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         return (0);
 249
 250 error:
 251         if (ef->firstpage != NULL) {
 252                 free(ef->firstpage);
 253                 ef->firstpage = NULL;
 254         }
 255         if (ef->fd != -1) {
 256                 close(ef->fd);
 257                 ef->fd = -1;
 258         }
 259         return (err);
 260 }
 261
 262 /*
 263  * Attempt to load the file (file) as an ELF module.  It will be stored at
 264  * (dest), and a pointer to a module structure describing the loaded object
 265  * will be saved in (result).
 266  */
 267 int
 268 __elfN(loadfile)(char *filename, uint64_t dest, struct preloaded_file **result)
 269 {
 270         return (__elfN(loadfile_raw)(filename, dest, result, 0));
 271 }
 272
 273 int
 274 __elfN(loadfile_raw)(char *filename, uint64_t dest,
 275     struct preloaded_file **result, int multiboot)
 276 {
 277         struct preloaded_file   *fp, *kfp;
 278         struct elf_file         ef;
 279         Elf_Ehdr                *ehdr;
 280         int                     err;
 281
 282         fp = NULL;
 283         bzero(&ef, sizeof(struct elf_file));
 284         ef.fd = -1;
 285
 286         err = __elfN(load_elf_header)(filename, &ef);
 287         if (err != 0)
 288                 return (err);
 289
 290         ehdr = ef.ehdr;
 291
 292         /*
 293          * Check to see what sort of module we are.
 294          */
 295         kfp = file_findfile(NULL, __elfN(kerneltype));
 296 #ifdef __powerpc__
 297         /*
 298          * Kernels can be ET_DYN, so just assume the first loaded object is the
 299          * kernel. This assumption will be checked later.
 300          */
 301         if (kfp == NULL)
 302                 ef.kernel = 1;
 303 #endif
 304         if (ef.kernel || ehdr->e_type == ET_EXEC) {
 305                 /* Looks like a kernel */
 306                 if (kfp != NULL) {
 307                         printf("elf" __XSTRING(__ELF_WORD_SIZE)
 308                             "_loadfile: kernel already loaded\n");
 309                         err = EPERM;
 310                         goto oerr;
 311                 }
 312                 /*
 313                  * Calculate destination address based on kernel entrypoint.
 314                  *
 315                  * For ARM, the destination address is independent of any values
 316                  * in the elf header (an ARM kernel can be loaded at any 2MB
 317                  * boundary), so we leave dest set to the value calculated by
 318                  * archsw.arch_loadaddr() and passed in to this function.
 319                  */
 320 #ifndef __arm__
 321                 if (ehdr->e_type == ET_EXEC)
 322                         dest = (ehdr->e_entry & ~PAGE_MASK);
 323 #endif
 324                 if ((ehdr->e_entry & ~PAGE_MASK) == 0) {
 325                         printf("elf" __XSTRING(__ELF_WORD_SIZE)
 326                             "_loadfile: not a kernel (maybe static binary?)\n");
 327                         err = EPERM;
 328                         goto oerr;
 329                 }
 330                 ef.kernel = 1;
 331
 332         } else if (ehdr->e_type == ET_DYN) {
 333                 /* Looks like a kld module */
 334                 if (multiboot != 0) {
 335                         printf("elf" __XSTRING(__ELF_WORD_SIZE)
 336                             "_loadfile: can't load module as multiboot\n");
 337                         err = EPERM;
 338                         goto oerr;
 339                 }
 340                 if (kfp == NULL) {
 341                         printf("elf" __XSTRING(__ELF_WORD_SIZE)
 342                             "_loadfile: can't load module before kernel\n");
 343                         err = EPERM;
 344                         goto oerr;
 345                 }
 346                 if (strcmp(__elfN(kerneltype), kfp->f_type)) {
 347                         printf("elf" __XSTRING(__ELF_WORD_SIZE)
 348                          "_loadfile: can't load module with kernel type '%s'\n",
 349                             kfp->f_type);
 350                         err = EPERM;
 351                         goto oerr;
 352                 }
 353                 /* Looks OK, got ahead */
 354                 ef.kernel = 0;
 355
 356         } else {
 357                 err = EFTYPE;
 358                 goto oerr;
 359         }
 360
 361         if (archsw.arch_loadaddr != NULL)
 362                 dest = archsw.arch_loadaddr(LOAD_ELF, ehdr, dest);
 363         else
 364                 dest = roundup(dest, PAGE_SIZE);
 365
 366         /*
 367          * Ok, we think we should handle this.
 368          */
 369         fp = file_alloc();
 370         if (fp == NULL) {
 371                 printf("elf" __XSTRING(__ELF_WORD_SIZE)
 372                     "_loadfile: cannot allocate module info\n");
 373                 err = EPERM;
 374                 goto out;
 375         }
 376         if (ef.kernel == 1 && multiboot == 0)
 377                 setenv("kernelname", filename, 1);
 378         fp->f_name = strdup(filename);
 379         if (multiboot == 0)
 380                 fp->f_type = strdup(ef.kernel ?
