2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
3 * Copyright (c) 1998 Peter Wemm <peter@freebsd.org>
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
31 #include <sys/param.h>
33 #include <sys/linker.h>
34 #include <sys/module.h>
35 #include <sys/stdint.h>
37 #include <machine/elf.h>
42 #include "bootstrap.h"
44 #define COPYOUT(s,d,l) archsw.arch_copyout((vm_offset_t)(s), d, l)
46 #if defined(__i386__) && __ELF_WORD_SIZE == 64
49 #define ELF_TARG_CLASS ELFCLASS64
50 #define ELF_TARG_MACH EM_X86_64
53 typedef struct elf_file {
75 static int __elfN(loadimage)(struct preloaded_file *mp, elf_file_t ef, u_int64_t loadaddr);
76 static int __elfN(lookup_symbol)(struct preloaded_file *mp, elf_file_t ef, const char* name, Elf_Sym* sym);
77 static int __elfN(reloc_ptr)(struct preloaded_file *mp, elf_file_t ef,
78 Elf_Addr p, void *val, size_t len);
79 static int __elfN(parse_modmetadata)(struct preloaded_file *mp, elf_file_t ef,
80 Elf_Addr p_start, Elf_Addr p_end);
81 static symaddr_fn __elfN(symaddr);
82 static char *fake_modname(const char *name);
84 const char *__elfN(kerneltype) = "elf kernel";
85 const char *__elfN(moduletype) = "elf module";
87 u_int64_t __elfN(relocation_offset) = 0;
90 __elfN(load_elf_header)(char *filename, elf_file_t ef)
97 * Open the image, read and validate the ELF header
99 if (filename == NULL) /* can't handle nameless */
101 if ((ef->fd = open(filename, O_RDONLY)) == -1)
103 ef->firstpage = malloc(PAGE_SIZE);
104 if (ef->firstpage == NULL) {
108 bytes_read = read(ef->fd, ef->firstpage, PAGE_SIZE);
109 ef->firstlen = (size_t)bytes_read;
110 if (bytes_read < 0 || ef->firstlen <= sizeof(Elf_Ehdr)) {
111 err = EFTYPE; /* could be EIO, but may be small file */
114 ehdr = ef->ehdr = (Elf_Ehdr *)ef->firstpage;
117 if (!IS_ELF(*ehdr)) {
121 if (ehdr->e_ident[EI_CLASS] != ELF_TARG_CLASS || /* Layout ? */
122 ehdr->e_ident[EI_DATA] != ELF_TARG_DATA ||
123 ehdr->e_ident[EI_VERSION] != EV_CURRENT || /* Version ? */
124 ehdr->e_version != EV_CURRENT ||
125 ehdr->e_machine != ELF_TARG_MACH) { /* Machine ? */
133 if (ef->firstpage != NULL) {
135 ef->firstpage = NULL;
145 * Attempt to load the file (file) as an ELF module. It will be stored at
146 * (dest), and a pointer to a module structure describing the loaded object
147 * will be saved in (result).
150 __elfN(loadfile)(char *filename, u_int64_t dest, struct preloaded_file **result)
152 return (__elfN(loadfile_raw)(filename, dest, result, 0));
156 __elfN(loadfile_raw)(char *filename, u_int64_t dest,
157 struct preloaded_file **result, int multiboot)
159 struct preloaded_file *fp, *kfp;
165 bzero(&ef, sizeof(struct elf_file));
168 err = __elfN(load_elf_header)(filename, &ef);
175 * Check to see what sort of module we are.
