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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.

//

// 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.

// at http://sources.redhat.com/ecos/ecos-license/

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

//####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;

    int retreg;

    target_register_t sr = get_register(REG_SR);

    if ((sr & CYGARC_SR_PM) == 0 || (sr & CYGARC_SR_BS) == 0) {

        // bank zero regs

        func = get_register(REG_B0R0);

        arg1 = get_register(REG_B0R1);

        arg2 = get_register(REG_B0R2);

        arg3 = get_register(REG_B0R3);

        arg4 = 0;

        retreg = REG_B0R0;

    } else {

        func = get_register(REG_B1R0);

        arg1 = get_register(REG_B1R1);

        arg2 = get_register(REG_B1R2);

        arg3 = get_register(REG_B1R3);

        retreg = REG_B1R0;

    }

    set_pc(get_pc()+2);

    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(retreg, err);

        return (int)sig;

    }

    return SIGTRAP;

}

#endif // CYGSEM_REDBOOT_BSP_SYSCALLS