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                 if (shdr[i].sh_size == 0)
 519                         continue;
 520                 switch (shdr[i].sh_type) {
 521                 case SHT_PROGBITS:
 522                 case SHT_NOBITS:
 523                         ef->nprogtab++;
 524                         break;
 525                 case SHT_SYMTAB:
 526                         nsym++;
 527                         symtabindex = i;
 528                         symstrindex = shdr[i].sh_link;
 529                         break;
 530                 case SHT_REL:
 531                         ef->nreltab++;
 532                         break;
 533                 case SHT_RELA:
 534                         ef->nrelatab++;
 535                         break;
 536                 case SHT_STRTAB:
 537                         break;
 538                 }
 539         }
 540         if (ef->nprogtab == 0) {
 541                 link_elf_obj_error(filename, "file has no contents");
 542                 error = ENOEXEC;
 543                 goto out;
 544         }
 545         if (nsym != 1) {
 546                 /* Only allow one symbol table for now */
 547                 link_elf_obj_error(filename, "file has no valid symbol table");
 548                 error = ENOEXEC;
 549                 goto out;
 550         }
 551         if (symstrindex < 0 || symstrindex > hdr->e_shnum ||
 552             shdr[symstrindex].sh_type != SHT_STRTAB) {
 553                 link_elf_obj_error(filename, "file has invalid symbol strings");
 554                 error = ENOEXEC;
 555                 goto out;
 556         }
 557         /* Allocate space for tracking the load chunks */
 558         if (ef->nprogtab != 0)
 559                 ef->progtab = kmalloc(ef->nprogtab * sizeof(*ef->progtab),
 560                                       M_LINKER, M_WAITOK | M_ZERO);
 561         if (ef->nreltab != 0)
 562                 ef->reltab = kmalloc(ef->nreltab * sizeof(*ef->reltab),
 563                                      M_LINKER, M_WAITOK | M_ZERO);
 564         if (ef->nrelatab != 0)
 565                 ef->relatab = kmalloc(ef->nrelatab * sizeof(*ef->relatab),
 566                                       M_LINKER, M_WAITOK | M_ZERO);
 567         if ((ef->nprogtab != 0 && ef->progtab == NULL) ||
 568             (ef->nreltab != 0 && ef->reltab == NULL) ||
 569             (ef->nrelatab != 0 && ef->relatab == NULL)) {
 570                 error = ENOMEM;
 571                 goto out;
 572         }
 573         if (symtabindex == -1)
 574                 panic("lost symbol table index");
 575         /* Allocate space for and load the symbol table */
 576         ef->ddbsymcnt = shdr[symtabindex].sh_size / sizeof(Elf_Sym);
 577         ef->ddbsymtab = kmalloc(shdr[symtabindex].sh_size, M_LINKER, M_WAITOK);
 578         error = vn_rdwr(UIO_READ, vp, (void *)ef->ddbsymtab,
 579                         shdr[symtabindex].sh_size, shdr[symtabindex].sh_offset,
 580                         UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
 581         if (error)
 582                 goto out;
 583         if (resid != 0) {
 584                 error = EINVAL;
 585                 goto out;
 586         }
 587         if (symstrindex == -1)
 588                 panic("lost symbol string index");
 589         /* Allocate space for and load the symbol strings */
 590         ef->ddbstrcnt = shdr[symstrindex].sh_size;
 591         ef->ddbstrtab = kmalloc(shdr[symstrindex].sh_size, M_LINKER, M_WAITOK);
 592         error = vn_rdwr(UIO_READ, vp, ef->ddbstrtab,
 593                         shdr[symstrindex].sh_size, shdr[symstrindex].sh_offset,
 594                         UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
 595         if (error)
 596                 goto out;
 597         if (resid != 0) {
 598                 error = EINVAL;
 599                 goto out;
 600         }
 601         /* Do we have a string table for the section names?  */
 602         shstrindex = -1;
 603         if (hdr->e_shstrndx != 0 &&
 604             shdr[hdr->e_shstrndx].sh_type == SHT_STRTAB) {
 605                 shstrindex = hdr->e_shstrndx;
 606                 ef->shstrcnt = shdr[shstrindex].sh_size;
