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>
32 #include <sys/endian.h>
34 #include <sys/linker.h>
35 #include <sys/module.h>
36 #include <sys/stdint.h>
38 #include <machine/elf.h>
41 #include <sys/link_elf.h>
43 #include "bootstrap.h"
45 #define COPYOUT(s,d,l) archsw.arch_copyout((vm_offset_t)(s), d, l)
47 #if defined(__i386__) && __ELF_WORD_SIZE == 64
50 #define ELF_TARG_CLASS ELFCLASS64
51 #define ELF_TARG_MACH EM_X86_64
54 typedef struct elf_file {
76 static int __elfN(loadimage)(struct preloaded_file *mp, elf_file_t ef,
78 static int __elfN(lookup_symbol)(struct preloaded_file *mp, elf_file_t ef,
79 const char* name, Elf_Sym* sym);
80 static int __elfN(reloc_ptr)(struct preloaded_file *mp, elf_file_t ef,
81 Elf_Addr p, void *val, size_t len);
82 static int __elfN(parse_modmetadata)(struct preloaded_file *mp, elf_file_t ef,
83 Elf_Addr p_start, Elf_Addr p_end);
84 static symaddr_fn __elfN(symaddr);
85 static char *fake_modname(const char *name);
87 const char *__elfN(kerneltype) = "elf kernel";
88 const char *__elfN(moduletype) = "elf module";
90 uint64_t __elfN(relocation_offset) = 0;
92 extern void elf_wrong_field_size(void);
93 #define CONVERT_FIELD(b, f, e) \
94 switch (sizeof((b)->f)) { \
96 (b)->f = e ## 16toh((b)->f); \
99 (b)->f = e ## 32toh((b)->f); \
102 (b)->f = e ## 64toh((b)->f); \
105 /* Force a link time error. */ \
106 elf_wrong_field_size(); \
110 #define CONVERT_SWITCH(h, d, f) \
111 switch ((h)->e_ident[EI_DATA]) { \
123 static int elf_header_convert(Elf_Ehdr *ehdr)
126 * Fixup ELF header endianness.
128 * The Xhdr structure was loaded using block read call to optimize file
129 * accesses. It might happen, that the endianness of the system memory
130 * is different that endianness of the ELF header. Swap fields here to
131 * guarantee that Xhdr always contain valid data regardless of
134 #define HEADER_FIELDS(b, e) \
135 CONVERT_FIELD(b, e_type, e); \
136 CONVERT_FIELD(b, e_machine, e); \
137 CONVERT_FIELD(b, e_version, e); \
138 CONVERT_FIELD(b, e_entry, e); \
139 CONVERT_FIELD(b, e_phoff, e); \
140 CONVERT_FIELD(b, e_shoff, e); \
141 CONVERT_FIELD(b, e_flags, e); \
142 CONVERT_FIELD(b, e_ehsize, e); \
143 CONVERT_FIELD(b, e_phentsize, e); \
144 CONVERT_FIELD(b, e_phnum, e); \
145 CONVERT_FIELD(b, e_shentsize, e); \
146 CONVERT_FIELD(b, e_shnum, e); \
147 CONVERT_FIELD(b, e_shstrndx, e)
149 CONVERT_SWITCH(ehdr, ehdr, HEADER_FIELDS);
156 static int elf_program_header_convert(const Elf_Ehdr *ehdr, Elf_Phdr *phdr)
158 #define PROGRAM_HEADER_FIELDS(b, e) \
159 CONVERT_FIELD(b, p_type, e); \
160 CONVERT_FIELD(b, p_flags, e); \
161 CONVERT_FIELD(b, p_offset, e); \
162 CONVERT_FIELD(b, p_vaddr, e); \
163 CONVERT_FIELD(b, p_paddr, e); \
164 CONVERT_FIELD(b, p_filesz, e); \
165 CONVERT_FIELD(b, p_memsz, e); \
166 CONVERT_FIELD(b, p_align, e)
168 CONVERT_SWITCH(ehdr, phdr, PROGRAM_HEADER_FIELDS);
