Unsupported machine");
513 error = ENOEXEC;
514 goto out;
515 }
516
517 lf = linker_make_file(filename, &link_elf_class);
518 if (!lf) {
519 error = ENOMEM;
520 goto out;
521 }
522 ef = (elf_file_t) lf;
523 ef->nprogtab = 0;
524 ef->e_shdr = 0;
525 ef->nreltab = 0;
526 ef->nrelatab = 0;
527
528 /* Allocate and read in the section header */
529 nbytes = hdr->e_shnum * hdr->e_shentsize;
530 if (nbytes == 0 || hdr->e_shoff == 0 ||
531 hdr->e_shentsize != sizeof(Elf_Shdr)) {
532 error = ENOEXEC;
533 goto out;
534 }
535 shdr = malloc(nbytes, M_LINKER, M_WAITOK);
536 ef->e_shdr = shdr;
537 error = vn_rdwr(UIO_READ, nd.ni_vp, (caddr_t)shdr, nbytes, hdr->e_shoff,
538 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, &resid, td);
539 if (error)
540 goto out;
541 if (resid) {
542 error = ENOEXEC;
543 goto out;
544 }
545
546 /* Scan the section header for information and table sizing. */
547 nsym = 0;
548 symtabindex = -1;
549 symstrindex = -1;
550 for (i = 0; i < hdr->e_shnum; i++) {
551 if (shdr[i].sh_size == 0)
552 continue;
553 switch (shdr[i].sh_type) {
554 case SHT_PROGBITS:
555 case SHT_NOBITS:
556 ef->nprogtab++;
557 break;
558 case SHT_SYMTAB:
559 nsym++;
560 symtabindex = i;
561 symstrindex = shdr[i].sh_link;
562 break;
563 case SHT_REL:
564 ef->nreltab++;
565 break;
566 case SHT_RELA:
567 ef->nrelatab++;
568 break;
569 case SHT_STRTAB:
570 break;
571 }
572 }
573 if (ef->nprogtab == 0) {
574 link_elf_error(filename, "file has no contents");
575 error = ENOEXEC;
576 goto out;
577 }
578 if (nsym != 1) {
579 /* Only allow one symbol table for now */
580 link_elf_error(filename, "file has no valid symbol table");
581 error = ENOEXEC;
582 goto out;
583 }
584 if (symstrindex < 0 || symstrindex > hdr->e_shnum ||
585 shdr[symstrindex].sh_type != SHT_STRTAB) {
586 link_elf_error(filename, "file has invalid symbol strings");
587 error = ENOEXEC;
588 goto out;
589 }
590
591 /* Allocate space for tracking the load chunks */
592 if (ef->nprogtab != 0)
593 ef->progtab = malloc(ef->nprogtab * sizeof(*ef->progtab),
594 M_LINKER, M_WAITOK | M_ZERO);
595 if (ef->nreltab != 0)
596 ef->reltab = malloc(ef->nreltab * sizeof(*ef->reltab),
597 M_LINKER, M_WAITOK | M_ZERO);
598 if (ef->nrelatab != 0)
599 ef->relatab = malloc(ef->nrelatab * sizeof(*ef->relatab),
600 M_LINKER, M_WAITOK | M_ZERO);
601
602 if (symtabindex == -1)
603 panic("lost symbol table index");
604 /* Allocate space for and load the symbol table */
605 ef->ddbsymcnt = shdr[symtabindex].sh_size / sizeof(Elf_Sym);
606 ef->ddbsymtab = malloc(shdr[symtabindex].sh_size, M_LINKER, M_WAITOK);
607 error = vn_rdwr(UIO_READ, nd.ni_vp, (void *)ef->ddbsymtab,
608 shdr[symtabindex].sh_size, shdr[symtabindex].sh_offset,
609 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
610 &resid, td);
611 if (error)
612 goto out;
613 if (resid != 0){
614 error = EINVAL;
615 goto out;
616 }
617
618 if (symstrindex == -1)
619 panic("lost symbol string index");
