sysdeps/i386/dl-machine.h

   1 /* Machine-dependent ELF dynamic relocation inline functions.  i386 version.
   2    Copyright (C) 1995-2002, 2003 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #ifndef dl_machine_h
  21 #define dl_machine_h
  22
  23 #define ELF_MACHINE_NAME "i386"
  24
  25 #include <sys/param.h>
  26
  27 #include <tls.h>
  28
  29 /* Return nonzero iff ELF header is compatible with the running host.  */
  30 static inline int __attribute__ ((unused))
  31 elf_machine_matches_host (const Elf32_Ehdr *ehdr)
  32 {
  33   return ehdr->e_machine == EM_386;
  34 }
  35
  36
  37 #if defined PI_STATIC_AND_HIDDEN \
  38     && defined HAVE_VISIBILITY_ATTRIBUTE && defined HAVE_HIDDEN \
  39     && !defined HAVE_BROKEN_VISIBILITY_ATTRIBUTE
  40
  41 /* Return the link-time address of _DYNAMIC.  Conveniently, this is the
  42    first element of the GOT, a special entry that is never relocated.  */
  43 static inline Elf32_Addr __attribute__ ((unused, const))
  44 elf_machine_dynamic (void)
  45 {
  46   /* This produces a GOTOFF reloc that resolves to zero at link time, so in
  47      fact just loads from the GOT register directly.  By doing it without
  48      an asm we can let the compiler choose any register.  */
  49   extern const Elf32_Addr _GLOBAL_OFFSET_TABLE_[] attribute_hidden;
  50   return _GLOBAL_OFFSET_TABLE_[0];
  51 }
  52
  53 /* Return the run-time load address of the shared object.  */
  54 static inline Elf32_Addr __attribute__ ((unused))
  55 elf_machine_load_address (void)
  56 {
  57   /* Compute the difference between the runtime address of _DYNAMIC as seen
  58      by a GOTOFF reference, and the link-time address found in the special
  59      unrelocated first GOT entry.  */
  60   extern Elf32_Dyn bygotoff[] asm ("_DYNAMIC") attribute_hidden;
  61   return (Elf32_Addr) &bygotoff - elf_machine_dynamic ();
  62 }
  63
  64 #else  /* Without .hidden support, we can't compile the code above.  */
  65
  66 /* Return the link-time address of _DYNAMIC.  Conveniently, this is the
  67    first element of the GOT.  This must be inlined in a function which
  68    uses global data.  */
  69 static inline Elf32_Addr __attribute__ ((unused))
  70 elf_machine_dynamic (void)
  71 {
  72   register Elf32_Addr *got asm ("%ebx");
  73   return *got;
  74 }
  75
  76
  77 /* Return the run-time load address of the shared object.  */
  78 static inline Elf32_Addr __attribute__ ((unused))
  79 elf_machine_load_address (void)
  80 {
  81   /* It doesn't matter what variable this is, the reference never makes
  82      it to assembly.  We need a dummy reference to some global variable
  83      via the GOT to make sure the compiler initialized %ebx in time.  */
  84   extern int _dl_argc;
  85   Elf32_Addr addr;
  86   asm ("leal _dl_start@GOTOFF(%%ebx), %0\n"
  87        "subl _dl_start@GOT(%%ebx), %0"
  88        : "=r" (addr) : "m" (_dl_argc) : "cc");
  89   return addr;
  90 }
  91
  92 #endif
  93
  94
  95 /* Set up the loaded object described by L so its unrelocated PLT
  96    entries will jump to the on-demand fixup code in dl-runtime.c.  */
  97
  98 static inline int __attribute__ ((unused))
  99 elf_machine_runtime_setup (struct link_map *l, int lazy, int profile)
 100 {
 101   Elf32_Addr *got;
 102   extern void _dl_runtime_resolve (Elf32_Word) attribute_hidden;
 103   extern void _dl_runtime_profile (Elf32_Word) attribute_hidden;
 104
 105   if (l->l_info[DT_JMPREL] && lazy)
 106     {
 107       /* The GOT entries for functions in the PLT have not yet been filled
 108          in.  Their initial contents will arrange when called to push an
 109          offset into the .rel.plt section, push _GLOBAL_OFFSET_TABLE_[1],
 110          and then jump to _GLOBAL_OFFSET_TABLE[2].  */
 111       got = (Elf32_Addr *) D_PTR (l, l_info[DT_PLTGOT]);
 112       /* If a library is prelinked but we have to relocate anyway,
 113          we have to be able to undo the prelinking of .got.plt.
