2 * Copyright (c) 1998 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
27 * $FreeBSD: src/sys/kern/link_elf.c,v 1.24 1999/12/24 15:33:36 bde Exp $
28 * $DragonFly: src/sys/kern/link_elf.c,v 1.29 2008/08/01 23:11:16 dillon Exp $
31 #include <sys/param.h>
32 #include <sys/kernel.h>
33 #include <sys/systm.h>
34 #include <sys/malloc.h>
36 #include <sys/nlookup.h>
37 #include <sys/fcntl.h>
38 #include <sys/vnode.h>
39 #include <sys/linker.h>
40 #include <machine/elf.h>
43 #include <vm/vm_param.h>
44 #include <vm/vm_zone.h>
45 #include <vm/vm_object.h>
46 #include <vm/vm_kern.h>
47 #include <vm/vm_extern.h>
50 #include <vm/vm_map.h>
52 static int link_elf_obj_preload_file(const char *, linker_file_t *);
53 static int link_elf_obj_preload_finish(linker_file_t);
54 static int link_elf_obj_load_file(const char *, linker_file_t *);
56 link_elf_obj_lookup_symbol(linker_file_t, const char *,
58 static int link_elf_obj_symbol_values(linker_file_t, c_linker_sym_t, linker_symval_t *);
60 link_elf_obj_search_symbol(linker_file_t, caddr_t value,
61 c_linker_sym_t * sym, long *diffp);
63 static void link_elf_obj_unload_file(linker_file_t);
65 link_elf_obj_lookup_set(linker_file_t, const char *,
66 void ***, void ***, int *);
67 static void link_elf_obj_reloc_local(linker_file_t lf);
68 static int elf_obj_lookup(linker_file_t lf, Elf_Size symidx, int deps, Elf_Addr *);
70 static struct linker_class_ops link_elf_obj_class_ops = {
71 link_elf_obj_load_file,
72 link_elf_obj_preload_file,
75 static struct linker_file_ops link_elf_obj_file_ops = {
76 .lookup_symbol = link_elf_obj_lookup_symbol,
77 .symbol_values = link_elf_obj_symbol_values,
78 .search_symbol = link_elf_obj_search_symbol,
79 .preload_finish = link_elf_obj_preload_finish,
80 .unload = link_elf_obj_unload_file,
81 .lookup_set = link_elf_obj_lookup_set,
88 int sec; /* Original section */
105 typedef struct elf_file {
108 caddr_t address; /* Relocation address */
109 vm_object_t object; /* VM object to hold file pages */
112 Elf_progent *progtab;
115 Elf_relaent *relatab;
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 */
126 caddr_t shstrtab; /* Section name string table */
127 long shstrcnt; /* number of bytes in string table */
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. */
137 static int relocate_file(linker_file_t lf);
140 * The kernel symbol table starts here.
142 extern struct _dynamic _DYNAMIC;
145 link_elf_obj_init(void *arg)
147 #if ELF_TARG_CLASS == ELFCLASS32
148 linker_add_class("elf32", NULL, &link_elf_obj_class_ops);
150 linker_add_class("elf64", NULL, &link_elf_obj_class_ops);
154 SYSINIT(link_elf, SI_BOOT2_KLD, SI_ORDER_SECOND, link_elf_obj_init, 0);
157 link_elf_obj_error(const char *file, const char *s)
159 kprintf("kldload: %s: %s\n", file, s);
163 link_elf_obj_preload_file(const char *filename, linker_file_t *result)
168 caddr_t modptr, baseptr, sizeptr;
173 int error, i, j, pb, ra, rl, shstrindex, symstrindex, symtabindex;
176 * Look to see if we have the module preloaded.