620 /* Allocate space for and load the symbol strings */
621 ef->ddbstrcnt = shdr[symstrindex].sh_size;
622 ef->ddbstrtab = malloc(shdr[symstrindex].sh_size, M_LINKER, M_WAITOK);
623 error = vn_rdwr(UIO_READ, nd.ni_vp, ef->ddbstrtab,
624 shdr[symstrindex].sh_size, shdr[symstrindex].sh_offset,
625 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
626 &resid, td);
627 if (error)
628 goto out;
629 if (resid != 0){
630 error = EINVAL;
631 goto out;
632 }
633
634 /* Do we have a string table for the section names? */
635 shstrindex = -1;
636 if (hdr->e_shstrndx != 0 &&
637 shdr[hdr->e_shstrndx].sh_type == SHT_STRTAB) {
638 shstrindex = hdr->e_shstrndx;
639 ef->shstrcnt = shdr[shstrindex].sh_size;
640 ef->shstrtab = malloc(shdr[shstrindex].sh_size, M_LINKER,
641 M_WAITOK);
642 error = vn_rdwr(UIO_READ, nd.ni_vp, ef->shstrtab,
643 shdr[shstrindex].sh_size, shdr[shstrindex].sh_offset,
644 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
645 &resid, td);
646 if (error)
647 goto out;
648 if (resid != 0){
649 error = EINVAL;
650 goto out;
651 }
652 }
653
654 /* Size up code/data(progbits) and bss(nobits). */
655 alignmask = 0;
656 for (i = 0; i < hdr->e_shnum; i++) {
657 if (shdr[i].sh_size == 0)
658 continue;
659 switch (shdr[i].sh_type) {
660 case SHT_PROGBITS:
661 case SHT_NOBITS:
662 alignmask = shdr[i].sh_addralign - 1;
663 mapsize += alignmask;
664 mapsize &= ~alignmask;
665 mapsize += shdr[i].sh_size;
666 break;
667 }
668 }
669
670 /*
671 * We know how much space we need for the text/data/bss/etc.
672 * This stuff needs to be in a single chunk so that profiling etc
673 * can get the bounds and gdb can associate offsets with modules
674 */
675 ef->object = vm_object_allocate(OBJT_DEFAULT,
676 round_page(mapsize) >> PAGE_SHIFT);
677 if (ef->object == NULL) {
678 error = ENOMEM;
679 goto out;
680 }
681 ef->address = (caddr_t) vm_map_min(kernel_map);
682
683 /*
684 * In order to satisfy amd64's architectural requirements on the
685 * location of code and data in the kernel's address space, request a
686 * mapping that is above the kernel.
687 */
688 mapbase = KERNBASE;
689 error = vm_map_find(kernel_map, ef->object, 0, &mapbase,
690 round_page(mapsize), TRUE, VM_PROT_ALL, VM_PROT_ALL, FALSE);
691 if (error) {
692 vm_object_deallocate(ef->object);
693 ef->object = 0;
694 goto out;
695 }
696
697 /* Wire the pages */
698 error = vm_map_wire(kernel_map, mapbase,
699 mapbase + round_page(mapsize),
700 VM_MAP_WIRE_SYSTEM|VM_MAP_WIRE_NOHOLES);
701 if (error != KERN_SUCCESS) {
702 error = ENOMEM;
703 goto out;
704 }
705
706 /* Inform the kld system about the situation */
707 lf->address = ef->address = (caddr_t)mapbase;
708 lf->size = mapsize;
709
710 /*
711 * Now load code/data(progbits), zero bss(nobits), allocate space for
712 * and load relocs
713 */
714 pb = 0;
715 rl = 0;
716 ra = 0;
717 alignmask = 0;
718 for (i = 0; i < hdr->e_shnum; i++) {
719 if (shdr[i].sh_size == 0)
720 continue;
