sys/kern/link_elf_obj.c

   1 /*-
   2  * Copyright (c) 1998 Doug Rabson
   3  * Copyright (c) 2004 Peter Wemm
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  25  * SUCH DAMAGE.
  26  *
  27  * $FreeBSD: src/sys/kern/link_elf.c,v 1.24 1999/12/24 15:33:36 bde Exp $
  28  * $DragonFly: src/sys/kern/link_elf.c,v 1.29 2008/08/01 23:11:16 dillon Exp $
  29  */
  30
  31 #include <sys/param.h>
  32 #include <sys/kernel.h>
  33 #include <sys/systm.h>
  34 #include <sys/malloc.h>
  35 #include <sys/proc.h>
  36 #include <sys/nlookup.h>
  37 #include <sys/fcntl.h>
  38 #include <sys/vnode.h>
  39 #include <sys/linker.h>
  40 #include <machine/elf.h>
  41
  42 #include <vm/vm.h>
  43 #include <vm/vm_param.h>
  44 #include <vm/vm_zone.h>
  45 #include <vm/vm_object.h>
  46 #include <vm/vm_kern.h>
  47 #include <vm/vm_extern.h>
  48 #include <sys/lock.h>
  49 #include <vm/pmap.h>
  50 #include <vm/vm_map.h>
  51
  52 static int      link_elf_obj_preload_file(const char *, linker_file_t *);
  53 static int      link_elf_obj_preload_finish(linker_file_t);
  54 static int      link_elf_obj_load_file(const char *, linker_file_t *);
  55 static int
  56 link_elf_obj_lookup_symbol(linker_file_t, const char *,
  57                        c_linker_sym_t *);
  58 static int      link_elf_obj_symbol_values(linker_file_t, c_linker_sym_t, linker_symval_t *);
  59 static int
  60 link_elf_obj_search_symbol(linker_file_t, caddr_t value,
  61                        c_linker_sym_t * sym, long *diffp);
  62
  63 static void     link_elf_obj_unload_file(linker_file_t);
  64 static int
  65 link_elf_obj_lookup_set(linker_file_t, const char *,
  66                     void ***, void ***, int *);
  67 static void     link_elf_obj_reloc_local(linker_file_t lf);
  68 static int elf_obj_lookup(linker_file_t lf, Elf_Size symidx, int deps, Elf_Addr *);
  69
  70 static struct linker_class_ops link_elf_obj_class_ops = {
  71         link_elf_obj_load_file,
  72         link_elf_obj_preload_file,
  73 };
  74
  75 static struct linker_file_ops link_elf_obj_file_ops = {
  76         .lookup_symbol = link_elf_obj_lookup_symbol,
  77         .symbol_values = link_elf_obj_symbol_values,
  78         .search_symbol = link_elf_obj_search_symbol,
  79         .preload_finish = link_elf_obj_preload_finish,
  80         .unload = link_elf_obj_unload_file,
  81         .lookup_set = link_elf_obj_lookup_set,
  82 };
  83
  84 typedef struct {
  85         void           *addr;
  86         Elf_Off         size;
  87         int             flags;
  88         int             sec;            /* Original section */
  89         char           *name;
  90 }               Elf_progent;
  91
  92 typedef struct {
  93         Elf_Rel        *rel;
  94         int             nrel;
  95         int             sec;
  96 }               Elf_relent;
  97
  98 typedef struct {
  99         Elf_Rela       *rela;
 100         int             nrela;
 101         int             sec;
 102 }               Elf_relaent;
 103
 104
 105 typedef struct elf_file {
 106         int             preloaded;
 107
 108         caddr_t         address;        /* Relocation address */
 109         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         lf = linker_make_file(filename, ef, &link_elf_obj_file_ops);
 202         if (lf == NULL) {
 203                 kfree(ef, M_LINKER);
 204                 return ENOMEM;
 205         }
 206         lf->address = ef->address;
 207         lf->size = *(size_t *) sizeptr;
 208
 209         if (hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS ||
 210             hdr->e_ident[EI_DATA] != ELF_TARG_DATA ||
 211             hdr->e_ident[EI_VERSION] != EV_CURRENT ||
 212             hdr->e_version != EV_CURRENT ||
 213             hdr->e_type != ET_REL ||
 214             hdr->e_machine != ELF_TARG_MACH) {
 215                 error = EFTYPE;
 216                 goto out;
 217         }
 218         ef->e_shdr = shdr;
 219
 220         /* Scan the section header for information and table sizing. */
 221         symtabindex = -1;
 222         symstrindex = -1;
 223         for (i = 0; i < hdr->e_shnum; i++) {
 224                 switch (shdr[i].sh_type) {
 225                 case SHT_PROGBITS:
 226                 case SHT_NOBITS:
 227                         ef->nprogtab++;
 228                         break;
 229                 case SHT_SYMTAB:
 230                         symtabindex = i;
 231                         symstrindex = shdr[i].sh_link;
 232                         break;
 233                 case SHT_REL:
 234                         ef->nreltab++;
 235                         break;
 236                 case SHT_RELA:
 237                         ef->nrelatab++;
 238                         break;
 239                 }
 240         }
 241
 242         shstrindex = hdr->e_shstrndx;
 243         if (ef->nprogtab == 0 || symstrindex < 0 ||
 244             symstrindex >= hdr->e_shnum ||
 245             shdr[symstrindex].sh_type != SHT_STRTAB || shstrindex == 0 ||
 246             shstrindex >= hdr->e_shnum ||
 247             shdr[shstrindex].sh_type != SHT_STRTAB) {
 248                 error = ENOEXEC;
 249                 goto out;
 250         }
 251         /* Allocate space for tracking the load chunks */
 252         if (ef->nprogtab != 0)
 253                 ef->progtab = kmalloc(ef->nprogtab * sizeof(*ef->progtab),
 254                                      M_LINKER, M_WAITOK | M_ZERO);
 255         if (ef->nreltab != 0)
 256                 ef->reltab = kmalloc(ef->nreltab * sizeof(*ef->reltab),
 257                                     M_LINKER, M_WAITOK | M_ZERO);
 258         if (ef->nrelatab != 0)
 259                 ef->relatab = kmalloc(ef->nrelatab * sizeof(*ef->relatab),