 381                     __elfN(kerneltype) : __elfN(moduletype));
 382         else
 383                 fp->f_type = strdup("elf multiboot kernel");
 384
 385 #ifdef ELF_VERBOSE
 386         if (ef.kernel)
 387                 printf("%s entry at 0x%jx\n", filename,
 388                     (uintmax_t)ehdr->e_entry);
 389 #else
 390         printf("%s ", filename);
 391 #endif
 392
 393         fp->f_size = __elfN(loadimage)(fp, &ef, dest);
 394         if (fp->f_size == 0 || fp->f_addr == 0)
 395                 goto ioerr;
 396
 397         /* save exec header as metadata */
 398         file_addmetadata(fp, MODINFOMD_ELFHDR, sizeof(*ehdr), ehdr);
 399
 400         /* Load OK, return module pointer */
 401         *result = (struct preloaded_file *)fp;
 402         err = 0;
 403         goto out;
 404
 405 ioerr:
 406         err = EIO;
 407 oerr:
 408         file_discard(fp);
 409 out:
 410         if (ef.firstpage)
 411                 free(ef.firstpage);
 412         if (ef.fd != -1)
 413                 close(ef.fd);
 414         return (err);
 415 }
 416
 417 /*
 418  * With the file (fd) open on the image, and (ehdr) containing
 419  * the Elf header, load the image at (off)
 420  */
 421 static int
 422 __elfN(loadimage)(struct preloaded_file *fp, elf_file_t ef, uint64_t off)
 423 {
 424         int             i;
 425         u_int           j;
 426         Elf_Ehdr        *ehdr;
 427         Elf_Phdr        *phdr, *php;
 428         Elf_Shdr        *shdr;
 429         char            *shstr;
 430         int             ret;
 431         vm_offset_t     firstaddr;
 432         vm_offset_t     lastaddr;
 433         size_t          chunk;
 434         ssize_t         result;
 435         Elf_Addr        ssym, esym;
 436         Elf_Dyn         *dp;
 437         Elf_Addr        adp;
 438         Elf_Addr        ctors;
 439         int             ndp;
 440         int             symstrindex;
 441         int             symtabindex;
 442         Elf_Size        size;
 443         u_int           fpcopy;
 444         Elf_Sym         sym;
 445         Elf_Addr        p_start, p_end;
 446
 447         dp = NULL;
 448         shdr = NULL;
 449         ret = 0;
 450         firstaddr = lastaddr = 0;
 451         ehdr = ef->ehdr;
 452         if (ehdr->e_type == ET_EXEC) {
 453 #if defined(__i386__) || defined(__amd64__)
 454 #if __ELF_WORD_SIZE == 64
 455                 /* x86_64 relocates after locore */
 456                 off = - (off & 0xffffffffff000000ull);
 457 #else
 458                 /* i386 relocates after locore */
 459                 off = - (off & 0xff000000u);
 460 #endif
 461 #elif defined(__powerpc__)
 462                 /*
 463                  * On the purely virtual memory machines like e500, the kernel
 464                  * is linked against its final VA range, which is most often
 465                  * not available at the loader stage, but only after kernel
 466                  * initializes and completes its VM settings. In such cases we
 467                  * cannot use p_vaddr field directly to load ELF segments, but
 468                  * put them at some 'load-time' locations.
 469                  */
 470                 if (off & 0xf0000000u) {
 471                         off = -(off & 0xf0000000u);
 472                         /*
 473                          * XXX the physical load address should not be
 474                          * hardcoded. Note that the Book-E kernel assumes that
 475                          * it's loaded at a 16MB boundary for now...
 476                          */
 477                         off += 0x01000000;
 478                         ehdr->e_entry += off;
 479 #ifdef ELF_VERBOSE
 480                         printf("Converted entry 0x%08x\n", ehdr->e_entry);
 481 #endif
 482                 } else
 483                         off = 0;
 484 #elif defined(__arm__) && !defined(EFI)
 485                 /*
 486                  * The elf headers in arm kernels specify virtual addresses in
 487                  * all header fields, even the ones that should be physical
 488                  * addresses.  We assume the entry point is in the first page,
 489                  * and masking the page offset will leave us with the virtual
 490                  * address the kernel was linked at.  We subtract that from the
 491                  * load offset, making 'off' into the value which, when added
 492                  * to a virtual address in an elf header, translates it to a
 493                  * physical address.  We do the va->pa conversion on the entry
 494                  * point address in the header now, so that later we can launch
 495                  * the kernel by just jumping to that address.
 496                  *
 497                  * When booting from UEFI the copyin and copyout functions
 498                  * handle adjusting the location relative to the first virtual
 499                  * address.  Because of this there is no need to adjust the
 500                  * offset or entry point address as these will both be handled
 501                  * by the efi code.