721 switch (shdr[i].sh_type) {
722 case SHT_PROGBITS:
723 case SHT_NOBITS:
724 alignmask = shdr[i].sh_addralign - 1;
725 mapbase += alignmask;
726 mapbase &= ~alignmask;
727 if (ef->shstrtab && shdr[i].sh_name != 0)
728 ef->progtab[pb].name =
729 ef->shstrtab + shdr[i].sh_name;
730 else if (shdr[i].sh_type == SHT_PROGBITS)
731 ef->progtab[pb].name = "<<PROGBITS>>";
732 else
733 ef->progtab[pb].name = "<<NOBITS>>";
734 if (ef->progtab[pb].name != NULL &&
735 !strcmp(ef->progtab[pb].name, DPCPU_SETNAME))
736 ef->progtab[pb].addr =
737 dpcpu_alloc(shdr[i].sh_size);
738 #ifdef VIMAGE
739 else if (ef->progtab[pb].name != NULL &&
740 !strcmp(ef->progtab[pb].name, VNET_SETNAME))
741 ef->progtab[pb].addr =
742 vnet_data_alloc(shdr[i].sh_size);
743 #endif
744 else
745 ef->progtab[pb].addr =
746 (void *)(uintptr_t)mapbase;
747 if (ef->progtab[pb].addr == NULL) {
748 error = ENOSPC;
749 goto out;
750 }
751 ef->progtab[pb].size = shdr[i].sh_size;
752 ef->progtab[pb].sec = i;
753 if (shdr[i].sh_type == SHT_PROGBITS) {
754 error = vn_rdwr(UIO_READ, nd.ni_vp,
755 ef->progtab[pb].addr,
756 shdr[i].sh_size, shdr[i].sh_offset,
757 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred,
758 NOCRED, &resid, td);
759 if (error)
760 goto out;
761 if (resid != 0){
762 error = EINVAL;
763 goto out;
764 }
765 /* Initialize the per-cpu or vnet area. */
766 if (ef->progtab[pb].addr != (void *)mapbase &&
767 !strcmp(ef->progtab[pb].name, DPCPU_SETNAME))
768 dpcpu_copy(ef->progtab[pb].addr,
769 shdr[i].sh_size);
770 #ifdef VIMAGE
771 else if (ef->progtab[pb].addr !=
772 (void *)mapbase &&
773 !strcmp(ef->progtab[pb].name, VNET_SETNAME))
774 vnet_data_copy(ef->progtab[pb].addr,
775 shdr[i].sh_size);
776 #endif
777 } else
778 bzero(ef->progtab[pb].addr, shdr[i].sh_size);
779
780 /* Update all symbol values with the offset. */
781 for (j = 0; j < ef->ddbsymcnt; j++) {
782 es = &ef->ddbsymtab[j];
783 if (es->st_shndx != i)
784 continue;
785 es->st_value += (Elf_Addr)ef->progtab[pb].addr;
786 }
787 mapbase += shdr[i].sh_size;
788 pb++;
789 break;
790 case SHT_REL:
791 ef->reltab[rl].rel = malloc(shdr[i].sh_size, M_LINKER,
792 M_WAITOK);
793 ef->reltab[rl].nrel = shdr[i].sh_size / sizeof(Elf_Rel);
794 ef->reltab[rl].sec = shdr[i].sh_info;
795 error = vn_rdwr(UIO_READ, nd.ni_vp,
796 (void *)ef->reltab[rl].rel,
797 shdr[i].sh_size, shdr[i].sh_offset,
798 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
799 &resid, td);
800 if (error)
801 goto out;
802 if (resid != 0){
803 error = EINVAL;
804 goto out;
805 }
806 rl++;
807 break;
808 case SHT_RELA:
809 ef->relatab[ra].rela = malloc(shdr[i].sh_size, M_LINKER,
810 M_WAITOK);
811 ef->relatab[ra].nrela =
812 shdr[i].sh_size / sizeof(Elf_Rela);
813 ef->relatab[ra].sec = shdr[i].sh_info;
814 error = vn_rdwr(UIO_READ, nd.ni_vp,
815 (void *)ef->relatab[ra].rela,
816 shdr[i].sh_size, shdr[i].sh_offset,
817 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
818 &resid, td);
