Bochs/bochs/fpu/status_w.h

/////////////////////////////////////////////////////////////////////////
// $Id: status_w.h,v 1.13 2009-02-08 17:29:34 sshwarts Exp $
/////////////////////////////////////////////////////////////////////////
//
//   Copyright (c) 2003 Stanislav Shwartsman
//          Written by Stanislav Shwartsman [sshwarts at sourceforge net]
//
//  This library is free software; you can redistribute it and/or
//  modify it under the terms of the GNU Lesser General Public
//  License as published by the Free Software Foundation; either
//  version 2 of the License, or (at your option) any later version.
//
//  This library 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
//  Lesser General Public License for more details.
//
//  You should have received a copy of the GNU Lesser General Public
//  License along with this library; if not, write to the Free Software
//  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
//
/////////////////////////////////////////////////////////////////////////

#ifndef _STATUS_H_
#define _STATUS_H_

/* Status Word */
#define FPU_SW_Backward		(0x8000)  /* backward compatibility */
#define FPU_SW_C3	 	(0x4000)  /* condition bit 3 */
#define FPU_SW_Top		(0x3800)  /* top of stack */
#define FPU_SW_C2		(0x0400)  /* condition bit 2 */
#define FPU_SW_C1		(0x0200)  /* condition bit 1 */
#define FPU_SW_C0		(0x0100)  /* condition bit 0 */
#define FPU_SW_Summary   	(0x0080)  /* exception summary */
#define FPU_SW_Stack_Fault	(0x0040)  /* stack fault */
#define FPU_SW_Precision   	(0x0020)  /* loss of precision */
#define FPU_SW_Underflow   	(0x0010)  /* underflow */
#define FPU_SW_Overflow    	(0x0008)  /* overflow */
#define FPU_SW_Zero_Div    	(0x0004)  /* divide by zero */
#define FPU_SW_Denormal_Op   	(0x0002)  /* denormalized operand */
#define FPU_SW_Invalid    	(0x0001)  /* invalid operation */

#define FPU_SW_CC (FPU_SW_C0|FPU_SW_C1|FPU_SW_C2|FPU_SW_C3)

#define FPU_SW_Exceptions_Mask  (0x027f)  /* status word exceptions bit mask */

/* Exception flags: */
#define FPU_EX_Precision	(0x0020)  /* loss of precision */
#define FPU_EX_Underflow	(0x0010)  /* underflow */
#define FPU_EX_Overflow		(0x0008)  /* overflow */
#define FPU_EX_Zero_Div		(0x0004)  /* divide by zero */
#define FPU_EX_Denormal		(0x0002)  /* denormalized operand */
#define FPU_EX_Invalid		(0x0001)  /* invalid operation */

/* Special exceptions: */
#define FPU_EX_Stack_Overflow	(0x0041|FPU_SW_C1) 	/* stack overflow */
#define FPU_EX_Stack_Underflow	(0x0041)		/* stack underflow */

/* precision control */
#define FPU_EX_Precision_Lost_Up 	(EX_Precision | SW_C1)
#define FPU_EX_Precision_Lost_Dn        (EX_Precision)

#define setcc(cc)                               \
  FPU_PARTIAL_STATUS = (FPU_PARTIAL_STATUS & ~(FPU_SW_CC)) | ((cc) & FPU_SW_CC)

#define clear_C1() { FPU_PARTIAL_STATUS &= ~FPU_SW_C1; }
#define clear_C2() { FPU_PARTIAL_STATUS &= ~FPU_SW_C2; }

#endif