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 {
74 #ifdef LOADER_VERIEXEC_VECTX
79 #ifdef LOADER_VERIEXEC_VECTX
80 #define VECTX_HANDLE(ef) (ef)->vctx
82 #define VECTX_HANDLE(ef) (ef)->fd
85 static int __elfN(loadimage)(struct preloaded_file *mp, elf_file_t ef,
87 static int __elfN(lookup_symbol)(struct preloaded_file *mp, elf_file_t ef,
88 const char* name, Elf_Sym* sym);
89 static int __elfN(reloc_ptr)(struct preloaded_file *mp, elf_file_t ef,
90 Elf_Addr p, void *val, size_t len);
91 static int __elfN(parse_modmetadata)(struct preloaded_file *mp, elf_file_t ef,
92 Elf_Addr p_start, Elf_Addr p_end);
93 static symaddr_fn __elfN(symaddr);
94 static char *fake_modname(const char *name);
96 const char *__elfN(kerneltype) = "elf kernel";
97 const char *__elfN(moduletype) = "elf module";
99 uint64_t __elfN(relocation_offset) = 0;
101 extern void elf_wrong_field_size(void);
102 #define CONVERT_FIELD(b, f, e) \
103 switch (sizeof((b)->f)) { \
105 (b)->f = e ## 16toh((b)->f); \
108 (b)->f = e ## 32toh((b)->f); \
111 (b)->f = e ## 64toh((b)->f); \
114 /* Force a link time error. */ \
115 elf_wrong_field_size(); \
119 #define CONVERT_SWITCH(h, d, f) \
120 switch ((h)->e_ident[EI_DATA]) { \
132 static int elf_header_convert(Elf_Ehdr *ehdr)
135 * Fixup ELF header endianness.
137 * The Xhdr structure was loaded using block read call to optimize file
138 * accesses. It might happen, that the endianness of the system memory
139 * is different that endianness of the ELF header. Swap fields here to
140 * guarantee that Xhdr always contain valid data regardless of
143 #define HEADER_FIELDS(b, e) \
144 CONVERT_FIELD(b, e_type, e); \
145 CONVERT_FIELD(b, e_machine, e); \
146 CONVERT_FIELD(b, e_version, e); \
147 CONVERT_FIELD(b, e_entry, e); \
148 CONVERT_FIELD(b, e_phoff, e); \
149 CONVERT_FIELD(b, e_shoff, e); \
150 CONVERT_FIELD(b, e_flags, e); \
151 CONVERT_FIELD(b, e_ehsize, e); \
152 CONVERT_FIELD(b, e_phentsize, e); \
153 CONVERT_FIELD(b, e_phnum, e); \
154 CONVERT_FIELD(b, e_shentsize, e); \
155 CONVERT_FIELD(b, e_shnum, e); \
156 CONVERT_FIELD(b, e_shstrndx, e)
158 CONVERT_SWITCH(ehdr, ehdr, HEADER_FIELDS);
165 static int elf_program_header_convert(const Elf_Ehdr *ehdr, Elf_Phdr *phdr)
167 #define PROGRAM_HEADER_FIELDS(b, e) \
168 CONVERT_FIELD(b, p_type, e); \
169 CONVERT_FIELD(b, p_flags, e); \
170 CONVERT_FIELD(b, p_offset, e); \
171 CONVERT_FIELD(b, p_vaddr, e); \
172 CONVERT_FIELD(b, p_paddr, e); \
173 CONVERT_FIELD(b, p_filesz, e); \
174 CONVERT_FIELD(b, p_memsz, e); \
175 CONVERT_FIELD(b, p_align, e)
177 CONVERT_SWITCH(ehdr, phdr, PROGRAM_HEADER_FIELDS);
179 #undef PROGRAM_HEADER_FIELDS
184 static int elf_section_header_convert(const Elf_Ehdr *ehdr, Elf_Shdr *shdr)
186 #define SECTION_HEADER_FIELDS(b, e) \
187 CONVERT_FIELD(b, sh_name, e); \
188 CONVERT_FIELD(b, sh_type, e); \
189 CONVERT_FIELD(b, sh_link, e); \
190 CONVERT_FIELD(b, sh_info, e); \