819 if (error)
820 goto out;
821 if (resid != 0){
822 error = EINVAL;
823 goto out;
824 }
825 ra++;
826 break;
827 }
828 }
829 if (pb != ef->nprogtab)
830 panic("lost progbits");
831 if (rl != ef->nreltab)
832 panic("lost reltab");
833 if (ra != ef->nrelatab)
834 panic("lost relatab");
835 if (mapbase != (vm_offset_t)ef->address + mapsize)
836 panic("mapbase 0x%lx != address %p + mapsize 0x%lx (0x%lx)\n",
837 (u_long)mapbase, ef->address, (u_long)mapsize,
838 (u_long)(vm_offset_t)ef->address + mapsize);
839
840 /* Local intra-module relocations */
841 link_elf_reloc_local(lf);
842
843 /* Pull in dependencies */
844 VOP_UNLOCK(nd.ni_vp, 0);
845 error = linker_load_dependencies(lf);
846 vn_lock(nd.ni_vp, LK_EXCLUSIVE | LK_RETRY);
847 if (error)
848 goto out;
849
850 /* External relocations */
851 error = relocate_file(ef);
852 if (error)
853 goto out;
854
855 /* Notify MD code that a module is being loaded. */
856 error = elf_cpu_load_file(lf);
857 if (error)
858 goto out;
859
860 *result = lf;
861
862 out:
863 VOP_UNLOCK(nd.ni_vp, 0);
864 vn_close(nd.ni_vp, FREAD, td->td_ucred, td);
865 VFS_UNLOCK_GIANT(vfslocked);
866 if (error && lf)
867 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
868 if (hdr)
869 free(hdr, M_LINKER);
870
871 return error;
872 }
873
874 static void
875 link_elf_unload_file(linker_file_t file)
876 {
877 elf_file_t ef = (elf_file_t) file;
878 int i;
879
880 /* Notify MD code that a module is being unloaded. */
881 elf_cpu_unload_file(file);
882
883 if (ef->progtab) {
884 for (i = 0; i < ef->nprogtab; i++) {
885 if (ef->progtab[i].size == 0)
886 continue;
887 if (ef->progtab[i].name == NULL)
888 continue;
889 if (!strcmp(ef->progtab[i].name, DPCPU_SETNAME))
890 dpcpu_free(ef->progtab[i].addr,
891 ef->progtab[i].size);
892 #ifdef VIMAGE
893 else if (!strcmp(ef->progtab[i].name, VNET_SETNAME))
894 vnet_data_free(ef->progtab[i].addr,
895 ef->progtab[i].size);
896 #endif
897 }
898 }
899 if (ef->preloaded) {
900 if (ef->reltab)
901 free(ef->reltab, M_LINKER);
902 if (ef->relatab)
903 free(ef->relatab, M_LINKER);
904 if (ef->progtab)
905 free(ef->progtab, M_LINKER);
906 if (ef->ctftab)
907 free(ef->ctftab, M_LINKER);
908 if (ef->ctfoff)
909 free(ef->ctfoff, M_LINKER);
910 if (ef->typoff)
911 free(ef->typoff, M_LINKER);
912 if (file->filename != NULL)
913 preload_delete_name(file->filename);
914 /* XXX reclaim module memory? */
915 return;
916 }
917
918 for (i = 0; i < ef->nreltab; i++)
919 if (ef->reltab[i].rel)
920 free(ef->reltab[i].rel, M_LINKER);
921 for (i = 0; i < ef->nrelatab; i++)
922 if (ef->relatab[i].rela)
923 free(ef->relatab[i].rela, M_LINKER);
924 if (ef->reltab)
925 free(ef->reltab, M_LINKER);
926 if (ef->relatab)
927 free(ef->relatab, M_LINKER);
928 if (ef->progtab)
929 free(ef->progtab, M_LINKER);
930
931 if (ef->object) {
932 vm_map_remove(kernel_map, (vm_offset_t) ef->address,
933 (vm_offset_t) ef->address +
934 (ef->object->size << PAGE_SHIFT));
