Add signal support - exit on signal

libstd/libc/src/start.rs

@@ -0,0 +1,40 @@
+use super::exit;
+
+#[no_mangle]
+#[naked]
+#[cfg(target_arch = "x86")]
+pub unsafe fn _start() {
+    asm!("push esp
+        call _start_stack
+        pop esp"
+        :
+        :
+        : "memory"
+        : "intel", "volatile");
+    let _ = exit(0);
+}
+
+#[no_mangle]
+#[naked]
+#[cfg(target_arch = "x86_64")]
+pub unsafe fn _start() {
+    asm!("mov rdi, rsp
+        and rsp, 0xFFFFFFFFFFFFFFF0
+        call _start_stack"
+        :
+        :
+        : "memory"
+        : "intel", "volatile");
+    let _ = exit(0);
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn _start_stack(stack: *const usize){
+    extern "C" {
+        fn main(argc: usize, argv: *const *const u8) -> usize;
+    }
+
+    let argc = *stack as usize;
+    let argv = stack.offset(1) as *const *const u8;
+    let _ = exit(main(argc, argv));
+}