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 } *elf_file_t;
  75
  76 static int __elfN(loadimage)(struct preloaded_file *mp, elf_file_t ef,
  77     uint64_t loadaddr);
  78 static int __elfN(lookup_symbol)(struct preloaded_file *mp, elf_file_t ef,
  79     const char* name, Elf_Sym* sym);
  80 static int __elfN(reloc_ptr)(struct preloaded_file *mp, elf_file_t ef,
  81     Elf_Addr p, void *val, size_t len);
  82 static int __elfN(parse_modmetadata)(struct preloaded_file *mp, elf_file_t ef,
  83     Elf_Addr p_start, Elf_Addr p_end);
  84 static symaddr_fn __elfN(symaddr);
  85 static char     *fake_modname(const char *name);
  86
  87 const char      *__elfN(kerneltype) = "elf kernel";
  88 const char      *__elfN(moduletype) = "elf module";
  89
  90 uint64_t        __elfN(relocation_offset) = 0;
  91
  92 extern void elf_wrong_field_size(void);
  93 #define CONVERT_FIELD(b, f, e)                  \
  94         switch (sizeof((b)->f)) {               \
  95         case 2:                                 \
  96                 (b)->f = e ## 16toh((b)->f);    \
  97                 break;                          \
  98         case 4:                                 \
  99                 (b)->f = e ## 32toh((b)->f);    \
 100                 break;                          \
 101         case 8:                                 \
 102                 (b)->f = e ## 64toh((b)->f);    \
 103                 break;                          \
 104         default:                                \
 105                 /* Force a link time error. */  \
 106                 elf_wrong_field_size();         \
 107                 break;                          \
 108         }
 109
 110 #define CONVERT_SWITCH(h, d, f)                 \
 111         switch ((h)->e_ident[EI_DATA]) {        \
 112         case ELFDATA2MSB:                       \
 113                 f(d, be);                       \
 114                 break;                          \
 115         case ELFDATA2LSB:                       \
 116                 f(d, le);                       \
 117                 break;                          \
 118         default:                                \
 119                 return (EINVAL);                \
 120         }
 121
 122
 123 static int elf_header_convert(Elf_Ehdr *ehdr)
 124 {
 125         /*
 126          * Fixup ELF header endianness.
 127          *
 128          * The Xhdr structure was loaded using block read call to optimize file
 129          * accesses. It might happen, that the endianness of the system memory
 130          * is different that endianness of the ELF header.  Swap fields here to
 131          * guarantee that Xhdr always contain valid data regardless of
 132          * architecture.
 133          */
 134 #define HEADER_FIELDS(b, e)                     \
 135         CONVERT_FIELD(b, e_type, e);            \
 136         CONVERT_FIELD(b, e_machine, e);         \
 137         CONVERT_FIELD(b, e_version, e);         \
 138         CONVERT_FIELD(b, e_entry, e);           \
 139         CONVERT_FIELD(b, e_phoff, e);           \
 140         CONVERT_FIELD(b, e_shoff, e);           \
 141         CONVERT_FIELD(b, e_flags, e);           \
 142         CONVERT_FIELD(b, e_ehsize, e);          \
 143         CONVERT_FIELD(b, e_phentsize, e);       \
 144         CONVERT_FIELD(b, e_phnum, e);           \
 145         CONVERT_FIELD(b, e_shentsize, e);       \
 146         CONVERT_FIELD(b, e_shnum, e);           \
 147         CONVERT_FIELD(b, e_shstrndx, e)
 148
 149         CONVERT_SWITCH(ehdr, ehdr, HEADER_FIELDS);
 150
 151 #undef HEADER_FIELDS
 152
 153         return (0);
 154 }
 155
 156 static int elf_program_header_convert(const Elf_Ehdr *ehdr, Elf_Phdr *phdr)
 157 {
 158 #define PROGRAM_HEADER_FIELDS(b, e)             \
 159         CONVERT_FIELD(b, p_type, e);            \
 160         CONVERT_FIELD(b, p_flags, e);           \
 161         CONVERT_FIELD(b, p_offset, e);          \
 162         CONVERT_FIELD(b, p_vaddr, e);           \
 163         CONVERT_FIELD(b, p_paddr, e);           \
 164         CONVERT_FIELD(b, p_filesz, e);          \
 165         CONVERT_FIELD(b, p_memsz, e);           \
 166         CONVERT_FIELD(b, p_align, e)
 167
 168         CONVERT_SWITCH(ehdr, phdr, PROGRAM_HEADER_FIELDS);
 169
 170 #undef PROGRAM_HEADER_FIELDS
 171
 172         return (0);
 173 }
 174
 175 static int elf_section_header_convert(const Elf_Ehdr *ehdr, Elf_Shdr *shdr)
 176 {
 177 #define SECTION_HEADER_FIELDS(b, e)             \
 178         CONVERT_FIELD(b, sh_name, e);           \
 179         CONVERT_FIELD(b, sh_type, e);           \
 180         CONVERT_FIELD(b, sh_link, e);           \
 181         CONVERT_FIELD(b, sh_info, e);           \
 182         CONVERT_FIELD(b, sh_flags, e);          \
 183         CONVERT_FIELD(b, sh_addr, e);           \
 184         CONVERT_FIELD(b, sh_offset, e);         \
 185         CONVERT_FIELD(b, sh_size, e);           \
 186         CONVERT_FIELD(b, sh_addralign, e);      \
 187         CONVERT_FIELD(b, sh_entsize, e)
 188
 189         CONVERT_SWITCH(ehdr, shdr, SECTION_HEADER_FIELDS);
 190
 191 #undef SECTION_HEADER_FIELDS
 192
 193         return (0);
 194 }
 195 #undef CONVERT_SWITCH
 196 #undef CONVERT_FIELD
 197
 198 static int
 199 __elfN(load_elf_header)(char *filename, elf_file_t ef)
 200 {
 201         ssize_t                  bytes_read;
 202         Elf_Ehdr                *ehdr;
 203         int                      err;
 204
 205         /*
 206          * Open the image, read and validate the ELF header
 207          */
 208         if (filename == NULL)   /* can't handle nameless */
 209                 return (EFTYPE);
 210         if ((ef->fd = open(filename, O_RDONLY)) == -1)
 211                 return (errno);
 212         ef->firstpage = malloc(PAGE_SIZE);
 213         if (ef->firstpage == NULL) {
 214                 close(ef->fd);
 215                 return (ENOMEM);
 216         }
