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Diffstat (limited to 'src/arch/power/predecoder.hh')
-rw-r--r-- | src/arch/power/predecoder.hh | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/src/arch/power/predecoder.hh b/src/arch/power/predecoder.hh new file mode 100644 index 000000000..1f3ac41cb --- /dev/null +++ b/src/arch/power/predecoder.hh @@ -0,0 +1,121 @@ +/* + * Copyright (c) 2006 The Regents of The University of Michigan + * Copyright (c) 2007-2008 The Florida State University + * Copyright (c) 2009 The University of Edinburgh + * 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: Gabe Black + * Stephen Hines + * Timothy M. Jones + */ + +#ifndef __ARCH_ARM_PREDECODER_HH__ +#define __ARCH_ARM_PREDECODER_HH__ + +#include "arch/power/types.hh" +#include "base/misc.hh" +#include "base/types.hh" + +class ThreadContext; + +namespace PowerISA +{ + +class Predecoder +{ + protected: + ThreadContext * tc; + + // The extended machine instruction being generated + ExtMachInst emi; + + public: + Predecoder(ThreadContext * _tc) + : tc(_tc) + { + } + + ThreadContext * + getTC() + { + return tc; + } + + void + setTC(ThreadContext * _tc) + { + tc = _tc; + } + + void + process() + { + } + + void + reset() + { + } + + // Use this to give data to the predecoder. This should be used + // when there is control flow. + void + moreBytes(Addr pc, Addr fetchPC, MachInst inst) + { + emi = inst; + } + + // Use this to give data to the predecoder. This should be used + // when instructions are executed in order. + void + moreBytes(MachInst machInst) + { + moreBytes(0, 0, machInst); + } + + bool + needMoreBytes() + { + return true; + } + + bool + extMachInstReady() + { + return true; + } + + // This returns a constant reference to the ExtMachInst to avoid a copy + const ExtMachInst & + getExtMachInst() + { + return emi; + } +}; + +} // PowerISA namespace + +#endif // __ARCH_POWER_PREDECODER_HH__ |