11bf8ce1d6
2003-07-22 H.J. Lu <hongjiu.lu@intel.com> * elf/dl-support.c (_dl_hwcap): New variable. (_dl_aux_init): Initialize GL(dl_hwcap) for static binaries. * sysdeps/i386/fpu/fclrexcpt.c: Include <unistd.h>, <ldsodefs.h> and <dl-procinfo.h>. (__feclearexcept): Clear MXCSR if needed. * sysdeps/i386/fpu/fsetexcptflg.c: Likewise. * sysdeps/i386/fpu_control.h (_FPU_GETCW, _FPU_SETCW): Document that newer hardware needs more than these macros. * sysdeps/i386/setfpucw.c: New file. 2003-07-22 Jakub Jelinek <jakub@redhat.com> * elf/Makefile (CFLAGS-ldconfig.c): Define IS_IN_ldconfig. * elf/ldconfig.c: Include dl-procinfo.c. (PROCINFO_CLASS): Define. * sysdeps/generic/ldsodefs.h (PROCINFO_CLASS): Define. * sysdeps/unix/sysv/linux/x86_64/dl-procinfo.c: New file. * sysdeps/unix/sysv/linux/x86_64/dl-procinfo.h: New file. * sysdeps/unix/sysv/linux/i386/dl-procinfo.c (PROCINFO_CLASS): Define if not yet defined. Use it instead of EXTERN. Undefine at the end of the file. * sysdeps/unix/sysv/linux/arm/dl-procinfo.c (PROCINFO_CLASS): Likewise. * sysdeps/unix/sysv/linux/sparc/sparc32/dl-procinfo.c (PROCINFO_CLASS): Likewise. * sysdeps/unix/sysv/linux/sparc/sparc64/dl-procinfo.c (PROCINFO_CLASS): Likewise. 2003-07-22 H.J. Lu <hongjiu.lu@intel.com> * elf/ldconfig.c (main): Issue a fatal error if relative path is used to build cache. 2003-07-22 Ulrich Drepper <drepper@redhat.com> * elf/readlib.c (process_file): Avoid possible overflow in assignment.
56 lines
1.7 KiB
C
56 lines
1.7 KiB
C
/* Set the FPU control word for x86.
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Copyright (C) 2003 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <math.h>
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#include <fpu_control.h>
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#include <fenv.h>
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#include <unistd.h>
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#include <ldsodefs.h>
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#include <dl-procinfo.h>
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void
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__setfpucw (fpu_control_t set)
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{
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fpu_control_t cw;
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/* Fetch the current control word. */
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__asm__ ("fnstcw %0" : "=m" (*&cw));
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/* Preserve the reserved bits, and set the rest as the user
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specified (or the default, if the user gave zero). */
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cw &= _FPU_RESERVED;
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cw |= set & ~_FPU_RESERVED;
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__asm__ ("fldcw %0" : : "m" (*&cw));
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/* If the CPU supports SSE, we set the MXCSR as well. */
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if ((GL(dl_hwcap) & HWCAP_I386_XMM) != 0)
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{
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unsigned int xnew_exc;
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/* Get the current MXCSR. */
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__asm__ ("stmxcsr %0" : "=m" (*&xnew_exc));
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xnew_exc &= ~((0xc00 << 3) | (FE_ALL_EXCEPT << 7));
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xnew_exc |= ((set & 0xc00) << 3) | ((set & FE_ALL_EXCEPT) << 7);
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__asm__ ("ldmxcsr %0" : : "m" (*&xnew_exc));
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}
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}
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