sys/kern/link_elf_obj.c

   1 /*-
   2  * Copyright (c) 1998-2000 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
  28 #include <sys/cdefs.h>
  29 __FBSDID("$FreeBSD$");
  30
  31 #include "opt_ddb.h"
  32 #include "opt_mac.h"
  33
  34 #include <sys/param.h>
  35 #include <sys/systm.h>
  36 #include <sys/kernel.h>
  37 #include <sys/lock.h>
  38 #include <sys/malloc.h>
  39 #include <sys/mutex.h>
  40 #include <sys/mount.h>
  41 #include <sys/proc.h>
  42 #include <sys/namei.h>
  43 #include <sys/fcntl.h>
  44 #include <sys/vnode.h>
  45 #include <sys/linker.h>
  46
  47 #include <machine/elf.h>
  48
  49 #include <security/mac/mac_framework.h>
  50
  51 #include <vm/vm.h>
  52 #include <vm/vm_param.h>
  53 #include <vm/vm_object.h>
  54 #include <vm/vm_kern.h>
  55 #include <vm/vm_extern.h>
  56 #include <vm/pmap.h>
  57 #include <vm/vm_map.h>
  58
  59 #include <sys/link_elf.h>
  60
  61 #ifdef DDB_CTF
  62 #include <net/zlib.h>
  63 #endif
  64
  65 #include "linker_if.h"
  66
  67 typedef struct {
  68         void            *addr;
  69         Elf_Off         size;
  70         int             flags;
  71         int             sec;    /* Original section */
  72         char            *name;
  73 } Elf_progent;
  74
  75 typedef struct {
  76         Elf_Rel         *rel;
  77         int             nrel;
  78         int             sec;
  79 } Elf_relent;
  80
  81 typedef struct {
  82         Elf_Rela        *rela;
  83         int             nrela;
  84         int             sec;
  85 } Elf_relaent;
  86
  87
  88 typedef struct elf_file {
  89         struct linker_file lf;          /* Common fields */
  90
  91         int             preloaded;
  92         caddr_t         address;        /* Relocation address */
  93         vm_object_t     object;         /* VM object to hold file pages */
  94         Elf_Shdr        *e_shdr;
  95
  96         Elf_progent     *progtab;
  97         int             nprogtab;
  98
  99         Elf_relaent     *relatab;
 100         int             nrelatab;
 101
 102         Elf_relent      *reltab;
 103         int             nreltab;
 104
 105         Elf_Sym         *ddbsymtab;     /* The symbol table we are using */
 106         long            ddbsymcnt;      /* Number of symbols */
 107         caddr_t         ddbstrtab;      /* String table */
 108         long            ddbstrcnt;      /* number of bytes in string table */
 109
 110         caddr_t         shstrtab;       /* Section name string table */
 111         long            shstrcnt;       /* number of bytes in string table */
 112
 113         caddr_t         ctftab;         /* CTF table */
 114         long            ctfcnt;         /* number of bytes in CTF table */
 115         caddr_t         ctfoff;         /* CTF offset table */
 116         caddr_t         typoff;         /* Type offset table */
 117         long            typlen;         /* Number of type entries. */
 118
 119 } *elf_file_t;
 120
 121 #include <kern/kern_ctf.c>
 122
 123 static int      link_elf_link_preload(linker_class_t cls,
 124                     const char *, linker_file_t *);
 125 static int      link_elf_link_preload_finish(linker_file_t);
 126 static int      link_elf_load_file(linker_class_t, const char *, linker_file_t *);
 127 static int      link_elf_lookup_symbol(linker_file_t, const char *,
 128                     c_linker_sym_t *);
 129 static int      link_elf_symbol_values(linker_file_t, c_linker_sym_t,
 130                     linker_symval_t *);
 131 static int      link_elf_search_symbol(linker_file_t, caddr_t value,
 132                     c_linker_sym_t *sym, long *diffp);
 133
 134 static void     link_elf_unload_file(linker_file_t);
 135 static int      link_elf_lookup_set(linker_file_t, const char *,
 136                     void ***, void ***, int *);
 137 static int      link_elf_each_function_name(linker_file_t,
 138                     int (*)(const char *, void *), void *);
 139 static int      link_elf_each_function_nameval(linker_file_t,
 140                                 linker_function_nameval_callback_t,
 141                                 void *);
 142 static void     link_elf_reloc_local(linker_file_t);
 143
 144 static Elf_Addr elf_obj_lookup(linker_file_t lf, Elf_Size symidx, int deps);
 145
 146 static kobj_method_t link_elf_methods[] = {
 147         KOBJMETHOD(linker_lookup_symbol,        link_elf_lookup_symbol),
 148         KOBJMETHOD(linker_symbol_values,        link_elf_symbol_values),
 149         KOBJMETHOD(linker_search_symbol,        link_elf_search_symbol),
 150         KOBJMETHOD(linker_unload,               link_elf_unload_file),
 151         KOBJMETHOD(linker_load_file,            link_elf_load_file),
 152         KOBJMETHOD(linker_link_preload,         link_elf_link_preload),
 153         KOBJMETHOD(linker_link_preload_finish,  link_elf_link_preload_finish),
 154         KOBJMETHOD(linker_lookup_set,           link_elf_lookup_set),
 155         KOBJMETHOD(linker_each_function_name,   link_elf_each_function_name),
 156         KOBJMETHOD(linker_each_function_nameval, link_elf_each_function_nameval),
 157         KOBJMETHOD(linker_ctf_get,              link_elf_ctf_get),
 158         { 0, 0 }
 159 };
 160
 161 static struct linker_class link_elf_class = {
 162 #if ELF_TARG_CLASS == ELFCLASS32
 163         "elf32_obj",
 164 #else
 165         "elf64_obj",
 166 #endif
 167         link_elf_methods, sizeof(struct elf_file)
 168 };
 169
 170 static int      relocate_file(elf_file_t ef);
 171
 172 static void
 173 link_elf_error(const char *filename, const char *s)
 174 {
 175         if (filename == NULL)
 176                 printf("kldload: %s\n", s);
 177         else
 178                 printf("kldload: %s: %s\n", filename, s);
 179 }
 180
 181 static void
 182 link_elf_init(void *arg)
 183 {
 184
