stand/common/load_elf.c

   1 /*-
   2  * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
   3  * Copyright (c) 1998 Peter Wemm <peter@freebsd.org>
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   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.
  14  *
  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
  25  * SUCH DAMAGE.
  26  */
  27
  28 #include <sys/cdefs.h>
  29 __FBSDID("$FreeBSD$");
  30
  31 #include <sys/param.h>
  32 #include <sys/endian.h>
  33 #include <sys/exec.h>
  34 #include <sys/linker.h>
  35 #include <sys/module.h>
  36 #include <sys/stdint.h>
  37 #include <string.h>
  38 #include <machine/elf.h>
  39 #include <stand.h>
  40 #define FREEBSD_ELF
  41 #include <sys/link_elf.h>
  42
  43 #include "bootstrap.h"
  44
  45 #define COPYOUT(s,d,l)  archsw.arch_copyout((vm_offset_t)(s), d, l)
  46
  47 #if defined(__i386__) && __ELF_WORD_SIZE == 64
  48 #undef ELF_TARG_CLASS
  49 #undef ELF_TARG_MACH
  50 #define ELF_TARG_CLASS  ELFCLASS64
  51 #define ELF_TARG_MACH   EM_X86_64
  52 #endif
  53
  54 typedef struct elf_file {
  55         Elf_Phdr        *ph;
  56         Elf_Ehdr        *ehdr;
  57         Elf_Sym         *symtab;
  58         Elf_Hashelt     *hashtab;
  59         Elf_Hashelt     nbuckets;
  60         Elf_Hashelt     nchains;
  61         Elf_Hashelt     *buckets;
  62         Elf_Hashelt     *chains;
  63         Elf_Rel *rel;
  64         size_t  relsz;
  65         Elf_Rela        *rela;
  66         size_t  relasz;
  67         char    *strtab;
  68         size_t  strsz;
  69         int             fd;
  70         caddr_t firstpage;
  71         size_t  firstlen;
  72         int             kernel;
  73         uint64_t        off;
  74 #ifdef LOADER_VERIEXEC_VECTX
  75         struct vectx    *vctx;
  76 #endif
  77 } *elf_file_t;
  78
  79 #ifdef LOADER_VERIEXEC_VECTX
  80 #define VECTX_HANDLE(ef) (ef)->vctx
  81 #else
  82 #define VECTX_HANDLE(ef) (ef)->fd
  83 #endif
  84
  85 static int __elfN(loadimage)(struct preloaded_file *mp, elf_file_t ef,
  86     uint64_t loadaddr);
  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);
  95
  96 const char      *__elfN(kerneltype) = "elf kernel";
  97 const char      *__elfN(moduletype) = "elf module";
  98
  99 uint64_t        __elfN(relocation_offset) = 0;
 100
 101 extern void elf_wrong_field_size(void);
 102 #define CONVERT_FIELD(b, f, e)                  \
 103         switch (sizeof((b)->f)) {               \
 104         case 2:                                 \
 105                 (b)->f = e ## 16toh((b)->f);    \
 106                 break;                          \
 107         case 4:                                 \
 108                 (b)->f = e ## 32toh((b)->f);    \
 109                 break;                          \
 110         case 8:                                 \
 111                 (b)->f = e ## 64toh((b)->f);    \
 112                 break;                          \
 113         default:                                \
 114                 /* Force a link time error. */  \
 115                 elf_wrong_field_size();         \
 116                 break;                          \
 117         }
 118
 119 #define CONVERT_SWITCH(h, d, f)                 \
 120         switch ((h)->e_ident[EI_DATA]) {        \
 121         case ELFDATA2MSB:                       \
 122                 f(d, be);                       \
 123                 break;                          \
 124         case ELFDATA2LSB:                       \
 125                 f(d, le);                       \
 126                 break;                          \
 127         default:                                \
 128                 return (EINVAL);                \
 129         }
 130
 131
 132 static int elf_header_convert(Elf_Ehdr *ehdr)
 133 {
 134         /*
 135          * Fixup ELF header endianness.
 136          *
 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
 141          * architecture.
 142          */
 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)
 157
 158         CONVERT_SWITCH(ehdr, ehdr, HEADER_FIELDS);
 159
 160 #undef HEADER_FIELDS
 161
 162         return (0);
 163 }
 164
 165 static int elf_program_header_convert(const Elf_Ehdr *ehdr, Elf_Phdr *phdr)
 166 {
 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)
 176
 177         CONVERT_SWITCH(ehdr, phdr, PROGRAM_HEADER_FIELDS);
 178
 179 #undef PROGRAM_HEADER_FIELDS
 180
 181         return (0);
 182 }
 183
 184 static int elf_section_header_convert(const Elf_Ehdr *ehdr, Elf_Shdr *shdr)
 185 {
 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)
 197
 198         CONVERT_SWITCH(ehdr, shdr, SECTION_HEADER_FIELDS);
 199
 200 #undef SECTION_HEADER_FIELDS
 201
 202         return (0);
 203 }
 204 #undef CONVERT_SWITCH
 205 #undef CONVERT_FIELD
 206
 207
 208 #ifdef __amd64__
 209 static bool
 210 is_kernphys_relocatable(elf_file_t ef)
 211 {
 212         Elf_Sym sym;
 213
 214         return (__elfN(lookup_symbol)(ef, "kernphys", &sym, STT_OBJECT) == 0 &&
 215             sym.st_size == 8);
 216 }
 217 #endif
 218
 219 #ifdef __i386__
 220 static bool
 221 is_tg_kernel_support(struct preloaded_file *fp, elf_file_t ef)
 222 {
 223         Elf_Sym         sym;
 224         Elf_Addr        p_start, p_end, v, p;
 225         char            vd_name[16];
 226         int             error;
 227
 228         if (__elfN(lookup_symbol)(ef, "__start_set_vt_drv_set", &sym, STT_NOTYPE) != 0)
 229                 return (false);
 230         p_start = sym.st_value + ef->off;
 231         if (__elfN(lookup_symbol)(ef, "__stop_set_vt_drv_set", &sym, STT_NOTYPE) != 0)
 232                 return (false);
 233         p_end = sym.st_value + ef->off;
 234
 235         /*
 236          * Walk through vt_drv_set, each vt driver structure starts with
 237          * static 16 chars for driver name. If we have "vbefb", return true.
