1/* 2 Copyright (c) 2015, Synopsys, Inc. All rights reserved. 3 4 Redistribution and use in source and binary forms, with or without 5 modification, are permitted provided that the following conditions are met: 6 7 1) Redistributions of source code must retain the above copyright notice, 8 this list of conditions and the following disclaimer. 9 10 2) Redistributions in binary form must reproduce the above copyright notice, 11 this list of conditions and the following disclaimer in the documentation 12 and/or other materials provided with the distribution. 13 14 3) Neither the name of the Synopsys, Inc., nor the names of its contributors 15 may be used to endorse or promote products derived from this software 16 without specific prior written permission. 17 18 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 19 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 22 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28 POSSIBILITY OF SUCH DAMAGE. 29*/ 30 31/* This implementation is optimized for performance. For code size a generic 32 implementation of this function from newlib/libc/string/memset.c will be 33 used. */ 34#if !defined (__OPTIMIZE_SIZE__) && !defined (PREFER_SIZE_OVER_SPEED) 35 36#include "asm.h" 37 38/* ARC HS has it's own implementation of memset, yet we want this function 39 still to be compiled under "__dummy_memset" disguise, because strncpy 40 function uses __strncpy_bzero as a second entry point into memset. Would be 41 better to add __strncpy_bzero label to memset for ARC HS though, and even 42 better would be to avoid a second entry point into function. ARC HS always 43 has barrel-shifter, so this implementation will be always used for this 44 purpose. */ 45#if !defined (__ARC601__) && defined (__ARC_BARREL_SHIFTER__) 46 47/* To deal with alignment/loop issues, SMALL must be at least 2. */ 48#define SMALL 7 49 50 .global __strncpy_bzero 51 .hidden __strncpy_bzero 52/* __strncpy_bzero provides the following interface to strncpy: 53 r0: return value 54 r2: zeroing length 55 r3: zeroing start address 56 No attempt is made here for __strncpy_memset to speed up aligned 57 cases, because the copying of a string presumably leaves start address 58 and length alignment for the zeroing randomly distributed. */ 59 60#ifdef __ARCHS__ 61ENTRY (__dummy_memset) 62#else 63ENTRY (memset) 64#endif 65#if !defined (__ARC700__) && !defined (__ARCEM__) 66#undef SMALL 67#define SMALL 8 /* Even faster if aligned. */ 68 brls.d r2,SMALL,.Ltiny 69#endif 70 mov_s r3,r0 71 or r12,r0,r2 72 bmsk.f r12,r12,1 73 extb_s r1,r1 74 asl r12,r1,8 75 beq.d .Laligned 76 or_s r1,r1,r12 77#if defined (__ARC700__) || defined (__ARCEM__) 78 brls r2,SMALL,.Ltiny 79#endif 80.Lnot_tiny: 81 add_s r12,r2,r0 82 stb r1,[r12,-1] 83 bclr_l r12,r12,0 84 stw r1,[r12,-2] 85 bmsk.f r12,r3,1 86 add_s r2,r2,r12 87 sub.ne r2,r2,4 88 stb.ab r1,[r3,1] 89 bclr_s r3,r3,0 90 stw.ab r1,[r3,2] 91 bclr_s r3,r3,1 92.Laligned: ; This code address should be aligned for speed. 93#if defined (__ARC700__) || defined (__ARCEM__) 94 asl r12,r1,16 95 lsr.f lp_count,r2,2 96 or_s r1,r1,r12 97 lpne .Loop_end 98 st.ab r1,[r3,4] 99.Loop_end: 100 j_s [blink] 101#else /* !__ARC700 */ 102 lsr.f lp_count,r2,3 103 asl r12,r1,16 104 or_s r1,r1,r12 105 lpne .Loop_end 106 st.ab r1,[r3,4] 107 st.ab r1,[r3,4] 108.Loop_end: 109 jcc [blink] 110 j_s.d [blink] 111 st_s r1,[r3] 112#endif /* !__ARC700 */ 113 114#if defined (__ARC700__) || defined (__ARCEM__) 115 .balign 4 116__strncpy_bzero: 117 brhi.d r2,17,.Lnot_tiny 118 mov_l r1,0 119.Ltiny: 120 mov.f lp_count,r2 121 lpne .Ltiny_end 122 stb.ab r1,[r3,1] 123.Ltiny_end: 124 j_s [blink] 125#else /* !__ARC700__ */ 126#if SMALL > 8 127FIXME 128#endif 129 .balign 4 130__strncpy_bzero: 131 brhi.d r2,8,.Lnot_tiny 132 mov_s r1,0 133.Ltiny: 134 sub_s r2,r2,11 135 sub1 r12,pcl,r2 136 j_s [r12] 137 stb_s r1,[r3,7] 138 stb_s r1,[r3,6] 139 stb_s r1,[r3,5] 140 stb_s r1,[r3,4] 141 stb_s r1,[r3,3] 142 stb_s r1,[r3,2] 143 stb_s r1,[r3,1] 144 stb_s r1,[r3] 145 j_s [blink] 146#endif /* !__ARC700 */ 147#ifdef __ARCHS__ 148ENDFUNC (__dummy_memset) 149#else 150ENDFUNC (memset) 151#endif 152#endif /* !__ARC601__ && __ARC_BARREL_SHIFTER__ */ 153 154#endif /* !__OPTIMIZE_SIZE__ && !PREFER_SIZE_OVER_SPEED */ 155
