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//==========================================================================
//
// common/except.cxx
//
// Exception handling implementation
//
//==========================================================================
// ####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
//
// eCos is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 2 or (at your option) any later
// version.
//
// eCos is distributed in the hope that it will be useful, but WITHOUT
// 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
// along with eCos; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//
// As a special exception, if other files instantiate templates or use
// macros or inline functions from this file, or you compile this file
// and link it with other works to produce a work based on this file,
// this file does not by itself cause the resulting work to be covered by
// the GNU General Public License. However the source code for this file
// must still be made available in accordance with section (3) of the GNU
// General Public License v2.
//
// This exception does not invalidate any other reasons why a work based
// on this file might be covered by the GNU General Public License.
// -------------------------------------------
// ####ECOSGPLCOPYRIGHTEND####
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s): nickg
// Contributors: nickg, jlarmour
// Date: 1999-02-16
// Purpose: Exception handling implementation
// Description: This file contains the code that registers and delivers
// exceptions.
//
//####DESCRIPTIONEND####
//
//==========================================================================
#include <pkgconf/kernel.h>
#include <cyg/kernel/ktypes.h> // base kernel types
#include <cyg/infra/cyg_trac.h> // tracing macros
#include <cyg/infra/cyg_ass.h> // assertion macros
#include <cyg/kernel/instrmnt.h> // instrumentation
#include <cyg/kernel/except.hxx> // our header
#include <cyg/hal/hal_arch.h> // architecture definitions
#include <cyg/hal/hal_intr.h> // vector definitions
#include <cyg/kernel/thread.hxx> // thread interface
#include <cyg/kernel/thread.inl> // thread inlines
#ifdef CYGPKG_KERNEL_EXCEPTIONS
// -------------------------------------------------------------------------
// Null exception handler. This is used to capture exceptions that are
// not caught by user supplied handlers.
void
cyg_null_exception_handler(
CYG_ADDRWORD data, // user supplied data
cyg_code exception_number, // exception being raised
CYG_ADDRWORD exception_info // any exception specific info
)
{
CYG_REPORT_FUNCTION();
CYG_REPORT_FUNCARG3("data=%08x, exception=%d, info=%08x", data,
exception_number, exception_info);
CYG_TRACE1( 1, "Uncaught exception: %d", exception_number);
CYG_REPORT_RETURN();
}
// -------------------------------------------------------------------------
// Exception Controller constructor.
Cyg_Exception_Control::Cyg_Exception_Control()
{
CYG_REPORT_FUNCTION();
#ifdef CYGSEM_KERNEL_EXCEPTIONS_DECODE
for( int i = 0; i < CYGNUM_HAL_EXCEPTION_COUNT ; i++ )
exception_handler[i] = cyg_null_exception_handler,
exception_data[i] = 0;
#else
exception_handler = cyg_null_exception_handler;
exception_data = 0;
#endif
CYG_REPORT_RETURN();
}
// -------------------------------------------------------------------------
// Exception registation. Stores the handler function and data to be used
// for handling the given exception number. Where exceptions are not decoded
// only a single handler may be registered for all exceptions. This function
// also returns the old values of the exception handler and data to allow
// chaining to be implemented.
void
Cyg_Exception_Control::register_exception(
cyg_code exception_number, // exception number
cyg_exception_handler handler, // handler function
CYG_ADDRWORD data, // data argument
cyg_exception_handler **old_handler, // handler function
CYG_ADDRWORD *old_data // data argument
)
{
CYG_REPORT_FUNCTION();
CYG_REPORT_FUNCARG5("exception=%d, handler func=%08x, data=%08x, "
"space for old handler=%08x,space for old data=%08x",
exception_number, handler, data, old_handler,
old_data);
CYG_ASSERT( exception_number <= CYGNUM_HAL_EXCEPTION_MAX,
"Out of range exception number");
CYG_ASSERT( exception_number >= CYGNUM_HAL_EXCEPTION_MIN,
"Out of range exception number");
// Should we complain if there is already a registered
// handler, or should we just replace is silently?
