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/* Relocate a shared object and resolve its references to other loaded objects.

   Copyright (C) 1995,96,97,98,99,2000,2001 Free Software Foundation, Inc.

   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.  */

#include <errno.h>

#include <libintl.h>

#include <stdlib.h>

#include <unistd.h>

#include <ldsodefs.h>

#include <sys/mman.h>

#include <sys/param.h>

#include <sys/types.h>

#include "dynamic-link.h"

/* Statistics function.  */

unsigned long int _dl_num_cache_relocations;

void

_dl_relocate_object (struct link_map *l, struct r_scope_elem *scope[],

                     int lazy, int consider_profiling)

{

  struct textrels

  {

    caddr_t start;

    size_t len;

    int prot;

    struct textrels *next;

  } *textrels = NULL;

  /* Initialize it to make the compiler happy.  */

  const char *errstring = NULL;

  if (l->l_relocated)

    return;

  /* If DT_BIND_NOW is set relocate all references in this object.  We

     do not do this if we are profiling, of course.  */

  if (!consider_profiling

      && __builtin_expect (l->l_info[DT_BIND_NOW] != NULL, 0))

    lazy = 0;

  if (__builtin_expect (_dl_debug_mask & DL_DEBUG_RELOC, 0))

    _dl_printf ("\nrelocation processing: %s%s\n",

                l->l_name[0] ? l->l_name : _dl_argv[0], lazy ? " (lazy)" : "");

  /* DT_TEXTREL is now in level 2 and might phase out at some time.

     But we rewrite the DT_FLAGS entry to a DT_TEXTREL entry to make

     testing easier and therefore it will be available at all time.  */

  if (__builtin_expect (l->l_info[DT_TEXTREL] != NULL, 0))

    {

      /* Bletch.  We must make read-only segments writable

         long enough to relocate them.  */

      const ElfW(Phdr) *ph;

      for (ph = l->l_phdr; ph < &l->l_phdr[l->l_phnum]; ++ph)

        if (ph->p_type == PT_LOAD && (ph->p_flags & PF_W) == 0)

          {

            struct textrels *newp;

            newp = (struct textrels *) alloca (sizeof (*newp));

            newp->len = (((ph->p_vaddr + ph->p_memsz + _dl_pagesize - 1)

                          & ~(_dl_pagesize - 1))

                         - (ph->p_vaddr & ~(_dl_pagesize - 1)));

            newp->start = ((ph->p_vaddr & ~(_dl_pagesize - 1))

                           + (caddr_t) l->l_addr);

            if (mprotect (newp->start, newp->len, PROT_READ|PROT_WRITE) < 0)

              {

                errstring = N_("cannot make segment writable for relocation");

              call_error:

                _dl_signal_error (errno, l->l_name, NULL, errstring);

              }

#if (PF_R | PF_W | PF_X) == 7 && (PROT_READ | PROT_WRITE | PROT_EXEC) == 7

            newp->prot = (PF_TO_PROT

                          >> ((ph->p_flags & (PF_R | PF_W | PF_X)) * 4)) & 0xf;

#else

            newp->prot = 0;

            if (ph->p_flags & PF_R)

              newp->prot |= PROT_READ;

            if (ph->p_flags & PF_W)

              newp->prot |= PROT_WRITE;

            if (ph->p_flags & PF_X)

              newp->prot |= PROT_EXEC;

#endif

            newp->next = textrels;

            textrels = newp;

