tree cc1b020b37ea70639f00b5bd6b4635584dc70724
parent a74a3c111f37a884df0f00d179dd40ff081ff877
author Steven Rostedt <srostedt@redhat.com> 1318281864 -0400
committer Steven Rostedt <rostedt@goodmis.org> 1327701059 -0500

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>