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// -*- 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) 2007-2008 The Florida State University
// All rights reserved.
//
// 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: Stephen Hines
////////////////////////////////////////////////////////////////////
//
// The actual ARM ISA decoder
// --------------------------
// The following instructions are specified in the ARM ISA
// Specification. Decoding closely follows the style specified
// in the ARM ISA specification document starting with Table B.1 or 3-1
//
//
0: decode COND_CODE {
0xF: ArmUnconditional::armUnconditional();
default: decode ENCODING {
format DataOp {
0x0: decode SEVEN_AND_FOUR {
1: decode MISC_OPCODE {
0x9: decode PREPOST {
0: ArmMultAndMultAcc::armMultAndMultAcc();
1: ArmSyncMem::armSyncMem();
}
0xb, 0xd, 0xf: AddrMode3::addrMode3();
}
0: decode IS_MISC {
0: ArmDataProcReg::armDataProcReg();
1: decode OPCODE_7 {
0x0: decode MISC_OPCODE {
0x0: ArmMsrMrs::armMsrMrs();
0x1: decode OPCODE {
0x9: ArmBx::armBx();
0xb: PredOp::clz({{
Rd = ((Rm == 0) ? 32 : (31 - findMsbSet(Rm)));
}});
}
0x2: decode OPCODE {
0x9: WarnUnimpl::bxj();
}
0x3: decode OPCODE {
0x9: ArmBlxReg::armBlxReg();
}
0x5: ArmSatAddSub::armSatAddSub();
}
0x1: ArmHalfWordMultAndMultAcc::armHalfWordMultAndMultAcc();
}
}
}
0x1: decode IS_MISC {
0: ArmDataProcImm::armDataProcImm();
1: decode OPCODE {
// The following two instructions aren't supposed to be defined
0x8: DataOp::movw({{ Rd = IMMED_11_0 | (RN << 12) ; }});
0x9: decode RN {
0: decode IMM {
0: PredImmOp::nop({{ ; }});
1: WarnUnimpl::yield();
2: WarnUnimpl::wfe();
3: WarnUnimpl::wfi();
4: WarnUnimpl::sev();
}
default: PredImmOp::msr_i_cpsr({{
uint32_t newCpsr =
cpsrWriteByInstr(Cpsr | CondCodes,
rotated_imm, RN, false);
Cpsr = ~CondCodesMask & newCpsr;
CondCodes = CondCodesMask & newCpsr;
}});
}
0xa: PredOp::movt({{ Rd = IMMED_11_0 << 16 | RN << 28 | Rd<15:0>; }});
0xb: PredImmOp::msr_i_spsr({{
Spsr = spsrWriteByInstr(Spsr, rotated_imm, RN, false);
}});
}
}
0x2: AddrMode2::addrMode2(True);
0x3: decode OPCODE_4 {
0: AddrMode2::addrMode2(False);
1: decode OPCODE_24_23 {
0x0: ArmParallelAddSubtract::armParallelAddSubtract();
0x1: ArmPackUnpackSatReverse::armPackUnpackSatReverse();
0x2: ArmSignedMultiplies::armSignedMultiplies();
0x3: decode MEDIA_OPCODE {
0x18: ArmUsad::armUsad();
}
}
}
0x4: ArmMacroMem::armMacroMem();
0x5: decode OPCODE_24 {
0: ArmBBlxImm::armBBlxImm();
1: ArmBlBlxImm::armBlBlxImm();
}
0x6: decode CPNUM {
0xb: ExtensionRegLoadStore::extensionRegLoadStore();
