sys/kern/link_elf_obj.c

   1 /*-
   2  * Copyright (c) 1998 Doug Rabson
   3  * Copyright (c) 2004 Peter Wemm
   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  * $FreeBSD: src/sys/kern/link_elf.c,v 1.24 1999/12/24 15:33:36 bde Exp $
  28  * $DragonFly: src/sys/kern/link_elf.c,v 1.29 2008/08/01 23:11:16 dillon Exp $
  29  */
  30
  31 #include <sys/param.h>
  32 #include <sys/kernel.h>
  33 #include <sys/systm.h>
  34 #include <sys/malloc.h>
  35 #include <sys/proc.h>
  36 #include <sys/nlookup.h>
  37 #include <sys/fcntl.h>
  38 #include <sys/vnode.h>
  39 #include <sys/linker.h>
  40 #include <machine/elf.h>
  41
  42 #include <vm/vm.h>
  43 #include <vm/vm_param.h>
  44 #include <vm/vm_zone.h>
  45 #include <vm/vm_object.h>
  46 #include <vm/vm_kern.h>
  47 #include <vm/vm_extern.h>
  48 #include <sys/lock.h>
  49 #include <vm/pmap.h>
  50 #include <vm/vm_map.h>
  51
  52 static int      link_elf_obj_preload_file(const char *, linker_file_t *);
  53 static int      link_elf_obj_preload_finish(linker_file_t);
  54 static int      link_elf_obj_load_file(const char *, linker_file_t *);
  55 static int
  56 link_elf_obj_lookup_symbol(linker_file_t, const char *,
  57                        c_linker_sym_t *);
  58 static int      link_elf_obj_symbol_values(linker_file_t, c_linker_sym_t, linker_symval_t *);
  59 static int
  60 link_elf_obj_search_symbol(linker_file_t, caddr_t value,
  61                        c_linker_sym_t * sym, long *diffp);
  62
  63 static void     link_elf_obj_unload_file(linker_file_t);
  64 static int
  65 link_elf_obj_lookup_set(linker_file_t, const char *,
  66                     void ***, void ***, int *);
  67 static void     link_elf_obj_reloc_local(linker_file_t lf);
  68 static int elf_obj_lookup(linker_file_t lf, Elf_Size symidx, int deps, Elf_Addr *);
  69
  70 static struct linker_class_ops link_elf_obj_class_ops = {
  71         link_elf_obj_load_file,
  72         link_elf_obj_preload_file,
  73 };
  74
  75 static struct linker_file_ops link_elf_obj_file_ops = {
  76         .lookup_symbol = link_elf_obj_lookup_symbol,
  77         .symbol_values = link_elf_obj_symbol_values,
  78         .search_symbol = link_elf_obj_search_symbol,
  79         .preload_finish = link_elf_obj_preload_finish,
  80         .unload = link_elf_obj_unload_file,
  81         .lookup_set = link_elf_obj_lookup_set,
  82 };
  83
  84 typedef struct {
  85         void           *addr;
  86         Elf_Off         size;
  87         int             flags;
  88         int             sec;            /* Original section */
  89         char           *name;
  90 }               Elf_progent;
  91
  92 typedef struct {
  93         Elf_Rel        *rel;
  94         int             nrel;
  95         int             sec;
  96 }               Elf_relent;
  97
  98 typedef struct {
  99         Elf_Rela       *rela;
 100         int             nrela;
 101         int             sec;
 102 }               Elf_relaent;
 103
 104
 105 typedef struct elf_file {
 106         int             preloaded;
 107
 108         caddr_t         address;        /* Relocation address */
 109         size_t          bytes;          /* Chunk size in bytes */
 110         vm_object_t     object;         /* VM object to hold file pages */
 111         Elf_Shdr       *e_shdr;
 112
 113         Elf_progent    *progtab;
 114         int             nprogtab;
 115
 116         Elf_relaent    *relatab;
 117         int             nrelatab;
 118
 119         Elf_relent     *reltab;
 120         int             nreltab;
 121
 122         Elf_Sym        *ddbsymtab;      /* The symbol table we are using */
 123         long            ddbsymcnt;      /* Number of symbols */
 124         caddr_t         ddbstrtab;      /* String table */
 125         long            ddbstrcnt;      /* number of bytes in string table */
 126
 127         caddr_t         shstrtab;       /* Section name string table */
 128         long            shstrcnt;       /* number of bytes in string table */
 129
 130         caddr_t         ctftab;         /* CTF table */
 131         long            ctfcnt;         /* number of bytes in CTF table */
 132         caddr_t         ctfoff;         /* CTF offset table */
 133         caddr_t         typoff;         /* Type offset table */
 134         long            typlen;         /* Number of type entries. */
 135
 136 }              *elf_file_t;
 137
 138 static int      relocate_file(linker_file_t lf);
 139
 140 /*
 141  * The kernel symbol table starts here.
 142  */
 143 extern struct _dynamic _DYNAMIC;
 144
 145 static void
 146 link_elf_obj_init(void *arg)
 147 {
 148 #if ELF_TARG_CLASS == ELFCLASS32
 149         linker_add_class("elf32", NULL, &link_elf_obj_class_ops);
 150 #else
 151         linker_add_class("elf64", NULL, &link_elf_obj_class_ops);
 152 #endif
 153 }
 154
 155 SYSINIT(link_elf, SI_BOOT2_KLD, SI_ORDER_SECOND, link_elf_obj_init, 0);
 156
 157 static void
 158 link_elf_obj_error(const char *file, const char *s)
 159 {
 160         kprintf("kldload: %s: %s\n", file, s);
 161 }
 162
 163 static int
 164 link_elf_obj_preload_file(const char *filename, linker_file_t *result)
 165 {
 166         Elf_Ehdr       *hdr;
 167         Elf_Shdr       *shdr;
 168         Elf_Sym *es;
 169         caddr_t         modptr, baseptr, sizeptr;
 170         char           *type;
 171         elf_file_t      ef;
 172         linker_file_t   lf;
 173         Elf_Addr        off;
 174         int             error, i, j, pb, ra, rl, shstrindex, symstrindex, symtabindex;
 175
 176         /*
 177          * Look to see if we have the module preloaded.
