2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 1998-2000 Doug Rabson
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
35 #include <sys/param.h>
36 #include <sys/systm.h>
40 #include <sys/kernel.h>
42 #include <sys/malloc.h>
46 #include <sys/mutex.h>
47 #include <sys/mount.h>
50 #include <sys/namei.h>
51 #include <sys/fcntl.h>
52 #include <sys/vnode.h>
53 #include <sys/linker.h>
55 #include <machine/elf.h>
59 #include <security/mac/mac_framework.h>
62 #include <vm/vm_param.h>
64 #include <vm/vm_object.h>
65 #include <vm/vm_kern.h>
66 #include <vm/vm_extern.h>
69 #include <vm/vm_map.h>
71 #include <sys/link_elf.h>
73 #include "linker_if.h"
77 typedef struct elf_file {
78 struct linker_file lf; /* Common fields */
79 int preloaded; /* Was file pre-loaded */
80 caddr_t address; /* Relocation address */
82 vm_object_t object; /* VM object to hold file pages */
84 Elf_Dyn *dynamic; /* Symbol table etc. */
85 Elf_Hashelt nbuckets; /* DT_HASH info */
87 const Elf_Hashelt *buckets;
88 const Elf_Hashelt *chains;
90 caddr_t strtab; /* DT_STRTAB */
91 int strsz; /* DT_STRSZ */
92 const Elf_Sym *symtab; /* DT_SYMTAB */
93 Elf_Addr *got; /* DT_PLTGOT */
94 const Elf_Rel *pltrel; /* DT_JMPREL */
95 int pltrelsize; /* DT_PLTRELSZ */
96 const Elf_Rela *pltrela; /* DT_JMPREL */
97 int pltrelasize; /* DT_PLTRELSZ */
98 const Elf_Rel *rel; /* DT_REL */
99 int relsize; /* DT_RELSZ */
100 const Elf_Rela *rela; /* DT_RELA */
101 int relasize; /* DT_RELASZ */
103 const Elf_Sym *ddbsymtab; /* The symbol table we are using */
104 long ddbsymcnt; /* Number of symbols */
105 caddr_t ddbstrtab; /* String table */
106 long ddbstrcnt; /* number of bytes in string table */
107 caddr_t symbase; /* malloc'ed symbold base */
108 caddr_t strbase; /* malloc'ed string base */
109 caddr_t ctftab; /* CTF table */
110 long ctfcnt; /* number of bytes in CTF table */
111 caddr_t ctfoff; /* CTF offset table */
112 caddr_t typoff; /* Type offset table */
113 long typlen; /* Number of type entries. */
114 Elf_Addr pcpu_start; /* Pre-relocation pcpu set start. */
115 Elf_Addr pcpu_stop; /* Pre-relocation pcpu set stop. */
116 Elf_Addr pcpu_base; /* Relocated pcpu set address. */
118 Elf_Addr vnet_start; /* Pre-relocation vnet set start. */
119 Elf_Addr vnet_stop; /* Pre-relocation vnet set stop. */
120 Elf_Addr vnet_base; /* Relocated vnet set address. */
123 struct link_map gdb; /* hooks for gdb */
131 TAILQ_ENTRY(elf_set) es_link;
134 TAILQ_HEAD(elf_set_head, elf_set);
136 #include <kern/kern_ctf.c>
138 static int link_elf_link_common_finish(linker_file_t);
139 static int link_elf_link_preload(linker_class_t cls,
140 const char *, linker_file_t *);
141 static int link_elf_link_preload_finish(linker_file_t);
142 static int link_elf_load_file(linker_class_t, const char *,
144 static int link_elf_lookup_symbol(linker_file_t, const char *,
146 static int link_elf_symbol_values(linker_file_t, c_linker_sym_t,
148 static int link_elf_search_symbol(linker_file_t, caddr_t,
149 c_linker_sym_t *, long *);
151 static void link_elf_unload_file(linker_file_t);
152 static void link_elf_unload_preload(linker_file_t);
153 static int link_elf_lookup_set(linker_file_t, const char *,
154 void ***, void ***, int *);
155 static int link_elf_each_function_name(linker_file_t,
156 int (*)(const char *, void *), void *);
157 static int link_elf_each_function_nameval(linker_file_t,
158 linker_function_nameval_callback_t, void *);
159 static void link_elf_reloc_local(linker_file_t);
160 static long link_elf_symtab_get(linker_file_t, const Elf_Sym **);
161 static long link_elf_strtab_get(linker_file_t, caddr_t *);
162 static int elf_lookup(linker_file_t, Elf_Size, int, Elf_Addr *);
164 static kobj_method_t link_elf_methods[] = {
165 KOBJMETHOD(linker_lookup_symbol, link_elf_lookup_symbol),
166 KOBJMETHOD(linker_symbol_values, link_elf_symbol_values),
167 KOBJMETHOD(linker_search_symbol, link_elf_search_symbol),
168 KOBJMETHOD(linker_unload, link_elf_unload_file),
169 KOBJMETHOD(linker_load_file, link_elf_load_file),
170 KOBJMETHOD(linker_link_preload, link_elf_link_preload),
171 KOBJMETHOD(linker_link_preload_finish, link_elf_link_preload_finish),
172 KOBJMETHOD(linker_lookup_set, link_elf_lookup_set),
173 KOBJMETHOD(linker_each_function_name, link_elf_each_function_name),
174 KOBJMETHOD(linker_each_function_nameval, link_elf_each_function_nameval),
175 KOBJMETHOD(linker_ctf_get, link_elf_ctf_get),
176 KOBJMETHOD(linker_symtab_get, link_elf_symtab_get),
177 KOBJMETHOD(linker_strtab_get, link_elf_strtab_get),
181 static struct linker_class link_elf_class = {
182 #if ELF_TARG_CLASS == ELFCLASS32
187 link_elf_methods, sizeof(struct elf_file)
190 typedef int (*elf_reloc_fn)(linker_file_t lf, Elf_Addr relocbase,
191 const void *data, int type, elf_lookup_fn lookup);
193 static int parse_dynamic(elf_file_t);
194 static int relocate_file(elf_file_t);
195 static int relocate_file1(elf_file_t ef, elf_lookup_fn lookup,
196 elf_reloc_fn reloc, bool ifuncs);
197 static int link_elf_preload_parse_symbols(elf_file_t);
199 static struct elf_set_head set_pcpu_list;
201 static struct elf_set_head set_vnet_list;
205 elf_set_add(struct elf_set_head *list, Elf_Addr start, Elf_Addr stop, Elf_Addr base)
207 struct elf_set *set, *iter;
209 set = malloc(sizeof(*set), M_LINKER, M_WAITOK);
210 set->es_start = start;
214 TAILQ_FOREACH(iter, list, es_link) {
216 KASSERT((set->es_start < iter->es_start && set->es_stop < iter->es_stop) ||
217 (set->es_start > iter->es_start && set->es_stop > iter->es_stop),
218 ("linker sets intersection: to insert: 0x%jx-0x%jx; inserted: 0x%jx-0x%jx",
219 (uintmax_t)set->es_start, (uintmax_t)set->es_stop,
220 (uintmax_t)iter->es_start, (uintmax_t)iter->es_stop));
222 if (iter->es_start > set->es_start) {
223 TAILQ_INSERT_BEFORE(iter, set, es_link);
229 TAILQ_INSERT_TAIL(list, set, es_link);
233 elf_set_find(struct elf_set_head *list, Elf_Addr addr, Elf_Addr *start, Elf_Addr *base)
237 TAILQ_FOREACH(set, list, es_link) {
238 if (addr < set->es_start)
240 if (addr < set->es_stop) {
241 *start = set->es_start;
242 *base = set->es_base;
251 elf_set_delete(struct elf_set_head *list, Elf_Addr start)
255 TAILQ_FOREACH(set, list, es_link) {
256 if (start < set->es_start)
258 if (start == set->es_start) {
259 TAILQ_REMOVE(list, set, es_link);
264 KASSERT(0, ("deleting unknown linker set (start = 0x%jx)",
269 static void r_debug_state(struct r_debug *, struct link_map *);
272 * A list of loaded modules for GDB to use for loading symbols.