 607                 ef->shstrtab = kmalloc(shdr[shstrindex].sh_size, M_LINKER,
 608                                        M_WAITOK);
 609                 error = vn_rdwr(UIO_READ, vp, ef->shstrtab,
 610                                 shdr[shstrindex].sh_size, shdr[shstrindex].sh_offset,
 611                                 UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
 612                 if (error)
 613                         goto out;
 614                 if (resid != 0) {
 615                         error = EINVAL;
 616                         goto out;
 617                 }
 618         }
 619         /* Size up code/data(progbits) and bss(nobits). */
 620         alignmask = 0;
 621         for (i = 0; i < hdr->e_shnum; i++) {
 622                 if (shdr[i].sh_size == 0)
 623                         continue;
 624                 switch (shdr[i].sh_type) {
 625                 case SHT_PROGBITS:
 626                 case SHT_NOBITS:
 627                         alignmask = shdr[i].sh_addralign - 1;
 628                         mapsize += alignmask;
 629                         mapsize &= ~alignmask;
 630                         mapsize += shdr[i].sh_size;
 631                         break;
 632                 }
 633         }
 634
 635         /*
 636          * We know how much space we need for the text/data/bss/etc. This
 637          * stuff needs to be in a single chunk so that profiling etc can get
 638          * the bounds and gdb can associate offsets with modules
 639          */
 640         ef->object = vm_object_allocate(OBJT_DEFAULT,
 641                                         round_page(mapsize) >> PAGE_SHIFT);
 642         if (ef->object == NULL) {
 643                 error = ENOMEM;
 644                 goto out;
 645         }
 646         vm_object_hold(ef->object);
 647         vm_object_reference_locked(ef->object);
 648         ef->address = (caddr_t) vm_map_min(&kernel_map);
 649         ef->bytes = 0;
 650
 651         /*
 652          * In order to satisfy x86_64's architectural requirements on the
 653          * location of code and data in the kernel's address space, request a
 654          * mapping that is above the kernel.
 655          *
 656          * vkernel64's text+data is outside the managed VM space entirely.
 657          */
 658 #if defined(__x86_64__) && defined(_KERNEL_VIRTUAL)
 659         error = vkernel_module_memory_alloc(&mapbase, round_page(mapsize));
 660         vm_object_drop(ef->object);
 661 #else
 662         mapbase = KERNBASE;
 663         error = vm_map_find(&kernel_map, ef->object, NULL,
 664                             0, &mapbase, round_page(mapsize),
 665                             PAGE_SIZE,
 666                             TRUE, VM_MAPTYPE_NORMAL,
 667                             VM_PROT_ALL, VM_PROT_ALL, FALSE);
 668         vm_object_drop(ef->object);
 669         if (error) {
 670                 vm_object_deallocate(ef->object);
 671                 ef->object = NULL;
 672                 goto out;
 673         }
 674         /* Wire the pages */
 675         error = vm_map_wire(&kernel_map, mapbase,
 676                             mapbase + round_page(mapsize), 0);
 677 #endif
 678         if (error != KERN_SUCCESS) {
 679                 error = ENOMEM;
 680                 goto out;
 681         }
 682         /* Inform the kld system about the situation */
 683         lf->address = ef->address = (caddr_t) mapbase;
 684         lf->size = round_page(mapsize);
 685         ef->bytes = mapsize;
 686
 687         /*
 688          * Now load code/data(progbits), zero bss(nobits), allocate space for
 689          * and load relocs
 690          */
 691         pb = 0;
 692         rl = 0;
 693         ra = 0;
 694         alignmask = 0;
 695         for (i = 0; i < hdr->e_shnum; i++) {
 696                 if (shdr[i].sh_size == 0)
 697                         continue;
 698                 switch (shdr[i].sh_type) {
 699                 case SHT_PROGBITS:
 700                 case SHT_NOBITS:
 701                         alignmask = shdr[i].sh_addralign - 1;
 702                         mapbase += alignmask;
 703                         mapbase &= ~alignmask;