 178          */
 179         modptr = preload_search_by_name(filename);
 180         if (modptr == NULL)
 181                 return ENOENT;
 182
 183         /* It's preloaded, check we can handle it and collect information */
 184         type = (char *)preload_search_info(modptr, MODINFO_TYPE);
 185         baseptr = preload_search_info(modptr, MODINFO_ADDR);
 186         sizeptr = preload_search_info(modptr, MODINFO_SIZE);
 187         hdr = (Elf_Ehdr *) preload_search_info(modptr, MODINFO_METADATA |
 188                                                MODINFOMD_ELFHDR);
 189         shdr = (Elf_Shdr *) preload_search_info(modptr, MODINFO_METADATA |
 190                                                 MODINFOMD_SHDR);
 191         if (type == NULL ||
 192             (strcmp(type, "elf" __XSTRING(__ELF_WORD_SIZE) " obj module") != 0 &&
 193              strcmp(type, "elf obj module") != 0)) {
 194                 return (EFTYPE);
 195         }
 196         if (baseptr == NULL || sizeptr == NULL || hdr == NULL || shdr == NULL)
 197                 return (EINVAL);
 198
 199         ef = kmalloc(sizeof(struct elf_file), M_LINKER, M_WAITOK | M_ZERO);
 200         ef->preloaded = 1;
 201         ef->address = *(caddr_t *) baseptr;
 202         ef->bytes = 0;
 203         lf = linker_make_file(filename, ef, &link_elf_obj_file_ops);
 204         if (lf == NULL) {
 205                 kfree(ef, M_LINKER);
 206                 return ENOMEM;
 207         }
 208         lf->address = ef->address;
 209         lf->size = *(size_t *) sizeptr;
 210
 211         if (hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS ||
 212             hdr->e_ident[EI_DATA] != ELF_TARG_DATA ||
 213             hdr->e_ident[EI_VERSION] != EV_CURRENT ||
 214             hdr->e_version != EV_CURRENT ||
 215             hdr->e_type != ET_REL ||
 216             hdr->e_machine != ELF_TARG_MACH) {
 217                 error = EFTYPE;
 218                 goto out;
 219         }
 220         ef->e_shdr = shdr;
 221
 222         /* Scan the section header for information and table sizing. */
 223         symtabindex = -1;
 224         symstrindex = -1;
 225         for (i = 0; i < hdr->e_shnum; i++) {
 226                 switch (shdr[i].sh_type) {
 227                 case SHT_PROGBITS:
 228                 case SHT_NOBITS:
 229                         ef->nprogtab++;
 230                         break;
 231                 case SHT_SYMTAB:
 232                         symtabindex = i;
 233                         symstrindex = shdr[i].sh_link;
 234                         break;
 235                 case SHT_REL:
 236                         ef->nreltab++;
 237                         break;
 238                 case SHT_RELA:
 239                         ef->nrelatab++;
 240                         break;
 241                 }
 242         }
 243
 244         shstrindex = hdr->e_shstrndx;
 245         if (ef->nprogtab == 0 || symstrindex < 0 ||
 246             symstrindex >= hdr->e_shnum ||
 247             shdr[symstrindex].sh_type != SHT_STRTAB || shstrindex == 0 ||
 248             shstrindex >= hdr->e_shnum ||
 249             shdr[shstrindex].sh_type != SHT_STRTAB) {
 250                 error = ENOEXEC;
 251                 goto out;
 252         }
 253         /* Allocate space for tracking the load chunks */
 254         if (ef->nprogtab != 0)
 255                 ef->progtab = kmalloc(ef->nprogtab * sizeof(*ef->progtab),
 256                                      M_LINKER, M_WAITOK | M_ZERO);
 257         if (ef->nreltab != 0)
 258                 ef->reltab = kmalloc(ef->nreltab * sizeof(*ef->reltab),
 259                                     M_LINKER, M_WAITOK | M_ZERO);
 260         if (ef->nrelatab != 0)
 261                 ef->relatab = kmalloc(ef->nrelatab * sizeof(*ef->relatab),
 262                                      M_LINKER, M_WAITOK | M_ZERO);
 263         if ((ef->nprogtab != 0 && ef->progtab == NULL) ||
 264             (ef->nreltab != 0 && ef->reltab == NULL) ||
 265             (ef->nrelatab != 0 && ef->relatab == NULL)) {
 266                 error = ENOMEM;
 267                 goto out;
 268         }
 269         /* XXX, relocate the sh_addr fields saved by the loader. */
 270         off = 0;
 271         for (i = 0; i < hdr->e_shnum; i++) {
 272                 if (shdr[i].sh_addr != 0 && (off == 0 || shdr[i].sh_addr < off))
 273                         off = shdr[i].sh_addr;
 274         }
 275         for (i = 0; i < hdr->e_shnum; i++) {
 276                 if (shdr[i].sh_addr != 0)
 277                         shdr[i].sh_addr = shdr[i].sh_addr - off +
 278                                 (Elf_Addr) ef->address;
 279         }
 280
 281         ef->ddbsymcnt = shdr[symtabindex].sh_size / sizeof(Elf_Sym);
 282         ef->ddbsymtab = (Elf_Sym *) shdr[symtabindex].sh_addr;
 283         ef->ddbstrcnt = shdr[symstrindex].sh_size;
 284         ef->ddbstrtab = (char *)shdr[symstrindex].sh_addr;
 285         ef->shstrcnt = shdr[shstrindex].sh_size;
 286         ef->shstrtab = (char *)shdr[shstrindex].sh_addr;
 287
 288         /* Now fill out progtab and the relocation tables. */
 289         pb = 0;
 290         rl = 0;
 291         ra = 0;
 292         for (i = 0; i < hdr->e_shnum; i++) {
 293                 switch (shdr[i].sh_type) {
 294                 case SHT_PROGBITS:
 295                 case SHT_NOBITS:
 296                         ef->progtab[pb].addr = (void *)shdr[i].sh_addr;
 297                         if (shdr[i].sh_type == SHT_PROGBITS)
 298                                 ef->progtab[pb].name = "<<PROGBITS>>";
 299                         else
 300                                 ef->progtab[pb].name = "<<NOBITS>>";
 301                         ef->progtab[pb].size = shdr[i].sh_size;
 302                         ef->progtab[pb].sec = i;
 303                         if (ef->shstrtab && shdr[i].sh_name != 0)
