2.3.4-15

[glibc.git] / sysdeps / hppa / dl-machine.h

/* Machine-dependent ELF dynamic relocation inline functions.  PA-RISC version.
   Copyright (C) 1995-1997,1999-2003
        Free Software Foundation, Inc.
   Contributed by David Huggins-Daines <dhd@debian.org>
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#ifndef dl_machine_h
#define dl_machine_h 1

#define ELF_MACHINE_NAME "hppa"

#include <sys/param.h>
#include <assert.h>
#include <string.h>
#include <link.h>
#include <errno.h>
#include <dl-fptr.h>
#include <abort-instr.h>

# define VALID_ELF_OSABI(osabi)         ((osabi == ELFOSABI_SYSV) || (osabi == ELFOSABI_LINUX))
# define VALID_ELF_ABIVERSION(ver)      (ver == 0)
# define VALID_ELF_HEADER(hdr,exp,size) \
  memcmp (hdr,exp,size-2) == 0 \
  && VALID_ELF_OSABI (hdr[EI_OSABI]) \
  && VALID_ELF_ABIVERSION (hdr[EI_ABIVERSION])

/* These two definitions must match the definition of the stub in 
   bfd/elf32-hppa.c (see plt_stub[]).
   
   a. Define the size of the *entire* stub we place at the end of the PLT
   table (right up against the GOT).
   
   b. Define the number of bytes back from the GOT to the entry point of
   the PLT stub. You see the PLT stub must be entered in the middle
   so it can depwi to find it's own address (long jump stub) 
   
   c. Define the size of a single PLT entry so we can jump over the
   last entry to get the stub address */
        
#define SIZEOF_PLT_STUB (7*4)
#define GOT_FROM_PLT_STUB (4*4)
#define PLT_ENTRY_SIZE (2*4)

/* Initialize the function descriptor table before relocations */
static inline void
__hppa_init_bootstrap_fdesc_table (struct link_map *map)
{
  ElfW(Addr) *boot_table;

  /* Careful: this will be called before got has been relocated... */
  ELF_MACHINE_LOAD_ADDRESS(boot_table,_dl_boot_fptr_table);

  map->l_mach.fptr_table_len = ELF_MACHINE_BOOT_FPTR_TABLE_LEN;
  map->l_mach.fptr_table = boot_table;
}

#define ELF_MACHINE_BEFORE_RTLD_RELOC(dynamic_info)             \
        __hppa_init_bootstrap_fdesc_table (&bootstrap_map);

/* Return nonzero iff ELF header is compatible with the running host.  */
static inline int
elf_machine_matches_host (const Elf32_Ehdr *ehdr)
{
  return ehdr->e_machine == EM_PARISC;
}

/* Return the link-time address of _DYNAMIC.  */
static inline Elf32_Addr
elf_machine_dynamic (void) __attribute__ ((const));

static inline Elf32_Addr
elf_machine_dynamic (void)
{
  Elf32_Addr dynamic;

  asm ("b,l     1f,%0\n"
"       depi    0,31,2,%0\n"
"1:     addil   L'_GLOBAL_OFFSET_TABLE_ - ($PIC_pcrel$0 - 8),%0\n"
"       ldw     R'_GLOBAL_OFFSET_TABLE_ - ($PIC_pcrel$0 - 12)(%%r1),%0\n"
       : "=r" (dynamic) : : "r1");

  return dynamic;
}

/* Return the run-time load address of the shared object.  */
static inline Elf32_Addr
elf_machine_load_address (void) __attribute__ ((const));

static inline Elf32_Addr
elf_machine_load_address (void)
{
  Elf32_Addr dynamic;

  asm (
"       b,l     1f,%0\n"
"       depi    0,31,2,%0\n"
"1:     addil   L'_DYNAMIC - ($PIC_pcrel$0 - 8),%0\n"
"       ldo     R'_DYNAMIC - ($PIC_pcrel$0 - 12)(%%r1),%0\n"
   : "=r" (dynamic) : : "r1");