 704                         if (ef->shstrtab && shdr[i].sh_name != 0)
 705                                 ef->progtab[pb].name =
 706                                         ef->shstrtab + shdr[i].sh_name;
 707                         else if (shdr[i].sh_type == SHT_PROGBITS)
 708                                 ef->progtab[pb].name = "<<PROGBITS>>";
 709                         else
 710                                 ef->progtab[pb].name = "<<NOBITS>>";
 711 #if 0
 712                         if (ef->progtab[pb].name != NULL &&
 713                             !strcmp(ef->progtab[pb].name, "set_pcpu"))
 714                                 ef->progtab[pb].addr =
 715                                         dpcpu_alloc(shdr[i].sh_size);
 716 #ifdef VIMAGE
 717                         else if (ef->progtab[pb].name != NULL &&
 718                                  !strcmp(ef->progtab[pb].name, VNET_SETNAME))
 719                                 ef->progtab[pb].addr =
 720                                         vnet_data_alloc(shdr[i].sh_size);
 721 #endif
 722                         else
 723 #endif
 724                                 ef->progtab[pb].addr =
 725                                         (void *)(uintptr_t) mapbase;
 726                         if (ef->progtab[pb].addr == NULL) {
 727                                 error = ENOSPC;
 728                                 goto out;
 729                         }
 730                         ef->progtab[pb].size = shdr[i].sh_size;
 731                         ef->progtab[pb].sec = i;
 732                         if (shdr[i].sh_type == SHT_PROGBITS) {
 733                                 error = vn_rdwr(UIO_READ, vp,
 734                                                 ef->progtab[pb].addr,
 735                                                 shdr[i].sh_size, shdr[i].sh_offset,
 736                                                 UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred,
 737                                                 &resid);
 738                                 if (error)
 739                                         goto out;
 740                                 if (resid != 0) {
 741                                         error = EINVAL;
 742                                         goto out;
 743                                 }
 744 #if 0
 745                                 /* Initialize the per-cpu or vnet area. */
 746                                 if (ef->progtab[pb].addr != (void *)mapbase &&
 747                                     !strcmp(ef->progtab[pb].name, "set_pcpu"))
 748                                         dpcpu_copy(ef->progtab[pb].addr,
 749                                                    shdr[i].sh_size);
 750 #ifdef VIMAGE
 751                                 else if (ef->progtab[pb].addr !=
 752                                          (void *)mapbase &&
 753                                          !strcmp(ef->progtab[pb].name, VNET_SETNAME))
 754                                         vnet_data_copy(ef->progtab[pb].addr,
 755                                                        shdr[i].sh_size);
 756 #endif
 757 #endif
 758                         } else
 759                                 bzero(ef->progtab[pb].addr, shdr[i].sh_size);
 760
 761                         /* Update all symbol values with the offset. */
 762                         for (j = 0; j < ef->ddbsymcnt; j++) {
 763                                 es = &ef->ddbsymtab[j];
 764                                 if (es->st_shndx != i)
 765                                         continue;
 766                                 es->st_value += (Elf_Addr) ef->progtab[pb].addr;
 767                         }
 768                         mapbase += shdr[i].sh_size;
 769                         pb++;
 770                         break;
 771                 case SHT_REL:
 772                         ef->reltab[rl].rel = kmalloc(shdr[i].sh_size, M_LINKER, M_WAITOK);
 773                         ef->reltab[rl].nrel = shdr[i].sh_size / sizeof(Elf_Rel);
 774                         ef->reltab[rl].sec = shdr[i].sh_info;
 775                         error = vn_rdwr(UIO_READ, vp,
 776                                         (void *)ef->reltab[rl].rel,
