vkernel64 - Push some non-working (as yet) shims for module loading
[dragonfly.git] / sys / kern / link_elf_obj.c
CommitLineData
28730bd3
SS
1/*-
2 * Copyright (c) 1998 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 * $FreeBSD: src/sys/kern/link_elf.c,v 1.24 1999/12/24 15:33:36 bde Exp $
28 * $DragonFly: src/sys/kern/link_elf.c,v 1.29 2008/08/01 23:11:16 dillon Exp $
29 */
30
31#include <sys/param.h>
32#include <sys/kernel.h>
33#include <sys/systm.h>
34#include <sys/malloc.h>
35#include <sys/proc.h>
36#include <sys/nlookup.h>
37#include <sys/fcntl.h>
38#include <sys/vnode.h>
39#include <sys/linker.h>
40#include <machine/elf.h>
41
42#include <vm/vm.h>
43#include <vm/vm_param.h>
44#include <vm/vm_zone.h>
45#include <vm/vm_object.h>
46#include <vm/vm_kern.h>
47#include <vm/vm_extern.h>
48#include <sys/lock.h>
49#include <vm/pmap.h>
50#include <vm/vm_map.h>
51
52static int link_elf_obj_preload_file(const char *, linker_file_t *);
53static int link_elf_obj_preload_finish(linker_file_t);
54static int link_elf_obj_load_file(const char *, linker_file_t *);
55static int
56link_elf_obj_lookup_symbol(linker_file_t, const char *,
57 c_linker_sym_t *);
58static int link_elf_obj_symbol_values(linker_file_t, c_linker_sym_t, linker_symval_t *);
59static int
60link_elf_obj_search_symbol(linker_file_t, caddr_t value,
61 c_linker_sym_t * sym, long *diffp);
62
63static void link_elf_obj_unload_file(linker_file_t);
64static int
65link_elf_obj_lookup_set(linker_file_t, const char *,
66 void ***, void ***, int *);
67static void link_elf_obj_reloc_local(linker_file_t lf);
68static int elf_obj_lookup(linker_file_t lf, Elf_Size symidx, int deps, Elf_Addr *);
69
70static struct linker_class_ops link_elf_obj_class_ops = {
71 link_elf_obj_load_file,
72 link_elf_obj_preload_file,
73};
74
75static struct linker_file_ops link_elf_obj_file_ops = {
76 .lookup_symbol = link_elf_obj_lookup_symbol,
77 .symbol_values = link_elf_obj_symbol_values,
78 .search_symbol = link_elf_obj_search_symbol,
79 .preload_finish = link_elf_obj_preload_finish,
80 .unload = link_elf_obj_unload_file,
81 .lookup_set = link_elf_obj_lookup_set,
82};
83
84typedef struct {
85 void *addr;
86 Elf_Off size;
87 int flags;
88 int sec; /* Original section */
89 char *name;
90} Elf_progent;
91
92typedef struct {
93 Elf_Rel *rel;
94 int nrel;
95 int sec;
96} Elf_relent;
97
98typedef struct {
99 Elf_Rela *rela;
100 int nrela;
101 int sec;
102} Elf_relaent;
103
104
105typedef struct elf_file {
106 int preloaded;
107
108 caddr_t address; /* Relocation address */
d63ed24b 109 size_t bytes; /* Chunk size in bytes */
28730bd3
SS
110 vm_object_t object; /* VM object to hold file pages */
111 Elf_Shdr *e_shdr;
112
113 Elf_progent *progtab;
114 int nprogtab;
115
116 Elf_relaent *relatab;
117 int nrelatab;
118
119 Elf_relent *reltab;
120 int nreltab;
121
122 Elf_Sym *ddbsymtab; /* The symbol table we are using */
123 long ddbsymcnt; /* Number of symbols */
124 caddr_t ddbstrtab; /* String table */
125 long ddbstrcnt; /* number of bytes in string table */
126
127 caddr_t shstrtab; /* Section name string table */
128 long shstrcnt; /* number of bytes in string table */
129
130 caddr_t ctftab; /* CTF table */
131 long ctfcnt; /* number of bytes in CTF table */
132 caddr_t ctfoff; /* CTF offset table */
133 caddr_t typoff; /* Type offset table */
134 long typlen; /* Number of type entries. */
135
136} *elf_file_t;
137
138static int relocate_file(linker_file_t lf);
139
140/*
141 * The kernel symbol table starts here.
142 */
143extern struct _dynamic _DYNAMIC;
144
145static void
146link_elf_obj_init(void *arg)
147{
148#if ELF_TARG_CLASS == ELFCLASS32
149 linker_add_class("elf32", NULL, &link_elf_obj_class_ops);
150#else
151 linker_add_class("elf64", NULL, &link_elf_obj_class_ops);
152#endif
153}
154
155SYSINIT(link_elf, SI_BOOT2_KLD, SI_ORDER_SECOND, link_elf_obj_init, 0);
156
157static void
158link_elf_obj_error(const char *file, const char *s)
159{
160 kprintf("kldload: %s: %s\n", file, s);
161}
162
163static int
164link_elf_obj_preload_file(const char *filename, linker_file_t *result)
165{
166 Elf_Ehdr *hdr;
167 Elf_Shdr *shdr;
168 Elf_Sym *es;
169 caddr_t modptr, baseptr, sizeptr;
170 char *type;
171 elf_file_t ef;
172 linker_file_t lf;
173 Elf_Addr off;
174 int error, i, j, pb, ra, rl, shstrindex, symstrindex, symtabindex;
175
176 /*
177 * Look to see if we have the module preloaded.
