From 23b02b7284122c24d86130df6dd4c5a150c94c48 Mon Sep 17 00:00:00 2001 From: Erin Date: Thu, 30 Mar 2023 23:06:59 +0200 Subject: [PATCH] somehow syscalls --- Cargo.lock | 39 ++++++++++++++++++++++++++++++++++- kernel/Cargo.toml | 12 ++++++----- kernel/src/arch/x86_64/gdt.rs | 31 +++++++++++++++++++++------- kernel/src/kmain.rs | 4 ++-- kernel/src/lib.rs | 6 +----- kernel/src/ubloader.rs | 0 6 files changed, 72 insertions(+), 20 deletions(-) create mode 100644 kernel/src/ubloader.rs diff --git a/Cargo.lock b/Cargo.lock index be2b611..bf63848 100644 --- a/Cargo.lock +++ b/Cargo.lock @@ -190,6 +190,17 @@ dependencies = [ "syn", ] +[[package]] +name = "elfloader" +version = "0.16.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "6a7b18d35bf8ec3bac59c3ec29cf1f1b46e764e00b42a9c0c754d06e38e78f3b" +dependencies = [ + "bitflags", + "log", + "xmas-elf", +] + [[package]] name = "env_logger" version = "0.10.0" @@ -235,6 +246,15 @@ dependencies = [ "rustc_version", ] +[[package]] +name = "error-stack" +version = "0.3.1" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "5f00447f331c7f726db5b8532ebc9163519eed03c6d7c8b73c90b3ff5646ac85" +dependencies = [ + "rustc_version", +] + [[package]] name = "fatfs" version = "0.3.6" @@ -338,6 +358,8 @@ version = "0.2.0" dependencies = [ "crossbeam-queue", "derive_more", + "elfloader", + "error-stack 0.3.1", "limine", "log", "sbi", @@ -489,7 +511,7 @@ name = "repbuild" version = "0.2.0" dependencies = [ "env_logger", - "error-stack", + "error-stack 0.2.4", "fatfs", "log", ] @@ -835,3 +857,18 @@ dependencies = [ "rustversion", "volatile", ] + +[[package]] +name = "xmas-elf" +version = "0.8.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "8d29b4d8e7beaceb4e77447ba941a7600d23d0319ab52da0461abea214832d5a" +dependencies = [ + "zero", +] + +[[package]] +name = "zero" +version = "0.1.3" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "2fe21bcc34ca7fe6dd56cc2cb1261ea59d6b93620215aefb5ea6032265527784" diff --git a/kernel/Cargo.toml b/kernel/Cargo.toml index 52f0593..ce03c06 100644 --- a/kernel/Cargo.toml +++ b/kernel/Cargo.toml @@ -4,11 +4,13 @@ name = "kernel" version = "0.2.0" [dependencies] -slab = { version = "0.4", default-features = false } -spin = "0.9" -versioning = { git = "https://git.ablecorp.us/able/aos_userland" } -log = "0.4" -uart_16550 = "0.2" +elfloader = "0.16" +error-stack = { version = "0.3", default-features = false} +log = "0.4" +spin = "0.9" +uart_16550 = "0.2" +slab = { version = "0.4", default-features = false } +versioning = { git = "https://git.ablecorp.us/able/aos_userland" } [dependencies.crossbeam-queue] version = "0.3" diff --git a/kernel/src/arch/x86_64/gdt.rs b/kernel/src/arch/x86_64/gdt.rs index f5b6d1f..c6aa677 100644 --- a/kernel/src/arch/x86_64/gdt.rs +++ b/kernel/src/arch/x86_64/gdt.rs @@ -15,13 +15,12 @@ pub unsafe fn init() { log::info!("Initialising GDT"); GDT.0.load(); - unsafe { - CS::set_reg(GDT.1.kcode); - DS::set_reg(GDT.1.kdata); - ES::set_reg(GDT.1.kdata); - SS::set_reg(GDT.1.kdata); - load_tss(GDT.1.tss); - } + CS::set_reg(GDT.1.kcode); + DS::set_reg(GDT.1.kdata); + ES::set_reg(GDT.1.kdata); + SS::set_reg(GDT.1.kdata); + load_tss(GDT.1.tss); + init_syscalls(&GDT.1); } struct Selectors { @@ -57,3 +56,21 @@ static GDT: Lazy<(GlobalDescriptorTable, Selectors)> = Lazy::new(|| { }; (gdt, sels) }); + +/// Initialize syscalls +unsafe fn init_syscalls(sls: &Selectors) { + use x86_64::registers::{ + model_specific::{Efer, EferFlags, LStar, SFMask, Star}, + rflags::RFlags, + }; + + Star::write(sls.ucode, sls.udata, sls.kcode, sls.kdata); + SFMask::write(RFlags::from_bits(0x200).expect("Invalid RFlags for SFMask")); + LStar::write(VirtAddr::from_ptr(handle_syscall as *const ())); + Efer::update(|x| *x |= EferFlags::SYSTEM_CALL_EXTENSIONS); +} + +extern "C" fn handle_syscall(a: u64) -> ! { + log::info!("called syscall {a}"); + todo!("Return from syscall"); +} diff --git a/kernel/src/kmain.rs b/kernel/src/kmain.rs index 9d562f9..79f1392 100644 --- a/kernel/src/kmain.rs +++ b/kernel/src/kmain.rs @@ -1,6 +1,6 @@ //! AbleOS Kernel Entrypoint -pub fn kmain(cmdline: &str, initrd: Option<&'static [u8]>) -> ! { +pub fn kmain(cmdline: &str, bootstrap: Option<&'static [u8]>) -> ! { log::debug!("Entered kmain"); // TODO: Actual cmdline parsing (Serde?) @@ -9,7 +9,7 @@ pub fn kmain(cmdline: &str, initrd: Option<&'static [u8]>) -> ! { } log::info!("Cmdline: \"{cmdline}\""); - let initrd = initrd.expect("no initrd found"); + let bootstrap = bootstrap.expect("no bootstrap found"); crate::arch::sloop() } diff --git a/kernel/src/lib.rs b/kernel/src/lib.rs index 9fa076b..798d096 100644 --- a/kernel/src/lib.rs +++ b/kernel/src/lib.rs @@ -19,6 +19,7 @@ mod kmain; mod logger; mod memory; mod task; +mod ubloader; use versioning::Version; @@ -31,11 +32,6 @@ pub const VERSION: Version = Version { #[panic_handler] fn panic(info: &core::panic::PanicInfo) -> ! { - // TODO: Better panic handler - // let _ = crate::arch::log(format_args!( - // "\r\n\x1b[1m\x1b[4m\x1b[38;5;125mKernel Panic\x1b[0m\r\n", - // )); - if let Some(loc) = info.location() { let _ = crate::arch::log(format_args!( "Location: {}: {}, {}\r\n", diff --git a/kernel/src/ubloader.rs b/kernel/src/ubloader.rs new file mode 100644 index 0000000..e69de29