935 }
936 if (ef->e_shdr)
937 free(ef->e_shdr, M_LINKER);
938 if (ef->ddbsymtab)
939 free(ef->ddbsymtab, M_LINKER);
940 if (ef->ddbstrtab)
941 free(ef->ddbstrtab, M_LINKER);
942 if (ef->shstrtab)
943 free(ef->shstrtab, M_LINKER);
944 if (ef->ctftab)
945 free(ef->ctftab, M_LINKER);
946 if (ef->ctfoff)
947 free(ef->ctfoff, M_LINKER);
948 if (ef->typoff)
949 free(ef->typoff, M_LINKER);
950 }
951
952 static const char *
953 symbol_name(elf_file_t ef, Elf_Size r_info)
954 {
955 const Elf_Sym *ref;
956
957 if (ELF_R_SYM(r_info)) {
958 ref = ef->ddbsymtab + ELF_R_SYM(r_info);
959 return ef->ddbstrtab + ref->st_name;
960 } else
961 return NULL;
962 }
963
964 static Elf_Addr
965 findbase(elf_file_t ef, int sec)
966 {
967 int i;
968 Elf_Addr base = 0;
969
970 for (i = 0; i < ef->nprogtab; i++) {
971 if (sec == ef->progtab[i].sec) {
972 base = (Elf_Addr)ef->progtab[i].addr;
973 break;
974 }
975 }
976 return base;
977 }
978
979 static int
980 relocate_file(elf_file_t ef)
981 {
982 const Elf_Rel *rellim;
983 const Elf_Rel *rel;
984 const Elf_Rela *relalim;
985 const Elf_Rela *rela;
986 const char *symname;
987 const Elf_Sym *sym;
988 int i;
989 Elf_Size symidx;
990 Elf_Addr base;
991
992
993 /* Perform relocations without addend if there are any: */
994 for (i = 0; i < ef->nreltab; i++) {
995 rel = ef->reltab[i].rel;
996 if (rel == NULL)
997 panic("lost a reltab!");
998 rellim = rel + ef->reltab[i].nrel;
999 base = findbase(ef, ef->reltab[i].sec);
1000 if (base == 0)
1001 panic("lost base for reltab");
1002 for ( ; rel < rellim; rel++) {
1003 symidx = ELF_R_SYM(rel->r_info);
1004 if (symidx >= ef->ddbsymcnt)
1005 continue;
1006 sym = ef->ddbsymtab + symidx;
1007 /* Local relocs are already done */
1008 if (ELF_ST_BIND(sym->st_info) == STB_LOCAL)
1009 continue;
1010 if (elf_reloc(&ef->lf, base, rel, ELF_RELOC_REL,
1011 elf_obj_lookup)) {
1012 symname = symbol_name(ef, rel->r_info);
1013 printf("link_elf_obj: symbol %s undefined\n",
1014 symname);
1015 return ENOENT;
1016 }
1017 }
1018 }
1019
1020 /* Perform relocations with addend if there are any: */
1021 for (i = 0; i < ef->nrelatab; i++) {
1022 rela = ef->relatab[i].rela;
1023 if (rela == NULL)
1024 panic("lost a relatab!");
1025 relalim = rela + ef->relatab[i].nrela;
1026 base = findbase(ef, ef->relatab[i].sec);
1027 if (base == 0)
1028 panic("lost base for relatab");
1029 for ( ; rela < relalim; rela++) {
1030 symidx = ELF_R_SYM(rela->r_info);
1031 if (symidx >= ef->ddbsymcnt)
1032 continue;
1033 sym = ef->ddbsymtab + symidx;
1034 /* Local relocs are already done */
1035 if (ELF_ST_BIND(sym->st_info) == STB_LOCAL)
1036 continue;
1037 if (elf_reloc(&ef->lf, base, rela, ELF_RELOC_RELA,
1038 elf_obj_lookup)) {
1039 symname = symbol_name(ef, rela->r_info);
1040 printf("link_elf_obj: symbol %s undefined\n",
1041 symname);
1042 return ENOENT;
1043 }
1044 }
1045 }
1046
1047 return 0;
1048 }
1049
1050 static int