 238          */
 239         for (p = p_start; p < p_end; p += sizeof(Elf_Addr)) {
 240                 COPYOUT(p, &v, sizeof(v));
 241
 242                 error = __elfN(reloc_ptr)(fp, ef, p, &v, sizeof(v));
 243                 if (error == EOPNOTSUPP)
 244                         v += ef->off;
 245                 else if (error != 0)
 246                         return (false);
 247                 COPYOUT(v, &vd_name, sizeof(vd_name));
 248                 if (strncmp(vd_name, "vbefb", sizeof(vd_name)) == 0)
 249                         return (true);
 250         }
 251
 252         return (false);
 253 }
 254 #endif
 255
 256 static int
 257 __elfN(load_elf_header)(char *filename, elf_file_t ef)
 258 {
 259         ssize_t                  bytes_read;
 260         Elf_Ehdr                *ehdr;
 261         int                      err;
 262
 263         /*
 264          * Open the image, read and validate the ELF header
 265          */
 266         if (filename == NULL)   /* can't handle nameless */
 267                 return (EFTYPE);
 268         if ((ef->fd = open(filename, O_RDONLY)) == -1)
 269                 return (errno);
 270         ef->firstpage = malloc(PAGE_SIZE);
 271         if (ef->firstpage == NULL) {
 272                 close(ef->fd);
 273                 return (ENOMEM);
 274         }
 275 #ifdef LOADER_VERIEXEC_VECTX
 276         {
 277                 int verror;
 278
 279                 ef->vctx = vectx_open(ef->fd, filename, 0L, NULL, &verror, __func__);
 280                 if (verror) {
 281                         printf("Unverified %s: %s\n", filename, ve_error_get());
 282                         close(ef->fd);
 283                         free(ef->vctx);
 284                         return (EAUTH);
 285                 }
 286         }
 287 #endif
 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 */
 292                 goto error;
 293         }
 294         ehdr = ef->ehdr = (Elf_Ehdr *)ef->firstpage;
 295
 296         /* Is it ELF? */
 297         if (!IS_ELF(*ehdr)) {
 298                 err = EFTYPE;
 299                 goto error;
 300         }
 301
 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 ? */ {
 305                 err = EFTYPE;
 306                 goto error;
 307         }
 308
 309         err = elf_header_convert(ehdr);
 310         if (err)
 311                 goto error;
 312
 313         if (ehdr->e_version != EV_CURRENT || ehdr->e_machine != ELF_TARG_MACH) {
 314                 /* Machine ? */
 315                 err = EFTYPE;
 316                 goto error;
 317         }
 318
 319 #if defined(LOADER_VERIEXEC) && !defined(LOADER_VERIEXEC_VECTX)
 320         if (verify_file(ef->fd, filename, bytes_read, VE_MUST, __func__) < 0) {
 321                 err = EAUTH;
 322                 goto error;
 323         }
 324 #endif
 325         return (0);
 326
 327 error:
 328         if (ef->firstpage != NULL) {
 329                 free(ef->firstpage);
 330                 ef->firstpage = NULL;
 331         }
 332         if (ef->fd != -1) {
 333 #ifdef LOADER_VERIEXEC_VECTX
 334                 free(ef->vctx);
 335 #endif
 336                 close(ef->fd);
 337                 ef->fd = -1;
 338         }
 339         return (err);
 340 }
 341
 342 /*
 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).
 346  */
 347 int
 348 __elfN(loadfile)(char *filename, uint64_t dest, struct preloaded_file **result)
 349 {
 350         return (__elfN(loadfile_raw)(filename, dest, result, 0));
 351 }
 352
 353 int
 354 __elfN(loadfile_raw)(char *filename, uint64_t dest,
 355     struct preloaded_file **result, int multiboot)
 356 {
 357         struct preloaded_file   *fp, *kfp;
 358         struct elf_file         ef;
 359         Elf_Ehdr                *ehdr;
 360         int                     err;
 361
 362         fp = NULL;
 363         bzero(&ef, sizeof(struct elf_file));
 364         ef.fd = -1;
 365
 366         err = __elfN(load_elf_header)(filename, &ef);
 367         if (err != 0)
 368                 return (err);
 369
 370         ehdr = ef.ehdr;
 371
 372         /*
 373          * Check to see what sort of module we are.
 374          */
 375         kfp = file_findfile(NULL, __elfN(kerneltype));
 376 #ifdef __powerpc__
 377         /*
 378          * Kernels can be ET_DYN, so just assume the first loaded object is the
 379          * kernel. This assumption will be checked later.
 380          */
 381         if (kfp == NULL)
 382                 ef.kernel = 1;
 383 #endif
 384         if (ef.kernel || ehdr->e_type == ET_EXEC) {
 385                 /* Looks like a kernel */
 386                 if (kfp != NULL) {
 387                         printf("elf" __XSTRING(__ELF_WORD_SIZE)
 388                             "_loadfile: kernel already loaded\n");
 389                         err = EPERM;
 390                         goto oerr;
 391                 }
 392                 /*
 393                  * Calculate destination address based on kernel entrypoint.
 394                  *
 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.
