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 pDstPtr a2
61
62#define iVL a3
63#define iCurrentVL a4
64#define iActiveElemPos a5
65
66#define ELEM_LMUL_SETTING m1
67#define vMask1 v0
68#define vMask2 v1
69#define vStr1 v8
70#define vStr2 v16
71
72ENTRY(strcat_v)
73
74    mv pDstPtr, pDst
75
76    // the strlen of dst
77L(strlen_loop):
78    vsetvli iVL, zero, e8, ELEM_LMUL_SETTING, ta, ma
79
80    vle8ff.v vStr1, (pDstPtr)
81    // find the '\0'
82    vmseq.vx vMask1, vStr1, zero
83    csrr iCurrentVL, vl
84    vfirst.m iActiveElemPos, vMask1
85    add pDstPtr, pDstPtr, iCurrentVL
86    bltz iActiveElemPos, L(strlen_loop)
87
88    sub pDstPtr, pDstPtr, iCurrentVL
89    add pDstPtr, pDstPtr, iActiveElemPos
90
91    // copy pSrc to pDstPtr
92L(strcpy_loop):
93    vsetvli iVL, zero, e8, ELEM_LMUL_SETTING, ta, ma
94
95    vle8ff.v vStr1, (pSrc)
96    vmseq.vx vMask2, vStr1, zero
97    csrr iCurrentVL, vl
98    vfirst.m iActiveElemPos, vMask2
99    vmsif.m vMask1, vMask2
100    add pSrc, pSrc, iCurrentVL
101    vse8.v vStr1, (pDstPtr), vMask1.t
102    add pDstPtr, pDstPtr, iCurrentVL
103    bltz iActiveElemPos, L(strcpy_loop)
104
105    ret
106
107END(strcat_v)
108