libgcc/config/frv/frvbegin.c

   1 /* Frv initialization file linked before all user modules
   2    Copyright (C) 1999-2013 Free Software Foundation, Inc.
   3     Contributed by Red Hat, Inc.
   4
   5    This file is part of GCC.
   6
   7    GCC is free software ; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3, or (at your option)
  10    any later version.
  11
  12    GCC is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY ; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    Under Section 7 of GPL version 3, you are granted additional
  18    permissions described in the GCC Runtime Library Exception, version
  19    3.1, as published by the Free Software Foundation.
  20
  21    You should have received a copy of the GNU General Public License and
  22    a copy of the GCC Runtime Library Exception along with this program;
  23    see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  24    <http://www.gnu.org/licenses/>.
  25
  26    This file was originally taken from the file crtstuff.c in the
  27    main compiler directory, and simplified.  */
  28
  29 #include "defaults.h"
  30 #include <stddef.h>
  31 #include "../libgcc/unwind-dw2-fde.h"
  32 #include "gbl-ctors.h"
  33
  34 /*  Declare a pointer to void function type.  */
  35 #define STATIC static
  36
  37 #ifdef __FRV_UNDERSCORE__
  38 #define UNDERSCORE "_"
  39 #else
  40 #define UNDERSCORE ""
  41 #endif
  42
  43 #define INIT_SECTION_NEG_ONE(SECTION, FLAGS, NAME)                      \
  44 __asm__ (".section " SECTION "," FLAGS "\n\t"                           \
  45          ".globl   " UNDERSCORE NAME "\n\t"                             \
  46          ".type    " UNDERSCORE NAME ",@object\n\t"                     \
  47          ".p2align  2\n"                                                \
  48          UNDERSCORE NAME ":\n\t"                                        \
  49          ".word     -1\n\t"                                             \
  50          ".previous")
  51
  52 #define INIT_SECTION(SECTION, FLAGS, NAME)                              \
  53 __asm__ (".section " SECTION "," FLAGS "\n\t"                           \
  54          ".globl   " UNDERSCORE NAME "\n\t"                             \
  55          ".type    " UNDERSCORE NAME ",@object\n\t"                     \
  56          ".p2align  2\n"                                                \
  57          UNDERSCORE NAME ":\n\t"                                        \
  58          ".previous")
  59
  60 /* Beginning of .ctor/.dtor sections that provides a list of constructors and
  61    destructors to run.  */
  62
  63 INIT_SECTION_NEG_ONE (".ctors", "\"aw\"", "__CTOR_LIST__");
  64 INIT_SECTION_NEG_ONE (".dtors", "\"aw\"", "__DTOR_LIST__");
  65
  66 /* Beginning of .eh_frame section that provides all of the exception handling
  67    tables.  */
  68
  69 INIT_SECTION (".eh_frame", "\"aw\"", "__EH_FRAME_BEGIN__");
  70
  71 #if ! __FRV_FDPIC__
  72 /* In FDPIC, the linker itself generates this.  */
  73 /* Beginning of .rofixup section that provides a list of pointers that we
  74    need to adjust.  */
  75
  76 INIT_SECTION (".rofixup", "\"a\"", "__ROFIXUP_LIST__");
  77 #endif /* __FRV_FDPIC__ */
  78
  79 extern void __frv_register_eh(void) __attribute__((__constructor__));
  80 extern void __frv_deregister_eh(void) __attribute__((__destructor__));
  81
  82 extern func_ptr __EH_FRAME_BEGIN__[];
  83
  84 /* Register the exception handling table as the first constructor.  */
  85 void
  86 __frv_register_eh (void)
  87 {
  88   static struct object object;
  89   if (__register_frame_info)
  90     __register_frame_info (__EH_FRAME_BEGIN__, &object);
  91 }
  92
  93 /* Note, do not declare __{,de}register_frame_info weak as it seems
  94    to interfere with the pic support.  */
  95
  96 /* Unregister the exception handling table as a deconstructor.  */
  97 void
  98 __frv_deregister_eh (void)
  99 {
 100   static int completed = 0;
 101
 102   if (completed)
 103     return;
 104
 105   if (__deregister_frame_info)
 106     __deregister_frame_info (__EH_FRAME_BEGIN__);
 107
 108   completed = 1;
 109 }
 110
 111 /* Run the global destructors.  */
 112 void
 113 __do_global_dtors (void)
 114 {
 115   static func_ptr *p = __DTOR_LIST__ + 1;
 116   while (*p)
 117     {
 118       p++;
 119       (*(p-1)) ();
 120     }
 121 }
 122
 123 /* Run the global constructors.  */
 124 void
 125 __do_global_ctors (void)
 126 {
 127   unsigned long nptrs = (unsigned long) __CTOR_LIST__[0];
 128   unsigned i;
 129
 130   if (nptrs == (unsigned long)-1)
 131     for (nptrs = 0; __CTOR_LIST__[nptrs + 1] != 0; nptrs++);
 132
 133   for (i = nptrs; i >= 1; i--)
 134     __CTOR_LIST__[i] ();
 135
 136   atexit (__do_global_dtors);
 137 }
 138
 139 /* Subroutine called automatically by `main'.
 140    Compiling a global function named `main'
 141    produces an automatic call to this function at the beginning.
 142
 143    For many systems, this routine calls __do_global_ctors.
 144    For systems which support a .init section we use the .init section
 145    to run __do_global_ctors, so we need not do anything here.  */
 146
 147 void
 148 __main (void)
 149 {
 150   /* Support recursive calls to `main': run initializers just once.  */
 151   static int initialized;
 152   if (! initialized)
 153     {
 154       initialized = 1;
 155       __do_global_ctors ();
 156     }
 157 }