178 modptr = preload_search_by_name(filename);
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 |
188 shdr = (Elf_Shdr *) preload_search_info(modptr, MODINFO_METADATA |
191 (strcmp(type, "elf" __XSTRING(__ELF_WORD_SIZE) " obj module") != 0 &&
192 strcmp(type, "elf obj module") != 0)) {
195 if (baseptr == NULL || sizeptr == NULL || hdr == NULL || shdr == NULL)
198 ef = kmalloc(sizeof(struct elf_file), M_LINKER, M_WAITOK | M_ZERO);
200 ef->address = *(caddr_t *) baseptr;
201 lf = linker_make_file(filename, ef, &link_elf_obj_file_ops);
206 lf->address = ef->address;
207 lf->size = *(size_t *) sizeptr;
209 if (hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS ||
210 hdr->e_ident[EI_DATA] != ELF_TARG_DATA ||
211 hdr->e_ident[EI_VERSION] != EV_CURRENT ||
212 hdr->e_version != EV_CURRENT ||
213 hdr->e_type != ET_REL ||
214 hdr->e_machine != ELF_TARG_MACH) {
220 /* Scan the section header for information and table sizing. */
223 for (i = 0; i < hdr->e_shnum; i++) {
224 switch (shdr[i].sh_type) {
231 symstrindex = shdr[i].sh_link;
242 shstrindex = hdr->e_shstrndx;
243 if (ef->nprogtab == 0 || symstrindex < 0 ||
244 symstrindex >= hdr->e_shnum ||
245 shdr[symstrindex].sh_type != SHT_STRTAB || shstrindex == 0 ||
246 shstrindex >= hdr->e_shnum ||
247 shdr[shstrindex].sh_type != SHT_STRTAB) {
251 /* Allocate space for tracking the load chunks */
252 if (ef->nprogtab != 0)
253 ef->progtab = kmalloc(ef->nprogtab * sizeof(*ef->progtab),
254 M_LINKER, M_WAITOK | M_ZERO);
255 if (ef->nreltab != 0)
256 ef->reltab = kmalloc(ef->nreltab * sizeof(*ef->reltab),
257 M_LINKER, M_WAITOK | M_ZERO);
258 if (ef->nrelatab != 0)
259 ef->relatab = kmalloc(ef->nrelatab * sizeof(*ef->relatab),
260 M_LINKER, M_WAITOK | M_ZERO);
261 if ((ef->nprogtab != 0 && ef->progtab == NULL) ||
262 (ef->nreltab != 0 && ef->reltab == NULL) ||
263 (ef->nrelatab != 0 && ef->relatab == NULL)) {
267 /* XXX, relocate the sh_addr fields saved by the loader. */
269 for (i = 0; i < hdr->e_shnum; i++) {
270 if (shdr[i].sh_addr != 0 && (off == 0 || shdr[i].sh_addr < off))
271 off = shdr[i].sh_addr;
273 for (i = 0; i < hdr->e_shnum; i++) {
274 if (shdr[i].sh_addr != 0)
275 shdr[i].sh_addr = shdr[i].sh_addr - off +
276 (Elf_Addr) ef->address;
279 ef->ddbsymcnt = shdr[symtabindex].sh_size / sizeof(Elf_Sym);
280 ef->ddbsymtab = (Elf_Sym *) shdr[symtabindex].sh_addr;
281 ef->ddbstrcnt = shdr[symstrindex].sh_size;
282 ef->ddbstrtab = (char *)shdr[symstrindex].sh_addr;
283 ef->shstrcnt = shdr[shstrindex].sh_size;
284 ef->shstrtab = (char *)shdr[shstrindex].sh_addr;
286 /* Now fill out progtab and the relocation tables. */
290 for (i = 0; i < hdr->e_shnum; i++) {
291 switch (shdr[i].sh_type) {
294 ef->progtab[pb].addr = (void *)shdr[i].sh_addr;
295 if (shdr[i].sh_type == SHT_PROGBITS)
296 ef->progtab[pb].name = "<<PROGBITS>>";
298 ef->progtab[pb].name = "<<NOBITS>>";
299 ef->progtab[pb].size = shdr[i].sh_size;
300 ef->progtab[pb].sec = i;
301 if (ef->shstrtab && shdr[i].sh_name != 0)
302 ef->progtab[pb].name =
303 ef->shstrtab + shdr[i].sh_name;
305 if (ef->progtab[pb].name != NULL &&
306 !strcmp(ef->progtab[pb].name, "set_pcpu")) {
309 dpcpu = dpcpu_alloc(shdr[i].sh_size);
314 memcpy(dpcpu, ef->progtab[pb].addr,
