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kernel: Remove some unneeded NULL checks after kmalloc() with M_WAITOK.
[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 $
28730bd3
SS		 28 */
29
30#include <sys/param.h>
31#include <sys/kernel.h>
32#include <sys/systm.h>
33#include <sys/malloc.h>
34#include <sys/proc.h>
35#include <sys/nlookup.h>
36#include <sys/fcntl.h>
37#include <sys/vnode.h>
38#include <sys/linker.h>
39#include <machine/elf.h>
40
41#include <vm/vm.h>
42#include <vm/vm_param.h>
43#include <vm/vm_zone.h>
44#include <vm/vm_object.h>
45#include <vm/vm_kern.h>
46#include <vm/vm_extern.h>
47#include <sys/lock.h>
48#include <vm/pmap.h>
49#include <vm/vm_map.h>
50
51static int link_elf_obj_preload_file(const char *, linker_file_t *);
52static int link_elf_obj_preload_finish(linker_file_t);
53static int link_elf_obj_load_file(const char *, linker_file_t *);
54static int
55link_elf_obj_lookup_symbol(linker_file_t, const char *,
56 c_linker_sym_t *);
57static int link_elf_obj_symbol_values(linker_file_t, c_linker_sym_t, linker_symval_t *);
58static int
59link_elf_obj_search_symbol(linker_file_t, caddr_t value,
60 c_linker_sym_t * sym, long *diffp);
61
62static void link_elf_obj_unload_file(linker_file_t);
63static int
64link_elf_obj_lookup_set(linker_file_t, const char *,
65 void ***, void ***, int *);
66static void link_elf_obj_reloc_local(linker_file_t lf);
67static int elf_obj_lookup(linker_file_t lf, Elf_Size symidx, int deps, Elf_Addr *);
68
69static struct linker_class_ops link_elf_obj_class_ops = {
70 link_elf_obj_load_file,
71 link_elf_obj_preload_file,
72};
73
74static struct linker_file_ops link_elf_obj_file_ops = {
75 .lookup_symbol = link_elf_obj_lookup_symbol,
76 .symbol_values = link_elf_obj_symbol_values,
77 .search_symbol = link_elf_obj_search_symbol,
78 .preload_finish = link_elf_obj_preload_finish,
79 .unload = link_elf_obj_unload_file,
80 .lookup_set = link_elf_obj_lookup_set,
81};
82
83typedef struct {
84 void *addr;
85 Elf_Off size;
86 int flags;
87 int sec; /* Original section */
88 char *name;
89} Elf_progent;
90
91typedef struct {
92 Elf_Rel *rel;
93 int nrel;
94 int sec;
95} Elf_relent;
96
97typedef struct {
98 Elf_Rela *rela;
99 int nrela;
100 int sec;
101} Elf_relaent;
102
103
104typedef struct elf_file {
105 int preloaded;
106
107 caddr_t address; /* Relocation address */
d63ed24b 108 size_t bytes; /* Chunk size in bytes */
28730bd3
SS		 109 vm_object_t object; /* VM object to hold file pages */
110 Elf_Shdr *e_shdr;
111
112 Elf_progent *progtab;
113 int nprogtab;
114
115 Elf_relaent *relatab;
116 int nrelatab;
117
118 Elf_relent *reltab;
119 int nreltab;
120
121 Elf_Sym *ddbsymtab; /* The symbol table we are using */
122 long ddbsymcnt; /* Number of symbols */
123 caddr_t ddbstrtab; /* String table */
124 long ddbstrcnt; /* number of bytes in string table */
125
126 caddr_t shstrtab; /* Section name string table */
127 long shstrcnt; /* number of bytes in string table */
128
129 caddr_t ctftab; /* CTF table */
130 long ctfcnt; /* number of bytes in CTF table */
131 caddr_t ctfoff; /* CTF offset table */
132 caddr_t typoff; /* Type offset table */
133 long typlen; /* Number of type entries. */
134
135} *elf_file_t;
136
137static int relocate_file(linker_file_t lf);
138
139/*
140 * The kernel symbol table starts here.
141 */
142extern struct _dynamic _DYNAMIC;
143
144static void
145link_elf_obj_init(void *arg)
146{
147#if ELF_TARG_CLASS == ELFCLASS32
148 linker_add_class("elf32", NULL, &link_elf_obj_class_ops);
149#else
150 linker_add_class("elf64", NULL, &link_elf_obj_class_ops);
151#endif
152}
153
154SYSINIT(link_elf, SI_BOOT2_KLD, SI_ORDER_SECOND, link_elf_obj_init, 0);
155
156static void
157link_elf_obj_error(const char *file, const char *s)
158{
159 kprintf("kldload: %s: %s\n", file, s);
160}
161
162static int
163link_elf_obj_preload_file(const char *filename, linker_file_t *result)
164{
165 Elf_Ehdr *hdr;
166 Elf_Shdr *shdr;
167 Elf_Sym *es;
168 caddr_t modptr, baseptr, sizeptr;
169 char *type;
170 elf_file_t ef;
171 linker_file_t lf;
172 Elf_Addr off;
173 int error, i, j, pb, ra, rl, shstrindex, symstrindex, symtabindex;
174
175 /*
176 * Look to see if we have the module preloaded.
