464 lines
14 KiB
C++
464 lines
14 KiB
C++
// -*- mode:c++ -*-
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// Copyright (c) 2003-2005 The Regents of The University of Michigan
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met: redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer;
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// redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the distribution;
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// neither the name of the copyright holders nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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// Authors: Steve Reinhardt
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////////////////////////////////////////////////////////////////////
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//
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// Alpha ISA description file.
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//
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////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////
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//
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// Output include file directives.
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//
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output header {{
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#include <sstream>
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#include <iostream>
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#include <iomanip>
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#include "config/ss_compatible_fp.hh"
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#include "cpu/static_inst.hh"
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#include "arch/alpha/faults.hh"
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#include "mem/request.hh" // some constructors use MemReq flags
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}};
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output decoder {{
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#include "base/cprintf.hh"
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#include "base/fenv.hh"
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#include "base/loader/symtab.hh"
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#include "config/ss_compatible_fp.hh"
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#include "cpu/exec_context.hh" // for Jump::branchTarget()
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#include <math.h>
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using namespace AlphaISA;
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}};
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output exec {{
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#include <math.h>
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#if FULL_SYSTEM
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#include "sim/pseudo_inst.hh"
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#endif
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#include "base/fenv.hh"
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#include "config/ss_compatible_fp.hh"
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#include "cpu/base.hh"
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#include "cpu/exetrace.hh"
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#include "sim/sim_exit.hh"
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#include "mem/packet_impl.hh"
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using namespace AlphaISA;
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}};
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////////////////////////////////////////////////////////////////////
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//
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// Namespace statement. Everything below this line will be in the
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// AlphaISAInst namespace.
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//
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namespace AlphaISA;
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////////////////////////////////////////////////////////////////////
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//
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// Bitfield definitions.
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//
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// Universal (format-independent) fields
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def bitfield PALMODE <32:32>;
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def bitfield OPCODE <31:26>;
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def bitfield RA <25:21>;
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def bitfield RB <20:16>;
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// Memory format
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def signed bitfield MEMDISP <15: 0>; // displacement
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def bitfield MEMFUNC <15: 0>; // function code (same field, unsigned)
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// Memory-format jumps
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def bitfield JMPFUNC <15:14>; // function code (disp<15:14>)
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def bitfield JMPHINT <13: 0>; // tgt Icache idx hint (disp<13:0>)
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// Branch format
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def signed bitfield BRDISP <20: 0>; // displacement
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// Integer operate format(s>;
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def bitfield INTIMM <20:13>; // integer immediate (literal)
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def bitfield IMM <12:12>; // immediate flag
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def bitfield INTFUNC <11: 5>; // function code
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def bitfield RC < 4: 0>; // dest reg
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// Floating-point operate format
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def bitfield FA <25:21>;
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def bitfield FB <20:16>;
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def bitfield FP_FULLFUNC <15: 5>; // complete function code
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def bitfield FP_TRAPMODE <15:13>; // trapping mode
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def bitfield FP_ROUNDMODE <12:11>; // rounding mode
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def bitfield FP_TYPEFUNC <10: 5>; // type+func: handiest for decoding
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def bitfield FP_SRCTYPE <10: 9>; // source reg type
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def bitfield FP_SHORTFUNC < 8: 5>; // short function code
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def bitfield FP_SHORTFUNC_TOP2 <8:7>; // top 2 bits of short func code
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def bitfield FC < 4: 0>; // dest reg
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// PALcode format
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def bitfield PALFUNC <25: 0>; // function code
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// EV5 PAL instructions:
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// HW_LD/HW_ST
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def bitfield HW_LDST_PHYS <15>; // address is physical
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def bitfield HW_LDST_ALT <14>; // use ALT_MODE IPR
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def bitfield HW_LDST_WRTCK <13>; // HW_LD only: fault if no write acc
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def bitfield HW_LDST_QUAD <12>; // size: 0=32b, 1=64b
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def bitfield HW_LDST_VPTE <11>; // HW_LD only: is PTE fetch
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def bitfield HW_LDST_LOCK <10>; // HW_LD only: is load locked
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def bitfield HW_LDST_COND <10>; // HW_ST only: is store conditional
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def signed bitfield HW_LDST_DISP <9:0>; // signed displacement
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// HW_REI
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def bitfield HW_REI_TYP <15:14>; // type: stalling vs. non-stallingk
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def bitfield HW_REI_MBZ <13: 0>; // must be zero
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// HW_MTPR/MW_MFPR
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def bitfield HW_IPR_IDX <15:0>; // IPR index
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// M5 instructions
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def bitfield M5FUNC <7:0>;
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def operand_types {{
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'sb' : ('signed int', 8),
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'ub' : ('unsigned int', 8),
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'sw' : ('signed int', 16),
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'uw' : ('unsigned int', 16),
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'sl' : ('signed int', 32),
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'ul' : ('unsigned int', 32),
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'sq' : ('signed int', 64),
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'uq' : ('unsigned int', 64),
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'sf' : ('float', 32),
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'df' : ('float', 64)
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}};
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def operands {{
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# Int regs default to unsigned, but code should not count on this.