315 ef->progtab[pb].size);
316 dpcpu_copy(dpcpu, shdr[i].sh_size);
317 ef->progtab[pb].addr = dpcpu;
319 } else if (ef->progtab[pb].name != NULL &&
320 !strcmp(ef->progtab[pb].name, VNET_SETNAME)) {
323 vnet_data = vnet_data_alloc(shdr[i].sh_size);
324 if (vnet_data == NULL) {
328 memcpy(vnet_data, ef->progtab[pb].addr,
329 ef->progtab[pb].size);
330 vnet_data_copy(vnet_data, shdr[i].sh_size);
331 ef->progtab[pb].addr = vnet_data;
335 /* Update all symbol values with the offset. */
336 for (j = 0; j < ef->ddbsymcnt; j++) {
337 es = &ef->ddbsymtab[j];
338 if (es->st_shndx != i)
340 es->st_value += (Elf_Addr) ef->progtab[pb].addr;
345 ef->reltab[rl].rel = (Elf_Rel *) shdr[i].sh_addr;
346 ef->reltab[rl].nrel = shdr[i].sh_size / sizeof(Elf_Rel);
347 ef->reltab[rl].sec = shdr[i].sh_info;
351 ef->relatab[ra].rela = (Elf_Rela *) shdr[i].sh_addr;
352 ef->relatab[ra].nrela =
353 shdr[i].sh_size / sizeof(Elf_Rela);
354 ef->relatab[ra].sec = shdr[i].sh_info;
359 if (pb != ef->nprogtab)
360 panic("lost progbits");
361 if (rl != ef->nreltab)
362 panic("lost reltab");
363 if (ra != ef->nrelatab)
364 panic("lost relatab");
366 /* Local intra-module relocations */
367 link_elf_obj_reloc_local(lf);
373 /* preload not done this way */
374 linker_file_unload(lf /* , LINKER_UNLOAD_FORCE */ );
379 link_elf_obj_preload_finish(linker_file_t lf)
383 error = relocate_file(lf);
389 link_elf_obj_load_file(const char *filename, linker_file_t * result)
391 struct nlookupdata nd;
392 struct thread *td = curthread; /* XXX */
393 struct proc *p = td->td_proc;
414 if (p->p_ucred == NULL) {
415 kprintf("link_elf_obj_load_file: cannot load '%s' from filesystem"
416 " this early\n", filename);
423 pathname = linker_search_path(filename);
424 if (pathname == NULL)
427 error = nlookup_init(&nd, pathname, UIO_SYSSPACE, NLC_FOLLOW | NLC_LOCKVP);
429 error = vn_open(&nd, NULL, FREAD, 0);
430 kfree(pathname, M_LINKER);
436 nd.nl_open_vp = NULL;
440 * Read the elf header from the file.
442 hdr = kmalloc(sizeof(*hdr), M_LINKER, M_WAITOK);
447 error = vn_rdwr(UIO_READ, vp, (void *)hdr, sizeof(*hdr), 0,
448 UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
460 if (hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS
461 || hdr->e_ident[EI_DATA] != ELF_TARG_DATA) {
462 link_elf_obj_error(filename, "Unsupported file layout");
466 if (hdr->e_ident[EI_VERSION] != EV_CURRENT
467 || hdr->e_version != EV_CURRENT) {
468 link_elf_obj_error(filename, "Unsupported file version");
472 if (hdr->e_type != ET_REL) {
476 if (hdr->e_machine != ELF_TARG_MACH) {
477 link_elf_obj_error(filename, "Unsupported machine");
482 ef = kmalloc(sizeof(struct elf_file), M_LINKER, M_WAITOK | M_ZERO);
483 lf = linker_make_file(filename, ef, &link_elf_obj_file_ops);
494 /* Allocate and read in the section header */
495 nbytes = hdr->e_shnum * hdr->e_shentsize;
496 if (nbytes == 0 || hdr->e_shoff == 0 ||
497 hdr->e_shentsize != sizeof(Elf_Shdr)) {
501 shdr = kmalloc(nbytes, M_LINKER, M_WAITOK);
507 error = vn_rdwr(UIO_READ, vp, (caddr_t) shdr, nbytes, hdr->e_shoff,
508 UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
515 /* Scan the section header for information and table sizing. */
519 for (i = 0; i < hdr->e_shnum; i++) {