177 */
178 modptr = preload_search_by_name(filename);
179 if (modptr == NULL)
180 return ENOENT;
181
182 /* It's preloaded, check we can handle it and collect information */
183 type = (char *)preload_search_info(modptr, MODINFO_TYPE);
184 baseptr = preload_search_info(modptr, MODINFO_ADDR);
185 sizeptr = preload_search_info(modptr, MODINFO_SIZE);
186 hdr = (Elf_Ehdr *) preload_search_info(modptr, MODINFO_METADATA |
187 MODINFOMD_ELFHDR);
188 shdr = (Elf_Shdr *) preload_search_info(modptr, MODINFO_METADATA |
189 MODINFOMD_SHDR);
190 if (type == NULL ||
191 (strcmp(type, "elf" __XSTRING(__ELF_WORD_SIZE) " obj module") != 0 &&
192 strcmp(type, "elf obj module") != 0)) {
193 return (EFTYPE);
194 }
195 if (baseptr == NULL || sizeptr == NULL || hdr == NULL || shdr == NULL)
196 return (EINVAL);
197
198 ef = kmalloc(sizeof(struct elf_file), M_LINKER, M_WAITOK | M_ZERO);
199 ef->preloaded = 1;
200 ef->address = *(caddr_t *) baseptr;
d63ed24b 201 ef->bytes = 0;
28730bd3
SS		 202 lf = linker_make_file(filename, ef, &link_elf_obj_file_ops);
203 if (lf == NULL) {
204 kfree(ef, M_LINKER);
205 return ENOMEM;
206 }
207 lf->address = ef->address;
208 lf->size = *(size_t *) sizeptr;
209
210 if (hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS ||
211 hdr->e_ident[EI_DATA] != ELF_TARG_DATA ||
212 hdr->e_ident[EI_VERSION] != EV_CURRENT ||
213 hdr->e_version != EV_CURRENT ||
214 hdr->e_type != ET_REL ||
215 hdr->e_machine != ELF_TARG_MACH) {
216 error = EFTYPE;
217 goto out;
218 }
219 ef->e_shdr = shdr;
220
221 /* Scan the section header for information and table sizing. */
222 symtabindex = -1;
223 symstrindex = -1;
224 for (i = 0; i < hdr->e_shnum; i++) {
225 switch (shdr[i].sh_type) {
226 case SHT_PROGBITS:
227 case SHT_NOBITS:
228 ef->nprogtab++;
229 break;
230 case SHT_SYMTAB:
231 symtabindex = i;
232 symstrindex = shdr[i].sh_link;
233 break;
234 case SHT_REL:
235 ef->nreltab++;
236 break;
237 case SHT_RELA:
238 ef->nrelatab++;
239 break;
240 }
241 }
242
243 shstrindex = hdr->e_shstrndx;
244 if (ef->nprogtab == 0 || symstrindex < 0 ||
245 symstrindex >= hdr->e_shnum ||
246 shdr[symstrindex].sh_type != SHT_STRTAB || shstrindex == 0 ||
247 shstrindex >= hdr->e_shnum ||
248 shdr[shstrindex].sh_type != SHT_STRTAB) {
249 error = ENOEXEC;
250 goto out;
251 }
252 /* Allocate space for tracking the load chunks */
253 if (ef->nprogtab != 0)
254 ef->progtab = kmalloc(ef->nprogtab * sizeof(*ef->progtab),
255 M_LINKER, M_WAITOK | M_ZERO);
256 if (ef->nreltab != 0)
257 ef->reltab = kmalloc(ef->nreltab * sizeof(*ef->reltab),
258 M_LINKER, M_WAITOK | M_ZERO);
259 if (ef->nrelatab != 0)
260 ef->relatab = kmalloc(ef->nrelatab * sizeof(*ef->relatab),
261 M_LINKER, M_WAITOK | M_ZERO);
262 if ((ef->nprogtab != 0 && ef->progtab == NULL) ||
263 (ef->nreltab != 0 && ef->reltab == NULL) ||
264 (ef->nrelatab != 0 && ef->relatab == NULL)) {
265 error = ENOMEM;
266 goto out;
267 }
268 /* XXX, relocate the sh_addr fields saved by the loader. */
269 off = 0;
270 for (i = 0; i < hdr->e_shnum; i++) {
271 if (shdr[i].sh_addr != 0 && (off == 0 || shdr[i].sh_addr < off))
272 off = shdr[i].sh_addr;
273 }
274 for (i = 0; i < hdr->e_shnum; i++) {
275 if (shdr[i].sh_addr != 0)
276 shdr[i].sh_addr = shdr[i].sh_addr - off +
277 (Elf_Addr) ef->address;
278 }
279
280 ef->ddbsymcnt = shdr[symtabindex].sh_size / sizeof(Elf_Sym);
281 ef->ddbsymtab = (Elf_Sym *) shdr[symtabindex].sh_addr;
282 ef->ddbstrcnt = shdr[symstrindex].sh_size;
283 ef->ddbstrtab = (char *)shdr[symstrindex].sh_addr;
284 ef->shstrcnt = shdr[shstrindex].sh_size;
285 ef->shstrtab = (char *)shdr[shstrindex].sh_addr;
286
287 /* Now fill out progtab and the relocation tables. */
288 pb = 0;
289 rl = 0;
290 ra = 0;
291 for (i = 0; i < hdr->e_shnum; i++) {
292 switch (shdr[i].sh_type) {
293 case SHT_PROGBITS:
294 case SHT_NOBITS:
295 ef->progtab[pb].addr = (void *)shdr[i].sh_addr;
296 if (shdr[i].sh_type == SHT_PROGBITS)
297 ef->progtab[pb].name = "<<PROGBITS>>";
298 else
299 ef->progtab[pb].name = "<<NOBITS>>";
300 ef->progtab[pb].size = shdr[i].sh_size;
301 ef->progtab[pb].sec = i;
302 if (ef->shstrtab && shdr[i].sh_name != 0)
303 ef->progtab[pb].name =
304 ef->shstrtab + shdr[i].sh_name;
305#if 0
306 if (ef->progtab[pb].name != NULL &&
307 !strcmp(ef->progtab[pb].name, "set_pcpu")) {
308 void *dpcpu;
309
310 dpcpu = dpcpu_alloc(shdr[i].sh_size);
311 if (dpcpu == NULL) {
312 error = ENOSPC;
313 goto out;
314 }
315 memcpy(dpcpu, ef->progtab[pb].addr,
316 ef->progtab[pb].size);
317 dpcpu_copy(dpcpu, shdr[i].sh_size);
318 ef->progtab[pb].addr = dpcpu;
319#ifdef VIMAGE
320 } else if (ef->progtab[pb].name != NULL &&
321 !strcmp(ef->progtab[pb].name, VNET_SETNAME)) {
322 void *vnet_data;
323
