2 * Copyright (c) 2006 The Regents of The University of Michigan
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.
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.
31 #ifndef __ARCH_SPARC_PREDECODER_HH__
32 #define __ARCH_SPARC_PREDECODER_HH__
34 #include "arch/sparc/types.hh"
35 #include "base/misc.hh"
36 #include "sim/host.hh"
46 //The extended machine instruction being generated
50 Predecoder(ThreadContext * _tc) : tc(_tc)
53 ThreadContext * getTC()
58 void setTC(ThreadContext * _tc)
67 //Use this to give data to the predecoder. This should be used
68 //when there is control flow.
69 void moreBytes(Addr currPC, Addr off, MachInst inst)
74 //The I bit, bit 13, is used to figure out where the ASI
75 //should come from. Use that in the ExtMachInst. This is
76 //slightly redundant, but it removes the need to put a condition
77 //into all the execute functions
79 emi |= (static_cast<ExtMachInst>(
80 tc->readMiscRegNoEffect(MISCREG_ASI))
81 << (sizeof(MachInst) * 8));
83 emi |= (static_cast<ExtMachInst>(bits(inst, 12, 5))
84 << (sizeof(MachInst) * 8));
87 //Use this to give data to the predecoder. This should be used
88 //when instructions are executed in order.
89 void moreBytes(MachInst machInst)
91 moreBytes(0, 0, machInst);
99 bool extMachInstReady()
104 //This returns a constant reference to the ExtMachInst to avoid a copy
105 const ExtMachInst & getExtMachInst()
112 #endif // __ARCH_SPARC_PREDECODER_HH__