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 | |