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         /* XXX Hack for firmware loading where p == NULL */
 414         if (p == NULL) {
 415                 p = &proc0;
 416         }
 417
 418         KKASSERT(p != NULL);
 419         if (p->p_ucred == NULL) {
 420                 kprintf("link_elf_obj_load_file: cannot load '%s' from filesystem"
 421                         " this early\n", filename);
 422                 return ENOENT;
 423         }
 424         shdr = NULL;
 425         lf = NULL;
 426         mapsize = 0;
 427         hdr = NULL;
 428         pathname = linker_search_path(filename);
 429         if (pathname == NULL)
 430                 return ENOENT;
 431
 432         error = nlookup_init(&nd, pathname, UIO_SYSSPACE, NLC_FOLLOW | NLC_LOCKVP);
 433         if (error == 0)
 434                 error = vn_open(&nd, NULL, FREAD, 0);
 435         kfree(pathname, M_LINKER);
 436         if (error) {
 437                 nlookup_done(&nd);
 438                 return error;
 439         }
 440         vp = nd.nl_open_vp;
 441         nd.nl_open_vp = NULL;
 442         nlookup_done(&nd);
 443
 444         /*
 445          * Read the elf header from the file.
 446          */
 447         hdr = kmalloc(sizeof(*hdr), M_LINKER, M_WAITOK);
 448         if (hdr == NULL) {
 449                 error = ENOMEM;
 450                 goto out;
 451         }
 452         error = vn_rdwr(UIO_READ, vp, (void *)hdr, sizeof(*hdr), 0,
 453                         UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
 454         if (error)
 455                 goto out;
 456         if (resid != 0) {
 457                 error = ENOEXEC;
 458                 goto out;
 459         }
 460         if (!IS_ELF(*hdr)) {
 461                 error = ENOEXEC;
 462                 goto out;
 463         }
 464
 465         if (hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS
 466             || hdr->e_ident[EI_DATA] != ELF_TARG_DATA) {
 467                 link_elf_obj_error(filename, "Unsupported file layout");
 468                 error = ENOEXEC;
 469                 goto out;
 470         }
 471         if (hdr->e_ident[EI_VERSION] != EV_CURRENT
 472             || hdr->e_version != EV_CURRENT) {
 473                 link_elf_obj_error(filename, "Unsupported file version");
 474                 error = ENOEXEC;
 475                 goto out;
 476         }
 477         if (hdr->e_type != ET_REL) {
 478                 error = ENOSYS;
 479                 goto out;
 480         }
 481         if (hdr->e_machine != ELF_TARG_MACH) {
 482                 link_elf_obj_error(filename, "Unsupported machine");
 483                 error = ENOEXEC;
 484                 goto out;
 485         }
 486
 487         ef = kmalloc(sizeof(struct elf_file), M_LINKER, M_WAITOK | M_ZERO);
 488         lf = linker_make_file(filename, ef, &link_elf_obj_file_ops);
 489         if (lf == NULL) {
 490                 kfree(ef, M_LINKER);
 491                 error = ENOMEM;
 492                 goto out;
 493         }
 494         ef->nprogtab = 0;
 495         ef->e_shdr = 0;
 496         ef->nreltab = 0;
 497         ef->nrelatab = 0;
 498
 499         /* Allocate and read in the section header */
 500         nbytes = hdr->e_shnum * hdr->e_shentsize;
 501         if (nbytes == 0 || hdr->e_shoff == 0 ||
 502             hdr->e_shentsize != sizeof(Elf_Shdr)) {
 503                 error = ENOEXEC;
 504                 goto out;
 505         }
 506         shdr = kmalloc(nbytes, M_LINKER, M_WAITOK);
 507         if (shdr == NULL) {
 508                 error = ENOMEM;
 509                 goto out;
 510         }
 511         ef->e_shdr = shdr;
 512         error = vn_rdwr(UIO_READ, vp, (caddr_t) shdr, nbytes, hdr->e_shoff,
 513                         UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
 514         if (error)
 515                 goto out;
 516         if (resid) {
 517                 error = ENOEXEC;
 518                 goto out;
 519         }
 520         /* Scan the section header for information and table sizing. */
 521         nsym = 0;
 522         symtabindex = -1;
 523         symstrindex = -1;
 524         for (i = 0; i < hdr->e_shnum; i++) {
 525                 switch (shdr[i].sh_type) {
 526                 case SHT_PROGBITS:
 527                 case SHT_NOBITS:
 528                         ef->nprogtab++;
 529                         break;
 530                 case SHT_SYMTAB:
 531                         nsym++;
