Re: mips port working! & remaining issues

[Szabolcs Nagy <nsz@port70.net>]

* Rich Felker <dalias@aerifal.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