3 # Copyright (c) 2006 The Regents of The University of Michigan
6 # Redistribution and use in source and binary forms, with or without
7 # modification, are permitted provided that the following conditions are
8 # met: redistributions of source code must retain the above copyright
9 # notice, this list of conditions and the following disclaimer;
10 # redistributions in binary form must reproduce the above copyright
11 # notice, this list of conditions and the following disclaimer in the
12 # documentation and/or other materials provided with the distribution;
13 # neither the name of the copyright holders nor the names of its
14 # contributors may be used to endorse or promote products derived from
15 # this software without specific prior written permission.
17 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
19 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
20 # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
21 # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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24 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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27 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 # Import build environment variable from SConstruct.
34 # Right now there are no source files immediately in this directory
37 #################################################################
39 # ISA "switch header" generation.
41 # Auto-generate arch headers that include the right ISA-specific
42 # header based on the setting of THE_ISA preprocessor variable.
44 #################################################################
46 # List of headers to generate
47 isa_switch_hdrs = Split('''
51 # Generate the header. target[0] is the full path of the output
52 # header to generate. 'source' is a dummy variable, since we get the
53 # list of ISAs from env['ALL_ISA_LIST'].
54 def gen_switch_hdr(target, source, env):
55 fname = str(target[0])
56 basename = os.path.basename(fname)
58 f.write('#include "arch/isa_specific.hh"\n')
60 for isa in env['ALL_ISA_LIST']:
61 f.write('%s THE_ISA == %s_ISA\n#include "arch/%s/%s"\n'
62 % (cond, isa.upper(), isa, basename))
64 f.write('#else\n#error "THE_ISA not set"\n#endif\n')
68 # String to print when generating header
69 def gen_switch_hdr_string(target, source, env):
70 return "Generating ISA switch header " + str(target[0])
72 # Build SCons Action object. 'varlist' specifies env vars that this
73 # action depdnds on; when env['ALL_ISA_LIST'] changes these actions
74 # should get re-executed.
75 switch_hdr_action = Action(gen_switch_hdr, gen_switch_hdr_string,
76 varlist=['ALL_ISA_LIST'])
78 # Instantiate actions for each header
79 for hdr in isa_switch_hdrs:
80 env.Command(hdr, [], switch_hdr_action)
82 #################################################################
84 # Include architecture-specific files.
86 #################################################################
89 # Build a SCons scanner for ISA files
94 return SCons.Scanner.Classic("ISAScan",
97 '^[ \t]*##[ \t]*include[ \t]*"([^>"]+)"')
99 def ISAPath(env, dir, target=None, source=None, a=None):
100 return (Dir(env['SRCDIR']), Dir('.'))
102 iscan = Scanner(function = ISAScan().scan, skeys = [".isa", ".ISA"],
103 path_function = ISAPath)
104 env.Append(SCANNERS = iscan)
107 # Now create a Builder object that uses isa_parser.py to generate C++
108 # output from the ISA description (*.isa) files.
111 # Convert to File node to fix path
112 isa_parser = File('isa_parser.py')
113 cpu_models_file = File('#m5/cpu/cpu_models.py')
115 # This sucks in the defintions of the CpuModel objects.
116 execfile(cpu_models_file.srcnode().abspath)
118 # Several files are generated from the ISA description.
119 # We always get the basic decoder and header file.
120 isa_desc_gen_files = Split('decoder.cc decoder.hh')
121 # We also get an execute file for each selected CPU model.
122 isa_desc_gen_files += [CpuModel.dict[cpu].filename
123 for cpu in env['CPU_MODELS']]
125 # The emitter patches up the sources & targets to include the
126 # autogenerated files as targets and isa parser itself as a source.
127 def isa_desc_emitter(target, source, env):
128 return (isa_desc_gen_files, [isa_parser, cpu_models_file] + source)
130 # Pieces are in place, so create the builder.
131 isa_desc_builder = Builder(action='$SOURCES $TARGET.dir $CPU_MODELS',
132 source_scanner = iscan,
133 emitter = isa_desc_emitter)
135 env.Append(BUILDERS = { 'ISADesc' : isa_desc_builder })
138 # Now include other ISA-specific sources from the ISA subdirectories.
141 isa = env['TARGET_ISA'] # someday this may be a list of ISAs
143 # Let the target architecture define what additional sources it needs
144 sources += SConscript(os.path.join(isa, 'SConscript'),
145 exports = 'env', duplicate = False)