xref: /gem5/src/arch/arm/isa/formats/breakpoint.isa

// -*- mode:c++ -*-

// Copyright (c) 2010,2018 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: Stephen Hines

////////////////////////////////////////////////////////////////////
//
// Breakpoint instructions
//

output header {{
    /**
     * Static instruction class for Breakpoint (illegal) instructions.
     * These cause simulator termination if they are executed in a
     * non-speculative mode.  This is a leaf class.
     */
    class Breakpoint : public ArmStaticInst
    {
      public:
        /// Constructor
        Breakpoint(ExtMachInst _machInst)
            : ArmStaticInst("Breakpoint", _machInst, No_OpClass)
        {
            // don't call execute() (which panics) if we're on a
            // speculative path
            flags[IsNonSpeculative] = true;
        }

        Fault execute(ExecContext *, Trace::InstRecord *) const override;

        std::string
        generateDisassembly(Addr pc, const SymbolTable *symtab) const override;
    };
}};

output decoder {{
    std::string
    Breakpoint::generateDisassembly(Addr pc, const SymbolTable *symtab) const
    {
        return csprintf("%-10s (inst 0x%x)", "Breakpoint", machInst);
    }
}};

output exec {{
    Fault
    Breakpoint::execute(ExecContext *xc, Trace::InstRecord *traceData) const
    {
        return std::make_shared<PrefetchAbort>(xc->pcState().pc(),
                                               ArmFault::DebugEvent);
    }
}};

def format ArmBkptHlt() {{
    decode_block = '''
    {
        if (bits(machInst, 21)) {
            return new Breakpoint(machInst);
        } else {
            uint32_t imm16 = (bits(machInst, 19, 8) << 4) |
                             (bits(machInst,  3, 0) << 0);
            return new Hlt(machInst, imm16);
        }
    }
    '''
}};