BITS 64
CPU X64 

section .text
global _start

extern sterling_runtime_init;runtime setup
extern sterling_main;user entrypoint

_start:
    ;Clear RBP (Recommended by the ABI to mark the outermost frame)
    xor rbp, rbp

    ;Extract argc and argv from the stack
    ;[rsp] is argc, [rsp + 8] is argv[0] on 64bit
    pop rdi                 ; rdi = argc
    mov rsi, rsp            ; rsi = argv (pointer to the current top of stack)

    ;The System V ABI requires the stack to be 16-byte aligned before a 'call'.
    ;The kernel starts us aligned, but our 'pop' just moved rsp by 8 bytes.
    and rsp, -16

	call sterling_runtime_init ;elf loader hook for the exokernel ?

	;Call to the 'main' function
    ;Assuming signature like C: int sterling_main(int argc, char **argv)
	;May change it to reflect the object file implementation
    call sterling_main

    ; 5. Exit System Call
    ; sterling_main return its status in RAX. Move it to RDI for exit.
    mov rdi, rax            ; exit status
    mov rax, 60             ; sys_exit (60 for x86_64)
    syscall