implement an api for errors

libraries/std/src/entry.rs

@@ -1,4 +1,4 @@
-use core::arch::asm;
+use crate::{exit::exit, Error};
 
 #[no_mangle]
 unsafe extern "C" fn _start() -> ! {
@@ -8,14 +8,24 @@ unsafe extern "C" fn _start() -> ! {
 
     // TODO: grab and pass arguments to main
 
-    main(0, core::ptr::null());
+    let ret = main(0, core::ptr::null());
 
-    // asm!(
-    //     "syscall",
-    //     in("rax") 60,
-    //     in("rdi") 0,
-    //     options(noreturn)
-    // );
+    // TODO: implement exiting properly and provide a public exit function
+    let err_obj = match ret {
+        0 => None,
+        1 => {
+            // TODO: Get errorID location and error message
+
+            Some(Error {
+                error_id: 123456789,
+                location: None,
+                a_lil_message_as_a_treat: "Unknown Cause",
+            })
+        }
+        _ => panic!("Program returned an invalid isize"),
+    };
+
+    exit(err_obj);
 }
 
 #[lang = "start"]

libraries/std/src/exit.rs

@@ -0,0 +1,4 @@
+use crate::Error;
+
+/// Exit a program
+pub fn exit(error_code: Option<Error>) -> ! {}

libraries/std/src/lib.rs

@@ -4,10 +4,11 @@
 
 mod entry;
 pub mod env;
+pub mod exit;
 pub mod io;
 pub mod panic;
 
-use core::arch::asm;
+use core::{arch::asm, fmt::Display};
 
 #[prelude_import]
 pub use prelude::rust_2021::*;
@@ -49,3 +50,29 @@ pub fn print_char(c: char) {
         );
     }
 }
+#[derive(Debug)]
+pub struct LocationInFile<'a> {
+    // TODO: replace &str with ableOS path
+    file_path: &'a str,
+
+    line: u16,
+    column: u16,
+}
+impl<'a> Display for Error<'a> {
+    fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
+        write!(f, "{}{}{}", self.file_path, self.line, self.column)
+    }
+}
+
+pub struct Error<'a> {
+    error_id: u128,
+    // Optional location of the error
+    location: Option<LocationInFile<'a>>,
+    a_lil_message_as_a_treat: &'a str,
+}
+
+impl<'a> Display for Error<'a> {
+    fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
+        write!(f, "EID: {}\nSRC: {}", self.error_id, self.location)
+    }
+}

libraries/std/src/panic.rs

@@ -4,15 +4,5 @@ use core::arch::asm;
 fn panic_handler(pinfo: &core::panic::PanicInfo) -> ! {
     print("PANIC!\n");
 
-    // #[cfg(unix)]
-    unsafe {
-        asm!(
-            "syscall",
-            in("rax") 231,
-            in("rdi") 1,
-            options(noreturn)
-        );
-    }
-
     loop {}
 }