seL4-microkit/build_sdk.py

"""The SDK build script.

# Why Python (and not make, or something else)?

We call out to Make, but having this top-level driver script
is useful.

There are just a lot of things that are much easier in Python
than in make.

"""
from argparse import ArgumentParser
from os import popen, system
from shutil import copy
from pathlib import Path
from dataclasses import dataclass
from tarfile import open as tar_open, TarInfo

from typing import Dict, Union

NAME = "sel4cp"
VERSION = "1.2.6"

SEL4CP_EPOCH = 1616367257

KERNEL_CONFIG_TYPE = Union[bool, str]
KERNEL_OPTIONS = Dict[str, KERNEL_CONFIG_TYPE]

@dataclass
class BoardInfo:
    name: str
    gcc_cpu: str
    kernel_options: KERNEL_CONFIG_TYPE
    examples: Dict[str, Path]


@dataclass
class ConfigInfo:
    name: str
    debug: bool
    kernel_options: KERNEL_CONFIG_TYPE


SUPPORTED_BOARDS = (
    BoardInfo(
        name="tqma8xqp1gb",
        gcc_cpu="cortex-a35",
        kernel_options = {
            "KernelPlatform": "tqma8xqp1gb",
            "KernelIsMCS": True,
            "KernelArmExportPCNTUser": True,
        },
        examples = {
            "ethernet": Path("example/tqma8xqp1gb/ethernet")
        }
),)

SUPPORTED_CONFIGS = (
    ConfigInfo(
        name="release",
        debug=False,
        kernel_options = {},
    ),
    ConfigInfo(
        name="debug",
        debug=True,
        kernel_options = {
            "KernelDebugBuild": True,
            "KernelPrinting": True,
            "KernelVerificationBuild": False
        }
    ),
)


def tar_filter(tarinfo: TarInfo) -> TarInfo:
    """This is used to change the tarinfo when created the .tar.gz archive.

    This ensures the tar file does not leak information from the build environment.
    """
    # Force uid/gid
    tarinfo.uid = tarinfo.gid = 0
    tarinfo.uname = tarinfo.gname = "sel4cp"
    # This is unlikely to be set, but force it anyway
    tarinfo.pax_headers = {}
    tarinfo.mtime = SEL4CP_EPOCH
    assert tarinfo.isfile() or tarinfo.isdir()
    # Set the permissions properly
    if tarinfo.isdir():
        tarinfo.mode = tarinfo.mode & ~0o777 | 0o557
    if tarinfo.isfile():
        if "/bin/" in tarinfo.name:
            # Assume everything in bin should be executable.
            tarinfo.mode = tarinfo.mode & ~0o777 | 0o755
        else:
            tarinfo.mode = tarinfo.mode & ~0o777 | 0o644
    return tarinfo


def test_tool() -> None:
    r = system(
        "./env/bin/python -m unittest discover -s tool -v"
    )
    assert r == 0

def build_tool(tool_target: Path) -> None:
    r = system(
        "./env/bin/pyoxidizer build --release --path tool --target-triple x86_64-unknown-linux-musl"
    )
    assert r == 0

    tool_output = "./tool/build/x86_64-unknown-linux-musl/release/install/sel4cp"

    r = system(f"strip {tool_output}")
    assert r == 0

    copy(tool_output, tool_target)


def build_sel4(
    sel4_dir: Path,
    root_dir: Path,
    build_dir: Path,
    board: BoardInfo,
    config: ConfigInfo,
) -> None:
    """Build seL4"""
    build_dir = build_dir / board.name / config.name / "sel4"
    build_dir.mkdir(exist_ok=True, parents=True)

    sel4_install_dir = build_dir / "install"
    sel4_build_dir = build_dir / "build"

    sel4_install_dir.mkdir(exist_ok=True, parents=True)
    sel4_build_dir.mkdir(exist_ok=True, parents=True)

    print(f"Building sel4: {sel4_dir=} {root_dir=} {build_dir=} {board=} {config=}")

