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))
setcc(int cc)51 static 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