 502                  */
 503                 off -= ehdr->e_entry & ~PAGE_MASK;
 504                 ehdr->e_entry += off;
 505 #ifdef ELF_VERBOSE
 506                 printf("ehdr->e_entry 0x%08x, va<->pa off %llx\n",
 507                     ehdr->e_entry, off);
 508 #endif
 509 #else
 510                 off = 0;        /* other archs use direct mapped kernels */
 511 #endif
 512         }
 513         ef->off = off;
 514
 515         if (ef->kernel)
 516                 __elfN(relocation_offset) = off;
 517
 518         if ((ehdr->e_phoff + ehdr->e_phnum * sizeof(*phdr)) > ef->firstlen) {
 519                 printf("elf" __XSTRING(__ELF_WORD_SIZE)
 520                     "_loadimage: program header not within first page\n");
 521                 goto out;
 522         }
 523         phdr = (Elf_Phdr *)(ef->firstpage + ehdr->e_phoff);
 524
 525         for (i = 0; i < ehdr->e_phnum; i++) {
 526                 if (elf_program_header_convert(ehdr, phdr))
 527                         continue;
 528
 529                 /* We want to load PT_LOAD segments only.. */
 530                 if (phdr[i].p_type != PT_LOAD)
 531                         continue;
 532
 533 #ifdef ELF_VERBOSE
 534                 printf("Segment: 0x%lx@0x%lx -> 0x%lx-0x%lx",
 535                     (long)phdr[i].p_filesz, (long)phdr[i].p_offset,
 536                     (long)(phdr[i].p_vaddr + off),
 537                     (long)(phdr[i].p_vaddr + off + phdr[i].p_memsz - 1));
 538 #else
 539                 if ((phdr[i].p_flags & PF_W) == 0) {
 540                         printf("text=0x%lx ", (long)phdr[i].p_filesz);
 541                 } else {
 542                         printf("data=0x%lx", (long)phdr[i].p_filesz);
 543                         if (phdr[i].p_filesz < phdr[i].p_memsz)
 544                                 printf("+0x%lx", (long)(phdr[i].p_memsz -
 545                                     phdr[i].p_filesz));
 546                         printf(" ");
 547                 }
 548 #endif
 549                 fpcopy = 0;
 550                 if (ef->firstlen > phdr[i].p_offset) {
 551                         fpcopy = ef->firstlen - phdr[i].p_offset;
 552                         archsw.arch_copyin(ef->firstpage + phdr[i].p_offset,
 553                             phdr[i].p_vaddr + off, fpcopy);
 554                 }
 555                 if (phdr[i].p_filesz > fpcopy) {
 556                         if (kern_pread(ef->fd, phdr[i].p_vaddr + off + fpcopy,
 557                             phdr[i].p_filesz - fpcopy,
 558                             phdr[i].p_offset + fpcopy) != 0) {
 559                                 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
 560                                     "_loadimage: read failed\n");
 561                                 goto out;
 562                         }
 563                 }
 564                 /* clear space from oversized segments; eg: bss */
 565                 if (phdr[i].p_filesz < phdr[i].p_memsz) {
 566 #ifdef ELF_VERBOSE
 567                         printf(" (bss: 0x%lx-0x%lx)",
 568                             (long)(phdr[i].p_vaddr + off + phdr[i].p_filesz),
 569                             (long)(phdr[i].p_vaddr + off + phdr[i].p_memsz -1));
 570 #endif
 571
 572                         kern_bzero(phdr[i].p_vaddr + off + phdr[i].p_filesz,
 573                             phdr[i].p_memsz - phdr[i].p_filesz);
 574                 }
 575 #ifdef ELF_VERBOSE
 576                 printf("\n");
 577 #endif
 578
 579                 if (archsw.arch_loadseg != NULL)
 580                         archsw.arch_loadseg(ehdr, phdr + i, off);
 581
 582                 if (firstaddr == 0 || firstaddr > (phdr[i].p_vaddr + off))
 583                         firstaddr = phdr[i].p_vaddr + off;
 584                 if (lastaddr == 0 || lastaddr <
 585                     (phdr[i].p_vaddr + off + phdr[i].p_memsz))
 586                         lastaddr = phdr[i].p_vaddr + off + phdr[i].p_memsz;
 587         }
 588         lastaddr = roundup(lastaddr, sizeof(long));
 589
 590         /*
 591          * Get the section headers.  We need this for finding the .ctors
 592          * section as well as for loading any symbols.  Both may be hard
 593          * to do if reading from a .gz file as it involves seeking.  I
 594          * think the rule is going to have to be that you must strip a
 595          * file to remove symbols before gzipping it.
 596          */
 597         chunk = (size_t)ehdr->e_shnum * (size_t)ehdr->e_shentsize;
 598         if (chunk == 0 || ehdr->e_shoff == 0)
 599                 goto nosyms;
 600         shdr = alloc_pread(ef->fd, ehdr->e_shoff, chunk);
 601         if (shdr == NULL) {
 602                 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
 603                     "_loadimage: failed to read section headers");
 604                 goto nosyms;
 605         }
 606
 607         for (i = 0; i < ehdr->e_shnum; i++)
 608                 elf_section_header_convert(ehdr, &shdr[i]);
 609
 610         file_addmetadata(fp, MODINFOMD_SHDR, chunk, shdr);
 611
 612         /*
 613          * Read the section string table and look for the .ctors section.