191 CONVERT_FIELD(b, sh_flags, e); \
192 CONVERT_FIELD(b, sh_addr, e); \
193 CONVERT_FIELD(b, sh_offset, e); \
194 CONVERT_FIELD(b, sh_size, e); \
195 CONVERT_FIELD(b, sh_addralign, e); \
196 CONVERT_FIELD(b, sh_entsize, e)
198 CONVERT_SWITCH(ehdr, shdr, SECTION_HEADER_FIELDS);
200 #undef SECTION_HEADER_FIELDS
204 #undef CONVERT_SWITCH
208 __elfN(load_elf_header)(char *filename, elf_file_t ef)
215 * Open the image, read and validate the ELF header
217 if (filename == NULL) /* can't handle nameless */
219 if ((ef->fd = open(filename, O_RDONLY)) == -1)
221 ef->firstpage = malloc(PAGE_SIZE);
222 if (ef->firstpage == NULL) {
226 #ifdef LOADER_VERIEXEC_VECTX
230 ef->vctx = vectx_open(ef->fd, filename, 0L, NULL, &verror, __func__);
232 printf("Unverified %s: %s\n", filename, ve_error_get());
239 bytes_read = VECTX_READ(VECTX_HANDLE(ef), ef->firstpage, PAGE_SIZE);
240 ef->firstlen = (size_t)bytes_read;
241 if (bytes_read < 0 || ef->firstlen <= sizeof(Elf_Ehdr)) {
242 err = EFTYPE; /* could be EIO, but may be small file */
245 ehdr = ef->ehdr = (Elf_Ehdr *)ef->firstpage;
248 if (!IS_ELF(*ehdr)) {
253 if (ehdr->e_ident[EI_CLASS] != ELF_TARG_CLASS || /* Layout ? */
254 ehdr->e_ident[EI_DATA] != ELF_TARG_DATA ||
255 ehdr->e_ident[EI_VERSION] != EV_CURRENT) /* Version ? */ {
260 err = elf_header_convert(ehdr);
264 if (ehdr->e_version != EV_CURRENT || ehdr->e_machine != ELF_TARG_MACH) {
270 #if defined(LOADER_VERIEXEC) && !defined(LOADER_VERIEXEC_VECTX)
271 if (verify_file(ef->fd, filename, bytes_read, VE_MUST, __func__) < 0) {
279 if (ef->firstpage != NULL) {
281 ef->firstpage = NULL;
284 #ifdef LOADER_VERIEXEC_VECTX
294 * Attempt to load the file (file) as an ELF module. It will be stored at
295 * (dest), and a pointer to a module structure describing the loaded object
296 * will be saved in (result).
299 __elfN(loadfile)(char *filename, uint64_t dest, struct preloaded_file **result)
301 return (__elfN(loadfile_raw)(filename, dest, result, 0));
305 __elfN(loadfile_raw)(char *filename, uint64_t dest,
306 struct preloaded_file **result, int multiboot)
308 struct preloaded_file *fp, *kfp;
314 bzero(&ef, sizeof(struct elf_file));
317 err = __elfN(load_elf_header)(filename, &ef);
324 * Check to see what sort of module we are.
326 kfp = file_findfile(NULL, __elfN(kerneltype));
329 * Kernels can be ET_DYN, so just assume the first loaded object is the
330 * kernel. This assumption will be checked later.
335 if (ef.kernel || ehdr->e_type == ET_EXEC) {
336 /* Looks like a kernel */
338 printf("elf" __XSTRING(__ELF_WORD_SIZE)
339 "_loadfile: kernel already loaded\n");
344 * Calculate destination address based on kernel entrypoint.
346 * For ARM, the destination address is independent of any values
347 * in the elf header (an ARM kernel can be loaded at any 2MB
348 * boundary), so we leave dest set to the value calculated by
349 * archsw.arch_loadaddr() and passed in to this function.
