43 lines
1.3 KiB
NASM
43 lines
1.3 KiB
NASM
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; hello.asm - Hello World with debug symbols for NASM
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BITS 64 ; Explicitly specify 64-bit mode
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DEFAULT REL ; Use RIP-relative addressing by default
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; Data section
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section .data
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message db "Hello, World!", 13, 10, 0 ; String with CRLF and null terminator
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message_len equ $ - message ; Calculate string length
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; Code section
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section .text
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global main ; Export main symbol for linker
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extern ExitProcess ; Import Windows API functions
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extern GetStdHandle
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extern WriteConsoleA
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main:
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; Function prologue
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push rbp
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mov rbp, rsp
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sub rsp, 32 ; Shadow space for Windows API calls
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; Get stdout handle
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mov ecx, -11 ; STD_OUTPUT_HANDLE
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call GetStdHandle
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mov rbx, rax ; Save handle for WriteConsole
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; Write message
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mov rcx, rbx ; Console handle
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lea rdx, [message] ; Message buffer
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mov r8d, message_len ; Message length
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lea r9, [rsp+28] ; Written chars (unused)
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mov qword [rsp+20], 0 ; Reserved (must be 0)
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call WriteConsoleA
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; Exit program
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xor ecx, ecx ; Exit code 0
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call ExitProcess
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; Function epilogue (not reached due to ExitProcess)
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leave
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ret
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