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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 Free Software Foundation, 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.                                                                 

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// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License    

// for more details.                                                        

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// You should have received a copy of the GNU General Public License        

// along with eCos; if not, write to the Free Software Foundation, Inc.,    

// 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.            

//

// As a special exception, if other files instantiate templates or use      

// macros or inline functions from this file, or you compile this file      

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// this file does not by itself cause the resulting work to be covered by   

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// General Public License v2.                                               

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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)

// These are required by the ANSI C part of newlib (excluding system() of

// course).

#define SYS_exit        1

#define SYS_open        2

#define SYS_close       3

#define SYS_read        4

#define SYS_write       5

#define SYS_lseek       6

#define SYS_unlink      7

#define SYS_getpid      8

#define SYS_kill        9

#define SYS_fstat       10

//#define SYS_sbrk      11 - not currently a system call, but reserved.

// ARGV support.

#define SYS_argvlen     12

#define SYS_argv        13

// These are extras added for one reason or another.

#define SYS_chdir       14

#define SYS_stat        15

#define SYS_chmod       16

#define SYS_utime       17

#define SYS_time        18

#define SYS_interrupt   1000

#define SYS_meminfo     1001

int

hal_syscall_handler(void)

{

    int func, lret = 0;

    unsigned short *sp = (unsigned short *)get_register(REG_SP);

    CYG_ADDRWORD arg1, arg2, arg3, arg4;

    long err, sig;

    // Shift this right because GDB wants 16-bit register values

    // to be left-justified in a 32-bit field. Yuck.

    func = get_register(REG_R0) >> 16;

    arg1 = get_register(REG_A8);

    arg2 = get_register(REG_A9);

    arg3 = get_register(REG_A10);

    arg4 = get_register(REG_A11);

    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_R2, ((err < 0) ? -err : 0) << 16);

        put_register(REG_A8, err);

        return (int)sig;

    }

    return SIGTRAP;

}

#endif // CYGSEM_REDBOOT_BSP_SYSCALLS