Re: STACK_BOUNDARY on alpha ports ?

[Richard Henderson <rth at redhat dot com>]

On Thu, Jan 22, 2004 at 12:31:38PM +0100, Olivier Hainque wrote:
>  The OpenVMS calling standard for alpha states (3.7.1 Call conventions):
> 
>    o Stack usage: At any time, the stack pointer must denote an address that
>      has the minimum alignment required by the Alpha hardware. In addition,
>      whenever control is transferred to another procedure, the stack must be
>      octaword aligned.
> 
>  Would setting STACK_BOUNDARY to 128 be the right way to address that ?

Well, it's a start.  I didn't see anything in the prologue code to
round up the stack frame size; that doesn't mean it isn't hiding
somewhere, but it does mean someone needs to look.

>  As for Unicos, the status of it's support in GCC is unclear to me.  
>  
>  The section in "supported platforms" is not attractive and I couldn't find
>  a mention of unicos in MAINTAINTERS.

Roman Lechtchinsky, cc'd, contributed the port.  Roman, the question
is what the unicos abi requires for stack pointer alignment.  All
the other ABIs require 16-byte alignment; is it the same there?


r~