fenv: Move shared x86 sys/fenv.h from x86_64 to shared_x86

drop matching symlink in i386

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

1 files changed, 175 insertions, 0 deletions

diff --git a/newlib/libc/machine/shared_x86/sys/fenv.h b/newlib/libc/machine/shared_x86/sys/fenv.h
new file mode 100644
index 0000000..0cf152a
--- /dev/null
+++ b/newlib/libc/machine/shared_x86/sys/fenv.h
@@ -0,0 +1,175 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2010-2019 Red Hat, Inc.
+ * 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.
+ */
+
+#ifndef _SYS_FENV_H
+#define _SYS_FENV_H 1
+
+#include <sys/cdefs.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+/* Primary sources:
+
+     The Open Group Base Specifications Issue 6:
+   http://www.opengroup.org/onlinepubs/000095399/basedefs/fenv.h.html
+
+     C99 Language spec (draft n1256):
+   <url unknown>
+
+     Intel(R) 64 and IA-32 Architectures Software Developer's Manuals:
+   http://www.intel.com/products/processor/manuals/
+
+     GNU C library manual pages:
+   http://www.gnu.org/software/libc/manual/html_node/Control-Functions.html
+   http://www.gnu.org/software/libc/manual/html_node/Rounding.html
+   http://www.gnu.org/software/libc/manual/html_node/FP-Exceptions.html
+   http://www.gnu.org/software/libc/manual/html_node/Status-bit-operations.html
+
+     Linux online man page(s):
+   http://linux.die.net/man/3/fegetexcept
+
+    The documentation quotes these sources for reference.  All definitions and
+   code have been developed solely based on the information from these specs.
+
+*/
+
+/*  Represents the entire floating-point environment. The floating-point
+   environment refers collectively to any floating-point status flags and
+   control modes supported by the implementation.
+    In this implementation, the struct contains the state information from
+   the fstenv/fnstenv instructions and a copy of the SSE MXCSR, since GCC
+   uses SSE for a lot of floating-point operations.  (Cygwin assumes i686
+   or above these days, as does the compiler.)  */
+
+typedef struct _fenv_t
+{
+  struct _fpu_env_info {
+    unsigned int _fpu_cw;	/* low 16 bits only. */
+    unsigned int _fpu_sw;	/* low 16 bits only. */
+    unsigned int _fpu_tagw;	/* low 16 bits only. */
+    unsigned int _fpu_ipoff;
+    unsigned int _fpu_ipsel;
+    unsigned int _fpu_opoff;
+    unsigned int _fpu_opsel;	/* low 16 bits only. */
+  } _fpu;
+  unsigned int _sse_mxcsr;
+} fenv_t;
+
+/*  Represents the floating-point status flags collectively, including
+   any status the implementation associates with the flags. A floating-point
+   status flag is a system variable whose value is set (but never cleared)
+   when a floating-point exception is raised, which occurs as a side effect
+   of exceptional floating-point arithmetic to provide auxiliary information.
+    A floating-point control mode is a system variable whose value may be
+   set by the user to affect the subsequent behavior of floating-point
+   arithmetic. */
+
+typedef __uint32_t fexcept_t;
+
+/*  The <fenv.h> header shall define the following constants if and only
+   if the implementation supports the floating-point exception by means
+   of the floating-point functions feclearexcept(), fegetexceptflag(),
+   feraiseexcept(), fesetexceptflag(), and fetestexcept(). Each expands to
+   an integer constant expression with values such that bitwise-inclusive
+   ORs of all combinations of the constants result in distinct values.  */
+
+#define FE_DIVBYZERO	(1 << 2)
+#define FE_INEXACT	(1 << 5)
+#define FE_INVALID	(1 << 0)
+#define FE_OVERFLOW	(1 << 3)
+#define FE_UNDERFLOW	(1 << 4)
+
+/*  The <fenv.h> header shall define the following constant, which is
+   simply the bitwise-inclusive OR of all floating-point exception
+   constants defined above:  */
+
+/* in agreement w/ Linux the subnormal exception will always be masked */
+#define FE_ALL_EXCEPT \
+  (FE_INEXACT | FE_UNDERFLOW | FE_OVERFLOW | FE_DIVBYZERO | FE_INVALID)
+
+/*  The <fenv.h> header shall define the following constants if and only
+   if the implementation supports getting and setting the represented
+   rounding direction by means of the fegetround() and fesetround()
+   functions. Each expands to an integer constant expression whose values
+   are distinct non-negative vales.  */
+
+#define FE_DOWNWARD	(1)
+#define FE_TONEAREST	(0)
+#define FE_TOWARDZERO	(3)
+#define FE_UPWARD	(2)
+
+/* Only Solaris and QNX implement fegetprec/fesetprec.  As Solaris, use the
+   values defined by http://www.open-std.org/jtc1/sc22//WG14/www/docs/n752.htm
+   QNX defines different values. */
+#if __MISC_VISIBLE
+#define FE_FLTPREC	(0)
+#define FE_DBLPREC	(2)
+#define FE_LDBLPREC	(3)
+#endif
+
+/*  The <fenv.h> header shall define the following constant, which
+   represents the default floating-point environment (that is, the one
+   installed at program startup) and has type pointer to const-qualified
+   fenv_t. It can be used as an argument to the functions within the
+   <fenv.h> header that manage the floating-point environment.  */
+
+extern const fenv_t *_fe_dfl_env;
+#define FE_DFL_ENV (_fe_dfl_env)
+
+/*  Additional implementation-defined environments, with macro
+   definitions beginning with FE_ and an uppercase letter,and having
+   type "pointer to const-qualified fenv_t",may also be specified by
+   the implementation.  */
+
+#if __GNU_VISIBLE
+/*  If possible, the GNU C Library defines a macro FE_NOMASK_ENV which
+   represents an environment where every exception raised causes a trap
+   to occur. You can test for this macro using #ifdef. It is only defined
+   if _GNU_SOURCE is defined.  */
+extern const fenv_t *_fe_nomask_env;
+#define FE_NOMASK_ENV (_fe_nomask_env)
+
+/* These are GNU extensions defined in glibc.  */
+int feenableexcept (int __excepts);
+int fedisableexcept (int __excepts);
+int fegetexcept (void);
+#endif /* __GNU_VISIBLE */
+
+#ifdef __INSIDE_CYGWIN__
+/* This is Cygwin-custom, not from the standard, for use in the Cygwin CRT.  */
+extern void _feinitialise ();
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _FENV_H */