 260                                      M_LINKER, M_WAITOK | M_ZERO);
 261         if ((ef->nprogtab != 0 && ef->progtab == NULL) ||
 262             (ef->nreltab != 0 && ef->reltab == NULL) ||
 263             (ef->nrelatab != 0 && ef->relatab == NULL)) {
 264                 error = ENOMEM;
 265                 goto out;
 266         }
 267         /* XXX, relocate the sh_addr fields saved by the loader. */
 268         off = 0;
 269         for (i = 0; i < hdr->e_shnum; i++) {
 270                 if (shdr[i].sh_addr != 0 && (off == 0 || shdr[i].sh_addr < off))
 271                         off = shdr[i].sh_addr;
 272         }
 273         for (i = 0; i < hdr->e_shnum; i++) {
 274                 if (shdr[i].sh_addr != 0)
 275                         shdr[i].sh_addr = shdr[i].sh_addr - off +
 276                                 (Elf_Addr) ef->address;
 277         }
 278
 279         ef->ddbsymcnt = shdr[symtabindex].sh_size / sizeof(Elf_Sym);
 280         ef->ddbsymtab = (Elf_Sym *) shdr[symtabindex].sh_addr;
 281         ef->ddbstrcnt = shdr[symstrindex].sh_size;
 282         ef->ddbstrtab = (char *)shdr[symstrindex].sh_addr;
 283         ef->shstrcnt = shdr[shstrindex].sh_size;
 284         ef->shstrtab = (char *)shdr[shstrindex].sh_addr;
 285
 286         /* Now fill out progtab and the relocation tables. */
 287         pb = 0;
 288         rl = 0;
 289         ra = 0;
 290         for (i = 0; i < hdr->e_shnum; i++) {
 291                 switch (shdr[i].sh_type) {
 292                 case SHT_PROGBITS:
 293                 case SHT_NOBITS:
 294                         ef->progtab[pb].addr = (void *)shdr[i].sh_addr;
 295                         if (shdr[i].sh_type == SHT_PROGBITS)
 296                                 ef->progtab[pb].name = "<<PROGBITS>>";
 297                         else
 298                                 ef->progtab[pb].name = "<<NOBITS>>";
 299                         ef->progtab[pb].size = shdr[i].sh_size;
 300                         ef->progtab[pb].sec = i;
 301                         if (ef->shstrtab && shdr[i].sh_name != 0)
 302                                 ef->progtab[pb].name =
 303                                         ef->shstrtab + shdr[i].sh_name;
 304 #if 0
 305                         if (ef->progtab[pb].name != NULL &&
 306                             !strcmp(ef->progtab[pb].name, "set_pcpu")) {
 307                                 void           *dpcpu;
 308
 309                                 dpcpu = dpcpu_alloc(shdr[i].sh_size);
 310                                 if (dpcpu == NULL) {
 311                                         error = ENOSPC;
 312                                         goto out;
 313                                 }
 314                                 memcpy(dpcpu, ef->progtab[pb].addr,
 315                                        ef->progtab[pb].size);
 316                                 dpcpu_copy(dpcpu, shdr[i].sh_size);
 317                                 ef->progtab[pb].addr = dpcpu;
 318 #ifdef VIMAGE
 319                         } else if (ef->progtab[pb].name != NULL &&
 320                                    !strcmp(ef->progtab[pb].name, VNET_SETNAME)) {
 321                                 void           *vnet_data;
 322
 323                                 vnet_data = vnet_data_alloc(shdr[i].sh_size);
 324                                 if (vnet_data == NULL) {
 325                                         error = ENOSPC;
 326                                         goto out;
 327                                 }
 328                                 memcpy(vnet_data, ef->progtab[pb].addr,
 329                                        ef->progtab[pb].size);
 330                                 vnet_data_copy(vnet_data, shdr[i].sh_size);
 331                                 ef->progtab[pb].addr = vnet_data;
 332 #endif
 333                         }
 334 #endif
 335                         /* Update all symbol values with the offset. */
 336                         for (j = 0; j < ef->ddbsymcnt; j++) {
 337                                 es = &ef->ddbsymtab[j];
 338                                 if (es->st_shndx != i)
 339                                         continue;
 340                                 es->st_value += (Elf_Addr) ef->progtab[pb].addr;
 341                         }
 342                         pb++;
 343                         break;
 344                 case SHT_REL:
 345                         ef->reltab[rl].rel = (Elf_Rel *) shdr[i].sh_addr;
 346                         ef->reltab[rl].nrel = shdr[i].sh_size / sizeof(Elf_Rel);
 347                         ef->reltab[rl].sec = shdr[i].sh_info;
 348                         rl++;
 349                         break;
 350                 case SHT_RELA:
 351                         ef->relatab[ra].rela = (Elf_Rela *) shdr[i].sh_addr;
 352                         ef->relatab[ra].nrela =
 353                                 shdr[i].sh_size / sizeof(Elf_Rela);
 354                         ef->relatab[ra].sec = shdr[i].sh_info;
 355                         ra++;
 356                         break;
 357                 }
 358         }
 359         if (pb != ef->nprogtab)
 360                 panic("lost progbits");
 361         if (rl != ef->nreltab)
 362                 panic("lost reltab");
 363         if (ra != ef->nrelatab)
 364                 panic("lost relatab");
 365
 366         /* Local intra-module relocations */
 367         link_elf_obj_reloc_local(lf);
 368
 369         *result = lf;
 370         return (0);
 371
 372 out:
 373         /* preload not done this way */
 374         linker_file_unload(lf /* , LINKER_UNLOAD_FORCE */ );
 375         return (error);
 376 }