  return dynamic - elf_machine_dynamic ();
}

/* Fixup a PLT entry to bounce directly to the function at VALUE.  
   Optimized non-profile version. */
static inline Elf32_Addr
elf_machine_fixup_plt (struct link_map *map, lookup_t t,
                       const Elf32_Rela *reloc,
                       Elf32_Addr *reloc_addr, Elf32_Addr value)
{
  /* map is the link_map for the caller, t is the link_map for the object
     being called */
  reloc_addr[1] = D_PTR (t, l_info[DT_PLTGOT]);
  reloc_addr[0] = value;
  /* Return the PLT slot rather than the function value so that the
     trampoline can load the new LTP. */
  return (Elf32_Addr) reloc_addr;
}

/* Fixup a PLT entry to bounce directly to the function at VALUE.  */
#define ELF_MACHINE_PROFILE_FIXUP_PLT elf_machine_profile_fixup_plt
static inline Elf32_Addr
elf_machine_profile_fixup_plt (struct link_map *map, lookup_t t,
                       const Elf32_Rela *reloc,
                       Elf32_Addr *reloc_addr, Elf32_Addr value)
{
  if(__builtin_expect (t == NULL, 1)) 
    return (Elf32_Addr) reloc_addr;
  /* Return the PLT slot rather than the function value so that the
     trampoline can load the new LTP. */
  return (Elf32_Addr) elf_machine_fixup_plt(map, t, reloc, reloc_addr, value);
}

/* Return the final value of a plt relocation.  */
static inline Elf32_Addr
elf_machine_plt_value (struct link_map *map, const Elf32_Rela *reloc,
                       Elf32_Addr value)
{
  /* We are rela only */
  return value + reloc->r_addend;
}

/* Set up the loaded object described by L so its unrelocated PLT
   entries will jump to the on-demand fixup code in dl-runtime.c.  */

static inline int
elf_machine_runtime_setup (struct link_map *l, int lazy, int profile)
{
  Elf32_Addr *got = NULL;
  Elf32_Addr l_addr, iplt, jmprel, end_jmprel, r_type, r_sym;
  const Elf32_Rela *reloc;
  struct fdesc *fptr;
  static union {
    unsigned char c[8];
    Elf32_Addr i[2];
  } sig = {{0x00,0xc0,0xff,0xee, 0xde,0xad,0xbe,0xef}};
                
  /* If we don't have a PLT we can just skip all this... */
  if (__builtin_expect (l->l_info[DT_JMPREL] == NULL,0))
    return lazy;
  
  /* All paths use these values */ 
  l_addr = l->l_addr;
  jmprel = D_PTR(l, l_info[DT_JMPREL]);
  end_jmprel = jmprel + l->l_info[DT_PLTRELSZ]->d_un.d_val;
  
  extern void _dl_runtime_resolve (void);
  extern void _dl_runtime_profile (void);
  
  /* Linking lazily */
  if (lazy)
    {
      /* FIXME: Search for the got, but backwards through the relocs, technically we should
         find it on the first try. However, assuming the relocs got out of order the 
         routine is made a bit more robust by searching them all in case of failure. */
      for (iplt = (end_jmprel - sizeof(Elf32_Rela)); iplt >= jmprel; iplt -= sizeof (Elf32_Rela))
        {
              
          reloc = (const Elf32_Rela *) iplt;
          r_type = ELF32_R_TYPE (reloc->r_info);
          r_sym = ELF32_R_SYM (reloc->r_info);

          got = (Elf32_Addr *) (reloc->r_offset + l_addr + PLT_ENTRY_SIZE + SIZEOF_PLT_STUB);

          /* If we aren't an IPLT, and we aren't NONE then it's a bad reloc */
          if (__builtin_expect (r_type != R_PARISC_IPLT, 0))
            {
              if (__builtin_expect (r_type != R_PARISC_NONE, 0))
                _dl_reloc_bad_type (l, r_type, 1);
              continue;
            }
        