352 if (ehdr->e_type == ET_EXEC)
353 dest = (ehdr->e_entry & ~PAGE_MASK);
355 if ((ehdr->e_entry & ~PAGE_MASK) == 0) {
356 printf("elf" __XSTRING(__ELF_WORD_SIZE)
357 "_loadfile: not a kernel (maybe static binary?)\n");
363 } else if (ehdr->e_type == ET_DYN) {
364 /* Looks like a kld module */
365 if (multiboot != 0) {
366 printf("elf" __XSTRING(__ELF_WORD_SIZE)
367 "_loadfile: can't load module as multiboot\n");
372 printf("elf" __XSTRING(__ELF_WORD_SIZE)
373 "_loadfile: can't load module before kernel\n");
377 if (strcmp(__elfN(kerneltype), kfp->f_type)) {
378 printf("elf" __XSTRING(__ELF_WORD_SIZE)
379 "_loadfile: can't load module with kernel type '%s'\n",
384 /* Looks OK, got ahead */
392 if (archsw.arch_loadaddr != NULL)
393 dest = archsw.arch_loadaddr(LOAD_ELF, ehdr, dest);
395 dest = roundup(dest, PAGE_SIZE);
398 * Ok, we think we should handle this.
402 printf("elf" __XSTRING(__ELF_WORD_SIZE)
403 "_loadfile: cannot allocate module info\n");
407 if (ef.kernel == 1 && multiboot == 0)
408 setenv("kernelname", filename, 1);
409 fp->f_name = strdup(filename);
411 fp->f_type = strdup(ef.kernel ?
412 __elfN(kerneltype) : __elfN(moduletype));
414 fp->f_type = strdup("elf multiboot kernel");
418 printf("%s entry at 0x%jx\n", filename,
419 (uintmax_t)ehdr->e_entry);
421 printf("%s ", filename);
424 fp->f_size = __elfN(loadimage)(fp, &ef, dest);
425 if (fp->f_size == 0 || fp->f_addr == 0)
428 /* save exec header as metadata */
429 file_addmetadata(fp, MODINFOMD_ELFHDR, sizeof(*ehdr), ehdr);
431 /* Load OK, return module pointer */
432 *result = (struct preloaded_file *)fp;
444 #ifdef LOADER_VERIEXEC_VECTX
445 if (!err && ef.vctx) {
448 verror = vectx_close(ef.vctx, VE_MUST, __func__);
461 * With the file (fd) open on the image, and (ehdr) containing
462 * the Elf header, load the image at (off)
465 __elfN(loadimage)(struct preloaded_file *fp, elf_file_t ef, uint64_t off)
470 Elf_Phdr *phdr, *php;
474 vm_offset_t firstaddr;
475 vm_offset_t lastaddr;
488 Elf_Addr p_start, p_end;
493 firstaddr = lastaddr = 0;
498 if (ehdr->e_type == ET_EXEC) {
500 #if defined(__i386__) || defined(__amd64__)
501 #if __ELF_WORD_SIZE == 64
502 /* x86_64 relocates after locore */
503 off = - (off & 0xffffffffff000000ull);
505 /* i386 relocates after locore */
506 off = - (off & 0xff000000u);
508 #elif defined(__powerpc__)
510 * On the purely virtual memory machines like e500, the kernel
511 * is linked against its final VA range, which is most often
512 * not available at the loader stage, but only after kernel
513 * initializes and completes its VM settings. In such cases we
514 * cannot use p_vaddr field directly to load ELF segments, but
515 * put them at some 'load-time' locations.
517 if (off & 0xf0000000u) {
518 off = -(off & 0xf0000000u);
520 * XXX the physical load address should not be
521 * hardcoded. Note that the Book-E kernel assumes that
522 * it's loaded at a 16MB boundary for now...
526 ehdr->e_entry += off;
528 printf("Converted entry 0x%jx\n", (uintmax_t)ehdr->e_entry);
530 #elif defined(__arm__) && !defined(EFI)
532 * The elf headers in arm kernels specify virtual addresses in
533 * all header fields, even the ones that should be physical
534 * addresses. We assume the entry point is in the first page,
535 * and masking the page offset will leave us with the virtual
536 * address the kernel was linked at. We subtract that from the
537 * load offset, making 'off' into the value which, when added
538 * to a virtual address in an elf header, translates it to a
539 * physical address. We do the va->pa conversion on the entry
540 * point address in the header now, so that later we can launch
541 * the kernel by just jumping to that address.
