| Yun Hsiang | 40a82d0 | 2023-05-26 10:10:40 +0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2023 The Android Open Source Project |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * * Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * * Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in |
| 12 | * the documentation and/or other materials provided with the |
| 13 | * distribution. |
| 14 | * |
| 15 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 16 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 17 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| 18 | * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| 19 | * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 20 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
| 21 | * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS |
| 22 | * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
| 23 | * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| 24 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| 25 | * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 26 | * SUCH DAMAGE. |
| 27 | */ |
| 28 | /* |
| 29 | * Copyright (c) 2023 SiFive, Inc. |
| 30 | * All rights reserved. |
| 31 | * |
| 32 | * Redistribution and use in source and binary forms, with or without |
| 33 | * modification, are permitted provided that the following conditions |
| 34 | * are met: |
| 35 | * 1. Redistributions of source code must retain the above copyright |
| 36 | * notice, this list of conditions and the following disclaimer. |
| 37 | * 2. Redistributions in binary form must reproduce the above copyright |
| 38 | * notice, this list of conditions and the following disclaimer in the |
| 39 | * documentation and/or other materials provided with the distribution. |
| 40 | * 3. The name of the company may not be used to endorse or promote |
| 41 | * products derived from this software without specific prior written |
| 42 | * permission. |
| 43 | * |
| 44 | * THIS SOFTWARE IS PROVIDED BY SIFIVE INC ``AS IS'' AND ANY EXPRESS OR IMPLIED |
| 45 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| 46 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 47 | * IN NO EVENT SHALL SIFIVE INC BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 48 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED |
| 49 | * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| 50 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| 51 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| 52 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| 53 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 54 | */ |
| 55 | |
| 56 | #if defined(__riscv_v) |
| 57 | |
| Elliott Hughes | bc192cf | 2023-08-04 15:08:38 -0700 | [diff] [blame] | 58 | #include <private/bionic_asm.h> |
| Yun Hsiang | 40a82d0 | 2023-05-26 10:10:40 +0800 | [diff] [blame] | 59 | |
| 60 | #define pStr a0 |
| 61 | #define pCopyStr a2 |
| 62 | #define iRetValue a0 |
| 63 | #define iMaxlen a1 |
| 64 | #define iCurrentVL a3 |
| 65 | #define iEndOffset a4 |
| 66 | |
| 67 | #define ELEM_LMUL_SETTING m1 |
| 68 | #define vStr v0 |
| 69 | #define vMaskEnd v8 |
| 70 | |
| 71 | ENTRY(strnlen_vext) |
| 72 | |
| 73 | mv pCopyStr, pStr |
| 74 | mv iRetValue, iMaxlen |
| 75 | L(strnlen_loop): |
| 76 | beqz iMaxlen, L(end_strnlen_loop) |
| 77 | vsetvli zero, iMaxlen, e8, ELEM_LMUL_SETTING, ta, ma |
| 78 | vle8ff.v vStr, (pCopyStr) |
| 79 | vmseq.vi vMaskEnd, vStr, 0 |
| 80 | vfirst.m iEndOffset, vMaskEnd /* first occurrence of \0 */ |
| 81 | csrr iCurrentVL, vl |
| 82 | add pCopyStr, pCopyStr, iCurrentVL |
| 83 | sub iMaxlen, iMaxlen, iCurrentVL |
| 84 | bltz iEndOffset, L(strnlen_loop) |
| 85 | add iMaxlen, iMaxlen, iCurrentVL |
| 86 | sub iRetValue, iRetValue, iMaxlen |
| 87 | add iRetValue, iRetValue, iEndOffset |
| 88 | L(end_strnlen_loop): |
| 89 | ret |
| 90 | |
| 91 | END(strnlen_vext) |
| 92 | |
| 93 | #endif |