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         " CFI_STARTPROC "\n\
 172         .align 16\n\
 173 _dl_runtime_resolve:\n\
 174         " CFI_ADJUST_CFA_OFFSET (8) "\n\
 175         pushl %eax              # Preserve registers otherwise clobbered.\n\
 176         " CFI_ADJUST_CFA_OFFSET (4) "\n\
 177         pushl %ecx\n\
 178         " CFI_ADJUST_CFA_OFFSET (4) "\n\
 179         pushl %edx\n\
 180         " CFI_ADJUST_CFA_OFFSET (4) "\n\
 181         movl 16(%esp), %edx     # Copy args pushed by PLT in register.  Note\n\
 182         movl 12(%esp), %eax     # that `fixup' takes its parameters in regs.\n\
 183         call fixup              # Call resolver.\n\
 184         popl %edx               # Get register content back.\n\
 185         " CFI_ADJUST_CFA_OFFSET (-4) "\n\
 186         popl %ecx\n\
 187         " CFI_ADJUST_CFA_OFFSET (-4) "\n\
 188         xchgl %eax, (%esp)      # Get %eax contents end store function address.\n\
 189         ret $8                  # Jump to function address.\n\
 190         " CFI_ENDPROC "\n\
 191         .size _dl_runtime_resolve, .-_dl_runtime_resolve\n\
 192 \n\
 193         .globl _dl_runtime_profile\n\
 194         .type _dl_runtime_profile, @function\n\
 195         " CFI_STARTPROC "\n\
 196         .align 16\n\
 197 _dl_runtime_profile:\n\
 198         " CFI_ADJUST_CFA_OFFSET (8) "\n\
 199         pushl %eax              # Preserve registers otherwise clobbered.\n\
 200         " CFI_ADJUST_CFA_OFFSET (4) "\n\
 201         pushl %ecx\n\
 202         " CFI_ADJUST_CFA_OFFSET (4) "\n\
 203         pushl %edx\n\
 204         " CFI_ADJUST_CFA_OFFSET (4) "\n\
 205         movl 20(%esp), %ecx     # Load return address\n\
 206         movl 16(%esp), %edx     # Copy args pushed by PLT in register.  Note\n\
 207         movl 12(%esp), %eax     # that `fixup' takes its parameters in regs.\n\
 208         call profile_fixup      # Call resolver.\n\
 209         popl %edx               # Get register content back.\n\
 210         " CFI_ADJUST_CFA_OFFSET (-4) "\n\
 211         popl %ecx\n\
 212         " CFI_ADJUST_CFA_OFFSET (-4) "\n\
 213         xchgl %eax, (%esp)      # Get %eax contents end store function address.\n\
 214         ret $8                  # Jump to function address.\n\
 215         " CFI_ENDPROC "\n\
 216         .size _dl_runtime_profile, .-_dl_runtime_profile\n\
 217         .previous\n\
 218 ");
 219 # else
 220 #  define ELF_MACHINE_RUNTIME_TRAMPOLINE asm ("\n\
 221         .text\n\
 222         .globl _dl_runtime_resolve\n\
 223         .globl _dl_runtime_profile\n\
 224         .type _dl_runtime_resolve, @function\n\
 225         .type _dl_runtime_profile, @function\n\
 226         " CFI_STARTPROC "\n\
 227         .align 16\n\
 228 _dl_runtime_resolve:\n\
 229 _dl_runtime_profile:\n\
 230         " CFI_ADJUST_CFA_OFFSET (8) "\n\
 231         pushl %eax              # Preserve registers otherwise clobbered.\n\
 232         " CFI_ADJUST_CFA_OFFSET (4) "\n\
 233         pushl %ecx\n\
 234         " CFI_ADJUST_CFA_OFFSET (4) "\n\
 235         pushl %edx\n\
 236         " CFI_ADJUST_CFA_OFFSET (4) "\n\
 237         movl 16(%esp), %edx     # Push the arguments for `fixup'\n\
 238         movl 12(%esp), %eax\n\
 239         pushl %edx\n\
 240         " CFI_ADJUST_CFA_OFFSET (4) "\n\
 241         pushl %eax\n\
 242         " CFI_ADJUST_CFA_OFFSET (4) "\n\
 243         call fixup              # Call resolver.\n\
 244         popl %edx               # Pop the parameters\n\
