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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

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//

// eCos is distributed in the hope that it will be useful, but WITHOUT ANY

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// 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

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// License. However the source code for this file must still be made available

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

//####ECOSGPLCOPYRIGHTEND####

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

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

//

// Author(s):   msalter

// Contributors:msalter

// 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 CYG_ADDRWORD __do_syscall(CYG_ADDRWORD func,             // syscall function number

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

                        CYG_ADDRWORD arg3, CYG_ADDRWORD arg4,

                        CYG_ADDRWORD *retval,           // syscall return value

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

#define SYS_exit        1

#define SYS_interrupt   1000

int

hal_syscall_handler(void)

{

    CYG_ADDRWORD func, arg1, arg2, arg3, arg4;

    CYG_ADDRWORD err, sig;

    func = get_register(REG_A0);

    arg1 = get_register(REG_A1);

    arg2 = get_register(REG_A2);

    arg3 = get_register(REG_A3);

    arg4 = 0;

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

    if (func == SYS_interrupt) {

        //  A console interrupt landed us here.

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

        return SIGINT;

    }

    if (__do_syscall(func, arg1, arg2, arg3, arg4, &err, &sig)) {

        put_register(REG_V0, err);

        return (int)sig;

    }

    return SIGTRAP;

}

#endif // CYGSEM_REDBOOT_BSP_SYSCALLS