feat: DLL, console

Cargo.toml

@@ -8,7 +8,11 @@ edition = "2018"
 
 [[example]]
 name = "hwa"
-path = "example/hwa.rs"
+path = "examples/hwa.rs"
+
+[[example]]
+name = "con"
+path = "examples/con.rs"
 
 [profile.release]
 opt-level = "z"

Makefile.toml

@@ -15,7 +15,7 @@ args = ["clean"]
 command = "cargo"
 args = ["build", "@@remove-empty(RELEASE_FLAG)"]
 
-[tasks.hwa]
+[tasks.example]
 command = "cargo"
-args = ["objcopy", "@@remove-empty(RELEASE_FLAG)", "--example", "hwa", "--", "-O", "binary", "--strip-all", "rust.kex"]
+args = ["objcopy", "@@remove-empty(RELEASE_FLAG)", "--example", "${@}", "--", "-O", "binary", "--strip-all", "${@}.kex"]
 #install_crate = { crate_name = "cargo-binutils", binary = "rust-objcopy", test_arg = ["--help"] }

examples/con.rs

@@ -0,0 +1,20 @@
+#![no_std]
+#![no_main]
+
+use cstr_core::cstr;
+use kos::{dll::Console, threads::exit};
+
+extern crate alloc;
+
+#[no_mangle]
+pub fn kol_main() {
+    let header = cstr!("Rust!");
+    let string = "Hi from Rust!";
+
+    let con_lib = Console::import(None).unwrap();
+    con_lib.init(u32::MAX, u32::MAX, u32::MAX, u32::MAX, header);
+    con_lib.write_string(string);
+    con_lib.exit(false);
+
+    exit();
+}

link.x

@@ -1,6 +1,6 @@
 PATH_SIZE   = 1024;
 PARAMS_SIZE =  256;
-STACK_SIZE  = 1024*4;
+STACK_SIZE  = 1024*64;
 
 SECTIONS {
   hdr : {

src/dll.rs

@@ -0,0 +1,46 @@
+use crate::sys;
+use cstr_core::CStr;
+
+mod console;
+pub use console::Console;
+
+pub struct DLL {
+    table: *const ImportTableEl,
+}
+
+impl DLL {
+    pub fn load_dll(name: &CStr) -> Result<DLL, &str> {
+        unsafe {
+            let table = sys::load_dll(name.as_ptr() as *const u8);
+            if table as usize == 0 {
+                return Err("Library load error");
+            }
+
+            return Ok(DLL {
+                table: table as *const ImportTableEl,
+            });
+        }
+    }
+
+    pub fn get_func(&self, name: &CStr) -> Result<*const (), &str> {
+        unsafe {
+            let mut i = 0;
+            loop {
+                let el = self.table.add(i);
+                if el as usize == 0 {
+                    return Err("Function not found");
+                }
+                let cur_name = CStr::from_ptr((*el).func_name as *const i8);
+                if cur_name == name {
+                    return Ok((*el).func_addr as *const ());
+                }
+                i += 1;
+            }
+        }
+    }
+}
+#[repr(C)] // Avoid random field order
+struct ImportTableEl {
+    pub func_name: *const u8,
+    pub func_addr: fn(),
+}

src/dll/console.rs

@@ -0,0 +1,40 @@
+use crate::dll::DLL;
+use core::mem::transmute;
+use cstr_core::cstr;
+use cstr_core::CStr;
+
+pub struct Console {
+    con_init: extern "stdcall" fn(u32, u32, u32, u32, *const u8),
+    con_write_string: extern "stdcall" fn(*const u8, u32),
+    con_exit: extern "stdcall" fn(bool),
+}
+
+impl Console {
+    pub fn import(path: Option<&CStr>) -> Result<Self, &str> {
+        let lib = DLL::load_dll(path.unwrap_or(cstr!("/sys/lib/console.obj")));
+        match lib {
+            Err(e) => return Err(e),
+            Ok(dll) => unsafe {
+                Ok(Console {
+                    con_init: transmute(dll.get_func(cstr!("con_init")).ok().unwrap()),
+                    con_write_string: transmute(
+                        dll.get_func(cstr!("con_write_string")).ok().unwrap(),
+                    ),
+                    con_exit: transmute(dll.get_func(cstr!("con_exit")).ok().unwrap()),
+                })
+            },
+        }
+    }
+
+    pub fn init(&self, x: u32, y: u32, width: u32, height: u32, title: &CStr) {
+        (self.con_init)(x, y, width, height, title.as_ptr() as *const u8);
+    }
+
+    pub fn write_string(&self, text: &str) {
+        (self.con_write_string)(text.as_ptr(), text.len() as u32);
+    }
+
+    pub fn exit(self, close_window: bool) {
+        (self.con_exit)(close_window);
+    }
+}

src/func_constants.inc

@@ -18,3 +18,4 @@ SF_SYS_MISC             = 68
     SSF_HEAP_INIT   = 11
     SSF_MEM_ALLOC   = 12
     SSF_MEM_FREE    = 13
+    SSF_LOAD_DLL    = 19

src/lib.rs

@@ -2,9 +2,11 @@
 
 mod modules;
 mod nanolibc;
-pub mod sys;
 
 pub mod allocation;
+pub mod dll;
+pub mod sys;
+
 pub use modules::*;
 
 #[macro_use]
@@ -26,6 +28,8 @@ macro_rules! throw_new {
 macro_rules! panic {
     ($text:expr) => {
         debug_write(cstr_core::cstr!("Panic!\n" + $text + "\n"));
-        sys::exit();
+        unsafe {
+            sys::exit();
+        }
     };
 }

src/sys.rs

@@ -55,4 +55,8 @@ extern "C" {
     // 68.13
     #[link_name = "_free"]
     pub fn free(block: *const u8) -> bool;
+
+    // 68.19
+    #[link_name = "_load_dll"]
+    pub fn load_dll(name: *const u8) -> *const u32;
 }

src/syscalls.S

@@ -17,6 +17,7 @@ section '.text'
     public _alloc
     public _free
     public _get_lang
+    public _load_dll
 
 _exit:
     mov eax, SF_TERMINATE_PROCESS
@@ -118,3 +119,9 @@ _get_lang:
     int 0x40
     ret
 
+_load_dll:
+    mov eax, SF_SYS_MISC
+    mov ebx, SSF_LOAD_DLL
+    mov ecx, [esp + 4 * 1]
+    int 0x40
+    ret