arm.isa revision 7243:d503503b3966
1// -*- mode:c++ -*- 2 3// Copyright (c) 2010 ARM Limited 4// All rights reserved 5// 6// The license below extends only to copyright in the software and shall 7// not be construed as granting a license to any other intellectual 8// property including but not limited to intellectual property relating 9// to a hardware implementation of the functionality of the software 10// licensed hereunder. You may use the software subject to the license 11// terms below provided that you ensure that this notice is replicated 12// unmodified and in its entirety in all distributions of the software, 13// modified or unmodified, in source code or in binary form. 14// 15// Copyright (c) 2007-2008 The Florida State University 16// All rights reserved. 17// 18// Redistribution and use in source and binary forms, with or without 19// modification, are permitted provided that the following conditions are 20// met: redistributions of source code must retain the above copyright 21// notice, this list of conditions and the following disclaimer; 22// redistributions in binary form must reproduce the above copyright 23// notice, this list of conditions and the following disclaimer in the 24// documentation and/or other materials provided with the distribution; 25// neither the name of the copyright holders nor the names of its 26// contributors may be used to endorse or promote products derived from 27// this software without specific prior written permission. 28// 29// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 30// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 31// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 32// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 33// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 34// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 35// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 36// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 37// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 38// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 39// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 40// 41// Authors: Stephen Hines 42 43//////////////////////////////////////////////////////////////////// 44// 45// The actual ARM ISA decoder 46// -------------------------- 47// The following instructions are specified in the ARM ISA 48// Specification. Decoding closely follows the style specified 49// in the ARM ISA specification document starting with Table B.1 or 3-1 50// 51// 52 530: decode COND_CODE { 540xF: ArmUnconditional::armUnconditional(); 55default: decode ENCODING { 56format DataOp { 57 0x0: decode SEVEN_AND_FOUR { 58 1: decode MISC_OPCODE { 59 0x9: decode PREPOST { 60 0: ArmMultAndMultAcc::armMultAndMultAcc(); 61 1: ArmSyncMem::armSyncMem(); 62 } 63 0xb, 0xd, 0xf: AddrMode3::addrMode3(); 64 } 65 0: decode IS_MISC { 66 0: ArmDataProcReg::armDataProcReg(); 67 1: decode OPCODE_7 { 68 0x0: decode MISC_OPCODE { 69 0x0: ArmMsrMrs::armMsrMrs(); 70 0x1: decode OPCODE { 71 0x9: ArmBx::armBx(); 72 0xb: PredOp::clz({{ 73 Rd = ((Rm == 0) ? 32 : (31 - findMsbSet(Rm))); 74 }}); 75 } 76 0x2: decode OPCODE { 77 0x9: WarnUnimpl::bxj(); 78 } 79 0x3: decode OPCODE { 80 0x9: ArmBlxReg::armBlxReg(); 81 } 82 0x5: ArmSatAddSub::armSatAddSub(); 83 } 84 0x1: ArmHalfWordMultAndMultAcc::armHalfWordMultAndMultAcc(); 85 } 86 } 87 } 88 0x1: decode IS_MISC { 89 0: ArmDataProcImm::armDataProcImm(); 90 1: decode OPCODE { 91 // The following two instructions aren't supposed to be defined 92 0x8: DataOp::movw({{ Rd = IMMED_11_0 | (RN << 12) ; }}); 93 0x9: decode RN { 94 0: decode IMM { 95 0: PredImmOp::nop({{ ; }}); 96 1: WarnUnimpl::yield(); 97 2: WarnUnimpl::wfe(); 98 3: WarnUnimpl::wfi(); 99 4: WarnUnimpl::sev(); 100 } 101 default: PredImmOp::msr_i_cpsr({{ 102 uint32_t newCpsr = 103 