170 #undef PROGRAM_HEADER_FIELDS
175 static int elf_section_header_convert(const Elf_Ehdr *ehdr, Elf_Shdr *shdr)
177 #define SECTION_HEADER_FIELDS(b, e) \
178 CONVERT_FIELD(b, sh_name, e); \
179 CONVERT_FIELD(b, sh_type, e); \
180 CONVERT_FIELD(b, sh_link, e); \
181 CONVERT_FIELD(b, sh_info, e); \
182 CONVERT_FIELD(b, sh_flags, e); \
183 CONVERT_FIELD(b, sh_addr, e); \
184 CONVERT_FIELD(b, sh_offset, e); \
185 CONVERT_FIELD(b, sh_size, e); \
186 CONVERT_FIELD(b, sh_addralign, e); \
187 CONVERT_FIELD(b, sh_entsize, e)
189 CONVERT_SWITCH(ehdr, shdr, SECTION_HEADER_FIELDS);
191 #undef SECTION_HEADER_FIELDS
195 #undef CONVERT_SWITCH
199 __elfN(load_elf_header)(char *filename, elf_file_t ef)
206 * Open the image, read and validate the ELF header
208 if (filename == NULL) /* can't handle nameless */
210 if ((ef->fd = open(filename, O_RDONLY)) == -1)
212 ef->firstpage = malloc(PAGE_SIZE);
213 if (ef->firstpage == NULL) {
217 bytes_read = read(ef->fd, ef->firstpage, PAGE_SIZE);
218 ef->firstlen = (size_t)bytes_read;
219 if (bytes_read < 0 || ef->firstlen <= sizeof(Elf_Ehdr)) {
220 err = EFTYPE; /* could be EIO, but may be small file */
223 ehdr = ef->ehdr = (Elf_Ehdr *)ef->firstpage;
226 if (!IS_ELF(*ehdr)) {
231 if (ehdr->e_ident[EI_CLASS] != ELF_TARG_CLASS || /* Layout ? */
232 ehdr->e_ident[EI_DATA] != ELF_TARG_DATA ||
233 ehdr->e_ident[EI_VERSION] != EV_CURRENT) /* Version ? */ {
238 err = elf_header_convert(ehdr);
242 if (ehdr->e_version != EV_CURRENT || ehdr->e_machine != ELF_TARG_MACH) {
251 if (ef->firstpage != NULL) {
253 ef->firstpage = NULL;
263 * Attempt to load the file (file) as an ELF module. It will be stored at
264 * (dest), and a pointer to a module structure describing the loaded object
265 * will be saved in (result).
268 __elfN(loadfile)(char *filename, uint64_t dest, struct preloaded_file **result)
270 return (__elfN(loadfile_raw)(filename, dest, result, 0));
274 __elfN(loadfile_raw)(char *filename, uint64_t dest,
275 struct preloaded_file **result, int multiboot)
277 struct preloaded_file *fp, *kfp;
283 bzero(&ef, sizeof(struct elf_file));
286 err = __elfN(load_elf_header)(filename, &ef);
293 * Check to see what sort of module we are.
295 kfp = file_findfile(NULL, __elfN(kerneltype));
298 * Kernels can be ET_DYN, so just assume the first loaded object is the
299 * kernel. This assumption will be checked later.
304 if (ef.kernel || ehdr->e_type == ET_EXEC) {
305 /* Looks like a kernel */
307 printf("elf" __XSTRING(__ELF_WORD_SIZE)
308 "_loadfile: kernel already loaded\n");
313 * Calculate destination address based on kernel entrypoint.
315 * For ARM, the destination address is independent of any values
316 * in the elf header (an ARM kernel can be loaded at any 2MB
317 * boundary), so we leave dest set to the value calculated by
318 * archsw.arch_loadaddr() and passed in to this function.
