On Mon, Sep 02, 2019 at 11:48:59AM +1000, Michael Ellerman wrote: > "Alastair D'Silva" <alast...@au1.ibm.com> writes: > > On Wed, 2019-08-21 at 22:27 +0200, Christophe Leroy wrote: > >> Can we be 100% sure that GCC won't add any code accessing some > >> global data or stack while the Data MMU is OFF ? > > > > +mpe > > > > I'm not sure how we would go about making such a guarantee, but I've > > tied every variable used to a register and addr is passed in a > > register, so there is no stack usage, and every call in there only > > operates on it's operands. > > That's not safe, I can believe it happens to work but the compiler > people will laugh at us if it ever breaks.
Yes. Sorry. > Let's leave it in asm. +1 The asm is simpler, more readable, more maintainable, and perhaps more performant even. Plus the being-laughed-at issue. Segher