 777                                         shdr[i].sh_size, shdr[i].sh_offset,
 778                                         UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
 779                         if (error)
 780                                 goto out;
 781                         if (resid != 0) {
 782                                 error = EINVAL;
 783                                 goto out;
 784                         }
 785                         rl++;
 786                         break;
 787                 case SHT_RELA:
 788                         ef->relatab[ra].rela = kmalloc(shdr[i].sh_size, M_LINKER, M_WAITOK);
 789                         ef->relatab[ra].nrela = shdr[i].sh_size / sizeof(Elf_Rela);
 790                         ef->relatab[ra].sec = shdr[i].sh_info;
 791                         error = vn_rdwr(UIO_READ, vp,
 792                                         (void *)ef->relatab[ra].rela,
 793                                         shdr[i].sh_size, shdr[i].sh_offset,
 794                                         UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
 795                         if (error)
 796                                 goto out;
 797                         if (resid != 0) {
 798                                 error = EINVAL;
 799                                 goto out;
 800                         }
 801                         ra++;
 802                         break;
 803                 }
 804         }
 805         if (pb != ef->nprogtab)
 806                 panic("lost progbits");
 807         if (rl != ef->nreltab)
 808                 panic("lost reltab");
 809         if (ra != ef->nrelatab)
 810                 panic("lost relatab");
 811         if (mapbase != (vm_offset_t) ef->address + mapsize)
 812                 panic("mapbase 0x%lx != address %p + mapsize 0x%lx (0x%lx)",
 813                       mapbase, ef->address, mapsize,
 814                       (vm_offset_t) ef->address + mapsize);
 815
 816         /* Local intra-module relocations */
 817         link_elf_obj_reloc_local(lf);
 818
 819         /* Pull in dependencies */
 820         error = linker_load_dependencies(lf);
 821         if (error)
 822                 goto out;
 823
 824         /* External relocations */
 825         error = relocate_file(lf);
 826         if (error)
 827                 goto out;
 828
 829         *result = lf;
 830
 831 out:
 832         if (error && lf)
 833                 linker_file_unload(lf /*, LINKER_UNLOAD_FORCE */);
 834         if (hdr)
 835                 kfree(hdr, M_LINKER);
 836         vn_unlock(vp);
 837         vn_close(vp, FREAD, NULL);
 838
 839         return error;
 840 }
 841
 842 static void
 843 link_elf_obj_unload_file(linker_file_t file)
 844 {
 845         elf_file_t      ef = file->priv;
 846         int i;
 847
 848         if (ef->progtab) {
 849                 for (i = 0; i < ef->nprogtab; i++) {
 850                         if (ef->progtab[i].size == 0)
 851                                 continue;
 852                         if (ef->progtab[i].name == NULL)
 853                                 continue;
 854 #if 0
 855                         if (!strcmp(ef->progtab[i].name, "set_pcpu"))
 856                                 dpcpu_free(ef->progtab[i].addr,
 857                                     ef->progtab[i].size);
 858 #ifdef VIMAGE
 859                         else if (!strcmp(ef->progtab[i].name, VNET_SETNAME))
 860                                 vnet_data_free(ef->progtab[i].addr,
 861                                     ef->progtab[i].size);
 862 #endif
 863 #endif
 864                 }
 865         }
 866         if (ef->preloaded) {
 867                 if (ef->reltab)
 868                         kfree(ef->reltab, M_LINKER);
 869                 if (ef->relatab)
 870                         kfree(ef->relatab, M_LINKER);
 871                 if (ef->progtab)
 872                         kfree(ef->progtab, M_LINKER);
 873                 if (ef->ctftab)
 874                         kfree(ef->ctftab, M_LINKER);
 875                 if (ef->ctfoff)
 876                         kfree(ef->ctfoff, M_LINKER);
 877                 if (ef->typoff)