178 */
179 modptr = preload_search_by_name(filename);
180 if (modptr == NULL)
181 return ENOENT;
182
183 /* It's preloaded, check we can handle it and collect information */
184 type = (char *)preload_search_info(modptr, MODINFO_TYPE);
185 baseptr = preload_search_info(modptr, MODINFO_ADDR);
186 sizeptr = preload_search_info(modptr, MODINFO_SIZE);
187 hdr = (Elf_Ehdr *) preload_search_info(modptr, MODINFO_METADATA |
188 MODINFOMD_ELFHDR);
189 shdr = (Elf_Shdr *) preload_search_info(modptr, MODINFO_METADATA |
190 MODINFOMD_SHDR);
191 if (type == NULL ||
192 (strcmp(type, "elf" __XSTRING(__ELF_WORD_SIZE) " obj module") != 0 &&
193 strcmp(type, "elf obj module") != 0)) {
194 return (EFTYPE);
195 }
196 if (baseptr == NULL || sizeptr == NULL || hdr == NULL || shdr == NULL)
197 return (EINVAL);
198
199 ef = kmalloc(sizeof(struct elf_file), M_LINKER, M_WAITOK | M_ZERO);
200 ef->preloaded = 1;
201 ef->address = *(caddr_t *) baseptr;
d63ed24b 202 ef->bytes = 0;
28730bd3
SS
203 lf = linker_make_file(filename, ef, &link_elf_obj_file_ops);
204 if (lf == NULL) {
205 kfree(ef, M_LINKER);
206 return ENOMEM;
207 }
208 lf->address = ef->address;
209 lf->size = *(size_t *) sizeptr;
210
211 if (hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS ||
212 hdr->e_ident[EI_DATA] != ELF_TARG_DATA ||
213 hdr->e_ident[EI_VERSION] != EV_CURRENT ||
214 hdr->e_version != EV_CURRENT ||
215 hdr->e_type != ET_REL ||
216 hdr->e_machine != ELF_TARG_MACH) {
217 error = EFTYPE;
218 goto out;
219 }
220 ef->e_shdr = shdr;
221
222 /* Scan the section header for information and table sizing. */
223 symtabindex = -1;
224 symstrindex = -1;
225 for (i = 0; i < hdr->e_shnum; i++) {
226 switch (shdr[i].sh_type) {
227 case SHT_PROGBITS:
228 case SHT_NOBITS:
229 ef->nprogtab++;
230 break;
231 case SHT_SYMTAB:
232 symtabindex = i;
233 symstrindex = shdr[i].sh_link;
234 break;
235 case SHT_REL:
236 ef->nreltab++;
237 break;
238 case SHT_RELA:
239 ef->nrelatab++;
240 break;
241 }
242 }
243
244 shstrindex = hdr->e_shstrndx;
245 if (ef->nprogtab == 0 || symstrindex < 0 ||
246 symstrindex >= hdr->e_shnum ||
247 shdr[symstrindex].sh_type != SHT_STRTAB || shstrindex == 0 ||
248 shstrindex >= hdr->e_shnum ||
249 shdr[shstrindex].sh_type != SHT_STRTAB) {
250 error = ENOEXEC;
251 goto out;
252 }
253 /* Allocate space for tracking the load chunks */
254 if (ef->nprogtab != 0)
255 ef->progtab = kmalloc(ef->nprogtab * sizeof(*ef->progtab),
256 M_LINKER, M_WAITOK | M_ZERO);
257 if (ef->nreltab != 0)
258 ef->reltab = kmalloc(ef->nreltab * sizeof(*ef->reltab),
259 M_LINKER, M_WAITOK | M_ZERO);
260 if (ef->nrelatab != 0)
261 ef->relatab = kmalloc(ef->nrelatab * sizeof(*ef->relatab),
262 M_LINKER, M_WAITOK | M_ZERO);
263 if ((ef->nprogtab != 0 && ef->progtab == NULL) ||
264 (ef->nreltab != 0 && ef->reltab == NULL) ||
265 (ef->nrelatab != 0 && ef->relatab == NULL)) {
266 error = ENOMEM;
267 goto out;
268 }
269 /* XXX, relocate the sh_addr fields saved by the loader. */
270 off = 0;
271 for (i = 0; i < hdr->e_shnum; i++) {
272 if (shdr[i].sh_addr != 0 && (off == 0 || shdr[i].sh_addr < off))
273 off = shdr[i].sh_addr;
274 }
275 for (i = 0; i < hdr->e_shnum; i++) {
276 if (shdr[i].sh_addr != 0)
277 shdr[i].sh_addr = shdr[i].sh_addr - off +
278 (Elf_Addr) ef->address;
279 }
280
281 ef->ddbsymcnt = shdr[symtabindex].sh_size / sizeof(Elf_Sym);
282 ef->ddbsymtab = (Elf_Sym *) shdr[symtabindex].sh_addr;
283 ef->ddbstrcnt = shdr[symstrindex].sh_size;
284 ef->ddbstrtab = (char *)shdr[symstrindex].sh_addr;
285 ef->shstrcnt = shdr[shstrindex].sh_size;
286 ef->shstrtab = (char *)shdr[shstrindex].sh_addr;
287
288 /* Now fill out progtab and the relocation tables. */
289 pb = 0;
290 rl = 0;
291 ra = 0;
292 for (i = 0; i < hdr->e_shnum; i++) {
293 switch (shdr[i].sh_type) {
294 case SHT_PROGBITS:
295 case SHT_NOBITS:
