Re: [Xen-devel] mini-os: x86_64: crash passing double arguments

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Wed, 2014-07-02 at 13:44 +0100, Jan Beulich wrote:
> >>> On 02.07.14 at 14:37, <Ian.Campbell@xxxxxxxxxx> wrote:
> > I was assuming that 16-bytes (-mpreferred-stack-boundary=4) was the
> > implied default by the architecture's ABI, hence the compiler would
> > already naturally deal with things requiring 32 or 64 byte alignment
> > (with a starting assumption of 16-byte alignment on function entry).
> 
> That is the default in the absence of any other options. Someone
> adding -mavx or some such to their compiler options would, however,
> break this. One might argue that (s)he should then also add the
> other option, but we can as well be on the safe side from the
> beginning.

OK.

I wonder how e.g. pthreads handles this? Is there some gcc provided
#define which exposes the result of all these options so pthreads can
DTRT with the stacks?

> 
> Anyway - the judgment here is with the MiniOS maintainers.
> 
> Jan
> 



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