misc: Rename misc.(hh|cc) to logging.(hh|cc)

These files aren't a collection of miscellaneous stuff, they're the
definition of the Logger interface, and a few utility macros for
calling into that interface (panic, warn, etc.).

Change-Id: I84267ac3f45896a83c0ef027f8f19c5e9a5667d1
Reviewed-on: https://gem5-review.googlesource.com/6226
Reviewed-by: Brandon Potter <Brandon.Potter@amd.com>
Maintainer: Gabe Black <gabeblack@google.com>

arch: Use shared_ptr for all Faults

This patch takes quite a large step in transitioning from the ad-hoc
RefCountingPtr to the c++11 shared_ptr by adopting its use for all
Faults. There are no changes in behaviour, and the code modifications
are mostly just replacing "new" with "make_shared".

arch: Use const StaticInstPtr references where possible

This patch optimises the passing of StaticInstPtr by avoiding copying
the reference-counting pointer. This avoids first incrementing and
then decrementing the reference-counting pointer.

alpha,arm,mips,power,x86,cpu,sim: Cleanup activate/deactivate

activate(), suspend(), and halt() used on thread contexts had an optional
delay parameter. However this parameter was often ignored. Also, when used,
the delay was seemily arbitrarily set to 0 or 1 cycle (no other delays were
ever specified). This patch removes the delay parameter and 'Events'
associated with them across all ISAs and cores. Unused activate logic
is also removed.

Clock: Add a Cycles wrapper class and use where applicable

This patch addresses the comments and feedback on the preceding patch
that reworks the clocks and now more clearly shows where cycles
(relative cycle counts) are used to express time.

Instead of bumping the existing patch I chose to make this a separate
patch, merely to try and focus the discussion around a smaller set of
changes. The two patches will be pushed together though.

This changes done as part of this patch are mostly following directly
from the introduction of the wrapper class, and change enough code to
make things compile and run again. There are definitely more places
where int/uint/Tick is still used to represent cycles, and it will
take some time to chase them all down. Similarly, a lot of parameters
should be changed from Param.Tick and Param.Unsigned to
Param.Cycles.

In addition, the use of curTick is questionable as there should not be
an absolute cycle. Potential solutions can be built on top of this
patch. There is a similar situation in the o3 CPU where
lastRunningCycle is currently counting in Cycles, and is still an
absolute time. More discussion to be had in other words.

An additional change that would be appropriate in the future is to
perform a similar wrapping of Tick and probably also introduce a
Ticks class along with suitable operators for all these classes.

SPARC: Make PSTATE and HPSTATE a BitUnion.

This gets rid of cryptic bits of code with lots of bit manipulation, and makes
some comments redundant.

SE/FS: Make getProcessPtr available in both modes, and get rid of FULL_SYSTEMs.

Trace: Allow printing ASIDs and selectively tracing based on user/kernel code.

Debug flags are ExecUser, ExecKernel, and ExecAsid. ExecUser and
ExecKernel are set by default when Exec is specified. Use minus
sign with ExecUser or ExecKernel to remove user or kernel tracing
respectively.

includes: sort all includes

Fault: Rename sim/fault.hh to fault_fwd.hh to distinguish it from faults.hh.

SPARC: Clean up some historical style issues.

ISA,CPU,etc: Create an ISA defined PC type that abstracts out ISA behaviors.



This change is a low level and pervasive reorganization of how PCs are managed
in M5. Back when Alpha was the only ISA, there were only 2 PCs to worry about,
the PC and the NPC, and the lsb of the PC signaled whether or not you were in
PAL mode. As other ISAs were added, we had to add an NNPC, micro PC and next
micropc, x86 and ARM introduced variable length instruction sets, and ARM
started to keep track of mode bits in the PC. Each CPU model handled PCs in
its own custom way that needed to be updated individually to handle the new
dimensions of variability, or, in the case of ARMs mode-bit-in-the-pc hack,
the complexity could be hidden in the ISA at the ISA implementation's expense.
Areas like the branch predictor hadn't been updated to handle branch delay
slots or micropcs, and it turns out that had introduced a significant (10s of
percent) performance bug in SPARC and to a lesser extend MIPS. Rather than
perpetuate the problem by reworking O3 again to handle the PC features needed
by x86, this change was introduced to rework PC handling in a more modular,
transparent, and hopefully efficient way.