 217         bytes_read = read(ef->fd, ef->firstpage, PAGE_SIZE);
 218         ef->firstlen = (size_t)bytes_read;
 219         if (bytes_read < 0 || ef->firstlen <= sizeof(Elf_Ehdr)) {
 220                 err = EFTYPE; /* could be EIO, but may be small file */
 221                 goto error;
 222         }
 223         ehdr = ef->ehdr = (Elf_Ehdr *)ef->firstpage;
 224
 225         /* Is it ELF? */
 226         if (!IS_ELF(*ehdr)) {
 227                 err = EFTYPE;
 228                 goto error;
 229         }
 230
 231         if (ehdr->e_ident[EI_CLASS] != ELF_TARG_CLASS || /* Layout ? */
 232             ehdr->e_ident[EI_DATA] != ELF_TARG_DATA ||
 233             ehdr->e_ident[EI_VERSION] != EV_CURRENT) /* Version ? */ {
 234                 err = EFTYPE;
 235                 goto error;
 236         }
 237
 238         err = elf_header_convert(ehdr);
 239         if (err)
 240                 goto error;
 241
 242         if (ehdr->e_version != EV_CURRENT || ehdr->e_machine != ELF_TARG_MACH) {
 243                 /* Machine ? */
 244                 err = EFTYPE;
 245                 goto error;
 246         }
 247
 248 #ifdef LOADER_VERIEXEC
 249         if (verify_file(ef->fd, filename, bytes_read, VE_MUST) < 0) {
 250             err = EAUTH;
 251             goto error;
 252         }
 253 #endif
 254         return (0);
 255
 256 error:
 257         if (ef->firstpage != NULL) {
 258                 free(ef->firstpage);
 259                 ef->firstpage = NULL;
 260         }
 261         if (ef->fd != -1) {
 262                 close(ef->fd);
 263                 ef->fd = -1;
 264         }
 265         return (err);
 266 }
 267
 268 /*
 269  * Attempt to load the file (file) as an ELF module.  It will be stored at
 270  * (dest), and a pointer to a module structure describing the loaded object
 271  * will be saved in (result).
 272  */
 273 int
 274 __elfN(loadfile)(char *filename, uint64_t dest, struct preloaded_file **result)
 275 {
 276         return (__elfN(loadfile_raw)(filename, dest, result, 0));
 277 }
 278
 279 int
 280 __elfN(loadfile_raw)(char *filename, uint64_t dest,
 281     struct preloaded_file **result, int multiboot)
 282 {
 283         struct preloaded_file   *fp, *kfp;
 284         struct elf_file         ef;
 285         Elf_Ehdr                *ehdr;
 286         int                     err;
 287
 288         fp = NULL;
 289         bzero(&ef, sizeof(struct elf_file));
 290         ef.fd = -1;
 291
 292         err = __elfN(load_elf_header)(filename, &ef);
 293         if (err != 0)
 294                 return (err);
 295
 296         ehdr = ef.ehdr;
 297
 298         /*
 299          * Check to see what sort of module we are.
 300          */
 301         kfp = file_findfile(NULL, __elfN(kerneltype));
 302 #ifdef __powerpc__
 303         /*
 304          * Kernels can be ET_DYN, so just assume the first loaded object is the
 305          * kernel. This assumption will be checked later.
 306          */
 307         if (kfp == NULL)
 308                 ef.kernel = 1;
 309 #endif
 310         if (ef.kernel || ehdr->e_type == ET_EXEC) {
 311                 /* Looks like a kernel */
 312                 if (kfp != NULL) {
 313                         printf("elf" __XSTRING(__ELF_WORD_SIZE)
 314                             "_loadfile: kernel already loaded\n");
 315                         err = EPERM;
 316                         goto oerr;
 317                 }
 318                 /*
 319                  * Calculate destination address based on kernel entrypoint.
 320                  *
 321                  * For ARM, the destination address is independent of any values
 322                  * in the elf header (an ARM kernel can be loaded at any 2MB
 323                  * boundary), so we leave dest set to the value calculated by
 324                  * archsw.arch_loadaddr() and passed in to this function.
 325                  */
 326 #ifndef __arm__
 327                 if (ehdr->e_type == ET_EXEC)
 328                         dest = (ehdr->e_entry & ~PAGE_MASK);
 329 #endif
 330                 if ((ehdr->e_entry & ~PAGE_MASK) == 0) {
 331                         printf("elf" __XSTRING(__ELF_WORD_SIZE)
 332                             "_loadfile: not a kernel (maybe static binary?)\n");
 333                         err = EPERM;
 334                         goto oerr;
 335                 }
 336                 ef.kernel = 1;
 337
 338         } else if (ehdr->e_type == ET_DYN) {
 339                 /* Looks like a kld module */
 340                 if (multiboot != 0) {
 341                         printf("elf" __XSTRING(__ELF_WORD_SIZE)
 342                             "_loadfile: can't load module as multiboot\n");
 343                         err = EPERM;
 344                         goto oerr;
 345                 }
 346                 if (kfp == NULL) {
 347                         printf("elf" __XSTRING(__ELF_WORD_SIZE)
 348                             "_loadfile: can't load module before kernel\n");
 349                         err = EPERM;
 350                         goto oerr;
 351                 }
 352                 if (strcmp(__elfN(kerneltype), kfp->f_type)) {
 353                         printf("elf" __XSTRING(__ELF_WORD_SIZE)
 354                          "_loadfile: can't load module with kernel type '%s'\n",
 355                             kfp->f_type);
 356                         err = EPERM;
 357                         goto oerr;
 358                 }
 359                 /* Looks OK, got ahead */
 360                 ef.kernel = 0;
 361
 362         } else {
 363                 err = EFTYPE;
 364                 goto oerr;
 365         }
 366
 367         if (archsw.arch_loadaddr != NULL)
 368                 dest = archsw.arch_loadaddr(LOAD_ELF, ehdr, dest);
 369         else
 370                 dest = roundup(dest, PAGE_SIZE);
 371
 372         /*
 373          * Ok, we think we should handle this.
