misc: updated shabang for python script

The default python on MacOS doesn’t have an alias to python2.
The official python version supported in gem5 is Python2.7.

This patch updates the shabang according to the version required in gem5.

Change-Id: I9533c0f7858b5b3cab0ef101be1ee5cd718105b0
Reviewed-on: https://gem5-review.googlesource.com/c/15375
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>

misc: Update #!env calls for python to explicit version

In some newer Linux distributions, env python default to Python 3.0. This
patch explicitly uses "python2" instead of just "python" for all scripts
that use #!

Reported-by: Sanchayan Maity <maitysanchayan@gmail.com>
Signed-off-by: Jason Lowe-Power <jason@lowepower.com>

riscv: [Patch 8/5] Added some regression tests to RISC-V

This patch is the eighth patch in a series adding RISC-V to gem5, and
third of the bonus patches to the original series of five. It adds some
regression tests to RISC-V.

Regression tests included:
- se/00.hello
- se/02.insttest (split into several binaries which are not included due
to large size)

The tests added to 00.insttest will need to be build manually; to
facilitate this, a Makefile is included. The required toolchain and
compiler (riscv64-unknown-elf-gcc) can be built from the riscv-tools
GitHub repository at https://github.com/riscv/riscv-tools.

Note that because EBREAK only makes sense when gdb is running or while in
FS mode, it is not included in the linux-rv64i insttest. ERET is not
included because it does not make sense in SE mode and, in fact, causes
a panic by design.

Note also that not every system call is tested in linux-rv64i; of the ones
defined in linux/process.hh, some have been given numbers but not
definitions for the toolchain, or are merely stubs that always return 0. Of
the ones that do work properly, only a subset are tested due to similar
functionality.

Signed-off by: Alec Roelke

Signed-off by: Jason Lowe-Power <jason@lowepower.com>

tests, ruby: Move rubytests from ALPHA (linux) to NULL (none)

This patch avoids compiling ALPHA six times as part of running
'util/regress', and instead relis on NULL with different protocols to
run the rubytest. All we need is the memory system, so there is really
no need to compile the ISA over and over again.

The one downside is the removal of running 'hello' for the variuos
ALPHA and protocol combinations, but if this is a concern we should
rather beef up the synthetic tests for the variuos protocols.

gpu-compute: AMD's baseline GPU model

ruby: rename MESI_CMP_directory to MESI_Two_Level

This is because the next patch introduces a three level hierarchy.

arch: Resurrect the NOISA build target and rename it NULL

This patch makes it possible to once again build gem5 without any
ISA. The main purpose is to enable work around the interconnect and
memory system without having to build any CPU models or device models.

The regress script is updated to include the NULL ISA target. Currently
no regressions make use of it, but all the testers could (and perhaps
should) transition to it.

util/regress: set --no-lto on regressions

See comment for motivation.

util/regress: Add the missing comma in the list of builds

Regression: Add a test for x86 timing full system ruby simulation

m5=>gem5: Make the regression script build gem5.* instead of m5.*

Regressions: Fix the regress script when "all" is used.

When the "all" test is specified, the "tests" list should have two elements in
it, "quick" and "long", not a single element "quick,long". The later would be
appropriate as the default for one of the command line options which are split
at commas, but at that point "tests" should already be a list.

Regression: Update the regress script after SE/FS merge

This patch updates the regress script to reflect the merge of the
SE/FS builds and the new structure of the test directories. It adds a
"mode" flag to the script, that defaults to both se and fs.

util/regress: make default action a more thorough regression

Changed the --variants option to --test-variants and added a new
--compile-variants option for variants that are only compiled
(not tested). The former still defaults to 'opt' and the latter
defaults to 'debug,fast'.

Also changed the behavior when no tests are specified from just
compiling to running the 'quick' tests.

As a result, a plain 'util/regress' invocation will now compile
(but not test) the debug and fast builds, and compile and run the
quick regressions on the opt build. This should be the default
set of tests that are run before committing. Since the nightly
regressions use this same script, this will also be the new
nightly regression behavior.

Test-only regressions can still be done by setting --compile=''.
Compile-only regressions can be done by setting --test=''.

Change default regression build from 'fast' to 'opt'

Regressions: Make X86_FS run automatically.

SCons: Turn some scons variables into command line options.

ARM: Add full-system regressions

regress: add some new options
add -n/--no-exec which doesn't execute scons, but just prints the command line
add -j0 which tries to calculate how many cpus you have
add -D/--build-dir to specify a build directory other than ./build

m5: Regression Tester Update

This patch includes the necessary regression updates to test the new ruby
configuration system. The patch includes support for multiple ruby protocols
and adds the ruby random tester. The patch removes atomic mode test for
ruby since ruby does not support atomic mode acceses. These tests can be
added back in when ruby supports atomic mode for real.

regress: add POWER to regressions

Regressions: Build ARM_SE regressions by default.

Add -k flag to util/regress.

Regressions: Added X86_SE into the default list of builds.

fixup bad hand merge

Merge IGNORE_STYLE change and my change.

Regression: See if using subprocess instead of os.system and erroring immediately will stop regression randomly hanging.

style: If IGNORE_STYLE=True is set on the scons command line, ignore style.
Use this in the regress script to avoid issues with the checker.

fix regress... SPARC_FS may not be in the builds so check for it

If we're running the quick tests, remove the SPARC_FS build since we don't have any quick SPARC_FS tests at the moment

add a sparc fs regression

src/dev/sparc/iob.cc:
don't warn on cpu restart/idle/halt stuff
tests/SConscript:
add sparc target in test Sconscript
util/regress:
Add SPARC_FS target in regress

If no tests are specified for regression, just build the binaries
(instead of complaining and exiting).

Merge zizzer.eecs.umich.edu:/z/stever/bk/newmem-cache2
into zizzer.eecs.umich.edu:/z/stever/bk/newmem-cache3

Add '-j' option directly to regress script (passed to scons).

Change detault regression build from opt to fast.

regress:
Clean up help output.

util/regress:
Clean up help output.

Get rid of extra stuff in util/regress only needed by cron job,
to make it more usable by regular folks.

util/regress:
Get rid of extra stuff only needed by cron job,
to make it more usable by regular folks.

Update for new regression test structure.

Commit regression script. The cron job uses a copy in m5test's
home directory (/z/m5/regression), so for now any modifications
should be manually copied there as well.

Note that this script is designed to be useful for running full
regressions outside of the cron job as well.