520 switch (shdr[i].sh_type) {
528 symstrindex = shdr[i].sh_link;
540 if (ef->nprogtab == 0) {
541 link_elf_obj_error(filename, "file has no contents");
546 /* Only allow one symbol table for now */
547 link_elf_obj_error(filename, "file has no valid symbol table");
551 if (symstrindex < 0 || symstrindex > hdr->e_shnum ||
552 shdr[symstrindex].sh_type != SHT_STRTAB) {
553 link_elf_obj_error(filename, "file has invalid symbol strings");
557 /* Allocate space for tracking the load chunks */
558 if (ef->nprogtab != 0)
559 ef->progtab = kmalloc(ef->nprogtab * sizeof(*ef->progtab),
560 M_LINKER, M_WAITOK | M_ZERO);
561 if (ef->nreltab != 0)
562 ef->reltab = kmalloc(ef->nreltab * sizeof(*ef->reltab),
563 M_LINKER, M_WAITOK | M_ZERO);
564 if (ef->nrelatab != 0)
565 ef->relatab = kmalloc(ef->nrelatab * sizeof(*ef->relatab),
566 M_LINKER, M_WAITOK | M_ZERO);
567 if ((ef->nprogtab != 0 && ef->progtab == NULL) ||
568 (ef->nreltab != 0 && ef->reltab == NULL) ||
569 (ef->nrelatab != 0 && ef->relatab == NULL)) {
573 if (symtabindex == -1)
574 panic("lost symbol table index");
575 /* Allocate space for and load the symbol table */
576 ef->ddbsymcnt = shdr[symtabindex].sh_size / sizeof(Elf_Sym);
577 ef->ddbsymtab = kmalloc(shdr[symtabindex].sh_size, M_LINKER, M_WAITOK);
578 if (ef->ddbsymtab == NULL) {
582 error = vn_rdwr(UIO_READ, vp, (void *)ef->ddbsymtab,
583 shdr[symtabindex].sh_size, shdr[symtabindex].sh_offset,
584 UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
591 if (symstrindex == -1)
592 panic("lost symbol string index");
593 /* Allocate space for and load the symbol strings */
594 ef->ddbstrcnt = shdr[symstrindex].sh_size;
595 ef->ddbstrtab = kmalloc(shdr[symstrindex].sh_size, M_LINKER, M_WAITOK);
596 if (ef->ddbstrtab == NULL) {
600 error = vn_rdwr(UIO_READ, vp, ef->ddbstrtab,
601 shdr[symstrindex].sh_size, shdr[symstrindex].sh_offset,
602 UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
609 /* Do we have a string table for the section names? */
611 if (hdr->e_shstrndx != 0 &&
612 shdr[hdr->e_shstrndx].sh_type == SHT_STRTAB) {
613 shstrindex = hdr->e_shstrndx;
614 ef->shstrcnt = shdr[shstrindex].sh_size;
615 ef->shstrtab = kmalloc(shdr[shstrindex].sh_size, M_LINKER,
617 if (ef->shstrtab == NULL) {
621 error = vn_rdwr(UIO_READ, vp, ef->shstrtab,
622 shdr[shstrindex].sh_size, shdr[shstrindex].sh_offset,
623 UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
631 /* Size up code/data(progbits) and bss(nobits). */
633 for (i = 0; i < hdr->e_shnum; i++) {
634 switch (shdr[i].sh_type) {
637 alignmask = shdr[i].sh_addralign - 1;
638 mapsize += alignmask;
639 mapsize &= ~alignmask;
640 mapsize += shdr[i].sh_size;
646 * We know how much space we need for the text/data/bss/etc. This
647 * stuff needs to be in a single chunk so that profiling etc can get
648 * the bounds and gdb can associate offsets with modules
650 ef->object = vm_object_allocate(OBJT_DEFAULT,
651 round_page(mapsize) >> PAGE_SHIFT);
652 if (ef->object == NULL) {
656 ef->address = (caddr_t) vm_map_min(&kernel_map);
659 * In order to satisfy amd64's architectural requirements on the
660 * location of code and data in the kernel's address space, request a
661 * mapping that is above the kernel.