321 if (ehdr->e_type == ET_EXEC)
322 dest = (ehdr->e_entry & ~PAGE_MASK);
324 if ((ehdr->e_entry & ~PAGE_MASK) == 0) {
325 printf("elf" __XSTRING(__ELF_WORD_SIZE)
326 "_loadfile: not a kernel (maybe static binary?)\n");
332 } else if (ehdr->e_type == ET_DYN) {
333 /* Looks like a kld module */
334 if (multiboot != 0) {
335 printf("elf" __XSTRING(__ELF_WORD_SIZE)
336 "_loadfile: can't load module as multiboot\n");
341 printf("elf" __XSTRING(__ELF_WORD_SIZE)
342 "_loadfile: can't load module before kernel\n");
346 if (strcmp(__elfN(kerneltype), kfp->f_type)) {
347 printf("elf" __XSTRING(__ELF_WORD_SIZE)
348 "_loadfile: can't load module with kernel type '%s'\n",
353 /* Looks OK, got ahead */
361 if (archsw.arch_loadaddr != NULL)
362 dest = archsw.arch_loadaddr(LOAD_ELF, ehdr, dest);
364 dest = roundup(dest, PAGE_SIZE);
367 * Ok, we think we should handle this.
371 printf("elf" __XSTRING(__ELF_WORD_SIZE)
372 "_loadfile: cannot allocate module info\n");
376 if (ef.kernel == 1 && multiboot == 0)
377 setenv("kernelname", filename, 1);
378 fp->f_name = strdup(filename);
380 fp->f_type = strdup(ef.kernel ?
381 __elfN(kerneltype) : __elfN(moduletype));
383 fp->f_type = strdup("elf multiboot kernel");
387 printf("%s entry at 0x%jx\n", filename,
388 (uintmax_t)ehdr->e_entry);
390 printf("%s ", filename);
393 fp->f_size = __elfN(loadimage)(fp, &ef, dest);
394 if (fp->f_size == 0 || fp->f_addr == 0)
397 /* save exec header as metadata */
398 file_addmetadata(fp, MODINFOMD_ELFHDR, sizeof(*ehdr), ehdr);
400 /* Load OK, return module pointer */
401 *result = (struct preloaded_file *)fp;
418 * With the file (fd) open on the image, and (ehdr) containing
419 * the Elf header, load the image at (off)
422 __elfN(loadimage)(struct preloaded_file *fp, elf_file_t ef, uint64_t off)
427 Elf_Phdr *phdr, *php;
431 vm_offset_t firstaddr;
432 vm_offset_t lastaddr;
445 Elf_Addr p_start, p_end;
450 firstaddr = lastaddr = 0;
452 if (ehdr->e_type == ET_EXEC) {
453 #if defined(__i386__) || defined(__amd64__)
454 #if __ELF_WORD_SIZE == 64
455 /* x86_64 relocates after locore */
456 off = - (off & 0xffffffffff000000ull);
458 /* i386 relocates after locore */
459 off = - (off & 0xff000000u);
461 #elif defined(__powerpc__)
463 * On the purely virtual memory machines like e500, the kernel
464 * is linked against its final VA range, which is most often
465 * not available at the loader stage, but only after kernel
466 * initializes and completes its VM settings. In such cases we
467 * cannot use p_vaddr field directly to load ELF segments, but
468 * put them at some 'load-time' locations.
470 if (off & 0xf0000000u) {
471 off = -(off & 0xf0000000u);
473 * XXX the physical load address should not be
474 * hardcoded. Note that the Book-E kernel assumes that
475 * it's loaded at a 16MB boundary for now...
478 ehdr->e_entry += off;
480 printf("Converted entry 0x%08x\n", ehdr->e_entry);
484 #elif defined(__arm__) && !defined(EFI)
486 * The elf headers in arm kernels specify virtual addresses in
487 * all header fields, even the ones that should be physical
488 * addresses. We assume the entry point is in the first page,
489 * and masking the page offset will leave us with the virtual
490 * address the kernel was linked at. We subtract that from the
491 * load offset, making 'off' into the value which, when added
492 * to a virtual address in an elf header, translates it to a
493 * physical address. We do the va->pa conversion on the entry
494 * point address in the header now, so that later we can launch
495 * the kernel by just jumping to that address.
