sysdeps/i386/dl-machine.h

   1 /* Machine-dependent ELF dynamic relocation inline functions.  i386 version.
   2    Copyright (C) 1995-2002, 2003, 2004 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 #include <sysdep.h>
  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, always_inline))
  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 (GLRO(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 #define ARCH_FIXUP_ATTRIBUTE __attribute__ ((regparm (3), unused))
 158
 159 static ElfW(Addr) fixup (struct link_map *__unbounded l,
 160                          ElfW(Word) reloc_offset)
 161      ARCH_FIXUP_ATTRIBUTE;
 162 static ElfW(Addr) profile_fixup (struct link_map *l, ElfW(Word) reloc_offset,
 163                                  ElfW(Addr) retaddr)
 164      ARCH_FIXUP_ATTRIBUTE;
 165 # endif
 166
 167 /* This code is used in dl-runtime.c to call the `fixup' function
 168    and then redirect to the address it returns.  */
 169 # if !defined PROF && !__BOUNDED_POINTERS__
 170 #  define ELF_MACHINE_RUNTIME_TRAMPOLINE asm ("\
 171         .text\n\
 172         .globl _dl_runtime_resolve\n\
 173         .type _dl_runtime_resolve, @function\n\
 174         " CFI_STARTPROC "\n\
 175         .align 16\n\
 176 _dl_runtime_resolve:\n\
 177         " CFI_ADJUST_CFA_OFFSET (8) "\n\
 178         pushl %eax              # Preserve registers otherwise clobbered.\n\
 179         " CFI_ADJUST_CFA_OFFSET (4) "\n\
 180         pushl %ecx\n\
 181         " CFI_ADJUST_CFA_OFFSET (4) "\n\
 182         pushl %edx\n\
 183         " CFI_ADJUST_CFA_OFFSET (4) "\n\
 184         movl 16(%esp), %edx     # Copy args pushed by PLT in register.  Note\n\
 185         movl 12(%esp), %eax     # that `fixup' takes its parameters in regs.\n\
 186         call fixup              # Call resolver.\n\
 187         popl %edx               # Get register content back.\n\
 188         " CFI_ADJUST_CFA_OFFSET (-4) "\n\
 189         popl %ecx\n\
 190         " CFI_ADJUST_CFA_OFFSET (-4) "\n\
 191         xchgl %eax, (%esp)      # Get %eax contents end store function address.\n\
 192         ret $8                  # Jump to function address.\n\
 193         " CFI_ENDPROC "\n\
 194         .size _dl_runtime_resolve, .-_dl_runtime_resolve\n\
 195 \n\
 196         .globl _dl_runtime_profile\n\
 197         .type _dl_runtime_profile, @function\n\
 198         " CFI_STARTPROC "\n\
 199         .align 16\n\
 200 _dl_runtime_profile:\n\
 201         " CFI_ADJUST_CFA_OFFSET (8) "\n\
 202         pushl %eax              # Preserve registers otherwise clobbered.\n\
 203         " CFI_ADJUST_CFA_OFFSET (4) "\n\
 204         pushl %ecx\n\
 205         " CFI_ADJUST_CFA_OFFSET (4) "\n\
 206         pushl %edx\n\
 207         " CFI_ADJUST_CFA_OFFSET (4) "\n\
 208         movl 20(%esp), %ecx     # Load return address\n\
 209         movl 16(%esp), %edx     # Copy args pushed by PLT in register.  Note\n\
 210         movl 12(%esp), %eax     # that `fixup' takes its parameters in regs.\n\
 211         call profile_fixup      # Call resolver.\n\
 212         popl %edx               # Get register content back.\n\
 213         " CFI_ADJUST_CFA_OFFSET (-4) "\n\
 214         popl %ecx\n\
 215         " CFI_ADJUST_CFA_OFFSET (-4) "\n\
 216         xchgl %eax, (%esp)      # Get %eax contents end store function address.\n\
 217         ret $8                  # Jump to function address.\n\
 218         " CFI_ENDPROC "\n\
 219         .size _dl_runtime_profile, .-_dl_runtime_profile\n\
 220         .previous\n\
 221 ");
 222 # else
 223 #  define ELF_MACHINE_RUNTIME_TRAMPOLINE asm ("\n\
 224         .text\n\
