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)(elf_file_t ef, const char* name,
88 Elf_Sym *sym, unsigned char type);
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
210 is_kernphys_relocatable(elf_file_t ef)
214 return (__elfN(lookup_symbol)(ef, "kernphys", &sym, STT_OBJECT) == 0);
220 is_tg_kernel_support(struct preloaded_file *fp, elf_file_t ef)
223 Elf_Addr p_start, p_end, v, p;
227 if (__elfN(lookup_symbol)(ef, "__start_set_vt_drv_set", &sym, STT_NOTYPE) != 0)
229 p_start = sym.st_value + ef->off;
230 if (__elfN(lookup_symbol)(ef, "__stop_set_vt_drv_set", &sym, STT_NOTYPE) != 0)
232 p_end = sym.st_value + ef->off;
235 * Walk through vt_drv_set, each vt driver structure starts with
236 * static 16 chars for driver name. If we have "vbefb", return true.
238 for (p = p_start; p < p_end; p += sizeof(Elf_Addr)) {
239 COPYOUT(p, &v, sizeof(v));
241 error = __elfN(reloc_ptr)(fp, ef, p, &v, sizeof(v));
242 if (error == EOPNOTSUPP)
246 COPYOUT(v, &vd_name, sizeof(vd_name));
247 if (strncmp(vd_name, "vbefb", sizeof(vd_name)) == 0)
256 __elfN(load_elf_header)(char *filename, elf_file_t ef)
263 * Open the image, read and validate the ELF header
265 if (filename == NULL) /* can't handle nameless */
267 if ((ef->fd = open(filename, O_RDONLY)) == -1)
269 ef->firstpage = malloc(PAGE_SIZE);
270 if (ef->firstpage == NULL) {
275 #ifdef LOADER_VERIEXEC_VECTX
279 ef->vctx = vectx_open(ef->fd, filename, 0L, NULL, &verror, __func__);
281 printf("Unverified %s: %s\n", filename, ve_error_get());
288 bytes_read = VECTX_READ(VECTX_HANDLE(ef), ef->firstpage, PAGE_SIZE);
289 ef->firstlen = (size_t)bytes_read;
290 if (bytes_read < 0 || ef->firstlen <= sizeof(Elf_Ehdr)) {
291 err = EFTYPE; /* could be EIO, but may be small file */
294 ehdr = ef->ehdr = (Elf_Ehdr *)ef->firstpage;
297 if (!IS_ELF(*ehdr)) {
302 if (ehdr->e_ident[EI_CLASS] != ELF_TARG_CLASS || /* Layout ? */
303 ehdr->e_ident[EI_DATA] != ELF_TARG_DATA ||
304 ehdr->e_ident[EI_VERSION] != EV_CURRENT) /* Version ? */ {
309 err = elf_header_convert(ehdr);
313 if (ehdr->e_version != EV_CURRENT || ehdr->e_machine != ELF_TARG_MACH) {
319 #if defined(LOADER_VERIEXEC) && !defined(LOADER_VERIEXEC_VECTX)
320 if (verify_file(ef->fd, filename, bytes_read, VE_MUST, __func__) < 0) {
328 if (ef->firstpage != NULL) {
330 ef->firstpage = NULL;
333 #ifdef LOADER_VERIEXEC_VECTX
343 * Attempt to load the file (file) as an ELF module. It will be stored at
344 * (dest), and a pointer to a module structure describing the loaded object
345 * will be saved in (result).
348 __elfN(loadfile)(char *filename, uint64_t dest, struct preloaded_file **result)
350 return (__elfN(loadfile_raw)(filename, dest, result, 0));
354 __elfN(loadfile_raw)(char *filename, uint64_t dest,
355 struct preloaded_file **result, int multiboot)
357 struct preloaded_file *fp, *kfp;
363 bzero(&ef, sizeof(struct elf_file));
366 err = __elfN(load_elf_header)(filename, &ef);
373 * Check to see what sort of module we are.