274 struct r_debug r_debug;
276 #define GDB_STATE(s) do { \
277 r_debug.r_state = s; r_debug_state(NULL, NULL); \
281 * Function for the debugger to set a breakpoint on to gain control.
284 r_debug_state(struct r_debug *dummy_one __unused,
285 struct link_map *dummy_two __unused)
290 link_elf_add_gdb(struct link_map *l)
292 struct link_map *prev;
296 if (r_debug.r_map == NULL) {
301 /* Append to list. */
302 for (prev = r_debug.r_map;
303 prev->l_next != NULL;
312 link_elf_delete_gdb(struct link_map *l)
314 if (l->l_prev == NULL) {
316 if ((r_debug.r_map = l->l_next) != NULL)
317 l->l_next->l_prev = NULL;
319 /* Remove any but first. */
320 if ((l->l_prev->l_next = l->l_next) != NULL)
321 l->l_next->l_prev = l->l_prev;
327 * The kernel symbol table starts here.
329 extern struct _dynamic _DYNAMIC;
332 link_elf_error(const char *filename, const char *s)
334 if (filename == NULL)
335 printf("kldload: %s\n", s);
337 printf("kldload: %s: %s\n", filename, s);
341 link_elf_invoke_ctors(caddr_t addr, size_t size)
346 if (addr == NULL || size == 0)
348 cnt = size / sizeof(*ctor);
350 for (i = 0; i < cnt; i++) {
357 * Actions performed after linking/loading both the preloaded kernel and any
358 * modules; whether preloaded or dynamicly loaded.
361 link_elf_link_common_finish(linker_file_t lf)
364 elf_file_t ef = (elf_file_t)lf;
369 /* Notify MD code that a module is being loaded. */
370 error = elf_cpu_load_file(lf);
376 ef->gdb.l_addr = lf->address;
377 newfilename = malloc(strlen(lf->filename) + 1, M_LINKER, M_WAITOK);
378 strcpy(newfilename, lf->filename);
379 ef->gdb.l_name = newfilename;
380 ef->gdb.l_ld = ef->dynamic;
381 link_elf_add_gdb(&ef->gdb);
382 GDB_STATE(RT_CONSISTENT);
386 link_elf_invoke_ctors(lf->ctors_addr, lf->ctors_size);
390 extern vm_offset_t __startkernel, __endkernel;
393 link_elf_init(void* arg)
396 Elf_Addr *ctors_addrp;
397 Elf_Size *ctors_sizep;
398 caddr_t modptr, baseptr, sizeptr;
402 linker_add_class(&link_elf_class);
404 dp = (Elf_Dyn *)&_DYNAMIC;
406 modptr = preload_search_by_type("elf" __XSTRING(__ELF_WORD_SIZE) " kernel");
408 modptr = preload_search_by_type("elf kernel");
409 modname = (char *)preload_search_info(modptr, MODINFO_NAME);
412 linker_kernel_file = linker_make_file(modname, &link_elf_class);
413 if (linker_kernel_file == NULL)
414 panic("%s: Can't create linker structures for kernel",
417 ef = (elf_file_t) linker_kernel_file;
420 ef->address = (caddr_t) (__startkernel - KERNBASE);
424 #ifdef SPARSE_MAPPING
432 linker_kernel_file->address = (caddr_t)__startkernel;
433 linker_kernel_file->size = (intptr_t)(__endkernel - __startkernel);
435 linker_kernel_file->address += KERNBASE;
436 linker_kernel_file->size = -(intptr_t)linker_kernel_file->address;
439 if (modptr != NULL) {
441 baseptr = preload_search_info(modptr, MODINFO_ADDR);
443 linker_kernel_file->address = *(caddr_t *)baseptr;
444 sizeptr = preload_search_info(modptr, MODINFO_SIZE);
446 linker_kernel_file->size = *(size_t *)sizeptr;
447 ctors_addrp = (Elf_Addr *)preload_search_info(modptr,
448 MODINFO_METADATA | MODINFOMD_CTORS_ADDR);
449 ctors_sizep = (Elf_Size *)preload_search_info(modptr,
450 MODINFO_METADATA | MODINFOMD_CTORS_SIZE);
451 if (ctors_addrp != NULL && ctors_sizep != NULL) {
452 linker_kernel_file->ctors_addr = ef->address +
454 linker_kernel_file->ctors_size = *ctors_sizep;
457 (void)link_elf_preload_parse_symbols(ef);
460 r_debug.r_map = NULL;
461 r_debug.r_brk = r_debug_state;
462 r_debug.r_state = RT_CONSISTENT;
465 (void)link_elf_link_common_finish(linker_kernel_file);
466 linker_kernel_file->flags |= LINKER_FILE_LINKED;
467 TAILQ_INIT(&set_pcpu_list);
469 TAILQ_INIT(&set_vnet_list);
473 SYSINIT(link_elf, SI_SUB_KLD, SI_ORDER_THIRD, link_elf_init, NULL);
476 link_elf_preload_parse_symbols(elf_file_t ef)
479 caddr_t ssym, esym, base;
485 if (ef->modptr == NULL)
487 pointer = preload_search_info(ef->modptr,
488 MODINFO_METADATA | MODINFOMD_SSYM);
491 ssym = *(caddr_t *)pointer;
492 pointer = preload_search_info(ef->modptr,
493 MODINFO_METADATA | MODINFOMD_ESYM);
496 esym = *(caddr_t *)pointer;
500 symcnt = *(long *)base;
501 base += sizeof(long);
502 symtab = (Elf_Sym *)base;
503 base += roundup(symcnt, sizeof(long));