324 vnet_data = vnet_data_alloc(shdr[i].sh_size);
325 if (vnet_data == NULL) {
326 error = ENOSPC;
327 goto out;
328 }
329 memcpy(vnet_data, ef->progtab[pb].addr,
330 ef->progtab[pb].size);
331 vnet_data_copy(vnet_data, shdr[i].sh_size);
332 ef->progtab[pb].addr = vnet_data;
333#endif
334 }
335#endif
336 /* Update all symbol values with the offset. */
337 for (j = 0; j < ef->ddbsymcnt; j++) {
338 es = &ef->ddbsymtab[j];
339 if (es->st_shndx != i)
340 continue;
341 es->st_value += (Elf_Addr) ef->progtab[pb].addr;
342 }
343 pb++;
344 break;
345 case SHT_REL:
346 ef->reltab[rl].rel = (Elf_Rel *) shdr[i].sh_addr;
347 ef->reltab[rl].nrel = shdr[i].sh_size / sizeof(Elf_Rel);
348 ef->reltab[rl].sec = shdr[i].sh_info;
349 rl++;
350 break;
351 case SHT_RELA:
352 ef->relatab[ra].rela = (Elf_Rela *) shdr[i].sh_addr;
353 ef->relatab[ra].nrela =
354 shdr[i].sh_size / sizeof(Elf_Rela);
355 ef->relatab[ra].sec = shdr[i].sh_info;
356 ra++;
357 break;
358 }
359 }
360 if (pb != ef->nprogtab)
361 panic("lost progbits");
362 if (rl != ef->nreltab)
363 panic("lost reltab");
364 if (ra != ef->nrelatab)
365 panic("lost relatab");
366
367 /* Local intra-module relocations */
368 link_elf_obj_reloc_local(lf);
369
370 *result = lf;
371 return (0);
372
373out:
374 /* preload not done this way */
375 linker_file_unload(lf /* , LINKER_UNLOAD_FORCE */ );
376 return (error);
377}
378
379static int
380link_elf_obj_preload_finish(linker_file_t lf)
381{
382 int error;
383
384 error = relocate_file(lf);
385
386 return (error);
387}
388
389static int
390link_elf_obj_load_file(const char *filename, linker_file_t * result)
391{
392 struct nlookupdata nd;
393 struct thread *td = curthread; /* XXX */
394 struct proc *p = td->td_proc;
395 char *pathname;
396 struct vnode *vp;
397 Elf_Ehdr *hdr;
398 Elf_Shdr *shdr;
399 Elf_Sym *es;
400 int nbytes, i, j;
401 vm_offset_t mapbase;
402 size_t mapsize;
403 int error = 0;
404 int resid;
405 elf_file_t ef;
406 linker_file_t lf;
407 int symtabindex;
408 int symstrindex;
409 int shstrindex;
410 int nsym;
411 int pb, rl, ra;
412 int alignmask;
413
25dac377
JT		 414 /* XXX Hack for firmware loading where p == NULL */
415 if (p == NULL) {
416 p = &proc0;
417 }
418
28730bd3
SS		 419 KKASSERT(p != NULL);
420 if (p->p_ucred == NULL) {
421 kprintf("link_elf_obj_load_file: cannot load '%s' from filesystem"
422 " this early\n", filename);
423 return ENOENT;
424 }
425 shdr = NULL;
426 lf = NULL;
427 mapsize = 0;
428 hdr = NULL;
429 pathname = linker_search_path(filename);
430 if (pathname == NULL)
431 return ENOENT;
432
433 error = nlookup_init(&nd, pathname, UIO_SYSSPACE, NLC_FOLLOW | NLC_LOCKVP);
434 if (error == 0)
435 error = vn_open(&nd, NULL, FREAD, 0);
436 kfree(pathname, M_LINKER);
437 if (error) {
438 nlookup_done(&nd);
439 return error;
440 }
441 vp = nd.nl_open_vp;
442 nd.nl_open_vp = NULL;
443 nlookup_done(&nd);
444
445 /*
446 * Read the elf header from the file.
447 */
448 hdr = kmalloc(sizeof(*hdr), M_LINKER, M_WAITOK);
28730bd3
SS		 449 error = vn_rdwr(UIO_READ, vp, (void *)hdr, sizeof(*hdr), 0,
450 UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
451 if (error)
452 goto out;
453 if (resid != 0) {
454 error = ENOEXEC;
455 goto out;
456 }
457 if (!IS_ELF(*hdr)) {
458 error = ENOEXEC;
459 goto out;
460 }
461
462 if (hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS
463 || hdr->e_ident[EI_DATA] != ELF_TARG_DATA) {
464 link_elf_obj_error(filename, "Unsupported file layout");
465 error = ENOEXEC;
466 goto out;
467 }
468 if (hdr->e_ident[EI_VERSION] != EV_CURRENT
469 || hdr->e_version != EV_CURRENT) {
470 link_elf_obj_error(filename, "Unsupported file version");
471 error = ENOEXEC;
472 goto out;
473 }
474 if (hdr->e_type != ET_REL) {
475 error = ENOSYS;
476 goto out;
477 }
478 if (hdr->e_machine != ELF_TARG_MACH) {
479 link_elf_obj_error(filename, "Unsupported machine");
480 error = ENOEXEC;
481 goto out;
482 }
483
484 ef = kmalloc(sizeof(struct elf_file), M_LINKER, M_WAITOK | M_ZERO);
485 lf = linker_make_file(filename, ef, &link_elf_obj_file_ops);
486 if (lf == NULL) {
487 kfree(ef, M_LINKER);
488 error = ENOMEM;
489 goto out;
490 }
491 ef->nprogtab = 0;
492 ef->e_shdr = 0;
493 ef->nreltab = 0;
494 ef->nrelatab = 0;
495
496 /* Allocate and read in the section header */
497 nbytes = hdr->e_shnum * hdr->e_shentsize;
498 if (nbytes == 0 || hdr->e_shoff == 0 ||
499 hdr->e_shentsize != sizeof(Elf_Shdr)) {
500 error = ENOEXEC;
501 goto out;
502 }
503 shdr = kmalloc(nbytes, M_LINKER, M_WAITOK);
28730bd3
SS		 504 ef->e_shdr = shdr;
505 error = vn_rdwr(UIO_READ, vp, (caddr_t) shdr, nbytes, hdr->e_shoff,
506 UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
507 if (error)
508 goto out;
509 if (resid) {
510 error = ENOEXEC;
511 goto out;