375 kfp = file_findfile(NULL, __elfN(kerneltype));
378 * Kernels can be ET_DYN, so just assume the first loaded object is the
379 * kernel. This assumption will be checked later.
384 if (ef.kernel || ehdr->e_type == ET_EXEC) {
385 /* Looks like a kernel */
387 printf("elf" __XSTRING(__ELF_WORD_SIZE)
388 "_loadfile: kernel already loaded\n");
393 * Calculate destination address based on kernel entrypoint.
395 * For ARM, the destination address is independent of any values
396 * in the elf header (an ARM kernel can be loaded at any 2MB
397 * boundary), so we leave dest set to the value calculated by
398 * archsw.arch_loadaddr() and passed in to this function.
401 if (ehdr->e_type == ET_EXEC)
402 dest = (ehdr->e_entry & ~PAGE_MASK);
404 if ((ehdr->e_entry & ~PAGE_MASK) == 0) {
405 printf("elf" __XSTRING(__ELF_WORD_SIZE)
406 "_loadfile: not a kernel (maybe static binary?)\n");
412 } else if (ehdr->e_type == ET_DYN) {
413 /* Looks like a kld module */
414 if (multiboot != 0) {
415 printf("elf" __XSTRING(__ELF_WORD_SIZE)
416 "_loadfile: can't load module as multiboot\n");
421 printf("elf" __XSTRING(__ELF_WORD_SIZE)
422 "_loadfile: can't load module before kernel\n");
426 if (strcmp(__elfN(kerneltype), kfp->f_type)) {
427 printf("elf" __XSTRING(__ELF_WORD_SIZE)
428 "_loadfile: can't load module with kernel type '%s'\n",
433 /* Looks OK, got ahead */
441 if (archsw.arch_loadaddr != NULL)
442 dest = archsw.arch_loadaddr(LOAD_ELF, ehdr, dest);
444 dest = roundup(dest, PAGE_SIZE);
447 * Ok, we think we should handle this.
451 printf("elf" __XSTRING(__ELF_WORD_SIZE)
452 "_loadfile: cannot allocate module info\n");
456 if (ef.kernel == 1 && multiboot == 0)
457 setenv("kernelname", filename, 1);
458 fp->f_name = strdup(filename);
460 fp->f_type = strdup(ef.kernel ?
461 __elfN(kerneltype) : __elfN(moduletype));
463 fp->f_type = strdup("elf multiboot kernel");
465 if (module_verbose >= MODULE_VERBOSE_FULL) {
467 printf("%s entry at 0x%jx\n", filename,
468 (uintmax_t)ehdr->e_entry);
469 } else if (module_verbose > MODULE_VERBOSE_SILENT)
470 printf("%s ", filename);
472 fp->f_size = __elfN(loadimage)(fp, &ef, dest);
473 if (fp->f_size == 0 || fp->f_addr == 0)
476 /* save exec header as metadata */
477 file_addmetadata(fp, MODINFOMD_ELFHDR, sizeof(*ehdr), ehdr);
479 /* Load OK, return module pointer */
480 *result = (struct preloaded_file *)fp;
483 fp->f_kernphys_relocatable = multiboot || is_kernphys_relocatable(&ef);
486 fp->f_tg_kernel_support = is_tg_kernel_support(fp, &ef);
498 #ifdef LOADER_VERIEXEC_VECTX
499 if (!err && ef.vctx) {
502 verror = vectx_close(ef.vctx, VE_MUST, __func__);
515 * With the file (fd) open on the image, and (ehdr) containing
516 * the Elf header, load the image at (off)
519 __elfN(loadimage)(struct preloaded_file *fp, elf_file_t ef, uint64_t off)
524 Elf_Phdr *phdr, *php;
528 vm_offset_t firstaddr;
529 vm_offset_t lastaddr;
542 Elf_Addr p_start, p_end;
547 firstaddr = lastaddr = 0;
552 if (ehdr->e_type == ET_EXEC) {
554 #if defined(__i386__) || defined(__amd64__)
555 #if __ELF_WORD_SIZE == 64
556 /* x86_64 relocates after locore */
557 off = - (off & 0xffffffffff000000ull);
559 /* i386 relocates after locore */
560 off = - (off & 0xff000000u);
562 #elif defined(__powerpc__)
564 * On the purely virtual memory machines like e500, the kernel
565 * is linked against its final VA range, which is most often
566 * not available at the loader stage, but only after kernel
567 * initializes and completes its VM settings. In such cases we
568 * cannot use p_vaddr field directly to load ELF segments, but
569 * put them at some 'load-time' locations.