          /* Check for the plt_stub that binutils placed here for us 
             to use with _dl_runtime_resolve  */
          if (got[-2] != sig.i[0] || got[-1] != sig.i[1])
            {
              got = NULL; /* Not the stub... keep looking */
            } 
          else 
            {
              /* Found the GOT! */              
              register Elf32_Addr ltp __asm__ ("%r19");
              /* Identify this shared object. */
              got[1] = (Elf32_Addr) l;

              /* This function will be called to perform the relocation. */
              if (__builtin_expect (!profile, 1))
                {
                  /* If a static application called us, then _dl_runtime_resolve is not
                     a function descriptor, but the *real* address of the function... */
                  if((unsigned long) &_dl_runtime_resolve & 3)
                    {
                      got[-2] = (Elf32_Addr) ((struct fdesc *) 
                                  ((unsigned long) &_dl_runtime_resolve & ~3))->ip;
                    }
                  else
                    {
                      /* Static executable! */
                      got[-2] = (Elf32_Addr) &_dl_runtime_resolve;
                    }
                }
              else
                {
                  if (_dl_name_match_p (GLRO(dl_profile), l))
                    {
                      /* This is the object we are looking for.  Say that
                         we really want profiling and the timers are
                         started.  */
                      GL(dl_profile_map) = l;
                    }

                  if((unsigned long) &_dl_runtime_resolve & 3)
                    {
                      got[-2] = (Elf32_Addr) ((struct fdesc *)
                                  ((unsigned long) &_dl_runtime_profile & ~3))->ip;
                    }
                  else
                    {
                      /* Static executable */
                      got[-2] = (Elf32_Addr) &_dl_runtime_profile;
                    }
                }
              /* Plunk in the gp of this function descriptor so we 
                 can make the call to _dl_runtime_xxxxxx */
              got[-1] = ltp;
              break;
              /* Done looking for the GOT, and stub is setup */
            } /* else we found the GOT */
        } /* for, walk the relocs backwards */

      if(!got) 
        return 0; /* No lazy linking for you! */
  
      /* Process all the relocs, now that we know the GOT... */    
      for (iplt = jmprel; iplt < end_jmprel; iplt += sizeof (Elf32_Rela))
        {
          reloc = (const Elf32_Rela *) iplt;
          r_type = ELF32_R_TYPE (reloc->r_info);
          r_sym = ELF32_R_SYM (reloc->r_info);

          if (__builtin_expect (r_type == R_PARISC_IPLT, 1))
            {
              fptr = (struct fdesc *) (reloc->r_offset + l_addr);
              if (r_sym != 0)
                {
                  /* Relocate the pointer to the stub.  */
                  fptr->ip = (Elf32_Addr) got - GOT_FROM_PLT_STUB;

                  /* Instead of the LTP value, we put the reloc offset
                     here.  The trampoline code will load the proper
                     LTP and pass the reloc offset to the fixup
                     function.  */
                  fptr->gp = iplt - jmprel;
                } /* r_sym != 0 */
              else
                {
                  /* Relocate this *ABS* entry.  */
                  fptr->ip = reloc->r_addend + l_addr;
                  fptr->gp = D_PTR (l, l_info[DT_PLTGOT]);
                }
            } /* r_type == R_PARISC_IPLT */
        } /* for all the relocations */ 
    } /* if lazy */
  else
    {
      for (iplt = jmprel; iplt < end_jmprel; iplt += sizeof (Elf32_Rela))
        {
          reloc = (const Elf32_Rela *) iplt;
          r_type = ELF32_R_TYPE (reloc->r_info);
          r_sym = ELF32_R_SYM (reloc->r_info);

          if (__builtin_expect ((r_type == R_PARISC_IPLT) && (r_sym == 0), 1))
            {
              fptr = (struct fdesc *) (reloc->r_offset + l_addr);
              /* Relocate this *ABS* entry, set only the gp, the rest is set later
                 when elf_machine_rela_relative is called (WITHOUT the linkmap)  */
              fptr->gp = D_PTR (l, l_info[DT_PLTGOT]);
            } /* r_type == R_PARISC_IPLT */
        } /* for all the relocations */ 
    }     
  return lazy;
}

