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# Copyright (c) 2015 ARM Limited
# All rights reserved.
#
# The license below extends only to copyright in the software and shall
# not be construed as granting a license to any other intellectual
# property including but not limited to intellectual property relating
# to a hardware implementation of the functionality of the software
# licensed hereunder. You may use the software subject to the license
# terms below provided that you ensure that this notice is replicated
# unmodified and in its entirety in all distributions of the software,
# modified or unmodified, in source code or in binary form.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met: redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer;
# redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution;
# neither the name of the copyright holders nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
# Authors: Andreas Sandberg
from __future__ import print_function
from multiprocessing import Process
import sys
import os
import m5
_exit_normal = (
"target called exit()",
"m5_exit instruction encountered",
)
_exit_limit = (
"simulate() limit reached",
)
_exitcode_done = 0
_exitcode_fail = 1
_exitcode_checkpoint = 42
def _run_step(name, restore=None, interval=0.5):
"""
Instantiate (optionally from a checkpoint if restore is set to the
checkpoitn name) the system and run for interval seconds of
simulated time. At the end of the simulation interval, create a
checkpoint and exit.
As this function is intended to run in its own process using the
multiprocessing framework, the exit is a true call to exit which
terminates the process. Exit codes are used to pass information to
the parent.
"""
if restore is not None:
m5.instantiate(restore)
else:
m5.instantiate()
e = m5.simulate(m5.ticks.fromSeconds(interval))
cause = e.getCause()
if cause in _exit_limit:
m5.checkpoint(name)
sys.exit(_exitcode_checkpoint)
elif cause in _exit_normal:
sys.exit(_exitcode_done)
else:
print("Test failed: Unknown exit cause: %s" % cause)
sys.exit(_exitcode_fail)
def run_test(root, interval=0.5, max_checkpoints=5):
"""
Run the simulated system for a fixed amount of time and take a
checkpoint, then restore from the same checkpoint and run until
the system calls m5 exit.
"""
cpt_name = os.path.join(m5.options.outdir, "test.cpt")
restore = None
for cpt_no in range(max_checkpoints):
# Create a checkpoint from a separate child process. This enables
# us to get back to a (mostly) pristine state and restart
# simulation from the checkpoint.
p = Process(target=_run_step,
args=(cpt_name, ),
kwargs={
"restore" : restore,
"interval" : interval,
})
p.start()
# Wait for the child to return
p.join()
# Restore from the checkpoint next iteration
restore = cpt_name
if p.exitcode == _exitcode_done:
print("Test done.", file=sys.stderr)
sys.exit(0)
elif p.exitcode == _exitcode_checkpoint:
pass
else:
print("Test failed.", file=sys.stderr)
sys.exit(1)
# Maximum number of checkpoints reached. Just run full-speed from
# now on.
m5.instantiate()
e = m5.simulate()
cause = e.getCause()
if cause in _exit_normal:
sys.exit(0)
else:
print("Test failed: Unknown exit cause: %s" % cause)
sys.exit(1)
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