Re: [PATCH] arm: Add unwinding annotations for 64bit divisionfunctions

[Jon Medhurst (Tixy)]

On Wed, 2011-09-21 at 12:55 +0100, Russell King - ARM Linux wrote:
> Instructions such as VFP, kprobes tracing, etc are expected fault
> locations, and those are fairly well controlled where they can be placed.
> With things like ftrace, it certainly is the case that the unwinder can
> theoretically be called from almost anywhere in a function.

Actually, kprobes can be places on any instruction in the kernel that
isn't in the section .kprobes.text.

I also strongly suspect that stack unwinding won't happen correctly
across the boundary between the kprobes handling code and the function
which was probed - there's an awful lot of stack jiggery pokery going on
there.

-- 
Tixy

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