refactor: implement generated ABI

Cargo.toml

@@ -10,6 +10,8 @@ authors = ["Mark Poliakov <mark@alnyan.me>"]
 opt-level = 3
 
 [dependencies]
+abi-lib = { git = "https://git.alnyan.me/yggdrasil/abi-generator.git" }
+
 yggdrasil-abi = { git = "https://git.alnyan.me/yggdrasil/yggdrasil-abi.git" }
 vfs = { path = "lib/vfs" }
 device-api = { path = "lib/device-api", features = ["derive"] }
@@ -70,6 +72,11 @@ acpi-system = { git = "https://github.com/alnyan/acpi-system.git" }
 ygg_driver_nvme = { path = "driver/block/nvme" }
 kernel-arch-x86_64 = { path = "arch/x86_64" }
 
+[build-dependencies]
+prettyplease = "0.2.15"
+yggdrasil-abi-def = { git = "https://git.alnyan.me/yggdrasil/yggdrasil-abi-def.git" }
+abi-generator = { git = "https://git.alnyan.me/yggdrasil/abi-generator.git" }
+
 [features]
 default = ["fb_console"]
 fb_console = []

build.rs

@@ -1,10 +1,16 @@
 use std::{
-    env,
+    env, fs,
     io::{self, Write},
-    path::PathBuf,
+    path::{Path, PathBuf},
     process::Command,
 };
 
+use abi_generator::{
+    abi::{ty::TypeWidth, AbiBuilder},
+    syntax::UnwrapFancy,
+    TargetEnv,
+};
+
 fn build_x86_64() {
     const DEFAULT_8086_AS: &str = "nasm";
     const AP_BOOTSTRAP_S: &str = "src/arch/x86_64/boot/ap_boot.S";
@@ -33,9 +39,31 @@ fn build_x86_64() {
     }
 }
 
+fn generate_syscall_dispatcher<P: AsRef<Path>>(out_dir: P) {
+    let abi: AbiBuilder = AbiBuilder::from_string(
+        yggdrasil_abi_def::ABI_FILE,
+        TargetEnv {
+            thin_pointer_width: TypeWidth::U64,
+            fat_pointer_width: TypeWidth::U128,
+        },
+    )
+    .unwrap_fancy("");
+
+    let generated_dispatcher = out_dir.as_ref().join("generated_dispatcher.rs");
+    let file = prettyplease::unparse(
+        &abi.emit_syscall_dispatcher("handle_syscall", "impls")
+            .unwrap_fancy(""),
+    );
+
+    fs::write(generated_dispatcher, file.as_bytes()).unwrap();
+}
+
 fn main() {
+    let out_dir = env::var("OUT_DIR").unwrap();
     let arch = env::var("CARGO_CFG_TARGET_ARCH").unwrap();
 
+    generate_syscall_dispatcher(&out_dir);
+
     println!("cargo:rerun-if-changed=build.rs");
 
     match arch.as_str() {

driver/fs/memfs/src/lib.rs

@@ -148,8 +148,8 @@ impl<A: BlockAllocator> MemoryFilesystem<A> {
             let node = self.make_path(&root, path, FileType::Directory, false)?;
             assert_eq!(node.ty(), hdr.node_kind());
 
-            let uid = UserId::from(usize::from(&hdr.uid) as u32);
-            let gid = GroupId::from(usize::from(&hdr.gid) as u32);
+            let uid = unsafe { UserId::from_raw(usize::from(&hdr.uid) as u32) };
+            let gid = unsafe { GroupId::from_raw(usize::from(&hdr.gid) as u32) };
             let mode = convert_mode(usize::from(&hdr.mode))?;
 
             let access = unsafe { AccessToken::authorized() };

libk/libk-thread/Cargo.toml

@@ -10,6 +10,7 @@ libk-util = { path = "../libk-util" }
 libk-mm = { path = "../libk-mm" }
 libk-device = { path = "../libk-device" }
 kernel-arch = { path = "../../arch" }
+abi-lib = { git = "https://git.alnyan.me/yggdrasil/abi-generator.git" }
 
 yggdrasil-abi = { git = "https://git.alnyan.me/yggdrasil/yggdrasil-abi.git" }
 

libk/libk-thread/src/process.rs

@@ -1,5 +1,6 @@
 use core::marker::PhantomData;
 
+use abi_lib::SyscallRegister;
 use alloc::{
     collections::BTreeMap,
     string::String,
@@ -17,7 +18,7 @@ use libk_util::{
     },
 };
 use yggdrasil_abi::{
-    error::{Error, SyscallResult},
+    error::Error,
     process::{ExitCode, Signal, ThreadSpawnOptions},
 };
 
@@ -247,12 +248,12 @@ impl<PM: ProcessManager<Process = Self>, IO: ProcessIo> ProcessImpl<PM, IO> {
         let src_thread = Thread::current();
         let src_process = src_thread.process::<PM>();
 
-        let rax = src_process
+        let value = src_process
             .fork_inner(frame)
             .map(|ProcessId(p)| p as u32)
-            .into_syscall_result();
+            .into_syscall_register();
 
-        frame.set_return_value(rax as _);
+        frame.set_return_value(value as _);
     }
 