 377
 378 static int
 379 link_elf_obj_preload_finish(linker_file_t lf)
 380 {
 381         int error;
 382
 383         error = relocate_file(lf);
 384
 385         return (error);
 386 }
 387
 388 static int
 389 link_elf_obj_load_file(const char *filename, linker_file_t * result)
 390 {
 391         struct nlookupdata nd;
 392         struct thread  *td = curthread; /* XXX */
 393         struct proc    *p = td->td_proc;
 394         char           *pathname;
 395         struct vnode   *vp;
 396         Elf_Ehdr       *hdr;
 397         Elf_Shdr       *shdr;
 398         Elf_Sym        *es;
 399         int             nbytes, i, j;
 400         vm_offset_t     mapbase;
 401         size_t          mapsize;
 402         int             error = 0;
 403         int             resid;
 404         elf_file_t      ef;
 405         linker_file_t   lf;
 406         int             symtabindex;
 407         int             symstrindex;
 408         int             shstrindex;
 409         int             nsym;
 410         int             pb, rl, ra;
 411         int             alignmask;
 412
 413         KKASSERT(p != NULL);
 414         if (p->p_ucred == NULL) {
 415                 kprintf("link_elf_obj_load_file: cannot load '%s' from filesystem"
 416                         " this early\n", filename);
 417                 return ENOENT;
 418         }
 419         shdr = NULL;
 420         lf = NULL;
 421         mapsize = 0;
 422         hdr = NULL;
 423         pathname = linker_search_path(filename);
 424         if (pathname == NULL)
 425                 return ENOENT;
 426
 427         error = nlookup_init(&nd, pathname, UIO_SYSSPACE, NLC_FOLLOW | NLC_LOCKVP);
 428         if (error == 0)
 429                 error = vn_open(&nd, NULL, FREAD, 0);
 430         kfree(pathname, M_LINKER);
 431         if (error) {
 432                 nlookup_done(&nd);
 433                 return error;
 434         }
 435         vp = nd.nl_open_vp;
 436         nd.nl_open_vp = NULL;
 437         nlookup_done(&nd);
 438
 439         /*
 440          * Read the elf header from the file.
 441          */
 442         hdr = kmalloc(sizeof(*hdr), M_LINKER, M_WAITOK);
 443         if (hdr == NULL) {
 444                 error = ENOMEM;
 445                 goto out;
 446         }
 447         error = vn_rdwr(UIO_READ, vp, (void *)hdr, sizeof(*hdr), 0,
 448                         UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
 449         if (error)
 450                 goto out;
 451         if (resid != 0) {
 452                 error = ENOEXEC;
 453                 goto out;
 454         }
 455         if (!IS_ELF(*hdr)) {
 456                 error = ENOEXEC;
 457                 goto out;
 458         }
 459
 460         if (hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS
 461             || hdr->e_ident[EI_DATA] != ELF_TARG_DATA) {
 462                 link_elf_obj_error(filename, "Unsupported file layout");
 463                 error = ENOEXEC;
 464                 goto out;
 465         }
 466         if (hdr->e_ident[EI_VERSION] != EV_CURRENT
 467             || hdr->e_version != EV_CURRENT) {
 468                 link_elf_obj_error(filename, "Unsupported file version");
 469                 error = ENOEXEC;
 470                 goto out;
 471         }
 472         if (hdr->e_type != ET_REL) {
 473                 error = ENOSYS;
 474                 goto out;
 475         }
 476         if (hdr->e_machine != ELF_TARG_MACH) {
 477                 link_elf_obj_error(filename, "Unsupported machine");
 478                 error = ENOEXEC;
 479                 goto out;
 480         }
 481
 482         ef = kmalloc(sizeof(struct elf_file), M_LINKER, M_WAITOK | M_ZERO);
 483         lf = linker_make_file(filename, ef, &link_elf_obj_file_ops);
 484         if (lf == NULL) {
 485                 kfree(ef, M_LINKER);
 486                 error = ENOMEM;
 487                 goto out;
 488         }
 489         ef->nprogtab = 0;
 490         ef->e_shdr = 0;
 491         ef->nreltab = 0;
 492         ef->nrelatab = 0;
 493
 494         /* Allocate and read in the section header */
 495         nbytes = hdr->e_shnum * hdr->e_shentsize;
 496         if (nbytes == 0 || hdr->e_shoff == 0 ||
 497             hdr->e_shentsize != sizeof(Elf_Shdr)) {
 498                 error = ENOEXEC;
 499                 goto out;
 500         }
 501         shdr = kmalloc(nbytes, M_LINKER, M_WAITOK);
 502         if (shdr == NULL) {
 503                 error = ENOMEM;
 504                 goto out;
 505         }
 506         ef->e_shdr = shdr;
 507         error = vn_rdwr(UIO_READ, vp, (caddr_t) shdr, nbytes, hdr->e_shoff,
 508                         UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
 509         if (error)
 510                 goto out;
 511         if (resid) {
 512                 error = ENOEXEC;
 513                 goto out;
 514         }
 515         /* Scan the section header for information and table sizing. */
 516         nsym = 0;
 517         symtabindex = -1;
 518         symstrindex = -1;
 519         for (i = 0; i < hdr->e_shnum; i++) {
 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         if (ef->ddbsymtab == NULL) {
 579                 error = ENOMEM;
 580                 goto out;
 581         }
 582         error = vn_rdwr(UIO_READ, vp, (void *)ef->ddbsymtab,
 583                         shdr[symtabindex].sh_size, shdr[symtabindex].sh_offset,
 584                         UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
 585         if (error)
 586                 goto out;
 587         if (resid != 0) {
 588                 error = EINVAL;
 589                 goto out;
 590         }
 591         if (symstrindex == -1)
