2 * Copyright (c) 1998-2000 Doug Rabson
3 * Copyright (c) 2004 Peter Wemm
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
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.
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
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
33 #include <sys/param.h>
34 #include <sys/systm.h>
35 #include <sys/kernel.h>
37 #include <sys/malloc.h>
38 #include <sys/mutex.h>
39 #include <sys/mount.h>
41 #include <sys/namei.h>
42 #include <sys/fcntl.h>
43 #include <sys/vnode.h>
44 #include <sys/linker.h>
46 #include <machine/elf.h>
50 #include <security/mac/mac_framework.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>
58 #include <vm/vm_map.h>
60 #include <sys/link_elf.h>
66 #include "linker_if.h"
72 int sec; /* Original section */
89 typedef struct elf_file {
90 struct linker_file lf; /* Common fields */
93 caddr_t address; /* Relocation address */
94 vm_object_t object; /* VM object to hold file pages */
100 Elf_relaent *relatab;
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 */
111 caddr_t shstrtab; /* Section name string table */
112 long shstrcnt; /* number of bytes in string table */
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. */
122 #include <kern/kern_ctf.c>
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 *,
130 static int link_elf_symbol_values(linker_file_t, c_linker_sym_t,
132 static int link_elf_search_symbol(linker_file_t, caddr_t value,
133 c_linker_sym_t *sym, long *diffp);
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,
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 *);
147 static Elf_Addr elf_obj_lookup(linker_file_t lf, Elf_Size symidx, int deps);
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),
166 static struct linker_class link_elf_class = {
167 #if ELF_TARG_CLASS == ELFCLASS32
172 link_elf_methods, sizeof(struct elf_file)
175 static int relocate_file(elf_file_t ef);
178 link_elf_error(const char *filename, const char *s)
180 if (filename == NULL)
181 printf("kldload: %s\n", s);
183 printf("kldload: %s: %s\n", filename, s);
187 link_elf_init(void *arg)
190 linker_add_class(&link_elf_class);
193 SYSINIT(link_elf_obj, SI_SUB_KLD, SI_ORDER_SECOND, link_elf_init, 0);
196 link_elf_link_preload(linker_class_t cls, const char *filename,
197 linker_file_t *result)
202 void *modptr, *baseptr, *sizeptr;
207 int error, i, j, pb, ra, rl, shstrindex, symstrindex, symtabindex;
209 /* Look to see if we have the file preloaded */
210 modptr = preload_search_by_name(filename);
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 |
219 shdr = (Elf_Shdr *)preload_search_info(modptr, MODINFO_METADATA |
221 if (type == NULL || (strcmp(type, "elf" __XSTRING(__ELF_WORD_SIZE)
222 " obj module") != 0 &&
223 strcmp(type, "elf obj module") != 0)) {
226 if (baseptr == NULL || sizeptr == NULL || hdr == NULL ||
230 lf = linker_make_file(filename, &link_elf_class);
236 ef->address = *(caddr_t *)baseptr;
237 lf->address = *(caddr_t *)baseptr;
238 lf->size = *(size_t *)sizeptr;
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) {
251 /* Scan the section header for information and table sizing. */
254 for (i = 0; i < hdr->e_shnum; i++) {
255 switch (shdr[i].sh_type) {
262 symstrindex = shdr[i].sh_link;
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);