/* Initial entry point code for the dynamic linker.
   The C function `_dl_start' is the real entry point;
   its return value is the user program's entry point.  */

#define RTLD_START \
/* Set up dp for any non-PIC lib constructors that may be called.  */   \
static struct link_map * __attribute__((used))                          \
set_dp (struct link_map *map)                                           \
{                                                                       \
  register Elf32_Addr dp asm ("%r27");                                  \
  dp = D_PTR (map, l_info[DT_PLTGOT]);                                  \
  asm volatile ("" : : "r" (dp));                                       \
  return map;                                                           \
}                                                                       \
                                                                        \
asm (                                                                   \
"       .text\n"                                                        \
"       .globl _start\n"                                                \
"       .type _start,@function\n"                                       \
"_start:\n"                                                             \
        /* The kernel does not give us an initial stack frame. */       \
"       ldo     64(%sp),%sp\n"                                          \
        /* Save the relevant arguments (yes, those are the correct      \
           registers, the kernel is weird) in their stack slots. */     \
"       stw     %r25,-40(%sp)\n" /* argc */                             \
"       stw     %r24,-44(%sp)\n" /* argv */                             \
                                                                        \
        /* We need the LTP, and we need it now.                         \
           $PIC_pcrel$0 points 8 bytes past the current instruction,    \
           just like a branch reloc.  This sequence gets us the         \
           runtime address of _DYNAMIC. */                              \
"       bl      0f,%r19\n"                                              \
"       depi    0,31,2,%r19\n"  /* clear priviledge bits */             \
"0:     addil   L'_DYNAMIC - ($PIC_pcrel$0 - 8),%r19\n"                 \
"       ldo     R'_DYNAMIC - ($PIC_pcrel$0 - 12)(%r1),%r26\n"           \
                                                                        \
        /* The link time address is stored in the first entry of the    \
           GOT.  */                                                     \
"       addil   L'_GLOBAL_OFFSET_TABLE_ - ($PIC_pcrel$0 - 16),%r19\n"   \
"       ldw     R'_GLOBAL_OFFSET_TABLE_ - ($PIC_pcrel$0 - 20)(%r1),%r20\n" \
                                                                        \
"       sub     %r26,%r20,%r20\n"       /* Calculate load offset */     \
                                                                        \
        /* Rummage through the dynamic entries, looking for             \
           DT_PLTGOT.  */                                               \
"       ldw,ma  8(%r26),%r19\n"                                         \
"1:     cmpib,=,n 3,%r19,2f\n"  /* tag == DT_PLTGOT? */                 \
"       cmpib,<>,n 0,%r19,1b\n"                                         \
"       ldw,ma  8(%r26),%r19\n"                                         \
                                                                        \
        /* Uh oh!  We didn't find one.  Abort. */                       \
"       iitlbp  %r0,(%r0)\n"                                            \
                                                                        \
"2:     ldw     -4(%r26),%r19\n"        /* Found it, load value. */     \
"       add     %r19,%r20,%r19\n"       /* And add the load offset. */  \
                                                                        \
        /* Our initial stack layout is rather different from everyone   \
           else's due to the unique PA-RISC ABI.  As far as I know it   \
           looks like this:                                             \
                                                                        \
           -----------------------------------  (this frame created above) \
           |         32 bytes of magic       |                          \
           |---------------------------------|                          \
           | 32 bytes argument/sp save area  |                          \
           |---------------------------------|  ((current->mm->env_end) \
           |         N bytes of slack        |   + 63 & ~63)            \
           |---------------------------------|                          \
           |      envvar and arg strings     |                          \
           |---------------------------------|                          \
           |        ELF auxiliary info       |                          \
           |         (up to 28 words)        |                          \
           |---------------------------------|                          \
           |  Environment variable pointers  |                          \
           |         upwards to NULL         |                          \
           |---------------------------------|                          \
           |        Argument pointers        |                          \
           |         upwards to NULL         |                          \
           |---------------------------------|                          \
           |          argc (1 word)          |                          \
           -----------------------------------                          \