505 if (base > esym || base < ssym) {
506 printf("Symbols are corrupt!\n");
510 strcnt = *(long *)base;
511 base += sizeof(long);
513 base += roundup(strcnt, sizeof(long));
515 if (base > esym || base < ssym) {
516 printf("Symbols are corrupt!\n");
520 ef->ddbsymtab = symtab;
521 ef->ddbsymcnt = symcnt / sizeof(Elf_Sym);
522 ef->ddbstrtab = strtab;
523 ef->ddbstrcnt = strcnt;
529 parse_dynamic(elf_file_t ef)
532 int plttype = DT_REL;
534 for (dp = ef->dynamic; dp->d_tag != DT_NULL; dp++) {
538 /* From src/libexec/rtld-elf/rtld.c */
539 const Elf_Hashelt *hashtab = (const Elf_Hashelt *)
540 (ef->address + dp->d_un.d_ptr);
541 ef->nbuckets = hashtab[0];
542 ef->nchains = hashtab[1];
543 ef->buckets = hashtab + 2;
544 ef->chains = ef->buckets + ef->nbuckets;
548 ef->strtab = (caddr_t) (ef->address + dp->d_un.d_ptr);
551 ef->strsz = dp->d_un.d_val;
554 ef->symtab = (Elf_Sym*) (ef->address + dp->d_un.d_ptr);
557 if (dp->d_un.d_val != sizeof(Elf_Sym))
561 ef->got = (Elf_Addr *) (ef->address + dp->d_un.d_ptr);
564 ef->rel = (const Elf_Rel *) (ef->address + dp->d_un.d_ptr);
567 ef->relsize = dp->d_un.d_val;
570 if (dp->d_un.d_val != sizeof(Elf_Rel))
574 ef->pltrel = (const Elf_Rel *) (ef->address + dp->d_un.d_ptr);
577 ef->pltrelsize = dp->d_un.d_val;
580 ef->rela = (const Elf_Rela *) (ef->address + dp->d_un.d_ptr);
583 ef->relasize = dp->d_un.d_val;
586 if (dp->d_un.d_val != sizeof(Elf_Rela))
590 plttype = dp->d_un.d_val;
591 if (plttype != DT_REL && plttype != DT_RELA)
596 dp->d_un.d_ptr = (Elf_Addr)&r_debug;
602 if (plttype == DT_RELA) {
603 ef->pltrela = (const Elf_Rela *)ef->pltrel;
605 ef->pltrelasize = ef->pltrelsize;
609 ef->ddbsymtab = ef->symtab;
610 ef->ddbsymcnt = ef->nchains;
611 ef->ddbstrtab = ef->strtab;
612 ef->ddbstrcnt = ef->strsz;
617 #define LS_PADDING 0x90909090
619 parse_dpcpu(elf_file_t ef)
622 #if defined(__i386__)
628 error = link_elf_lookup_set(&ef->lf, "pcpu", (void ***)&ef->pcpu_start,
629 (void ***)&ef->pcpu_stop, NULL);
630 /* Error just means there is no pcpu set to relocate. */
633 size = (uintptr_t)ef->pcpu_stop - (uintptr_t)ef->pcpu_start;
637 #if defined(__i386__)
638 /* In case we do find __start/stop_set_ symbols double-check. */
640 uprintf("Kernel module '%s' must be recompiled with "
641 "linker script\n", ef->lf.pathname);
645 /* Padding from linker-script correct? */
646 pad = *(uint32_t *)((uintptr_t)ef->pcpu_stop - sizeof(pad));
647 if (pad != LS_PADDING) {
648 uprintf("Kernel module '%s' must be recompiled with "
649 "linker script, invalid padding %#04x (%#04x)\n",
650 ef->lf.pathname, pad, LS_PADDING);
653 /* If we only have valid padding, nothing to do. */
658 * Allocate space in the primary pcpu area. Copy in our
659 * initialization from the data section and then initialize
660 * all per-cpu storage from that.
662 ef->pcpu_base = (Elf_Addr)(uintptr_t)dpcpu_alloc(size);
663 if (ef->pcpu_base == 0) {
664 printf("%s: pcpu module space is out of space; "
665 "cannot allocate %d for %s\n",
666 __func__, size, ef->lf.pathname);
669 memcpy((void *)ef->pcpu_base, (void *)ef->pcpu_start, size);
670 dpcpu_copy((void *)ef->pcpu_base, size);
671 elf_set_add(&set_pcpu_list, ef->pcpu_start, ef->pcpu_stop,
679 parse_vnet(elf_file_t ef)
682 #if defined(__i386__)
688 error = link_elf_lookup_set(&ef->lf, "vnet", (void ***)&ef->vnet_start,
689 (void ***)&ef->vnet_stop, NULL);
690 /* Error just means there is no vnet data set to relocate. */
693 size = (uintptr_t)ef->vnet_stop - (uintptr_t)ef->vnet_start;
697 #if defined(__i386__)
698 /* In case we do find __start/stop_set_ symbols double-check. */
700 uprintf("Kernel module '%s' must be recompiled with "
701 "linker script\n", ef->lf.pathname);
705 /* Padding from linker-script correct? */
706 pad = *(uint32_t *)((uintptr_t)ef->vnet_stop - sizeof(pad));
707 if (pad != LS_PADDING) {
708 uprintf("Kernel module '%s' must be recompiled with "
709 "linker script, invalid padding %#04x (%#04x)\n",
710 ef->lf.pathname, pad, LS_PADDING);
713 /* If we only have valid padding, nothing to do. */
718 * Allocate space in the primary vnet area. Copy in our
719 * initialization from the data section and then initialize
720 * all per-vnet storage from that.
