nasm-tutorial references Linux syscall tables Flags NASM official docs NASM tutorial REcommended tools for practice pwndbg compile nasm -f elf64 hello.asm -o hello.o ld hello.o -o hello ./hello compile C and assembly with gcc nasm -f elf64 hello.asm -o hello.o gcc -no-pie -nostdlib say.c -c ld say.o hello.o -o say clean mess git clean -xdf