 245         " CFI_ADJUST_CFA_OFFSET (-4) "\n\
 246         popl %ecx\n\
 247         " CFI_ADJUST_CFA_OFFSET (-4) "\n\
 248         popl %edx               # Get register content back.\n\
 249         " CFI_ADJUST_CFA_OFFSET (-4) "\n\
 250         popl %ecx\n\
 251         " CFI_ADJUST_CFA_OFFSET (-4) "\n\
 252         xchgl %eax, (%esp)      # Get %eax contents end store function address.\n\
 253         ret $8                  # Jump to function address.\n\
 254         " CFI_ENDPROC "\n\
 255         .size _dl_runtime_resolve, .-_dl_runtime_resolve\n\
 256         .size _dl_runtime_profile, .-_dl_runtime_profile\n\
 257         .previous\n\
 258 ");
 259 # endif
 260 #endif
 261
 262 /* Mask identifying addresses reserved for the user program,
 263    where the dynamic linker should not map anything.  */
 264 #define ELF_MACHINE_USER_ADDRESS_MASK   0xf8000000UL
 265
 266 /* Initial entry point code for the dynamic linker.
 267    The C function `_dl_start' is the real entry point;
 268    its return value is the user program's entry point.  */
 269
 270 #define RTLD_START asm ("\n\
 271         .text\n\
 272         .align 16\n\
 273 0:      movl (%esp), %ebx\n\
 274         ret\n\
 275         .align 16\n\
 276 .globl _start\n\
 277 .globl _dl_start_user\n\
 278 _start:\n\
 279         # Note that _dl_start gets the parameter in %eax.\n\
 280         movl %esp, %eax\n\
 281         call _dl_start\n\
 282 _dl_start_user:\n\
 283         # Save the user entry point address in %edi.\n\
 284         movl %eax, %edi\n\
 285         # Point %ebx at the GOT.\n\
 286         call 0b\n\
 287         addl $_GLOBAL_OFFSET_TABLE_, %ebx\n\
 288         # Store the highest stack address\n\
 289         movl __libc_stack_end@GOT(%ebx), %eax\n\
 290         movl %esp, (%eax)\n\
 291         # See if we were run as a command with the executable file\n\
 292         # name as an extra leading argument.\n\
 293         movl _dl_skip_args@GOTOFF(%ebx), %eax\n\
 294         # Pop the original argument count.\n\
 295         popl %edx\n\
 296         # Adjust the stack pointer to skip _dl_skip_args words.\n\
 297         leal (%esp,%eax,4), %esp\n\
 298         # Subtract _dl_skip_args from argc.\n\
 299         subl %eax, %edx\n\
 300         # Push argc back on the stack.\n\
 301         push %edx\n\
 302         # The special initializer gets called with the stack just\n\
 303         # as the application's entry point will see it; it can\n\
 304         # switch stacks if it moves these contents over.\n\
 305 " RTLD_START_SPECIAL_INIT "\n\
 306         # Load the parameters again.\n\
 307         # (eax, edx, ecx, *--esp) = (_dl_loaded, argc, argv, envp)\n\
 308         movl _rtld_local@GOTOFF(%ebx), %eax\n\
 309         leal 8(%esp,%edx,4), %esi\n\
 310         leal 4(%esp), %ecx\n\
 311         pushl %esi\n\
 312         # Call the function to run the initializers.\n\
 313         call _dl_init_internal@PLT\n\
 314         # Pass our finalizer function to the user in %edx, as per ELF ABI.\n\
 315         leal _dl_fini@GOTOFF(%ebx), %edx\n\
 316         # Jump to the user's entry point.\n\
 317         jmp *%edi\n\
 318         .previous\n\
 319 ");
 320
 321 #ifndef RTLD_START_SPECIAL_INIT
 322 # define RTLD_START_SPECIAL_INIT /* nothing */
 323 #endif
 324
 325 /* ELF_RTYPE_CLASS_PLT iff TYPE describes relocation of a PLT entry or
 326    TLS variable, so undefined references should not be allowed to
 327    define the value.