cpsrWriteByInstr(Cpsr | CondCodes, 104 rotated_imm, RN, false); 105 Cpsr = ~CondCodesMask & newCpsr; 106 CondCodes = CondCodesMask & newCpsr; 107 }}); 108 } 109 0xa: PredOp::movt({{ Rd = IMMED_11_0 << 16 | RN << 28 | Rd<15:0>; }}); 110 0xb: PredImmOp::msr_i_spsr({{ 111 Spsr = spsrWriteByInstr(Spsr, rotated_imm, RN, false); 112 }}); 113 } 114 } 115 0x2: AddrMode2::addrMode2(True); 116 0x3: decode OPCODE_4 { 117 0: AddrMode2::addrMode2(False); 118 1: decode OPCODE_24_23 { 119 0x0: ArmParallelAddSubtract::armParallelAddSubtract(); 120 0x1: ArmPackUnpackSatReverse::armPackUnpackSatReverse(); 121 0x2: ArmSignedMultiplies::armSignedMultiplies(); 122 0x3: decode MEDIA_OPCODE { 123 0x18: ArmUsad::armUsad(); 124 } 125 } 126 } 127 0x4: ArmMacroMem::armMacroMem(); 128 0x5: decode OPCODE_24 { 129 0: ArmBBlxImm::armBBlxImm(); 130 1: ArmBlBlxImm::armBlBlxImm(); 131 } 132 0x6: decode CPNUM { 133 0xb: ExtensionRegLoadStore::extensionRegLoadStore(); 134 } 135 0x7: decode OPCODE_24 { 136 0: decode OPCODE_4 { 137 0: decode CPNUM { 138 0xa, 0xb: decode OPCODE_23_20 { 139##include "vfp.isa" 140 } 141 } // CPNUM 142 1: decode CPNUM { // 27-24=1110,4 ==1 143 1: decode OPCODE_15_12 { 144 format FloatOp { 145 0xf: decode OPCODE_23_21 { 146 format FloatCmp { 147 0x4: cmf({{ Fn.df }}, {{ Fm.df }}); 148 0x5: cnf({{ Fn.df }}, {{ -Fm.df }}); 149 0x6: cmfe({{ Fn.df }}, {{ Fm.df}}); 150 0x7: cnfe({{ Fn.df }}, {{ -Fm.df}}); 151 } 152 } 153 default: decode OPCODE_23_20 { 154 0x0: decode OPCODE_7 { 155 0: flts({{ Fn.sf = (float) Rd.sw; }}); 156 1: fltd({{ Fn.df = (double) Rd.sw; }}); 157 } 158 0x1: decode OPCODE_7 { 159 0: fixs({{ Rd = (uint32_t) Fm.sf; }}); 160 1: fixd({{ Rd = (uint32_t) Fm.df; }}); 161 } 162 0x2: wfs({{ Fpsr = Rd; }}); 163 0x3: rfs({{ Rd = Fpsr; }}); 164 0x4: FailUnimpl::wfc(); 165 0x5: FailUnimpl::rfc(); 166 } 167 } // format FloatOp 168 } 169 0xa: decode MISC_OPCODE { 170 0x1: decode MEDIA_OPCODE { 171 0xf: decode RN { 172 0x0: FloatOp::fmrx_fpsid({{ Rd = Fpsid; }}); 173 0x1: FloatOp::fmrx_fpscr({{ Rd = Fpscr; }}); 174 0x8: FloatOp::fmrx_fpexc({{ Rd = Fpexc; }}); 175 } 176 0xe: decode RN { 177 0x0: FloatOp::fmxr_fpsid({{ Fpsid = Rd; }}); 178 0x1: FloatOp::fmxr_fpscr({{ Fpscr = Rd; }}); 179 0x8: FloatOp::fmxr_fpexc({{ Fpexc = Rd; }}); 180 } 181 } // MEDIA_OPCODE (MISC_OPCODE 0x1) 182 } // MISC_OPCODE (CPNUM 0xA) 183 0xf: decode RN { 184 // Barrriers, Cache Maintence, NOPS 185 7: decode OPCODE_23_21 { 186 0: decode RM { 187 0: decode OPC2 { 188 4: decode OPCODE_20 { 189 0: PredOp::mcr_cp15_nop1({{ }}); // was wfi 190 } 191 } 192 1: WarnUnimpl::cp15_cache_maint(); 193 4: WarnUnimpl::cp15_par(); 194 5: decode OPC2 { 195 0,1: WarnUnimpl::cp15_cache_maint2(); 196 4: PredOp::cp15_isb({{ ; }}, IsMemBarrier, IsSerializeBefore); 197 6,7: WarnUnimpl::cp15_bp_maint(); 198 } 199 6: WarnUnimpl::cp15_cache_maint3(); 200 8: WarnUnimpl::cp15_va_to_pa(); 201 10: decode OPC2 { 202 1,2: WarnUnimpl::cp15_cache_maint3(); 203 4: PredOp::cp15_dsb({{ ; }}, IsMemBarrier, IsSerializeBefore); 204 5: PredOp::cp15_dmb({{ ; }}, IsMemBarrier, IsSerializeBefore); 205 } 206 11: WarnUnimpl::cp15_cache_maint4(); 207 13: decode OPC2 { 208 1: decode OPCODE_20 { 209 0: PredOp::mcr_cp15_nop2({{ }}); // was prefetch 210 } 211 } 212 14: WarnUnimpl::cp15_cache_maint5(); 213 } // RM 214 } // OPCODE_23_21 CR 215 216 // Thread ID and context ID registers 217 // Thread ID register needs cheaper access than miscreg 218 13: WarnUnimpl::mcr_mrc_cp15_c7(); 219 220 // All the rest 221 default: decode OPCODE_20 { 222 0: PredOp::mcr_cp15({{ 223 fault = setCp15Register(Rd, RN, OPCODE_23_21, RM, OPC2); 224 }}); 225 1: PredOp::mrc_cp15({{ 226 fault = readCp15Register(Rd, RN, OPCODE_23_21, RM, OPC2); 227 }}); 228 } 229 } // RN 230 } // CPNUM (OP4 == 1) 231 } //OPCODE_4 232 233 1: Svc::svc(); 234 } // OPCODE_24 235 236} 237} 238} 239 240