 614          * We need to tell the kernel where it is so that it can call the
 615          * ctors.
 616          */
 617         chunk = shdr[ehdr->e_shstrndx].sh_size;
 618         if (chunk) {
 619                 shstr = alloc_pread(ef->fd, shdr[ehdr->e_shstrndx].sh_offset,
 620                     chunk);
 621                 if (shstr) {
 622                         for (i = 0; i < ehdr->e_shnum; i++) {
 623                                 if (strcmp(shstr + shdr[i].sh_name,
 624                                     ".ctors") != 0)
 625                                         continue;
 626                                 ctors = shdr[i].sh_addr;
 627                                 file_addmetadata(fp, MODINFOMD_CTORS_ADDR,
 628                                     sizeof(ctors), &ctors);
 629                                 size = shdr[i].sh_size;
 630                                 file_addmetadata(fp, MODINFOMD_CTORS_SIZE,
 631                                     sizeof(size), &size);
 632                                 break;
 633                         }
 634                         free(shstr);
 635                 }
 636         }
 637
 638         /*
 639          * Now load any symbols.
 640          */
 641         symtabindex = -1;
 642         symstrindex = -1;
 643         for (i = 0; i < ehdr->e_shnum; i++) {
 644                 if (shdr[i].sh_type != SHT_SYMTAB)
 645                         continue;
 646                 for (j = 0; j < ehdr->e_phnum; j++) {
 647                         if (phdr[j].p_type != PT_LOAD)
 648                                 continue;
 649                         if (shdr[i].sh_offset >= phdr[j].p_offset &&
 650                             (shdr[i].sh_offset + shdr[i].sh_size <=
 651                             phdr[j].p_offset + phdr[j].p_filesz)) {
 652                                 shdr[i].sh_offset = 0;
 653                                 shdr[i].sh_size = 0;
 654                                 break;
 655                         }
 656                 }
 657                 if (shdr[i].sh_offset == 0 || shdr[i].sh_size == 0)
 658                         continue;       /* alread loaded in a PT_LOAD above */
 659                 /* Save it for loading below */
 660                 symtabindex = i;
 661                 symstrindex = shdr[i].sh_link;
 662         }
 663         if (symtabindex < 0 || symstrindex < 0)
 664                 goto nosyms;
 665
 666         /* Ok, committed to a load. */
 667 #ifndef ELF_VERBOSE
 668         printf("syms=[");
 669 #endif
 670         ssym = lastaddr;
 671         for (i = symtabindex; i >= 0; i = symstrindex) {
 672 #ifdef ELF_VERBOSE
 673                 char    *secname;
 674
 675                 switch(shdr[i].sh_type) {
 676                 case SHT_SYMTAB:                /* Symbol table */
 677                         secname = "symtab";
 678                         break;
 679                 case SHT_STRTAB:                /* String table */
 680                         secname = "strtab";
 681                         break;
 682                 default:
 683                         secname = "WHOA!!";
 684                         break;
 685                 }
 686 #endif
 687                 size = shdr[i].sh_size;
 688 #if defined(__powerpc__)
 689   #if __ELF_WORD_SIZE == 64
 690                 size = htobe64(size);
 691   #else
 692                 size = htobe32(size);
 693   #endif
 694 #endif
 695
 696                 archsw.arch_copyin(&size, lastaddr, sizeof(size));
 697                 lastaddr += sizeof(size);
 698
 699 #ifdef ELF_VERBOSE
 700                 printf("\n%s: 0x%jx@0x%jx -> 0x%jx-0x%jx", secname,
 701                     (uintmax_t)shdr[i].sh_size, (uintmax_t)shdr[i].sh_offset,
 702                     (uintmax_t)lastaddr,
 703                     (uintmax_t)(lastaddr + shdr[i].sh_size));
 704 #else
 705                 if (i == symstrindex)
 706                         printf("+");
 707                 printf("0x%lx+0x%lx", (long)sizeof(size), (long)size);
 708 #endif
 709
 710                 if (lseek(ef->fd, (off_t)shdr[i].sh_offset, SEEK_SET) == -1) {
 711                         printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
 712                            "_loadimage: could not seek for symbols - skipped!");
 713                         lastaddr = ssym;
 714                         ssym = 0;
 715                         goto nosyms;
 716                 }
 717                 result = archsw.arch_readin(ef->fd, lastaddr, shdr[i].sh_size);
 718                 if (result < 0 || (size_t)result != shdr[i].sh_size) {
 719                         printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
 720                             "_loadimage: could not read symbols - skipped! "
 721                             "(%ju != %ju)", (uintmax_t)result,
 722                             (uintmax_t)shdr[i].sh_size);
 723                         lastaddr = ssym;
 724                         ssym = 0;