 399                  */
 400 #ifndef __arm__
 401                 if (ehdr->e_type == ET_EXEC)
 402                         dest = (ehdr->e_entry & ~PAGE_MASK);
 403 #endif
 404                 if ((ehdr->e_entry & ~PAGE_MASK) == 0) {
 405                         printf("elf" __XSTRING(__ELF_WORD_SIZE)
 406                             "_loadfile: not a kernel (maybe static binary?)\n");
 407                         err = EPERM;
 408                         goto oerr;
 409                 }
 410                 ef.kernel = 1;
 411
 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");
 417                         err = EPERM;
 418                         goto oerr;
 419                 }
 420                 if (kfp == NULL) {
 421                         printf("elf" __XSTRING(__ELF_WORD_SIZE)
 422                             "_loadfile: can't load module before kernel\n");
 423                         err = EPERM;
 424                         goto oerr;
 425                 }
 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",
 429                             kfp->f_type);
 430                         err = EPERM;
 431                         goto oerr;
 432                 }
 433                 /* Looks OK, got ahead */
 434                 ef.kernel = 0;
 435
 436         } else {
 437                 err = EFTYPE;
 438                 goto oerr;
 439         }
 440
 441         if (archsw.arch_loadaddr != NULL)
 442                 dest = archsw.arch_loadaddr(LOAD_ELF, ehdr, dest);
 443         else
 444                 dest = roundup(dest, PAGE_SIZE);
 445
 446         /*
 447          * Ok, we think we should handle this.
 448          */
 449         fp = file_alloc();
 450         if (fp == NULL) {
 451                 printf("elf" __XSTRING(__ELF_WORD_SIZE)
 452                     "_loadfile: cannot allocate module info\n");
 453                 err = EPERM;
 454                 goto out;
 455         }
 456         if (ef.kernel == 1 && multiboot == 0)
 457                 setenv("kernelname", filename, 1);
 458         fp->f_name = strdup(filename);
 459         if (multiboot == 0)
 460                 fp->f_type = strdup(ef.kernel ?
 461                     __elfN(kerneltype) : __elfN(moduletype));
 462         else
 463                 fp->f_type = strdup("elf multiboot kernel");
 464
 465 #ifdef ELF_VERBOSE
 466         if (ef.kernel)
 467                 printf("%s entry at 0x%jx\n", filename,
 468                     (uintmax_t)ehdr->e_entry);
 469 #else
 470         printf("%s ", filename);
 471 #endif
 472
 473         fp->f_size = __elfN(loadimage)(fp, &ef, dest);
 474         if (fp->f_size == 0 || fp->f_addr == 0)
 475                 goto ioerr;
 476
 477         /* save exec header as metadata */
 478         file_addmetadata(fp, MODINFOMD_ELFHDR, sizeof(*ehdr), ehdr);
 479
 480         /* Load OK, return module pointer */
 481         *result = (struct preloaded_file *)fp;
 482         err = 0;
 483 #ifdef __amd64__
 484         fp->f_kernphys_relocatable = multiboot || is_kernphys_relocatable(&ef);
 485 #endif
 486 #ifdef __i386__
 487         fp->f_tg_kernel_support = is_tg_kernel_support(fp, &ef);
 488 #endif
 489         goto out;
 490
 491 ioerr:
 492         err = EIO;
 493 oerr:
 494         file_discard(fp);
 495 out:
 496         if (ef.firstpage)
 497                 free(ef.firstpage);
 498         if (ef.fd != -1) {
 499 #ifdef LOADER_VERIEXEC_VECTX
 500                 if (!err && ef.vctx) {
 501                         int verror;
 502
 503                         verror = vectx_close(ef.vctx, VE_MUST, __func__);
 504                         if (verror) {
 505                                 err = EAUTH;
 506                                 file_discard(fp);
 507                         }
 508                 }
 509 #endif
 510                 close(ef.fd);
 511         }
 512         return (err);
 513 }
 514
 515 /*
 516  * With the file (fd) open on the image, and (ehdr) containing
 517  * the Elf header, load the image at (off)
 518  */
 519 static int
 520 __elfN(loadimage)(struct preloaded_file *fp, elf_file_t ef, uint64_t off)
 521 {
 522         int             i;
 523         u_int           j;
 524         Elf_Ehdr        *ehdr;
 525         Elf_Phdr        *phdr, *php;
 526         Elf_Shdr        *shdr;
 527         char            *shstr;
 528         int             ret;
 529         vm_offset_t     firstaddr;
 530         vm_offset_t     lastaddr;
 531         size_t          chunk;
 532         ssize_t         result;
 533         Elf_Addr        ssym, esym;
 534         Elf_Dyn         *dp;
 535         Elf_Addr        adp;
 536         Elf_Addr        ctors;
 537         int             ndp;
 538         int             symstrindex;
 539         int             symtabindex;
 540         Elf_Size        size;
 541         u_int           fpcopy;
 542         Elf_Sym         sym;
 543         Elf_Addr        p_start, p_end;
 544
 545         dp = NULL;
 546         shdr = NULL;
 547         ret = 0;
 548         firstaddr = lastaddr = 0;
 549         ehdr = ef->ehdr;
 550 #ifdef __powerpc__
 551         if (ef->kernel) {
 552 #else
 553         if (ehdr->e_type == ET_EXEC) {
 554 #endif
 555 #if defined(__i386__) || defined(__amd64__)
 556 #if __ELF_WORD_SIZE == 64
 557                 /* x86_64 relocates after locore */
 558                 off = - (off & 0xffffffffff000000ull);
 559 #else
 560                 /* i386 relocates after locore */
 561                 off = - (off & 0xff000000u);
 562 #endif
 563 #elif defined(__powerpc__)
 564                 /*
 565                  * On the purely virtual memory machines like e500, the kernel
 566                  * is linked against its final VA range, which is most often
 567                  * not available at the loader stage, but only after kernel
 568                  * initializes and completes its VM settings. In such cases we
 569                  * cannot use p_vaddr field directly to load ELF segments, but
 570                  * put them at some 'load-time' locations.
 571                  */
 572                 if (off & 0xf0000000u) {
 573                         off = -(off & 0xf0000000u);
 574                         /*
 575                          * XXX the physical load address should not be
 576                          * hardcoded. Note that the Book-E kernel assumes that
 577                          * it's loaded at a 16MB boundary for now...
 578                          */
 579                         off += 0x01000000;
 580                 }
 581                 ehdr->e_entry += off;
 582 #ifdef ELF_VERBOSE
 583                 printf("Converted entry 0x%jx\n", (uintmax_t)ehdr->e_entry);
 584 #endif
 585 #elif defined(__arm__) && !defined(EFI)
 586                 /*
 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.