 374          */
 375         fp = file_alloc();
 376         if (fp == NULL) {
 377                 printf("elf" __XSTRING(__ELF_WORD_SIZE)
 378                     "_loadfile: cannot allocate module info\n");
 379                 err = EPERM;
 380                 goto out;
 381         }
 382         if (ef.kernel == 1 && multiboot == 0)
 383                 setenv("kernelname", filename, 1);
 384         fp->f_name = strdup(filename);
 385         if (multiboot == 0)
 386                 fp->f_type = strdup(ef.kernel ?
 387                     __elfN(kerneltype) : __elfN(moduletype));
 388         else
 389                 fp->f_type = strdup("elf multiboot kernel");
 390
 391 #ifdef ELF_VERBOSE
 392         if (ef.kernel)
 393                 printf("%s entry at 0x%jx\n", filename,
 394                     (uintmax_t)ehdr->e_entry);
 395 #else
 396         printf("%s ", filename);
 397 #endif
 398
 399         fp->f_size = __elfN(loadimage)(fp, &ef, dest);
 400         if (fp->f_size == 0 || fp->f_addr == 0)
 401                 goto ioerr;
 402
 403         /* save exec header as metadata */
 404         file_addmetadata(fp, MODINFOMD_ELFHDR, sizeof(*ehdr), ehdr);
 405
 406         /* Load OK, return module pointer */
 407         *result = (struct preloaded_file *)fp;
 408         err = 0;
 409         goto out;
 410
 411 ioerr:
 412         err = EIO;
 413 oerr:
 414         file_discard(fp);
 415 out:
 416         if (ef.firstpage)
 417                 free(ef.firstpage);
 418         if (ef.fd != -1)
 419                 close(ef.fd);
 420         return (err);
 421 }
 422
 423 /*
 424  * With the file (fd) open on the image, and (ehdr) containing
 425  * the Elf header, load the image at (off)
 426  */
 427 static int
 428 __elfN(loadimage)(struct preloaded_file *fp, elf_file_t ef, uint64_t off)
 429 {
 430         int             i;
 431         u_int           j;
 432         Elf_Ehdr        *ehdr;
 433         Elf_Phdr        *phdr, *php;
 434         Elf_Shdr        *shdr;
 435         char            *shstr;
 436         int             ret;
 437         vm_offset_t     firstaddr;
 438         vm_offset_t     lastaddr;
 439         size_t          chunk;
 440         ssize_t         result;
 441         Elf_Addr        ssym, esym;
 442         Elf_Dyn         *dp;
 443         Elf_Addr        adp;
 444         Elf_Addr        ctors;
 445         int             ndp;
 446         int             symstrindex;
 447         int             symtabindex;
 448         Elf_Size        size;
 449         u_int           fpcopy;
 450         Elf_Sym         sym;
 451         Elf_Addr        p_start, p_end;
 452
 453         dp = NULL;
 454         shdr = NULL;
 455         ret = 0;
 456         firstaddr = lastaddr = 0;
 457         ehdr = ef->ehdr;
 458 #ifdef __powerpc__
 459         if (ef->kernel) {
 460 #else
 461         if (ehdr->e_type == ET_EXEC) {
 462 #endif
 463 #if defined(__i386__) || defined(__amd64__)
 464 #if __ELF_WORD_SIZE == 64
 465                 /* x86_64 relocates after locore */
 466                 off = - (off & 0xffffffffff000000ull);
 467 #else
 468                 /* i386 relocates after locore */
 469                 off = - (off & 0xff000000u);
 470 #endif
 471 #elif defined(__powerpc__)
 472                 /*
 473                  * On the purely virtual memory machines like e500, the kernel
 474                  * is linked against its final VA range, which is most often
 475                  * not available at the loader stage, but only after kernel
 476                  * initializes and completes its VM settings. In such cases we
 477                  * cannot use p_vaddr field directly to load ELF segments, but
 478                  * put them at some 'load-time' locations.
 479                  */
 480                 if (off & 0xf0000000u) {
 481                         off = -(off & 0xf0000000u);
 482                         /*
 483                          * XXX the physical load address should not be
 484                          * hardcoded. Note that the Book-E kernel assumes that
 485                          * it's loaded at a 16MB boundary for now...
 486                          */
 487                         off += 0x01000000;
 488                 }
 489                 ehdr->e_entry += off;
 490 #ifdef ELF_VERBOSE
 491                 printf("Converted entry 0x%jx\n", (uintmax_t)ehdr->e_entry);
 492 #endif
 493 #elif defined(__arm__) && !defined(EFI)
 494                 /*
 495                  * The elf headers in arm kernels specify virtual addresses in
 496                  * all header fields, even the ones that should be physical
 497                  * addresses.  We assume the entry point is in the first page,
 498                  * and masking the page offset will leave us with the virtual
 499                  * address the kernel was linked at.  We subtract that from the
 500                  * load offset, making 'off' into the value which, when added
 501                  * to a virtual address in an elf header, translates it to a
 502                  * physical address.  We do the va->pa conversion on the entry
 503                  * point address in the header now, so that later we can launch
 504                  * the kernel by just jumping to that address.
 505                  *
 506                  * When booting from UEFI the copyin and copyout functions
 507                  * handle adjusting the location relative to the first virtual
 508                  * address.  Because of this there is no need to adjust the
 509                  * offset or entry point address as these will both be handled
 510                  * by the efi code.
