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#include <private/bionic_asm.h> 57 58#define pDst a0 59#define pSrc a1 60#define iLength a2 61#define pDstPtr a3 62 63#define iVL a4 64#define iCurrentVL a5 65#define iActiveElemPos a6 66 67#define ELEM_LMUL_SETTING m1 68#define vMask1 v0 69#define vMask2 v1 70#define vStr1 v8 71#define vStr2 v16 72 73ENTRY(strncat_v) 74 75 mv pDstPtr, pDst 76 77 // the strlen of dst 78L(strlen_loop): 79 vsetvli iVL, zero, e8, ELEM_LMUL_SETTING, ta, ma 80 81 vle8ff.v vStr1, (pDstPtr) 82 // find the '\0' 83 vmseq.vx vMask1, vStr1, zero 84 csrr iCurrentVL, vl 85 vfirst.m iActiveElemPos, vMask1 86 add pDstPtr, pDstPtr, iCurrentVL 87 bltz iActiveElemPos, L(strlen_loop) 88 89 sub pDstPtr, pDstPtr, iCurrentVL 90 add pDstPtr, pDstPtr, iActiveElemPos 91 92 // copy pSrc to pDstPtr 93L(strcpy_loop): 94 vsetvli iVL, iLength, e8, ELEM_LMUL_SETTING, ta, ma 95 96 vle8ff.v vStr1, (pSrc) 97 vmseq.vx vMask2, vStr1, zero 98 csrr iCurrentVL, vl 99 vfirst.m iActiveElemPos, vMask2 100 vmsif.m vMask1, vMask2 101 add pSrc, pSrc, iCurrentVL 102 sub iLength, iLength, iCurrentVL 103 vse8.v vStr1, (pDstPtr), vMask1.t 104 add pDstPtr, pDstPtr, iCurrentVL 105 beqz iLength, L(fill_zero) 106 bltz iActiveElemPos, L(strcpy_loop) 107 108 ret 109 110L(fill_zero): 111 bgez iActiveElemPos, L(fill_zero_end) 112 sb zero, (pDstPtr) 113 114L(fill_zero_end): 115 ret 116 117END(strncat_v) 118