 878                         kfree(ef->typoff, M_LINKER);
 879                 if (file->filename != NULL)
 880                         preload_delete_name(file->filename);
 881                 kfree(ef, M_LINKER);
 882                 /* XXX reclaim module memory? */
 883                 return;
 884         }
 885
 886         for (i = 0; i < ef->nreltab; i++)
 887                 if (ef->reltab[i].rel)
 888                         kfree(ef->reltab[i].rel, M_LINKER);
 889         for (i = 0; i < ef->nrelatab; i++)
 890                 if (ef->relatab[i].rela)
 891                         kfree(ef->relatab[i].rela, M_LINKER);
 892         if (ef->reltab)
 893                 kfree(ef->reltab, M_LINKER);
 894         if (ef->relatab)
 895                 kfree(ef->relatab, M_LINKER);
 896         if (ef->progtab)
 897                 kfree(ef->progtab, M_LINKER);
 898
 899         if (ef->object) {
 900 #if defined(__x86_64__) && defined(_KERNEL_VIRTUAL)
 901                 vkernel_module_memory_free((vm_offset_t)ef->address, ef->bytes);
 902 #else
 903                 vm_map_remove(&kernel_map, (vm_offset_t) ef->address,
 904                     (vm_offset_t) ef->address +
 905                     (ef->object->size << PAGE_SHIFT));
 906 #endif
 907                 vm_object_deallocate(ef->object);
 908                 ef->object = NULL;
 909         }
 910         if (ef->e_shdr)
 911                 kfree(ef->e_shdr, M_LINKER);
 912         if (ef->ddbsymtab)
 913                 kfree(ef->ddbsymtab, M_LINKER);
 914         if (ef->ddbstrtab)
 915                 kfree(ef->ddbstrtab, M_LINKER);
 916         if (ef->shstrtab)
 917                 kfree(ef->shstrtab, M_LINKER);
 918         if (ef->ctftab)
 919                 kfree(ef->ctftab, M_LINKER);
 920         if (ef->ctfoff)
 921                 kfree(ef->ctfoff, M_LINKER);
 922         if (ef->typoff)
 923                 kfree(ef->typoff, M_LINKER);
 924         kfree(ef, M_LINKER);
 925 }
 926
 927 static const char *
 928 symbol_name(elf_file_t ef, Elf_Size r_info)
 929 {
 930         const Elf_Sym  *ref;
 931
 932         if (ELF_R_SYM(r_info)) {
 933                 ref = ef->ddbsymtab + ELF_R_SYM(r_info);
 934                 return ef->ddbstrtab + ref->st_name;
 935         } else
 936                 return NULL;
 937 }
 938
 939 static Elf_Addr
 940 findbase(elf_file_t ef, int sec)
 941 {
 942         int i;
 943         Elf_Addr base = 0;
 944
 945         for (i = 0; i < ef->nprogtab; i++) {
 946                 if (sec == ef->progtab[i].sec) {
 947                         base = (Elf_Addr)ef->progtab[i].addr;
 948                         break;
 949                 }
 950         }
 951         return base;
 952 }
 953
 954 static int
 955 relocate_file(linker_file_t lf)
 956 {
 957         elf_file_t      ef = lf->priv;
 958         const Elf_Rel *rellim;
 959         const Elf_Rel *rel;
 960         const Elf_Rela *relalim;
 961         const Elf_Rela *rela;
 962         const char *symname;
 963         const Elf_Sym *sym;
 964         int i;
 965         Elf_Size symidx;
 966         Elf_Addr base;
 967
 968         /* Perform relocations without addend if there are any: */
 969         for (i = 0; i < ef->nreltab; i++) {
 970                 rel = ef->reltab[i].rel;
 971                 if (rel == NULL)
 972                         panic("lost a reltab!");
 973                 rellim = rel + ef->reltab[i].nrel;
 974                 base = findbase(ef, ef->reltab[i].sec);
 975                 if (base == 0)
 976                         panic("lost base for reltab");
 977                 for ( ; rel < rellim; rel++) {
 978                         symidx = ELF_R_SYM(rel->r_info);
 979                         if (symidx >= ef->ddbsymcnt)
 980                                 continue;
 981                         sym = ef->ddbsymtab + symidx;
 982                         /* Local relocs are already done */
 983                         if (ELF_ST_BIND(sym->st_info) == STB_LOCAL)
 984                                 continue;
 985                         if (elf_reloc(lf, base, rel, ELF_RELOC_REL,
 986                             elf_obj_lookup)) {
 987                                 symname = symbol_name(ef, rel->r_info);