 725                         goto nosyms;
 726                 }
 727                 /* Reset offsets relative to ssym */
 728                 lastaddr += shdr[i].sh_size;
 729                 lastaddr = roundup(lastaddr, sizeof(size));
 730                 if (i == symtabindex)
 731                         symtabindex = -1;
 732                 else if (i == symstrindex)
 733                         symstrindex = -1;
 734         }
 735         esym = lastaddr;
 736 #ifndef ELF_VERBOSE
 737         printf("]");
 738 #endif
 739
 740 #if defined(__powerpc__)
 741   /* On PowerPC we always need to provide BE data to the kernel */
 742   #if __ELF_WORD_SIZE == 64
 743         ssym = htobe64((uint64_t)ssym);
 744         esym = htobe64((uint64_t)esym);
 745   #else
 746         ssym = htobe32((uint32_t)ssym);
 747         esym = htobe32((uint32_t)esym);
 748   #endif
 749 #endif
 750
 751         file_addmetadata(fp, MODINFOMD_SSYM, sizeof(ssym), &ssym);
 752         file_addmetadata(fp, MODINFOMD_ESYM, sizeof(esym), &esym);
 753
 754 nosyms:
 755         printf("\n");
 756
 757         ret = lastaddr - firstaddr;
 758         fp->f_addr = firstaddr;
 759
 760         php = NULL;
 761         for (i = 0; i < ehdr->e_phnum; i++) {
 762                 if (phdr[i].p_type == PT_DYNAMIC) {
 763                         php = phdr + i;
 764                         adp = php->p_vaddr;
 765                         file_addmetadata(fp, MODINFOMD_DYNAMIC, sizeof(adp),
 766                             &adp);
 767                         break;
 768                 }
 769         }
 770
 771         if (php == NULL) /* this is bad, we cannot get to symbols or _DYNAMIC */
 772                 goto out;
 773
 774         ndp = php->p_filesz / sizeof(Elf_Dyn);
 775         if (ndp == 0)
 776                 goto out;
 777         dp = malloc(php->p_filesz);
 778         if (dp == NULL)
 779                 goto out;
 780         archsw.arch_copyout(php->p_vaddr + off, dp, php->p_filesz);
 781
 782         ef->strsz = 0;
 783         for (i = 0; i < ndp; i++) {
 784                 if (dp[i].d_tag == 0)
 785                         break;
 786                 switch (dp[i].d_tag) {
 787                 case DT_HASH:
 788                         ef->hashtab =
 789                             (Elf_Hashelt*)(uintptr_t)(dp[i].d_un.d_ptr + off);
 790                         break;
 791                 case DT_STRTAB:
 792                         ef->strtab =
 793                             (char *)(uintptr_t)(dp[i].d_un.d_ptr + off);
 794                         break;
 795                 case DT_STRSZ:
 796                         ef->strsz = dp[i].d_un.d_val;
 797                         break;
 798                 case DT_SYMTAB:
 799                         ef->symtab =
 800                             (Elf_Sym *)(uintptr_t)(dp[i].d_un.d_ptr + off);
 801                         break;
 802                 case DT_REL:
 803                         ef->rel =
 804                             (Elf_Rel *)(uintptr_t)(dp[i].d_un.d_ptr + off);
 805                         break;
 806                 case DT_RELSZ:
 807                         ef->relsz = dp[i].d_un.d_val;
 808                         break;
 809                 case DT_RELA:
 810                         ef->rela =
 811                             (Elf_Rela *)(uintptr_t)(dp[i].d_un.d_ptr + off);
 812                         break;
 813                 case DT_RELASZ:
 814                         ef->relasz = dp[i].d_un.d_val;
 815                         break;
 816                 default:
 817                         break;
 818                 }
 819         }
 820         if (ef->hashtab == NULL || ef->symtab == NULL ||
 821             ef->strtab == NULL || ef->strsz == 0)
 822                 goto out;
 823         COPYOUT(ef->hashtab, &ef->nbuckets, sizeof(ef->nbuckets));
 824         COPYOUT(ef->hashtab + 1, &ef->nchains, sizeof(ef->nchains));
 825         ef->buckets = ef->hashtab + 2;
 826         ef->chains = ef->buckets + ef->nbuckets;
 827
 828         if (__elfN(lookup_symbol)(fp, ef, "__start_set_modmetadata_set",
 829             &sym) != 0)
 830                 return 0;
 831         p_start = sym.st_value + ef->off;
 832         if (__elfN(lookup_symbol)(fp, ef, "__stop_set_modmetadata_set",
 833             &sym) != 0)
 834                 return ENOENT;
 835         p_end = sym.st_value + ef->off;
 836
 837         if (__elfN(parse_modmetadata)(fp, ef, p_start, p_end) == 0)
 838                 goto out;
 839
 840         if (ef->kernel)         /* kernel must not depend on anything */
 841                 goto out;
 842
 843 out:
 844         if (dp)
 845                 free(dp);
 846         if (shdr)
 847                 free(shdr);
 848         return ret;
 849 }
 850
 851 static char invalid_name[] = "bad";
 852
 853 char *
 854 fake_modname(const char *name)
 855 {
 856         const char *sp, *ep;
 857         char *fp;
 858         size_t len;
 859