 114          The prelinker saved us here address of .plt + 0x16.  */
 115       if (got[1])
 116         {
 117           l->l_mach.plt = got[1] + l->l_addr;
 118           l->l_mach.gotplt = (Elf32_Addr) &got[3];
 119         }
 120       got[1] = (Elf32_Addr) l;  /* Identify this shared object.  */
 121
 122       /* The got[2] entry contains the address of a function which gets
 123          called to get the address of a so far unresolved function and
 124          jump to it.  The profiling extension of the dynamic linker allows
 125          to intercept the calls to collect information.  In this case we
 126          don't store the address in the GOT so that all future calls also
 127          end in this function.  */
 128       if (__builtin_expect (profile, 0))
 129         {
 130           got[2] = (Elf32_Addr) &_dl_runtime_profile;
 131
 132           if (_dl_name_match_p (GL(dl_profile), l))
 133             /* This is the object we are looking for.  Say that we really
 134                want profiling and the timers are started.  */
 135             GL(dl_profile_map) = l;
 136         }
 137       else
 138         /* This function will get called to fix up the GOT entry indicated by
 139            the offset on the stack, and then jump to the resolved address.  */
 140         got[2] = (Elf32_Addr) &_dl_runtime_resolve;
 141     }
 142
 143   return lazy;
 144 }
 145
 146 #ifdef IN_DL_RUNTIME
 147
 148 # if !defined PROF && !__BOUNDED_POINTERS__
 149 /* We add a declaration of this function here so that in dl-runtime.c
 150    the ELF_MACHINE_RUNTIME_TRAMPOLINE macro really can pass the parameters
 151    in registers.
 152
 153    We cannot use this scheme for profiling because the _mcount call
 154    destroys the passed register information.  */
 155 /* GKM FIXME: Fix trampoline to pass bounds so we can do
 156    without the `__unbounded' qualifier.  */
 157 static ElfW(Addr) fixup (struct link_map *__unbounded l, ElfW(Word) reloc_offset)
 158      __attribute__ ((regparm (2), unused));
 159 static ElfW(Addr) profile_fixup (struct link_map *l, ElfW(Word) reloc_offset,
 160                                  ElfW(Addr) retaddr)
 161      __attribute__ ((regparm (3), unused));
 162 # endif
 163
 164 /* This code is used in dl-runtime.c to call the `fixup' function
 165    and then redirect to the address it returns.  */
 166 # if !defined PROF && !__BOUNDED_POINTERS__
 167 #  define ELF_MACHINE_RUNTIME_TRAMPOLINE asm ("\
 168         .text\n\
 169         .globl _dl_runtime_resolve\n\
 170         .type _dl_runtime_resolve, @function\n\
 171         .align 16\n\
 172 _dl_runtime_resolve:\n\
 173         pushl %eax              # Preserve registers otherwise clobbered.\n\
 174         pushl %ecx\n\
 175         pushl %edx\n\
 176         movl 16(%esp), %edx     # Copy args pushed by PLT in register.  Note\n\
 177         movl 12(%esp), %eax     # that `fixup' takes its parameters in regs.\n\
 178         call fixup              # Call resolver.\n\
 179         popl %edx               # Get register content back.\n\
 180         popl %ecx\n\
 181         xchgl %eax, (%esp)      # Get %eax contents end store function address.\n\
 182         ret $8                  # Jump to function address.\n\
 183         .size _dl_runtime_resolve, .-_dl_runtime_resolve\n\
 184 \n\
 185         .globl _dl_runtime_profile\n\
 186         .type _dl_runtime_profile, @function\n\
 187         .align 16\n\
 188 _dl_runtime_profile:\n\
 189         pushl %eax              # Preserve registers otherwise clobbered.\n\
 190         pushl %ecx\n\
 191         pushl %edx\n\
 192         movl 20(%esp), %ecx     # Load return address\n\
 193         movl 16(%esp), %edx     # Copy args pushed by PLT in register.  Note\n\
 194         movl 12(%esp), %eax     # that `fixup' takes its parameters in regs.\n\
 195         call profile_fixup      # Call resolver.\n\
 196         popl %edx               # Get register content back.\n\
 197         popl %ecx\n\
 198         xchgl %eax, (%esp)      # Get %eax contents end store function address.\n\
 199         ret $8                  # Jump to function address.\n\
