On Thu, 2009-10-22 at 21:31 +0800, Wu Zhangjin wrote: > > If we don't stop at just one save, but look for the saving of ra, it > > should not fail. > > > > We can not look for the saving of ra continuously(when should we stop? When we hit something other than sw .... I'm sure we will get to something other than a store. ;-) > if with -fno-omit-fram-pointer, we have "move s8,sp" or "addiu sp, sp, > -offset", but without it, we have no "guideboard" to know that is the > beginning of the function!), 'Cause we may find the saving of ra of > another function, which will fail at that time. But that other function should have a jump to mcount before it, or some other kind of return. A function that has _mcount attached, can not be inlined. So something must have jumped to it. There should be no cases where code from above just "falls" into the leaf function. > > BTW: Just replace probe_kernel_read() and tracing_stop/tracing_start by > asm, it works in 32bit, but fails in 64bit, I'm trying to find why!(TLB > miss on load or ifetch, will fix it asap! and resend the patchset out!) Thanks! -- Steve Note, I'm going to try booting a vanilla kernel on the notebook. If it works, I'll start applying your patches and playing with it too. But I also have some other work to do first.
