Messages in this thread | | | Date | Thu, 19 Nov 2009 17:06:21 +0100 (CET) | From | Thomas Gleixner <> | Subject | Re: BUG: GCC-4.4.x changes the function frame on some functions |
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On Thu, 19 Nov 2009, Andrew Haley wrote: > Thomas Gleixner wrote: > > There is no real obvious reason why the edi magic needs to be done > > _before_ > > > > push %ebp > > mov %esp,%ebp > > Sure there is: unless you do the adjustment first %ebp won't be 16-aligned.
And why is this not done in 99% of the functions in the kernel, just in this one and some random others ?
> We're aligning the stack properly, as per the ABI requirements. Can't > you just fix the tracer?
Where is that ABI requirement that
push %ebp
needs to happen on an aligned stack ?
And why is this something GCC did not care about until GCC4.4 ?
Thanks,
tglx
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