 200         .size _dl_runtime_profile, .-_dl_runtime_profile\n\
 201         .previous\n\
 202 ");
 203 # else
 204 #  define ELF_MACHINE_RUNTIME_TRAMPOLINE asm ("\n\
 205         .text\n\
 206         .globl _dl_runtime_resolve\n\
 207         .globl _dl_runtime_profile\n\
 208         .type _dl_runtime_resolve, @function\n\
 209         .type _dl_runtime_profile, @function\n\
 210         .align 16\n\
 211 _dl_runtime_resolve:\n\
 212 _dl_runtime_profile:\n\
 213         pushl %eax              # Preserve registers otherwise clobbered.\n\
 214         pushl %ecx\n\
 215         pushl %edx\n\
 216         movl 16(%esp), %edx     # Push the arguments for `fixup'\n\
 217         movl 12(%esp), %eax\n\
 218         pushl %edx\n\
 219         pushl %eax\n\
 220         call fixup              # Call resolver.\n\
 221         popl %edx               # Pop the parameters\n\
 222         popl %ecx\n\
 223         popl %edx               # Get register content back.\n\
 224         popl %ecx\n\
 225         xchgl %eax, (%esp)      # Get %eax contents end store function address.\n\
 226         ret $8                  # Jump to function address.\n\
 227         .size _dl_runtime_resolve, .-_dl_runtime_resolve\n\
 228         .size _dl_runtime_profile, .-_dl_runtime_profile\n\
 229         .previous\n\
 230 ");
 231 # endif
 232 #endif
 233
 234 /* Mask identifying addresses reserved for the user program,
 235    where the dynamic linker should not map anything.  */
 236 #define ELF_MACHINE_USER_ADDRESS_MASK   0xf8000000UL
 237
 238 /* Initial entry point code for the dynamic linker.
 239    The C function `_dl_start' is the real entry point;
 240    its return value is the user program's entry point.  */
 241
 242 #define RTLD_START asm ("\n\
 243         .text\n\
 244         .align 16\n\
 245 0:      movl (%esp), %ebx\n\
 246         ret\n\
 247         .align 16\n\
 248 .globl _start\n\
 249 .globl _dl_start_user\n\
 250 _start:\n\
 251         # Note that _dl_start gets the parameter in %eax.\n\
 252         movl %esp, %eax\n\
 253         call _dl_start\n\
 254 _dl_start_user:\n\
 255         # Save the user entry point address in %edi.\n\
 256         movl %eax, %edi\n\
 257         # Point %ebx at the GOT.\n\
 258         call 0b\n\
 259         addl $_GLOBAL_OFFSET_TABLE_, %ebx\n\
 260         # Store the highest stack address\n\
 261         movl __libc_stack_end@GOT(%ebx), %eax\n\
 262         movl %esp, (%eax)\n\
 263         # See if we were run as a command with the executable file\n\
 264         # name as an extra leading argument.\n\
 265         movl _dl_skip_args@GOTOFF(%ebx), %eax\n\
 266         # Pop the original argument count.\n\
 267         popl %edx\n\
 268         # Adjust the stack pointer to skip _dl_skip_args words.\n\
 269         leal (%esp,%eax,4), %esp\n\
 270         # Subtract _dl_skip_args from argc.\n\
 271         subl %eax, %edx\n\
 272         # Push argc back on the stack.\n\
 273         push %edx\n\
 274         # The special initializer gets called with the stack just\n\
 275         # as the application's entry point will see it; it can\n\
 276         # switch stacks if it moves these contents over.\n\
 277 " RTLD_START_SPECIAL_INIT "\n\
 278         # Load the parameters again.\n\
 279         # (eax, edx, ecx, *--esp) = (_dl_loaded, argc, argv, envp)\n\
 280         movl _rtld_local@GOTOFF(%ebx), %eax\n\
 281         leal 8(%esp,%edx,4), %esi\n\
 282         leal 4(%esp), %ecx\n\
 283         pushl %esi\n\
 284         # Call the function to run the initializers.\n\
 285         call _dl_init_internal@PLT\n\
 286         # Pass our finalizer function to the user in %edx, as per ELF ABI.\n\
 287         leal _dl_fini@GOTOFF(%ebx), %edx\n\
 288         # Jump to the user's entry point.\n\
 289         jmp *%edi\n\
 290         .previous\n\
 291 ");
 292
 293 #ifndef RTLD_START_SPECIAL_INIT
 294 # define RTLD_START_SPECIAL_INIT /* nothing */
 295 #endif
 296
 297 /* ELF_RTYPE_CLASS_PLT iff TYPE describes relocation of a PLT entry or
 298    TLS variable, so undefined references should not be allowed to
 299    define the value.