 592                 panic("lost symbol string index");
 593         /* Allocate space for and load the symbol strings */
 594         ef->ddbstrcnt = shdr[symstrindex].sh_size;
 595         ef->ddbstrtab = kmalloc(shdr[symstrindex].sh_size, M_LINKER, M_WAITOK);
 596         if (ef->ddbstrtab == NULL) {
 597                 error = ENOMEM;
 598                 goto out;
 599         }
 600         error = vn_rdwr(UIO_READ, vp, ef->ddbstrtab,
 601                         shdr[symstrindex].sh_size, shdr[symstrindex].sh_offset,
 602                         UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
 603         if (error)
 604                 goto out;
 605         if (resid != 0) {
 606                 error = EINVAL;
 607                 goto out;
 608         }
 609         /* Do we have a string table for the section names?  */
 610         shstrindex = -1;
 611         if (hdr->e_shstrndx != 0 &&
 612             shdr[hdr->e_shstrndx].sh_type == SHT_STRTAB) {
 613                 shstrindex = hdr->e_shstrndx;
 614                 ef->shstrcnt = shdr[shstrindex].sh_size;
 615                 ef->shstrtab = kmalloc(shdr[shstrindex].sh_size, M_LINKER,
 616                                        M_WAITOK);
 617                 if (ef->shstrtab == NULL) {
 618                         error = ENOMEM;
 619                         goto out;
 620                 }
 621                 error = vn_rdwr(UIO_READ, vp, ef->shstrtab,
 622                                 shdr[shstrindex].sh_size, shdr[shstrindex].sh_offset,
 623                                 UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
 624                 if (error)
 625                         goto out;
 626                 if (resid != 0) {
 627                         error = EINVAL;
 628                         goto out;
 629                 }
 630         }
 631         /* Size up code/data(progbits) and bss(nobits). */
 632         alignmask = 0;
 633         for (i = 0; i < hdr->e_shnum; i++) {
 634                 switch (shdr[i].sh_type) {
 635                 case SHT_PROGBITS:
 636                 case SHT_NOBITS:
 637                         alignmask = shdr[i].sh_addralign - 1;
 638                         mapsize += alignmask;
 639                         mapsize &= ~alignmask;
 640                         mapsize += shdr[i].sh_size;
 641                         break;
 642                 }
 643         }
 644
 645         /*
 646          * We know how much space we need for the text/data/bss/etc. This
 647          * stuff needs to be in a single chunk so that profiling etc can get
 648          * the bounds and gdb can associate offsets with modules
 649          */
 650         ef->object = vm_object_allocate(OBJT_DEFAULT,
 651                                         round_page(mapsize) >> PAGE_SHIFT);
 652         if (ef->object == NULL) {
 653                 error = ENOMEM;
 654                 goto out;
 655         }
 656         ef->address = (caddr_t) vm_map_min(&kernel_map);
 657
 658         /*
 659          * In order to satisfy amd64's architectural requirements on the
 660          * location of code and data in the kernel's address space, request a
 661          * mapping that is above the kernel.
 662          */
 663         mapbase = KERNBASE;
 664         error = vm_map_find(&kernel_map, ef->object, 0, &mapbase,
 665                             round_page(mapsize), TRUE, VM_MAPTYPE_NORMAL,
 666                             VM_PROT_ALL, VM_PROT_ALL, FALSE);
 667         if (error) {
 668                 vm_object_deallocate(ef->object);
 669                 ef->object = 0;
 670                 goto out;
 671         }
 672         /* Wire the pages */
 673         error = vm_map_wire(&kernel_map, mapbase,
 674                             mapbase + round_page(mapsize), 0);
 675         if (error != KERN_SUCCESS) {
 676                 error = ENOMEM;
 677                 goto out;
 678         }
 679         /* Inform the kld system about the situation */
 680         lf->address = ef->address = (caddr_t) mapbase;
 681         lf->size = mapsize;
 682
 683         /*
 684          * Now load code/data(progbits), zero bss(nobits), allocate space for
 685          * and load relocs
 686          */
 687         pb = 0;
 688         rl = 0;
 689         ra = 0;
 690         alignmask = 0;
 691         for (i = 0; i < hdr->e_shnum; i++) {
 692                 switch (shdr[i].sh_type) {
 693                 case SHT_PROGBITS:
 694                 case SHT_NOBITS:
 695                         alignmask = shdr[i].sh_addralign - 1;
 696                         mapbase += alignmask;
 697                         mapbase &= ~alignmask;
 698                         if (ef->shstrtab && shdr[i].sh_name != 0)
 699                                 ef->progtab[pb].name =
 700                                         ef->shstrtab + shdr[i].sh_name;
 701                         else if (shdr[i].sh_type == SHT_PROGBITS)
 702                                 ef->progtab[pb].name = "<<PROGBITS>>";
 703                         else
 704                                 ef->progtab[pb].name = "<<NOBITS>>";
 705 #if 0
 706                         if (ef->progtab[pb].name != NULL &&
 707                             !strcmp(ef->progtab[pb].name, "set_pcpu"))
 708                                 ef->progtab[pb].addr =
 709                                         dpcpu_alloc(shdr[i].sh_size);
 710 #ifdef VIMAGE
 711                         else if (ef->progtab[pb].name != NULL &&
 712                                  !strcmp(ef->progtab[pb].name, VNET_SETNAME))
 713                                 ef->progtab[pb].addr =
 714                                         vnet_data_alloc(shdr[i].sh_size);