 511                  */
 512                 off -= ehdr->e_entry & ~PAGE_MASK;
 513                 ehdr->e_entry += off;
 514 #ifdef ELF_VERBOSE
 515                 printf("ehdr->e_entry 0x%jx, va<->pa off %llx\n",
 516                     (uintmax_t)ehdr->e_entry, off);
 517 #endif
 518 #else
 519                 off = 0;        /* other archs use direct mapped kernels */
 520 #endif
 521         }
 522         ef->off = off;
 523
 524         if (ef->kernel)
 525                 __elfN(relocation_offset) = off;
 526
 527         if ((ehdr->e_phoff + ehdr->e_phnum * sizeof(*phdr)) > ef->firstlen) {
 528                 printf("elf" __XSTRING(__ELF_WORD_SIZE)
 529                     "_loadimage: program header not within first page\n");
 530                 goto out;
 531         }
 532         phdr = (Elf_Phdr *)(ef->firstpage + ehdr->e_phoff);
 533
 534         for (i = 0; i < ehdr->e_phnum; i++) {
 535                 if (elf_program_header_convert(ehdr, phdr))
 536                         continue;
 537
 538                 /* We want to load PT_LOAD segments only.. */
 539                 if (phdr[i].p_type != PT_LOAD)
 540                         continue;
 541
 542 #ifdef ELF_VERBOSE
 543                 printf("Segment: 0x%lx@0x%lx -> 0x%lx-0x%lx",
 544                     (long)phdr[i].p_filesz, (long)phdr[i].p_offset,
 545                     (long)(phdr[i].p_vaddr + off),
 546                     (long)(phdr[i].p_vaddr + off + phdr[i].p_memsz - 1));
 547 #else
 548                 if ((phdr[i].p_flags & PF_W) == 0) {
 549                         printf("text=0x%lx ", (long)phdr[i].p_filesz);
 550                 } else {
 551                         printf("data=0x%lx", (long)phdr[i].p_filesz);
 552                         if (phdr[i].p_filesz < phdr[i].p_memsz)
 553                                 printf("+0x%lx", (long)(phdr[i].p_memsz -
 554                                     phdr[i].p_filesz));
 555                         printf(" ");
 556                 }
 557 #endif
 558                 fpcopy = 0;
 559                 if (ef->firstlen > phdr[i].p_offset) {
 560                         fpcopy = ef->firstlen - phdr[i].p_offset;
 561                         archsw.arch_copyin(ef->firstpage + phdr[i].p_offset,
 562                             phdr[i].p_vaddr + off, fpcopy);
 563                 }
 564                 if (phdr[i].p_filesz > fpcopy) {
 565                         if (kern_pread(ef->fd, phdr[i].p_vaddr + off + fpcopy,
 566                             phdr[i].p_filesz - fpcopy,
 567                             phdr[i].p_offset + fpcopy) != 0) {
 568                                 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
 569                                     "_loadimage: read failed\n");
 570                                 goto out;
 571                         }
 572                 }
 573                 /* clear space from oversized segments; eg: bss */
 574                 if (phdr[i].p_filesz < phdr[i].p_memsz) {
 575 #ifdef ELF_VERBOSE
 576                         printf(" (bss: 0x%lx-0x%lx)",
 577                             (long)(phdr[i].p_vaddr + off + phdr[i].p_filesz),
 578                             (long)(phdr[i].p_vaddr + off + phdr[i].p_memsz -1));
 579 #endif
 580
 581                         kern_bzero(phdr[i].p_vaddr + off + phdr[i].p_filesz,
 582                             phdr[i].p_memsz - phdr[i].p_filesz);
 583                 }
 584 #ifdef ELF_VERBOSE
 585                 printf("\n");
 586 #endif
 587
 588                 if (archsw.arch_loadseg != NULL)
 589                         archsw.arch_loadseg(ehdr, phdr + i, off);
 590
 591                 if (firstaddr == 0 || firstaddr > (phdr[i].p_vaddr + off))
 592                         firstaddr = phdr[i].p_vaddr + off;
 593                 if (lastaddr == 0 || lastaddr <
 594                     (phdr[i].p_vaddr + off + phdr[i].p_memsz))
 595                         lastaddr = phdr[i].p_vaddr + off + phdr[i].p_memsz;
 596         }
 597         lastaddr = roundup(lastaddr, sizeof(long));
 598
 599         /*
 600          * Get the section headers.  We need this for finding the .ctors
 601          * section as well as for loading any symbols.  Both may be hard
 602          * to do if reading from a .gz file as it involves seeking.  I
 603          * think the rule is going to have to be that you must strip a
 604          * file to remove symbols before gzipping it.
 605          */
 606         chunk = (size_t)ehdr->e_shnum * (size_t)ehdr->e_shentsize;
 607         if (chunk == 0 || ehdr->e_shoff == 0)
 608                 goto nosyms;
 609         shdr = alloc_pread(ef->fd, ehdr->e_shoff, chunk);
 610         if (shdr == NULL) {
 611                 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
 612                     "_loadimage: failed to read section headers");
 613                 goto nosyms;
 614         }
 615
 616         for (i = 0; i < ehdr->e_shnum; i++)
 617                 elf_section_header_convert(ehdr, &shdr[i]);
 618
 619         file_addmetadata(fp, MODINFOMD_SHDR, chunk, shdr);
 620
 621         /*
 622          * Read the section string table and look for the .ctors section.
 623          * We need to tell the kernel where it is so that it can call the
 624          * ctors.