543 * When booting from UEFI the copyin and copyout functions
544 * handle adjusting the location relative to the first virtual
545 * address. Because of this there is no need to adjust the
546 * offset or entry point address as these will both be handled
549 off -= ehdr->e_entry & ~PAGE_MASK;
550 ehdr->e_entry += off;
552 printf("ehdr->e_entry 0x%jx, va<->pa off %llx\n",
553 (uintmax_t)ehdr->e_entry, off);
556 off = 0; /* other archs use direct mapped kernels */
562 __elfN(relocation_offset) = off;
564 if ((ehdr->e_phoff + ehdr->e_phnum * sizeof(*phdr)) > ef->firstlen) {
565 printf("elf" __XSTRING(__ELF_WORD_SIZE)
566 "_loadimage: program header not within first page\n");
569 phdr = (Elf_Phdr *)(ef->firstpage + ehdr->e_phoff);
571 for (i = 0; i < ehdr->e_phnum; i++) {
572 if (elf_program_header_convert(ehdr, phdr))
575 /* We want to load PT_LOAD segments only.. */
576 if (phdr[i].p_type != PT_LOAD)
580 printf("Segment: 0x%lx@0x%lx -> 0x%lx-0x%lx",
581 (long)phdr[i].p_filesz, (long)phdr[i].p_offset,
582 (long)(phdr[i].p_vaddr + off),
583 (long)(phdr[i].p_vaddr + off + phdr[i].p_memsz - 1));
585 if ((phdr[i].p_flags & PF_W) == 0) {
586 printf("text=0x%lx ", (long)phdr[i].p_filesz);
588 printf("data=0x%lx", (long)phdr[i].p_filesz);
589 if (phdr[i].p_filesz < phdr[i].p_memsz)
590 printf("+0x%lx", (long)(phdr[i].p_memsz -
596 if (ef->firstlen > phdr[i].p_offset) {
597 fpcopy = ef->firstlen - phdr[i].p_offset;
598 archsw.arch_copyin(ef->firstpage + phdr[i].p_offset,
599 phdr[i].p_vaddr + off, fpcopy);
601 if (phdr[i].p_filesz > fpcopy) {
602 if (kern_pread(VECTX_HANDLE(ef),
603 phdr[i].p_vaddr + off + fpcopy,
604 phdr[i].p_filesz - fpcopy,
605 phdr[i].p_offset + fpcopy) != 0) {
606 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
607 "_loadimage: read failed\n");
611 /* clear space from oversized segments; eg: bss */
612 if (phdr[i].p_filesz < phdr[i].p_memsz) {
614 printf(" (bss: 0x%lx-0x%lx)",
615 (long)(phdr[i].p_vaddr + off + phdr[i].p_filesz),
616 (long)(phdr[i].p_vaddr + off + phdr[i].p_memsz -1));
619 kern_bzero(phdr[i].p_vaddr + off + phdr[i].p_filesz,
620 phdr[i].p_memsz - phdr[i].p_filesz);
626 if (archsw.arch_loadseg != NULL)
627 archsw.arch_loadseg(ehdr, phdr + i, off);
629 if (firstaddr == 0 || firstaddr > (phdr[i].p_vaddr + off))
630 firstaddr = phdr[i].p_vaddr + off;
631 if (lastaddr == 0 || lastaddr <
632 (phdr[i].p_vaddr + off + phdr[i].p_memsz))
633 lastaddr = phdr[i].p_vaddr + off + phdr[i].p_memsz;
635 lastaddr = roundup(lastaddr, sizeof(long));
638 * Get the section headers. We need this for finding the .ctors
639 * section as well as for loading any symbols. Both may be hard
640 * to do if reading from a .gz file as it involves seeking. I
641 * think the rule is going to have to be that you must strip a
642 * file to remove symbols before gzipping it.
644 chunk = (size_t)ehdr->e_shnum * (size_t)ehdr->e_shentsize;
645 if (chunk == 0 || ehdr->e_shoff == 0)
647 shdr = alloc_pread(VECTX_HANDLE(ef), ehdr->e_shoff, chunk);
649 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
650 "_loadimage: failed to read section headers");
654 for (i = 0; i < ehdr->e_shnum; i++)
655 elf_section_header_convert(ehdr, &shdr[i]);
657 file_addmetadata(fp, MODINFOMD_SHDR, chunk, shdr);
660 * Read the section string table and look for the .ctors section.