177 kfp = file_findfile(NULL, __elfN(kerneltype));
178 if (ehdr->e_type == ET_DYN) {
179 /* Looks like a kld module */
180 if (multiboot != 0) {
181 printf("elf" __XSTRING(__ELF_WORD_SIZE) "_loadfile: can't load module as multiboot\n");
186 printf("elf" __XSTRING(__ELF_WORD_SIZE) "_loadfile: can't load module before kernel\n");
190 if (strcmp(__elfN(kerneltype), kfp->f_type)) {
191 printf("elf" __XSTRING(__ELF_WORD_SIZE) "_loadfile: can't load module with kernel type '%s'\n", kfp->f_type);
195 /* Looks OK, got ahead */
198 } else if (ehdr->e_type == ET_EXEC) {
199 /* Looks like a kernel */
201 printf("elf" __XSTRING(__ELF_WORD_SIZE) "_loadfile: kernel already loaded\n");
206 * Calculate destination address based on kernel entrypoint
208 dest = (ehdr->e_entry & ~PAGE_MASK);
210 printf("elf" __XSTRING(__ELF_WORD_SIZE) "_loadfile: not a kernel (maybe static binary?)\n");
221 if (archsw.arch_loadaddr != NULL)
222 dest = archsw.arch_loadaddr(LOAD_ELF, ehdr, dest);
224 dest = roundup(dest, PAGE_SIZE);
227 * Ok, we think we should handle this.
231 printf("elf" __XSTRING(__ELF_WORD_SIZE) "_loadfile: cannot allocate module info\n");
235 if (ef.kernel == 1 && multiboot == 0)
236 setenv("kernelname", filename, 1);
237 fp->f_name = strdup(filename);
239 fp->f_type = strdup(ef.kernel ?
240 __elfN(kerneltype) : __elfN(moduletype));
242 fp->f_type = strdup("elf multiboot kernel");
246 printf("%s entry at 0x%jx\n", filename, (uintmax_t)ehdr->e_entry);
248 printf("%s ", filename);
251 fp->f_size = __elfN(loadimage)(fp, &ef, dest);
252 if (fp->f_size == 0 || fp->f_addr == 0)
255 /* save exec header as metadata */
256 file_addmetadata(fp, MODINFOMD_ELFHDR, sizeof(*ehdr), ehdr);
258 /* Load OK, return module pointer */
259 *result = (struct preloaded_file *)fp;
276 * With the file (fd) open on the image, and (ehdr) containing
277 * the Elf header, load the image at (off)
280 __elfN(loadimage)(struct preloaded_file *fp, elf_file_t ef, u_int64_t off)
285 Elf_Phdr *phdr, *php;
289 vm_offset_t firstaddr;
290 vm_offset_t lastaddr;
303 Elf_Addr p_start, p_end;
308 firstaddr = lastaddr = 0;
311 #if defined(__i386__) || defined(__amd64__)
312 #if __ELF_WORD_SIZE == 64
313 off = - (off & 0xffffffffff000000ull);/* x86_64 relocates after locore */
315 off = - (off & 0xff000000u); /* i386 relocates after locore */
317 #elif defined(__powerpc__)
319 * On the purely virtual memory machines like e500, the kernel is
320 * linked against its final VA range, which is most often not
321 * available at the loader stage, but only after kernel initializes
322 * and completes its VM settings. In such cases we cannot use p_vaddr
323 * field directly to load ELF segments, but put them at some
324 * 'load-time' locations.
326 if (off & 0xf0000000u) {
327 off = -(off & 0xf0000000u);
329 * XXX the physical load address should not be hardcoded. Note
330 * that the Book-E kernel assumes that it's loaded at a 16MB
331 * boundary for now...
334 ehdr->e_entry += off;
336 printf("Converted entry 0x%08x\n", ehdr->e_entry);
340 #elif defined(__arm__)
342 * The elf headers in some kernels specify virtual addresses in all
343 * header fields. More recently, the e_entry and p_paddr fields are the
344 * proper physical addresses. Even when the p_paddr fields are correct,
345 * the MI code below uses the p_vaddr fields with an offset added for
346 * loading (doing so is arguably wrong). To make loading work, we need
347 * an offset that represents the difference between physical and virtual
348 * addressing. ARM kernels are always linked at 0xCnnnnnnn. Depending
349 * on the headers, the offset value passed in may be physical or virtual
350 * (because it typically comes from e_entry), but we always replace
351 * whatever is passed in with the va<->pa offset. On the other hand, we
352 * always remove the high-order part of the entry address whether it's
353 * physical or virtual, because it will be adjusted later for the actual
354 * physical entry point based on where the image gets loaded.
