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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, jskov

// Date:        2002-02-28

// Purpose:     

// Description: 

//              

//              

//

//####DESCRIPTIONEND####

//

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

#include <pkgconf/hal.h>

#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

#include <redboot.h>

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 _shnewlib_SYS_exit        1

#define _shnewlib_SYS_fork        2

#define _shnewlib_SYS_read        3

#define _shnewlib_SYS_write       4

#define _shnewlib_SYS_open        5

#define _shnewlib_SYS_close       6

#define _shnewlib_SYS_wait4       7

#define _shnewlib_SYS_creat       8

#define _shnewlib_SYS_link        9

#define _shnewlib_SYS_unlink      10

#define _shnewlib_SYS_execv       11

#define _shnewlib_SYS_chdir       12

#define _shnewlib_SYS_mknod       14

#define _shnewlib_SYS_chmod       15

#define _shnewlib_SYS_chown       16

#define _shnewlib_SYS_lseek       19

#define _shnewlib_SYS_getpid      20

#define _shnewlib_SYS_isatty      21

#define _shnewlib_SYS_fstat       22

#define _shnewlib_SYS_time        23

#define _shnewlib_SYS_ARG         24

#define _shnewlib_SYS_stat        38

#define _shnewlib_SYS_pipe        42

#define _shnewlib_SYS_execve      59

#define _shnewlib_SYS_utime       201 /* not really a system call */

#define _shnewlib_SYS_wait        202 /* nor is this */

int

hal_syscall_handler(void)

{

    int func, arg1, arg2, arg3, arg4;

    int err, sig;

    func = get_register(R4);

    arg1 = get_register(R5);

    arg2 = get_register(R6);

    arg3 = get_register(R7);

    arg4 = *(unsigned int *)(get_register(SP));

    switch (func) {

    case _shnewlib_SYS_read:

        func = SYS_read;

        break;

    case _shnewlib_SYS_write:

        func = SYS_write;

        break;

    case _shnewlib_SYS_open:

        func = SYS_open;

        break;

    case _shnewlib_SYS_close:

        func = SYS_close;

        break;

    case _shnewlib_SYS_lseek:

        func = SYS_lseek;

        break;

    case _shnewlib_SYS_utime:

        func = SYS_utime;

    default:

        return SIGTRAP;

    }

    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)) {

        // R0 is normally result register, but newlib's trap

        // code looks in R1 for the return value

        put_register(R1, err);

        return sig;

    }

    return SIGTRAP;

}