/* Code to enable profiling at program startup.

   Copyright (C) 1995-2018 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.

   In addition to the permissions in the GNU Lesser General Public

   License, the Free Software Foundation gives you unlimited

   permission to link the compiled version of this file with other

   programs, and to distribute those programs without any restriction

   coming from the use of this file.  (The GNU Lesser General Public

   License restrictions do apply in other respects; for example, they

   cover modification of the file, and distribution when not linked

   into another program.)

   Note that people who make modified versions of this file are not

   obligated to grant this special exception for their modified

   versions; it is their choice whether to do so.  The GNU Lesser

   General Public License gives permission to release a modified

   version without this exception; this exception also makes it

   possible to release a modified version which carries forward this

   exception.

   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, see

   <http://www.gnu.org/licenses/>.  */

#include <sys/types.h>

#include <sys/gmon.h>

#include <stdlib.h>

#include <unistd.h>

#define __ASSEMBLY__

#include <entry.h>

/* Beginning and end of our code segment. We cannot declare them

   as the external functions since we want the addresses of those

   labels. Taking the address of a function may have different

   meanings on different platforms. */

#ifdef ENTRY_POINT_DECL

ENTRY_POINT_DECL(extern)

#else

extern char ENTRY_POINT[];

#endif

extern char etext[];

#ifndef TEXT_START

# ifdef ENTRY_POINT_DECL

#  define TEXT_START ENTRY_POINT

# else

#  define TEXT_START &ENTRY_POINT

# endif

#endif

#ifdef GMON_START_ARRAY_SECTION

static void __gmon_start__ (void);

static void (*const gmon_start_initializer) (void)

  __attribute__ ((used, section (GMON_START_ARRAY_SECTION))) = &__gmon_start__;

static

#else

/* We cannot use the normal constructor mechanism to call

   __gmon_start__ because gcrt1.o appears before crtbegin.o in the link.

   Instead crti.o calls it specially.  */

extern void __gmon_start__ (void);

#endif

void

__gmon_start__ (void)

{

  /* Protect from being called more than once.  Since crti.o is linked

     into every shared library, each of their init functions will call us.  */

  static int called;

  if (called)

    return;

  called = 1;

  /* Start keeping profiling records.  */

  __monstartup ((u_long) TEXT_START, (u_long) &etext);

  /* Call _mcleanup before exiting; it will write out gmon.out from the

     collected data.  */

  atexit (&_mcleanup);

}