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# For clarity, descriptions that depend on unsigned behavior should
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# explicitly specify '.uq'.
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'Ra': ('IntReg', 'uq', 'PALMODE ? AlphaISA::reg_redir[RA] : RA',
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'IsInteger', 1),
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'Rb': ('IntReg', 'uq', 'PALMODE ? AlphaISA::reg_redir[RB] : RB',
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'IsInteger', 2),
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'Rc': ('IntReg', 'uq', 'PALMODE ? AlphaISA::reg_redir[RC] : RC',
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'IsInteger', 3),
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'Fa': ('FloatReg', 'df', 'FA', 'IsFloating', 1),
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'Fb': ('FloatReg', 'df', 'FB', 'IsFloating', 2),
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'Fc': ('FloatReg', 'df', 'FC', 'IsFloating', 3),
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'Mem': ('Mem', 'uq', None, ('IsMemRef', 'IsLoad', 'IsStore'), 4),
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'NPC': ('NPC', 'uq', None, ( None, None, 'IsControl' ), 4),
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'Runiq': ('ControlReg', 'uq', 'TheISA::Uniq_DepTag', None, 1),
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'FPCR': (' ControlReg', 'uq', 'TheISA::Fpcr_DepTag', None, 1),
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# The next two are hacks for non-full-system call-pal emulation
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'R0': ('IntReg', 'uq', '0', None, 1),
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'R16': ('IntReg', 'uq', '16', None, 1),
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'R17': ('IntReg', 'uq', '17', None, 1),
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'R18': ('IntReg', 'uq', '18', None, 1)
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}};
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////////////////////////////////////////////////////////////////////
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//
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// Basic instruction classes/templates/formats etc.
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//
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output header {{
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// uncomment the following to get SimpleScalar-compatible disassembly
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// (useful for diffing output traces).
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// #define SS_COMPATIBLE_DISASSEMBLY
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/**
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* Base class for all Alpha static instructions.
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*/
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class AlphaStaticInst : public StaticInst
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{
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protected:
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/// Make AlphaISA register dependence tags directly visible in
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/// this class and derived classes. Maybe these should really
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/// live here and not in the AlphaISA namespace.
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enum DependenceTags {
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FP_Base_DepTag = AlphaISA::FP_Base_DepTag,
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Fpcr_DepTag = AlphaISA::Fpcr_DepTag,
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Uniq_DepTag = AlphaISA::Uniq_DepTag,
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Lock_Flag_DepTag = AlphaISA::Lock_Flag_DepTag,
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Lock_Addr_DepTag = AlphaISA::Lock_Addr_DepTag,
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IPR_Base_DepTag = AlphaISA::IPR_Base_DepTag
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};
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/// Constructor.
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AlphaStaticInst(const char *mnem, ExtMachInst _machInst,
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OpClass __opClass)
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: StaticInst(mnem, _machInst, __opClass)
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{
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}
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/// Print a register name for disassembly given the unique
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/// dependence tag number (FP or int).
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void printReg(std::ostream &os, int reg) const;
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std::string
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generateDisassembly(Addr pc, const SymbolTable *symtab) const;
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};
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}};
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output decoder {{
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void
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AlphaStaticInst::printReg(std::ostream &os, int reg) const
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{
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if (reg < FP_Base_DepTag) {
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ccprintf(os, "r%d", reg);
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}
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else {
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ccprintf(os, "f%d", reg - FP_Base_DepTag);
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}
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}
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std::string
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AlphaStaticInst::generateDisassembly(Addr pc,
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const SymbolTable *symtab) const
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{
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std::stringstream ss;
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ccprintf(ss, "%-10s ", mnemonic);
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// just print the first two source regs... if there's
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// a third one, it's a read-modify-write dest (Rc),
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// e.g. for CMOVxx
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if (_numSrcRegs > 0) {
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printReg(ss, _srcRegIdx[0]);
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}
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if (_numSrcRegs > 1) {
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ss << ",";
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printReg(ss, _srcRegIdx[1]);
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}
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// just print the first dest... if there's a second one,
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// it's generally implicit
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if (_numDestRegs > 0) {
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if (_numSrcRegs > 0)
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ss << ",";
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printReg(ss, _destRegIdx[0]);
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}
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return ss.str();
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}
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}};
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// Declarations for execute() methods.
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def template BasicExecDeclare {{
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Fault execute(%(CPU_exec_context)s *, Trace::InstRecord *) const;
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}};
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// Basic instruction class declaration template.