664 error = vm_map_find(&kernel_map, ef->object, 0, &mapbase,
665 round_page(mapsize), TRUE, VM_MAPTYPE_NORMAL,
666 VM_PROT_ALL, VM_PROT_ALL, FALSE);
668 vm_object_deallocate(ef->object);
673 error = vm_map_wire(&kernel_map, mapbase,
674 mapbase + round_page(mapsize), 0);
675 if (error != KERN_SUCCESS) {
679 /* Inform the kld system about the situation */
680 lf->address = ef->address = (caddr_t) mapbase;
684 * Now load code/data(progbits), zero bss(nobits), allocate space for
691 for (i = 0; i < hdr->e_shnum; i++) {
692 switch (shdr[i].sh_type) {
695 alignmask = shdr[i].sh_addralign - 1;
696 mapbase += alignmask;
697 mapbase &= ~alignmask;
698 if (ef->shstrtab && shdr[i].sh_name != 0)
699 ef->progtab[pb].name =
700 ef->shstrtab + shdr[i].sh_name;
701 else if (shdr[i].sh_type == SHT_PROGBITS)
702 ef->progtab[pb].name = "<<PROGBITS>>";
704 ef->progtab[pb].name = "<<NOBITS>>";
706 if (ef->progtab[pb].name != NULL &&
707 !strcmp(ef->progtab[pb].name, "set_pcpu"))
708 ef->progtab[pb].addr =
709 dpcpu_alloc(shdr[i].sh_size);
711 else if (ef->progtab[pb].name != NULL &&
712 !strcmp(ef->progtab[pb].name, VNET_SETNAME))
713 ef->progtab[pb].addr =
714 vnet_data_alloc(shdr[i].sh_size);
718 ef->progtab[pb].addr =
719 (void *)(uintptr_t) mapbase;
720 if (ef->progtab[pb].addr == NULL) {
724 ef->progtab[pb].size = shdr[i].sh_size;
725 ef->progtab[pb].sec = i;
726 if (shdr[i].sh_type == SHT_PROGBITS) {
727 error = vn_rdwr(UIO_READ, vp,
728 ef->progtab[pb].addr,
729 shdr[i].sh_size, shdr[i].sh_offset,
730 UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred,
739 /* Initialize the per-cpu or vnet area. */
740 if (ef->progtab[pb].addr != (void *)mapbase &&
741 !strcmp(ef->progtab[pb].name, "set_pcpu"))
742 dpcpu_copy(ef->progtab[pb].addr,
745 else if (ef->progtab[pb].addr !=
747 !strcmp(ef->progtab[pb].name, VNET_SETNAME))
748 vnet_data_copy(ef->progtab[pb].addr,
753 bzero(ef->progtab[pb].addr, shdr[i].sh_size);
755 /* Update all symbol values with the offset. */
756 for (j = 0; j < ef->ddbsymcnt; j++) {
757 es = &ef->ddbsymtab[j];
758 if (es->st_shndx != i)
760 es->st_value += (Elf_Addr) ef->progtab[pb].addr;
762 mapbase += shdr[i].sh_size;
766 ef->reltab[rl].rel = kmalloc(shdr[i].sh_size, M_LINKER, M_WAITOK);
767 ef->reltab[rl].nrel = shdr[i].sh_size / sizeof(Elf_Rel);
768 ef->reltab[rl].sec = shdr[i].sh_info;
769 error = vn_rdwr(UIO_READ, vp,
770 (void *)ef->reltab[rl].rel,
771 shdr[i].sh_size, shdr[i].sh_offset,
772 UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
782 ef->relatab[ra].rela = kmalloc(shdr[i].sh_size, M_LINKER, M_WAITOK);
783 ef->relatab[ra].nrela = shdr[i].sh_size / sizeof(Elf_Rela);
784 ef->relatab[ra].sec = shdr[i].sh_info;
785 error = vn_rdwr(UIO_READ, vp,
786 (void *)ef->relatab[ra].rela,
787 shdr[i].sh_size, shdr[i].sh_offset,
788 UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
799 if (pb != ef->nprogtab)
800 panic("lost progbits");
801 if (rl != ef->nreltab)
802 panic("lost reltab");
