[PATCH 5/5] ARM: Cortex-M3: Add support for exception handling

[Catalin Marinas]

On Fri, Feb 24, 2012 at 10:43:25PM +0000, Russell King - ARM Linux wrote:
> On Fri, Feb 24, 2012 at 10:12:06PM +0000, Catalin Marinas wrote:
> > Just to reply to Russell - yes, this part needs changing (could be the
> > pt_regs saving or just the signal and trace code that copies them to
> > user so that we preserve the ABI).
> 
> It's more than just that.  What about the various exception handling
> code which needs to look up registers by numerical index?  That
> encompasses kprobes, alignment fixup, swp emulation, fp exception
> fixup, and so forth.

Some of these don't apply to the M profile, like swp emulation (Thumb-2
only core). Anyway, it's not difficult to get the pt_regs structure back
to the standard layout.

Catalin