357 ehdr->e_entry &= ~0xf0000000;
359 printf("ehdr->e_entry 0x%08x, va<->pa off %llx\n", ehdr->e_entry, off);
362 off = 0; /* other archs use direct mapped kernels */
364 __elfN(relocation_offset) = off;
368 if ((ehdr->e_phoff + ehdr->e_phnum * sizeof(*phdr)) > ef->firstlen) {
369 printf("elf" __XSTRING(__ELF_WORD_SIZE) "_loadimage: program header not within first page\n");
372 phdr = (Elf_Phdr *)(ef->firstpage + ehdr->e_phoff);
374 for (i = 0; i < ehdr->e_phnum; i++) {
375 /* We want to load PT_LOAD segments only.. */
376 if (phdr[i].p_type != PT_LOAD)
380 printf("Segment: 0x%lx@0x%lx -> 0x%lx-0x%lx",
381 (long)phdr[i].p_filesz, (long)phdr[i].p_offset,
382 (long)(phdr[i].p_vaddr + off),
383 (long)(phdr[i].p_vaddr + off + phdr[i].p_memsz - 1));
385 if ((phdr[i].p_flags & PF_W) == 0) {
386 printf("text=0x%lx ", (long)phdr[i].p_filesz);
388 printf("data=0x%lx", (long)phdr[i].p_filesz);
389 if (phdr[i].p_filesz < phdr[i].p_memsz)
390 printf("+0x%lx", (long)(phdr[i].p_memsz -phdr[i].p_filesz));
395 if (ef->firstlen > phdr[i].p_offset) {
396 fpcopy = ef->firstlen - phdr[i].p_offset;
397 archsw.arch_copyin(ef->firstpage + phdr[i].p_offset,
398 phdr[i].p_vaddr + off, fpcopy);
400 if (phdr[i].p_filesz > fpcopy) {
401 if (kern_pread(ef->fd, phdr[i].p_vaddr + off + fpcopy,
402 phdr[i].p_filesz - fpcopy, phdr[i].p_offset + fpcopy) != 0) {
403 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
404 "_loadimage: read failed\n");
408 /* clear space from oversized segments; eg: bss */
409 if (phdr[i].p_filesz < phdr[i].p_memsz) {
411 printf(" (bss: 0x%lx-0x%lx)",
412 (long)(phdr[i].p_vaddr + off + phdr[i].p_filesz),
413 (long)(phdr[i].p_vaddr + off + phdr[i].p_memsz - 1));
416 kern_bzero(phdr[i].p_vaddr + off + phdr[i].p_filesz,
417 phdr[i].p_memsz - phdr[i].p_filesz);
423 if (archsw.arch_loadseg != NULL)
424 archsw.arch_loadseg(ehdr, phdr + i, off);
426 if (firstaddr == 0 || firstaddr > (phdr[i].p_vaddr + off))
427 firstaddr = phdr[i].p_vaddr + off;
428 if (lastaddr == 0 || lastaddr < (phdr[i].p_vaddr + off + phdr[i].p_memsz))
429 lastaddr = phdr[i].p_vaddr + off + phdr[i].p_memsz;
431 lastaddr = roundup(lastaddr, sizeof(long));
434 * Get the section headers. We need this for finding the .ctors
435 * section as well as for loading any symbols. Both may be hard
436 * to do if reading from a .gz file as it involves seeking. I
437 * think the rule is going to have to be that you must strip a
438 * file to remove symbols before gzipping it.
440 chunk = ehdr->e_shnum * ehdr->e_shentsize;
441 if (chunk == 0 || ehdr->e_shoff == 0)
443 shdr = alloc_pread(ef->fd, ehdr->e_shoff, chunk);
445 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
446 "_loadimage: failed to read section headers");
449 file_addmetadata(fp, MODINFOMD_SHDR, chunk, shdr);
452 * Read the section string table and look for the .ctors section.