 304                                 ef->progtab[pb].name =
 305                                         ef->shstrtab + shdr[i].sh_name;
 306 #if 0
 307                         if (ef->progtab[pb].name != NULL &&
 308                             !strcmp(ef->progtab[pb].name, "set_pcpu")) {
 309                                 void           *dpcpu;
 310
 311                                 dpcpu = dpcpu_alloc(shdr[i].sh_size);
 312                                 if (dpcpu == NULL) {
 313                                         error = ENOSPC;
 314                                         goto out;
 315                                 }
 316                                 memcpy(dpcpu, ef->progtab[pb].addr,
 317                                        ef->progtab[pb].size);
 318                                 dpcpu_copy(dpcpu, shdr[i].sh_size);
 319                                 ef->progtab[pb].addr = dpcpu;
 320 #ifdef VIMAGE
 321                         } else if (ef->progtab[pb].name != NULL &&
 322                                    !strcmp(ef->progtab[pb].name, VNET_SETNAME)) {
 323                                 void           *vnet_data;
 324
 325                                 vnet_data = vnet_data_alloc(shdr[i].sh_size);
 326                                 if (vnet_data == NULL) {
 327                                         error = ENOSPC;
 328                                         goto out;
 329                                 }
 330                                 memcpy(vnet_data, ef->progtab[pb].addr,
 331                                        ef->progtab[pb].size);
 332                                 vnet_data_copy(vnet_data, shdr[i].sh_size);
 333                                 ef->progtab[pb].addr = vnet_data;
 334 #endif
 335                         }
 336 #endif
 337                         /* Update all symbol values with the offset. */
 338                         for (j = 0; j < ef->ddbsymcnt; j++) {
 339                                 es = &ef->ddbsymtab[j];
 340                                 if (es->st_shndx != i)
 341                                         continue;
 342                                 es->st_value += (Elf_Addr) ef->progtab[pb].addr;
 343                         }
 344                         pb++;
 345                         break;
 346                 case SHT_REL:
 347                         ef->reltab[rl].rel = (Elf_Rel *) shdr[i].sh_addr;
 348                         ef->reltab[rl].nrel = shdr[i].sh_size / sizeof(Elf_Rel);
 349                         ef->reltab[rl].sec = shdr[i].sh_info;
 350                         rl++;
 351                         break;
 352                 case SHT_RELA:
 353                         ef->relatab[ra].rela = (Elf_Rela *) shdr[i].sh_addr;
 354                         ef->relatab[ra].nrela =
 355                                 shdr[i].sh_size / sizeof(Elf_Rela);
 356                         ef->relatab[ra].sec = shdr[i].sh_info;
 357                         ra++;
 358                         break;
 359                 }
 360         }
 361         if (pb != ef->nprogtab)
 362                 panic("lost progbits");
 363         if (rl != ef->nreltab)
 364                 panic("lost reltab");
 365         if (ra != ef->nrelatab)
 366                 panic("lost relatab");
 367
 368         /* Local intra-module relocations */
 369         link_elf_obj_reloc_local(lf);
 370
 371         *result = lf;
 372         return (0);
 373
 374 out:
 375         /* preload not done this way */
 376         linker_file_unload(lf /* , LINKER_UNLOAD_FORCE */ );
 377         return (error);
 378 }
 379
 380 static int
 381 link_elf_obj_preload_finish(linker_file_t lf)
 382 {
 383         int error;
 384
 385         error = relocate_file(lf);
 386
 387         return (error);
 388 }
 389
 390 static int
 391 link_elf_obj_load_file(const char *filename, linker_file_t * result)
 392 {
 393         struct nlookupdata nd;
 394         struct thread  *td = curthread; /* XXX */
 395         struct proc    *p = td->td_proc;
 396         char           *pathname;
 397         struct vnode   *vp;
 398         Elf_Ehdr       *hdr;
 399         Elf_Shdr       *shdr;
 400         Elf_Sym        *es;
 401         int             nbytes, i, j;
 402         vm_offset_t     mapbase;
 403         size_t          mapsize;
 404         int             error = 0;
 405         int             resid;
 406         elf_file_t      ef;
 407         linker_file_t   lf;
 408         int             symtabindex;
 409         int             symstrindex;
 410         int             shstrindex;
 411         int             nsym;
 412         int             pb, rl, ra;
 413         int             alignmask;
 414
 415         /* XXX Hack for firmware loading where p == NULL */
 416         if (p == NULL) {
 417                 p = &proc0;
 418         }
 419
 420         KKASSERT(p != NULL);
 421         if (p->p_ucred == NULL) {
 422                 kprintf("link_elf_obj_load_file: cannot load '%s' from filesystem"
 423                         " this early\n", filename);
 424                 return ENOENT;
 425         }
 426         shdr = NULL;
 427         lf = NULL;
 428         mapsize = 0;
 429         hdr = NULL;
 430         pathname = linker_search_path(filename);
 431         if (pathname == NULL)
 432                 return ENOENT;
 433
 434         error = nlookup_init(&nd, pathname, UIO_SYSSPACE, NLC_FOLLOW | NLC_LOCKVP);
 435         if (error == 0)
 436                 error = vn_open(&nd, NULL, FREAD, 0);
 437         kfree(pathname, M_LINKER);
 438         if (error) {
 439                 nlookup_done(&nd);
 440                 return error;
 441         }
 442         vp = nd.nl_open_vp;
 443         nd.nl_open_vp = NULL;
 444         nlookup_done(&nd);
 445
 446         /*
 447          * Read the elf header from the file.
