Hi, On Thu, 2015-10-15 at 14:02 -0400, Camm Maguire wrote: > Greetings! Alas, I've misplaced the email you sent me with the > addresses of the mips experts. Perhaps you could reforward and cc > them.
These were the people: Matthew Fortune <[email protected]> Richard Sandiford <[email protected]> > In any case, I have this issue isolated in a qemu emulator, and can > foresee a fix. I have a remaining question. On mips32, it seems one > can safely assume the caller restores its own gp value after a call. On > mips64 this seems to be left up to the callee. Is this correct? Is > this affected by any compiler switches? I can answer that :) In n64 gp is callee saved, whereas in o32 it is caller saved, so you are correct. Since this is an absolute requirement of the ABI, I doubt there are any compiler switches for it. http://techpubs.sgi.com/library/dynaweb_docs/0640/SGI_Developer/books/Mpro_n32_ABI/sgi_html/ch02.html James
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