 328    ELF_RTYPE_CLASS_NOCOPY iff TYPE should not be allowed to resolve to one
 329    of the main executable's symbols, as for a COPY reloc.  */
 330 #if defined USE_TLS && (!defined RTLD_BOOTSTRAP || USE___THREAD)
 331 # define elf_machine_type_class(type) \
 332   ((((type) == R_386_JMP_SLOT || (type) == R_386_TLS_DTPMOD32                 \
 333      || (type) == R_386_TLS_DTPOFF32 || (type) == R_386_TLS_TPOFF32           \
 334      || (type) == R_386_TLS_TPOFF)                                            \
 335     * ELF_RTYPE_CLASS_PLT)                                                    \
 336    | (((type) == R_386_COPY) * ELF_RTYPE_CLASS_COPY))
 337 #else
 338 # define elf_machine_type_class(type) \
 339   ((((type) == R_386_JMP_SLOT) * ELF_RTYPE_CLASS_PLT)                         \
 340    | (((type) == R_386_COPY) * ELF_RTYPE_CLASS_COPY))
 341 #endif
 342
 343 /* A reloc type used for ld.so cmdline arg lookups to reject PLT entries.  */
 344 #define ELF_MACHINE_JMP_SLOT    R_386_JMP_SLOT
 345
 346 /* The i386 never uses Elf32_Rela relocations for the dynamic linker.
 347    Prelinked libraries may use Elf32_Rela though.  */
 348 #define ELF_MACHINE_PLT_REL 1
 349
 350 /* We define an initialization functions.  This is called very early in
 351    _dl_sysdep_start.  */
 352 #define DL_PLATFORM_INIT dl_platform_init ()
 353
 354 static inline void __attribute__ ((unused))
 355 dl_platform_init (void)
 356 {
 357   if (GL(dl_platform) != NULL && *GL(dl_platform) == '\0')
 358     /* Avoid an empty string which would disturb us.  */
 359     GL(dl_platform) = NULL;
 360 }
 361
 362 static inline Elf32_Addr
 363 elf_machine_fixup_plt (struct link_map *map, lookup_t t,
 364                        const Elf32_Rel *reloc,
 365                        Elf32_Addr *reloc_addr, Elf32_Addr value)
 366 {
 367   return *reloc_addr = value;
 368 }
 369
 370 /* Return the final value of a plt relocation.  */
 371 static inline Elf32_Addr
 372 elf_machine_plt_value (struct link_map *map, const Elf32_Rel *reloc,
 373                        Elf32_Addr value)
 374 {
 375   return value;
 376 }
 377
 378 #endif /* !dl_machine_h */
 379
 380 #ifdef RESOLVE
 381
 382 /* The i386 never uses Elf32_Rela relocations for the dynamic linker.
 383    Prelinked libraries may use Elf32_Rela though.  */
 384 #ifdef RTLD_BOOTSTRAP
 385 # define ELF_MACHINE_NO_RELA 1
 386 #endif
 387
 388 /* Perform the relocation specified by RELOC and SYM (which is fully resolved).
 389    MAP is the object containing the reloc.  */
 390
 391 static inline void
 392 elf_machine_rel (struct link_map *map, const Elf32_Rel *reloc,
 393                  const Elf32_Sym *sym, const struct r_found_version *version,
 394                  Elf32_Addr *const reloc_addr)
 395 {
 396   const unsigned int r_type = ELF32_R_TYPE (reloc->r_info);
 397
 398 #if !defined RTLD_BOOTSTRAP || !defined HAVE_Z_COMBRELOC
 399   if (__builtin_expect (r_type == R_386_RELATIVE, 0))
 400     {
 401 # if !defined RTLD_BOOTSTRAP && !defined HAVE_Z_COMBRELOC
 402       /* This is defined in rtld.c, but nowhere in the static libc.a;
 403          make the reference weak so static programs can still link.
