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
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