 448          */
 449         hdr = kmalloc(sizeof(*hdr), M_LINKER, M_WAITOK);
 450         if (hdr == NULL) {
 451                 error = ENOMEM;
 452                 goto out;
 453         }
 454         error = vn_rdwr(UIO_READ, vp, (void *)hdr, sizeof(*hdr), 0,
 455                         UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
 456         if (error)
 457                 goto out;
 458         if (resid != 0) {
 459                 error = ENOEXEC;
 460                 goto out;
 461         }
 462         if (!IS_ELF(*hdr)) {
 463                 error = ENOEXEC;
 464                 goto out;
 465         }
 466
 467         if (hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS
 468             || hdr->e_ident[EI_DATA] != ELF_TARG_DATA) {
 469                 link_elf_obj_error(filename, "Unsupported file layout");
 470                 error = ENOEXEC;
 471                 goto out;
 472         }
 473         if (hdr->e_ident[EI_VERSION] != EV_CURRENT
 474             || hdr->e_version != EV_CURRENT) {
 475                 link_elf_obj_error(filename, "Unsupported file version");
 476                 error = ENOEXEC;
 477                 goto out;
 478         }
 479         if (hdr->e_type != ET_REL) {
 480                 error = ENOSYS;
 481                 goto out;
 482         }
 483         if (hdr->e_machine != ELF_TARG_MACH) {
 484                 link_elf_obj_error(filename, "Unsupported machine");
 485                 error = ENOEXEC;
 486                 goto out;
 487         }
 488
 489         ef = kmalloc(sizeof(struct elf_file), M_LINKER, M_WAITOK | M_ZERO);
 490         lf = linker_make_file(filename, ef, &link_elf_obj_file_ops);
 491         if (lf == NULL) {
 492                 kfree(ef, M_LINKER);
 493                 error = ENOMEM;
 494                 goto out;
 495         }
 496         ef->nprogtab = 0;
 497         ef->e_shdr = 0;
 498         ef->nreltab = 0;
 499         ef->nrelatab = 0;
 500
 501         /* Allocate and read in the section header */
 502         nbytes = hdr->e_shnum * hdr->e_shentsize;
 503         if (nbytes == 0 || hdr->e_shoff == 0 ||
 504             hdr->e_shentsize != sizeof(Elf_Shdr)) {
 505                 error = ENOEXEC;
 506                 goto out;
 507         }
 508         shdr = kmalloc(nbytes, M_LINKER, M_WAITOK);
 509         if (shdr == NULL) {
 510                 error = ENOMEM;
 511                 goto out;
 512         }
 513         ef->e_shdr = shdr;
 514         error = vn_rdwr(UIO_READ, vp, (caddr_t) shdr, nbytes, hdr->e_shoff,
 515                         UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
 516         if (error)
 517                 goto out;
 518         if (resid) {
 519                 error = ENOEXEC;
 520                 goto out;
 521         }
 522         /* Scan the section header for information and table sizing. */
 523         nsym = 0;
 524         symtabindex = -1;
 525         symstrindex = -1;
 526         for (i = 0; i < hdr->e_shnum; i++) {
 527                 switch (shdr[i].sh_type) {
 528                 case SHT_PROGBITS:
 529                 case SHT_NOBITS:
 530                         ef->nprogtab++;
 531                         break;
 532                 case SHT_SYMTAB:
 533                         nsym++;
 534                         symtabindex = i;
 535                         symstrindex = shdr[i].sh_link;
 536                         break;
 537                 case SHT_REL:
 538                         ef->nreltab++;
 539                         break;
 540                 case SHT_RELA:
 541                         ef->nrelatab++;
 542                         break;
 543                 case SHT_STRTAB:
 544                         break;
 545                 }
 546         }
 547         if (ef->nprogtab == 0) {
 548                 link_elf_obj_error(filename, "file has no contents");
 549                 error = ENOEXEC;
 550                 goto out;
 551         }
 552         if (nsym != 1) {
 553                 /* Only allow one symbol table for now */
 554                 link_elf_obj_error(filename, "file has no valid symbol table");
 555                 error = ENOEXEC;
 556                 goto out;
 557         }
 558         if (symstrindex < 0 || symstrindex > hdr->e_shnum ||
 559             shdr[symstrindex].sh_type != SHT_STRTAB) {
 560                 link_elf_obj_error(filename, "file has invalid symbol strings");
 561                 error = ENOEXEC;
 562                 goto out;
 563         }
 564         /* Allocate space for tracking the load chunks */
 565         if (ef->nprogtab != 0)
 566                 ef->progtab = kmalloc(ef->nprogtab * sizeof(*ef->progtab),
 567                                       M_LINKER, M_WAITOK | M_ZERO);
 568         if (ef->nreltab != 0)
 569                 ef->reltab = kmalloc(ef->nreltab * sizeof(*ef->reltab),
 570                                      M_LINKER, M_WAITOK | M_ZERO);
 571         if (ef->nrelatab != 0)
 572                 ef->relatab = kmalloc(ef->nrelatab * sizeof(*ef->relatab),
 573                                       M_LINKER, M_WAITOK | M_ZERO);
 574         if ((ef->nprogtab != 0 && ef->progtab == NULL) ||
 575             (ef->nreltab != 0 && ef->reltab == NULL) ||
 576             (ef->nrelatab != 0 && ef->relatab == NULL)) {
 577                 error = ENOMEM;
 578                 goto out;
 579         }
 580         if (symtabindex == -1)
 581                 panic("lost symbol table index");
 582         /* Allocate space for and load the symbol table */
 583         ef->ddbsymcnt = shdr[symtabindex].sh_size / sizeof(Elf_Sym);
 584         ef->ddbsymtab = kmalloc(shdr[symtabindex].sh_size, M_LINKER, M_WAITOK);
 585         if (ef->ddbsymtab == NULL) {
 586                 error = ENOMEM;
 587                 goto out;
 588         }
 589         error = vn_rdwr(UIO_READ, vp, (void *)ef->ddbsymtab,
 590                         shdr[symtabindex].sh_size, shdr[symtabindex].sh_offset,
 591                         UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
 592         if (error)
 593                 goto out;
 594         if (resid != 0) {
 595                 error = EINVAL;
 596                 goto out;
 597         }
 598         if (symstrindex == -1)
 599                 panic("lost symbol string index");
 600         /* Allocate space for and load the symbol strings */
 601         ef->ddbstrcnt = shdr[symstrindex].sh_size;
 602         ef->ddbstrtab = kmalloc(shdr[symstrindex].sh_size, M_LINKER, M_WAITOK);
 603         if (ef->ddbstrtab == NULL) {
 604                 error = ENOMEM;
 605                 goto out;
 606         }
 607         error = vn_rdwr(UIO_READ, vp, ef->ddbstrtab,
 608                         shdr[symstrindex].sh_size, shdr[symstrindex].sh_offset,
 609                         UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
 610         if (error)
 611                 goto out;
 612         if (resid != 0) {
 613                 error = EINVAL;
 614                 goto out;
 615         }
 616         /* Do we have a string table for the section names?  */
 617         shstrindex = -1;
 618         if (hdr->e_shstrndx != 0 &&
 619             shdr[hdr->e_shstrndx].sh_type == SHT_STRTAB) {
 620                 shstrindex = hdr->e_shstrndx;
 621                 ef->shstrcnt = shdr[shstrindex].sh_size;
 622                 ef->shstrtab = kmalloc(shdr[shstrindex].sh_size, M_LINKER,
 623                                        M_WAITOK);
 624                 if (ef->shstrtab == NULL) {
 625                         error = ENOMEM;
 626                         goto out;
 627                 }
 628                 error = vn_rdwr(UIO_READ, vp, ef->shstrtab,
 629                                 shdr[shstrindex].sh_size, shdr[shstrindex].sh_offset,
 630                                 UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
 631                 if (error)
 632                         goto out;
 633                 if (resid != 0) {
 634                         error = EINVAL;
 635                         goto out;
 636                 }
 637         }
 638         /* Size up code/data(progbits) and bss(nobits). */
 639         alignmask = 0;
 640         for (i = 0; i < hdr->e_shnum; i++) {
 641                 switch (shdr[i].sh_type) {
 642                 case SHT_PROGBITS:
 643                 case SHT_NOBITS:
 644                         alignmask = shdr[i].sh_addralign - 1;
 645                         mapsize += alignmask;
 646                         mapsize &= ~alignmask;
 647                         mapsize += shdr[i].sh_size;
 648                         break;
 649                 }
 650         }
 651
 652         /*
 653          * We know how much space we need for the text/data/bss/etc. This
 654          * stuff needs to be in a single chunk so that profiling etc can get
 655          * the bounds and gdb can associate offsets with modules
 656          */
 657         ef->object = vm_object_allocate(OBJT_DEFAULT,
 658                                         round_page(mapsize) >> PAGE_SHIFT);
 659         if (ef->object == NULL) {
 660                 error = ENOMEM;
 661                 goto out;
 662         }
 663         vm_object_reference(ef->object);
 664         ef->address = (caddr_t) vm_map_min(&kernel_map);
 665         ef->bytes = 0;
 666
 667         /*
 668          * In order to satisfy x86_64's architectural requirements on the
 669          * location of code and data in the kernel's address space, request a
 670          * mapping that is above the kernel.
