Pascal Cuoq pascal-cuoq

GSBASE and FSBASE

When you're running out of registers while writing a JIT, you might resort to more unconventional methods for memory access. You might choose to resort to segment registers if you need a fixed register for memory offsets.

Instructions such as:

lea    rax,gs:[rcx+rdx*8]
mov    rax,gs:[rcx+rdx*8]

would then be available for your use.

	You must not sleep
	Arnulf Øverland, 1937


	I woke up one night from a strange dream,
	it was like a voice spoke to me,
	far away like an underground current -
	and I sat up: What do you want with me?

	- You must not sleep! You must not sleep!