 300    ELF_RTYPE_CLASS_NOCOPY iff TYPE should not be allowed to resolve to one
 301    of the main executable's symbols, as for a COPY reloc.  */
 302 #if defined USE_TLS && (!defined RTLD_BOOTSTRAP || USE___THREAD)
 303 # define elf_machine_type_class(type) \
 304   ((((type) == R_386_JMP_SLOT || (type) == R_386_TLS_DTPMOD32                 \
 305      || (type) == R_386_TLS_DTPOFF32 || (type) == R_386_TLS_TPOFF32           \
 306      || (type) == R_386_TLS_TPOFF)                                            \
 307     * ELF_RTYPE_CLASS_PLT)                                                    \
 308    | (((type) == R_386_COPY) * ELF_RTYPE_CLASS_COPY))
 309 #else
 310 # define elf_machine_type_class(type) \
 311   ((((type) == R_386_JMP_SLOT) * ELF_RTYPE_CLASS_PLT)                         \
 312    | (((type) == R_386_COPY) * ELF_RTYPE_CLASS_COPY))
 313 #endif
 314
 315 /* A reloc type used for ld.so cmdline arg lookups to reject PLT entries.  */
 316 #define ELF_MACHINE_JMP_SLOT    R_386_JMP_SLOT
 317
 318 /* The i386 never uses Elf32_Rela relocations for the dynamic linker.
 319    Prelinked libraries may use Elf32_Rela though.  */
 320 #define ELF_MACHINE_PLT_REL 1
 321
 322 /* We define an initialization functions.  This is called very early in
 323    _dl_sysdep_start.  */
 324 #define DL_PLATFORM_INIT dl_platform_init ()
 325
 326 static inline void __attribute__ ((unused))
 327 dl_platform_init (void)
 328 {
 329   if (GL(dl_platform) != NULL && *GL(dl_platform) == '\0')
 330     /* Avoid an empty string which would disturb us.  */
 331     GL(dl_platform) = NULL;
 332 }
 333
 334 static inline Elf32_Addr
 335 elf_machine_fixup_plt (struct link_map *map, lookup_t t,
 336                        const Elf32_Rel *reloc,
 337                        Elf32_Addr *reloc_addr, Elf32_Addr value)
 338 {
 339   return *reloc_addr = value;
 340 }
 341
 342 /* Return the final value of a plt relocation.  */
 343 static inline Elf32_Addr
 344 elf_machine_plt_value (struct link_map *map, const Elf32_Rel *reloc,
 345                        Elf32_Addr value)
 346 {
 347   return value;
 348 }
 349
 350 #endif /* !dl_machine_h */
 351
 352 #ifdef RESOLVE
 353
 354 /* The i386 never uses Elf32_Rela relocations for the dynamic linker.
 355    Prelinked libraries may use Elf32_Rela though.  */
 356 #ifdef RTLD_BOOTSTRAP
 357 # define ELF_MACHINE_NO_RELA 1
 358 #endif
 359
 360 /* Perform the relocation specified by RELOC and SYM (which is fully resolved).