 597                  *
 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
 602                  * by the efi code.
 603                  */
 604                 off -= ehdr->e_entry & ~PAGE_MASK;
 605                 ehdr->e_entry += off;
 606 #ifdef ELF_VERBOSE
 607                 printf("ehdr->e_entry 0x%jx, va<->pa off %llx\n",
 608                     (uintmax_t)ehdr->e_entry, off);
 609 #endif
 610 #else
 611                 off = 0;        /* other archs use direct mapped kernels */
 612 #endif
 613         }
 614         ef->off = off;
 615
 616         if (ef->kernel)
 617                 __elfN(relocation_offset) = off;
 618
 619         if ((ehdr->e_phoff + ehdr->e_phnum * sizeof(*phdr)) > ef->firstlen) {
 620                 printf("elf" __XSTRING(__ELF_WORD_SIZE)
 621                     "_loadimage: program header not within first page\n");
 622                 goto out;
 623         }
 624         phdr = (Elf_Phdr *)(ef->firstpage + ehdr->e_phoff);
 625
 626         for (i = 0; i < ehdr->e_phnum; i++) {
 627                 if (elf_program_header_convert(ehdr, phdr))
 628                         continue;
 629
 630                 /* We want to load PT_LOAD segments only.. */
 631                 if (phdr[i].p_type != PT_LOAD)
 632                         continue;
 633
 634 #ifdef ELF_VERBOSE
 635                 printf("Segment: 0x%lx@0x%lx -> 0x%lx-0x%lx",
 636                     (long)phdr[i].p_filesz, (long)phdr[i].p_offset,
 637                     (long)(phdr[i].p_vaddr + off),
 638                     (long)(phdr[i].p_vaddr + off + phdr[i].p_memsz - 1));
 639 #else
 640                 if ((phdr[i].p_flags & PF_W) == 0) {
 641                         printf("text=0x%lx ", (long)phdr[i].p_filesz);
 642                 } else {
 643                         printf("data=0x%lx", (long)phdr[i].p_filesz);
 644                         if (phdr[i].p_filesz < phdr[i].p_memsz)
 645                                 printf("+0x%lx", (long)(phdr[i].p_memsz -
 646                                     phdr[i].p_filesz));
 647                         printf(" ");
 648                 }
 649 #endif
 650                 fpcopy = 0;
 651                 if (ef->firstlen > phdr[i].p_offset) {
 652                         fpcopy = ef->firstlen - phdr[i].p_offset;
 653                         archsw.arch_copyin(ef->firstpage + phdr[i].p_offset,
 654                             phdr[i].p_vaddr + off, fpcopy);
 655                 }
 656                 if (phdr[i].p_filesz > fpcopy) {
 657                         if (kern_pread(VECTX_HANDLE(ef),
 658                             phdr[i].p_vaddr + off + fpcopy,
 659                             phdr[i].p_filesz - fpcopy,
 660                             phdr[i].p_offset + fpcopy) != 0) {
 661                                 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
 662                                     "_loadimage: read failed\n");
 663                                 goto out;
 664                         }
 665                 }
 666                 /* clear space from oversized segments; eg: bss */
 667                 if (phdr[i].p_filesz < phdr[i].p_memsz) {
 668 #ifdef ELF_VERBOSE
 669                         printf(" (bss: 0x%lx-0x%lx)",
 670                             (long)(phdr[i].p_vaddr + off + phdr[i].p_filesz),
 671                             (long)(phdr[i].p_vaddr + off + phdr[i].p_memsz -1));
 672 #endif
 673
 674                         kern_bzero(phdr[i].p_vaddr + off + phdr[i].p_filesz,
 675                             phdr[i].p_memsz - phdr[i].p_filesz);
 676                 }
 677 #ifdef ELF_VERBOSE
 678                 printf("\n");
 679 #endif
 680
 681                 if (archsw.arch_loadseg != NULL)
 682                         archsw.arch_loadseg(ehdr, phdr + i, off);
 683
 684                 if (firstaddr == 0 || firstaddr > (phdr[i].p_vaddr + off))
 685                         firstaddr = phdr[i].p_vaddr + off;
 686                 if (lastaddr == 0 || lastaddr <
 687                     (phdr[i].p_vaddr + off + phdr[i].p_memsz))
 688                         lastaddr = phdr[i].p_vaddr + off + phdr[i].p_memsz;
 689         }
 690         lastaddr = roundup(lastaddr, sizeof(long));
 691
 692         /*
 693          * Get the section headers.  We need this for finding the .ctors
 694          * section as well as for loading any symbols.  Both may be hard
 695          * to do if reading from a .gz file as it involves seeking.  I
 696          * think the rule is going to have to be that you must strip a
 697          * file to remove symbols before gzipping it.
 698          */
 699         chunk = (size_t)ehdr->e_shnum * (size_t)ehdr->e_shentsize;
 700         if (chunk == 0 || ehdr->e_shoff == 0)
 701                 goto nosyms;
 702         shdr = alloc_pread(VECTX_HANDLE(ef), ehdr->e_shoff, chunk);
 703         if (shdr == NULL) {
 704                 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
 705                     "_loadimage: failed to read section headers");
 706                 goto nosyms;
 707         }
 708
 709         for (i = 0; i < ehdr->e_shnum; i++)
 710                 elf_section_header_convert(ehdr, &shdr[i]);
 711
 712         file_addmetadata(fp, MODINFOMD_SHDR, chunk, shdr);
 713
 714         /*
 715          * Read the section string table and look for the .ctors section.
 716          * We need to tell the kernel where it is so that it can call the
 717          * ctors.