PC type:

Rather than having the superset of all possible elements of PC state declared
in each of the CPU models, each ISA defines its own PCState type which has
exactly the elements it needs. A cross product of canned PCState classes are
defined in the new "generic" ISA directory for ISAs with/without delay slots
and microcode. These are either typedef-ed or subclassed by each ISA. To read
or write this structure through a *Context, you use the new pcState() accessor
which reads or writes depending on whether it has an argument. If you just
want the address of the current or next instruction or the current micro PC,
you can get those through read-only accessors on either the PCState type or
the *Contexts. These are instAddr(), nextInstAddr(), and microPC(). Note the
move away from readPC. That name is ambiguous since it's not clear whether or
not it should be the actual address to fetch from, or if it should have extra
bits in it like the PAL mode bit. Each class is free to define its own
functions to get at whatever values it needs however it needs to to be used in
ISA specific code. Eventually Alpha's PAL mode bit could be moved out of the
PC and into a separate field like ARM.

These types can be reset to a particular pc (where npc = pc +
sizeof(MachInst), nnpc = npc + sizeof(MachInst), upc = 0, nupc = 1 as
appropriate), printed, serialized, and compared. There is a branching()
function which encapsulates code in the CPU models that checked if an
instruction branched or not. Exactly what that means in the context of branch
delay slots which can skip an instruction when not taken is ambiguous, and
ideally this function and its uses can be eliminated. PCStates also generally
know how to advance themselves in various ways depending on if they point at
an instruction, a microop, or the last microop of a macroop. More on that
later.

Ideally, accessing all the PCs at once when setting them will improve
performance of M5 even though more data needs to be moved around. This is
because often all the PCs need to be manipulated together, and by getting them
all at once you avoid multiple function calls. Also, the PCs of a particular
thread will have spatial locality in the cache. Previously they were grouped
by element in arrays which spread out accesses.


Advancing the PC:

The PCs were previously managed entirely by the CPU which had to know about PC
semantics, try to figure out which dimension to increment the PC in, what to
set NPC/NNPC, etc. These decisions are best left to the ISA in conjunction
with the PC type itself. Because most of the information about how to
increment the PC (mainly what type of instruction it refers to) is contained
in the instruction object, a new advancePC virtual function was added to the
StaticInst class. Subclasses provide an implementation that moves around the
right element of the PC with a minimal amount of decision making. In ISAs like
Alpha, the instructions always simply assign NPC to PC without having to worry
about micropcs, nnpcs, etc. The added cost of a virtual function call should
be outweighed by not having to figure out as much about what to do with the
PCs and mucking around with the extra elements.

One drawback of making the StaticInsts advance the PC is that you have to
actually have one to advance the PC. This would, superficially, seem to
require decoding an instruction before fetch could advance. This is, as far as
I can tell, realistic. fetch would advance through memory addresses, not PCs,
perhaps predicting new memory addresses using existing ones. More
sophisticated decisions about control flow would be made later on, after the
instruction was decoded, and handed back to fetch. If branching needs to
happen, some amount of decoding needs to happen to see that it's a branch,
what the target is, etc. This could get a little more complicated if that gets
done by the predecoder, but I'm choosing to ignore that for now.


Variable length instructions:

To handle variable length instructions in x86 and ARM, the predecoder now
takes in the current PC by reference to the getExtMachInst function. It can
modify the PC however it needs to (by setting NPC to be the PC + instruction
length, for instance). This could be improved since the CPU doesn't know if
the PC was modified and always has to write it back.


ISA parser:

To support the new API, all PC related operand types were removed from the
parser and replaced with a PCState type. There are two warts on this
implementation. First, as with all the other operand types, the PCState still
has to have a valid operand type even though it doesn't use it. Second, using
syntax like PCS.npc(target) doesn't work for two reasons, this looks like the
syntax for operand type overriding, and the parser can't figure out if you're
reading or writing. Instructions that use the PCS operand (which I've
consistently called it) need to first read it into a local variable,
manipulate it, and then write it back out.


Return address stack:

The return address stack needed a little extra help because, in the presence
of branch delay slots, it has to merge together elements of the return PC and
the call PC. To handle that, a buildRetPC utility function was added. There
are basically only two versions in all the ISAs, but it didn't seem short
enough to put into the generic ISA directory. Also, the branch predictor code
in O3 and InOrder were adjusted so that they always store the PC of the actual
call instruction in the RAS, not the next PC. If the call instruction is a
microop, the next PC refers to the next microop in the same macroop which is
probably not desirable. The buildRetPC function advances the PC intelligently
to the next macroop (in an ISA specific way) so that that case works.