 225         .globl _dl_runtime_resolve\n\
 226         .globl _dl_runtime_profile\n\
 227         .type _dl_runtime_resolve, @function\n\
 228         .type _dl_runtime_profile, @function\n\
 229         " CFI_STARTPROC "\n\
 230         .align 16\n\
 231 _dl_runtime_resolve:\n\
 232 _dl_runtime_profile:\n\
 233         " CFI_ADJUST_CFA_OFFSET (8) "\n\
 234         pushl %eax              # Preserve registers otherwise clobbered.\n\
 235         " CFI_ADJUST_CFA_OFFSET (4) "\n\
 236         pushl %ecx\n\
 237         " CFI_ADJUST_CFA_OFFSET (4) "\n\
 238         pushl %edx\n\
 239         " CFI_ADJUST_CFA_OFFSET (4) "\n\
 240         movl 16(%esp), %edx     # Push the arguments for `fixup'\n\
 241         movl 12(%esp), %eax\n\
 242         pushl %edx\n\
 243         " CFI_ADJUST_CFA_OFFSET (4) "\n\
 244         pushl %eax\n\
 245         " CFI_ADJUST_CFA_OFFSET (4) "\n\
 246         call fixup              # Call resolver.\n\
 247         popl %edx               # Pop the parameters\n\
 248         " CFI_ADJUST_CFA_OFFSET (-4) "\n\
 249         popl %ecx\n\
 250         " CFI_ADJUST_CFA_OFFSET (-4) "\n\
 251         popl %edx               # Get register content back.\n\
 252         " CFI_ADJUST_CFA_OFFSET (-4) "\n\
 253         popl %ecx\n\
 254         " CFI_ADJUST_CFA_OFFSET (-4) "\n\
 255         xchgl %eax, (%esp)      # Get %eax contents end store function address.\n\
 256         ret $8                  # Jump to function address.\n\
 257         " CFI_ENDPROC "\n\
 258         .size _dl_runtime_resolve, .-_dl_runtime_resolve\n\
 259         .size _dl_runtime_profile, .-_dl_runtime_profile\n\
 260         .previous\n\
 261 ");
 262 # endif
 263 #endif
 264
 265 /* Mask identifying addresses reserved for the user program,
 266    where the dynamic linker should not map anything.  */
 267 #define ELF_MACHINE_USER_ADDRESS_MASK   0xf8000000UL
 268
 269 /* Initial entry point code for the dynamic linker.
 270    The C function `_dl_start' is the real entry point;
 271    its return value is the user program's entry point.  */
 272
 273 #define RTLD_START asm ("\n\
 274         .text\n\
 275         .align 16\n\
 276 0:      movl (%esp), %ebx\n\
 277         ret\n\
 278         .align 16\n\
 279 .globl _start\n\
 280 .globl _dl_start_user\n\
 281 _start:\n\
 282         # Note that _dl_start gets the parameter in %eax.\n\
 283         movl %esp, %eax\n\
 284         call _dl_start\n\
 285 _dl_start_user:\n\
 286         # Save the user entry point address in %edi.\n\
 287         movl %eax, %edi\n\
 288         # Point %ebx at the GOT.\n\
 289         call 0b\n\
 290         addl $_GLOBAL_OFFSET_TABLE_, %ebx\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 (GLRO(dl_platform) != NULL && *GLRO(dl_platform) == '\0')
 358     /* Avoid an empty string which would disturb us.  */
 359     GLRO(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 auto inline void
 392 __attribute ((always_inline))
 393 elf_machine_rel (struct link_map *map, const Elf32_Rel *reloc,
 394                  const Elf32_Sym *sym, const struct r_found_version *version,
 395                  void *const reloc_addr_arg)
 396 {
 397   Elf32_Addr *const reloc_addr = reloc_addr_arg;
 398   const unsigned int r_type = ELF32_R_TYPE (reloc->r_info);
 399
 400 #if !defined RTLD_BOOTSTRAP || !defined HAVE_Z_COMBRELOC
 401   if (__builtin_expect (r_type == R_386_RELATIVE, 0))
 402     {
 403 # if !defined RTLD_BOOTSTRAP && !defined HAVE_Z_COMBRELOC
 404       /* This is defined in rtld.c, but nowhere in the static libc.a;
 405          make the reference weak so static programs can still link.
