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 error = vn_rdwr(UIO_READ, vp, (void *)ef->ddbsymtab,
577 shdr[symtabindex].sh_size, shdr[symtabindex].sh_offset,
578 UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
585 if (symstrindex == -1)
586 panic("lost symbol string index");
587 /* Allocate space for and load the symbol strings */
588 ef->ddbstrcnt = shdr[symstrindex].sh_size;
589 ef->ddbstrtab = kmalloc(shdr[symstrindex].sh_size, M_LINKER, M_WAITOK);
590 error = vn_rdwr(UIO_READ, vp, ef->ddbstrtab,
591 shdr[symstrindex].sh_size, shdr[symstrindex].sh_offset,
592 UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
599 /* Do we have a string table for the section names? */
601 if (hdr->e_shstrndx != 0 &&
602 shdr[hdr->e_shstrndx].sh_type == SHT_STRTAB) {
603 shstrindex = hdr->e_shstrndx;
604 ef->shstrcnt = shdr[shstrindex].sh_size;
605 ef->shstrtab = kmalloc(shdr[shstrindex].sh_size, M_LINKER,
607 error = vn_rdwr(UIO_READ, vp, ef->shstrtab,
608 shdr[shstrindex].sh_size, shdr[shstrindex].sh_offset,
609 UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
617 /* Size up code/data(progbits) and bss(nobits). */
619 for (i = 0; i < hdr->e_shnum; i++) {
620 switch (shdr[i].sh_type) {
623 alignmask = shdr[i].sh_addralign - 1;
626 mapsize += alignmask;
627 mapsize &= ~alignmask;
628 mapsize += shdr[i].sh_size;
634 * We know how much space we need for the text/data/bss/etc. This
635 * stuff needs to be in a single chunk so that profiling etc can get
636 * the bounds and gdb can associate offsets with modules
638 ef->object = vm_object_allocate(OBJT_DEFAULT,
639 round_page(mapsize) >> PAGE_SHIFT);
640 if (ef->object == NULL) {
644 vm_object_hold(ef->object);
645 vm_object_reference_locked(ef->object);
646 ef->address = (caddr_t) vm_map_min(&kernel_map);
650 * In order to satisfy x86_64's architectural requirements on the
651 * location of code and data in the kernel's address space, request a
652 * mapping that is above the kernel.
654 * vkernel64's text+data is outside the managed VM space entirely.
656 #if defined(__x86_64__) && defined(_KERNEL_VIRTUAL)
657 error = vkernel_module_memory_alloc(&mapbase, round_page(mapsize));
658 vm_object_drop(ef->object);
661 error = vm_map_find(&kernel_map, ef->object, NULL,
662 0, &mapbase, round_page(mapsize),
664 TRUE, VM_MAPTYPE_NORMAL,
665 VM_PROT_ALL, VM_PROT_ALL, FALSE);
666 vm_object_drop(ef->object);
668 vm_object_deallocate(ef->object);
673 error = vm_map_wire(&kernel_map, mapbase,
674 mapbase + round_page(mapsize), 0);
676 if (error != KERN_SUCCESS) {
680 /* Inform the kld system about the situation */
681 lf->address = ef->address = (caddr_t) mapbase;
682 lf->size = round_page(mapsize);
686 * Now load code/data(progbits), zero bss(nobits), allocate space for
693 for (i = 0; i < hdr->e_shnum; i++) {
694 switch (shdr[i].sh_type) {