     /// Replaces the process address space with a new one, loaded from the specified program

src/arch/aarch64/exception.rs

@@ -11,7 +11,7 @@ use aarch64_cpu::{
 };
 use abi::{
     process::{Signal, SignalEntryData},
-    syscall::SyscallFunction,
+    SyscallFunction,
 };
 use kernel_arch::{task::TaskFrame, Architecture, ArchitectureImpl};
 use kernel_arch_aarch64::context::ExceptionFrame;

src/arch/aarch64/mod.rs

@@ -93,6 +93,7 @@ impl Platform for AArch64 {
     }
 
     unsafe fn reset(&self) -> ! {
+        loop {}
         if let Some(reset) = self.reset.try_get() {
             reset.reset()
         } else {

src/arch/x86_64/syscall.rs

@@ -2,7 +2,7 @@
 
 use core::arch::global_asm;
 
-use abi::{process::SignalEntryData, syscall::SyscallFunction};
+use abi::{process::SignalEntryData, SyscallFunction};
 use kernel_arch::task::TaskFrame;
 use kernel_arch_x86_64::{
     context::SyscallFrame,
@@ -23,6 +23,7 @@ fn syscall_inner(frame: &mut SyscallFrame) {
             return;
         }
     }
+    // FIXME: Fork is temporarily disabled
     if frame.rax == usize::from(SyscallFunction::Fork) as u64 {
         unsafe {
             ProcessImpl::raw_fork(frame);

src/main.rs

@@ -25,7 +25,8 @@
     inline_const,
     maybe_uninit_uninit_array,
     const_maybe_uninit_uninit_array,
-    never_type
+    never_type,
+    trace_macros
 )]
 #![allow(
     clippy::new_without_default,

src/syscall/arg.rs

@@ -1,26 +1,19 @@
-use abi::io::RawFd;
-use libk_thread::{
-    mem::{validate_user_region, ForeignPointer},
-    thread::Thread,
-};
+use libk_thread::{mem::ForeignPointer, thread::Thread};
 use yggdrasil_abi::error::Error;
 
-// XXX
-
-pub(super) fn arg_buffer_ref<'a>(base: usize, len: usize) -> Result<&'a [u8], Error> {
+pub(super) fn ref_const<'a, T: Sized>(addr: usize) -> Result<&'a T, Error> {
     let proc = Thread::current();
-    validate_user_region(proc.address_space(), base, len, false)?;
-    Ok(unsafe { core::slice::from_raw_parts(base as *const u8, len) })
+    let ptr = addr as *const T;
+    unsafe { ptr.validate_user_ptr(proc.address_space()) }
+}
+pub(super) fn ref_mut<'a, T: Sized>(addr: usize) -> Result<&'a mut T, Error> {
+    let proc = Thread::current();
+    let ptr = addr as *mut T;
+    unsafe { ptr.validate_user_mut(proc.address_space()) }
 }
 
-pub(super) fn arg_buffer_mut<'a>(base: usize, len: usize) -> Result<&'a mut [u8], Error> {
-    let proc = Thread::current();
-    validate_user_region(proc.address_space(), base, len, true)?;
-    Ok(unsafe { core::slice::from_raw_parts_mut(base as *mut u8, len) })
-}
-
-pub(super) fn arg_user_str<'a>(base: usize, len: usize) -> Result<&'a str, Error> {
-    let slice = arg_buffer_ref(base, len)?;
+pub(super) fn str_ref<'a>(base: usize, len: usize) -> Result<&'a str, Error> {
+    let slice = slice_ref(base, len)?;
     if slice.contains(&0) {
         warnln!("User-supplied string contains NUL characters");
         return Err(Error::InvalidArgument);
@@ -28,31 +21,13 @@ pub(super) fn arg_user_str<'a>(base: usize, len: usize) -> Result<&'a str, Error
     Ok(core::str::from_utf8(slice).unwrap())
 }
 
-pub(super) fn arg_user_ref<'a, T: Sized>(addr: usize) -> Result<&'a T, Error> {
+pub(super) fn slice_ref<'a, T: Sized>(base: usize, count: usize) -> Result<&'a [T], Error> {
     let proc = Thread::current();
-    let ptr = addr as *const T;
-    unsafe { ptr.validate_user_ptr(proc.address_space()) }
+    let ptr = base as *const T;
+    unsafe { ptr.validate_user_slice(count, proc.address_space()) }
 }
-
-pub(super) fn arg_user_mut<'a, T: Sized>(addr: usize) -> Result<&'a mut T, Error> {
-    let proc = Thread::current();
-    let ptr = addr as *mut T;
-    unsafe { ptr.validate_user_mut(proc.address_space()) }
-}
-
-pub(super) fn arg_user_slice_mut<'a, T: Sized>(
-    base: usize,
-    count: usize,
-) -> Result<&'a mut [T], Error> {
+pub(super) fn slice_mut<'a, T: Sized>(base: usize, count: usize) -> Result<&'a mut [T], Error> {
     let proc = Thread::current();
     let ptr = base as *mut T;
     unsafe { ptr.validate_user_slice_mut(count, proc.address_space()) }
 }
-
-pub(super) fn arg_option_fd(raw: u32) -> Option<RawFd> {
-    if raw == u32::MAX {
-        None
-    } else {
-        Some(RawFd(raw))
-    }
-}