          }

    }

  {

    /* Do the actual relocation of the object's GOT and other data.  */

    /* This macro is used as a callback from the ELF_DYNAMIC_RELOCATE code.  */

#define RESOLVE_MAP(ref, version, r_type, scope) \

    (ELFW(ST_BIND) ((*ref)->st_info) != STB_LOCAL                             \

     ? ((__builtin_expect ((*ref) == map->l_lookup_cache.sym, 0)       \

         && elf_machine_type_class (r_type) == map->l_lookup_cache.type_class)\

        ? (++_dl_num_cache_relocations,                                       \

           (*ref) = map->l_lookup_cache.ret,                                  \

           map->l_lookup_cache.value)                                         \

        : ({ lookup_t _lr;                                                    \

             int _tc = elf_machine_type_class (r_type);                       \

             map->l_lookup_cache.type_class = _tc;                            \

             map->l_lookup_cache.sym = (*ref);                                \

             _lr = ((version) != NULL && (version)->hash != 0                  \

                    ? _dl_lookup_versioned_symbol (strtab + (*ref)->st_name,  \

                                                   map, (ref), scope,         \

                                                   (version), _tc, 0)          \

                    : _dl_lookup_symbol (strtab + (*ref)->st_name, map, (ref),\

                                         scope, _tc, 0));                      \

             map->l_lookup_cache.ret = (*ref);                                \

             map->l_lookup_cache.value = _lr; }))                                     \

     : map)

#define RESOLVE(ref, version, r_type, scope) \

    (ELFW(ST_BIND) ((*ref)->st_info) != STB_LOCAL                             \

     ? ((__builtin_expect ((*ref) == map->l_lookup_cache.sym, 0)       \

         && elf_machine_type_class (r_type) == map->l_lookup_cache.type_class)\

        ? (++_dl_num_cache_relocations,                                       \

           (*ref) = map->l_lookup_cache.ret,                                  \

           map->l_lookup_cache.value)                                         \

        : ({ lookup_t _lr;                                                    \

             int _tc = elf_machine_type_class (r_type);                       \

             map->l_lookup_cache.type_class = _tc;                            \

             map->l_lookup_cache.sym = (*ref);                                \

             _lr = ((version) != NULL && (version)->hash != 0                  \

                    ? _dl_lookup_versioned_symbol (strtab + (*ref)->st_name,  \

                                                   map, (ref), scope,         \

                                                   (version), _tc, 0)          \

                    : _dl_lookup_symbol (strtab + (*ref)->st_name, map, (ref),\

                                         scope, _tc, 0));                      \

             map->l_lookup_cache.ret = (*ref);                                \

             map->l_lookup_cache.value = _lr; }))                             \

     : map->l_addr)

#include "dynamic-link.h"

    ELF_DYNAMIC_RELOCATE (l, lazy, consider_profiling);

    if (__builtin_expect (consider_profiling, 0))

      {

        /* Allocate the array which will contain the already found

           relocations.  If the shared object lacks a PLT (for example

           if it only contains lead function) the l_info[DT_PLTRELSZ]

           will be NULL.  */

        if (l->l_info[DT_PLTRELSZ] == NULL)

          {

            errstring = N_("%s: profiler found no PLTREL in object %s\n");

          fatal:

            _dl_fatal_printf (errstring,

                              _dl_argv[0] ?: "<program name unknown>",

                              l->l_name);

          }

        l->l_reloc_result =

          (ElfW(Addr) *) calloc (sizeof (ElfW(Addr)),

                                 l->l_info[DT_PLTRELSZ]->d_un.d_val);

        if (l->l_reloc_result == NULL)

          {

            errstring = N_("\

%s: profiler out of memory shadowing PLTREL of %s\n");

            goto fatal;

          }

      }

  }

  /* Mark the object so we know this work has been done.  */

  l->l_relocated = 1;

  /* Undo the segment protection changes.  */

  while (__builtin_expect (textrels != NULL, 0))

    {

      if (mprotect (textrels->start, textrels->len, textrels->prot) < 0)

        {

          errstring = N_("cannot restore segment prot after reloc");

          goto call_error;

        }

      textrels = textrels->next;

    }

}

#include <machine/dl-machine.h>

void

internal_function

_dl_reloc_bad_type (struct link_map *map, unsigned int type, int plt)

{

  /* XXX We cannot translate these messages.  */

  static const char msg[2][32] = { "unexpected reloc type",

                                   "unexpected PLT reloc type" };

  char msgbuf[sizeof (msg[0])];

  strcpy (msgbuf, msg[plt]);

  _dl_signal_error (0, map->l_name, NULL, msgbuf);

}