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)) {
301 /* XXX, relocate the sh_addr fields saved by the loader. */
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;
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;
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;
320 /* Now fill out progtab and the relocation tables. */
324 for (i = 0; i < hdr->e_shnum; i++) {
325 switch (shdr[i].sh_type) {
328 ef->progtab[pb].addr = (void *)shdr[i].sh_addr;
329 if (shdr[i].sh_type == SHT_PROGBITS)
330 ef->progtab[pb].name = "<<PROGBITS>>";
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")) {
342 dpcpu = dpcpu_alloc(shdr[i].sh_size);
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;
352 } else if (ef->progtab[pb].name != NULL &&
353 !strcmp(ef->progtab[pb].name, VNET_SETNAME)) {
356 vnet_data = vnet_data_alloc(shdr[i].sh_size);
357 if (vnet_data == NULL) {
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;
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)
373 es->st_value += (Elf_Addr)ef->progtab[pb].addr;
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;
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;
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");
399 /* Local intra-module relocations */
400 link_elf_reloc_local(lf);
406 /* preload not done this way */
407 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
412 link_elf_link_preload_finish(linker_file_t lf)
418 error = relocate_file(ef);
422 /* Notify MD code that a module is being loaded. */
423 error = elf_cpu_load_file(lf);
431 link_elf_load_file(linker_class_t cls, const char *filename,
432 linker_file_t *result)
435 struct thread *td = curthread; /* XXX */
459 NDINIT(&nd, LOOKUP, FOLLOW | MPSAFE, UIO_SYSSPACE, filename, td);
461 error = vn_open(&nd, &flags, 0, NULL);
464 vfslocked = NDHASGIANT(&nd);
465 NDFREE(&nd, NDF_ONLY_PNBUF);
466 if (nd.ni_vp->v_type != VREG) {
471 error = mac_kld_check_load(td->td_ucred, nd.ni_vp);
477 /* Read the elf header from the file. */
478 hdr = malloc(sizeof(*hdr), M_LINKER, M_WAITOK);
483 error = vn_rdwr(UIO_READ, nd.ni_vp, (void *)hdr, sizeof(*hdr), 0,
484 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
498 if (hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS
499 || hdr->e_ident[EI_DATA] != ELF_TARG_DATA) {
500 link_elf_error(filename, "Unsupported file layout");
504 if (hdr->e_ident[EI_VERSION] != EV_CURRENT
505 || hdr->e_version != EV_CURRENT) {
506 link_elf_error(filename, "Unsupported file version");
510 if (hdr->e_type != ET_REL) {
514 if (hdr->e_machine != ELF_TARG_MACH) {
515 link_elf_error(filename, "Unsupported machine");
520 lf = linker_make_file(filename, &link_elf_class);
525 ef = (elf_file_t) lf;
531 /* Allocate and read in the section header */
532 nbytes = hdr->e_shnum * hdr->e_shentsize;
533 if (nbytes == 0 || hdr->e_shoff == 0 ||
534 hdr->e_shentsize != sizeof(Elf_Shdr)) {
538 shdr = malloc(nbytes, M_LINKER, M_WAITOK);
544 error = vn_rdwr(UIO_READ, nd.ni_vp, (caddr_t)shdr, nbytes, hdr->e_shoff,
545 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, &resid, td);
553 /* Scan the section header for information and table sizing. */
557 for (i = 0; i < hdr->e_shnum; i++) {
558 switch (shdr[i].sh_type) {
566 symstrindex = shdr[i].sh_link;
578 if (ef->nprogtab == 0) {
579 link_elf_error(filename, "file has no contents");
