1 files changed, 91 insertions, 0 deletions
diff --git a/ports/sysdeps/unix/sysv/linux/alpha/fraiseexcpt.c b/ports/sysdeps/unix/sysv/linux/alpha/fraiseexcpt.c
new file mode 100644
index 0000000000..a01b2cf11a
--- /dev/null
+++ b/ports/sysdeps/unix/sysv/linux/alpha/fraiseexcpt.c
@@ -0,0 +1,91 @@
+/* Copyright (C) 2004,2006 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 <fenv_libc.h>
+#include <sysdep.h>
+#include <float.h>
+#include <kernel-features.h>
+#include "kernel_sysinfo.h"
+
+
+int
+__feraiseexcept (int excepts)
+{
+  INTERNAL_SYSCALL_DECL (err);
+  unsigned long t = excepts;
+  long r;
+
+  r = INTERNAL_SYSCALL (osf_setsysinfo, err, 2, SSI_IEEE_RAISE_EXCEPTION, &t);
+
+#ifndef __ASSUME_IEEE_RAISE_EXCEPTION
+  if (!INTERNAL_SYSCALL_ERROR_P (r, err))
+    return 0;
+
+  double d;
+
+  /* If we got an error from SSI_IEEE_RAISE_EXCEPTION, assume it means that
+     the system call isn't actually implemented.  Do the best we can.  */
+
+  /* Invalid implemented with 0 / 0 -> NaN.  */
+  if (excepts & FE_INVALID)
+    __asm__ __volatile__ ("divs/su $f31,$f31,%0; trapb" : "=f"(d) : );
+
+  /* Division By Zero implemented with 1 / 0 -> NaN.  */
+  if (excepts & FE_DIVBYZERO)
+    __asm__ __volatile__ ("divs/su %1,$f31,%0; trapb" : "=&f"(d) : "f"(1.0f));
+
+  /* Overflow and underflow cannot be had all by themselves.  We can
+     generate them with arithmetic, but we always get INEXACT raised
+     at the same time.  Prepare to undo.  */
+  if ((excepts & (FE_OVERFLOW | FE_UNDERFLOW)) && !(excepts & FE_INEXACT))
+    INTERNAL_SYSCALL (osf_getsysinfo, err, 2, GSI_IEEE_FP_CONTROL, &t);
+
+  /* Overflow implemented with FLT_MAX + FLT_MAX -> Inf.  */
+  if (excepts & FE_OVERFLOW)
+    __asm__ __volatile__ ("adds/sui %1,%1,%0; trapb"
+			  : "=&f"(d) : "f"(FLT_MAX));
+
+  /* Underflow implemented with FLT_MIN * FLT_MIN -> 0.  */
+  if (excepts & FE_UNDERFLOW)
+    __asm__ __volatile__ ("muls/sui %1,%1,%0; trapb"
+			  : "=&f"(d) : "f"(FLT_MIN));
+
+  /* Inexact implemented with (long)0.5 -> 0.  */
+  if ((excepts & (FE_OVERFLOW | FE_UNDERFLOW | FE_INEXACT)) == FE_INEXACT)
+    __asm__ __volatile__ ("cvttq/svi %1,%0; trapb" : "=&f"(d) : "f"(0.5f));
+
+  /* If we raised inexact when not asked, and inexact was not previously
+     raised, then clear that exception.  */
+  if ((excepts & (FE_OVERFLOW | FE_UNDERFLOW))
+      && !((excepts | t) & FE_INEXACT))
+    {
+      t |= excepts & SWCR_STATUS_MASK;
+      INTERNAL_SYSCALL (osf_setsysinfo, err, 2, SSI_IEEE_FP_CONTROL, &t);
+    }
+#endif /* !__ASSUME_IEEE_RAISE_EXCEPTION */
+
+  return 0;
+}
+
+#include <shlib-compat.h>
+#if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
+strong_alias (__feraiseexcept, __old_feraiseexcept)
+compat_symbol (libm, __old_feraiseexcept, feraiseexcept, GLIBC_2_1);
+#endif
+
+libm_hidden_ver (__feraiseexcept, feraiseexcept)
+versioned_symbol (libm, __feraiseexcept, feraiseexcept, GLIBC_2_2);