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

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

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// 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;

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

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);
        }
    }
    '''
}};