                                                                        \
          So, obviously, we can't just pass %sp to _dl_start.  That's   \
          okay, argv-4 will do just fine.                               \
                                                                        \
          The pleasant part of this is that if we need to skip          \
          arguments we can just decrement argc and move argv, because   \
          the stack pointer is utterly unrelated to the location of     \
          the environment and argument vectors. */                      \
                                                                        \
        /* This is always within range so we'll be okay. */             \
"       bl      _dl_start,%rp\n"                                        \
"       ldo     -4(%r24),%r26\n"                                        \
                                                                        \
"       .globl _dl_start_user\n"                                        \
"       .type _dl_start_user,@function\n"                               \
"_dl_start_user:\n"                                                     \
        /* Save the entry point in %r3. */                              \
"       copy    %ret0,%r3\n"                                            \
                                                                        \
        /* Remember the lowest stack address. */                        \
"       addil   LT'__libc_stack_end,%r19\n"                             \
"       ldw     RT'__libc_stack_end(%r1),%r20\n"                        \
"       stw     %sp,0(%r20)\n"                                          \
                                                                        \
        /* See if we were called as a command with the executable file  \
           name as an extra leading argument. */                        \
"       addil   LT'_dl_skip_args,%r19\n"                                \
"       ldw     RT'_dl_skip_args(%r1),%r20\n"                           \
"       ldw     0(%r20),%r20\n"                                         \
                                                                        \
"       ldw     -40(%sp),%r25\n"        /* argc */                      \
"       comib,= 0,%r20,.Lnofix\n"       /* FIXME: Mispredicted branch */\
"       ldw     -44(%sp),%r24\n"        /* argv (delay slot) */         \
                                                                        \
"       sub     %r25,%r20,%r25\n"                                       \
"       stw     %r25,-40(%sp)\n"                                        \
"       sh2add  %r20,%r24,%r24\n"                                       \
"       stw     %r24,-44(%sp)\n"                                        \
                                                                        \
".Lnofix:\n"                                                            \
"       addil   LT'_rtld_local,%r19\n"                                  \
"       ldw     RT'_rtld_local(%r1),%r26\n"                             \
"       bl      set_dp, %r2\n"                                          \
"       ldw     0(%r26),%r26\n"                                         \
                                                                        \
        /* Call _dl_init(_dl_loaded, argc, argv, envp). */              \
"       copy    %r28,%r26\n"                                            \
                                                                        \
        /* envp = argv + argc + 1 */                                    \
"       sh2add  %r25,%r24,%r23\n"                                       \
"       bl      _dl_init_internal,%r2\n"                                \
"       ldo     4(%r23),%r23\n" /* delay slot */                        \
                                                                        \
        /* Reload argc, argv to the registers start.S expects.  */      \
"       ldw     -40(%sp),%r25\n"                                        \
"       ldw     -44(%sp),%r24\n"                                        \
                                                                        \
        /* _dl_fini does have a PLT slot now.  I don't know how to get  \
           to it though, so this hack will remain. */                   \
"       .section .data\n"                                               \
"__dl_fini_plabel:\n"                                                   \
"       .word   _dl_fini\n"                                             \
"       .word   0xdeadbeef\n"                                           \
"       .previous\n"                                                    \
                                                                        \
        /* %r3 contains a function pointer, we need to mask out the     \
           lower bits and load the gp and jump address. */              \
"       depi    0,31,2,%r3\n"                                           \
"       ldw     0(%r3),%r2\n"                                           \
"       addil   LT'__dl_fini_plabel,%r19\n"                             \
"       ldw     RT'__dl_fini_plabel(%r1),%r23\n"                        \
"       stw     %r19,4(%r23)\n"                                         \
"       ldw     4(%r3),%r19\n"  /* load the object's gp */              \
"       bv      %r0(%r2)\n"                                             \
"       depi    2,31,2,%r23\n"  /* delay slot */                        \
        );


/* This code gets called via the .plt stub, and is used in
   dl-runtime.c to call the `fixup' function and then redirect to the
   address it returns.
   
