sysdeps/hppa/dl-machine.h

   1 /* Machine-dependent ELF dynamic relocation inline functions.  PA-RISC version.
   2    Copyright (C) 1995-2017 Free Software Foundation, Inc.
   3    Contributed by David Huggins-Daines <dhd@debian.org>
   4    This file is part of the GNU C Library.
   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, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef dl_machine_h
  21 #define dl_machine_h 1
  22
  23 #define ELF_MACHINE_NAME "hppa"
  24
  25 #include <sys/param.h>
  26 #include <assert.h>
  27 #include <string.h>
  28 #include <link.h>
  29 #include <errno.h>
  30 #include <dl-fptr.h>
  31 #include <abort-instr.h>
  32 #include <tls.h>
  33
  34 /* These two definitions must match the definition of the stub in
  35    bfd/elf32-hppa.c (see plt_stub[]).
  36
  37    a. Define the size of the *entire* stub we place at the end of the PLT
  38    table (right up against the GOT).
  39
  40    b. Define the number of bytes back from the GOT to the entry point of
  41    the PLT stub. You see the PLT stub must be entered in the middle
  42    so it can depwi to find it's own address (long jump stub)
  43
  44    c. Define the size of a single PLT entry so we can jump over the
  45    last entry to get the stub address */
  46
  47 #define SIZEOF_PLT_STUB (7*4)
  48 #define GOT_FROM_PLT_STUB (4*4)
  49 #define PLT_ENTRY_SIZE (2*4)
  50
  51 /* Initialize the function descriptor table before relocations */
  52 static inline void
  53 __hppa_init_bootstrap_fdesc_table (struct link_map *map)
  54 {
  55   ElfW(Addr) *boot_table;
  56
  57   /* Careful: this will be called before got has been relocated... */
  58   ELF_MACHINE_LOAD_ADDRESS(boot_table,_dl_boot_fptr_table);
  59
  60   map->l_mach.fptr_table_len = ELF_MACHINE_BOOT_FPTR_TABLE_LEN;
  61   map->l_mach.fptr_table = boot_table;
  62 }
  63
  64 #define ELF_MACHINE_BEFORE_RTLD_RELOC(dynamic_info)             \
  65         __hppa_init_bootstrap_fdesc_table (&bootstrap_map);     \
  66         _dl_fptr_init();
  67
  68 /* Return nonzero iff ELF header is compatible with the running host.  */
  69 static inline int
  70 elf_machine_matches_host (const Elf32_Ehdr *ehdr)
  71 {
  72   return ehdr->e_machine == EM_PARISC;
  73 }
  74
  75 /* Return the link-time address of _DYNAMIC.  */
  76 static inline Elf32_Addr
  77 elf_machine_dynamic (void) __attribute__ ((const));
  78
  79 static inline Elf32_Addr
  80 elf_machine_dynamic (void)
  81 {
  82   Elf32_Addr dynamic;
  83
  84   asm ("b,l     1f,%0\n"
  85 "       depi    0,31,2,%0\n"
  86 "1:     addil   L'_GLOBAL_OFFSET_TABLE_ - ($PIC_pcrel$0 - 8),%0\n"
  87 "       ldw     R'_GLOBAL_OFFSET_TABLE_ - ($PIC_pcrel$0 - 12)(%%r1),%0\n"
  88        : "=r" (dynamic) : : "r1");
  89
  90   return dynamic;
  91 }
  92
  93 /* Return the run-time load address of the shared object.  */
  94 static inline Elf32_Addr
  95 elf_machine_load_address (void) __attribute__ ((const));
  96
  97 static inline Elf32_Addr
  98 elf_machine_load_address (void)
  99 {
 100   Elf32_Addr dynamic;
 101
 102   asm (
 103 "       b,l     1f,%0\n"
 104 "       depi    0,31,2,%0\n"
 105 "1:     addil   L'_DYNAMIC - ($PIC_pcrel$0 - 8),%0\n"
 106 "       ldo     R'_DYNAMIC - ($PIC_pcrel$0 - 12)(%%r1),%0\n"
 107    : "=r" (dynamic) : : "r1");
 108
 109   return dynamic - elf_machine_dynamic ();
 110 }
 111
 112 /* Fixup a PLT entry to bounce directly to the function at VALUE. */
 113 static inline struct fdesc __attribute__ ((always_inline))
 114 elf_machine_fixup_plt (struct link_map *map, lookup_t t,
 115                        const Elf32_Rela *reloc,
 116                        Elf32_Addr *reloc_addr, struct fdesc value)
 117 {
 118   volatile Elf32_Addr *rfdesc = reloc_addr;
 119   /* map is the link_map for the caller, t is the link_map for the object
 120      being called */
 121   rfdesc[1] = value.gp;
 122   /* Need to ensure that the gp is visible before the code