661 * We need to tell the kernel where it is so that it can call the
664 chunk = shdr[ehdr->e_shstrndx].sh_size;
666 shstr = alloc_pread(VECTX_HANDLE(ef),
667 shdr[ehdr->e_shstrndx].sh_offset, chunk);
669 for (i = 0; i < ehdr->e_shnum; i++) {
670 if (strcmp(shstr + shdr[i].sh_name,
673 ctors = shdr[i].sh_addr;
674 file_addmetadata(fp, MODINFOMD_CTORS_ADDR,
675 sizeof(ctors), &ctors);
676 size = shdr[i].sh_size;
677 file_addmetadata(fp, MODINFOMD_CTORS_SIZE,
678 sizeof(size), &size);
686 * Now load any symbols.
690 for (i = 0; i < ehdr->e_shnum; i++) {
691 if (shdr[i].sh_type != SHT_SYMTAB)
693 for (j = 0; j < ehdr->e_phnum; j++) {
694 if (phdr[j].p_type != PT_LOAD)
696 if (shdr[i].sh_offset >= phdr[j].p_offset &&
697 (shdr[i].sh_offset + shdr[i].sh_size <=
698 phdr[j].p_offset + phdr[j].p_filesz)) {
699 shdr[i].sh_offset = 0;
704 if (shdr[i].sh_offset == 0 || shdr[i].sh_size == 0)
705 continue; /* alread loaded in a PT_LOAD above */
706 /* Save it for loading below */
708 symstrindex = shdr[i].sh_link;
710 if (symtabindex < 0 || symstrindex < 0)
713 /* Ok, committed to a load. */
718 for (i = symtabindex; i >= 0; i = symstrindex) {
722 switch(shdr[i].sh_type) {
723 case SHT_SYMTAB: /* Symbol table */
726 case SHT_STRTAB: /* String table */
734 size = shdr[i].sh_size;
735 #if defined(__powerpc__)
736 #if __ELF_WORD_SIZE == 64
737 size = htobe64(size);
739 size = htobe32(size);
743 archsw.arch_copyin(&size, lastaddr, sizeof(size));
744 lastaddr += sizeof(size);
747 printf("\n%s: 0x%jx@0x%jx -> 0x%jx-0x%jx", secname,
748 (uintmax_t)shdr[i].sh_size, (uintmax_t)shdr[i].sh_offset,
750 (uintmax_t)(lastaddr + shdr[i].sh_size));
752 if (i == symstrindex)
754 printf("0x%lx+0x%lx", (long)sizeof(size), (long)size);
757 if (VECTX_LSEEK(VECTX_HANDLE(ef), (off_t)shdr[i].sh_offset, SEEK_SET) == -1) {
758 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
759 "_loadimage: could not seek for symbols - skipped!");
764 result = archsw.arch_readin(VECTX_HANDLE(ef), lastaddr, shdr[i].sh_size);
765 if (result < 0 || (size_t)result != shdr[i].sh_size) {
766 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
767 "_loadimage: could not read symbols - skipped! "
768 "(%ju != %ju)", (uintmax_t)result,
769 (uintmax_t)shdr[i].sh_size);
774 /* Reset offsets relative to ssym */
775 lastaddr += shdr[i].sh_size;
776 lastaddr = roundup(lastaddr, sizeof(size));
777 if (i == symtabindex)
779 else if (i == symstrindex)
787 #if defined(__powerpc__)
788 /* On PowerPC we always need to provide BE data to the kernel */
789 #if __ELF_WORD_SIZE == 64
790 ssym = htobe64((uint64_t)ssym);
791 esym = htobe64((uint64_t)esym);
793 ssym = htobe32((uint32_t)ssym);
794 esym = htobe32((uint32_t)esym);
798 file_addmetadata(fp, MODINFOMD_SSYM, sizeof(ssym), &ssym);
799 file_addmetadata(fp, MODINFOMD_ESYM, sizeof(esym), &esym);
804 ret = lastaddr - firstaddr;
805 fp->f_addr = firstaddr;
808 for (i = 0; i < ehdr->e_phnum; i++) {
809 if (phdr[i].p_type == PT_DYNAMIC) {
812 file_addmetadata(fp, MODINFOMD_DYNAMIC, sizeof(adp),
818 if (php == NULL) /* this is bad, we cannot get to symbols or _DYNAMIC */
