e7825aab59
The shadow registers are folded into the normal integer registers to ease renaming indexing.
Include the removed Opcdec class of instructions for faulting when a pal mode only instruction is decoded in non-pal mode.
arch/alpha/ev5.cc:
Changes to automatically map the shadow registers if the instruction is in PAL mode.
arch/alpha/isa/branch.isa:
arch/alpha/isa/decoder.isa:
arch/alpha/isa/fp.isa:
arch/alpha/isa/int.isa:
arch/alpha/isa/mem.isa:
arch/alpha/isa/pal.isa:
arch/alpha/isa/unimp.isa:
Changes for automatically using the shadow registers. Now instructions must decode based on an ExtMachInst, which is a MachInst with any decode context information concatenated onto the higher order bits.
arch/alpha/isa/main.isa:
Changes for automatically using the shadow registers. Now instructions must decode based on an ExtMachInst, which is a MachInst with any decode context information concatenated onto the higher order bits.
The decoder (for Alpha) uses the 32nd bit in order to determine if the machine is in PAL mode. If it is, then it refers to the reg_redir table to determine the true index of the register it is using.
Also include the opcdec instruction definition.
arch/alpha/isa_traits.hh:
Define ExtMachInst type that is used by the static inst in order to decode the instruction, given the context of being in pal mode or not.
Redefine the number of Int registers, splitting it into NumIntArchRegs (32) and NumIntRegs (32 + 8 shadow registers).
Change the dependence tags to reflect the integer registers include the 8 shadow registers.
Define function to make an ExtMachInst. Currently it is somewhat specific to Alpha; in the future it must be decided to make this more generic and possibly slower, or leave it specific to each architecture and ifdef it within the CPU.
arch/isa_parser.py:
Have static insts decode on the ExtMachInst.
base/remote_gdb.cc:
Support the automatic remapping of shadow registers. Remote GDB must now look at the PC being read in order to tell if it should use the normal register indices or the shadow register indices.
cpu/o3/regfile.hh:
Comment out the pal registers; they are now a part of the integer registers.
cpu/simple/cpu.cc:
Create an ExtMachInst to decode on, based on the normal MachInst and the PC of the instructoin.
cpu/static_inst.hh:
Change from MachInst to ExtMachInst to support shadow register renaming.
--HG--
extra : convert_revision : 1d23eabf735e297068e1917445a6348e9f8c88d5
449 lines
14 KiB
C++
449 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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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/mem_req.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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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 "m5/arch/alpha/isa/int.isa"
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// Floating-point instruction templates, formats, etc.
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##include "m5/arch/alpha/isa/fp.isa"
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// Memory instruction templates, formats, etc.
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##include "m5/arch/alpha/isa/mem.isa"
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// Branch/jump instruction templates, formats, etc.
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##include "m5/arch/alpha/isa/branch.isa"
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// PAL instruction templates, formats, etc.
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##include "m5/arch/alpha/isa/pal.isa"
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// Opcdec fault instruction templates, formats, etc.
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##include "m5/arch/alpha/isa/opcdec.isa"
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// Unimplemented instruction templates, formats, etc.
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##include "m5/arch/alpha/isa/unimp.isa"
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// Unknown instruction templates, formats, etc.
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##include "m5/arch/alpha/isa/unknown.isa"
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// Execution utility functions
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##include "m5/arch/alpha/isa/util.isa"
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// The actual decoder
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##include "m5/arch/alpha/isa/decoder.isa"
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