    config_args = list(board.kernel_options.items()) + list(config.kernel_options.items())
    config_strs = []
    for arg, val in sorted(config_args):
        if isinstance(val, bool):
            str_val = "ON" if val else "OFF"
        else:
            str_val = str(val)
        s = f"-D{arg}={str_val}"
        config_strs.append(s)
    config_str = " ".join(config_strs)

    platform = board.name
    cmd = (
        f"cmake -GNinja -DCMAKE_INSTALL_PREFIX={sel4_install_dir.absolute()} "\
        f" -DKernelPlatform={platform} {config_str} " \
        f"-S {sel4_dir.absolute()} -B {sel4_build_dir.absolute()}")

    r = system(cmd)
    if r != 0:
        raise Exception(f"Error configuring sel4: cmd={cmd}")

    cmd = f"cmake --build {sel4_build_dir.absolute()}"
    r = system(cmd)
    if r != 0:
        raise Exception(f"Error building sel4: cmd={cmd}")

    cmd = f"cmake --install {sel4_build_dir.absolute()}"
    r = system(cmd)
    if r != 0:
        raise Exception(f"Error installing sel4: cmd={cmd}")

    elf = sel4_install_dir / "bin" / "kernel.elf"
    dest = (
        root_dir / "board" / board.name / config.name / "elf" / "sel4.elf"
    )
    dest.unlink(missing_ok=True)
    copy(elf, dest)
    # Make output read-only
    dest.chmod(0o444)

    include_dir = root_dir / "board" / board.name / config.name / "include"
    for source in ("kernel_Config", "libsel4", "libsel4/sel4_Config", "libsel4/autoconf"):
        source_dir = sel4_install_dir / source / "include"
        for p in source_dir.rglob("*"):
            if not p.is_file():
                continue
            rel = p.relative_to(source_dir)
            dest = include_dir / rel
            dest.parent.mkdir(exist_ok=True, parents=True)
            dest.unlink(missing_ok=True)
            copy(p, dest)
            dest.chmod(0o444)


def build_elf_component(
    component_name: str,
    root_dir: Path,
    build_dir: Path,
    board: BoardInfo,
    config: ConfigInfo,
) -> None:
    """Build a specific ELF component.

    Right now this is either the loader or the monitor
    """
    sel4_dir = root_dir / "board" / board.name / config.name
    build_dir = build_dir / board.name / config.name / component_name
    build_dir.mkdir(exist_ok=True, parents=True)
    r = system(
        f"BUILD_DIR={build_dir.absolute()} GCC_CPU={board.gcc_cpu} SEL4_SDK={sel4_dir.absolute()} make  -C {component_name}"
    )
    if r != 0:
        raise Exception(
            f"Error building: {component_name} for board: {board.name} config: {config.name}"
        )
    elf = build_dir / f"{component_name}.elf"
    dest = (
        root_dir / "board" / board.name / config.name / "elf" / f"{component_name}.elf"
    )
    dest.unlink(missing_ok=True)
    copy(elf, dest)
    # Make output read-only
    dest.chmod(0o444)


def build_doc(root_dir):
    output = root_dir / "doc" / "sel4cp_user_manual.pdf"

    r = system(f'pandoc docs/manual.md -o {output}')
    assert r == 0


def build_lib_component(
    component_name: str,
    root_dir: Path,
    build_dir: Path,
    board: BoardInfo,
    config: ConfigInfo,
) -> None:
    """Build a specific library component.