821 ndp = php->p_filesz / sizeof(Elf_Dyn);
824 dp = malloc(php->p_filesz);
827 archsw.arch_copyout(php->p_vaddr + off, dp, php->p_filesz);
830 for (i = 0; i < ndp; i++) {
831 if (dp[i].d_tag == 0)
833 switch (dp[i].d_tag) {
836 (Elf_Hashelt*)(uintptr_t)(dp[i].d_un.d_ptr + off);
840 (char *)(uintptr_t)(dp[i].d_un.d_ptr + off);
843 ef->strsz = dp[i].d_un.d_val;
847 (Elf_Sym *)(uintptr_t)(dp[i].d_un.d_ptr + off);
851 (Elf_Rel *)(uintptr_t)(dp[i].d_un.d_ptr + off);
854 ef->relsz = dp[i].d_un.d_val;
858 (Elf_Rela *)(uintptr_t)(dp[i].d_un.d_ptr + off);
861 ef->relasz = dp[i].d_un.d_val;
867 if (ef->hashtab == NULL || ef->symtab == NULL ||
868 ef->strtab == NULL || ef->strsz == 0)
870 COPYOUT(ef->hashtab, &ef->nbuckets, sizeof(ef->nbuckets));
871 COPYOUT(ef->hashtab + 1, &ef->nchains, sizeof(ef->nchains));
872 ef->buckets = ef->hashtab + 2;
873 ef->chains = ef->buckets + ef->nbuckets;
875 if (__elfN(lookup_symbol)(fp, ef, "__start_set_modmetadata_set",
878 p_start = sym.st_value + ef->off;
879 if (__elfN(lookup_symbol)(fp, ef, "__stop_set_modmetadata_set",
882 p_end = sym.st_value + ef->off;
884 if (__elfN(parse_modmetadata)(fp, ef, p_start, p_end) == 0)
887 if (ef->kernel) /* kernel must not depend on anything */
898 static char invalid_name[] = "bad";
901 fake_modname(const char *name)
907 sp = strrchr(name, '/');
913 ep = strrchr(sp, '.');
915 ep = sp + strlen(sp);
919 ep = invalid_name + sizeof(invalid_name) - 1;
923 fp = malloc(len + 1);
931 #if (defined(__i386__) || defined(__powerpc__)) && __ELF_WORD_SIZE == 64
932 struct mod_metadata64 {
933 int md_version; /* structure version MDTV_* */
934 int md_type; /* type of entry MDT_* */
935 uint64_t md_data; /* specific data */
936 uint64_t md_cval; /* common string label */
939 #if defined(__amd64__) && __ELF_WORD_SIZE == 32
940 struct mod_metadata32 {
941 int md_version; /* structure version MDTV_* */
942 int md_type; /* type of entry MDT_* */
943 uint32_t md_data; /* specific data */
944 uint32_t md_cval; /* common string label */
949 __elfN(load_modmetadata)(struct preloaded_file *fp, uint64_t dest)
953 Elf_Shdr *sh_meta, *shdr = NULL;
954 Elf_Shdr *sh_data[2];
955 char *shstrtab = NULL;
957 Elf_Addr p_start, p_end;
959 bzero(&ef, sizeof(struct elf_file));
962 err = __elfN(load_elf_header)(fp->f_name, &ef);
966 if (ef.kernel == 1 || ef.ehdr->e_type == ET_EXEC) {
968 } else if (ef.ehdr->e_type != ET_DYN) {
973 size = (size_t)ef.ehdr->e_shnum * (size_t)ef.ehdr->e_shentsize;
974 shdr = alloc_pread(VECTX_HANDLE(&ef), ef.ehdr->e_shoff, size);
981 shstrtab = alloc_pread(VECTX_HANDLE(&ef), shdr[ef.ehdr->e_shstrndx].sh_offset,
982 shdr[ef.ehdr->e_shstrndx].sh_size);
983 if (shstrtab == NULL) {
984 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
985 "load_modmetadata: unable to load shstrtab\n");
990 /* Find set_modmetadata_set and data sections. */
991 sh_data[0] = sh_data[1] = sh_meta = NULL;
992 for (i = 0, j = 0; i < ef.ehdr->e_shnum; i++) {
993 if (strcmp(&shstrtab[shdr[i].sh_name],
994 "set_modmetadata_set") == 0) {
997 if ((strcmp(&shstrtab[shdr[i].sh_name], ".data") == 0) ||
