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) {
259 case SHT_AMD64_UNWIND:
265 symstrindex = shdr[i].sh_link;
276 shstrindex = hdr->e_shstrndx;
277 if (ef->nprogtab == 0 || symstrindex < 0 ||
278 symstrindex >= hdr->e_shnum ||
279 shdr[symstrindex].sh_type != SHT_STRTAB || shstrindex == 0 ||
280 shstrindex >= hdr->e_shnum ||
281 shdr[shstrindex].sh_type != SHT_STRTAB) {
282 printf("%s: bad/missing section headers\n", filename);
287 /* Allocate space for tracking the load chunks */
288 if (ef->nprogtab != 0)
289 ef->progtab = malloc(ef->nprogtab * sizeof(*ef->progtab),
290 M_LINKER, M_WAITOK | M_ZERO);
291 if (ef->nreltab != 0)
292 ef->reltab = malloc(ef->nreltab * sizeof(*ef->reltab),
293 M_LINKER, M_WAITOK | M_ZERO);
294 if (ef->nrelatab != 0)
295 ef->relatab = malloc(ef->nrelatab * sizeof(*ef->relatab),
296 M_LINKER, M_WAITOK | M_ZERO);
297 if ((ef->nprogtab != 0 && ef->progtab == NULL) ||
298 (ef->nreltab != 0 && ef->reltab == NULL) ||
299 (ef->nrelatab != 0 && ef->relatab == NULL)) {
304 /* XXX, relocate the sh_addr fields saved by the loader. */
306 for (i = 0; i < hdr->e_shnum; i++) {
307 if (shdr[i].sh_addr != 0 && (off == 0 || shdr[i].sh_addr < off))
308 off = shdr[i].sh_addr;
310 for (i = 0; i < hdr->e_shnum; i++) {
311 if (shdr[i].sh_addr != 0)
312 shdr[i].sh_addr = shdr[i].sh_addr - off +
313 (Elf_Addr)ef->address;
316 ef->ddbsymcnt = shdr[symtabindex].sh_size / sizeof(Elf_Sym);
317 ef->ddbsymtab = (Elf_Sym *)shdr[symtabindex].sh_addr;
318 ef->ddbstrcnt = shdr[symstrindex].sh_size;
319 ef->ddbstrtab = (char *)shdr[symstrindex].sh_addr;
320 ef->shstrcnt = shdr[shstrindex].sh_size;
321 ef->shstrtab = (char *)shdr[shstrindex].sh_addr;
323 /* Now fill out progtab and the relocation tables. */
327 for (i = 0; i < hdr->e_shnum; i++) {
328 switch (shdr[i].sh_type) {
332 case SHT_AMD64_UNWIND:
334 ef->progtab[pb].addr = (void *)shdr[i].sh_addr;
335 if (shdr[i].sh_type == SHT_PROGBITS)
336 ef->progtab[pb].name = "<<PROGBITS>>";
338 else if (shdr[i].sh_type == SHT_AMD64_UNWIND)
339 ef->progtab[pb].name = "<<UNWIND>>";
342 ef->progtab[pb].name = "<<NOBITS>>";
343 ef->progtab[pb].size = shdr[i].sh_size;
344 ef->progtab[pb].sec = i;
345 if (ef->shstrtab && shdr[i].sh_name != 0)
346 ef->progtab[pb].name =
347 ef->shstrtab + shdr[i].sh_name;
348 if (ef->progtab[pb].name != NULL &&
349 !strcmp(ef->progtab[pb].name, DPCPU_SETNAME)) {
352 dpcpu = dpcpu_alloc(shdr[i].sh_size);
357 memcpy(dpcpu, ef->progtab[pb].addr,
358 ef->progtab[pb].size);
359 dpcpu_copy(dpcpu, shdr[i].sh_size);
360 ef->progtab[pb].addr = dpcpu;
362 } else if (ef->progtab[pb].name != NULL &&
363 !strcmp(ef->progtab[pb].name, VNET_SETNAME)) {
366 vnet_data = vnet_data_alloc(shdr[i].sh_size);
367 if (vnet_data == NULL) {
371 memcpy(vnet_data, ef->progtab[pb].addr,
372 ef->progtab[pb].size);
373 vnet_data_copy(vnet_data, shdr[i].sh_size);
374 ef->progtab[pb].addr = vnet_data;