 185         linker_add_class(&link_elf_class);
 186 }
 187
 188 SYSINIT(link_elf_obj, SI_SUB_KLD, SI_ORDER_SECOND, link_elf_init, 0);
 189
 190 static int
 191 link_elf_link_preload(linker_class_t cls, const char *filename,
 192     linker_file_t *result)
 193 {
 194         Elf_Ehdr *hdr;
 195         Elf_Shdr *shdr;
 196         Elf_Sym *es;
 197         void *modptr, *baseptr, *sizeptr;
 198         char *type;
 199         elf_file_t ef;
 200         linker_file_t lf;
 201         Elf_Addr off;
 202         int error, i, j, pb, ra, rl, shstrindex, symstrindex, symtabindex;
 203
 204         /* Look to see if we have the file preloaded */
 205         modptr = preload_search_by_name(filename);
 206         if (modptr == NULL)
 207                 return ENOENT;
 208
 209         type = (char *)preload_search_info(modptr, MODINFO_TYPE);
 210         baseptr = preload_search_info(modptr, MODINFO_ADDR);
 211         sizeptr = preload_search_info(modptr, MODINFO_SIZE);
 212         hdr = (Elf_Ehdr *)preload_search_info(modptr, MODINFO_METADATA |
 213             MODINFOMD_ELFHDR);
 214         shdr = (Elf_Shdr *)preload_search_info(modptr, MODINFO_METADATA |
 215             MODINFOMD_SHDR);
 216         if (type == NULL || (strcmp(type, "elf" __XSTRING(__ELF_WORD_SIZE)
 217             " obj module") != 0 &&
 218             strcmp(type, "elf obj module") != 0)) {
 219                 return (EFTYPE);
 220         }
 221         if (baseptr == NULL || sizeptr == NULL || hdr == NULL ||
 222             shdr == NULL)
 223                 return (EINVAL);
 224
 225         lf = linker_make_file(filename, &link_elf_class);
 226         if (lf == NULL)
 227                 return (ENOMEM);
 228
 229         ef = (elf_file_t)lf;
 230         ef->preloaded = 1;
 231         ef->address = *(caddr_t *)baseptr;
 232         lf->address = *(caddr_t *)baseptr;
 233         lf->size = *(size_t *)sizeptr;
 234
 235         if (hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS ||
 236             hdr->e_ident[EI_DATA] != ELF_TARG_DATA ||
 237             hdr->e_ident[EI_VERSION] != EV_CURRENT ||
 238             hdr->e_version != EV_CURRENT ||
 239             hdr->e_type != ET_REL ||
 240             hdr->e_machine != ELF_TARG_MACH) {
 241                 error = EFTYPE;
 242                 goto out;
 243         }
 244         ef->e_shdr = shdr;
 245
 246         /* Scan the section header for information and table sizing. */
 247         symtabindex = -1;
 248         symstrindex = -1;
 249         for (i = 0; i < hdr->e_shnum; i++) {
 250                 switch (shdr[i].sh_type) {
 251                 case SHT_PROGBITS:
 252                 case SHT_NOBITS:
 253                         ef->nprogtab++;
 254                         break;
 255                 case SHT_SYMTAB:
 256                         symtabindex = i;
 257                         symstrindex = shdr[i].sh_link;
 258                         break;
 259                 case SHT_REL:
 260                         ef->nreltab++;
 261                         break;
 262                 case SHT_RELA:
 263                         ef->nrelatab++;
 264                         break;
 265                 }
 266         }
 267
 268         shstrindex = hdr->e_shstrndx;
 269         if (ef->nprogtab == 0 || symstrindex < 0 ||
 270             symstrindex >= hdr->e_shnum ||
 271             shdr[symstrindex].sh_type != SHT_STRTAB || shstrindex == 0 ||
 272             shstrindex >= hdr->e_shnum ||
 273             shdr[shstrindex].sh_type != SHT_STRTAB) {
 274                 printf("%s: bad/missing section headers\n", filename);
 275                 error = ENOEXEC;
 276                 goto out;
 277         }
 278
 279         /* Allocate space for tracking the load chunks */
 280         if (ef->nprogtab != 0)
 281                 ef->progtab = malloc(ef->nprogtab * sizeof(*ef->progtab),
 282                     M_LINKER, M_WAITOK | M_ZERO);
 283         if (ef->nreltab != 0)
 284                 ef->reltab = malloc(ef->nreltab * sizeof(*ef->reltab),
 285                     M_LINKER, M_WAITOK | M_ZERO);
 286         if (ef->nrelatab != 0)
 287                 ef->relatab = malloc(ef->nrelatab * sizeof(*ef->relatab),
 288                     M_LINKER, M_WAITOK | M_ZERO);
 289         if ((ef->nprogtab != 0 && ef->progtab == NULL) ||
 290             (ef->nreltab != 0 && ef->reltab == NULL) ||
 291             (ef->nrelatab != 0 && ef->relatab == NULL)) {
 292                 error = ENOMEM;
 293                 goto out;
 294         }
 295
 296         /* XXX, relocate the sh_addr fields saved by the loader. */
 297         off = 0;
 298         for (i = 0; i < hdr->e_shnum; i++) {
 299                 if (shdr[i].sh_addr != 0 && (off == 0 || shdr[i].sh_addr < off))
 300                         off = shdr[i].sh_addr;
 301         }
 302         for (i = 0; i < hdr->e_shnum; i++) {
 303                 if (shdr[i].sh_addr != 0)
 304                         shdr[i].sh_addr = shdr[i].sh_addr - off +
 305                             (Elf_Addr)ef->address;
 306         }
 307
 308         ef->ddbsymcnt = shdr[symtabindex].sh_size / sizeof(Elf_Sym);
 309         ef->ddbsymtab = (Elf_Sym *)shdr[symtabindex].sh_addr;
 310         ef->ddbstrcnt = shdr[symstrindex].sh_size;
 311         ef->ddbstrtab = (char *)shdr[symstrindex].sh_addr;
 312         ef->shstrcnt = shdr[shstrindex].sh_size;
 313         ef->shstrtab = (char *)shdr[shstrindex].sh_addr;
 314
 315         /* Now fill out progtab and the relocation tables. */
 316         pb = 0;
 317         rl = 0;
 318         ra = 0;
 319         for (i = 0; i < hdr->e_shnum; i++) {
 320                 switch (shdr[i].sh_type) {
 321                 case SHT_PROGBITS:
 322                 case SHT_NOBITS:
 323                         ef->progtab[pb].addr = (void *)shdr[i].sh_addr;
