sysdeps/alpha/dl-machine.h

   1 /* Machine-dependent ELF dynamic relocation inline functions.  Alpha version.
   2    Copyright (C) 1996-2001, 2002 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Richard Henderson <rth@tamu.edu>.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 /* This was written in the absence of an ABI -- don't expect
  22    it to remain unchanged.  */
  23
  24 #ifndef dl_machine_h
  25 #define dl_machine_h 1
  26
  27 #define ELF_MACHINE_NAME "alpha"
  28
  29 #include <string.h>
  30
  31
  32 /* Mask identifying addresses reserved for the user program,
  33    where the dynamic linker should not map anything.  */
  34 #define ELF_MACHINE_USER_ADDRESS_MASK   0x120000000UL
  35
  36 /* Return nonzero iff ELF header is compatible with the running host.  */
  37 static inline int
  38 elf_machine_matches_host (const Elf64_Ehdr *ehdr)
  39 {
  40   return ehdr->e_machine == EM_ALPHA;
  41 }
  42
  43 /* Return the link-time address of _DYNAMIC.  The multiple-got-capable
  44    linker no longer allocates the first .got entry for this.  But not to
  45    worry, no special tricks are needed.  */
  46 static inline Elf64_Addr
  47 elf_machine_dynamic (void)
  48 {
  49 #ifndef NO_AXP_MULTI_GOT_LD
  50   return (Elf64_Addr) &_DYNAMIC;
  51 #else
  52   register Elf64_Addr *gp __asm__ ("$29");
  53   return gp[-4096];
  54 #endif
  55 }
  56
  57 /* Return the run-time load address of the shared object.  */
  58 static inline Elf64_Addr
  59 elf_machine_load_address (void)
  60 {
  61   /* NOTE: While it is generally unfriendly to put data in the text
  62      segment, it is only slightly less so when the "data" is an
  63      instruction.  While we don't have to worry about GLD just yet, an
  64      optimizing linker might decide that our "data" is an unreachable
  65      instruction and throw it away -- with the right switches, DEC's
  66      linker will do this.  What ought to happen is we should add
  67      something to GAS to allow us access to the new GPREL_HI32/LO32
  68      relocation types stolen from OSF/1 3.0.  */
  69   /* This code relies on the fact that BRADDR relocations do not
  70      appear in dynamic relocation tables.  Not that that would be very
  71      useful anyway -- br/bsr has a 4MB range and the shared libraries
  72      are usually many many terabytes away.  */
  73
  74   Elf64_Addr dot;
  75   long int zero_disp;
  76
  77   asm("br %0, 1f\n"
  78       "0:\n\t"
  79       "br $0, 2f\n"
  80       "1:\n\t"
  81       ".section\t.data\n"
  82       "2:\n\t"
  83       ".quad 0b\n\t"
  84       ".previous"
  85       : "=r"(dot));
  86
  87   zero_disp = *(int *) dot;
  88   zero_disp = (zero_disp << 43) >> 41;
  89
  90   return dot - *(Elf64_Addr *) (dot + 4 + zero_disp);
  91 }
  92
  93 /* Set up the loaded object described by L so its unrelocated PLT
  94    entries will jump to the on-demand fixup code in dl-runtime.c.  */
  95
  96 static inline int
  97 elf_machine_runtime_setup (struct link_map *l, int lazy, int profile)
  98 {
  99   Elf64_Addr plt;
 100   extern void _dl_runtime_resolve (void);
 101   extern void _dl_runtime_profile (void);
 102
 103   if (l->l_info[DT_JMPREL] && lazy)
 104     {
 105       /* The GOT entries for the functions in the PLT have not been
 106          filled in yet.  Their initial contents are directed to the
 107          PLT which arranges for the dynamic linker to be called.  */
 108       plt = D_PTR (l, l_info[DT_PLTGOT]);
 109
 110       /* This function will be called to perform the relocation.  */
 111       if (!profile)
 112         *(Elf64_Addr *)(plt + 16) = (Elf64_Addr) &_dl_runtime_resolve;
 113       else
 114         {
 115           *(Elf64_Addr *)(plt + 16) = (Elf64_Addr) &_dl_runtime_profile;
 116
 117           if (_dl_name_match_p (GL(dl_profile), l))
 118             {
 119               /* This is the object we are looking for.  Say that we really
 120                  want profiling and the timers are started.  */
 121               GL(dl_profile_map) = l;
 122             }
 123         }
 124
 125       /* Identify this shared object */
 126       *(Elf64_Addr *)(plt + 24) = (Elf64_Addr) l;
 127
 128       /* If the first instruction of the plt entry is not
 129          "br $28, plt0", we have to reinitialize .plt for lazy relocation.  */