453 * We need to tell the kernel where it is so that it can call the
456 chunk = shdr[ehdr->e_shstrndx].sh_size;
458 shstr = alloc_pread(ef->fd, shdr[ehdr->e_shstrndx].sh_offset, chunk);
460 for (i = 0; i < ehdr->e_shnum; i++) {
461 if (strcmp(shstr + shdr[i].sh_name, ".ctors") != 0)
463 ctors = shdr[i].sh_addr;
464 file_addmetadata(fp, MODINFOMD_CTORS_ADDR, sizeof(ctors),
466 size = shdr[i].sh_size;
467 file_addmetadata(fp, MODINFOMD_CTORS_SIZE, sizeof(size),
476 * Now load any symbols.
480 for (i = 0; i < ehdr->e_shnum; i++) {
481 if (shdr[i].sh_type != SHT_SYMTAB)
483 for (j = 0; j < ehdr->e_phnum; j++) {
484 if (phdr[j].p_type != PT_LOAD)
486 if (shdr[i].sh_offset >= phdr[j].p_offset &&
487 (shdr[i].sh_offset + shdr[i].sh_size <=
488 phdr[j].p_offset + phdr[j].p_filesz)) {
489 shdr[i].sh_offset = 0;
494 if (shdr[i].sh_offset == 0 || shdr[i].sh_size == 0)
495 continue; /* alread loaded in a PT_LOAD above */
496 /* Save it for loading below */
498 symstrindex = shdr[i].sh_link;
500 if (symtabindex < 0 || symstrindex < 0)
503 /* Ok, committed to a load. */
508 for (i = symtabindex; i >= 0; i = symstrindex) {
512 switch(shdr[i].sh_type) {
513 case SHT_SYMTAB: /* Symbol table */
516 case SHT_STRTAB: /* String table */
525 size = shdr[i].sh_size;
526 archsw.arch_copyin(&size, lastaddr, sizeof(size));
527 lastaddr += sizeof(size);
530 printf("\n%s: 0x%jx@0x%jx -> 0x%jx-0x%jx", secname,
531 (uintmax_t)shdr[i].sh_size, (uintmax_t)shdr[i].sh_offset,
532 (uintmax_t)lastaddr, (uintmax_t)(lastaddr + shdr[i].sh_size));
534 if (i == symstrindex)
536 printf("0x%lx+0x%lx", (long)sizeof(size), (long)size);
539 if (lseek(ef->fd, (off_t)shdr[i].sh_offset, SEEK_SET) == -1) {
540 printf("\nelf" __XSTRING(__ELF_WORD_SIZE) "_loadimage: could not seek for symbols - skipped!");
545 result = archsw.arch_readin(ef->fd, lastaddr, shdr[i].sh_size);
546 if (result < 0 || (size_t)result != shdr[i].sh_size) {
547 printf("\nelf" __XSTRING(__ELF_WORD_SIZE) "_loadimage: could not read symbols - skipped! (%ju != %ju)", (uintmax_t)result,
548 (uintmax_t)shdr[i].sh_size);
553 /* Reset offsets relative to ssym */
554 lastaddr += shdr[i].sh_size;
555 lastaddr = roundup(lastaddr, sizeof(size));
556 if (i == symtabindex)
558 else if (i == symstrindex)
566 file_addmetadata(fp, MODINFOMD_SSYM, sizeof(ssym), &ssym);
567 file_addmetadata(fp, MODINFOMD_ESYM, sizeof(esym), &esym);
572 ret = lastaddr - firstaddr;
573 fp->f_addr = firstaddr;
576 for (i = 0; i < ehdr->e_phnum; i++) {
577 if (phdr[i].p_type == PT_DYNAMIC) {
580 file_addmetadata(fp, MODINFOMD_DYNAMIC, sizeof(adp), &adp);
585 if (php == NULL) /* this is bad, we cannot get to symbols or _DYNAMIC */
588 ndp = php->p_filesz / sizeof(Elf_Dyn);
591 dp = malloc(php->p_filesz);
594 archsw.arch_copyout(php->p_vaddr + off, dp, php->p_filesz);
597 for (i = 0; i < ndp; i++) {
598 if (dp[i].d_tag == 0)
