1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /*---------------------------------------------------------------------------+ 3 | status_w.h | 4 | | 5 | Copyright (C) 1992,1993 | 6 | W. Metzenthen, 22 Parker St, Ormond, Vic 3163, | 7 | Australia. E-mail billm@vaxc.cc.monash.edu.au | 8 | | 9 +---------------------------------------------------------------------------*/ 10 11 #ifndef _STATUS_H_ 12 #define _STATUS_H_ 13 14 #include "fpu_emu.h" /* for definition of PECULIAR_486 */ 15 16 #ifdef __ASSEMBLY__ 17 #define Const__(x) $##x 18 #else 19 #define Const__(x) x 20 #endif 21 22 #define SW_Backward Const__(0x8000) /* backward compatibility */ 23 #define SW_C3 Const__(0x4000) /* condition bit 3 */ 24 #define SW_Top Const__(0x3800) /* top of stack */ 25 #define SW_Top_Shift Const__(11) /* shift for top of stack bits */ 26 #define SW_C2 Const__(0x0400) /* condition bit 2 */ 27 #define SW_C1 Const__(0x0200) /* condition bit 1 */ 28 #define SW_C0 Const__(0x0100) /* condition bit 0 */ 29 #define SW_Summary Const__(0x0080) /* exception summary */ 30 #define SW_Stack_Fault Const__(0x0040) /* stack fault */ 31 #define SW_Precision Const__(0x0020) /* loss of precision */ 32 #define SW_Underflow Const__(0x0010) /* underflow */ 33 #define SW_Overflow Const__(0x0008) /* overflow */ 34 #define SW_Zero_Div Const__(0x0004) /* divide by zero */ 35 #define SW_Denorm_Op Const__(0x0002) /* denormalized operand */ 36 #define SW_Invalid Const__(0x0001) /* invalid operation */ 37 38 #define SW_Exc_Mask Const__(0x27f) /* Status word exception bit mask */ 39 40 #ifndef __ASSEMBLY__ 41 42 #define COMP_A_gt_B 1 43 #define COMP_A_eq_B 2 44 #define COMP_A_lt_B 3 45 #define COMP_No_Comp 4 46 #define COMP_Denormal 0x20 47 #define COMP_NaN 0x40 48 #define COMP_SNaN 0x80 49 50 #define status_word() \ 51 ((partial_status & ~SW_Top & 0xffff) | ((top << SW_Top_Shift) & SW_Top)) 52 static inline void setcc(int cc) 53 { 54 partial_status &= ~(SW_C0 | SW_C1 | SW_C2 | SW_C3); 55 partial_status |= (cc) & (SW_C0 | SW_C1 | SW_C2 | SW_C3); 56 } 57 58 #ifdef PECULIAR_486 59 /* Default, this conveys no information, but an 80486 does it. */ 60 /* Clear the SW_C1 bit, "other bits undefined". */ 61 # define clear_C1() { partial_status &= ~SW_C1; } 62 # else 63 # define clear_C1() 64 #endif /* PECULIAR_486 */ 65 66 #endif /* __ASSEMBLY__ */ 67 68 #endif /* _STATUS_H_ */ 69