 406          This declaration cannot be done when compiling rtld.c
 407          (i.e. #ifdef RTLD_BOOTSTRAP) because rtld.c contains the
 408          common defn for _dl_rtld_map, which is incompatible with a
 409          weak decl in the same file.  */
 410 #  ifndef SHARED
 411       weak_extern (_dl_rtld_map);
 412 #  endif
 413       if (map != &GL(dl_rtld_map)) /* Already done in rtld itself.  */
 414 # endif
 415         *reloc_addr += map->l_addr;
 416     }
 417 # ifndef RTLD_BOOTSTRAP
 418   else if (__builtin_expect (r_type == R_386_NONE, 0))
 419     return;
 420 # endif
 421   else
 422 #endif  /* !RTLD_BOOTSTRAP and have no -z combreloc */
 423     {
 424       const Elf32_Sym *const refsym = sym;
 425 #if defined USE_TLS && !defined RTLD_BOOTSTRAP
 426       struct link_map *sym_map = RESOLVE_MAP (&sym, version, r_type);
 427       Elf32_Addr value = sym == NULL ? 0 : sym_map->l_addr + sym->st_value;
 428 #else
 429       Elf32_Addr value = RESOLVE (&sym, version, r_type);
 430
 431 # ifndef RTLD_BOOTSTRAP
 432       if (sym != NULL)
 433 # endif
 434         value += sym->st_value;
 435 #endif  /* use TLS and !RTLD_BOOTSTRAP */
 436
 437       switch (r_type)
 438         {
 439         case R_386_GLOB_DAT:
 440         case R_386_JMP_SLOT:
 441           *reloc_addr = value;
 442           break;
 443
 444 #if defined USE_TLS && (!defined RTLD_BOOTSTRAP || USE___THREAD)
 445         case R_386_TLS_DTPMOD32:
 446 # ifdef RTLD_BOOTSTRAP
 447           /* During startup the dynamic linker is always the module
 448              with index 1.
 449              XXX If this relocation is necessary move before RESOLVE
 450              call.  */
 451           *reloc_addr = 1;
 452 # else
 453           /* Get the information from the link map returned by the
 454              resolv function.  */
 455           if (sym_map != NULL)
 456             *reloc_addr = sym_map->l_tls_modid;
 457 # endif
 458           break;
 459         case R_386_TLS_DTPOFF32:
 460 # ifndef RTLD_BOOTSTRAP
 461           /* During relocation all TLS symbols are defined and used.
 462              Therefore the offset is already correct.  */
 463           if (sym != NULL)
 464             *reloc_addr = sym->st_value;
 465 # endif
 466           break;
 467         case R_386_TLS_TPOFF32:
 468           /* The offset is positive, backward from the thread pointer.  */
 469 # ifdef RTLD_BOOTSTRAP
 470           *reloc_addr += map->l_tls_offset - sym->st_value;
 471 # else
 472           /* We know the offset of object the symbol is contained in.
 473              It is a positive value which will be subtracted from the
 474              thread pointer.  To get the variable position in the TLS
 475              block we subtract the offset from that of the TLS block.  */
 476           if (sym != NULL)
 477             {
 478               CHECK_STATIC_TLS (map, sym_map);
 479               *reloc_addr += sym_map->l_tls_offset - sym->st_value;
 480             }
 481 # endif
 482           break;
 483         case R_386_TLS_TPOFF:
 484           /* The offset is negative, forward from the thread pointer.  */
 485 # ifdef RTLD_BOOTSTRAP
 486           *reloc_addr += sym->st_value - map->l_tls_offset;
 487 # else
 488           /* We know the offset of object the symbol is contained in.