1051 link_elf_lookup_symbol(linker_file_t lf, const char *name, c_linker_sym_t *sym)
1052 {
1053 elf_file_t ef = (elf_file_t) lf;
1054 const Elf_Sym *symp;
1055 const char *strp;
1056 int i;
1057
1058 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) {
1059 strp = ef->ddbstrtab + symp->st_name;
1060 if (symp->st_shndx != SHN_UNDEF && strcmp(name, strp) == 0) {
1061 *sym = (c_linker_sym_t) symp;
1062 return 0;
1063 }
1064 }
1065 return ENOENT;
1066 }
1067
1068 static int
1069 link_elf_symbol_values(linker_file_t lf, c_linker_sym_t sym,
1070 linker_symval_t *symval)
1071 {
1072 elf_file_t ef = (elf_file_t) lf;
1073 const Elf_Sym *es = (const Elf_Sym*) sym;
1074
1075 if (es >= ef->ddbsymtab && es < (ef->ddbsymtab + ef->ddbsymcnt)) {
1076 symval->name = ef->ddbstrtab + es->st_name;
1077 symval->value = (caddr_t)es->st_value;
1078 symval->size = es->st_size;
1079 return 0;
1080 }
1081 return ENOENT;
1082 }
1083
1084 static int
1085 link_elf_search_symbol(linker_file_t lf, caddr_t value,
1086 c_linker_sym_t *sym, long *diffp)
1087 {
1088 elf_file_t ef = (elf_file_t) lf;
1089 u_long off = (uintptr_t) (void *) value;
1090 u_long diff = off;
1091 u_long st_value;
1092 const Elf_Sym *es;
1093 const Elf_Sym *best = 0;
1094 int i;
1095
1096 for (i = 0, es = ef->ddbsymtab; i < ef->ddbsymcnt; i++, es++) {
1097 if (es->st_name == 0)
1098 continue;
1099 st_value = es->st_value;
1100 if (off >= st_value) {
1101 if (off - st_value < diff) {
1102 diff = off - st_value;
1103 best = es;
1104 if (diff == 0)
1105 break;
1106 } else if (off - st_value == diff) {
1107 best = es;
1108 }
1109 }
1110 }
1111 if (best == 0)
1112 *diffp = off;
1113 else
1114 *diffp = diff;
1115 *sym = (c_linker_sym_t) best;
1116
1117 return 0;
1118 }
1119
1120 /*
1121 * Look up a linker set on an ELF system.
1122 */
1123 static int
1124 link_elf_lookup_set(linker_file_t lf, const char *name,
1125 void ***startp, void ***stopp, int *countp)
1126 {
1127 elf_file_t ef = (elf_file_t)lf;
1128 void **start, **stop;
1129 int i, count;
1130
1131 /* Relative to section number */
1132 for (i = 0; i < ef->nprogtab; i++) {
1133 if ((strncmp(ef->progtab[i].name, "set_", 4) == 0) &&
1134 strcmp(ef->progtab[i].name + 4, name) == 0) {
1135 start = (void **)ef->progtab[i].addr;
1136 stop = (void **)((char *)ef->progtab[i].addr +
1137 ef->progtab[i].size);
1138 count = stop - start;
1139 if (startp)
1140 *startp = start;
1141 if (stopp)
1142 *stopp = stop;
1143 if (countp)
1144 *countp = count;
1145 return (0);
1146 }
1147 }
1148 return (ESRCH);
1149 }
1150
1151 static int
1152 link_elf_each_function_name(linker_file_t file,
1153 int (*callback)(const char *, void *), void *opaque)
1154 {
1155 elf_file_t ef = (elf_file_t)file;
1156 const Elf_Sym *symp;
1157 int i, error;
1158
1159 /* Exhaustive search */
1160 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) {
1161 if (symp->st_value != 0 &&
1162 ELF_ST_TYPE(symp->st_info) == STT_FUNC) {
