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)(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);
  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 static int
 208 __elfN(load_elf_header)(char *filename, elf_file_t ef)
 209 {
 210         ssize_t                  bytes_read;
 211         Elf_Ehdr                *ehdr;
 212         int                      err;
 213
 214         /*
 215          * Open the image, read and validate the ELF header
 216          */
 217         if (filename == NULL)   /* can't handle nameless */
 218                 return (EFTYPE);
 219         if ((ef->fd = open(filename, O_RDONLY)) == -1)
 220                 return (errno);
 221         ef->firstpage = malloc(PAGE_SIZE);
 222         if (ef->firstpage == NULL) {
 223                 close(ef->fd);
 224                 return (ENOMEM);
 225         }
 226 #ifdef LOADER_VERIEXEC_VECTX
 227         {
 228                 int verror;
 229
 230                 ef->vctx = vectx_open(ef->fd, filename, 0L, NULL, &verror, __func__);
 231                 if (verror) {
 232                         printf("Unverified %s: %s\n", filename, ve_error_get());
 233                         close(ef->fd);
 234                         free(ef->vctx);
 235                         return (EAUTH);
 236                 }
 237         }
 238 #endif
 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 */
 243                 goto error;
 244         }
 245         ehdr = ef->ehdr = (Elf_Ehdr *)ef->firstpage;
 246
 247         /* Is it ELF? */
 248         if (!IS_ELF(*ehdr)) {
 249                 err = EFTYPE;
 250                 goto error;
 251         }
 252
 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 ? */ {
 256                 err = EFTYPE;
 257                 goto error;
 258         }
 259
 260         err = elf_header_convert(ehdr);
 261         if (err)
 262                 goto error;
 263
 264         if (ehdr->e_version != EV_CURRENT || ehdr->e_machine != ELF_TARG_MACH) {
 265                 /* Machine ? */
 266                 err = EFTYPE;
 267                 goto error;
 268         }
 269
 270 #if defined(LOADER_VERIEXEC) && !defined(LOADER_VERIEXEC_VECTX)
 271         if (verify_file(ef->fd, filename, bytes_read, VE_MUST, __func__) < 0) {
 272                 err = EAUTH;
 273                 goto error;
 274         }
 275 #endif
 276         return (0);
 277
 278 error:
 279         if (ef->firstpage != NULL) {
 280                 free(ef->firstpage);
 281                 ef->firstpage = NULL;
 282         }
 283         if (ef->fd != -1) {
 284 #ifdef LOADER_VERIEXEC_VECTX
 285                 free(ef->vctx);
 286 #endif
 287                 close(ef->fd);
 288                 ef->fd = -1;
 289         }
 290         return (err);
 291 }
 292
 293 /*
 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).
 297  */
 298 int
 299 __elfN(loadfile)(char *filename, uint64_t dest, struct preloaded_file **result)
 300 {
 301         return (__elfN(loadfile_raw)(filename, dest, result, 0));
 302 }
 303
 304 int
 305 __elfN(loadfile_raw)(char *filename, uint64_t dest,
 306     struct preloaded_file **result, int multiboot)
 307 {
 308         struct preloaded_file   *fp, *kfp;
 309         struct elf_file         ef;
 310         Elf_Ehdr                *ehdr;
 311         int                     err;
 312
 313         fp = NULL;
 314         bzero(&ef, sizeof(struct elf_file));
 315         ef.fd = -1;
 316
 317         err = __elfN(load_elf_header)(filename, &ef);
 318         if (err != 0)
 319                 return (err);
 320
 321         ehdr = ef.ehdr;
 322
 323         /*
 324          * Check to see what sort of module we are.
 325          */
 326         kfp = file_findfile(NULL, __elfN(kerneltype));
 327 #ifdef __powerpc__
 328         /*
 329          * Kernels can be ET_DYN, so just assume the first loaded object is the
 330          * kernel. This assumption will be checked later.
 331          */
 332         if (kfp == NULL)
 333                 ef.kernel = 1;
 334 #endif
 335         if (ef.kernel || ehdr->e_type == ET_EXEC) {
 336                 /* Looks like a kernel */
 337                 if (kfp != NULL) {
 338                         printf("elf" __XSTRING(__ELF_WORD_SIZE)
 339                             "_loadfile: kernel already loaded\n");
 340                         err = EPERM;
 341                         goto oerr;
 342                 }
 343                 /*
 344                  * Calculate destination address based on kernel entrypoint.
 345                  *
 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.
 350                  */
 351 #ifndef __arm__
 352                 if (ehdr->e_type == ET_EXEC)
 353                         dest = (ehdr->e_entry & ~PAGE_MASK);
 354 #endif
 355                 if ((ehdr->e_entry & ~PAGE_MASK) == 0) {
 356                         printf("elf" __XSTRING(__ELF_WORD_SIZE)
 357                             "_loadfile: not a kernel (maybe static binary?)\n");
 358                         err = EPERM;
 359                         goto oerr;
 360                 }
 361                 ef.kernel = 1;
 362
 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");
 368                         err = EPERM;
 369                         goto oerr;
 370                 }
 371                 if (kfp == NULL) {
 372                         printf("elf" __XSTRING(__ELF_WORD_SIZE)
 373                             "_loadfile: can't load module before kernel\n");
 374                         err = EPERM;
 375                         goto oerr;
 376                 }
 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",
 380                             kfp->f_type);
 381                         err = EPERM;
 382                         goto oerr;
 383                 }
 384                 /* Looks OK, got ahead */
 385                 ef.kernel = 0;
 386
 387         } else {
 388                 err = EFTYPE;
 389                 goto oerr;
 390         }
 391
 392         if (archsw.arch_loadaddr != NULL)
 393                 dest = archsw.arch_loadaddr(LOAD_ELF, ehdr, dest);
 394         else
 395                 dest = roundup(dest, PAGE_SIZE);
 396
 397         /*
 398          * Ok, we think we should handle this.
