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Diffstat (limited to 'gcc/ada/initialize.c')
| -rw-r--r-- | gcc/ada/initialize.c | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/gcc/ada/initialize.c b/gcc/ada/initialize.c new file mode 100644 index 0000000..4963e66 --- /dev/null +++ b/gcc/ada/initialize.c @@ -0,0 +1,187 @@ +/**************************************************************************** + * * + * GNAT COMPILER COMPONENTS * + * * + * I N I T I A L I Z E * + * * + * C Implementation File * + * * + * Copyright (C) 1992-2005, 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 2, 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. See the GNU General Public License * + * for more details. You should have received a copy of the GNU General * + * Public License distributed with GNAT; see file COPYING. If not, write * + * to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, * + * MA 02111-1307, USA. * + * * + * As a special exception, if you link this file with other files to * + * produce an executable, this file does not by itself cause the resulting * + * executable to be covered by the GNU General Public License. This except- * + * ion does not however invalidate any other reasons why the executable * + * file might be covered by the GNU Public License. * + * * + * 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_plist_init (void); +extern void __gnat_install_SEH_handler (void *); + +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 (); + + /* Initialize a lock for a process handle list - see adaint.c for the + implementation of __gnat_portable_no_block_spawn, __gnat_portable_wait */ + __gnat_plist_init(); + + /* 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 (__INTERIX) || defined (__Lynx__) || \ + defined (__FreeBSD__) || defined(__NetBSD__) + +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 might be using the ZCX scheme, we need to register + the frame tables. + + For applications loaded as a set of "modules", the crtstuff objects + linked in (crtbegin/end) are tailored to provide this service a-la C++ + constructor fashion, typically triggered by the VxWorks loader. This is + achieved by way of a special variable declaration in the crt object, the + name of which has been deduced by analyzing the output of the "munching" + step documented for C++. The de-registration is handled symetrically, + a-la C++ destructor fashion and typically triggered by the dynamic + unloader. Note that since the tables shall be registered against a + common datastructure, libgcc should be one of the modules (vs beeing + 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. + To prevent those conflicts, we link against crtbegin/endS objects that + don't include the special variable and directly call the appropriate + function here. 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. + + We can differentiate by looking at the __module_has_ctors value provided + by each class of crt objects. As of today, 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 of crt objects is achieved by "-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 +} + +#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 |