 324                         if (shdr[i].sh_type == SHT_PROGBITS)
 325                                 ef->progtab[pb].name = "<<PROGBITS>>";
 326                         else
 327                                 ef->progtab[pb].name = "<<NOBITS>>";
 328                         ef->progtab[pb].size = shdr[i].sh_size;
 329                         ef->progtab[pb].sec = i;
 330                         if (ef->shstrtab && shdr[i].sh_name != 0)
 331                                 ef->progtab[pb].name =
 332                                     ef->shstrtab + shdr[i].sh_name;
 333
 334                         /* Update all symbol values with the offset. */
 335                         for (j = 0; j < ef->ddbsymcnt; j++) {
 336                                 es = &ef->ddbsymtab[j];
 337                                 if (es->st_shndx != i)
 338                                         continue;
 339                                 es->st_value += (Elf_Addr)ef->progtab[pb].addr;
 340                         }
 341                         pb++;
 342                         break;
 343                 case SHT_REL:
 344                         ef->reltab[rl].rel = (Elf_Rel *)shdr[i].sh_addr;
 345                         ef->reltab[rl].nrel = shdr[i].sh_size / sizeof(Elf_Rel);
 346                         ef->reltab[rl].sec = shdr[i].sh_info;
 347                         rl++;
 348                         break;
 349                 case SHT_RELA:
 350                         ef->relatab[ra].rela = (Elf_Rela *)shdr[i].sh_addr;
 351                         ef->relatab[ra].nrela =
 352                             shdr[i].sh_size / sizeof(Elf_Rela);
 353                         ef->relatab[ra].sec = shdr[i].sh_info;
 354                         ra++;
 355                         break;
 356                 }
 357         }
 358         if (pb != ef->nprogtab)
 359                 panic("lost progbits");
 360         if (rl != ef->nreltab)
 361                 panic("lost reltab");
 362         if (ra != ef->nrelatab)
 363                 panic("lost relatab");
 364
 365         /* Local intra-module relocations */
 366         link_elf_reloc_local(lf);
 367
 368         *result = lf;
 369         return (0);
 370
 371 out:
 372         /* preload not done this way */
 373         linker_file_unload(lf, LINKER_UNLOAD_FORCE);
 374         return (error);
 375 }
 376
 377 static int
 378 link_elf_link_preload_finish(linker_file_t lf)
 379 {
 380         elf_file_t ef;
 381         int error;
 382
 383         ef = (elf_file_t)lf;
 384         error = relocate_file(ef);
 385         if (error)
 386                 return error;
 387
 388         /* Notify MD code that a module is being loaded. */
 389         error = elf_cpu_load_file(lf);
 390         if (error)
 391                 return (error);
 392
 393         return (0);
 394 }
 395
 396 static int
 397 link_elf_load_file(linker_class_t cls, const char *filename,
 398     linker_file_t *result)
 399 {
 400         struct nameidata nd;
 401         struct thread *td = curthread;  /* XXX */
 402         Elf_Ehdr *hdr;
 403         Elf_Shdr *shdr;
 404         Elf_Sym *es;
 405         int nbytes, i, j;
 406         vm_offset_t mapbase;
 407         size_t mapsize;
 408         int error = 0;
 409         int resid, flags;
 410         elf_file_t ef;
 411         linker_file_t lf;
 412         int symtabindex;
 413         int symstrindex;
 414         int shstrindex;
 415         int nsym;
 416         int pb, rl, ra;
 417         int alignmask;
 418         int vfslocked;
 419
 420         shdr = NULL;
 421         lf = NULL;
 422         mapsize = 0;
 423         hdr = NULL;
 424
 425         NDINIT(&nd, LOOKUP, FOLLOW | MPSAFE, UIO_SYSSPACE, filename, td);
 426         flags = FREAD;
 427         error = vn_open(&nd, &flags, 0, NULL);
 428         if (error)
 429                 return error;
 430         vfslocked = NDHASGIANT(&nd);
 431         NDFREE(&nd, NDF_ONLY_PNBUF);
 432         if (nd.ni_vp->v_type != VREG) {
 433                 error = ENOEXEC;
 434                 goto out;
 435         }
 436 #ifdef MAC
 437         error = mac_check_kld_load(td->td_ucred, nd.ni_vp);
 438         if (error) {
 439                 goto out;
 440         }
 441 #endif
 442
 443         /* Read the elf header from the file. */
 444         hdr = malloc(sizeof(*hdr), M_LINKER, M_WAITOK);
 445         if (hdr == NULL) {
 446                 error = ENOMEM;
 447                 goto out;
 448         }
 449         error = vn_rdwr(UIO_READ, nd.ni_vp, (void *)hdr, sizeof(*hdr), 0,
 450             UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
 451             &resid, td);
 452         if (error)
 453                 goto out;
 454         if (resid != 0){
 455                 error = ENOEXEC;
 456                 goto out;
 457         }
 458
 459         if (!IS_ELF(*hdr)) {
 460                 error = ENOEXEC;
 461                 goto out;
 462         }
 463
 464         if (hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS
 465             || hdr->e_ident[EI_DATA] != ELF_TARG_DATA) {
 466                 link_elf_error(filename, "Unsupported file layout");
 467                 error = ENOEXEC;
 468                 goto out;
 469         }
 470         if (hdr->e_ident[EI_VERSION] != EV_CURRENT
 471             || hdr->e_version != EV_CURRENT) {
 472                 link_elf_error(filename, "Unsupported file version");
 473                 error = ENOEXEC;
 474                 goto out;
 475         }
 476         if (hdr->e_type != ET_REL) {
 477                 link_elf_error(filename, "Unsupported file type");
 478                 error = ENOEXEC;
 479                 goto out;
 480         }
 481         if (hdr->e_machine != ELF_TARG_MACH) {
 482                 link_elf_error(filename, "Unsupported machine");
