hal_syscall.c

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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
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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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//####ECOSGPLCOPYRIGHTEND####
//=============================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):   msalter
// Contributors:msalter,ysato
// Date:        2000-11-5
// Purpose:     
// Description: 
//              
//              
//
//####DESCRIPTIONEND####
//
//=============================================================================


//=============================================================================
//                            DOXYGEN FILE HEADER
//=============================================================================


//=============================================================================
//                                INCLUDES
//=============================================================================
#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

#define SYS_exit    1
#define SYS_interrupt   1000


//=============================================================================
//                                SYSCALL HANDLER
//=============================================================================
int hal_syscall_handler(void)
{
    CYG_ADDRWORD func, arg1, arg2, arg3, arg4;
    CYG_ADDRWORD err;

    func = get_register(ER0);
    arg1 = get_register(ER1);
    arg2 = get_register(ER2);
    arg3 = get_register(ER3);
    arg4 = 0;
 
    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)) {
        put_register(D0, err);
    return 0;
    }

    return SIGTRAP;
}
#endif // CYGSEM_REDBOOT_BSP_SYSCALLS
//---------------------------------------------------------------------------
//

---