584 /* Only allow one symbol table for now */
585 link_elf_error(filename, "file has no valid symbol table");
589 if (symstrindex < 0 || symstrindex > hdr->e_shnum ||
590 shdr[symstrindex].sh_type != SHT_STRTAB) {
591 link_elf_error(filename, "file has invalid symbol strings");
596 /* Allocate space for tracking the load chunks */
597 if (ef->nprogtab != 0)
598 ef->progtab = malloc(ef->nprogtab * sizeof(*ef->progtab),
599 M_LINKER, M_WAITOK | M_ZERO);
600 if (ef->nreltab != 0)
601 ef->reltab = malloc(ef->nreltab * sizeof(*ef->reltab),
602 M_LINKER, M_WAITOK | M_ZERO);
603 if (ef->nrelatab != 0)
604 ef->relatab = malloc(ef->nrelatab * sizeof(*ef->relatab),
605 M_LINKER, M_WAITOK | M_ZERO);
606 if ((ef->nprogtab != 0 && ef->progtab == NULL) ||
607 (ef->nreltab != 0 && ef->reltab == NULL) ||
608 (ef->nrelatab != 0 && ef->relatab == NULL)) {
613 if (symtabindex == -1)
614 panic("lost symbol table index");
615 /* Allocate space for and load the symbol table */
616 ef->ddbsymcnt = shdr[symtabindex].sh_size / sizeof(Elf_Sym);
617 ef->ddbsymtab = malloc(shdr[symtabindex].sh_size, M_LINKER, M_WAITOK);
618 if (ef->ddbsymtab == NULL) {
622 error = vn_rdwr(UIO_READ, nd.ni_vp, (void *)ef->ddbsymtab,
623 shdr[symtabindex].sh_size, shdr[symtabindex].sh_offset,
624 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
633 if (symstrindex == -1)
634 panic("lost symbol string index");
635 /* Allocate space for and load the symbol strings */
636 ef->ddbstrcnt = shdr[symstrindex].sh_size;
637 ef->ddbstrtab = malloc(shdr[symstrindex].sh_size, M_LINKER, M_WAITOK);
638 if (ef->ddbstrtab == NULL) {
642 error = vn_rdwr(UIO_READ, nd.ni_vp, ef->ddbstrtab,
643 shdr[symstrindex].sh_size, shdr[symstrindex].sh_offset,
644 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
653 /* Do we have a string table for the section names? */
655 if (hdr->e_shstrndx != 0 &&
656 shdr[hdr->e_shstrndx].sh_type == SHT_STRTAB) {
657 shstrindex = hdr->e_shstrndx;
658 ef->shstrcnt = shdr[shstrindex].sh_size;
659 ef->shstrtab = malloc(shdr[shstrindex].sh_size, M_LINKER,
661 if (ef->shstrtab == NULL) {
665 error = vn_rdwr(UIO_READ, nd.ni_vp, ef->shstrtab,
666 shdr[shstrindex].sh_size, shdr[shstrindex].sh_offset,
667 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
677 /* Size up code/data(progbits) and bss(nobits). */
679 for (i = 0; i < hdr->e_shnum; i++) {
680 switch (shdr[i].sh_type) {
683 alignmask = shdr[i].sh_addralign - 1;
684 mapsize += alignmask;
685 mapsize &= ~alignmask;
686 mapsize += shdr[i].sh_size;
692 * We know how much space we need for the text/data/bss/etc.
693 * This stuff needs to be in a single chunk so that profiling etc
694 * can get the bounds and gdb can associate offsets with modules
696 ef->object = vm_object_allocate(OBJT_DEFAULT,
697 round_page(mapsize) >> PAGE_SHIFT);
698 if (ef->object == NULL) {
702 ef->address = (caddr_t) vm_map_min(kernel_map);
705 * In order to satisfy amd64's architectural requirements on the
706 * location of code and data in the kernel's address space, request a
707 * mapping that is above the kernel.
710 error = vm_map_find(kernel_map, ef->object, 0, &mapbase,
711 round_page(mapsize), TRUE, VM_PROT_ALL, VM_PROT_ALL, FALSE);
713 vm_object_deallocate(ef->object);
719 error = vm_map_wire(kernel_map, mapbase,
720 mapbase + round_page(mapsize),