 123      entry point is updated */
 124   rfdesc[0] = value.ip;
 125   return value;
 126 }
 127
 128 /* Return the final value of a plt relocation.  */
 129 static inline struct fdesc
 130 elf_machine_plt_value (struct link_map *map, const Elf32_Rela *reloc,
 131                        struct fdesc value)
 132 {
 133   /* We are rela only, return a function descriptor as a plt entry. */
 134   return (struct fdesc) { value.ip + reloc->r_addend, value.gp };
 135 }
 136
 137 /* Set up the loaded object described by L so its unrelocated PLT
 138    entries will jump to the on-demand fixup code in dl-runtime.c.  */
 139
 140 static inline int
 141 elf_machine_runtime_setup (struct link_map *l, int lazy, int profile)
 142 {
 143   Elf32_Addr *got = NULL;
 144   Elf32_Addr l_addr, iplt, jmprel, end_jmprel, r_type, r_sym;
 145   const Elf32_Rela *reloc;
 146   struct fdesc *fptr;
 147   static union {
 148     unsigned char c[8];
 149     Elf32_Addr i[2];
 150   } sig = {{0x00,0xc0,0xff,0xee, 0xde,0xad,0xbe,0xef}};
 151
 152   /* If we don't have a PLT we can just skip all this... */
 153   if (__builtin_expect (l->l_info[DT_JMPREL] == NULL,0))
 154     return lazy;
 155
 156   /* All paths use these values */
 157   l_addr = l->l_addr;
 158   jmprel = D_PTR(l, l_info[DT_JMPREL]);
 159   end_jmprel = jmprel + l->l_info[DT_PLTRELSZ]->d_un.d_val;
 160
 161   extern void _dl_runtime_resolve (void);
 162   extern void _dl_runtime_profile (void);
 163
 164   /* Linking lazily */
 165   if (lazy)
 166     {
 167       /* FIXME: Search for the got, but backwards through the relocs, technically we should
 168          find it on the first try. However, assuming the relocs got out of order the
 169          routine is made a bit more robust by searching them all in case of failure. */
 170       for (iplt = (end_jmprel - sizeof(Elf32_Rela)); iplt >= jmprel; iplt -= sizeof (Elf32_Rela))
 171         {
 172
 173           reloc = (const Elf32_Rela *) iplt;
 174           r_type = ELF32_R_TYPE (reloc->r_info);
 175           r_sym = ELF32_R_SYM (reloc->r_info);
 176
 177           got = (Elf32_Addr *) (reloc->r_offset + l_addr + PLT_ENTRY_SIZE + SIZEOF_PLT_STUB);
 178
 179           /* If we aren't an IPLT, and we aren't NONE then it's a bad reloc */
 180           if (__builtin_expect (r_type != R_PARISC_IPLT, 0))
 181             {
 182               if (__builtin_expect (r_type != R_PARISC_NONE, 0))
 183                 _dl_reloc_bad_type (l, r_type, 1);
 184               continue;
 185             }
 186
 187           /* Check for the plt_stub that binutils placed here for us
 188              to use with _dl_runtime_resolve  */
 189           if (got[-2] != sig.i[0] || got[-1] != sig.i[1])
 190             {
 191               got = NULL; /* Not the stub... keep looking */
 192             }
 193           else
 194             {
 195               /* Found the GOT! */
 196               register Elf32_Addr ltp __asm__ ("%r19");
 197
 198               /* Identify this shared object. Second entry in the got. */
 199               got[1] = (Elf32_Addr) l;
 200
 201               /* This function will be called to perform the relocation. */
 202               if (__builtin_expect (!profile, 1))
 203                 {
 204                   /* If a static application called us, then _dl_runtime_resolve is not
 205                      a function descriptor, but the *real* address of the function... */
 206                   if((unsigned long) &_dl_runtime_resolve & 3)
 207                     {
 208                       got[-2] = (Elf32_Addr) ((struct fdesc *)
 209                                   ((unsigned long) &_dl_runtime_resolve & ~3))->ip;
 210                     }
 211                   else
 212                     {
 213                       /* Static executable! */
 214                       got[-2] = (Elf32_Addr) &_dl_runtime_resolve;