697 alignmask = shdr[i].sh_addralign - 1;
700 mapbase += alignmask;
701 mapbase &= ~alignmask;
702 if (ef->shstrtab && shdr[i].sh_name != 0)
703 ef->progtab[pb].name =
704 ef->shstrtab + shdr[i].sh_name;
705 else if (shdr[i].sh_type == SHT_PROGBITS)
706 ef->progtab[pb].name = "<<PROGBITS>>";
708 ef->progtab[pb].name = "<<NOBITS>>";
710 if (ef->progtab[pb].name != NULL &&
711 !strcmp(ef->progtab[pb].name, "set_pcpu"))
712 ef->progtab[pb].addr =
713 dpcpu_alloc(shdr[i].sh_size);
715 else if (ef->progtab[pb].name != NULL &&
716 !strcmp(ef->progtab[pb].name, VNET_SETNAME))
717 ef->progtab[pb].addr =
718 vnet_data_alloc(shdr[i].sh_size);
722 ef->progtab[pb].addr =
723 (void *)(uintptr_t) mapbase;
724 if (ef->progtab[pb].addr == NULL) {
728 ef->progtab[pb].size = shdr[i].sh_size;
729 ef->progtab[pb].sec = i;
730 if (shdr[i].sh_type == SHT_PROGBITS) {
731 error = vn_rdwr(UIO_READ, vp,
732 ef->progtab[pb].addr,
733 shdr[i].sh_size, shdr[i].sh_offset,
734 UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred,
743 /* Initialize the per-cpu or vnet area. */
744 if (ef->progtab[pb].addr != (void *)mapbase &&
745 !strcmp(ef->progtab[pb].name, "set_pcpu"))
746 dpcpu_copy(ef->progtab[pb].addr,
749 else if (ef->progtab[pb].addr !=
751 !strcmp(ef->progtab[pb].name, VNET_SETNAME))
752 vnet_data_copy(ef->progtab[pb].addr,
757 bzero(ef->progtab[pb].addr, shdr[i].sh_size);
759 /* Update all symbol values with the offset. */
760 for (j = 0; j < ef->ddbsymcnt; j++) {
761 es = &ef->ddbsymtab[j];
762 if (es->st_shndx != i)
764 es->st_value += (Elf_Addr) ef->progtab[pb].addr;
766 mapbase += shdr[i].sh_size;
770 ef->reltab[rl].rel = kmalloc(shdr[i].sh_size, M_LINKER, M_WAITOK);
771 ef->reltab[rl].nrel = shdr[i].sh_size / sizeof(Elf_Rel);
772 ef->reltab[rl].sec = shdr[i].sh_info;
773 error = vn_rdwr(UIO_READ, vp,
774 (void *)ef->reltab[rl].rel,
775 shdr[i].sh_size, shdr[i].sh_offset,
776 UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
786 ef->relatab[ra].rela = kmalloc(shdr[i].sh_size, M_LINKER, M_WAITOK);
787 ef->relatab[ra].nrela = shdr[i].sh_size / sizeof(Elf_Rela);
788 ef->relatab[ra].sec = shdr[i].sh_info;
789 error = vn_rdwr(UIO_READ, vp,
790 (void *)ef->relatab[ra].rela,
791 shdr[i].sh_size, shdr[i].sh_offset,
792 UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
803 if (pb != ef->nprogtab)
804 panic("lost progbits");
805 if (rl != ef->nreltab)
806 panic("lost reltab");
807 if (ra != ef->nrelatab)
808 panic("lost relatab");
809 if (mapbase != (vm_offset_t) ef->address + mapsize)
810 panic("mapbase 0x%lx != address %p + mapsize 0x%lx (0x%lx)",
811 mapbase, ef->address, mapsize,
812 (vm_offset_t) ef->address + mapsize);
814 /* Local intra-module relocations */
815 link_elf_obj_reloc_local(lf);
817 /* Pull in dependencies */
818 error = linker_load_dependencies(lf);
822 /* External relocations */
823 error = relocate_file(lf);
