AArch64: Initial AArch64 port of libm

This patch adds intial support for AArch64 to bionic's libm.

Change-Id: I9ae0f895bbdd7fe67815e6ca1ead627581163a27
Signed-off-by: Serban Constantinescu <serban.constantinescu@arm.com>

1 files changed, 232 insertions, 0 deletions

diff --git a/libm/include/aarch64/fenv.h b/libm/include/aarch64/fenv.h
new file mode 100644
index 0000000..32c3b1d
--- /dev/null
+++ b/libm/include/aarch64/fenv.h
@@ -0,0 +1,232 @@
+/*-
+ * Copyright (c) 2004-2005 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.h,v 1.5 2005/03/16 19:03:45 das Exp $
+ */
+
+/*
+ * Rewritten for Android.
+ *
+ * The ARM FPSCR (Floating-point Status and Control Register) described here:
+ * http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0344b/Chdfafia.html
+ * has been split into the FPCR (Floating-point Control Register) and FPSR
+ * (Floating-point Status Register) on the ARMv8. These are described briefly in
+ * "Procedure Call Standard for the ARM 64-bit Architecture"
+ * http://infocenter.arm.com/help/topic/com.arm.doc.ihi0055a/IHI0055A_aapcs64.pdf
+ * section 5.1.2 SIMD and Floating-Point Registers
+ */
+
+#ifndef _FENV_H_
+#define _FENV_H_
+
+#include <sys/types.h>
+
+__BEGIN_DECLS
+
+typedef __uint32_t fenv_t;
+typedef __uint32_t fexcept_t;
+
+/* Exception flags. */
+#define FE_INVALID    0x01
+#define FE_DIVBYZERO  0x02
+#define FE_OVERFLOW   0x04
+#define FE_UNDERFLOW  0x08
+#define FE_INEXACT    0x10
+#define FE_ALL_EXCEPT (FE_DIVBYZERO | FE_INEXACT | FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW)
+#define _FPSCR_ENABLE_SHIFT 8
+#define _FPSCR_ENABLE_MASK (FE_ALL_EXCEPT << _FPSCR_ENABLE_SHIFT)
+
+/* Rounding modes. */
+#define FE_TONEAREST  0x0
+#define FE_UPWARD     0x1
+#define FE_DOWNWARD   0x2
+#define FE_TOWARDZERO 0x3
+#define _FPSCR_RMODE_SHIFT 22
+
+#define FPCR_IOE    (1 << 8)
+#define FPCR_DZE    (1 << 9)
+#define FPCR_OFE    (1 << 10)
+#define FPCR_UFE    (1 << 11)
+#define FPCR_IXE    (1 << 12)
+#define FPCR_IDE    (1 << 15)
+#define FPCR_LEN    (7 << 16)
+#define FPCR_STRIDE (3 << 20)
+#define FPCR_RMODE  (3 << 22)
+#define FPCR_FZ     (1 << 24)
+#define FPCR_DN     (1 << 25)
+#define FPCR_AHP    (1 << 26)
+#define FPCR_MASK   (FPCR_IOE | \
+                     FPCR_DZE | \
+                     FPCR_OFE | \
+                     FPCR_UFE | \
+                     FPCR_IXE | \
+                     FPCR_IDE | \
+                     FPCR_LEN | \
+                     FPCR_STRIDE | \
+                     FPCR_RMODE | \
+                     FPCR_FZ | \
+                     FPCR_DN | \
+                     FPCR_AHP )
+
+#define FPSR_IOC    (1 << 0)
+#define FPSR_DZC    (1 << 1)
+#define FPSR_OFC    (1 << 2)
+#define FPSR_UFC    (1 << 3)
+#define FPSR_IXC    (1 << 4)
+#define FPSR_IDC    (1 << 7)
+#define FPSR_QC     (1 << 27)
+#define FPSR_V      (1 << 28)
+#define FPSR_C      (1 << 29)
+#define FPSR_Z      (1 << 30)
+#define FPSR_N      (1 << 31)