Change in stats:

There were no change in stats except in MIPS and SPARC in the O3 model. MIPS
runs in about 9% fewer ticks. SPARC runs with 30%-50% fewer ticks, which could
likely be improved further by setting call/return instruction flags and taking
advantage of the RAS.


TODO:

Add != operators to the PCState classes, defined trivially to be !(a==b).
Smooth out places where PCs are split apart, passed around, and put back
together later. I think this might happen in SPARC's fault code. Add ISA
specific constructors that allow setting PC elements without calling a bunch
of accessors. Try to eliminate the need for the branching() function. Factor
out Alpha's PAL mode pc bit into a separate flag field, and eliminate places
where it's blindly masked out or tested in the PC.

GetArgument: Rework getArgument so that X86_FS compiles again.

When no size is specified for an argument, push the decision about what size
to use into the ISA by passing a size of -1.

Debug: Implement getArgument() and function skipping for ARM.

In the process make add skipFuction() to handle isa specific function skipping
instead of ifdefs and other ugliness. For almost all ABIs, 64 bit arguments can
only start in even registers. Size is now passed to getArgument() so that 32
bit systems can make decisions about register selection for 64 bit arguments.
The number argument is now passed by reference because getArgument() will need
to change it based on the size of the argument and the current argument number.

For ARM, if the argument number is odd and a 64-bit register is requested the
number must first be incremented to because all 64 bit arguments are passed
in an even argument register. Then the number will be incremented again to
access both halves of the argument.

Faults: Pass the StaticInst involved, if any, to a Fault's invoke method.

Also move the "Fault" reference counted pointer type into a separate file,
sim/fault.hh. It would be better to name this less similarly to sim/faults.hh
to reduce confusion, but fault.hh matches the name of the type. We could change
Fault to FaultPtr to match other pointer types, and then changing the name of
the file would make more sense.

ISA: Get rid of old, unused utility functions cluttering up the ISAs.

SPARC: Fix some style issues in utility.hh.

SPARC: Fold the MiscRegFile all the way into the ISA object.

Registers: Add a registers.hh file as an ISA switched header.
This file is for register indices, Num* constants, and register types.
copyRegs and copyMiscRegs were moved to utility.hh and utility.cc.

SPARC: Phase out SPARC's intregfile.hh.

SPARC: Fix the parenthesis in inUserMode.

Arguments: Get rid of duplicate code for the Arguments class in each architecture.
Move the argument files to src/sim and add a utility.cc file with a function
getArguments() that returns the given argument in the architecture specific fashion.
getArguments() was getArg() is the architecture specific Argument class and has had
all magic numbers replaced with meaningful constants. Also add a function to the
Argument class for testing if an argument is NULL.

Merge zizzer.eecs.umich.edu:/bk/newmem
into ahchoo.blinky.homelinux.org:/home/gblack/m5/newmem-x86

src/arch/mips/utility.hh:
src/arch/x86/SConscript:
Hand merge

implement ipi stufff for SPARC

src/arch/alpha/utility.hh:
src/arch/mips/utility.hh:
src/arch/sparc/utility.hh:
src/arch/x86/utility.hh:
add hook for system to startup the cpu or not... in the case of FS sparc, only the first cpu would get spunup.. the rest sit in an idle state until they get an ipi
src/arch/sparc/isa/decoder.isa:
handle writable bits of strandstatus register in miscregfile
src/arch/sparc/miscregfile.hh:
some constants for the strand status register
src/arch/sparc/ua2005.cc:
properly implement the strand status register
src/dev/sparc/iob.cc:
implement ipi generation properly
src/sim/system.cc:
call into the ISA to start the CPU (or not)

Make the predecoder an object with it's own switched header file. Start adding predecoding functionality to x86.

src/arch/SConscript:
src/arch/alpha/utility.hh:
src/arch/mips/utility.hh:
src/arch/sparc/utility.hh:
src/cpu/base.hh:
src/cpu/o3/fetch.hh:
src/cpu/o3/fetch_impl.hh:
src/cpu/simple/atomic.cc:
src/cpu/simple/base.cc:
src/cpu/simple/base.hh:
src/cpu/static_inst.hh:
src/arch/alpha/predecoder.hh:
src/arch/mips/predecoder.hh:
src/arch/sparc/predecoder.hh:
Make the predecoder an object with it's own switched header file.

