Date: Fri, 13 Jul 2012 10:15:25 +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 01:23:13 -0400]: > Another major omission shared with arm is that setjmp/longjmp cannot > preserve floating point registers. This is because I don't yet know > how to determine at runtime whether hard-float is available, and the > registers can't be saved unless they can be determined to exist. Help > solving this problem would also be appreciated. > then use compile time check: if libc is compiled with -msoft-float then dont save the registers otherwise save them i guess gcc has some predefined macro so you can check soft float at compile time when gcc compiles with hard float for mips there will be a a .gnu.attributes section in the object file which is dumped by readelf as Tag_GNU_MIPS_ABI_FP: Hard float (-mdouble-float) and binutils ld warns when such .o is linked with a soft-float .o so i think we shouldn't worry about applications using hard float while the libc is soft float as for runtime check on mips you may grep for '^ FPU' in /proc/cpuinfo on arm '^Features' tells the fpu variant but i guess these are not very robust http://git.kernel.org/?p=linux/kernel/git/stable/linux-stable.git;a=blob;f=arch/mips/kernel/proc.c http://git.kernel.org/?p=linux/kernel/git/stable/linux-stable.git;a=blob;f=arch/arm/kernel/setup.c
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