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 $
30 #include <sys/param.h>
31 #include <sys/kernel.h>
32 #include <sys/systm.h>
33 #include <sys/malloc.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>
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>
49 #include <vm/vm_map.h>
51 static int link_elf_obj_preload_file(const char *, linker_file_t *);
52 static int link_elf_obj_preload_finish(linker_file_t);
53 static int link_elf_obj_load_file(const char *, linker_file_t *);
55 link_elf_obj_lookup_symbol(linker_file_t, const char *,
57 static int link_elf_obj_symbol_values(linker_file_t, c_linker_sym_t, linker_symval_t *);
59 link_elf_obj_search_symbol(linker_file_t, caddr_t value,
60 c_linker_sym_t * sym, long *diffp);
62 static void link_elf_obj_unload_file(linker_file_t);
64 link_elf_obj_lookup_set(linker_file_t, const char *,
65 void ***, void ***, int *);
66 static void link_elf_obj_reloc_local(linker_file_t lf);
67 static int elf_obj_lookup(linker_file_t lf, Elf_Size symidx, int deps, Elf_Addr *);
69 static struct linker_class_ops link_elf_obj_class_ops = {
70 link_elf_obj_load_file,
71 link_elf_obj_preload_file,
74 static 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,
87 int sec; /* Original section */
104 typedef struct elf_file {
107 caddr_t address; /* Relocation address */
108 size_t bytes; /* Chunk size in bytes */
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;
202 lf = linker_make_file(filename, ef, &link_elf_obj_file_ops);
207 lf->address = ef->address;
208 lf->size = *(size_t *) sizeptr;
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) {
221 /* Scan the section header for information and table sizing. */
224 for (i = 0; i < hdr->e_shnum; i++) {
225 switch (shdr[i].sh_type) {
232 symstrindex = shdr[i].sh_link;
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) {
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)) {
268 /* XXX, relocate the sh_addr fields saved by the loader. */
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;
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;
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;
287 /* Now fill out progtab and the relocation tables. */
291 for (i = 0; i < hdr->e_shnum; i++) {
292 switch (shdr[i].sh_type) {
295 ef->progtab[pb].addr = (void *)shdr[i].sh_addr;
296 if (shdr[i].sh_type == SHT_PROGBITS)
297 ef->progtab[pb].name = "<<PROGBITS>>";
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;
306 if (ef->progtab[pb].name != NULL &&
307 !strcmp(ef->progtab[pb].name, "set_pcpu")) {
310 dpcpu = dpcpu_alloc(shdr[i].sh_size);
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;
320 } else if (ef->progtab[pb].name != NULL &&
321 !strcmp(ef->progtab[pb].name, VNET_SETNAME)) {
324 vnet_data = vnet_data_alloc(shdr[i].sh_size);
325 if (vnet_data == NULL) {
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;
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)
341 es->st_value += (Elf_Addr) ef->progtab[pb].addr;
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;
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;
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");
367 /* Local intra-module relocations */
368 link_elf_obj_reloc_local(lf);
374 /* preload not done this way */
375 linker_file_unload(lf /* , LINKER_UNLOAD_FORCE */ );
380 link_elf_obj_preload_finish(linker_file_t lf)
384 error = relocate_file(lf);
390 link_elf_obj_load_file(const char *filename, linker_file_t * result)
392 struct nlookupdata nd;
393 struct thread *td = curthread; /* XXX */
394 struct proc *p = td->td_proc;
414 /* XXX Hack for firmware loading where 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);
429 pathname = linker_search_path(filename);
430 if (pathname == NULL)
433 error = nlookup_init(&nd, pathname, UIO_SYSSPACE, NLC_FOLLOW | NLC_LOCKVP);
435 error = vn_open(&nd, NULL, FREAD, 0);
436 kfree(pathname, M_LINKER);
442 nd.nl_open_vp = NULL;
446 * Read the elf header from the file.
