[444] | 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/strncpy.c will be |
---|
| 33 | used. */ |
---|
| 34 | #if !defined (__OPTIMIZE_SIZE__) && !defined (PREFER_SIZE_OVER_SPEED) |
---|
| 35 | |
---|
| 36 | #include "asm.h" |
---|
| 37 | |
---|
| 38 | /* If dst and src are 4 byte aligned, copy 8 bytes at a time. |
---|
| 39 | If the src is 4, but not 8 byte aligned, we first read 4 bytes to get |
---|
| 40 | it 8 byte aligned. Thus, we can do a little read-ahead, without |
---|
| 41 | dereferencing a cache line that we should not touch. |
---|
| 42 | Note that short and long instructions have been scheduled to avoid |
---|
| 43 | branch stalls. |
---|
| 44 | The beq_s to r3z could be made unaligned & long to avoid a stall |
---|
| 45 | there, but the it is not likely to be taken often, and it |
---|
| 46 | would also be likey to cost an unaligned mispredict at the next call. */ |
---|
| 47 | |
---|
| 48 | #if !defined (__ARC601__) && defined (__ARC_BARREL_SHIFTER__) |
---|
| 49 | |
---|
| 50 | #if defined (__ARC700___) || defined (__ARCEM__) || defined (__ARCHS__) |
---|
| 51 | #define BRand(a,b,l) tst a,b ` bne_l l |
---|
| 52 | #else |
---|
| 53 | #define BRand(a,b,l) and a,a,b ` brne_s a,0,l |
---|
| 54 | #endif |
---|
| 55 | |
---|
| 56 | ENTRY (strncpy) |
---|
| 57 | cmp_s r2,8 |
---|
| 58 | or r12,r0,r1 |
---|
| 59 | bmsk.cc.f r12,r12,1 |
---|
| 60 | brne.d r12,0,.Lbytewise |
---|
| 61 | mov_s r10,r0 |
---|
| 62 | ld_s r3,[r1,0] |
---|
| 63 | mov r8,0x01010101 |
---|
| 64 | sub lp_count,r2,1 |
---|
| 65 | bbit0.d r1,2,.Loop_start |
---|
| 66 | ror r11,r8 |
---|
| 67 | sub r12,r3,r8 |
---|
| 68 | bic_l r12,r12,r3 |
---|
| 69 | BRand (r12,r11,.Lr3z) |
---|
| 70 | mov_s r4,r3 |
---|
| 71 | ld.a r3,[r1,4] |
---|
| 72 | sub lp_count,lp_count,4 |
---|
| 73 | st.ab r4,[r10,4] |
---|
| 74 | .balign 4 |
---|
| 75 | .Loop_start: |
---|
| 76 | lsr.f lp_count,lp_count,3 |
---|
| 77 | lpne .Loop_end |
---|
| 78 | ld.a r4,[r1,4] |
---|
| 79 | sub r12,r3,r8 |
---|
| 80 | bic_s r12,r12,r3 |
---|
| 81 | BRand (r12,r11,.Lr3z) |
---|
| 82 | st.ab r3,[r10,4] |
---|
| 83 | sub r12,r4,r8 |
---|
| 84 | bic r12,r12,r4 |
---|
| 85 | BRand (r12,r11,.Lr4z) |
---|
| 86 | ld.a r3,[r1,4] |
---|
| 87 | st.ab r4,[r10,4] |
---|
| 88 | .Loop_end: |
---|
| 89 | bcc_s .Lastword |
---|
| 90 | ld.a r4,[r1,4] |
---|
| 91 | sub r12,r3,r8 |
---|
| 92 | bic_s r12,r12,r3 |
---|
| 93 | BRand (r12,r11,.Lr3z) |
---|
| 94 | st.ab r3,[r10,4] |
