upload android base code part3

android/bionic/libm/arm/fenv.c

@@ -0,0 +1,139 @@
+/*-
+ * Copyright (c) 2004 David Schultz <das@FreeBSD.ORG>
+ * 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.
+ *
+ * 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.
+ *
+ * $FreeBSD: src/lib/msun/arm/fenv.c,v 1.1 2004/06/06 10:03:59 das Exp $
+ */
+
+#include <fenv.h>
+
+#define FPSCR_ENABLE_SHIFT 8
+#define FPSCR_ENABLE_MASK  (FE_ALL_EXCEPT << FPSCR_ENABLE_SHIFT)
+
+#define FPSCR_RMODE_SHIFT 22
+
+const fenv_t __fe_dfl_env = 0;
+
+int fegetenv(fenv_t* __envp) {
+  fenv_t _fpscr;
+  __asm__ __volatile__("vmrs %0,fpscr" : "=r" (_fpscr));
+  *__envp = _fpscr;
+  return 0;
+}
+
+int fesetenv(const fenv_t* __envp) {
+  fenv_t _fpscr = *__envp;
+  __asm__ __volatile__("vmsr fpscr,%0" : :"ri" (_fpscr));
+  return 0;
+}
+
+int feclearexcept(int __excepts) {
+  fexcept_t __fpscr;
+  fegetenv(&__fpscr);
+  __fpscr &= ~__excepts;
+  fesetenv(&__fpscr);
+  return 0;
+}
+
+int fegetexceptflag(fexcept_t* __flagp, int __excepts) {
+  fexcept_t __fpscr;
+  fegetenv(&__fpscr);
+  *__flagp = __fpscr & __excepts;
+  return 0;
+}
+
+int fesetexceptflag(const fexcept_t* __flagp, int __excepts) {
+  fexcept_t __fpscr;
+  fegetenv(&__fpscr);
+  __fpscr &= ~__excepts;
+  __fpscr |= *__flagp & __excepts;
+  fesetenv(&__fpscr);
+  return 0;
+}
+
+int feraiseexcept(int __excepts) {
+  fexcept_t __ex = __excepts;
+  fesetexceptflag(&__ex, __excepts);
+  return 0;
+}
+
+int fetestexcept(int __excepts) {
+  fexcept_t __fpscr;
+  fegetenv(&__fpscr);
+  return (__fpscr & __excepts);
+}
+
+int fegetround(void) {
+  fenv_t _fpscr;
+  fegetenv(&_fpscr);
+  return ((_fpscr >> FPSCR_RMODE_SHIFT) & 0x3);
+}
+
+int fesetround(int __round) {
+  fenv_t _fpscr;
+  fegetenv(&_fpscr);
+  _fpscr &= ~(0x3 << FPSCR_RMODE_SHIFT);
+  _fpscr |= (__round << FPSCR_RMODE_SHIFT);
+  fesetenv(&_fpscr);
+  return 0;
+}
+
+int feholdexcept(fenv_t* __envp) {
+  fenv_t __env;
+  fegetenv(&__env);
+  *__envp = __env;
+  __env &= ~(FE_ALL_EXCEPT | FPSCR_ENABLE_MASK);
+  fesetenv(&__env);
+  return 0;
+}
+
+int feupdateenv(const fenv_t* __envp) {
+  fexcept_t __fpscr;
+  fegetenv(&__fpscr);
+  fesetenv(__envp);
+  feraiseexcept(__fpscr & FE_ALL_EXCEPT);
+  return 0;
+}
+
+int feenableexcept(int __mask) {
+  fenv_t __old_fpscr, __new_fpscr;
+  fegetenv(&__old_fpscr);
+  __new_fpscr = __old_fpscr | (__mask & FE_ALL_EXCEPT) << FPSCR_ENABLE_SHIFT;
+  fesetenv(&__new_fpscr);
+  return ((__old_fpscr >> FPSCR_ENABLE_SHIFT) & FE_ALL_EXCEPT);
+}
+
+int fedisableexcept(int __mask) {
+  fenv_t __old_fpscr, __new_fpscr;
+  fegetenv(&__old_fpscr);
+  __new_fpscr = __old_fpscr & ~((__mask & FE_ALL_EXCEPT) << FPSCR_ENABLE_SHIFT);
+  fesetenv(&__new_fpscr);
+  return ((__old_fpscr >> FPSCR_ENABLE_SHIFT) & FE_ALL_EXCEPT);
+}
+
+int fegetexcept(void) {
+  fenv_t __fpscr;
+  fegetenv(&__fpscr);
+  return ((__fpscr & FPSCR_ENABLE_MASK) >> FPSCR_ENABLE_SHIFT);
+}