 532                         symtabindex = i;
 533                         symstrindex = shdr[i].sh_link;
 534                         break;
 535                 case SHT_REL:
 536                         ef->nreltab++;
 537                         break;
 538                 case SHT_RELA:
 539                         ef->nrelatab++;
 540                         break;
 541                 case SHT_STRTAB:
 542                         break;
 543                 }
 544         }
 545         if (ef->nprogtab == 0) {
 546                 link_elf_obj_error(filename, "file has no contents");
 547                 error = ENOEXEC;
 548                 goto out;
 549         }
 550         if (nsym != 1) {
 551                 /* Only allow one symbol table for now */
 552                 link_elf_obj_error(filename, "file has no valid symbol table");
 553                 error = ENOEXEC;
 554                 goto out;
 555         }
 556         if (symstrindex < 0 || symstrindex > hdr->e_shnum ||
 557             shdr[symstrindex].sh_type != SHT_STRTAB) {
 558                 link_elf_obj_error(filename, "file has invalid symbol strings");
 559                 error = ENOEXEC;
 560                 goto out;
 561         }
 562         /* Allocate space for tracking the load chunks */
 563         if (ef->nprogtab != 0)
 564                 ef->progtab = kmalloc(ef->nprogtab * sizeof(*ef->progtab),
 565                                       M_LINKER, M_WAITOK | M_ZERO);
 566         if (ef->nreltab != 0)
 567                 ef->reltab = kmalloc(ef->nreltab * sizeof(*ef->reltab),
 568                                      M_LINKER, M_WAITOK | M_ZERO);
 569         if (ef->nrelatab != 0)
 570                 ef->relatab = kmalloc(ef->nrelatab * sizeof(*ef->relatab),
 571                                       M_LINKER, M_WAITOK | M_ZERO);
 572         if ((ef->nprogtab != 0 && ef->progtab == NULL) ||
 573             (ef->nreltab != 0 && ef->reltab == NULL) ||
 574             (ef->nrelatab != 0 && ef->relatab == NULL)) {
 575                 error = ENOMEM;
 576                 goto out;
 577         }
 578         if (symtabindex == -1)
 579                 panic("lost symbol table index");
 580         /* Allocate space for and load the symbol table */
 581         ef->ddbsymcnt = shdr[symtabindex].sh_size / sizeof(Elf_Sym);
 582         ef->ddbsymtab = kmalloc(shdr[symtabindex].sh_size, M_LINKER, M_WAITOK);
 583         if (ef->ddbsymtab == NULL) {
 584                 error = ENOMEM;
 585                 goto out;
 586         }
 587         error = vn_rdwr(UIO_READ, vp, (void *)ef->ddbsymtab,
 588                         shdr[symtabindex].sh_size, shdr[symtabindex].sh_offset,
 589                         UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
 590         if (error)
 591                 goto out;
 592         if (resid != 0) {
 593                 error = EINVAL;
 594                 goto out;
 595         }
 596         if (symstrindex == -1)
 597                 panic("lost symbol string index");
 598         /* Allocate space for and load the symbol strings */
 599         ef->ddbstrcnt = shdr[symstrindex].sh_size;
 600         ef->ddbstrtab = kmalloc(shdr[symstrindex].sh_size, M_LINKER, M_WAITOK);
 601         if (ef->ddbstrtab == NULL) {
 602                 error = ENOMEM;
 603                 goto out;
 604         }
 605         error = vn_rdwr(UIO_READ, vp, ef->ddbstrtab,
 606                         shdr[symstrindex].sh_size, shdr[symstrindex].sh_offset,
 607                         UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
 608         if (error)
 609                 goto out;
 610         if (resid != 0) {
 611                 error = EINVAL;
 612                 goto out;
 613         }
 614         /* Do we have a string table for the section names?  */
 615         shstrindex = -1;
 616         if (hdr->e_shstrndx != 0 &&
 617             shdr[hdr->e_shstrndx].sh_type == SHT_STRTAB) {
 618                 shstrindex = hdr->e_shstrndx;
 619                 ef->shstrcnt = shdr[shstrindex].sh_size;
 620                 ef->shstrtab = kmalloc(shdr[shstrindex].sh_size, M_LINKER,
 621                                        M_WAITOK);
 622                 if (ef->shstrtab == NULL) {
 623                         error = ENOMEM;
 624                         goto out;
 625                 }
 626                 error = vn_rdwr(UIO_READ, vp, ef->shstrtab,