Replaced makeExtMI with predecode.
Removed the getOpcode function from StaticInst which only made sense for Alpha.
Started implementing the x86 predecoder.

*MiscReg->*MiscRegNoEffect, *MiscRegWithEffect->*MiscReg

make our code a little more standards compliant
pretty close to compiling w/ suns compiler

briefly:
add dummy return after panic()/fatal()
split out flags by compiler vendor
include cstring and cmath where appropriate
use std namespace for string ops

SConstruct:
Add code to detect compiler and choose cflags based on detected compiler
Fix zlib check to work with suncc
src/SConscript:
split out flags by compiler vendor
src/arch/sparc/isa/decoder.isa:
use correct namespace for sqrt
src/arch/sparc/isa/formats/basic.isa:
add dummy return around panic
src/arch/sparc/isa/formats/integerop.isa:
use correct namespace for stringops
src/arch/sparc/isa/includes.isa:
include cstring and cmath where appropriate
src/arch/sparc/isa_traits.hh:
remove dangling comma
src/arch/sparc/system.cc:
dummy return to make sun cc front end happy
src/arch/sparc/tlb.cc:
src/base/compression/lzss_compression.cc:
use std namespace for string ops
src/arch/sparc/utility.hh:
no reason to say something is unsigned unsigned int
src/base/compression/null_compression.hh:
dummy returns to for suncc front end
src/base/cprintf.hh:
use standard variadic argument syntax instead of gnuc specefic renaming
src/base/hashmap.hh:
don't need to define hash for suncc
src/base/hostinfo.cc:
need stdio.h for sprintf
src/base/loader/object_file.cc:
munmap is in std namespace not null
src/base/misc.hh:
use M5 generic noreturn macros
use standard variadic macro __VA_ARGS__
src/base/pollevent.cc:
we need file.h for file flags
src/base/random.cc:
mess with include files to make suncc happy
src/base/remote_gdb.cc:
malloc memory for function instead of having a non-constant in an array size
src/base/statistics.hh:
use std namespace for floor
src/base/stats/text.cc:
include math.h for rint (cmath won't work)
src/base/time.cc:
use suncc version of ctime_r
src/base/time.hh:
change macro to work with both gcc and suncc
src/base/timebuf.hh:
include cstring from memset and use std::
src/base/trace.hh:
change variadic macros to be normal format
src/cpu/SConscript:
add dummy returns where appropriate
src/cpu/activity.cc:
include cstring for memset
src/cpu/exetrace.hh:
include cstring fro memcpy
src/cpu/simple/base.hh:
add dummy return for panic
src/dev/baddev.cc:
src/dev/pciconfigall.cc:
src/dev/platform.cc:
src/dev/sparc/t1000.cc:
add dummy return where appropriate
src/dev/ide_atareg.h:
make define work for both gnuc and suncc
src/dev/io_device.hh:
add dummy returns where approirate
src/dev/pcidev.hh:
src/mem/cache/cache_impl.hh:
src/mem/cache/miss/blocking_buffer.cc:
src/mem/cache/tags/lru.hh:
src/mem/cache/tags/split.hh:
src/mem/cache/tags/split_lifo.hh:
src/mem/cache/tags/split_lru.hh:
src/mem/dram.cc:
src/mem/packet.cc:
src/mem/port.cc:
include cstring for string ops
src/dev/sparc/mm_disk.cc:
add dummy return where appropriate
include cstring for string ops
src/mem/cache/miss/blocking_buffer.hh:
src/mem/port.hh:
Add dummy return where appropriate
src/mem/cache/tags/iic.cc:
cast hastSets to double for log() call
src/mem/physical.cc:
cast pmemAddr to char* for munmap
src/sim/byteswap.hh:
make define work for suncc and gnuc

fix endian issues with condition codes
use memcpy instead of bcopy
s/u_int32_t/uint32_t/g
fixup endian code to work with solaris
hack to make sure htole() works... Nate, have a good idea to fix this?