 625          */
 626         chunk = shdr[ehdr->e_shstrndx].sh_size;
 627         if (chunk) {
 628                 shstr = alloc_pread(ef->fd, shdr[ehdr->e_shstrndx].sh_offset,
 629                     chunk);
 630                 if (shstr) {
 631                         for (i = 0; i < ehdr->e_shnum; i++) {
 632                                 if (strcmp(shstr + shdr[i].sh_name,
 633                                     ".ctors") != 0)
 634                                         continue;
 635                                 ctors = shdr[i].sh_addr;
 636                                 file_addmetadata(fp, MODINFOMD_CTORS_ADDR,
 637                                     sizeof(ctors), &ctors);
 638                                 size = shdr[i].sh_size;
 639                                 file_addmetadata(fp, MODINFOMD_CTORS_SIZE,
 640                                     sizeof(size), &size);
 641                                 break;
 642                         }
 643                         free(shstr);
 644                 }
 645         }
 646
 647         /*
 648          * Now load any symbols.
 649          */
 650         symtabindex = -1;
 651         symstrindex = -1;
 652         for (i = 0; i < ehdr->e_shnum; i++) {
 653                 if (shdr[i].sh_type != SHT_SYMTAB)
 654                         continue;
 655                 for (j = 0; j < ehdr->e_phnum; j++) {
 656                         if (phdr[j].p_type != PT_LOAD)
 657                                 continue;
 658                         if (shdr[i].sh_offset >= phdr[j].p_offset &&
 659                             (shdr[i].sh_offset + shdr[i].sh_size <=
 660                             phdr[j].p_offset + phdr[j].p_filesz)) {
 661                                 shdr[i].sh_offset = 0;
 662                                 shdr[i].sh_size = 0;
 663                                 break;
 664                         }
 665                 }
 666                 if (shdr[i].sh_offset == 0 || shdr[i].sh_size == 0)
 667                         continue;       /* alread loaded in a PT_LOAD above */
 668                 /* Save it for loading below */
 669                 symtabindex = i;
 670                 symstrindex = shdr[i].sh_link;
 671         }
 672         if (symtabindex < 0 || symstrindex < 0)
 673                 goto nosyms;
 674
 675         /* Ok, committed to a load. */
 676 #ifndef ELF_VERBOSE
 677         printf("syms=[");
 678 #endif
 679         ssym = lastaddr;
 680         for (i = symtabindex; i >= 0; i = symstrindex) {
 681 #ifdef ELF_VERBOSE
 682                 char    *secname;
 683
 684                 switch(shdr[i].sh_type) {
 685                 case SHT_SYMTAB:                /* Symbol table */
 686                         secname = "symtab";
 687                         break;
 688                 case SHT_STRTAB:                /* String table */
 689                         secname = "strtab";
 690                         break;
 691                 default:
 692                         secname = "WHOA!!";
 693                         break;
 694                 }
 695 #endif
 696                 size = shdr[i].sh_size;
 697 #if defined(__powerpc__)
 698   #if __ELF_WORD_SIZE == 64
 699                 size = htobe64(size);
 700   #else
 701                 size = htobe32(size);
 702   #endif
 703 #endif
 704
 705                 archsw.arch_copyin(&size, lastaddr, sizeof(size));
 706                 lastaddr += sizeof(size);
 707
 708 #ifdef ELF_VERBOSE
 709                 printf("\n%s: 0x%jx@0x%jx -> 0x%jx-0x%jx", secname,
 710                     (uintmax_t)shdr[i].sh_size, (uintmax_t)shdr[i].sh_offset,
 711                     (uintmax_t)lastaddr,
 712                     (uintmax_t)(lastaddr + shdr[i].sh_size));
 713 #else
 714                 if (i == symstrindex)
 715                         printf("+");
 716                 printf("0x%lx+0x%lx", (long)sizeof(size), (long)size);
 717 #endif
 718
 719                 if (lseek(ef->fd, (off_t)shdr[i].sh_offset, SEEK_SET) == -1) {
 720                         printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
 721                            "_loadimage: could not seek for symbols - skipped!");
 722                         lastaddr = ssym;
 723                         ssym = 0;
 724                         goto nosyms;
 725                 }
 726                 result = archsw.arch_readin(ef->fd, lastaddr, shdr[i].sh_size);
 727                 if (result < 0 || (size_t)result != shdr[i].sh_size) {
 728                         printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
 729                             "_loadimage: could not read symbols - skipped! "
 730                             "(%ju != %ju)", (uintmax_t)result,
 731                             (uintmax_t)shdr[i].sh_size);
 732                         lastaddr = ssym;
 733                         ssym = 0;
 734                         goto nosyms;
 735                 }
 736                 /* Reset offsets relative to ssym */
 737                 lastaddr += shdr[i].sh_size;
 738                 lastaddr = roundup(lastaddr, sizeof(size));
 739                 if (i == symtabindex)
 740                         symtabindex = -1;
 741                 else if (i == symstrindex)
 742                         symstrindex = -1;
 743         }
 744         esym = lastaddr;
 745 #ifndef ELF_VERBOSE
 746         printf("]");
 747 #endif
 748
 749 #if defined(__powerpc__)
 750   /* On PowerPC we always need to provide BE data to the kernel */
 751   #if __ELF_WORD_SIZE == 64
 752         ssym = htobe64((uint64_t)ssym);
 753         esym = htobe64((uint64_t)esym);
 754   #else
 755         ssym = htobe32((uint32_t)ssym);
 756         esym = htobe32((uint32_t)esym);
 757   #endif
 758 #endif
 759
 760         file_addmetadata(fp, MODINFOMD_SSYM, sizeof(ssym), &ssym);
 761         file_addmetadata(fp, MODINFOMD_ESYM, sizeof(esym), &esym);
 762
 763 nosyms:
 764         printf("\n");
 765
 766         ret = lastaddr - firstaddr;