721 VM_MAP_WIRE_SYSTEM|VM_MAP_WIRE_NOHOLES);
722 if (error != KERN_SUCCESS) {
727 /* Inform the kld system about the situation */
728 lf->address = ef->address = (caddr_t)mapbase;
732 * Now load code/data(progbits), zero bss(nobits), allocate space for
739 for (i = 0; i < hdr->e_shnum; i++) {
740 switch (shdr[i].sh_type) {
743 alignmask = shdr[i].sh_addralign - 1;
744 mapbase += alignmask;
745 mapbase &= ~alignmask;
746 if (ef->shstrtab && shdr[i].sh_name != 0)
747 ef->progtab[pb].name =
748 ef->shstrtab + shdr[i].sh_name;
749 else if (shdr[i].sh_type == SHT_PROGBITS)
750 ef->progtab[pb].name = "<<PROGBITS>>";
752 ef->progtab[pb].name = "<<NOBITS>>";
753 if (ef->progtab[pb].name != NULL &&
754 !strcmp(ef->progtab[pb].name, "set_pcpu"))
755 ef->progtab[pb].addr =
756 dpcpu_alloc(shdr[i].sh_size);
758 else if (ef->progtab[pb].name != NULL &&
759 !strcmp(ef->progtab[pb].name, VNET_SETNAME))
760 ef->progtab[pb].addr =
761 vnet_data_alloc(shdr[i].sh_size);
764 ef->progtab[pb].addr =
765 (void *)(uintptr_t)mapbase;
766 if (ef->progtab[pb].addr == NULL) {
770 ef->progtab[pb].size = shdr[i].sh_size;
771 ef->progtab[pb].sec = i;
772 if (shdr[i].sh_type == SHT_PROGBITS) {
773 error = vn_rdwr(UIO_READ, nd.ni_vp,
774 ef->progtab[pb].addr,
775 shdr[i].sh_size, shdr[i].sh_offset,
776 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred,
784 /* Initialize the per-cpu or vnet area. */
785 if (ef->progtab[pb].addr != (void *)mapbase &&
786 !strcmp(ef->progtab[pb].name, "set_pcpu"))
787 dpcpu_copy(ef->progtab[pb].addr,
790 else if (ef->progtab[pb].addr !=
792 !strcmp(ef->progtab[pb].name, VNET_SETNAME))
793 vnet_data_copy(ef->progtab[pb].addr,
797 bzero(ef->progtab[pb].addr, shdr[i].sh_size);
799 /* Update all symbol values with the offset. */
800 for (j = 0; j < ef->ddbsymcnt; j++) {
801 es = &ef->ddbsymtab[j];
802 if (es->st_shndx != i)
804 es->st_value += (Elf_Addr)ef->progtab[pb].addr;
806 mapbase += shdr[i].sh_size;
810 ef->reltab[rl].rel = malloc(shdr[i].sh_size, M_LINKER,
812 ef->reltab[rl].nrel = shdr[i].sh_size / sizeof(Elf_Rel);
813 ef->reltab[rl].sec = shdr[i].sh_info;
814 error = vn_rdwr(UIO_READ, nd.ni_vp,
815 (void *)ef->reltab[rl].rel,
816 shdr[i].sh_size, shdr[i].sh_offset,
817 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
828 ef->relatab[ra].rela = malloc(shdr[i].sh_size, M_LINKER,
830 ef->relatab[ra].nrela =
831 shdr[i].sh_size / sizeof(Elf_Rela);
832 ef->relatab[ra].sec = shdr[i].sh_info;
833 error = vn_rdwr(UIO_READ, nd.ni_vp,
834 (void *)ef->relatab[ra].rela,
835 shdr[i].sh_size, shdr[i].sh_offset,
836 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
848 if (pb != ef->nprogtab)
849 panic("lost progbits");
850 if (rl != ef->nreltab)
851 panic("lost reltab");
852 if (ra != ef->nrelatab)
853 panic("lost relatab");
854 if (mapbase != (vm_offset_t)ef->address + mapsize)
855 panic("mapbase 0x%lx != address %p + mapsize 0x%lx (0x%lx)\n",
856 mapbase, ef->address, mapsize,
857 (vm_offset_t)ef->address + mapsize);
859 /* Local intra-module relocations */
860 link_elf_reloc_local(lf);
862 /* Pull in dependencies */
863 VOP_UNLOCK(nd.ni_vp, 0);
864 error = linker_load_dependencies(lf);
865 vn_lock(nd.ni_vp, LK_EXCLUSIVE | LK_RETRY);
869 /* External relocations */
870 error = relocate_file(ef);
874 /* Notify MD code that a module is being loaded. */