296 ef->progtab[pb].addr = (void *)shdr[i].sh_addr;
297 if (shdr[i].sh_type == SHT_PROGBITS)
298 ef->progtab[pb].name = "<<PROGBITS>>";
299 else
300 ef->progtab[pb].name = "<<NOBITS>>";
301 ef->progtab[pb].size = shdr[i].sh_size;
302 ef->progtab[pb].sec = i;
303 if (ef->shstrtab && shdr[i].sh_name != 0)
304 ef->progtab[pb].name =
305 ef->shstrtab + shdr[i].sh_name;
306#if 0
307 if (ef->progtab[pb].name != NULL &&
308 !strcmp(ef->progtab[pb].name, "set_pcpu")) {
309 void *dpcpu;
310
311 dpcpu = dpcpu_alloc(shdr[i].sh_size);
312 if (dpcpu == NULL) {
313 error = ENOSPC;
314 goto out;
315 }
316 memcpy(dpcpu, ef->progtab[pb].addr,
317 ef->progtab[pb].size);
318 dpcpu_copy(dpcpu, shdr[i].sh_size);
319 ef->progtab[pb].addr = dpcpu;
320#ifdef VIMAGE
321 } else if (ef->progtab[pb].name != NULL &&
322 !strcmp(ef->progtab[pb].name, VNET_SETNAME)) {
323 void *vnet_data;
324
325 vnet_data = vnet_data_alloc(shdr[i].sh_size);
326 if (vnet_data == NULL) {
327 error = ENOSPC;
328 goto out;
329 }
330 memcpy(vnet_data, ef->progtab[pb].addr,
331 ef->progtab[pb].size);
332 vnet_data_copy(vnet_data, shdr[i].sh_size);
333 ef->progtab[pb].addr = vnet_data;
334#endif
335 }
336#endif
337 /* Update all symbol values with the offset. */
338 for (j = 0; j < ef->ddbsymcnt; j++) {
339 es = &ef->ddbsymtab[j];
340 if (es->st_shndx != i)
341 continue;
342 es->st_value += (Elf_Addr) ef->progtab[pb].addr;
343 }
344 pb++;
345 break;
346 case SHT_REL:
347 ef->reltab[rl].rel = (Elf_Rel *) shdr[i].sh_addr;
348 ef->reltab[rl].nrel = shdr[i].sh_size / sizeof(Elf_Rel);
349 ef->reltab[rl].sec = shdr[i].sh_info;
350 rl++;
351 break;
352 case SHT_RELA:
353 ef->relatab[ra].rela = (Elf_Rela *) shdr[i].sh_addr;
354 ef->relatab[ra].nrela =
355 shdr[i].sh_size / sizeof(Elf_Rela);
356 ef->relatab[ra].sec = shdr[i].sh_info;
357 ra++;
358 break;
359 }
360 }
361 if (pb != ef->nprogtab)
362 panic("lost progbits");
363 if (rl != ef->nreltab)
364 panic("lost reltab");
365 if (ra != ef->nrelatab)
366 panic("lost relatab");
367
368 /* Local intra-module relocations */
369 link_elf_obj_reloc_local(lf);
370
371 *result = lf;
372 return (0);
373
374out:
375 /* preload not done this way */
376 linker_file_unload(lf /* , LINKER_UNLOAD_FORCE */ );
377 return (error);
378}
379
380static int
381link_elf_obj_preload_finish(linker_file_t lf)
382{
383 int error;
384
385 error = relocate_file(lf);
386
387 return (error);
388}
389
390static int
391link_elf_obj_load_file(const char *filename, linker_file_t * result)
392{
393 struct nlookupdata nd;
394 struct thread *td = curthread; /* XXX */
395 struct proc *p = td->td_proc;
396 char *pathname;
397 struct vnode *vp;
398 Elf_Ehdr *hdr;
399 Elf_Shdr *shdr;
400 Elf_Sym *es;
401 int nbytes, i, j;
402 vm_offset_t mapbase;
403 size_t mapsize;
404 int error = 0;
405 int resid;
406 elf_file_t ef;
407 linker_file_t lf;
408 int symtabindex;
409 int symstrindex;
410 int shstrindex;
411 int nsym;
412 int pb, rl, ra;
413 int alignmask;
414
25dac377
JT
415 /* XXX Hack for firmware loading where p == NULL */
416 if (p == NULL) {
417 p = &proc0;
418 }
419
28730bd3
SS
420 KKASSERT(p != NULL);
421 if (p->p_ucred == NULL) {
422 kprintf("link_elf_obj_load_file: cannot load '%s' from filesystem"
423 " this early\n", filename);
424 return ENOENT;
425 }
426 shdr = NULL;
427 lf = NULL;
428 mapsize = 0;
429 hdr = NULL;
430 pathname = linker_search_path(filename);
431 if (pathname == NULL)
432 return ENOENT;
433
434 error = nlookup_init(&nd, pathname, UIO_SYSSPACE, NLC_FOLLOW | NLC_LOCKVP);
435 if (error == 0)
436 error = vn_open(&nd, NULL, FREAD, 0);
437 kfree(pathname, M_LINKER);
438 if (error) {
439 nlookup_done(&nd);
440 return error;
441 }
442 vp = nd.nl_open_vp;
443 nd.nl_open_vp = NULL;
444 nlookup_done(&nd);
445
446 /*
447 * Read the elf header from the file.