 767         fp->f_addr = firstaddr;
 768
 769         php = NULL;
 770         for (i = 0; i < ehdr->e_phnum; i++) {
 771                 if (phdr[i].p_type == PT_DYNAMIC) {
 772                         php = phdr + i;
 773                         adp = php->p_vaddr;
 774                         file_addmetadata(fp, MODINFOMD_DYNAMIC, sizeof(adp),
 775                             &adp);
 776                         break;
 777                 }
 778         }
 779
 780         if (php == NULL) /* this is bad, we cannot get to symbols or _DYNAMIC */
 781                 goto out;
 782
 783         ndp = php->p_filesz / sizeof(Elf_Dyn);
 784         if (ndp == 0)
 785                 goto out;
 786         dp = malloc(php->p_filesz);
 787         if (dp == NULL)
 788                 goto out;
 789         archsw.arch_copyout(php->p_vaddr + off, dp, php->p_filesz);
 790
 791         ef->strsz = 0;
 792         for (i = 0; i < ndp; i++) {
 793                 if (dp[i].d_tag == 0)
 794                         break;
 795                 switch (dp[i].d_tag) {
 796                 case DT_HASH:
 797                         ef->hashtab =
 798                             (Elf_Hashelt*)(uintptr_t)(dp[i].d_un.d_ptr + off);
 799                         break;
 800                 case DT_STRTAB:
 801                         ef->strtab =
 802                             (char *)(uintptr_t)(dp[i].d_un.d_ptr + off);
 803                         break;
 804                 case DT_STRSZ:
 805                         ef->strsz = dp[i].d_un.d_val;
 806                         break;
 807                 case DT_SYMTAB:
 808                         ef->symtab =
 809                             (Elf_Sym *)(uintptr_t)(dp[i].d_un.d_ptr + off);
 810                         break;
 811                 case DT_REL:
 812                         ef->rel =
 813                             (Elf_Rel *)(uintptr_t)(dp[i].d_un.d_ptr + off);
 814                         break;
 815                 case DT_RELSZ:
 816                         ef->relsz = dp[i].d_un.d_val;
 817                         break;
 818                 case DT_RELA:
 819                         ef->rela =
 820                             (Elf_Rela *)(uintptr_t)(dp[i].d_un.d_ptr + off);
 821                         break;
 822                 case DT_RELASZ:
 823                         ef->relasz = dp[i].d_un.d_val;
 824                         break;
 825                 default:
 826                         break;
 827                 }
 828         }
 829         if (ef->hashtab == NULL || ef->symtab == NULL ||
 830             ef->strtab == NULL || ef->strsz == 0)
 831                 goto out;
 832         COPYOUT(ef->hashtab, &ef->nbuckets, sizeof(ef->nbuckets));
 833         COPYOUT(ef->hashtab + 1, &ef->nchains, sizeof(ef->nchains));
 834         ef->buckets = ef->hashtab + 2;
 835         ef->chains = ef->buckets + ef->nbuckets;
 836
 837         if (__elfN(lookup_symbol)(fp, ef, "__start_set_modmetadata_set",
 838             &sym) != 0)
 839                 return 0;
 840         p_start = sym.st_value + ef->off;
 841         if (__elfN(lookup_symbol)(fp, ef, "__stop_set_modmetadata_set",
 842             &sym) != 0)
 843                 return ENOENT;
 844         p_end = sym.st_value + ef->off;
 845
 846         if (__elfN(parse_modmetadata)(fp, ef, p_start, p_end) == 0)
 847                 goto out;
 848
 849         if (ef->kernel)         /* kernel must not depend on anything */
 850                 goto out;
 851
 852 out:
 853         if (dp)
 854                 free(dp);
 855         if (shdr)
 856                 free(shdr);
 857         return ret;
 858 }
 859
 860 static char invalid_name[] = "bad";
 861
 862 char *
 863 fake_modname(const char *name)
 864 {
 865         const char *sp, *ep;
 866         char *fp;
 867         size_t len;
 868
 869         sp = strrchr(name, '/');
 870         if (sp)
 871                 sp++;
 872         else
 873                 sp = name;
 874
 875         ep = strrchr(sp, '.');
 876         if (ep == NULL) {
 877                 ep = sp + strlen(sp);
 878         }
 879         if (ep == sp) {
 880                 sp = invalid_name;
 881                 ep = invalid_name + sizeof(invalid_name) - 1;
 882         }
 883
 884         len = ep - sp;
 885         fp = malloc(len + 1);
 886         if (fp == NULL)
 887                 return NULL;
 888         memcpy(fp, sp, len);
 889         fp[len] = '\0';
 890         return fp;
 891 }
 892
 893 #if (defined(__i386__) || defined(__powerpc__)) && __ELF_WORD_SIZE == 64
 894 struct mod_metadata64 {
 895         int             md_version;     /* structure version MDTV_* */
 896         int             md_type;        /* type of entry MDT_* */
 897         uint64_t        md_data;        /* specific data */
 898         uint64_t        md_cval;        /* common string label */
 899 };
 900 #endif
 901 #if defined(__amd64__) && __ELF_WORD_SIZE == 32
 902 struct mod_metadata32 {
 903         int             md_version;     /* structure version MDTV_* */
 904         int             md_type;        /* type of entry MDT_* */
 905         uint32_t        md_data;        /* specific data */
 906         uint32_t        md_cval;        /* common string label */
 907 };
 908 #endif
 909
 910 int
 911 __elfN(load_modmetadata)(struct preloaded_file *fp, uint64_t dest)
 912 {
 913         struct elf_file          ef;
 914         int                      err, i, j;
 915         Elf_Shdr                *sh_meta, *shdr = NULL;
 916         Elf_Shdr                *sh_data[2];
 917         char                    *shstrtab = NULL;
 918         size_t                   size;
 919         Elf_Addr                 p_start, p_end;
 920
 921         bzero(&ef, sizeof(struct elf_file));
 922         ef.fd = -1;
 923
 924         err = __elfN(load_elf_header)(fp->f_name, &ef);
 925         if (err != 0)
 926                 goto out;
 927
 928         if (ef.kernel == 1 || ef.ehdr->e_type == ET_EXEC) {
 929                 ef.kernel = 1;
