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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
*
* (c) Copyright 2001-2003 Analog Devices, Inc. All rights reserved.
*
************************************************************************/
/*
** 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 */
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