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/8.4/sys/kern/link_elf_obj.c 222880 2011-06-08 21:36:36Z dchagin $");
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, "set_pcpu")) {
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 int resid, flags;
444 elf_file_t ef;
445 linker_file_t lf;
446 int symtabindex;
447 int symstrindex;
448 int shstrindex;
449 int nsym;
450 int pb, rl, ra;
451 int alignmask;
452 int vfslocked;
453
454 shdr = NULL;
455 lf = NULL;
456 mapsize = 0;
457 hdr = NULL;
458
459 NDINIT(&nd, LOOKUP, FOLLOW | MPSAFE, UIO_SYSSPACE, filename, td);
460 flags = FREAD;
461 error = vn_open(&nd, &flags, 0, NULL);
462 if (error)
463 return error;
464 vfslocked = NDHASGIANT(&nd);
465 NDFREE(&nd, NDF_ONLY_PNBUF);
466 if (nd.ni_vp->v_type != VREG) {
467 error = ENOEXEC;
468 goto out;
469 }
470 #ifdef MAC
471 error = mac_kld_check_load(td->td_ucred, nd.ni_vp);
472 if (error) {
473 goto out;
474 }
475 #endif
476
477 /* Read the elf header from the file. */
478 hdr = malloc(sizeof(*hdr), M_LINKER, M_WAITOK);
479 error = vn_rdwr(UIO_READ, nd.ni_vp, (void *)hdr, sizeof(*hdr), 0,
480 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
481 &resid, td);
482 if (error)
483 goto out;
484 if (resid != 0){
485 error = ENOEXEC;
486 goto out;
487 }
488
489 if (!IS_ELF(*hdr)) {
490 error = ENOEXEC;
491 goto out;
492 }
493
494 if (hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS
495 || hdr->e_ident[EI_DATA] != ELF_TARG_DATA) {
496 link_elf_error(filename, "Unsupported file layout");
497 error = ENOEXEC;
498 goto out;
499 }
500 if (hdr->e_ident[EI_VERSION] != EV_CURRENT
501 || hdr->e_version != EV_CURRENT) {
502 link_elf_error(filename, "Unsupported file version");
503 error = ENOEXEC;
504 goto out;
505 }
506 if (hdr->e_type != ET_REL) {
507 error = ENOSYS;
508 goto out;
509 }
510 if (hdr->e_machine != ELF_TARG_MACH) {
511 link_elf_error(filename, "Unsupported machine");
512 error = ENOEXEC;
513 goto out;
514 }
515
516 lf = linker_make_file(filename, &link_elf_class);
517 if (!lf) {
518 error = ENOMEM;
519 goto out;
520 }
521 ef = (elf_file_t) lf;
522 ef->nprogtab = 0;
523 ef->e_shdr = 0;
524 ef->nreltab = 0;
525 ef->nrelatab = 0;
526
527 /* Allocate and read in the section header */
528 nbytes = hdr->e_shnum * hdr->e_shentsize;
529 if (nbytes == 0 || hdr->e_shoff == 0 ||
530 hdr->e_shentsize != sizeof(Elf_Shdr)) {
531 error = ENOEXEC;
532 goto out;
533 }
534 shdr = malloc(nbytes, M_LINKER, M_WAITOK);
535 ef->e_shdr = shdr;
536 error = vn_rdwr(UIO_READ, nd.ni_vp, (caddr_t)shdr, nbytes, hdr->e_shoff,
537 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, &resid, td);
538 if (error)
539 goto out;
540 if (resid) {
541 error = ENOEXEC;
542 goto out;
543 }
544
545 /* Scan the section header for information and table sizing. */
546 nsym = 0;
547 symtabindex = -1;
548 symstrindex = -1;
549 for (i = 0; i < hdr->e_shnum; i++) {
550 if (shdr[i].sh_size == 0)
551 continue;
552 switch (shdr[i].sh_type) {
553 case SHT_PROGBITS:
554 case SHT_NOBITS:
555 ef->nprogtab++;
556 break;
557 case SHT_SYMTAB:
558 nsym++;
559 symtabindex = i;
560 symstrindex = shdr[i].sh_link;
561 break;
562 case SHT_REL:
563 ef->nreltab++;
