1# Copyright (c) 2015 ARM Limited
2# All rights reserved.
3#
4# The license below extends only to copyright in the software and shall
5# not be construed as granting a license to any other intellectual
6# property including but not limited to intellectual property relating
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8# licensed hereunder. You may use the software subject to the license
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15# met: redistributions of source code must retain the above copyright
16# notice, this list of conditions and the following disclaimer;
17# redistributions in binary form must reproduce the above copyright
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22# this software without specific prior written permission.
23#
24# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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35#
36# Authors: Andreas Sandberg
37
38from multiprocessing import Process
39import sys
40import os
41
42import m5
43m5.util.addToPath('../configs/common')
43
44_exit_normal = (
45 "target called exit()",
46 "m5_exit instruction encountered",
47 )
48
49_exit_limit = (
50 "simulate() limit reached",
51 )
52
53_exitcode_done = 0
54_exitcode_fail = 1
55_exitcode_checkpoint = 42
56
57
58def _run_step(name, restore=None, interval=0.5):
59 """
60 Instantiate (optionally from a checkpoint if restore is set to the
61 checkpoitn name) the system and run for interval seconds of
62 simulated time. At the end of the simulation interval, create a
63 checkpoint and exit.
64
65 As this function is intended to run in its own process using the
66 multiprocessing framework, the exit is a true call to exit which
67 terminates the process. Exit codes are used to pass information to
68 the parent.
69 """
70 if restore is not None:
71 m5.instantiate(restore)
72 else:
73 m5.instantiate()
74
75 e = m5.simulate(m5.ticks.fromSeconds(interval))
76 cause = e.getCause()
77 if cause in _exit_limit:
78 m5.checkpoint(name)
79 sys.exit(_exitcode_checkpoint)
80 elif cause in _exit_normal:
81 sys.exit(_exitcode_done)
82 else:
83 print "Test failed: Unknown exit cause: %s" % cause
84 sys.exit(_exitcode_fail)
85
86def run_test(root, interval=0.5, max_checkpoints=5):
87 """
88 Run the simulated system for a fixed amount of time and take a
89 checkpoint, then restore from the same checkpoint and run until
90 the system calls m5 exit.
91 """
92
93 cpt_name = os.path.join(m5.options.outdir, "test.cpt")
94 restore = None
95
96 for cpt_no in range(max_checkpoints):
97 # Create a checkpoint from a separate child process. This enables
98 # us to get back to a (mostly) pristine state and restart
99 # simulation from the checkpoint.
100 p = Process(target=_run_step,
101 args=(cpt_name, ),
102 kwargs={
103 "restore" : restore,
104 "interval" : interval,
105 })
106 p.start()
107
108 # Wait for the child to return
109 p.join()
110
111 # Restore from the checkpoint next iteration
112 restore = cpt_name
113
114 if p.exitcode == _exitcode_done:
115 print >> sys.stderr, "Test done."
116 sys.exit(0)
117 elif p.exitcode == _exitcode_checkpoint:
118 pass
119 else:
120 print >> sys.stderr, "Test failed."
121 sys.exit(1)
122
123 # Maximum number of checkpoints reached. Just run full-speed from
124 # now on.
125 m5.instantiate()
126 e = m5.simulate()
127 cause = e.getCause()
128 if cause in _exit_normal:
129 sys.exit(0)
130 else:
131 print "Test failed: Unknown exit cause: %s" % cause
132 sys.exit(1)