Kernel FPU emulator, chain saw edition.

1 files changed, 87 insertions, 0 deletions

diff --git a/arch/mips/math-emu/ieee754sp.h b/arch/mips/math-emu/ieee754sp.h
new file mode 100644
index 000000000..2ff769dcf
--- /dev/null
+++ b/arch/mips/math-emu/ieee754sp.h
@@ -0,0 +1,87 @@
+/* 
+ * IEEE754 floating point
+ * double precision internal header file
+ */
+/*
+ * MIPS floating point support
+ * Copyright (C) 1994-2000 Algorithmics Ltd.  All rights reserved.
+ * http://www.algor.co.uk
+ *
+ * ########################################################################
+ *
+ *  This program is free software; you can distribute it and/or modify it
+ *  under the terms of the GNU General Public License (Version 2) as
+ *  published by the Free Software Foundation.
+ *
+ *  This program is distributed in the hope it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
+ *
+ * ########################################################################
+ */
+
+
+#include "ieee754int.h"
+
+/* 3bit extended single precision sticky right shift */
+#define SPXSRSXn(rs) \
+  (xe += rs, \
+   xm = (rs > (SP_MBITS+3))?1:((xm) >> (rs)) | ((xm) << (32-(rs)) != 0))
+
+#define SPXSRSX1() \
+  (xe++, (xm = (xm >> 1) | (xm & 1)))
+
+#define SPXSRSYn(rs) \
+   (ye+=rs, \
+    ym = (rs > (SP_MBITS+3))?1:((ym) >> (rs)) | ((ym) << (32-(rs)) != 0))
+
+#define SPXSRSY1() \
+   (ye++, (ym = (ym >> 1) | (ym & 1)))
+
+/* convert denormal to normalized with extended exponent */
+#define SPDNORMx(m,e) \
+  while( (m >> SP_MBITS) == 0) { m <<= 1; e--; }
+#define SPDNORMX	SPDNORMx(xm,xe)
+#define SPDNORMY	SPDNORMx(ym,ye)
+
+static __inline ieee754sp buildsp(int s, int bx, unsigned m)
+{
+	ieee754sp r;
+
+	assert((s) == 0 || (s) == 1);
+	assert((bx) >= SP_EMIN - 1 + SP_EBIAS
+	       && (bx) <= SP_EMAX + 1 + SP_EBIAS);
+	assert(((m) >> SP_MBITS) == 0);
+
+	r.parts.sign = s;
+	r.parts.bexp = bx;
+	r.parts.mant = m;
+
+	return r;
+}
+
+extern int ieee754sp_isnan(ieee754sp);
+extern int ieee754sp_issnan(ieee754sp);
+extern int ieee754si_xcpt(int, const char *, ...);
+extern long long ieee754di_xcpt(long long, const char *, ...);
+extern ieee754sp ieee754sp_xcpt(ieee754sp, const char *, ...);
+extern ieee754sp ieee754sp_nanxcpt(ieee754sp, const char *, ...);
+extern ieee754sp ieee754sp_bestnan(ieee754sp, ieee754sp);
+extern ieee754sp ieee754sp_format(int, int, unsigned);
+
+
+#define SPNORMRET2(s,e,m,name,a0,a1) \
+{ \
+    ieee754sp V = ieee754sp_format(s,e,m); \
+    if(TSTX()) \
+      return ieee754sp_xcpt(V,name,a0,a1); \
+    else \
+      return V; \
+}
+
+#define SPNORMRET1(s,e,m,name,a0)  SPNORMRET2(s,e,m,name,a0,a0)