497 * When booting from UEFI the copyin and copyout functions
498 * handle adjusting the location relative to the first virtual
499 * address. Because of this there is no need to adjust the
500 * offset or entry point address as these will both be handled
503 off -= ehdr->e_entry & ~PAGE_MASK;
504 ehdr->e_entry += off;
506 printf("ehdr->e_entry 0x%08x, va<->pa off %llx\n",
510 off = 0; /* other archs use direct mapped kernels */
516 __elfN(relocation_offset) = off;
518 if ((ehdr->e_phoff + ehdr->e_phnum * sizeof(*phdr)) > ef->firstlen) {
519 printf("elf" __XSTRING(__ELF_WORD_SIZE)
520 "_loadimage: program header not within first page\n");
523 phdr = (Elf_Phdr *)(ef->firstpage + ehdr->e_phoff);
525 for (i = 0; i < ehdr->e_phnum; i++) {
526 if (elf_program_header_convert(ehdr, phdr))
529 /* We want to load PT_LOAD segments only.. */
530 if (phdr[i].p_type != PT_LOAD)
534 printf("Segment: 0x%lx@0x%lx -> 0x%lx-0x%lx",
535 (long)phdr[i].p_filesz, (long)phdr[i].p_offset,
536 (long)(phdr[i].p_vaddr + off),
537 (long)(phdr[i].p_vaddr + off + phdr[i].p_memsz - 1));
539 if ((phdr[i].p_flags & PF_W) == 0) {
540 printf("text=0x%lx ", (long)phdr[i].p_filesz);
542 printf("data=0x%lx", (long)phdr[i].p_filesz);
543 if (phdr[i].p_filesz < phdr[i].p_memsz)
544 printf("+0x%lx", (long)(phdr[i].p_memsz -
550 if (ef->firstlen > phdr[i].p_offset) {
551 fpcopy = ef->firstlen - phdr[i].p_offset;
552 archsw.arch_copyin(ef->firstpage + phdr[i].p_offset,
553 phdr[i].p_vaddr + off, fpcopy);
555 if (phdr[i].p_filesz > fpcopy) {
556 if (kern_pread(ef->fd, phdr[i].p_vaddr + off + fpcopy,
557 phdr[i].p_filesz - fpcopy,
558 phdr[i].p_offset + fpcopy) != 0) {
559 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
560 "_loadimage: read failed\n");
564 /* clear space from oversized segments; eg: bss */
565 if (phdr[i].p_filesz < phdr[i].p_memsz) {
567 printf(" (bss: 0x%lx-0x%lx)",
568 (long)(phdr[i].p_vaddr + off + phdr[i].p_filesz),
569 (long)(phdr[i].p_vaddr + off + phdr[i].p_memsz -1));
572 kern_bzero(phdr[i].p_vaddr + off + phdr[i].p_filesz,
573 phdr[i].p_memsz - phdr[i].p_filesz);
579 if (archsw.arch_loadseg != NULL)
580 archsw.arch_loadseg(ehdr, phdr + i, off);
582 if (firstaddr == 0 || firstaddr > (phdr[i].p_vaddr + off))
583 firstaddr = phdr[i].p_vaddr + off;
584 if (lastaddr == 0 || lastaddr <
585 (phdr[i].p_vaddr + off + phdr[i].p_memsz))
586 lastaddr = phdr[i].p_vaddr + off + phdr[i].p_memsz;
588 lastaddr = roundup(lastaddr, sizeof(long));
591 * Get the section headers. We need this for finding the .ctors
592 * section as well as for loading any symbols. Both may be hard
593 * to do if reading from a .gz file as it involves seeking. I
594 * think the rule is going to have to be that you must strip a
595 * file to remove symbols before gzipping it.
597 chunk = (size_t)ehdr->e_shnum * (size_t)ehdr->e_shentsize;
598 if (chunk == 0 || ehdr->e_shoff == 0)
600 shdr = alloc_pread(ef->fd, ehdr->e_shoff, chunk);
602 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
603 "_loadimage: failed to read section headers");
607 for (i = 0; i < ehdr->e_shnum; i++)
608 elf_section_header_convert(ehdr, &shdr[i]);
610 file_addmetadata(fp, MODINFOMD_SHDR, chunk, shdr);
613 * Read the section string table and look for the .ctors section.