448 */
449 hdr = kmalloc(sizeof(*hdr), M_LINKER, M_WAITOK);
450 if (hdr == NULL) {
451 error = ENOMEM;
452 goto out;
453 }
454 error = vn_rdwr(UIO_READ, vp, (void *)hdr, sizeof(*hdr), 0,
455 UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
456 if (error)
457 goto out;
458 if (resid != 0) {
459 error = ENOEXEC;
460 goto out;
461 }
462 if (!IS_ELF(*hdr)) {
463 error = ENOEXEC;
464 goto out;
465 }
466
467 if (hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS
468 || hdr->e_ident[EI_DATA] != ELF_TARG_DATA) {
469 link_elf_obj_error(filename, "Unsupported file layout");
470 error = ENOEXEC;
471 goto out;
472 }
473 if (hdr->e_ident[EI_VERSION] != EV_CURRENT
474 || hdr->e_version != EV_CURRENT) {
475 link_elf_obj_error(filename, "Unsupported file version");
476 error = ENOEXEC;
477 goto out;
478 }
479 if (hdr->e_type != ET_REL) {
480 error = ENOSYS;
481 goto out;
482 }
483 if (hdr->e_machine != ELF_TARG_MACH) {
484 link_elf_obj_error(filename, "Unsupported machine");
485 error = ENOEXEC;
486 goto out;
487 }
488
489 ef = kmalloc(sizeof(struct elf_file), M_LINKER, M_WAITOK | M_ZERO);
490 lf = linker_make_file(filename, ef, &link_elf_obj_file_ops);
491 if (lf == NULL) {
492 kfree(ef, M_LINKER);
493 error = ENOMEM;
494 goto out;
495 }
496 ef->nprogtab = 0;
497 ef->e_shdr = 0;
498 ef->nreltab = 0;
499 ef->nrelatab = 0;
500
501 /* Allocate and read in the section header */
502 nbytes = hdr->e_shnum * hdr->e_shentsize;
503 if (nbytes == 0 || hdr->e_shoff == 0 ||
504 hdr->e_shentsize != sizeof(Elf_Shdr)) {
505 error = ENOEXEC;
506 goto out;
507 }
508 shdr = kmalloc(nbytes, M_LINKER, M_WAITOK);
509 if (shdr == NULL) {
510 error = ENOMEM;
511 goto out;
512 }
513 ef->e_shdr = shdr;
514 error = vn_rdwr(UIO_READ, vp, (caddr_t) shdr, nbytes, hdr->e_shoff,
515 UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
516 if (error)
517 goto out;
518 if (resid) {
519 error = ENOEXEC;
520 goto out;
521 }
522 /* Scan the section header for information and table sizing. */
523 nsym = 0;
524 symtabindex = -1;
525 symstrindex = -1;
526 for (i = 0; i < hdr->e_shnum; i++) {
527 switch (shdr[i].sh_type) {
528 case SHT_PROGBITS:
529 case SHT_NOBITS:
530 ef->nprogtab++;
531 break;
532 case SHT_SYMTAB:
533 nsym++;
534 symtabindex = i;
535 symstrindex = shdr[i].sh_link;
536 break;
537 case SHT_REL:
538 ef->nreltab++;
539 break;
540 case SHT_RELA:
541 ef->nrelatab++;
542 break;
543 case SHT_STRTAB:
544 break;
545 }
546 }
547 if (ef->nprogtab == 0) {
548 link_elf_obj_error(filename, "file has no contents");
549 error = ENOEXEC;
550 goto out;
551 }
552 if (nsym != 1) {
553 /* Only allow one symbol table for now */
554 link_elf_obj_error(filename, "file has no valid symbol table");
555 error = ENOEXEC;
556 goto out;
557 }
558 if (symstrindex < 0 || symstrindex > hdr->e_shnum ||
559 shdr[symstrindex].sh_type != SHT_STRTAB) {
560 link_elf_obj_error(filename, "file has invalid symbol strings");
561 error = ENOEXEC;
562 goto out;
563 }
564 /* Allocate space for tracking the load chunks */
565 if (ef->nprogtab != 0)
566 ef->progtab = kmalloc(ef->nprogtab * sizeof(*ef->progtab),
567 M_LINKER, M_WAITOK | M_ZERO);
568 if (ef->nreltab != 0)
569 ef->reltab = kmalloc(ef->nreltab * sizeof(*ef->reltab),
570 M_LINKER, M_WAITOK | M_ZERO);
571 if (ef->nrelatab != 0)
572 ef->relatab = kmalloc(ef->nrelatab * sizeof(*ef->relatab),
573 M_LINKER, M_WAITOK | M_ZERO);
574 if ((ef->nprogtab != 0 && ef->progtab == NULL) ||
575 (ef->nreltab != 0 && ef->reltab == NULL) ||
576 (ef->nrelatab != 0 && ef->relatab == NULL)) {
577 error = ENOMEM;
578 goto out;
579 }
580 if (symtabindex == -1)
581 panic("lost symbol table index");
582 /* Allocate space for and load the symbol table */
583 ef->ddbsymcnt = shdr[symtabindex].sh_size / sizeof(Elf_Sym);
584 ef->ddbsymtab = kmalloc(shdr[symtabindex].sh_size, M_LINKER, M_WAITOK);
585 if (ef->ddbsymtab == NULL) {
586 error = ENOMEM;
587 goto out;
588 }
589 error = vn_rdwr(UIO_READ, vp, (void *)ef->ddbsymtab,
590 shdr[symtabindex].sh_size, shdr[symtabindex].sh_offset,
591 UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
592 if (error)
593 goto out;
594 if (resid != 0) {
595 error = EINVAL;
596 goto out;
597 }
598 if (symstrindex == -1)
599 panic("lost symbol string index");
600 /* Allocate space for and load the symbol strings */
601 ef->ddbstrcnt = shdr[symstrindex].sh_size;
602 ef->ddbstrtab = kmalloc(shdr[symstrindex].sh_size, M_LINKER, M_WAITOK);
603 if (ef->ddbstrtab == NULL) {
604 error = ENOMEM;
605 goto out;
606 }
607 error = vn_rdwr(UIO_READ, vp, ef->ddbstrtab,
608 shdr[symstrindex].sh_size, shdr[symstrindex].sh_offset,
609 UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
610 if (error)
611 goto out;
612 if (resid != 0) {
613 error = EINVAL;
614 goto out;
615 }
616 /* Do we have a string table for the section names? */
617 shstrindex = -1;
618 if (hdr->e_shstrndx != 0 &&
619 shdr[hdr->e_shstrndx].sh_type == SHT_STRTAB) {
620 shstrindex = hdr->e_shstrndx;
621 ef->shstrcnt = shdr[shstrindex].sh_size;
622 ef->shstrtab = kmalloc(shdr[shstrindex].sh_size, M_LINKER,
623 M_WAITOK);
624 if (ef->shstrtab == NULL) {
625 error = ENOMEM;
626 goto out;
627 }
628 error = vn_rdwr(UIO_READ, vp, ef->shstrtab,
629 shdr[shstrindex].sh_size, shdr[shstrindex].sh_offset,
630 UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
631 if (error)
632 goto out;
633 if (resid != 0) {
634 error = EINVAL;
635 goto out;
636 }
637 }
638 /* Size up code/data(progbits) and bss(nobits). */
639 alignmask = 0;
640 for (i = 0; i < hdr->e_shnum; i++) {
641 switch (shdr[i].sh_type) {
642 case SHT_PROGBITS:
643 case SHT_NOBITS:
644 alignmask = shdr[i].sh_addralign - 1;
645 mapsize += alignmask;
646 mapsize &= ~alignmask;
647 mapsize += shdr[i].sh_size;
648 break;
649 }
650 }
651
652 /*
653 * We know how much space we need for the text/data/bss/etc. This
654 * stuff needs to be in a single chunk so that profiling etc can get
655 * the bounds and gdb can associate offsets with modules
656 */
657 ef->object = vm_object_allocate(OBJT_DEFAULT,
658 round_page(mapsize) >> PAGE_SHIFT);
659 if (ef->object == NULL) {
660 error = ENOMEM;
661 goto out;
662 }
663 ef->address = (caddr_t) vm_map_min(&kernel_map);
d63ed24b 664 ef->bytes = 0;
28730bd3
SS
665
666 /*
b2b3ffcd 667 * In order to satisfy x86_64's architectural requirements on the
28730bd3
SS
668 * location of code and data in the kernel's address space, request a
669 * mapping that is above the kernel.