571 if (off & 0xf0000000u) {
572 off = -(off & 0xf0000000u);
574 * XXX the physical load address should not be
575 * hardcoded. Note that the Book-E kernel assumes that
576 * it's loaded at a 16MB boundary for now...
580 ehdr->e_entry += off;
581 if (module_verbose >= MODULE_VERBOSE_FULL)
582 printf("Converted entry 0x%jx\n",
583 (uintmax_t)ehdr->e_entry);
585 #elif defined(__arm__) && !defined(EFI)
587 * The elf headers in arm kernels specify virtual addresses in
588 * all header fields, even the ones that should be physical
589 * addresses. We assume the entry point is in the first page,
590 * and masking the page offset will leave us with the virtual
591 * address the kernel was linked at. We subtract that from the
592 * load offset, making 'off' into the value which, when added
593 * to a virtual address in an elf header, translates it to a
594 * physical address. We do the va->pa conversion on the entry
595 * point address in the header now, so that later we can launch
596 * the kernel by just jumping to that address.
598 * When booting from UEFI the copyin and copyout functions
599 * handle adjusting the location relative to the first virtual
600 * address. Because of this there is no need to adjust the
601 * offset or entry point address as these will both be handled
604 off -= ehdr->e_entry & ~PAGE_MASK;
605 ehdr->e_entry += off;
606 if (module_verbose >= MODULE_VERBOSE_FULL)
607 printf("ehdr->e_entry 0x%jx, va<->pa off %llx\n",
608 (uintmax_t)ehdr->e_entry, off);
610 off = 0; /* other archs use direct mapped kernels */
616 __elfN(relocation_offset) = off;
618 if ((ehdr->e_phoff + ehdr->e_phnum * sizeof(*phdr)) > ef->firstlen) {
619 printf("elf" __XSTRING(__ELF_WORD_SIZE)
620 "_loadimage: program header not within first page\n");
623 phdr = (Elf_Phdr *)(ef->firstpage + ehdr->e_phoff);
625 for (i = 0; i < ehdr->e_phnum; i++) {
626 if (elf_program_header_convert(ehdr, phdr))
629 /* We want to load PT_LOAD segments only.. */
630 if (phdr[i].p_type != PT_LOAD)
633 if (module_verbose >= MODULE_VERBOSE_FULL) {
634 printf("Segment: 0x%lx@0x%lx -> 0x%lx-0x%lx",
635 (long)phdr[i].p_filesz, (long)phdr[i].p_offset,
636 (long)(phdr[i].p_vaddr + off),
637 (long)(phdr[i].p_vaddr + off + phdr[i].p_memsz - 1));
638 } else if (module_verbose > MODULE_VERBOSE_SILENT) {
639 if ((phdr[i].p_flags & PF_W) == 0) {
640 printf("text=0x%lx ", (long)phdr[i].p_filesz);
642 printf("data=0x%lx", (long)phdr[i].p_filesz);
643 if (phdr[i].p_filesz < phdr[i].p_memsz)
644 printf("+0x%lx", (long)(phdr[i].p_memsz -
650 if (ef->firstlen > phdr[i].p_offset) {
