Kernel V3.0.0

src/kernel/userland/crt0.asm

@@ -0,0 +1,26 @@
+; userland/crt0.asm
+global _start
+extern main
+extern sys_exit
+
+section .text
+_start:
+    ; The kernel loads the ELF and jumps here.
+    ; RSP should point to the 0x800000 stack.
+
+    ; Align the stack to 16 bytes for C functions (System V ABI)
+    and rsp, -16
+
+    ; Call main(argc, argv)
+    ; We don't have argc or argv yet, pass 0
+    xor rdi, rdi
+    xor rsi, rsi
+    call main
+
+    ; If main returns, call exit(status)
+    mov rdi, rax ; Pass main's return value to exit syscall
+    call sys_exit
+
+    ; Fallback halt if exit miraculously returns
+.hang:
+    jmp .hang