614 * We need to tell the kernel where it is so that it can call the
617 chunk = shdr[ehdr->e_shstrndx].sh_size;
619 shstr = alloc_pread(ef->fd, shdr[ehdr->e_shstrndx].sh_offset,
622 for (i = 0; i < ehdr->e_shnum; i++) {
623 if (strcmp(shstr + shdr[i].sh_name,
626 ctors = shdr[i].sh_addr;
627 file_addmetadata(fp, MODINFOMD_CTORS_ADDR,
628 sizeof(ctors), &ctors);
629 size = shdr[i].sh_size;
630 file_addmetadata(fp, MODINFOMD_CTORS_SIZE,
631 sizeof(size), &size);
639 * Now load any symbols.
643 for (i = 0; i < ehdr->e_shnum; i++) {
644 if (shdr[i].sh_type != SHT_SYMTAB)
646 for (j = 0; j < ehdr->e_phnum; j++) {
647 if (phdr[j].p_type != PT_LOAD)
649 if (shdr[i].sh_offset >= phdr[j].p_offset &&
650 (shdr[i].sh_offset + shdr[i].sh_size <=
651 phdr[j].p_offset + phdr[j].p_filesz)) {
652 shdr[i].sh_offset = 0;
657 if (shdr[i].sh_offset == 0 || shdr[i].sh_size == 0)
658 continue; /* alread loaded in a PT_LOAD above */
659 /* Save it for loading below */
661 symstrindex = shdr[i].sh_link;
663 if (symtabindex < 0 || symstrindex < 0)
666 /* Ok, committed to a load. */
671 for (i = symtabindex; i >= 0; i = symstrindex) {
675 switch(shdr[i].sh_type) {
676 case SHT_SYMTAB: /* Symbol table */
679 case SHT_STRTAB: /* String table */
687 size = shdr[i].sh_size;
688 #if defined(__powerpc__)
689 #if __ELF_WORD_SIZE == 64
690 size = htobe64(size);
692 size = htobe32(size);
696 archsw.arch_copyin(&size, lastaddr, sizeof(size));
697 lastaddr += sizeof(size);
700 printf("\n%s: 0x%jx@0x%jx -> 0x%jx-0x%jx", secname,
701 (uintmax_t)shdr[i].sh_size, (uintmax_t)shdr[i].sh_offset,
703 (uintmax_t)(lastaddr + shdr[i].sh_size));
705 if (i == symstrindex)
707 printf("0x%lx+0x%lx", (long)sizeof(size), (long)size);
710 if (lseek(ef->fd, (off_t)shdr[i].sh_offset, SEEK_SET) == -1) {
711 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
712 "_loadimage: could not seek for symbols - skipped!");
717 result = archsw.arch_readin(ef->fd, lastaddr, shdr[i].sh_size);
718 if (result < 0 || (size_t)result != shdr[i].sh_size) {
719 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
720 "_loadimage: could not read symbols - skipped! "
721 "(%ju != %ju)", (uintmax_t)result,
722 (uintmax_t)shdr[i].sh_size);
727 /* Reset offsets relative to ssym */
728 lastaddr += shdr[i].sh_size;
729 lastaddr = roundup(lastaddr, sizeof(size));
730 if (i == symtabindex)
732 else if (i == symstrindex)
740 #if defined(__powerpc__)
741 /* On PowerPC we always need to provide BE data to the kernel */
742 #if __ELF_WORD_SIZE == 64
743 ssym = htobe64((uint64_t)ssym);
744 esym = htobe64((uint64_t)esym);
746 ssym = htobe32((uint32_t)ssym);
747 esym = htobe32((uint32_t)esym);
751 file_addmetadata(fp, MODINFOMD_SSYM, sizeof(ssym), &ssym);
752 file_addmetadata(fp, MODINFOMD_ESYM, sizeof(esym), &esym);
757 ret = lastaddr - firstaddr;
758 fp->f_addr = firstaddr;
761 for (i = 0; i < ehdr->e_phnum; i++) {
762 if (phdr[i].p_type == PT_DYNAMIC) {
765 file_addmetadata(fp, MODINFOMD_DYNAMIC, sizeof(adp),
771 if (php == NULL) /* this is bad, we cannot get to symbols or _DYNAMIC */