 715 #endif
 716                         else
 717 #endif
 718                                 ef->progtab[pb].addr =
 719                                         (void *)(uintptr_t) mapbase;
 720                         if (ef->progtab[pb].addr == NULL) {
 721                                 error = ENOSPC;
 722                                 goto out;
 723                         }
 724                         ef->progtab[pb].size = shdr[i].sh_size;
 725                         ef->progtab[pb].sec = i;
 726                         if (shdr[i].sh_type == SHT_PROGBITS) {
 727                                 error = vn_rdwr(UIO_READ, vp,
 728                                                 ef->progtab[pb].addr,
 729                                                 shdr[i].sh_size, shdr[i].sh_offset,
 730                                                 UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred,
 731                                                 &resid);
 732                                 if (error)
 733                                         goto out;
 734                                 if (resid != 0) {
 735                                         error = EINVAL;
 736                                         goto out;
 737                                 }
 738 #if 0
 739                                 /* Initialize the per-cpu or vnet area. */
 740                                 if (ef->progtab[pb].addr != (void *)mapbase &&
 741                                     !strcmp(ef->progtab[pb].name, "set_pcpu"))
 742                                         dpcpu_copy(ef->progtab[pb].addr,
 743                                                    shdr[i].sh_size);
 744 #ifdef VIMAGE
 745                                 else if (ef->progtab[pb].addr !=
 746                                          (void *)mapbase &&
 747                                          !strcmp(ef->progtab[pb].name, VNET_SETNAME))
 748                                         vnet_data_copy(ef->progtab[pb].addr,
 749                                                        shdr[i].sh_size);
 750 #endif
 751 #endif
 752                         } else
 753                                 bzero(ef->progtab[pb].addr, shdr[i].sh_size);
 754
 755                         /* Update all symbol values with the offset. */
 756                         for (j = 0; j < ef->ddbsymcnt; j++) {
 757                                 es = &ef->ddbsymtab[j];
 758                                 if (es->st_shndx != i)
 759                                         continue;
 760                                 es->st_value += (Elf_Addr) ef->progtab[pb].addr;
 761                         }
 762                         mapbase += shdr[i].sh_size;
 763                         pb++;
 764                         break;
 765                 case SHT_REL:
 766                         ef->reltab[rl].rel = kmalloc(shdr[i].sh_size, M_LINKER, M_WAITOK);
 767                         ef->reltab[rl].nrel = shdr[i].sh_size / sizeof(Elf_Rel);
 768                         ef->reltab[rl].sec = shdr[i].sh_info;
 769                         error = vn_rdwr(UIO_READ, vp,
 770                                         (void *)ef->reltab[rl].rel,
 771                                         shdr[i].sh_size, shdr[i].sh_offset,
 772                                         UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
 773                         if (error)
 774                                 goto out;
 775                         if (resid != 0) {
 776                                 error = EINVAL;
 777                                 goto out;
 778                         }
 779                         rl++;
 780                         break;
 781                 case SHT_RELA:
 782                         ef->relatab[ra].rela = kmalloc(shdr[i].sh_size, M_LINKER, M_WAITOK);
 783                         ef->relatab[ra].nrela = shdr[i].sh_size / sizeof(Elf_Rela);
 784                         ef->relatab[ra].sec = shdr[i].sh_info;
 785                         error = vn_rdwr(UIO_READ, vp,
 786                                         (void *)ef->relatab[ra].rela,
 787                                         shdr[i].sh_size, shdr[i].sh_offset,
 788                                         UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
 789                         if (error)
 790                                 goto out;
 791                         if (resid != 0) {
 792                                 error = EINVAL;
 793                                 goto out;
 794                         }
 795                         ra++;
 796                         break;
 797                 }
 798         }
 799         if (pb != ef->nprogtab)
 800                 panic("lost progbits");
 801         if (rl != ef->nreltab)
 802                 panic("lost reltab");
 803         if (ra != ef->nrelatab)
 804                 panic("lost relatab");
 805         if (mapbase != (vm_offset_t) ef->address + mapsize)
 806                 panic("mapbase 0x%lx != address %p + mapsize 0x%lx (0x%lx)\n",
 807                       mapbase, ef->address, mapsize,
 808                       (vm_offset_t) ef->address + mapsize);
 809
 810         /* Local intra-module relocations */
 811         link_elf_obj_reloc_local(lf);
 812
 813         /* Pull in dependencies */
 814         error = linker_load_dependencies(lf);
 815         if (error)
 816                 goto out;
 817
 818         /* External relocations */
 819         error = relocate_file(lf);
 820         if (error)
 821                 goto out;
 822
 823         *result = lf;
 824
 825 out:
 826         if (error && lf)
 827                 linker_file_unload(lf /*, LINKER_UNLOAD_FORCE */);
