[M3devel] linuxlibc6 jmpbuf size?

[Tony Hosking]

Have you checked all the alignments?

On 15 Mar 2009, at 21:24, Jay wrote:

>
> The Linuxlibc6 jmpbuf size looks clearly wrong, just slightly  
> inflated.
> It should be 39 * address, not 40.
> Any objections to fixing it?
>
>
> This is the one that fits the signal mask.
> Only 6 addresses are needed if signal mask isn't saved.
> Plus 1 to record if it is saved.
> Plus 1024 bits for a glibc signal mask, even though the kernel only  
> supports 128 signals on mips and 64 on all others..big waste imho..
>
>
> 6 + 1 + 1024/32 = 39.
>
> Hm. I rather think we should shorten it to 6, 7, or 11 really, after  
> confirming we can.
> (11: 6 for registers, 1 to indicate if signal mask saved, 4 for  
> signal mask; or 7: 6 for registers and 1 to hold zero to indicate  
> signal mask not saved; or 6: registers and implied/known no signal  
> mask saved, if that is the case, I have to check).
>
> See
> http://lists.uclibc.org/pipermail/uclibc/2008-December/041674.html
>
> for details on the signal mask size..
>
> - Jay