651 fpcopy = ef->firstlen - phdr[i].p_offset;
652 archsw.arch_copyin(ef->firstpage + phdr[i].p_offset,
653 phdr[i].p_vaddr + off, fpcopy);
655 if (phdr[i].p_filesz > fpcopy) {
656 if (kern_pread(VECTX_HANDLE(ef),
657 phdr[i].p_vaddr + off + fpcopy,
658 phdr[i].p_filesz - fpcopy,
659 phdr[i].p_offset + fpcopy) != 0) {
660 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
661 "_loadimage: read failed\n");
665 /* clear space from oversized segments; eg: bss */
666 if (phdr[i].p_filesz < phdr[i].p_memsz) {
667 if (module_verbose >= MODULE_VERBOSE_FULL) {
668 printf(" (bss: 0x%lx-0x%lx)",
669 (long)(phdr[i].p_vaddr + off + phdr[i].p_filesz),
670 (long)(phdr[i].p_vaddr + off + phdr[i].p_memsz -1));
672 kern_bzero(phdr[i].p_vaddr + off + phdr[i].p_filesz,
673 phdr[i].p_memsz - phdr[i].p_filesz);
675 if (module_verbose >= MODULE_VERBOSE_FULL)
678 if (archsw.arch_loadseg != NULL)
679 archsw.arch_loadseg(ehdr, phdr + i, off);
681 if (firstaddr == 0 || firstaddr > (phdr[i].p_vaddr + off))
682 firstaddr = phdr[i].p_vaddr + off;
683 if (lastaddr == 0 || lastaddr <
684 (phdr[i].p_vaddr + off + phdr[i].p_memsz))
685 lastaddr = phdr[i].p_vaddr + off + phdr[i].p_memsz;
687 lastaddr = roundup(lastaddr, sizeof(long));
690 * Get the section headers. We need this for finding the .ctors
691 * section as well as for loading any symbols. Both may be hard
692 * to do if reading from a .gz file as it involves seeking. I
693 * think the rule is going to have to be that you must strip a
694 * file to remove symbols before gzipping it.
696 chunk = (size_t)ehdr->e_shnum * (size_t)ehdr->e_shentsize;
697 if (chunk == 0 || ehdr->e_shoff == 0)
699 shdr = alloc_pread(VECTX_HANDLE(ef), ehdr->e_shoff, chunk);
701 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
702 "_loadimage: failed to read section headers");
706 for (i = 0; i < ehdr->e_shnum; i++)
707 elf_section_header_convert(ehdr, &shdr[i]);
709 file_addmetadata(fp, MODINFOMD_SHDR, chunk, shdr);
712 * Read the section string table and look for the .ctors section.
713 * We need to tell the kernel where it is so that it can call the
716 chunk = shdr[ehdr->e_shstrndx].sh_size;
718 shstr = alloc_pread(VECTX_HANDLE(ef),
719 shdr[ehdr->e_shstrndx].sh_offset, chunk);
721 for (i = 0; i < ehdr->e_shnum; i++) {
722 if (strcmp(shstr + shdr[i].sh_name,
725 ctors = shdr[i].sh_addr;
726 file_addmetadata(fp, MODINFOMD_CTORS_ADDR,
727 sizeof(ctors), &ctors);
728 size = shdr[i].sh_size;
729 file_addmetadata(fp, MODINFOMD_CTORS_SIZE,
730 sizeof(size), &size);
738 * Now load any symbols.