 988                                 kprintf("link_elf_obj_obj: symbol %s undefined\n",
 989                                     symname);
 990                                 return ENOENT;
 991                         }
 992                 }
 993         }
 994
 995         /* Perform relocations with addend if there are any: */
 996         for (i = 0; i < ef->nrelatab; i++) {
 997                 rela = ef->relatab[i].rela;
 998                 if (rela == NULL)
 999                         panic("lost a relatab!");
1000                 relalim = rela + ef->relatab[i].nrela;
1001                 base = findbase(ef, ef->relatab[i].sec);
1002                 if (base == 0)
1003                         panic("lost base for relatab");
1004                 for ( ; rela < relalim; rela++) {
1005                         symidx = ELF_R_SYM(rela->r_info);
1006                         if (symidx >= ef->ddbsymcnt)
1007                                 continue;
1008                         sym = ef->ddbsymtab + symidx;
1009                         /* Local relocs are already done */
1010                         if (ELF_ST_BIND(sym->st_info) == STB_LOCAL)
1011                                 continue;
1012                         if (elf_reloc(lf, base, rela, ELF_RELOC_RELA,
1013                             elf_obj_lookup)) {
1014                                 symname = symbol_name(ef, rela->r_info);
1015                                 kprintf("link_elf_obj_obj: symbol %s undefined\n",
1016                                     symname);
1017                                 return ENOENT;
1018                         }
1019                 }
1020         }
1021
1022         return 0;
1023 }
1024
1025 static int
1026 link_elf_obj_lookup_symbol(linker_file_t lf, const char *name, c_linker_sym_t *sym)
1027 {
1028         elf_file_t ef = lf->priv;
1029         const Elf_Sym *symp;
1030         const char *strp;
1031         int i;
1032
1033         for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) {
1034                 strp = ef->ddbstrtab + symp->st_name;
1035                 if (symp->st_shndx != SHN_UNDEF && strcmp(name, strp) == 0) {
1036                         *sym = (c_linker_sym_t) symp;
1037                         return 0;
1038                 }
1039         }
1040         return ENOENT;
1041 }
1042
1043 static int
1044 link_elf_obj_symbol_values(linker_file_t lf, c_linker_sym_t sym,
1045     linker_symval_t *symval)
1046 {
1047         elf_file_t ef = lf->priv;
1048         const Elf_Sym *es = (const Elf_Sym*) sym;
1049
1050         if (es >= ef->ddbsymtab && es < (ef->ddbsymtab + ef->ddbsymcnt)) {
1051                 symval->name = ef->ddbstrtab + es->st_name;
1052                 symval->value = (caddr_t)es->st_value;
1053                 symval->size = es->st_size;
1054                 return 0;
1055         }
1056         return ENOENT;
1057 }
1058
1059 static int
1060 link_elf_obj_search_symbol(linker_file_t lf, caddr_t value,
1061     c_linker_sym_t *sym, long *diffp)
1062 {
1063         elf_file_t ef = lf->priv;
1064         u_long off = (uintptr_t) (void *) value;
1065         u_long diff = off;
1066         u_long st_value;
1067         const Elf_Sym *es;
1068         const Elf_Sym *best = NULL;
1069         int i;
1070
1071         for (i = 0, es = ef->ddbsymtab; i < ef->ddbsymcnt; i++, es++) {
1072                 if (es->st_name == 0)
1073                         continue;
1074                 st_value = es->st_value;
1075                 if (off >= st_value) {
1076                         if (off - st_value < diff) {
1077                                 diff = off - st_value;
1078                                 best = es;
1079                                 if (diff == 0)
1080                                         break;
1081                         } else if (off - st_value == diff) {
1082                                 best = es;
1083                         }
1084                 }
1085         }
1086         if (best == NULL)
1087                 *diffp = off;
1088         else
1089                 *diffp = diff;
1090         *sym = (c_linker_sym_t) best;
1091
1092         return 0;
1093 }
1094
1095 /*
1096  * Look up a linker set on an ELF system.