831 linker_file_unload(lf /*, LINKER_UNLOAD_FORCE */);
833 kfree(hdr, M_LINKER);
835 vn_close(vp, FREAD, NULL);
841 link_elf_obj_unload_file(linker_file_t file)
843 elf_file_t ef = file->priv;
847 for (i = 0; i < ef->nprogtab; i++) {
848 if (ef->progtab[i].size == 0)
850 if (ef->progtab[i].name == NULL)
853 if (!strcmp(ef->progtab[i].name, "set_pcpu"))
854 dpcpu_free(ef->progtab[i].addr,
855 ef->progtab[i].size);
857 else if (!strcmp(ef->progtab[i].name, VNET_SETNAME))
858 vnet_data_free(ef->progtab[i].addr,
859 ef->progtab[i].size);
866 kfree(ef->reltab, M_LINKER);
868 kfree(ef->relatab, M_LINKER);
870 kfree(ef->progtab, M_LINKER);
872 kfree(ef->ctftab, M_LINKER);
874 kfree(ef->ctfoff, M_LINKER);
876 kfree(ef->typoff, M_LINKER);
877 if (file->filename != NULL)
878 preload_delete_name(file->filename);
880 /* XXX reclaim module memory? */
884 for (i = 0; i < ef->nreltab; i++)
885 if (ef->reltab[i].rel)
886 kfree(ef->reltab[i].rel, M_LINKER);
887 for (i = 0; i < ef->nrelatab; i++)
888 if (ef->relatab[i].rela)
889 kfree(ef->relatab[i].rela, M_LINKER);
891 kfree(ef->reltab, M_LINKER);
893 kfree(ef->relatab, M_LINKER);
895 kfree(ef->progtab, M_LINKER);
898 #if defined(__x86_64__) && defined(_KERNEL_VIRTUAL)
899 vkernel_module_memory_free((vm_offset_t)ef->address, ef->bytes);
901 vm_map_remove(&kernel_map, (vm_offset_t) ef->address,
902 (vm_offset_t) ef->address +
903 (ef->object->size << PAGE_SHIFT));
905 vm_object_deallocate(ef->object);
909 kfree(ef->e_shdr, M_LINKER);
911 kfree(ef->ddbsymtab, M_LINKER);
913 kfree(ef->ddbstrtab, M_LINKER);
915 kfree(ef->shstrtab, M_LINKER);
917 kfree(ef->ctftab, M_LINKER);
919 kfree(ef->ctfoff, M_LINKER);
921 kfree(ef->typoff, M_LINKER);
926 symbol_name(elf_file_t ef, Elf_Size r_info)
930 if (ELF_R_SYM(r_info)) {
931 ref = ef->ddbsymtab + ELF_R_SYM(r_info);
932 return ef->ddbstrtab + ref->st_name;
938 findbase(elf_file_t ef, int sec)
943 for (i = 0; i < ef->nprogtab; i++) {
944 if (sec == ef->progtab[i].sec) {
945 base = (Elf_Addr)ef->progtab[i].addr;
953 relocate_file(linker_file_t lf)
955 elf_file_t ef = lf->priv;
956 const Elf_Rel *rellim;
958 const Elf_Rela *relalim;
959 const Elf_Rela *rela;
966 /* Perform relocations without addend if there are any: */
967 for (i = 0; i < ef->nreltab; i++) {
968 rel = ef->reltab[i].rel;
970 panic("lost a reltab!");
971 rellim = rel + ef->reltab[i].nrel;
972 base = findbase(ef, ef->reltab[i].sec);
974 panic("lost base for reltab");
975 for ( ; rel < rellim; rel++) {
976 symidx = ELF_R_SYM(rel->r_info);
977 if (symidx >= ef->ddbsymcnt)
979 sym = ef->ddbsymtab + symidx;
980 /* Local relocs are already done */
981 if (ELF_ST_BIND(sym->st_info) == STB_LOCAL)
983 if (elf_reloc(lf, base, rel, ELF_RELOC_REL,
985 symname = symbol_name(ef, rel->r_info);
986 kprintf("link_elf_obj_obj: symbol %s undefined\n",
