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glibc/csu/gmon-start.c
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/* Code to enable profiling at program startup. | |
Copyright (C) 1995-2016 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); | |
} |