803 if (ra != ef->nrelatab)
804 panic("lost relatab");
805 if (mapbase != (vm_offset_t) ef->address + mapsize)
806 panic("mapbase 0x%lx != address %p + mapsize 0x%lx (0x%lx)\n",
807 mapbase, ef->address, mapsize,
808 (vm_offset_t) ef->address + mapsize);
810 /* Local intra-module relocations */
811 link_elf_obj_reloc_local(lf);
813 /* Pull in dependencies */
814 error = linker_load_dependencies(lf);
818 /* External relocations */
819 error = relocate_file(lf);
827 linker_file_unload(lf /*, LINKER_UNLOAD_FORCE */);
829 kfree(hdr, M_LINKER);
837 link_elf_obj_unload_file(linker_file_t file)
839 elf_file_t ef = file->priv;
843 for (i = 0; i < ef->nprogtab; i++) {
844 if (ef->progtab[i].size == 0)
846 if (ef->progtab[i].name == NULL)
849 if (!strcmp(ef->progtab[i].name, "set_pcpu"))
850 dpcpu_free(ef->progtab[i].addr,
851 ef->progtab[i].size);
853 else if (!strcmp(ef->progtab[i].name, VNET_SETNAME))
854 vnet_data_free(ef->progtab[i].addr,
855 ef->progtab[i].size);
862 kfree(ef->reltab, M_LINKER);
864 kfree(ef->relatab, M_LINKER);
866 kfree(ef->progtab, M_LINKER);
868 kfree(ef->ctftab, M_LINKER);
870 kfree(ef->ctfoff, M_LINKER);
872 kfree(ef->typoff, M_LINKER);
873 if (file->filename != NULL)
874 preload_delete_name(file->filename);
876 /* XXX reclaim module memory? */
880 for (i = 0; i < ef->nreltab; i++)
881 if (ef->reltab[i].rel)
882 kfree(ef->reltab[i].rel, M_LINKER);
883 for (i = 0; i < ef->nrelatab; i++)
884 if (ef->relatab[i].rela)
885 kfree(ef->relatab[i].rela, M_LINKER);
887 kfree(ef->reltab, M_LINKER);
889 kfree(ef->relatab, M_LINKER);
891 kfree(ef->progtab, M_LINKER);
894 vm_map_remove(&kernel_map, (vm_offset_t) ef->address,
895 (vm_offset_t) ef->address +
896 (ef->object->size << PAGE_SHIFT));
899 kfree(ef->e_shdr, M_LINKER);
901 kfree(ef->ddbsymtab, M_LINKER);
903 kfree(ef->ddbstrtab, M_LINKER);
905 kfree(ef->shstrtab, M_LINKER);
907 kfree(ef->ctftab, M_LINKER);
909 kfree(ef->ctfoff, M_LINKER);
911 kfree(ef->typoff, M_LINKER);
916 symbol_name(elf_file_t ef, Elf_Size r_info)
920 if (ELF_R_SYM(r_info)) {
921 ref = ef->ddbsymtab + ELF_R_SYM(r_info);
922 return ef->ddbstrtab + ref->st_name;
928 findbase(elf_file_t ef, int sec)
933 for (i = 0; i < ef->nprogtab; i++) {
934 if (sec == ef->progtab[i].sec) {
935 base = (Elf_Addr)ef->progtab[i].addr;
943 relocate_file(linker_file_t lf)
945 elf_file_t ef = lf->priv;
946 const Elf_Rel *rellim;
948 const Elf_Rela *relalim;
949 const Elf_Rela *rela;
956 /* Perform relocations without addend if there are any: */
957 for (i = 0; i < ef->nreltab; i++) {
958 rel = ef->reltab[i].rel;
960 panic("lost a reltab!");
961 rellim = rel + ef->reltab[i].nrel;
962 base = findbase(ef, ef->reltab[i].sec);
964 panic("lost base for reltab");
965 for ( ; rel < rellim; rel++) {
966 symidx = ELF_R_SYM(rel->r_info);
967 if (symidx >= ef->ddbsymcnt)
969 sym = ef->ddbsymtab + symidx;
970 /* Local relocs are already done */
971 if (ELF_ST_BIND(sym->st_info) == STB_LOCAL)
973 if (elf_reloc(lf, base, rel, ELF_RELOC_REL,