742 for (i = 0; i < ehdr->e_shnum; i++) {
743 if (shdr[i].sh_type != SHT_SYMTAB)
745 for (j = 0; j < ehdr->e_phnum; j++) {
746 if (phdr[j].p_type != PT_LOAD)
748 if (shdr[i].sh_offset >= phdr[j].p_offset &&
749 (shdr[i].sh_offset + shdr[i].sh_size <=
750 phdr[j].p_offset + phdr[j].p_filesz)) {
751 shdr[i].sh_offset = 0;
756 if (shdr[i].sh_offset == 0 || shdr[i].sh_size == 0)
757 continue; /* alread loaded in a PT_LOAD above */
758 /* Save it for loading below */
760 symstrindex = shdr[i].sh_link;
762 if (symtabindex < 0 || symstrindex < 0)
765 /* Ok, committed to a load. */
766 if (module_verbose >= MODULE_VERBOSE_FULL)
769 for (i = symtabindex; i >= 0; i = symstrindex) {
772 switch(shdr[i].sh_type) {
773 case SHT_SYMTAB: /* Symbol table */
776 case SHT_STRTAB: /* String table */
783 size = shdr[i].sh_size;
785 archsw.arch_copyin(&size, lastaddr, sizeof(size));
786 lastaddr += sizeof(size);
788 if (module_verbose >= MODULE_VERBOSE_FULL) {
789 printf("\n%s: 0x%jx@0x%jx -> 0x%jx-0x%jx", secname,
790 (uintmax_t)shdr[i].sh_size, (uintmax_t)shdr[i].sh_offset,
792 (uintmax_t)(lastaddr + shdr[i].sh_size));
793 } else if (module_verbose > MODULE_VERBOSE_SILENT) {
794 if (i == symstrindex)
796 printf("0x%lx+0x%lx", (long)sizeof(size), (long)size);
798 if (VECTX_LSEEK(VECTX_HANDLE(ef), (off_t)shdr[i].sh_offset, SEEK_SET) == -1) {
799 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
800 "_loadimage: could not seek for symbols - skipped!");
805 result = archsw.arch_readin(VECTX_HANDLE(ef), lastaddr, shdr[i].sh_size);
806 if (result < 0 || (size_t)result != shdr[i].sh_size) {
807 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
808 "_loadimage: could not read symbols - skipped! "
809 "(%ju != %ju)", (uintmax_t)result,
810 (uintmax_t)shdr[i].sh_size);
815 /* Reset offsets relative to ssym */
816 lastaddr += shdr[i].sh_size;
817 lastaddr = roundup(lastaddr, sizeof(size));
818 if (i == symtabindex)
820 else if (i == symstrindex)
824 if (module_verbose >= MODULE_VERBOSE_FULL)
827 file_addmetadata(fp, MODINFOMD_SSYM, sizeof(ssym), &ssym);
828 file_addmetadata(fp, MODINFOMD_ESYM, sizeof(esym), &esym);
831 if (module_verbose > MODULE_VERBOSE_SILENT)
834 ret = lastaddr - firstaddr;
835 fp->f_addr = firstaddr;
838 for (i = 0; i < ehdr->e_phnum; i++) {
839 if (phdr[i].p_type == PT_DYNAMIC) {
842 file_addmetadata(fp, MODINFOMD_DYNAMIC, sizeof(adp),
848 if (php == NULL) /* this is bad, we cannot get to symbols or _DYNAMIC */
851 ndp = php->p_filesz / sizeof(Elf_Dyn);
854 dp = malloc(php->p_filesz);
857 archsw.arch_copyout(php->p_vaddr + off, dp, php->p_filesz);
860 for (i = 0; i < ndp; i++) {
861 if (dp[i].d_tag == 0)
863 switch (dp[i].d_tag) {
866 (Elf_Hashelt*)(uintptr_t)(dp[i].d_un.d_ptr + off);
870 (char *)(uintptr_t)(dp[i].d_un.d_ptr + off);
873 ef->strsz = dp[i].d_un.d_val;
877 (Elf_Sym *)(uintptr_t)(dp[i].d_un.d_ptr + off);
881 (Elf_Rel *)(uintptr_t)(dp[i].d_un.d_ptr + off);
884 ef->relsz = dp[i].d_un.d_val;
888 (Elf_Rela *)(uintptr_t)(dp[i].d_un.d_ptr + off);
891 ef->relasz = dp[i].d_un.d_val;
897 if (ef->hashtab == NULL || ef->symtab == NULL ||
898 ef->strtab == NULL || ef->strsz == 0)
900 COPYOUT(ef->hashtab, &ef->nbuckets, sizeof(ef->nbuckets));
901 COPYOUT(ef->hashtab + 1, &ef->nchains, sizeof(ef->nchains));
902 ef->buckets = ef->hashtab + 2;