1097  */
1098 static int
1099 link_elf_obj_lookup_set(linker_file_t lf, const char *name,
1100     void ***startp, void ***stopp, int *countp)
1101 {
1102         elf_file_t ef = lf->priv;
1103         void **start, **stop;
1104         int i, count;
1105
1106         /* Relative to section number */
1107         for (i = 0; i < ef->nprogtab; i++) {
1108                 if ((strncmp(ef->progtab[i].name, "set_", 4) == 0) &&
1109                     strcmp(ef->progtab[i].name + 4, name) == 0) {
1110                         start  = (void **)ef->progtab[i].addr;
1111                         stop = (void **)((char *)ef->progtab[i].addr +
1112                             ef->progtab[i].size);
1113                         count = stop - start;
1114                         if (startp)
1115                                 *startp = start;
1116                         if (stopp)
1117                                 *stopp = stop;
1118                         if (countp)
1119                                 *countp = count;
1120                         return (0);
1121                 }
1122         }
1123         return (ESRCH);
1124 }
1125
1126 /*
1127  * Symbol lookup function that can be used when the symbol index is known (ie
1128  * in relocations). It uses the symbol index instead of doing a fully fledged
1129  * hash table based lookup when such is valid. For example for local symbols.
1130  * This is not only more efficient, it's also more correct. It's not always
1131  * the case that the symbol can be found through the hash table.
1132  */
1133 static int
1134 elf_obj_lookup(linker_file_t lf, Elf_Size symidx, int deps, Elf_Addr *result)
1135 {
1136         elf_file_t ef = lf->priv;
1137         const Elf_Sym *sym;
1138         const char *symbol;
1139
1140         /* Don't even try to lookup the symbol if the index is bogus. */
1141         if (symidx >= ef->ddbsymcnt)
1142                 return (ENOENT);
1143
1144         sym = ef->ddbsymtab + symidx;
1145
1146         /* Quick answer if there is a definition included. */
1147         if (sym->st_shndx != SHN_UNDEF) {
1148                 *result = sym->st_value;
1149                 return (0);
1150         }
1151
1152         /* If we get here, then it is undefined and needs a lookup. */
1153         switch (ELF_ST_BIND(sym->st_info)) {
1154         case STB_LOCAL:
1155                 /* Local, but undefined? huh? */
1156                 return (ENOENT);
1157
1158         case STB_GLOBAL:
1159                 /* Relative to Data or Function name */
1160                 symbol = ef->ddbstrtab + sym->st_name;
1161
1162                 /* Force a lookup failure if the symbol name is bogus. */
1163                 if (*symbol == 0)
1164                         return (ENOENT);
1165                 return (linker_file_lookup_symbol(lf, symbol, deps, (caddr_t *)result));
1166
1167         case STB_WEAK:
1168                 kprintf("link_elf_obj_obj: Weak symbols not supported\n");
1169                 return (ENOENT);
1170
1171         default:
1172                 return (ENOENT);
1173         }
1174 }
1175
1176 static void
1177 link_elf_obj_fix_link_set(elf_file_t ef)
1178 {
1179         static const char startn[] = "__start_";
1180         static const char stopn[] = "__stop_";
1181         Elf_Sym *sym;
1182         const char *sym_name, *linkset_name;
1183         Elf_Addr startp, stopp;
1184         Elf_Size symidx;
1185         int start, i;
1186
1187         startp = stopp = 0;
1188         for (symidx = 1 /* zero entry is special */;
1189                 symidx < ef->ddbsymcnt; symidx++) {
1190                 sym = ef->ddbsymtab + symidx;
1191                 if (sym->st_shndx != SHN_UNDEF)
1192                         continue;
1193
