ras.hh revision 1689 
1/*
2 * Copyright (c) 2004-2005 The Regents of The University of Michigan
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;
9 * redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution;
12 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#ifndef __CPU_BETA_CPU_RAS_HH__
30#define __CPU_BETA_CPU_RAS_HH__
31
32// For Addr type.
33#include "arch/alpha/isa_traits.hh"
34
35class ReturnAddrStack
36{
37  public:
38    ReturnAddrStack(unsigned numEntries);
39
40    Addr top()
41    { return addrStack[tos]; }
42
43    unsigned topIdx()
44    { return tos; }
45
46    void push(const Addr &return_addr);
47
48    void pop();
49
50    void restore(unsigned top_entry_idx, const Addr &restored_target);
51
52  private:
53    inline void incrTos()
54    { if (++tos == numEntries) tos = 0; }
55
56    inline void decrTos()
57    { tos = (tos == 0 ? numEntries - 1 : tos - 1); }
58
59    Addr *addrStack;
60
61    unsigned numEntries;
62
63    unsigned usedEntries;
64
65    unsigned tos;
66};
67
68#endif // __CPU_BETA_CPU_RAS_HH__
69