New file.

From-SVN: r130885

gcc/ada/vx_stack_info.c

+/****************************************************************************
+ *                                                                          *
+ *                         GNAT COMPILER COMPONENTS                         *
+ *                                                                          *
+ *                         V X _ S T A C K _ I N F O                        *
+ *                                                                          *
+ *                          C Implementation File                           *
+ *                                                                          *
+ *              Copyright (C) 2007, 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,  51  Franklin  Street,  Fifth  Floor, *
+ * Boston, MA 02110-1301, 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.      *
+ *                                                                          *
+ ****************************************************************************/
+
+/* VxWorks-specific file to have access to task-specific data and be able
+   to extract the stack boundaries for stack checking. */
+
+#include <taskLib.h>
+
+typedef struct
+{
+  int  size;
+  char *base;
+  char *end;
+} stack_info;
+
+/* __gnat_get_stack_info is used by s-stchop.adb only for VxWorks. This
+   procedure fills the stack information associated to the currently
+   executing task. */
+extern void __gnat_get_stack_info (stack_info *vxworks_stack_info);
+
+void
+__gnat_get_stack_info (stack_info *vxworks_stack_info)
+{
+  TASK_DESC descriptor;
+
+  /* Ask the VxWorks kernel about stack values */
+  taskInfoGet (taskIdSelf (), &descriptor);
+
+  /* Fill the stack data with the information provided by the kernel */
+  vxworks_stack_info->size = descriptor.td_stackSize;
+  vxworks_stack_info->base = descriptor.td_pStackBase;
+  vxworks_stack_info->end  = descriptor.td_pStackEnd;
+}