 483                 error = ENOEXEC;
 484                 goto out;
 485         }
 486
 487         lf = linker_make_file(filename, &link_elf_class);
 488         if (!lf) {
 489                 error = ENOMEM;
 490                 goto out;
 491         }
 492         ef = (elf_file_t) lf;
 493         ef->nprogtab = 0;
 494         ef->e_shdr = 0;
 495         ef->nreltab = 0;
 496         ef->nrelatab = 0;
 497
 498         /* Allocate and read in the section header */
 499         nbytes = hdr->e_shnum * hdr->e_shentsize;
 500         if (nbytes == 0 || hdr->e_shoff == 0 ||
 501             hdr->e_shentsize != sizeof(Elf_Shdr)) {
 502                 error = ENOEXEC;
 503                 goto out;
 504         }
 505         shdr = malloc(nbytes, M_LINKER, M_WAITOK);
 506         if (shdr == NULL) {
 507                 error = ENOMEM;
 508                 goto out;
 509         }
 510         ef->e_shdr = shdr;
 511         error = vn_rdwr(UIO_READ, nd.ni_vp, (caddr_t)shdr, nbytes, hdr->e_shoff,
 512             UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, &resid, td);
 513         if (error)
 514                 goto out;
 515         if (resid) {
 516                 error = ENOEXEC;
 517                 goto out;
 518         }
 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_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_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_error(filename, "file has invalid symbol strings");
 559                 error = ENOEXEC;
 560                 goto out;
 561         }
 562
 563         /* Allocate space for tracking the load chunks */
 564         if (ef->nprogtab != 0)
 565                 ef->progtab = malloc(ef->nprogtab * sizeof(*ef->progtab),
 566                     M_LINKER, M_WAITOK | M_ZERO);
 567         if (ef->nreltab != 0)
 568                 ef->reltab = malloc(ef->nreltab * sizeof(*ef->reltab),
 569                     M_LINKER, M_WAITOK | M_ZERO);
 570         if (ef->nrelatab != 0)
 571                 ef->relatab = malloc(ef->nrelatab * sizeof(*ef->relatab),
 572                     M_LINKER, M_WAITOK | M_ZERO);
 573         if ((ef->nprogtab != 0 && ef->progtab == NULL) ||
 574             (ef->nreltab != 0 && ef->reltab == NULL) ||
 575             (ef->nrelatab != 0 && ef->relatab == NULL)) {
 576                 error = ENOMEM;
 577                 goto out;
 578         }
 579
 580         if (symtabindex == -1)
 581                 panic("lost symbol table index");
 582         /* Allocate space for and load the symbol table */
 583         ef->ddbsymcnt = shdr[symtabindex].sh_size / sizeof(Elf_Sym);
 584         ef->ddbsymtab = malloc(shdr[symtabindex].sh_size, M_LINKER, M_WAITOK);
 585         if (ef->ddbsymtab == NULL) {
 586                 error = ENOMEM;
 587                 goto out;
 588         }
 589         error = vn_rdwr(UIO_READ, nd.ni_vp, (void *)ef->ddbsymtab,
 590             shdr[symtabindex].sh_size, shdr[symtabindex].sh_offset,
 591             UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
 592             &resid, td);
 593         if (error)
 594                 goto out;
 595         if (resid != 0){
 596                 error = EINVAL;
 597                 goto out;
 598         }
 599
 600         if (symstrindex == -1)
 601                 panic("lost symbol string index");
 602         /* Allocate space for and load the symbol strings */
 603         ef->ddbstrcnt = shdr[symstrindex].sh_size;
 604         ef->ddbstrtab = malloc(shdr[symstrindex].sh_size, M_LINKER, M_WAITOK);
 605         if (ef->ddbstrtab == NULL) {
 606                 error = ENOMEM;
 607                 goto out;
 608         }
 609         error = vn_rdwr(UIO_READ, nd.ni_vp, ef->ddbstrtab,
 610             shdr[symstrindex].sh_size, shdr[symstrindex].sh_offset,
 611             UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
 612             &resid, td);
 613         if (error)
 614                 goto out;
 615         if (resid != 0){
 616                 error = EINVAL;
 617                 goto out;
 618         }
 619
 620         /* Do we have a string table for the section names?  */
 621         shstrindex = -1;
 622         if (hdr->e_shstrndx != 0 &&
 623             shdr[hdr->e_shstrndx].sh_type == SHT_STRTAB) {
 624                 shstrindex = hdr->e_shstrndx;
 625                 ef->shstrcnt = shdr[shstrindex].sh_size;
 626                 ef->shstrtab = malloc(shdr[shstrindex].sh_size, M_LINKER,
 627                     M_WAITOK);
 628                 if (ef->shstrtab == NULL) {
 629                         error = ENOMEM;
 630                         goto out;
 631                 }
 632                 error = vn_rdwr(UIO_READ, nd.ni_vp, ef->shstrtab,
 633                     shdr[shstrindex].sh_size, shdr[shstrindex].sh_offset,
 634                     UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
 635                     &resid, td);
 636                 if (error)
 637                         goto out;
 638                 if (resid != 0){
 639                         error = EINVAL;
 640                         goto out;
 641                 }
 642         }
 643
 644         /* Size up code/data(progbits) and bss(nobits). */
 645         alignmask = 0;
 646         for (i = 0; i < hdr->e_shnum; i++) {
 647                 switch (shdr[i].sh_type) {
 648                 case SHT_PROGBITS:
 649                 case SHT_NOBITS:
 650                         alignmask = shdr[i].sh_addralign - 1;
 651                         mapsize += alignmask;
 652                         mapsize &= ~alignmask;
 653                         mapsize += shdr[i].sh_size;
 654                         break;
 655                 }
 656         }
 657
 658         /*
 659          * We know how much space we need for the text/data/bss/etc.