d63ed24b
MD
670 *
671 * vkernel64's text+data is outside the managed VM space entirely.
28730bd3 672 */
d63ed24b
MD
673#if defined(__amd64__) && defined(_KERNEL_VIRTUAL)
674 error = vkernel_module_memory_alloc(&mapbase, round_page(mapsize));
675#else
28730bd3
SS
676 mapbase = KERNBASE;
677 error = vm_map_find(&kernel_map, ef->object, 0, &mapbase,
9388fcaa
MD
678 round_page(mapsize), PAGE_SIZE,
679 TRUE, VM_MAPTYPE_NORMAL,
28730bd3
SS
680 VM_PROT_ALL, VM_PROT_ALL, FALSE);
681 if (error) {
682 vm_object_deallocate(ef->object);
d63ed24b 683 ef->object = NULL;
28730bd3
SS
684 goto out;
685 }
686 /* Wire the pages */
687 error = vm_map_wire(&kernel_map, mapbase,
688 mapbase + round_page(mapsize), 0);
d63ed24b 689#endif
28730bd3
SS
690 if (error != KERN_SUCCESS) {
691 error = ENOMEM;
692 goto out;
693 }
694 /* Inform the kld system about the situation */
695 lf->address = ef->address = (caddr_t) mapbase;
d63ed24b
MD
696 lf->size = round_page(mapsize);
697 ef->bytes = mapsize;
28730bd3
SS
698
699 /*
700 * Now load code/data(progbits), zero bss(nobits), allocate space for
701 * and load relocs
702 */
703 pb = 0;
704 rl = 0;
705 ra = 0;
706 alignmask = 0;
707 for (i = 0; i < hdr->e_shnum; i++) {
708 switch (shdr[i].sh_type) {
709 case SHT_PROGBITS:
710 case SHT_NOBITS:
711 alignmask = shdr[i].sh_addralign - 1;
712 mapbase += alignmask;
713 mapbase &= ~alignmask;
714 if (ef->shstrtab && shdr[i].sh_name != 0)
715 ef->progtab[pb].name =
716 ef->shstrtab + shdr[i].sh_name;
717 else if (shdr[i].sh_type == SHT_PROGBITS)
718 ef->progtab[pb].name = "<<PROGBITS>>";
719 else
720 ef->progtab[pb].name = "<<NOBITS>>";
721#if 0
722 if (ef->progtab[pb].name != NULL &&
723 !strcmp(ef->progtab[pb].name, "set_pcpu"))
724 ef->progtab[pb].addr =
725 dpcpu_alloc(shdr[i].sh_size);
726#ifdef VIMAGE
727 else if (ef->progtab[pb].name != NULL &&
728 !strcmp(ef->progtab[pb].name, VNET_SETNAME))
729 ef->progtab[pb].addr =
730 vnet_data_alloc(shdr[i].sh_size);
731#endif
732 else
733#endif
734 ef->progtab[pb].addr =
735 (void *)(uintptr_t) mapbase;
736 if (ef->progtab[pb].addr == NULL) {
737 error = ENOSPC;
738 goto out;
739 }
740 ef->progtab[pb].size = shdr[i].sh_size;
741 ef->progtab[pb].sec = i;
742 if (shdr[i].sh_type == SHT_PROGBITS) {
743 error = vn_rdwr(UIO_READ, vp,
744 ef->progtab[pb].addr,
745 shdr[i].sh_size, shdr[i].sh_offset,
746 UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred,
747 &resid);
748 if (error)
749 goto out;
750 if (resid != 0) {
751 error = EINVAL;
752 goto out;
753 }
754#if 0
755 /* Initialize the per-cpu or vnet area. */
756 if (ef->progtab[pb].addr != (void *)mapbase &&
757 !strcmp(ef->progtab[pb].name, "set_pcpu"))
758 dpcpu_copy(ef->progtab[pb].addr,
759 shdr[i].sh_size);
760#ifdef VIMAGE
761 else if (ef->progtab[pb].addr !=
762 (void *)mapbase &&
763 !strcmp(ef->progtab[pb].name, VNET_SETNAME))
764 vnet_data_copy(ef->progtab[pb].addr,
765 shdr[i].sh_size);
766#endif
767#endif
768 } else
769 bzero(ef->progtab[pb].addr, shdr[i].sh_size);
770
771 /* Update all symbol values with the offset. */
772 for (j = 0; j < ef->ddbsymcnt; j++) {
773 es = &ef->ddbsymtab[j];
774 if (es->st_shndx != i)
775 continue;
776 es->st_value += (Elf_Addr) ef->progtab[pb].addr;
777 }
778 mapbase += shdr[i].sh_size;
779 pb++;
780 break;
781 case SHT_REL:
782 ef->reltab[rl].rel = kmalloc(shdr[i].sh_size, M_LINKER, M_WAITOK);
783 ef->reltab[rl].nrel = shdr[i].sh_size / sizeof(Elf_Rel);
784 ef->reltab[rl].sec = shdr[i].sh_info;
785 error = vn_rdwr(UIO_READ, vp,
786 (void *)ef->reltab[rl].rel,
787 shdr[i].sh_size, shdr[i].sh_offset,
788 UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
789 if (error)
790 goto out;
791 if (resid != 0) {
792 error = EINVAL;
793 goto out;
794 }
795 rl++;
796 break;
797 case SHT_RELA:
798 ef->relatab[ra].rela = kmalloc(shdr[i].sh_size, M_LINKER, M_WAITOK);
799 ef->relatab[ra].nrela = shdr[i].sh_size / sizeof(Elf_Rela);
800 ef->relatab[ra].sec = shdr[i].sh_info;
801 error = vn_rdwr(UIO_READ, vp,
802 (void *)ef->relatab[ra].rela,
803 shdr[i].sh_size, shdr[i].sh_offset,
804 UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
805 if (error)
806 goto out;
807 if (resid != 0) {
808 error = EINVAL;
809 goto out;
810 }
811 ra++;
812 break;
