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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /arch/x86/math-emu/status_w.h
Initial import
Diffstat (limited to 'arch/x86/math-emu/status_w.h')
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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
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+++ b/arch/x86/math-emu/status_w.h
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+/*---------------------------------------------------------------------------+
+ | 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_ */