 718          */
 719         chunk = shdr[ehdr->e_shstrndx].sh_size;
 720         if (chunk) {
 721                 shstr = alloc_pread(VECTX_HANDLE(ef),
 722                     shdr[ehdr->e_shstrndx].sh_offset, chunk);
 723                 if (shstr) {
 724                         for (i = 0; i < ehdr->e_shnum; i++) {
 725                                 if (strcmp(shstr + shdr[i].sh_name,
 726                                     ".ctors") != 0)
 727                                         continue;
 728                                 ctors = shdr[i].sh_addr;
 729                                 file_addmetadata(fp, MODINFOMD_CTORS_ADDR,
 730                                     sizeof(ctors), &ctors);
 731                                 size = shdr[i].sh_size;
 732                                 file_addmetadata(fp, MODINFOMD_CTORS_SIZE,
 733                                     sizeof(size), &size);
 734                                 break;
 735                         }
 736                         free(shstr);
 737                 }
 738         }
 739
 740         /*
 741          * Now load any symbols.
 742          */
 743         symtabindex = -1;
 744         symstrindex = -1;
 745         for (i = 0; i < ehdr->e_shnum; i++) {
 746                 if (shdr[i].sh_type != SHT_SYMTAB)
 747                         continue;
 748                 for (j = 0; j < ehdr->e_phnum; j++) {
 749                         if (phdr[j].p_type != PT_LOAD)
 750                                 continue;
 751                         if (shdr[i].sh_offset >= phdr[j].p_offset &&
 752                             (shdr[i].sh_offset + shdr[i].sh_size <=
 753                             phdr[j].p_offset + phdr[j].p_filesz)) {
 754                                 shdr[i].sh_offset = 0;
 755                                 shdr[i].sh_size = 0;
 756                                 break;
 757                         }
 758                 }
 759                 if (shdr[i].sh_offset == 0 || shdr[i].sh_size == 0)
 760                         continue;       /* alread loaded in a PT_LOAD above */
 761                 /* Save it for loading below */
 762                 symtabindex = i;
 763                 symstrindex = shdr[i].sh_link;
 764         }
 765         if (symtabindex < 0 || symstrindex < 0)
 766                 goto nosyms;
 767
 768         /* Ok, committed to a load. */
 769 #ifndef ELF_VERBOSE
 770         printf("syms=[");
 771 #endif
 772         ssym = lastaddr;
 773         for (i = symtabindex; i >= 0; i = symstrindex) {
 774 #ifdef ELF_VERBOSE
 775                 char    *secname;
 776
 777                 switch(shdr[i].sh_type) {
 778                 case SHT_SYMTAB:                /* Symbol table */
 779                         secname = "symtab";
 780                         break;
 781                 case SHT_STRTAB:                /* String table */
 782                         secname = "strtab";
 783                         break;
 784                 default:
 785                         secname = "WHOA!!";
 786                         break;
 787                 }
 788 #endif
 789                 size = shdr[i].sh_size;
 790
 791                 archsw.arch_copyin(&size, lastaddr, sizeof(size));
 792                 lastaddr += sizeof(size);
 793
 794 #ifdef ELF_VERBOSE
 795                 printf("\n%s: 0x%jx@0x%jx -> 0x%jx-0x%jx", secname,
 796                     (uintmax_t)shdr[i].sh_size, (uintmax_t)shdr[i].sh_offset,
 797                     (uintmax_t)lastaddr,
 798                     (uintmax_t)(lastaddr + shdr[i].sh_size));
 799 #else
 800                 if (i == symstrindex)
 801                         printf("+");
 802                 printf("0x%lx+0x%lx", (long)sizeof(size), (long)size);
 803 #endif
 804
 805                 if (VECTX_LSEEK(VECTX_HANDLE(ef), (off_t)shdr[i].sh_offset, SEEK_SET) == -1) {
 806                         printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
 807                            "_loadimage: could not seek for symbols - skipped!");
 808                         lastaddr = ssym;
 809                         ssym = 0;
 810                         goto nosyms;
 811                 }
 812                 result = archsw.arch_readin(VECTX_HANDLE(ef), lastaddr, shdr[i].sh_size);
 813                 if (result < 0 || (size_t)result != shdr[i].sh_size) {
 814                         printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
 815                             "_loadimage: could not read symbols - skipped! "
 816                             "(%ju != %ju)", (uintmax_t)result,
 817                             (uintmax_t)shdr[i].sh_size);
 818                         lastaddr = ssym;
 819                         ssym = 0;
 820                         goto nosyms;
 821                 }
 822                 /* Reset offsets relative to ssym */
 823                 lastaddr += shdr[i].sh_size;
 824                 lastaddr = roundup(lastaddr, sizeof(size));
 825                 if (i == symtabindex)
 826                         symtabindex = -1;
 827                 else if (i == symstrindex)
 828                         symstrindex = -1;
 829         }
 830         esym = lastaddr;
 831 #ifndef ELF_VERBOSE
 832         printf("]");
 833 #endif
 834
 835         file_addmetadata(fp, MODINFOMD_SSYM, sizeof(ssym), &ssym);
 836         file_addmetadata(fp, MODINFOMD_ESYM, sizeof(esym), &esym);
 837
 838 nosyms:
 839         printf("\n");
 840
 841         ret = lastaddr - firstaddr;
 842         fp->f_addr = firstaddr;
 843
 844         php = NULL;
 845         for (i = 0; i < ehdr->e_phnum; i++) {
 846                 if (phdr[i].p_type == PT_DYNAMIC) {
 847                         php = phdr + i;
 848                         adp = php->p_vaddr;
 849                         file_addmetadata(fp, MODINFOMD_DYNAMIC, sizeof(adp),
 850                             &adp);
 851                         break;
 852                 }
 853         }
 854
 855         if (php == NULL) /* this is bad, we cannot get to symbols or _DYNAMIC */