378 /* Update all symbol values with the offset. */
379 for (j = 0; j < ef->ddbsymcnt; j++) {
380 es = &ef->ddbsymtab[j];
381 if (es->st_shndx != i)
383 es->st_value += (Elf_Addr)ef->progtab[pb].addr;
388 ef->reltab[rl].rel = (Elf_Rel *)shdr[i].sh_addr;
389 ef->reltab[rl].nrel = shdr[i].sh_size / sizeof(Elf_Rel);
390 ef->reltab[rl].sec = shdr[i].sh_info;
394 ef->relatab[ra].rela = (Elf_Rela *)shdr[i].sh_addr;
395 ef->relatab[ra].nrela =
396 shdr[i].sh_size / sizeof(Elf_Rela);
397 ef->relatab[ra].sec = shdr[i].sh_info;
402 if (pb != ef->nprogtab)
403 panic("lost progbits");
404 if (rl != ef->nreltab)
405 panic("lost reltab");
406 if (ra != ef->nrelatab)
407 panic("lost relatab");
409 /* Local intra-module relocations */
410 link_elf_reloc_local(lf);
416 /* preload not done this way */
417 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
422 link_elf_link_preload_finish(linker_file_t lf)
428 error = relocate_file(ef);
432 /* Notify MD code that a module is being loaded. */
433 error = elf_cpu_load_file(lf);
441 link_elf_load_file(linker_class_t cls, const char *filename,
442 linker_file_t *result)
445 struct thread *td = curthread; /* XXX */
470 NDINIT(&nd, LOOKUP, FOLLOW | MPSAFE, UIO_SYSSPACE, filename, td);
472 error = vn_open(&nd, &flags, 0, NULL);
475 vfslocked = NDHASGIANT(&nd);
476 NDFREE(&nd, NDF_ONLY_PNBUF);
477 if (nd.ni_vp->v_type != VREG) {
482 error = mac_kld_check_load(td->td_ucred, nd.ni_vp);
488 /* Read the elf header from the file. */
489 hdr = malloc(sizeof(*hdr), M_LINKER, M_WAITOK);
490 error = vn_rdwr(UIO_READ, nd.ni_vp, (void *)hdr, sizeof(*hdr), 0,
491 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
505 if (hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS
506 || hdr->e_ident[EI_DATA] != ELF_TARG_DATA) {
507 link_elf_error(filename, "Unsupported file layout");
511 if (hdr->e_ident[EI_VERSION] != EV_CURRENT
512 || hdr->e_version != EV_CURRENT) {
513 link_elf_error(filename, "Unsupported file version");
517 if (hdr->e_type != ET_REL) {
521 if (hdr->e_machine != ELF_TARG_MACH) {
522 link_elf_error(filename, "Unsupported machine");
527 lf = linker_make_file(filename, &link_elf_class);
532 ef = (elf_file_t) lf;
538 /* Allocate and read in the section header */
539 nbytes = hdr->e_shnum * hdr->e_shentsize;
540 if (nbytes == 0 || hdr->e_shoff == 0 ||
541 hdr->e_shentsize != sizeof(Elf_Shdr)) {
545 shdr = malloc(nbytes, M_LINKER, M_WAITOK);
547 error = vn_rdwr(UIO_READ, nd.ni_vp, (caddr_t)shdr, nbytes, hdr->e_shoff,
548 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, &resid, td);
556 /* Scan the section header for information and table sizing. */
560 for (i = 0; i < hdr->e_shnum; i++) {
561 if (shdr[i].sh_size == 0)
563 switch (shdr[i].sh_type) {
567 case SHT_AMD64_UNWIND:
574 symstrindex = shdr[i].sh_link;
586 if (ef->nprogtab == 0) {
587 link_elf_error(filename, "file has no contents");
