Konstantin Belousov
8671e823b7
With FRED, SYSCALL is delivered as event type syscall (7) and vector 1.
SYSENTER is syscall with vector 2. Handle SYSENTER in slow path,
otherwise 32bit code is able to execute 64bit syscalls.
Also check that SYSCALL comes from the 64bit mode. Intel already
specifies that SYSCALL causes #UD in compatibility mode, but there is no
AMD specification for SYSCALL under FRED yet, and SYSCALL is allowed
in compatibility mode on AMD with IDT event delivery.
Fixes: 6e93f5e4d6 ("amd64: FRED support")
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
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|---|---|
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