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import os
import subprocess
# toolchains options
ARCH ='aarch64'
CPU ='cortex-a'
CROSS_TOOL ='gcc'
if os.getenv('RTT_ROOT'):
RTT_ROOT = os.getenv('RTT_ROOT')
else:
RTT_ROOT = r'../../..'
if os.getenv('RTT_CC'):
CROSS_TOOL = os.getenv('RTT_CC')
PLATFORM = 'gcc'
EXEC_PATH = r'/opt/gcc-arm-8.3-2019.03-x86_64-aarch64-elf/bin/'
if os.getenv('RTT_EXEC_PATH'):
EXEC_PATH = os.getenv('RTT_EXEC_PATH')
PREFERRED_MTUNE = 'cortex-a76'
MTUNE_FALLBACKS = ('cortex-a73', 'generic')
def _gcc_supports_mtune(cc, exec_path, march, tune):
env = os.environ.copy()
if exec_path:
env['PATH'] = exec_path + os.pathsep + env.get('PATH', '')
try:
ret = subprocess.run(
[cc, '-march=' + march, '-mtune=' + tune, '-c', '-x', 'c', '-', '-o', os.devnull],
input=b'',
stdout=subprocess.DEVNULL,
stderr=subprocess.DEVNULL,
env=env,
check=False,
)
return ret.returncode == 0
except (OSError, subprocess.SubprocessError):
return False
def resolve_mtune(cc, exec_path, preferred=PREFERRED_MTUNE, march='armv8-a',
fallbacks=MTUNE_FALLBACKS):
for tune in (preferred,) + fallbacks:
if _gcc_supports_mtune(cc, exec_path, march, tune):
if tune != preferred:
print('Note: %s does not support -mtune=%s, using -mtune=%s' % (
cc, preferred, tune))
return tune
return fallbacks[-1]
BUILD = 'debug'
if PLATFORM == 'gcc':
# toolchains
PREFIX = os.getenv('RTT_CC_PREFIX') or 'aarch64-none-elf-'
CC = PREFIX + 'gcc'
CXX = PREFIX + 'g++'
CPP = PREFIX + 'cpp'
AS = PREFIX + 'gcc'
AR = PREFIX + 'ar'
LINK = PREFIX + 'gcc'
TARGET_EXT = 'elf'
SIZE = PREFIX + 'size'
OBJDUMP = PREFIX + 'objdump'
OBJCPY = PREFIX + 'objcopy'
MTUNE = resolve_mtune(CC, EXEC_PATH)
DEVICE = ' -march=armv8-a -mtune=%s -fdiagnostics-color=always' % MTUNE
CPPFLAGS = ' -nostdinc -undef -E -P -x assembler-with-cpp'
CFLAGS = DEVICE + ' -Wall -Wno-cpp -D_POSIX_SOURCE'
AFLAGS = ' -c' + ' -x assembler-with-cpp -D__ASSEMBLY__'
LFLAGS = DEVICE + ' -Wl,--gc-sections,-Map=rtthread.map,-cref,-u,system_vectors -T link.lds'
CPATH = ''
LPATH = ''
if BUILD == 'debug':
CFLAGS += ' -O0 -ggdb'
AFLAGS += ' -ggdb'
else:
CFLAGS += ' -O2'
CXXFLAGS = CFLAGS
DUMP_ACTION = OBJDUMP + ' -D -S $TARGET > rtt.asm\n'
POST_ACTION = OBJCPY + ' -O binary $TARGET rtthread.bin\n' + SIZE + ' $TARGET \n'
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