breakpoint.isa revision 12542 
1// -*- mode:c++ -*-
2
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15// Copyright (c) 2007-2008 The Florida State University
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40//
41// Authors: Stephen Hines
42
43////////////////////////////////////////////////////////////////////
44//
45// Breakpoint instructions
46//
47
48output header {{
49    /**
50     * Static instruction class for Breakpoint (illegal) instructions.
51     * These cause simulator termination if they are executed in a
52     * non-speculative mode.  This is a leaf class.
53     */
54    class Breakpoint : public ArmStaticInst
55    {
56      public:
57        /// Constructor
58        Breakpoint(ExtMachInst _machInst)
59            : ArmStaticInst("Breakpoint", _machInst, No_OpClass)
60        {
61            // don't call execute() (which panics) if we're on a
62            // speculative path
63            flags[IsNonSpeculative] = true;
64        }
65
66        Fault execute(ExecContext *, Trace::InstRecord *) const;
67
68        std::string
69        generateDisassembly(Addr pc, const SymbolTable *symtab) const;
70    };
71}};
72
73output decoder {{
74    std::string
75    Breakpoint::generateDisassembly(Addr pc, const SymbolTable *symtab) const
76    {
77        return csprintf("%-10s (inst 0x%x)", "Breakpoint", machInst);
78    }
79}};
80
81output exec {{
82    Fault
83    Breakpoint::execute(ExecContext *xc, Trace::InstRecord *traceData) const
84    {
85        return std::make_shared<PrefetchAbort>(xc->pcState().pc(),
86                                               ArmFault::DebugEvent);
87    }
88}};
89
90def format ArmBkptHlt() {{
91    decode_block = '''
92    {
93        if (bits(machInst, 21)) {
94            return new Breakpoint(machInst);
95        } else {
96            uint32_t imm16 = (bits(machInst, 19, 8) << 4) |
97                             (bits(machInst,  3, 0) << 0);
98            return new Hlt(machInst, imm16);
99        }
100    }
101    '''
102}};
103
104