---|
| 95 | mov_s r3,r4 |
---|
| 96 | .Lastword: |
---|
| 97 | and.f lp_count,r2,3 |
---|
| 98 | mov.eq lp_count,4 |
---|
| 99 | lp .Last_byte_end |
---|
| 100 | #ifdef __LITTLE_ENDIAN__ |
---|
| 101 | bmsk.f r1,r3,7 |
---|
| 102 | lsr.ne r3,r3,8 |
---|
| 103 | #else |
---|
| 104 | lsr.f r1,r3,24 |
---|
| 105 | asl.ne r3,r3,8 |
---|
| 106 | #endif |
---|
| 107 | stb.ab r1,[r10,1] |
---|
| 108 | .Last_byte_end: |
---|
| 109 | j_s [blink] |
---|
| 110 | |
---|
| 111 | .balign 4 |
---|
| 112 | .Lr4z: |
---|
| 113 | mov_l r3,r4 |
---|
| 114 | .Lr3z: |
---|
| 115 | #if defined (__ARC700__) || defined (__ARCEM__) || defined (__ARCHS__) |
---|
| 116 | #ifdef __LITTLE_ENDIAN__ |
---|
| 117 | bmsk.f r1,r3,7 |
---|
| 118 | lsr_s r3,r3,8 |
---|
| 119 | #else |
---|
| 120 | lsr.f r1,r3,24 |
---|
| 121 | asl_s r3,r3,8 |
---|
| 122 | #endif |
---|
| 123 | bne.d .Lr3z |
---|
| 124 | stb.ab r1,[r10,1] |
---|
| 125 | #else /* ! __ARC700__ */ |
---|
| 126 | #ifdef __LITTLE_ENDIAN__ |
---|
| 127 | bmsk.f r1,r3,7 |
---|
| 128 | .Lr3z_loop: |
---|
| 129 | lsr_s r3,r3,8 |
---|
| 130 | stb.ab r1,[r10,1] |
---|
| 131 | bne.d .Lr3z_loop |
---|
| 132 | bmsk.f r1,r3,7 |
---|
| 133 | #else |
---|
| 134 | lsr.f r1,r3,24 |
---|
| 135 | .Lr3z_loop: |
---|
| 136 | asl_s r3,r3,8 |
---|
| 137 | stb.ab r1,[r10,1] |
---|
| 138 | bne.d .Lr3z_loop |
---|
| 139 | lsr.f r1,r3,24 |
---|
| 140 | #endif /* ENDIAN */ |
---|
| 141 | #endif /* ! __ARC700__ */ |
---|
| 142 | .Lzero_rest: |
---|
| 143 | ; __strncpy_bzero requires: |
---|
| 144 | ; return value in r0 |
---|
| 145 | ; zeroing length in r2 |
---|
| 146 | ; zeroing start address in r3 |
---|
| 147 | mov_s r3,r10 |
---|
| 148 | add_s r2,r2,r0 |
---|
| 149 | b.d __strncpy_bzero |
---|
| 150 | sub_s r2,r2,r3 |
---|
| 151 | |
---|
| 152 | .balign 4 |
---|
| 153 | .Lbytewise: |
---|
| 154 | sub.f r2,r2,1 |
---|
| 155 | mov_l r3,r0 |
---|
| 156 | jcs [blink] |
---|
| 157 | .Lcharloop: |
---|
| 158 | ldb.ab r12,[r1,1] |
---|
| 159 | beq.d .Last_byte |
---|
| 160 | sub.f r2,r2,1 |
---|
| 161 | brne.d r12,0,.Lcharloop |
---|
| 162 | stb.ab r12,[r3,1] |
---|
| 163 | b.d __strncpy_bzero |
---|
| 164 | stb.ab r12,[r3,1] |
---|
| 165 | .Last_byte: |
---|
| 166 | j_s.d [blink] |
---|
| 167 | stb_l r12,[r3] |
---|
| 168 | ENDFUNC (strncpy) |
---|
| 169 | #endif /* !__ARC601__ && __ARC_BARREL_SHIFTER__ */ |
---|
| 170 | |
---|
| 171 | #endif /* !__OPTIMIZE_SIZE__ && !PREFER_SIZE_OVER_SPEED */ |
---|