998 (strcmp(&shstrtab[shdr[i].sh_name], ".rodata") == 0)) {
999 sh_data[j++] = &shdr[i];
1002 if (sh_meta == NULL || sh_data[0] == NULL || sh_data[1] == NULL) {
1003 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
1004 "load_modmetadata: unable to find set_modmetadata_set or data sections\n");
1009 /* Load set_modmetadata_set into memory */
1010 err = kern_pread(VECTX_HANDLE(&ef), dest, sh_meta->sh_size, sh_meta->sh_offset);
1012 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
1013 "load_modmetadata: unable to load set_modmetadata_set: %d\n", err);
1017 p_end = dest + sh_meta->sh_size;
1018 dest += sh_meta->sh_size;
1020 /* Load data sections into memory. */
1021 err = kern_pread(VECTX_HANDLE(&ef), dest, sh_data[0]->sh_size,
1022 sh_data[0]->sh_offset);
1024 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
1025 "load_modmetadata: unable to load data: %d\n", err);
1030 * We have to increment the dest, so that the offset is the same into
1031 * both the .rodata and .data sections.
1033 ef.off = -(sh_data[0]->sh_addr - dest);
1034 dest += (sh_data[1]->sh_addr - sh_data[0]->sh_addr);
1036 err = kern_pread(VECTX_HANDLE(&ef), dest, sh_data[1]->sh_size,
1037 sh_data[1]->sh_offset);
1039 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
1040 "load_modmetadata: unable to load data: %d\n", err);
1044 err = __elfN(parse_modmetadata)(fp, &ef, p_start, p_end);
1046 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
1047 "load_modmetadata: unable to parse metadata: %d\n", err);
1052 if (shstrtab != NULL)
1056 if (ef.firstpage != NULL)
1059 #ifdef LOADER_VERIEXEC_VECTX
1060 if (!err && ef.vctx) {
1063 verror = vectx_close(ef.vctx, VE_MUST, __func__);
1076 __elfN(parse_modmetadata)(struct preloaded_file *fp, elf_file_t ef,
1077 Elf_Addr p_start, Elf_Addr p_end)
1079 struct mod_metadata md;
1080 #if (defined(__i386__) || defined(__powerpc__)) && __ELF_WORD_SIZE == 64
1081 struct mod_metadata64 md64;
1082 #elif defined(__amd64__) && __ELF_WORD_SIZE == 32
1083 struct mod_metadata32 md32;
1085 struct mod_depend *mdepend;
1086 struct mod_version mver;
1088 int error, modcnt, minfolen;
1094 COPYOUT(p, &v, sizeof(v));
1095 error = __elfN(reloc_ptr)(fp, ef, p, &v, sizeof(v));
1096 if (error == EOPNOTSUPP)
1098 else if (error != 0)
1100 #if (defined(__i386__) || defined(__powerpc__)) && __ELF_WORD_SIZE == 64
1101 COPYOUT(v, &md64, sizeof(md64));
1102 error = __elfN(reloc_ptr)(fp, ef, v, &md64, sizeof(md64));
1103 if (error == EOPNOTSUPP) {
1104 md64.md_cval += ef->off;
1105 md64.md_data += ef->off;
1106 } else if (error != 0)
1108 md.md_version = md64.md_version;
1109 md.md_type = md64.md_type;
1110 md.md_cval = (const char *)(uintptr_t)md64.md_cval;
1111 md.md_data = (void *)(uintptr_t)md64.md_data;
1112 #elif defined(__amd64__) && __ELF_WORD_SIZE == 32
1113 COPYOUT(v, &md32, sizeof(md32));
1114 error = __elfN(reloc_ptr)(fp, ef, v, &md32, sizeof(md32));
1115 if (error == EOPNOTSUPP) {
1116 md32.md_cval += ef->off;
1117 md32.md_data += ef->off;
1118 } else if (error != 0)
1120 md.md_version = md32.md_version;
1121 md.md_type = md32.md_type;