 130       if (*(unsigned int *)(plt + 32) != 0xc39ffff7)
 131         {
 132           unsigned int val = 0xc39ffff7;
 133           unsigned int *slot, *end;
 134           const Elf64_Rela *rela = (const Elf64_Rela *)
 135                                    D_PTR (l, l_info[DT_JMPREL]);
 136           Elf64_Addr l_addr = l->l_addr;
 137
 138           /* br t12,.+4; ldq t12,12(t12); nop; jmp t12,(t12),.+4 */
 139           *(unsigned long *)plt = 0xa77b000cc3600000;
 140           *(unsigned long *)(plt + 8) = 0x6b7b000047ff041f;
 141           slot = (unsigned int *)(plt + 32);
 142           end = (unsigned int *)(plt + 32
 143                                  + l->l_info[DT_PLTRELSZ]->d_un.d_val / 2);
 144           while (slot < end)
 145             {
 146               /* br at,.plt+0 */
 147               *slot = val;
 148               *(Elf64_Addr *) rela->r_offset = (Elf64_Addr) slot - l_addr;
 149               val -= 3;
 150               slot += 3;
 151               ++rela;
 152             }
 153         }
 154     }
 155
 156   return lazy;
 157 }
 158
 159 /* This code is used in dl-runtime.c to call the `fixup' function
 160    and then redirect to the address it returns.  */
 161 #define TRAMPOLINE_TEMPLATE(tramp_name, fixup_name, IMB)        \
 162   extern void tramp_name (void);                                \
 163   asm ( "\
 164         .globl " #tramp_name "                                  \n\
 165         .ent " #tramp_name "                                    \n\
 166 " #tramp_name ":                                                \n\
 167         lda     $sp, -44*8($sp)                                 \n\
 168         .frame  $sp, 44*8, $26                                  \n\
 169         /* Preserve all integer registers that C normally       \n\
 170            doesn't.  */                                         \n\
 171         stq     $26, 0*8($sp)                                   \n\
 172         stq     $0, 1*8($sp)                                    \n\
 173         stq     $1, 2*8($sp)                                    \n\
 174         stq     $2, 3*8($sp)                                    \n\
 175         stq     $3, 4*8($sp)                                    \n\
 176         stq     $4, 5*8($sp)                                    \n\
 177         stq     $5, 6*8($sp)                                    \n\
 178         stq     $6, 7*8($sp)                                    \n\
 179         stq     $7, 8*8($sp)                                    \n\
 180         stq     $8, 9*8($sp)                                    \n\
 181         stq     $16, 10*8($sp)                                  \n\
 182         stq     $17, 11*8($sp)                                  \n\
 183         stq     $18, 12*8($sp)                                  \n\
 184         stq     $19, 13*8($sp)                                  \n\
 185         stq     $20, 14*8($sp)                                  \n\
 186         stq     $21, 15*8($sp)                                  \n\
 187         stq     $22, 16*8($sp)                                  \n\
 188         stq     $23, 17*8($sp)                                  \n\
 189         stq     $24, 18*8($sp)                                  \n\
 190         stq     $25, 19*8($sp)                                  \n\
 191         stq     $29, 20*8($sp)                                  \n\
 192         stt     $f0, 21*8($sp)                                  \n\
 193         stt     $f1, 22*8($sp)                                  \n\
 194         stt     $f10, 23*8($sp)                                 \n\
 195         stt     $f11, 24*8($sp)                                 \n\
 196         stt     $f12, 25*8($sp)                                 \n\
 197         stt     $f13, 26*8($sp)                                 \n\
 198         stt     $f14, 27*8($sp)                                 \n\
 199         stt     $f15, 28*8($sp)                                 \n\
 200         stt     $f16, 29*8($sp)                                 \n\
 201         stt     $f17, 30*8($sp)                                 \n\
 202         stt     $f18, 31*8($sp)                                 \n\
 203         stt     $f19, 32*8($sp)                                 \n\
 204         stt     $f20, 33*8($sp)                                 \n\