 856                 goto out;
 857
 858         ndp = php->p_filesz / sizeof(Elf_Dyn);
 859         if (ndp == 0)
 860                 goto out;
 861         dp = malloc(php->p_filesz);
 862         if (dp == NULL)
 863                 goto out;
 864         archsw.arch_copyout(php->p_vaddr + off, dp, php->p_filesz);
 865
 866         ef->strsz = 0;
 867         for (i = 0; i < ndp; i++) {
 868                 if (dp[i].d_tag == 0)
 869                         break;
 870                 switch (dp[i].d_tag) {
 871                 case DT_HASH:
 872                         ef->hashtab =
 873                             (Elf_Hashelt*)(uintptr_t)(dp[i].d_un.d_ptr + off);
 874                         break;
 875                 case DT_STRTAB:
 876                         ef->strtab =
 877                             (char *)(uintptr_t)(dp[i].d_un.d_ptr + off);
 878                         break;
 879                 case DT_STRSZ:
 880                         ef->strsz = dp[i].d_un.d_val;
 881                         break;
 882                 case DT_SYMTAB:
 883                         ef->symtab =
 884                             (Elf_Sym *)(uintptr_t)(dp[i].d_un.d_ptr + off);
 885                         break;
 886                 case DT_REL:
 887                         ef->rel =
 888                             (Elf_Rel *)(uintptr_t)(dp[i].d_un.d_ptr + off);
 889                         break;
 890                 case DT_RELSZ:
 891                         ef->relsz = dp[i].d_un.d_val;
 892                         break;
 893                 case DT_RELA:
 894                         ef->rela =
 895                             (Elf_Rela *)(uintptr_t)(dp[i].d_un.d_ptr + off);
 896                         break;
 897                 case DT_RELASZ:
 898                         ef->relasz = dp[i].d_un.d_val;
 899                         break;
 900                 default:
 901                         break;
 902                 }
 903         }
 904         if (ef->hashtab == NULL || ef->symtab == NULL ||
 905             ef->strtab == NULL || ef->strsz == 0)
 906                 goto out;
 907         COPYOUT(ef->hashtab, &ef->nbuckets, sizeof(ef->nbuckets));
 908         COPYOUT(ef->hashtab + 1, &ef->nchains, sizeof(ef->nchains));
 909         ef->buckets = ef->hashtab + 2;
 910         ef->chains = ef->buckets + ef->nbuckets;
 911
 912         if (__elfN(lookup_symbol)(ef, "__start_set_modmetadata_set", &sym,
 913             STT_NOTYPE) != 0)
 914                 return 0;
 915         p_start = sym.st_value + ef->off;
 916         if (__elfN(lookup_symbol)(ef, "__stop_set_modmetadata_set", &sym,
 917             STT_NOTYPE) != 0)
 918                 return 0;
 919         p_end = sym.st_value + ef->off;
 920
 921         if (__elfN(parse_modmetadata)(fp, ef, p_start, p_end) == 0)
 922                 goto out;
 923
 924         if (ef->kernel)         /* kernel must not depend on anything */
 925                 goto out;
 926
 927 out:
 928         if (dp)
 929                 free(dp);
 930         if (shdr)
 931                 free(shdr);
 932         return ret;
 933 }
 934
 935 static char invalid_name[] = "bad";
 936
 937 char *
 938 fake_modname(const char *name)
 939 {
 940         const char *sp, *ep;
 941         char *fp;
 942         size_t len;
 943
 944         sp = strrchr(name, '/');
 945         if (sp)
 946                 sp++;
 947         else
 948                 sp = name;
 949
 950         ep = strrchr(sp, '.');
 951         if (ep == NULL) {
 952                 ep = sp + strlen(sp);
 953         }
 954         if (ep == sp) {
 955                 sp = invalid_name;
 956                 ep = invalid_name + sizeof(invalid_name) - 1;
 957         }
 958
 959         len = ep - sp;
 960         fp = malloc(len + 1);
 961         if (fp == NULL)
 962                 return NULL;
 963         memcpy(fp, sp, len);
 964         fp[len] = '\0';
 965         return fp;
 966 }
 967
 968 #if (defined(__i386__) || defined(__powerpc__)) && __ELF_WORD_SIZE == 64
 969 struct mod_metadata64 {
 970         int             md_version;     /* structure version MDTV_* */
 971         int             md_type;        /* type of entry MDT_* */
 972         uint64_t        md_data;        /* specific data */
 973         uint64_t        md_cval;        /* common string label */
 974 };
 975 #endif
 976 #if defined(__amd64__) && __ELF_WORD_SIZE == 32
 977 struct mod_metadata32 {
 978         int             md_version;     /* structure version MDTV_* */
 979         int             md_type;        /* type of entry MDT_* */
 980         uint32_t        md_data;        /* specific data */
 981         uint32_t        md_cval;        /* common string label */
 982 };
 983 #endif
 984
 985 int
 986 __elfN(load_modmetadata)(struct preloaded_file *fp, uint64_t dest)
 987 {
 988         struct elf_file          ef;
 989         int                      err, i, j;
 990         Elf_Shdr                *sh_meta, *shdr = NULL;
 991         Elf_Shdr                *sh_data[2];
 992         char                    *shstrtab = NULL;
 993         size_t                   size;
 994         Elf_Addr                 p_start, p_end;
 995
 996         bzero(&ef, sizeof(struct elf_file));
 997         ef.fd = -1;
 998
 999         err = __elfN(load_elf_header)(fp->f_name, &ef);
1000         if (err != 0)
1001                 goto out;
1002
1003         if (ef.kernel == 1 || ef.ehdr->e_type == ET_EXEC) {
1004                 ef.kernel = 1;
1005         } else if (ef.ehdr->e_type != ET_DYN) {
1006                 err = EFTYPE;
1007                 goto out;
1008         }
1009
1010         size = (size_t)ef.ehdr->e_shnum * (size_t)ef.ehdr->e_shentsize;
1011         shdr = alloc_pread(VECTX_HANDLE(&ef), ef.ehdr->e_shoff, size);
1012         if (shdr == NULL) {
1013                 err = ENOMEM;
1014                 goto out;
1015         }
1016
1017         /* Load shstrtab. */
1018         shstrtab = alloc_pread(VECTX_HANDLE(&ef), shdr[ef.ehdr->e_shstrndx].sh_offset,
1019             shdr[ef.ehdr->e_shstrndx].sh_size);