 671          *
 672          * vkernel64's text+data is outside the managed VM space entirely.
 673          */
 674 #if defined(__amd64__) && defined(_KERNEL_VIRTUAL)
 675         error = vkernel_module_memory_alloc(&mapbase, round_page(mapsize));
 676 #else
 677         mapbase = KERNBASE;
 678         error = vm_map_find(&kernel_map, ef->object, 0, &mapbase,
 679                             round_page(mapsize), PAGE_SIZE,
 680                             TRUE, VM_MAPTYPE_NORMAL,
 681                             VM_PROT_ALL, VM_PROT_ALL, FALSE);
 682         if (error) {
 683                 vm_object_deallocate(ef->object);
 684                 ef->object = NULL;
 685                 goto out;
 686         }
 687         /* Wire the pages */
 688         error = vm_map_wire(&kernel_map, mapbase,
 689                             mapbase + round_page(mapsize), 0);
 690 #endif
 691         if (error != KERN_SUCCESS) {
 692                 error = ENOMEM;
 693                 goto out;
 694         }
 695         /* Inform the kld system about the situation */
 696         lf->address = ef->address = (caddr_t) mapbase;
 697         lf->size = round_page(mapsize);
 698         ef->bytes = mapsize;
 699
 700         /*
 701          * Now load code/data(progbits), zero bss(nobits), allocate space for
 702          * and load relocs
 703          */
 704         pb = 0;
 705         rl = 0;
 706         ra = 0;
 707         alignmask = 0;
 708         for (i = 0; i < hdr->e_shnum; i++) {
 709                 switch (shdr[i].sh_type) {
 710                 case SHT_PROGBITS:
 711                 case SHT_NOBITS:
 712                         alignmask = shdr[i].sh_addralign - 1;
 713                         mapbase += alignmask;
 714                         mapbase &= ~alignmask;
 715                         if (ef->shstrtab && shdr[i].sh_name != 0)
 716                                 ef->progtab[pb].name =
 717                                         ef->shstrtab + shdr[i].sh_name;
 718                         else if (shdr[i].sh_type == SHT_PROGBITS)
 719                                 ef->progtab[pb].name = "<<PROGBITS>>";
 720                         else
 721                                 ef->progtab[pb].name = "<<NOBITS>>";
 722 #if 0
 723                         if (ef->progtab[pb].name != NULL &&
 724                             !strcmp(ef->progtab[pb].name, "set_pcpu"))
 725                                 ef->progtab[pb].addr =
 726                                         dpcpu_alloc(shdr[i].sh_size);
 727 #ifdef VIMAGE
 728                         else if (ef->progtab[pb].name != NULL &&
 729                                  !strcmp(ef->progtab[pb].name, VNET_SETNAME))
 730                                 ef->progtab[pb].addr =
 731                                         vnet_data_alloc(shdr[i].sh_size);
 732 #endif
 733                         else
 734 #endif
 735                                 ef->progtab[pb].addr =
 736                                         (void *)(uintptr_t) mapbase;
 737                         if (ef->progtab[pb].addr == NULL) {
 738                                 error = ENOSPC;
 739                                 goto out;
 740                         }
 741                         ef->progtab[pb].size = shdr[i].sh_size;
 742                         ef->progtab[pb].sec = i;
 743                         if (shdr[i].sh_type == SHT_PROGBITS) {
 744                                 error = vn_rdwr(UIO_READ, vp,
 745                                                 ef->progtab[pb].addr,
 746                                                 shdr[i].sh_size, shdr[i].sh_offset,
 747                                                 UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred,
 748                                                 &resid);
 749                                 if (error)
 750                                         goto out;
 751                                 if (resid != 0) {
 752                                         error = EINVAL;
 753                                         goto out;
 754                                 }
 755 #if 0
 756                                 /* Initialize the per-cpu or vnet area. */
 757                                 if (ef->progtab[pb].addr != (void *)mapbase &&
 758                                     !strcmp(ef->progtab[pb].name, "set_pcpu"))
 759                                         dpcpu_copy(ef->progtab[pb].addr,
 760                                                    shdr[i].sh_size);
 761 #ifdef VIMAGE
 762                                 else if (ef->progtab[pb].addr !=
 763                                          (void *)mapbase &&
 764                                          !strcmp(ef->progtab[pb].name, VNET_SETNAME))
 765                                         vnet_data_copy(ef->progtab[pb].addr,
 766                                                        shdr[i].sh_size);
 767 #endif
 768 #endif
 769                         } else
 770                                 bzero(ef->progtab[pb].addr, shdr[i].sh_size);
 771
 772                         /* Update all symbol values with the offset. */
 773                         for (j = 0; j < ef->ddbsymcnt; j++) {
 774                                 es = &ef->ddbsymtab[j];
 775                                 if (es->st_shndx != i)
 776                                         continue;
 777                                 es->st_value += (Elf_Addr) ef->progtab[pb].addr;
 778                         }
 779                         mapbase += shdr[i].sh_size;
 780                         pb++;
 781                         break;
 782                 case SHT_REL:
 783                         ef->reltab[rl].rel = kmalloc(shdr[i].sh_size, M_LINKER, M_WAITOK);
 784                         ef->reltab[rl].nrel = shdr[i].sh_size / sizeof(Elf_Rel);
 785                         ef->reltab[rl].sec = shdr[i].sh_info;
 786                         error = vn_rdwr(UIO_READ, vp,
 787                                         (void *)ef->reltab[rl].rel,
 788                                         shdr[i].sh_size, shdr[i].sh_offset,
 789                                         UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
 790                         if (error)
 791                                 goto out;
 792                         if (resid != 0) {
 793                                 error = EINVAL;
 794                                 goto out;
 795                         }
 796                         rl++;
 797                         break;
 798                 case SHT_RELA:
 799                         ef->relatab[ra].rela = kmalloc(shdr[i].sh_size, M_LINKER, M_WAITOK);