 404          This declaration cannot be done when compiling rtld.c
 405          (i.e. #ifdef RTLD_BOOTSTRAP) because rtld.c contains the
 406          common defn for _dl_rtld_map, which is incompatible with a
 407          weak decl in the same file.  */
 408 #  ifndef SHARED
 409       weak_extern (_dl_rtld_map);
 410 #  endif
 411       if (map != &GL(dl_rtld_map)) /* Already done in rtld itself.  */
 412 # endif
 413         *reloc_addr += map->l_addr;
 414     }
 415 # ifndef RTLD_BOOTSTRAP
 416   else if (__builtin_expect (r_type == R_386_NONE, 0))
 417     return;
 418 # endif
 419   else
 420 #endif  /* !RTLD_BOOTSTRAP and have no -z combreloc */
 421     {
 422       const Elf32_Sym *const refsym = sym;
 423 #if defined USE_TLS && !defined RTLD_BOOTSTRAP
 424       struct link_map *sym_map = RESOLVE_MAP (&sym, version, r_type);
 425       Elf32_Addr value = sym == NULL ? 0 : sym_map->l_addr + sym->st_value;
 426 #else
 427       Elf32_Addr value = RESOLVE (&sym, version, r_type);
 428
 429 # ifndef RTLD_BOOTSTRAP
 430       if (sym != NULL)
 431 # endif
 432         value += sym->st_value;
 433 #endif  /* use TLS and !RTLD_BOOTSTRAP */
 434
 435       switch (r_type)
 436         {
 437         case R_386_GLOB_DAT:
 438         case R_386_JMP_SLOT:
 439           *reloc_addr = value;
 440           break;
 441
 442 #if defined USE_TLS && (!defined RTLD_BOOTSTRAP || USE___THREAD)
 443         case R_386_TLS_DTPMOD32:
 444 # ifdef RTLD_BOOTSTRAP
 445           /* During startup the dynamic linker is always the module
 446              with index 1.
 447              XXX If this relocation is necessary move before RESOLVE
 448              call.  */
 449           *reloc_addr = 1;
 450 # else
 451           /* Get the information from the link map returned by the
 452              resolv function.  */
 453           if (sym_map != NULL)
 454             *reloc_addr = sym_map->l_tls_modid;
 455 # endif
 456           break;
 457         case R_386_TLS_DTPOFF32:
 458 # ifndef RTLD_BOOTSTRAP
 459           /* During relocation all TLS symbols are defined and used.
 460              Therefore the offset is already correct.  */
 461           if (sym != NULL)
 462             *reloc_addr = sym->st_value;
 463 # endif
 464           break;
 465         case R_386_TLS_TPOFF32:
 466           /* The offset is positive, backward from the thread pointer.  */
 467 # ifdef RTLD_BOOTSTRAP
 468           *reloc_addr += map->l_tls_offset - sym->st_value;
 469 # else
 470           /* We know the offset of object the symbol is contained in.
 471              It is a positive value which will be subtracted from the
 472              thread pointer.  To get the variable position in the TLS
 473              block we subtract the offset from that of the TLS block.  */
 474           if (sym != NULL)
 475             {
 476               CHECK_STATIC_TLS (map, sym_map);
 477               *reloc_addr += sym_map->l_tls_offset - sym->st_value;
 478             }
 479 # endif
 480           break;
 481         case R_386_TLS_TPOFF:
 482           /* The offset is negative, forward from the thread pointer.  */
 483 # ifdef RTLD_BOOTSTRAP
 484           *reloc_addr += sym->st_value - map->l_tls_offset;
 485 # else
 486           /* We know the offset of object the symbol is contained in.
