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From: Mark<mark@j...>
Date: Wed Jul 30 00:38:43 CEST 2008
Subject: [openrisc] Stack frame alignment on OpenRISC 1000
Jeremy Bennett wrote:
> The Application Binary Interface (ABI) for the OR1000 specifies that all
> stack frames are double word aligned (section 16.2.2):
>
> "The stack pointer always points to the end of the latest allocated
> stack frame. All frames must be double word aligned. In code compiled
> for 32-bit implementations, upper halves of all double words are zero."
>
---8<---
>
> Can anyone shed more light on this issue. For now I'll assume the
> documentation is in error (it affects the port of GDB 6.8).
>

I've also looked at this in the past and thought that it no longer
applied. I assumed it was to support the (never implemented?) 64-bit
OpenRISC ISA. On second thought, perhaps it has to do with cache line
sizes or the MMU?

Incidentally, many many many thanks for working on a new GDB port. It's
been on my TODO list for over a year, looks like you'll beat me to it.

Cheers,

Mark.