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https://github.com/autc04/Retro68.git
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111 lines
3.3 KiB
ArmAsm
111 lines
3.3 KiB
ArmAsm
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/*
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Copyright (c) 2015, Synopsys, Inc. All rights reserved.
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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 are met:
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1) Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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2) Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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3) Neither the name of the Synopsys, Inc., nor the names of its contributors
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may be used to endorse or promote products derived from this software
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without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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/* This implementation is optimized for performance. For code size a generic
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implementation of this function from newlib/libc/string/memset.c will be
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used. */
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#if !defined (__OPTIMIZE_SIZE__) && !defined (PREFER_SIZE_OVER_SPEED)
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#include "asm.h"
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#if defined (__ARC601__) \
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|| (!defined (__ARC_BARREL_SHIFTER__) && !defined (__ARCHS__))
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/* To deal with alignment/loop issues, SMALL must be at least 2. */
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#define SMALL 8 /* Even faster if aligned. */
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.global __strncpy_bzero
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.hidden __strncpy_bzero
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/* __strncpy_bzero provides the following interface to strncpy:
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r0: return value
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r2: zeroing length
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r3: zeroing start address
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No attempt is made here for __strncpy_memset to speed up aligned
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cases, because the copying of a string presumably leaves start address
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and length alignment for the zeroing randomly distributed. */
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ENTRY (memset)
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brls.d r2,SMALL,.Ltiny
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mov_s r3,r0
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or r12,r0,r2
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bmsk.f r12,r12,1
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breq_s r1,0,.Lbzero
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mov r4,0
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stb.a r1,[sp,-4]
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stb r1,[sp,1]
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stb r1,[sp,2]
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stb r1,[sp,3]
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ld.ab r1,[sp,4]
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.Lbzero:
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beq.d .Laligned
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.Lbzero2:
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add r6,r2,r3
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.Lnot_tiny:
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stb r1,[r6,-1]
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bclr r12,r6,0
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stw r1,[r12,-2]
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stb.ab r1,[r3,1]
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bclr_s r3,r3,0
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stw.ab r1,[r3,2]
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bclr_s r3,r3,1
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.Laligned: ; This code address should be aligned for speed.
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sub r6,r6,8
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brlo.d r6,r3,.Loop_end
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sub r6,r6,8
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3:
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st_l r1,[r3,4]
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brhs.d r6,r3,3b
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st.ab r1,[r3,8]
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.Loop_end:
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bic r12,r6,3
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j_s.d [blink]
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st_s r1,[r12,12]
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.balign 4
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__strncpy_bzero:
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brhi.d r2,8,.Lbzero2
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mov_s r1,0
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.Ltiny:
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sub_s r2,r2,11
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sub1 r12,pcl,r2
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j_s [r12]
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stb_s r1,[r3,7]
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stb_s r1,[r3,6]
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stb_s r1,[r3,5]
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stb_s r1,[r3,4]
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stb_s r1,[r3,3]
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stb_s r1,[r3,2]
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stb_s r1,[r3,1]
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stb_s r1,[r3]
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j_s [blink]
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ENDFUNC (memset)
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#endif /* __ARC601__ || (!__ARC_BARREL_SHIFTER__ && !__ARCHS__) */
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#endif /* !__OPTIMIZE_SIZE__ && !PREFER_SIZE_OVER_SPEED */
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