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