448 hdr = kmalloc(sizeof(*hdr), M_LINKER, M_WAITOK);
449 error = vn_rdwr(UIO_READ, vp, (void *)hdr, sizeof(*hdr), 0,
450 UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
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");
468 if (hdr->e_ident[EI_VERSION] != EV_CURRENT
469 || hdr->e_version != EV_CURRENT) {
470 link_elf_obj_error(filename, "Unsupported file version");
474 if (hdr->e_type != ET_REL) {
478 if (hdr->e_machine != ELF_TARG_MACH) {
479 link_elf_obj_error(filename, "Unsupported machine");
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);
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)) {
503 shdr = kmalloc(nbytes, M_LINKER, M_WAITOK);
505 error = vn_rdwr(UIO_READ, vp, (caddr_t) shdr, nbytes, hdr->e_shoff,
506 UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
513 /* Scan the section header for information and table sizing. */
517 for (i = 0; i < hdr->e_shnum; i++) {
518 switch (shdr[i].sh_type) {
526 symstrindex = shdr[i].sh_link;
538 if (ef->nprogtab == 0) {
539 link_elf_obj_error(filename, "file has no contents");
544 /* Only allow one symbol table for now */
545 link_elf_obj_error(filename, "file has no valid symbol table");
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");
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)) {
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) {
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);
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) {
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);
607 /* Do we have a string table for the section names? */
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,
615 if (ef->shstrtab == NULL) {
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);
629 /* Size up code/data(progbits) and bss(nobits). */
631 for (i = 0; i < hdr->e_shnum; i++) {
632 switch (shdr[i].sh_type) {
635 alignmask = shdr[i].sh_addralign - 1;
636 mapsize += alignmask;
637 mapsize &= ~alignmask;
638 mapsize += shdr[i].sh_size;
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
648 ef->object = vm_object_allocate(OBJT_DEFAULT,
649 round_page(mapsize) >> PAGE_SHIFT);
650 if (ef->object == NULL) {
654 vm_object_hold(ef->object);
655 vm_object_reference_locked(ef->object);
656 ef->address = (caddr_t) vm_map_min(&kernel_map);
660 * In order to satisfy x86_64's architectural requirements on the
661 * location of code and data in the kernel's address space, request a
662 * mapping that is above the kernel.
664 * vkernel64's text+data is outside the managed VM space entirely.
666 #if defined(__amd64__) && defined(_KERNEL_VIRTUAL)
667 error = vkernel_module_memory_alloc(&mapbase, round_page(mapsize));
670 error = vm_map_find(&kernel_map, ef->object, 0, &mapbase,
671 round_page(mapsize), PAGE_SIZE,
672 TRUE, VM_MAPTYPE_NORMAL,
673 VM_PROT_ALL, VM_PROT_ALL, FALSE);
674 vm_object_drop(ef->object);
676 vm_object_deallocate(ef->object);
681 error = vm_map_wire(&kernel_map, mapbase,
682 mapbase + round_page(mapsize), 0);
684 if (error != KERN_SUCCESS) {
688 /* Inform the kld system about the situation */
689 lf->address = ef->address = (caddr_t) mapbase;
690 lf->size = round_page(mapsize);
694 * Now load code/data(progbits), zero bss(nobits), allocate space for
701 for (i = 0; i < hdr->e_shnum; i++) {
702 switch (shdr[i].sh_type) {
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>>";
714 ef->progtab[pb].name = "<<NOBITS>>";
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);
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);
728 ef->progtab[pb].addr =
729 (void *)(uintptr_t) mapbase;
730 if (ef->progtab[pb].addr == NULL) {
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,
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,
755 else if (ef->progtab[pb].addr !=
757 !strcmp(ef->progtab[pb].name, VNET_SETNAME))
758 vnet_data_copy(ef->progtab[pb].addr,
763 bzero(ef->progtab[pb].addr, shdr[i].sh_size);
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)
770 es->st_value += (Elf_Addr) ef->progtab[pb].addr;
772 mapbase += shdr[i].sh_size;
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);
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);
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);
820 /* Local intra-module relocations */
821 link_elf_obj_reloc_local(lf);
823 /* Pull in dependencies */
824 error = linker_load_dependencies(lf);