 660          * This stuff needs to be in a single chunk so that profiling etc
 661          * can get the bounds and gdb can associate offsets with modules
 662          */
 663         ef->object = vm_object_allocate(OBJT_DEFAULT,
 664             round_page(mapsize) >> PAGE_SHIFT);
 665         if (ef->object == NULL) {
 666                 error = ENOMEM;
 667                 goto out;
 668         }
 669         ef->address = (caddr_t) vm_map_min(kernel_map);
 670
 671         /*
 672          * In order to satisfy amd64's architectural requirements on the
 673          * location of code and data in the kernel's address space, request a
 674          * mapping that is above the kernel.
 675          */
 676         mapbase = KERNBASE;
 677         error = vm_map_find(kernel_map, ef->object, 0, &mapbase,
 678             round_page(mapsize), TRUE, VM_PROT_ALL, VM_PROT_ALL, FALSE);
 679         if (error) {
 680                 vm_object_deallocate(ef->object);
 681                 ef->object = 0;
 682                 goto out;
 683         }
 684
 685         /* Wire the pages */
 686         error = vm_map_wire(kernel_map, mapbase,
 687             mapbase + round_page(mapsize),
 688             VM_MAP_WIRE_SYSTEM|VM_MAP_WIRE_NOHOLES);
 689         if (error != KERN_SUCCESS) {
 690                 error = ENOMEM;
 691                 goto out;
 692         }
 693
 694         /* Inform the kld system about the situation */
 695         lf->address = ef->address = (caddr_t)mapbase;
 696         lf->size = mapsize;
 697
 698         /*
 699          * Now load code/data(progbits), zero bss(nobits), allocate space for
 700          * and load relocs
 701          */
 702         pb = 0;
 703         rl = 0;
 704         ra = 0;
 705         alignmask = 0;
 706         for (i = 0; i < hdr->e_shnum; i++) {
 707                 switch (shdr[i].sh_type) {
 708                 case SHT_PROGBITS:
 709                 case SHT_NOBITS:
 710                         alignmask = shdr[i].sh_addralign - 1;
 711                         mapbase += alignmask;
 712                         mapbase &= ~alignmask;
 713                         ef->progtab[pb].addr = (void *)(uintptr_t)mapbase;
 714                         if (shdr[i].sh_type == SHT_PROGBITS) {
 715                                 ef->progtab[pb].name = "<<PROGBITS>>";
 716                                 error = vn_rdwr(UIO_READ, nd.ni_vp,
 717                                     ef->progtab[pb].addr,
 718                                     shdr[i].sh_size, shdr[i].sh_offset,
 719                                     UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred,
 720                                     NOCRED, &resid, td);
 721                                 if (error)
 722                                         goto out;
 723                                 if (resid != 0){
 724                                         error = EINVAL;
 725                                         goto out;
 726                                 }
 727                         } else {
 728                                 ef->progtab[pb].name = "<<NOBITS>>";
 729                                 bzero(ef->progtab[pb].addr, shdr[i].sh_size);
 730                         }
 731                         ef->progtab[pb].size = shdr[i].sh_size;
 732                         ef->progtab[pb].sec = i;
 733                         if (ef->shstrtab && shdr[i].sh_name != 0)
 734                                 ef->progtab[pb].name =
 735                                     ef->shstrtab + shdr[i].sh_name;
 736
 737                         /* Update all symbol values with the offset. */
 738                         for (j = 0; j < ef->ddbsymcnt; j++) {
 739                                 es = &ef->ddbsymtab[j];
 740                                 if (es->st_shndx != i)
 741                                         continue;
 742                                 es->st_value += (Elf_Addr)ef->progtab[pb].addr;
 743                         }
 744                         mapbase += shdr[i].sh_size;
 745                         pb++;
 746                         break;
 747                 case SHT_REL:
 748                         ef->reltab[rl].rel = malloc(shdr[i].sh_size, M_LINKER,
 749                             M_WAITOK);
 750                         ef->reltab[rl].nrel = shdr[i].sh_size / sizeof(Elf_Rel);
 751                         ef->reltab[rl].sec = shdr[i].sh_info;
 752                         error = vn_rdwr(UIO_READ, nd.ni_vp,
 753                             (void *)ef->reltab[rl].rel,
 754                             shdr[i].sh_size, shdr[i].sh_offset,
 755                             UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
 756                             &resid, td);
 757                         if (error)
 758                                 goto out;
 759                         if (resid != 0){
 760                                 error = EINVAL;
 761                                 goto out;
 762                         }
 763                         rl++;
 764                         break;
 765                 case SHT_RELA:
 766                         ef->relatab[ra].rela = malloc(shdr[i].sh_size, M_LINKER,
 767                             M_WAITOK);
 768                         ef->relatab[ra].nrela =
 769                             shdr[i].sh_size / sizeof(Elf_Rela);
 770                         ef->relatab[ra].sec = shdr[i].sh_info;
 771                         error = vn_rdwr(UIO_READ, nd.ni_vp,
 772                             (void *)ef->relatab[ra].rela,
 773                             shdr[i].sh_size, shdr[i].sh_offset,
 774                             UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
 775                             &resid, td);
 776                         if (error)
 777                                 goto out;
 778                         if (resid != 0){
 779                                 error = EINVAL;
 780                                 goto out;
 781                         }
 782                         ra++;
 783                         break;
 784                 }
 785         }
 786         if (pb != ef->nprogtab)
 787                 panic("lost progbits");
 788         if (rl != ef->nreltab)
 789                 panic("lost reltab");
 790         if (ra != ef->nrelatab)
 791                 panic("lost relatab");
 792         if (mapbase != (vm_offset_t)ef->address + mapsize)
 793                 panic("mapbase 0x%lx != address %p + mapsize 0x%lx (0x%lx)\n",
