1 /* 2 * Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved. 3 * Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without modification, 6 * are permitted provided that the following conditions are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright notice, this list of 9 * conditions and the following disclaimer. 10 * 11 * 2. Redistributions in binary form must reproduce the above copyright notice, this list 12 * of conditions and the following disclaimer in the documentation and/or other materials 13 * provided with the distribution. 14 * 15 * 3. Neither the name of the copyright holder nor the names of its contributors may be used 16 * to endorse or promote products derived from this software without specific prior written 17 * permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 21 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 23 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 24 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 26 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 27 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 28 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 29 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include "asm.h" 33 34 .syntax unified 35 .arm 36 37 // errno_t _arm_put_user(void *dst, const void *src, size_t dstTypeLen, size_t srcTypeLen) 38 FUNCTION(_arm_put_user) 39 stmdb sp!, {r0, r1, r2, r3, lr} 40 cmp r2, #0 41 beq .Lget_user_return 42 cmp r2, r3 43 bne .Lget_user_err 44 cmp r2, #1 45 bhi .Lget_user_half 46 .Lget_user_byte: 47 0: ldrb r3, [r1], #0 48 1: strbt r3, [r0], #0 49 b .Lget_user_return 50 .Lget_user_half: 51 cmp r2, #2 52 bhi .Lget_user_word 53 2: ldrh r3, [r1], #0 54 3: strht r3, [r0], #0 55 b .Lget_user_return 56 .Lget_user_word: 57 cmp r2, #4 58 bhi .Lget_user_err 59 4: ldr r3, [r1], #0 60 5: strt r3, [r0], #0 61 .Lget_user_return: 62 ldmia sp!, {r0, r1, r2, r3, lr} 63 mov r0, 0 64 bx lr 65 .Lget_user_err: 66 ldmia sp!, {r0, r1, r2, r3, lr} 67 mov r0, #-14 68 bx lr 69 70 .pushsection __exc_table, "a" 71 .long 0b, .Lget_user_err 72 .long 1b, .Lget_user_err 73 .long 2b, .Lget_user_err 74 .long 3b, .Lget_user_err 75 .long 4b, .Lget_user_err 76 .long 5b, .Lget_user_err 77 .popsection 78