722 ef->vnet_base = (Elf_Addr)(uintptr_t)vnet_data_alloc(size);
723 if (ef->vnet_base == 0) {
724 printf("%s: vnet module space is out of space; "
725 "cannot allocate %d for %s\n",
726 __func__, size, ef->lf.pathname);
729 memcpy((void *)ef->vnet_base, (void *)ef->vnet_start, size);
730 vnet_data_copy((void *)ef->vnet_base, size);
731 elf_set_add(&set_vnet_list, ef->vnet_start, ef->vnet_stop,
740 * Apply the specified protection to the loadable segments of a preloaded linker
744 preload_protect(elf_file_t ef, vm_prot_t prot)
748 Elf_Phdr *phdr, *phlimit;
753 hdr = (Elf_Ehdr *)ef->address;
754 phdr = (Elf_Phdr *)(ef->address + hdr->e_phoff);
755 phlimit = phdr + hdr->e_phnum;
756 for (; phdr < phlimit; phdr++) {
757 if (phdr->p_type != PT_LOAD)
760 nprot = prot | VM_PROT_READ;
761 if ((phdr->p_flags & PF_W) != 0)
762 nprot |= VM_PROT_WRITE;
763 if ((phdr->p_flags & PF_X) != 0)
764 nprot |= VM_PROT_EXECUTE;
765 error = pmap_change_prot((vm_offset_t)ef->address +
766 phdr->p_vaddr, round_page(phdr->p_memsz), nprot);
778 * Locate the ARM exception/unwind table info for DDB and stack(9) use by
779 * searching for the section header that describes it. There may be no unwind
780 * info, for example in a module containing only data.
783 link_elf_locate_exidx(linker_file_t lf, Elf_Shdr *shdr, int nhdr)
787 for (i = 0; i < nhdr; i++) {
788 if (shdr[i].sh_type == SHT_ARM_EXIDX) {
789 lf->exidx_addr = shdr[i].sh_addr + lf->address;
790 lf->exidx_size = shdr[i].sh_size;
797 * Locate the section headers metadata in a preloaded module, then use it to
798 * locate the exception/unwind table in the module. The size of the metadata
799 * block is stored in a uint32 word immediately before the data itself, and a
800 * comment in preload_search_info() says it is safe to rely on that.
803 link_elf_locate_exidx_preload(struct linker_file *lf, caddr_t modptr)
809 modinfo = (uint32_t *)preload_search_info(modptr,
810 MODINFO_METADATA | MODINFOMD_SHDR);
811 if (modinfo != NULL) {
812 shdr = (Elf_Shdr *)modinfo;
813 nhdr = modinfo[-1] / sizeof(Elf_Shdr);
814 link_elf_locate_exidx(lf, shdr, nhdr);
821 link_elf_link_preload(linker_class_t cls, const char *filename,
822 linker_file_t *result)
824 Elf_Addr *ctors_addrp;
825 Elf_Size *ctors_sizep;
826 caddr_t modptr, baseptr, sizeptr, dynptr;
833 /* Look to see if we have the file preloaded */
834 modptr = preload_search_by_name(filename);
838 type = (char *)preload_search_info(modptr, MODINFO_TYPE);
839 baseptr = preload_search_info(modptr, MODINFO_ADDR);
840 sizeptr = preload_search_info(modptr, MODINFO_SIZE);
841 dynptr = preload_search_info(modptr,
842 MODINFO_METADATA | MODINFOMD_DYNAMIC);
844 (strcmp(type, "elf" __XSTRING(__ELF_WORD_SIZE) " module") != 0 &&
845 strcmp(type, "elf module") != 0))
847 if (baseptr == NULL || sizeptr == NULL || dynptr == NULL)
850 lf = linker_make_file(filename, &link_elf_class);
854 ef = (elf_file_t) lf;
857 ef->address = *(caddr_t *)baseptr;
858 #ifdef SPARSE_MAPPING
861 dp = (vm_offset_t)ef->address + *(vm_offset_t *)dynptr;
862 ef->dynamic = (Elf_Dyn *)dp;
863 lf->address = ef->address;
864 lf->size = *(size_t *)sizeptr;
866 ctors_addrp = (Elf_Addr *)preload_search_info(modptr,
867 MODINFO_METADATA | MODINFOMD_CTORS_ADDR);
868 ctors_sizep = (Elf_Size *)preload_search_info(modptr,
869 MODINFO_METADATA | MODINFOMD_CTORS_SIZE);
870 if (ctors_addrp != NULL && ctors_sizep != NULL) {
871 lf->ctors_addr = ef->address + *ctors_addrp;
872 lf->ctors_size = *ctors_sizep;
876 link_elf_locate_exidx_preload(lf, modptr);
879 error = parse_dynamic(ef);
881 error = parse_dpcpu(ef);
884 error = parse_vnet(ef);
887 error = preload_protect(ef, VM_PROT_ALL);
889 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
892 link_elf_reloc_local(lf);
898 link_elf_link_preload_finish(linker_file_t lf)
903 ef = (elf_file_t) lf;
904 error = relocate_file(ef);
906 error = preload_protect(ef, VM_PROT_NONE);
909 (void)link_elf_preload_parse_symbols(ef);
911 return (link_elf_link_common_finish(lf));
915 link_elf_load_file(linker_class_t cls, const char* filename,
916 linker_file_t* result)
919 struct thread* td = curthread; /* XXX */
921 caddr_t firstpage, segbase;
925 Elf_Phdr *segs[MAXSEGS];
931 Elf_Addr base_vlimit;
949 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, filename, td);
951 error = vn_open(&nd, &flags, 0, NULL);
954 NDFREE(&nd, NDF_ONLY_PNBUF);
955 if (nd.ni_vp->v_type != VREG) {
961 error = mac_kld_check_load(curthread->td_ucred, nd.ni_vp);
969 * Read the elf header from the file.