 215                     }
 216                 }
 217               else
 218                 {
 219                   if (GLRO(dl_profile) != NULL
 220                       && _dl_name_match_p (GLRO(dl_profile), l))
 221                     {
 222                       /* This is the object we are looking for.  Say that
 223                          we really want profiling and the timers are
 224                          started.  */
 225                       GL(dl_profile_map) = l;
 226                     }
 227
 228                   if((unsigned long) &_dl_runtime_profile & 3)
 229                     {
 230                       got[-2] = (Elf32_Addr) ((struct fdesc *)
 231                                   ((unsigned long) &_dl_runtime_profile & ~3))->ip;
 232                     }
 233                   else
 234                     {
 235                       /* Static executable */
 236                       got[-2] = (Elf32_Addr) &_dl_runtime_profile;
 237                     }
 238                 }
 239               /* Plunk in the gp of this function descriptor so we
 240                  can make the call to _dl_runtime_xxxxxx */
 241               got[-1] = ltp;
 242               break;
 243               /* Done looking for the GOT, and stub is setup */
 244             } /* else we found the GOT */
 245         } /* for, walk the relocs backwards */
 246
 247       if(!got)
 248         return 0; /* No lazy linking for you! */
 249
 250       /* Process all the relocs, now that we know the GOT... */
 251       for (iplt = jmprel; iplt < end_jmprel; iplt += sizeof (Elf32_Rela))
 252         {
 253           reloc = (const Elf32_Rela *) iplt;
 254           r_type = ELF32_R_TYPE (reloc->r_info);
 255           r_sym = ELF32_R_SYM (reloc->r_info);
 256
 257           if (__builtin_expect (r_type == R_PARISC_IPLT, 1))
 258             {
 259               fptr = (struct fdesc *) (reloc->r_offset + l_addr);
 260               if (r_sym != 0)
 261                 {
 262                   /* Relocate the pointer to the stub.  */
 263                   fptr->ip = (Elf32_Addr) got - GOT_FROM_PLT_STUB;
 264
 265                   /* Instead of the LTP value, we put the reloc offset
 266                      here.  The trampoline code will load the proper
 267                      LTP and pass the reloc offset to the fixup
 268                      function.  */
 269                   fptr->gp = iplt - jmprel;
 270                 } /* r_sym != 0 */
 271               else
 272                 {
 273                   /* Relocate this *ABS* entry.  */
 274                   fptr->ip = reloc->r_addend + l_addr;
 275                   fptr->gp = D_PTR (l, l_info[DT_PLTGOT]);
 276                 }
 277             } /* r_type == R_PARISC_IPLT */
 278         } /* for all the relocations */
 279     } /* if lazy */
 280   else
 281     {
 282       for (iplt = jmprel; iplt < end_jmprel; iplt += sizeof (Elf32_Rela))
 283         {
 284           reloc = (const Elf32_Rela *) iplt;
 285           r_type = ELF32_R_TYPE (reloc->r_info);
 286           r_sym = ELF32_R_SYM (reloc->r_info);
 287
 288           if (__builtin_expect ((r_type == R_PARISC_IPLT) && (r_sym == 0), 1))
 289             {
 290               fptr = (struct fdesc *) (reloc->r_offset + l_addr);
 291               /* Relocate this *ABS* entry, set only the gp, the rest is set later
 292                  when elf_machine_rela_relative is called (WITHOUT the linkmap)  */
 293               fptr->gp = D_PTR (l, l_info[DT_PLTGOT]);
 294             } /* r_type == R_PARISC_IPLT */
 295         } /* for all the relocations */
 296     }
 297   return lazy;
 298 }
 299
 300
 301 /* Names of the architecture-specific auditing callback functions.  */
 302 #define ARCH_LA_PLTENTER hppa_gnu_pltenter
 303 #define ARCH_LA_PLTEXIT hppa_gnu_pltexit
 304
 305 /* Initial entry point code for the dynamic linker.