903 ef->chains = ef->buckets + ef->nbuckets;
905 if (__elfN(lookup_symbol)(ef, "__start_set_modmetadata_set", &sym,
908 p_start = sym.st_value + ef->off;
909 if (__elfN(lookup_symbol)(ef, "__stop_set_modmetadata_set", &sym,
912 p_end = sym.st_value + ef->off;
914 if (__elfN(parse_modmetadata)(fp, ef, p_start, p_end) == 0)
917 if (ef->kernel) /* kernel must not depend on anything */
928 static char invalid_name[] = "bad";
931 fake_modname(const char *name)
937 sp = strrchr(name, '/');
943 ep = strrchr(sp, '.');
945 ep = sp + strlen(sp);
949 ep = invalid_name + sizeof(invalid_name) - 1;
953 fp = malloc(len + 1);
961 #if (defined(__i386__) || defined(__powerpc__)) && __ELF_WORD_SIZE == 64
962 struct mod_metadata64 {
963 int md_version; /* structure version MDTV_* */
964 int md_type; /* type of entry MDT_* */
965 uint64_t md_data; /* specific data */
966 uint64_t md_cval; /* common string label */
969 #if defined(__amd64__) && __ELF_WORD_SIZE == 32
970 struct mod_metadata32 {
971 int md_version; /* structure version MDTV_* */
972 int md_type; /* type of entry MDT_* */
973 uint32_t md_data; /* specific data */
974 uint32_t md_cval; /* common string label */
979 __elfN(load_modmetadata)(struct preloaded_file *fp, uint64_t dest)
983 Elf_Shdr *sh_meta, *shdr = NULL;
984 Elf_Shdr *sh_data[2];
985 char *shstrtab = NULL;
987 Elf_Addr p_start, p_end;
989 bzero(&ef, sizeof(struct elf_file));
992 err = __elfN(load_elf_header)(fp->f_name, &ef);
996 if (ef.kernel == 1 || ef.ehdr->e_type == ET_EXEC) {
998 } else if (ef.ehdr->e_type != ET_DYN) {
1003 size = (size_t)ef.ehdr->e_shnum * (size_t)ef.ehdr->e_shentsize;
1004 shdr = alloc_pread(VECTX_HANDLE(&ef), ef.ehdr->e_shoff, size);
1010 /* Load shstrtab. */
1011 shstrtab = alloc_pread(VECTX_HANDLE(&ef), shdr[ef.ehdr->e_shstrndx].sh_offset,
1012 shdr[ef.ehdr->e_shstrndx].sh_size);
1013 if (shstrtab == NULL) {
1014 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
1015 "load_modmetadata: unable to load shstrtab\n");
1020 /* Find set_modmetadata_set and data sections. */
1021 sh_data[0] = sh_data[1] = sh_meta = NULL;
1022 for (i = 0, j = 0; i < ef.ehdr->e_shnum; i++) {
1023 if (strcmp(&shstrtab[shdr[i].sh_name],
1024 "set_modmetadata_set") == 0) {
1027 if ((strcmp(&shstrtab[shdr[i].sh_name], ".data") == 0) ||
1028 (strcmp(&shstrtab[shdr[i].sh_name], ".rodata") == 0)) {
1029 sh_data[j++] = &shdr[i];
1032 if (sh_meta == NULL || sh_data[0] == NULL || sh_data[1] == NULL) {
1033 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
1034 "load_modmetadata: unable to find set_modmetadata_set or data sections\n");
1039 /* Load set_modmetadata_set into memory */
1040 err = kern_pread(VECTX_HANDLE(&ef), dest, sh_meta->sh_size, sh_meta->sh_offset);
1042 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
1043 "load_modmetadata: unable to load set_modmetadata_set: %d\n", err);
1047 p_end = dest + sh_meta->sh_size;
1048 dest += sh_meta->sh_size;
1050 /* Load data sections into memory. */
1051 err = kern_pread(VECTX_HANDLE(&ef), dest, sh_data[0]->sh_size,
1052 sh_data[0]->sh_offset);
1054 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
1055 "load_modmetadata: unable to load data: %d\n", err);
1060 * We have to increment the dest, so that the offset is the same into
1061 * both the .rodata and .data sections.
