xref: /gem5/src/arch/arm/isa/decoder/thumb.isa

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

// Copyright (c) 2010 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) 2009 The Regents of The University of Michigan
// 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
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// Authors: Gabe Black

1: decode BIGTHUMB {
    // 16 bit thumb instructions.
    0: decode TOPCODE_15_13 {
        0x0, 0x1: Thumb16ShiftAddSubMoveCmp::thumb16ShiftAddMoveCmp();
        0x2: decode TOPCODE_12_10 {
            0x0: Thumb16DataProcessing::thumb16DataProcessing();
            0x1: Thumb16SpecDataAndBx::thumb16SpecDataAndBx();
            0x2, 0x3: Thumb16MemLit::thumb16MemLit();
            default: Thumb16MemReg::thumb16MemReg();
        }
        0x3, 0x4: Thumb16MemImm::thumb16MemImm();
        0x5: decode TOPCODE_12_11 {
            0x0: Thumb16Adr::thumb16Adr();
            0x1: Thumb16AddSp::thumb16AddSp(); //sp, immediate
            0x2, 0x3: Thumb16Misc::thumb16Misc();
        }
        0x6: decode TOPCODE_12_11 {
            0x0, 0x1: Thumb16MacroMem::thumb16MacroMem();
            default: decode TOPCODE_11_8 {
                0xe: WarnUnimpl::undefined(); // permanently undefined
                0xf: WarnUnimpl::svc(); // formerly swi
                default: WarnUnimpl::b(); // conditional
            }
        }
        0x7: decode TOPCODE_12_11 {
            0x0: WarnUnimpl::b(); // unconditional
        }
    }