 930         } else if (ef.ehdr->e_type != ET_DYN) {
 931                 err = EFTYPE;
 932                 goto out;
 933         }
 934
 935         size = (size_t)ef.ehdr->e_shnum * (size_t)ef.ehdr->e_shentsize;
 936         shdr = alloc_pread(ef.fd, ef.ehdr->e_shoff, size);
 937         if (shdr == NULL) {
 938                 err = ENOMEM;
 939                 goto out;
 940         }
 941
 942         /* Load shstrtab. */
 943         shstrtab = alloc_pread(ef.fd, shdr[ef.ehdr->e_shstrndx].sh_offset,
 944             shdr[ef.ehdr->e_shstrndx].sh_size);
 945         if (shstrtab == NULL) {
 946                 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
 947                     "load_modmetadata: unable to load shstrtab\n");
 948                 err = EFTYPE;
 949                 goto out;
 950         }
 951
 952         /* Find set_modmetadata_set and data sections. */
 953         sh_data[0] = sh_data[1] = sh_meta = NULL;
 954         for (i = 0, j = 0; i < ef.ehdr->e_shnum; i++) {
 955                 if (strcmp(&shstrtab[shdr[i].sh_name],
 956                     "set_modmetadata_set") == 0) {
 957                         sh_meta = &shdr[i];
 958                 }
 959                 if ((strcmp(&shstrtab[shdr[i].sh_name], ".data") == 0) ||
 960                     (strcmp(&shstrtab[shdr[i].sh_name], ".rodata") == 0)) {
 961                         sh_data[j++] = &shdr[i];
 962                 }
 963         }
 964         if (sh_meta == NULL || sh_data[0] == NULL || sh_data[1] == NULL) {
 965                 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
 966     "load_modmetadata: unable to find set_modmetadata_set or data sections\n");
 967                 err = EFTYPE;
 968                 goto out;
 969         }
 970
 971         /* Load set_modmetadata_set into memory */
 972         err = kern_pread(ef.fd, dest, sh_meta->sh_size, sh_meta->sh_offset);
 973         if (err != 0) {
 974                 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
 975     "load_modmetadata: unable to load set_modmetadata_set: %d\n", err);
 976                 goto out;
 977         }
 978         p_start = dest;
 979         p_end = dest + sh_meta->sh_size;
 980         dest += sh_meta->sh_size;
 981
 982         /* Load data sections into memory. */
 983         err = kern_pread(ef.fd, dest, sh_data[0]->sh_size,
 984             sh_data[0]->sh_offset);
 985         if (err != 0) {
 986                 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
 987                     "load_modmetadata: unable to load data: %d\n", err);
 988                 goto out;
 989         }
 990
 991         /*
 992          * We have to increment the dest, so that the offset is the same into
 993          * both the .rodata and .data sections.
 994          */
 995         ef.off = -(sh_data[0]->sh_addr - dest);
 996         dest += (sh_data[1]->sh_addr - sh_data[0]->sh_addr);
 997
 998         err = kern_pread(ef.fd, dest, sh_data[1]->sh_size,
 999             sh_data[1]->sh_offset);
1000         if (err != 0) {
1001                 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
1002                     "load_modmetadata: unable to load data: %d\n", err);
1003                 goto out;
1004         }
1005
1006         err = __elfN(parse_modmetadata)(fp, &ef, p_start, p_end);
1007         if (err != 0) {
1008                 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
1009                     "load_modmetadata: unable to parse metadata: %d\n", err);
1010                 goto out;
1011         }
1012
1013 out:
1014         if (shstrtab != NULL)
1015                 free(shstrtab);
1016         if (shdr != NULL)
1017                 free(shdr);
1018         if (ef.firstpage != NULL)
1019                 free(ef.firstpage);
1020         if (ef.fd != -1)
1021                 close(ef.fd);
1022         return (err);
1023 }
1024
1025 int
1026 __elfN(parse_modmetadata)(struct preloaded_file *fp, elf_file_t ef,
1027     Elf_Addr p_start, Elf_Addr p_end)
1028 {
1029         struct mod_metadata md;
1030 #if (defined(__i386__) || defined(__powerpc__)) && __ELF_WORD_SIZE == 64
1031         struct mod_metadata64 md64;
1032 #elif defined(__amd64__) && __ELF_WORD_SIZE == 32
1033         struct mod_metadata32 md32;
1034 #endif
1035         struct mod_depend *mdepend;
1036         struct mod_version mver;
1037         char *s;
1038         int error, modcnt, minfolen;
1039         Elf_Addr v, p;
1040
1041         modcnt = 0;
1042         p = p_start;
1043         while (p < p_end) {
1044                 COPYOUT(p, &v, sizeof(v));
1045                 error = __elfN(reloc_ptr)(fp, ef, p, &v, sizeof(v));
1046                 if (error == EOPNOTSUPP)
1047                         v += ef->off;
1048                 else if (error != 0)
1049                         return (error);
1050 #if (defined(__i386__) || defined(__powerpc__)) && __ELF_WORD_SIZE == 64
1051                 COPYOUT(v, &md64, sizeof(md64));
1052                 error = __elfN(reloc_ptr)(fp, ef, v, &md64, sizeof(md64));
1053                 if (error == EOPNOTSUPP) {
1054                         md64.md_cval += ef->off;
1055                         md64.md_data += ef->off;
1056                 } else if (error != 0)
1057                         return (error);
1058                 md.md_version = md64.md_version;
1059                 md.md_type = md64.md_type;
1060                 md.md_cval = (const char *)(uintptr_t)md64.md_cval;
1061                 md.md_data = (void *)(uintptr_t)md64.md_data;
1062 #elif defined(__amd64__) && __ELF_WORD_SIZE == 32
1063                 COPYOUT(v, &md32, sizeof(md32));
1064                 error = __elfN(reloc_ptr)(fp, ef, v, &md32, sizeof(md32));
1065                 if (error == EOPNOTSUPP) {
1066                         md32.md_cval += ef->off;
1067                         md32.md_data += ef->off;
1068                 } else if (error != 0)
1069                         return (error);
1070                 md.md_version = md32.md_version;
1071                 md.md_type = md32.md_type;