 860         sp = strrchr(name, '/');
 861         if (sp)
 862                 sp++;
 863         else
 864                 sp = name;
 865         ep = strrchr(name, '.');
 866         if (ep) {
 867                 if (ep == name) {
 868                         sp = invalid_name;
 869                         ep = invalid_name + sizeof(invalid_name) - 1;
 870                 }
 871         } else
 872                 ep = name + strlen(name);
 873         len = ep - sp;
 874         fp = malloc(len + 1);
 875         if (fp == NULL)
 876                 return NULL;
 877         memcpy(fp, sp, len);
 878         fp[len] = '\0';
 879         return fp;
 880 }
 881
 882 #if (defined(__i386__) || defined(__powerpc__)) && __ELF_WORD_SIZE == 64
 883 struct mod_metadata64 {
 884         int             md_version;     /* structure version MDTV_* */
 885         int             md_type;        /* type of entry MDT_* */
 886         uint64_t        md_data;        /* specific data */
 887         uint64_t        md_cval;        /* common string label */
 888 };
 889 #endif
 890 #if defined(__amd64__) && __ELF_WORD_SIZE == 32
 891 struct mod_metadata32 {
 892         int             md_version;     /* structure version MDTV_* */
 893         int             md_type;        /* type of entry MDT_* */
 894         uint32_t        md_data;        /* specific data */
 895         uint32_t        md_cval;        /* common string label */
 896 };
 897 #endif
 898
 899 int
 900 __elfN(load_modmetadata)(struct preloaded_file *fp, uint64_t dest)
 901 {
 902         struct elf_file          ef;
 903         int                      err, i, j;
 904         Elf_Shdr                *sh_meta, *shdr = NULL;
 905         Elf_Shdr                *sh_data[2];
 906         char                    *shstrtab = NULL;
 907         size_t                   size;
 908         Elf_Addr                 p_start, p_end;
 909
 910         bzero(&ef, sizeof(struct elf_file));
 911         ef.fd = -1;
 912
 913         err = __elfN(load_elf_header)(fp->f_name, &ef);
 914         if (err != 0)
 915                 goto out;
 916
 917         if (ef.kernel == 1 || ef.ehdr->e_type == ET_EXEC) {
 918                 ef.kernel = 1;
 919         } else if (ef.ehdr->e_type != ET_DYN) {
 920                 err = EFTYPE;
 921                 goto out;
 922         }
 923
 924         size = (size_t)ef.ehdr->e_shnum * (size_t)ef.ehdr->e_shentsize;
 925         shdr = alloc_pread(ef.fd, ef.ehdr->e_shoff, size);
 926         if (shdr == NULL) {
 927                 err = ENOMEM;
 928                 goto out;
 929         }
 930
 931         /* Load shstrtab. */
 932         shstrtab = alloc_pread(ef.fd, shdr[ef.ehdr->e_shstrndx].sh_offset,
 933             shdr[ef.ehdr->e_shstrndx].sh_size);
 934         if (shstrtab == NULL) {
 935                 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
 936                     "load_modmetadata: unable to load shstrtab\n");
 937                 err = EFTYPE;
 938                 goto out;
 939         }
 940
 941         /* Find set_modmetadata_set and data sections. */
 942         sh_data[0] = sh_data[1] = sh_meta = NULL;
 943         for (i = 0, j = 0; i < ef.ehdr->e_shnum; i++) {
 944                 if (strcmp(&shstrtab[shdr[i].sh_name],
 945                     "set_modmetadata_set") == 0) {
 946                         sh_meta = &shdr[i];
 947                 }
 948                 if ((strcmp(&shstrtab[shdr[i].sh_name], ".data") == 0) ||
 949                     (strcmp(&shstrtab[shdr[i].sh_name], ".rodata") == 0)) {
 950                         sh_data[j++] = &shdr[i];
 951                 }
 952         }
 953         if (sh_meta == NULL || sh_data[0] == NULL || sh_data[1] == NULL) {
 954                 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
 955     "load_modmetadata: unable to find set_modmetadata_set or data sections\n");
 956                 err = EFTYPE;
 957                 goto out;
 958         }
 959
 960         /* Load set_modmetadata_set into memory */
 961         err = kern_pread(ef.fd, dest, sh_meta->sh_size, sh_meta->sh_offset);
 962         if (err != 0) {
 963                 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
 964     "load_modmetadata: unable to load set_modmetadata_set: %d\n", err);
 965                 goto out;
 966         }
 967         p_start = dest;
 968         p_end = dest + sh_meta->sh_size;
 969         dest += sh_meta->sh_size;
 970
 971         /* Load data sections into memory. */
 972         err = kern_pread(ef.fd, dest, sh_data[0]->sh_size,
 973             sh_data[0]->sh_offset);
 974         if (err != 0) {
 975                 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
 976                     "load_modmetadata: unable to load data: %d\n", err);
 977                 goto out;
 978         }
 979
 980         /*
 981          * We have to increment the dest, so that the offset is the same into
 982          * both the .rodata and .data sections.
