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/****************************************************************************
* *
* GNAT COMPILER COMPONENTS *
* *
* I N I T I A L I Z E *
* *
* C Implementation File *
* *
* Copyright (C) 1992-2009, Free Software Foundation, Inc. *
* *
* GNAT is free software; you can redistribute it and/or modify it under *
* terms of the GNU General Public License as published by the Free Soft- *
* ware Foundation; either version 3, or (at your option) any later ver- *
* sion. GNAT is distributed in the hope that it will be useful, but WITH- *
* OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY *
* or FITNESS FOR A PARTICULAR PURPOSE. *
* *
* As a special exception 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/>. *
* *
* GNAT was originally developed by the GNAT team at New York University. *
* Extensive contributions were provided by Ada Core Technologies Inc. *
* *
****************************************************************************/
/* This unit provides default implementation for __gnat_initialize ()
which is called before the elaboration of the partition. It is provided
in a separate file/object so that users can replace it easily.
The default implementation should be null on most targets. */
/* The following include is here to meet the published VxWorks requirement
that the __vxworks header appear before any other include. */
#ifdef __vxworks
#include "vxWorks.h"
#endif
#ifdef IN_RTS
#include "tconfig.h"
#include "tsystem.h"
#else
#include "config.h"
#include "system.h"
#endif
#include "raise.h"
/******************************************/
/* __gnat_initialize (NT-mingw32 Version) */
/******************************************/
#if defined (__MINGW32__)
#include <windows.h>
extern void __gnat_init_float (void);
extern void __gnat_install_SEH_handler (void *);
#ifndef RTX
/* Do not define for RTX since it is only used for creating child processes
which is not supported in RTX. */
extern void __gnat_plist_init (void);
#endif
void
__gnat_initialize (void *eh)
{
/* Initialize floating-point coprocessor. This call is needed because
the MS libraries default to 64-bit precision instead of 80-bit
precision, and we require the full precision for proper operation,
given that we have set Max_Digits etc with this in mind */
__gnat_init_float ();
/* Note that we do not activate this for the compiler itself to avoid a
bootstrap path problem. Older version of gnatbind will generate a call
to __gnat_initialize() without argument. Therefore we cannot use eh in
this case. It will be possible to remove the following #ifdef at some
point. */
#ifdef IN_RTS
/* Install the Structured Exception handler. */
if (eh)
__gnat_install_SEH_handler (eh);
#endif
}
/******************************************/
/* __gnat_initialize (init_float version) */
/******************************************/
#elif defined (__Lynx__) || defined (__FreeBSD__) || defined(__NetBSD__) \
|| defined (__OpenBSD__)
extern void __gnat_init_float (void);
void
__gnat_initialize (void *eh ATTRIBUTE_UNUSED)
{
__gnat_init_float ();
}
/***************************************/
/* __gnat_initialize (VxWorks Version) */
/***************************************/
#elif defined(__vxworks)
extern void __gnat_init_float (void);
void
__gnat_initialize (void *eh)
{
__gnat_init_float ();
/* On targets where we use the ZCX scheme, we need to register the frame
tables at load/startup time.
For applications loaded as a set of "modules", the crtstuff objects
linked in (crtbegin.o/end.o) are tailored to provide this service
automatically, a-la C++ constructor fashion, triggered by the VxWorks
loader thanks to a special variable declaration in crtbegin.o (_ctors).
Automatic de-registration is handled symmetrically, a-la C++ destructor
fashion (with a _dtors variable also in crtbegin.o) triggered by the
dynamic unloader.
Note that since the tables shall be registered against a common
data structure, libgcc should be one of the modules (vs being partially
linked against all the others at build time) and shall be loaded first.
For applications linked with the kernel, the scheme above would lead to
duplicated symbols because the VxWorks kernel build "munches" by default,
so we link against crtbeginT.o instead of crtbegin.o, which doesn't
include the special variables. We know which set of crt objects is used
thanks to a boolean indicator present in both sets (__module_has_ctors),
and directly call the appropriate function here in the not-automatic
case. We'll never unload that, so there is no de-registration to worry
about.
For whole applications loaded as a single module, we may use one scheme
or the other, except for the mixed Ada/C++ case in which the first scheme
would fail for the same reason as in the linked-with-kernel situation.
Selecting the crt set with the ctors/dtors capabilities (first scheme
above) is triggered by adding "-dynamic" to the gcc *link* command line
options. Selecting the other set is achieved by using "-static" instead.
This is a first approach, tightly synchronized with a number of GCC
configuration and crtstuff changes. We need to ensure that those changes
are there to activate this circuitry. */
#if (__GNUC__ >= 3) && (defined (_ARCH_PPC) || defined (__ppc))
{
/* The scheme described above is only useful for the actual ZCX case, and
we don't want any reference to the crt provided symbols otherwise. We
may not link with any of the crt objects in the non-ZCX case, e.g. from
documented procedures instructing the use of -nostdlib, and references
to the ctors symbols here would just remain unsatisfied.
We have no way to avoid those references in the right conditions in this
C module, because we have nothing like a IN_ZCX_RTS macro. This aspect
is then deferred to an Ada routine, which can do that based on a test
against a constant System flag value. */
extern void __gnat_vxw_setup_for_eh (void);
__gnat_vxw_setup_for_eh ();
}
#endif
}
#elif defined(_T_HPUX10) || (!defined(IN_RTS) && defined(_X_HPUX10))
/************************************************/
/* __gnat_initialize (PA-RISC HP-UX 10 Version) */
/************************************************/
extern void __main (void);
void
__gnat_initialize (void *eh ATTRIBUTE_UNUSED)
{
__main ();
}
#else
/* For all other versions of GNAT, the initialize routine and handler
installation do nothing */
/***************************************/
/* __gnat_initialize (Default Version) */
/***************************************/
void
__gnat_initialize (void *eh ATTRIBUTE_UNUSED)
{
}
#endif
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