 399          */
 400         fp = file_alloc();
 401         if (fp == NULL) {
 402                 printf("elf" __XSTRING(__ELF_WORD_SIZE)
 403                     "_loadfile: cannot allocate module info\n");
 404                 err = EPERM;
 405                 goto out;
 406         }
 407         if (ef.kernel == 1 && multiboot == 0)
 408                 setenv("kernelname", filename, 1);
 409         fp->f_name = strdup(filename);
 410         if (multiboot == 0)
 411                 fp->f_type = strdup(ef.kernel ?
 412                     __elfN(kerneltype) : __elfN(moduletype));
 413         else
 414                 fp->f_type = strdup("elf multiboot kernel");
 415
 416 #ifdef ELF_VERBOSE
 417         if (ef.kernel)
 418                 printf("%s entry at 0x%jx\n", filename,
 419                     (uintmax_t)ehdr->e_entry);
 420 #else
 421         printf("%s ", filename);
 422 #endif
 423
 424         fp->f_size = __elfN(loadimage)(fp, &ef, dest);
 425         if (fp->f_size == 0 || fp->f_addr == 0)
 426                 goto ioerr;
 427
 428         /* save exec header as metadata */
 429         file_addmetadata(fp, MODINFOMD_ELFHDR, sizeof(*ehdr), ehdr);
 430
 431         /* Load OK, return module pointer */
 432         *result = (struct preloaded_file *)fp;
 433         err = 0;
 434         goto out;
 435
 436 ioerr:
 437         err = EIO;
 438 oerr:
 439         file_discard(fp);
 440 out:
 441         if (ef.firstpage)
 442                 free(ef.firstpage);
 443         if (ef.fd != -1) {
 444 #ifdef LOADER_VERIEXEC_VECTX
 445                 if (!err && ef.vctx) {
 446                         int verror;
 447
 448                         verror = vectx_close(ef.vctx, VE_MUST, __func__);
 449                         if (verror) {
 450                                 err = EAUTH;
 451                                 file_discard(fp);
 452                         }
 453                 }
 454 #endif
 455                 close(ef.fd);
 456         }
 457         return (err);
 458 }
 459
 460 /*
 461  * With the file (fd) open on the image, and (ehdr) containing
 462  * the Elf header, load the image at (off)
 463  */
 464 static int
 465 __elfN(loadimage)(struct preloaded_file *fp, elf_file_t ef, uint64_t off)
 466 {
 467         int             i;
 468         u_int           j;
 469         Elf_Ehdr        *ehdr;
 470         Elf_Phdr        *phdr, *php;
 471         Elf_Shdr        *shdr;
 472         char            *shstr;
 473         int             ret;
 474         vm_offset_t     firstaddr;
 475         vm_offset_t     lastaddr;
 476         size_t          chunk;
 477         ssize_t         result;
 478         Elf_Addr        ssym, esym;
 479         Elf_Dyn         *dp;
 480         Elf_Addr        adp;
 481         Elf_Addr        ctors;
 482         int             ndp;
 483         int             symstrindex;
 484         int             symtabindex;
 485         Elf_Size        size;
 486         u_int           fpcopy;
 487         Elf_Sym         sym;
 488         Elf_Addr        p_start, p_end;
 489
 490         dp = NULL;
 491         shdr = NULL;
 492         ret = 0;
 493         firstaddr = lastaddr = 0;
 494         ehdr = ef->ehdr;
 495         if (ehdr->e_type == ET_EXEC) {
 496 #if defined(__i386__) || defined(__amd64__)
 497 #if __ELF_WORD_SIZE == 64
 498                 /* x86_64 relocates after locore */
 499                 off = - (off & 0xffffffffff000000ull);
 500 #else
 501                 /* i386 relocates after locore */
 502                 off = - (off & 0xff000000u);
 503 #endif
 504 #elif defined(__powerpc__)
 505                 /*
 506                  * On the purely virtual memory machines like e500, the kernel
 507                  * is linked against its final VA range, which is most often
 508                  * not available at the loader stage, but only after kernel
 509                  * initializes and completes its VM settings. In such cases we
 510                  * cannot use p_vaddr field directly to load ELF segments, but
 511                  * put them at some 'load-time' locations.
 512                  */
 513                 if (off & 0xf0000000u) {
 514                         off = -(off & 0xf0000000u);
 515                         /*
 516                          * XXX the physical load address should not be
 517                          * hardcoded. Note that the Book-E kernel assumes that
 518                          * it's loaded at a 16MB boundary for now...