 828         if (hdr)
 829                 kfree(hdr, M_LINKER);
 830         vn_unlock(vp);
 831         vn_close(vp, FREAD);
 832
 833         return error;
 834 }
 835
 836 static void
 837 link_elf_obj_unload_file(linker_file_t file)
 838 {
 839         elf_file_t      ef = file->priv;
 840         int i;
 841
 842         if (ef->progtab) {
 843                 for (i = 0; i < ef->nprogtab; i++) {
 844                         if (ef->progtab[i].size == 0)
 845                                 continue;
 846                         if (ef->progtab[i].name == NULL)
 847                                 continue;
 848 #if 0
 849                         if (!strcmp(ef->progtab[i].name, "set_pcpu"))
 850                                 dpcpu_free(ef->progtab[i].addr,
 851                                     ef->progtab[i].size);
 852 #ifdef VIMAGE
 853                         else if (!strcmp(ef->progtab[i].name, VNET_SETNAME))
 854                                 vnet_data_free(ef->progtab[i].addr,
 855                                     ef->progtab[i].size);
 856 #endif
 857 #endif
 858                 }
 859         }
 860         if (ef->preloaded) {
 861                 if (ef->reltab)
 862                         kfree(ef->reltab, M_LINKER);
 863                 if (ef->relatab)
 864                         kfree(ef->relatab, M_LINKER);
 865                 if (ef->progtab)
 866                         kfree(ef->progtab, M_LINKER);
 867                 if (ef->ctftab)
 868                         kfree(ef->ctftab, M_LINKER);
 869                 if (ef->ctfoff)
 870                         kfree(ef->ctfoff, M_LINKER);
 871                 if (ef->typoff)
 872                         kfree(ef->typoff, M_LINKER);
 873                 if (file->filename != NULL)
 874                         preload_delete_name(file->filename);
 875                 kfree(ef, M_LINKER);
 876                 /* XXX reclaim module memory? */
 877                 return;
 878         }
 879
 880         for (i = 0; i < ef->nreltab; i++)
 881                 if (ef->reltab[i].rel)
 882                         kfree(ef->reltab[i].rel, M_LINKER);
 883         for (i = 0; i < ef->nrelatab; i++)
 884                 if (ef->relatab[i].rela)
 885                         kfree(ef->relatab[i].rela, M_LINKER);
 886         if (ef->reltab)
 887                 kfree(ef->reltab, M_LINKER);
 888         if (ef->relatab)
 889                 kfree(ef->relatab, M_LINKER);
 890         if (ef->progtab)
 891                 kfree(ef->progtab, M_LINKER);
 892
 893         if (ef->object) {
 894                 vm_map_remove(&kernel_map, (vm_offset_t) ef->address,
 895                     (vm_offset_t) ef->address +
 896                     (ef->object->size << PAGE_SHIFT));
 897         }
 898         if (ef->e_shdr)
 899                 kfree(ef->e_shdr, M_LINKER);
 900         if (ef->ddbsymtab)
 901                 kfree(ef->ddbsymtab, M_LINKER);
 902         if (ef->ddbstrtab)
 903                 kfree(ef->ddbstrtab, M_LINKER);
 904         if (ef->shstrtab)
 905                 kfree(ef->shstrtab, M_LINKER);
 906         if (ef->ctftab)
 907                 kfree(ef->ctftab, M_LINKER);
 908         if (ef->ctfoff)
 909                 kfree(ef->ctfoff, M_LINKER);
 910         if (ef->typoff)
 911                 kfree(ef->typoff, M_LINKER);
 912         kfree(ef, M_LINKER);
 913 }
 914
 915 static const char *
 916 symbol_name(elf_file_t ef, Elf_Size r_info)
 917 {
 918         const Elf_Sym  *ref;
 919
 920         if (ELF_R_SYM(r_info)) {
 921                 ref = ef->ddbsymtab + ELF_R_SYM(r_info);
 922                 return ef->ddbstrtab + ref->st_name;
 923         } else
 924                 return NULL;
 925 }
 926
 927 static Elf_Addr
 928 findbase(elf_file_t ef, int sec)
 929 {
 930         int i;
 931         Elf_Addr base = 0;
 932
 933         for (i = 0; i < ef->nprogtab; i++) {
 934                 if (sec == ef->progtab[i].sec) {
 935                         base = (Elf_Addr)ef->progtab[i].addr;
 936                         break;
 937                 }
 938         }
 939         return base;
 940 }
 941
 942 static int
 943 relocate_file(linker_file_t lf)
 944 {
 945         elf_file_t      ef = lf->priv;
 946         const Elf_Rel *rellim;
 947         const Elf_Rel *rel;
 948         const Elf_Rela *relalim;
 949         const Elf_Rela *rela;
 950         const char *symname;
 951         const Elf_Sym *sym;
 952         int i;
 953         Elf_Size symidx;
 954         Elf_Addr base;
 955
 956         /* Perform relocations without addend if there are any: */
 957         for (i = 0; i < ef->nreltab; i++) {
 958                 rel = ef->reltab[i].rel;
 959                 if (rel == NULL)
 960                         panic("lost a reltab!");
 961                 rellim = rel + ef->reltab[i].nrel;
 962                 base = findbase(ef, ef->reltab[i].sec);
 963                 if (base == 0)
 964                         panic("lost base for reltab");
 965                 for ( ; rel < rellim; rel++) {
 966                         symidx = ELF_R_SYM(rel->r_info);
 967                         if (symidx >= ef->ddbsymcnt)
 968                                 continue;
 969                         sym = ef->ddbsymtab + symidx;
 970                         /* Local relocs are already done */
 971                         if (ELF_ST_BIND(sym->st_info) == STB_LOCAL)
 972                                 continue;
 973                         if (elf_reloc(lf, base, rel, ELF_RELOC_REL,
 974                             elf_obj_lookup)) {
 975                                 symname = symbol_name(ef, rel->r_info);