592 /* Only allow one symbol table for now */
593 link_elf_error(filename, "file has no valid symbol table");
597 if (symstrindex < 0 || symstrindex > hdr->e_shnum ||
598 shdr[symstrindex].sh_type != SHT_STRTAB) {
599 link_elf_error(filename, "file has invalid symbol strings");
604 /* Allocate space for tracking the load chunks */
605 if (ef->nprogtab != 0)
606 ef->progtab = malloc(ef->nprogtab * sizeof(*ef->progtab),
607 M_LINKER, M_WAITOK | M_ZERO);
608 if (ef->nreltab != 0)
609 ef->reltab = malloc(ef->nreltab * sizeof(*ef->reltab),
610 M_LINKER, M_WAITOK | M_ZERO);
611 if (ef->nrelatab != 0)
612 ef->relatab = malloc(ef->nrelatab * sizeof(*ef->relatab),
613 M_LINKER, M_WAITOK | M_ZERO);
615 if (symtabindex == -1)
616 panic("lost symbol table index");
617 /* Allocate space for and load the symbol table */
618 ef->ddbsymcnt = shdr[symtabindex].sh_size / sizeof(Elf_Sym);
619 ef->ddbsymtab = malloc(shdr[symtabindex].sh_size, M_LINKER, M_WAITOK);
620 error = vn_rdwr(UIO_READ, nd.ni_vp, (void *)ef->ddbsymtab,
621 shdr[symtabindex].sh_size, shdr[symtabindex].sh_offset,
622 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
631 if (symstrindex == -1)
632 panic("lost symbol string index");
633 /* Allocate space for and load the symbol strings */
634 ef->ddbstrcnt = shdr[symstrindex].sh_size;
635 ef->ddbstrtab = malloc(shdr[symstrindex].sh_size, M_LINKER, M_WAITOK);
636 error = vn_rdwr(UIO_READ, nd.ni_vp, ef->ddbstrtab,
637 shdr[symstrindex].sh_size, shdr[symstrindex].sh_offset,
638 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
647 /* Do we have a string table for the section names? */
649 if (hdr->e_shstrndx != 0 &&
650 shdr[hdr->e_shstrndx].sh_type == SHT_STRTAB) {
651 shstrindex = hdr->e_shstrndx;
652 ef->shstrcnt = shdr[shstrindex].sh_size;
653 ef->shstrtab = malloc(shdr[shstrindex].sh_size, M_LINKER,
655 error = vn_rdwr(UIO_READ, nd.ni_vp, ef->shstrtab,
656 shdr[shstrindex].sh_size, shdr[shstrindex].sh_offset,
657 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
667 /* Size up code/data(progbits) and bss(nobits). */
669 for (i = 0; i < hdr->e_shnum; i++) {
670 if (shdr[i].sh_size == 0)
672 switch (shdr[i].sh_type) {
676 case SHT_AMD64_UNWIND:
678 alignmask = shdr[i].sh_addralign - 1;
679 mapsize += alignmask;
680 mapsize &= ~alignmask;
681 mapsize += shdr[i].sh_size;
687 * We know how much space we need for the text/data/bss/etc.
688 * This stuff needs to be in a single chunk so that profiling etc
689 * can get the bounds and gdb can associate offsets with modules
691 ef->object = vm_object_allocate(OBJT_DEFAULT,
692 round_page(mapsize) >> PAGE_SHIFT);
693 if (ef->object == NULL) {
697 ef->address = (caddr_t) vm_map_min(kernel_map);
700 * In order to satisfy amd64's architectural requirements on the
701 * location of code and data in the kernel's address space, request a
702 * mapping that is above the kernel.