   WARNING: This template is also used by gcc's __cffc, and expects
   that the "bl" for fixup() exist at a particular offset.
   Do not change this template without changing gcc, while the prefix
   "bl" should fix everything so gcc finds the right spot, it will
   slow down __cffc when it attempts to call fixup to resolve function
   descriptor references. Please refer to gcc/gcc/config/pa/fptr.c
   
   Enter with r19 = reloc offset, r20 = got-8, r21 = fixup ltp.  */
#define TRAMPOLINE_TEMPLATE(tramp_name, fixup_name)                     \
  extern void tramp_name (void);                                        \
  asm (                                                                 \
 "      .text\n"                                                        \
        /* FAKE bl to provide gcc's __cffc with fixup's address */      \
 "      bl      " #fixup_name ",%r2\n" /* Runtime address of fixup */   \
 "      .globl " #tramp_name "\n"                                       \
 "      .type " #tramp_name ",@function\n"                              \
  #tramp_name ":\n"                                                     \
 "      .proc\n"                                                        \
 "      .callinfo frame=64,calls,save_rp\n"                             \
 "      .entry\n"                                                       \
        /* Save return pointer */                                       \
 "      stw     %r2,-20(%sp)\n"                                         \
        /* Save argument registers in the call stack frame. */          \
 "      stw     %r26,-36(%sp)\n"                                        \
 "      stw     %r25,-40(%sp)\n"                                        \
 "      stw     %r24,-44(%sp)\n"                                        \
 "      stw     %r23,-48(%sp)\n"                                        \
        /* Build a call frame, and save structure pointer. */           \
 "      stwm    %r28,64(%sp)\n"                                         \
                                                                        \
        /* Set up args to fixup func.  */                               \
 "      ldw     8+4(%r20),%r26\n" /* (1) got[1] == struct link_map */   \
 "      copy    %r19,%r25\n"      /* (2) reloc offset  */               \
 "      copy    %r2,%r24\n"       /* (3) profile_fixup needs rp */      \
                                                                        \
        /* Call the real address resolver. */                           \
 "      bl      " #fixup_name ",%r2\n"                                  \
 "      copy    %r21,%r19\n"      /* set fixup func ltp (DELAY SLOT)*/  \
                                                                        \
 "      ldw     0(%r28),%r22\n"   /* load up the returned func ptr */   \
 "      ldw     4(%r28),%r19\n"                                         \
 "      ldwm    -64(%sp),%r28\n"                                        \
        /* Arguments. */                                                \
 "      ldw     -36(%sp),%r26\n"                                        \
 "      ldw     -40(%sp),%r25\n"                                        \
 "      ldw     -44(%sp),%r24\n"                                        \
 "      ldw     -48(%sp),%r23\n"                                        \
        /* Call the real function. */                                   \
 "      bv      %r0(%r22)\n"                                            \
        /* Return pointer. */                                           \
 "      ldw     -20(%sp),%r2\n"                                         \
 "      .exit\n"                                                        \
 "      .procend\n");
  
#ifndef PROF
#define ELF_MACHINE_RUNTIME_TRAMPOLINE                  \
  TRAMPOLINE_TEMPLATE (_dl_runtime_resolve, fixup);     \
  TRAMPOLINE_TEMPLATE (_dl_runtime_profile, profile_fixup);
#else
#define ELF_MACHINE_RUNTIME_TRAMPOLINE                  \
  TRAMPOLINE_TEMPLATE (_dl_runtime_resolve, fixup);     \
  strong_alias (_dl_runtime_resolve, _dl_runtime_profile);
#endif

/* ELF_RTYPE_CLASS_PLT iff TYPE describes relocation of a PLT entry, so
   PLT entries should not be allowed to define the value.
   ELF_RTYPE_CLASS_NOCOPY iff TYPE should not be allowed to resolve to one
   of the main executable's symbols, as for a COPY reloc.  */
#define elf_machine_type_class(type) \
  ((((type) == R_PARISC_IPLT || (type) == R_PARISC_EPLT)        \
    * ELF_RTYPE_CLASS_PLT)                                      \
   | (((type) == R_PARISC_COPY) * ELF_RTYPE_CLASS_COPY))