512 }
513 /* Scan the section header for information and table sizing. */
514 nsym = 0;
515 symtabindex = -1;
516 symstrindex = -1;
517 for (i = 0; i < hdr->e_shnum; i++) {
518 switch (shdr[i].sh_type) {
519 case SHT_PROGBITS:
520 case SHT_NOBITS:
521 ef->nprogtab++;
522 break;
523 case SHT_SYMTAB:
524 nsym++;
525 symtabindex = i;
526 symstrindex = shdr[i].sh_link;
527 break;
528 case SHT_REL:
529 ef->nreltab++;
530 break;
531 case SHT_RELA:
532 ef->nrelatab++;
533 break;
534 case SHT_STRTAB:
535 break;
536 }
537 }
538 if (ef->nprogtab == 0) {
539 link_elf_obj_error(filename, "file has no contents");
540 error = ENOEXEC;
541 goto out;
542 }
543 if (nsym != 1) {
544 /* Only allow one symbol table for now */
545 link_elf_obj_error(filename, "file has no valid symbol table");
546 error = ENOEXEC;
547 goto out;
548 }
549 if (symstrindex < 0 || symstrindex > hdr->e_shnum ||
550 shdr[symstrindex].sh_type != SHT_STRTAB) {
551 link_elf_obj_error(filename, "file has invalid symbol strings");
552 error = ENOEXEC;
553 goto out;
554 }
555 /* Allocate space for tracking the load chunks */
556 if (ef->nprogtab != 0)
557 ef->progtab = kmalloc(ef->nprogtab * sizeof(*ef->progtab),
558 M_LINKER, M_WAITOK | M_ZERO);
559 if (ef->nreltab != 0)
560 ef->reltab = kmalloc(ef->nreltab * sizeof(*ef->reltab),
561 M_LINKER, M_WAITOK | M_ZERO);
562 if (ef->nrelatab != 0)
563 ef->relatab = kmalloc(ef->nrelatab * sizeof(*ef->relatab),
564 M_LINKER, M_WAITOK | M_ZERO);
565 if ((ef->nprogtab != 0 && ef->progtab == NULL) ||
566 (ef->nreltab != 0 && ef->reltab == NULL) ||
567 (ef->nrelatab != 0 && ef->relatab == NULL)) {
568 error = ENOMEM;
569 goto out;
570 }
571 if (symtabindex == -1)
572 panic("lost symbol table index");
573 /* Allocate space for and load the symbol table */
574 ef->ddbsymcnt = shdr[symtabindex].sh_size / sizeof(Elf_Sym);
575 ef->ddbsymtab = kmalloc(shdr[symtabindex].sh_size, M_LINKER, M_WAITOK);
576 if (ef->ddbsymtab == NULL) {
577 error = ENOMEM;
578 goto out;
579 }
580 error = vn_rdwr(UIO_READ, vp, (void *)ef->ddbsymtab,
581 shdr[symtabindex].sh_size, shdr[symtabindex].sh_offset,
582 UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
583 if (error)
584 goto out;
585 if (resid != 0) {
586 error = EINVAL;
587 goto out;
588 }
589 if (symstrindex == -1)
590 panic("lost symbol string index");
591 /* Allocate space for and load the symbol strings */
592 ef->ddbstrcnt = shdr[symstrindex].sh_size;
593 ef->ddbstrtab = kmalloc(shdr[symstrindex].sh_size, M_LINKER, M_WAITOK);
594 if (ef->ddbstrtab == NULL) {
595 error = ENOMEM;
596 goto out;
597 }
598 error = vn_rdwr(UIO_READ, vp, ef->ddbstrtab,
599 shdr[symstrindex].sh_size, shdr[symstrindex].sh_offset,
600 UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
601 if (error)
602 goto out;
603 if (resid != 0) {
604 error = EINVAL;
605 goto out;
606 }
607 /* Do we have a string table for the section names? */
608 shstrindex = -1;
609 if (hdr->e_shstrndx != 0 &&
610 shdr[hdr->e_shstrndx].sh_type == SHT_STRTAB) {
611 shstrindex = hdr->e_shstrndx;
612 ef->shstrcnt = shdr[shstrindex].sh_size;
613 ef->shstrtab = kmalloc(shdr[shstrindex].sh_size, M_LINKER,
614 M_WAITOK);
615 if (ef->shstrtab == NULL) {
616 error = ENOMEM;
617 goto out;
618 }
619 error = vn_rdwr(UIO_READ, vp, ef->shstrtab,
620 shdr[shstrindex].sh_size, shdr[shstrindex].sh_offset,
621 UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
622 if (error)
623 goto out;
624 if (resid != 0) {
625 error = EINVAL;
626 goto out;
627 }
628 }
629 /* Size up code/data(progbits) and bss(nobits). */
630 alignmask = 0;
631 for (i = 0; i < hdr->e_shnum; i++) {
632 switch (shdr[i].sh_type) {
633 case SHT_PROGBITS:
634 case SHT_NOBITS:
635 alignmask = shdr[i].sh_addralign - 1;
636 mapsize += alignmask;
637 mapsize &= ~alignmask;
638 mapsize += shdr[i].sh_size;
639 break;
640 }
641 }
642
643 /*
644 * We know how much space we need for the text/data/bss/etc. This
645 * stuff needs to be in a single chunk so that profiling etc can get
646 * the bounds and gdb can associate offsets with modules
647 */
648 ef->object = vm_object_allocate(OBJT_DEFAULT,
649 round_page(mapsize) >> PAGE_SHIFT);
650 if (ef->object == NULL) {
651 error = ENOMEM;
652 goto out;
653 }
b12defdc
MD		 654 vm_object_hold(ef->object);
655 vm_object_reference_locked(ef->object);
28730bd3 656 ef->address = (caddr_t) vm_map_min(&kernel_map);
d63ed24b 657 ef->bytes = 0;
28730bd3
SS		 658
659 /*
b2b3ffcd 660 * In order to satisfy x86_64's architectural requirements on the
28730bd3
SS		 661 * location of code and data in the kernel's address space, request a
662 * mapping that is above the kernel.
d63ed24b
MD		 663 *
664 * vkernel64's text+data is outside the managed VM space entirely.