 205         stt     $f21, 34*8($sp)                                 \n\
 206         stt     $f22, 35*8($sp)                                 \n\
 207         stt     $f23, 36*8($sp)                                 \n\
 208         stt     $f24, 37*8($sp)                                 \n\
 209         stt     $f25, 38*8($sp)                                 \n\
 210         stt     $f26, 39*8($sp)                                 \n\
 211         stt     $f27, 40*8($sp)                                 \n\
 212         stt     $f28, 41*8($sp)                                 \n\
 213         stt     $f29, 42*8($sp)                                 \n\
 214         stt     $f30, 43*8($sp)                                 \n\
 215         .mask   0x27ff01ff, -44*8                               \n\
 216         .fmask  0xfffffc03, -(44-21)*8                          \n\
 217         /* Set up our $gp */                                    \n\
 218         br      $gp, .+4                                        \n\
 219         ldgp    $gp, 0($gp)                                     \n\
 220         .prologue 0                                             \n\
 221         /* Set up the arguments for fixup: */                   \n\
 222         /* $16 = link_map out of plt0 */                        \n\
 223         /* $17 = offset of reloc entry = ($28 - $27 - 20) /12 * 24 */\n\
 224         /* $18 = return address */                              \n\
 225         subq    $28, $27, $17                                   \n\
 226         ldq     $16, 8($27)                                     \n\
 227         subq    $17, 20, $17                                    \n\
 228         mov     $26, $18                                        \n\
 229         addq    $17, $17, $17                                   \n\
 230         /* Do the fixup */                                      \n\
 231         bsr     $26, " ASM_ALPHA_NG_SYMBOL_PREFIX #fixup_name "..ng\n\
 232         /* Move the destination address into position.  */      \n\
 233         mov     $0, $27                                         \n\
 234         /* Restore program registers.  */                       \n\
 235         ldq     $26, 0*8($sp)                                   \n\
 236         ldq     $0, 1*8($sp)                                    \n\
 237         ldq     $1, 2*8($sp)                                    \n\
 238         ldq     $2, 3*8($sp)                                    \n\
 239         ldq     $3, 4*8($sp)                                    \n\
 240         ldq     $4, 5*8($sp)                                    \n\
 241         ldq     $5, 6*8($sp)                                    \n\
 242         ldq     $6, 7*8($sp)                                    \n\
 243         ldq     $7, 8*8($sp)                                    \n\
 244         ldq     $8, 9*8($sp)                                    \n\
 245         ldq     $16, 10*8($sp)                                  \n\
 246         ldq     $17, 11*8($sp)                                  \n\
 247         ldq     $18, 12*8($sp)                                  \n\
 248         ldq     $19, 13*8($sp)                                  \n\
 249         ldq     $20, 14*8($sp)                                  \n\
 250         ldq     $21, 15*8($sp)                                  \n\
 251         ldq     $22, 16*8($sp)                                  \n\
 252         ldq     $23, 17*8($sp)                                  \n\
 253         ldq     $24, 18*8($sp)                                  \n\
 254         ldq     $25, 19*8($sp)                                  \n\
 255         ldq     $29, 20*8($sp)                                  \n\
 256         ldt     $f0, 21*8($sp)                                  \n\
 257         ldt     $f1, 22*8($sp)                                  \n\
 258         ldt     $f10, 23*8($sp)                                 \n\
 259         ldt     $f11, 24*8($sp)                                 \n\
 260         ldt     $f12, 25*8($sp)                                 \n\
 261         ldt     $f13, 26*8($sp)                                 \n\
 262         ldt     $f14, 27*8($sp)                                 \n\
 263         ldt     $f15, 28*8($sp)                                 \n\
 264         ldt     $f16, 29*8($sp)                                 \n\
