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

//

//      hal_syscall.c

//

//      

//

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

//####ECOSGPLCOPYRIGHTBEGIN####

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

// This file is part of eCos, the Embedded Configurable Operating System.

// Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 Red Hat, 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.,

// 59 Temple Place, Suite 330, Boston, MA 02111-1307 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.

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// This exception does not invalidate any other reasons why a work based on

// this file might be covered by the GNU General Public License.

//

// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.

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

//####ECOSGPLCOPYRIGHTEND####

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

//#####DESCRIPTIONBEGIN####

//

// Author(s):   msalter

// Contributors:msalter, gthomas

// Date:        2000-11-5

// Purpose:     

// Description: 

//              

//              

//

//####DESCRIPTIONEND####

//

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

#include <pkgconf/hal.h>

#ifdef CYGPKG_REDBOOT

#include <pkgconf/redboot.h>

#endif

#if defined(CYGSEM_REDBOOT_BSP_SYSCALLS)

#include <cyg/hal/hal_stub.h>           // Our header

#include <cyg/hal/hal_arch.h>           // HAL_BREAKINST

#include <cyg/hal/hal_cache.h>          // HAL_xCACHE_x

#include <cyg/hal/hal_intr.h>           // interrupt disable/restore

#include <cyg/hal/hal_if.h>             // ROM calling interface

#include <cyg/hal/hal_misc.h>           // Helper functions

extern int __do_syscall(int func,               // syscall function number

                        long arg1, long arg2,   // up to four args.

                        long arg3, long arg4,

                        int *retval,            // syscall return value

                        int *sig);              // signal to return (or 0)

#define SYS_exit        1

#define SYS_interrupt   1000

int

hal_syscall_handler(void)

{

    int func, arg1, arg2, arg3, arg4;

    int err, res, sig;

    func = get_register(R7);

    arg1 = get_register(R8);

    arg2 = get_register(R9);

    arg3 = get_register(R10);

    arg4 = get_register(R11);

    if (func == SYS_interrupt) {

        //  A console interrupt landed us here.

        //  Invoke the debug agent so as to cause a SIGINT.

        return SIGINT;

    }

    if ((res = __do_syscall(func, arg1, arg2, arg3, arg4, &err, &sig)) != 0) {

        // Skip over trap instruction

        put_register(PC, get_register(PC)+4);

        put_register(R8, err);

        return sig;

    }

    return SIGTRAP;

}

#endif // CYGSEM_REDBOOT_BSP_SYSCALLS