b6cbf7203b
This patch imports the unmodified current version of NetBSD libc. The NetBSD includes are in /nbsd_include, while the libc code itself is split between lib/nbsd_libc and common/lib/libc.
118 lines
3.6 KiB
ArmAsm
118 lines
3.6 KiB
ArmAsm
/* $NetBSD: memcpy.S,v 1.3 2011/01/15 07:31:12 matt Exp $ */
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/* stropt/memcpy_440.S, pl_string_common, pl_linux 10/11/04 11:45:36
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* ==========================================================================
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* Optimized memcpy implementation for IBM PowerPC 440.
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*
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* Copyright (c) 2003, IBM Corporation
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* * Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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* * Neither the name of IBM nor the names of its contributors
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* may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
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* OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
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* USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* ==========================================================================
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*
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* Function: Copy n bytes of the source to the destination. Behavior is
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* undefined for objects that overlap.
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*
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*
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* void *memcpy(void * dest, const void * src, int n)
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*
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* Input: r3 - destination address
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* r4 - source address
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* r5 - byte count
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* Output: r3 - destination address
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*
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* ==========================================================================
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*/
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#include <machine/asm.h>
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.text
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.align 4
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/* LINTSTUB: Func: void *memcpy(void *, const void *, size_t) */
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ENTRY(memcpy)
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/*
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* Check count passed in R5. If zero, return; otherwise continue.
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*/
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cmpwi %r5,0
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beqlr-
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mr %r8, %r3 /* Copy dst (return value) */
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addi %r4, %r4, -4 /* Prepare for main loop's auto */
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addi %r8, %r8, -4 /* update */
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srwi. %r9,%r5,2 /* Word count -> r9 */
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beq- last1 /* Partial copy if <4 bytes */
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mtctr %r9 /* Word cnt in CTR for loop */
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lwzu %r7, 4(%r4) /* Preload for main loop */
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b g1
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g0: /* Main loop */
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lwzu %r7, 4(%r4) /* Load a new word */
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stwu %r6, 4(%r8) /* Store previous word */
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g1:
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bdz- last /* Dec ctr and exit loop if no */
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/* more words */
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lwzu %r6, 4(%r4) /* Load another word */
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stwu %r7, 4(%r8) /* Store previous word */
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bdnz+ g0 /* Dec ctr and continue loop if */
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/* more words */
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mr %r7, %r6
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last:
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stwu %r7, 4(%r8) /* Store last word */
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last1: /* Byte-by-byte copy */
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clrlwi. %r5,%r5,30
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beqlr
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mtctr %r5
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lbzu %r6, 4(%r4) /* 1st byte: update by word */
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stbu %r6, 4(%r8)
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bdzlr-
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last2:
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lbzu %r6, 1(%r4) /* Handle the rest */
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stbu %r6, 1(%r8)
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bdnz+ last2
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blr
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END(memcpy)
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