Others have described how branching works. But I'm not convinced it's possible to loop around to the beginning using only MOV instructions. movfuscator as curre

Others have described how branching works. But I'm not convinced it's possible to loop around to the beginning using only MOV instructions. movfuscator as currently implemented performs a CALL at the beginning to set up a signal handler, under the justification that it's not part of the real program and could be done with only MOVs, if the program were running in ring 0. (Even if you got rid of libc, it would still take an INT 0x80, SYSENTER, or SYSCALL to pass control to the kernel.) However, it seems to me like if you booted the processor directly into the program instead of having a bootloader and kernel to help you, then you'd run into a brick wall trying to move from 16-bit real mode to 32-bit protected mode, since doing so requires setting up a global descriptor table (GDT), and the only way I know of to do that is with the LGDT instruction. Unless I'm forgetting something?