 627                                 shdr[shstrindex].sh_size, shdr[shstrindex].sh_offset,
 628                                 UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid);
 629                 if (error)
 630                         goto out;
 631                 if (resid != 0) {
 632                         error = EINVAL;
 633                         goto out;
 634                 }
 635         }
 636         /* Size up code/data(progbits) and bss(nobits). */
 637         alignmask = 0;
 638         for (i = 0; i < hdr->e_shnum; i++) {
 639                 switch (shdr[i].sh_type) {
 640                 case SHT_PROGBITS:
 641                 case SHT_NOBITS:
 642                         alignmask = shdr[i].sh_addralign - 1;
 643                         mapsize += alignmask;
 644                         mapsize &= ~alignmask;
 645                         mapsize += shdr[i].sh_size;
 646                         break;
 647                 }
 648         }
 649
 650         /*
 651          * We know how much space we need for the text/data/bss/etc. This
 652          * stuff needs to be in a single chunk so that profiling etc can get
 653          * the bounds and gdb can associate offsets with modules
 654          */
 655         ef->object = vm_object_allocate(OBJT_DEFAULT,
 656                                         round_page(mapsize) >> PAGE_SHIFT);
 657         if (ef->object == NULL) {
 658                 error = ENOMEM;
 659                 goto out;
 660         }
 661         ef->address = (caddr_t) vm_map_min(&kernel_map);
 662
 663         /*
 664          * In order to satisfy x86_64's architectural requirements on the
 665          * location of code and data in the kernel's address space, request a
 666          * mapping that is above the kernel.
 667          */
 668         mapbase = KERNBASE;
 669         error = vm_map_find(&kernel_map, ef->object, 0, &mapbase,
 670                             round_page(mapsize), PAGE_SIZE,
 671                             TRUE, VM_MAPTYPE_NORMAL,
 672                             VM_PROT_ALL, VM_PROT_ALL, FALSE);
 673         if (error) {
 674                 vm_object_deallocate(ef->object);
 675                 ef->object = 0;
 676                 goto out;
 677         }
 678         /* Wire the pages */
 679         error = vm_map_wire(&kernel_map, mapbase,
 680                             mapbase + round_page(mapsize), 0);
 681         if (error != KERN_SUCCESS) {
 682                 error = ENOMEM;
 683                 goto out;
 684         }
 685         /* Inform the kld system about the situation */
 686         lf->address = ef->address = (caddr_t) mapbase;
 687         lf->size = mapsize;
 688
 689         /*
 690          * Now load code/data(progbits), zero bss(nobits), allocate space for
 691          * and load relocs
 692          */
 693         pb = 0;
 694         rl = 0;
 695         ra = 0;
 696         alignmask = 0;
 697         for (i = 0; i < hdr->e_shnum; i++) {
 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)\n",
 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);
 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                 vm_map_remove(&kernel_map, (vm_offset_t) ef->address,
 901                     (vm_offset_t) ef->address +
 902                     (ef->object->size << PAGE_SHIFT));
 903         }
 904         if (ef->e_shdr)
 905                 kfree(ef->e_shdr, M_LINKER);
 906         if (ef->ddbsymtab)
 907                 kfree(ef->ddbsymtab, M_LINKER);
 908         if (ef->ddbstrtab)
 909                 kfree(ef->ddbstrtab, M_LINKER);
 910         if (ef->shstrtab)
 911                 kfree(ef->shstrtab, M_LINKER);
 912         if (ef->ctftab)
 913                 kfree(ef->ctftab, M_LINKER);
 914         if (ef->ctfoff)
 915                 kfree(ef->ctfoff, M_LINKER);
 916         if (ef->typoff)
 917                 kfree(ef->typoff, M_LINKER);
 918         kfree(ef, M_LINKER);
 919 }
 920
 921 static const char *
 922 symbol_name(elf_file_t ef, Elf_Size r_info)
 923 {
 924         const Elf_Sym  *ref;
 925
 926         if (ELF_R_SYM(r_info)) {
 927                 ref = ef->ddbsymtab + ELF_R_SYM(r_info);
 928                 return ef->ddbstrtab + ref->st_name;
 929         } else
 930                 return NULL;
 931 }
 932
 933 static Elf_Addr
 934 findbase(elf_file_t ef, int sec)
 935 {
 936         int i;
 937         Elf_Addr base = 0;
 938
 939         for (i = 0; i < ef->nprogtab; i++) {
 940                 if (sec == ef->progtab[i].sec) {
