| 1 | /* Copyright (C) 2000-2022 Free Software Foundation, Inc. |
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| 2 | This file is part of the GNU C Library. |
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| 3 | |
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| 4 | The GNU C Library is free software; you can redistribute it and/or |
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| 5 | modify it under the terms of the GNU Lesser General Public |
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| 6 | License as published by the Free Software Foundation; either |
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| 7 | version 2.1 of the License, or (at your option) any later version. |
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| 8 | |
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| 9 | The GNU C Library is distributed in the hope that it will be useful, |
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 12 | Lesser General Public License for more details. |
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| 13 | |
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| 14 | You should have received a copy of the GNU Lesser General Public |
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| 15 | License along with the GNU C Library. If not, see |
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| 16 | <https://www.gnu.org/licenses/>. */ |
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| 17 | |
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| 18 | /* Copy no more than N bytes from SRC to DEST, returning the address of |
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| 19 | the terminating '\0' in DEST. */ |
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| 20 | |
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| 21 | #include <sysdep.h> |
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| 22 | |
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| 23 | .arch ev6 |
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| 24 | .set noat |
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| 25 | .set noreorder |
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| 26 | .text |
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| 27 | |
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| 28 | ENTRY(__stpncpy) |
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| 29 | ldgp gp, 0(pv) |
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| 30 | #ifdef PROF |
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| 31 | lda AT, _mcount |
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| 32 | jsr AT, (AT), _mcount |
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| 33 | #endif |
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| 34 | .prologue 1 |
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| 35 | |
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| 36 | mov a0, v0 |
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| 37 | beq a2, $zerocount |
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| 38 | |
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| 39 | .align 4 |
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| 40 | nop |
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| 41 | nop |
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| 42 | jsr t9, __stxncpy # do the work of the copy |
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| 43 | |
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| 44 | cttz t8, t4 |
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| 45 | zapnot t0, t8, t5 |
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| 46 | andnot a0, 7, a0 |
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| 47 | bne a2, $multiword # do we have full words left? |
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| 48 | |
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| 49 | subq t8, 1, t2 |
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| 50 | subq t10, 1, t3 |
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| 51 | cmpult zero, t5, t5 |
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| 52 | addq a0, t4, v0 |
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| 53 | |
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| 54 | or t2, t8, t2 |
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| 55 | or t3, t10, t3 |
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| 56 | addq v0, t5, v0 |
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| 57 | andnot t3, t2, t3 |
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| 58 | |
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| 59 | zap t0, t3, t0 |
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| 60 | nop |
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| 61 | stq t0, 0(a0) |
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| 62 | ret |
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| 63 | |
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| 64 | $multiword: |
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| 65 | subq t8, 1, t7 # clear the final bits in the prev word |
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| 66 | cmpult zero, t5, t5 |
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| 67 | or t7, t8, t7 |
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| 68 | zapnot t0, t7, t0 |
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| 69 | |
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| 70 | subq a2, 1, a2 |
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| 71 | stq t0, 0(a0) |
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| 72 | addq a0, 8, a1 |
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| 73 | beq a2, 1f # loop over full words remaining |
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| 74 | |
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| 75 | nop |
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| 76 | nop |
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| 77 | nop |
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| 78 | blbc a2, 0f |
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| 79 | |
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| 80 | stq zero, 0(a1) |
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| 81 | subq a2, 1, a2 |
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| 82 | addq a1, 8, a1 |
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| 83 | beq a2, 1f |
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| 84 | |
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| 85 | 0: stq zero, 0(a1) |
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| 86 | subq a2, 2, a2 |
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| 87 | nop |
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| 88 | nop |
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| 89 | |
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| 90 | stq zero, 8(a1) |
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| 91 | addq a1, 16, a1 |
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| 92 | nop |
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| 93 | bne a2, 0b |
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| 94 | |
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| 95 | 1: ldq t0, 0(a1) # clear the leading bits in the final word |
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| 96 | subq t10, 1, t7 |
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| 97 | addq a0, t4, v0 |
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| 98 | nop |
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| 99 | |
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| 100 | or t7, t10, t7 |
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| 101 | addq v0, t5, v0 |
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| 102 | zap t0, t7, t0 |
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| 103 | stq t0, 0(a1) |
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| 104 | |
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| 105 | $zerocount: |
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| 106 | nop |
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| 107 | nop |
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| 108 | nop |
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| 109 | ret |
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| 110 | |
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| 111 | END(__stpncpy) |
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| 112 | |
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| 113 | libc_hidden_def (__stpncpy) |
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| 114 | weak_alias (__stpncpy, stpncpy) |
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| 115 | |
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