libm: Add support for the Meta architecture

Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

2 files changed, 78 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/metag/bits/fenv.h b/libc/sysdeps/linux/metag/bits/fenv.h
new file mode 100644
index 000000000..279440504
--- /dev/null
+++ b/libc/sysdeps/linux/metag/bits/fenv.h
@@ -0,0 +1,77 @@
+/* Copyright (C) 2013 Imagination Technologies Ltd.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#ifndef _FENV_H
+# error "Never use <bits/fenv.h> directly; include <fenv.h> instead."
+#endif
+
+
+/* Define bits representing the exception.  We use the bit positions
+   of the appropriate bits in TXDEFR.  */
+enum
+  {
+    FE_INEXACT = 0x1,
+#define FE_INEXACT	FE_INEXACT
+    FE_UNDERFLOW = 0x2,
+#define FE_UNDERFLOW	FE_UNDERFLOW
+    FE_OVERFLOW = 0x4,
+#define FE_OVERFLOW	FE_OVERFLOW
+    FE_DIVBYZERO = 0x8,
+#define FE_DIVBYZERO	FE_DIVBYZERO
+    FE_INVALID = 0x10,
+#define FE_INVALID	FE_INVALID
+  };
+
+#define FE_ALL_EXCEPT \
+	(FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID)
+
+/* The Meta FPU supports all of the four defined rounding modes.  We
+   use the values of the rounding mode bits in TXMODE as the values
+   for the appropriate macros.  */
+enum
+  {
+    FE_TONEAREST = 0x0,
+#define FE_TONEAREST	FE_TONEAREST
+    FE_TOWARDZERO = 0x1,
+#define FE_TOWARDZERO	FE_TOWARDZERO
+    FE_UPWARD = 0x2,
+#define FE_UPWARD	FE_UPWARD
+    FE_DOWNWARD = 0x3
+#define FE_DOWNWARD	FE_DOWNWARD
+  };
+
+
+/* Type representing exception flags.  */
+typedef unsigned int fexcept_t;
+
+
+/* Type representing floating-point environment.  */
+typedef struct
+  {
+    unsigned int txdefr;
+    unsigned int txmode;
+  }
+fenv_t;
+
+/* If the default argument is used we use this value.  */
+#define FE_DFL_ENV	((__const fenv_t *) -1)
+
+#ifdef __USE_GNU
+/* Floating-point environment where none of the exception is masked.  */
+# define FE_NOMASK_ENV  ((__const fenv_t *) -2)
+#endif
diff --git a/libc/sysdeps/linux/metag/metag.c b/libc/sysdeps/linux/metag/metag.c
index a92f2149c..bf2be68c8 100644
--- a/libc/sysdeps/linux/metag/metag.c
+++ b/libc/sysdeps/linux/metag/metag.c
@@ -8,3 +8,4 @@
 #include <sys/syscall.h>
 
 _syscall2(int,metag_setglobalbit,char *,addr,int,mask)
+_syscall1(void,metag_set_fpu_flags,unsigned int,flags)