 519                          */
 520                         off += 0x01000000;
 521                         ehdr->e_entry += off;
 522 #ifdef ELF_VERBOSE
 523                         printf("Converted entry 0x%jx\n", (uintmax_t)ehdr->e_entry);
 524 #endif
 525                 } else
 526                         off = 0;
 527 #elif defined(__arm__) && !defined(EFI)
 528                 /*
 529                  * The elf headers in arm kernels specify virtual addresses in
 530                  * all header fields, even the ones that should be physical
 531                  * addresses.  We assume the entry point is in the first page,
 532                  * and masking the page offset will leave us with the virtual
 533                  * address the kernel was linked at.  We subtract that from the
 534                  * load offset, making 'off' into the value which, when added
 535                  * to a virtual address in an elf header, translates it to a
 536                  * physical address.  We do the va->pa conversion on the entry
 537                  * point address in the header now, so that later we can launch
 538                  * the kernel by just jumping to that address.
 539                  *
 540                  * When booting from UEFI the copyin and copyout functions
 541                  * handle adjusting the location relative to the first virtual
 542                  * address.  Because of this there is no need to adjust the
 543                  * offset or entry point address as these will both be handled
 544                  * by the efi code.
 545                  */
 546                 off -= ehdr->e_entry & ~PAGE_MASK;
 547                 ehdr->e_entry += off;
 548 #ifdef ELF_VERBOSE
 549                 printf("ehdr->e_entry 0x%jx, va<->pa off %llx\n",
 550                     (uintmax_t)ehdr->e_entry, off);
 551 #endif
 552 #else
 553                 off = 0;        /* other archs use direct mapped kernels */
 554 #endif
 555         }
 556         ef->off = off;
 557
 558         if (ef->kernel)
 559                 __elfN(relocation_offset) = off;
 560
 561         if ((ehdr->e_phoff + ehdr->e_phnum * sizeof(*phdr)) > ef->firstlen) {
 562                 printf("elf" __XSTRING(__ELF_WORD_SIZE)
 563                     "_loadimage: program header not within first page\n");
 564                 goto out;
 565         }
 566         phdr = (Elf_Phdr *)(ef->firstpage + ehdr->e_phoff);
 567
 568         for (i = 0; i < ehdr->e_phnum; i++) {
 569                 if (elf_program_header_convert(ehdr, phdr))
 570                         continue;
 571
 572                 /* We want to load PT_LOAD segments only.. */
 573                 if (phdr[i].p_type != PT_LOAD)
 574                         continue;
 575
 576 #ifdef ELF_VERBOSE
 577                 printf("Segment: 0x%lx@0x%lx -> 0x%lx-0x%lx",
 578                     (long)phdr[i].p_filesz, (long)phdr[i].p_offset,
 579                     (long)(phdr[i].p_vaddr + off),
 580                     (long)(phdr[i].p_vaddr + off + phdr[i].p_memsz - 1));
 581 #else
 582                 if ((phdr[i].p_flags & PF_W) == 0) {
 583                         printf("text=0x%lx ", (long)phdr[i].p_filesz);
 584                 } else {
 585                         printf("data=0x%lx", (long)phdr[i].p_filesz);
 586                         if (phdr[i].p_filesz < phdr[i].p_memsz)
 587                                 printf("+0x%lx", (long)(phdr[i].p_memsz -
 588                                     phdr[i].p_filesz));
 589                         printf(" ");
 590                 }
 591 #endif
 592                 fpcopy = 0;
 593                 if (ef->firstlen > phdr[i].p_offset) {
 594                         fpcopy = ef->firstlen - phdr[i].p_offset;
 595                         archsw.arch_copyin(ef->firstpage + phdr[i].p_offset,
 596                             phdr[i].p_vaddr + off, fpcopy);
 597                 }
 598                 if (phdr[i].p_filesz > fpcopy) {
 599                         if (kern_pread(VECTX_HANDLE(ef),
 600                             phdr[i].p_vaddr + off + fpcopy,
 601                             phdr[i].p_filesz - fpcopy,
 602                             phdr[i].p_offset + fpcopy) != 0) {
 603                                 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
 604                                     "_loadimage: read failed\n");
 605                                 goto out;
 606                         }
 607                 }
 608                 /* clear space from oversized segments; eg: bss */
 609                 if (phdr[i].p_filesz < phdr[i].p_memsz) {
 610 #ifdef ELF_VERBOSE
 611                         printf(" (bss: 0x%lx-0x%lx)",
 612                             (long)(phdr[i].p_vaddr + off + phdr[i].p_filesz),
 613                             (long)(phdr[i].p_vaddr + off + phdr[i].p_memsz -1));
 614 #endif
 615
 616                         kern_bzero(phdr[i].p_vaddr + off + phdr[i].p_filesz,
 617                             phdr[i].p_memsz - phdr[i].p_filesz);
 618                 }
 619 #ifdef ELF_VERBOSE
 620                 printf("\n");
 621 #endif
 622
 623                 if (archsw.arch_loadseg != NULL)
 624                         archsw.arch_loadseg(ehdr, phdr + i, off);
 625
 626                 if (firstaddr == 0 || firstaddr > (phdr[i].p_vaddr + off))
 627                         firstaddr = phdr[i].p_vaddr + off;
 628                 if (lastaddr == 0 || lastaddr <
 629                     (phdr[i].p_vaddr + off + phdr[i].p_memsz))
 630                         lastaddr = phdr[i].p_vaddr + off + phdr[i].p_memsz;
 631         }
 632         lastaddr = roundup(lastaddr, sizeof(long));
 633
 634         /*
 635          * Get the section headers.  We need this for finding the .ctors
 636          * section as well as for loading any symbols.  Both may be hard
 637          * to do if reading from a .gz file as it involves seeking.  I
 638          * think the rule is going to have to be that you must strip a
 639          * file to remove symbols before gzipping it.