 800                         ef->relatab[ra].nrela = shdr[i].sh_size / sizeof(Elf_Rela);
 801                         ef->relatab[ra].sec = shdr[i].sh_info;
 802                         error = vn_rdwr(UIO_READ, vp,
 803                                         (void *)ef->relatab[ra].rela,
 804                                         shdr[i].sh_size, shdr[i].sh_offset,
 805                                         UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
 806                         if (error)
 807                                 goto out;
 808                         if (resid != 0) {
 809                                 error = EINVAL;
 810                                 goto out;
 811                         }
 812                         ra++;
 813                         break;
 814                 }
 815         }
 816         if (pb != ef->nprogtab)
 817                 panic("lost progbits");
 818         if (rl != ef->nreltab)
 819                 panic("lost reltab");
 820         if (ra != ef->nrelatab)
 821                 panic("lost relatab");
 822         if (mapbase != (vm_offset_t) ef->address + mapsize)
 823                 panic("mapbase 0x%lx != address %p + mapsize 0x%lx (0x%lx)\n",
 824                       mapbase, ef->address, mapsize,
 825                       (vm_offset_t) ef->address + mapsize);
 826
 827         /* Local intra-module relocations */
 828         link_elf_obj_reloc_local(lf);
 829
 830         /* Pull in dependencies */
 831         error = linker_load_dependencies(lf);
 832         if (error)
 833                 goto out;
 834
 835         /* External relocations */
 836         error = relocate_file(lf);
 837         if (error)
 838                 goto out;
 839
 840         *result = lf;
 841
 842 out:
 843         if (error && lf)
 844                 linker_file_unload(lf /*, LINKER_UNLOAD_FORCE */);
 845         if (hdr)
 846                 kfree(hdr, M_LINKER);
 847         vn_unlock(vp);
 848         vn_close(vp, FREAD);
 849
 850         return error;
 851 }
 852
 853 static void
 854 link_elf_obj_unload_file(linker_file_t file)
 855 {
 856         elf_file_t      ef = file->priv;
 857         int i;
 858
 859         if (ef->progtab) {
 860                 for (i = 0; i < ef->nprogtab; i++) {
 861                         if (ef->progtab[i].size == 0)
 862                                 continue;
 863                         if (ef->progtab[i].name == NULL)
 864                                 continue;
 865 #if 0
 866                         if (!strcmp(ef->progtab[i].name, "set_pcpu"))
 867                                 dpcpu_free(ef->progtab[i].addr,
 868                                     ef->progtab[i].size);
 869 #ifdef VIMAGE
 870                         else if (!strcmp(ef->progtab[i].name, VNET_SETNAME))
 871                                 vnet_data_free(ef->progtab[i].addr,
 872                                     ef->progtab[i].size);
 873 #endif
 874 #endif
 875                 }
 876         }
 877         if (ef->preloaded) {
 878                 if (ef->reltab)
 879                         kfree(ef->reltab, M_LINKER);
 880                 if (ef->relatab)
 881                         kfree(ef->relatab, M_LINKER);
 882                 if (ef->progtab)
 883                         kfree(ef->progtab, M_LINKER);
 884                 if (ef->ctftab)
 885                         kfree(ef->ctftab, M_LINKER);
 886                 if (ef->ctfoff)
 887                         kfree(ef->ctfoff, M_LINKER);
 888                 if (ef->typoff)
 889                         kfree(ef->typoff, M_LINKER);
 890                 if (file->filename != NULL)
 891                         preload_delete_name(file->filename);
 892                 kfree(ef, M_LINKER);
 893                 /* XXX reclaim module memory? */
 894                 return;
 895         }
 896
 897         for (i = 0; i < ef->nreltab; i++)
 898                 if (ef->reltab[i].rel)
 899                         kfree(ef->reltab[i].rel, M_LINKER);
 900         for (i = 0; i < ef->nrelatab; i++)
 901                 if (ef->relatab[i].rela)
 902                         kfree(ef->relatab[i].rela, M_LINKER);
 903         if (ef->reltab)
 904                 kfree(ef->reltab, M_LINKER);
 905         if (ef->relatab)
 906                 kfree(ef->relatab, M_LINKER);
 907         if (ef->progtab)
 908                 kfree(ef->progtab, M_LINKER);
 909
 910         if (ef->object) {
 911 #if defined(__amd64__) && defined(_KERNEL_VIRTUAL)
 912                 vkernel_module_memory_free((vm_offset_t)ef->address, ef->bytes);
 913 #else
 914                 vm_map_remove(&kernel_map, (vm_offset_t) ef->address,
 915                     (vm_offset_t) ef->address +
 916                     (ef->object->size << PAGE_SHIFT));
 917 #endif
 918                 vm_object_deallocate(ef->object);
 919                 ef->object = NULL;
 920         }
 921         if (ef->e_shdr)
 922                 kfree(ef->e_shdr, M_LINKER);
 923         if (ef->ddbsymtab)
 924                 kfree(ef->ddbsymtab, M_LINKER);
 925         if (ef->ddbstrtab)
 926                 kfree(ef->ddbstrtab, M_LINKER);
 927         if (ef->shstrtab)
 928                 kfree(ef->shstrtab, M_LINKER);
 929         if (ef->ctftab)
 930                 kfree(ef->ctftab, M_LINKER);
 931         if (ef->ctfoff)
 932                 kfree(ef->ctfoff, M_LINKER);
 933         if (ef->typoff)
 934                 kfree(ef->typoff, M_LINKER);
 935         kfree(ef, M_LINKER);
 936 }
 937
 938 static const char *
 939 symbol_name(elf_file_t ef, Elf_Size r_info)
 940 {
 941         const Elf_Sym  *ref;
 942
 943         if (ELF_R_SYM(r_info)) {
 944                 ref = ef->ddbsymtab + ELF_R_SYM(r_info);
 945                 return ef->ddbstrtab + ref->st_name;
 946         } else
 947                 return NULL;
 948 }
 949
 950 static Elf_Addr
 951 findbase(elf_file_t ef, int sec)
 952 {
 953         int i;
 954         Elf_Addr base = 0;
 955
 956         for (i = 0; i < ef->nprogtab; i++) {
 957                 if (sec == ef->progtab[i].sec) {
 958                         base = (Elf_Addr)ef->progtab[i].addr;
 959                         break;
 960                 }
 961         }
 962         return base;
 963 }
 964
 965 static int
 966 relocate_file(linker_file_t lf)
 967 {
 968         elf_file_t      ef = lf->priv;
 969         const Elf_Rel *rellim;
 970         const Elf_Rel *rel;
 971         const Elf_Rela *relalim;
 972         const Elf_Rela *rela;
 973         const char *symname;
 974         const Elf_Sym *sym;
 975         int i;
 976         Elf_Size symidx;
 977         Elf_Addr base;
 978
 979         /* Perform relocations without addend if there are any: */