564 break;
565 case SHT_RELA:
566 ef->nrelatab++;
567 break;
568 case SHT_STRTAB:
569 break;
570 }
571 }
572 if (ef->nprogtab == 0) {
573 link_elf_error(filename, "file has no contents");
574 error = ENOEXEC;
575 goto out;
576 }
577 if (nsym != 1) {
578 /* Only allow one symbol table for now */
579 link_elf_error(filename, "file has no valid symbol table");
580 error = ENOEXEC;
581 goto out;
582 }
583 if (symstrindex < 0 || symstrindex > hdr->e_shnum ||
584 shdr[symstrindex].sh_type != SHT_STRTAB) {
585 link_elf_error(filename, "file has invalid symbol strings");
586 error = ENOEXEC;
587 goto out;
588 }
589
590 /* Allocate space for tracking the load chunks */
591 if (ef->nprogtab != 0)
592 ef->progtab = malloc(ef->nprogtab * sizeof(*ef->progtab),
593 M_LINKER, M_WAITOK | M_ZERO);
594 if (ef->nreltab != 0)
595 ef->reltab = malloc(ef->nreltab * sizeof(*ef->reltab),
596 M_LINKER, M_WAITOK | M_ZERO);
597 if (ef->nrelatab != 0)
598 ef->relatab = malloc(ef->nrelatab * sizeof(*ef->relatab),
599 M_LINKER, M_WAITOK | M_ZERO);
600
601 if (symtabindex == -1)
602 panic("lost symbol table index");
603 /* Allocate space for and load the symbol table */
604 ef->ddbsymcnt = shdr[symtabindex].sh_size / sizeof(Elf_Sym);
605 ef->ddbsymtab = malloc(shdr[symtabindex].sh_size, M_LINKER, M_WAITOK);
606 error = vn_rdwr(UIO_READ, nd.ni_vp, (void *)ef->ddbsymtab,
607 shdr[symtabindex].sh_size, shdr[symtabindex].sh_offset,
608 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
609 &resid, td);
610 if (error)
611 goto out;
612 if (resid != 0){
613 error = EINVAL;
614 goto out;
615 }
616
617 if (symstrindex == -1)
618 panic("lost symbol string index");
619 /* Allocate space for and load the symbol strings */
620 ef->ddbstrcnt = shdr[symstrindex].sh_size;
621 ef->ddbstrtab = malloc(shdr[symstrindex].sh_size, M_LINKER, M_WAITOK);
622 error = vn_rdwr(UIO_READ, nd.ni_vp, ef->ddbstrtab,
623 shdr[symstrindex].sh_size, shdr[symstrindex].sh_offset,
624 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
625 &resid, td);
626 if (error)
627 goto out;
628 if (resid != 0){
629 error = EINVAL;
630 goto out;
631 }
632
633 /* Do we have a string table for the section names? */
634 shstrindex = -1;
635 if (hdr->e_shstrndx != 0 &&
636 shdr[hdr->e_shstrndx].sh_type == SHT_STRTAB) {
637 shstrindex = hdr->e_shstrndx;
638 ef->shstrcnt = shdr[shstrindex].sh_size;
639 ef->shstrtab = malloc(shdr[shstrindex].sh_size, M_LINKER,
640 M_WAITOK);
641 error = vn_rdwr(UIO_READ, nd.ni_vp, ef->shstrtab,
642 shdr[shstrindex].sh_size, shdr[shstrindex].sh_offset,
643 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
644 &resid, td);
645 if (error)
646 goto out;
647 if (resid != 0){
648 error = EINVAL;
649 goto out;
650 }
651 }
652
653 /* Size up code/data(progbits) and bss(nobits). */
654 alignmask = 0;
655 for (i = 0; i < hdr->e_shnum; i++) {
656 if (shdr[i].sh_size == 0)
657 continue;
658 switch (shdr[i].sh_type) {
659 case SHT_PROGBITS:
660 case SHT_NOBITS:
661 alignmask = shdr[i].sh_addralign - 1;
662 mapsize += alignmask;
663 mapsize &= ~alignmask;
664 mapsize += shdr[i].sh_size;
665 break;
666 }
667 }
668
669 /*
670 * We know how much space we need for the text/data/bss/etc.