 941                         base = (Elf_Addr)ef->progtab[i].addr;
 942                         break;
 943                 }
 944         }
 945         return base;
 946 }
 947
 948 static int
 949 relocate_file(linker_file_t lf)
 950 {
 951         elf_file_t      ef = lf->priv;
 952         const Elf_Rel *rellim;
 953         const Elf_Rel *rel;
 954         const Elf_Rela *relalim;
 955         const Elf_Rela *rela;
 956         const char *symname;
 957         const Elf_Sym *sym;
 958         int i;
 959         Elf_Size symidx;
 960         Elf_Addr base;
 961
 962         /* Perform relocations without addend if there are any: */
 963         for (i = 0; i < ef->nreltab; i++) {
 964                 rel = ef->reltab[i].rel;
 965                 if (rel == NULL)
 966                         panic("lost a reltab!");
 967                 rellim = rel + ef->reltab[i].nrel;
 968                 base = findbase(ef, ef->reltab[i].sec);
 969                 if (base == 0)
 970                         panic("lost base for reltab");
 971                 for ( ; rel < rellim; rel++) {
 972                         symidx = ELF_R_SYM(rel->r_info);
 973                         if (symidx >= ef->ddbsymcnt)
 974                                 continue;
 975                         sym = ef->ddbsymtab + symidx;
 976                         /* Local relocs are already done */
 977                         if (ELF_ST_BIND(sym->st_info) == STB_LOCAL)
 978                                 continue;
 979                         if (elf_reloc(lf, base, rel, ELF_RELOC_REL,
 980                             elf_obj_lookup)) {
 981                                 symname = symbol_name(ef, rel->r_info);
 982                                 kprintf("link_elf_obj_obj: symbol %s undefined\n",
 983                                     symname);
 984                                 return ENOENT;
 985                         }
 986                 }
 987         }
 988
 989         /* Perform relocations with addend if there are any: */
 990         for (i = 0; i < ef->nrelatab; i++) {
 991                 rela = ef->relatab[i].rela;
 992                 if (rela == NULL)
 993                         panic("lost a relatab!");
 994                 relalim = rela + ef->relatab[i].nrela;
 995                 base = findbase(ef, ef->relatab[i].sec);
 996                 if (base == 0)
 997                         panic("lost base for relatab");
 998                 for ( ; rela < relalim; rela++) {
 999                         symidx = ELF_R_SYM(rela->r_info);
1000                         if (symidx >= ef->ddbsymcnt)
1001                                 continue;
1002                         sym = ef->ddbsymtab + symidx;
1003                         /* Local relocs are already done */
1004                         if (ELF_ST_BIND(sym->st_info) == STB_LOCAL)
1005                                 continue;
1006                         if (elf_reloc(lf, base, rela, ELF_RELOC_RELA,
1007                             elf_obj_lookup)) {
1008                                 symname = symbol_name(ef, rela->r_info);
1009                                 kprintf("link_elf_obj_obj: symbol %s undefined\n",
1010                                     symname);
1011                                 return ENOENT;
1012                         }
1013                 }
1014         }
1015
1016         return 0;
1017 }
1018
1019 static int
1020 link_elf_obj_lookup_symbol(linker_file_t lf, const char *name, c_linker_sym_t *sym)
1021 {
1022         elf_file_t ef = lf->priv;
1023         const Elf_Sym *symp;
1024         const char *strp;
1025         int i;
1026
1027         for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) {
1028                 strp = ef->ddbstrtab + symp->st_name;
1029                 if (symp->st_shndx != SHN_UNDEF && strcmp(name, strp) == 0) {
1030                         *sym = (c_linker_sym_t) symp;
1031                         return 0;
1032                 }
1033         }
1034         return ENOENT;
1035 }
1036
1037 static int
1038 link_elf_obj_symbol_values(linker_file_t lf, c_linker_sym_t sym,
1039     linker_symval_t *symval)
1040 {
1041         elf_file_t ef = lf->priv;
1042         const Elf_Sym *es = (const Elf_Sym*) sym;
1043
1044         if (es >= ef->ddbsymtab && es < (ef->ddbsymtab + ef->ddbsymcnt)) {
1045                 symval->name = ef->ddbstrtab + es->st_name;
1046                 symval->value = (caddr_t)es->st_value;