813 }
814 }
815 if (pb != ef->nprogtab)
816 panic("lost progbits");
817 if (rl != ef->nreltab)
818 panic("lost reltab");
819 if (ra != ef->nrelatab)
820 panic("lost relatab");
821 if (mapbase != (vm_offset_t) ef->address + mapsize)
822 panic("mapbase 0x%lx != address %p + mapsize 0x%lx (0x%lx)\n",
823 mapbase, ef->address, mapsize,
824 (vm_offset_t) ef->address + mapsize);
825
826 /* Local intra-module relocations */
827 link_elf_obj_reloc_local(lf);
828
829 /* Pull in dependencies */
830 error = linker_load_dependencies(lf);
831 if (error)
832 goto out;
833
834 /* External relocations */
835 error = relocate_file(lf);
836 if (error)
837 goto out;
838
839 *result = lf;
840
841out:
842 if (error && lf)
843 linker_file_unload(lf /*, LINKER_UNLOAD_FORCE */);
844 if (hdr)
845 kfree(hdr, M_LINKER);
846 vn_unlock(vp);
847 vn_close(vp, FREAD);
848
849 return error;
850}
851
852static void
853link_elf_obj_unload_file(linker_file_t file)
854{
855 elf_file_t ef = file->priv;
856 int i;
857
858 if (ef->progtab) {
859 for (i = 0; i < ef->nprogtab; i++) {
860 if (ef->progtab[i].size == 0)
861 continue;
862 if (ef->progtab[i].name == NULL)
863 continue;
864#if 0
865 if (!strcmp(ef->progtab[i].name, "set_pcpu"))
866 dpcpu_free(ef->progtab[i].addr,
867 ef->progtab[i].size);
868#ifdef VIMAGE
869 else if (!strcmp(ef->progtab[i].name, VNET_SETNAME))
870 vnet_data_free(ef->progtab[i].addr,
871 ef->progtab[i].size);
872#endif
873#endif
874 }
875 }
876 if (ef->preloaded) {
877 if (ef->reltab)
878 kfree(ef->reltab, M_LINKER);
879 if (ef->relatab)
880 kfree(ef->relatab, M_LINKER);
881 if (ef->progtab)
882 kfree(ef->progtab, M_LINKER);
883 if (ef->ctftab)
884 kfree(ef->ctftab, M_LINKER);
885 if (ef->ctfoff)
886 kfree(ef->ctfoff, M_LINKER);
887 if (ef->typoff)
888 kfree(ef->typoff, M_LINKER);
889 if (file->filename != NULL)
890 preload_delete_name(file->filename);
891 kfree(ef, M_LINKER);
892 /* XXX reclaim module memory? */
893 return;
894 }
895
896 for (i = 0; i < ef->nreltab; i++)
897 if (ef->reltab[i].rel)
898 kfree(ef->reltab[i].rel, M_LINKER);
899 for (i = 0; i < ef->nrelatab; i++)
900 if (ef->relatab[i].rela)
901 kfree(ef->relatab[i].rela, M_LINKER);
902 if (ef->reltab)
903 kfree(ef->reltab, M_LINKER);
904 if (ef->relatab)
905 kfree(ef->relatab, M_LINKER);
906 if (ef->progtab)
907 kfree(ef->progtab, M_LINKER);
908
909 if (ef->object) {
d63ed24b
MD
910#if defined(__amd64__) && defined(_KERNEL_VIRTUAL)
911 vkernel_module_memory_free((vm_offset_t)ef->address, ef->bytes);
912#else
28730bd3
SS
913 vm_map_remove(&kernel_map, (vm_offset_t) ef->address,
914 (vm_offset_t) ef->address +
915 (ef->object->size << PAGE_SHIFT));
d63ed24b
MD
916#endif
917 vm_object_deallocate(ef->object);
918 ef->object = NULL;
28730bd3
SS
919 }
920 if (ef->e_shdr)
921 kfree(ef->e_shdr, M_LINKER);
922 if (ef->ddbsymtab)
923 kfree(ef->ddbsymtab, M_LINKER);
924 if (ef->ddbstrtab)
925 kfree(ef->ddbstrtab, M_LINKER);
926 if (ef->shstrtab)
927 kfree(ef->shstrtab, M_LINKER);
928 if (ef->ctftab)
929 kfree(ef->ctftab, M_LINKER);
930 if (ef->ctfoff)
931 kfree(ef->ctfoff, M_LINKER);
932 if (ef->typoff)
933 kfree(ef->typoff, M_LINKER);
934 kfree(ef, M_LINKER);
935}
936
937static const char *
938symbol_name(elf_file_t ef, Elf_Size r_info)
939{
940 const Elf_Sym *ref;
941
942 if (ELF_R_SYM(r_info)) {
943 ref = ef->ddbsymtab + ELF_R_SYM(r_info);
944 return ef->ddbstrtab + ref->st_name;
945 } else
946 return NULL;
947}
948
949static Elf_Addr
950findbase(elf_file_t ef, int sec)
951{
952 int i;
953 Elf_Addr base = 0;
954
955 for (i = 0; i < ef->nprogtab; i++) {
956 if (sec == ef->progtab[i].sec) {
957 base = (Elf_Addr)ef->progtab[i].addr;
958 break;
959 }
960 }
961 return base;
962}
963
964static int
965relocate_file(linker_file_t lf)
966{
967 elf_file_t ef = lf->priv;
968 const Elf_Rel *rellim;
969 const Elf_Rel *rel;
970 const Elf_Rela *relalim;
971 const Elf_Rela *rela;
972 const char *symname;
973 const Elf_Sym *sym;
974 int i;
975 Elf_Size symidx;
976 Elf_Addr base;
977
978 /* Perform relocations without addend if there are any: */
979 for (i = 0; i < ef->nreltab; i++) {
980 rel = ef->reltab[i].rel;
981 if (rel == NULL)
982 panic("lost a reltab!");
983 rellim = rel + ef->reltab[i].nrel;