1063 ef.off = -(sh_data[0]->sh_addr - dest);
1064 dest += (sh_data[1]->sh_addr - sh_data[0]->sh_addr);
1066 err = kern_pread(VECTX_HANDLE(&ef), dest, sh_data[1]->sh_size,
1067 sh_data[1]->sh_offset);
1069 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
1070 "load_modmetadata: unable to load data: %d\n", err);
1074 err = __elfN(parse_modmetadata)(fp, &ef, p_start, p_end);
1076 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
1077 "load_modmetadata: unable to parse metadata: %d\n", err);
1082 if (shstrtab != NULL)
1086 if (ef.firstpage != NULL)
1089 #ifdef LOADER_VERIEXEC_VECTX
1090 if (!err && ef.vctx) {
1093 verror = vectx_close(ef.vctx, VE_MUST, __func__);
1106 __elfN(parse_modmetadata)(struct preloaded_file *fp, elf_file_t ef,
1107 Elf_Addr p_start, Elf_Addr p_end)
1109 struct mod_metadata md;
1110 #if (defined(__i386__) || defined(__powerpc__)) && __ELF_WORD_SIZE == 64
1111 struct mod_metadata64 md64;
1112 #elif defined(__amd64__) && __ELF_WORD_SIZE == 32
1113 struct mod_metadata32 md32;
1115 struct mod_depend *mdepend;
1116 struct mod_version mver;
1118 int error, modcnt, minfolen;
1124 COPYOUT(p, &v, sizeof(v));
1125 error = __elfN(reloc_ptr)(fp, ef, p, &v, sizeof(v));
1126 if (error == EOPNOTSUPP)
1128 else if (error != 0)
1130 #if (defined(__i386__) || defined(__powerpc__)) && __ELF_WORD_SIZE == 64
1131 COPYOUT(v, &md64, sizeof(md64));
1132 error = __elfN(reloc_ptr)(fp, ef, v, &md64, sizeof(md64));
1133 if (error == EOPNOTSUPP) {
1134 md64.md_cval += ef->off;
1135 md64.md_data += ef->off;
1136 } else if (error != 0)
1138 md.md_version = md64.md_version;
1139 md.md_type = md64.md_type;
1140 md.md_cval = (const char *)(uintptr_t)md64.md_cval;
1141 md.md_data = (void *)(uintptr_t)md64.md_data;
1142 #elif defined(__amd64__) && __ELF_WORD_SIZE == 32
1143 COPYOUT(v, &md32, sizeof(md32));
1144 error = __elfN(reloc_ptr)(fp, ef, v, &md32, sizeof(md32));
1145 if (error == EOPNOTSUPP) {
1146 md32.md_cval += ef->off;
1147 md32.md_data += ef->off;
1148 } else if (error != 0)
1150 md.md_version = md32.md_version;
1151 md.md_type = md32.md_type;
1152 md.md_cval = (const char *)(uintptr_t)md32.md_cval;
1153 md.md_data = (void *)(uintptr_t)md32.md_data;
1155 COPYOUT(v, &md, sizeof(md));
1156 error = __elfN(reloc_ptr)(fp, ef, v, &md, sizeof(md));
1157 if (error == EOPNOTSUPP) {
1158 md.md_cval += ef->off;
1159 md.md_data = (void *)((uintptr_t)md.md_data +
1160 (uintptr_t)ef->off);
1161 } else if (error != 0)
1164 p += sizeof(Elf_Addr);
1165 switch(md.md_type) {
1167 if (ef->kernel) /* kernel must not depend on anything */
1169 s = strdupout((vm_offset_t)md.md_cval);