 980         for (i = 0; i < ef->nreltab; i++) {
 981                 rel = ef->reltab[i].rel;
 982                 if (rel == NULL)
 983                         panic("lost a reltab!");
 984                 rellim = rel + ef->reltab[i].nrel;
 985                 base = findbase(ef, ef->reltab[i].sec);
 986                 if (base == 0)
 987                         panic("lost base for reltab");
 988                 for ( ; rel < rellim; rel++) {
 989                         symidx = ELF_R_SYM(rel->r_info);
 990                         if (symidx >= ef->ddbsymcnt)
 991                                 continue;
 992                         sym = ef->ddbsymtab + symidx;
 993                         /* Local relocs are already done */
 994                         if (ELF_ST_BIND(sym->st_info) == STB_LOCAL)
 995                                 continue;
 996                         if (elf_reloc(lf, base, rel, ELF_RELOC_REL,
 997                             elf_obj_lookup)) {
 998                                 symname = symbol_name(ef, rel->r_info);
 999                                 kprintf("link_elf_obj_obj: symbol %s undefined\n",
1000                                     symname);
1001                                 return ENOENT;
1002                         }
1003                 }
1004         }
1005
1006         /* Perform relocations with addend if there are any: */
1007         for (i = 0; i < ef->nrelatab; i++) {
1008                 rela = ef->relatab[i].rela;
1009                 if (rela == NULL)
1010                         panic("lost a relatab!");
1011                 relalim = rela + ef->relatab[i].nrela;
1012                 base = findbase(ef, ef->relatab[i].sec);
1013                 if (base == 0)
1014                         panic("lost base for relatab");
1015                 for ( ; rela < relalim; rela++) {
1016                         symidx = ELF_R_SYM(rela->r_info);
1017                         if (symidx >= ef->ddbsymcnt)
1018                                 continue;
1019                         sym = ef->ddbsymtab + symidx;
1020                         /* Local relocs are already done */
1021                         if (ELF_ST_BIND(sym->st_info) == STB_LOCAL)
1022                                 continue;
1023                         if (elf_reloc(lf, base, rela, ELF_RELOC_RELA,
1024                             elf_obj_lookup)) {
1025                                 symname = symbol_name(ef, rela->r_info);
1026                                 kprintf("link_elf_obj_obj: symbol %s undefined\n",
1027                                     symname);
1028                                 return ENOENT;
1029                         }
1030                 }
1031         }
1032
1033         return 0;
1034 }
1035
1036 static int
1037 link_elf_obj_lookup_symbol(linker_file_t lf, const char *name, c_linker_sym_t *sym)
1038 {
1039         elf_file_t ef = lf->priv;
1040         const Elf_Sym *symp;
1041         const char *strp;
1042         int i;
1043
1044         for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) {
1045                 strp = ef->ddbstrtab + symp->st_name;
1046                 if (symp->st_shndx != SHN_UNDEF && strcmp(name, strp) == 0) {
1047                         *sym = (c_linker_sym_t) symp;
1048                         return 0;
1049                 }
1050         }
1051         return ENOENT;
1052 }
1053
1054 static int
1055 link_elf_obj_symbol_values(linker_file_t lf, c_linker_sym_t sym,
1056     linker_symval_t *symval)
1057 {
1058         elf_file_t ef = lf->priv;
1059         const Elf_Sym *es = (const Elf_Sym*) sym;
1060
1061         if (es >= ef->ddbsymtab && es < (ef->ddbsymtab + ef->ddbsymcnt)) {
1062                 symval->name = ef->ddbstrtab + es->st_name;
1063                 symval->value = (caddr_t)es->st_value;
1064                 symval->size = es->st_size;
1065                 return 0;
1066         }
1067         return ENOENT;
1068 }
1069
1070 static int
1071 link_elf_obj_search_symbol(linker_file_t lf, caddr_t value,
1072     c_linker_sym_t *sym, long *diffp)
1073 {
1074         elf_file_t ef = lf->priv;
1075         u_long off = (uintptr_t) (void *) value;
1076         u_long diff = off;
1077         u_long st_value;
1078         const Elf_Sym *es;
1079         const Elf_Sym *best = 0;
1080         int i;
1081
1082         for (i = 0, es = ef->ddbsymtab; i < ef->ddbsymcnt; i++, es++) {
1083                 if (es->st_name == 0)
1084                         continue;
1085                 st_value = es->st_value;
1086                 if (off >= st_value) {
1087                         if (off - st_value < diff) {
1088                                 diff = off - st_value;
1089                                 best = es;
1090                                 if (diff == 0)
1091                                         break;
1092                         } else if (off - st_value == diff) {
1093                                 best = es;
1094                         }
1095                 }
1096         }
1097         if (best == 0)
1098                 *diffp = off;
1099         else
1100                 *diffp = diff;
1101         *sym = (c_linker_sym_t) best;
1102
1103         return 0;
1104 }
1105
1106 /*
1107  * Look up a linker set on an ELF system.
1108  */
1109 static int
1110 link_elf_obj_lookup_set(linker_file_t lf, const char *name,
1111     void ***startp, void ***stopp, int *countp)
1112 {
1113         elf_file_t ef = lf->priv;
1114         void **start, **stop;
1115         int i, count;
1116
1117         /* Relative to section number */
1118         for (i = 0; i < ef->nprogtab; i++) {
1119                 if ((strncmp(ef->progtab[i].name, "set_", 4) == 0) &&
1120                     strcmp(ef->progtab[i].name + 4, name) == 0) {
1121                         start  = (void **)ef->progtab[i].addr;
1122                         stop = (void **)((char *)ef->progtab[i].addr +
1123                             ef->progtab[i].size);
1124                         count = stop - start;
1125                         if (startp)
1126                                 *startp = start;
1127                         if (stopp)
1128                                 *stopp = stop;
1129                         if (countp)
1130                                 *countp = count;
1131                         return (0);
1132                 }
1133         }
1134         return (ESRCH);
1135 }
1136
1137 /*
1138  * Symbol lookup function that can be used when the symbol index is known (ie
1139  * in relocations). It uses the symbol index instead of doing a fully fledged
1140  * hash table based lookup when such is valid. For example for local symbols.