 640          */
 641         chunk = (size_t)ehdr->e_shnum * (size_t)ehdr->e_shentsize;
 642         if (chunk == 0 || ehdr->e_shoff == 0)
 643                 goto nosyms;
 644         shdr = alloc_pread(VECTX_HANDLE(ef), ehdr->e_shoff, chunk);
 645         if (shdr == NULL) {
 646                 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
 647                     "_loadimage: failed to read section headers");
 648                 goto nosyms;
 649         }
 650
 651         for (i = 0; i < ehdr->e_shnum; i++)
 652                 elf_section_header_convert(ehdr, &shdr[i]);
 653
 654         file_addmetadata(fp, MODINFOMD_SHDR, chunk, shdr);
 655
 656         /*
 657          * Read the section string table and look for the .ctors section.
 658          * We need to tell the kernel where it is so that it can call the
 659          * ctors.
 660          */
 661         chunk = shdr[ehdr->e_shstrndx].sh_size;
 662         if (chunk) {
 663                 shstr = alloc_pread(VECTX_HANDLE(ef),
 664                     shdr[ehdr->e_shstrndx].sh_offset, chunk);
 665                 if (shstr) {
 666                         for (i = 0; i < ehdr->e_shnum; i++) {
 667                                 if (strcmp(shstr + shdr[i].sh_name,
 668                                     ".ctors") != 0)
 669                                         continue;
 670                                 ctors = shdr[i].sh_addr;
 671                                 file_addmetadata(fp, MODINFOMD_CTORS_ADDR,
 672                                     sizeof(ctors), &ctors);
 673                                 size = shdr[i].sh_size;
 674                                 file_addmetadata(fp, MODINFOMD_CTORS_SIZE,
 675                                     sizeof(size), &size);
 676                                 break;
 677                         }
 678                         free(shstr);
 679                 }
 680         }
 681
 682         /*
 683          * Now load any symbols.
 684          */
 685         symtabindex = -1;
 686         symstrindex = -1;
 687         for (i = 0; i < ehdr->e_shnum; i++) {
 688                 if (shdr[i].sh_type != SHT_SYMTAB)
 689                         continue;
 690                 for (j = 0; j < ehdr->e_phnum; j++) {
 691                         if (phdr[j].p_type != PT_LOAD)
 692                                 continue;
 693                         if (shdr[i].sh_offset >= phdr[j].p_offset &&
 694                             (shdr[i].sh_offset + shdr[i].sh_size <=
 695                             phdr[j].p_offset + phdr[j].p_filesz)) {
 696                                 shdr[i].sh_offset = 0;
 697                                 shdr[i].sh_size = 0;
 698                                 break;
 699                         }
 700                 }
 701                 if (shdr[i].sh_offset == 0 || shdr[i].sh_size == 0)
 702                         continue;       /* alread loaded in a PT_LOAD above */
 703                 /* Save it for loading below */
 704                 symtabindex = i;
 705                 symstrindex = shdr[i].sh_link;
 706         }
 707         if (symtabindex < 0 || symstrindex < 0)
 708                 goto nosyms;
 709
 710         /* Ok, committed to a load. */
 711 #ifndef ELF_VERBOSE
 712         printf("syms=[");
 713 #endif
 714         ssym = lastaddr;
 715         for (i = symtabindex; i >= 0; i = symstrindex) {
 716 #ifdef ELF_VERBOSE
 717                 char    *secname;
 718
 719                 switch(shdr[i].sh_type) {
 720                 case SHT_SYMTAB:                /* Symbol table */
 721                         secname = "symtab";
 722                         break;
 723                 case SHT_STRTAB:                /* String table */
 724                         secname = "strtab";
 725                         break;
 726                 default:
 727                         secname = "WHOA!!";
 728                         break;
 729                 }
 730 #endif
 731                 size = shdr[i].sh_size;
 732 #if defined(__powerpc__)
 733   #if __ELF_WORD_SIZE == 64
 734                 size = htobe64(size);
 735   #else
 736                 size = htobe32(size);
 737   #endif
 738 #endif
 739
 740                 archsw.arch_copyin(&size, lastaddr, sizeof(size));
 741                 lastaddr += sizeof(size);
 742
 743 #ifdef ELF_VERBOSE
 744                 printf("\n%s: 0x%jx@0x%jx -> 0x%jx-0x%jx", secname,
 745                     (uintmax_t)shdr[i].sh_size, (uintmax_t)shdr[i].sh_offset,
 746                     (uintmax_t)lastaddr,
 747                     (uintmax_t)(lastaddr + shdr[i].sh_size));
 748 #else
 749                 if (i == symstrindex)
 750                         printf("+");
 751                 printf("0x%lx+0x%lx", (long)sizeof(size), (long)size);
 752 #endif
 753
 754                 if (VECTX_LSEEK(VECTX_HANDLE(ef), (off_t)shdr[i].sh_offset, SEEK_SET) == -1) {
 755                         printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
 756                            "_loadimage: could not seek for symbols - skipped!");
 757                         lastaddr = ssym;
 758                         ssym = 0;
 759                         goto nosyms;
 760                 }
