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Message-Id: <1256145813.18347.3210.camel@gandalf.stny.rr.com> Date: Wed, 21 Oct 2009 13:23:33 -0400 From: Steven Rostedt <rostedt@...dmis.org> To: David Daney <ddaney@...iumnetworks.com> Cc: Wu Zhangjin <wuzhangjin@...il.com>, linux-kernel@...r.kernel.org, linux-mips@...ux-mips.org, Thomas Gleixner <tglx@...utronix.de>, Ralf Baechle <ralf@...ux-mips.org>, Nicholas Mc Guire <der.herr@...r.at> Subject: Re: [PATCH -v4 9/9] tracing: add function graph tracer support for MIPS On Wed, 2009-10-21 at 10:07 -0700, David Daney wrote: > I have not used -pg, so I don't know for sure, I think all it does is > add the calls to _mcount. Someone could investigate > -fno-omit-frame-pointer, with that you may be able to use: Note, -pg assumes -fno-omit-frame-pointer, since -fomit-frame-pointer and -pg are incompatible. > > move s8,sp > > To identify function prologs, but it would still be ad hoc, as modern > versions of GCC will reorder instructions in the prolog for better > scheduling. I'll have to search the ABI documentation about calling _mcount in MIPS. There are assumptions with _mcount that are made. It may very well be safe to assume that the move s8,sp will always be there before an mcount call. -- Steve -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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