src/arch/sparc/faults.cc:
set the reset address to be 40 bits. Makes PC printing easier at least for now.
src/arch/sparc/isa/base.isa:
fix endian issues with condition codes
src/arch/sparc/tlb.hh:
add implemented physical addres constants
src/arch/sparc/utility.hh:
add tlb.hh to utilities
src/base/loader/raw_object.cc:
add a symbol <filename>_start to the symbol table for binaries files
src/base/remote_gdb.cc:
use memcpy instead of bcopy
src/cpu/exetrace.cc:
clean up printing a bit more
src/cpu/m5legion_interface.h:
add tons to the shared interface
src/dev/ethertap.cc:
s/u_int32_t/uint32_t/g
src/dev/ide_atareg.h:
fixup endian code to work with solaris
src/dev/pcidev.cc:
src/sim/param.hh:
hack to make sure htole() works...

Move the check to see if you're in user mode into the isa directory.

Use a PowerOnReset to initialize the cpu.

Added a stub initCPU function. This would be a good place to force in a PowerOnReset fault to kick start the CPU.

Made sure the constructor for insts use ExtMachInst rather than MachInst, since otherwise the EXT_ASI field is lost.

src/arch/sparc/isa/base.isa:
src/arch/sparc/isa/formats/micro.isa:
Switch MachInst to ExtMachInst so that the EXT_ASI field is available to the instructions.
src/arch/sparc/utility.hh:
Made sure EXT_ASI was set to the appropriate ASI value whether or not the asi register was used.

Some support for handling block loads and stores and ASIs properly.

src/arch/sparc/isa/bitfields.isa:
Added a field to retrieve the asi from the ExtMachInst
src/arch/sparc/isa/decoder.isa:
Fixed up how the size of memory operations where handled, and use the new EXT_ASI bit field.
src/arch/sparc/isa/formats.isa:
add includes for the new formats.
src/arch/sparc/isa/formats/basic.isa:
Add a template for BasicDecodeWithMnemonic which is needed by the unimp format.
src/arch/sparc/isa/formats/mem.isa:
Change around the memory format to figure out the memory access width on its own.
src/arch/sparc/isa/operands.isa:
Added support for the operands of block loads/stores which are offset from Frd.
src/arch/sparc/utility.hh:
Encoded the ASI into the ExtMachInst

Change ExecContext to ThreadContext. This is being renamed to differentiate between the interface used objects outside of the CPU, and the interface used by the ISA. ThreadContext is used by objects outside of the CPU and is specifically defined in thread_context.hh. ExecContext is more implicit, and is defined by files such as base_dyn_inst.hh or cpu/simple/base.hh.

Further renames/reorganization will be coming shortly; what is currently CPUExecContext (the old ExecContext from m5) will be renamed to SimpleThread or something similar.

