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)) 51 #define setcc(cc) ({ \ 52 partial_status &= ~(SW_C0|SW_C1|SW_C2|SW_C3); \ 53 partial_status |= (cc) & (SW_C0|SW_C1|SW_C2|SW_C3); }) 54 55 #ifdef PECULIAR_486 56 /* Default, this conveys no information, but an 80486 does it. */ 57 /* Clear the SW_C1 bit, "other bits undefined". */ 58 # define clear_C1() { partial_status &= ~SW_C1; } 59 # else 60 # define clear_C1() 61 #endif /* PECULIAR_486 */ 62 63 #endif /* __ASSEMBLY__ */ 64 65 #endif /* _STATUS_H_ */ 66