971 firstpage = malloc(PAGE_SIZE, M_LINKER, M_WAITOK);
972 hdr = (Elf_Ehdr *)firstpage;
973 error = vn_rdwr(UIO_READ, nd.ni_vp, firstpage, PAGE_SIZE, 0,
974 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
976 nbytes = PAGE_SIZE - resid;
985 if (hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS ||
986 hdr->e_ident[EI_DATA] != ELF_TARG_DATA) {
987 link_elf_error(filename, "Unsupported file layout");
991 if (hdr->e_ident[EI_VERSION] != EV_CURRENT ||
992 hdr->e_version != EV_CURRENT) {
993 link_elf_error(filename, "Unsupported file version");
997 if (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN) {
1001 if (hdr->e_machine != ELF_TARG_MACH) {
1002 link_elf_error(filename, "Unsupported machine");
1008 * We rely on the program header being in the first page.
1009 * This is not strictly required by the ABI specification, but
1010 * it seems to always true in practice. And, it simplifies
1011 * things considerably.
1013 if (!((hdr->e_phentsize == sizeof(Elf_Phdr)) &&
1014 (hdr->e_phoff + hdr->e_phnum*sizeof(Elf_Phdr) <= PAGE_SIZE) &&
1015 (hdr->e_phoff + hdr->e_phnum*sizeof(Elf_Phdr) <= nbytes)))
1016 link_elf_error(filename, "Unreadable program headers");
1019 * Scan the program header entries, and save key information.
1021 * We rely on there being exactly two load segments, text and data,
1024 phdr = (Elf_Phdr *) (firstpage + hdr->e_phoff);
1025 phlimit = phdr + hdr->e_phnum;
1028 while (phdr < phlimit) {
1029 switch (phdr->p_type) {
1031 if (nsegs == MAXSEGS) {
1032 link_elf_error(filename, "Too many sections");
1037 * XXX: We just trust they come in right order ??
1054 if (phdyn == NULL) {
1055 link_elf_error(filename, "Object is not dynamically-linked");
1060 link_elf_error(filename, "No sections");
1066 * Allocate the entire address space of the object, to stake
1067 * out our contiguous region, and to establish the base
1068 * address for relocation.
1070 base_vaddr = trunc_page(segs[0]->p_vaddr);
1071 base_vlimit = round_page(segs[nsegs - 1]->p_vaddr +
1072 segs[nsegs - 1]->p_memsz);
1073 mapsize = base_vlimit - base_vaddr;
1075 lf = linker_make_file(filename, &link_elf_class);
1081 ef = (elf_file_t) lf;
1082 #ifdef SPARSE_MAPPING
1083 ef->object = vm_object_allocate(OBJT_PHYS, atop(mapsize));
1084 if (ef->object == NULL) {
1089 mapbase = (caddr_t)KERNBASE;
1091 mapbase = (caddr_t)vm_map_min(kernel_map);
1094 * Mapping protections are downgraded after relocation processing.
1096 error = vm_map_find(kernel_map, ef->object, 0,
1097 (vm_offset_t *)&mapbase, mapsize, 0, VMFS_OPTIMAL_SPACE,
1098 VM_PROT_ALL, VM_PROT_ALL, 0);
1100 vm_object_deallocate(ef->object);
1105 mapbase = malloc(mapsize, M_LINKER, M_EXEC | M_WAITOK);
1107 ef->address = mapbase;
1110 * Read the text and data sections and zero the bss.
1112 for (i = 0; i < nsegs; i++) {
1113 segbase = mapbase + segs[i]->p_vaddr - base_vaddr;
1115 #ifdef SPARSE_MAPPING
1117 * Consecutive segments may have different mapping permissions,
1118 * so be strict and verify that their mappings do not overlap.
1120 if (((vm_offset_t)segbase & PAGE_MASK) != 0) {
1125 error = vm_map_wire(kernel_map,
1126 (vm_offset_t)segbase,
1127 (vm_offset_t)segbase + round_page(segs[i]->p_memsz),
1128 VM_MAP_WIRE_SYSTEM | VM_MAP_WIRE_NOHOLES);
1129 if (error != KERN_SUCCESS) {
1135 error = vn_rdwr(UIO_READ, nd.ni_vp,
1136 segbase, segs[i]->p_filesz, segs[i]->p_offset,
1137 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
1141 bzero(segbase + segs[i]->p_filesz,
1142 segs[i]->p_memsz - segs[i]->p_filesz);
1146 /* Update profiling information with the new text segment. */
1148 kmupetext((uintfptr_t)(mapbase + segs[0]->p_vaddr - base_vaddr +
1153 ef->dynamic = (Elf_Dyn *) (mapbase + phdyn->p_vaddr - base_vaddr);
1155 lf->address = ef->address;
1158 error = parse_dynamic(ef);
1161 error = parse_dpcpu(ef);
1165 error = parse_vnet(ef);
1169 link_elf_reloc_local(lf);
1171 VOP_UNLOCK(nd.ni_vp, 0);
1172 error = linker_load_dependencies(lf);
1173 vn_lock(nd.ni_vp, LK_EXCLUSIVE | LK_RETRY);
1176 error = relocate_file(ef);
1180 #ifdef SPARSE_MAPPING
1182 * Downgrade permissions on text segment mappings now that relocation
1183 * processing is complete. Restrict permissions on read-only segments.