28730bd3 665 */
d63ed24b
MD		 666#if defined(__amd64__) && defined(_KERNEL_VIRTUAL)
667 error = vkernel_module_memory_alloc(&mapbase, round_page(mapsize));
668#else
28730bd3
SS		 669 mapbase = KERNBASE;
670 error = vm_map_find(&kernel_map, ef->object, 0, &mapbase,
9388fcaa
MD		 671 round_page(mapsize), PAGE_SIZE,
672 TRUE, VM_MAPTYPE_NORMAL,
28730bd3 673 VM_PROT_ALL, VM_PROT_ALL, FALSE);
b12defdc 674 vm_object_drop(ef->object);
28730bd3
SS		 675 if (error) {
676 vm_object_deallocate(ef->object);
d63ed24b 677 ef->object = NULL;
28730bd3
SS		 678 goto out;
679 }
680 /* Wire the pages */
681 error = vm_map_wire(&kernel_map, mapbase,
682 mapbase + round_page(mapsize), 0);
d63ed24b 683#endif
28730bd3
SS		 684 if (error != KERN_SUCCESS) {
685 error = ENOMEM;
686 goto out;
687 }
688 /* Inform the kld system about the situation */
689 lf->address = ef->address = (caddr_t) mapbase;
d63ed24b
MD		 690 lf->size = round_page(mapsize);
691 ef->bytes = mapsize;
28730bd3
SS		 692
693 /*
694 * Now load code/data(progbits), zero bss(nobits), allocate space for
695 * and load relocs
696 */
697 pb = 0;
698 rl = 0;
699 ra = 0;
700 alignmask = 0;
701 for (i = 0; i < hdr->e_shnum; i++) {
702 switch (shdr[i].sh_type) {
703 case SHT_PROGBITS:
704 case SHT_NOBITS:
705 alignmask = shdr[i].sh_addralign - 1;
706 mapbase += alignmask;
707 mapbase &= ~alignmask;
708 if (ef->shstrtab && shdr[i].sh_name != 0)
709 ef->progtab[pb].name =
710 ef->shstrtab + shdr[i].sh_name;
711 else if (shdr[i].sh_type == SHT_PROGBITS)
712 ef->progtab[pb].name = "<<PROGBITS>>";
713 else
714 ef->progtab[pb].name = "<<NOBITS>>";
715#if 0
716 if (ef->progtab[pb].name != NULL &&
717 !strcmp(ef->progtab[pb].name, "set_pcpu"))
718 ef->progtab[pb].addr =
719 dpcpu_alloc(shdr[i].sh_size);
720#ifdef VIMAGE
721 else if (ef->progtab[pb].name != NULL &&
722 !strcmp(ef->progtab[pb].name, VNET_SETNAME))
723 ef->progtab[pb].addr =
724 vnet_data_alloc(shdr[i].sh_size);
725#endif
726 else
727#endif
728 ef->progtab[pb].addr =
729 (void *)(uintptr_t) mapbase;
730 if (ef->progtab[pb].addr == NULL) {
731 error = ENOSPC;
732 goto out;
733 }
734 ef->progtab[pb].size = shdr[i].sh_size;
735 ef->progtab[pb].sec = i;
736 if (shdr[i].sh_type == SHT_PROGBITS) {
737 error = vn_rdwr(UIO_READ, vp,
738 ef->progtab[pb].addr,
739 shdr[i].sh_size, shdr[i].sh_offset,
740 UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred,
741 &resid);
742 if (error)
743 goto out;
744 if (resid != 0) {
745 error = EINVAL;
746 goto out;
747 }
748#if 0
749 /* Initialize the per-cpu or vnet area. */
750 if (ef->progtab[pb].addr != (void *)mapbase &&
751 !strcmp(ef->progtab[pb].name, "set_pcpu"))
752 dpcpu_copy(ef->progtab[pb].addr,
753 shdr[i].sh_size);
754#ifdef VIMAGE
755 else if (ef->progtab[pb].addr !=
756 (void *)mapbase &&
757 !strcmp(ef->progtab[pb].name, VNET_SETNAME))
758 vnet_data_copy(ef->progtab[pb].addr,
759 shdr[i].sh_size);
760#endif
761#endif
762 } else
763 bzero(ef->progtab[pb].addr, shdr[i].sh_size);
764
765 /* Update all symbol values with the offset. */
766 for (j = 0; j < ef->ddbsymcnt; j++) {
767 es = &ef->ddbsymtab[j];
768 if (es->st_shndx != i)
769 continue;
770 es->st_value += (Elf_Addr) ef->progtab[pb].addr;
771 }
772 mapbase += shdr[i].sh_size;
773 pb++;
774 break;
775 case SHT_REL:
776 ef->reltab[rl].rel = kmalloc(shdr[i].sh_size, M_LINKER, M_WAITOK);
777 ef->reltab[rl].nrel = shdr[i].sh_size / sizeof(Elf_Rel);
778 ef->reltab[rl].sec = shdr[i].sh_info;
779 error = vn_rdwr(UIO_READ, vp,
780 (void *)ef->reltab[rl].rel,
781 shdr[i].sh_size, shdr[i].sh_offset,
782 UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
783 if (error)
784 goto out;
785 if (resid != 0) {
786 error = EINVAL;
787 goto out;
788 }
789 rl++;
790 break;
791 case SHT_RELA:
792 ef->relatab[ra].rela = kmalloc(shdr[i].sh_size, M_LINKER, M_WAITOK);
793 ef->relatab[ra].nrela = shdr[i].sh_size / sizeof(Elf_Rela);
794 ef->relatab[ra].sec = shdr[i].sh_info;
795 error = vn_rdwr(UIO_READ, vp,
796 (void *)ef->relatab[ra].rela,
797 shdr[i].sh_size, shdr[i].sh_offset,
798 UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
799 if (error)
800 goto out;
801 if (resid != 0) {
802 error = EINVAL;
803 goto out;
804 }
805 ra++;
806 break;
807 }
808 }