875 error = elf_cpu_load_file(lf);
883 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
886 VOP_UNLOCK(nd.ni_vp, 0);
887 vn_close(nd.ni_vp, FREAD, td->td_ucred, td);
888 VFS_UNLOCK_GIANT(vfslocked);
894 link_elf_unload_file(linker_file_t file)
896 elf_file_t ef = (elf_file_t) file;
899 /* Notify MD code that a module is being unloaded. */
900 elf_cpu_unload_file(file);
903 for (i = 0; i < ef->nprogtab; i++) {
904 if (ef->progtab[i].size == 0)
906 if (ef->progtab[i].name == NULL)
908 if (!strcmp(ef->progtab[i].name, "set_pcpu"))
909 dpcpu_free(ef->progtab[i].addr,
910 ef->progtab[i].size);
912 else if (!strcmp(ef->progtab[i].name, VNET_SETNAME))
913 vnet_data_free(ef->progtab[i].addr,
914 ef->progtab[i].size);
920 free(ef->reltab, M_LINKER);
922 free(ef->relatab, M_LINKER);
924 free(ef->progtab, M_LINKER);
926 free(ef->ctftab, M_LINKER);
928 free(ef->ctfoff, M_LINKER);
930 free(ef->typoff, M_LINKER);
931 if (file->filename != NULL)
932 preload_delete_name(file->filename);
933 /* XXX reclaim module memory? */
937 for (i = 0; i < ef->nreltab; i++)
938 if (ef->reltab[i].rel)
939 free(ef->reltab[i].rel, M_LINKER);
940 for (i = 0; i < ef->nrelatab; i++)
941 if (ef->relatab[i].rela)
942 free(ef->relatab[i].rela, M_LINKER);
944 free(ef->reltab, M_LINKER);
946 free(ef->relatab, M_LINKER);
948 free(ef->progtab, M_LINKER);
951 vm_map_remove(kernel_map, (vm_offset_t) ef->address,
952 (vm_offset_t) ef->address +
953 (ef->object->size << PAGE_SHIFT));
956 free(ef->e_shdr, M_LINKER);
958 free(ef->ddbsymtab, M_LINKER);
960 free(ef->ddbstrtab, M_LINKER);
962 free(ef->shstrtab, M_LINKER);
964 free(ef->ctftab, M_LINKER);
966 free(ef->ctfoff, M_LINKER);
968 free(ef->typoff, M_LINKER);
972 symbol_name(elf_file_t ef, Elf_Size r_info)
976 if (ELF_R_SYM(r_info)) {
977 ref = ef->ddbsymtab + ELF_R_SYM(r_info);
978 return ef->ddbstrtab + ref->st_name;
984 findbase(elf_file_t ef, int sec)
989 for (i = 0; i < ef->nprogtab; i++) {
990 if (sec == ef->progtab[i].sec) {
991 base = (Elf_Addr)ef->progtab[i].addr;
999 relocate_file(elf_file_t ef)
1001 const Elf_Rel *rellim;
1003 const Elf_Rela *relalim;
1004 const Elf_Rela *rela;
1005 const char *symname;
1012 /* Perform relocations without addend if there are any: */
1013 for (i = 0; i < ef->nreltab; i++) {
1014 rel = ef->reltab[i].rel;
1016 panic("lost a reltab!");
1017 rellim = rel + ef->reltab[i].nrel;
1018 base = findbase(ef, ef->reltab[i].sec);
1020 panic("lost base for reltab");
1021 for ( ; rel < rellim; rel++) {
1022 symidx = ELF_R_SYM(rel->r_info);
1023 if (symidx >= ef->ddbsymcnt)
1025 sym = ef->ddbsymtab + symidx;
1026 /* Local relocs are already done */
1027 if (ELF_ST_BIND(sym->st_info) == STB_LOCAL)
1029 if (elf_reloc(&ef->lf, base, rel, ELF_RELOC_REL,
1031 symname = symbol_name(ef, rel->r_info);
1032 printf("link_elf_obj: symbol %s undefined\n",
1039 /* Perform relocations with addend if there are any: */
1040 for (i = 0; i < ef->nrelatab; i++) {
1041 rela = ef->relatab[i].rela;
1043 panic("lost a relatab!");
1044 relalim = rela + ef->relatab[i].nrela;
1045 base = findbase(ef, ef->relatab[i].sec);
1047 panic("lost base for relatab");
1048 for ( ; rela < relalim; rela++) {
1049 symidx = ELF_R_SYM(rela->r_info);
1050 if (symidx >= ef->ddbsymcnt)
1052 sym = ef->ddbsymtab + symidx;
1053 /* Local relocs are already done */
