Add VPtr class that makes it possible to esentially create

a pointer to an object that lives inside simulated memory.
Useful for doing a bit of analysis of what's going on in
the running kernel.

--HG--
extra : convert_revision : d78089cce5ec4334483a710ba512eaf18d9b0319

1 files changed, 113 insertions, 0 deletions

diff --git a/arch/alpha/vptr.hh b/arch/alpha/vptr.hh
new file mode 100644
index 000000000..7f0b036a3
--- /dev/null
+++ b/arch/alpha/vptr.hh
@@ -0,0 +1,113 @@
+/*
+ * Copyright (c) 2003 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.
+ */
+
+#ifndef __VPTR_HH__
+#define __VPTR_HH__
+
+#include "arch/alpha/vtophys.hh"
+
+class ExecContext;
+
+template <class T>
+class VPtr
+{
+  public:
+    typedef T Type;
+
+  private:
+    ExecContext *xc;
+    Addr ptr;
+
+  public:
+    ExecContext *GetXC() const { return xc; }
+    Addr GetPointer() const { return ptr; }
+
+  public:
+    explicit VPtr(ExecContext *_xc, Addr p = 0) : xc(_xc), ptr(p) { }
+    template <class U>
+    VPtr(const VPtr<U> &vp) : xc(vp.GetXC()), ptr(vp.GetPointer()) {}
+    ~VPtr() {}
+
+    bool operator!() const
+    {
+        return ptr == 0;
+    }
+
+    VPtr<T> operator+(int offset)
+    {
+        VPtr<T> ptr(*this);
+        ptr += offset;
+
+        return ptr;
+    }
+
+    const VPtr<T> &operator+=(int offset)
+    {
+        ptr += offset;
+        assert((ptr & (ALPHA_PGBYTES - 1)) + sizeof(T) < ALPHA_PGBYTES);
+
+        return *this;
+    }
+
+    const VPtr<T> &operator=(Addr p)
+    {
+        assert((p & (ALPHA_PGBYTES - 1)) + sizeof(T) < ALPHA_PGBYTES);
+        ptr = p;
+
+        return *this;
+    }
+
+    template <class U>
+    const VPtr<T> &operator=(const VPtr<U> &vp)
+    {
+        xc = vp.GetXC();
+        ptr = vp.GetPointer();
+
+        return *this;
+    }
+
+    operator T *()
+    {
+        void *addr = vtomem(xc, ptr, sizeof(T));
+        return (T *)addr;
+    }
+
+    T *operator->()
+    {
+        void *addr = vtomem(xc, ptr, sizeof(T));
+        return (T *)addr;
+    }
+
+    T &operator*()
+    {
+        void *addr = vtomem(xc, ptr, sizeof(T));
+        return *(T *)addr;
+    }
+};
+
+#endif // __VPTR_HH__