From 800e6ecc07d01c49808cc4f9597d94cc8cfd9fae Mon Sep 17 00:00:00 2001
From: Gabe Black <gblack@eecs.umich.edu>
Date: Fri, 11 Aug 2006 19:43:10 -0400
Subject: Pushed most of constants.hh back into isa_traits.hh and regfile.hh
 and created a seperate file for the syscallreturn class.

--HG--
extra : convert_revision : 9507ea1c09fda959f00aec9ec8ffb887ec8dd0f9
---
 src/arch/alpha/syscallreturn.hh | 87 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 87 insertions(+)
 create mode 100644 src/arch/alpha/syscallreturn.hh

(limited to 'src/arch/alpha/syscallreturn.hh')

diff --git a/src/arch/alpha/syscallreturn.hh b/src/arch/alpha/syscallreturn.hh
new file mode 100644
index 000000000..803c3b7da
--- /dev/null
+++ b/src/arch/alpha/syscallreturn.hh
@@ -0,0 +1,87 @@
+/*
+ * Copyright (c) 2003-2005 The Regents of The University of Michigan
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * 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;
+ * neither the name of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT
+ * OWNER 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.
+ *
+ * Authors: Steve Reinhardt
+ *          Gabe Black
+ */
+
+#ifndef __ARCH_ALPHA_SYSCALLRETURN_HH__
+#define __ARCH_ALPHA_SYSCALLRETURN_HH__
+
+class SyscallReturn {
+    public:
+       template <class T>
+       SyscallReturn(T v, bool s)
+       {
+           retval = (uint64_t)v;
+           success = s;
+       }
+
+       template <class T>
+       SyscallReturn(T v)
+       {
+           success = (v >= 0);
+           retval = (uint64_t)v;
+       }
+
+       ~SyscallReturn() {}
+
+       SyscallReturn& operator=(const SyscallReturn& s) {
+           retval = s.retval;
+           success = s.success;
+           return *this;
+       }
+
+       bool successful() { return success; }
+       uint64_t value() { return retval; }
+
+
+   private:
+       uint64_t retval;
+       bool success;
+};
+
+namespace AlphaISA
+{
+    static inline void setSyscallReturn(SyscallReturn return_value, RegFile *regs)
+    {
+        // check for error condition.  Alpha syscall convention is to
+        // indicate success/failure in reg a3 (r19) and put the
+        // return value itself in the standard return value reg (v0).
+        if (return_value.successful()) {
+            // no error
+            regs->setIntReg(SyscallSuccessReg, 0);
+            regs->setIntReg(ReturnValueReg, return_value.value());
+        } else {
+            // got an error, return details
+            regs->setIntReg(SyscallSuccessReg, (IntReg)-1);
+            regs->setIntReg(ReturnValueReg, -return_value.value());
+        }
+    }
+}
+
+#endif
-- 
cgit v1.2.3