1054 if (ELF_ST_BIND(sym->st_info) == STB_LOCAL)
1056 if (elf_reloc(&ef->lf, base, rela, ELF_RELOC_RELA,
1058 symname = symbol_name(ef, rela->r_info);
1059 printf("link_elf_obj: symbol %s undefined\n",
1070 link_elf_lookup_symbol(linker_file_t lf, const char *name, c_linker_sym_t *sym)
1072 elf_file_t ef = (elf_file_t) lf;
1073 const Elf_Sym *symp;
1077 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) {
1078 strp = ef->ddbstrtab + symp->st_name;
1079 if (symp->st_shndx != SHN_UNDEF && strcmp(name, strp) == 0) {
1080 *sym = (c_linker_sym_t) symp;
1088 link_elf_symbol_values(linker_file_t lf, c_linker_sym_t sym,
1089 linker_symval_t *symval)
1091 elf_file_t ef = (elf_file_t) lf;
1092 const Elf_Sym *es = (const Elf_Sym*) sym;
1094 if (es >= ef->ddbsymtab && es < (ef->ddbsymtab + ef->ddbsymcnt)) {
1095 symval->name = ef->ddbstrtab + es->st_name;
1096 symval->value = (caddr_t)es->st_value;
1097 symval->size = es->st_size;
1104 link_elf_search_symbol(linker_file_t lf, caddr_t value,
1105 c_linker_sym_t *sym, long *diffp)
1107 elf_file_t ef = (elf_file_t) lf;
1108 u_long off = (uintptr_t) (void *) value;
1112 const Elf_Sym *best = 0;
1115 for (i = 0, es = ef->ddbsymtab; i < ef->ddbsymcnt; i++, es++) {
1116 if (es->st_name == 0)
1118 st_value = es->st_value;
1119 if (off >= st_value) {
1120 if (off - st_value < diff) {
1121 diff = off - st_value;
1125 } else if (off - st_value == diff) {
1134 *sym = (c_linker_sym_t) best;
1140 * Look up a linker set on an ELF system.
1143 link_elf_lookup_set(linker_file_t lf, const char *name,
1144 void ***startp, void ***stopp, int *countp)
1146 elf_file_t ef = (elf_file_t)lf;
1147 void **start, **stop;
1150 /* Relative to section number */
1151 for (i = 0; i < ef->nprogtab; i++) {
1152 if ((strncmp(ef->progtab[i].name, "set_", 4) == 0) &&
1153 strcmp(ef->progtab[i].name + 4, name) == 0) {
1154 start = (void **)ef->progtab[i].addr;
1155 stop = (void **)((char *)ef->progtab[i].addr +
1156 ef->progtab[i].size);
1157 count = stop - start;
1171 link_elf_each_function_name(linker_file_t file,
1172 int (*callback)(const char *, void *), void *opaque)
1174 elf_file_t ef = (elf_file_t)file;
1175 const Elf_Sym *symp;
1178 /* Exhaustive search */
1179 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) {
1180 if (symp->st_value != 0 &&
1181 ELF_ST_TYPE(symp->st_info) == STT_FUNC) {
1182 error = callback(ef->ddbstrtab + symp->st_name, opaque);
1191 link_elf_each_function_nameval(linker_file_t file,
1192 linker_function_nameval_callback_t callback, void *opaque)
1194 linker_symval_t symval;
1195 elf_file_t ef = (elf_file_t)file;
1196 const Elf_Sym* symp;
1199 /* Exhaustive search */
1200 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) {
1201 if (symp->st_value != 0 &&
1202 ELF_ST_TYPE(symp->st_info) == STT_FUNC) {
1203 error = link_elf_symbol_values(file, (c_linker_sym_t) symp, &symval);
1206 error = callback(file, i, &symval, opaque);
1215 * Symbol lookup function that can be used when the symbol index is known (ie
1216 * in relocations). It uses the symbol index instead of doing a fully fledged
1217 * hash table based lookup when such is valid. For example for local symbols.
1218 * This is not only more efficient, it's also more correct. It's not always
1219 * the case that the symbol can be found through the hash table.
