| 1 | /* |
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| 2 | * memset routine for Z8000 |
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| 3 | * Copyright (C) 2004 Christian Groessler <chris@groessler.org> |
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| 4 | * |
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| 5 | * Permission to use, copy, modify, and distribute this file |
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| 6 | * for any purpose is hereby granted without fee, provided that |
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| 7 | * the above copyright notice and this notice appears in all |
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| 8 | * copies. |
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| 9 | * |
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| 10 | * This file is distributed WITHOUT ANY WARRANTY; without even the implied |
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| 11 | * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
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| 12 | */ |
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| 13 | |
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| 14 | /* void *memset(void *buffer, int value, size_t length); |
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| 15 | */ |
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| 16 | |
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| 17 | name "memset.S" |
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| 18 | |
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| 19 | .text |
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| 20 | even |
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| 21 | global _memset |
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| 22 | |
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| 23 | _memset: |
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| 24 | |
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| 25 | #ifdef __Z8001__ |
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| 26 | segm |
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| 27 | |
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| 28 | #ifdef __STD_CALL__ |
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| 29 | ldl rr6,rr14(#4) |
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| 30 | ld r5,rr14(#8) |
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| 31 | ldl rr2,rr14(#10) |
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| 32 | #else |
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| 33 | pushl @rr14,rr6 |
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| 34 | #endif |
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| 35 | |
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| 36 | /* rr2 - length |
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| 37 | * rl5 - value |
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| 38 | * rr6 - buffer |
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| 39 | */ |
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| 40 | testl rr2 |
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| 41 | jr z,finish |
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| 42 | |
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| 43 | ldb rh5,rl5 |
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| 44 | ld r1,r5 /* r1 contains value */ |
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| 45 | bit r7,#0 |
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| 46 | jr z,not_odd |
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| 47 | |
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| 48 | ldb @rr6,rl1 |
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| 49 | inc r7,#1 |
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| 50 | subl rr2,#1 |
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| 51 | jr z,finish |
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| 52 | |
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| 53 | not_odd:ld r0,r3 /* remember length */ |
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| 54 | srl r3,#1 |
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| 55 | jr z,no_words |
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| 56 | |
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| 57 | ldl rr4,rr6 |
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| 58 | ld @rr6,r1 |
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| 59 | inc r7,#2 |
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| 60 | dec r3,#1 |
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| 61 | jr z,no_words |
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| 62 | |
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| 63 | ldir @rr6,@rr4,r3 /* fill words */ |
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| 64 | |
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| 65 | no_words: |
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| 66 | bit r0,#0 /* one byte remaining? */ |
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| 67 | jr z,finish |
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| 68 | |
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| 69 | ldb @rr6,rl1 |
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| 70 | |
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| 71 | finish: |
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| 72 | #ifdef __STD_CALL__ |
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| 73 | ldl rr6,rr14(#4) |
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| 74 | #else |
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| 75 | popl rr2,@rr14 |
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| 76 | #endif |
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| 77 | |
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| 78 | |
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| 79 | #else /* above Z8001, below Z8002 */ |
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| 80 | |
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| 81 | |
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| 82 | unsegm |
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| 83 | |
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| 84 | #ifdef __STD_CALL__ |
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| 85 | ld r7,r15(#2) |
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| 86 | ld r6,r15(#4) |
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| 87 | ld r5,r15(#6) |
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| 88 | #else |
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| 89 | ld r2,r7 /* buffer pointer return value */ |
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| 90 | #endif |
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| 91 | |
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| 92 | /* r5 - length |
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| 93 | * r6 - value |
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| 94 | * r7 - buffer |
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| 95 | */ |
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| 96 | test r5 |
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| 97 | jr z,finish |
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| 98 | |
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| 99 | ldb rh6,rl6 |
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| 100 | ld r1,r6 /* r1 contains value */ |
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| 101 | bit r7,#0 |
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| 102 | jr z,not_odd |
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| 103 | |
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| 104 | ldb @r7,rl1 |
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| 105 | inc r7,#1 |
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| 106 | dec r5,#1 |
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| 107 | jr z,finish |
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| 108 | |
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| 109 | not_odd:ld r0,r5 /* remember length */ |
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| 110 | srl r5,#1 |
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| 111 | jr z,no_words |
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| 112 | |
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| 113 | ld r4,r7 |
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| 114 | ld @r7,r1 |
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| 115 | inc r7,#2 |
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| 116 | dec r5,#1 |
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| 117 | jr z,no_words |
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| 118 | |
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| 119 | ldir @r7,@r4,r5 /* fill words */ |
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| 120 | |
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| 121 | no_words: |
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| 122 | bit r0,#0 /* one byte remaining? */ |
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| 123 | jr z,finish |
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| 124 | |
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| 125 | ldb @r7,rl1 |
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| 126 | |
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| 127 | finish: |
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| 128 | #ifdef __STD_CALL__ |
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| 129 | ld r7,r15(#2) |
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| 130 | #endif |
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| 131 | |
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| 132 | #endif /* Z8002 */ |
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| 133 | |
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| 134 | ret |
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| 135 | .end |
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