1 files changed, 79 insertions, 0 deletions
diff --git a/ports/sysdeps/unix/sysv/linux/alpha/setfpucw.c b/ports/sysdeps/unix/sysv/linux/alpha/setfpucw.c
new file mode 100644
index 0000000000..becc11f94c
--- /dev/null
+++ b/ports/sysdeps/unix/sysv/linux/alpha/setfpucw.c
@@ -0,0 +1,79 @@
+/* Set FP exception mask and rounding mode.
+   Copyright (C) 1996, 1997, 1998, 2003 Free Software Foundation, Inc.
+   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, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <fpu_control.h>
+#include <asm/fpu.h>
+
+extern void		__ieee_set_fp_control (unsigned long);
+libc_hidden_proto(__ieee_set_fp_control)
+
+extern unsigned long	__ieee_get_fp_control (void);
+libc_hidden_proto(__ieee_get_fp_control)
+
+static inline unsigned long
+rdfpcr (void)
+{
+  unsigned long fpcr;
+  asm ("excb; mf_fpcr %0" : "=f"(fpcr));
+  return fpcr;
+}
+
+
+static inline void
+wrfpcr (unsigned long fpcr)
+{
+  asm volatile ("mt_fpcr %0; excb" : : "f"(fpcr));
+}
+
+
+void
+__setfpucw (fpu_control_t fpu_control)
+{
+  unsigned long fpcr = 0, fpcw = 0;
+
+  if (!fpu_control)
+    fpu_control = _FPU_DEFAULT;
+
+  /* first, set dynamic rounding mode: */
+
+  fpcr = rdfpcr();
+  fpcr &= ~FPCR_DYN_MASK;
+  switch (fpu_control & 0xc00)
+    {
+    case _FPU_RC_NEAREST:	fpcr |= FPCR_DYN_NORMAL; break;
+    case _FPU_RC_DOWN:		fpcr |= FPCR_DYN_MINUS; break;
+    case _FPU_RC_UP:		fpcr |= FPCR_DYN_PLUS; break;
+    case _FPU_RC_ZERO:		fpcr |= FPCR_DYN_CHOPPED; break;
+    }
+  wrfpcr(fpcr);
+
+  /* now tell kernel about traps that we like to hear about: */
+
+  fpcw = __ieee_get_fp_control();
+  fpcw &= ~IEEE_TRAP_ENABLE_MASK;
+
+  if (!(fpu_control & _FPU_MASK_IM)) fpcw |= IEEE_TRAP_ENABLE_INV;
+  if (!(fpu_control & _FPU_MASK_DM)) fpcw |= IEEE_TRAP_ENABLE_UNF;
+  if (!(fpu_control & _FPU_MASK_ZM)) fpcw |= IEEE_TRAP_ENABLE_DZE;
+  if (!(fpu_control & _FPU_MASK_OM)) fpcw |= IEEE_TRAP_ENABLE_OVF;
+  if (!(fpu_control & _FPU_MASK_PM)) fpcw |= IEEE_TRAP_ENABLE_INE;
+
+  __fpu_control = fpu_control;	/* update global copy */
+
+  __ieee_set_fp_control(fpcw);
+}