1. Microops are created. These are StaticInsts use templates to provide a basic form of polymorphism without having to make the microassembler smarter.
2. An instruction class is created which has a "templated" microcode program as it's docstring. The template parameters are refernced with ^ following by a number.
3. An instruction in the decoder references an instruction template using it's mnemonic. The parameters to it's format end up replacing the placeholders. These parameters describe a source for an operand which could be memory, a register, or an immediate. It it's a register, the register index is used. If it's memory, eventually a load/store will be pre/postpended to the instruction template and it's destination register will be used in place of the ^. If it's an immediate, the immediate is used. Some operand types, specifically those that come from the ModRM byte, need to be decoded further into memory vs. register versions. This is accomplished by making the decode_block text for these instructions another case statement based off ModRM.
4. Once all of the template parameters have been handled, the instruction goes throw the microcode assembler which resolves labels and creates a list of python op objects. If an operand is a register, it uses a % prefix, an immediate uses $, and a label uses @. If the operand is just letters, numbers, and underscores, it can appear immediately after the prefix. If it's not, it can be encolsed in non nested {}s.
5. If there is a single "op" object (which corresponds to a single microop) the decoder is set up to return it directly. If not, a macroop wrapper is created around it.
In the future, I'm considering seperating the operand type specialization from the template substitution step. A problem this introduces is that either the template arguments need to be kept around for the specialization step, or they need to be re-extracted. Re-extraction might be the way to go so that the operand formats can be coded directly into the micro assembler template without having to pass them in as parameters. I don't know if that's actually useful, though.
src/arch/x86/isa/decoder/one_byte_opcodes.isa:
src/arch/x86/isa/microasm.isa:
src/arch/x86/isa/microops/microops.isa:
src/arch/x86/isa/operands.isa:
src/arch/x86/isa/microops/base.isa:
Implemented polymorphic microops and changed around the microcode assembler syntax.
--HG--
extra : convert_revision : e341f7b8ea9350a31e586a3d33250137e5954f43
MicroOp: A single operation actually implemented in hardware.
MacroOp: A collection of microops which are executed as a unit.
Instruction: An architected instruction which can be implemented with a macroop or a microop.
--HG--
extra : convert_revision : 1cfc8409cc686c75220767839f55a30551aa6f13
into zamp.eecs.umich.edu:/z/ktlim2/clean/tmp/clean2
src/cpu/base_dyn_inst.hh:
Hand merge. Line is no longer needed because it's handled in the ISA.
--HG--
extra : convert_revision : 0be4067aa38759a5631c6940f0167d48fde2b680
src/arch/alpha/predecoder.hh:
src/arch/sparc/predecoder.hh:
Put in a missing include
src/cpu/exetrace.cc:
Convert the legion lockstep stuff from makeExtMI to the predecoder object.
--HG--
extra : convert_revision : 91bad4466f8db1447fff8608fa46a5f236dc3a89
into ahchoo.blinky.homelinux.org:/home/gblack/m5/newmem-x86
src/arch/mips/utility.hh:
src/arch/x86/SConscript:
Hand merge
--HG--
extra : convert_revision : 0ba457aab52bf6ffc9191fd1fe1006ca7704b5b0
Removed the getOpcode function from StaticInst which only made sense for Alpha.
Started implementing the x86 predecoder.
--HG--
extra : convert_revision : a13ea257c8943ef25e9bc573024a99abacf4a70d
src/arch/sparc/ua2005.cc:
fix interrupting when quisced. Since sticks correspond to instructions when not quisced we need to
check if were suspended and interrupt at the guess time
src/base/traceflags.py:
add trace flag for Iob
src/cpu/simple/base.cc:
Use Quisce instead of IPI trace flag
src/dev/sparc/iob.cc:
add some Dprintfs
--HG--
extra : convert_revision : 72e18fcc750ad1e4b2bb67b19b354eaffc6af6d5