 306    The C function `_dl_start' is the real entry point;
 307    its return value is the user program's entry point.  */
 308
 309 #define RTLD_START \
 310 /* Set up dp for any non-PIC lib constructors that may be called.  */   \
 311 static struct link_map * __attribute__((used))                          \
 312 set_dp (struct link_map *map)                                           \
 313 {                                                                       \
 314   register Elf32_Addr dp asm ("%r27");                                  \
 315   dp = D_PTR (map, l_info[DT_PLTGOT]);                                  \
 316   asm volatile ("" : : "r" (dp));                                       \
 317   return map;                                                           \
 318 }                                                                       \
 319                                                                         \
 320 asm (                                                                   \
 321 "       .text\n"                                                        \
 322 "       .globl _start\n"                                                \
 323 "       .type _start,@function\n"                                       \
 324 "_start:\n"                                                             \
 325         /* The kernel does not give us an initial stack frame. */       \
 326 "       ldo     64(%sp),%sp\n"                                          \
 327         /* Save the relevant arguments (yes, those are the correct      \
 328            registers, the kernel is weird) in their stack slots. */     \
 329 "       stw     %r25,-40(%sp)\n" /* argc */                             \
 330 "       stw     %r24,-44(%sp)\n" /* argv */                             \
 331                                                                         \
 332         /* We need the LTP, and we need it now.                         \
 333            $PIC_pcrel$0 points 8 bytes past the current instruction,    \
 334            just like a branch reloc.  This sequence gets us the         \
 335            runtime address of _DYNAMIC. */                              \
 336 "       bl      0f,%r19\n"                                              \
 337 "       depi    0,31,2,%r19\n"  /* clear priviledge bits */             \
 338 "0:     addil   L'_DYNAMIC - ($PIC_pcrel$0 - 8),%r19\n"                 \
 339 "       ldo     R'_DYNAMIC - ($PIC_pcrel$0 - 12)(%r1),%r26\n"           \
 340                                                                         \
 341         /* The link time address is stored in the first entry of the    \
 342            GOT.  */                                                     \
 343 "       addil   L'_GLOBAL_OFFSET_TABLE_ - ($PIC_pcrel$0 - 16),%r19\n"   \
 344 "       ldw     R'_GLOBAL_OFFSET_TABLE_ - ($PIC_pcrel$0 - 20)(%r1),%r20\n" \
 345                                                                         \
 346 "       sub     %r26,%r20,%r20\n"       /* Calculate load offset */     \
 347                                                                         \
 348         /* Rummage through the dynamic entries, looking for             \
 349            DT_PLTGOT.  */                                               \
 350 "       ldw,ma  8(%r26),%r19\n"                                         \
 351 "1:     cmpib,=,n 3,%r19,2f\n"  /* tag == DT_PLTGOT? */                 \
 352 "       cmpib,<>,n 0,%r19,1b\n"                                         \
 353 "       ldw,ma  8(%r26),%r19\n"                                         \
 354                                                                         \
 355         /* Uh oh!  We didn't find one.  Abort. */                       \
 356 "       iitlbp  %r0,(%sr0,%r0)\n"                                       \
 357                                                                         \
 358 "2:     ldw     -4(%r26),%r19\n"        /* Found it, load value. */     \
 359 "       add     %r19,%r20,%r19\n"       /* And add the load offset. */  \
 360                                                                         \
 361         /* Our initial stack layout is rather different from everyone   \
 362            else's due to the unique PA-RISC ABI.  As far as I know it   \
 363            looks like this:                                             \
 364                                                                         \
 365            -----------------------------------  (this frame created above) \
 366            |         32 bytes of magic       |                          \
 367            |---------------------------------|                          \
 368            | 32 bytes argument/sp save area  |                          \
 369            |---------------------------------|  ((current->mm->env_end) \
 370            |         N bytes of slack        |   + 63 & ~63)            \
 371            |---------------------------------|                          \
 372            |      envvar and arg strings     |                          \
 373            |---------------------------------|                          \
 374            |        ELF auxiliary info       |                          \
 375            |         (up to 28 words)        |                          \
 376            |---------------------------------|                          \
 377            |  Environment variable pointers  |                          \
 378            |         upwards to NULL         |                          \
 379            |---------------------------------|                          \
 380            |        Argument pointers        |                          \
 381            |         upwards to NULL         |                          \
 382            |---------------------------------|                          \
 383            |          argc (1 word)          |                          \
 384            -----------------------------------                          \
 385                                                                         \