}
0x7: decode OPCODE_24 {
0: decode OPCODE_4 {
0: decode CPNUM {
0xa, 0xb: decode OPCODE_23_20 {
##include "vfp.isa"
}
} // CPNUM
1: decode CPNUM { // 27-24=1110,4 ==1
1: decode OPCODE_15_12 {
format FloatOp {
0xf: decode OPCODE_23_21 {
format FloatCmp {
0x4: cmf({{ Fn.df }}, {{ Fm.df }});
0x5: cnf({{ Fn.df }}, {{ -Fm.df }});
0x6: cmfe({{ Fn.df }}, {{ Fm.df}});
0x7: cnfe({{ Fn.df }}, {{ -Fm.df}});
}
}
default: decode OPCODE_23_20 {
0x0: decode OPCODE_7 {
0: flts({{ Fn.sf = (float) Rd.sw; }});
1: fltd({{ Fn.df = (double) Rd.sw; }});
}
0x1: decode OPCODE_7 {
0: fixs({{ Rd = (uint32_t) Fm.sf; }});
1: fixd({{ Rd = (uint32_t) Fm.df; }});
}
0x2: wfs({{ Fpsr = Rd; }});
0x3: rfs({{ Rd = Fpsr; }});
0x4: FailUnimpl::wfc();
0x5: FailUnimpl::rfc();
}
} // format FloatOp
}
0xa: decode MISC_OPCODE {
0x1: decode MEDIA_OPCODE {
0xf: decode RN {
0x0: FloatOp::fmrx_fpsid({{ Rd = Fpsid; }});
0x1: FloatOp::fmrx_fpscr({{ Rd = Fpscr; }});
0x8: FloatOp::fmrx_fpexc({{ Rd = Fpexc; }});
}
0xe: decode RN {
0x0: FloatOp::fmxr_fpsid({{ Fpsid = Rd; }});
0x1: FloatOp::fmxr_fpscr({{ Fpscr = Rd; }});
0x8: FloatOp::fmxr_fpexc({{ Fpexc = Rd; }});
}
} // MEDIA_OPCODE (MISC_OPCODE 0x1)
} // MISC_OPCODE (CPNUM 0xA)
0xf: decode RN {
// Barrriers, Cache Maintence, NOPS
7: decode OPCODE_23_21 {
0: decode RM {
0: decode OPC2 {
4: decode OPCODE_20 {
0: PredOp::mcr_cp15_nop1({{ }}); // was wfi
}
}
1: WarnUnimpl::cp15_cache_maint();
4: WarnUnimpl::cp15_par();
5: decode OPC2 {
0,1: WarnUnimpl::cp15_cache_maint2();
4: PredOp::cp15_isb({{ ; }}, IsMemBarrier, IsSerializeBefore);
6,7: WarnUnimpl::cp15_bp_maint();
}
6: WarnUnimpl::cp15_cache_maint3();
8: WarnUnimpl::cp15_va_to_pa();
10: decode OPC2 {
1,2: WarnUnimpl::cp15_cache_maint3();
4: PredOp::cp15_dsb({{ ; }}, IsMemBarrier, IsSerializeBefore);
5: PredOp::cp15_dmb({{ ; }}, IsMemBarrier, IsSerializeBefore);
}
11: WarnUnimpl::cp15_cache_maint4();
13: decode OPC2 {
1: decode OPCODE_20 {
0: PredOp::mcr_cp15_nop2({{ }}); // was prefetch
}
}
14: WarnUnimpl::cp15_cache_maint5();
} // RM
} // OPCODE_23_21 CR
// Thread ID and context ID registers
// Thread ID register needs cheaper access than miscreg
13: WarnUnimpl::mcr_mrc_cp15_c7();
// All the rest
default: decode OPCODE_20 {
0: PredOp::mcr_cp15({{
fault = setCp15Register(Rd, RN, OPCODE_23_21, RM, OPC2);
}});
1: PredOp::mrc_cp15({{
fault = readCp15Register(Rd, RN, OPCODE_23_21, RM, OPC2);
}});
}
} // RN
} // CPNUM (OP4 == 1)
} //OPCODE_4
1: Svc::svc();
} // OPCODE_24
}
}
}
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