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Message-ID: <20120713204019.GD14463@port70.net>
Date: Fri, 13 Jul 2012 22:40:19 +0200
From: Szabolcs Nagy <nsz@...t70.net>
To: musl@...ts.openwall.com
Subject: Re: mips port working! & remaining issues
* Rich Felker <dalias@...ifal.cx> [2012-07-13 13:34:11 -0400]:
> On Fri, Jul 13, 2012 at 06:10:12PM +0200, Szabolcs Nagy wrote:
> > glibc seems to do runtime check for vfp and iwmmxt fpu on arm
> >
> > http://sourceware.org/git/?p=glibc.git;a=blob;f=ports/sysdeps/arm/setjmp.S
> >
> > and do compile time check on mips
> >
> > http://sourceware.org/git/?p=glibc.git;a=blob;f=ports/sysdeps/mips/setjmp_aux.c
>
> Thanks for digging up these for reference. I wonder if the auxv
> contains hw caps on mips too...?
>
i don't know, but i guess then mips code would use it as well
> On a side note, it's really unbelievable that mips setjmp is written
> in C on glibc and uclibc (which just copied from glibc). The compiler
> is completely free to clobber any of the registers that code is
> attempting to save (as long as the original value gets restored before
> the return statement) and as such their implementation is completely
> invalid unless you assume the compiler behaves in a particular way.
there is another place where register saving is implemented (getcontext)
and that is asm for mips as well
http://sourceware.org/git/?p=glibc.git;a=blob;f=ports/sysdeps/unix/sysv/linux/mips/getcontext.S
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