 386           So, obviously, we can't just pass %sp to _dl_start.  That's   \
 387           okay, argv-4 will do just fine.                               \
 388                                                                         \
 389           The pleasant part of this is that if we need to skip          \
 390           arguments we can just decrement argc and move argv, because   \
 391           the stack pointer is utterly unrelated to the location of     \
 392           the environment and argument vectors. */                      \
 393                                                                         \
 394         /* This is always within range so we'll be okay. */             \
 395 "       bl      _dl_start,%rp\n"                                        \
 396 "       ldo     -4(%r24),%r26\n"                                        \
 397                                                                         \
 398 "       .globl _dl_start_user\n"                                        \
 399 "       .type _dl_start_user,@function\n"                               \
 400 "_dl_start_user:\n"                                                     \
 401         /* Save the entry point in %r3. */                              \
 402 "       copy    %ret0,%r3\n"                                            \
 403                                                                         \
 404         /* Remember the lowest stack address. */                        \
 405 "       addil   LT'__libc_stack_end,%r19\n"                             \
 406 "       ldw     RT'__libc_stack_end(%r1),%r20\n"                        \
 407 "       stw     %sp,0(%r20)\n"                                          \
 408                                                                         \
 409         /* See if we were called as a command with the executable file  \
 410            name as an extra leading argument. */                        \
 411 "       addil   LT'_dl_skip_args,%r19\n"                                \
 412 "       ldw     RT'_dl_skip_args(%r1),%r20\n"                           \
 413 "       ldw     0(%r20),%r20\n"                                         \
 414                                                                         \
 415 "       ldw     -40(%sp),%r25\n"        /* argc */                      \
 416 "       comib,= 0,%r20,.Lnofix\n"       /* FIXME: Mispredicted branch */\
 417 "       ldw     -44(%sp),%r24\n"        /* argv (delay slot) */         \
 418                                                                         \
 419 "       sub     %r25,%r20,%r25\n"                                       \
 420 "       stw     %r25,-40(%sp)\n"                                        \
 421 "       sh2add  %r20,%r24,%r24\n"                                       \
 422 "       stw     %r24,-44(%sp)\n"                                        \
 423                                                                         \
 424 ".Lnofix:\n"                                                            \
 425 "       addil   LT'_rtld_local,%r19\n"                                  \
 426 "       ldw     RT'_rtld_local(%r1),%r26\n"                             \
 427 "       bl      set_dp, %r2\n"                                          \
 428 "       ldw     0(%r26),%r26\n"                                         \
 429                                                                         \
 430         /* Call _dl_init(_dl_loaded, argc, argv, envp). */              \
 431 "       copy    %r28,%r26\n"                                            \
 432                                                                         \
 433         /* envp = argv + argc + 1 */                                    \
 434 "       sh2add  %r25,%r24,%r23\n"                                       \
 435 "       bl      _dl_init,%r2\n"                                         \
 436 "       ldo     4(%r23),%r23\n" /* delay slot */                        \
 437                                                                         \
 438         /* Reload argc, argv to the registers start.S expects.  */      \
 439 "       ldw     -40(%sp),%r25\n"                                        \
 440 "       ldw     -44(%sp),%r24\n"                                        \
 441                                                                         \
 442         /* _dl_fini is a local function in the loader, so we construct  \
 443            a false OPD here and pass this to the application.  */       \
 444         /* FIXME: Should be able to use P%, and LR RR to have the       \
 445            the linker construct a proper OPD.  */                       \
 446 "       .section .data\n"                                               \
 447 "__dl_fini_plabel:\n"                                                   \
 448 "       .word   _dl_fini\n"                                             \
 449 "       .word   0xdeadbeef\n"                                           \
 450 "       .previous\n"                                                    \
 451                                                                         \
 452         /* %r3 contains a function pointer, we need to mask out the     \
 453            lower bits and load the gp and jump address. */              \
 454 "       depi    0,31,2,%r3\n"                                           \
 455 "       ldw     0(%r3),%r2\n"                                           \
 456 "       addil   LT'__dl_fini_plabel,%r19\n"                             \
 457 "       ldw     RT'__dl_fini_plabel(%r1),%r23\n"                        \
 458 "       stw     %r19,4(%r23)\n"                                         \
 459 "       ldw     4(%r3),%r19\n"  /* load the object's gp */              \
 460 "       bv      %r0(%r2)\n"                                             \
 461 "       depi    2,31,2,%r23\n"  /* delay slot */                        \
 462 );
 463
 464 /* ELF_RTYPE_CLASS_PLT iff TYPE describes relocation of a PLT entry or
 465    a TLS variable, so references should not be allowed to define the value.
