On Tue, 29 Aug 2017 15:59:53 -0400, Thomas David Rivers wrote:

>The doc seems ambiguous to me; which leads me down this path
>of doing funky save-area machinations to ensure that all registers
>are saved - not just the "normal" ones.

STM  14,12,12(13)
hardly constitutes "doing funky save-area machinations".

Saving your caller's registers is a good practice, if for no other reason than 
to aid in debugging.
Diagnosing "clever" code that avoids the calling conventions is a PITA.

-- 
Tom Marchant

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