sysdeps/tile/dl-runtime.c

   1 /* Copyright (C) 2011 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library.  If not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 /* Like x86_64, we pass the index of the relocation and not its offset.
  20    In _dl_profile_fixup and _dl_call_pltexit we also use the index.
  21    Therefore it is wasteful to compute the offset in the trampoline
  22    just to reverse the operation immediately afterwards.  */
  23 #define reloc_offset reloc_arg * sizeof (PLTREL)
  24 #define reloc_index  reloc_arg
  25
  26 #include <elf/dl-runtime.c>
  27
  28 #include <sys/mman.h>
  29 #include <arch/sim.h>
  30
  31 /* Support notifying the simulator about new objects. */
  32 void internal_function
  33 _dl_arch_map_object (struct link_map *l)
  34 {
  35   int shift;
  36
  37 #define DLPUTC(c) __insn_mtspr(SPR_SIM_CONTROL,                         \
  38                                (SIM_CONTROL_DLOPEN                      \
  39                                 | ((c) << _SIM_CONTROL_OPERATOR_BITS)))
  40
  41   /* Write the library address in hex. */
  42   DLPUTC ('0');
  43   DLPUTC ('x');
  44   for (shift = (int) sizeof (unsigned long) * 8 - 4; shift >= 0; shift -= 4)
  45     DLPUTC ("0123456789abcdef"[(l->l_map_start >> shift) & 0xF]);
  46   DLPUTC (':');
  47
  48   /* Write the library path, including the terminating '\0'. */
  49   for (size_t i = 0;; i++)
  50     {
  51       DLPUTC (l->l_name[i]);
  52       if (l->l_name[i] == '\0')
  53         break;
  54     }
  55 #undef DLPUTC
  56 }
  57
  58 /* Support notifying the simulator about removed objects prior to munmap(). */
  59 void internal_function
  60 _dl_unmap (struct link_map *l)
  61 {
  62   int shift;
  63
  64 #define DLPUTC(c) __insn_mtspr(SPR_SIM_CONTROL,                         \
  65                                (SIM_CONTROL_DLCLOSE                     \
  66                                 | ((c) << _SIM_CONTROL_OPERATOR_BITS)))
  67
  68   /* Write the library address in hex. */
  69   DLPUTC ('0');
  70   DLPUTC ('x');
  71   for (shift = (int) sizeof (unsigned long) * 8 - 4; shift >= 0; shift -= 4)
  72     DLPUTC ("0123456789abcdef"[(l->l_map_start >> shift) & 0xF]);
  73   DLPUTC ('\0');
  74 #undef DLPUTC
  75
  76   __munmap ((void *) l->l_map_start, l->l_map_end - l->l_map_start);
  77 }
  78
  79 #define DL_UNMAP(map) _dl_unmap (map)