Differential D15368 Diff 55279 lib/libc/powerpc64/string/ppc64_bcopy.c

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lib/libc/powerpc64/string/ppc64_bcopy.c

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				/*-
				* Copyright (c) 2018 Instituto de Pesquisas Eldorado
				* All rights reserved.
				*
				* Redistribution and use in source and binary forms, with or without
				* modification, are permitted provided that the following conditions
				* are met:
				* 1. Redistributions of source code must retain the above copyright
				* notice, this list of conditions and the following disclaimer.
				* 2. Redistributions in binary form must reproduce the above copyright
				* notice, this list of conditions and the following disclaimer in the
				* documentation and/or other materials provided with the distribution.
				* 3. Neither the name of the author nor the names of its contributors may
				* be used to endorse or promote products derived from this software
				*
				* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
				* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
				* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
				* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
				* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
				* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
				* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
				* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
				* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
				* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
				* SUCH DAMAGE.
				*
				*/

				#include <sys/cdefs.h>
				__FBSDID("$FreeBSD$");

				#include <sys/types.h>
				#include <sys/auxv.h>
				#include <machine/cpu.h>
				#include <machine/atomic.h>
				#include <stdlib.h>

				#ifdef MEMCOPY
				extern int bcopy_has_vsx;
				extern void* memcpy_plain(void dst, const void src, size_t len);
				extern void* memcpy_vsx(void dst, const void src, size_t len);

				void* memcpy(void dst, const void src, size_t len)
				#elif defined(MEMMOVE)
				extern int bcopy_has_vsx;
				extern void* bcopy_plain(void dst, const void src, size_t len);
				extern void* bcopy_vsx(void dst, const void src, size_t len);

				void* memmove(void dst, const void src, size_t len)
				#else
				int bcopy_has_vsx = -1;
				extern void* bcopy_plain(void dst, const void src, size_t len);
				extern void* bcopy_vsx(void dst, const void src, size_t len);

				void bcopy(const void src, void dst, size_t len)
				#endif
				{
				/* XXX: all of this should be replaced with ifunc code once it's available */
				if (bcopy_has_vsx < 0) {
				/*
				* Initialize bcopy_has_vsx to 0, at least until elf_aux_info() returns.
				* Otherwise, if elf_aux_info() calls bcopy/memcpy/memmove, we would enter an infinite loop.
				*/
				if (atomic_cmpset_int(&bcopy_has_vsx, -1, 0) != 0) {
				u_long hwcap;

				if (elf_aux_info(AT_HWCAP, &hwcap, sizeof(hwcap)) == 0 &&
				(hwcap & PPC_FEATURE_HAS_VSX) != 0) {
				atomic_set_int(&bcopy_has_vsx, 1);
				}
				}
				}

				if (bcopy_has_vsx > 0) {
				/* VSX is supported */
				#if defined(MEMCOPY)
				return memcpy_vsx(dst, src, len);
				#elif defined(MEMMOVE)
				return bcopy_vsx(dst, src, len);
				#else
				bcopy_vsx(dst, src, len);
				#endif
				} else {
				/* VSX is not supported */
				#if defined(MEMCOPY)
				return memcpy_plain(dst, src, len);
				#elif defined(MEMMOVE)
				return bcopy_plain(dst, src, len);
				#else
				bcopy_plain(dst, src, len);
				#endif
				}
				}