1 files changed, 102 insertions, 0 deletions
diff --git a/libgcc/config/pa/sfp-exceptions.c b/libgcc/config/pa/sfp-exceptions.c
new file mode 100644
index 0000000..4dadaf4
--- /dev/null
+++ b/libgcc/config/pa/sfp-exceptions.c
@@ -0,0 +1,102 @@
+/*
+ * Copyright (C) 1997-2021 Free Software Foundation, Inc.
+ *
+ * This file is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 3, or (at your option) any
+ * later version.
+ *
+ * This file 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
+ * General Public License for more details.
+ *
+ * Under Section 7 of GPL version 3, you are granted additional
+ * permissions described in the GCC Runtime Library Exception, version
+ * 3.1, as published by the Free Software Foundation.
+ *
+ * You should have received a copy of the GNU General Public License and
+ * a copy of the GCC Runtime Library Exception along with this program;
+ * see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ */
+
+
+#include "sfp-machine.h"
+
+#define HUGE_VAL (__builtin_huge_val ())
+
+/* Please see section 10,
+   page 10-5 "Delayed Trapping" in the PA-RISC 2.0 Architecture manual */
+
+void
+__sfp_handle_exceptions (int _fex)
+{
+  /* Raise exceptions represented by _FEX.  But we must raise only one
+     signal at a time.  It is important that if the overflow/underflow
+     exception and the divide by zero exception are given at the same
+     time, the overflow/underflow exception follows the divide by zero
+     exception.  */
+
+  /* We do these bits in assembly to be certain GCC doesn't optimize
+     away something important, and so we can force delayed traps to
+     occur. */
+
+  /* We use "fldd 0(%%sr0,%%sp),%0" to flush the delayed exception */
+
+  /* First: Invalid exception.  */
+  if (_fex & FP_EX_INVALID)
+    {
+      /* One example of an invalid operation is 0 * Infinity.  */
+      double d = HUGE_VAL;
+      __asm__ __volatile__ (
+		"	fcpy,dbl %%fr0,%%fr22\n"
+		"	fmpy,dbl %0,%%fr22,%0\n"
+		"	fldd 0(%%sr0,%%sp),%0"
+		: "+f" (d) : : "%fr22" );
+    }
+
+  /* Second: Division by zero.  */
+  if (_fex & FP_EX_DIVZERO)
+    {
+      double d = 1.0;
+      __asm__ __volatile__ (
+		"	fcpy,dbl %%fr0,%%fr22\n"
+		"	fdiv,dbl %0,%%fr22,%0\n"
+		"	fldd 0(%%sr0,%%sp),%0"
+		: "+f" (d) : : "%fr22" );
+    }
+
+  /* Third: Overflow.  */
+  if (_fex & FP_EX_OVERFLOW)
+    {
+      double d = __DBL_MAX__;
+      __asm__ __volatile__ (
+		"	fadd,dbl %0,%0,%0\n"
+		"	fldd 0(%%sr0,%%sp),%0"
+		: "+f" (d) );
+    }
+
+  /* Fourth: Underflow.  */
+  if (_fex & FP_EX_UNDERFLOW)
+    {
+      double d = __DBL_MIN__;
+      double e = 3.0;
+      __asm__ __volatile__ (
+		"	fdiv,dbl %0,%1,%0\n"
+		"	fldd 0(%%sr0,%%sp),%0"
+		: "+f" (d) : "f" (e) );
+    }
+
+  /* Fifth: Inexact */
+  if (_fex & FP_EX_INEXACT)
+    {
+      double d = 3.14159265358979323846;
+      double e = 69.69;
+      __asm__ __volatile__ (
+		"	fdiv,dbl %0,%1,%%fr22\n"
+		"	fcnvfxt,dbl,sgl %%fr22,%%fr22L\n"
+		"	fldd 0(%%sr0,%%sp),%%fr22"
+		: : "f" (d), "f" (e) : "%fr22" );
+    }
+}