; hello.asm - Hello World with debug symbols for NASM
BITS 64                         ; Explicitly specify 64-bit mode
DEFAULT REL                     ; Use RIP-relative addressing by default

; Data section
section .data
    message db "Hello, World!", 13, 10, 0  ; String with CRLF and null terminator
    message_len equ $ - message            ; Calculate string length

; Code section
section .text
global main                    ; Export main symbol for linker

extern ExitProcess            ; Import Windows API functions
extern GetStdHandle
extern WriteConsoleA

main:
    ; Function prologue
    push    rbp
    mov     rbp, rsp
    sub     rsp, 32              ; Shadow space for Windows API calls

    ; Get stdout handle
    mov     ecx, -11            ; STD_OUTPUT_HANDLE
    call    GetStdHandle
    mov     rbx, rax            ; Save handle for WriteConsole

    ; Write message
    mov     rcx, rbx            ; Console handle
    lea     rdx, [message]      ; Message buffer
    mov     r8d, message_len    ; Message length
    lea     r9, [rsp+28]        ; Written chars (unused)
    mov     qword [rsp+20], 0   ; Reserved (must be 0)
    call    WriteConsoleA

    ; Exit program
    xor     ecx, ecx            ; Exit code 0
    call    ExitProcess

    ; Function epilogue (not reached due to ExitProcess)
    leave
    ret