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#!/usr/bin/env python3
##===----------------------------------------------------------------------===##
##
## This source file is part of the SwiftCrypto open source project
##
## Copyright (c) 2019-2022 Apple Inc. and the SwiftCrypto project authors
## Licensed under Apache License v2.0
##
## See LICENSE.txt for license information
## See CONTRIBUTORS.md for the list of SwiftCrypto project authors
##
## SPDX-License-Identifier: Apache-2.0
##
##===----------------------------------------------------------------------===##
import contextlib
import subprocess
import os
# OS_ARCH_COMBOS maps from OS and platform to the OpenSSL assembly "style" for
# that platform and the extension used by asm files.
OS_ARCH_COMBOS = [
('ios', 'arm', 'ios32', [], 'S'),
('ios', 'aarch64', 'ios64', [], 'S'),
('linux', 'arm', 'linux32', [], 'S'),
('linux', 'aarch64', 'linux64', [], 'S'),
('linux', 'x86', 'elf', ['-fPIC', '-DOPENSSL_IA32_SSE2'], 'S'),
('linux', 'x86_64', 'elf', [], 'S'),
('mac', 'x86_64', 'macosx', [], 'S'),
# ('windows', 'aarch64', 'coff', [], 'S'),
# ('windows', 'arm', 'coff', [], 'S'),
('windows', 'x86', 'win32n', [], 'S'),
# ('windows', 'x86_64', 'coff', [], 'S'),
]
# NON_PERL_FILES enumerates assembly files that are not processed by the
# perlasm system.
NON_PERL_FILES = {
('linux', 'arm'): [
'boringssl/crypto/curve25519/asm/x25519-asm-arm.S',
'boringssl/crypto/poly1305/poly1305_arm_asm.S',
],
('linux', 'x86_64'): [
'boringssl/crypto/hrss/asm/poly_rq_mul.S',
],
}
def FindCMakeFiles(directory):
"""Returns list of all CMakeLists.txt files recursively in directory."""
cmakefiles = []
for (path, _, filenames) in os.walk(directory):
for filename in filenames:
if filename == 'CMakeLists.txt':
cmakefiles.append(os.path.join(path, filename))
return cmakefiles
def ExtractPerlAsmFromCMakeFile(cmakefile):
"""Parses the contents of the CMakeLists.txt file passed as an argument and
returns a list of all the perlasm() directives found in the file."""
perlasms = []
with open(cmakefile) as f:
for line in f:
line = line.strip()
if not line.startswith('perlasm('):
continue
if not line.endswith(')'):
raise ValueError('Bad perlasm line in %s' % cmakefile)
# Remove "perlasm(" from start and ")" from end
params = line[8:-1].split()
if len(params) != 4:
raise ValueError('Bad perlasm line in %s' % cmakefile)
perlasms.append({
'arch': params[1],
'output': os.path.join(os.path.dirname(cmakefile), params[2]),
'input': os.path.join(os.path.dirname(cmakefile), params[3]),
})
return perlasms
def ReadPerlAsmOperations():
"""Returns a list of all perlasm() directives found in CMake config files in
src/."""
perlasms = []
cmakefiles = FindCMakeFiles('boringssl')
for cmakefile in cmakefiles:
perlasms.extend(ExtractPerlAsmFromCMakeFile(cmakefile))
return perlasms
def PerlAsm(output_filename, input_filename, perlasm_style, extra_args):
"""Runs the a perlasm script and puts the output into output_filename."""
base_dir = os.path.dirname(output_filename)
if not os.path.isdir(base_dir):
os.makedirs(base_dir)
subprocess.check_call(
['perl', input_filename, perlasm_style] + extra_args + [output_filename])
def WriteAsmFiles(perlasms):
"""Generates asm files from perlasm directives for each supported OS x
platform combination."""
asmfiles = {}
for perlasm in perlasms:
for (osname, arch, perlasm_style, extra_args, asm_ext) in OS_ARCH_COMBOS:
if arch != perlasm['arch']:
continue
key = (osname, arch)
outDir = '%s-%s' % key
filename = os.path.basename(perlasm['input'])
output = perlasm['output']
if not output.startswith('boringssl/crypto'):
raise ValueError('output missing crypto: %s' % output)
output = os.path.join(outDir, output[17:])
output = '%s-%s.%s' % (output, osname, asm_ext)
PerlAsm(output, perlasm['input'], perlasm_style, extra_args)
asmfiles.setdefault(key, []).append(output)
return asmfiles
def preprocessor_arch_for_arch(arch):
if arch == "arm":
return "__arm__"
elif arch == "aarch64":
return "__aarch64__"
elif arch == "x86":
return "__i386__"
elif arch == "x86_64":
return "__x86_64__"
def preprocessor_platform_for_os(osname):
if osname == 'mac' or osname == 'ios':
return '__APPLE__'
elif osname == 'linux':
return '__linux__'
elif osname == 'windows':
return '_WIN32'
def asm_target(osname, arch, asm):
components = asm.split('/')
new_components = ["boringssl/crypto"] + components[1:-1] + [components[-1].replace('.S', '.' + osname + '.' + arch + '.S')]
return '/'.join(new_components)
def munge_file(pp_arch, pp_platform, source_lines, sink):
"""
Wraps a single assembly file in appropriate defines.
"""
sink.write(b"#if defined(%b) && defined(%b)\n" % (pp_arch.encode(), pp_platform.encode()))
for line in source_lines:
sink.write(line)
sink.write(b"#endif // defined(%b) && defined(%b)\n" % (pp_arch.encode(), pp_platform.encode()))
def munge_all_files(osname, arch, asms):
"""
Puts the appropriate architecture #ifdefs around the asm.
"""
for asm in asms:
pp_arch = preprocessor_arch_for_arch(arch)
pp_platform = preprocessor_platform_for_os(osname)
target = asm_target(osname, arch, asm)
with open(asm, 'rb') as source:
with open(target, 'wb') as sink:
munge_file(pp_arch, pp_platform, source, sink)
def main():
# First, we build all the .S files using the helper from boringssl.
asm_outputs = WriteAsmFiles(ReadPerlAsmOperations())
# Now we need to bring over all the .S files, inserting our preprocessor
# directives along the way. We do this to allow the C preprocessor to make
# unneeded assembly files vanish.
for ((osname, arch), asm_files) in asm_outputs.items():
munge_all_files(osname, arch, asm_files)
for ((osname, arch), asm_files) in NON_PERL_FILES.items():
for asm_file in asm_files:
with open(asm_file, 'rb') as f:
lines = f.readlines()
pp_arch = preprocessor_arch_for_arch(arch)
pp_platform = preprocessor_platform_for_os(osname)
with open(asm_file, 'wb') as sink:
munge_file(pp_arch, pp_platform, lines, sink)
if __name__ == '__main__':
main()
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