SConscript revision 12109 
1# -*- mode:python -*-
2
3# Copyright (c) 2016 ARM Limited
4# All rights reserved.
5#
6# The license below extends only to copyright in the software and shall
7# not be construed as granting a license to any other intellectual
8# property including but not limited to intellectual property relating
9# to a hardware implementation of the functionality of the software
10# licensed hereunder.  You may use the software subject to the license
11# terms below provided that you ensure that this notice is replicated
12# unmodified and in its entirety in all distributions of the software,
13# modified or unmodified, in source code or in binary form.
14#
15# Copyright (c) 2006 The Regents of The University of Michigan
16# All rights reserved.
17#
18# Redistribution and use in source and binary forms, with or without
19# modification, are permitted provided that the following conditions are
20# met: redistributions of source code must retain the above copyright
21# notice, this list of conditions and the following disclaimer;
22# redistributions in binary form must reproduce the above copyright
23# notice, this list of conditions and the following disclaimer in the
24# documentation and/or other materials provided with the distribution;
25# neither the name of the copyright holders nor the names of its
26# contributors may be used to endorse or promote products derived from
27# this software without specific prior written permission.
28#
29# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
30# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
31# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
32# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
33# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
34# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
35# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
36# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
37# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
38# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
39# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
40#
41# Authors: Steve Reinhardt
42
43import sys
44import os
45import re
46
47Import('*')
48
49#################################################################
50#
51# ISA "switch header" generation.
52#
53# Auto-generate arch headers that include the right ISA-specific
54# header based on the setting of THE_ISA preprocessor variable.
55#
56#################################################################
57
58env.SwitchingHeaders(
59    Split('''
60        decoder.hh
61        interrupts.hh
62        isa.hh
63        isa_traits.hh
64        kernel_stats.hh
65        locked_mem.hh
66        microcode_rom.hh
67        mmapped_ipr.hh
68        mt.hh
69        process.hh
70        pseudo_inst.hh
71        registers.hh
72        remote_gdb.hh
73        stacktrace.hh
74        tlb.hh
75        types.hh
76        utility.hh
77        vtophys.hh
78        '''),
79    env.subst('${TARGET_ISA}'))
80
81if env['BUILD_GPU']:
82    env.SwitchingHeaders(
83        Split('''
84            gpu_decoder.hh
85            gpu_isa.hh
86            gpu_types.hh
87            '''),
88        env.subst('${TARGET_GPU_ISA}'))
89
90#################################################################
91#
92# Include architecture-specific files.
93#
94#################################################################
95
96#
97# Build a SCons scanner for ISA files
98#
99import SCons.Scanner
100
101isa_scanner = SCons.Scanner.Classic("ISAScan",
102                                    [".isa", ".ISA"],
103                                    "SRCDIR",
104                                    r'^\s*##include\s+"([\w/.-]*)"')
105
106env.Append(SCANNERS = isa_scanner)
107
108#
109# Now create a Builder object that uses isa_parser.py to generate C++
110# output from the ISA description (*.isa) files.
111#
112
113isa_parser = File('isa_parser.py')
114
115# The emitter patches up the sources & targets to include the
116# autogenerated files as targets and isa parser itself as a source.
117def isa_desc_emitter(target, source, env):
118    # List the isa parser as a source.
119    source += [
120        isa_parser,
121        Value("ExecContext"),
122        ]
123
124    # Specify different targets depending on if we're running the ISA
125    # parser for its dependency information, or for the generated files.
126    # (As an optimization, the ISA parser detects the useless second run
127    # and skips doing any work, if the first run was performed, since it
128    # always generates all its files). The way we track this in SCons is the
129    # <arch>_isa_outputs value in the environment (env). If it's unset, we
130    # don't know what the dependencies are so we ask for generated/inc.d to
131    # be generated so they can be acquired. If we know what they are, then
132    # it's because we've already processed inc.d and then claim that our
133    # outputs (targets) will be thus.
134    isa = env['TARGET_ISA']
135    key = '%s_isa_outputs' % isa
136    if key in env:
137        targets = [ os.path.join('generated', f) for f in env[key] ]
138    else:
139        targets = [ os.path.join('generated','inc.d') ]
140
141    def prefix(s):
142        return os.path.join(target[0].dir.up().abspath, s)
143
144    return [ prefix(t) for t in targets ], source
145
146ARCH_DIR = Dir('.')
147
148# import ply here because SCons screws with sys.path when performing actions.
149import ply
150
151def isa_desc_action_func(target, source, env):
152    # Add the current directory to the system path so we can import files
153    sys.path[0:0] = [ ARCH_DIR.srcnode().abspath ]
154    import isa_parser
155
156    # Skip over the ISA description itself and the parser to the CPU models.
157    models = [ s.get_contents() for s in source[2:] ]
158    parser = isa_parser.ISAParser(target[0].dir.abspath)
159    parser.parse_isa_desc(source[0].abspath)
160isa_desc_action = MakeAction(isa_desc_action_func, Transform("ISA DESC", 1))
161
162# Also include the CheckerCPU as one of the models if it is being
163# enabled via command line.
164isa_desc_builder = Builder(action=isa_desc_action, emitter=isa_desc_emitter)
165
166env.Append(BUILDERS = { 'ISADesc' : isa_desc_builder })
167
168# The ISA is generated twice: the first time to find out what it generates,
169# and the second time to make scons happy by telling the ISADesc builder
170# what it will make before it builds it.
171def scan_isa_deps(target, source, env):
172    # Process dependency file generated by the ISA parser --
173    # add the listed files to the dependency tree of the build.
174    source = source[0]
175    archbase = source.dir.up().path
176
177    try:
178        depfile = open(source.abspath, 'r')
179    except:
180        print "scan_isa_deps: Can't open ISA deps file '%s' in %s" % \
181              (source.path,os.getcwd())
182        raise
183
184    # Scan through the lines
185    targets = {}
186    for line in depfile:
187        # Read the dependency line with the format
188        # <target file>: [ <dependent file>* ]
189        m = re.match(r'^\s*([^:]+\.([^\.:]+))\s*:\s*(.*)', line)
190        assert(m)
191        targ, extn = m.group(1,2)
192        deps = m.group(3).split()
193
194        files = [ targ ] + deps
195        for f in files:
196            targets[f] = True
197            # Eliminate unnecessary re-generation if we already generated it
198            env.Precious(os.path.join(archbase, 'generated', f))
199
200        files = [ os.path.join(archbase, 'generated', f) for f in files ]
201
202        if extn == 'cc':
203            Source(os.path.join(archbase,'generated', targ))
204    depfile.close()
205    env[env['TARGET_ISA'] + '_isa_outputs'] = targets.keys()
206
207    isa = env.ISADesc(os.path.join(archbase,'isa','main.isa'))
208    for t in targets:
209        env.Depends('#all-isas', isa)
210
211env.Append(BUILDERS = {'ScanISA' :
212                        Builder(action=MakeAction(scan_isa_deps,
213                                                  Transform("NEW DEPS", 1)))})
214
215DebugFlag('IntRegs')
216DebugFlag('FloatRegs')
217DebugFlag('VecRegs')
218DebugFlag('CCRegs')
219DebugFlag('MiscRegs')
220CompoundFlag('Registers', [ 'IntRegs', 'FloatRegs', 'CCRegs', 'MiscRegs' ])
221