1/* $NetBSD: fpsetround.S,v 1.4 2011/09/30 17:42:34 christos Exp $ */ 2 3/* 4 * Written by Frank van der Linden at Wasabi Systems for NetBSD. 5 * Public domain. 6 */ 7 8#include <machine/asm.h> 9 10/* 11 * XXX set both the x87 control word and the SSE mxcsr register. 12 * Applications should only set exception and round flags 13 * via the fp*() interface, otherwise the status words 14 * will get our of sync. 15 */ 16 17 18#ifdef WEAK_ALIAS 19WEAK_ALIAS(fpsetround, _fpsetround) 20ENTRY(_fpsetround) 21#else 22ENTRY(fpsetround) 23#endif 24 25 fnstcw -4(%rsp) 26 movl -4(%rsp), %edx 27 movl %edx, %eax 28 andl $0x00000c00, %eax 29 andl $0xfffff3ff, %edx 30 orl %edi, %edx 31 movl %edx, -4(%rsp) 32 fldcw -4(%rsp) 33 34 stmxcsr -4(%rsp) 35 movl -4(%rsp), %edx 36 andl $0xffff9fff, %edx 37 sall $3, %edi 38 orl %edi,%edx 39 movl %edx,-4(%rsp) 40 ldmxcsr -4(%rsp) 41 42 ret 43