 265         ldt     $f17, 30*8($sp)                                 \n\
 266         ldt     $f18, 31*8($sp)                                 \n\
 267         ldt     $f19, 32*8($sp)                                 \n\
 268         ldt     $f20, 33*8($sp)                                 \n\
 269         ldt     $f21, 34*8($sp)                                 \n\
 270         ldt     $f22, 35*8($sp)                                 \n\
 271         ldt     $f23, 36*8($sp)                                 \n\
 272         ldt     $f24, 37*8($sp)                                 \n\
 273         ldt     $f25, 38*8($sp)                                 \n\
 274         ldt     $f26, 39*8($sp)                                 \n\
 275         ldt     $f27, 40*8($sp)                                 \n\
 276         ldt     $f28, 41*8($sp)                                 \n\
 277         ldt     $f29, 42*8($sp)                                 \n\
 278         ldt     $f30, 43*8($sp)                                 \n\
 279         /* Flush the Icache after having modified the .plt code.  */\n\
 280         " #IMB "                                                \n\
 281         /* Clean up and turn control to the destination */      \n\
 282         lda     $sp, 44*8($sp)                                  \n\
 283         jmp     $31, ($27)                                      \n\
 284         .end " #tramp_name)
 285
 286 #ifndef PROF
 287 #define ELF_MACHINE_RUNTIME_TRAMPOLINE                          \
 288   TRAMPOLINE_TEMPLATE (_dl_runtime_resolve, fixup, imb);        \
 289   TRAMPOLINE_TEMPLATE (_dl_runtime_profile, profile_fixup, /* nop */);
 290 #else
 291 #define ELF_MACHINE_RUNTIME_TRAMPOLINE                          \
 292   TRAMPOLINE_TEMPLATE (_dl_runtime_resolve, fixup, imb);        \
 293   strong_alias (_dl_runtime_resolve, _dl_runtime_profile);
 294 #endif
 295
 296 /* Initial entry point code for the dynamic linker.
 297    The C function `_dl_start' is the real entry point;
 298    its return value is the user program's entry point.  */
 299
 300 #define RTLD_START asm ("\
 301         .section .text                                          \n\
 302         .set at                                                 \n\
 303         .globl _start                                           \n\
 304         .ent _start                                             \n\
 305 _start:                                                         \n\
 306         br      $gp, 0f                                         \n\
 307 0:      ldgp    $gp, 0($gp)                                     \n\
 308         .prologue 0                                             \n\
 309         /* Pass pointer to argument block to _dl_start.  */     \n\
 310         mov     $sp, $16                                        \n\
 311         bsr     $26, "ASM_ALPHA_NG_SYMBOL_PREFIX"_dl_start..ng  \n\
 312         .end _start                                             \n\
 313         /* FALLTHRU */                                          \n\
 314         .globl _dl_start_user                                   \n\
 315         .ent _dl_start_user                                     \n\
 316 _dl_start_user:                                                 \n\
 317         .frame $30,0,$31,0                                      \n\
 318         .prologue 0                                             \n\
 319         /* Save the user entry point address in s0.  */         \n\
 320         mov     $0, $9                                          \n\
 321         /* Store the highest stack address.  */                 \n\
 322         stq     $30, __libc_stack_end                           \n\
 323         /* See if we were run as a command with the executable  \n\
 324            file name as an extra leading argument.  */          \n\
 325         ldl     $1, _dl_skip_args                               \n\
 326         bne     $1, $fixup_stack                                \n\
 327 $fixup_stack_ret:                                               \n\
 328         /* The special initializer gets called with the stack   \n\
 329            just as the application's entry point will see it;   \n\
 330            it can switch stacks if it moves these contents      \n\