809 if (pb != ef->nprogtab)
810 panic("lost progbits");
811 if (rl != ef->nreltab)
812 panic("lost reltab");
813 if (ra != ef->nrelatab)
814 panic("lost relatab");
815 if (mapbase != (vm_offset_t) ef->address + mapsize)
816 panic("mapbase 0x%lx != address %p + mapsize 0x%lx (0x%lx)\n",
817 mapbase, ef->address, mapsize,
818 (vm_offset_t) ef->address + mapsize);
819
820 /* Local intra-module relocations */
821 link_elf_obj_reloc_local(lf);
822
823 /* Pull in dependencies */
824 error = linker_load_dependencies(lf);
825 if (error)
826 goto out;
827
828 /* External relocations */
829 error = relocate_file(lf);
830 if (error)
831 goto out;
832
833 *result = lf;
834
835out:
836 if (error && lf)
837 linker_file_unload(lf /*, LINKER_UNLOAD_FORCE */);
838 if (hdr)
839 kfree(hdr, M_LINKER);
840 vn_unlock(vp);
841 vn_close(vp, FREAD);
842
843 return error;
844}
845
846static void
847link_elf_obj_unload_file(linker_file_t file)
848{
849 elf_file_t ef = file->priv;
850 int i;
851
852 if (ef->progtab) {
853 for (i = 0; i < ef->nprogtab; i++) {
854 if (ef->progtab[i].size == 0)
855 continue;
856 if (ef->progtab[i].name == NULL)
857 continue;
858#if 0
859 if (!strcmp(ef->progtab[i].name, "set_pcpu"))
860 dpcpu_free(ef->progtab[i].addr,
861 ef->progtab[i].size);
862#ifdef VIMAGE
863 else if (!strcmp(ef->progtab[i].name, VNET_SETNAME))
864 vnet_data_free(ef->progtab[i].addr,
865 ef->progtab[i].size);
866#endif
867#endif
868 }
869 }
870 if (ef->preloaded) {
871 if (ef->reltab)
872 kfree(ef->reltab, M_LINKER);
873 if (ef->relatab)
874 kfree(ef->relatab, M_LINKER);
875 if (ef->progtab)
876 kfree(ef->progtab, M_LINKER);
877 if (ef->ctftab)
878 kfree(ef->ctftab, M_LINKER);
879 if (ef->ctfoff)
880 kfree(ef->ctfoff, M_LINKER);
881 if (ef->typoff)
882 kfree(ef->typoff, M_LINKER);
883 if (file->filename != NULL)
884 preload_delete_name(file->filename);
885 kfree(ef, M_LINKER);
886 /* XXX reclaim module memory? */
887 return;
888 }
889
890 for (i = 0; i < ef->nreltab; i++)
891 if (ef->reltab[i].rel)
892 kfree(ef->reltab[i].rel, M_LINKER);
893 for (i = 0; i < ef->nrelatab; i++)
894 if (ef->relatab[i].rela)
895 kfree(ef->relatab[i].rela, M_LINKER);
896 if (ef->reltab)
897 kfree(ef->reltab, M_LINKER);
898 if (ef->relatab)
899 kfree(ef->relatab, M_LINKER);
900 if (ef->progtab)
901 kfree(ef->progtab, M_LINKER);
902
903 if (ef->object) {
d63ed24b
MD		 904#if defined(__amd64__) && defined(_KERNEL_VIRTUAL)
905 vkernel_module_memory_free((vm_offset_t)ef->address, ef->bytes);
906#else
28730bd3
SS		 907 vm_map_remove(&kernel_map, (vm_offset_t) ef->address,
908 (vm_offset_t) ef->address +
909 (ef->object->size << PAGE_SHIFT));
d63ed24b
MD		 910#endif
911 vm_object_deallocate(ef->object);
912 ef->object = NULL;
28730bd3
SS		 913 }
914 if (ef->e_shdr)
915 kfree(ef->e_shdr, M_LINKER);
916 if (ef->ddbsymtab)
917 kfree(ef->ddbsymtab, M_LINKER);
918 if (ef->ddbstrtab)
919 kfree(ef->ddbstrtab, M_LINKER);
920 if (ef->shstrtab)
921 kfree(ef->shstrtab, M_LINKER);
922 if (ef->ctftab)
923 kfree(ef->ctftab, M_LINKER);
924 if (ef->ctfoff)
925 kfree(ef->ctfoff, M_LINKER);
926 if (ef->typoff)
927 kfree(ef->typoff, M_LINKER);
928 kfree(ef, M_LINKER);
929}
930
931static const char *
932symbol_name(elf_file_t ef, Elf_Size r_info)
933{
934 const Elf_Sym *ref;
935
936 if (ELF_R_SYM(r_info)) {
937 ref = ef->ddbsymtab + ELF_R_SYM(r_info);
938 return ef->ddbstrtab + ref->st_name;
939 } else
940 return NULL;
941}
942
943static Elf_Addr
944findbase(elf_file_t ef, int sec)
945{
946 int i;
947 Elf_Addr base = 0;
948
949 for (i = 0; i < ef->nprogtab; i++) {
950 if (sec == ef->progtab[i].sec) {
951 base = (Elf_Addr)ef->progtab[i].addr;
952 break;
953 }
954 }
955 return base;
956}
957
958static int
959relocate_file(linker_file_t lf)
960{
961 elf_file_t ef = lf->priv;
962 const Elf_Rel *rellim;
963 const Elf_Rel *rel;
964 const Elf_Rela *relalim;
965 const Elf_Rela *rela;
966 const char *symname;
967 const Elf_Sym *sym;
968 int i;
969 Elf_Size symidx;
970 Elf_Addr base;
971
972 /* Perform relocations without addend if there are any: */
973 for (i = 0; i < ef->nreltab; i++) {
974 rel = ef->reltab[i].rel;
975 if (rel == NULL)
976 panic("lost a reltab!");
977 rellim = rel + ef->reltab[i].nrel;
