[444] | 1 | /* |
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| 2 | Copyright (c) 2015, Synopsys, Inc. All rights reserved. |
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| 3 | |
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| 4 | Redistribution and use in source and binary forms, with or without |
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| 5 | modification, are permitted provided that the following conditions are met: |
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| 6 | |
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| 7 | 1) Redistributions of source code must retain the above copyright notice, |
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| 8 | this list of conditions and the following disclaimer. |
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| 9 | |
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| 10 | 2) Redistributions in binary form must reproduce the above copyright notice, |
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| 11 | this list of conditions and the following disclaimer in the documentation |
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| 12 | and/or other materials provided with the distribution. |
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| 13 | |
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| 14 | 3) Neither the name of the Synopsys, Inc., nor the names of its contributors |
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| 15 | may be used to endorse or promote products derived from this software |
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| 16 | without specific prior written permission. |
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| 17 | |
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| 18 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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| 19 | AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 20 | IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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| 21 | ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
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| 22 | LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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| 23 | CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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| 24 | SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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| 25 | INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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| 26 | CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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| 27 | ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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| 28 | POSSIBILITY OF SUCH DAMAGE. |
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| 29 | */ |
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| 30 | |
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| 31 | /* This implementation is optimized for performance. For code size a generic |
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| 32 | implementation of this function from newlib/libc/string/memset.c will be |
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| 33 | used. */ |
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| 34 | #if !defined (__OPTIMIZE_SIZE__) && !defined (PREFER_SIZE_OVER_SPEED) |
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| 35 | |
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| 36 | #include "asm.h" |
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| 37 | |
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| 38 | /* ARC HS has it's own implementation of memset, yet we want this function |
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| 39 | still to be compiled under "__dummy_memset" disguise, because strncpy |
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| 40 | function uses __strncpy_bzero as a second entry point into memset. Would be |
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| 41 | better to add __strncpy_bzero label to memset for ARC HS though, and even |
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| 42 | better would be to avoid a second entry point into function. ARC HS always |
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| 43 | has barrel-shifter, so this implementation will be always used for this |
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| 44 | purpose. */ |
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| 45 | #if !defined (__ARC601__) && defined (__ARC_BARREL_SHIFTER__) |
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| 46 | |
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| 47 | /* To deal with alignment/loop issues, SMALL must be at least 2. */ |
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| 48 | #define SMALL 7 |
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| 49 | |
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| 50 | .global __strncpy_bzero |
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| 51 | .hidden __strncpy_bzero |
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| 52 | /* __strncpy_bzero provides the following interface to strncpy: |
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| 53 | r0: return value |
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| 54 | r2: zeroing length |
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| 55 | r3: zeroing start address |
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| 56 | No attempt is made here for __strncpy_memset to speed up aligned |
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| 57 | cases, because the copying of a string presumably leaves start address |
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| 58 | and length alignment for the zeroing randomly distributed. */ |
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| 59 | |
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| 60 | #ifdef __ARCHS__ |
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| 61 | ENTRY (__dummy_memset) |
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| 62 | #else |
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| 63 | ENTRY (memset) |
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| 64 | #endif |
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| 65 | #if !defined (__ARC700__) && !defined (__ARCEM__) |
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| 66 | #undef SMALL |
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| 67 | #define SMALL 8 /* Even faster if aligned. */ |
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| 68 | brls.d r2,SMALL,.Ltiny |
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| 69 | #endif |
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| 70 | mov_s r3,r0 |
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| 71 | or r12,r0,r2 |
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| 72 | bmsk.f r12,r12,1 |
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| 73 | extb_s r1,r1 |
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| 74 | asl r12,r1,8 |
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| 75 | beq.d .Laligned |
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| 76 | or_s r1,r1,r12 |
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| 77 | #if defined (__ARC700__) || defined (__ARCEM__) |
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| 78 | brls r2,SMALL,.Ltiny |
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| 79 | #endif |
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| 80 | .Lnot_tiny: |
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| 81 | add_s r12,r2,r0 |
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| 82 | stb r1,[r12,-1] |
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| 83 | bclr_l r12,r12,0 |
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| 84 | stw r1,[r12,-2] |
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| 85 | bmsk.f r12,r3,1 |
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| 86 | add_s r2,r2,r12 |
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| 87 | sub.ne r2,r2,4 |
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| 88 | stb.ab r1,[r3,1] |
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| 89 | bclr_s r3,r3,0 |
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| 90 | stw.ab r1,[r3,2] |
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| 91 | bclr_s r3,r3,1 |
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| 92 | .Laligned: ; This code address should be aligned for speed. |
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| 93 | #if defined (__ARC700__) || defined (__ARCEM__) |
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| 94 | asl r12,r1,16 |
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| 95 | lsr.f lp_count,r2,2 |
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| 96 | or_s r1,r1,r12 |
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| 97 | lpne .Loop_end |
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| 98 | st.ab r1,[r3,4] |
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| 99 | .Loop_end: |
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| 100 | j_s [blink] |
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| 101 | #else /* !__ARC700 */ |
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| 102 | lsr.f lp_count,r2,3 |
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| 103 | asl r12,r1,16 |
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| 104 | or_s r1,r1,r12 |
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| 105 | lpne .Loop_end |
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| 106 | st.ab r1,[r3,4] |
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| 107 | st.ab r1,[r3,4] |
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| 108 | .Loop_end: |
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| 109 | jcc [blink] |
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| 110 | j_s.d [blink] |
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| 111 | st_s r1,[r3] |
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| 112 | #endif /* !__ARC700 */ |
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| 113 | |
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| 114 | #if defined (__ARC700__) || defined (__ARCEM__) |
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| 115 | .balign 4 |
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| 116 | __strncpy_bzero: |
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| 117 | brhi.d r2,17,.Lnot_tiny |
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| 118 | mov_l r1,0 |
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| 119 | .Ltiny: |
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| 120 | mov.f lp_count,r2 |
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| 121 | lpne .Ltiny_end |
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| 122 | stb.ab r1,[r3,1] |
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| 123 | .Ltiny_end: |
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| 124 | j_s [blink] |
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| 125 | #else /* !__ARC700__ */ |
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| 126 | #if SMALL > 8 |
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| 127 | FIXME |
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| 128 | #endif |
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| 129 | .balign 4 |
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| 130 | __strncpy_bzero: |
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| 131 | brhi.d r2,8,.Lnot_tiny |
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| 132 | mov_s r1,0 |
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| 133 | .Ltiny: |
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| 134 | sub_s r2,r2,11 |
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| 135 | sub1 r12,pcl,r2 |
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| 136 | j_s [r12] |
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| 137 | stb_s r1,[r3,7] |
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| 138 | stb_s r1,[r3,6] |
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| 139 | stb_s r1,[r3,5] |
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| 140 | stb_s r1,[r3,4] |
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| 141 | stb_s r1,[r3,3] |
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| 142 | stb_s r1,[r3,2] |
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| 143 | stb_s r1,[r3,1] |
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| 144 | stb_s r1,[r3] |
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| 145 | j_s [blink] |
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| 146 | #endif /* !__ARC700 */ |
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| 147 | #ifdef __ARCHS__ |
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| 148 | ENDFUNC (__dummy_memset) |
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| 149 | #else |
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| 150 | ENDFUNC (memset) |
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| 151 | #endif |
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| 152 | #endif /* !__ARC601__ && __ARC_BARREL_SHIFTER__ */ |
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| 153 | |
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| 154 | #endif /* !__OPTIMIZE_SIZE__ && !PREFER_SIZE_OVER_SPEED */ |
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