79 lines
2.0 KiB
C
79 lines
2.0 KiB
C
/*
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This program is part of the TACLeBench benchmark suite.
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Version V 1.x
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Name: memcpy.c
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Author: Torbjorn Granlund
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NIST Secure Hash Algorithm
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Copy memory to memory until the specified number of bytes
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has been copied. Overlap is NOT handled correctly.
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Source: GNU C Library
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Changes: no major functional changes
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License: Copyright (C) 1991, 1997, 2003 Free Software Foundation, Inc.
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*/
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#include "memcpy.h"
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// Wasm loop bounds
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__attribute__((import_module("__pragma"), import_name("loopbound"))) extern void
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__pragma_loopbound(unsigned int min_bound, unsigned int max_bound);
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void *
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sha_glibc_memcpy(void *dstpp, const void *srcpp, size_t len) {
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unsigned long int dstp = (long int) dstpp;
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unsigned long int srcp = (long int) srcpp;
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size_t __nbytes;
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/* Copy from the beginning to the end. */
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/* If there not too few bytes to copy, use word copy. */
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if (len >= OP_T_THRES) {
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/* Copy just a few bytes to make DSTP aligned. */
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len -= (-dstp) % OPSIZ;
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__nbytes = (-dstp) % OPSIZ;
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__pragma_loopbound(0, 0);
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while (__nbytes > 0) {
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BYTE __x = ((BYTE *) srcp)[0];
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srcp += 1;
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__nbytes -= 1;
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((BYTE *) dstp)[0] = __x;
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dstp += 1;
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}
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/* Copy whole pages from SRCP to DSTP by virtual address manipulation,
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as much as possible. */
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PAGE_COPY_FWD_MAYBE(dstp, srcp, len, len);
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/* Copy from SRCP to DSTP taking advantage of the known alignment of
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DSTP. Number of bytes remaining is put in the third argument,
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i.e. in LEN. This number may vary from machine to machine. */
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WORD_COPY_FWD(dstp, srcp, len, len);
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/* Fall out and copy the tail. */
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}
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/* There are just a few bytes to copy. Use byte memory operations. */
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__nbytes = len;
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__pragma_loopbound(0, 7);
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while (__nbytes > 0) {
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BYTE __x = ((BYTE *) srcp)[0];
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srcp += 1;
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__nbytes -= 1;
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((BYTE *) dstp)[0] = __x;
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dstp += 1;
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}
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return dstpp;
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}
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