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/*
* Copyright (c) 2014,2016-2018 ARM Limited
* All rights reserved
*
* The license below extends only to copyright in the software and shall
* not be construed as granting a license to any other intellectual
* property including but not limited to intellectual property relating
* to a hardware implementation of the functionality of the software
* licensed hereunder. You may use the software subject to the license
* terms below provided that you ensure that this notice is replicated
* unmodified and in its entirety in all distributions of the software,
* modified or unmodified, in source code or in binary form.
*
* Copyright (c) 2007-2008 The Florida State University
* 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: Andreas Sandberg
* Stephen Hines
*/
#include "arch/arm/insts/pseudo.hh"
#include "cpu/exec_context.hh"
DecoderFaultInst::DecoderFaultInst(ExtMachInst _machInst)
: ArmStaticInst("gem5decoderFault", _machInst, No_OpClass),
faultId(static_cast<DecoderFault>(
static_cast<uint8_t>(_machInst.decoderFault)))
{
// Don't call execute() if we're on a speculative path and the
// fault is an internal panic fault.
flags[IsNonSpeculative] = (faultId == DecoderFault::PANIC);
}
Fault
DecoderFaultInst::execute(ExecContext *xc, Trace::InstRecord *traceData) const
{
const PCState pc_state(xc->pcState());
const Addr pc(pc_state.instAddr());
switch (faultId) {
case DecoderFault::UNALIGNED:
if (machInst.aarch64) {
return std::make_shared<PCAlignmentFault>(pc);
} else {
// TODO: We should check if we the receiving end is in
// aarch64 mode and raise a PCAlignment fault instead.
return std::make_shared<PrefetchAbort>(
pc, ArmFault::AlignmentFault);
}
case DecoderFault::PANIC:
panic("Internal error in instruction decoder\n");
case DecoderFault::OK:
panic("Decoder fault instruction without decoder fault.\n");
}
panic("Unhandled fault type");
}
const char *
DecoderFaultInst::faultName() const
{
switch (faultId) {
case DecoderFault::OK:
return "OK";
case DecoderFault::UNALIGNED:
return "UnalignedInstruction";
case DecoderFault::PANIC:
return "DecoderPanic";
}
panic("Unhandled fault type");
}
std::string
DecoderFaultInst::generateDisassembly(Addr pc, const SymbolTable *symtab) const
{
return csprintf("gem5fault %s", faultName());
}
FailUnimplemented::FailUnimplemented(const char *_mnemonic,
ExtMachInst _machInst)
: ArmStaticInst(_mnemonic, _machInst, No_OpClass)
{
// don't call execute() (which panics) if we're on a
// speculative path
flags[IsNonSpeculative] = true;
}
FailUnimplemented::FailUnimplemented(const char *_mnemonic,
ExtMachInst _machInst,
const std::string& _fullMnemonic)
: ArmStaticInst(_mnemonic, _machInst, No_OpClass),
fullMnemonic(_fullMnemonic)
{
// don't call execute() (which panics) if we're on a
// speculative path
flags[IsNonSpeculative] = true;
}
Fault
FailUnimplemented::execute(ExecContext *xc, Trace::InstRecord *traceData) const
{
return std::make_shared<UndefinedInstruction>(machInst, false, mnemonic);
}
std::string
FailUnimplemented::generateDisassembly(Addr pc, const SymbolTable *symtab) const
{
return csprintf("%-10s (unimplemented)",
fullMnemonic.size() ? fullMnemonic.c_str() : mnemonic);
}
WarnUnimplemented::WarnUnimplemented(const char *_mnemonic,
ExtMachInst _machInst)
: ArmStaticInst(_mnemonic, _machInst, No_OpClass), warned(false)
{
// don't call execute() (which panics) if we're on a
// speculative path
flags[IsNonSpeculative] = true;
}
WarnUnimplemented::WarnUnimplemented(const char *_mnemonic,
ExtMachInst _machInst,
const std::string& _fullMnemonic)
: ArmStaticInst(_mnemonic, _machInst, No_OpClass), warned(false),
fullMnemonic(_fullMnemonic)
{
// don't call execute() (which panics) if we're on a
// speculative path
flags[IsNonSpeculative] = true;
}
Fault
WarnUnimplemented::execute(ExecContext *xc, Trace::InstRecord *traceData) const
{
if (!warned) {
warn("\tinstruction '%s' unimplemented\n",
fullMnemonic.size() ? fullMnemonic.c_str() : mnemonic);
warned = true;
}
return NoFault;
}
std::string
WarnUnimplemented::generateDisassembly(Addr pc, const SymbolTable *symtab) const
{
return csprintf("%-10s (unimplemented)",
fullMnemonic.size() ? fullMnemonic.c_str() : mnemonic);
}
IllegalExecInst::IllegalExecInst(ExtMachInst _machInst)
: ArmStaticInst("Illegal Execution", _machInst, No_OpClass)
{}
Fault
IllegalExecInst::execute(ExecContext *xc, Trace::InstRecord *traceData) const
{
return std::make_shared<IllegalInstSetStateFault>();
}
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