40b79073f0
Using mechanisms added in previous CLs, this change modifies the m5 utility so that it can use any of the back ends enabled and implemented by each variant, defaulting to one particular implementation if not is selected explicitly. On x86, the default mechanism is the magic address. All other variants default to the magic instruction since they don't have a well established address to use or even in most cases an implementation to use. The ability to override the particular magic address the utility wants to use (necessary on variants such as aarch64) will be added in a future CL. Change-Id: I5fc414740e30759e7dde719cddcc8d5d41f8cc74 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/27242 Reviewed-by: Jason Lowe-Power <power.jg@gmail.com> Reviewed-by: Pouya Fotouhi <pfotouhi@ucdavis.edu> Maintainer: Gabe Black <gabeblack@google.com> Tested-by: kokoro <noreply+kokoro@google.com>
113 lines
4.4 KiB
Python
113 lines
4.4 KiB
Python
# Copyright 2020 Google, Inc.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are
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# met: redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer;
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# redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution;
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# neither the name of the copyright holders nor the names of its
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# contributors may be used to endorse or promote products derived from
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# this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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import copy
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import os
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main = Environment()
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# Includes which are shared with gem5 itself.
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common_include = Dir('..').Dir('..').Dir('include')
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src_dir = Dir('src')
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build_dir = Dir('build')
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def abspath(d):
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return os.path.abspath(str(d))
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# Universal settings.
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main.Append(CCFLAGS=[ '-O2' ])
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main.Append(CPPPATH=[ common_include ])
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# Propogate the environment's PATH setting.
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main['ENV']['PATH'] = os.environ['PATH']
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main['CC'] = '${CROSS_COMPILE}gcc'
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main['AS'] = '${CROSS_COMPILE}as'
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main['LD'] = '${CROSS_COMPILE}ld'
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main['AR'] = '${CROSS_COMPILE}ar'
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# Detect some dependencies of some forms of the m5 utility/library.
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main['HAVE_JAVA'] = all(key in main for key in ('JAVAC', 'JAR'))
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main['HAVE_PKG_CONFIG'] = main.Detect('pkg-config') is not None
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main['HAVE_LUA51'] = (main['HAVE_PKG_CONFIG'] and
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os.system('pkg-config --exists lua51') == 0)
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# Put the sconsign file in the build dir so everything can be deleted at once.
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main.SConsignFile(os.path.join(abspath(build_dir), 'sconsign'))
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# Use soft links instead of hard links when setting up a build directory.
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main.SetOption('duplicate', 'soft-copy')
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class CallType(object):
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def __init__(self, name):
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self.name = name
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self.impl_file = None
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self.enabled = False
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self.default = False
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def impl(self, impl, default=False):
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self.impl_file = impl
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self.enabled = True
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self.default = default
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call_types = {
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# Magic instruction.
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'inst': CallType('inst'),
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# Magic address.
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'addr': CallType('addr'),
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# Semihosting extension.
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'semi': CallType('semi'),
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}
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for root, dirs, files in os.walk(abspath(src_dir)):
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# Each SConsopts file describes a variant of the m5 utility.
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if 'SConsopts' in files:
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env = main.Clone()
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env['CALL_TYPE'] = copy.deepcopy(call_types)
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# The user may override variant settings by setting environment
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# variables of the form ${VARIANT}.${OPTION}. For instance, to set the
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# CROSS_COMPILE prefix for variant foo to bar-, the user would set an
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# environment variable foo.CROSS_COMPILE=bar-.
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#
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# This also considers scons command line settings which may look like
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# environment variables, but are set after "scons" on the command line.
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def get_variant_opt(name, default):
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var_name = env.subst('${VARIANT}.%s' % name)
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env[name] = os.environ.get(
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var_name, ARGUMENTS.get(var_name, default))
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# Process the variant's settings in the SConsopts file, storing them
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# in a copy of the primary environment.
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env.SConscript(Dir(root).File('SConsopts'),
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exports=[ 'env', 'get_variant_opt' ])
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# Once all the options have been configured, set up build targets for
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# this variant.
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variant_dir = build_dir.Dir(env.subst('${VARIANT}'))
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env.SConscript(src_dir.File('SConscript'),
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variant_dir=variant_dir, exports='env')
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