705 error = vm_map_find(kernel_map, ef->object, 0, &mapbase,
706 round_page(mapsize), TRUE, VM_PROT_ALL, VM_PROT_ALL, FALSE);
708 vm_object_deallocate(ef->object);
714 error = vm_map_wire(kernel_map, mapbase,
715 mapbase + round_page(mapsize),
716 VM_MAP_WIRE_SYSTEM|VM_MAP_WIRE_NOHOLES);
717 if (error != KERN_SUCCESS) {
722 /* Inform the kld system about the situation */
723 lf->address = ef->address = (caddr_t)mapbase;
727 * Now load code/data(progbits), zero bss(nobits), allocate space for
734 for (i = 0; i < hdr->e_shnum; i++) {
735 if (shdr[i].sh_size == 0)
737 switch (shdr[i].sh_type) {
741 case SHT_AMD64_UNWIND:
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 else if (shdr[i].sh_type == SHT_AMD64_UNWIND)
753 ef->progtab[pb].name = "<<UNWIND>>";
756 ef->progtab[pb].name = "<<NOBITS>>";
757 if (ef->progtab[pb].name != NULL &&
758 !strcmp(ef->progtab[pb].name, DPCPU_SETNAME))
759 ef->progtab[pb].addr =
760 dpcpu_alloc(shdr[i].sh_size);
762 else if (ef->progtab[pb].name != NULL &&
763 !strcmp(ef->progtab[pb].name, VNET_SETNAME))
764 ef->progtab[pb].addr =
765 vnet_data_alloc(shdr[i].sh_size);
768 ef->progtab[pb].addr =
769 (void *)(uintptr_t)mapbase;
770 if (ef->progtab[pb].addr == NULL) {
774 ef->progtab[pb].size = shdr[i].sh_size;
775 ef->progtab[pb].sec = i;
776 if (shdr[i].sh_type == SHT_PROGBITS
778 || shdr[i].sh_type == SHT_AMD64_UNWIND
781 error = vn_rdwr(UIO_READ, nd.ni_vp,
782 ef->progtab[pb].addr,
783 shdr[i].sh_size, shdr[i].sh_offset,
784 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred,
792 /* Initialize the per-cpu or vnet area. */
793 if (ef->progtab[pb].addr != (void *)mapbase &&
794 !strcmp(ef->progtab[pb].name, DPCPU_SETNAME))
795 dpcpu_copy(ef->progtab[pb].addr,
798 else if (ef->progtab[pb].addr !=
800 !strcmp(ef->progtab[pb].name, VNET_SETNAME))
801 vnet_data_copy(ef->progtab[pb].addr,
805 bzero(ef->progtab[pb].addr, shdr[i].sh_size);
807 /* Update all symbol values with the offset. */
808 for (j = 0; j < ef->ddbsymcnt; j++) {
809 es = &ef->ddbsymtab[j];
810 if (es->st_shndx != i)
812 es->st_value += (Elf_Addr)ef->progtab[pb].addr;
814 mapbase += shdr[i].sh_size;
818 ef->reltab[rl].rel = malloc(shdr[i].sh_size, M_LINKER,
820 ef->reltab[rl].nrel = shdr[i].sh_size / sizeof(Elf_Rel);
821 ef->reltab[rl].sec = shdr[i].sh_info;
822 error = vn_rdwr(UIO_READ, nd.ni_vp,
823 (void *)ef->reltab[rl].rel,
824 shdr[i].sh_size, shdr[i].sh_offset,
825 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
836 ef->relatab[ra].rela = malloc(shdr[i].sh_size, M_LINKER,
838 ef->relatab[ra].nrela =
839 shdr[i].sh_size / sizeof(Elf_Rela);
840 ef->relatab[ra].sec = shdr[i].sh_info;
841 error = vn_rdwr(UIO_READ, nd.ni_vp,
842 (void *)ef->relatab[ra].rela,
843 shdr[i].sh_size, shdr[i].sh_offset,
844 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
856 if (pb != ef->nprogtab)
857 panic("lost progbits");
858 if (rl != ef->nreltab)
859 panic("lost reltab");
860 if (ra != ef->nrelatab)
861 panic("lost relatab");
862 if (mapbase != (vm_offset_t)ef->address + mapsize)
863 panic("mapbase 0x%lx != address %p + mapsize 0x%lx (0x%lx)\n",
864 (u_long)mapbase, ef->address, (u_long)mapsize,
865 (u_long)(vm_offset_t)ef->address + mapsize);
867 /* Local intra-module relocations */
868 link_elf_reloc_local(lf);
870 /* Pull in dependencies */
871 VOP_UNLOCK(nd.ni_vp, 0);
872 error = linker_load_dependencies(lf);
