added and modified libm to support SuperH architecture
diff --git a/libm/sh/fenv.h b/libm/sh/fenv.h
new file mode 100644
index 0000000..e872f47
--- /dev/null
+++ b/libm/sh/fenv.h
@@ -0,0 +1,240 @@
+/*
+ * Copyright (C) 2009 Android Open Source Project, All rights reserved.
+ * Derived from "bionic/libm/arm/fenv.h"
+ * Copyright (c) 2004-2005 David Schultz <das@FreeBSD.ORG>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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
+ * COPYRIGHT OWNER 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.
+ */
+
+#ifndef _FENV_H_
+#define _FENV_H_
+
+#include <stdio.h>
+#include <sys/types.h>
+
+typedef uint32_t fenv_t;
+typedef uint32_t fexcept_t;
+
+/* Exception flags */
+#define FE_INVALID 0x0010
+#define FE_DIVBYZERO 0x0008
+#define FE_OVERFLOW 0x0004
+#define FE_UNDERFLOW 0x0002
+#define FE_INEXACT 0x0001
+#define FE_ALL_EXCEPT (FE_DIVBYZERO | FE_INEXACT | \
+ FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW)
+
+/* Rounding modes */
+#define FE_TONEAREST 0x0000
+#define FE_TOWARDZERO 0x0001
+#define FE_UPWARD 0x0002 /* not supporetd */
+#define FE_DOWNWARD 0x0003 /* not supporetd */
+#define _ROUND_MASK (FE_TONEAREST | FE_DOWNWARD | \
+ FE_UPWARD | FE_TOWARDZERO)
+
+/* bit shift for FPSCR mapping */
+#define _FPUE_CAUSE_SHIFT 12
+#define _FPUE_ENABLE_SHIFT 17
+#define _FPUE_FLAG_SHIFT 2
+
+/* bit shifters */
+#define _FPUE_CAUSE(_EXCS) ((_EXCS) << _FPUE_CAUSE_SHIFT)
+#define _FPUE_ENABLE(_EXCS) ((_EXCS) << _FPUE_ENABLE_SHIFT)
+#define _FPUE_FLAG(_EXCS) ((_EXCS) << _FPUE_FLAG_SHIFT)
+
+#define _GET_FPUE_CAUSE(_FPUE) (((_FPUE) >> _FPUE_CAUSE_SHIFT) & FE_ALL_EXCEPT)
+#define _GET_FPUE_ENABLE(_FPUE) (((_FPUE) >> _FPUE_ENABLE_SHIFT)& FE_ALL_EXCEPT)
+#define _GET_FPUE_FLAG(_FPUE) (((_FPUE) >> _FPUE_FLAG_SHIFT) & FE_ALL_EXCEPT)
+
+
+/* FPSCR register accessors */
+#ifdef __SH4_NOFPU__
+#define __read_fpscr(_ptr)
+#define __write_fpscr(_val)
+#else
+#define __read_fpscr(_ptr) __asm __volatile("sts fpscr, %0" : "=r" (*(_ptr)))
+#define __write_fpscr(_val) __asm __volatile("lds %0, fpscr" : : "r" (_val))
+#endif
+
+
+/* functions for libm */
+static __inline int
+feclearexcept(int __excepts)
+{
+ uint32_t __fpscr;
+
+ __read_fpscr(&__fpscr);
+ __fpscr &= ~_FPUE_FLAG(__excepts);
+ __write_fpscr(__fpscr);
+ return (0);
+}
+
+static __inline int
+fegetexceptflag(fexcept_t *__flagp, int __excepts)
+{
+ uint32_t __fpscr;
+
+ __read_fpscr(&__fpscr);
+ *__flagp = _GET_FPUE_FLAG(__fpscr) & __excepts;
+ return (0);
+}
+
+
+static __inline int
+fesetexceptflag(const fexcept_t *__flagp, int __excepts)
+{
+ uint32_t __fpscr;
+
+ __read_fpscr(&__fpscr);
+ __fpscr &= ~_FPUE_FLAG(__excepts);
+ __fpscr |= ~_FPUE_FLAG(*__flagp & __excepts);
+ __write_fpscr(__fpscr);
+ return (0);
+}
+
+
+static __inline int
+feraiseexcept(int __excepts)
+{
+ fexcept_t __ex = __excepts;
+
+ fesetexceptflag(&__ex, __excepts); /* XXX */
+ return (0);
+}
+
+
+static __inline int
+fetestexcept(int __excepts)
+{
+ fexcept_t __ex;
+
+ fegetexceptflag(&__ex, __excepts);
+ return (__ex);
+}
+
+
+static __inline int
+fegetround(void)
+{
+ uint32_t __fpscr = 0;
+
+ __read_fpscr(&__fpscr);
+ return (__fpscr & _ROUND_MASK);
+}
+
+static __inline int
+fesetround(int __round)
+{
+ uint32_t __fpscr = 0;
+
+ if (__round == FE_UPWARD || __round == FE_DOWNWARD) {
+ fprintf(stderr, "libm superh : "
+ "upward/downward rounding not supporetd.\n");
+ return -1;
+ }
+
+ __read_fpscr(&__fpscr);
+ __fpscr &= ~_ROUND_MASK;
+ __fpscr |= (__round & _ROUND_MASK);
+ __write_fpscr(__fpscr);
+ return (0);
+}
+
+static __inline int
+fegetenv(fenv_t *__envp)
+{
+ __read_fpscr(__envp);
+ return (0);
+}
+
+static __inline int
+feholdexcept(fenv_t *__envp)
+{
+ uint32_t __fpscr;
+
+ __read_fpscr(&__fpscr);
+ *__envp = __fpscr;
+ __fpscr &= ~_FPUE_FLAG(FE_ALL_EXCEPT);
+ __write_fpscr(__fpscr);
+ return (0);
+}
+
+
+static __inline int
+fesetenv(const fenv_t *__envp)
+{
+ __write_fpscr(*__envp);
+ return (0);
+}
+
+
+static __inline int
+feupdateenv(const fenv_t *__envp)
+{
+ uint32_t __fpscr;
+
+ __read_fpscr(&__fpscr);
+ __write_fpscr(*__envp);
+ feraiseexcept(_GET_FPUE_FLAG(__fpscr));
+ return (0);
+}
+
+#if __BSD_VISIBLE
+
+static __inline int
+feenableexcept(int __mask)
+{
+ uint32_t __old_fpscr, __new_fpscr;
+
+ __read_fpscr(&__old_fpscr);
+ __new_fpscr = __old_fpscr | _FPUE_ENABLE(__mask & FE_ALL_EXCEPT);
+ __write_fpscr(__new_fpscr);
+ return (_GET_FPUE_ENABLE(__old_fpscr));
+}
+
+static __inline int
+fedisableexcept(int __mask)
+{
+ uint32_t __old_fpscr, __new_fpscr;
+
+ __read_fpscr(&__old_fpscr);
+ __new_fpscr = __old_fpscr & ~(_FPUE_ENABLE(__mask & FE_ALL_EXCEPT));
+ __write_fpscr(__new_fpscr);
+ return (_GET_FPUE_ENABLE(__old_fpscr));
+}
+
+static __inline int
+fegetexcept(void)
+{
+ uint32_t __fpscr;
+
+ __read_fpscr(&__fpscr);
+ return (_GET_FPUE_ENABLE(__fpscr));
+}
+
+#endif /* __BSD_VISIBLE */
+
+
+#endif /* _FENV_H_ */
+