1 files changed, 115 insertions, 0 deletions
diff --git a/arch/x86/math-emu/fpu_tags.c b/arch/x86/math-emu/fpu_tags.c
new file mode 100644
index 000000000..d9c657cd7
--- /dev/null
+++ b/arch/x86/math-emu/fpu_tags.c
@@ -0,0 +1,115 @@
+/*---------------------------------------------------------------------------+
+ |  fpu_tags.c                                                               |
+ |                                                                           |
+ |  Set FPU register tags.                                                   |
+ |                                                                           |
+ | Copyright (C) 1997                                                        |
+ |                  W. Metzenthen, 22 Parker St, Ormond, Vic 3163, Australia |
+ |                  E-mail   billm@jacobi.maths.monash.edu.au                |
+ |                                                                           |
+ |                                                                           |
+ +---------------------------------------------------------------------------*/
+
+#include "fpu_emu.h"
+#include "fpu_system.h"
+#include "exception.h"
+
+void FPU_pop(void)
+{
+	fpu_tag_word |= 3 << ((top & 7) * 2);
+	top++;
+}
+
+int FPU_gettag0(void)
+{
+	return (fpu_tag_word >> ((top & 7) * 2)) & 3;
+}
+
+int FPU_gettagi(int stnr)
+{
+	return (fpu_tag_word >> (((top + stnr) & 7) * 2)) & 3;
+}
+
+int FPU_gettag(int regnr)
+{
+	return (fpu_tag_word >> ((regnr & 7) * 2)) & 3;
+}
+
+void FPU_settag0(int tag)
+{
+	int regnr = top;
+	regnr &= 7;
+	fpu_tag_word &= ~(3 << (regnr * 2));
+	fpu_tag_word |= (tag & 3) << (regnr * 2);
+}
+
+void FPU_settagi(int stnr, int tag)
+{
+	int regnr = stnr + top;
+	regnr &= 7;
+	fpu_tag_word &= ~(3 << (regnr * 2));
+	fpu_tag_word |= (tag & 3) << (regnr * 2);
+}
+
+void FPU_settag(int regnr, int tag)
+{
+	regnr &= 7;
+	fpu_tag_word &= ~(3 << (regnr * 2));
+	fpu_tag_word |= (tag & 3) << (regnr * 2);
+}
+
+int FPU_Special(FPU_REG const *ptr)
+{
+	int exp = exponent(ptr);
+
+	if (exp == EXP_BIAS + EXP_UNDER)
+		return TW_Denormal;
+	else if (exp != EXP_BIAS + EXP_OVER)
+		return TW_NaN;
+	else if ((ptr->sigh == 0x80000000) && (ptr->sigl == 0))
+		return TW_Infinity;
+	return TW_NaN;
+}
+
+int isNaN(FPU_REG const *ptr)
+{
+	return ((exponent(ptr) == EXP_BIAS + EXP_OVER)
+		&& !((ptr->sigh == 0x80000000) && (ptr->sigl == 0)));
+}
+
+int FPU_empty_i(int stnr)
+{
+	int regnr = (top + stnr) & 7;
+
+	return ((fpu_tag_word >> (regnr * 2)) & 3) == TAG_Empty;
+}
+
+int FPU_stackoverflow(FPU_REG ** st_new_ptr)
+{
+	*st_new_ptr = &st(-1);
+
+	return ((fpu_tag_word >> (((top - 1) & 7) * 2)) & 3) != TAG_Empty;
+}
+
+void FPU_copy_to_regi(FPU_REG const *r, u_char tag, int stnr)
+{
+	reg_copy(r, &st(stnr));
+	FPU_settagi(stnr, tag);
+}
+
+void FPU_copy_to_reg1(FPU_REG const *r, u_char tag)
+{
+	reg_copy(r, &st(1));
+	FPU_settagi(1, tag);
+}
+
+void FPU_copy_to_reg0(FPU_REG const *r, u_char tag)
+{
+	int regnr = top;
+	regnr &= 7;
+
+	reg_copy(r, &st(0));
+
+	fpu_tag_word &= ~(3 << (regnr * 2));
+	fpu_tag_word |= (tag & 3) << (regnr * 2);
+}