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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