 361    MAP is the object containing the reloc.  */
 362
 363 static inline void
 364 elf_machine_rel (struct link_map *map, const Elf32_Rel *reloc,
 365                  const Elf32_Sym *sym, const struct r_found_version *version,
 366                  Elf32_Addr *const reloc_addr)
 367 {
 368   const unsigned int r_type = ELF32_R_TYPE (reloc->r_info);
 369
 370 #if !defined RTLD_BOOTSTRAP || !defined HAVE_Z_COMBRELOC
 371   if (__builtin_expect (r_type == R_386_RELATIVE, 0))
 372     {
 373 # if !defined RTLD_BOOTSTRAP && !defined HAVE_Z_COMBRELOC
 374       /* This is defined in rtld.c, but nowhere in the static libc.a;
 375          make the reference weak so static programs can still link.
 376          This declaration cannot be done when compiling rtld.c
 377          (i.e. #ifdef RTLD_BOOTSTRAP) because rtld.c contains the
 378          common defn for _dl_rtld_map, which is incompatible with a
 379          weak decl in the same file.  */
 380 #  ifndef SHARED
 381       weak_extern (_dl_rtld_map);
 382 #  endif
 383       if (map != &GL(dl_rtld_map)) /* Already done in rtld itself.  */
 384 # endif
 385         *reloc_addr += map->l_addr;
 386     }
 387 # ifndef RTLD_BOOTSTRAP
 388   else if (__builtin_expect (r_type == R_386_NONE, 0))
 389     return;
 390 # endif
 391   else
 392 #endif  /* !RTLD_BOOTSTRAP and have no -z combreloc */
 393     {
 394       const Elf32_Sym *const refsym = sym;
 395 #if defined USE_TLS && !defined RTLD_BOOTSTRAP
 396       struct link_map *sym_map = RESOLVE_MAP (&sym, version, r_type);
 397       Elf32_Addr value = sym == NULL ? 0 : sym_map->l_addr + sym->st_value;
 398 #else
 399       Elf32_Addr value = RESOLVE (&sym, version, r_type);
 400
 401 # ifndef RTLD_BOOTSTRAP
 402       if (sym != NULL)
 403 # endif
 404         value += sym->st_value;
 405 #endif  /* use TLS and !RTLD_BOOTSTRAP */
 406
 407       switch (r_type)
 408         {
 409         case R_386_GLOB_DAT:
 410         case R_386_JMP_SLOT:
 411           *reloc_addr = value;
 412           break;
 413
 414 #if defined USE_TLS && (!defined RTLD_BOOTSTRAP || USE___THREAD)
 415         case R_386_TLS_DTPMOD32:
 416 # ifdef RTLD_BOOTSTRAP
 417           /* During startup the dynamic linker is always the module
 418              with index 1.
 419              XXX If this relocation is necessary move before RESOLVE
 420              call.  */
 421           *reloc_addr = 1;
 422 # else
 423           /* Get the information from the link map returned by the
 424              resolv function.  */
 425           if (sym_map != NULL)
 426             *reloc_addr = sym_map->l_tls_modid;
 427 # endif
 428           break;
 429         case R_386_TLS_DTPOFF32:
 430 # ifndef RTLD_BOOTSTRAP
 431           /* During relocation all TLS symbols are defined and used.
 432              Therefore the offset is already correct.  */
 433           if (sym != NULL)
 434             *reloc_addr = sym->st_value;
 435 # endif
 436           break;
 437         case R_386_TLS_TPOFF32:
 438           /* The offset is positive, backward from the thread pointer.  */
 439 # ifdef RTLD_BOOTSTRAP
 440           *reloc_addr += map->l_tls_offset - sym->st_value;
 441 # else
 442           /* We know the offset of object the symbol is contained in.
 443              It is a positive value which will be subtracted from the
 444              thread pointer.  To get the variable position in the TLS
 445              block we subtract the offset from that of the TLS block.  */
 446           if (sym != NULL)
 447             {
 448               CHECK_STATIC_TLS (map, sym_map);
 449               *reloc_addr += sym_map->l_tls_offset - sym->st_value;
 450             }
 451 # endif
 452           break;
 453         case R_386_TLS_TPOFF:
 454           /* The offset is negative, forward from the thread pointer.  */
 455 # ifdef RTLD_BOOTSTRAP
 456           *reloc_addr += sym->st_value - map->l_tls_offset;
 457 # else
 458           /* We know the offset of object the symbol is contained in.