1194                 sym_name = ef->ddbstrtab + sym->st_name;
1195                 if (strncmp(sym_name, startn, sizeof(startn) - 1) == 0) {
1196                         start = 1;
1197                         linkset_name = sym_name + sizeof(startn) - 1;
1198                 }
1199                 else if (strncmp(sym_name, stopn, sizeof(stopn) - 1) == 0) {
1200                         start = 0;
1201                         linkset_name = sym_name + sizeof(stopn) - 1;
1202                 }
1203                 else
1204                         continue;
1205
1206                 for (i = 0; i < ef->nprogtab; i++) {
1207                         if (strcmp(ef->progtab[i].name, linkset_name) == 0) {
1208                                 startp = (Elf_Addr)ef->progtab[i].addr;
1209                                 stopp = (Elf_Addr)(startp + ef->progtab[i].size);
1210                                 break;
1211                         }
1212                 }
1213                 if (i == ef->nprogtab)
1214                         continue;
1215
1216                 sym->st_value = start ? startp : stopp;
1217                 sym->st_shndx = i;
1218         }
1219 }
1220
1221 static void
1222 link_elf_obj_reloc_local(linker_file_t lf)
1223 {
1224         elf_file_t ef = lf->priv;
1225         const Elf_Rel *rellim;
1226         const Elf_Rel *rel;
1227         const Elf_Rela *relalim;
1228         const Elf_Rela *rela;
1229         const Elf_Sym *sym;
1230         Elf_Addr base;
1231         int i;
1232         Elf_Size symidx;
1233
1234         link_elf_obj_fix_link_set(ef);
1235
1236         /* Perform relocations without addend if there are any: */
1237         for (i = 0; i < ef->nreltab; i++) {
1238                 rel = ef->reltab[i].rel;
1239                 if (rel == NULL)
1240                         panic("lost a reltab!");
1241                 rellim = rel + ef->reltab[i].nrel;
1242                 base = findbase(ef, ef->reltab[i].sec);
1243                 if (base == 0)
1244                         panic("lost base for reltab");
1245                 for ( ; rel < rellim; rel++) {
1246                         symidx = ELF_R_SYM(rel->r_info);
1247                         if (symidx >= ef->ddbsymcnt)
1248                                 continue;
1249                         sym = ef->ddbsymtab + symidx;
1250                         /* Only do local relocs */
1251                         if (ELF_ST_BIND(sym->st_info) != STB_LOCAL)
1252                                 continue;
1253                         elf_reloc_local(lf, base, rel, ELF_RELOC_REL,
1254                             elf_obj_lookup);
1255                 }
1256         }
1257
1258         /* Perform relocations with addend if there are any: */
1259         for (i = 0; i < ef->nrelatab; i++) {
1260                 rela = ef->relatab[i].rela;
1261                 if (rela == NULL)
1262                         panic("lost a relatab!");
1263                 relalim = rela + ef->relatab[i].nrela;
1264                 base = findbase(ef, ef->relatab[i].sec);
1265                 if (base == 0)
1266                         panic("lost base for relatab");
1267                 for ( ; rela < relalim; rela++) {
1268                         symidx = ELF_R_SYM(rela->r_info);
1269                         if (symidx >= ef->ddbsymcnt)
1270                                 continue;
1271                         sym = ef->ddbsymtab + symidx;
1272                         /* Only do local relocs */
1273                         if (ELF_ST_BIND(sym->st_info) != STB_LOCAL)
1274                                 continue;
1275                         elf_reloc_local(lf, base, rela, ELF_RELOC_RELA,
1276                             elf_obj_lookup);
1277                 }
1278         }
1279 }