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def template BasicDeclare {{
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/**
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* Static instruction class for "%(mnemonic)s".
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*/
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class %(class_name)s : public %(base_class)s
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{
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public:
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/// Constructor.
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%(class_name)s(ExtMachInst machInst);
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%(BasicExecDeclare)s
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};
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}};
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// Basic instruction class constructor template.
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def template BasicConstructor {{
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inline %(class_name)s::%(class_name)s(ExtMachInst machInst)
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: %(base_class)s("%(mnemonic)s", machInst, %(op_class)s)
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{
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%(constructor)s;
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}
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}};
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// Basic instruction class execute method template.
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def template BasicExecute {{
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Fault %(class_name)s::execute(%(CPU_exec_context)s *xc,
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Trace::InstRecord *traceData) const
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{
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Fault fault = NoFault;
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%(fp_enable_check)s;
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%(op_decl)s;
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%(op_rd)s;
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%(code)s;
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if (fault == NoFault) {
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%(op_wb)s;
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}
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return fault;
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}
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}};
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// Basic decode template.
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def template BasicDecode {{
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return new %(class_name)s(machInst);
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}};
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// Basic decode template, passing mnemonic in as string arg to constructor.
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def template BasicDecodeWithMnemonic {{
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return new %(class_name)s("%(mnemonic)s", machInst);
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}};
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// The most basic instruction format... used only for a few misc. insts
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def format BasicOperate(code, *flags) {{
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iop = InstObjParams(name, Name, 'AlphaStaticInst', CodeBlock(code), flags)
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header_output = BasicDeclare.subst(iop)
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decoder_output = BasicConstructor.subst(iop)
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decode_block = BasicDecode.subst(iop)
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exec_output = BasicExecute.subst(iop)
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}};
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////////////////////////////////////////////////////////////////////
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//
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// Nop
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//
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output header {{
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/**
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* Static instruction class for no-ops. This is a leaf class.
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*/
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class Nop : public AlphaStaticInst
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{
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/// Disassembly of original instruction.
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const std::string originalDisassembly;
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public:
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/// Constructor
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Nop(const std::string _originalDisassembly, ExtMachInst _machInst)
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: AlphaStaticInst("nop", _machInst, No_OpClass),
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originalDisassembly(_originalDisassembly)
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{
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flags[IsNop] = true;
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}
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~Nop() { }
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std::string
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generateDisassembly(Addr pc, const SymbolTable *symtab) const;
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%(BasicExecDeclare)s
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};
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/// Helper function for decoding nops. Substitute Nop object
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/// for original inst passed in as arg (and delete latter).
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static inline
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AlphaStaticInst *
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makeNop(AlphaStaticInst *inst)
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{
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AlphaStaticInst *nop = new Nop(inst->disassemble(0), inst->machInst);
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delete inst;
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return nop;
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}
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}};
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output decoder {{
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std::string Nop::generateDisassembly(Addr pc,
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const SymbolTable *symtab) const
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{
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#ifdef SS_COMPATIBLE_DISASSEMBLY
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return originalDisassembly;
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#else
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return csprintf("%-10s (%s)", "nop", originalDisassembly);
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#endif
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}
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}};
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output exec {{
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Fault
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Nop::execute(%(CPU_exec_context)s *, Trace::InstRecord *) const
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{
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return NoFault;
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}
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}};
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// integer & FP operate instructions use Rc as dest, so check for
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// Rc == 31 to detect nops
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def template OperateNopCheckDecode {{
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{
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AlphaStaticInst *i = new %(class_name)s(machInst);
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if (RC == 31) {
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i = makeNop(i);
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}
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return i;
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}
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}};
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// Like BasicOperate format, but generates NOP if RC/FC == 31
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def format BasicOperateWithNopCheck(code, *opt_args) {{
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iop = InstObjParams(name, Name, 'AlphaStaticInst', CodeBlock(code),
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opt_args)
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header_output = BasicDeclare.subst(iop)
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decoder_output = BasicConstructor.subst(iop)
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decode_block = OperateNopCheckDecode.subst(iop)
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exec_output = BasicExecute.subst(iop)
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}};
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// Integer instruction templates, formats, etc.
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##include "int.isa"
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// Floating-point instruction templates, formats, etc.
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##include "fp.isa"
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// Memory instruction templates, formats, etc.
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##include "mem.isa"
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// Branch/jump instruction templates, formats, etc.
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##include "branch.isa"
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// PAL instruction templates, formats, etc.
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##include "pal.isa"
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// Opcdec fault instruction templates, formats, etc.
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##include "opcdec.isa"
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// Unimplemented instruction templates, formats, etc.
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##include "unimp.isa"
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// Unknown instruction templates, formats, etc.
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##include "unknown.isa"
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// Execution utility functions
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##include "util.isa"
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// The actual decoder
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##include "decoder.isa"
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