873 vn_lock(nd.ni_vp, LK_EXCLUSIVE | LK_RETRY);
877 /* External relocations */
878 error = relocate_file(ef);
882 /* Notify MD code that a module is being loaded. */
883 error = elf_cpu_load_file(lf);
890 VOP_UNLOCK(nd.ni_vp, 0);
891 vn_close(nd.ni_vp, FREAD, td->td_ucred, td);
892 VFS_UNLOCK_GIANT(vfslocked);
894 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
902 link_elf_unload_file(linker_file_t file)
904 elf_file_t ef = (elf_file_t) file;
907 /* Notify MD code that a module is being unloaded. */
908 elf_cpu_unload_file(file);
911 for (i = 0; i < ef->nprogtab; i++) {
912 if (ef->progtab[i].size == 0)
914 if (ef->progtab[i].name == NULL)
916 if (!strcmp(ef->progtab[i].name, DPCPU_SETNAME))
917 dpcpu_free(ef->progtab[i].addr,
918 ef->progtab[i].size);
920 else if (!strcmp(ef->progtab[i].name, VNET_SETNAME))
921 vnet_data_free(ef->progtab[i].addr,
922 ef->progtab[i].size);
928 free(ef->reltab, M_LINKER);
930 free(ef->relatab, M_LINKER);
932 free(ef->progtab, M_LINKER);
934 free(ef->ctftab, M_LINKER);
936 free(ef->ctfoff, M_LINKER);
938 free(ef->typoff, M_LINKER);
939 if (file->filename != NULL)
940 preload_delete_name(file->filename);
941 /* XXX reclaim module memory? */
945 for (i = 0; i < ef->nreltab; i++)
946 if (ef->reltab[i].rel)
947 free(ef->reltab[i].rel, M_LINKER);
948 for (i = 0; i < ef->nrelatab; i++)
949 if (ef->relatab[i].rela)
950 free(ef->relatab[i].rela, M_LINKER);
952 free(ef->reltab, M_LINKER);
954 free(ef->relatab, M_LINKER);
956 free(ef->progtab, M_LINKER);
959 vm_map_remove(kernel_map, (vm_offset_t) ef->address,
960 (vm_offset_t) ef->address +
961 (ef->object->size << PAGE_SHIFT));
964 free(ef->e_shdr, M_LINKER);
966 free(ef->ddbsymtab, M_LINKER);
968 free(ef->ddbstrtab, M_LINKER);
970 free(ef->shstrtab, M_LINKER);
972 free(ef->ctftab, M_LINKER);
974 free(ef->ctfoff, M_LINKER);
976 free(ef->typoff, M_LINKER);
980 symbol_name(elf_file_t ef, Elf_Size r_info)
984 if (ELF_R_SYM(r_info)) {
985 ref = ef->ddbsymtab + ELF_R_SYM(r_info);
986 return ef->ddbstrtab + ref->st_name;
992 findbase(elf_file_t ef, int sec)
997 for (i = 0; i < ef->nprogtab; i++) {
998 if (sec == ef->progtab[i].sec) {
999 base = (Elf_Addr)ef->progtab[i].addr;
1007 relocate_file(elf_file_t ef)
1009 const Elf_Rel *rellim;
1011 const Elf_Rela *relalim;
1012 const Elf_Rela *rela;
1013 const char *symname;
1020 /* Perform relocations without addend if there are any: */
1021 for (i = 0; i < ef->nreltab; i++) {
1022 rel = ef->reltab[i].rel;
1024 panic("lost a reltab!");
1025 rellim = rel + ef->reltab[i].nrel;
1026 base = findbase(ef, ef->reltab[i].sec);
1028 panic("lost base for reltab");
1029 for ( ; rel < rellim; rel++) {
1030 symidx = ELF_R_SYM(rel->r_info);
1031 if (symidx >= ef->ddbsymcnt)
1033 sym = ef->ddbsymtab + symidx;
1034 /* Local relocs are already done */
1035 if (ELF_ST_BIND(sym->st_info) == STB_LOCAL)
1037 if (elf_reloc(&ef->lf, base, rel, ELF_RELOC_REL,
1039 symname = symbol_name(ef, rel->r_info);
1040 printf("link_elf_obj: symbol %s undefined\n",
1047 /* Perform relocations with addend if there are any: */
1048 for (i = 0; i < ef->nrelatab; i++) {
1049 rela = ef->relatab[i].rela;
1051 panic("lost a relatab!");
1052 relalim = rela + ef->relatab[i].nrela;
1053 base = findbase(ef, ef->relatab[i].sec);
1055 panic("lost base for relatab");
1056 for ( ; rela < relalim; rela++) {
1057 symidx = ELF_R_SYM(rela->r_info);
1058 if (symidx >= ef->ddbsymcnt)