/* Used by the runtime in fixup to figure out if reloc is *really* PLT */
#define ELF_MACHINE_JMP_SLOT R_PARISC_IPLT
#define ELF_MACHINE_SIZEOF_JMP_SLOT PLT_ENTRY_SIZE

/* We only use RELA. */
#define ELF_MACHINE_NO_REL 1

/* Return the address of the entry point. */
#define ELF_MACHINE_START_ADDRESS(map, start) \
  DL_STATIC_FUNCTION_ADDRESS (map, start)

/* We define an initialization functions.  This is called very early in
 *    _dl_sysdep_start.  */
#define DL_PLATFORM_INIT dl_platform_init ()

static inline void __attribute__ ((unused))
dl_platform_init (void)
{
        if (GLRO(dl_platform) != NULL && *GLRO(dl_platform) == '\0')
        /* Avoid an empty string which would disturb us.  */
                GLRO(dl_platform) = NULL;
}
        
#endif /* !dl_machine_h */

/* These are only actually used where RESOLVE_MAP is defined, anyway. */
#ifdef RESOLVE_MAP

auto void __attribute__((always_inline))
elf_machine_rela (struct link_map *map, const Elf32_Rela *reloc,
                  const Elf32_Sym *sym, const struct r_found_version *version,
                  void *const reloc_addr_arg)
{
  Elf32_Addr *const reloc_addr = reloc_addr_arg;
  const Elf32_Sym *const refsym = sym;
  unsigned long const r_type = ELF32_R_TYPE (reloc->r_info);
  struct link_map *sym_map;
  Elf32_Addr value;

# if !defined RTLD_BOOTSTRAP && !defined SHARED
  /* This is defined in rtld.c, but nowhere in the static libc.a; make the
     reference weak so static programs can still link.  This declaration
     cannot be done when compiling rtld.c (i.e.  #ifdef RTLD_BOOTSTRAP)
     because rtld.c contains the common defn for _dl_rtld_map, which is
     incompatible with a weak decl in the same file.  */
  weak_extern (GL(dl_rtld_map));
# endif

  /* RESOLVE_MAP will return a null value for undefined syms, and
     non-null for all other syms.  In particular, relocs with no
     symbol (symbol index of zero), also called *ABS* relocs, will be
     resolved to MAP.  (The first entry in a symbol table is all
     zeros, and an all zero Elf32_Sym has a binding of STB_LOCAL.)
     See RESOLVE_MAP definition in elf/dl-reloc.c  */
# ifdef RTLD_BOOTSTRAP
  /* RESOLVE_MAP in rtld.c doesn't have the local sym test.  */
  sym_map = (ELF32_ST_BIND (sym->st_info) != STB_LOCAL
             ? RESOLVE_MAP (&sym, version, r_type) : map);
# else
  sym_map = RESOLVE_MAP (&sym, version, r_type);
# endif
  if (sym_map)
    {
      value = sym ? sym_map->l_addr + sym->st_value : 0;
      value += reloc->r_addend;
    }
  else
    value = 0;

  switch (r_type)
    {
    case R_PARISC_DIR32:
      /* .eh_frame can have unaligned relocs.  */
      if ((unsigned long) reloc_addr_arg & 3)
        {
          char *rel_addr = (char *) reloc_addr_arg;
          rel_addr[0] = value >> 24;
          rel_addr[1] = value >> 16;
          rel_addr[2] = value >> 8;
          rel_addr[3] = value;
          return;
        }
      break;

