from netbsd:

Still incomplete, but much more complete FPE from Ken Nakata
<kenn@remus.rutgers.edu>.  This emulator does not yet emulate
the following functions:
        FSINH, FETOXM1, FTANH, FATAN, FASIN, FATANH, FSIN, FTAN,
        FETOX, FTWOTOX, FTENTOX, FCOSH, FACOS, FCOS, FSINCOS
It is sufficient, however, to allow programs like df, w, and newfs,
to run to completion with correct results.
Portions of this code were based on the sparc fpe and on initial
work by gwr.

1 files changed, 76 insertions, 0 deletions

diff --git a/sys/arch/m68k/fpe/fpu_getexp.c b/sys/arch/m68k/fpe/fpu_getexp.c
new file mode 100644
index 00000000000..c2fe60531ab
--- /dev/null
+++ b/sys/arch/m68k/fpe/fpu_getexp.c
@@ -0,0 +1,76 @@
+/*	$NetBSD: fpu_getexp.c,v 1.1 1995/11/03 04:47:11 briggs Exp $	*/
+
+/*
+ * Copyright (c) 1995  Ken Nakata
+ *	All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the author nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	@(#)fpu_getexp.c	10/8/95
+ */
+
+#include <sys/types.h>
+
+#include "fpu_emulate.h"
+
+struct fpn *
+fpu_getexp(fe)
+     struct fpemu *fe;
+{
+  struct fpn *fp = &fe->fe_f2;
+
+  fe->fe_fpsr &= ~FPSR_EXCP; /* clear all exceptions */
+
+  if (fp->fp_class == FPC_INF) {
+    fp = fpu_newnan(fe);
+    fe->fe_fpsr |= FPSR_OPERR;
+  } else if (fp->fp_class == FPC_NUM) { /* a number */
+    fpu_explode(fe, &fe->fe_f3, FTYPE_LNG, &fp->fp_exp);
+    fp = &fe->fe_f3;
+  } else if (fp->fp_class == FPC_SNAN) { /* signaling NaN */
+    fe->fe_fpsr |= FPSR_SNAN;
+  } /* else if fp == zero or fp == quiet NaN, return itself */
+  return fp;
+}
+
+struct fpn *
+fpu_getman(fe)
+     struct fpemu *fe;
+{
+  struct fpn *fp = &fe->fe_f2;
+
+  fe->fe_fpsr &= ~FPSR_EXCP; /* clear all exceptions */
+
+  if (fp->fp_class == FPC_INF) {
+    fp = fpu_newnan(fe);
+    fe->fe_fpsr |= FPSR_OPERR;
+  } else if (fp->fp_class == FPC_NUM) { /* a number */
+    fp->fp_exp = 0;
+  } else if (fp->fp_class == FPC_SNAN) { /* signaling NaN */
+    fe->fe_fpsr |= FPSR_SNAN;
+  } /* else if fp == zero or fp == quiet NaN, return itself */
+  return fp;
+}
+