1141  * This is not only more efficient, it's also more correct. It's not always
1142  * the case that the symbol can be found through the hash table.
1143  */
1144 static int
1145 elf_obj_lookup(linker_file_t lf, Elf_Size symidx, int deps, Elf_Addr *result)
1146 {
1147         elf_file_t ef = lf->priv;
1148         const Elf_Sym *sym;
1149         const char *symbol;
1150
1151         /* Don't even try to lookup the symbol if the index is bogus. */
1152         if (symidx >= ef->ddbsymcnt)
1153                 return (ENOENT);
1154
1155         sym = ef->ddbsymtab + symidx;
1156
1157         /* Quick answer if there is a definition included. */
1158         if (sym->st_shndx != SHN_UNDEF) {
1159                 *result = sym->st_value;
1160                 return (0);
1161         }
1162
1163         /* If we get here, then it is undefined and needs a lookup. */
1164         switch (ELF_ST_BIND(sym->st_info)) {
1165         case STB_LOCAL:
1166                 /* Local, but undefined? huh? */
1167                 return (ENOENT);
1168
1169         case STB_GLOBAL:
1170                 /* Relative to Data or Function name */
1171                 symbol = ef->ddbstrtab + sym->st_name;
1172
1173                 /* Force a lookup failure if the symbol name is bogus. */
1174                 if (*symbol == 0)
1175                         return (ENOENT);
1176                 return (linker_file_lookup_symbol(lf, symbol, deps, (caddr_t *)result));
1177
1178         case STB_WEAK:
1179                 kprintf("link_elf_obj_obj: Weak symbols not supported\n");
1180                 return (ENOENT);
1181
1182         default:
1183                 return (ENOENT);
1184         }
1185 }
1186
1187 static void
1188 link_elf_obj_fix_link_set(elf_file_t ef)
1189 {
1190         static const char startn[] = "__start_";
1191         static const char stopn[] = "__stop_";
1192         Elf_Sym *sym;
1193         const char *sym_name, *linkset_name;
1194         Elf_Addr startp, stopp;
1195         Elf_Size symidx;
1196         int start, i;
1197
1198         startp = stopp = 0;
1199         for (symidx = 1 /* zero entry is special */;
1200                 symidx < ef->ddbsymcnt; symidx++) {
1201                 sym = ef->ddbsymtab + symidx;
1202                 if (sym->st_shndx != SHN_UNDEF)
1203                         continue;
1204
1205                 sym_name = ef->ddbstrtab + sym->st_name;
1206                 if (strncmp(sym_name, startn, sizeof(startn) - 1) == 0) {
1207                         start = 1;
1208                         linkset_name = sym_name + sizeof(startn) - 1;
1209                 }
1210                 else if (strncmp(sym_name, stopn, sizeof(stopn) - 1) == 0) {
1211                         start = 0;
1212                         linkset_name = sym_name + sizeof(stopn) - 1;
1213                 }
1214                 else
1215                         continue;
1216
1217                 for (i = 0; i < ef->nprogtab; i++) {
1218                         if (strcmp(ef->progtab[i].name, linkset_name) == 0) {
1219                                 startp = (Elf_Addr)ef->progtab[i].addr;
1220                                 stopp = (Elf_Addr)(startp + ef->progtab[i].size);
1221                                 break;
1222                         }
1223                 }
1224                 if (i == ef->nprogtab)
1225                         continue;
1226
1227                 sym->st_value = start ? startp : stopp;
1228                 sym->st_shndx = i;
1229         }
1230 }
1231
1232 static void
1233 link_elf_obj_reloc_local(linker_file_t lf)
1234 {
1235         elf_file_t ef = lf->priv;
1236         const Elf_Rel *rellim;
1237         const Elf_Rel *rel;
1238         const Elf_Rela *relalim;
1239         const Elf_Rela *rela;
1240         const Elf_Sym *sym;
1241         Elf_Addr base;
1242         int i;
1243         Elf_Size symidx;
1244
1245         link_elf_obj_fix_link_set(ef);
1246
1247         /* Perform relocations without addend if there are any: */
1248         for (i = 0; i < ef->nreltab; i++) {
1249                 rel = ef->reltab[i].rel;
1250                 if (rel == NULL)
1251                         panic("lost a reltab!");
1252                 rellim = rel + ef->reltab[i].nrel;
1253                 base = findbase(ef, ef->reltab[i].sec);
1254                 if (base == 0)
1255                         panic("lost base for reltab");
1256                 for ( ; rel < rellim; rel++) {
1257                         symidx = ELF_R_SYM(rel->r_info);
1258                         if (symidx >= ef->ddbsymcnt)
1259                                 continue;
1260                         sym = ef->ddbsymtab + symidx;
1261                         /* Only do local relocs */
1262                         if (ELF_ST_BIND(sym->st_info) != STB_LOCAL)
1263                                 continue;
1264                         elf_reloc_local(lf, base, rel, ELF_RELOC_REL,
1265                             elf_obj_lookup);
1266                 }
1267         }
1268
1269         /* Perform relocations with addend if there are any: */
1270         for (i = 0; i < ef->nrelatab; i++) {
1271                 rela = ef->relatab[i].rela;
1272                 if (rela == NULL)
1273                         panic("lost a relatab!");
1274                 relalim = rela + ef->relatab[i].nrela;
1275                 base = findbase(ef, ef->relatab[i].sec);
1276                 if (base == 0)
1277                         panic("lost base for relatab");
1278                 for ( ; rela < relalim; rela++) {
1279                         symidx = ELF_R_SYM(rela->r_info);
1280                         if (symidx >= ef->ddbsymcnt)
1281                                 continue;
1282                         sym = ef->ddbsymtab + symidx;
1283                         /* Only do local relocs */
1284                         if (ELF_ST_BIND(sym->st_info) != STB_LOCAL)
1285                                 continue;
1286                         elf_reloc_local(lf, base, rela, ELF_RELOC_RELA,
1287                             elf_obj_lookup);
1288                 }
1289         }
1290 }