    Right now this is just libsel4.a
    """
    sel4_dir = root_dir / "board" / board.name / config.name
    build_dir = build_dir / board.name / config.name / component_name
    build_dir.mkdir(exist_ok=True, parents=True)
    r = system(
        f"BUILD_DIR={build_dir.absolute()} GCC_CPU={board.gcc_cpu} SEL4_SDK={sel4_dir.absolute()} make -C {component_name}"
    )
    if r != 0:
        raise Exception(
            f"Error building: {component_name} for board: {board.name} config: {config.name}"
        )
    lib = build_dir / f"{component_name}.a"
    lib_dir = root_dir / "board" / board.name / config.name / "lib"
    dest = lib_dir / f"{component_name}.a"
    dest.unlink(missing_ok=True)
    copy(lib, dest)
    # Make output read-only
    dest.chmod(0o444)


    link_script = Path(component_name) / "sel4cp.ld"
    dest = lib_dir / "sel4cp.ld"
    dest.unlink(missing_ok=True)
    copy(link_script, dest)
    # Make output read-only
    dest.chmod(0o444)

    crt0 = build_dir / "crt0.o"
    dest = lib_dir / "crt0.o"
    dest.unlink(missing_ok=True)
    copy(crt0, dest)
    # Make output read-only
    dest.chmod(0o444)

    include_dir = root_dir / "board" / board.name / config.name / "include"
    source_dir = Path(component_name) / "include"
    for p in source_dir.rglob("*"):
        if not p.is_file():
            continue
        rel = p.relative_to(source_dir)
        dest = include_dir / rel
        dest.parent.mkdir(exist_ok=True, parents=True)
        dest.unlink(missing_ok=True)
        copy(p, dest)
        dest.chmod(0o444)


def main() -> None:
    parser = ArgumentParser()
    parser.add_argument("--sel4", type=Path, required=True)
    args = parser.parse_args()
    sel4_dir = args.sel4.expanduser()
    if not sel4_dir.exists():
        raise Exception(f"sel4_dir: {sel4_dir} does not exist")


    root_dir = Path("release") / f"{NAME}-sdk-{VERSION}"
    tar_file = Path("release") / f"{NAME}-sdk-{VERSION}.tar.gz"
    source_tar_file = Path("release") / f"{NAME}-source-{VERSION}.tar.gz"
    dir_structure = [
        root_dir / "doc",
        root_dir / "bin",
        root_dir / "board",
    ]
    for board in SUPPORTED_BOARDS:
        board_dir = root_dir / "board" / board.name
        dir_structure.append(board_dir)
        for config in SUPPORTED_CONFIGS:
            config_dir = board_dir / config.name
            dir_structure.append(config_dir)
            dir_structure += [
                config_dir / "include",
                config_dir / "lib",
                config_dir / "elf",
            ]

    for dr in dir_structure:
        dr.mkdir(exist_ok=True, parents=True)

    copy(Path("LICENSE"), root_dir)

    tool_target = root_dir / "bin" / "sel4cp"

    if not tool_target.exists():
        test_tool()
        build_tool(tool_target)

    build_doc(root_dir)

    build_dir = Path("build")
    for board in SUPPORTED_BOARDS:
        for config in SUPPORTED_CONFIGS:
            build_sel4(sel4_dir, root_dir, build_dir, board, config)
            build_elf_component("loader", root_dir, build_dir, board, config)
            build_elf_component("monitor", root_dir, build_dir, board, config)
            build_lib_component("libsel4cp", root_dir, build_dir, board, config)
        # Setup the examples
        for example, example_path in board.examples.items():
            include_dir = root_dir / "board" / board.name / "example" / example
            source_dir = example_path
            for p in source_dir.rglob("*"):
                if not p.is_file():
                    continue
                rel = p.relative_to(source_dir)
                dest = include_dir / rel
                dest.parent.mkdir(exist_ok=True, parents=True)
                dest.unlink(missing_ok=True)
                copy(p, dest)
                dest.chmod(0o444)

    # At this point we create a tar.gz file
    with tar_open(tar_file, "w:gz") as tar:
        tar.add(root_dir, arcname=root_dir.name, filter=tar_filter)

    # Build the source tar
    process = popen("git ls-files")
    filenames = [Path(fn.strip()) for fn in process.readlines()]
    process.close()
    source_prefix = Path(f"{NAME}-source-{VERSION}")
    with tar_open(source_tar_file, "w:gz") as tar:
        for filename in filenames:
            tar.add(filename, arcname=source_prefix / filename, filter=tar_filter)

if __name__ == "__main__":
    main()