 794                     mapbase, ef->address, mapsize,
 795                     (vm_offset_t)ef->address + mapsize);
 796
 797         /* Local intra-module relocations */
 798         link_elf_reloc_local(lf);
 799
 800         /* Pull in dependencies */
 801         VOP_UNLOCK(nd.ni_vp, 0, td);
 802         error = linker_load_dependencies(lf);
 803         vn_lock(nd.ni_vp, LK_EXCLUSIVE | LK_RETRY, td);
 804         if (error)
 805                 goto out;
 806
 807         /* External relocations */
 808         error = relocate_file(ef);
 809         if (error)
 810                 goto out;
 811
 812         /* Notify MD code that a module is being loaded. */
 813         error = elf_cpu_load_file(lf);
 814         if (error)
 815                 goto out;
 816
 817         *result = lf;
 818
 819 out:
 820         if (error && lf)
 821                 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
 822         if (hdr)
 823                 free(hdr, M_LINKER);
 824         VOP_UNLOCK(nd.ni_vp, 0, td);
 825         vn_close(nd.ni_vp, FREAD, td->td_ucred, td);
 826         VFS_UNLOCK_GIANT(vfslocked);
 827
 828         return error;
 829 }
 830
 831 static void
 832 link_elf_unload_file(linker_file_t file)
 833 {
 834         elf_file_t ef = (elf_file_t) file;
 835         int i;
 836
 837         /* Notify MD code that a module is being unloaded. */
 838         elf_cpu_unload_file(file);
 839
 840         if (ef->preloaded) {
 841                 if (ef->reltab)
 842                         free(ef->reltab, M_LINKER);
 843                 if (ef->relatab)
 844                         free(ef->relatab, M_LINKER);
 845                 if (ef->progtab)
 846                         free(ef->progtab, M_LINKER);
 847                 if (ef->ctftab)
 848                         free(ef->ctftab, M_LINKER);
 849                 if (ef->ctfoff)
 850                         free(ef->ctfoff, M_LINKER);
 851                 if (ef->typoff)
 852                         free(ef->typoff, M_LINKER);
 853                 if (file->filename != NULL)
 854                         preload_delete_name(file->filename);
 855                 /* XXX reclaim module memory? */
 856                 return;
 857         }
 858
 859         for (i = 0; i < ef->nreltab; i++)
 860                 if (ef->reltab[i].rel)
 861                         free(ef->reltab[i].rel, M_LINKER);
 862         for (i = 0; i < ef->nrelatab; i++)
 863                 if (ef->relatab[i].rela)
 864                         free(ef->relatab[i].rela, M_LINKER);
 865         if (ef->reltab)
 866                 free(ef->reltab, M_LINKER);
 867         if (ef->relatab)
 868                 free(ef->relatab, M_LINKER);
 869         if (ef->progtab)
 870                 free(ef->progtab, M_LINKER);
 871
 872         if (ef->object) {
 873                 vm_map_remove(kernel_map, (vm_offset_t) ef->address,
 874                     (vm_offset_t) ef->address +
 875                     (ef->object->size << PAGE_SHIFT));
 876         }
 877         if (ef->e_shdr)
 878                 free(ef->e_shdr, M_LINKER);
 879         if (ef->ddbsymtab)
 880                 free(ef->ddbsymtab, M_LINKER);
 881         if (ef->ddbstrtab)
 882                 free(ef->ddbstrtab, M_LINKER);
 883         if (ef->shstrtab)
 884                 free(ef->shstrtab, M_LINKER);
 885         if (ef->ctftab)
 886                 free(ef->ctftab, M_LINKER);
 887         if (ef->ctfoff)
 888                 free(ef->ctfoff, M_LINKER);
 889         if (ef->typoff)
 890                 free(ef->typoff, M_LINKER);
 891 }
 892
 893 static const char *
 894 symbol_name(elf_file_t ef, Elf_Size r_info)
 895 {
 896         const Elf_Sym *ref;
 897
 898         if (ELF_R_SYM(r_info)) {
 899                 ref = ef->ddbsymtab + ELF_R_SYM(r_info);
 900                 return ef->ddbstrtab + ref->st_name;
 901         } else
 902                 return NULL;
 903 }
 904
 905 static Elf_Addr
 906 findbase(elf_file_t ef, int sec)
 907 {
 908         int i;
 909         Elf_Addr base = 0;
 910
 911         for (i = 0; i < ef->nprogtab; i++) {
 912                 if (sec == ef->progtab[i].sec) {
 913                         base = (Elf_Addr)ef->progtab[i].addr;
 914                         break;
 915                 }
 916         }
 917         return base;
 918 }
 919
 920 static int
 921 relocate_file(elf_file_t ef)
 922 {
 923         const Elf_Rel *rellim;
 924         const Elf_Rel *rel;
 925         const Elf_Rela *relalim;
 926         const Elf_Rela *rela;
 927         const char *symname;
 928         const Elf_Sym *sym;
 929         int i;
 930         Elf_Size symidx;
 931         Elf_Addr base;
 932
 933
 934         /* Perform relocations without addend if there are any: */
 935         for (i = 0; i < ef->nreltab; i++) {
 936                 rel = ef->reltab[i].rel;
 937                 if (rel == NULL)
 938                         panic("lost a reltab!");
 939                 rellim = rel + ef->reltab[i].nrel;
 940                 base = findbase(ef, ef->reltab[i].sec);
 941                 if (base == 0)
 942                         panic("lost base for reltab");
 943                 for ( ; rel < rellim; rel++) {
 944                         symidx = ELF_R_SYM(rel->r_info);
 945                         if (symidx >= ef->ddbsymcnt)
 946                                 continue;
 947                         sym = ef->ddbsymtab + symidx;
 948                         /* Local relocs are already done */
 949                         if (ELF_ST_BIND(sym->st_info) == STB_LOCAL)
 950                                 continue;
 951                         if (elf_reloc(&ef->lf, base, rel, ELF_RELOC_REL,
 952                             elf_obj_lookup)) {
 953                                 symname = symbol_name(ef, rel->r_info);
 954                                 printf("link_elf_obj: symbol %s undefined\n",
 955                                     symname);
 956                                 return ENOENT;
 957                         }
 958                 }
 959         }
 960
 961         /* Perform relocations with addend if there are any: */
 962         for (i = 0; i < ef->nrelatab; i++) {
 963                 rela = ef->relatab[i].rela;
 964                 if (rela == NULL)
 965                         panic("lost a relatab!");
 966                 relalim = rela + ef->relatab[i].nrela;
 967                 base = findbase(ef, ef->relatab[i].sec);
 968                 if (base == 0)
 969                         panic("lost base for relatab");