671 * This stuff needs to be in a single chunk so that profiling etc
672 * can get the bounds and gdb can associate offsets with modules
673 */
674 ef->object = vm_object_allocate(OBJT_DEFAULT,
675 round_page(mapsize) >> PAGE_SHIFT);
676 if (ef->object == NULL) {
677 error = ENOMEM;
678 goto out;
679 }
680 ef->address = (caddr_t) vm_map_min(kernel_map);
681
682 /*
683 * In order to satisfy amd64's architectural requirements on the
684 * location of code and data in the kernel's address space, request a
685 * mapping that is above the kernel.
686 */
687 mapbase = KERNBASE;
688 error = vm_map_find(kernel_map, ef->object, 0, &mapbase,
689 round_page(mapsize), TRUE, VM_PROT_ALL, VM_PROT_ALL, FALSE);
690 if (error) {
691 vm_object_deallocate(ef->object);
692 ef->object = 0;
693 goto out;
694 }
695
696 /* Wire the pages */
697 error = vm_map_wire(kernel_map, mapbase,
698 mapbase + round_page(mapsize),
699 VM_MAP_WIRE_SYSTEM|VM_MAP_WIRE_NOHOLES);
700 if (error != KERN_SUCCESS) {
701 error = ENOMEM;
702 goto out;
703 }
704
705 /* Inform the kld system about the situation */
706 lf->address = ef->address = (caddr_t)mapbase;
707 lf->size = mapsize;
708
709 /*
710 * Now load code/data(progbits), zero bss(nobits), allocate space for
711 * and load relocs
712 */
713 pb = 0;
714 rl = 0;
715 ra = 0;
716 alignmask = 0;
717 for (i = 0; i < hdr->e_shnum; i++) {
718 if (shdr[i].sh_size == 0)
719 continue;
720 switch (shdr[i].sh_type) {
721 case SHT_PROGBITS:
722 case SHT_NOBITS:
723 alignmask = shdr[i].sh_addralign - 1;
724 mapbase += alignmask;
725 mapbase &= ~alignmask;
726 if (ef->shstrtab && shdr[i].sh_name != 0)
727 ef->progtab[pb].name =
728 ef->shstrtab + shdr[i].sh_name;
729 else if (shdr[i].sh_type == SHT_PROGBITS)
730 ef->progtab[pb].name = "<<PROGBITS>>";
731 else
732 ef->progtab[pb].name = "<<NOBITS>>";
733 if (ef->progtab[pb].name != NULL &&
734 !strcmp(ef->progtab[pb].name, "set_pcpu"))
735 ef->progtab[pb].addr =
736 dpcpu_alloc(shdr[i].sh_size);
737 #ifdef VIMAGE
738 else if (ef->progtab[pb].name != NULL &&
739 !strcmp(ef->progtab[pb].name, VNET_SETNAME))
740 ef->progtab[pb].addr =
741 vnet_data_alloc(shdr[i].sh_size);
742 #endif
743 else
744 ef->progtab[pb].addr =
745 (void *)(uintptr_t)mapbase;
746 if (ef->progtab[pb].addr == NULL) {
747 error = ENOSPC;
748 goto out;
749 }
750 ef->progtab[pb].size = shdr[i].sh_size;
751 ef->progtab[pb].sec = i;
752 if (shdr[i].sh_type == SHT_PROGBITS) {
753 error = vn_rdwr(UIO_READ, nd.ni_vp,
754 ef->progtab[pb].addr,
755 shdr[i].sh_size, shdr[i].sh_offset,
756 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred,
757 NOCRED, &resid, td);
758 if (error)
759 goto out;
760 if (resid != 0){
761 error = EINVAL;
762 goto out;
763 }
764 /* Initialize the per-cpu or vnet area. */
765 if (ef->progtab[pb].addr != (void *)mapbase &&
766 !strcmp(ef->progtab[pb].name, "set_pcpu"))
767 dpcpu_copy(ef->progtab[pb].addr,
768 shdr[i].sh_size);
769 #ifdef VIMAGE
770 else if (ef->progtab[pb].addr !=
771 (void *)mapbase &&