1020         if (shstrtab == NULL) {
1021                 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
1022                     "load_modmetadata: unable to load shstrtab\n");
1023                 err = EFTYPE;
1024                 goto out;
1025         }
1026
1027         /* Find set_modmetadata_set and data sections. */
1028         sh_data[0] = sh_data[1] = sh_meta = NULL;
1029         for (i = 0, j = 0; i < ef.ehdr->e_shnum; i++) {
1030                 if (strcmp(&shstrtab[shdr[i].sh_name],
1031                     "set_modmetadata_set") == 0) {
1032                         sh_meta = &shdr[i];
1033                 }
1034                 if ((strcmp(&shstrtab[shdr[i].sh_name], ".data") == 0) ||
1035                     (strcmp(&shstrtab[shdr[i].sh_name], ".rodata") == 0)) {
1036                         sh_data[j++] = &shdr[i];
1037                 }
1038         }
1039         if (sh_meta == NULL || sh_data[0] == NULL || sh_data[1] == NULL) {
1040                 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
1041     "load_modmetadata: unable to find set_modmetadata_set or data sections\n");
1042                 err = EFTYPE;
1043                 goto out;
1044         }
1045
1046         /* Load set_modmetadata_set into memory */
1047         err = kern_pread(VECTX_HANDLE(&ef), dest, sh_meta->sh_size, sh_meta->sh_offset);
1048         if (err != 0) {
1049                 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
1050     "load_modmetadata: unable to load set_modmetadata_set: %d\n", err);
1051                 goto out;
1052         }
1053         p_start = dest;
1054         p_end = dest + sh_meta->sh_size;
1055         dest += sh_meta->sh_size;
1056
1057         /* Load data sections into memory. */
1058         err = kern_pread(VECTX_HANDLE(&ef), dest, sh_data[0]->sh_size,
1059             sh_data[0]->sh_offset);
1060         if (err != 0) {
1061                 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
1062                     "load_modmetadata: unable to load data: %d\n", err);
1063                 goto out;
1064         }
1065
1066         /*
1067          * We have to increment the dest, so that the offset is the same into
1068          * both the .rodata and .data sections.
1069          */
1070         ef.off = -(sh_data[0]->sh_addr - dest);
1071         dest += (sh_data[1]->sh_addr - sh_data[0]->sh_addr);
1072
1073         err = kern_pread(VECTX_HANDLE(&ef), dest, sh_data[1]->sh_size,
1074             sh_data[1]->sh_offset);
1075         if (err != 0) {
1076                 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
1077                     "load_modmetadata: unable to load data: %d\n", err);
1078                 goto out;
1079         }
1080
1081         err = __elfN(parse_modmetadata)(fp, &ef, p_start, p_end);
1082         if (err != 0) {
1083                 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
1084                     "load_modmetadata: unable to parse metadata: %d\n", err);
1085                 goto out;
1086         }
1087
1088 out:
1089         if (shstrtab != NULL)
1090                 free(shstrtab);
1091         if (shdr != NULL)
1092                 free(shdr);
1093         if (ef.firstpage != NULL)
1094                 free(ef.firstpage);
1095         if (ef.fd != -1) {
1096 #ifdef LOADER_VERIEXEC_VECTX
1097                 if (!err && ef.vctx) {
1098                         int verror;
1099
1100                         verror = vectx_close(ef.vctx, VE_MUST, __func__);
1101                         if (verror) {
1102                                 err = EAUTH;
1103                                 file_discard(fp);
1104                         }
1105                 }
1106 #endif
1107                 close(ef.fd);
1108         }
1109         return (err);
1110 }
1111
1112 int
1113 __elfN(parse_modmetadata)(struct preloaded_file *fp, elf_file_t ef,
1114     Elf_Addr p_start, Elf_Addr p_end)
1115 {
1116         struct mod_metadata md;
1117 #if (defined(__i386__) || defined(__powerpc__)) && __ELF_WORD_SIZE == 64
1118         struct mod_metadata64 md64;
1119 #elif defined(__amd64__) && __ELF_WORD_SIZE == 32
1120         struct mod_metadata32 md32;
1121 #endif
1122         struct mod_depend *mdepend;
1123         struct mod_version mver;
1124         char *s;
1125         int error, modcnt, minfolen;
1126         Elf_Addr v, p;
1127
1128         modcnt = 0;
1129         p = p_start;
1130         while (p < p_end) {
1131                 COPYOUT(p, &v, sizeof(v));
1132                 error = __elfN(reloc_ptr)(fp, ef, p, &v, sizeof(v));
1133                 if (error == EOPNOTSUPP)
1134                         v += ef->off;
1135                 else if (error != 0)
1136                         return (error);
1137 #if (defined(__i386__) || defined(__powerpc__)) && __ELF_WORD_SIZE == 64
1138                 COPYOUT(v, &md64, sizeof(md64));
1139                 error = __elfN(reloc_ptr)(fp, ef, v, &md64, sizeof(md64));
1140                 if (error == EOPNOTSUPP) {
1141                         md64.md_cval += ef->off;
1142                         md64.md_data += ef->off;
1143                 } else if (error != 0)
1144                         return (error);
1145                 md.md_version = md64.md_version;
1146                 md.md_type = md64.md_type;
1147                 md.md_cval = (const char *)(uintptr_t)md64.md_cval;
1148                 md.md_data = (void *)(uintptr_t)md64.md_data;
1149 #elif defined(__amd64__) && __ELF_WORD_SIZE == 32
1150                 COPYOUT(v, &md32, sizeof(md32));
1151                 error = __elfN(reloc_ptr)(fp, ef, v, &md32, sizeof(md32));
1152                 if (error == EOPNOTSUPP) {
1153                         md32.md_cval += ef->off;
1154                         md32.md_data += ef->off;
1155                 } else if (error != 0)
1156                         return (error);
1157                 md.md_version = md32.md_version;
1158                 md.md_type = md32.md_type;
1159                 md.md_cval = (const char *)(uintptr_t)md32.md_cval;