 331            over.  */                                            \n\
 332 " RTLD_START_SPECIAL_INIT "                                     \n\
 333         /* Call _dl_init(_dl_loaded, argc, argv, envp) to run   \n\
 334            initializers.  */                                    \n\
 335         ldq     $16, _rtld_local                                \n\
 336         ldq     $17, 0($sp)                                     \n\
 337         lda     $18, 8($sp)                                     \n\
 338         s8addq  $17, 8, $19                                     \n\
 339         addq    $19, $18, $19                                   \n\
 340         jsr     $26, _dl_init_internal                          \n\
 341         /* Pass our finalizer function to the user in $0. */    \n\
 342         lda     $0, _dl_fini                                    \n\
 343         /* Jump to the user's entry point.  */                  \n\
 344         mov     $9, $27                                         \n\
 345         jmp     ($9)                                            \n\
 346 $fixup_stack:                                                   \n\
 347         /* Adjust the stack pointer to skip _dl_skip_args words.\n\
 348            This involves copying everything down, since the     \n\
 349            stack pointer must always be 16-byte aligned.  */    \n\
 350         ldq     $2, 0($sp)                                      \n\
 351         ldq     $5, _dl_argv                                    \n\
 352         subq    $31, $1, $6                                     \n\
 353         subq    $2, $1, $2                                      \n\
 354         s8addq  $6, $5, $5                                      \n\
 355         mov     $sp, $4                                         \n\
 356         s8addq  $1, $sp, $3                                     \n\
 357         stq     $2, 0($sp)                                      \n\
 358         stq     $5, _dl_argv                                    \n\
 359         /* Copy down argv.  */                                  \n\
 360 0:      ldq     $5, 8($3)                                       \n\
 361         addq    $4, 8, $4                                       \n\
 362         addq    $3, 8, $3                                       \n\
 363         stq     $5, 0($4)                                       \n\
 364         bne     $5, 0b                                          \n\
 365         /* Copy down envp.  */                                  \n\
 366 1:      ldq     $5, 8($3)                                       \n\
 367         addq    $4, 8, $4                                       \n\
 368         addq    $3, 8, $3                                       \n\
 369         stq     $5, 0($4)                                       \n\
 370         bne     $5, 1b                                          \n\
 371         /* Copy down auxiliary table.  */                       \n\
 372 2:      ldq     $5, 8($3)                                       \n\
 373         ldq     $6, 16($3)                                      \n\
 374         addq    $4, 16, $4                                      \n\
 375         addq    $3, 16, $3                                      \n\
 376         stq     $5, -8($4)                                      \n\
 377         stq     $6, 0($4)                                       \n\
 378         bne     $5, 2b                                          \n\
 379         br      $fixup_stack_ret                                \n\
 380         .end _dl_start_user                                     \n\
 381         .set noat                                               \n\
 382 .previous");
 383
 384 #ifndef RTLD_START_SPECIAL_INIT
 385 #define RTLD_START_SPECIAL_INIT /* nothing */
 386 #endif
 387
 388 /* ELF_RTYPE_CLASS_PLT iff TYPE describes relocation of a PLT entry, so
 389    PLT entries should not be allowed to define the value.
 390    ELF_RTYPE_CLASS_NOCOPY iff TYPE should not be allowed to resolve to one
 391    of the main executable's symbols, as for a COPY reloc, which we don't
 392    use.  */
 393 #define elf_machine_type_class(type)    \
 394   (((type) == R_ALPHA_JMP_SLOT) * ELF_RTYPE_CLASS_PLT)
 395
 396 /* A reloc type used for ld.so cmdline arg lookups to reject PLT entries.  */