828 /* External relocations */
829 error = relocate_file(lf);
837 linker_file_unload(lf /*, LINKER_UNLOAD_FORCE */);
839 kfree(hdr, M_LINKER);
847 link_elf_obj_unload_file(linker_file_t file)
849 elf_file_t ef = file->priv;
853 for (i = 0; i < ef->nprogtab; i++) {
854 if (ef->progtab[i].size == 0)
856 if (ef->progtab[i].name == NULL)
859 if (!strcmp(ef->progtab[i].name, "set_pcpu"))
860 dpcpu_free(ef->progtab[i].addr,
861 ef->progtab[i].size);
863 else if (!strcmp(ef->progtab[i].name, VNET_SETNAME))
864 vnet_data_free(ef->progtab[i].addr,
865 ef->progtab[i].size);
872 kfree(ef->reltab, M_LINKER);
874 kfree(ef->relatab, M_LINKER);
876 kfree(ef->progtab, M_LINKER);
878 kfree(ef->ctftab, M_LINKER);
880 kfree(ef->ctfoff, M_LINKER);
882 kfree(ef->typoff, M_LINKER);
883 if (file->filename != NULL)
884 preload_delete_name(file->filename);
886 /* XXX reclaim module memory? */
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);
897 kfree(ef->reltab, M_LINKER);
899 kfree(ef->relatab, M_LINKER);
901 kfree(ef->progtab, M_LINKER);
904 #if defined(__amd64__) && defined(_KERNEL_VIRTUAL)
905 vkernel_module_memory_free((vm_offset_t)ef->address, ef->bytes);
907 vm_map_remove(&kernel_map, (vm_offset_t) ef->address,
908 (vm_offset_t) ef->address +
909 (ef->object->size << PAGE_SHIFT));
911 vm_object_deallocate(ef->object);
915 kfree(ef->e_shdr, M_LINKER);
917 kfree(ef->ddbsymtab, M_LINKER);
919 kfree(ef->ddbstrtab, M_LINKER);
921 kfree(ef->shstrtab, M_LINKER);
923 kfree(ef->ctftab, M_LINKER);
925 kfree(ef->ctfoff, M_LINKER);
927 kfree(ef->typoff, M_LINKER);
932 symbol_name(elf_file_t ef, Elf_Size r_info)
936 if (ELF_R_SYM(r_info)) {
937 ref = ef->ddbsymtab + ELF_R_SYM(r_info);
938 return ef->ddbstrtab + ref->st_name;
944 findbase(elf_file_t ef, int sec)
949 for (i = 0; i < ef->nprogtab; i++) {
950 if (sec == ef->progtab[i].sec) {
951 base = (Elf_Addr)ef->progtab[i].addr;
959 relocate_file(linker_file_t lf)
961 elf_file_t ef = lf->priv;
962 const Elf_Rel *rellim;
964 const Elf_Rela *relalim;
965 const Elf_Rela *rela;
972 /* Perform relocations without addend if there are any: */
973 for (i = 0; i < ef->nreltab; i++) {
974 rel = ef->reltab[i].rel;
976 panic("lost a reltab!");
977 rellim = rel + ef->reltab[i].nrel;
978 base = findbase(ef, ef->reltab[i].sec);
980 panic("lost base for reltab");
981 for ( ; rel < rellim; rel++) {
982 symidx = ELF_R_SYM(rel->r_info);
983 if (symidx >= ef->ddbsymcnt)
985 sym = ef->ddbsymtab + symidx;
986 /* Local relocs are already done */
987 if (ELF_ST_BIND(sym->st_info) == STB_LOCAL)
989 if (elf_reloc(lf, base, rel, ELF_RELOC_REL,
991 symname = symbol_name(ef, rel->r_info);
992 kprintf("link_elf_obj_obj: symbol %s undefined\n",
999 /* Perform relocations with addend if there are any: */
1000 for (i = 0; i < ef->nrelatab; i++) {
1001 rela = ef->relatab[i].rela;
1003 panic("lost a relatab!");
1004 relalim = rela + ef->relatab[i].nrela;
1005 base = findbase(ef, ef->relatab[i].sec);
1007 panic("lost base for relatab");
1008 for ( ; rela < relalim; rela++) {
1009 symidx = ELF_R_SYM(rela->r_info);
1010 if (symidx >= ef->ddbsymcnt)
1012 sym = ef->ddbsymtab + symidx;
1013 /* Local relocs are already done */
1014 if (ELF_ST_BIND(sym->st_info) == STB_LOCAL)
1016 if (elf_reloc(lf, base, rela, ELF_RELOC_RELA,
1018 symname = symbol_name(ef, rela->r_info);
1019 kprintf("link_elf_obj_obj: symbol %s undefined\n",
1030 link_elf_obj_lookup_symbol(linker_file_t lf, const char *name, c_linker_sym_t *sym)
1032 elf_file_t ef = lf->priv;
1033 const Elf_Sym *symp;
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;
1048 link_elf_obj_symbol_values(linker_file_t lf, c_linker_sym_t sym,
1049 linker_symval_t *symval)
1051 elf_file_t ef = lf->priv;
1052 const Elf_Sym *es = (const Elf_Sym*) sym;
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;
1064 link_elf_obj_search_symbol(linker_file_t lf, caddr_t value,
1065 c_linker_sym_t *sym, long *diffp)
1067 elf_file_t ef = lf->priv;
1068 u_long off = (uintptr_t) (void *) value;
1072 const Elf_Sym *best = NULL;
1075 for (i = 0, es = ef->ddbsymtab; i < ef->ddbsymcnt; i++, es++) {
1076 if (es->st_name == 0)
1078 st_value = es->st_value;
1079 if (off >= st_value) {
1080 if (off - st_value < diff) {
1081 diff = off - st_value;
1085 } else if (off - st_value == diff) {
1094 *sym = (c_linker_sym_t) best;
1100 * Look up a linker set on an ELF system.