 459              It is a negative value which will be added to the
 460              thread pointer.  */
 461           if (sym != NULL)
 462             {
 463               CHECK_STATIC_TLS (map, sym_map);
 464               *reloc_addr += sym->st_value - sym_map->l_tls_offset;
 465             }
 466 # endif
 467           break;
 468 #endif  /* use TLS */
 469
 470 #ifndef RTLD_BOOTSTRAP
 471         case R_386_32:
 472           *reloc_addr += value;
 473           break;
 474         case R_386_PC32:
 475           *reloc_addr += (value - (Elf32_Addr) reloc_addr);
 476           break;
 477         case R_386_COPY:
 478           if (sym == NULL)
 479             /* This can happen in trace mode if an object could not be
 480                found.  */
 481             break;
 482           if (__builtin_expect (sym->st_size > refsym->st_size, 0)
 483               || (__builtin_expect (sym->st_size < refsym->st_size, 0)
 484                   && GL(dl_verbose)))
 485             {
 486               const char *strtab;
 487
 488               strtab = (const char *) D_PTR (map, l_info[DT_STRTAB]);
 489               _dl_error_printf ("\
 490 %s: Symbol `%s' has different size in shared object, consider re-linking\n",
 491                                 rtld_progname ?: "<program name unknown>",
 492                                 strtab + refsym->st_name);
 493             }
 494           memcpy (reloc_addr, (void *) value, MIN (sym->st_size,
 495                                                    refsym->st_size));
 496           break;
 497         default:
 498           _dl_reloc_bad_type (map, r_type, 0);
 499           break;
 500 #endif  /* !RTLD_BOOTSTRAP */
 501         }
 502     }
 503 }
 504
 505 #ifndef RTLD_BOOTSTRAP
 506 static inline void
 507 elf_machine_rela (struct link_map *map, const Elf32_Rela *reloc,
 508                   const Elf32_Sym *sym, const struct r_found_version *version,
 509                   Elf32_Addr *const reloc_addr)
 510 {
 511   const unsigned int r_type = ELF32_R_TYPE (reloc->r_info);
 512
 513   if (ELF32_R_TYPE (reloc->r_info) == R_386_RELATIVE)
 514     *reloc_addr = map->l_addr + reloc->r_addend;
 515   else if (r_type != R_386_NONE)
 516     {
 517 # ifndef RESOLVE_CONFLICT_FIND_MAP
 518       const Elf32_Sym *const refsym = sym;
 519 # endif
 520 # ifdef USE_TLS
 521       struct link_map *sym_map = RESOLVE_MAP (&sym, version, r_type);
 522       Elf32_Addr value = sym == NULL ? 0 : sym_map->l_addr + sym->st_value;
 523 # else
 524       Elf32_Addr value = RESOLVE (&sym, version, ELF32_R_TYPE (reloc->r_info));
 525       if (sym != NULL)
 526         value += sym->st_value;
 527 # endif
 528
 529       switch (ELF32_R_TYPE (reloc->r_info))
 530         {
 531         case R_386_GLOB_DAT:
 532         case R_386_JMP_SLOT:
 533         case R_386_32:
 534           *reloc_addr = value + reloc->r_addend;
 535           break;
 536         case R_386_PC32:
 537           *reloc_addr = (value + reloc->r_addend - (Elf32_Addr) reloc_addr);
 538           break;
 539
 540 # ifdef USE_TLS
 541         case R_386_TLS_DTPMOD32:
 542           /* Get the information from the link map returned by the
 543              resolv function.  */
 544           if (sym_map != NULL)
 545             *reloc_addr = sym_map->l_tls_modid;
 546           break;
 547         case R_386_TLS_DTPOFF32:
 548           /* During relocation all TLS symbols are defined and used.
 549              Therefore the offset is already correct.  */
 550           *reloc_addr = (sym == NULL ? 0 : sym->st_value) + reloc->r_addend;
 551           break;
 552         case R_386_TLS_TPOFF32:
 553           /* The offset is positive, backward from the thread pointer.  */
 554           /* We know the offset of object the symbol is contained in.
