Date: Fri, 24 Apr 2020 11:14:38 +1000 From: Tom Storey <tom@...ap.net> To: Rich Felker <dalias@...c.org> Cc: musl@...ts.openwall.com Subject: Re: Building for m68k Sorry to ask what sounds like a dumb question, but is cli;nonatomic_cas;sti basically "disable interrupts, do something equivalent to cas, re-enable interrupts"? That is what I had intended to do by ifdefing out the cas instruction itself. I wasn't going to leave it out because it's obviously there for a reason. :-) But simply for testing, it let me get beyond that point to see what else was hiding away that would cause some problems. On Fri, Apr 24, 2020, 10:51 Rich Felker <dalias@...c.org> wrote: > On Fri, Apr 24, 2020 at 10:36:23AM +1000, Tom Storey wrote: > > Thanks Rich. > > > > Just for gits and shiggles I tried #ifdef'ing out the cas.l instruction > in > > the atomic_arch.h file for 68020+ processors, and compilation then > > That won't work. But for NOMMU without a separate kernel domain it > would work to do cli;nonatomic_cas;sti (not sure what the actual m68k > insns for that are). There are plenty of places where a cas that does > nothing will break code, probably even during common paths in simple > programs. > > > proceeded along very smoothly for a while, but then hit another roadblock > > in src/setjmp/m68k/longjmp.s where it tries to execute a floating point > > instruction, and then subsequently fails with a "needs M68K fpu" error > > message. So maybe there was a way to work around that, but FPU adds > another > > dimension to this problem. > > You can add a softfloat ABI; nominally there even is one, but it's > clearly not working. The setjmp/longjmp files should be made .S > instead of .s with #if around the floating point save/restore > conditioned on being hardfloat ABI. > > > Trying to make this work is probably more than I'm really willing to take > > on for this project, so I may put it on the back burner and perhaps look > at > > You're really probably 90% there to at least having something that'll > build and that should run if you wire up syscalls. > > Rich > Content of type "text/html" skipped
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