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+//=================================================================
+//
+//        except1.cxx
+//
+//        Exception test 1
+//
+//=================================================================
+//####COPYRIGHTBEGIN####
+//
+// -------------------------------------------
+// The contents of this file are subject to the Cygnus eCos Public License
+// Version 1.0 (the "License"); you may not use this file except in
+// compliance with the License.  You may obtain a copy of the License at
+// http://sourceware.cygnus.com/ecos
+// 
+// Software distributed under the License is distributed on an "AS IS"
+// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See the
+// License for the specific language governing rights and limitations under
+// the License.
+// 
+// The Original Code is eCos - Embedded Cygnus Operating System, released
+// September 30, 1998.
+// 
+// The Initial Developer of the Original Code is Cygnus.  Portions created
+// by Cygnus are Copyright (C) 1998 Cygnus Solutions.  All Rights Reserved.
+// -------------------------------------------
+//
+//####COPYRIGHTEND####
+//=================================================================
+//#####DESCRIPTIONBEGIN####
+//
+// Author(s):     dsm
+// Contributors:    dsm
+// Date:          1998-06-15
+// Description:   Test basic exception functionality
+//####DESCRIPTIONEND####
+
+#include <pkgconf/kernel.h>
+
+#include <cyg/infra/testcase.h>
+
+#ifdef CYGPKG_KERNEL_EXCEPTIONS
+
+#include <cyg/kernel/sched.hxx>         // Cyg_Scheduler::start()
+#include <cyg/kernel/thread.hxx>        // Cyg_Thread
+#include <cyg/kernel/intr.hxx>          // cyg_VSR
+
+#include <cyg/hal/hal_intr.h>           // exception ranges
+
+#include <cyg/kernel/sched.inl>
+#include <cyg/kernel/thread.inl>
+
+#define NTHREADS 1
+#include "testaux.hxx"
+
+static cyg_exception_handler handler0;
+static int d0;
+
+static void handler0(CYG_ADDRWORD data, cyg_code number, CYG_ADDRWORD info)
+{
+    CYG_TEST_INFO("handler 0 called");
+    
+    CYG_TEST_CHECK((CYG_ADDRWORD)123 == data, "handler given wrong data");
+    
+    // ignore machine specific stuff
+    CYG_UNUSED_PARAM(cyg_code, number);
+    CYG_UNUSED_PARAM(CYG_ADDRWORD, info);
+
+    CYG_TEST_PASS_FINISH("Except 1 OK");
+}
+
+static void handler1(CYG_ADDRWORD data, cyg_code number, CYG_ADDRWORD info)
+{
+    CYG_TEST_INFO("handler 1 called");
+
+    CYG_TEST_CHECK((CYG_ADDRWORD)&d0 == data, "handler given wrong data");
+
+#ifdef CYGSEM_KERNEL_EXCEPTIONS_DECODE
+    CYG_TEST_CHECK(number == CYG_EXCEPTION_MAX, "handler given wrong number");
+#else
+    CYG_UNUSED_PARAM(cyg_code, number);
+#endif
+
+    CYG_TEST_CHECK((CYG_ADDRWORD)99 == info, "handler given wrong info");
+}
+
+
+// The following function attempts to cause an exception in various
+// hacky ways.  It is machine dependent what exception is generated.
+// It does reads rather than writes hoping not to corrupt anything
+// important.
+void cause_exception(void)
+{
+    int x;
+    unsigned int p=0;
+
+    do {
+        x=*(volatile int *)(p-1)/p;
+        p+=0x100000;
+    } while(p != 0);
+}
+
+static void entry0( CYG_ADDRWORD data )
+{
+    cyg_code n;
+    cyg_exception_handler *old_handler, *old_handler1;
+    CYG_ADDRWORD old_data, old_data1;
+    Cyg_Thread *p=Cyg_Thread::self();
+
+    CYG_UNUSED_PARAM(CYG_ADDRESS, data);
+
+    p->register_exception(
+        CYG_EXCEPTION_MAX, 
+        &handler1,
+        (CYG_ADDRWORD)&d0,
+        &old_handler,
+        &old_data);
+
+    p->register_exception(
+        CYG_EXCEPTION_MAX, 
+        &handler1,
+        (CYG_ADDRWORD)&d0,
+        &old_handler1,
+        &old_data1);
+    
+    CYG_TEST_CHECK(old_handler1 == &handler1,
+        "register exception: old_handler not the one previously registered");
+    CYG_TEST_CHECK(old_data1 == (CYG_ADDRWORD)&d0,
+        "register exception: old_data not those previously registered");
+
+    p->deliver_exception(CYG_EXCEPTION_MAX, (CYG_ADDRWORD)99);
+
+    CYG_TEST_INFO("handler 1 returned");
+
+    p->deregister_exception(CYG_EXCEPTION_MAX);
+    p->deregister_exception(CYG_EXCEPTION_MAX);
+
+    for(n = CYG_EXCEPTION_MIN; n <= CYG_EXCEPTION_MAX; n++) {
+        p->register_exception(
+            n,
+            handler0,
+            (CYG_ADDRWORD)123, 
+            &old_handler1,
+            &old_data1);
+    }
+
+    CYG_TEST_INFO("Attempting to provoke exception");
+
+    cause_exception();
+
+    CYG_TEST_FAIL_FINISH("Couldn't cause exception");
+}
+
+#ifdef CYG_HAL_TX39_JMR3904
+
+externC cyg_VSR __default_exception_vsr;
+cyg_VSR *old_vsr;
+
+#endif
+
+void except0_main( void )
+{
+    CYG_TEST_INIT();
+
+#ifdef CYG_HAL_TX39_JMR3904
+    
+    HAL_VSR_SET( CYG_VECTOR_LOAD_ADDRESS, __default_exception_vsr, &old_vsr );
+
+#endif
+
+    new_thread(entry0, 0);
+
+    Cyg_Scheduler::start();
+
+    CYG_TEST_FAIL_FINISH("Not reached");
+}
+externC void
+cyg_start( void )
+{
+    except0_main();
+}
+#else // def CYGPKG_KERNEL_EXCEPTIONS
+externC void
+cyg_start( void )
+{
+    CYG_TEST_INIT();
+    CYG_TEST_PASS_FINISH("NA: Exceptions disabled");
+}
+#endif // def CYGPKG_KERNEL_EXCEPTIONS
+
+// EOF except1.cxx