 555              It is a positive value which will be subtracted from the
 556              thread pointer.  To get the variable position in the TLS
 557              block we subtract the offset from that of the TLS block.  */
 558           CHECK_STATIC_TLS (map, sym_map);
 559           *reloc_addr
 560             = (sym == NULL ? 0 : sym_map->l_tls_offset - sym->st_value)
 561               + reloc->r_addend;
 562           break;
 563         case R_386_TLS_TPOFF:
 564           /* The offset is negative, forward from the thread pointer.  */
 565           /* We know the offset of object the symbol is contained in.
 566              It is a negative value which will be added to the
 567              thread pointer.  */
 568           CHECK_STATIC_TLS (map, sym_map);
 569           *reloc_addr
 570             = (sym == NULL ? 0 : sym->st_value - sym_map->l_tls_offset)
 571               + reloc->r_addend;
 572           break;
 573 # endif /* use TLS */
 574 # ifndef RESOLVE_CONFLICT_FIND_MAP
 575           /* Not needed for dl-conflict.c.  */
 576         case R_386_COPY:
 577           if (sym == NULL)
 578             /* This can happen in trace mode if an object could not be
 579                found.  */
 580             break;
 581           if (__builtin_expect (sym->st_size > refsym->st_size, 0)
 582               || (__builtin_expect (sym->st_size < refsym->st_size, 0)
 583                   && GL(dl_verbose)))
 584             {
 585               const char *strtab;
 586
 587               strtab = (const char *) D_PTR (map, l_info[DT_STRTAB]);
 588               _dl_error_printf ("\
 589 %s: Symbol `%s' has different size in shared object, consider re-linking\n",
 590                                 rtld_progname ?: "<program name unknown>",
 591                                 strtab + refsym->st_name);
 592             }
 593           memcpy (reloc_addr, (void *) value, MIN (sym->st_size,
 594                                                    refsym->st_size));
 595           break;
 596 # endif /* !RESOLVE_CONFLICT_FIND_MAP */
 597         default:
 598           /* We add these checks in the version to relocate ld.so only
 599              if we are still debugging.  */
 600           _dl_reloc_bad_type (map, r_type, 0);
 601           break;
 602         }
 603     }
 604 }
 605 #endif  /* !RTLD_BOOTSTRAP */
 606
 607 static inline void
 608 elf_machine_rel_relative (Elf32_Addr l_addr, const Elf32_Rel *reloc,
 609                           Elf32_Addr *const reloc_addr)
 610 {
 611   assert (ELF32_R_TYPE (reloc->r_info) == R_386_RELATIVE);
 612   *reloc_addr += l_addr;
 613 }
 614
 615 #ifndef RTLD_BOOTSTRAP
 616 static inline void
 617 elf_machine_rela_relative (Elf32_Addr l_addr, const Elf32_Rela *reloc,
 618                            Elf32_Addr *const reloc_addr)
 619 {
 620   *reloc_addr = l_addr + reloc->r_addend;
 621 }
 622 #endif  /* !RTLD_BOOTSTRAP */
 623
 624 static inline void
 625 elf_machine_lazy_rel (struct link_map *map,
 626                       Elf32_Addr l_addr, const Elf32_Rel *reloc)
 627 {
 628   Elf32_Addr *const reloc_addr = (void *) (l_addr + reloc->r_offset);
 629   const unsigned int r_type = ELF32_R_TYPE (reloc->r_info);
 630   /* Check for unexpected PLT reloc type.  */
 631   if (__builtin_expect (r_type == R_386_JMP_SLOT, 1))
 632     {
 633       if (__builtin_expect (map->l_mach.plt, 0) == 0)
 634         *reloc_addr += l_addr;
 635       else
 636         *reloc_addr = (map->l_mach.plt
 637                        + (((Elf32_Addr) reloc_addr) - map->l_mach.gotplt) * 4);
 638     }
 639   else
 640     _dl_reloc_bad_type (map, r_type, 1);
 641 }
 642
 643 #ifndef RTLD_BOOTSTRAP
 644
 645 static inline void
 646 elf_machine_lazy_rela (struct link_map *map,
 647                        Elf32_Addr l_addr, const Elf32_Rela *reloc)
 648 {
 649 }
 650
 651 #endif  /* !RTLD_BOOTSTRAP */
 652
 653 #endif /* RESOLVE */