1060 sym = ef->ddbsymtab + symidx;
1061 /* Local relocs are already done */
1062 if (ELF_ST_BIND(sym->st_info) == STB_LOCAL)
1064 if (elf_reloc(&ef->lf, base, rela, ELF_RELOC_RELA,
1066 symname = symbol_name(ef, rela->r_info);
1067 printf("link_elf_obj: symbol %s undefined\n",
1078 link_elf_lookup_symbol(linker_file_t lf, const char *name, c_linker_sym_t *sym)
1080 elf_file_t ef = (elf_file_t) lf;
1081 const Elf_Sym *symp;
1085 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) {
1086 strp = ef->ddbstrtab + symp->st_name;
1087 if (symp->st_shndx != SHN_UNDEF && strcmp(name, strp) == 0) {
1088 *sym = (c_linker_sym_t) symp;
1096 link_elf_symbol_values(linker_file_t lf, c_linker_sym_t sym,
1097 linker_symval_t *symval)
1099 elf_file_t ef = (elf_file_t) lf;
1100 const Elf_Sym *es = (const Elf_Sym*) sym;
1102 if (es >= ef->ddbsymtab && es < (ef->ddbsymtab + ef->ddbsymcnt)) {
1103 symval->name = ef->ddbstrtab + es->st_name;
1104 symval->value = (caddr_t)es->st_value;
1105 symval->size = es->st_size;
1112 link_elf_search_symbol(linker_file_t lf, caddr_t value,
1113 c_linker_sym_t *sym, long *diffp)
1115 elf_file_t ef = (elf_file_t) lf;
1116 u_long off = (uintptr_t) (void *) value;
1120 const Elf_Sym *best = 0;
1123 for (i = 0, es = ef->ddbsymtab; i < ef->ddbsymcnt; i++, es++) {
1124 if (es->st_name == 0)
1126 st_value = es->st_value;
1127 if (off >= st_value) {
1128 if (off - st_value < diff) {
1129 diff = off - st_value;
1133 } else if (off - st_value == diff) {
1142 *sym = (c_linker_sym_t) best;
1148 * Look up a linker set on an ELF system.
1151 link_elf_lookup_set(linker_file_t lf, const char *name,
1152 void ***startp, void ***stopp, int *countp)
1154 elf_file_t ef = (elf_file_t)lf;
1155 void **start, **stop;
1158 /* Relative to section number */
1159 for (i = 0; i < ef->nprogtab; i++) {
1160 if ((strncmp(ef->progtab[i].name, "set_", 4) == 0) &&
1161 strcmp(ef->progtab[i].name + 4, name) == 0) {
1162 start = (void **)ef->progtab[i].addr;
1163 stop = (void **)((char *)ef->progtab[i].addr +
1164 ef->progtab[i].size);
1165 count = stop - start;
1179 link_elf_each_function_name(linker_file_t file,
1180 int (*callback)(const char *, void *), void *opaque)
1182 elf_file_t ef = (elf_file_t)file;
1183 const Elf_Sym *symp;
1186 /* Exhaustive search */
1187 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) {
1188 if (symp->st_value != 0 &&
1189 ELF_ST_TYPE(symp->st_info) == STT_FUNC) {
1190 error = callback(ef->ddbstrtab + symp->st_name, opaque);
1199 link_elf_each_function_nameval(linker_file_t file,
1200 linker_function_nameval_callback_t callback, void *opaque)
1202 linker_symval_t symval;
1203 elf_file_t ef = (elf_file_t)file;
1204 const Elf_Sym* symp;
1207 /* Exhaustive search */
1208 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) {
1209 if (symp->st_value != 0 &&
1210 ELF_ST_TYPE(symp->st_info) == STT_FUNC) {
1211 error = link_elf_symbol_values(file, (c_linker_sym_t) symp, &symval);
1214 error = callback(file, i, &symval, opaque);
1223 * Symbol lookup function that can be used when the symbol index is known (ie
1224 * in relocations). It uses the symbol index instead of doing a fully fledged
1225 * hash table based lookup when such is valid. For example for local symbols.
1226 * This is not only more efficient, it's also more correct. It's not always
1227 * the case that the symbol can be found through the hash table.