1170 minfolen = sizeof(*mdepend) + strlen(s) + 1;
1171 mdepend = malloc(minfolen);
1172 if (mdepend == NULL)
1174 COPYOUT((vm_offset_t)md.md_data, mdepend,
1176 strcpy((char*)(mdepend + 1), s);
1178 file_addmetadata(fp, MODINFOMD_DEPLIST, minfolen,
1183 s = strdupout((vm_offset_t)md.md_cval);
1184 COPYOUT((vm_offset_t)md.md_data, &mver, sizeof(mver));
1185 file_addmodule(fp, s, mver.mv_version, NULL);
1192 s = fake_modname(fp->f_name);
1193 file_addmodule(fp, s, 1, NULL);
1199 static unsigned long
1200 elf_hash(const char *name)
1202 const unsigned char *p = (const unsigned char *) name;
1203 unsigned long h = 0;
1206 while (*p != '\0') {
1207 h = (h << 4) + *p++;
1208 if ((g = h & 0xf0000000) != 0)
1215 static const char __elfN(bad_symtable)[] = "elf" __XSTRING(__ELF_WORD_SIZE)
1216 "_lookup_symbol: corrupt symbol table\n";
1218 __elfN(lookup_symbol)(elf_file_t ef, const char* name, Elf_Sym *symp,
1226 if (ef->nbuckets == 0) {
1227 printf(__elfN(bad_symtable));
1231 hash = elf_hash(name);
1232 COPYOUT(&ef->buckets[hash % ef->nbuckets], &symnum, sizeof(symnum));
1234 while (symnum != STN_UNDEF) {
1235 if (symnum >= ef->nchains) {
1236 printf(__elfN(bad_symtable));
1240 COPYOUT(ef->symtab + symnum, &sym, sizeof(sym));
1241 if (sym.st_name == 0) {
1242 printf(__elfN(bad_symtable));
1246 strp = strdupout((vm_offset_t)(ef->strtab + sym.st_name));
1247 if (strcmp(name, strp) == 0) {
1249 if (sym.st_shndx != SHN_UNDEF ||
1250 (sym.st_value != 0 &&
1251 ELF_ST_TYPE(sym.st_info) == type)) {
1258 COPYOUT(&ef->chains[symnum], &symnum, sizeof(symnum));
1264 * Apply any intra-module relocations to the value. p is the load address
1265 * of the value and val/len is the value to be modified. This does NOT modify
1266 * the image in-place, because this is done by kern_linker later on.
1268 * Returns EOPNOTSUPP if no relocation method is supplied.
1271 __elfN(reloc_ptr)(struct preloaded_file *mp, elf_file_t ef,
1272 Elf_Addr p, void *val, size_t len)
1280 * The kernel is already relocated, but we still want to apply
1281 * offset adjustments.
1284 return (EOPNOTSUPP);
1286 for (n = 0; n < ef->relsz / sizeof(r); n++) {
1287 COPYOUT(ef->rel + n, &r, sizeof(r));
1289 error = __elfN(reloc)(ef, __elfN(symaddr), &r, ELF_RELOC_REL,
1290 ef->off, p, val, len);
1294 for (n = 0; n < ef->relasz / sizeof(a); n++) {
1295 COPYOUT(ef->rela + n, &a, sizeof(a));
1297 error = __elfN(reloc)(ef, __elfN(symaddr), &a, ELF_RELOC_RELA,
1298 ef->off, p, val, len);
1307 __elfN(symaddr)(struct elf_file *ef, Elf_Size symidx)
1310 /* Symbol lookup by index not required here. */