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 | #if defined (__ARC601__) \ |
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39 | || (!defined (__ARC_BARREL_SHIFTER__) && !defined (__ARCHS__)) |
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40 | |
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41 | /* To deal with alignment/loop issues, SMALL must be at least 2. */ |
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42 | #define SMALL 8 /* Even faster if aligned. */ |
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43 | |
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44 | .global __strncpy_bzero |
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45 | .hidden __strncpy_bzero |
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46 | /* __strncpy_bzero provides the following interface to strncpy: |
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47 | r0: return value |
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48 | r2: zeroing length |
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49 | r3: zeroing start address |
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50 | No attempt is made here for __strncpy_memset to speed up aligned |
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51 | cases, because the copying of a string presumably leaves start address |
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52 | and length alignment for the zeroing randomly distributed. */ |
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53 | |
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54 | ENTRY (memset) |
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55 | brls.d r2,SMALL,.Ltiny |
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56 | mov_s r3,r0 |
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57 | or r12,r0,r2 |
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58 | bmsk.f r12,r12,1 |
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59 | breq_s r1,0,.Lbzero |
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60 | mov r4,0 |
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61 | stb.a r1,[sp,-4] |
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62 | stb r1,[sp,1] |
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63 | stb r1,[sp,2] |
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64 | stb r1,[sp,3] |
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65 | ld.ab r1,[sp,4] |
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66 | .Lbzero: |
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67 | beq.d .Laligned |
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68 | .Lbzero2: |
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69 | add r6,r2,r3 |
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70 | .Lnot_tiny: |
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71 | stb r1,[r6,-1] |
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72 | bclr r12,r6,0 |
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73 | stw r1,[r12,-2] |
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74 | stb.ab r1,[r3,1] |
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75 | bclr_s r3,r3,0 |
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76 | stw.ab r1,[r3,2] |
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77 | bclr_s r3,r3,1 |
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78 | .Laligned: ; This code address should be aligned for speed. |
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79 | sub r6,r6,8 |
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80 | brlo.d r6,r3,.Loop_end |
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81 | sub r6,r6,8 |
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82 | 3: |
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83 | st_l r1,[r3,4] |
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84 | brhs.d r6,r3,3b |
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85 | st.ab r1,[r3,8] |
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86 | .Loop_end: |
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87 | bic r12,r6,3 |
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88 | j_s.d [blink] |
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89 | st_s r1,[r12,12] |
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90 | .balign 4 |
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91 | __strncpy_bzero: |
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92 | brhi.d r2,8,.Lbzero2 |
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93 | mov_s r1,0 |
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94 | .Ltiny: |
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95 | sub_s r2,r2,11 |
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96 | sub1 r12,pcl,r2 |
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97 | j_s [r12] |
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98 | stb_s r1,[r3,7] |
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99 | stb_s r1,[r3,6] |
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100 | stb_s r1,[r3,5] |
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101 | stb_s r1,[r3,4] |
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102 | stb_s r1,[r3,3] |
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103 | stb_s r1,[r3,2] |
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104 | stb_s r1,[r3,1] |
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105 | stb_s r1,[r3] |
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106 | j_s [blink] |
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107 | ENDFUNC (memset) |
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108 | #endif /* __ARC601__ || (!__ARC_BARREL_SHIFTER__ && !__ARCHS__) */ |
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109 | |
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110 | #endif /* !__OPTIMIZE_SIZE__ && !PREFER_SIZE_OVER_SPEED */ |
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