600 switch (dp[i].d_tag) {
602 ef->hashtab = (Elf_Hashelt*)(uintptr_t)(dp[i].d_un.d_ptr + off);
605 ef->strtab = (char *)(uintptr_t)(dp[i].d_un.d_ptr + off);
608 ef->strsz = dp[i].d_un.d_val;
611 ef->symtab = (Elf_Sym*)(uintptr_t)(dp[i].d_un.d_ptr + off);
614 ef->rel = (Elf_Rel *)(uintptr_t)(dp[i].d_un.d_ptr + off);
617 ef->relsz = dp[i].d_un.d_val;
620 ef->rela = (Elf_Rela *)(uintptr_t)(dp[i].d_un.d_ptr + off);
623 ef->relasz = dp[i].d_un.d_val;
629 if (ef->hashtab == NULL || ef->symtab == NULL ||
630 ef->strtab == NULL || ef->strsz == 0)
632 COPYOUT(ef->hashtab, &ef->nbuckets, sizeof(ef->nbuckets));
633 COPYOUT(ef->hashtab + 1, &ef->nchains, sizeof(ef->nchains));
634 ef->buckets = ef->hashtab + 2;
635 ef->chains = ef->buckets + ef->nbuckets;
637 if (__elfN(lookup_symbol)(fp, ef, "__start_set_modmetadata_set", &sym) != 0)
639 p_start = sym.st_value + ef->off;
640 if (__elfN(lookup_symbol)(fp, ef, "__stop_set_modmetadata_set", &sym) != 0)
642 p_end = sym.st_value + ef->off;
644 if (__elfN(parse_modmetadata)(fp, ef, p_start, p_end) == 0)
647 if (ef->kernel) /* kernel must not depend on anything */
658 static char invalid_name[] = "bad";
661 fake_modname(const char *name)
667 sp = strrchr(name, '/');
672 ep = strrchr(name, '.');
676 ep = invalid_name + sizeof(invalid_name) - 1;
679 ep = name + strlen(name);
681 fp = malloc(len + 1);
689 #if (defined(__i386__) || defined(__powerpc__)) && __ELF_WORD_SIZE == 64
690 struct mod_metadata64 {
691 int md_version; /* structure version MDTV_* */
692 int md_type; /* type of entry MDT_* */
693 u_int64_t md_data; /* specific data */
694 u_int64_t md_cval; /* common string label */
697 #if defined(__amd64__) && __ELF_WORD_SIZE == 32
698 struct mod_metadata32 {
699 int md_version; /* structure version MDTV_* */
700 int md_type; /* type of entry MDT_* */
701 u_int32_t md_data; /* specific data */
702 u_int32_t md_cval; /* common string label */
707 __elfN(load_modmetadata)(struct preloaded_file *fp, u_int64_t dest)
711 Elf_Shdr *sh_meta, *shdr = NULL;
712 Elf_Shdr *sh_data[2];
713 char *shstrtab = NULL;
715 Elf_Addr p_start, p_end;
717 bzero(&ef, sizeof(struct elf_file));
720 err = __elfN(load_elf_header)(fp->f_name, &ef);
724 if (ef.ehdr->e_type == ET_EXEC) {
726 } else if (ef.ehdr->e_type != ET_DYN) {
731 size = ef.ehdr->e_shnum * ef.ehdr->e_shentsize;
732 shdr = alloc_pread(ef.fd, ef.ehdr->e_shoff, size);
739 shstrtab = alloc_pread(ef.fd, shdr[ef.ehdr->e_shstrndx].sh_offset,
740 shdr[ef.ehdr->e_shstrndx].sh_size);
741 if (shstrtab == NULL) {
742 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
743 "load_modmetadata: unable to load shstrtab\n");
748 /* Find set_modmetadata_set and data sections. */
749 sh_data[0] = sh_data[1] = sh_meta = NULL;
750 for (i = 0, j = 0; i < ef.ehdr->e_shnum; i++) {
751 if (strcmp(&shstrtab[shdr[i].sh_name],
752 "set_modmetadata_set") == 0) {