 976                                 kprintf("link_elf_obj_obj: symbol %s undefined\n",
 977                                     symname);
 978                                 return ENOENT;
 979                         }
 980                 }
 981         }
 982
 983         /* Perform relocations with addend if there are any: */
 984         for (i = 0; i < ef->nrelatab; i++) {
 985                 rela = ef->relatab[i].rela;
 986                 if (rela == NULL)
 987                         panic("lost a relatab!");
 988                 relalim = rela + ef->relatab[i].nrela;
 989                 base = findbase(ef, ef->relatab[i].sec);
 990                 if (base == 0)
 991                         panic("lost base for relatab");
 992                 for ( ; rela < relalim; rela++) {
 993                         symidx = ELF_R_SYM(rela->r_info);
 994                         if (symidx >= ef->ddbsymcnt)
 995                                 continue;
 996                         sym = ef->ddbsymtab + symidx;
 997                         /* Local relocs are already done */
 998                         if (ELF_ST_BIND(sym->st_info) == STB_LOCAL)
 999                                 continue;
1000                         if (elf_reloc(lf, base, rela, ELF_RELOC_RELA,
1001                             elf_obj_lookup)) {
1002                                 symname = symbol_name(ef, rela->r_info);
1003                                 kprintf("link_elf_obj_obj: symbol %s undefined\n",
1004                                     symname);
1005                                 return ENOENT;
1006                         }
1007                 }
1008         }
1009
1010         return 0;
1011 }
1012
1013 static int
1014 link_elf_obj_lookup_symbol(linker_file_t lf, const char *name, c_linker_sym_t *sym)
1015 {
1016         elf_file_t ef = lf->priv;
1017         const Elf_Sym *symp;
1018         const char *strp;
1019         int i;
1020
1021         for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) {
1022                 strp = ef->ddbstrtab + symp->st_name;
1023                 if (symp->st_shndx != SHN_UNDEF && strcmp(name, strp) == 0) {
1024                         *sym = (c_linker_sym_t) symp;
1025                         return 0;
1026                 }
1027         }
1028         return ENOENT;
1029 }
1030
1031 static int
1032 link_elf_obj_symbol_values(linker_file_t lf, c_linker_sym_t sym,
1033     linker_symval_t *symval)
1034 {
1035         elf_file_t ef = lf->priv;
1036         const Elf_Sym *es = (const Elf_Sym*) sym;
1037
1038         if (es >= ef->ddbsymtab && es < (ef->ddbsymtab + ef->ddbsymcnt)) {
1039                 symval->name = ef->ddbstrtab + es->st_name;
1040                 symval->value = (caddr_t)es->st_value;
1041                 symval->size = es->st_size;
1042                 return 0;
1043         }
1044         return ENOENT;
1045 }
1046
1047 static int
1048 link_elf_obj_search_symbol(linker_file_t lf, caddr_t value,
1049     c_linker_sym_t *sym, long *diffp)
1050 {
1051         elf_file_t ef = lf->priv;
1052         u_long off = (uintptr_t) (void *) value;
1053         u_long diff = off;
1054         u_long st_value;
1055         const Elf_Sym *es;
1056         const Elf_Sym *best = 0;
1057         int i;
1058
1059         for (i = 0, es = ef->ddbsymtab; i < ef->ddbsymcnt; i++, es++) {
1060                 if (es->st_name == 0)
1061                         continue;
1062                 st_value = es->st_value;
1063                 if (off >= st_value) {
1064                         if (off - st_value < diff) {
1065                                 diff = off - st_value;
1066                                 best = es;
1067                                 if (diff == 0)
1068                                         break;
1069                         } else if (off - st_value == diff) {
1070                                 best = es;
1071                         }
1072                 }
1073         }
1074         if (best == 0)
1075                 *diffp = off;
1076         else
1077                 *diffp = diff;
1078         *sym = (c_linker_sym_t) best;
1079
1080         return 0;
1081 }
1082
1083 /*
1084  * Look up a linker set on an ELF system.
1085  */
1086 static int
1087 link_elf_obj_lookup_set(linker_file_t lf, const char *name,
1088     void ***startp, void ***stopp, int *countp)
1089 {
1090         elf_file_t ef = lf->priv;
1091         void **start, **stop;
1092         int i, count;
1093
1094         /* Relative to section number */
1095         for (i = 0; i < ef->nprogtab; i++) {
1096                 if ((strncmp(ef->progtab[i].name, "set_", 4) == 0) &&
1097                     strcmp(ef->progtab[i].name + 4, name) == 0) {
1098                         start  = (void **)ef->progtab[i].addr;
1099                         stop = (void **)((char *)ef->progtab[i].addr +
1100                             ef->progtab[i].size);
1101                         count = stop - start;
1102                         if (startp)
1103                                 *startp = start;
1104                         if (stopp)
1105                                 *stopp = stop;
1106                         if (countp)
1107                                 *countp = count;
1108                         return (0);
1109                 }
1110         }
1111         return (ESRCH);
1112 }
1113
1114 /*
1115  * Symbol lookup function that can be used when the symbol index is known (ie
1116  * in relocations). It uses the symbol index instead of doing a fully fledged
1117  * hash table based lookup when such is valid. For example for local symbols.
1118  * This is not only more efficient, it's also more correct. It's not always
1119  * the case that the symbol can be found through the hash table.
