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.
//
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// 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,
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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();
            0x2, 0x3: Thumb16CondBranchAndSvc::thumb16CondBranchAndSvc();
        }
        0x7: decode TOPCODE_12_11 {
            0x0: Thumb16UncondBranch::thumb16UncondBranch();
        }
    }

    // 32 bit thumb instructions.
    1: decode HTOPCODE_12_11 {
        0x1: decode HTOPCODE_10_9 {
            0x0: decode HTOPCODE_6 {
                0x0: decode HTOPCODE_8_7 {
                    0x0, 0x3: Thumb32SrsRfe::thumb32SrsRfe();
                    // This uses the same encoding as regular ARM.
                    default: ArmMacroMem::armMacroMem();
                }
                0x1: Thumb32LdrStrDExTbh::thumb32LdrStrDExTbh();
            }
            0x1: Thumb32DataProcShiftReg::thumb32DataProcShiftReg();
            default: decode HTOPCODE_9_8 {
                0x2: decode LTOPCODE_4 {
                    0x0: decode LTCOPROC {
                        0xa, 0xb: VfpData::vfpData();
                        default: WarnUnimpl::cdp(); // cdp2
                    }
                    0x1: decode LTCOPROC {
                        0xa, 0xb: ShortFpTransfer::shortFpTransfer();
                        0xf: McrMrc15::mcrMrc15();
                    }
                }
                0x3: WarnUnimpl::Advanced_SIMD();
                default: decode LTCOPROC {
                    0xa, 0xb: ExtensionRegLoadStore::extensionRegLoadStre();
                    0xf: decode HTOPCODE_9_4 {
                        0x00: Unknown::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)
                            }
                    }
                }
            }
        }
        0x2: decode LTOPCODE_15 {
            0x0: decode HTOPCODE_9 {
                0x0: Thumb32DataProcModImm::thumb32DataProcModImm();
                0x1: Thumb32DataProcPlainBin::thumb32DataProcPlainBin();
            }
            0x1: Thumb32BranchesAndMiscCtrl::thumb32BranchesAndMiscCtrl();
        }
        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: LoadByteMemoryHints::loadByteMemoryHints();
                    0x1: LoadHalfwordMemoryHints::loadHalfwordMemoryHints();
                    0x2: Thumb32LoadWord::thumb32LoadWord();
                    0x3: Unknown::undefined();
                }
            }
            0x1: decode HTOPCODE_8_7 {
                0x2: Thumb32MulMulAccAndAbsDiff::thumb32MulMulAccAndAbsDiff();
                0x3: Thumb32LongMulMulAccAndDiv::thumb32LongMulMulAccAndDiv();
                default: Thumb32DataProcReg::thumb32DataProcReg();
            }
            default: decode HTOPCODE_9_8 {
                0x2: decode LTOPCODE_4 {
                    0x0: decode LTCOPROC {
                        0xa, 0xb: VfpData::vfpData();
                        default: WarnUnimpl::cdp(); // cdp2
                    }
                    0x1: decode LTCOPROC {
                        0xa, 0xb: ShortFpTransfer::shortFpTransfer();
                        0xf: McrMrc15::mcrMrc15();
                    }
                }
                0x3: WarnUnimpl::Advanced_SIMD();
                default: decode LTCOPROC {
                    0xa, 0xb: ExtensionRegLoadStore::extensionRegLoadStre();
                    0xf: decode HTOPCODE_9_4 {
                        0x00: Unknown::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)
                            }
                    }
                }
            }
        }
    }
}