755 if ((strcmp(&shstrtab[shdr[i].sh_name], ".data") == 0) ||
756 (strcmp(&shstrtab[shdr[i].sh_name], ".rodata") == 0)) {
757 sh_data[j++] = &shdr[i];
760 if (sh_meta == NULL || sh_data[0] == NULL || sh_data[1] == NULL) {
761 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
762 "load_modmetadata: unable to find set_modmetadata_set or data sections\n");
767 /* Load set_modmetadata_set into memory */
768 err = kern_pread(ef.fd, dest, sh_meta->sh_size, sh_meta->sh_offset);
770 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
771 "load_modmetadata: unable to load set_modmetadata_set: %d\n", err);
775 p_end = dest + sh_meta->sh_size;
776 dest += sh_meta->sh_size;
778 /* Load data sections into memory. */
779 err = kern_pread(ef.fd, dest, sh_data[0]->sh_size,
780 sh_data[0]->sh_offset);
782 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
783 "load_modmetadata: unable to load data: %d\n", err);
788 * We have to increment the dest, so that the offset is the same into
789 * both the .rodata and .data sections.
791 ef.off = -(sh_data[0]->sh_addr - dest);
792 dest += (sh_data[1]->sh_addr - sh_data[0]->sh_addr);
794 err = kern_pread(ef.fd, dest, sh_data[1]->sh_size,
795 sh_data[1]->sh_offset);
797 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
798 "load_modmetadata: unable to load data: %d\n", err);
802 err = __elfN(parse_modmetadata)(fp, &ef, p_start, p_end);
804 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
805 "load_modmetadata: unable to parse metadata: %d\n", err);
810 if (shstrtab != NULL)
814 if (ef.firstpage != NULL)
822 __elfN(parse_modmetadata)(struct preloaded_file *fp, elf_file_t ef,
823 Elf_Addr p_start, Elf_Addr p_end)
825 struct mod_metadata md;
826 #if (defined(__i386__) || defined(__powerpc__)) && __ELF_WORD_SIZE == 64
827 struct mod_metadata64 md64;
828 #elif defined(__amd64__) && __ELF_WORD_SIZE == 32
829 struct mod_metadata32 md32;
831 struct mod_depend *mdepend;
832 struct mod_version mver;
834 int error, modcnt, minfolen;
840 COPYOUT(p, &v, sizeof(v));
841 error = __elfN(reloc_ptr)(fp, ef, p, &v, sizeof(v));
842 if (error == EOPNOTSUPP)
846 #if (defined(__i386__) || defined(__powerpc__)) && __ELF_WORD_SIZE == 64
847 COPYOUT(v, &md64, sizeof(md64));
848 error = __elfN(reloc_ptr)(fp, ef, v, &md64, sizeof(md64));
849 if (error == EOPNOTSUPP) {
850 md64.md_cval += ef->off;
851 md64.md_data += ef->off;
852 } else if (error != 0)
854 md.md_version = md64.md_version;
855 md.md_type = md64.md_type;
856 md.md_cval = (const char *)(uintptr_t)md64.md_cval;
857 md.md_data = (void *)(uintptr_t)md64.md_data;
858 #elif defined(__amd64__) && __ELF_WORD_SIZE == 32
859 COPYOUT(v, &md32, sizeof(md32));
860 error = __elfN(reloc_ptr)(fp, ef, v, &md32, sizeof(md32));
861 if (error == EOPNOTSUPP) {
862 md32.md_cval += ef->off;
863 md32.md_data += ef->off;
864 } else if (error != 0)