774 ndp = php->p_filesz / sizeof(Elf_Dyn);
777 dp = malloc(php->p_filesz);
780 archsw.arch_copyout(php->p_vaddr + off, dp, php->p_filesz);
783 for (i = 0; i < ndp; i++) {
784 if (dp[i].d_tag == 0)
786 switch (dp[i].d_tag) {
789 (Elf_Hashelt*)(uintptr_t)(dp[i].d_un.d_ptr + off);
793 (char *)(uintptr_t)(dp[i].d_un.d_ptr + off);
796 ef->strsz = dp[i].d_un.d_val;
800 (Elf_Sym *)(uintptr_t)(dp[i].d_un.d_ptr + off);
804 (Elf_Rel *)(uintptr_t)(dp[i].d_un.d_ptr + off);
807 ef->relsz = dp[i].d_un.d_val;
811 (Elf_Rela *)(uintptr_t)(dp[i].d_un.d_ptr + off);
814 ef->relasz = dp[i].d_un.d_val;
820 if (ef->hashtab == NULL || ef->symtab == NULL ||
821 ef->strtab == NULL || ef->strsz == 0)
823 COPYOUT(ef->hashtab, &ef->nbuckets, sizeof(ef->nbuckets));
824 COPYOUT(ef->hashtab + 1, &ef->nchains, sizeof(ef->nchains));
825 ef->buckets = ef->hashtab + 2;
826 ef->chains = ef->buckets + ef->nbuckets;
828 if (__elfN(lookup_symbol)(fp, ef, "__start_set_modmetadata_set",
831 p_start = sym.st_value + ef->off;
832 if (__elfN(lookup_symbol)(fp, ef, "__stop_set_modmetadata_set",
835 p_end = sym.st_value + ef->off;
837 if (__elfN(parse_modmetadata)(fp, ef, p_start, p_end) == 0)
840 if (ef->kernel) /* kernel must not depend on anything */
851 static char invalid_name[] = "bad";
854 fake_modname(const char *name)
860 sp = strrchr(name, '/');
866 ep = strrchr(sp, '.');
868 ep = sp + strlen(sp);
872 ep = invalid_name + sizeof(invalid_name) - 1;
876 fp = malloc(len + 1);
884 #if (defined(__i386__) || defined(__powerpc__)) && __ELF_WORD_SIZE == 64
885 struct mod_metadata64 {
886 int md_version; /* structure version MDTV_* */
887 int md_type; /* type of entry MDT_* */
888 uint64_t md_data; /* specific data */
889 uint64_t md_cval; /* common string label */
892 #if defined(__amd64__) && __ELF_WORD_SIZE == 32
893 struct mod_metadata32 {
894 int md_version; /* structure version MDTV_* */
895 int md_type; /* type of entry MDT_* */
896 uint32_t md_data; /* specific data */
897 uint32_t md_cval; /* common string label */
902 __elfN(load_modmetadata)(struct preloaded_file *fp, uint64_t dest)
906 Elf_Shdr *sh_meta, *shdr = NULL;
907 Elf_Shdr *sh_data[2];
908 char *shstrtab = NULL;
910 Elf_Addr p_start, p_end;
912 bzero(&ef, sizeof(struct elf_file));
915 err = __elfN(load_elf_header)(fp->f_name, &ef);
919 if (ef.kernel == 1 || ef.ehdr->e_type == ET_EXEC) {
921 } else if (ef.ehdr->e_type != ET_DYN) {
926 size = (size_t)ef.ehdr->e_shnum * (size_t)ef.ehdr->e_shentsize;
927 shdr = alloc_pread(ef.fd, ef.ehdr->e_shoff, size);
934 shstrtab = alloc_pread(ef.fd, shdr[ef.ehdr->e_shstrndx].sh_offset,
935 shdr[ef.ehdr->e_shstrndx].sh_size);
936 if (shstrtab == NULL) {
937 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
938 "load_modmetadata: unable to load shstrtab\n");
943 /* Find set_modmetadata_set and data sections. */
944 sh_data[0] = sh_data[1] = sh_meta = NULL;
945 for (i = 0, j = 0; i < ef.ehdr->e_shnum; i++) {
946 if (strcmp(&shstrtab[shdr[i].sh_name],
947 "set_modmetadata_set") == 0) {
