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jprobe_return seems to have aged badly. Comments referring to
non-existent behaviours, and a dangerous habit of messing
with registers without telling the compiler.
This patches applies the following remedies:
- Fix the comments to describe the actual behaviour
- Tidy up the asm sequence to directly assign the
stack pointer without clobbering extra registers
- Mark the rest of the function as unreachable() so
that the compiler knows that there is no need for
an epilogue
- Stop making jprobe_return_break a global function
(you really don't want to call that guy, and it isn't
even a function).
Tested with tcp_probe.
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
3b7d14e9f3