 489              It is a negative value which will be added to the
 490              thread pointer.  */
 491           if (sym != NULL)
 492             {
 493               CHECK_STATIC_TLS (map, sym_map);
 494               *reloc_addr += sym->st_value - sym_map->l_tls_offset;
 495             }
 496 # endif
 497           break;
 498 #endif  /* use TLS */
 499
 500 #ifndef RTLD_BOOTSTRAP
 501         case R_386_32:
 502           *reloc_addr += value;
 503           break;
 504         case R_386_PC32:
 505           *reloc_addr += (value - (Elf32_Addr) reloc_addr);
 506           break;
 507         case R_386_COPY:
 508           if (sym == NULL)
 509             /* This can happen in trace mode if an object could not be
 510                found.  */
 511             break;
 512           if (__builtin_expect (sym->st_size > refsym->st_size, 0)
 513               || (__builtin_expect (sym->st_size < refsym->st_size, 0)
 514                   && GLRO(dl_verbose)))
 515             {
 516               const char *strtab;
 517
 518               strtab = (const char *) D_PTR (map, l_info[DT_STRTAB]);
 519               _dl_error_printf ("\
 520 %s: Symbol `%s' has different size in shared object, consider re-linking\n",
 521                                 rtld_progname ?: "<program name unknown>",
 522                                 strtab + refsym->st_name);
 523             }
 524           memcpy (reloc_addr_arg, (void *) value,
 525                   MIN (sym->st_size, refsym->st_size));
 526           break;
 527         default:
 528           _dl_reloc_bad_type (map, r_type, 0);
 529           break;
 530 #endif  /* !RTLD_BOOTSTRAP */
 531         }
 532     }
 533 }
 534
 535 #ifndef RTLD_BOOTSTRAP
 536 auto inline void
 537 __attribute__ ((always_inline))
 538 elf_machine_rela (struct link_map *map, const Elf32_Rela *reloc,
 539                   const Elf32_Sym *sym, const struct r_found_version *version,
 540                   void *const reloc_addr_arg)
 541 {
 542   Elf32_Addr *const reloc_addr = reloc_addr_arg;
 543   const unsigned int r_type = ELF32_R_TYPE (reloc->r_info);
 544
 545   if (ELF32_R_TYPE (reloc->r_info) == R_386_RELATIVE)
 546     *reloc_addr = map->l_addr + reloc->r_addend;
 547   else if (r_type != R_386_NONE)
 548     {
 549 # ifndef RESOLVE_CONFLICT_FIND_MAP
 550       const Elf32_Sym *const refsym = sym;
 551 # endif
 552 # ifdef USE_TLS
 553       struct link_map *sym_map = RESOLVE_MAP (&sym, version, r_type);
 554       Elf32_Addr value = sym == NULL ? 0 : sym_map->l_addr + sym->st_value;
 555 # else
 556       Elf32_Addr value = RESOLVE (&sym, version, r_type);
 557       if (sym != NULL)
 558         value += sym->st_value;
 559 # endif
 560
 561       switch (ELF32_R_TYPE (reloc->r_info))
 562         {
 563         case R_386_GLOB_DAT:
 564         case R_386_JMP_SLOT:
 565         case R_386_32:
 566           *reloc_addr = value + reloc->r_addend;
 567           break;
 568 # ifndef RESOLVE_CONFLICT_FIND_MAP
 569           /* Not needed for dl-conflict.c.  */
 570         case R_386_PC32:
 571           *reloc_addr = (value + reloc->r_addend - (Elf32_Addr) reloc_addr);
 572           break;
 573
 574 #  ifdef USE_TLS
 575         case R_386_TLS_DTPMOD32:
 576           /* Get the information from the link map returned by the
 577              resolv function.  */
 578           if (sym_map != NULL)
 579             *reloc_addr = sym_map->l_tls_modid;
 580           break;
 581         case R_386_TLS_DTPOFF32:
 582           /* During relocation all TLS symbols are defined and used.
 583              Therefore the offset is already correct.  */
 584           *reloc_addr = (sym == NULL ? 0 : sym->st_value) + reloc->r_addend;
 585           break;
 586         case R_386_TLS_TPOFF32:
 587           /* The offset is positive, backward from the thread pointer.  */
 588           /* We know the offset of object the symbol is contained in.
 589              It is a positive value which will be subtracted from the
 590              thread pointer.  To get the variable position in the TLS
 591              block we subtract the offset from that of the TLS block.  */
 592           if (sym != NULL)
 593             {
 594               CHECK_STATIC_TLS (map, sym_map);
 595               *reloc_addr = sym_map->l_tls_offset - sym->st_value
 596                             + reloc->r_addend;
 597             }
 598           break;
 599         case R_386_TLS_TPOFF:
 600           /* The offset is negative, forward from the thread pointer.  */
 601           /* We know the offset of object the symbol is contained in.
