Greetings! James Cowgill <james...@cowgill.org.uk> writes:
> 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 <matthew.fort...@imgtec.com> > Richard Sandiford <rdsandif...@googlemail.com> > Thanks! >> 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 > And thanks again! With gcl 2.6.12-25, I ntend to enforce LD_BIND_NOW on mips64 only, as the veneer would have to push and pop at least gp and ra regsiters in all cases just to support the stub, and this is of course slower. Is there any objection to your knowledge to binaries linked with -Wl,-z -Wl,now? Take care, > James -- Camm Maguire c...@maguirefamily.org ========================================================================== "The earth is but one country, and mankind its citizens." -- Baha'u'llah