866 md.md_version = md32.md_version;
867 md.md_type = md32.md_type;
868 md.md_cval = (const char *)(uintptr_t)md32.md_cval;
869 md.md_data = (void *)(uintptr_t)md32.md_data;
871 COPYOUT(v, &md, sizeof(md));
872 error = __elfN(reloc_ptr)(fp, ef, v, &md, sizeof(md));
873 if (error == EOPNOTSUPP) {
874 md.md_cval += ef->off;
875 md.md_data += ef->off;
876 } else if (error != 0)
879 p += sizeof(Elf_Addr);
882 if (ef->kernel) /* kernel must not depend on anything */
884 s = strdupout((vm_offset_t)md.md_cval);
885 minfolen = sizeof(*mdepend) + strlen(s) + 1;
886 mdepend = malloc(minfolen);
889 COPYOUT((vm_offset_t)md.md_data, mdepend, sizeof(*mdepend));
890 strcpy((char*)(mdepend + 1), s);
892 file_addmetadata(fp, MODINFOMD_DEPLIST, minfolen, mdepend);
896 s = strdupout((vm_offset_t)md.md_cval);
897 COPYOUT((vm_offset_t)md.md_data, &mver, sizeof(mver));
898 file_addmodule(fp, s, mver.mv_version, NULL);
905 s = fake_modname(fp->f_name);
906 file_addmodule(fp, s, 1, NULL);
913 elf_hash(const char *name)
915 const unsigned char *p = (const unsigned char *) name;
921 if ((g = h & 0xf0000000) != 0)
928 static const char __elfN(bad_symtable)[] = "elf" __XSTRING(__ELF_WORD_SIZE) "_lookup_symbol: corrupt symbol table\n";
930 __elfN(lookup_symbol)(struct preloaded_file *fp, elf_file_t ef, const char* name,
938 hash = elf_hash(name);
939 COPYOUT(&ef->buckets[hash % ef->nbuckets], &symnum, sizeof(symnum));
941 while (symnum != STN_UNDEF) {
942 if (symnum >= ef->nchains) {
943 printf(__elfN(bad_symtable));
947 COPYOUT(ef->symtab + symnum, &sym, sizeof(sym));
948 if (sym.st_name == 0) {
949 printf(__elfN(bad_symtable));
953 strp = strdupout((vm_offset_t)(ef->strtab + sym.st_name));
954 if (strcmp(name, strp) == 0) {
956 if (sym.st_shndx != SHN_UNDEF ||
957 (sym.st_value != 0 &&
958 ELF_ST_TYPE(sym.st_info) == STT_FUNC)) {
965 COPYOUT(&ef->chains[symnum], &symnum, sizeof(symnum));
971 * Apply any intra-module relocations to the value. p is the load address
972 * of the value and val/len is the value to be modified. This does NOT modify
973 * the image in-place, because this is done by kern_linker later on.
975 * Returns EOPNOTSUPP if no relocation method is supplied.
978 __elfN(reloc_ptr)(struct preloaded_file *mp, elf_file_t ef,
979 Elf_Addr p, void *val, size_t len)
987 * The kernel is already relocated, but we still want to apply
988 * offset adjustments.
993 for (n = 0; n < ef->relsz / sizeof(r); n++) {
994 COPYOUT(ef->rel + n, &r, sizeof(r));
996 error = __elfN(reloc)(ef, __elfN(symaddr), &r, ELF_RELOC_REL,
997 ef->off, p, val, len);
1001 for (n = 0; n < ef->relasz / sizeof(a); n++) {
1002 COPYOUT(ef->rela + n, &a, sizeof(a));
1004 error = __elfN(reloc)(ef, __elfN(symaddr), &a, ELF_RELOC_RELA,
1005 ef->off, p, val, len);
1014 __elfN(symaddr)(struct elf_file *ef, Elf_Size symidx)
1017 /* Symbol lookup by index not required here. */