arm.isa revision 7400:f6c9b27c4dbe
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 // bxj unimplemented, treated as bx 71 0x1,0x2: ArmBxClz::armBxClz(); 72 0x3: decode OPCODE { 73 0x9: ArmBlxReg::armBlxReg(); 74 } 75 0x5: ArmSatAddSub::armSatAddSub(); 76 } 77 0x1: ArmHalfWordMultAndMultAcc::armHalfWordMultAndMultAcc(); 78 } 79 } 80 } 81 0x1: decode IS_MISC { 82 0: ArmDataProcImm::armDataProcImm(); 83 1: decode OPCODE { 84 // The following two instructions aren't supposed to be defined 85 0x8: DataOp::movw({{ Rd = IMMED_11_0 | (RN << 12) ; }}); 86 0x9: decode RN { 87 0: decode IMM { 88 0: PredImmOp::nop({{ ; }}); 89#if FULL_SYSTEM 90 1: PredImmOp::yield({{ ; }}); 91 2: PredImmOp::wfe({{ 92 if (SevMailbox) 93 SevMailbox = 0; 94 else 95 PseudoInst::quiesce(xc->tcBase()); 96 }}, IsNonSpeculative, IsQuiesce); 97 3: PredImmOp::wfi({{ 98 PseudoInst::quiesce(xc->tcBase()); 99 }}, IsNonSpeculative, IsQuiesce); 100 4: PredImmOp::sev({{ 101 // Need a way for O3 to not scoreboard these 102 // accesses as pipeflushs 103 System *sys = xc->tcBase()->getSystemPtr(); 104 for (int x = 0; x < sys->numContexts(); x++) { 105 ThreadContext *oc = sys->getThreadContext(x); 106 oc->setMiscReg(MISCREG_SEV_MAILBOX, 1); 107 } 108 }}); 109#endif 110 } 111 default: PredImmOp::msr_i_cpsr({{ 112 SCTLR sctlr = Sctlr; 113 uint32_t newCpsr = 114 cpsrWriteByInstr(Cpsr | CondCodes, 115 rotated_imm, RN, false, sctlr.nmfi); 116 Cpsr = ~CondCodesMask & newCpsr; 117 CondCodes = CondCodesMask & newCpsr; 118 }}); 119 } 120 0xa: PredOp::movt({{ Rd = IMMED_11_0 << 16 | RN << 28 | Rd<15:0>; }}); 121 0xb: PredImmOp::msr_i_spsr({{ 122 Spsr = spsrWriteByInstr(Spsr, rotated_imm, RN, false); 123 }}); 124 } 125 } 126 0x2: AddrMode2::addrMode2(True); 127 0x3: decode OPCODE_4 { 128 0: AddrMode2::addrMode2(False); 129 1: decode OPCODE_24_23 { 130 0x0: ArmParallelAddSubtract::armParallelAddSubtract(); 131 0x1: ArmPackUnpackSatReverse::armPackUnpackSatReverse(); 132 0x2: ArmSignedMultiplies::armSignedMultiplies(); 133 0x3: ArmMiscMedia::armMiscMedia(); 134 } 135 } 136 0x4: ArmMacroMem::armMacroMem(); 137 0x5: decode OPCODE_24 { 138 0: ArmBBlxImm::armBBlxImm(); 139 1: ArmBlBlxImm::armBlBlxImm(); 140 } 141 0x6: decode CPNUM { 142 0xa, 0xb: ExtensionRegLoadStore::extensionRegLoadStore(); 143 } 144 0x7: decode OPCODE_24 { 145 0: decode OPCODE_4 { 146 0: decode CPNUM { 147 0xa, 0xb: VfpData::vfpData(); 148 } // CPNUM 149 1: decode CPNUM { // 27-24=1110,4 ==1 150 1: decode OPCODE_15_12 { 151 format FloatOp { 152 0xf: decode OPCODE_23_21 { 153 format FloatCmp { 154 0x4: cmf({{ Fn.df }}, {{ Fm.df }}); 155 0x5: cnf({{ Fn.df }}, {{ -Fm.df }}); 156 0x6: cmfe({{ Fn.df }}, {{ Fm.df}}); 157 0x7: cnfe({{ Fn.df }}, {{ -Fm.df}}); 158 } 159 } 160 default: decode OPCODE_23_20 { 161 0x0: decode OPCODE_7 { 162 0: flts({{ Fn.sf = (float) Rd.sw; }}); 163 1: fltd({{ Fn.df = (double) Rd.sw; }}); 164 } 165 0x1: decode OPCODE_7 { 166 0: fixs({{ Rd = (uint32_t) Fm.sf; }}); 167 1: fixd({{ Rd = (uint32_t) Fm.df; }}); 168 } 169 0x2: wfs({{ Fpsr = Rd; }}); 170 0x3: rfs({{ Rd = Fpsr; }}); 171 0x4: FailUnimpl::wfc(); 172 0x5: FailUnimpl::rfc(); 173 } 174 } // format FloatOp 175 } 176 0xa, 0xb: ShortFpTransfer::shortFpTransfer(); 177 0xf: McrMrc15::mcrMrc15(); 178 } // CPNUM (OP4 == 1) 179 } //OPCODE_4 180 181 1: Svc::svc(); 182 } // OPCODE_24 183 184} 185} 186} 187 188