Unironically the NASM docs are AMAZING for this, and by far the best. https://www.nasm.us/xdoc/2.15.05/html/nasmdoc0.html https://www.nasm.us/xdoc/2.15.05/html/

Unironically the NASM docs are AMAZING for this, and by far the best. https://www.nasm.us/xdoc/2.15.05/html/nasmdoc0.html https://www.nasm.us/xdoc/2.15.05/html/nasmdoc0.html . For example for 64bit windows https://www.nasm.us/xdoc/2.15.05/html/nasmdo12.html#section-12.4 https://www.nasm.us/xdoc/2.15.05/html/nasmdo12.html#section-... . There's also this for formats, this is windows for example. https://www.nasm.us/xdoc/2.15.05/html/nasmdoc8.html#section-8.6 https://www.nasm.us/xdoc/2.15.05/html/nasmdoc8.html#section-... For general systems programming/asm, AMD has REALLY well written documentation. Intel is better for edge cases and are more explicit. But when learning the explicitness makes it more complicated and AMD reads on the level of a regular person, not some 80 year old greybeard who writes asm in hex codes.