Subversion Repositories openrisc

//=============================================================================

//

//      plf_stub.c

//

//      Platform specific code for GDB stub support.

//

//=============================================================================

// ####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, jskov (based on the old mn10300 hal_stub.c)

// Contributors:nickg, jskov, dhowells

// Date:        1999-02-12

// Purpose:     Platform specific code for GDB stub support.

//              

//####DESCRIPTIONEND####

//

//=============================================================================

#include <pkgconf/hal.h>

#ifdef CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS

#include <cyg/hal/hal_stub.h>

#include <cyg/hal/hal_io.h>             // HAL IO macros

#include <cyg/hal/hal_intr.h>           // HAL interrupt macros

//---------------------------------------------------------------------------

// MN10300 Serial line

// We use serial0 on AM33

#define SERIAL0_CR       ((volatile cyg_uint16 *)0xd4002000)

#define SERIAL0_ICR      ((volatile cyg_uint8 *) 0xd4002004)

#define SERIAL0_TXR      ((volatile cyg_uint8 *) 0xd4002008)

#define SERIAL0_RXR      ((volatile cyg_uint8 *) 0xd4002009)

#define SERIAL0_SR       ((volatile cyg_uint16 *)0xd400200c)

// Timer 2 provides baud rate divisor

#define TIMER0_MD       ((volatile cyg_uint8 *)0xd4003002)

#define TIMER0_BR       ((volatile cyg_uint8 *)0xd4003012)

#define TIMER0_CR       ((volatile cyg_uint8 *)0xd4003022)

#define SIO1_LSTAT_TRDY  0x20

#define SIO1_LSTAT_RRDY  0x10

//---------------------------------------------------------------------------

#ifdef CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT

// This ISR is called from the interrupt handler. This should only

// happen when there is no serial driver, so the code shouldn't mess

// anything up.

int cyg_hal_gdb_isr(cyg_uint32 vector, target_register_t pc)

{

    if ( CYGNUM_HAL_INTERRUPT_SERIAL_0_RX == vector ) {

        cyg_uint8 c;

        HAL_READ_UINT8 (SERIAL0_RXR, c);

        HAL_INTERRUPT_ACKNOWLEDGE (CYGNUM_HAL_INTERRUPT_SERIAL_0_RX);

        if( 3 == c )

        {

            // Ctrl-C: set a breakpoint at PC so GDB will display the

            // correct program context when stopping rather than the

            // interrupt handler.

            cyg_hal_gdb_interrupt (pc);

            // Interrupt handled. Don't call ISR proper. At return

            // from the VSR, execution will stop at the breakpoint

            // just set.

            return 0;

        }

    }

    // Not caused by GDB. Call ISR proper.

    return 1;

}

int hal_stb_interruptible(int state)

{

    if (state) {

        HAL_WRITE_UINT8 (SERIAL0_ICR, 0);

        HAL_INTERRUPT_ACKNOWLEDGE (CYGNUM_HAL_INTERRUPT_SERIAL_0_RX)

        HAL_INTERRUPT_UNMASK (CYGNUM_HAL_INTERRUPT_SERIAL_0_RX)

    } else {

        HAL_INTERRUPT_MASK (CYGNUM_HAL_INTERRUPT_SERIAL_0_RX)

    }

    return 0;

}

void hal_stb_init_break_irq( void )

{

    // Enable serial receive interrupts.

    HAL_WRITE_UINT8 (SERIAL0_ICR, 0);

    HAL_INTERRUPT_ACKNOWLEDGE (CYGNUM_HAL_INTERRUPT_SERIAL_0_RX)

    HAL_INTERRUPT_UNMASK (CYGNUM_HAL_INTERRUPT_SERIAL_0_RX)

    HAL_ENABLE_INTERRUPTS();

}

#endif

//-----------------------------------------------------------------------------

void hal_stb_platform_init(void)

{

    extern CYG_ADDRESS hal_virtual_vector_table[64];

    extern void init_thread_syscall( void *);

    extern void install_async_breakpoint(void *epc);

//    void (*oldvsr)(void);

    extern void __default_exception_vsr(void);

    // Ensure that the breakpoint VSR points to the default VSR. This will pass

    // it on to the stubs.

//    HAL_VSR_SET( CYGNUM_HAL_VECTOR_BREAKPOINT, __default_exception_vsr, &oldvsr );

    // Install async breakpoint handler into vector table.

    hal_virtual_vector_table[35] = (CYG_ADDRESS)install_async_breakpoint;

#if !defined(CYGPKG_KERNEL) && defined(CYGDBG_HAL_DEBUG_GDB_THREAD_SUPPORT)

    // Only include this code if we do not have a kernel. Otherwise

    // the kernel supplies the functionality for the app we are linked

    // with.

    // Prepare for application installation of thread info function in

    // vector table.

    hal_virtual_vector_table[15] = 0;

    init_thread_syscall( (void *)&hal_virtual_vector_table[15] );

#endif

}

#endif // ifdef CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS

//-----------------------------------------------------------------------------

// End of plf_stub.c