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Diffstat (limited to 'arch/x86/math-emu/status_w.h')
| -rw-r--r-- | arch/x86/math-emu/status_w.h | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/arch/x86/math-emu/status_w.h b/arch/x86/math-emu/status_w.h new file mode 100644 index 000000000..54a3f2269 --- /dev/null +++ b/arch/x86/math-emu/status_w.h @@ -0,0 +1,67 @@ +/*---------------------------------------------------------------------------+ + | status_w.h | + | | + | Copyright (C) 1992,1993 | + | W. Metzenthen, 22 Parker St, Ormond, Vic 3163, | + | Australia. E-mail billm@vaxc.cc.monash.edu.au | + | | + +---------------------------------------------------------------------------*/ + +#ifndef _STATUS_H_ +#define _STATUS_H_ + +#include "fpu_emu.h" /* for definition of PECULIAR_486 */ + +#ifdef __ASSEMBLY__ +#define Const__(x) $##x +#else +#define Const__(x) x +#endif + +#define SW_Backward Const__(0x8000) /* backward compatibility */ +#define SW_C3 Const__(0x4000) /* condition bit 3 */ +#define SW_Top Const__(0x3800) /* top of stack */ +#define SW_Top_Shift Const__(11) /* shift for top of stack bits */ +#define SW_C2 Const__(0x0400) /* condition bit 2 */ +#define SW_C1 Const__(0x0200) /* condition bit 1 */ +#define SW_C0 Const__(0x0100) /* condition bit 0 */ +#define SW_Summary Const__(0x0080) /* exception summary */ +#define SW_Stack_Fault Const__(0x0040) /* stack fault */ +#define SW_Precision Const__(0x0020) /* loss of precision */ +#define SW_Underflow Const__(0x0010) /* underflow */ +#define SW_Overflow Const__(0x0008) /* overflow */ +#define SW_Zero_Div Const__(0x0004) /* divide by zero */ +#define SW_Denorm_Op Const__(0x0002) /* denormalized operand */ +#define SW_Invalid Const__(0x0001) /* invalid operation */ + +#define SW_Exc_Mask Const__(0x27f) /* Status word exception bit mask */ + +#ifndef __ASSEMBLY__ + +#define COMP_A_gt_B 1 +#define COMP_A_eq_B 2 +#define COMP_A_lt_B 3 +#define COMP_No_Comp 4 +#define COMP_Denormal 0x20 +#define COMP_NaN 0x40 +#define COMP_SNaN 0x80 + +#define status_word() \ + ((partial_status & ~SW_Top & 0xffff) | ((top << SW_Top_Shift) & SW_Top)) +static inline void setcc(int cc) +{ + partial_status &= ~(SW_C0 | SW_C1 | SW_C2 | SW_C3); + partial_status |= (cc) & (SW_C0 | SW_C1 | SW_C2 | SW_C3); +} + +#ifdef PECULIAR_486 + /* Default, this conveys no information, but an 80486 does it. */ + /* Clear the SW_C1 bit, "other bits undefined". */ +# define clear_C1() { partial_status &= ~SW_C1; } +# else +# define clear_C1() +#endif /* PECULIAR_486 */ + +#endif /* __ASSEMBLY__ */ + +#endif /* _STATUS_H_ */ |