#ifdef CYGSEM_KERNEL_EXCEPTIONS_DECODE
if( old_handler != NULL )
*old_handler = exception_handler[exception_number -
CYGNUM_HAL_EXCEPTION_MIN];
if( old_data != NULL )
*old_data = exception_data[exception_number -
CYGNUM_HAL_EXCEPTION_MIN];
exception_handler[exception_number - CYGNUM_HAL_EXCEPTION_MIN] = handler;
exception_data[exception_number - CYGNUM_HAL_EXCEPTION_MIN] = data;
#else
if( old_handler != NULL )
*old_handler = exception_handler;
if( old_data != NULL )
*old_data = exception_data;
exception_handler = handler;
exception_data = data;
#endif
CYG_REPORT_RETURN();
}
// -------------------------------------------------------------------------
// Exception deregistation. Revert the handler for the exception number
// to the default.
void
Cyg_Exception_Control::deregister_exception(
cyg_code exception_number // exception number
)
{
CYG_REPORT_FUNCTION();
CYG_REPORT_FUNCARG1("exception number=%d", exception_number);
CYG_ASSERT( exception_number <= CYGNUM_HAL_EXCEPTION_MAX,
"Out of range exception number");
CYG_ASSERT( exception_number >= CYGNUM_HAL_EXCEPTION_MIN,
"Out of range exception number");
#ifdef CYGSEM_KERNEL_EXCEPTIONS_DECODE
exception_handler[exception_number - CYGNUM_HAL_EXCEPTION_MIN] =
cyg_null_exception_handler;
exception_data[exception_number - CYGNUM_HAL_EXCEPTION_MIN] = 0;
#else
exception_handler = cyg_null_exception_handler;
exception_data = 0;
#endif
CYG_REPORT_RETURN();
}
// -------------------------------------------------------------------------
// Exception delivery. Call the appropriate exception handler.
void
Cyg_Exception_Control::deliver_exception(
cyg_code exception_number, // exception being raised
CYG_ADDRWORD exception_info // exception specific info
)
{
CYG_REPORT_FUNCTION();
CYG_REPORT_FUNCARG2("exception number=%d, exception info=%08x",
exception_number, exception_info);
cyg_exception_handler *handler = NULL;
CYG_ADDRWORD data = 0;
CYG_ASSERT( exception_number <= CYGNUM_HAL_EXCEPTION_MAX,
"Out of range exception number");
CYG_ASSERT( exception_number >= CYGNUM_HAL_EXCEPTION_MIN,
"Out of range exception number");
#ifdef CYGSEM_KERNEL_EXCEPTIONS_DECODE
handler = exception_handler[exception_number - CYGNUM_HAL_EXCEPTION_MIN];
data = exception_data[exception_number - CYGNUM_HAL_EXCEPTION_MIN];
#else
handler = exception_handler;
data = exception_data;
#endif
// The handler will always be a callable function: either the user's
// registered function or the null handler. So it is always safe to
// just go ahead and call it.
handler( data, exception_number, exception_info );
CYG_REPORT_RETURN();
}
// -------------------------------------------------------------------------
// Exception delivery function called from the HAL as a result of a
// hardware exception being raised.
externC void
cyg_hal_deliver_exception( CYG_WORD code, CYG_ADDRWORD data )
{
CYG_REPORT_FUNCTION();
Cyg_Thread::self()->deliver_exception( (cyg_code)code, data );
CYG_REPORT_RETURN();
}
// -------------------------------------------------------------------------
// Where exceptions are global, there is a single static instance of the
// exception control object. Define it here.
#ifdef CYGSEM_KERNEL_EXCEPTIONS_GLOBAL
Cyg_Exception_Control Cyg_Thread::exception_control
CYG_INIT_PRIORITY(INTERRUPTS);
#endif
// -------------------------------------------------------------------------
#endif // ifdef CYGPKG_KERNEL_EXCEPTIONS
// -------------------------------------------------------------------------
// EOF common/except.cxx
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