 970                 for ( ; rela < relalim; rela++) {
 971                         symidx = ELF_R_SYM(rela->r_info);
 972                         if (symidx >= ef->ddbsymcnt)
 973                                 continue;
 974                         sym = ef->ddbsymtab + symidx;
 975                         /* Local relocs are already done */
 976                         if (ELF_ST_BIND(sym->st_info) == STB_LOCAL)
 977                                 continue;
 978                         if (elf_reloc(&ef->lf, base, rela, ELF_RELOC_RELA,
 979                             elf_obj_lookup)) {
 980                                 symname = symbol_name(ef, rela->r_info);
 981                                 printf("link_elf_obj: symbol %s undefined\n",
 982                                     symname);
 983                                 return ENOENT;
 984                         }
 985                 }
 986         }
 987
 988         return 0;
 989 }
 990
 991 static int
 992 link_elf_lookup_symbol(linker_file_t lf, const char *name, c_linker_sym_t *sym)
 993 {
 994         elf_file_t ef = (elf_file_t) lf;
 995         const Elf_Sym *symp;
 996         const char *strp;
 997         int i;
 998
 999         for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) {
1000                 strp = ef->ddbstrtab + symp->st_name;
1001                 if (symp->st_shndx != SHN_UNDEF && strcmp(name, strp) == 0) {
1002                         *sym = (c_linker_sym_t) symp;
1003                         return 0;
1004                 }
1005         }
1006         return ENOENT;
1007 }
1008
1009 static int
1010 link_elf_symbol_values(linker_file_t lf, c_linker_sym_t sym,
1011     linker_symval_t *symval)
1012 {
1013         elf_file_t ef = (elf_file_t) lf;
1014         const Elf_Sym *es = (const Elf_Sym*) sym;
1015
1016         if (es >= ef->ddbsymtab && es < (ef->ddbsymtab + ef->ddbsymcnt)) {
1017                 symval->name = ef->ddbstrtab + es->st_name;
1018                 symval->value = (caddr_t)es->st_value;
1019                 symval->size = es->st_size;
1020                 return 0;
1021         }
1022         return ENOENT;
1023 }
1024
1025 static int
1026 link_elf_search_symbol(linker_file_t lf, caddr_t value,
1027     c_linker_sym_t *sym, long *diffp)
1028 {
1029         elf_file_t ef = (elf_file_t) lf;
1030         u_long off = (uintptr_t) (void *) value;
1031         u_long diff = off;
1032         u_long st_value;
1033         const Elf_Sym *es;
1034         const Elf_Sym *best = 0;
1035         int i;
1036
1037         for (i = 0, es = ef->ddbsymtab; i < ef->ddbsymcnt; i++, es++) {
1038                 if (es->st_name == 0)
1039                         continue;
1040                 st_value = es->st_value;
1041                 if (off >= st_value) {
1042                         if (off - st_value < diff) {
1043                                 diff = off - st_value;
1044                                 best = es;
1045                                 if (diff == 0)
1046                                         break;
1047                         } else if (off - st_value == diff) {
1048                                 best = es;
1049                         }
1050                 }
1051         }
1052         if (best == 0)
1053                 *diffp = off;
1054         else
1055                 *diffp = diff;
1056         *sym = (c_linker_sym_t) best;
1057
1058         return 0;
1059 }
1060
1061 /*
1062  * Look up a linker set on an ELF system.
1063  */
1064 static int
1065 link_elf_lookup_set(linker_file_t lf, const char *name,
1066     void ***startp, void ***stopp, int *countp)
1067 {
1068         elf_file_t ef = (elf_file_t)lf;
1069         void **start, **stop;
1070         int i, count;
1071
1072         /* Relative to section number */
1073         for (i = 0; i < ef->nprogtab; i++) {
1074                 if ((strncmp(ef->progtab[i].name, "set_", 4) == 0) &&
1075                     strcmp(ef->progtab[i].name + 4, name) == 0) {
1076                         start  = (void **)ef->progtab[i].addr;
1077                         stop = (void **)((char *)ef->progtab[i].addr +
1078                             ef->progtab[i].size);
1079                         count = stop - start;
1080                         if (startp)
1081                                 *startp = start;
1082                         if (stopp)
1083                                 *stopp = stop;
1084                         if (countp)
1085                                 *countp = count;
1086                         return (0);
1087                 }
1088         }
1089         return (ESRCH);
1090 }
1091
1092 static int
1093 link_elf_each_function_name(linker_file_t file,
1094     int (*callback)(const char *, void *), void *opaque)
1095 {
1096         elf_file_t ef = (elf_file_t)file;
1097         const Elf_Sym *symp;
1098         int i, error;
1099
1100         /* Exhaustive search */
1101         for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) {
1102                 if (symp->st_value != 0 &&
1103                     ELF_ST_TYPE(symp->st_info) == STT_FUNC) {
1104                         error = callback(ef->ddbstrtab + symp->st_name, opaque);
1105                         if (error)
1106                                 return (error);
1107                 }
1108         }
1109         return (0);
1110 }
1111
1112 static int
1113 link_elf_each_function_nameval(linker_file_t file,
1114     linker_function_nameval_callback_t callback, void *opaque)
1115 {
1116         linker_symval_t symval;
1117         elf_file_t ef = (elf_file_t)file;
1118         const Elf_Sym* symp;
1119         int i, error;
1120
1121         /* Exhaustive search */
1122         for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) {
1123                 if (symp->st_value != 0 &&
1124                     ELF_ST_TYPE(symp->st_info) == STT_FUNC) {
1125                         error = link_elf_symbol_values(file, (c_linker_sym_t) symp, &symval);
1126                         if (error)
1127                                 return (error);
1128                         error = callback(file, i, &symval, opaque);
1129                         if (error)
1130                                 return (error);
1131                 }
1132         }
1133         return (0);
1134 }
1135
1136 /*
1137  * Symbol lookup function that can be used when the symbol index is known (ie
1138  * in relocations). It uses the symbol index instead of doing a fully fledged
1139  * hash table based lookup when such is valid. For example for local symbols.