 487              It is a negative value which will be added to the
 488              thread pointer.  */
 489           if (sym != NULL)
 490             {
 491               CHECK_STATIC_TLS (map, sym_map);
 492               *reloc_addr += sym->st_value - sym_map->l_tls_offset;
 493             }
 494 # endif
 495           break;
 496 #endif  /* use TLS */
 497
 498 #ifndef RTLD_BOOTSTRAP
 499         case R_386_32:
 500           *reloc_addr += value;
 501           break;
 502         case R_386_PC32:
 503           *reloc_addr += (value - (Elf32_Addr) reloc_addr);
 504           break;
 505         case R_386_COPY:
 506           if (sym == NULL)
 507             /* This can happen in trace mode if an object could not be
 508                found.  */
 509             break;
 510           if (__builtin_expect (sym->st_size > refsym->st_size, 0)
 511               || (__builtin_expect (sym->st_size < refsym->st_size, 0)
 512                   && GL(dl_verbose)))
 513             {
 514               const char *strtab;
 515
 516               strtab = (const char *) D_PTR (map, l_info[DT_STRTAB]);
 517               _dl_error_printf ("\
 518 %s: Symbol `%s' has different size in shared object, consider re-linking\n",
 519                                 rtld_progname ?: "<program name unknown>",
 520                                 strtab + refsym->st_name);
 521             }
 522           memcpy (reloc_addr, (void *) value, MIN (sym->st_size,
 523                                                    refsym->st_size));
 524           break;
 525         default:
 526           _dl_reloc_bad_type (map, r_type, 0);
 527           break;
 528 #endif  /* !RTLD_BOOTSTRAP */
 529         }
 530     }
 531 }
 532
 533 #ifndef RTLD_BOOTSTRAP
 534 static inline void
 535 elf_machine_rela (struct link_map *map, const Elf32_Rela *reloc,
 536                   const Elf32_Sym *sym, const struct r_found_version *version,
 537                   Elf32_Addr *const reloc_addr)
 538 {
 539   const unsigned int r_type = ELF32_R_TYPE (reloc->r_info);
 540
 541   if (ELF32_R_TYPE (reloc->r_info) == R_386_RELATIVE)
 542     *reloc_addr = map->l_addr + reloc->r_addend;
 543   else if (r_type != R_386_NONE)
 544     {
 545 # ifndef RESOLVE_CONFLICT_FIND_MAP
 546       const Elf32_Sym *const refsym = sym;
 547 # endif
 548 # ifdef USE_TLS
 549       struct link_map *sym_map = RESOLVE_MAP (&sym, version, r_type);
 550       Elf32_Addr value = sym == NULL ? 0 : sym_map->l_addr + sym->st_value;
 551 # else
 552       Elf32_Addr value = RESOLVE (&sym, version, r_type);
 553       if (sym != NULL)
 554         value += sym->st_value;
 555 # endif
 556
 557       switch (ELF32_R_TYPE (reloc->r_info))
 558         {
 559         case R_386_GLOB_DAT:
 560         case R_386_JMP_SLOT:
 561         case R_386_32:
 562           *reloc_addr = value + reloc->r_addend;
 563           break;
 564 # ifndef RESOLVE_CONFLICT_FIND_MAP
 565           /* Not needed for dl-conflict.c.  */
 566         case R_386_PC32:
 567           *reloc_addr = (value + reloc->r_addend - (Elf32_Addr) reloc_addr);
 568           break;
 569
 570 #  ifdef USE_TLS
 571         case R_386_TLS_DTPMOD32:
 572           /* Get the information from the link map returned by the
 573              resolv function.  */
 574           if (sym_map != NULL)
 575             *reloc_addr = sym_map->l_tls_modid;
 576           break;
 577         case R_386_TLS_DTPOFF32:
 578           /* During relocation all TLS symbols are defined and used.
 579              Therefore the offset is already correct.  */
 580           *reloc_addr = (sym == NULL ? 0 : sym->st_value) + reloc->r_addend;
 581           break;
 582         case R_386_TLS_TPOFF32:
 583           /* The offset is positive, backward from the thread pointer.  */
 584           /* We know the offset of object the symbol is contained in.
