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: decode TOPCODE_13_11 {
            0x0: WarnUnimpl::lsl(); //immediate
            0x1: WarnUnimpl::lsr(); //immediate
            0x2: WarnUnimpl::asr(); //immediate
            0x3: decode TOPCODE_10_9 {
                0x0: WarnUnimpl::add(); //register
                0x1: WarnUnimpl::sub(); //register
                0x2: WarnUnimpl::add(); //3 bit immediate
                0x3: WarnUnimpl::sub(); //3 bit immediate
            }
            0x4: WarnUnimpl::mov(); //immediate
            0x5: WarnUnimpl::cmp(); //immediate
            0x6: WarnUnimpl::add(); //8 bit immediate, thumb
            0x7: WarnUnimpl::sub(); //8 bit immediate, thumb
        }
        0x2: decode TOPCODE_12_10 {
            // Data processing
            0x0: decode TOPCODE_9_6 {
                0x0: WarnUnimpl::and(); //register
                0x1: WarnUnimpl::eor(); //register
                0x2: WarnUnimpl::lsl(); //register
                0x3: WarnUnimpl::lsr(); //register
                0x4: WarnUnimpl::asr(); //register
                0x5: WarnUnimpl::adc(); //register
                0x6: WarnUnimpl::sbc(); //register
                0x7: WarnUnimpl::ror(); //register
                0x8: WarnUnimpl::tst(); //register
                0x9: WarnUnimpl::rsb(); //immediate
                0xa: WarnUnimpl::cmp(); //register (high registers)
                0xb: WarnUnimpl::cmn(); //register
                0xc: WarnUnimpl::orr(); //register
                0xd: WarnUnimpl::mul();
                0xe: WarnUnimpl::bic(); //register
                0xf: WarnUnimpl::mvn(); //register
            }
            // Special data instructions and branch and exchange
            0x1: decode TOPCODE_9_6 {
                0x0: WarnUnimpl::add(); //register (low registers)
                0x1, 0x2, 0x3: WarnUnimpl::add(); //register (high registers)
                0x4: WarnUnimpl::unpredictable(); //?
                0x5, 0x6, 0x7: WarnUnimpl::cmp(); //register
                0x8: WarnUnimpl::mov(); //register (low registers)
                0x9, 0xa, 0xb: WarnUnimpl::mov(); //register (high registers)
                0xc, 0xd: WarnUnimpl::bx();
                0xe, 0xf: WarnUnimpl::blx(); //register
            }
            0x2, 0x3: WarnUnimpl::ldr();
            default: decode TOPCODE_11_9 {
                0x0: WarnUnimpl::str(); //register
                0x1: WarnUnimpl::strh(); //register
                0x2: WarnUnimpl::strb(); //register
                0x3: WarnUnimpl::ldrsb(); //register
                0x4: WarnUnimpl::ldr(); //register
                0x5: WarnUnimpl::ldrh(); //register
                0x6: WarnUnimpl::ldrb(); //register
                0x7: WarnUnimpl::ldrsh(); //register
            }
        }
        0x3: decode TOPCODE_12_11 {
            0x0: WarnUnimpl::str(); //immediate, thumb
            0x1: WarnUnimpl::ldr(); //immediate, thumb
            0x2: WarnUnimpl::strb(); //immediate, thumb
            0x3: WarnUnimpl::ldrb(); //immediate, thumb
        }
        0x4: decode TOPCODE_12_11 {
            0x0: WarnUnimpl::strh(); //immediate, thumb
            0x1: WarnUnimpl::ldrh(); //immediate, thumb
            0x2: WarnUnimpl::str(); //immediate, thumb
            0x3: WarnUnimpl::ldr(); //immediate, thumb
        }
        0x5: decode TOPCODE_12_11 {
            0x0: WarnUnimpl::adr();
            0x1: WarnUnimpl::add(); //sp, immediate
            0x2: decode TOPCODE_10_8 {
                0x0: decode TOPCODE_7 {
                    0x0: WarnUnimpl::add(); //sp, immediate
                    0x1: WarnUnimpl::sub(); //sp, immediate
                }
                0x1, 0x3: WarnUnimpl::cbz(); //cbnz too...
                0x2: decode TOPCODE_7_6 {
                    0x0: WarnUnimpl::sxth();
                    0x1: WarnUnimpl::sxtb();
                    0x2: WarnUnimpl::uxth();
                    0x3: WarnUnimpl::uxtb();
                }
                0x4, 0x5: WarnUnimpl::pop();
                0x6: decode TOPCODE_7_5 {
                    0x2: WarnUnimpl::setend();
                    0x3: WarnUnimpl::cps();
                }
            }
            0x3: decode TOPCODE_10_8 {
                0x1, 0x3: WarnUnimpl::cbz(); //cbnz too...
