libgcc/config/i386/cygming-crtend.c

   1 /* crtend object for windows32 targets.
   2    Copyright (C) 2007-2013 Free Software Foundation, Inc.
   3
   4    Contributed by Danny Smith <dannysmith@users.sourceforge.net>
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify it under
   9 the terms of the GNU General Public License as published by the Free
  10 Software Foundation; either version 3, or (at your option) any later
  11 version.
  12
  13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16 for more details.
  17
  18 Under Section 7 of GPL version 3, you are granted additional
  19 permissions described in the GCC Runtime Library Exception, version
  20 3.1, as published by the Free Software Foundation.
  21
  22 You should have received a copy of the GNU General Public License and
  23 a copy of the GCC Runtime Library Exception along with this program;
  24 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  25 <http://www.gnu.org/licenses/>.  */
  26
  27 /* Target machine header files require this define. */
  28 #define IN_LIBGCC2
  29
  30 /* auto-host.h is needed by cygming.h for HAVE_GAS_WEAK and here
  31    for HAVE_LD_RO_RW_SECTION_MIXING.  */
  32 #include "auto-host.h"
  33 #include "tconfig.h"
  34 #include "tsystem.h"
  35 #include "coretypes.h"
  36 #include "tm.h"
  37 #include "libgcc_tm.h"
  38 #include "unwind-dw2-fde.h"
  39
  40 #if defined(HAVE_LD_RO_RW_SECTION_MIXING)
  41 # define EH_FRAME_SECTION_CONST const
  42 #else
  43 # define EH_FRAME_SECTION_CONST
  44 #endif
  45
  46 #if DWARF2_UNWIND_INFO
  47 /* Terminate the frame unwind info section with a 0 as a sentinel;
  48    this would be the 'length' field in a real FDE.  */
  49
  50 static EH_FRAME_SECTION_CONST int __FRAME_END__[]
  51   __attribute__ ((used,  section(EH_FRAME_SECTION_NAME),
  52                   aligned(4)))
  53   = { 0 };
  54 #endif
  55
  56 #if TARGET_USE_JCR_SECTION
  57 /* Null terminate the .jcr section array.  */
  58 static void *__JCR_END__[1]
  59    __attribute__ ((used, section(JCR_SECTION_NAME),
  60                    aligned(sizeof(void *))))
  61    = { 0 };
  62 #endif
  63
  64 extern void __gcc_register_frame (void);
  65 extern void __gcc_deregister_frame (void);
  66
  67 static void register_frame_ctor (void) __attribute__ ((constructor (0)));
  68
  69 static void
  70 register_frame_ctor (void)
  71 {
  72   __gcc_register_frame ();
  73 #if DEFAULT_USE_CXA_ATEXIT
  74   /* If we use the __cxa_atexit method to register C++ dtors
  75      at object construction,  also use atexit to register eh frame
  76      info cleanup.  */
  77   atexit (__gcc_deregister_frame);
  78 #endif
  79 }
  80
  81 #if !DEFAULT_USE_CXA_ATEXIT
  82 static void deregister_frame_dtor (void) __attribute__ ((destructor (0)));
  83
  84 static void
  85 deregister_frame_dtor (void)
  86 {
  87   __gcc_deregister_frame ();
  88 }
  89 #endif