jump labels: Add infrastructure to update jump labels at compile time
Add the infrastructure to allow architectures to modify the jump label
locations at compile time. This is mainly for x86, where the jmps may
be either 2 bytes or 5 bytes. Instead of wasting 5 bytes for all jump labels,
this code will let x86 put in a jmp instead of a 5 byte nop. Then the
assembler will make either a 2 byte or 5 byte jmp depending on where
the target is.
At compile time, this code will replace the jmps with either a 2 byte
or 5 byte nop depending on the size of the jmp that was added.
Cc: Jason Baron <jbaron@redhat.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
6 files changed