    // 32 bit thumb instructions.
    1: decode HTOPCODE_12_11 {
        0x1: decode HTOPCODE_10_9 {
            0x0: decode HTOPCODE_8_6 {
                0x0, 0x6: decode HTOPCODE_4 {
                    0x0: WarnUnimpl::srs();
                    0x1: WarnUnimpl::rfe();
                }
                0x1: decode HTOPCODE_5_4 {
                    0x0: WarnUnimpl::strex();
                    0x1: WarnUnimpl::ldrex();
                    0x2: WarnUnimpl::strd(); // immediate
                    0x3: decode HTRN {
                        0xf: WarnUnimpl::ldrd(); // literal
                        default: WarnUnimpl::ldrd(); // immediate
                    }
                }
                // This uses the same encoding as regular ARM.
                0x2: ArmMacroMem::armMacroMem();
                0x3: decode HTOPCODE_5_4 {
                    0x0: decode LTOPCODE_7_4 {
                        0x4: WarnUnimpl::strexb();
                        0x5: WarnUnimpl::strexh();
                        0x7: WarnUnimpl::strexd();
                    }
                    0x1: decode LTOPCODE_7_4 {
                        0x0: WarnUnimpl::tbb();
                        0x1: WarnUnimpl::tbh();
                        0x4: WarnUnimpl::ldrexb();
                        0x5: WarnUnimpl::ldrexh();
                        0x7: WarnUnimpl::ldrexd();
                    }
                    0x2: WarnUnimpl::strd(); // immediate
                    0x3: decode HTRN {
                        0xf: WarnUnimpl::ldrd(); // literal
                        default: WarnUnimpl::ldrd(); // immediate
                    }
                }
                // This uses the same encoding as regular ARM.
                0x4: ArmMacroMem::armMacroMem();
                0x5, 0x7: decode HTOPCODE_4 {
                    0x0: WarnUnimpl::strd(); // immediate
                    0x1: decode HTRN {
                        0xf: WarnUnimpl::ldrd(); // literal
                        default: WarnUnimpl::ldrd(); // immediate
                    }
                }
            }
            0x1: Thumb32DataProcShiftReg::thumb32DataProcShiftReg();
            default: decode HTOPCODE_9_8 {
                0x2: decode LTOPCODE_4 {
                    0x0: decode LTCOPROC {
                        0xa, 0xb: decode OPCODE_23_20 {
##include "vfp.isa"
                        }
                        default: WarnUnimpl::cdp(); // cdp2
                    }
                    0x1: decode LTCOPROC {
                        0xa, 0xb: WarnUnimpl::Core_to_extension_transfer();
                        default: decode HTOPCODE_4 {
                            0x0: WarnUnimpl::mcr(); // mcr2
                            0x1: WarnUnimpl::mrc(); // mrc2
                        }
                    }
                }
                0x3: WarnUnimpl::Advanced_SIMD();
                default: decode LTCOPROC {
                    0xa, 0xb: decode HTOPCODE_9_4 {
                        0x00: WarnUnimpl::undefined();
                        0x04: WarnUnimpl::mcrr(); // mcrr2
                        0x05: WarnUnimpl::mrrc(); // mrrc2
                        0x02, 0x06, 0x08, 0x0a, 0x0c, 0x0e, 0x10,
                        0x12, 0x14, 0x16, 0x18, 0x1a, 0x1c, 0x1e:
                            WarnUnimpl::stc(); // stc2
                        0x03, 0x07, 0x09, 0x0b, 0x0d, 0x0f, 0x11,
                        0x13, 0x15, 0x17, 0x19, 0x1b, 0x1d, 0x1f:
                            decode HTRN {
                                0xf: WarnUnimpl::ldc(); // ldc2 (literal)
                                default: WarnUnimpl::ldc(); // ldc2 (immediate)
                            }
                    }
                    default: decode HTOPCODE_9_5 {
                        0x00: WarnUnimpl::undefined();
                        0x02: WarnUnimpl::SIMD_VFP_64_bit_core_extension_transfer();
                        0x01, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
                        0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f:
                            WarnUnimpl::Extension_register_load_store_instruction();
                    }
                }
            }
        }
        0x2: decode LTOPCODE_15 {
            0x0: decode HTOPCODE_9 {
                0x0: Thumb32DataProcModImm::thumb32DataProcModImm();
                0x1: WarnUnimpl::Data_processing_plain_binary_immediate();
            }
            0x1: WarnUnimpl::Branches_and_miscellaneous_control();
        }
        0x3: decode HTOPCODE_10_9 {
            0x0: decode HTOPCODE_4 {
                0x0: decode HTOPCODE_8 {
                    0x0: Thumb32StoreSingle::thumb32StoreSingle();
                    0x1: WarnUnimpl::Advanced_SIMD_or_structure_load_store();
                }
                0x1: decode HTOPCODE_6_5 {
                    0x0: WarnUnimpl::Load_byte_memory_hints();
                    0x1: WarnUnimpl::Load_halfword_memory_hints();
                    0x2: Thumb32LoadWord::thumb32LoadWord();
                    0x3: WarnUnimpl::undefined();
                }
            }
            0x1: decode HTOPCODE_8_7 {
                0x2: WarnUnimpl::Multiply_multiply_accumulate_and_absolute_difference();
                0x3: WarnUnimpl::Long_multiply_long_multiply_accumulate_and_divide();
                default: WarnUnimpl::Data_processing_register();
            }
            default: decode HTOPCODE_9_8 {
                0x2: decode LTOPCODE_4 {
                    0x0: decode LTCOPROC {
                        0xa, 0xb: WarnUnimpl::VFP_Inst();
                        default: WarnUnimpl::cdp(); // cdp2
                    }
                    0x1: decode LTCOPROC {
                        0xa, 0xb: WarnUnimpl::Core_to_extension_transfer();
                        default: decode HTOPCODE_4 {
                            0x0: WarnUnimpl::mcr(); // mcr2
                            0x1: WarnUnimpl::mrc(); // mrc2
                        }
                    }
                }
                0x3: WarnUnimpl::Advanced_SIMD();
                default: decode LTCOPROC {
                    0xa, 0xb: decode HTOPCODE_9_4 {
                        0x00: WarnUnimpl::undefined();
                        0x04: WarnUnimpl::mcrr(); // mcrr2
                        0x05: WarnUnimpl::mrrc(); // mrrc2
                        0x02, 0x06, 0x08, 0x0a, 0x0c, 0x0e, 0x10,
                        0x12, 0x14, 0x16, 0x18, 0x1a, 0x1c, 0x1e:
                            WarnUnimpl::stc(); // stc2
                        0x03, 0x07, 0x09, 0x0b, 0x0d, 0x0f, 0x11,
                        0x13, 0x15, 0x17, 0x19, 0x1b, 0x1d, 0x1f:
                            decode HTRN {
                                0xf: WarnUnimpl::ldc(); // ldc2 (literal)
                                default: WarnUnimpl::ldc(); // ldc2 (immediate)
                            }
                    }
                    default: decode HTOPCODE_9_5 {
                        0x00: WarnUnimpl::undefined();
                        0x02: WarnUnimpl::SIMD_VFP_64_bit_core_extension_transfer();
                        0x01, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
                        0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f:
                            WarnUnimpl::Extension_register_load_store_instruction();
                    }
                }
            }
        }
    }
}