993 /* Perform relocations with addend if there are any: */
994 for (i = 0; i < ef->nrelatab; i++) {
995 rela = ef->relatab[i].rela;
997 panic("lost a relatab!");
998 relalim = rela + ef->relatab[i].nrela;
999 base = findbase(ef, ef->relatab[i].sec);
1001 panic("lost base for relatab");
1002 for ( ; rela < relalim; rela++) {
1003 symidx = ELF_R_SYM(rela->r_info);
1004 if (symidx >= ef->ddbsymcnt)
1006 sym = ef->ddbsymtab + symidx;
1007 /* Local relocs are already done */
1008 if (ELF_ST_BIND(sym->st_info) == STB_LOCAL)
1010 if (elf_reloc(lf, base, rela, ELF_RELOC_RELA,
1012 symname = symbol_name(ef, rela->r_info);
1013 kprintf("link_elf_obj_obj: symbol %s undefined\n",
1024 link_elf_obj_lookup_symbol(linker_file_t lf, const char *name, c_linker_sym_t *sym)
1026 elf_file_t ef = lf->priv;
1027 const Elf_Sym *symp;
1031 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) {
1032 strp = ef->ddbstrtab + symp->st_name;
1033 if (symp->st_shndx != SHN_UNDEF && strcmp(name, strp) == 0) {
1034 *sym = (c_linker_sym_t) symp;
1042 link_elf_obj_symbol_values(linker_file_t lf, c_linker_sym_t sym,
1043 linker_symval_t *symval)
1045 elf_file_t ef = lf->priv;
1046 const Elf_Sym *es = (const Elf_Sym*) sym;
1048 if (es >= ef->ddbsymtab && es < (ef->ddbsymtab + ef->ddbsymcnt)) {
1049 symval->name = ef->ddbstrtab + es->st_name;
1050 symval->value = (caddr_t)es->st_value;
1051 symval->size = es->st_size;
1058 link_elf_obj_search_symbol(linker_file_t lf, caddr_t value,
1059 c_linker_sym_t *sym, long *diffp)
1061 elf_file_t ef = lf->priv;
1062 u_long off = (uintptr_t) (void *) value;
1066 const Elf_Sym *best = NULL;
1069 for (i = 0, es = ef->ddbsymtab; i < ef->ddbsymcnt; i++, es++) {
1070 if (es->st_name == 0)
1072 st_value = es->st_value;
1073 if (off >= st_value) {
1074 if (off - st_value < diff) {
1075 diff = off - st_value;
1079 } else if (off - st_value == diff) {
1088 *sym = (c_linker_sym_t) best;
1094 * Look up a linker set on an ELF system.
1097 link_elf_obj_lookup_set(linker_file_t lf, const char *name,
1098 void ***startp, void ***stopp, int *countp)
1100 elf_file_t ef = lf->priv;
1101 void **start, **stop;
1104 /* Relative to section number */
1105 for (i = 0; i < ef->nprogtab; i++) {
1106 if ((strncmp(ef->progtab[i].name, "set_", 4) == 0) &&
1107 strcmp(ef->progtab[i].name + 4, name) == 0) {
1108 start = (void **)ef->progtab[i].addr;
1109 stop = (void **)((char *)ef->progtab[i].addr +
1110 ef->progtab[i].size);
1111 count = stop - start;
1125 * Symbol lookup function that can be used when the symbol index is known (ie
1126 * in relocations). It uses the symbol index instead of doing a fully fledged
1127 * hash table based lookup when such is valid. For example for local symbols.
1128 * This is not only more efficient, it's also more correct. It's not always
1129 * the case that the symbol can be found through the hash table.
