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Date: Tue, 01 Sep 2009 15:43:59 +0100 From: Catalin Marinas <catalin.marinas@....com> To: Russell King <rmk+lkml@....linux.org.uk> Cc: venki kaps <venkiece2005@...il.com>, Nicolas Pitre <nico@....org>, "sagar.abhishek@...il.com" <sagar.abhishek@...il.com>, "jkenisto@...ibm.com" <jkenisto@...ibm.com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "prasanna@...ibm.com" <prasanna@...ibm.com> Subject: Re: ARM + jprobes/kretprobes SEGV/hangs/OOPS in 2.6.29 kernel On Tue, 2009-09-01 at 15:25 +0100, Russell King wrote: > On Tue, Sep 01, 2009 at 02:54:54PM +0100, Catalin Marinas wrote: > > venki kaps <venkiece2005@...il.com> wrote: > > > I have found the exact problem with respect to ARM jprobes. > > > > > > The problem with configure i.e, CONFIG_ARM_UNWIND = y; is enabled. > > > > I haven't followed the kprobes implementation for ARM but does it make > > any assumptions about the existence of a frame pointer on the stack? > > Enabling stack unwinding automatically disables the framepointer. > > If it uses CALLER_ADDRESSx() then it won't work with unwinding enabled. > See 5613/1 (which is pending in the devel branch.) In addition to that, when CONFIG_FRAME_POINTER is disabled, the lr register isn't always saved on the stack by the called function. I'm not sure whether kretprobe_trampoline is aware of this. -- Catalin -- 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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