1122 md.md_cval = (const char *)(uintptr_t)md32.md_cval;
1123 md.md_data = (void *)(uintptr_t)md32.md_data;
1125 COPYOUT(v, &md, sizeof(md));
1126 error = __elfN(reloc_ptr)(fp, ef, v, &md, sizeof(md));
1127 if (error == EOPNOTSUPP) {
1128 md.md_cval += ef->off;
1129 md.md_data = (void *)((uintptr_t)md.md_data +
1130 (uintptr_t)ef->off);
1131 } else if (error != 0)
1134 p += sizeof(Elf_Addr);
1135 switch(md.md_type) {
1137 if (ef->kernel) /* kernel must not depend on anything */
1139 s = strdupout((vm_offset_t)md.md_cval);
1140 minfolen = sizeof(*mdepend) + strlen(s) + 1;
1141 mdepend = malloc(minfolen);
1142 if (mdepend == NULL)
1144 COPYOUT((vm_offset_t)md.md_data, mdepend,
1146 strcpy((char*)(mdepend + 1), s);
1148 file_addmetadata(fp, MODINFOMD_DEPLIST, minfolen,
1153 s = strdupout((vm_offset_t)md.md_cval);
1154 COPYOUT((vm_offset_t)md.md_data, &mver, sizeof(mver));
1155 file_addmodule(fp, s, mver.mv_version, NULL);
1162 s = fake_modname(fp->f_name);
1163 file_addmodule(fp, s, 1, NULL);
1169 static unsigned long
1170 elf_hash(const char *name)
1172 const unsigned char *p = (const unsigned char *) name;
1173 unsigned long h = 0;
1176 while (*p != '\0') {
1177 h = (h << 4) + *p++;
1178 if ((g = h & 0xf0000000) != 0)
1185 static const char __elfN(bad_symtable)[] = "elf" __XSTRING(__ELF_WORD_SIZE)
1186 "_lookup_symbol: corrupt symbol table\n";
1188 __elfN(lookup_symbol)(struct preloaded_file *fp, elf_file_t ef,
1189 const char* name, Elf_Sym *symp)
1196 hash = elf_hash(name);
1197 COPYOUT(&ef->buckets[hash % ef->nbuckets], &symnum, sizeof(symnum));
1199 while (symnum != STN_UNDEF) {
1200 if (symnum >= ef->nchains) {
1201 printf(__elfN(bad_symtable));
1205 COPYOUT(ef->symtab + symnum, &sym, sizeof(sym));
1206 if (sym.st_name == 0) {
1207 printf(__elfN(bad_symtable));
1211 strp = strdupout((vm_offset_t)(ef->strtab + sym.st_name));
1212 if (strcmp(name, strp) == 0) {
1214 if (sym.st_shndx != SHN_UNDEF ||
1215 (sym.st_value != 0 &&
1216 ELF_ST_TYPE(sym.st_info) == STT_FUNC)) {
1223 COPYOUT(&ef->chains[symnum], &symnum, sizeof(symnum));
1229 * Apply any intra-module relocations to the value. p is the load address
1230 * of the value and val/len is the value to be modified. This does NOT modify
1231 * the image in-place, because this is done by kern_linker later on.
1233 * Returns EOPNOTSUPP if no relocation method is supplied.
1236 __elfN(reloc_ptr)(struct preloaded_file *mp, elf_file_t ef,
1237 Elf_Addr p, void *val, size_t len)
1245 * The kernel is already relocated, but we still want to apply
1246 * offset adjustments.
1249 return (EOPNOTSUPP);
1251 for (n = 0; n < ef->relsz / sizeof(r); n++) {
1252 COPYOUT(ef->rel + n, &r, sizeof(r));
1254 error = __elfN(reloc)(ef, __elfN(symaddr), &r, ELF_RELOC_REL,
1255 ef->off, p, val, len);
1259 for (n = 0; n < ef->relasz / sizeof(a); n++) {
1260 COPYOUT(ef->rela + n, &a, sizeof(a));
1262 error = __elfN(reloc)(ef, __elfN(symaddr), &a, ELF_RELOC_RELA,
1263 ef->off, p, val, len);
1272 __elfN(symaddr)(struct elf_file *ef, Elf_Size symidx)
1275 /* Symbol lookup by index not required here. */