rearnsha@buzzard.freeserve.co.uk (Richard Earnshaw) writes:
> This 
> isn't a major problem if momentary stack unalignemnt is OK, but issues 
> such as asynchronous events have to be considered (for example, if a 
> signal were received when the stack was not 8-byte aligned, would the 
> signal handler function correctly -- in particular, would it run on its 
> own stack, or on the stack of the current process?).

That particular one is easy: if 8-byte alignment on function entry is
mandated, the kernel could be sure to align the SP to 8 bytes before
invoking the user signal handler...

(It seems that if ATPCS requires 8 byte alignment on entry & exit, if
we want to support that -- i dunno anything about it -- then we've
gotta make sure the stack is properly aligned on signal handler entry
as well...)



cgd