121 lines
3.4 KiB
C
121 lines
3.4 KiB
C
/*
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* Copyright (C) 2018 Intel Corporation. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <hv_lib.h>
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#include <acrn_common.h>
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#include <hv_arch.h>
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#include <hv_debug.h>
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/***********************************************************************
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*
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* FUNCTION
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*
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* memcpy_s
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*
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* DESCRIPTION
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*
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* Copies at most slen bytes from src address to dest address,
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* up to dmax.
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*
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* INPUTS
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*
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* d pointer to Destination address
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* dmax maximum length of dest
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* s pointer to Source address
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* slen maximum number of bytes of src to copy
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*
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* OUTPUTS
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*
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* void * pointer to destination address if successful,
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* or else return null.
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*
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***********************************************************************/
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void *memcpy_s(void *d, size_t dmax, const void *s, size_t slen)
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{
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uint8_t *dest8;
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uint8_t *src8;
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if (slen == 0 || dmax == 0 || dmax < slen) {
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pr_err("%s: invalid src, dest buffer or length.", __func__);
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return NULL;
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}
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if ((d > s && d <= s + slen - 1)
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|| (d < s && s <= d + dmax - 1)) {
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pr_err("%s: overlap happened.", __func__);
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return NULL;
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}
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/*same memory block, no need to copy*/
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if (d == s)
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return d;
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dest8 = (uint8_t *)d;
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src8 = (uint8_t *)s;
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/*small data block*/
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if (slen < 8) {
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while (slen) {
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*dest8++ = *src8++;
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slen--;
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}
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return d;
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}
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/*make sure 8bytes-aligned for at least one addr.*/
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if ((!MEM_ALIGNED_CHECK(src8, 8)) && (!MEM_ALIGNED_CHECK(dest8, 8))) {
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for (; slen && (((uint64_t)src8) & 7); slen--)
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*dest8++ = *src8++;
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}
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/*copy main data blocks, with rep prefix*/
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if (slen > 8) {
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uint32_t ecx;
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asm volatile ("cld; rep; movsq"
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: "=&c"(ecx), "=&D"(dest8), "=&S"(src8)
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: "0" (slen / 8), "1" (dest8), "2" (src8)
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: "memory");
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slen = slen % 8;
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}
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/*tail bytes*/
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while (slen) {
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*dest8++ = *src8++;
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slen--;
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}
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return d;
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}
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