 466    ELF_RTYPE_CLASS_COPY iff TYPE should not be allowed to resolve to one
 467    of the main executable's symbols, as for a COPY reloc.  */
 468 #if !defined RTLD_BOOTSTRAP
 469 # define elf_machine_type_class(type)                           \
 470   ((((type) == R_PARISC_IPLT                                    \
 471   || (type) == R_PARISC_EPLT                                    \
 472   || (type) == R_PARISC_TLS_DTPMOD32                            \
 473   || (type) == R_PARISC_TLS_DTPOFF32                            \
 474   || (type) == R_PARISC_TLS_TPREL32)                            \
 475   * ELF_RTYPE_CLASS_PLT)                                        \
 476   | (((type) == R_PARISC_COPY) * ELF_RTYPE_CLASS_COPY))
 477 #else
 478 #define elf_machine_type_class(type)                            \
 479  ((((type) == R_PARISC_IPLT                                     \
 480    || (type) == R_PARISC_EPLT)                                  \
 481    * ELF_RTYPE_CLASS_PLT)                                       \
 482    | (((type) == R_PARISC_COPY) * ELF_RTYPE_CLASS_COPY))
 483 #endif
 484
 485 /* Used by the runtime in fixup to figure out if reloc is *really* PLT */
 486 #define ELF_MACHINE_JMP_SLOT R_PARISC_IPLT
 487 #define ELF_MACHINE_SIZEOF_JMP_SLOT PLT_ENTRY_SIZE
 488
 489 /* We only use RELA. */
 490 #define ELF_MACHINE_NO_REL 1
 491 #define ELF_MACHINE_NO_RELA 0
 492
 493 /* Return the address of the entry point. */
 494 #define ELF_MACHINE_START_ADDRESS(map, start)                   \
 495 ({                                                              \
 496         ElfW(Addr) addr;                                        \
 497         DL_DT_FUNCTION_ADDRESS(map, start, static, addr)        \
 498         addr;                                                   \
 499 })
 500
 501 /* We define an initialization functions.  This is called very early in
 502  *    _dl_sysdep_start.  */
 503 #define DL_PLATFORM_INIT dl_platform_init ()
 504
 505 static inline void __attribute__ ((unused))
 506 dl_platform_init (void)
 507 {
 508         if (GLRO(dl_platform) != NULL && *GLRO(dl_platform) == '\0')
 509         /* Avoid an empty string which would disturb us.  */
 510                 GLRO(dl_platform) = NULL;
 511 }
 512
 513 #endif /* !dl_machine_h */
 514
 515 /* These are only actually used where RESOLVE_MAP is defined, anyway. */
 516 #ifdef RESOLVE_MAP
 517
 518 #define reassemble_21(as21) \
 519   (  (((as21) & 0x100000) >> 20) \
 520    | (((as21) & 0x0ffe00) >> 8) \
 521    | (((as21) & 0x000180) << 7) \
 522    | (((as21) & 0x00007c) << 14) \
 523    | (((as21) & 0x000003) << 12))
 524
 525 #define reassemble_14(as14) \
 526   (  (((as14) & 0x1fff) << 1) \
 527    | (((as14) & 0x2000) >> 13))
 528
 529 auto void __attribute__((always_inline))
 530 elf_machine_rela (struct link_map *map,
 531                   const Elf32_Rela *reloc,
 532                   const Elf32_Sym *sym,
 533                   const struct r_found_version *version,
 534                   void *const reloc_addr_arg,
 535                   int skip_ifunc)
 536 {
 537   Elf32_Addr *const reloc_addr = reloc_addr_arg;
 538   const Elf32_Sym *const refsym = sym;
 539   unsigned long const r_type = ELF32_R_TYPE (reloc->r_info);
 540   struct link_map *sym_map;
 541   Elf32_Addr value;
 542
 543 # if !defined RTLD_BOOTSTRAP && !defined HAVE_Z_COMBRELOC && !defined SHARED
 544   /* This is defined in rtld.c, but nowhere in the static libc.a; make the
 545      reference weak so static programs can still link.  This declaration
 546      cannot be done when compiling rtld.c (i.e.  #ifdef RTLD_BOOTSTRAP)
 547      because rtld.c contains the common defn for _dl_rtld_map, which is
 548      incompatible with a weak decl in the same file.  */
 549   weak_extern (GL(dl_rtld_map));
 550 # endif
 551
 552   /* RESOLVE_MAP will return a null value for undefined syms, and
 553      non-null for all other syms.  In particular, relocs with no
 554      symbol (symbol index of zero), also called *ABS* relocs, will be
 555      resolved to MAP.  (The first entry in a symbol table is all
 556      zeros, and an all zero Elf32_Sym has a binding of STB_LOCAL.)