772 !strcmp(ef->progtab[pb].name, VNET_SETNAME))
773 vnet_data_copy(ef->progtab[pb].addr,
774 shdr[i].sh_size);
775 #endif
776 } else
777 bzero(ef->progtab[pb].addr, shdr[i].sh_size);
778
779 /* Update all symbol values with the offset. */
780 for (j = 0; j < ef->ddbsymcnt; j++) {
781 es = &ef->ddbsymtab[j];
782 if (es->st_shndx != i)
783 continue;
784 es->st_value += (Elf_Addr)ef->progtab[pb].addr;
785 }
786 mapbase += shdr[i].sh_size;
787 pb++;
788 break;
789 case SHT_REL:
790 ef->reltab[rl].rel = malloc(shdr[i].sh_size, M_LINKER,
791 M_WAITOK);
792 ef->reltab[rl].nrel = shdr[i].sh_size / sizeof(Elf_Rel);
793 ef->reltab[rl].sec = shdr[i].sh_info;
794 error = vn_rdwr(UIO_READ, nd.ni_vp,
795 (void *)ef->reltab[rl].rel,
796 shdr[i].sh_size, shdr[i].sh_offset,
797 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
798 &resid, td);
799 if (error)
800 goto out;
801 if (resid != 0){
802 error = EINVAL;
803 goto out;
804 }
805 rl++;
806 break;
807 case SHT_RELA:
808 ef->relatab[ra].rela = malloc(shdr[i].sh_size, M_LINKER,
809 M_WAITOK);
810 ef->relatab[ra].nrela =
811 shdr[i].sh_size / sizeof(Elf_Rela);
812 ef->relatab[ra].sec = shdr[i].sh_info;
813 error = vn_rdwr(UIO_READ, nd.ni_vp,
814 (void *)ef->relatab[ra].rela,
815 shdr[i].sh_size, shdr[i].sh_offset,
816 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
817 &resid, td);
818 if (error)
819 goto out;
820 if (resid != 0){
821 error = EINVAL;
822 goto out;
823 }
824 ra++;
825 break;
826 }
827 }
828 if (pb != ef->nprogtab)
829 panic("lost progbits");
830 if (rl != ef->nreltab)
831 panic("lost reltab");
832 if (ra != ef->nrelatab)
833 panic("lost relatab");
834 if (mapbase != (vm_offset_t)ef->address + mapsize)
835 panic("mapbase 0x%lx != address %p + mapsize 0x%lx (0x%lx)\n",
836 (u_long)mapbase, ef->address, (u_long)mapsize,
837 (u_long)(vm_offset_t)ef->address + mapsize);
838
839 /* Local intra-module relocations */
840 link_elf_reloc_local(lf);
841
842 /* Pull in dependencies */
843 VOP_UNLOCK(nd.ni_vp, 0);
844 error = linker_load_dependencies(lf);
845 vn_lock(nd.ni_vp, LK_EXCLUSIVE | LK_RETRY);
846 if (error)
847 goto out;
848
849 /* External relocations */
850 error = relocate_file(ef);
851 if (error)
852 goto out;
853
854 /* Notify MD code that a module is being loaded. */
855 error = elf_cpu_load_file(lf);
856 if (error)
857 goto out;
858
859 *result = lf;
860
861 out:
862 VOP_UNLOCK(nd.ni_vp, 0);
863 vn_close(nd.ni_vp, FREAD, td->td_ucred, td);
864 VFS_UNLOCK_GIANT(vfslocked);
865 if (error && lf)
866 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
867 if (hdr)
868 free(hdr, M_LINKER);
869
870 return error;
871 }
872
873 static void
874 link_elf_unload_file(linker_file_t file)
875 {
876 elf_file_t ef = (elf_file_t) file;
877 int i;
878
879 /* Notify MD code that a module is being unloaded. */
880 elf_cpu_unload_file(file);
881
882 if (ef->progtab) {
883 for (i = 0; i < ef->nprogtab; i++) {
884 if (ef->progtab[i].size == 0)
885 continue;
886 if (ef->progtab[i].name == NULL)