src/arch/alpha/arguments.cc:
src/arch/alpha/arguments.hh:
src/arch/alpha/ev5.cc:
src/arch/alpha/faults.cc:
src/arch/alpha/faults.hh:
src/arch/alpha/freebsd/system.cc:
src/arch/alpha/freebsd/system.hh:
src/arch/alpha/isa/branch.isa:
src/arch/alpha/isa/decoder.isa:
src/arch/alpha/isa/main.isa:
src/arch/alpha/linux/process.cc:
src/arch/alpha/linux/system.cc:
src/arch/alpha/linux/system.hh:
src/arch/alpha/linux/threadinfo.hh:
src/arch/alpha/process.cc:
src/arch/alpha/regfile.hh:
src/arch/alpha/stacktrace.cc:
src/arch/alpha/stacktrace.hh:
src/arch/alpha/tlb.cc:
src/arch/alpha/tlb.hh:
src/arch/alpha/tru64/process.cc:
src/arch/alpha/tru64/system.cc:
src/arch/alpha/tru64/system.hh:
src/arch/alpha/utility.hh:
src/arch/alpha/vtophys.cc:
src/arch/alpha/vtophys.hh:
src/arch/mips/faults.cc:
src/arch/mips/faults.hh:
src/arch/mips/isa_traits.cc:
src/arch/mips/isa_traits.hh:
src/arch/mips/linux/process.cc:
src/arch/mips/process.cc:
src/arch/mips/regfile/float_regfile.hh:
src/arch/mips/regfile/int_regfile.hh:
src/arch/mips/regfile/misc_regfile.hh:
src/arch/mips/regfile/regfile.hh:
src/arch/mips/stacktrace.hh:
src/arch/sparc/faults.cc:
src/arch/sparc/faults.hh:
src/arch/sparc/isa_traits.hh:
src/arch/sparc/linux/process.cc:
src/arch/sparc/linux/process.hh:
src/arch/sparc/process.cc:
src/arch/sparc/regfile.hh:
src/arch/sparc/solaris/process.cc:
src/arch/sparc/stacktrace.hh:
src/arch/sparc/ua2005.cc:
src/arch/sparc/utility.hh:
src/arch/sparc/vtophys.cc:
src/arch/sparc/vtophys.hh:
src/base/remote_gdb.cc:
src/base/remote_gdb.hh:
src/cpu/base.cc:
src/cpu/base.hh:
src/cpu/base_dyn_inst.hh:
src/cpu/checker/cpu.cc:
src/cpu/checker/cpu.hh:
src/cpu/checker/exec_context.hh:
src/cpu/cpu_exec_context.cc:
src/cpu/cpu_exec_context.hh:
src/cpu/cpuevent.cc:
src/cpu/cpuevent.hh:
src/cpu/exetrace.hh:
src/cpu/intr_control.cc:
src/cpu/memtest/memtest.hh:
src/cpu/o3/alpha_cpu.hh:
src/cpu/o3/alpha_cpu_impl.hh:
src/cpu/o3/alpha_dyn_inst_impl.hh:
src/cpu/o3/commit.hh:
src/cpu/o3/commit_impl.hh:
src/cpu/o3/cpu.cc:
src/cpu/o3/cpu.hh:
src/cpu/o3/fetch_impl.hh:
src/cpu/o3/regfile.hh:
src/cpu/o3/thread_state.hh:
src/cpu/ozone/back_end.hh:
src/cpu/ozone/cpu.hh:
src/cpu/ozone/cpu_impl.hh:
src/cpu/ozone/front_end.hh:
src/cpu/ozone/front_end_impl.hh:
src/cpu/ozone/inorder_back_end.hh:
src/cpu/ozone/lw_back_end.hh:
src/cpu/ozone/lw_back_end_impl.hh:
src/cpu/ozone/lw_lsq.hh:
src/cpu/ozone/lw_lsq_impl.hh:
src/cpu/ozone/thread_state.hh:
src/cpu/pc_event.cc:
src/cpu/pc_event.hh:
src/cpu/profile.cc:
src/cpu/profile.hh:
src/cpu/quiesce_event.cc:
src/cpu/quiesce_event.hh:
src/cpu/simple/atomic.cc:
src/cpu/simple/base.cc:
src/cpu/simple/base.hh:
src/cpu/simple/timing.cc:
src/cpu/static_inst.cc:
src/cpu/static_inst.hh:
src/cpu/thread_state.hh:
src/dev/alpha_console.cc:
src/dev/ns_gige.cc:
src/dev/sinic.cc:
src/dev/tsunami_cchip.cc:
src/kern/kernel_stats.cc:
src/kern/kernel_stats.hh:
src/kern/linux/events.cc:
src/kern/linux/events.hh:
src/kern/system_events.cc:
src/kern/system_events.hh:
src/kern/tru64/dump_mbuf.cc:
src/kern/tru64/tru64.hh:
src/kern/tru64/tru64_events.cc:
src/kern/tru64/tru64_events.hh:
src/mem/vport.cc:
src/mem/vport.hh:
src/sim/faults.cc:
src/sim/faults.hh:
src/sim/process.cc:
src/sim/process.hh:
src/sim/pseudo_inst.cc:
src/sim/pseudo_inst.hh:
src/sim/syscall_emul.cc:
src/sim/syscall_emul.hh:
src/sim/system.cc:
src/cpu/thread_context.hh:
src/sim/system.hh:
src/sim/vptr.hh:
Change ExecContext to ThreadContext.

Updated Authors from bk prs info

New directory structure:
- simulator source now in 'src' subdirectory
- imported files from 'ext' repository
- support building in arbitrary places, including
outside of the source tree. See comment at top
of SConstruct file for more details.
Regression tests are temporarily disabled; that
syetem needs more extensive revisions.

SConstruct:
Update for new directory structure.
Modify to support build trees that are not subdirectories
of the source tree. See comment at top of file for
more details.
Regression tests are temporarily disabled.
src/arch/SConscript:
src/arch/isa_parser.py:
src/python/SConscript:
Update for new directory structure.