1120  */
1121 static int
1122 elf_obj_lookup(linker_file_t lf, Elf_Size symidx, int deps, Elf_Addr *result)
1123 {
1124         elf_file_t ef = lf->priv;
1125         const Elf_Sym *sym;
1126         const char *symbol;
1127
1128         /* Don't even try to lookup the symbol if the index is bogus. */
1129         if (symidx >= ef->ddbsymcnt)
1130                 return (ENOENT);
1131
1132         sym = ef->ddbsymtab + symidx;
1133
1134         /* Quick answer if there is a definition included. */
1135         if (sym->st_shndx != SHN_UNDEF) {
1136                 *result = sym->st_value;
1137                 return (0);
1138         }
1139
1140         /* If we get here, then it is undefined and needs a lookup. */
1141         switch (ELF_ST_BIND(sym->st_info)) {
1142         case STB_LOCAL:
1143                 /* Local, but undefined? huh? */
1144                 return (ENOENT);
1145
1146         case STB_GLOBAL:
1147                 /* Relative to Data or Function name */
1148                 symbol = ef->ddbstrtab + sym->st_name;
1149
1150                 /* Force a lookup failure if the symbol name is bogus. */
1151                 if (*symbol == 0)
1152                         return (ENOENT);
1153                 return (linker_file_lookup_symbol(lf, symbol, deps, (caddr_t *)result));
1154
1155         case STB_WEAK:
1156                 kprintf("link_elf_obj_obj: Weak symbols not supported\n");
1157                 return (ENOENT);
1158
1159         default:
1160                 return (ENOENT);
1161         }
1162 }
1163
1164 static void
1165 link_elf_obj_fix_link_set(elf_file_t ef)
1166 {
1167         static const char startn[] = "__start_";
1168         static const char stopn[] = "__stop_";
1169         Elf_Sym *sym;
1170         const char *sym_name, *linkset_name;
1171         Elf_Addr startp, stopp;
1172         Elf_Size symidx;
1173         int start, i;
1174
1175         startp = stopp = 0;
1176         for (symidx = 1 /* zero entry is special */;
1177                 symidx < ef->ddbsymcnt; symidx++) {
1178                 sym = ef->ddbsymtab + symidx;
1179                 if (sym->st_shndx != SHN_UNDEF)
1180                         continue;
1181
1182                 sym_name = ef->ddbstrtab + sym->st_name;
1183                 if (strncmp(sym_name, startn, sizeof(startn) - 1) == 0) {
1184                         start = 1;
1185                         linkset_name = sym_name + sizeof(startn) - 1;
1186                 }
1187                 else if (strncmp(sym_name, stopn, sizeof(stopn) - 1) == 0) {
1188                         start = 0;
1189                         linkset_name = sym_name + sizeof(stopn) - 1;
1190                 }
1191                 else
1192                         continue;
1193
1194                 for (i = 0; i < ef->nprogtab; i++) {
1195                         if (strcmp(ef->progtab[i].name, linkset_name) == 0) {
1196                                 startp = (Elf_Addr)ef->progtab[i].addr;
1197                                 stopp = (Elf_Addr)(startp + ef->progtab[i].size);
1198                                 break;
1199                         }
1200                 }
1201                 if (i == ef->nprogtab)
1202                         continue;
1203
1204                 sym->st_value = start ? startp : stopp;
1205                 sym->st_shndx = i;
1206         }
1207 }
1208
1209 static void
1210 link_elf_obj_reloc_local(linker_file_t lf)
1211 {
1212         elf_file_t ef = lf->priv;
1213         const Elf_Rel *rellim;
1214         const Elf_Rel *rel;
1215         const Elf_Rela *relalim;
1216         const Elf_Rela *rela;
1217         const Elf_Sym *sym;
1218         Elf_Addr base;
1219         int i;
1220         Elf_Size symidx;
1221
1222         link_elf_obj_fix_link_set(ef);
1223
1224         /* Perform relocations without addend if there are any: */
1225         for (i = 0; i < ef->nreltab; i++) {
1226                 rel = ef->reltab[i].rel;
1227                 if (rel == NULL)
1228                         panic("lost a reltab!");
1229                 rellim = rel + ef->reltab[i].nrel;
1230                 base = findbase(ef, ef->reltab[i].sec);
1231                 if (base == 0)
1232                         panic("lost base for reltab");
1233                 for ( ; rel < rellim; rel++) {
1234                         symidx = ELF_R_SYM(rel->r_info);
1235                         if (symidx >= ef->ddbsymcnt)
1236                                 continue;
1237                         sym = ef->ddbsymtab + symidx;
1238                         /* Only do local relocs */
1239                         if (ELF_ST_BIND(sym->st_info) != STB_LOCAL)
1240                                 continue;
1241                         elf_reloc_local(lf, base, rel, ELF_RELOC_REL,
1242                             elf_obj_lookup);
1243                 }
1244         }
1245
1246         /* Perform relocations with addend if there are any: */
1247         for (i = 0; i < ef->nrelatab; i++) {
1248                 rela = ef->relatab[i].rela;
1249                 if (rela == NULL)
1250                         panic("lost a relatab!");
1251                 relalim = rela + ef->relatab[i].nrela;
1252                 base = findbase(ef, ef->relatab[i].sec);
1253                 if (base == 0)
1254                         panic("lost base for relatab");
1255                 for ( ; rela < relalim; rela++) {
1256                         symidx = ELF_R_SYM(rela->r_info);
1257                         if (symidx >= ef->ddbsymcnt)
1258                                 continue;
1259                         sym = ef->ddbsymtab + symidx;
1260                         /* Only do local relocs */
1261                         if (ELF_ST_BIND(sym->st_info) != STB_LOCAL)
1262                                 continue;
1263                         elf_reloc_local(lf, base, rela, ELF_RELOC_RELA,
1264                             elf_obj_lookup);
1265                 }
1266         }
1267 }