887 continue;
888 if (!strcmp(ef->progtab[i].name, "set_pcpu"))
889 dpcpu_free(ef->progtab[i].addr,
890 ef->progtab[i].size);
891 #ifdef VIMAGE
892 else if (!strcmp(ef->progtab[i].name, VNET_SETNAME))
893 vnet_data_free(ef->progtab[i].addr,
894 ef->progtab[i].size);
895 #endif
896 }
897 }
898 if (ef->preloaded) {
899 if (ef->reltab)
900 free(ef->reltab, M_LINKER);
901 if (ef->relatab)
902 free(ef->relatab, M_LINKER);
903 if (ef->progtab)
904 free(ef->progtab, M_LINKER);
905 if (ef->ctftab)
906 free(ef->ctftab, M_LINKER);
907 if (ef->ctfoff)
908 free(ef->ctfoff, M_LINKER);
909 if (ef->typoff)
910 free(ef->typoff, M_LINKER);
911 if (file->filename != NULL)
912 preload_delete_name(file->filename);
913 /* XXX reclaim module memory? */
914 return;
915 }
916
917 for (i = 0; i < ef->nreltab; i++)
918 if (ef->reltab[i].rel)
919 free(ef->reltab[i].rel, M_LINKER);
920 for (i = 0; i < ef->nrelatab; i++)
921 if (ef->relatab[i].rela)
922 free(ef->relatab[i].rela, M_LINKER);
923 if (ef->reltab)
924 free(ef->reltab, M_LINKER);
925 if (ef->relatab)
926 free(ef->relatab, M_LINKER);
927 if (ef->progtab)
928 free(ef->progtab, M_LINKER);
929
930 if (ef->object) {
931 vm_map_remove(kernel_map, (vm_offset_t) ef->address,
932 (vm_offset_t) ef->address +
933 (ef->object->size << PAGE_SHIFT));
934 }
935 if (ef->e_shdr)
936 free(ef->e_shdr, M_LINKER);
937 if (ef->ddbsymtab)
938 free(ef->ddbsymtab, M_LINKER);
939 if (ef->ddbstrtab)
940 free(ef->ddbstrtab, M_LINKER);
941 if (ef->shstrtab)
942 free(ef->shstrtab, M_LINKER);
943 if (ef->ctftab)
944 free(ef->ctftab, M_LINKER);
945 if (ef->ctfoff)
946 free(ef->ctfoff, M_LINKER);
947 if (ef->typoff)
948 free(ef->typoff, M_LINKER);
949 }
950
951 static const char *
952 symbol_name(elf_file_t ef, Elf_Size r_info)
953 {
954 const Elf_Sym *ref;
955
956 if (ELF_R_SYM(r_info)) {
957 ref = ef->ddbsymtab + ELF_R_SYM(r_info);
958 return ef->ddbstrtab + ref->st_name;
959 } else
960 return NULL;
961 }
962
963 static Elf_Addr
964 findbase(elf_file_t ef, int sec)
965 {
966 int i;
967 Elf_Addr base = 0;
968
969 for (i = 0; i < ef->nprogtab; i++) {
970 if (sec == ef->progtab[i].sec) {
971 base = (Elf_Addr)ef->progtab[i].addr;
972 break;
973 }
974 }
975 return base;
976 }
977
978 static int
979 relocate_file(elf_file_t ef)
980 {
981 const Elf_Rel *rellim;
982 const Elf_Rel *rel;
983 const Elf_Rela *relalim;
984 const Elf_Rela *rela;
985 const char *symname;
986 const Elf_Sym *sym;
987 int i;
988 Elf_Size symidx;
989 Elf_Addr base;
990
991
992 /* Perform relocations without addend if there are any: */
993 for (i = 0; i < ef->nreltab; i++) {
994 rel = ef->reltab[i].rel;
995 if (rel == NULL)
996 panic("lost a reltab!");
997 rellim = rel + ef->reltab[i].nrel;
998 base = findbase(ef, ef->reltab[i].sec);
999 if (base == 0)
1000 panic("lost base for reltab");
1001 for ( ; rel < rellim; rel++) {
1002 symidx = ELF_R_SYM(rel->r_info);
1003 if (symidx >= ef->ddbsymcnt)
1004 continue;
1005 sym = ef->ddbsymtab + symidx;
1006 /* Local relocs are already done */