984 base = findbase(ef, ef->reltab[i].sec);
985 if (base == 0)
986 panic("lost base for reltab");
987 for ( ; rel < rellim; rel++) {
988 symidx = ELF_R_SYM(rel->r_info);
989 if (symidx >= ef->ddbsymcnt)
990 continue;
991 sym = ef->ddbsymtab + symidx;
992 /* Local relocs are already done */
993 if (ELF_ST_BIND(sym->st_info) == STB_LOCAL)
994 continue;
995 if (elf_reloc(lf, base, rel, ELF_RELOC_REL,
996 elf_obj_lookup)) {
997 symname = symbol_name(ef, rel->r_info);
998 kprintf("link_elf_obj_obj: symbol %s undefined\n",
999 symname);
1000 return ENOENT;
1001 }
1002 }
1003 }
1004
1005 /* Perform relocations with addend if there are any: */
1006 for (i = 0; i < ef->nrelatab; i++) {
1007 rela = ef->relatab[i].rela;
1008 if (rela == NULL)
1009 panic("lost a relatab!");
1010 relalim = rela + ef->relatab[i].nrela;
1011 base = findbase(ef, ef->relatab[i].sec);
1012 if (base == 0)
1013 panic("lost base for relatab");
1014 for ( ; rela < relalim; rela++) {
1015 symidx = ELF_R_SYM(rela->r_info);
1016 if (symidx >= ef->ddbsymcnt)
1017 continue;
1018 sym = ef->ddbsymtab + symidx;
1019 /* Local relocs are already done */
1020 if (ELF_ST_BIND(sym->st_info) == STB_LOCAL)
1021 continue;
1022 if (elf_reloc(lf, base, rela, ELF_RELOC_RELA,
1023 elf_obj_lookup)) {
1024 symname = symbol_name(ef, rela->r_info);
1025 kprintf("link_elf_obj_obj: symbol %s undefined\n",
1026 symname);
1027 return ENOENT;
1028 }
1029 }
1030 }
1031
1032 return 0;
1033}
1034
1035static int
1036link_elf_obj_lookup_symbol(linker_file_t lf, const char *name, c_linker_sym_t *sym)
1037{
1038 elf_file_t ef = lf->priv;
1039 const Elf_Sym *symp;
1040 const char *strp;
1041 int i;
1042
1043 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) {
1044 strp = ef->ddbstrtab + symp->st_name;
1045 if (symp->st_shndx != SHN_UNDEF && strcmp(name, strp) == 0) {
1046 *sym = (c_linker_sym_t) symp;
1047 return 0;
1048 }
1049 }
1050 return ENOENT;
1051}
1052
1053static int
1054link_elf_obj_symbol_values(linker_file_t lf, c_linker_sym_t sym,
1055 linker_symval_t *symval)
1056{
1057 elf_file_t ef = lf->priv;
1058 const Elf_Sym *es = (const Elf_Sym*) sym;
1059
1060 if (es >= ef->ddbsymtab && es < (ef->ddbsymtab + ef->ddbsymcnt)) {
1061 symval->name = ef->ddbstrtab + es->st_name;
1062 symval->value = (caddr_t)es->st_value;
1063 symval->size = es->st_size;
1064 return 0;
1065 }
1066 return ENOENT;
1067}
1068
1069static int
1070link_elf_obj_search_symbol(linker_file_t lf, caddr_t value,
1071 c_linker_sym_t *sym, long *diffp)
1072{
1073 elf_file_t ef = lf->priv;
1074 u_long off = (uintptr_t) (void *) value;
1075 u_long diff = off;
1076 u_long st_value;
1077 const Elf_Sym *es;
1078 const Elf_Sym *best = 0;
1079 int i;
1080
1081 for (i = 0, es = ef->ddbsymtab; i < ef->ddbsymcnt; i++, es++) {
1082 if (es->st_name == 0)
1083 continue;
1084 st_value = es->st_value;
1085 if (off >= st_value) {
1086 if (off - st_value < diff) {
1087 diff = off - st_value;
1088 best = es;
1089 if (diff == 0)
1090 break;
1091 } else if (off - st_value == diff) {
1092 best = es;
1093 }
1094 }
1095 }
1096 if (best == 0)
1097 *diffp = off;
1098 else
1099 *diffp = diff;
1100 *sym = (c_linker_sym_t) best;
1101
1102 return 0;
1103}
1104
1105/*
1106 * Look up a linker set on an ELF system.
1107 */
1108static int
1109link_elf_obj_lookup_set(linker_file_t lf, const char *name,
1110 void ***startp, void ***stopp, int *countp)
1111{
1112 elf_file_t ef = lf->priv;
1113 void **start, **stop;
1114 int i, count;
1115
1116 /* Relative to section number */
1117 for (i = 0; i < ef->nprogtab; i++) {
1118 if ((strncmp(ef->progtab[i].name, "set_", 4) == 0) &&
1119 strcmp(ef->progtab[i].name + 4, name) == 0) {
1120 start = (void **)ef->progtab[i].addr;
1121 stop = (void **)((char *)ef->progtab[i].addr +
1122 ef->progtab[i].size);
1123 count = stop - start;
1124 if (startp)
1125 *startp = start;
1126 if (stopp)
1127 *stopp = stop;
1128 if (countp)
1129 *countp = count;
1130 return (0);
1131 }
1132 }
1133 return (ESRCH);
1134}
1135
1136/*
1137 * Symbol lookup function that can be used when the symbol index is known (ie
1138 * in relocations). It uses the symbol index instead of doing a fully fledged
1139 * hash table based lookup when such is valid. For example for local symbols.