1047                 symval->size = es->st_size;
1048                 return 0;
1049         }
1050         return ENOENT;
1051 }
1052
1053 static int
1054 link_elf_obj_search_symbol(linker_file_t lf, caddr_t value,
1055     c_linker_sym_t *sym, long *diffp)
1056 {
1057         elf_file_t ef = lf->priv;
1058         u_long off = (uintptr_t) (void *) value;
1059         u_long diff = off;
1060         u_long st_value;
1061         const Elf_Sym *es;
1062         const Elf_Sym *best = 0;
1063         int i;
1064
1065         for (i = 0, es = ef->ddbsymtab; i < ef->ddbsymcnt; i++, es++) {
1066                 if (es->st_name == 0)
1067                         continue;
1068                 st_value = es->st_value;
1069                 if (off >= st_value) {
1070                         if (off - st_value < diff) {
1071                                 diff = off - st_value;
1072                                 best = es;
1073                                 if (diff == 0)
1074                                         break;
1075                         } else if (off - st_value == diff) {
1076                                 best = es;
1077                         }
1078                 }
1079         }
1080         if (best == 0)
1081                 *diffp = off;
1082         else
1083                 *diffp = diff;
1084         *sym = (c_linker_sym_t) best;
1085
1086         return 0;
1087 }
1088
1089 /*
1090  * Look up a linker set on an ELF system.
1091  */
1092 static int
1093 link_elf_obj_lookup_set(linker_file_t lf, const char *name,
1094     void ***startp, void ***stopp, int *countp)
1095 {
1096         elf_file_t ef = lf->priv;
1097         void **start, **stop;
1098         int i, count;
1099
1100         /* Relative to section number */
1101         for (i = 0; i < ef->nprogtab; i++) {
1102                 if ((strncmp(ef->progtab[i].name, "set_", 4) == 0) &&
1103                     strcmp(ef->progtab[i].name + 4, name) == 0) {
1104                         start  = (void **)ef->progtab[i].addr;
1105                         stop = (void **)((char *)ef->progtab[i].addr +
1106                             ef->progtab[i].size);
1107                         count = stop - start;
1108                         if (startp)
1109                                 *startp = start;
1110                         if (stopp)
1111                                 *stopp = stop;
1112                         if (countp)
1113                                 *countp = count;
1114                         return (0);
1115                 }
1116         }
1117         return (ESRCH);
1118 }
1119
1120 /*
1121  * Symbol lookup function that can be used when the symbol index is known (ie
1122  * in relocations). It uses the symbol index instead of doing a fully fledged
1123  * hash table based lookup when such is valid. For example for local symbols.
1124  * This is not only more efficient, it's also more correct. It's not always
1125  * the case that the symbol can be found through the hash table.
1126  */
1127 static int
1128 elf_obj_lookup(linker_file_t lf, Elf_Size symidx, int deps, Elf_Addr *result)
1129 {
1130         elf_file_t ef = lf->priv;
1131         const Elf_Sym *sym;
1132         const char *symbol;
1133
1134         /* Don't even try to lookup the symbol if the index is bogus. */
1135         if (symidx >= ef->ddbsymcnt)
1136                 return (ENOENT);
1137
1138         sym = ef->ddbsymtab + symidx;
1139
1140         /* Quick answer if there is a definition included. */
1141         if (sym->st_shndx != SHN_UNDEF) {
1142                 *result = sym->st_value;
1143                 return (0);
1144         }
1145
1146         /* If we get here, then it is undefined and needs a lookup. */
1147         switch (ELF_ST_BIND(sym->st_info)) {
1148         case STB_LOCAL:
1149                 /* Local, but undefined? huh? */
1150                 return (ENOENT);
1151
1152         case STB_GLOBAL:
1153                 /* Relative to Data or Function name */
1154                 symbol = ef->ddbstrtab + sym->st_name;
1155
1156                 /* Force a lookup failure if the symbol name is bogus. */
1157                 if (*symbol == 0)
1158                         return (ENOENT);
1159                 return (linker_file_lookup_symbol(lf, symbol, deps, (caddr_t *)result));
1160
1161         case STB_WEAK:
1162                 kprintf("link_elf_obj_obj: Weak symbols not supported\n");
1163                 return (ENOENT);
1164
1165         default:
1166                 return (ENOENT);
1167         }
1168 }
1169
1170 static void
1171 link_elf_obj_fix_link_set(elf_file_t ef)
1172 {
1173         static const char startn[] = "__start_";
1174         static const char stopn[] = "__stop_";
1175         Elf_Sym *sym;
1176         const char *sym_name, *linkset_name;
1177         Elf_Addr startp, stopp;
1178         Elf_Size symidx;
1179         int start, i;
1180
1181         startp = stopp = 0;
1182         for (symidx = 1 /* zero entry is special */;
1183                 symidx < ef->ddbsymcnt; symidx++) {
1184                 sym = ef->ddbsymtab + symidx;
1185                 if (sym->st_shndx != SHN_UNDEF)
1186                         continue;
1187
1188                 sym_name = ef->ddbstrtab + sym->st_name;
1189                 if (strncmp(sym_name, startn, sizeof(startn) - 1) == 0) {
1190                         start = 1;
1191                         linkset_name = sym_name + sizeof(startn) - 1;
1192                 }
1193                 else if (strncmp(sym_name, stopn, sizeof(stopn) - 1) == 0) {
1194                         start = 0;
1195                         linkset_name = sym_name + sizeof(stopn) - 1;
1196                 }
1197                 else
1198                         continue;
1199
1200                 for (i = 0; i < ef->nprogtab; i++) {
1201                         if (strcmp(ef->progtab[i].name, linkset_name) == 0) {
1202                                 startp = (Elf_Addr)ef->progtab[i].addr;
1203                                 stopp = (Elf_Addr)(startp + ef->progtab[i].size);
1204                                 break;
1205                         }
1206                 }
1207                 if (i == ef->nprogtab)
1208                         continue;
1209
1210                 sym->st_value = start ? startp : stopp;
1211                 sym->st_shndx = i;
1212         }
1213 }
1214
1215 static void
1216 link_elf_obj_reloc_local(linker_file_t lf)
1217 {
1218         elf_file_t ef = lf->priv;
1219         const Elf_Rel *rellim;
1220         const Elf_Rel *rel;
1221         const Elf_Rela *relalim;
1222         const Elf_Rela *rela;
1223         const Elf_Sym *sym;
1224         Elf_Addr base;
1225         int i;
1226         Elf_Size symidx;
1227
1228         link_elf_obj_fix_link_set(ef);
1229
1230         /* Perform relocations without addend if there are any: */
1231         for (i = 0; i < ef->nreltab; i++) {
1232                 rel = ef->reltab[i].rel;
1233                 if (rel == NULL)
1234                         panic("lost a reltab!");
1235                 rellim = rel + ef->reltab[i].nrel;
1236                 base = findbase(ef, ef->reltab[i].sec);
1237                 if (base == 0)
1238                         panic("lost base for reltab");
1239                 for ( ; rel < rellim; rel++) {
1240                         symidx = ELF_R_SYM(rel->r_info);
1241                         if (symidx >= ef->ddbsymcnt)
1242                                 continue;
1243                         sym = ef->ddbsymtab + symidx;
1244                         /* Only do local relocs */
1245                         if (ELF_ST_BIND(sym->st_info) != STB_LOCAL)
1246                                 continue;
1247                         elf_reloc_local(lf, base, rel, ELF_RELOC_REL,
1248                             elf_obj_lookup);
1249                 }
1250         }
1251
1252         /* Perform relocations with addend if there are any: */
1253         for (i = 0; i < ef->nrelatab; i++) {
1254                 rela = ef->relatab[i].rela;
1255                 if (rela == NULL)
1256                         panic("lost a relatab!");
1257                 relalim = rela + ef->relatab[i].nrela;
1258                 base = findbase(ef, ef->relatab[i].sec);
1259                 if (base == 0)
1260                         panic("lost base for relatab");
1261                 for ( ; rela < relalim; rela++) {
1262                         symidx = ELF_R_SYM(rela->r_info);
1263                         if (symidx >= ef->ddbsymcnt)
1264                                 continue;
1265                         sym = ef->ddbsymtab + symidx;
1266                         /* Only do local relocs */
1267                         if (ELF_ST_BIND(sym->st_info) != STB_LOCAL)
1268                                 continue;
1269                         elf_reloc_local(lf, base, rela, ELF_RELOC_RELA,
1270                             elf_obj_lookup);
1271                 }
1272         }
1273 }