On Thu, Jun 03, 2010 at 06:12:29PM +0200, Andreas Schwab wrote:
> It is basically working quite well. Unfortunately there is a big
> problem which becomes apparent when running the libstdc++ testsuite: the
> m68k compiler only guarantees a maximum alignment of 2 bytes, but the
> futex syscall requ
Richard Zidlicky writes:
> so the problem is reduced to alignment on stack and alignment in structs?
The problem is alignment.
Andreas.
--
Andreas Schwab, sch...@linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
"And now for something completely different
On Sat, Jun 05, 2010 at 11:21:42AM +0200, Andreas Schwab wrote:
> Richard Zidlicky writes:
>
> > As I see it the stack-allocated futex could be automagicaly aligned when
> > pushed as
> > argument to a function
>
> Futexes are indexed by address. You cannot move them around.
so the problem is
Richard Zidlicky writes:
> As I see it the stack-allocated futex could be automagicaly aligned when
> pushed as
> argument to a function
Futexes are indexed by address. You cannot move them around.
Andreas.
--
Andreas Schwab, sch...@linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1
Geert Uytterhoeven writes:
> IIRC, on Coldfire the stack is always 4-byte aligned.
m68k-linux also defines PREFERRED_STACK_BOUNDARY == 32, so there is hope
that it actually works.
Andreas.
--
Andreas Schwab, sch...@linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B
On Sat, Jun 05, 2010 at 12:21:47PM +1000, Finn Thain wrote:
>
> On Sat, 5 Jun 2010, Richard Zidlicky wrote:
>
> > I am not sure what happens if the futex is inside a "misaligned struct"
> > - would that be handled with an attribute of the futex?
>
> Is this problem confined to m68k? (All archit
On Sat, Jun 05, 2010 at 09:19:51AM +0200, Geert Uytterhoeven wrote:
> On Sat, Jun 5, 2010 at 00:52, Richard Zidlicky wrote:
> > On Fri, Jun 04, 2010 at 10:57:50PM +0200, Geert Uytterhoeven wrote:
> > this is the hardware behaviour but the compiler is free to use more
> > alignment
> > and it d
On Sat, Jun 5, 2010 at 04:21, Finn Thain wrote:
> On Sat, 5 Jun 2010, Richard Zidlicky wrote:
>> I am not sure what happens if the futex is inside a "misaligned struct"
>> - would that be handled with an attribute of the futex?
>
> Is this problem confined to m68k? (All architectures seem to be su
On Sat, Jun 5, 2010 at 00:52, Richard Zidlicky wrote:
> On Fri, Jun 04, 2010 at 10:57:50PM +0200, Geert Uytterhoeven wrote:
>> On Fri, Jun 4, 2010 at 21:15, Thorsten Glaser wrote:
>> > Andreas Schwab dixit:
>> >
>> >>One cost is ABI breakage.
>> >
>> > Hrm, that is true. But then: is that syscall
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