+#define FPSR_MASK   (FPSR_IOC | \
+                     FPSR_DZC | \
+                     FPSR_OFC | \
+                     FPSR_UFC | \
+                     FPSR_IXC | \
+                     FPSR_IDC | \
+                     FPSR_QC | \
+                     FPSR_V | \
+                     FPSR_C | \
+                     FPSR_Z | \
+                     FPSR_N )
+
+/* Default floating-point environment. */
+extern const fenv_t __fe_dfl_env;
+#define FE_DFL_ENV (&__fe_dfl_env)
+
+static __inline int fegetenv(fenv_t* __envp) {
+    fenv_t _fpcr, _fpsr;
+    __asm__ __volatile__("mrs %0,fpcr" : "=r" (_fpcr));
+    __asm__ __volatile__("mrs %0,fpsr" : "=r" (_fpsr));
+  *__envp = (_fpcr | _fpsr);
+  return 0;
+}
+
+static __inline int fesetenv(const fenv_t* __envp) {
+    fenv_t _fpcr = (*__envp & FPCR_MASK);
+    fenv_t _fpsr = (*__envp & FPSR_MASK);
+    __asm__ __volatile__("msr fpcr,%0" : :"ri" (_fpcr));
+    __asm__ __volatile__("msr fpsr,%0" : :"ri" (_fpsr));
+  return 0;
+}
+
+static __inline int feclearexcept(int __excepts) {
+  fexcept_t __fpscr;
+  fegetenv(&__fpscr);
+  __fpscr &= ~__excepts;
+  fesetenv(&__fpscr);
+  return 0;
+}
+
+static __inline int fegetexceptflag(fexcept_t* __flagp, int __excepts) {
+  fexcept_t __fpscr;
+  fegetenv(&__fpscr);
+  *__flagp = __fpscr & __excepts;
+  return 0;
+}
+
+static __inline int fesetexceptflag(const fexcept_t* __flagp, int __excepts) {
+  fexcept_t __fpscr;
+  fegetenv(&__fpscr);
+  __fpscr &= ~__excepts;
+  __fpscr |= *__flagp & __excepts;
+  fesetenv(&__fpscr);
+  return 0;
+}
+
+static __inline int feraiseexcept(int __excepts) {
+  fexcept_t __ex = __excepts;
+  fesetexceptflag(&__ex, __excepts);
+  return 0;
+}
+
+static __inline int fetestexcept(int __excepts) {
+  fexcept_t __fpscr;
+  fegetenv(&__fpscr);
+  return (__fpscr & __excepts);
+}
+
+static __inline int fegetround(void) {
+  fenv_t _fpscr;
+  fegetenv(&_fpscr);
+  return ((_fpscr >> _FPSCR_RMODE_SHIFT) & 0x3);
+}
+
+static __inline int fesetround(int __round) {
+  fenv_t _fpscr;
+  fegetenv(&_fpscr);
+  _fpscr &= ~(0x3 << _FPSCR_RMODE_SHIFT);
+  _fpscr |= (__round << _FPSCR_RMODE_SHIFT);
+  fesetenv(&_fpscr);
+  return 0;
+}
+
+static __inline int feholdexcept(fenv_t* __envp) {
+  fenv_t __env;
+  fegetenv(&__env);
+  *__envp = __env;
+  __env &= ~(FE_ALL_EXCEPT | _FPSCR_ENABLE_MASK);
+  fesetenv(&__env);
+  return 0;
+}
+
+static __inline int feupdateenv(const fenv_t* __envp) {
+  fexcept_t __fpscr;
+  fegetenv(&__fpscr);
+  fesetenv(__envp);
+  feraiseexcept(__fpscr & FE_ALL_EXCEPT);
+  return 0;
+}
+
+#if __BSD_VISIBLE
+
+static __inline 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);
+}
+
+static __inline 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);
+}
+
+static __inline int fegetexcept(void) {
+  fenv_t __fpscr;
+  fegetenv(&__fpscr);
+  return ((__fpscr & _FPSCR_ENABLE_MASK) >> _FPSCR_ENABLE_SHIFT);
+}
+
+#endif /* __BSD_VISIBLE */
+
+__END_DECLS
+
+#endif /* !_FENV_H_ */