[RFC] Non-executable stack on SPARC

[Andrew Cagney]

>    Assuming that for VLIW gdb replaces the entire instruction bundle with a 
>    breakpoint, a breakpoint instruction can only ever generate a sigtrap 
>    (et.al.) (if executed) or sigsegv (if not accessible) so provided there 
>    is a breakpoint at the PC I don't think there is any possability of 
>    confusion (but again ignore decr pc after break :-).
> 
> So does this mean you're convinced that we can add SIGSEGV to the list
> currently consisting of SIGILL and SIGEMT unconditionally?  I haven't
> seen any ill effects on IA-32 and AMD64 (which are decr pc after
> break).  I'll happilly check in the origional patch in mainline too.

We've found no evidence to the contrary - if something later breaks we 
can add that to the testsuite.

Andrew