 585              It is a positive value which will be subtracted from the
 586              thread pointer.  To get the variable position in the TLS
 587              block we subtract the offset from that of the TLS block.  */
 588           CHECK_STATIC_TLS (map, sym_map);
 589           *reloc_addr
 590             = (sym == NULL ? 0 : sym_map->l_tls_offset - sym->st_value)
 591               + reloc->r_addend;
 592           break;
 593         case R_386_TLS_TPOFF:
 594           /* The offset is negative, forward from the thread pointer.  */
 595           /* We know the offset of object the symbol is contained in.
 596              It is a negative value which will be added to the
 597              thread pointer.  */
 598           CHECK_STATIC_TLS (map, sym_map);
 599           *reloc_addr
 600             = (sym == NULL ? 0 : sym->st_value - sym_map->l_tls_offset)
 601               + reloc->r_addend;
 602           break;
 603 #  endif        /* use TLS */
 604         case R_386_COPY:
 605           if (sym == NULL)
 606             /* This can happen in trace mode if an object could not be
 607                found.  */
 608             break;
 609           if (__builtin_expect (sym->st_size > refsym->st_size, 0)
 610               || (__builtin_expect (sym->st_size < refsym->st_size, 0)
 611                   && GL(dl_verbose)))
 612             {
 613               const char *strtab;
 614
 615               strtab = (const char *) D_PTR (map, l_info[DT_STRTAB]);
 616               _dl_error_printf ("\
 617 %s: Symbol `%s' has different size in shared object, consider re-linking\n",
 618                                 rtld_progname ?: "<program name unknown>",
 619                                 strtab + refsym->st_name);
 620             }
 621           memcpy (reloc_addr, (void *) value, MIN (sym->st_size,
 622                                                    refsym->st_size));
 623           break;
 624 # endif /* !RESOLVE_CONFLICT_FIND_MAP */
 625         default:
 626           /* We add these checks in the version to relocate ld.so only
 627              if we are still debugging.  */
 628           _dl_reloc_bad_type (map, r_type, 0);
 629           break;
 630         }
 631     }
 632 }
 633 #endif  /* !RTLD_BOOTSTRAP */
 634
 635 static inline void
 636 elf_machine_rel_relative (Elf32_Addr l_addr, const Elf32_Rel *reloc,
 637                           Elf32_Addr *const reloc_addr)
 638 {
 639   assert (ELF32_R_TYPE (reloc->r_info) == R_386_RELATIVE);
 640   *reloc_addr += l_addr;
 641 }
 642
 643 #ifndef RTLD_BOOTSTRAP
 644 static inline void
 645 elf_machine_rela_relative (Elf32_Addr l_addr, const Elf32_Rela *reloc,
 646                            Elf32_Addr *const reloc_addr)
 647 {
 648   *reloc_addr = l_addr + reloc->r_addend;
 649 }
 650 #endif  /* !RTLD_BOOTSTRAP */
 651
 652 static inline void
 653 elf_machine_lazy_rel (struct link_map *map,
 654                       Elf32_Addr l_addr, const Elf32_Rel *reloc)
 655 {
 656   Elf32_Addr *const reloc_addr = (void *) (l_addr + reloc->r_offset);
 657   const unsigned int r_type = ELF32_R_TYPE (reloc->r_info);
 658   /* Check for unexpected PLT reloc type.  */
 659   if (__builtin_expect (r_type == R_386_JMP_SLOT, 1))
 660     {
 661       if (__builtin_expect (map->l_mach.plt, 0) == 0)
 662         *reloc_addr += l_addr;
 663       else
 664         *reloc_addr = (map->l_mach.plt
 665                        + (((Elf32_Addr) reloc_addr) - map->l_mach.gotplt) * 4);
 666     }
 667   else
 668     _dl_reloc_bad_type (map, r_type, 1);
 669 }
 670
 671 #ifndef RTLD_BOOTSTRAP
 672
 673 static inline void
 674 elf_machine_lazy_rela (struct link_map *map,
 675                        Elf32_Addr l_addr, const Elf32_Rela *reloc)
 676 {
 677 }
 678
 679 #endif  /* !RTLD_BOOTSTRAP */
 680
 681 #endif /* RESOLVE */