 397 #define ELF_MACHINE_JMP_SLOT     R_ALPHA_JMP_SLOT
 398
 399 /* The alpha never uses Elf64_Rel relocations.  */
 400 #define ELF_MACHINE_NO_REL 1
 401
 402 /* Fix up the instructions of a PLT entry to invoke the function
 403    rather than the dynamic linker.  */
 404 static inline Elf64_Addr
 405 elf_machine_fixup_plt (struct link_map *l, lookup_t t,
 406                        const Elf64_Rela *reloc,
 407                        Elf64_Addr *got_addr, Elf64_Addr value)
 408 {
 409   const Elf64_Rela *rela_plt;
 410   Elf64_Word *plte;
 411   long int edisp;
 412
 413   /* Store the value we are going to load.  */
 414   *got_addr = value;
 415
 416   /* Recover the PLT entry address by calculating reloc's index into the
 417      .rela.plt, and finding that entry in the .plt.  */
 418   rela_plt = (void *) D_PTR (l, l_info[DT_JMPREL]);
 419   plte = (void *) (D_PTR (l, l_info[DT_PLTGOT]) + 32);
 420   plte += 3 * (reloc - rela_plt);
 421
 422   /* Find the displacement from the plt entry to the function.  */
 423   edisp = (long int) (value - (Elf64_Addr)&plte[3]) / 4;
 424
 425   if (edisp >= -0x100000 && edisp < 0x100000)
 426     {
 427       /* If we are in range, use br to perfect branch prediction and
 428          elide the dependency on the address load.  This case happens,
 429          e.g., when a shared library call is resolved to the same library.  */
 430
 431       int hi, lo;
 432       hi = value - (Elf64_Addr)&plte[0];
 433       lo = (short int) hi;
 434       hi = (hi - lo) >> 16;
 435
 436       /* Emit "lda $27,lo($27)" */
 437       plte[1] = 0x237b0000 | (lo & 0xffff);
 438
 439       /* Emit "br $31,function" */
 440       plte[2] = 0xc3e00000 | (edisp & 0x1fffff);
 441
 442       /* Think about thread-safety -- the previous instructions must be
 443          committed to memory before the first is overwritten.  */
 444       __asm__ __volatile__("wmb" : : : "memory");
 445
 446       /* Emit "ldah $27,hi($27)" */
 447       plte[0] = 0x277b0000 | (hi & 0xffff);
 448     }
 449   else
 450     {
 451       /* Don't bother with the hint since we already know the hint is
 452          wrong.  Eliding it prevents the wrong page from getting pulled
 453          into the cache.  */
 454
 455       int hi, lo;
 456       hi = (Elf64_Addr)got_addr - (Elf64_Addr)&plte[0];
 457       lo = (short)hi;
 458       hi = (hi - lo) >> 16;
 459
 460       /* Emit "ldq $27,lo($27)" */
 461       plte[1] = 0xa77b0000 | (lo & 0xffff);
 462
 463       /* Emit "jmp $31,($27)" */
 464       plte[2] = 0x6bfb0000;
 465
 466       /* Think about thread-safety -- the previous instructions must be
 467          committed to memory before the first is overwritten.  */
 468       __asm__ __volatile__("wmb" : : : "memory");
 469
 470       /* Emit "ldah $27,hi($27)" */
 471       plte[0] = 0x277b0000 | (hi & 0xffff);
 472     }
 473
 474   /* At this point, if we've been doing runtime resolution, Icache is dirty.
 475      This will be taken care of in _dl_runtime_resolve.  If instead we are
 476      doing this as part of non-lazy startup relocation, that bit of code
 477      hasn't made it into Icache yet, so there's nothing to clean up.  */
 478
 479   return value;
 480 }
 481
 482 /* Return the final value of a plt relocation.  */
 483 static inline Elf64_Addr
 484 elf_machine_plt_value (struct link_map *map, const Elf64_Rela *reloc,
 485                        Elf64_Addr value)
 486 {
 487   return value + reloc->r_addend;
 488 }
 489
 490 #endif /* !dl_machine_h */
 491
 492 #ifdef RESOLVE
 493
 494 /* Perform the relocation specified by RELOC and SYM (which is fully resolved).
 495    MAP is the object containing the reloc.  */
 496 static inline void
 497 elf_machine_rela (struct link_map *map,
 498                   const Elf64_Rela *reloc,
 499                   const Elf64_Sym *sym,
 500                   const struct r_found_version *version,
 501                   Elf64_Addr *const reloc_addr)
 502 {
 503   unsigned long int const r_type = ELF64_R_TYPE (reloc->r_info);
 504
 505 #if !defined RTLD_BOOTSTRAP && !defined HAVE_Z_COMBRELOC && !defined SHARED
 506   /* This is defined in rtld.c, but nowhere in the static libc.a; make the
 507      reference weak so static programs can still link.  This declaration
 508      cannot be done when compiling rtld.c (i.e.  #ifdef RTLD_BOOTSTRAP)
