2008-08-15 06:00:47 +08:00
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/*
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* The authors hereby grant permission to use, copy, modify, distribute,
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* and license this software and its documentation for any purpose, provided
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* that existing copyright notices are retained in all copies and that this
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* notice is included verbatim in any distributions. No written agreement,
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* license, or royalty fee is required for any of the authorized uses.
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* Modifications to this software may be copyrighted by their authors
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* and need not follow the licensing terms described here, provided that
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* the new terms are clearly indicated on the first page of each file where
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* they apply.
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*/
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/************************************************************************
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*
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* excause.h
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*
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2010-10-18 07:52:49 +08:00
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* (c) Copyright 2001-2003 Analog Devices, Inc. All rights reserved.
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2008-08-15 06:00:47 +08:00
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*
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************************************************************************/
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/*
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** Definitions of constants for the four user-level bits in EXCAUSE,
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** the field from SYSSTAT that is set when the EXCPT instruction is
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** invoked.
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*/
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#ifndef _EXCAUSE_H
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#define _EXCAUSE_H
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/*
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** Value 0x0 - exit program. (halt)
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** R0 => exit status.
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*/
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#define EX_EXIT_PROG 0x0
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/*
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** Value 0x1 - abnormal exit (abort)
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*/
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#define EX_ABORT_PROG 0x1
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/*
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** Value 0x2 - invoke system service.
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** R0 => command.
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** R1 => first arg
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** R2 => second arg
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*/
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#define EX_SYS_REQ 0x2
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/*
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** Available commands:
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*/
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#define EX_SYSREQ_NONE 0x00 /* Do nothing */
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#define EX_SYSREQ_REG_ISR 0x01 /* Register an interrupt handler.
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R1==EVT entry, R2==func ptr
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Returns previous entry in R0. */
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#define EX_SYSREQ_RAISE_INT 0x02 /* Cause an interrupt
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R1 = int number */
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/*
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** Values 0x3 to 0x4 currently undefined.
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*/
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/*
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** Value 0x5 - File I/O
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** R0 => first arg
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** R1 => second arg
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** R2 => third arg
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** R4 => command
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** result => R0
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*/
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#define EX_FILE_IO 0x5
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/*
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** Available commands:
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** XXX stdout/stderr are handled separately for writing.
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*/
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#define EX_FILEIO_OPEN 0x00 /* R0 => dev, R1=> path, R2=>mode */
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#define EX_FILEIO_CLOSE 0x01 /* R0=> fid */
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#define EX_FILEIO_WRITE 0x02 /* R0=>fid, R1=>data, R2=>length */
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#define EX_FILEIO_READ 0x03 /* R0=>fid, R1=>data, R2=>length */
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#define EX_FILEIO_SEEK 0x04 /* R0=>fid, R1=>offset, R2=>mode */
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#define EX_FILEIO_DUP 0x05 /* R0=>fid */
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/*
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** Values 0x6 to 0xF currently undefined.
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*/
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#endif /* _EXCAUSE_H */
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