| 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/strncpy.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 | /* If dst and src are 4 byte aligned, copy 8 bytes at a time. |
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| 39 | If the src is 4, but not 8 byte aligned, we first read 4 bytes to get |
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| 40 | it 8 byte aligned. Thus, we can do a little read-ahead, without |
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| 41 | dereferencing a cache line that we should not touch. */ |
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| 42 | |
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| 43 | #if defined (__ARC601__) || !defined (__ARC_BARREL_SHIFTER__) |
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| 44 | |
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| 45 | #define BRand(a,b,l) and a,a,b ` brne_s a,0,l |
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| 46 | |
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| 47 | ENTRY (strncpy) |
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| 48 | cmp_s r2,8 |
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| 49 | or r12,r0,r1 |
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| 50 | bmsk.cc.f r12,r12,1 |
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| 51 | brne.d r12,0,.Lbytewise |
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| 52 | mov_s r10,r0 |
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| 53 | ld_s r3,[r1,0] |
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| 54 | mov r8,0x01010101 |
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| 55 | add r6,r0,r2 |
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| 56 | sub r6,r6,8 |
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| 57 | bbit0.d r1,2,.Loop_start |
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| 58 | ror r11,r8 |
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| 59 | sub r12,r3,r8 |
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| 60 | bic_l r12,r12,r3 |
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| 61 | BRand (r12,r11,.Lr3z) |
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| 62 | mov_s r4,r3 |
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| 63 | ld.a r3,[r1,4] |
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| 64 | st.ab r4,[r10,4] |
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| 65 | .balign 4 |
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| 66 | .Loop_start: |
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| 67 | brhs r10,r6,.Loop_end |
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| 68 | 1: |
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| 69 | ld.a r4,[r1,4] |
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| 70 | sub r12,r3,r8 |
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| 71 | bic_s r12,r12,r3 |
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| 72 | BRand (r12,r11,.Lr3z2) |
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| 73 | st.ab r3,[r10,8] |
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| 74 | sub r12,r4,r8 |
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| 75 | bic r12,r12,r4 |
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| 76 | BRand (r12,r11,.Lr4z) |
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| 77 | ld.a r3,[r1,4] |
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| 78 | brlo.d r10,r6,1b |
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| 79 | st r4,[r10,-4] |
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| 80 | .Loop_end: |
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| 81 | add r6,r6,4 |
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| 82 | brhs r10,r6,.Lastword |
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| 83 | sub r12,r3,r8 |
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| 84 | bic_s r12,r12,r3 |
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| 85 | BRand (r12,r11,.Lr3z) |
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| 86 | add_s r1,r1,4 |
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| 87 | st.ab r3,[r10,4] |
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| 88 | .Lastword: |
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| 89 | sub_s r2,r2,1 |
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| 90 | b.d .Lstart_charloop |
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| 91 | bmsk.f r2,r2,1 |
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| 92 | |
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| 93 | .balign 4 |
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| 94 | nop_s |
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| 95 | .Lr3z2: sub_s r1,r1,4 |
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| 96 | .Lr4z: |
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| 97 | .Lr3z: |
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| 98 | .balign 4 |
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| 99 | .Lr3z_loop: |
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| 100 | ldb.ab r3,[r1,1] |
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| 101 | brne.d r3,0,.Lr3z_loop |
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| 102 | stb.ab r3,[r10,1] |
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| 103 | |
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| 104 | .Lzero_rest: |
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| 105 | ; __strncpy_bzero requires: |
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| 106 | ; return value in r0 |
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| 107 | ; zeroing length in r2 |
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| 108 | ; zeroing start address in r3 |
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| 109 | mov_s r3,r10 |
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| 110 | add_s r2,r2,r0 |
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| 111 | b.d __strncpy_bzero |
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| 112 | sub_s r2,r2,r3 |
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| 113 | |
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| 114 | .balign 4 |
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| 115 | .Lbytewise: |
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| 116 | sub.f r2,r2,1 |
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| 117 | jcs [blink] |
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| 118 | .Lstart_charloop: |
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| 119 | mov_s r3,r10 |
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| 120 | .Lcharloop: |
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| 121 | ldb.ab r12,[r1,1] |
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| 122 | beq.d .Last_byte |
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| 123 | sub.f r2,r2,1 |
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| 124 | brne.d r12,0,.Lcharloop |
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| 125 | stb.ab r12,[r3,1] |
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| 126 | b.d __strncpy_bzero |
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| 127 | stb.ab r12,[r3,1] |
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| 128 | .Last_byte: |
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| 129 | j_s.d [blink] |
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| 130 | stb_s r12,[r3] |
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| 131 | ENDFUNC (strncpy) |
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| 132 | #endif /* __ARC601__ || !__ARC_BARREL_SHIFTER__ */ |
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| 133 | |
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| 134 | #endif /* !__OPTIMIZE_SIZE__ && !PREFER_SIZE_OVER_SPEED */ |
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