1185 for (i = 0; i < nsegs; i++) {
1188 if (segs[i]->p_type != PT_LOAD)
1191 prot = VM_PROT_READ;
1192 if ((segs[i]->p_flags & PF_W) != 0)
1193 prot |= VM_PROT_WRITE;
1194 if ((segs[i]->p_flags & PF_X) != 0)
1195 prot |= VM_PROT_EXECUTE;
1196 segbase = mapbase + segs[i]->p_vaddr - base_vaddr;
1197 error = vm_map_protect(kernel_map,
1198 (vm_offset_t)segbase,
1199 (vm_offset_t)segbase + round_page(segs[i]->p_memsz),
1201 if (error != KERN_SUCCESS) {
1209 * Try and load the symbol table if it's present. (you can
1212 nbytes = hdr->e_shnum * hdr->e_shentsize;
1213 if (nbytes == 0 || hdr->e_shoff == 0)
1215 shdr = malloc(nbytes, M_LINKER, M_WAITOK | M_ZERO);
1216 error = vn_rdwr(UIO_READ, nd.ni_vp,
1217 (caddr_t)shdr, nbytes, hdr->e_shoff,
1218 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
1223 /* Read section string table */
1224 shstrindex = hdr->e_shstrndx;
1225 if (shstrindex != 0 && shdr[shstrindex].sh_type == SHT_STRTAB &&
1226 shdr[shstrindex].sh_size != 0) {
1227 nbytes = shdr[shstrindex].sh_size;
1228 shstrs = malloc(nbytes, M_LINKER, M_WAITOK | M_ZERO);
1229 error = vn_rdwr(UIO_READ, nd.ni_vp, (caddr_t)shstrs, nbytes,
1230 shdr[shstrindex].sh_offset, UIO_SYSSPACE, IO_NODELOCKED,
1231 td->td_ucred, NOCRED, &resid, td);
1238 for (i = 0; i < hdr->e_shnum; i++) {
1239 if (shdr[i].sh_type == SHT_SYMTAB) {
1241 symstrindex = shdr[i].sh_link;
1242 } else if (shstrs != NULL && shdr[i].sh_name != 0 &&
1243 strcmp(shstrs + shdr[i].sh_name, ".ctors") == 0) {
1244 /* Record relocated address and size of .ctors. */
1245 lf->ctors_addr = mapbase + shdr[i].sh_addr - base_vaddr;
1246 lf->ctors_size = shdr[i].sh_size;
1249 if (symtabindex < 0 || symstrindex < 0)
1252 symcnt = shdr[symtabindex].sh_size;
1253 ef->symbase = malloc(symcnt, M_LINKER, M_WAITOK);
1254 strcnt = shdr[symstrindex].sh_size;
1255 ef->strbase = malloc(strcnt, M_LINKER, M_WAITOK);
1257 error = vn_rdwr(UIO_READ, nd.ni_vp,
1258 ef->symbase, symcnt, shdr[symtabindex].sh_offset,
1259 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
1263 error = vn_rdwr(UIO_READ, nd.ni_vp,
1264 ef->strbase, strcnt, shdr[symstrindex].sh_offset,
1265 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
1270 ef->ddbsymcnt = symcnt / sizeof(Elf_Sym);
1271 ef->ddbsymtab = (const Elf_Sym *)ef->symbase;
1272 ef->ddbstrcnt = strcnt;
1273 ef->ddbstrtab = ef->strbase;
1278 link_elf_locate_exidx(lf, shdr, hdr->e_shnum);
1281 error = link_elf_link_common_finish(lf);
1288 VOP_UNLOCK(nd.ni_vp, 0);
1289 vn_close(nd.ni_vp, FREAD, td->td_ucred, td);
1290 if (error != 0 && lf != NULL)
1291 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
1292 free(shdr, M_LINKER);
1293 free(firstpage, M_LINKER);
1294 free(shstrs, M_LINKER);
1300 elf_relocaddr(linker_file_t lf, Elf_Addr x)
1304 KASSERT(lf->ops->cls == (kobj_class_t)&link_elf_class,
1305 ("elf_relocaddr: unexpected linker file %p", lf));
1307 ef = (elf_file_t)lf;
1308 if (x >= ef->pcpu_start && x < ef->pcpu_stop)
1309 return ((x - ef->pcpu_start) + ef->pcpu_base);
1311 if (x >= ef->vnet_start && x < ef->vnet_stop)
1312 return ((x - ef->vnet_start) + ef->vnet_base);
1319 link_elf_unload_file(linker_file_t file)
1321 elf_file_t ef = (elf_file_t) file;
1323 if (ef->pcpu_base != 0) {
1324 dpcpu_free((void *)ef->pcpu_base,
1325 ef->pcpu_stop - ef->pcpu_start);
1326 elf_set_delete(&set_pcpu_list, ef->pcpu_start);
1329 if (ef->vnet_base != 0) {
1330 vnet_data_free((void *)ef->vnet_base,
1331 ef->vnet_stop - ef->vnet_start);
1332 elf_set_delete(&set_vnet_list, ef->vnet_start);
1336 if (ef->gdb.l_ld != NULL) {
1337 GDB_STATE(RT_DELETE);
1338 free((void *)(uintptr_t)ef->gdb.l_name, M_LINKER);
1339 link_elf_delete_gdb(&ef->gdb);
1340 GDB_STATE(RT_CONSISTENT);
1344 /* Notify MD code that a module is being unloaded. */
1345 elf_cpu_unload_file(file);
1347 if (ef->preloaded) {
1348 link_elf_unload_preload(file);
1352 #ifdef SPARSE_MAPPING
1353 if (ef->object != NULL) {
1354 vm_map_remove(kernel_map, (vm_offset_t) ef->address,
1355 (vm_offset_t) ef->address
1356 + (ef->object->size << PAGE_SHIFT));
1359 free(ef->address, M_LINKER);
1361 free(ef->symbase, M_LINKER);
1362 free(ef->strbase, M_LINKER);
1363 free(ef->ctftab, M_LINKER);
1364 free(ef->ctfoff, M_LINKER);
1365 free(ef->typoff, M_LINKER);
1369 link_elf_unload_preload(linker_file_t file)
1372 if (file->pathname != NULL)
1373 preload_delete_name(file->pathname);
1377 symbol_name(elf_file_t ef, Elf_Size r_info)
1381 if (ELF_R_SYM(r_info)) {
1382 ref = ef->symtab + ELF_R_SYM(r_info);
1383 return (ef->strtab + ref->st_name);
1389 symbol_type(elf_file_t ef, Elf_Size r_info)
1393 if (ELF_R_SYM(r_info)) {
1394 ref = ef->symtab + ELF_R_SYM(r_info);
1395 return (ELF_ST_TYPE(ref->st_info));
1397 return (STT_NOTYPE);
1401 relocate_file1(elf_file_t ef, elf_lookup_fn lookup, elf_reloc_fn reloc,
1405 const Elf_Rela *rela;
1406 const char *symname;
1408 #define APPLY_RELOCS(iter, tbl, tblsize, type) do { \
1409 for ((iter) = (tbl); (iter) != NULL && \
1410 (iter) < (tbl) + (tblsize) / sizeof(*(iter)); (iter)++) { \
1411 if ((symbol_type(ef, (iter)->r_info) == \
1413 elf_is_ifunc_reloc((iter)->r_info)) != ifuncs) \
1415 if (reloc(&ef->lf, (Elf_Addr)ef->address, \
1416 (iter), (type), lookup)) { \
1417 symname = symbol_name(ef, (iter)->r_info); \
1418 printf("link_elf: symbol %s undefined\n", \
1425 APPLY_RELOCS(rel, ef->rel, ef->relsize, ELF_RELOC_REL);
1426 APPLY_RELOCS(rela, ef->rela, ef->relasize, ELF_RELOC_RELA);
1427 APPLY_RELOCS(rel, ef->pltrel, ef->pltrelsize, ELF_RELOC_REL);
1428 APPLY_RELOCS(rela, ef->pltrela, ef->pltrelasize, ELF_RELOC_RELA);
1436 relocate_file(elf_file_t ef)
1440 error = relocate_file1(ef, elf_lookup, elf_reloc, false);
1442 error = relocate_file1(ef, elf_lookup, elf_reloc, true);
1447 * Hash function for symbol table lookup. Don't even think about changing
1448 * this. It is specified by the System V ABI.
