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

// 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.
//
// 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
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Authors: Gabe Black

def format ArmUnconditional() {{
    decode_block = '''
    {
        const IntRegIndex rn = (IntRegIndex)(uint32_t)bits(machInst, 19, 16);
        const uint32_t op1 = bits(machInst, 27, 20);
        if (bits(op1, 7) == 0) {
            const uint32_t op2 = bits(machInst, 7, 4);
            if (op1 == 0x10) {
                if (bits((uint32_t)rn, 0) == 1 && op2 == 0) {
                    return new WarnUnimplemented("setend", machInst);
                } else if (bits((uint32_t)rn, 0) == 0 && bits(op2, 1) == 0) {
                    return new WarnUnimplemented("cps", machInst);
                }
            } else if (bits(op1, 6, 5) == 0x1) {
                return new WarnUnimplemented(
                        "Advanced SIMD data-processing", machInst);
            } else if (bits(op1, 6, 4) == 0x4) {
                if (bits(op1, 0) == 0) {
                    return new WarnUnimplemented(
                            "Advanced SIMD element or structure load/store",
                            machInst);
                } else if (bits(op1, 2, 0) == 1) {
                    // Unallocated memory hint
                    return new WarnUnimplemented("nop", machInst);
                } else if (bits(op1, 2, 0) == 5) {
                    return new WarnUnimplemented("pli", machInst);
                }
            } else if (bits(op1, 6, 4) == 0x5) {
                if (bits(op1, 1, 0) == 0x1) {
                    return new WarnUnimplemented("pld", machInst);
                } else if (op1 == 0x57) {
                    switch (op2) {
                      case 0x1:
                        return new WarnUnimplemented("clrex", machInst);
                      case 0x4:
                        return new WarnUnimplemented("dsb", machInst);
                      case 0x5:
                        return new WarnUnimplemented("dmb", machInst);
                      case 0x6:
                        return new WarnUnimplemented("isb", machInst);
                    }
                }
            } else if (bits(op2, 0) == 0) {
                switch (op1 & 0xf7) {
                  case 0x61:
                    // Unallocated memory hint
                    return new WarnUnimplemented("nop", machInst);
                  case 0x65:
                    return new WarnUnimplemented("pli", machInst);
                  case 0x71:
                    return new WarnUnimplemented("pld", machInst);
                }
            }
        } else {
            switch (bits(machInst, 26, 25)) {
              case 0x0:
                {
                    const uint32_t val = ((machInst >> 20) & 0x5);
                    if (val == 0x4) {
                        return new WarnUnimplemented("srs", machInst);
                    } else if (val == 0x1) {
                        return new WarnUnimplemented("rfe", machInst);
                    }
                }
                break;
              case 0x1:
                {
                    const uint32_t imm =
                        (sext<26>(bits(machInst, 23, 0) << 2)) |
                        (bits(machInst, 24) << 1);
                    return new BlxImm(machInst, imm);
                }
              case 0x2:
                if (bits(op1, 0) == 1) {
                    if (rn == INTREG_PC) {
                        if (bits(op1, 4, 3) != 0x0) {
                            return new WarnUnimplemented(
                                    "ldc, ldc2 (literal)", machInst);
                        }
                    } else {
                        if (op1 == 0xC3 || op1 == 0xC7) {
                            return new WarnUnimplemented(
                                    "ldc, ldc2 (immediate)", machInst);
                        }
                    }
                    if (op1 == 0xC5) {
                        return new WarnUnimplemented("mrrc, mrrc2", machInst);
                    }
                } else {
                    if (bits(op1, 4, 3) != 0 || bits(op1, 1) == 1) {
                        return new WarnUnimplemented("stc, stc2", machInst);
                    } else if (op1 == 0xC4) {
                        return new WarnUnimplemented("mcrr, mcrrc", machInst);
                    }
                }
                break;
              case 0x3:
                {
                    const bool op = bits(machInst, 4);
                    if (op) {
                        if (bits(op1, 0)) {
                            return new WarnUnimplemented(
                                    "mrc, mrc2", machInst);
                        } else {
                            return new WarnUnimplemented(
                                    "mcr, mcr2", machInst);
                        }
                    } else {
                        return new WarnUnimplemented("cdp, cdp2", machInst);
                    }
                }
                break;
            }
        }
        return new Unknown(machInst);
    }
    '''
}};