minix/lib/libc/arch/x86_64/gen/fpsetmask.S

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/* $NetBSD: fpsetmask.S,v 1.5 2012/01/19 16:37:18 drochner Exp $ */
/*
* Written by Frank van der Linden at Wasabi Systems for NetBSD.
* Public domain.
*/
#include <machine/asm.h>
/*
* XXX set both the x87 control word and the SSE mxcsr register.
* Applications should only set exception and round flags
* via the fp*() interface, otherwise the status words
* will get our of sync.
*/
#ifdef WEAK_ALIAS
WEAK_ALIAS(fpsetmask, _fpsetmask)
ENTRY(_fpsetmask)
#else
ENTRY(fpsetmask)
#endif
notl %edi
andl $0x0000003f,%edi
fnstcw -4(%rsp)
movl -4(%rsp), %edx
movl %edx, %eax
andl $0xffffffc0, %edx
orl %edi, %edx
movl %edx,-4(%rsp)
fldcw -4(%rsp)
stmxcsr -4(%rsp)
movl -4(%rsp), %edx
andl $0xffffe07f, %edx
sall $7, %edi
orl %edi, %edx
movl %edx,-4(%rsp)
ldmxcsr -4(%rsp)
notl %eax
andl $0x0000003f, %eax
ret