109 lines
3.8 KiB
C
109 lines
3.8 KiB
C
/*
|
|
NetWinder Floating Point Emulator
|
|
(c) Rebel.com, 1998-1999
|
|
|
|
Direct questions, comments to Scott Bambrough <scottb@netwinder.org>
|
|
|
|
This program 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 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program 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 this program; if not, write to the Free Software
|
|
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
|
|
#ifndef __FPSR_H__
|
|
#define __FPSR_H__
|
|
|
|
/*
|
|
The FPSR is a 32 bit register consisting of 4 parts, each exactly
|
|
one byte.
|
|
|
|
SYSTEM ID
|
|
EXCEPTION TRAP ENABLE BYTE
|
|
SYSTEM CONTROL BYTE
|
|
CUMULATIVE EXCEPTION FLAGS BYTE
|
|
|
|
The FPCR is a 32 bit register consisting of bit flags.
|
|
*/
|
|
|
|
/* SYSTEM ID
|
|
------------
|
|
Note: the system id byte is read only */
|
|
|
|
typedef unsigned int FPSR; /* type for floating point status register */
|
|
typedef unsigned int FPCR; /* type for floating point control register */
|
|
|
|
#define MASK_SYSID 0xff000000
|
|
#define BIT_HARDWARE 0x80000000
|
|
#define FP_EMULATOR 0x01000000 /* System ID for emulator */
|
|
#define FP_ACCELERATOR 0x81000000 /* System ID for FPA11 */
|
|
|
|
/* EXCEPTION TRAP ENABLE BYTE
|
|
----------------------------- */
|
|
|
|
#define MASK_TRAP_ENABLE 0x00ff0000
|
|
#define MASK_TRAP_ENABLE_STRICT 0x001f0000
|
|
#define BIT_IXE 0x00100000 /* inexact exception enable */
|
|
#define BIT_UFE 0x00080000 /* underflow exception enable */
|
|
#define BIT_OFE 0x00040000 /* overflow exception enable */
|
|
#define BIT_DZE 0x00020000 /* divide by zero exception enable */
|
|
#define BIT_IOE 0x00010000 /* invalid operation exception enable */
|
|
|
|
/* SYSTEM CONTROL BYTE
|
|
---------------------- */
|
|
|
|
#define MASK_SYSTEM_CONTROL 0x0000ff00
|
|
#define MASK_TRAP_STRICT 0x00001f00
|
|
|
|
#define BIT_AC 0x00001000 /* use alternative C-flag definition
|
|
for compares */
|
|
#define BIT_EP 0x00000800 /* use expanded packed decimal format */
|
|
#define BIT_SO 0x00000400 /* select synchronous operation of FPA */
|
|
#define BIT_NE 0x00000200 /* NaN exception bit */
|
|
#define BIT_ND 0x00000100 /* no denormalized numbers bit */
|
|
|
|
/* CUMULATIVE EXCEPTION FLAGS BYTE
|
|
---------------------------------- */
|
|
|
|
#define MASK_EXCEPTION_FLAGS 0x000000ff
|
|
#define MASK_EXCEPTION_FLAGS_STRICT 0x0000001f
|
|
|
|
#define BIT_IXC 0x00000010 /* inexact exception flag */
|
|
#define BIT_UFC 0x00000008 /* underflow exception flag */
|
|
#define BIT_OFC 0x00000004 /* overfloat exception flag */
|
|
#define BIT_DZC 0x00000002 /* divide by zero exception flag */
|
|
#define BIT_IOC 0x00000001 /* invalid operation exception flag */
|
|
|
|
/* Floating Point Control Register
|
|
----------------------------------*/
|
|
|
|
#define BIT_RU 0x80000000 /* rounded up bit */
|
|
#define BIT_IE 0x10000000 /* inexact bit */
|
|
#define BIT_MO 0x08000000 /* mantissa overflow bit */
|
|
#define BIT_EO 0x04000000 /* exponent overflow bit */
|
|
#define BIT_SB 0x00000800 /* store bounce */
|
|
#define BIT_AB 0x00000400 /* arithmetic bounce */
|
|
#define BIT_RE 0x00000200 /* rounding exception */
|
|
#define BIT_DA 0x00000100 /* disable FPA */
|
|
|
|
#define MASK_OP 0x00f08010 /* AU operation code */
|
|
#define MASK_PR 0x00080080 /* AU precision */
|
|
#define MASK_S1 0x00070000 /* AU source register 1 */
|
|
#define MASK_S2 0x00000007 /* AU source register 2 */
|
|
#define MASK_DS 0x00007000 /* AU destination register */
|
|
#define MASK_RM 0x00000060 /* AU rounding mode */
|
|
#define MASK_ALU 0x9cfff2ff /* only ALU can write these bits */
|
|
#define MASK_RESET 0x00000d00 /* bits set on reset, all others cleared */
|
|
#define MASK_WFC MASK_RESET
|
|
#define MASK_RFC ~MASK_RESET
|
|
|
|
#endif
|