libgcc/config/frv/frvbegin.c

/* Frv initialization file linked before all user modules
   Copyright (C) 1999-2021 Free Software Foundation, Inc.
    Contributed by Red Hat, Inc.
  
   This file is part of GCC.
  
   GCC is free software ; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3, or (at your option)
   any later version.
  
   GCC 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 General Public License for more details.
  
   Under Section 7 of GPL version 3, you are granted additional
   permissions described in the GCC Runtime Library Exception, version
   3.1, as published by the Free Software Foundation.

   You should have received a copy of the GNU General Public License and
   a copy of the GCC Runtime Library Exception along with this program;
   see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
   <http://www.gnu.org/licenses/>.

   This file was originally taken from the file crtstuff.c in the
   main compiler directory, and simplified.  */

#include <stddef.h>
#include "../libgcc/unwind-dw2-fde.h"
#include "gbl-ctors.h"

/*  Declare a pointer to void function type.  */
#define STATIC static

#ifdef __FRV_UNDERSCORE__
#define UNDERSCORE "_"
#else
#define UNDERSCORE ""
#endif

#define INIT_SECTION_NEG_ONE(SECTION, FLAGS, NAME)			\
__asm__ (".section " SECTION "," FLAGS "\n\t"				\
	 ".globl   " UNDERSCORE NAME "\n\t"				\
	 ".type    " UNDERSCORE NAME ",@object\n\t"			\
	 ".p2align  2\n"						\
	 UNDERSCORE NAME ":\n\t"					\
	 ".word     -1\n\t"						\
	 ".previous")

#define INIT_SECTION(SECTION, FLAGS, NAME)				\
__asm__ (".section " SECTION "," FLAGS "\n\t"				\
	 ".globl   " UNDERSCORE NAME "\n\t"				\
	 ".type    " UNDERSCORE NAME ",@object\n\t"			\
	 ".p2align  2\n"						\
	 UNDERSCORE NAME ":\n\t"					\
	 ".previous")

/* Beginning of .ctor/.dtor sections that provides a list of constructors and
   destructors to run.  */

INIT_SECTION_NEG_ONE (".ctors", "\"a\"", "__CTOR_LIST__");
INIT_SECTION_NEG_ONE (".dtors", "\"a\"", "__DTOR_LIST__");

/* Beginning of .eh_frame section that provides all of the exception handling
   tables.  */

INIT_SECTION (".eh_frame", "\"aw\"", "__EH_FRAME_BEGIN__");

#if ! __FRV_FDPIC__
/* In FDPIC, the linker itself generates this.  */
/* Beginning of .rofixup section that provides a list of pointers that we
   need to adjust.  */

INIT_SECTION (".rofixup", "\"a\"", "__ROFIXUP_LIST__");
#endif /* __FRV_FDPIC__ */

extern void __frv_register_eh(void) __attribute__((__constructor__));
extern void __frv_deregister_eh(void) __attribute__((__destructor__));

extern func_ptr __EH_FRAME_BEGIN__[];

/* Register the exception handling table as the first constructor.  */
void
__frv_register_eh (void)
{
  static struct object object;
  if (__register_frame_info)
    __register_frame_info (__EH_FRAME_BEGIN__, &object);
}

/* Note, do not declare __{,de}register_frame_info weak as it seems
   to interfere with the pic support.  */

/* Unregister the exception handling table as a deconstructor.  */
void
__frv_deregister_eh (void)
{
  static int completed = 0;

  if (completed)
    return;

  if (__deregister_frame_info)
    __deregister_frame_info (__EH_FRAME_BEGIN__);

  completed = 1;
}

/* Run the global destructors.  */
void
__do_global_dtors (void)
{
  static func_ptr *p = __DTOR_LIST__ + 1;
  while (*p)
    {
      p++;
      (*(p-1)) ();
    }
}

/* Run the global constructors.  */
void
__do_global_ctors (void)
{
  unsigned long nptrs = (unsigned long) __CTOR_LIST__[0];
  unsigned i;

  if (nptrs == (unsigned long)-1)
    for (nptrs = 0; __CTOR_LIST__[nptrs + 1] != 0; nptrs++);

  for (i = nptrs; i >= 1; i--)
    __CTOR_LIST__[i] ();

  atexit (__do_global_dtors);
}

/* Subroutine called automatically by `main'.
   Compiling a global function named `main'
   produces an automatic call to this function at the beginning.

   For many systems, this routine calls __do_global_ctors.
   For systems which support a .init section we use the .init section
   to run __do_global_ctors, so we need not do anything here.  */

void
__main (void)
{
  /* Support recursive calls to `main': run initializers just once.  */
  static int initialized;
  if (! initialized)
    {
      initialized = 1;
      __do_global_ctors ();
    }
}