 761                 result = archsw.arch_readin(VECTX_HANDLE(ef), lastaddr, shdr[i].sh_size);
 762                 if (result < 0 || (size_t)result != shdr[i].sh_size) {
 763                         printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
 764                             "_loadimage: could not read symbols - skipped! "
 765                             "(%ju != %ju)", (uintmax_t)result,
 766                             (uintmax_t)shdr[i].sh_size);
 767                         lastaddr = ssym;
 768                         ssym = 0;
 769                         goto nosyms;
 770                 }
 771                 /* Reset offsets relative to ssym */
 772                 lastaddr += shdr[i].sh_size;
 773                 lastaddr = roundup(lastaddr, sizeof(size));
 774                 if (i == symtabindex)
 775                         symtabindex = -1;
 776                 else if (i == symstrindex)
 777                         symstrindex = -1;
 778         }
 779         esym = lastaddr;
 780 #ifndef ELF_VERBOSE
 781         printf("]");
 782 #endif
 783
 784 #if defined(__powerpc__)
 785   /* On PowerPC we always need to provide BE data to the kernel */
 786   #if __ELF_WORD_SIZE == 64
 787         ssym = htobe64((uint64_t)ssym);
 788         esym = htobe64((uint64_t)esym);
 789   #else
 790         ssym = htobe32((uint32_t)ssym);
 791         esym = htobe32((uint32_t)esym);
 792   #endif
 793 #endif
 794
 795         file_addmetadata(fp, MODINFOMD_SSYM, sizeof(ssym), &ssym);
 796         file_addmetadata(fp, MODINFOMD_ESYM, sizeof(esym), &esym);
 797
 798 nosyms:
 799         printf("\n");
 800
 801         ret = lastaddr - firstaddr;
 802         fp->f_addr = firstaddr;
 803
 804         php = NULL;
 805         for (i = 0; i < ehdr->e_phnum; i++) {
 806                 if (phdr[i].p_type == PT_DYNAMIC) {
 807                         php = phdr + i;
 808                         adp = php->p_vaddr;
 809                         file_addmetadata(fp, MODINFOMD_DYNAMIC, sizeof(adp),
 810                             &adp);
 811                         break;
 812                 }
 813         }
 814
 815         if (php == NULL) /* this is bad, we cannot get to symbols or _DYNAMIC */
 816                 goto out;
 817
 818         ndp = php->p_filesz / sizeof(Elf_Dyn);
 819         if (ndp == 0)
 820                 goto out;
 821         dp = malloc(php->p_filesz);
 822         if (dp == NULL)
 823                 goto out;
 824         archsw.arch_copyout(php->p_vaddr + off, dp, php->p_filesz);
 825
 826         ef->strsz = 0;
 827         for (i = 0; i < ndp; i++) {
 828                 if (dp[i].d_tag == 0)
 829                         break;
 830                 switch (dp[i].d_tag) {
 831                 case DT_HASH:
 832                         ef->hashtab =
 833                             (Elf_Hashelt*)(uintptr_t)(dp[i].d_un.d_ptr + off);
 834                         break;
 835                 case DT_STRTAB:
 836                         ef->strtab =
 837                             (char *)(uintptr_t)(dp[i].d_un.d_ptr + off);
 838                         break;
 839                 case DT_STRSZ:
 840                         ef->strsz = dp[i].d_un.d_val;
 841                         break;
 842                 case DT_SYMTAB:
 843                         ef->symtab =
 844                             (Elf_Sym *)(uintptr_t)(dp[i].d_un.d_ptr + off);
 845                         break;
 846                 case DT_REL:
 847                         ef->rel =
 848                             (Elf_Rel *)(uintptr_t)(dp[i].d_un.d_ptr + off);
 849                         break;
 850                 case DT_RELSZ:
 851                         ef->relsz = dp[i].d_un.d_val;
 852                         break;
 853                 case DT_RELA:
 854                         ef->rela =
 855                             (Elf_Rela *)(uintptr_t)(dp[i].d_un.d_ptr + off);
 856                         break;
 857                 case DT_RELASZ:
 858                         ef->relasz = dp[i].d_un.d_val;
 859                         break;
 860                 default:
 861                         break;
 862                 }
 863         }
 864         if (ef->hashtab == NULL || ef->symtab == NULL ||
 865             ef->strtab == NULL || ef->strsz == 0)
 866                 goto out;
 867         COPYOUT(ef->hashtab, &ef->nbuckets, sizeof(ef->nbuckets));
 868         COPYOUT(ef->hashtab + 1, &ef->nchains, sizeof(ef->nchains));
 869         ef->buckets = ef->hashtab + 2;
 870         ef->chains = ef->buckets + ef->nbuckets;
 871
 872         if (__elfN(lookup_symbol)(fp, ef, "__start_set_modmetadata_set",
 873             &sym) != 0)
 874                 return 0;
 875         p_start = sym.st_value + ef->off;
 876         if (__elfN(lookup_symbol)(fp, ef, "__stop_set_modmetadata_set",
 877             &sym) != 0)
 878                 return 0;
 879         p_end = sym.st_value + ef->off;
 880
 881         if (__elfN(parse_modmetadata)(fp, ef, p_start, p_end) == 0)
 882                 goto out;
 883
 884         if (ef->kernel)         /* kernel must not depend on anything */
 885                 goto out;
 886
 887 out:
 888         if (dp)
 889                 free(dp);
 890         if (shdr)