1140  * This is not only more efficient, it's also more correct. It's not always
1141  * the case that the symbol can be found through the hash table.
1142  */
1143 static Elf_Addr
1144 elf_obj_lookup(linker_file_t lf, Elf_Size symidx, int deps)
1145 {
1146         elf_file_t ef = (elf_file_t)lf;
1147         const Elf_Sym *sym;
1148         const char *symbol;
1149         Elf_Addr ret;
1150
1151         /* Don't even try to lookup the symbol if the index is bogus. */
1152         if (symidx >= ef->ddbsymcnt)
1153                 return (0);
1154
1155         sym = ef->ddbsymtab + symidx;
1156
1157         /* Quick answer if there is a definition included. */
1158         if (sym->st_shndx != SHN_UNDEF)
1159                 return (sym->st_value);
1160
1161         /* If we get here, then it is undefined and needs a lookup. */
1162         switch (ELF_ST_BIND(sym->st_info)) {
1163         case STB_LOCAL:
1164                 /* Local, but undefined? huh? */
1165                 return (0);
1166
1167         case STB_GLOBAL:
1168                 /* Relative to Data or Function name */
1169                 symbol = ef->ddbstrtab + sym->st_name;
1170
1171                 /* Force a lookup failure if the symbol name is bogus. */
1172                 if (*symbol == 0)
1173                         return (0);
1174                 ret = ((Elf_Addr)linker_file_lookup_symbol(lf, symbol, deps));
1175                 return ret;
1176
1177         case STB_WEAK:
1178                 printf("link_elf_obj: Weak symbols not supported\n");
1179                 return (0);
1180
1181         default:
1182                 return (0);
1183         }
1184 }
1185
1186 static void
1187 link_elf_fix_link_set(elf_file_t ef)
1188 {
1189         static const char startn[] = "__start_";
1190         static const char stopn[] = "__stop_";
1191         Elf_Sym *sym;
1192         const char *sym_name, *linkset_name;
1193         Elf_Addr startp, stopp;
1194         Elf_Size symidx;
1195         int start, i;
1196
1197         startp = stopp = 0;
1198         for (symidx = 1 /* zero entry is special */;
1199                 symidx < ef->ddbsymcnt; symidx++) {
1200                 sym = ef->ddbsymtab + symidx;
1201                 if (sym->st_shndx != SHN_UNDEF)
1202                         continue;
1203
1204                 sym_name = ef->ddbstrtab + sym->st_name;
1205                 if (strncmp(sym_name, startn, sizeof(startn) - 1) == 0) {
1206                         start = 1;
1207                         linkset_name = sym_name + sizeof(startn) - 1;
1208                 }
1209                 else if (strncmp(sym_name, stopn, sizeof(stopn) - 1) == 0) {
1210                         start = 0;
1211                         linkset_name = sym_name + sizeof(stopn) - 1;
1212                 }
1213                 else
1214                         continue;
1215
1216                 for (i = 0; i < ef->nprogtab; i++) {
1217                         if (strcmp(ef->progtab[i].name, linkset_name) == 0) {
1218                                 startp = (Elf_Addr)ef->progtab[i].addr;
1219                                 stopp = (Elf_Addr)(startp + ef->progtab[i].size);
1220                                 break;
1221                         }
1222                 }
1223                 if (i == ef->nprogtab)
1224                         continue;
1225
1226                 sym->st_value = start ? startp : stopp;
1227                 sym->st_shndx = i;
1228         }
1229 }
1230
1231 static void
1232 link_elf_reloc_local(linker_file_t lf)
1233 {
1234         elf_file_t ef = (elf_file_t)lf;
1235         const Elf_Rel *rellim;
1236         const Elf_Rel *rel;
1237         const Elf_Rela *relalim;
1238         const Elf_Rela *rela;
1239         const Elf_Sym *sym;
1240         Elf_Addr base;
1241         int i;
1242         Elf_Size symidx;
1243
1244         link_elf_fix_link_set(ef);
1245
1246         /* Perform relocations without addend if there are any: */
1247         for (i = 0; i < ef->nreltab; i++) {
1248                 rel = ef->reltab[i].rel;
1249                 if (rel == NULL)
1250                         panic("lost a reltab!");
1251                 rellim = rel + ef->reltab[i].nrel;
1252                 base = findbase(ef, ef->reltab[i].sec);
1253                 if (base == 0)
1254                         panic("lost base for reltab");
1255                 for ( ; rel < rellim; rel++) {
1256                         symidx = ELF_R_SYM(rel->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, rel, ELF_RELOC_REL,
1264                             elf_obj_lookup);
1265                 }
1266         }
1267
1268         /* Perform relocations with addend if there are any: */
1269         for (i = 0; i < ef->nrelatab; i++) {
1270                 rela = ef->relatab[i].rela;
1271                 if (rela == NULL)
1272                         panic("lost a relatab!");
1273                 relalim = rela + ef->relatab[i].nrela;
1274                 base = findbase(ef, ef->relatab[i].sec);
1275                 if (base == 0)
1276                         panic("lost base for relatab");
1277                 for ( ; rela < relalim; rela++) {
1278                         symidx = ELF_R_SYM(rela->r_info);
1279                         if (symidx >= ef->ddbsymcnt)
1280                                 continue;
1281                         sym = ef->ddbsymtab + symidx;
1282                         /* Only do local relocs */
1283                         if (ELF_ST_BIND(sym->st_info) != STB_LOCAL)
1284                                 continue;
1285                         elf_reloc_local(lf, base, rela, ELF_RELOC_RELA,
1286                             elf_obj_lookup);
1287                 }
1288         }
1289 }