ras.hh revision 2665
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 * Authors: Kevin Lim 29 */ 30 31#ifndef __CPU_O3_CPU_RAS_HH__ 32#define __CPU_O3_CPU_RAS_HH__ 33 34// For Addr type. 35#include "arch/isa_traits.hh" 36 37class ReturnAddrStack 38{ 39 public: 40 ReturnAddrStack(unsigned numEntries); 41 42 Addr top() 43 { return addrStack[tos]; } 44 45 unsigned topIdx() 46 { return tos; } 47 48 void push(const Addr &return_addr); 49 50 void pop(); 51 52 void restore(unsigned top_entry_idx, const Addr &restored_target); 53 54 private: 55 inline void incrTos() 56 { if (++tos == numEntries) tos = 0; } 57 58 inline void decrTos() 59 { tos = (tos == 0 ? numEntries - 1 : tos - 1); } 60 61 Addr *addrStack; 62 63 unsigned numEntries; 64 65 unsigned usedEntries; 66 67 unsigned tos; 68}; 69 70#endif // __CPU_O3_CPU_RAS_HH__ 71