950 if ((strcmp(&shstrtab[shdr[i].sh_name], ".data") == 0) ||
951 (strcmp(&shstrtab[shdr[i].sh_name], ".rodata") == 0)) {
952 sh_data[j++] = &shdr[i];
955 if (sh_meta == NULL || sh_data[0] == NULL || sh_data[1] == NULL) {
956 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
957 "load_modmetadata: unable to find set_modmetadata_set or data sections\n");
962 /* Load set_modmetadata_set into memory */
963 err = kern_pread(ef.fd, dest, sh_meta->sh_size, sh_meta->sh_offset);
965 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
966 "load_modmetadata: unable to load set_modmetadata_set: %d\n", err);
970 p_end = dest + sh_meta->sh_size;
971 dest += sh_meta->sh_size;
973 /* Load data sections into memory. */
974 err = kern_pread(ef.fd, dest, sh_data[0]->sh_size,
975 sh_data[0]->sh_offset);
977 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
978 "load_modmetadata: unable to load data: %d\n", err);
983 * We have to increment the dest, so that the offset is the same into
984 * both the .rodata and .data sections.
986 ef.off = -(sh_data[0]->sh_addr - dest);
987 dest += (sh_data[1]->sh_addr - sh_data[0]->sh_addr);
989 err = kern_pread(ef.fd, dest, sh_data[1]->sh_size,
990 sh_data[1]->sh_offset);
992 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
993 "load_modmetadata: unable to load data: %d\n", err);
997 err = __elfN(parse_modmetadata)(fp, &ef, p_start, p_end);
999 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
1000 "load_modmetadata: unable to parse metadata: %d\n", err);
1005 if (shstrtab != NULL)
1009 if (ef.firstpage != NULL)
1017 __elfN(parse_modmetadata)(struct preloaded_file *fp, elf_file_t ef,
1018 Elf_Addr p_start, Elf_Addr p_end)
1020 struct mod_metadata md;
1021 #if (defined(__i386__) || defined(__powerpc__)) && __ELF_WORD_SIZE == 64
1022 struct mod_metadata64 md64;
1023 #elif defined(__amd64__) && __ELF_WORD_SIZE == 32
1024 struct mod_metadata32 md32;
1026 struct mod_depend *mdepend;
1027 struct mod_version mver;
1029 int error, modcnt, minfolen;
1035 COPYOUT(p, &v, sizeof(v));
1036 error = __elfN(reloc_ptr)(fp, ef, p, &v, sizeof(v));
1037 if (error == EOPNOTSUPP)
1039 else if (error != 0)
1041 #if (defined(__i386__) || defined(__powerpc__)) && __ELF_WORD_SIZE == 64
1042 COPYOUT(v, &md64, sizeof(md64));
1043 error = __elfN(reloc_ptr)(fp, ef, v, &md64, sizeof(md64));
1044 if (error == EOPNOTSUPP) {
1045 md64.md_cval += ef->off;
1046 md64.md_data += ef->off;
1047 } else if (error != 0)
1049 md.md_version = md64.md_version;
1050 md.md_type = md64.md_type;
1051 md.md_cval = (const char *)(uintptr_t)md64.md_cval;
1052 md.md_data = (void *)(uintptr_t)md64.md_data;
1053 #elif defined(__amd64__) && __ELF_WORD_SIZE == 32
1054 COPYOUT(v, &md32, sizeof(md32));
1055 error = __elfN(reloc_ptr)(fp, ef, v, &md32, sizeof(md32));
1056 if (error == EOPNOTSUPP) {
1057 md32.md_cval += ef->off;
1058 md32.md_data += ef->off;
1059 } else if (error != 0)
1061 md.md_version = md32.md_version;
1062 md.md_type = md32.md_type;
1063 md.md_cval = (const char *)(uintptr_t)md32.md_cval;