1103 link_elf_obj_lookup_set(linker_file_t lf, const char *name,
1104 void ***startp, void ***stopp, int *countp)
1106 elf_file_t ef = lf->priv;
1107 void **start, **stop;
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;
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.
1138 elf_obj_lookup(linker_file_t lf, Elf_Size symidx, int deps, Elf_Addr *result)
1140 elf_file_t ef = lf->priv;
1144 /* Don't even try to lookup the symbol if the index is bogus. */
1145 if (symidx >= ef->ddbsymcnt)
1148 sym = ef->ddbsymtab + symidx;
1150 /* Quick answer if there is a definition included. */
1151 if (sym->st_shndx != SHN_UNDEF) {
1152 *result = sym->st_value;
1156 /* If we get here, then it is undefined and needs a lookup. */
1157 switch (ELF_ST_BIND(sym->st_info)) {
1159 /* Local, but undefined? huh? */
1163 /* Relative to Data or Function name */
1164 symbol = ef->ddbstrtab + sym->st_name;
1166 /* Force a lookup failure if the symbol name is bogus. */
1169 return (linker_file_lookup_symbol(lf, symbol, deps, (caddr_t *)result));
1172 kprintf("link_elf_obj_obj: Weak symbols not supported\n");
1181 link_elf_obj_fix_link_set(elf_file_t ef)
1183 static const char startn[] = "__start_";
1184 static const char stopn[] = "__stop_";
1186 const char *sym_name, *linkset_name;
1187 Elf_Addr startp, stopp;
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)
1198 sym_name = ef->ddbstrtab + sym->st_name;
1199 if (strncmp(sym_name, startn, sizeof(startn) - 1) == 0) {
1201 linkset_name = sym_name + sizeof(startn) - 1;
1203 else if (strncmp(sym_name, stopn, sizeof(stopn) - 1) == 0) {
1205 linkset_name = sym_name + sizeof(stopn) - 1;
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);
1217 if (i == ef->nprogtab)
1220 sym->st_value = start ? startp : stopp;
1226 link_elf_obj_reloc_local(linker_file_t lf)
1228 elf_file_t ef = lf->priv;
1229 const Elf_Rel *rellim;
1231 const Elf_Rela *relalim;
1232 const Elf_Rela *rela;
1238 link_elf_obj_fix_link_set(ef);
1240 /* Perform relocations without addend if there are any: */
1241 for (i = 0; i < ef->nreltab; i++) {
1242 rel = ef->reltab[i].rel;
1244 panic("lost a reltab!");
1245 rellim = rel + ef->reltab[i].nrel;
1246 base = findbase(ef, ef->reltab[i].sec);
1248 panic("lost base for reltab");
1249 for ( ; rel < rellim; rel++) {
1250 symidx = ELF_R_SYM(rel->r_info);
1251 if (symidx >= ef->ddbsymcnt)
1253 sym = ef->ddbsymtab + symidx;
1254 /* Only do local relocs */
1255 if (ELF_ST_BIND(sym->st_info) != STB_LOCAL)
1257 elf_reloc_local(lf, base, rel, ELF_RELOC_REL,
1262 /* Perform relocations with addend if there are any: */
1263 for (i = 0; i < ef->nrelatab; i++) {
1264 rela = ef->relatab[i].rela;
1266 panic("lost a relatab!");
1267 relalim = rela + ef->relatab[i].nrela;
1268 base = findbase(ef, ef->relatab[i].sec);
1270 panic("lost base for relatab");
1271 for ( ; rela < relalim; rela++) {
1272 symidx = ELF_R_SYM(rela->r_info);
1273 if (symidx >= ef->ddbsymcnt)
1275 sym = ef->ddbsymtab + symidx;
1276 /* Only do local relocs */
1277 if (ELF_ST_BIND(sym->st_info) != STB_LOCAL)
1279 elf_reloc_local(lf, base, rela, ELF_RELOC_RELA,