Messages in this thread | | | Subject | Re: [PATCH -v4 9/9] tracing: add function graph tracer support for MIPS | From | Steven Rostedt <> | Date | Thu, 22 Oct 2009 12:11:56 -0400 |
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On Thu, 2009-10-22 at 08:59 -0700, David Daney wrote:
> This is what I was talking about up-thread. Leaf functions may have no > function prolog. If you do code scanning you will fail. While scanning > backwards, there is no way to know when you have entered a new function. > Looking for function return sequences 'jr ra' doesn't work as there > may be functions with multiple return sites, functions that never > return, or arbitrary data before the function. I think you have to > force a frame pointer to be established if you want this to work.
Functions that run off into another function?? I guess the compiler could do that, but with -pg enable, I would think is broken.
-- Steve
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