975 symname = symbol_name(ef, rel->r_info);
976 kprintf("link_elf_obj_obj: symbol %s undefined\n",
983 /* Perform relocations with addend if there are any: */
984 for (i = 0; i < ef->nrelatab; i++) {
985 rela = ef->relatab[i].rela;
987 panic("lost a relatab!");
988 relalim = rela + ef->relatab[i].nrela;
989 base = findbase(ef, ef->relatab[i].sec);
991 panic("lost base for relatab");
992 for ( ; rela < relalim; rela++) {
993 symidx = ELF_R_SYM(rela->r_info);
994 if (symidx >= ef->ddbsymcnt)
996 sym = ef->ddbsymtab + symidx;
997 /* Local relocs are already done */
998 if (ELF_ST_BIND(sym->st_info) == STB_LOCAL)
1000 if (elf_reloc(lf, base, rela, ELF_RELOC_RELA,
1002 symname = symbol_name(ef, rela->r_info);
1003 kprintf("link_elf_obj_obj: symbol %s undefined\n",
1014 link_elf_obj_lookup_symbol(linker_file_t lf, const char *name, c_linker_sym_t *sym)
1016 elf_file_t ef = lf->priv;
1017 const Elf_Sym *symp;
1021 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) {
1022 strp = ef->ddbstrtab + symp->st_name;
1023 if (symp->st_shndx != SHN_UNDEF && strcmp(name, strp) == 0) {
1024 *sym = (c_linker_sym_t) symp;
1032 link_elf_obj_symbol_values(linker_file_t lf, c_linker_sym_t sym,
1033 linker_symval_t *symval)
1035 elf_file_t ef = lf->priv;
1036 const Elf_Sym *es = (const Elf_Sym*) sym;
1038 if (es >= ef->ddbsymtab && es < (ef->ddbsymtab + ef->ddbsymcnt)) {
1039 symval->name = ef->ddbstrtab + es->st_name;
1040 symval->value = (caddr_t)es->st_value;
1041 symval->size = es->st_size;
1048 link_elf_obj_search_symbol(linker_file_t lf, caddr_t value,
1049 c_linker_sym_t *sym, long *diffp)
1051 elf_file_t ef = lf->priv;
1052 u_long off = (uintptr_t) (void *) value;
1056 const Elf_Sym *best = 0;
1059 for (i = 0, es = ef->ddbsymtab; i < ef->ddbsymcnt; i++, es++) {
1060 if (es->st_name == 0)
1062 st_value = es->st_value;
1063 if (off >= st_value) {
1064 if (off - st_value < diff) {
1065 diff = off - st_value;
1069 } else if (off - st_value == diff) {
1078 *sym = (c_linker_sym_t) best;
1084 * Look up a linker set on an ELF system.
1087 link_elf_obj_lookup_set(linker_file_t lf, const char *name,
1088 void ***startp, void ***stopp, int *countp)
1090 elf_file_t ef = lf->priv;
1091 void **start, **stop;
1094 /* Relative to section number */
1095 for (i = 0; i < ef->nprogtab; i++) {
1096 if ((strncmp(ef->progtab[i].name, "set_", 4) == 0) &&
1097 strcmp(ef->progtab[i].name + 4, name) == 0) {
1098 start = (void **)ef->progtab[i].addr;
1099 stop = (void **)((char *)ef->progtab[i].addr +
1100 ef->progtab[i].size);
1101 count = stop - start;
1115 * Symbol lookup function that can be used when the symbol index is known (ie
1116 * in relocations). It uses the symbol index instead of doing a fully fledged
1117 * hash table based lookup when such is valid. For example for local symbols.
1118 * This is not only more efficient, it's also more correct. It's not always
1119 * the case that the symbol can be found through the hash table.
