1 /****************************************************************************
3 * GNAT COMPILER COMPONENTS *
5 * I N I T I A L I Z E *
7 * C Implementation File *
9 * Copyright (C) 1992-2009, Free Software Foundation, Inc. *
11 * GNAT is free software; you can redistribute it and/or modify it under *
12 * terms of the GNU General Public License as published by the Free Soft- *
13 * ware Foundation; either version 3, or (at your option) any later ver- *
14 * sion. GNAT is distributed in the hope that it will be useful, but WITH- *
15 * OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY *
16 * or FITNESS FOR A PARTICULAR PURPOSE. *
18 * As a special exception under Section 7 of GPL version 3, you are granted *
19 * additional permissions described in the GCC Runtime Library Exception, *
20 * version 3.1, as published by the Free Software Foundation. *
22 * You should have received a copy of the GNU General Public License and *
23 * a copy of the GCC Runtime Library Exception along with this program; *
24 * see the files COPYING3 and COPYING.RUNTIME respectively. If not, see *
25 * <http://www.gnu.org/licenses/>. *
27 * GNAT was originally developed by the GNAT team at New York University. *
28 * Extensive contributions were provided by Ada Core Technologies Inc. *
30 ****************************************************************************/
32 /* This unit provides default implementation for __gnat_initialize ()
33 which is called before the elaboration of the partition. It is provided
34 in a separate file/object so that users can replace it easily.
35 The default implementation should be null on most targets. */
37 /* The following include is here to meet the published VxWorks requirement
38 that the __vxworks header appear before any other include. */
46 /* We don't have libiberty, so use malloc. */
47 #define xmalloc(S) malloc (S)
55 /******************************************/
56 /* __gnat_initialize (NT-mingw32 Version) */
57 /******************************************/
59 #if defined (__MINGW32__)
63 extern void __gnat_init_float (void);
64 extern void __gnat_install_SEH_handler (void *);
67 extern char **gnat_argv;
70 /* Do not define for RTX since it is only used for creating child processes
71 which is not supported in RTX. */
72 extern void __gnat_plist_init (void);
76 __gnat_initialize (void *eh)
78 /* Initialize floating-point coprocessor. This call is needed because
79 the MS libraries default to 64-bit precision instead of 80-bit
80 precision, and we require the full precision for proper operation,
81 given that we have set Max_Digits etc with this in mind */
84 /* Adjust gnat_argv to support Unicode characters. */
86 char arg_utf8[MAX_PATH];
91 wargv = CommandLineToArgvW (GetCommandLineW(), &wargc);
95 /* Set gnat_argv with arguments encoded in UTF-8. */
96 gnat_argv = (char **) xmalloc ((wargc + 1) * sizeof (char *));
98 for (k=0; k<wargc; k++)
100 WS2SU (arg_utf8, wargv[k], MAX_PATH);
101 gnat_argv[k] = (char *) xmalloc (strlen (arg_utf8) + 1);
102 strcpy (gnat_argv[k], arg_utf8);
110 /* Note that we do not activate this for the compiler itself to avoid a
111 bootstrap path problem. Older version of gnatbind will generate a call
112 to __gnat_initialize() without argument. Therefore we cannot use eh in
113 this case. It will be possible to remove the following #ifdef at some
116 /* Install the Structured Exception handler. */
118 __gnat_install_SEH_handler (eh);
122 /******************************************/
123 /* __gnat_initialize (init_float version) */
124 /******************************************/
126 #elif defined (__Lynx__) || defined (__FreeBSD__) || defined(__NetBSD__) \
127 || defined (__OpenBSD__)
129 extern void __gnat_init_float (void);
132 __gnat_initialize (void *eh ATTRIBUTE_UNUSED)
134 __gnat_init_float ();
137 /***************************************/
138 /* __gnat_initialize (VxWorks Version) */
139 /***************************************/
141 #elif defined(__vxworks)
143 extern void __gnat_init_float (void);
146 __gnat_initialize (void *eh)
148 __gnat_init_float ();
150 /* On targets where we use the ZCX scheme, we need to register the frame
151 tables at load/startup time.
153 For applications loaded as a set of "modules", the crtstuff objects
154 linked in (crtbegin.o/end.o) are tailored to provide this service
155 automatically, a-la C++ constructor fashion, triggered by the VxWorks
156 loader thanks to a special variable declaration in crtbegin.o (_ctors).
158 Automatic de-registration is handled symmetrically, a-la C++ destructor
159 fashion (with a _dtors variable also in crtbegin.o) triggered by the
162 Note that since the tables shall be registered against a common
163 data structure, libgcc should be one of the modules (vs being partially
164 linked against all the others at build time) and shall be loaded first.
166 For applications linked with the kernel, the scheme above would lead to
167 duplicated symbols because the VxWorks kernel build "munches" by default,
168 so we link against crtbeginT.o instead of crtbegin.o, which doesn't
169 include the special variables. We know which set of crt objects is used
170 thanks to a boolean indicator present in both sets (__module_has_ctors),
171 and directly call the appropriate function here in the not-automatic
172 case. We'll never unload that, so there is no de-registration to worry
175 For whole applications loaded as a single module, we may use one scheme
176 or the other, except for the mixed Ada/C++ case in which the first scheme
177 would fail for the same reason as in the linked-with-kernel situation.
179 Selecting the crt set with the ctors/dtors capabilities (first scheme
180 above) is triggered by adding "-dynamic" to the gcc *link* command line
181 options. Selecting the other set is achieved by using "-static" instead.
183 This is a first approach, tightly synchronized with a number of GCC
184 configuration and crtstuff changes. We need to ensure that those changes
185 are there to activate this circuitry. */
187 #if (__GNUC__ >= 3) && (defined (_ARCH_PPC) || defined (__ppc))
189 /* The scheme described above is only useful for the actual ZCX case, and
190 we don't want any reference to the crt provided symbols otherwise. We
191 may not link with any of the crt objects in the non-ZCX case, e.g. from
192 documented procedures instructing the use of -nostdlib, and references
193 to the ctors symbols here would just remain unsatisfied.
195 We have no way to avoid those references in the right conditions in this
196 C module, because we have nothing like a IN_ZCX_RTS macro. This aspect
197 is then deferred to an Ada routine, which can do that based on a test
198 against a constant System flag value. */
200 extern void __gnat_vxw_setup_for_eh (void);
201 __gnat_vxw_setup_for_eh ();
206 #elif defined(_T_HPUX10) || (!defined(IN_RTS) && defined(_X_HPUX10))
208 /************************************************/
209 /* __gnat_initialize (PA-RISC HP-UX 10 Version) */
210 /************************************************/
212 extern void __main (void);
215 __gnat_initialize (void *eh ATTRIBUTE_UNUSED)
222 /* For all other versions of GNAT, the initialize routine and handler
223 installation do nothing */
225 /***************************************/
226 /* __gnat_initialize (Default Version) */
227 /***************************************/
230 __gnat_initialize (void *eh ATTRIBUTE_UNUSED)