1450 static unsigned long
1451 elf_hash(const char *name)
1453 const unsigned char *p = (const unsigned char *) name;
1454 unsigned long h = 0;
1457 while (*p != '\0') {
1458 h = (h << 4) + *p++;
1459 if ((g = h & 0xf0000000) != 0)
1467 link_elf_lookup_symbol(linker_file_t lf, const char *name, c_linker_sym_t *sym)
1469 elf_file_t ef = (elf_file_t) lf;
1470 unsigned long symnum;
1471 const Elf_Sym* symp;
1476 /* If we don't have a hash, bail. */
1477 if (ef->buckets == NULL || ef->nbuckets == 0) {
1478 printf("link_elf_lookup_symbol: missing symbol hash table\n");
1482 /* First, search hashed global symbols */
1483 hash = elf_hash(name);
1484 symnum = ef->buckets[hash % ef->nbuckets];
1486 while (symnum != STN_UNDEF) {
1487 if (symnum >= ef->nchains) {
1488 printf("%s: corrupt symbol table\n", __func__);
1492 symp = ef->symtab + symnum;
1493 if (symp->st_name == 0) {
1494 printf("%s: corrupt symbol table\n", __func__);
1498 strp = ef->strtab + symp->st_name;
1500 if (strcmp(name, strp) == 0) {
1501 if (symp->st_shndx != SHN_UNDEF ||
1502 (symp->st_value != 0 &&
1503 (ELF_ST_TYPE(symp->st_info) == STT_FUNC ||
1504 ELF_ST_TYPE(symp->st_info) == STT_GNU_IFUNC))) {
1505 *sym = (c_linker_sym_t) symp;
1511 symnum = ef->chains[symnum];
1514 /* If we have not found it, look at the full table (if loaded) */
1515 if (ef->symtab == ef->ddbsymtab)
1518 /* Exhaustive search */
1519 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) {
1520 strp = ef->ddbstrtab + symp->st_name;
1521 if (strcmp(name, strp) == 0) {
1522 if (symp->st_shndx != SHN_UNDEF ||
1523 (symp->st_value != 0 &&
1524 (ELF_ST_TYPE(symp->st_info) == STT_FUNC ||
1525 ELF_ST_TYPE(symp->st_info) == STT_GNU_IFUNC))) {
1526 *sym = (c_linker_sym_t) symp;
1537 link_elf_symbol_values(linker_file_t lf, c_linker_sym_t sym,
1538 linker_symval_t *symval)
1544 ef = (elf_file_t)lf;
1545 es = (const Elf_Sym *)sym;
1546 if (es >= ef->symtab && es < (ef->symtab + ef->nchains)) {
1547 symval->name = ef->strtab + es->st_name;
1548 val = (caddr_t)ef->address + es->st_value;
1549 if (ELF_ST_TYPE(es->st_info) == STT_GNU_IFUNC)
1550 val = ((caddr_t (*)(void))val)();
1551 symval->value = val;
1552 symval->size = es->st_size;
1555 if (ef->symtab == ef->ddbsymtab)
1557 if (es >= ef->ddbsymtab && es < (ef->ddbsymtab + ef->ddbsymcnt)) {
1558 symval->name = ef->ddbstrtab + es->st_name;
1559 val = (caddr_t)ef->address + es->st_value;
1560 if (ELF_ST_TYPE(es->st_info) == STT_GNU_IFUNC)
1561 val = ((caddr_t (*)(void))val)();
1562 symval->value = val;
1563 symval->size = es->st_size;
1570 link_elf_search_symbol(linker_file_t lf, caddr_t value,
1571 c_linker_sym_t *sym, long *diffp)
1573 elf_file_t ef = (elf_file_t) lf;
1574 u_long off = (uintptr_t) (void *) value;
1578 const Elf_Sym* best = NULL;
1581 for (i = 0, es = ef->ddbsymtab; i < ef->ddbsymcnt; i++, es++) {
1582 if (es->st_name == 0)
1584 st_value = es->st_value + (uintptr_t) (void *) ef->address;
1585 if (off >= st_value) {
1586 if (off - st_value < diff) {
1587 diff = off - st_value;
1591 } else if (off - st_value == diff) {
1600 *sym = (c_linker_sym_t) best;
1606 * Look up a linker set on an ELF system.