1132 elf_obj_lookup(linker_file_t lf, Elf_Size symidx, int deps, Elf_Addr *result)
1134 elf_file_t ef = lf->priv;
1138 /* Don't even try to lookup the symbol if the index is bogus. */
1139 if (symidx >= ef->ddbsymcnt)
1142 sym = ef->ddbsymtab + symidx;
1144 /* Quick answer if there is a definition included. */
1145 if (sym->st_shndx != SHN_UNDEF) {
1146 *result = sym->st_value;
1150 /* If we get here, then it is undefined and needs a lookup. */
1151 switch (ELF_ST_BIND(sym->st_info)) {
1153 /* Local, but undefined? huh? */
1157 /* Relative to Data or Function name */
1158 symbol = ef->ddbstrtab + sym->st_name;
1160 /* Force a lookup failure if the symbol name is bogus. */
1163 return (linker_file_lookup_symbol(lf, symbol, deps, (caddr_t *)result));
1166 kprintf("link_elf_obj_obj: Weak symbols not supported\n");
1175 link_elf_obj_fix_link_set(elf_file_t ef)
1177 static const char startn[] = "__start_";
1178 static const char stopn[] = "__stop_";
1180 const char *sym_name, *linkset_name;
1181 Elf_Addr startp, stopp;
1186 for (symidx = 1 /* zero entry is special */;
1187 symidx < ef->ddbsymcnt; symidx++) {
1188 sym = ef->ddbsymtab + symidx;
1189 if (sym->st_shndx != SHN_UNDEF)
1192 sym_name = ef->ddbstrtab + sym->st_name;
1193 if (strncmp(sym_name, startn, sizeof(startn) - 1) == 0) {
1195 linkset_name = sym_name + sizeof(startn) - 1;
1197 else if (strncmp(sym_name, stopn, sizeof(stopn) - 1) == 0) {
1199 linkset_name = sym_name + sizeof(stopn) - 1;
1204 for (i = 0; i < ef->nprogtab; i++) {
1205 if (strcmp(ef->progtab[i].name, linkset_name) == 0) {
1206 startp = (Elf_Addr)ef->progtab[i].addr;
1207 stopp = (Elf_Addr)(startp + ef->progtab[i].size);
1211 if (i == ef->nprogtab)
1214 sym->st_value = start ? startp : stopp;
1220 link_elf_obj_reloc_local(linker_file_t lf)
1222 elf_file_t ef = lf->priv;
1223 const Elf_Rel *rellim;
1225 const Elf_Rela *relalim;
1226 const Elf_Rela *rela;
1232 link_elf_obj_fix_link_set(ef);
1234 /* Perform relocations without addend if there are any: */
1235 for (i = 0; i < ef->nreltab; i++) {
1236 rel = ef->reltab[i].rel;
1238 panic("lost a reltab!");
1239 rellim = rel + ef->reltab[i].nrel;
1240 base = findbase(ef, ef->reltab[i].sec);
1242 panic("lost base for reltab");
1243 for ( ; rel < rellim; rel++) {
1244 symidx = ELF_R_SYM(rel->r_info);
1245 if (symidx >= ef->ddbsymcnt)
1247 sym = ef->ddbsymtab + symidx;
1248 /* Only do local relocs */
1249 if (ELF_ST_BIND(sym->st_info) != STB_LOCAL)
1251 elf_reloc_local(lf, base, rel, ELF_RELOC_REL,
1256 /* Perform relocations with addend if there are any: */
1257 for (i = 0; i < ef->nrelatab; i++) {
1258 rela = ef->relatab[i].rela;
1260 panic("lost a relatab!");
1261 relalim = rela + ef->relatab[i].nrela;
1262 base = findbase(ef, ef->relatab[i].sec);
1264 panic("lost base for relatab");
1265 for ( ; rela < relalim; rela++) {
1266 symidx = ELF_R_SYM(rela->r_info);
1267 if (symidx >= ef->ddbsymcnt)
1269 sym = ef->ddbsymtab + symidx;
1270 /* Only do local relocs */
1271 if (ELF_ST_BIND(sym->st_info) != STB_LOCAL)
1273 elf_reloc_local(lf, base, rela, ELF_RELOC_RELA,