 509      because rtld.c contains the common defn for _dl_rtld_map, which is
 510      incompatible with a weak decl in the same file.  */
 511   weak_extern (_dl_rtld_map);
 512 #endif
 513
 514   /* We cannot use a switch here because we cannot locate the switch
 515      jump table until we've self-relocated.  */
 516
 517 #if !defined RTLD_BOOTSTRAP || !defined HAVE_Z_COMBRELOC
 518   if (__builtin_expect (r_type == R_ALPHA_RELATIVE, 0))
 519     {
 520 # if !defined RTLD_BOOTSTRAP && !defined HAVE_Z_COMBRELOC
 521       /* Already done in dynamic linker.  */
 522       if (map != &GL(dl_rtld_map))
 523 # endif
 524         {
 525           /* XXX Make some timings.  Maybe it's preverable to test for
 526              unaligned access and only do it the complex way if necessary.  */
 527           void *reloc_addr_1 = reloc_addr;
 528           Elf64_Addr reloc_addr_val;
 529
 530           /* Load value without causing unaligned trap. */
 531           memcpy (&reloc_addr_val, reloc_addr_1, 8);
 532           reloc_addr_val += map->l_addr;
 533
 534           /* Store value without causing unaligned trap. */
 535           memcpy (reloc_addr_1, &reloc_addr_val, 8);
 536         }
 537     }
 538 # ifndef RTLD_BOOTSTRAP
 539   else if (__builtin_expect (r_type == R_ALPHA_NONE, 0))
 540     return;
 541 # endif
 542   else
 543 #endif
 544     {
 545       Elf64_Addr loadbase, sym_value;
 546
 547       loadbase = RESOLVE (&sym, version, r_type);
 548       sym_value = sym ? loadbase + sym->st_value : 0;
 549       sym_value += reloc->r_addend;
 550
 551       if (r_type == R_ALPHA_GLOB_DAT)
 552         *reloc_addr = sym_value;
 553 #ifdef RESOLVE_CONFLICT_FIND_MAP
 554       /* In .gnu.conflict section, R_ALPHA_JMP_SLOT relocations have
 555          R_ALPHA_JMP_SLOT in lower 8 bits and the remaining 24 bits
 556          are .rela.plt index.  */
 557       else if ((r_type & 0xff) == R_ALPHA_JMP_SLOT)
 558         {
 559           /* elf_machine_fixup_plt needs the map reloc_addr points into,
 560              while in _dl_resolve_conflicts map is _dl_loaded.  */
 561           RESOLVE_CONFLICT_FIND_MAP (map, reloc_addr);
 562           reloc = ((const Elf64_Rela *) D_PTR (map, l_info[DT_JMPREL]))
 563                   + (r_type >> 8);
 564           elf_machine_fixup_plt (map, 0, reloc, reloc_addr, sym_value);
 565         }
 566 #else
 567       else if (r_type == R_ALPHA_JMP_SLOT)
 568         elf_machine_fixup_plt (map, 0, reloc, reloc_addr, sym_value);
 569 #endif
 570 #ifndef RTLD_BOOTSTRAP
 571       else if (r_type == R_ALPHA_REFQUAD)
 572         {
 573           void *reloc_addr_1 = reloc_addr;
 574
 575           /* Store value without causing unaligned trap.  */
 576           memcpy (reloc_addr_1, &sym_value, 8);
 577         }
 578 #endif
 579       else
 580         _dl_reloc_bad_type (map, r_type, 0);
 581     }
 582 }
 583
 584 /* Let do-rel.h know that on Alpha if l_addr is 0, all RELATIVE relocs
 585    can be skipped.  */
 586 #define ELF_MACHINE_REL_RELATIVE 1
 587
 588 static inline void
 589 elf_machine_rela_relative (Elf64_Addr l_addr, const Elf64_Rela *reloc,
 590                            Elf64_Addr *const reloc_addr)
 591 {
 592   /* XXX Make some timings.  Maybe it's preverable to test for
 593      unaligned access and only do it the complex way if necessary.  */
 594   void *reloc_addr_1 = reloc_addr;
 595   Elf64_Addr reloc_addr_val;
 596
 597   /* Load value without causing unaligned trap. */
 598   memcpy (&reloc_addr_val, reloc_addr_1, 8);
 599   reloc_addr_val += l_addr;
 600
 601   /* Store value without causing unaligned trap. */
 602   memcpy (reloc_addr_1, &reloc_addr_val, 8);
 603 }
 604
 605 static inline void
 606 elf_machine_lazy_rel (struct link_map *map,
 607                       Elf64_Addr l_addr, const Elf64_Rela *reloc)
 608 {
 609   Elf64_Addr * const reloc_addr = (void *)(l_addr + reloc->r_offset);
 610   unsigned long int const r_type = ELF64_R_TYPE (reloc->r_info);
 611
 612   if (r_type == R_ALPHA_JMP_SLOT)
 613     {
 614       /* Perform a RELATIVE reloc on the .got entry that transfers
 615          to the .plt.  */
 616       *reloc_addr += l_addr;
 617     }
 618   else if (r_type == R_ALPHA_NONE)
 619     return;
 620   else
 621     _dl_reloc_bad_type (map, r_type, 1);
 622 }
 623
 624 #endif /* RESOLVE */