 891                 free(shdr);
 892         return ret;
 893 }
 894
 895 static char invalid_name[] = "bad";
 896
 897 char *
 898 fake_modname(const char *name)
 899 {
 900         const char *sp, *ep;
 901         char *fp;
 902         size_t len;
 903
 904         sp = strrchr(name, '/');
 905         if (sp)
 906                 sp++;
 907         else
 908                 sp = name;
 909
 910         ep = strrchr(sp, '.');
 911         if (ep == NULL) {
 912                 ep = sp + strlen(sp);
 913         }
 914         if (ep == sp) {
 915                 sp = invalid_name;
 916                 ep = invalid_name + sizeof(invalid_name) - 1;
 917         }
 918
 919         len = ep - sp;
 920         fp = malloc(len + 1);
 921         if (fp == NULL)
 922                 return NULL;
 923         memcpy(fp, sp, len);
 924         fp[len] = '\0';
 925         return fp;
 926 }
 927
 928 #if (defined(__i386__) || defined(__powerpc__)) && __ELF_WORD_SIZE == 64
 929 struct mod_metadata64 {
 930         int             md_version;     /* structure version MDTV_* */
 931         int             md_type;        /* type of entry MDT_* */
 932         uint64_t        md_data;        /* specific data */
 933         uint64_t        md_cval;        /* common string label */
 934 };
 935 #endif
 936 #if defined(__amd64__) && __ELF_WORD_SIZE == 32
 937 struct mod_metadata32 {
 938         int             md_version;     /* structure version MDTV_* */
 939         int             md_type;        /* type of entry MDT_* */
 940         uint32_t        md_data;        /* specific data */
 941         uint32_t        md_cval;        /* common string label */
 942 };
 943 #endif
 944
 945 int
 946 __elfN(load_modmetadata)(struct preloaded_file *fp, uint64_t dest)
 947 {
 948         struct elf_file          ef;
 949         int                      err, i, j;
 950         Elf_Shdr                *sh_meta, *shdr = NULL;
 951         Elf_Shdr                *sh_data[2];
 952         char                    *shstrtab = NULL;
 953         size_t                   size;
 954         Elf_Addr                 p_start, p_end;
 955
 956         bzero(&ef, sizeof(struct elf_file));
 957         ef.fd = -1;
 958
 959         err = __elfN(load_elf_header)(fp->f_name, &ef);
 960         if (err != 0)
 961                 goto out;
 962
 963         if (ef.kernel == 1 || ef.ehdr->e_type == ET_EXEC) {
 964                 ef.kernel = 1;
 965         } else if (ef.ehdr->e_type != ET_DYN) {
 966                 err = EFTYPE;
 967                 goto out;
 968         }
 969
 970         size = (size_t)ef.ehdr->e_shnum * (size_t)ef.ehdr->e_shentsize;
 971         shdr = alloc_pread(VECTX_HANDLE(&ef), ef.ehdr->e_shoff, size);
 972         if (shdr == NULL) {
 973                 err = ENOMEM;
 974                 goto out;
 975         }
 976
 977         /* Load shstrtab. */
 978         shstrtab = alloc_pread(VECTX_HANDLE(&ef), shdr[ef.ehdr->e_shstrndx].sh_offset,
 979             shdr[ef.ehdr->e_shstrndx].sh_size);
 980         if (shstrtab == NULL) {
 981                 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
 982                     "load_modmetadata: unable to load shstrtab\n");
 983                 err = EFTYPE;
 984                 goto out;
 985         }
 986
 987         /* Find set_modmetadata_set and data sections. */
 988         sh_data[0] = sh_data[1] = sh_meta = NULL;
 989         for (i = 0, j = 0; i < ef.ehdr->e_shnum; i++) {
 990                 if (strcmp(&shstrtab[shdr[i].sh_name],
 991                     "set_modmetadata_set") == 0) {
 992                         sh_meta = &shdr[i];
 993                 }
 994                 if ((strcmp(&shstrtab[shdr[i].sh_name], ".data") == 0) ||
 995                     (strcmp(&shstrtab[shdr[i].sh_name], ".rodata") == 0)) {
 996                         sh_data[j++] = &shdr[i];
 997                 }
 998         }
 999         if (sh_meta == NULL || sh_data[0] == NULL || sh_data[1] == NULL) {
1000                 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
1001     "load_modmetadata: unable to find set_modmetadata_set or data sections\n");
1002                 err = EFTYPE;
1003                 goto out;
1004         }
1005
1006         /* Load set_modmetadata_set into memory */
1007         err = kern_pread(VECTX_HANDLE(&ef), dest, sh_meta->sh_size, sh_meta->sh_offset);
1008         if (err != 0) {
1009                 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
1010     "load_modmetadata: unable to load set_modmetadata_set: %d\n", err);
1011                 goto out;
1012         }
1013         p_start = dest;
1014         p_end = dest + sh_meta->sh_size;
1015         dest += sh_meta->sh_size;
1016
1017         /* Load data sections into memory. */
1018         err = kern_pread(VECTX_HANDLE(&ef), dest, sh_data[0]->sh_size,
1019             sh_data[0]->sh_offset);
1020         if (err != 0) {
1021                 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
1022                     "load_modmetadata: unable to load data: %d\n", err);
1023                 goto out;
1024         }
1025
1026         /*
1027          * We have to increment the dest, so that the offset is the same into
1028          * both the .rodata and .data sections.