1072                 md.md_cval = (const char *)(uintptr_t)md32.md_cval;
1073                 md.md_data = (void *)(uintptr_t)md32.md_data;
1074 #else
1075                 COPYOUT(v, &md, sizeof(md));
1076                 error = __elfN(reloc_ptr)(fp, ef, v, &md, sizeof(md));
1077                 if (error == EOPNOTSUPP) {
1078                         md.md_cval += ef->off;
1079                         md.md_data = (void *)((uintptr_t)md.md_data +
1080                             (uintptr_t)ef->off);
1081                 } else if (error != 0)
1082                         return (error);
1083 #endif
1084                 p += sizeof(Elf_Addr);
1085                 switch(md.md_type) {
1086                 case MDT_DEPEND:
1087                         if (ef->kernel) /* kernel must not depend on anything */
1088                                 break;
1089                         s = strdupout((vm_offset_t)md.md_cval);
1090                         minfolen = sizeof(*mdepend) + strlen(s) + 1;
1091                         mdepend = malloc(minfolen);
1092                         if (mdepend == NULL)
1093                                 return ENOMEM;
1094                         COPYOUT((vm_offset_t)md.md_data, mdepend,
1095                             sizeof(*mdepend));
1096                         strcpy((char*)(mdepend + 1), s);
1097                         free(s);
1098                         file_addmetadata(fp, MODINFOMD_DEPLIST, minfolen,
1099                             mdepend);
1100                         free(mdepend);
1101                         break;
1102                 case MDT_VERSION:
1103                         s = strdupout((vm_offset_t)md.md_cval);
1104                         COPYOUT((vm_offset_t)md.md_data, &mver, sizeof(mver));
1105                         file_addmodule(fp, s, mver.mv_version, NULL);
1106                         free(s);
1107                         modcnt++;
1108                         break;
1109                 }
1110         }
1111         if (modcnt == 0) {
1112                 s = fake_modname(fp->f_name);
1113                 file_addmodule(fp, s, 1, NULL);
1114                 free(s);
1115         }
1116         return 0;
1117 }
1118
1119 static unsigned long
1120 elf_hash(const char *name)
1121 {
1122         const unsigned char *p = (const unsigned char *) name;
1123         unsigned long h = 0;
1124         unsigned long g;
1125
1126         while (*p != '\0') {
1127                 h = (h << 4) + *p++;
1128                 if ((g = h & 0xf0000000) != 0)
1129                         h ^= g >> 24;
1130                 h &= ~g;
1131         }
1132         return h;
1133 }
1134
1135 static const char __elfN(bad_symtable)[] = "elf" __XSTRING(__ELF_WORD_SIZE)
1136     "_lookup_symbol: corrupt symbol table\n";
1137 int
1138 __elfN(lookup_symbol)(struct preloaded_file *fp, elf_file_t ef,
1139     const char* name, Elf_Sym *symp)
1140 {
1141         Elf_Hashelt symnum;
1142         Elf_Sym sym;
1143         char *strp;
1144         unsigned long hash;
1145
1146         hash = elf_hash(name);
1147         COPYOUT(&ef->buckets[hash % ef->nbuckets], &symnum, sizeof(symnum));
1148
1149         while (symnum != STN_UNDEF) {
1150                 if (symnum >= ef->nchains) {
1151                         printf(__elfN(bad_symtable));
1152                         return ENOENT;
1153                 }
1154
1155                 COPYOUT(ef->symtab + symnum, &sym, sizeof(sym));
1156                 if (sym.st_name == 0) {
1157                         printf(__elfN(bad_symtable));
1158                         return ENOENT;
1159                 }
1160
1161                 strp = strdupout((vm_offset_t)(ef->strtab + sym.st_name));
1162                 if (strcmp(name, strp) == 0) {
1163                         free(strp);
1164                         if (sym.st_shndx != SHN_UNDEF ||
1165                             (sym.st_value != 0 &&
1166                             ELF_ST_TYPE(sym.st_info) == STT_FUNC)) {
1167                                 *symp = sym;
1168                                 return 0;
1169                         }
1170                         return ENOENT;
1171                 }
1172                 free(strp);
1173                 COPYOUT(&ef->chains[symnum], &symnum, sizeof(symnum));
1174         }
1175         return ENOENT;
1176 }
1177
1178 /*
1179  * Apply any intra-module relocations to the value. p is the load address
1180  * of the value and val/len is the value to be modified. This does NOT modify
1181  * the image in-place, because this is done by kern_linker later on.
1182  *
1183  * Returns EOPNOTSUPP if no relocation method is supplied.
1184  */
1185 static int
1186 __elfN(reloc_ptr)(struct preloaded_file *mp, elf_file_t ef,
1187     Elf_Addr p, void *val, size_t len)
1188 {
1189         size_t n;
1190         Elf_Rela a;
1191         Elf_Rel r;
1192         int error;
1193
1194         /*
1195          * The kernel is already relocated, but we still want to apply
1196          * offset adjustments.
1197          */
1198         if (ef->kernel)
1199                 return (EOPNOTSUPP);
1200
1201         for (n = 0; n < ef->relsz / sizeof(r); n++) {
1202                 COPYOUT(ef->rel + n, &r, sizeof(r));
1203
1204                 error = __elfN(reloc)(ef, __elfN(symaddr), &r, ELF_RELOC_REL,
1205                     ef->off, p, val, len);
1206                 if (error != 0)
1207                         return (error);
1208         }
1209         for (n = 0; n < ef->relasz / sizeof(a); n++) {
1210                 COPYOUT(ef->rela + n, &a, sizeof(a));
1211
1212                 error = __elfN(reloc)(ef, __elfN(symaddr), &a, ELF_RELOC_RELA,
1213                     ef->off, p, val, len);
1214                 if (error != 0)
1215                         return (error);
1216         }
1217
1218         return (0);
1219 }
1220
1221 static Elf_Addr
1222 __elfN(symaddr)(struct elf_file *ef, Elf_Size symidx)
1223 {
1224
1225         /* Symbol lookup by index not required here. */
1226         return (0);
1227 }