1007 if (ELF_ST_BIND(sym->st_info) == STB_LOCAL)
1008 continue;
1009 if (elf_reloc(&ef->lf, base, rel, ELF_RELOC_REL,
1010 elf_obj_lookup)) {
1011 symname = symbol_name(ef, rel->r_info);
1012 printf("link_elf_obj: symbol %s undefined\n",
1013 symname);
1014 return ENOENT;
1015 }
1016 }
1017 }
1018
1019 /* Perform relocations with addend if there are any: */
1020 for (i = 0; i < ef->nrelatab; i++) {
1021 rela = ef->relatab[i].rela;
1022 if (rela == NULL)
1023 panic("lost a relatab!");
1024 relalim = rela + ef->relatab[i].nrela;
1025 base = findbase(ef, ef->relatab[i].sec);
1026 if (base == 0)
1027 panic("lost base for relatab");
1028 for ( ; rela < relalim; rela++) {
1029 symidx = ELF_R_SYM(rela->r_info);
1030 if (symidx >= ef->ddbsymcnt)
1031 continue;
1032 sym = ef->ddbsymtab + symidx;
1033 /* Local relocs are already done */
1034 if (ELF_ST_BIND(sym->st_info) == STB_LOCAL)
1035 continue;
1036 if (elf_reloc(&ef->lf, base, rela, ELF_RELOC_RELA,
1037 elf_obj_lookup)) {
1038 symname = symbol_name(ef, rela->r_info);
1039 printf("link_elf_obj: symbol %s undefined\n",
1040 symname);
1041 return ENOENT;
1042 }
1043 }
1044 }
1045
1046 return 0;
1047 }
1048
1049 static int
1050 link_elf_lookup_symbol(linker_file_t lf, const char *name, c_linker_sym_t *sym)
1051 {
1052 elf_file_t ef = (elf_file_t) lf;
1053 const Elf_Sym *symp;
1054 const char *strp;
1055 int i;
1056
1057 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) {
1058 strp = ef->ddbstrtab + symp->st_name;
1059 if (symp->st_shndx != SHN_UNDEF && strcmp(name, strp) == 0) {
1060 *sym = (c_linker_sym_t) symp;
1061 return 0;
1062 }
1063 }
1064 return ENOENT;
1065 }
1066
1067 static int
1068 link_elf_symbol_values(linker_file_t lf, c_linker_sym_t sym,
1069 linker_symval_t *symval)
1070 {
1071 elf_file_t ef = (elf_file_t) lf;
1072 const Elf_Sym *es = (const Elf_Sym*) sym;
1073
1074 if (es >= ef->ddbsymtab && es < (ef->ddbsymtab + ef->ddbsymcnt)) {
1075 symval->name = ef->ddbstrtab + es->st_name;
1076 symval->value = (caddr_t)es->st_value;
1077 symval->size = es->st_size;
1078 return 0;
1079 }
1080 return ENOENT;
1081 }
1082
1083 static int
1084 link_elf_search_symbol(linker_file_t lf, caddr_t value,
1085 c_linker_sym_t *sym, long *diffp)
1086 {
1087 elf_file_t ef = (elf_file_t) lf;
1088 u_long off = (uintptr_t) (void *) value;
1089 u_long diff = off;
1090 u_long st_value;
1091 const Elf_Sym *es;
1092 const Elf_Sym *best = 0;
1093 int i;
1094
1095 for (i = 0, es = ef->ddbsymtab; i < ef->ddbsymcnt; i++, es++) {
1096 if (es->st_name == 0)
1097 continue;
1098 st_value = es->st_value;
1099 if (off >= st_value) {
1100 if (off - st_value < diff) {
1101 diff = off - st_value;
1102 best = es;
1103 if (diff == 0)
1104 break;
1105 } else if (off - st_value == diff) {
1106 best = es;
1107 }
1108 }
1109 }
1110 if (best == 0)
1111 *diffp = off;
1112 else
1113 *diffp = diff;
1114 *sym = (c_linker_sym_t) best;
1115
1116 return 0;
1117 }
1118
1119 /*
1120 * Look up a linker set on an ELF system.