1029          */
1030         ef.off = -(sh_data[0]->sh_addr - dest);
1031         dest += (sh_data[1]->sh_addr - sh_data[0]->sh_addr);
1032
1033         err = kern_pread(VECTX_HANDLE(&ef), dest, sh_data[1]->sh_size,
1034             sh_data[1]->sh_offset);
1035         if (err != 0) {
1036                 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
1037                     "load_modmetadata: unable to load data: %d\n", err);
1038                 goto out;
1039         }
1040
1041         err = __elfN(parse_modmetadata)(fp, &ef, p_start, p_end);
1042         if (err != 0) {
1043                 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
1044                     "load_modmetadata: unable to parse metadata: %d\n", err);
1045                 goto out;
1046         }
1047
1048 out:
1049         if (shstrtab != NULL)
1050                 free(shstrtab);
1051         if (shdr != NULL)
1052                 free(shdr);
1053         if (ef.firstpage != NULL)
1054                 free(ef.firstpage);
1055         if (ef.fd != -1) {
1056 #ifdef LOADER_VERIEXEC_VECTX
1057                 if (!err && ef.vctx) {
1058                         int verror;
1059
1060                         verror = vectx_close(ef.vctx, VE_MUST, __func__);
1061                         if (verror) {
1062                                 err = EAUTH;
1063                                 file_discard(fp);
1064                         }
1065                 }
1066 #endif
1067                 close(ef.fd);
1068         }
1069         return (err);
1070 }
1071
1072 int
1073 __elfN(parse_modmetadata)(struct preloaded_file *fp, elf_file_t ef,
1074     Elf_Addr p_start, Elf_Addr p_end)
1075 {
1076         struct mod_metadata md;
1077 #if (defined(__i386__) || defined(__powerpc__)) && __ELF_WORD_SIZE == 64
1078         struct mod_metadata64 md64;
1079 #elif defined(__amd64__) && __ELF_WORD_SIZE == 32
1080         struct mod_metadata32 md32;
1081 #endif
1082         struct mod_depend *mdepend;
1083         struct mod_version mver;
1084         char *s;
1085         int error, modcnt, minfolen;
1086         Elf_Addr v, p;
1087
1088         modcnt = 0;
1089         p = p_start;
1090         while (p < p_end) {
1091                 COPYOUT(p, &v, sizeof(v));
1092                 error = __elfN(reloc_ptr)(fp, ef, p, &v, sizeof(v));
1093                 if (error == EOPNOTSUPP)
1094                         v += ef->off;
1095                 else if (error != 0)
1096                         return (error);
1097 #if (defined(__i386__) || defined(__powerpc__)) && __ELF_WORD_SIZE == 64
1098                 COPYOUT(v, &md64, sizeof(md64));
1099                 error = __elfN(reloc_ptr)(fp, ef, v, &md64, sizeof(md64));
1100                 if (error == EOPNOTSUPP) {
1101                         md64.md_cval += ef->off;
1102                         md64.md_data += ef->off;
1103                 } else if (error != 0)
1104                         return (error);
1105                 md.md_version = md64.md_version;
1106                 md.md_type = md64.md_type;
1107                 md.md_cval = (const char *)(uintptr_t)md64.md_cval;
1108                 md.md_data = (void *)(uintptr_t)md64.md_data;
1109 #elif defined(__amd64__) && __ELF_WORD_SIZE == 32
1110                 COPYOUT(v, &md32, sizeof(md32));
1111                 error = __elfN(reloc_ptr)(fp, ef, v, &md32, sizeof(md32));
1112                 if (error == EOPNOTSUPP) {
1113                         md32.md_cval += ef->off;
1114                         md32.md_data += ef->off;
1115                 } else if (error != 0)
1116                         return (error);
1117                 md.md_version = md32.md_version;
1118                 md.md_type = md32.md_type;
1119                 md.md_cval = (const char *)(uintptr_t)md32.md_cval;
1120                 md.md_data = (void *)(uintptr_t)md32.md_data;
1121 #else
1122                 COPYOUT(v, &md, sizeof(md));
1123                 error = __elfN(reloc_ptr)(fp, ef, v, &md, sizeof(md));
1124                 if (error == EOPNOTSUPP) {
1125                         md.md_cval += ef->off;
1126                         md.md_data = (void *)((uintptr_t)md.md_data +
1127                             (uintptr_t)ef->off);
1128                 } else if (error != 0)
1129                         return (error);
1130 #endif
1131                 p += sizeof(Elf_Addr);
1132                 switch(md.md_type) {
1133                 case MDT_DEPEND:
1134                         if (ef->kernel) /* kernel must not depend on anything */
1135                                 break;
1136                         s = strdupout((vm_offset_t)md.md_cval);
1137                         minfolen = sizeof(*mdepend) + strlen(s) + 1;
1138                         mdepend = malloc(minfolen);
1139                         if (mdepend == NULL)
1140                                 return ENOMEM;