 983          */
 984         ef.off = -(sh_data[0]->sh_addr - dest);
 985         dest += (sh_data[1]->sh_addr - sh_data[0]->sh_addr);
 986
 987         err = kern_pread(ef.fd, dest, sh_data[1]->sh_size,
 988             sh_data[1]->sh_offset);
 989         if (err != 0) {
 990                 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
 991                     "load_modmetadata: unable to load data: %d\n", err);
 992                 goto out;
 993         }
 994
 995         err = __elfN(parse_modmetadata)(fp, &ef, p_start, p_end);
 996         if (err != 0) {
 997                 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
 998                     "load_modmetadata: unable to parse metadata: %d\n", err);
 999                 goto out;
1000         }
1001
1002 out:
1003         if (shstrtab != NULL)
1004                 free(shstrtab);
1005         if (shdr != NULL)
1006                 free(shdr);
1007         if (ef.firstpage != NULL)
1008                 free(ef.firstpage);
1009         if (ef.fd != -1)
1010                 close(ef.fd);
1011         return (err);
1012 }
1013
1014 int
1015 __elfN(parse_modmetadata)(struct preloaded_file *fp, elf_file_t ef,
1016     Elf_Addr p_start, Elf_Addr p_end)
1017 {
1018         struct mod_metadata md;
1019 #if (defined(__i386__) || defined(__powerpc__)) && __ELF_WORD_SIZE == 64
1020         struct mod_metadata64 md64;
1021 #elif defined(__amd64__) && __ELF_WORD_SIZE == 32
1022         struct mod_metadata32 md32;
1023 #endif
1024         struct mod_depend *mdepend;
1025         struct mod_version mver;
1026         char *s;
1027         int error, modcnt, minfolen;
1028         Elf_Addr v, p;
1029
1030         modcnt = 0;
1031         p = p_start;
1032         while (p < p_end) {
1033                 COPYOUT(p, &v, sizeof(v));
1034                 error = __elfN(reloc_ptr)(fp, ef, p, &v, sizeof(v));
1035                 if (error == EOPNOTSUPP)
1036                         v += ef->off;
1037                 else if (error != 0)
1038                         return (error);
1039 #if (defined(__i386__) || defined(__powerpc__)) && __ELF_WORD_SIZE == 64
1040                 COPYOUT(v, &md64, sizeof(md64));
1041                 error = __elfN(reloc_ptr)(fp, ef, v, &md64, sizeof(md64));
1042                 if (error == EOPNOTSUPP) {
1043                         md64.md_cval += ef->off;
1044                         md64.md_data += ef->off;
1045                 } else if (error != 0)
1046                         return (error);
1047                 md.md_version = md64.md_version;
1048                 md.md_type = md64.md_type;
1049                 md.md_cval = (const char *)(uintptr_t)md64.md_cval;
1050                 md.md_data = (void *)(uintptr_t)md64.md_data;
1051 #elif defined(__amd64__) && __ELF_WORD_SIZE == 32
1052                 COPYOUT(v, &md32, sizeof(md32));
1053                 error = __elfN(reloc_ptr)(fp, ef, v, &md32, sizeof(md32));
1054                 if (error == EOPNOTSUPP) {
1055                         md32.md_cval += ef->off;
1056                         md32.md_data += ef->off;
1057                 } else if (error != 0)
1058                         return (error);
1059                 md.md_version = md32.md_version;
1060                 md.md_type = md32.md_type;
1061                 md.md_cval = (const char *)(uintptr_t)md32.md_cval;
1062                 md.md_data = (void *)(uintptr_t)md32.md_data;
1063 #else
1064                 COPYOUT(v, &md, sizeof(md));
1065                 error = __elfN(reloc_ptr)(fp, ef, v, &md, sizeof(md));
1066                 if (error == EOPNOTSUPP) {
1067                         md.md_cval += ef->off;
1068                         md.md_data = (void *)((uintptr_t)md.md_data +
1069                             (uintptr_t)ef->off);
1070                 } else if (error != 0)
1071                         return (error);
1072 #endif
1073                 p += sizeof(Elf_Addr);
1074                 switch(md.md_type) {
1075                 case MDT_DEPEND:
1076                         if (ef->kernel) /* kernel must not depend on anything */
1077                                 break;
1078                         s = strdupout((vm_offset_t)md.md_cval);
1079                         minfolen = sizeof(*mdepend) + strlen(s) + 1;
1080                         mdepend = malloc(minfolen);
1081                         if (mdepend == NULL)
1082                                 return ENOMEM;
1083                         COPYOUT((vm_offset_t)md.md_data, mdepend,
1084                             sizeof(*mdepend));
1085                         strcpy((char*)(mdepend + 1), s);
1086                         free(s);