1121 */
1122 static int
1123 link_elf_lookup_set(linker_file_t lf, const char *name,
1124 void ***startp, void ***stopp, int *countp)
1125 {
1126 elf_file_t ef = (elf_file_t)lf;
1127 void **start, **stop;
1128 int i, count;
1129
1130 /* Relative to section number */
1131 for (i = 0; i < ef->nprogtab; i++) {
1132 if ((strncmp(ef->progtab[i].name, "set_", 4) == 0) &&
1133 strcmp(ef->progtab[i].name + 4, name) == 0) {
1134 start = (void **)ef->progtab[i].addr;
1135 stop = (void **)((char *)ef->progtab[i].addr +
1136 ef->progtab[i].size);
1137 count = stop - start;
1138 if (startp)
1139 *startp = start;
1140 if (stopp)
1141 *stopp = stop;
1142 if (countp)
1143 *countp = count;
1144 return (0);
1145 }
1146 }
1147 return (ESRCH);
1148 }
1149
1150 static int
1151 link_elf_each_function_name(linker_file_t file,
1152 int (*callback)(const char *, void *), void *opaque)
1153 {
1154 elf_file_t ef = (elf_file_t)file;
1155 const Elf_Sym *symp;
1156 int i, error;
1157
1158 /* Exhaustive search */
1159 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) {
1160 if (symp->st_value != 0 &&
1161 ELF_ST_TYPE(symp->st_info) == STT_FUNC) {
1162 error = callback(ef->ddbstrtab + symp->st_name, opaque);
1163 if (error)
1164 return (error);
1165 }
1166 }
1167 return (0);
1168 }
1169
1170 static int
1171 link_elf_each_function_nameval(linker_file_t file,
1172 linker_function_nameval_callback_t callback, void *opaque)
1173 {
1174 linker_symval_t symval;
1175 elf_file_t ef = (elf_file_t)file;
1176 const Elf_Sym* symp;
1177 int i, error;
1178
1179 /* Exhaustive search */
1180 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) {
1181 if (symp->st_value != 0 &&
1182 ELF_ST_TYPE(symp->st_info) == STT_FUNC) {
1183 error = link_elf_symbol_values(file, (c_linker_sym_t) symp, &symval);
1184 if (error)
1185 return (error);
1186 error = callback(file, i, &symval, opaque);
1187 if (error)
1188 return (error);
1189 }
1190 }
1191 return (0);
1192 }
1193
1194 /*
1195 * Symbol lookup function that can be used when the symbol index is known (ie
1196 * in relocations). It uses the symbol index instead of doing a fully fledged
1197 * hash table based lookup when such is valid. For example for local symbols.
1198 * This is not only more efficient, it's also more correct. It's not always
1199 * the case that the symbol can be found through the hash table.
1200 */
1201 static Elf_Addr
1202 elf_obj_lookup(linker_file_t lf, Elf_Size symidx, int deps)
1203 {
1204 elf_file_t ef = (elf_file_t)lf;
1205 const Elf_Sym *sym;
1206 const char *symbol;
1207 Elf_Addr ret;
1208
1209 /* Don't even try to lookup the symbol if the index is bogus. */
1210 if (symidx >= ef->ddbsymcnt)
1211 return (0);
1212
1213 sym = ef->ddbsymtab + symidx;
1214
1215 /* Quick answer if there is a definition included. */
1216 if (sym->st_shndx != SHN_UNDEF)
1217 return (sym->st_value);
1218
1219 /* If we get here, then it is undefined and needs a lookup. */
1220 switch (ELF_ST_BIND(sym->st_info)) {
1221 case STB_LOCAL:
1222 /* Local, but undefined? huh? */
1223 return (0);
1224
1225 case STB_GLOBAL:
1226 /* Relative to Data or Function name */
1227 symbol = ef->ddbstrtab + sym->st_name;
1228
1229 /* Force a lookup failure if the symbol name is bogus. */
1230 if (*symbol == 0)
1231 return (0);
1232 ret = ((Elf_Addr)linker_file_lookup_symbol(lf, symbol, deps));
1233 return ret;
1234
1235 case STB_WEAK:
1236 printf("link_elf_obj: Weak symbols not supported\n");
1237 return (0);
1238
1239 default:
1240 return (0);
1241 }
1242 }
1243
