68 lines
2.5 KiB
C
68 lines
2.5 KiB
C
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/*---------------------------------------------------------------------------+
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| status_w.h |
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| Copyright (C) 1992,1993 |
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| W. Metzenthen, 22 Parker St, Ormond, Vic 3163, |
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| Australia. E-mail billm@vaxc.cc.monash.edu.au |
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+---------------------------------------------------------------------------*/
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#ifndef _STATUS_H_
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#define _STATUS_H_
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#include "fpu_emu.h" /* for definition of PECULIAR_486 */
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#ifdef __ASSEMBLY__
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#define Const__(x) $##x
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#else
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#define Const__(x) x
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#endif
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#define SW_Backward Const__(0x8000) /* backward compatibility */
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#define SW_C3 Const__(0x4000) /* condition bit 3 */
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#define SW_Top Const__(0x3800) /* top of stack */
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#define SW_Top_Shift Const__(11) /* shift for top of stack bits */
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#define SW_C2 Const__(0x0400) /* condition bit 2 */
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#define SW_C1 Const__(0x0200) /* condition bit 1 */
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#define SW_C0 Const__(0x0100) /* condition bit 0 */
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#define SW_Summary Const__(0x0080) /* exception summary */
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#define SW_Stack_Fault Const__(0x0040) /* stack fault */
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#define SW_Precision Const__(0x0020) /* loss of precision */
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#define SW_Underflow Const__(0x0010) /* underflow */
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#define SW_Overflow Const__(0x0008) /* overflow */
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#define SW_Zero_Div Const__(0x0004) /* divide by zero */
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#define SW_Denorm_Op Const__(0x0002) /* denormalized operand */
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#define SW_Invalid Const__(0x0001) /* invalid operation */
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#define SW_Exc_Mask Const__(0x27f) /* Status word exception bit mask */
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#ifndef __ASSEMBLY__
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#define COMP_A_gt_B 1
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#define COMP_A_eq_B 2
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#define COMP_A_lt_B 3
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#define COMP_No_Comp 4
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#define COMP_Denormal 0x20
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#define COMP_NaN 0x40
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#define COMP_SNaN 0x80
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#define status_word() \
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((partial_status & ~SW_Top & 0xffff) | ((top << SW_Top_Shift) & SW_Top))
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static inline void setcc(int cc)
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{
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partial_status &= ~(SW_C0 | SW_C1 | SW_C2 | SW_C3);
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partial_status |= (cc) & (SW_C0 | SW_C1 | SW_C2 | SW_C3);
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}
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#ifdef PECULIAR_486
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/* Default, this conveys no information, but an 80486 does it. */
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/* Clear the SW_C1 bit, "other bits undefined". */
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# define clear_C1() { partial_status &= ~SW_C1; }
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# else
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# define clear_C1()
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#endif /* PECULIAR_486 */
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#endif /* __ASSEMBLY__ */
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#endif /* _STATUS_H_ */
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