1609 link_elf_lookup_set(linker_file_t lf, const char *name,
1610 void ***startp, void ***stopp, int *countp)
1613 linker_symval_t symval;
1615 void **start, **stop;
1616 int len, error = 0, count;
1618 len = strlen(name) + sizeof("__start_set_"); /* sizeof includes \0 */
1619 setsym = malloc(len, M_LINKER, M_WAITOK);
1621 /* get address of first entry */
1622 snprintf(setsym, len, "%s%s", "__start_set_", name);
1623 error = link_elf_lookup_symbol(lf, setsym, &sym);
1626 link_elf_symbol_values(lf, sym, &symval);
1627 if (symval.value == 0) {
1631 start = (void **)symval.value;
1633 /* get address of last entry */
1634 snprintf(setsym, len, "%s%s", "__stop_set_", name);
1635 error = link_elf_lookup_symbol(lf, setsym, &sym);
1638 link_elf_symbol_values(lf, sym, &symval);
1639 if (symval.value == 0) {
1643 stop = (void **)symval.value;
1645 /* and the number of entries */
1646 count = stop - start;
1657 free(setsym, M_LINKER);
1662 link_elf_each_function_name(linker_file_t file,
1663 int (*callback)(const char *, void *), void *opaque)
1665 elf_file_t ef = (elf_file_t)file;
1666 const Elf_Sym *symp;
1669 /* Exhaustive search */
1670 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) {
1671 if (symp->st_value != 0 &&
1672 (ELF_ST_TYPE(symp->st_info) == STT_FUNC ||
1673 ELF_ST_TYPE(symp->st_info) == STT_GNU_IFUNC)) {
1674 error = callback(ef->ddbstrtab + symp->st_name, opaque);
1683 link_elf_each_function_nameval(linker_file_t file,
1684 linker_function_nameval_callback_t callback, void *opaque)
1686 linker_symval_t symval;
1687 elf_file_t ef = (elf_file_t)file;
1688 const Elf_Sym* symp;
1691 /* Exhaustive search */
1692 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) {
1693 if (symp->st_value != 0 &&
1694 (ELF_ST_TYPE(symp->st_info) == STT_FUNC ||
1695 ELF_ST_TYPE(symp->st_info) == STT_GNU_IFUNC)) {
1696 error = link_elf_symbol_values(file,
1697 (c_linker_sym_t) symp, &symval);
1700 error = callback(file, i, &symval, opaque);
1709 elf_get_sym(linker_file_t lf, Elf_Size symidx)
1711 elf_file_t ef = (elf_file_t)lf;
1713 if (symidx >= ef->nchains)
1715 return (ef->symtab + symidx);
1719 elf_get_symname(linker_file_t lf, Elf_Size symidx)
1721 elf_file_t ef = (elf_file_t)lf;
1724 if (symidx >= ef->nchains)
1726 sym = ef->symtab + symidx;
1727 return (ef->strtab + sym->st_name);
1731 * Symbol lookup function that can be used when the symbol index is known (ie
1732 * in relocations). It uses the symbol index instead of doing a fully fledged
1733 * hash table based lookup when such is valid. For example for local symbols.
1734 * This is not only more efficient, it's also more correct. It's not always
1735 * the case that the symbol can be found through the hash table.
1738 elf_lookup(linker_file_t lf, Elf_Size symidx, int deps, Elf_Addr *res)
1740 elf_file_t ef = (elf_file_t)lf;
1743 Elf_Addr addr, start, base;
1745 /* Don't even try to lookup the symbol if the index is bogus. */
1746 if (symidx >= ef->nchains) {
1751 sym = ef->symtab + symidx;
1754 * Don't do a full lookup when the symbol is local. It may even
1755 * fail because it may not be found through the hash table.
1757 if (ELF_ST_BIND(sym->st_info) == STB_LOCAL) {
1758 /* Force lookup failure when we have an insanity. */
1759 if (sym->st_shndx == SHN_UNDEF || sym->st_value == 0) {
1763 *res = ((Elf_Addr)ef->address + sym->st_value);
1768 * XXX we can avoid doing a hash table based lookup for global
1769 * symbols as well. This however is not always valid, so we'll
1770 * just do it the hard way for now. Performance tweaks can
1774 symbol = ef->strtab + sym->st_name;
1776 /* Force a lookup failure if the symbol name is bogus. */
1782 addr = ((Elf_Addr)linker_file_lookup_symbol(lf, symbol, deps));
1783 if (addr == 0 && ELF_ST_BIND(sym->st_info) != STB_WEAK) {
1788 if (elf_set_find(&set_pcpu_list, addr, &start, &base))
1789 addr = addr - start + base;
1791 else if (elf_set_find(&set_vnet_list, addr, &start, &base))
1792 addr = addr - start + base;
1799 link_elf_reloc_local(linker_file_t lf)
1801 const Elf_Rel *rellim;
1803 const Elf_Rela *relalim;
1804 const Elf_Rela *rela;
1805 elf_file_t ef = (elf_file_t)lf;
1807 /* Perform relocations without addend if there are any: */
1808 if ((rel = ef->rel) != NULL) {
1809 rellim = (const Elf_Rel *)((const char *)ef->rel + ef->relsize);
1810 while (rel < rellim) {
1811 elf_reloc_local(lf, (Elf_Addr)ef->address, rel,
1812 ELF_RELOC_REL, elf_lookup);
1817 /* Perform relocations with addend if there are any: */
1818 if ((rela = ef->rela) != NULL) {
1819 relalim = (const Elf_Rela *)
1820 ((const char *)ef->rela + ef->relasize);
1821 while (rela < relalim) {
1822 elf_reloc_local(lf, (Elf_Addr)ef->address, rela,
1823 ELF_RELOC_RELA, elf_lookup);
1830 link_elf_symtab_get(linker_file_t lf, const Elf_Sym **symtab)
1832 elf_file_t ef = (elf_file_t)lf;
1834 *symtab = ef->ddbsymtab;
1836 if (*symtab == NULL)
1839 return (ef->ddbsymcnt);
1843 link_elf_strtab_get(linker_file_t lf, caddr_t *strtab)
1845 elf_file_t ef = (elf_file_t)lf;
1847 *strtab = ef->ddbstrtab;
1849 if (*strtab == NULL)
1852 return (ef->ddbstrcnt);
1855 #if defined(__i386__) || defined(__amd64__) || defined(__aarch64__)
1857 * Use this lookup routine when performing relocations early during boot.
1858 * The generic lookup routine depends on kobj, which is not initialized
1862 elf_lookup_ifunc(linker_file_t lf, Elf_Size symidx, int deps __unused,
1866 const Elf_Sym *symp;
1869 ef = (elf_file_t)lf;
1870 symp = ef->symtab + symidx;
1871 if (ELF_ST_TYPE(symp->st_info) == STT_GNU_IFUNC) {
1872 val = (caddr_t)ef->address + symp->st_value;
1873 *res = ((Elf_Addr (*)(void))val)();
1880 link_elf_ireloc(caddr_t kmdp)
1882 struct elf_file eff;
1887 bzero_early(ef, sizeof(*ef));
1890 ef->dynamic = (Elf_Dyn *)&_DYNAMIC;
1893 link_elf_preload_parse_symbols(ef);
1894 relocate_file1(ef, elf_lookup_ifunc, elf_reloc, true);