978 base = findbase(ef, ef->reltab[i].sec);
979 if (base == 0)
980 panic("lost base for reltab");
981 for ( ; rel < rellim; rel++) {
982 symidx = ELF_R_SYM(rel->r_info);
983 if (symidx >= ef->ddbsymcnt)
984 continue;
985 sym = ef->ddbsymtab + symidx;
986 /* Local relocs are already done */
987 if (ELF_ST_BIND(sym->st_info) == STB_LOCAL)
988 continue;
989 if (elf_reloc(lf, base, rel, ELF_RELOC_REL,
990 elf_obj_lookup)) {
991 symname = symbol_name(ef, rel->r_info);
992 kprintf("link_elf_obj_obj: symbol %s undefined\n",
993 symname);
994 return ENOENT;
995 }
996 }
997 }
998
999 /* Perform relocations with addend if there are any: */
1000 for (i = 0; i < ef->nrelatab; i++) {
1001 rela = ef->relatab[i].rela;
1002 if (rela == NULL)
1003 panic("lost a relatab!");
1004 relalim = rela + ef->relatab[i].nrela;
1005 base = findbase(ef, ef->relatab[i].sec);
1006 if (base == 0)
1007 panic("lost base for relatab");
1008 for ( ; rela < relalim; rela++) {
1009 symidx = ELF_R_SYM(rela->r_info);
1010 if (symidx >= ef->ddbsymcnt)
1011 continue;
1012 sym = ef->ddbsymtab + symidx;
1013 /* Local relocs are already done */
1014 if (ELF_ST_BIND(sym->st_info) == STB_LOCAL)
1015 continue;
1016 if (elf_reloc(lf, base, rela, ELF_RELOC_RELA,
1017 elf_obj_lookup)) {
1018 symname = symbol_name(ef, rela->r_info);
1019 kprintf("link_elf_obj_obj: symbol %s undefined\n",
1020 symname);
1021 return ENOENT;
1022 }
1023 }
1024 }
1025
1026 return 0;
1027}
1028
1029static int
1030link_elf_obj_lookup_symbol(linker_file_t lf, const char *name, c_linker_sym_t *sym)
1031{
1032 elf_file_t ef = lf->priv;
1033 const Elf_Sym *symp;
1034 const char *strp;
1035 int i;
1036
1037 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) {
1038 strp = ef->ddbstrtab + symp->st_name;
1039 if (symp->st_shndx != SHN_UNDEF && strcmp(name, strp) == 0) {
1040 *sym = (c_linker_sym_t) symp;
1041 return 0;
1042 }
1043 }
1044 return ENOENT;
1045}
1046
1047static int
1048link_elf_obj_symbol_values(linker_file_t lf, c_linker_sym_t sym,
1049 linker_symval_t *symval)
1050{
1051 elf_file_t ef = lf->priv;
1052 const Elf_Sym *es = (const Elf_Sym*) sym;
1053
1054 if (es >= ef->ddbsymtab && es < (ef->ddbsymtab + ef->ddbsymcnt)) {
1055 symval->name = ef->ddbstrtab + es->st_name;
1056 symval->value = (caddr_t)es->st_value;
1057 symval->size = es->st_size;
1058 return 0;
1059 }
1060 return ENOENT;
1061}
1062
1063static int
1064link_elf_obj_search_symbol(linker_file_t lf, caddr_t value,
1065 c_linker_sym_t *sym, long *diffp)
1066{
1067 elf_file_t ef = lf->priv;
1068 u_long off = (uintptr_t) (void *) value;
1069 u_long diff = off;
1070 u_long st_value;
1071 const Elf_Sym *es;
1072 const Elf_Sym *best = 0;
1073 int i;
1074
1075 for (i = 0, es = ef->ddbsymtab; i < ef->ddbsymcnt; i++, es++) {
1076 if (es->st_name == 0)
1077 continue;
1078 st_value = es->st_value;
1079 if (off >= st_value) {
1080 if (off - st_value < diff) {
1081 diff = off - st_value;
1082 best = es;
1083 if (diff == 0)
1084 break;
1085 } else if (off - st_value == diff) {
1086 best = es;
1087 }
1088 }
1089 }
1090 if (best == 0)
1091 *diffp = off;
1092 else
1093 *diffp = diff;
1094 *sym = (c_linker_sym_t) best;
1095
1096 return 0;
1097}
1098
1099/*
1100 * Look up a linker set on an ELF system.
1101 */
1102static int
1103link_elf_obj_lookup_set(linker_file_t lf, const char *name,
1104 void ***startp, void ***stopp, int *countp)
1105{
1106 elf_file_t ef = lf->priv;
1107 void **start, **stop;
1108 int i, count;
1109
1110 /* Relative to section number */
1111 for (i = 0; i < ef->nprogtab; i++) {
1112 if ((strncmp(ef->progtab[i].name, "set_", 4) == 0) &&
1113 strcmp(ef->progtab[i].name + 4, name) == 0) {
1114 start = (void **)ef->progtab[i].addr;
1115 stop = (void **)((char *)ef->progtab[i].addr +
1116 ef->progtab[i].size);
1117 count = stop - start;
1118 if (startp)
1119 *startp = start;
1120 if (stopp)
1121 *stopp = stop;
1122 if (countp)
1123 *countp = count;
1124 return (0);
1125 }
1126 }
1127 return (ESRCH);
1128}
1129
1130/*
1131 * Symbol lookup function that can be used when the symbol index is known (ie
1132 * in relocations). It uses the symbol index instead of doing a fully fledged
1133 * hash table based lookup when such is valid. For example for local symbols.
