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I don't think you can access 64bit registers from 32bit code. I know you could access EAX (32bit registers) from 16bit code with a prefix (0x66), but I do not t
by 0x0 11y ago
I don't think you can access 64bit registers from 32bit code. I know you could access EAX (32bit registers) from 16bit code with a prefix (0x66), but I do not think there's an equivalent access to RAX for the 32<->64bit case.
- JoeAltmaier 11y agoAh right - those prefixes in 32-bit mode are inc/dec register operations. They only exist in 64-bit mode (where reg inc/dec is done with other instructions).