1087                         file_addmetadata(fp, MODINFOMD_DEPLIST, minfolen,
1088                             mdepend);
1089                         free(mdepend);
1090                         break;
1091                 case MDT_VERSION:
1092                         s = strdupout((vm_offset_t)md.md_cval);
1093                         COPYOUT((vm_offset_t)md.md_data, &mver, sizeof(mver));
1094                         file_addmodule(fp, s, mver.mv_version, NULL);
1095                         free(s);
1096                         modcnt++;
1097                         break;
1098                 }
1099         }
1100         if (modcnt == 0) {
1101                 s = fake_modname(fp->f_name);
1102                 file_addmodule(fp, s, 1, NULL);
1103                 free(s);
1104         }
1105         return 0;
1106 }
1107
1108 static unsigned long
1109 elf_hash(const char *name)
1110 {
1111         const unsigned char *p = (const unsigned char *) name;
1112         unsigned long h = 0;
1113         unsigned long g;
1114
1115         while (*p != '\0') {
1116                 h = (h << 4) + *p++;
1117                 if ((g = h & 0xf0000000) != 0)
1118                         h ^= g >> 24;
1119                 h &= ~g;
1120         }
1121         return h;
1122 }
1123
1124 static const char __elfN(bad_symtable)[] = "elf" __XSTRING(__ELF_WORD_SIZE)
1125     "_lookup_symbol: corrupt symbol table\n";
1126 int
1127 __elfN(lookup_symbol)(struct preloaded_file *fp, elf_file_t ef,
1128     const char* name, Elf_Sym *symp)
1129 {
1130         Elf_Hashelt symnum;
1131         Elf_Sym sym;
1132         char *strp;
1133         unsigned long hash;
1134
1135         hash = elf_hash(name);
1136         COPYOUT(&ef->buckets[hash % ef->nbuckets], &symnum, sizeof(symnum));
1137
1138         while (symnum != STN_UNDEF) {
1139                 if (symnum >= ef->nchains) {
1140                         printf(__elfN(bad_symtable));
1141                         return ENOENT;
1142                 }
1143
1144                 COPYOUT(ef->symtab + symnum, &sym, sizeof(sym));
1145                 if (sym.st_name == 0) {
1146                         printf(__elfN(bad_symtable));
1147                         return ENOENT;
1148                 }
1149
1150                 strp = strdupout((vm_offset_t)(ef->strtab + sym.st_name));
1151                 if (strcmp(name, strp) == 0) {
1152                         free(strp);
1153                         if (sym.st_shndx != SHN_UNDEF ||
1154                             (sym.st_value != 0 &&
1155                             ELF_ST_TYPE(sym.st_info) == STT_FUNC)) {
1156                                 *symp = sym;
1157                                 return 0;
1158                         }
1159                         return ENOENT;
1160                 }
1161                 free(strp);
1162                 COPYOUT(&ef->chains[symnum], &symnum, sizeof(symnum));
1163         }
1164         return ENOENT;
1165 }
1166
1167 /*
1168  * Apply any intra-module relocations to the value. p is the load address
1169  * of the value and val/len is the value to be modified. This does NOT modify
1170  * the image in-place, because this is done by kern_linker later on.
1171  *
1172  * Returns EOPNOTSUPP if no relocation method is supplied.
1173  */
1174 static int
1175 __elfN(reloc_ptr)(struct preloaded_file *mp, elf_file_t ef,
1176     Elf_Addr p, void *val, size_t len)
1177 {
1178         size_t n;
1179         Elf_Rela a;
1180         Elf_Rel r;
1181         int error;
1182
1183         /*
1184          * The kernel is already relocated, but we still want to apply
1185          * offset adjustments.
1186          */
1187         if (ef->kernel)
1188                 return (EOPNOTSUPP);
1189
1190         for (n = 0; n < ef->relsz / sizeof(r); n++) {
1191                 COPYOUT(ef->rel + n, &r, sizeof(r));
1192
1193                 error = __elfN(reloc)(ef, __elfN(symaddr), &r, ELF_RELOC_REL,
1194                     ef->off, p, val, len);
1195                 if (error != 0)
1196                         return (error);
1197         }
1198         for (n = 0; n < ef->relasz / sizeof(a); n++) {
1199                 COPYOUT(ef->rela + n, &a, sizeof(a));
1200
1201                 error = __elfN(reloc)(ef, __elfN(symaddr), &a, ELF_RELOC_RELA,
1202                     ef->off, p, val, len);
1203                 if (error != 0)
1204                         return (error);
1205         }
1206
1207         return (0);
1208 }
1209
1210 static Elf_Addr
1211 __elfN(symaddr)(struct elf_file *ef, Elf_Size symidx)
1212 {
1213
1214         /* Symbol lookup by index not required here. */
1215         return (0);
1216 }