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/* Special .init and .fini section support.
Copyright (C) 1995, 1996, 1997, 2000 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.)
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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
/* This file is compiled into assembly code which is then munged by a sed
script into two files: crti.s and crtn.s.
* crti.s puts a function prologue at the beginning of the
.init and .fini sections and defines global symbols for
those addresses, so they can be called as functions.
* crtn.s puts the corresponding function epilogues
in the .init and .fini sections. */
#include <features.h>
#undef GMON_SUPPORT
/* We use embedded asm for .section unconditionally, as this makes it
easier to insert the necessary directives into crtn.S. */
#define SECTION(x) asm (".section " x );
/* Declare symbols as hidden. Hidden symbols are only seen by
* the link editor and not by the dynamic loader. */
#ifdef __HAVE_DOT_HIDDEN__
# define HIDDEN(func) asm (".hidden " #func );
#else
# define HIDDEN(func)
#endif
#if defined(__sh__)
/* The macro insert this sh specific stuff:
@_SH_GLB_BEGINS
bra 1f
nop
ALIGN
@func_SH_GLB_LABEL
1:
@_SH_GLB_ENDS
*/
#define GLB_STUFF(func) asm ("\n/*@_SH_GLB_BEGINS*/"); \
asm ("\n\tbra\t1f\n\tnop\n\tALIGN\n/*@" #func"_SH_GLB_LABEL*/\n1:"); \
asm ("\n/*@_SH_GLB_ENDS*/");
#else
#define GLB_STUFF(func)
#endif
/* The initial common code ends here. */
asm ("\n/*@HEADER_ENDS*/");
/* To determine whether we need .end and .align: */
//asm ("\n/*@TESTS_BEGIN*/");
extern void dummy (void (*foo) (void));
void
dummy (void (*foo) (void))
{
if (foo)
(*foo) ();
}
//asm ("\n/*@TESTS_END*/");
/* The beginning of _init: */
asm ("\n/*@_init_PROLOG_BEGINS*/");
#ifdef GMON_SUPPORT
static void
call_gmon_start(void)
{
extern void __gmon_start__ (void) __attribute__ ((weak)); /*weak_extern (__gmon_start__);*/
void (*gmon_start) (void) = __gmon_start__;
if (gmon_start)
gmon_start ();
}
#endif
SECTION (".init")
HIDDEN(_init)
extern void i_am_not_a_leaf (void);
extern void _init (void);
void _init (void)
{
#ifdef GMON_SUPPORT
/* We cannot use the normal constructor mechanism in gcrt1.o because it
appears before crtbegin.o in the link, so the header elt of .ctors
would come after the elt for __gmon_start__. One approach is for
gcrt1.o to reference a symbol which would be defined by some library
module which has a constructor; but then user code's constructors
would come first, and not be profiled. */
call_gmon_start ();
#else
asm ("\n/*@_init_PROLOG_PAUSES*/");
{
/* Let GCC know that _init is not a leaf function by having a dummy
* function call here. We arrange for this call to be omitted from
* either crt file. */
i_am_not_a_leaf ();
}
asm ("\n/*@_init_PROLOG_UNPAUSES*/");
#endif
GLB_STUFF(_init)
asm ("ALIGN");
asm("END_INIT");
/* Now the epilog. */
asm ("\n/*@_init_PROLOG_ENDS*/");
asm ("\n/*@_init_EPILOG_BEGINS*/");
}
/* End of the _init epilog, beginning of the _fini prolog. */
asm ("\n/*@_init_EPILOG_ENDS*/");
asm ("\n/*@_fini_PROLOG_BEGINS*/");
SECTION (".fini")
HIDDEN(_fini)
extern void i_am_not_a_leaf2 (void);
extern void _fini (void);
void _fini (void)
{
/* End of the _fini prolog. */
GLB_STUFF(_fini)
asm ("ALIGN");
asm ("END_FINI");
asm ("\n/*@_fini_PROLOG_ENDS*/");
{
/* Let GCC know that _fini is not a leaf function by having a dummy
function call here. We arrange for this call to be omitted from
either crt file. */
i_am_not_a_leaf2 ();
}
/* Beginning of the _fini epilog. */
asm ("\n/*@_fini_EPILOG_BEGINS*/");
}
/* End of the _fini epilog. Any further generated assembly (e.g. .ident)
is shared between both crt files. */
asm ("\n/*@_fini_EPILOG_ENDS*/");
asm ("\n/*@TRAILER_BEGINS*/");
/* End of file. */
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