1163 error = callback(ef->ddbstrtab + symp->st_name, opaque);
1164 if (error)
1165 return (error);
1166 }
1167 }
1168 return (0);
1169 }
1170
1171 static int
1172 link_elf_each_function_nameval(linker_file_t file,
1173 linker_function_nameval_callback_t callback, void *opaque)
1174 {
1175 linker_symval_t symval;
1176 elf_file_t ef = (elf_file_t)file;
1177 const Elf_Sym* symp;
1178 int i, error;
1179
1180 /* Exhaustive search */
1181 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) {
1182 if (symp->st_value != 0 &&
1183 ELF_ST_TYPE(symp->st_info) == STT_FUNC) {
1184 error = link_elf_symbol_values(file, (c_linker_sym_t) symp, &symval);
1185 if (error)
1186 return (error);
1187 error = callback(file, i, &symval, opaque);
1188 if (error)
1189 return (error);
1190 }
1191 }
1192 return (0);
1193 }
1194
1195 /*
1196 * Symbol lookup function that can be used when the symbol index is known (ie
1197 * in relocations). It uses the symbol index instead of doing a fully fledged
1198 * hash table based lookup when such is valid. For example for local symbols.
1199 * This is not only more efficient, it's also more correct. It's not always
1200 * the case that the symbol can be found through the hash table.
1201 */
1202 static Elf_Addr
1203 elf_obj_lookup(linker_file_t lf, Elf_Size symidx, int deps)
1204 {
1205 elf_file_t ef = (elf_file_t)lf;
1206 const Elf_Sym *sym;
1207 const char *symbol;
1208 Elf_Addr ret;
1209
1210 /* Don't even try to lookup the symbol if the index is bogus. */
1211 if (symidx >= ef->ddbsymcnt)
1212 return (0);
1213
1214 sym = ef->ddbsymtab + symidx;
1215
1216 /* Quick answer if there is a definition included. */
1217 if (sym->st_shndx != SHN_UNDEF)
1218 return (sym->st_value);
1219
1220 /* If we get here, then it is undefined and needs a lookup. */
1221 switch (ELF_ST_BIND(sym->st_info)) {
1222 case STB_LOCAL:
1223 /* Local, but undefined? huh? */
1224 return (0);
1225
1226 case STB_GLOBAL:
1227 /* Relative to Data or Function name */
1228 symbol = ef->ddbstrtab + sym->st_name;
1229
1230 /* Force a lookup failure if the symbol name is bogus. */
1231 if (*symbol == 0)
1232 return (0);
1233 ret = ((Elf_Addr)linker_file_lookup_symbol(lf, symbol, deps));
1234 return ret;
1235
1236 case STB_WEAK:
1237 printf("link_elf_obj: Weak symbols not supported\n");
1238 return (0);
1239
1240 default:
1241 return (0);
1242 }
1243 }
1244
1245 static void
1246 link_elf_fix_link_set(elf_file_t ef)
1247 {
1248 static const char startn[] = "__start_";
1249 static const char stopn[] = "__stop_";
1250 Elf_Sym *sym;
1251 const char *sym_name, *linkset_name;
1252 Elf_Addr startp, stopp;
1253 Elf_Size symidx;
1254 int start, i;
1255
1256 startp = stopp = 0;
1257 for (symidx = 1 /* zero entry is special */;
1258 symidx < ef->ddbsymcnt; symidx++) {
1259 sym = ef->ddbsymtab + symidx;
1260 if (sym->st_shndx != SHN_UNDEF)
1261 continue;
1262
1263 sym_name = ef->ddbstrtab + sym->st_name;
1264 if (strncmp(sym_name, startn, sizeof(startn) - 1) == 0) {