1230 elf_obj_lookup(linker_file_t lf, Elf_Size symidx, int deps)
1232 elf_file_t ef = (elf_file_t)lf;
1237 /* Don't even try to lookup the symbol if the index is bogus. */
1238 if (symidx >= ef->ddbsymcnt)
1241 sym = ef->ddbsymtab + symidx;
1243 /* Quick answer if there is a definition included. */
1244 if (sym->st_shndx != SHN_UNDEF)
1245 return (sym->st_value);
1247 /* If we get here, then it is undefined and needs a lookup. */
1248 switch (ELF_ST_BIND(sym->st_info)) {
1250 /* Local, but undefined? huh? */
1254 /* Relative to Data or Function name */
1255 symbol = ef->ddbstrtab + sym->st_name;
1257 /* Force a lookup failure if the symbol name is bogus. */
1260 ret = ((Elf_Addr)linker_file_lookup_symbol(lf, symbol, deps));
1264 printf("link_elf_obj: Weak symbols not supported\n");
1273 link_elf_fix_link_set(elf_file_t ef)
1275 static const char startn[] = "__start_";
1276 static const char stopn[] = "__stop_";
1278 const char *sym_name, *linkset_name;
1279 Elf_Addr startp, stopp;
1284 for (symidx = 1 /* zero entry is special */;
1285 symidx < ef->ddbsymcnt; symidx++) {
1286 sym = ef->ddbsymtab + symidx;
1287 if (sym->st_shndx != SHN_UNDEF)
1290 sym_name = ef->ddbstrtab + sym->st_name;
1291 if (strncmp(sym_name, startn, sizeof(startn) - 1) == 0) {
1293 linkset_name = sym_name + sizeof(startn) - 1;
1295 else if (strncmp(sym_name, stopn, sizeof(stopn) - 1) == 0) {
1297 linkset_name = sym_name + sizeof(stopn) - 1;
1302 for (i = 0; i < ef->nprogtab; i++) {
1303 if (strcmp(ef->progtab[i].name, linkset_name) == 0) {
1304 startp = (Elf_Addr)ef->progtab[i].addr;
1305 stopp = (Elf_Addr)(startp + ef->progtab[i].size);
1309 if (i == ef->nprogtab)
1312 sym->st_value = start ? startp : stopp;
1318 link_elf_reloc_local(linker_file_t lf)
1320 elf_file_t ef = (elf_file_t)lf;
1321 const Elf_Rel *rellim;
1323 const Elf_Rela *relalim;
1324 const Elf_Rela *rela;
1330 link_elf_fix_link_set(ef);
1332 /* Perform relocations without addend if there are any: */
1333 for (i = 0; i < ef->nreltab; i++) {
1334 rel = ef->reltab[i].rel;
1336 panic("lost a reltab!");
1337 rellim = rel + ef->reltab[i].nrel;
1338 base = findbase(ef, ef->reltab[i].sec);
1340 panic("lost base for reltab");
1341 for ( ; rel < rellim; rel++) {
1342 symidx = ELF_R_SYM(rel->r_info);
1343 if (symidx >= ef->ddbsymcnt)
1345 sym = ef->ddbsymtab + symidx;
1346 /* Only do local relocs */
1347 if (ELF_ST_BIND(sym->st_info) != STB_LOCAL)
1349 elf_reloc_local(lf, base, rel, ELF_RELOC_REL,
1354 /* Perform relocations with addend if there are any: */
1355 for (i = 0; i < ef->nrelatab; i++) {
1356 rela = ef->relatab[i].rela;
1358 panic("lost a relatab!");
1359 relalim = rela + ef->relatab[i].nrela;
1360 base = findbase(ef, ef->relatab[i].sec);
1362 panic("lost base for relatab");
1363 for ( ; rela < relalim; rela++) {
1364 symidx = ELF_R_SYM(rela->r_info);
1365 if (symidx >= ef->ddbsymcnt)
1367 sym = ef->ddbsymtab + symidx;
1368 /* Only do local relocs */
1369 if (ELF_ST_BIND(sym->st_info) != STB_LOCAL)
1371 elf_reloc_local(lf, base, rela, ELF_RELOC_RELA,
1378 link_elf_symtab_get(linker_file_t lf, const Elf_Sym **symtab)
1380 elf_file_t ef = (elf_file_t)lf;
1382 *symtab = ef->ddbsymtab;
1384 if (*symtab == NULL)
1387 return (ef->ddbsymcnt);
1391 link_elf_strtab_get(linker_file_t lf, caddr_t *strtab)
1393 elf_file_t ef = (elf_file_t)lf;
1395 *strtab = ef->ddbstrtab;
1397 if (*strtab == NULL)
1400 return (ef->ddbstrcnt);