1160                 md.md_data = (void *)(uintptr_t)md32.md_data;
1161 #else
1162                 COPYOUT(v, &md, sizeof(md));
1163                 error = __elfN(reloc_ptr)(fp, ef, v, &md, sizeof(md));
1164                 if (error == EOPNOTSUPP) {
1165                         md.md_cval += ef->off;
1166                         md.md_data = (void *)((uintptr_t)md.md_data +
1167                             (uintptr_t)ef->off);
1168                 } else if (error != 0)
1169                         return (error);
1170 #endif
1171                 p += sizeof(Elf_Addr);
1172                 switch(md.md_type) {
1173                 case MDT_DEPEND:
1174                         if (ef->kernel) /* kernel must not depend on anything */
1175                                 break;
1176                         s = strdupout((vm_offset_t)md.md_cval);
1177                         minfolen = sizeof(*mdepend) + strlen(s) + 1;
1178                         mdepend = malloc(minfolen);
1179                         if (mdepend == NULL)
1180                                 return ENOMEM;
1181                         COPYOUT((vm_offset_t)md.md_data, mdepend,
1182                             sizeof(*mdepend));
1183                         strcpy((char*)(mdepend + 1), s);
1184                         free(s);
1185                         file_addmetadata(fp, MODINFOMD_DEPLIST, minfolen,
1186                             mdepend);
1187                         free(mdepend);
1188                         break;
1189                 case MDT_VERSION:
1190                         s = strdupout((vm_offset_t)md.md_cval);
1191                         COPYOUT((vm_offset_t)md.md_data, &mver, sizeof(mver));
1192                         file_addmodule(fp, s, mver.mv_version, NULL);
1193                         free(s);
1194                         modcnt++;
1195                         break;
1196                 }
1197         }
1198         if (modcnt == 0) {
1199                 s = fake_modname(fp->f_name);
1200                 file_addmodule(fp, s, 1, NULL);
1201                 free(s);
1202         }
1203         return 0;
1204 }
1205
1206 static unsigned long
1207 elf_hash(const char *name)
1208 {
1209         const unsigned char *p = (const unsigned char *) name;
1210         unsigned long h = 0;
1211         unsigned long g;
1212
1213         while (*p != '\0') {
1214                 h = (h << 4) + *p++;
1215                 if ((g = h & 0xf0000000) != 0)
1216                         h ^= g >> 24;
1217                 h &= ~g;
1218         }
1219         return h;
1220 }
1221
1222 static const char __elfN(bad_symtable)[] = "elf" __XSTRING(__ELF_WORD_SIZE)
1223     "_lookup_symbol: corrupt symbol table\n";
1224 int
1225 __elfN(lookup_symbol)(elf_file_t ef, const char* name, Elf_Sym *symp,
1226     unsigned char type)
1227 {
1228         Elf_Hashelt symnum;
1229         Elf_Sym sym;
1230         char *strp;
1231         unsigned long hash;
1232
1233         if (ef->nbuckets == 0) {
1234                 printf(__elfN(bad_symtable));
1235                 return ENOENT;
1236         }
1237
1238         hash = elf_hash(name);
1239         COPYOUT(&ef->buckets[hash % ef->nbuckets], &symnum, sizeof(symnum));
1240
1241         while (symnum != STN_UNDEF) {
1242                 if (symnum >= ef->nchains) {
1243                         printf(__elfN(bad_symtable));
1244                         return ENOENT;
1245                 }
1246
1247                 COPYOUT(ef->symtab + symnum, &sym, sizeof(sym));
1248                 if (sym.st_name == 0) {
1249                         printf(__elfN(bad_symtable));
1250                         return ENOENT;
1251                 }
1252
1253                 strp = strdupout((vm_offset_t)(ef->strtab + sym.st_name));
1254                 if (strcmp(name, strp) == 0) {
1255                         free(strp);
1256                         if (sym.st_shndx != SHN_UNDEF ||
1257                             (sym.st_value != 0 &&
1258                             ELF_ST_TYPE(sym.st_info) == type)) {
1259                                 *symp = sym;
1260                                 return 0;
1261                         }
1262                         return ENOENT;
1263                 }
1264                 free(strp);
1265                 COPYOUT(&ef->chains[symnum], &symnum, sizeof(symnum));
1266         }
1267         return ENOENT;
1268 }
1269
1270 /*
1271  * Apply any intra-module relocations to the value. p is the load address
1272  * of the value and val/len is the value to be modified. This does NOT modify
1273  * the image in-place, because this is done by kern_linker later on.
1274  *
1275  * Returns EOPNOTSUPP if no relocation method is supplied.
1276  */
1277 static int
1278 __elfN(reloc_ptr)(struct preloaded_file *mp, elf_file_t ef,
1279     Elf_Addr p, void *val, size_t len)
1280 {
1281         size_t n;
1282         Elf_Rela a;
1283         Elf_Rel r;
1284         int error;
1285
1286         /*
1287          * The kernel is already relocated, but we still want to apply
1288          * offset adjustments.
1289          */
1290         if (ef->kernel)
1291                 return (EOPNOTSUPP);
1292
1293         for (n = 0; n < ef->relsz / sizeof(r); n++) {
1294                 COPYOUT(ef->rel + n, &r, sizeof(r));
1295
1296                 error = __elfN(reloc)(ef, __elfN(symaddr), &r, ELF_RELOC_REL,
1297                     ef->off, p, val, len);
1298                 if (error != 0)
1299                         return (error);
1300         }
1301         for (n = 0; n < ef->relasz / sizeof(a); n++) {
1302                 COPYOUT(ef->rela + n, &a, sizeof(a));
1303
1304                 error = __elfN(reloc)(ef, __elfN(symaddr), &a, ELF_RELOC_RELA,
1305                     ef->off, p, val, len);
1306                 if (error != 0)
1307                         return (error);
1308         }
1309
1310         return (0);
1311 }
1312
1313 static Elf_Addr
1314 __elfN(symaddr)(struct elf_file *ef, Elf_Size symidx)
1315 {
1316
1317         /* Symbol lookup by index not required here. */
1318         return (0);
1319 }