 557      See RESOLVE_MAP definition in elf/dl-reloc.c  */
 558 # ifdef RTLD_BOOTSTRAP
 559   /* RESOLVE_MAP in rtld.c doesn't have the local sym test.  */
 560   sym_map = (ELF32_ST_BIND (sym->st_info) != STB_LOCAL
 561              ? RESOLVE_MAP (&sym, version, r_type) : map);
 562 # else
 563   sym_map = RESOLVE_MAP (&sym, version, r_type);
 564 # endif
 565
 566   if (sym_map)
 567     {
 568       value = sym ? sym_map->l_addr + sym->st_value : 0;
 569       value += reloc->r_addend;
 570     }
 571   else
 572     value = 0;
 573
 574   switch (r_type)
 575     {
 576     case R_PARISC_DIR32:
 577       /* .eh_frame can have unaligned relocs.  */
 578       if ((unsigned long) reloc_addr_arg & 3)
 579         {
 580           char *rel_addr = (char *) reloc_addr_arg;
 581           rel_addr[0] = value >> 24;
 582           rel_addr[1] = value >> 16;
 583           rel_addr[2] = value >> 8;
 584           rel_addr[3] = value;
 585           return;
 586         }
 587       break;
 588
 589     case R_PARISC_DIR21L:
 590       {
 591         unsigned int insn = *(unsigned int *)reloc_addr;
 592         value = sym_map->l_addr + sym->st_value
 593                 + ((reloc->r_addend + 0x1000) & -0x2000);
 594         value = value >> 11;
 595         insn = (insn &~ 0x1fffff) | reassemble_21 (value);
 596         *(unsigned int *)reloc_addr = insn;
 597       }
 598       return;
 599
 600     case R_PARISC_DIR14R:
 601       {
 602         unsigned int insn = *(unsigned int *)reloc_addr;
 603         value = ((sym_map->l_addr + sym->st_value) & 0x7ff)
 604                 + (((reloc->r_addend & 0x1fff) ^ 0x1000) - 0x1000);
 605         insn = (insn &~ 0x3fff) | reassemble_14 (value);
 606         *(unsigned int *)reloc_addr = insn;
 607       }
 608       return;
 609
 610     case R_PARISC_PLABEL32:
 611       /* Easy rule: If there is a symbol and it is global, then we
 612          need to make a dynamic function descriptor.  Otherwise we
 613          have the address of a PLT slot for a local symbol which we
 614          know to be unique. */
 615       if (sym == NULL
 616           || sym_map == NULL
 617           || ELF32_ST_BIND (sym->st_info) == STB_LOCAL)
 618         {
 619           break;
 620         }
 621       /* Set bit 30 to indicate to $$dyncall that this is a PLABEL.
 622          We have to do this outside of the generic function descriptor
 623          code, since it doesn't know about our requirement for setting
 624          protection bits */
 625       value = (Elf32_Addr)((unsigned int)_dl_make_fptr (sym_map, sym, value) | 2);
 626       break;
 627
 628     case R_PARISC_PLABEL21L:
 629     case R_PARISC_PLABEL14R:
 630       {
 631         unsigned int insn = *(unsigned int *)reloc_addr;
 632
 633         if (__builtin_expect (sym == NULL, 0))
 634           break;
 635
 636         value = (Elf32_Addr)((unsigned int)_dl_make_fptr (sym_map, sym, value) | 2);
 637
 638         if (r_type == R_PARISC_PLABEL21L)
 639           {
 640             value >>= 11;
 641             insn = (insn &~ 0x1fffff) | reassemble_21 (value);
 642           }
 643         else
 644           {
 645             value &= 0x7ff;
 646             insn = (insn &~ 0x3fff) | reassemble_14 (value);
 647           }
 648
 649         *(unsigned int *)reloc_addr = insn;
 650       }
 651       return;
 652
 653     case R_PARISC_IPLT:
 654       if (__builtin_expect (sym_map != NULL, 1))
 655         {
 656           elf_machine_fixup_plt (NULL, sym_map, reloc, reloc_addr,
 657                                  DL_FIXUP_MAKE_VALUE(sym_map, value));
 658         }
 659       else
 660         {
 661           /* If we get here, it's a (weak) undefined sym.  */
 662           elf_machine_fixup_plt (NULL, map, reloc, reloc_addr,
 663                                  DL_FIXUP_MAKE_VALUE(map, value));
 664         }
 665       return;
 666
 667     case R_PARISC_COPY:
 668       if (__builtin_expect (sym == NULL, 0))
 669         /* This can happen in trace mode if an object could not be
 670            found.  */
 671         break;
 672       if (__builtin_expect (sym->st_size > refsym->st_size, 0)
 673           || (__builtin_expect (sym->st_size < refsym->st_size, 0)
 674               && __builtin_expect (GLRO(dl_verbose), 0)))
 675         {
 676           const char *strtab;
 677
 678           strtab = (const char *) D_PTR (map, l_info[DT_STRTAB]);
 679           _dl_error_printf ("%s: Symbol `%s' has different size in shared object, "
 680                             "consider re-linking\n",
 681                             RTLD_PROGNAME, strtab + refsym->st_name);
 682         }
 683       memcpy (reloc_addr_arg, (void *) value,
 684               MIN (sym->st_size, refsym->st_size));
 685       return;
 686
 687 #if !defined RTLD_BOOTSTRAP
 688     case R_PARISC_TLS_DTPMOD32:
 689       value = sym_map->l_tls_modid;
 690       break;
 691
 692     case R_PARISC_TLS_DTPOFF32:
 693       /* During relocation all TLS symbols are defined and used.