1140 * This is not only more efficient, it's also more correct. It's not always
1141 * the case that the symbol can be found through the hash table.
1142 */
1143static int
1144elf_obj_lookup(linker_file_t lf, Elf_Size symidx, int deps, Elf_Addr *result)
1145{
1146 elf_file_t ef = lf->priv;
1147 const Elf_Sym *sym;
1148 const char *symbol;
1149
1150 /* Don't even try to lookup the symbol if the index is bogus. */
1151 if (symidx >= ef->ddbsymcnt)
1152 return (ENOENT);
1153
1154 sym = ef->ddbsymtab + symidx;
1155
1156 /* Quick answer if there is a definition included. */
1157 if (sym->st_shndx != SHN_UNDEF) {
1158 *result = sym->st_value;
1159 return (0);
1160 }
1161
1162 /* If we get here, then it is undefined and needs a lookup. */
1163 switch (ELF_ST_BIND(sym->st_info)) {
1164 case STB_LOCAL:
1165 /* Local, but undefined? huh? */
1166 return (ENOENT);
1167
1168 case STB_GLOBAL:
1169 /* Relative to Data or Function name */
1170 symbol = ef->ddbstrtab + sym->st_name;
1171
1172 /* Force a lookup failure if the symbol name is bogus. */
1173 if (*symbol == 0)
1174 return (ENOENT);
1175 return (linker_file_lookup_symbol(lf, symbol, deps, (caddr_t *)result));
1176
1177 case STB_WEAK:
1178 kprintf("link_elf_obj_obj: Weak symbols not supported\n");
1179 return (ENOENT);
1180
1181 default:
1182 return (ENOENT);
1183 }
1184}
1185
1186static void
1187link_elf_obj_fix_link_set(elf_file_t ef)
1188{
1189 static const char startn[] = "__start_";
1190 static const char stopn[] = "__stop_";
1191 Elf_Sym *sym;
1192 const char *sym_name, *linkset_name;
1193 Elf_Addr startp, stopp;
1194 Elf_Size symidx;
1195 int start, i;
1196
1197 startp = stopp = 0;
1198 for (symidx = 1 /* zero entry is special */;
1199 symidx < ef->ddbsymcnt; symidx++) {
1200 sym = ef->ddbsymtab + symidx;
1201 if (sym->st_shndx != SHN_UNDEF)
1202 continue;
1203
1204 sym_name = ef->ddbstrtab + sym->st_name;
1205 if (strncmp(sym_name, startn, sizeof(startn) - 1) == 0) {
1206 start = 1;
1207 linkset_name = sym_name + sizeof(startn) - 1;
1208 }
1209 else if (strncmp(sym_name, stopn, sizeof(stopn) - 1) == 0) {
1210 start = 0;
1211 linkset_name = sym_name + sizeof(stopn) - 1;
1212 }
1213 else
1214 continue;
1215
1216 for (i = 0; i < ef->nprogtab; i++) {
1217 if (strcmp(ef->progtab[i].name, linkset_name) == 0) {
1218 startp = (Elf_Addr)ef->progtab[i].addr;
1219 stopp = (Elf_Addr)(startp + ef->progtab[i].size);
1220 break;
1221 }
1222 }
1223 if (i == ef->nprogtab)
1224 continue;
1225
1226 sym->st_value = start ? startp : stopp;
1227 sym->st_shndx = i;
1228 }
1229}
1230
1231static void
1232link_elf_obj_reloc_local(linker_file_t lf)
1233{
1234 elf_file_t ef = lf->priv;
1235 const Elf_Rel *rellim;
1236 const Elf_Rel *rel;
1237 const Elf_Rela *relalim;
1238 const Elf_Rela *rela;
1239 const Elf_Sym *sym;
1240 Elf_Addr base;
1241 int i;
1242 Elf_Size symidx;
1243
1244 link_elf_obj_fix_link_set(ef);
1245
1246 /* Perform relocations without addend if there are any: */
1247 for (i = 0; i < ef->nreltab; i++) {
1248 rel = ef->reltab[i].rel;
1249 if (rel == NULL)
1250 panic("lost a reltab!");
1251 rellim = rel + ef->reltab[i].nrel;
1252 base = findbase(ef, ef->reltab[i].sec);
1253 if (base == 0)
1254 panic("lost base for reltab");
1255 for ( ; rel < rellim; rel++) {
1256 symidx = ELF_R_SYM(rel->r_info);
1257 if (symidx >= ef->ddbsymcnt)
1258 continue;
1259 sym = ef->ddbsymtab + symidx;
1260 /* Only do local relocs */
1261 if (ELF_ST_BIND(sym->st_info) != STB_LOCAL)
1262 continue;
1263 elf_reloc_local(lf, base, rel, ELF_RELOC_REL,
1264 elf_obj_lookup);
1265 }
1266 }
1267
1268 /* Perform relocations with addend if there are any: */
1269 for (i = 0; i < ef->nrelatab; i++) {
1270 rela = ef->relatab[i].rela;
1271 if (rela == NULL)
1272 panic("lost a relatab!");
1273 relalim = rela + ef->relatab[i].nrela;
1274 base = findbase(ef, ef->relatab[i].sec);
1275 if (base == 0)
1276 panic("lost base for relatab");
1277 for ( ; rela < relalim; rela++) {
1278 symidx = ELF_R_SYM(rela->r_info);
1279 if (symidx >= ef->ddbsymcnt)
1280 continue;
1281 sym = ef->ddbsymtab + symidx;
1282 /* Only do local relocs */
1283 if (ELF_ST_BIND(sym->st_info) != STB_LOCAL)
1284 continue;
1285 elf_reloc_local(lf, base, rela, ELF_RELOC_RELA,
1286 elf_obj_lookup);
1287 }
1288 }
1289}