1/*---------------------------------------------------------------------------+ 2 | status_w.h | 3 | | 4 | Copyright (C) 1992,1993 | 5 | W. Metzenthen, 22 Parker St, Ormond, Vic 3163, | 6 | Australia. E-mail billm@vaxc.cc.monash.edu.au | 7 | | 8 +---------------------------------------------------------------------------*/ 9 10#ifndef _STATUS_H_ 11#define _STATUS_H_ 12 13#include "fpu_emu.h" /* for definition of PECULIAR_486 */ 14 15#ifdef __ASSEMBLY__ 16#define Const__(x) $##x 17#else 18#define Const__(x) x 19#endif 20 21#define SW_Backward Const__(0x8000) /* backward compatibility */ 22#define SW_C3 Const__(0x4000) /* condition bit 3 */ 23#define SW_Top Const__(0x3800) /* top of stack */ 24#define SW_Top_Shift Const__(11) /* shift for top of stack bits */ 25#define SW_C2 Const__(0x0400) /* condition bit 2 */ 26#define SW_C1 Const__(0x0200) /* condition bit 1 */ 27#define SW_C0 Const__(0x0100) /* condition bit 0 */ 28#define SW_Summary Const__(0x0080) /* exception summary */ 29#define SW_Stack_Fault Const__(0x0040) /* stack fault */ 30#define SW_Precision Const__(0x0020) /* loss of precision */ 31#define SW_Underflow Const__(0x0010) /* underflow */ 32#define SW_Overflow Const__(0x0008) /* overflow */ 33#define SW_Zero_Div Const__(0x0004) /* divide by zero */ 34#define SW_Denorm_Op Const__(0x0002) /* denormalized operand */ 35#define SW_Invalid Const__(0x0001) /* invalid operation */ 36 37#define SW_Exc_Mask Const__(0x27f) /* Status word exception bit mask */ 38 39#ifndef __ASSEMBLY__ 40 41#define COMP_A_gt_B 1 42#define COMP_A_eq_B 2 43#define COMP_A_lt_B 3 44#define COMP_No_Comp 4 45#define COMP_Denormal 0x20 46#define COMP_NaN 0x40 47#define COMP_SNaN 0x80 48 49#define status_word() \ 50 ((partial_status & ~SW_Top & 0xffff) | ((top << SW_Top_Shift) & SW_Top)) 51static inline void setcc(int cc) 52{ 53 partial_status &= ~(SW_C0 | SW_C1 | SW_C2 | SW_C3); 54 partial_status |= (cc) & (SW_C0 | SW_C1 | SW_C2 | SW_C3); 55} 56 57#ifdef PECULIAR_486 58 /* Default, this conveys no information, but an 80486 does it. */ 59 /* Clear the SW_C1 bit, "other bits undefined". */ 60# define clear_C1() { partial_status &= ~SW_C1; } 61# else 62# define clear_C1() 63#endif /* PECULIAR_486 */ 64 65#endif /* __ASSEMBLY__ */ 66 67#endif /* _STATUS_H_ */ 68