; bootstrap.asm — _start: parse argc/argv/envp, call main, exit
; OBSERVED: ELF64 entry point, System V AMD64 ABI stack layout

%include "include/syscall.inc"

section .text
global _start
extern main

_start:
    ; On entry: rsp -> argc, rsp+8 -> argv[0], ...
    pop rdi          ; argc
    mov rsi, rsp     ; argv
    lea rdx, [rsp + rdi*8 + 8]  ; envp

    ; Align stack to 16 bytes before call
    and rsp, ~0xF
    sub rsp, 8

    call main

    ; exit(rax)
    mov rdi, rax
    mov rax, SYS_EXIT_GROUP
    syscall