1244 static void
1245 link_elf_fix_link_set(elf_file_t ef)
1246 {
1247 static const char startn[] = "__start_";
1248 static const char stopn[] = "__stop_";
1249 Elf_Sym *sym;
1250 const char *sym_name, *linkset_name;
1251 Elf_Addr startp, stopp;
1252 Elf_Size symidx;
1253 int start, i;
1254
1255 startp = stopp = 0;
1256 for (symidx = 1 /* zero entry is special */;
1257 symidx < ef->ddbsymcnt; symidx++) {
1258 sym = ef->ddbsymtab + symidx;
1259 if (sym->st_shndx != SHN_UNDEF)
1260 continue;
1261
1262 sym_name = ef->ddbstrtab + sym->st_name;
1263 if (strncmp(sym_name, startn, sizeof(startn) - 1) == 0) {
1264 start = 1;
1265 linkset_name = sym_name + sizeof(startn) - 1;
1266 }
1267 else if (strncmp(sym_name, stopn, sizeof(stopn) - 1) == 0) {
1268 start = 0;
1269 linkset_name = sym_name + sizeof(stopn) - 1;
1270 }
1271 else
1272 continue;
1273
1274 for (i = 0; i < ef->nprogtab; i++) {
1275 if (strcmp(ef->progtab[i].name, linkset_name) == 0) {
1276 startp = (Elf_Addr)ef->progtab[i].addr;
1277 stopp = (Elf_Addr)(startp + ef->progtab[i].size);
1278 break;
1279 }
1280 }
1281 if (i == ef->nprogtab)
1282 continue;
1283
1284 sym->st_value = start ? startp : stopp;
1285 sym->st_shndx = i;
1286 }
1287 }
1288
1289 static void
1290 link_elf_reloc_local(linker_file_t lf)
1291 {
1292 elf_file_t ef = (elf_file_t)lf;
1293 const Elf_Rel *rellim;
1294 const Elf_Rel *rel;
1295 const Elf_Rela *relalim;
1296 const Elf_Rela *rela;
1297 const Elf_Sym *sym;
1298 Elf_Addr base;
1299 int i;
1300 Elf_Size symidx;
1301
1302 link_elf_fix_link_set(ef);
1303
1304 /* Perform relocations without addend if there are any: */
1305 for (i = 0; i < ef->nreltab; i++) {
1306 rel = ef->reltab[i].rel;
1307 if (rel == NULL)
1308 panic("lost a reltab!");
1309 rellim = rel + ef->reltab[i].nrel;
1310 base = findbase(ef, ef->reltab[i].sec);
1311 if (base == 0)
1312 panic("lost base for reltab");
1313 for ( ; rel < rellim; rel++) {
1314 symidx = ELF_R_SYM(rel->r_info);
1315 if (symidx >= ef->ddbsymcnt)
1316 continue;
1317 sym = ef->ddbsymtab + symidx;
1318 /* Only do local relocs */
1319 if (ELF_ST_BIND(sym->st_info) != STB_LOCAL)
1320 continue;
1321 elf_reloc_local(lf, base, rel, ELF_RELOC_REL,
1322 elf_obj_lookup);
1323 }
1324 }
1325
1326 /* Perform relocations with addend if there are any: */
1327 for (i = 0; i < ef->nrelatab; i++) {
1328 rela = ef->relatab[i].rela;
1329 if (rela == NULL)
1330 panic("lost a relatab!");
1331 relalim = rela + ef->relatab[i].nrela;
1332 base = findbase(ef, ef->relatab[i].sec);
1333 if (base == 0)
1334 panic("lost base for relatab");
1335 for ( ; rela < relalim; rela++) {
1336 symidx = ELF_R_SYM(rela->r_info);
1337 if (symidx >= ef->ddbsymcnt)
1338 continue;
1339 sym = ef->ddbsymtab + symidx;
1340 /* Only do local relocs */
1341 if (ELF_ST_BIND(sym->st_info) != STB_LOCAL)
1342 continue;
1343 elf_reloc_local(lf, base, rela, ELF_RELOC_RELA,
1344 elf_obj_lookup);
1345 }
1346 }
1347 }
1348
1349 static long
1350 link_elf_symtab_get(linker_file_t lf, const Elf_Sym **symtab)
1351 {
1352 elf_file_t ef = (elf_file_t)lf;
1353
1354 *symtab = ef->ddbsymtab;
1355
1356 if (*symtab == NULL)
1357 return (0);
1358
1359 return (ef->ddbsymcnt);
1360 }
1361
1362 static long
1363 link_elf_strtab_get(linker_file_t lf, caddr_t *strtab)
1364 {
1365 elf_file_t ef = (elf_file_t)lf;
1366
1367 *strtab = ef->ddbstrtab;
1368
1369 if (*strtab == NULL)
1370 return (0);
1371
1372 return (ef->ddbstrcnt);
1373 }
Cache object: a0c47047db3a0b1f5f7321010c087713
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