relocating them. The text is allocated as RWX, and then mprotected to RW.
There is a bug that prevents us from doing RW->RX on amd64 and perhaps
sparc64. On x86, the pmap waits for the page to fault before granting it
the X permission. But in the trap handler, such a page is considered as
belonging to kernel_map, while it actually belongs to module_map. The
kernel then finds out the page is not present in kernel_map, and panics.
In all cases, module_map is non pageable, so even if the trap were handled
properly, it still wouldn't work.
Therefore, there is a small window in which the segment is RWX. But that's
fine enough, for now.
d2c6c6c84f