 694          Therefore the offset is already correct.  */
 695       if (sym != NULL)
 696         *reloc_addr = sym->st_value;
 697       return;
 698
 699     case R_PARISC_TLS_TPREL32:
 700       /* The offset is negative, forward from the thread pointer */
 701       if (sym != NULL)
 702         {
 703           CHECK_STATIC_TLS (map, sym_map);
 704           value = sym_map->l_tls_offset + sym->st_value + reloc->r_addend;
 705         }
 706       break;
 707 #endif  /* use TLS */
 708
 709     case R_PARISC_NONE: /* Alright, Wilbur. */
 710       return;
 711
 712     default:
 713       _dl_reloc_bad_type (map, r_type, 0);
 714     }
 715
 716   *reloc_addr = value;
 717 }
 718
 719 /* hppa doesn't have an R_PARISC_RELATIVE reloc, but uses relocs with
 720    ELF32_R_SYM (info) == 0 for a similar purpose.  */
 721 auto void __attribute__((always_inline))
 722 elf_machine_rela_relative (Elf32_Addr l_addr,
 723                            const Elf32_Rela *reloc,
 724                            void *const reloc_addr_arg)
 725 {
 726   unsigned long const r_type = ELF32_R_TYPE (reloc->r_info);
 727   Elf32_Addr *const reloc_addr = reloc_addr_arg;
 728   static char msgbuf[] = { "Unknown" };
 729   struct link_map map;
 730   Elf32_Addr value;
 731
 732   value = l_addr + reloc->r_addend;
 733
 734   if (ELF32_R_SYM (reloc->r_info) != 0){
 735     _dl_error_printf ("%s: In elf_machine_rela_relative "
 736                       "ELF32_R_SYM (reloc->r_info) != 0. Aborting.",
 737                       RTLD_PROGNAME);
 738     ABORT_INSTRUCTION;  /* Crash. */
 739   }
 740
 741   switch (r_type)
 742     {
 743     case R_PARISC_DIR32:
 744       /* .eh_frame can have unaligned relocs.  */
 745       if ((unsigned long) reloc_addr_arg & 3)
 746         {
 747           char *rel_addr = (char *) reloc_addr_arg;
 748           rel_addr[0] = value >> 24;
 749           rel_addr[1] = value >> 16;
 750           rel_addr[2] = value >> 8;
 751           rel_addr[3] = value;
 752           return;
 753         }
 754       break;
 755
 756     case R_PARISC_PLABEL32:
 757       break;
 758
 759     case R_PARISC_IPLT: /* elf_machine_runtime_setup already set gp */
 760       break;
 761
 762     case R_PARISC_NONE:
 763       return;
 764
 765     default: /* Bad reloc, map unknown (really it's the current map) */
 766       map.l_name = msgbuf;
 767       _dl_reloc_bad_type (&map, r_type, 0);
 768       return;
 769     }
 770
 771   *reloc_addr = value;
 772 }
 773
 774 auto void __attribute__((always_inline))
 775 elf_machine_lazy_rel (struct link_map *map,
 776                       Elf32_Addr l_addr, const Elf32_Rela *reloc,
 777                       int skip_ifunc)
 778 {
 779   /* We don't have anything to do here.  elf_machine_runtime_setup has
 780      done all the relocs already.  */
 781 }
 782
 783 #endif /* RESOLVE_MAP */