forked from cirosantilli/linux-kernel-module-cheat
/
build-baremetal
executable file
·147 lines (141 loc) · 5.84 KB
/
build-baremetal
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#!/usr/bin/env python3
import os
import common
import thread_pool
from shell_helpers import LF
class Main(common.BuildCliFunction):
def __init__(self):
super().__init__(
defaults={
'gcc_which': 'crosstool-ng',
'mode': 'baremetal',
},
description='''\
Build the baremetal examples with crosstool-NG.
''',
)
self._add_argument('--ccflags')
self._add_argument('--force-rebuild')
self._add_argument('--optimization-level')
self.add_argument(
'targets',
default=[],
help='Analogous to ./build-userland target selection',
nargs='*',
)
def build(self):
build_dir = self.get_build_dir()
extra_obj_baremetal_bootloader = os.path.join(
self.env['baremetal_build_lib_dir'],
'bootloader{}'.format(self.env['obj_ext'])
)
extra_obj_lkmc_common = os.path.join(
self.env['baremetal_build_lib_dir'],
self.env['common_basename_noext'] + self.env['obj_ext']
)
syscalls_basename_noext = 'syscalls'
syscalls_src = os.path.join(
self.env['baremetal_source_lib_dir'],
syscalls_basename_noext + self.env['c_ext']
)
syscalls_obj = os.path.join(
self.env['baremetal_build_lib_dir'],
syscalls_basename_noext + self.env['obj_ext']
)
cc_flags = [
'-I', self.env['root_dir'], LF,
'-O{}'.format(self.env['optimization_level']), LF,
'-nostartfiles', LF,
]
if self.env['arch'] == 'arm':
cc_flags.extend([
'-mhard-float', LF,
# This uses the soft float ABI for calling functions from objets in Newlib which
# our crosstool-NG config compiles with soft floats, while emiting hard float
# from C and allowing us to use it from assembly, e.g. for the VMRS instruction:
# which would otherwise fail "with selected processor does not support XXX in ARM mode"
# Bibliography:
# - https://stackoverflow.com/questions/9753749/arm-compilation-error-vfp-registered-used-by-executable-not-object-file
# - https://stackoverflow.com/questions/41131432/cross-compiling-error-selected-processor-does-not-support-fmrx-r3-fpexc-in/41131782#41131782
# - https://embeddedartistry.com/blog/2017/10/9/r1q7pksku2q3gww9rpqef0dnskphtc
'-mfloat-abi=softfp', LF,
'-mfpu=crypto-neon-fp-armv8', LF,
])
if self.env['emulator'] == 'gem5':
if self.env['machine'] == 'VExpress_GEM5_V1':
entry_address = 0x80000000
uart_address = 0x1c090000
elif self.env['machine'] == 'RealViewPBX':
entry_address = 0x10000
uart_address = 0x10009000
else:
raise Exception('unknown machine: ' + self.env['machine'])
cc_flags.extend([
'-DLKMC_GEM5=1', LF,
'-DLKMC_M5OPS_ENABLE=1', LF,
])
else:
entry_address = 0x40000000
uart_address = 0x09000000
cc_flags.extend(['-D', 'LKMC_UART0_ADDR={:#x}'.format(uart_address), LF])
cc_flags.extend(self.sh.shlex_split(self.env['ccflags']))
bootloader_src = os.path.join(
self.env['baremetal_source_lib_dir'],
'{}{}'.format(
self.env['arch'],
self.env['asm_ext']
)
)
for in_path, out_path in [
(bootloader_src, extra_obj_baremetal_bootloader),
(self.env['common_c'], extra_obj_lkmc_common),
(syscalls_src, syscalls_obj),
]:
self._build_one(
in_path=in_path,
out_path=out_path,
cc_flags=cc_flags,
extra_deps=[self.env['common_h']],
link=False,
)
cc_flags.extend([
'-Wl,--section-start=.text={:#x}'.format(entry_address), LF,
'-T', self.env['baremetal_link_script'], LF,
])
with thread_pool.ThreadPool(
self._build_one,
nthreads=self.env['nproc'],
submit_raise_exit=self.env['quit_on_fail'],
) as my_thread_pool:
for target in self.env['targets']:
for path, in_dirnames, in_filenames in self.sh.walk(target):
for in_filename in in_filenames:
in_ext = os.path.splitext(in_filename)[1]
if not in_ext in self.env['baremetal_build_in_exts']:
continue
in_path = os.path.join(path, in_filename)
my_thread_pool.submit({
'cc_flags': cc_flags,
'extra_deps': [
self.env['baremetal_link_script'],
self.env['common_h']
],
'extra_objs': [syscalls_obj],
'extra_objs_baremetal_bootloader': [extra_obj_baremetal_bootloader],
'extra_objs_lkmc_common': [extra_obj_lkmc_common],
'in_path': in_path,
'out_path': self.resolve_baremetal_executable(in_path),
})
return self._handle_thread_pool_errors(my_thread_pool)
def get_build_dir(self):
return self.env['baremetal_build_dir']
def setup_one(self):
self.env['targets'] = self.resolve_targets(
[
self.env['baremetal_source_dir'],
self.env['userland_source_dir']
],
self.env['targets']
)
if __name__ == '__main__':
Main().cli()