                0x2: decode TOPCODE_7_6 {
                    0x0: WarnUnimpl::rev();
                    0x1: WarnUnimpl::rev16();
                    0x3: WarnUnimpl::revsh();
                }
                0x4, 0x5: WarnUnimpl::pop();
                0x6: WarnUnimpl::bkpt();
                0x7: decode TOPCODE_3_0 {
                    0x0: WarnUnimpl::it();
                    default: decode TOPCODE_7_4 {
                        0x0: WarnUnimpl::nop();
                        0x1: WarnUnimpl::yield();
                        0x2: WarnUnimpl::wfe();
                        0x3: WarnUnimpl::wfi();
                        0x4: WarnUnimpl::sev();
                        default: WarnUnimpl::unallocated_hint();
                    }
                }
            }
        }
        0x6: decode TOPCODE_12_11 {
            0x0: WarnUnimpl::stm(); // also stmia, stmea
            0x1: WarnUnimpl::ldm(); // also ldmia, ldmea
            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
                    }
                }
                0x2: decode HTOPCODE_4 {
                    0x0: WarnUnimpl::stm(); // stmia, stmea
                    0x1: decode HTRN {
                        0xd: WarnUnimpl::pop();
                        default: WarnUnimpl::ldm(); // ldmia, ldmfd
                    }
                }
                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
                    }
                }
                0x4: decode HTOPCODE_4 {
                    0x0: decode HTRN {
                        0xd: WarnUnimpl::push();
                        default: WarnUnimpl::stmdb(); // stmfd
                    }
                    0x1: WarnUnimpl::ldmdb(); // ldmea
                }
                0x5, 0x7: decode HTOPCODE_4 {
                    0x0: WarnUnimpl::strd(); // immediate
                    0x1: decode HTRN {
                        0xf: WarnUnimpl::ldrd(); // literal
                        default: WarnUnimpl::ldrd(); // immediate
                    }
                }
            }
            0x1: decode HTOPCODE_8_5 {
                0x0: decode LTRD {
                    0xf: decode HTS {
                        0x1: WarnUnimpl::tst(); // register
                    }
                    default: WarnUnimpl::and(); // register
                }
                0x1: WarnUnimpl::bic(); // register
                0x2: decode HTRN {
                    0xf: WarnUnimpl::mov(); // register
                    default: WarnUnimpl::orr(); // register
                }
                0x3: decode HTRN {
                    0xf: WarnUnimpl::mvn(); // register
                    default: WarnUnimpl::orn(); // register
                }
                0x4: decode LTRD {
                    0xf: decode HTS {
                        0x1: WarnUnimpl::teq(); // register
                    }
                    default: WarnUnimpl::eor(); // register
                }
                0x6: WarnUnimpl::pkh();
                0x8: decode LTRD {
                    0xf: decode HTS {
                        0x1: WarnUnimpl::cmn(); // register
                    }
                    default: WarnUnimpl::add(); // register
                }
                0xa: WarnUnimpl::adc(); // register
                0xb: WarnUnimpl::sbc(); // register
                0xd: decode LTRD {
                    0xf: decode HTS {
                        0x1: WarnUnimpl::cmp(); // register
                    }
                    default: WarnUnimpl::sub(); // register
                }
                0xe: WarnUnimpl::rsb(); // register
            }
            default: decode HTOPCODE_9_8 {
                0x2: decode LTOPCODE_4 {
                    0x0: decode LTCOPROC {
                        0xa, 0xb: decode OPCODE_23_20 {
##include "vfpdecode.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: decode HTOPCODE_8_5 {
                    0x0: decode LTRD {
                        0xf: decode HTS {
                            0x1: DataModImmOp::tst({{
                                resTemp = Rn & rotated_imm;
                            }});
                        }
                        default: DataModImmOp::and({{
                            Rs = resTemp = Rn & rotated_imm;
                        }});
                    }
                    0x1: DataModImmOp::bic({{
                        Rs = resTemp = Rn & ~rotated_imm;
                    }});
                    0x2: decode HTRN {
                        0xf: DataModImmOp::mov({{
                            Rs = resTemp = rotated_imm;
                        }});
                        default: DataModImmOp::orr({{
                            Rs = resTemp = Rn | rotated_imm;
                        }});
                    }
                    0x3: decode HTRN {
                        0xf: DataModImmOp::mvn({{
                            Rs = resTemp = ~rotated_imm;
                        }});
                        default: DataModImmOp::orn({{
                            Rs = resTemp = Rn | ~rotated_imm;
                        }});
                    }
                    0x4: decode LTRD {
                        0xf: decode HTS {
                            0x1: DataModImmOp::teq({{
                                resTemp = Rn ^ rotated_imm;
                            }});
                        }
                        default: DataModImmOp::eor({{
                            Rs = resTemp = Rn ^ rotated_imm;
                        }});
                    }
                    0x8: decode LTRD {
                        0xf: decode HTS {
                            0x1: DataModImmOp::cmn({{
                                resTemp = Rn + rotated_imm;
                            }}, add);
                        }
                        default: DataModImmOp::add({{
                            Rs = resTemp = Rn + rotated_imm;
                        }}, add);
                    }
                    0xa: DataModImmOp::adc({{
                        Rs = resTemp = Rn + rotated_imm + CondCodes<29:>;
                    }}, add);
                    0xb: DataModImmOp::sbc({{
                        Rs = resTemp = Rn - rotated_imm - !CondCodes<29:>;
                    }}, sub);
                    0xd: decode LTRD {
                        0xf: decode HTS {
                            0x1: DataModImmOp::cmp({{
                                resTemp = Rn - rotated_imm;
                            }}, sub);
                        }
                        default: DataModImmOp::sub({{
                            Rs = resTemp = Rn - rotated_imm;
                        }}, sub);
                    }
                    0xe: DataModImmOp::rsb({{
                        Rs = resTemp = rotated_imm - Rn;
                    }}, rsb);
                }
                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: WarnUnimpl::Store_single_data_item();
                    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: decode HTOPCODE_8 {
                        0x0: decode HTRN {
                            0xf: WarnUnimpl::ldr(); // literal A8-122
                            default: decode HTOPCODE_7 {
                                0x0: decode LTOPCODE_11_8 {
                                    0x0: decode LTOPCODE_7_6 {
                                        0x0: WarnUnimpl::ldr(); // register A8-122
                                    }
                                    0x9, 0xb, 0xc, 0xd, 0xf:
                                        WarnUnimpl::ldr(); // immediate thumb A8-118
                                    0xe: WarnUnimpl::ldrt(); // A8-176
                                }
                                0x1: WarnUnimpl::ldr(); // immediate thumb A8-118
                            }
                        }
                    }
                    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();
                    }
                }
            }
        }
    }
}