    case R_PARISC_PLABEL32:
      /* Easy rule: If there is a symbol and it is global, then we
         need to make a dynamic function descriptor.  Otherwise we
         have the address of a PLT slot for a local symbol which we
         know to be unique. */
      if (sym == NULL
          || sym_map == NULL
          || ELF32_ST_BIND (sym->st_info) == STB_LOCAL)
        {
          break;
        }
      /* Set bit 30 to indicate to $$dyncall that this is a PLABEL.
         We have to do this outside of the generic function descriptor
         code, since it doesn't know about our requirement for setting
         protection bits */
      value = (Elf32_Addr)((unsigned int)_dl_make_fptr (sym_map, sym, value) | 2);
      break;

    case R_PARISC_IPLT:
      if (__builtin_expect (sym_map != NULL, 1))
        {
          elf_machine_fixup_plt (NULL, sym_map, reloc, reloc_addr, value);
        } 
      else 
        {
          /* If we get here, it's a (weak) undefined sym.  */
          elf_machine_fixup_plt (NULL, map, reloc, reloc_addr, value);
        }
      return;

    case R_PARISC_COPY:
      if (__builtin_expect (sym == NULL, 0))
        /* This can happen in trace mode if an object could not be
           found.  */
        break;
      if (__builtin_expect (sym->st_size > refsym->st_size, 0)
          || (__builtin_expect (sym->st_size < refsym->st_size, 0)
              && __builtin_expect (GLRO(dl_verbose), 0)))
        {
          const char *strtab;

          strtab = (const char *) D_PTR (map, l_info[DT_STRTAB]);
          _dl_error_printf ("%s: Symbol `%s' has different size in shared object, "
                            "consider re-linking\n",
                            rtld_progname ?: "<program name unknown>",
                            strtab + refsym->st_name);
        }
      memcpy (reloc_addr_arg, (void *) value,
              MIN (sym->st_size, refsym->st_size));
      return;
      
    case R_PARISC_NONE: /* Alright, Wilbur. */
      return;

    default:
      _dl_reloc_bad_type (map, r_type, 0);
    }

  *reloc_addr = value;
}

/* hppa doesn't have an R_PARISC_RELATIVE reloc, but uses relocs with
   ELF32_R_SYM (info) == 0 for a similar purpose.  */
auto void __attribute__((always_inline))
elf_machine_rela_relative (Elf32_Addr l_addr,
                           const Elf32_Rela *reloc,
                           void *const reloc_addr_arg)
{
  unsigned long const r_type = ELF32_R_TYPE (reloc->r_info);
  Elf32_Addr *const reloc_addr = reloc_addr_arg;
  static char msgbuf[] = { "Unknown" }; 
  struct link_map map;
  Elf32_Addr value;

  value = l_addr + reloc->r_addend;

  if (ELF32_R_SYM (reloc->r_info) != 0){ 
    _dl_error_printf ("%s: In elf_machine_rela_relative "
                      "ELF32_R_SYM (reloc->r_info) != 0. Aborting.",
                      rtld_progname ?: "<program name unknown>");
    ABORT_INSTRUCTION;  /* Crash. */
  }

  switch (r_type)
    {
    case R_PARISC_DIR32:
      /* .eh_frame can have unaligned relocs.  */
      if ((unsigned long) reloc_addr_arg & 3)
        {
          char *rel_addr = (char *) reloc_addr_arg;
          rel_addr[0] = value >> 24;
          rel_addr[1] = value >> 16;
          rel_addr[2] = value >> 8;
          rel_addr[3] = value;
          return;
        }
      break;

    case R_PARISC_PLABEL32:
      break;

    case R_PARISC_IPLT: /* elf_machine_runtime_setup already set gp */
      break;

    case R_PARISC_NONE:
      return;

    default: /* Bad reloc, map unknown (really it's the current map) */
      map.l_name = msgbuf;
      _dl_reloc_bad_type (&map, r_type, 0);
      return;
    }

  *reloc_addr = value;
}

auto void __attribute__((always_inline))
elf_machine_lazy_rel (struct link_map *map,
                      Elf32_Addr l_addr, const Elf32_Rela *reloc)
{
  /* We don't have anything to do here.  elf_machine_runtime_setup has
     done all the relocs already.  */
}

#endif /* RESOLVE_MAP */