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Re: [avr-gcc-list] Re: [avr-libc-dev] [bug #29774] prologue/epilogue st

From: Bob Paddock
Subject: Re: [avr-gcc-list] Re: [avr-libc-dev] [bug #29774] prologue/epilogue stack pointer manipulation not interrupt safe in XMega
Date: Tue, 8 Jun 2010 12:31:09 -0400

> There are several places that handle SP adjustment:
> avr.c: output_movhi, expand_prologue, expand_epilogue
> avr.md: movhi_sp_r_irq_off, movhi_sp_r_irq_on (both generated in
> epilogue/prologue)
> libgcc.S: __prologue_saves__, __epilogue_restores__
> For changes in libgcc.S to take effect, appropriate builtin-defines must
> be provided so that the right multilib variants will be generated.

When I was patching my libgcc.a for the avrxmega7 lib, the only place
that I saw, that turned off the IRQs were the epilogue/prologue.
Is there some reason they don't need turned off in the other contexts?
 Seems like such a problem would have shown up long before now?

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