 602              It is a negative value which will be added to the
 603              thread pointer.  */
 604           if (sym != NULL)
 605             {
 606               CHECK_STATIC_TLS (map, sym_map);
 607               *reloc_addr = sym->st_value - sym_map->l_tls_offset
 608                             + reloc->r_addend;
 609             }
 610           break;
 611 #  endif        /* use TLS */
 612         case R_386_COPY:
 613           if (sym == NULL)
 614             /* This can happen in trace mode if an object could not be
 615                found.  */
 616             break;
 617           if (__builtin_expect (sym->st_size > refsym->st_size, 0)
 618               || (__builtin_expect (sym->st_size < refsym->st_size, 0)
 619                   && GLRO(dl_verbose)))
 620             {
 621               const char *strtab;
 622
 623               strtab = (const char *) D_PTR (map, l_info[DT_STRTAB]);
 624               _dl_error_printf ("\
 625 %s: Symbol `%s' has different size in shared object, consider re-linking\n",
 626                                 rtld_progname ?: "<program name unknown>",
 627                                 strtab + refsym->st_name);
 628             }
 629           memcpy (reloc_addr_arg, (void *) value,
 630                   MIN (sym->st_size, refsym->st_size));
 631           break;
 632 # endif /* !RESOLVE_CONFLICT_FIND_MAP */
 633         default:
 634           /* We add these checks in the version to relocate ld.so only
 635              if we are still debugging.  */
 636           _dl_reloc_bad_type (map, r_type, 0);
 637           break;
 638         }
 639     }
 640 }
 641 #endif  /* !RTLD_BOOTSTRAP */
 642
 643 auto inline void
 644 __attribute ((always_inline))
 645 elf_machine_rel_relative (Elf32_Addr l_addr, const Elf32_Rel *reloc,
 646                           void *const reloc_addr_arg)
 647 {
 648   Elf32_Addr *const reloc_addr = reloc_addr_arg;
 649   assert (ELF32_R_TYPE (reloc->r_info) == R_386_RELATIVE);
 650   *reloc_addr += l_addr;
 651 }
 652
 653 #ifndef RTLD_BOOTSTRAP
 654 auto inline void
 655 __attribute__ ((always_inline))
 656 elf_machine_rela_relative (Elf32_Addr l_addr, const Elf32_Rela *reloc,
 657                            void *const reloc_addr_arg)
 658 {
 659   Elf32_Addr *const reloc_addr = reloc_addr_arg;
 660   *reloc_addr = l_addr + reloc->r_addend;
 661 }
 662 #endif  /* !RTLD_BOOTSTRAP */
 663
 664 auto inline void
 665 __attribute__ ((always_inline))
 666 elf_machine_lazy_rel (struct link_map *map,
 667                       Elf32_Addr l_addr, const Elf32_Rel *reloc)
 668 {
 669   Elf32_Addr *const reloc_addr = (void *) (l_addr + reloc->r_offset);
 670   const unsigned int r_type = ELF32_R_TYPE (reloc->r_info);
 671   /* Check for unexpected PLT reloc type.  */
 672   if (__builtin_expect (r_type == R_386_JMP_SLOT, 1))
 673     {
 674       if (__builtin_expect (map->l_mach.plt, 0) == 0)
 675         *reloc_addr += l_addr;
 676       else
 677         *reloc_addr = (map->l_mach.plt
 678                        + (((Elf32_Addr) reloc_addr) - map->l_mach.gotplt) * 4);
 679     }
 680   else
 681     _dl_reloc_bad_type (map, r_type, 1);
 682 }
 683
 684 #ifndef RTLD_BOOTSTRAP
 685
 686 auto inline void
 687 __attribute__ ((always_inline))
 688 elf_machine_lazy_rela (struct link_map *map,
 689                        Elf32_Addr l_addr, const Elf32_Rela *reloc)
 690 {
 691 }
 692
 693 #endif  /* !RTLD_BOOTSTRAP */
 694
 695 #endif /* RESOLVE */