1141                         COPYOUT((vm_offset_t)md.md_data, mdepend,
1142                             sizeof(*mdepend));
1143                         strcpy((char*)(mdepend + 1), s);
1144                         free(s);
1145                         file_addmetadata(fp, MODINFOMD_DEPLIST, minfolen,
1146                             mdepend);
1147                         free(mdepend);
1148                         break;
1149                 case MDT_VERSION:
1150                         s = strdupout((vm_offset_t)md.md_cval);
1151                         COPYOUT((vm_offset_t)md.md_data, &mver, sizeof(mver));
1152                         file_addmodule(fp, s, mver.mv_version, NULL);
1153                         free(s);
1154                         modcnt++;
1155                         break;
1156                 }
1157         }
1158         if (modcnt == 0) {
1159                 s = fake_modname(fp->f_name);
1160                 file_addmodule(fp, s, 1, NULL);
1161                 free(s);
1162         }
1163         return 0;
1164 }
1165
1166 static unsigned long
1167 elf_hash(const char *name)
1168 {
1169         const unsigned char *p = (const unsigned char *) name;
1170         unsigned long h = 0;
1171         unsigned long g;
1172
1173         while (*p != '\0') {
1174                 h = (h << 4) + *p++;
1175                 if ((g = h & 0xf0000000) != 0)
1176                         h ^= g >> 24;
1177                 h &= ~g;
1178         }
1179         return h;
1180 }
1181
1182 static const char __elfN(bad_symtable)[] = "elf" __XSTRING(__ELF_WORD_SIZE)
1183     "_lookup_symbol: corrupt symbol table\n";
1184 int
1185 __elfN(lookup_symbol)(struct preloaded_file *fp, elf_file_t ef,
1186     const char* name, Elf_Sym *symp)
1187 {
1188         Elf_Hashelt symnum;
1189         Elf_Sym sym;
1190         char *strp;
1191         unsigned long hash;
1192
1193         hash = elf_hash(name);
1194         COPYOUT(&ef->buckets[hash % ef->nbuckets], &symnum, sizeof(symnum));
1195
1196         while (symnum != STN_UNDEF) {
1197                 if (symnum >= ef->nchains) {
1198                         printf(__elfN(bad_symtable));
1199                         return ENOENT;
1200                 }
1201
1202                 COPYOUT(ef->symtab + symnum, &sym, sizeof(sym));
1203                 if (sym.st_name == 0) {
1204                         printf(__elfN(bad_symtable));
1205                         return ENOENT;
1206                 }
1207
1208                 strp = strdupout((vm_offset_t)(ef->strtab + sym.st_name));
1209                 if (strcmp(name, strp) == 0) {
1210                         free(strp);
1211                         if (sym.st_shndx != SHN_UNDEF ||
1212                             (sym.st_value != 0 &&
1213                             ELF_ST_TYPE(sym.st_info) == STT_FUNC)) {
1214                                 *symp = sym;
1215                                 return 0;
1216                         }
1217                         return ENOENT;
1218                 }
1219                 free(strp);
1220                 COPYOUT(&ef->chains[symnum], &symnum, sizeof(symnum));
1221         }
1222         return ENOENT;
1223 }
1224
1225 /*
1226  * Apply any intra-module relocations to the value. p is the load address
1227  * of the value and val/len is the value to be modified. This does NOT modify
1228  * the image in-place, because this is done by kern_linker later on.
1229  *
1230  * Returns EOPNOTSUPP if no relocation method is supplied.
1231  */
1232 static int
1233 __elfN(reloc_ptr)(struct preloaded_file *mp, elf_file_t ef,
1234     Elf_Addr p, void *val, size_t len)
1235 {
1236         size_t n;
1237         Elf_Rela a;
1238         Elf_Rel r;
1239         int error;
1240
1241         /*
1242          * The kernel is already relocated, but we still want to apply
1243          * offset adjustments.
1244          */
1245         if (ef->kernel)
1246                 return (EOPNOTSUPP);
1247
1248         for (n = 0; n < ef->relsz / sizeof(r); n++) {
1249                 COPYOUT(ef->rel + n, &r, sizeof(r));
1250
1251                 error = __elfN(reloc)(ef, __elfN(symaddr), &r, ELF_RELOC_REL,
1252                     ef->off, p, val, len);
1253                 if (error != 0)
1254                         return (error);
1255         }
1256         for (n = 0; n < ef->relasz / sizeof(a); n++) {
1257                 COPYOUT(ef->rela + n, &a, sizeof(a));
1258
1259                 error = __elfN(reloc)(ef, __elfN(symaddr), &a, ELF_RELOC_RELA,
1260                     ef->off, p, val, len);
1261                 if (error != 0)
1262                         return (error);
1263         }
1264
1265         return (0);
1266 }
1267
1268 static Elf_Addr
1269 __elfN(symaddr)(struct elf_file *ef, Elf_Size symidx)
1270 {
1271
1272         /* Symbol lookup by index not required here. */
1273         return (0);
1274 }