1122 elf_obj_lookup(linker_file_t lf, Elf_Size symidx, int deps, Elf_Addr *result)
1124 elf_file_t ef = lf->priv;
1128 /* Don't even try to lookup the symbol if the index is bogus. */
1129 if (symidx >= ef->ddbsymcnt)
1132 sym = ef->ddbsymtab + symidx;
1134 /* Quick answer if there is a definition included. */
1135 if (sym->st_shndx != SHN_UNDEF) {
1136 *result = sym->st_value;
1140 /* If we get here, then it is undefined and needs a lookup. */
1141 switch (ELF_ST_BIND(sym->st_info)) {
1143 /* Local, but undefined? huh? */
1147 /* Relative to Data or Function name */
1148 symbol = ef->ddbstrtab + sym->st_name;
1150 /* Force a lookup failure if the symbol name is bogus. */
1153 return (linker_file_lookup_symbol(lf, symbol, deps, (caddr_t *)result));
1156 kprintf("link_elf_obj_obj: Weak symbols not supported\n");
1165 link_elf_obj_fix_link_set(elf_file_t ef)
1167 static const char startn[] = "__start_";
1168 static const char stopn[] = "__stop_";
1170 const char *sym_name, *linkset_name;
1171 Elf_Addr startp, stopp;
1176 for (symidx = 1 /* zero entry is special */;
1177 symidx < ef->ddbsymcnt; symidx++) {
1178 sym = ef->ddbsymtab + symidx;
1179 if (sym->st_shndx != SHN_UNDEF)
1182 sym_name = ef->ddbstrtab + sym->st_name;
1183 if (strncmp(sym_name, startn, sizeof(startn) - 1) == 0) {
1185 linkset_name = sym_name + sizeof(startn) - 1;
1187 else if (strncmp(sym_name, stopn, sizeof(stopn) - 1) == 0) {
1189 linkset_name = sym_name + sizeof(stopn) - 1;
1194 for (i = 0; i < ef->nprogtab; i++) {
1195 if (strcmp(ef->progtab[i].name, linkset_name) == 0) {
1196 startp = (Elf_Addr)ef->progtab[i].addr;
1197 stopp = (Elf_Addr)(startp + ef->progtab[i].size);
1201 if (i == ef->nprogtab)
1204 sym->st_value = start ? startp : stopp;
1210 link_elf_obj_reloc_local(linker_file_t lf)
1212 elf_file_t ef = lf->priv;
1213 const Elf_Rel *rellim;
1215 const Elf_Rela *relalim;
1216 const Elf_Rela *rela;
1222 link_elf_obj_fix_link_set(ef);
1224 /* Perform relocations without addend if there are any: */
1225 for (i = 0; i < ef->nreltab; i++) {
1226 rel = ef->reltab[i].rel;
1228 panic("lost a reltab!");
1229 rellim = rel + ef->reltab[i].nrel;
1230 base = findbase(ef, ef->reltab[i].sec);
1232 panic("lost base for reltab");
1233 for ( ; rel < rellim; rel++) {
1234 symidx = ELF_R_SYM(rel->r_info);
1235 if (symidx >= ef->ddbsymcnt)
1237 sym = ef->ddbsymtab + symidx;
1238 /* Only do local relocs */
1239 if (ELF_ST_BIND(sym->st_info) != STB_LOCAL)
1241 elf_reloc_local(lf, base, rel, ELF_RELOC_REL,
1246 /* Perform relocations with addend if there are any: */
1247 for (i = 0; i < ef->nrelatab; i++) {
1248 rela = ef->relatab[i].rela;
1250 panic("lost a relatab!");
1251 relalim = rela + ef->relatab[i].nrela;
1252 base = findbase(ef, ef->relatab[i].sec);
1254 panic("lost base for relatab");
1255 for ( ; rela < relalim; rela++) {
1256 symidx = ELF_R_SYM(rela->r_info);
1257 if (symidx >= ef->ddbsymcnt)
1259 sym = ef->ddbsymtab + symidx;
1260 /* Only do local relocs */
1261 if (ELF_ST_BIND(sym->st_info) != STB_LOCAL)
1263 elf_reloc_local(lf, base, rela, ELF_RELOC_RELA,