1134 * This is not only more efficient, it's also more correct. It's not always
1135 * the case that the symbol can be found through the hash table.
1136 */
1137static int
1138elf_obj_lookup(linker_file_t lf, Elf_Size symidx, int deps, Elf_Addr *result)
1139{
1140 elf_file_t ef = lf->priv;
1141 const Elf_Sym *sym;
1142 const char *symbol;
1143
1144 /* Don't even try to lookup the symbol if the index is bogus. */
1145 if (symidx >= ef->ddbsymcnt)
1146 return (ENOENT);
1147
1148 sym = ef->ddbsymtab + symidx;
1149
1150 /* Quick answer if there is a definition included. */
1151 if (sym->st_shndx != SHN_UNDEF) {
1152 *result = sym->st_value;
1153 return (0);
1154 }
1155
1156 /* If we get here, then it is undefined and needs a lookup. */
1157 switch (ELF_ST_BIND(sym->st_info)) {
1158 case STB_LOCAL:
1159 /* Local, but undefined? huh? */
1160 return (ENOENT);
1161
1162 case STB_GLOBAL:
1163 /* Relative to Data or Function name */
1164 symbol = ef->ddbstrtab + sym->st_name;
1165
1166 /* Force a lookup failure if the symbol name is bogus. */
1167 if (*symbol == 0)
1168 return (ENOENT);
1169 return (linker_file_lookup_symbol(lf, symbol, deps, (caddr_t *)result));
1170
1171 case STB_WEAK:
1172 kprintf("link_elf_obj_obj: Weak symbols not supported\n");
1173 return (ENOENT);
1174
1175 default:
1176 return (ENOENT);
1177 }
1178}
1179
1180static void
1181link_elf_obj_fix_link_set(elf_file_t ef)
1182{
1183 static const char startn[] = "__start_";
1184 static const char stopn[] = "__stop_";
1185 Elf_Sym *sym;
1186 const char *sym_name, *linkset_name;
1187 Elf_Addr startp, stopp;
1188 Elf_Size symidx;
1189 int start, i;
1190
1191 startp = stopp = 0;
1192 for (symidx = 1 /* zero entry is special */;
1193 symidx < ef->ddbsymcnt; symidx++) {
1194 sym = ef->ddbsymtab + symidx;
1195 if (sym->st_shndx != SHN_UNDEF)
1196 continue;
1197
1198 sym_name = ef->ddbstrtab + sym->st_name;
1199 if (strncmp(sym_name, startn, sizeof(startn) - 1) == 0) {
1200 start = 1;
1201 linkset_name = sym_name + sizeof(startn) - 1;
1202 }
1203 else if (strncmp(sym_name, stopn, sizeof(stopn) - 1) == 0) {
1204 start = 0;
1205 linkset_name = sym_name + sizeof(stopn) - 1;
1206 }
1207 else
1208 continue;
1209
1210 for (i = 0; i < ef->nprogtab; i++) {
1211 if (strcmp(ef->progtab[i].name, linkset_name) == 0) {
1212 startp = (Elf_Addr)ef->progtab[i].addr;
1213 stopp = (Elf_Addr)(startp + ef->progtab[i].size);
1214 break;
1215 }
1216 }
1217 if (i == ef->nprogtab)
1218 continue;
1219
1220 sym->st_value = start ? startp : stopp;
1221 sym->st_shndx = i;
1222 }
1223}
1224
1225static void
1226link_elf_obj_reloc_local(linker_file_t lf)
1227{
1228 elf_file_t ef = lf->priv;
1229 const Elf_Rel *rellim;
1230 const Elf_Rel *rel;
1231 const Elf_Rela *relalim;
1232 const Elf_Rela *rela;
1233 const Elf_Sym *sym;
1234 Elf_Addr base;
1235 int i;
1236 Elf_Size symidx;
1237
1238 link_elf_obj_fix_link_set(ef);
1239
1240 /* Perform relocations without addend if there are any: */
1241 for (i = 0; i < ef->nreltab; i++) {
1242 rel = ef->reltab[i].rel;
1243 if (rel == NULL)
1244 panic("lost a reltab!");
1245 rellim = rel + ef->reltab[i].nrel;
1246 base = findbase(ef, ef->reltab[i].sec);
1247 if (base == 0)
1248 panic("lost base for reltab");
1249 for ( ; rel < rellim; rel++) {
1250 symidx = ELF_R_SYM(rel->r_info);
1251 if (symidx >= ef->ddbsymcnt)
1252 continue;
1253 sym = ef->ddbsymtab + symidx;
1254 /* Only do local relocs */
1255 if (ELF_ST_BIND(sym->st_info) != STB_LOCAL)
1256 continue;
1257 elf_reloc_local(lf, base, rel, ELF_RELOC_REL,
1258 elf_obj_lookup);
1259 }
1260 }
1261
1262 /* Perform relocations with addend if there are any: */
1263 for (i = 0; i < ef->nrelatab; i++) {
1264 rela = ef->relatab[i].rela;
1265 if (rela == NULL)
1266 panic("lost a relatab!");
1267 relalim = rela + ef->relatab[i].nrela;
1268 base = findbase(ef, ef->relatab[i].sec);
1269 if (base == 0)
1270 panic("lost base for relatab");
1271 for ( ; rela < relalim; rela++) {
1272 symidx = ELF_R_SYM(rela->r_info);
1273 if (symidx >= ef->ddbsymcnt)
1274 continue;
1275 sym = ef->ddbsymtab + symidx;
1276 /* Only do local relocs */
1277 if (ELF_ST_BIND(sym->st_info) != STB_LOCAL)
1278 continue;
1279 elf_reloc_local(lf, base, rela, ELF_RELOC_RELA,
1280 elf_obj_lookup);
1281 }
1282 }
1283}
DragonFly Project GIT Source repo