1265 start = 1;
1266 linkset_name = sym_name + sizeof(startn) - 1;
1267 }
1268 else if (strncmp(sym_name, stopn, sizeof(stopn) - 1) == 0) {
1269 start = 0;
1270 linkset_name = sym_name + sizeof(stopn) - 1;
1271 }
1272 else
1273 continue;
1274
1275 for (i = 0; i < ef->nprogtab; i++) {
1276 if (strcmp(ef->progtab[i].name, linkset_name) == 0) {
1277 startp = (Elf_Addr)ef->progtab[i].addr;
1278 stopp = (Elf_Addr)(startp + ef->progtab[i].size);
1279 break;
1280 }
1281 }
1282 if (i == ef->nprogtab)
1283 continue;
1284
1285 sym->st_value = start ? startp : stopp;
1286 sym->st_shndx = i;
1287 }
1288 }
1289
1290 static void
1291 link_elf_reloc_local(linker_file_t lf)
1292 {
1293 elf_file_t ef = (elf_file_t)lf;
1294 const Elf_Rel *rellim;
1295 const Elf_Rel *rel;
1296 const Elf_Rela *relalim;
1297 const Elf_Rela *rela;
1298 const Elf_Sym *sym;
1299 Elf_Addr base;
1300 int i;
1301 Elf_Size symidx;
1302
1303 link_elf_fix_link_set(ef);
1304
1305 /* Perform relocations without addend if there are any: */
1306 for (i = 0; i < ef->nreltab; i++) {
1307 rel = ef->reltab[i].rel;
1308 if (rel == NULL)
1309 panic("lost a reltab!");
1310 rellim = rel + ef->reltab[i].nrel;
1311 base = findbase(ef, ef->reltab[i].sec);
1312 if (base == 0)
1313 panic("lost base for reltab");
1314 for ( ; rel < rellim; rel++) {
1315 symidx = ELF_R_SYM(rel->r_info);
1316 if (symidx >= ef->ddbsymcnt)
1317 continue;
1318 sym = ef->ddbsymtab + symidx;
1319 /* Only do local relocs */
1320 if (ELF_ST_BIND(sym->st_info) != STB_LOCAL)
1321 continue;
1322 elf_reloc_local(lf, base, rel, ELF_RELOC_REL,
1323 elf_obj_lookup);
1324 }
1325 }
1326
1327 /* Perform relocations with addend if there are any: */
1328 for (i = 0; i < ef->nrelatab; i++) {
1329 rela = ef->relatab[i].rela;
1330 if (rela == NULL)
1331 panic("lost a relatab!");
1332 relalim = rela + ef->relatab[i].nrela;
1333 base = findbase(ef, ef->relatab[i].sec);
1334 if (base == 0)
1335 panic("lost base for relatab");
1336 for ( ; rela < relalim; rela++) {
1337 symidx = ELF_R_SYM(rela->r_info);
1338 if (symidx >= ef->ddbsymcnt)
1339 continue;
1340 sym = ef->ddbsymtab + symidx;
1341 /* Only do local relocs */
1342 if (ELF_ST_BIND(sym->st_info) != STB_LOCAL)
1343 continue;
1344 elf_reloc_local(lf, base, rela, ELF_RELOC_RELA,
1345 elf_obj_lookup);
1346 }
1347 }
1348 }
1349
1350 static long
1351 link_elf_symtab_get(linker_file_t lf, const Elf_Sym **symtab)
1352 {
1353 elf_file_t ef = (elf_file_t)lf;
1354
1355 *symtab = ef->ddbsymtab;
1356
1357 if (*symtab == NULL)
1358 return (0);
1359
1360 return (ef->ddbsymcnt);
1361 }
1362
1363 static long
1364 link_elf_strtab_get(linker_file_t lf, caddr_t *strtab)
1365 {
1366 elf_file_t ef = (elf_file_t)lf;
1367
1368 *strtab = ef->ddbstrtab;
1369
1370 if (*strtab == NULL)
1371 return (0);
1372
1373 return (ef->ddbstrcnt);
1374 }
Cache object: 4414f626269ceba1287c1006d9e6b8e3
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