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/*

 * The authors hereby grant permission to use, copy, modify, distribute,

 * and license this software and its documentation for any purpose, provided

 * that existing copyright notices are retained in all copies and that this

 * notice is included verbatim in any distributions. No written agreement,

 * license, or royalty fee is required for any of the authorized uses.

 * Modifications to this software may be copyrighted by their authors

 * and need not follow the licensing terms described here, provided that

 * the new terms are clearly indicated on the first page of each file where

 * they apply.

 */

/************************************************************************

 *

 * excause.h

 *

 * Copyright (C) 2008 Analog Devices, Inc.

 *

 ************************************************************************/

/*

** Definitions of constants for the four user-level bits in EXCAUSE,

** the field from SYSSTAT that is set when the EXCPT instruction is

** invoked.

*/

#ifndef _EXCAUSE_H

#define _EXCAUSE_H

/*

** Value 0x0 - exit program. (halt)

** R0 => exit status.

*/

#define EX_EXIT_PROG    0x0

/*

** Value 0x1 - abnormal exit (abort)

*/

#define EX_ABORT_PROG   0x1

/*

** Value 0x2 - invoke system service.

** R0 => command.

** R1 => first arg

** R2 => second arg

*/

#define EX_SYS_REQ      0x2

/*

** Available commands:

*/

#define EX_SYSREQ_NONE          0x00    /* Do nothing */

#define EX_SYSREQ_REG_ISR       0x01    /* Register an interrupt handler.

                                           R1==EVT entry, R2==func ptr

                                           Returns previous entry in R0. */

#define EX_SYSREQ_RAISE_INT     0x02    /* Cause an interrupt

                                           R1 = int number */

/*

** Values 0x3 to 0x4 currently undefined.

*/

/*

** Value 0x5 - File I/O

** R0 => first arg

** R1 => second arg

** R2 => third arg

** R4 => command

** result => R0

*/

#define EX_FILE_IO 0x5

/*

** Available commands:

** XXX stdout/stderr are handled separately for writing.

*/

#define EX_FILEIO_OPEN          0x00    /* R0 => dev, R1=> path, R2=>mode */

#define EX_FILEIO_CLOSE         0x01    /* R0=> fid */

#define EX_FILEIO_WRITE         0x02    /* R0=>fid, R1=>data, R2=>length */

#define EX_FILEIO_READ          0x03    /* R0=>fid, R1=>data, R2=>length */

#define EX_FILEIO_SEEK          0x04    /* R0=>fid, R1=>offset, R2=>mode */

#define EX_FILEIO_DUP           0x05    /* R0=>fid */

/*

** Values 0x6 to 0xF currently undefined.

*/

#endif /*  _EXCAUSE_H */