1222 elf_obj_lookup(linker_file_t lf, Elf_Size symidx, int deps)
1224 elf_file_t ef = (elf_file_t)lf;
1229 /* Don't even try to lookup the symbol if the index is bogus. */
1230 if (symidx >= ef->ddbsymcnt)
1233 sym = ef->ddbsymtab + symidx;
1235 /* Quick answer if there is a definition included. */
1236 if (sym->st_shndx != SHN_UNDEF)
1237 return (sym->st_value);
1239 /* If we get here, then it is undefined and needs a lookup. */
1240 switch (ELF_ST_BIND(sym->st_info)) {
1242 /* Local, but undefined? huh? */
1246 /* Relative to Data or Function name */
1247 symbol = ef->ddbstrtab + sym->st_name;
1249 /* Force a lookup failure if the symbol name is bogus. */
1252 ret = ((Elf_Addr)linker_file_lookup_symbol(lf, symbol, deps));
1256 printf("link_elf_obj: Weak symbols not supported\n");
1265 link_elf_fix_link_set(elf_file_t ef)
1267 static const char startn[] = "__start_";
1268 static const char stopn[] = "__stop_";
1270 const char *sym_name, *linkset_name;
1271 Elf_Addr startp, stopp;
1276 for (symidx = 1 /* zero entry is special */;
1277 symidx < ef->ddbsymcnt; symidx++) {
1278 sym = ef->ddbsymtab + symidx;
1279 if (sym->st_shndx != SHN_UNDEF)
1282 sym_name = ef->ddbstrtab + sym->st_name;
1283 if (strncmp(sym_name, startn, sizeof(startn) - 1) == 0) {
1285 linkset_name = sym_name + sizeof(startn) - 1;
1287 else if (strncmp(sym_name, stopn, sizeof(stopn) - 1) == 0) {
1289 linkset_name = sym_name + sizeof(stopn) - 1;
1294 for (i = 0; i < ef->nprogtab; i++) {
1295 if (strcmp(ef->progtab[i].name, linkset_name) == 0) {
1296 startp = (Elf_Addr)ef->progtab[i].addr;
1297 stopp = (Elf_Addr)(startp + ef->progtab[i].size);
1301 if (i == ef->nprogtab)
1304 sym->st_value = start ? startp : stopp;
1310 link_elf_reloc_local(linker_file_t lf)
1312 elf_file_t ef = (elf_file_t)lf;
1313 const Elf_Rel *rellim;
1315 const Elf_Rela *relalim;
1316 const Elf_Rela *rela;
1322 link_elf_fix_link_set(ef);
1324 /* Perform relocations without addend if there are any: */
1325 for (i = 0; i < ef->nreltab; i++) {
1326 rel = ef->reltab[i].rel;
1328 panic("lost a reltab!");
1329 rellim = rel + ef->reltab[i].nrel;
1330 base = findbase(ef, ef->reltab[i].sec);
1332 panic("lost base for reltab");
1333 for ( ; rel < rellim; rel++) {
1334 symidx = ELF_R_SYM(rel->r_info);
1335 if (symidx >= ef->ddbsymcnt)
1337 sym = ef->ddbsymtab + symidx;
1338 /* Only do local relocs */
1339 if (ELF_ST_BIND(sym->st_info) != STB_LOCAL)
1341 elf_reloc_local(lf, base, rel, ELF_RELOC_REL,
1346 /* Perform relocations with addend if there are any: */
1347 for (i = 0; i < ef->nrelatab; i++) {
1348 rela = ef->relatab[i].rela;
1350 panic("lost a relatab!");
1351 relalim = rela + ef->relatab[i].nrela;
1352 base = findbase(ef, ef->relatab[i].sec);
1354 panic("lost base for relatab");
1355 for ( ; rela < relalim; rela++) {
1356 symidx = ELF_R_SYM(rela->r_info);
1357 if (symidx >= ef->ddbsymcnt)
1359 sym = ef->ddbsymtab + symidx;
1360 /* Only do local relocs */
1361 if (ELF_ST_BIND(sym->st_info) != STB_LOCAL)
1363 elf_reloc_local(lf, base, rela, ELF_RELOC_RELA,
1370 link_elf_symtab_get(linker_file_t lf, const Elf_Sym **symtab)
1372 elf_file_t ef = (elf_file_t)lf;
1374 *symtab = ef->ddbsymtab;
1376 if (*symtab == NULL)
1379 return (ef->ddbsymcnt);
1383 link_elf_strtab_get(linker_file_t lf, caddr_t *strtab)
1385 elf_file_t ef = (elf_file_t)lf;
1387 *strtab = ef->ddbstrtab;
1389 if (*strtab == NULL)
1392 return (ef->ddbstrcnt);