1064 md.md_data = (void *)(uintptr_t)md32.md_data;
1066 COPYOUT(v, &md, sizeof(md));
1067 error = __elfN(reloc_ptr)(fp, ef, v, &md, sizeof(md));
1068 if (error == EOPNOTSUPP) {
1069 md.md_cval += ef->off;
1070 md.md_data = (void *)((uintptr_t)md.md_data +
1071 (uintptr_t)ef->off);
1072 } else if (error != 0)
1075 p += sizeof(Elf_Addr);
1076 switch(md.md_type) {
1078 if (ef->kernel) /* kernel must not depend on anything */
1080 s = strdupout((vm_offset_t)md.md_cval);
1081 minfolen = sizeof(*mdepend) + strlen(s) + 1;
1082 mdepend = malloc(minfolen);
1083 if (mdepend == NULL)
1085 COPYOUT((vm_offset_t)md.md_data, mdepend,
1087 strcpy((char*)(mdepend + 1), s);
1089 file_addmetadata(fp, MODINFOMD_DEPLIST, minfolen,
1094 s = strdupout((vm_offset_t)md.md_cval);
1095 COPYOUT((vm_offset_t)md.md_data, &mver, sizeof(mver));
1096 file_addmodule(fp, s, mver.mv_version, NULL);
1103 s = fake_modname(fp->f_name);
1104 file_addmodule(fp, s, 1, NULL);
1110 static unsigned long
1111 elf_hash(const char *name)
1113 const unsigned char *p = (const unsigned char *) name;
1114 unsigned long h = 0;
1117 while (*p != '\0') {
1118 h = (h << 4) + *p++;
1119 if ((g = h & 0xf0000000) != 0)
1126 static const char __elfN(bad_symtable)[] = "elf" __XSTRING(__ELF_WORD_SIZE)
1127 "_lookup_symbol: corrupt symbol table\n";
1129 __elfN(lookup_symbol)(struct preloaded_file *fp, elf_file_t ef,
1130 const char* name, Elf_Sym *symp)
1137 hash = elf_hash(name);
1138 COPYOUT(&ef->buckets[hash % ef->nbuckets], &symnum, sizeof(symnum));
1140 while (symnum != STN_UNDEF) {
1141 if (symnum >= ef->nchains) {
1142 printf(__elfN(bad_symtable));
1146 COPYOUT(ef->symtab + symnum, &sym, sizeof(sym));
1147 if (sym.st_name == 0) {
1148 printf(__elfN(bad_symtable));
1152 strp = strdupout((vm_offset_t)(ef->strtab + sym.st_name));
1153 if (strcmp(name, strp) == 0) {
1155 if (sym.st_shndx != SHN_UNDEF ||
1156 (sym.st_value != 0 &&
1157 ELF_ST_TYPE(sym.st_info) == STT_FUNC)) {
1164 COPYOUT(&ef->chains[symnum], &symnum, sizeof(symnum));
1170 * Apply any intra-module relocations to the value. p is the load address
1171 * of the value and val/len is the value to be modified. This does NOT modify
1172 * the image in-place, because this is done by kern_linker later on.
1174 * Returns EOPNOTSUPP if no relocation method is supplied.
1177 __elfN(reloc_ptr)(struct preloaded_file *mp, elf_file_t ef,
1178 Elf_Addr p, void *val, size_t len)
1186 * The kernel is already relocated, but we still want to apply
1187 * offset adjustments.
1190 return (EOPNOTSUPP);
1192 for (n = 0; n < ef->relsz / sizeof(r); n++) {
1193 COPYOUT(ef->rel + n, &r, sizeof(r));
1195 error = __elfN(reloc)(ef, __elfN(symaddr), &r, ELF_RELOC_REL,
1196 ef->off, p, val, len);
1200 for (n = 0; n < ef->relasz / sizeof(a); n++) {
1201 COPYOUT(ef->rela + n, &a, sizeof(a));
1203 error = __elfN(reloc)(ef, __elfN(symaddr), &a, ELF_RELOC_RELA,
1204 ef->off, p, val, len);
1213 __elfN(symaddr)(struct elf_file *ef, Elf_Size symidx)
1216 /* Symbol lookup by index not required here. */