| Peter Collingbourne | 900d07d | 2019-10-28 13:11:00 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2019 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 | #include <platform/bionic/mte_kernel.h> |
| 30 | #include <private/bionic_ifuncs.h> |
| 31 | #include <stddef.h> |
| 32 | #include <sys/auxv.h> |
| 33 | |
| 34 | extern "C" { |
| 35 | |
| 36 | static bool supports_mte(unsigned long hwcap2) { |
| 37 | #ifdef ANDROID_EXPERIMENTAL_MTE |
| 38 | return hwcap2 & HWCAP2_MTE; |
| 39 | #else |
| 40 | (void)hwcap2; |
| 41 | return false; |
| 42 | #endif |
| 43 | } |
| 44 | |
| 45 | typedef void* memchr_func(const void*, int, size_t); |
| 46 | DEFINE_IFUNC_FOR(memchr) { |
| 47 | if (supports_mte(arg->_hwcap2)) { |
| 48 | RETURN_FUNC(memchr_func, memchr_mte); |
| 49 | } else { |
| 50 | RETURN_FUNC(memchr_func, memchr_default); |
| 51 | } |
| 52 | } |
| 53 | |
| 54 | typedef char* strchr_func(const char*, int); |
| 55 | DEFINE_IFUNC_FOR(strchr) { |
| 56 | if (supports_mte(arg->_hwcap2)) { |
| 57 | RETURN_FUNC(strchr_func, strchr_mte); |
| 58 | } else { |
| 59 | RETURN_FUNC(strchr_func, strchr_default); |
| 60 | } |
| 61 | } |
| 62 | |
| 63 | typedef int strcmp_func(const char*, const char*); |
| 64 | DEFINE_IFUNC_FOR(strcmp) { |
| 65 | if (supports_mte(arg->_hwcap2)) { |
| 66 | RETURN_FUNC(strcmp_func, strcmp_mte); |
| 67 | } else { |
| 68 | RETURN_FUNC(strcmp_func, strcmp_default); |
| 69 | } |
| 70 | } |
| 71 | |
| 72 | typedef size_t strlen_func(const char*); |
| 73 | DEFINE_IFUNC_FOR(strlen) { |
| 74 | if (supports_mte(arg->_hwcap2)) { |
| 75 | RETURN_FUNC(strlen_func, strlen_mte); |
| 76 | } else { |
| 77 | RETURN_FUNC(strlen_func, strlen_default); |
| 78 | } |
| 79 | } |
| 80 | |
| 81 | typedef int strncmp_func(const char*, const char*, int); |
| 82 | DEFINE_IFUNC_FOR(strncmp) { |
| 83 | if (supports_mte(arg->_hwcap2)) { |
| 84 | RETURN_FUNC(strncmp_func, strncmp_mte); |
| 85 | } else { |
| 86 | RETURN_FUNC(strncmp_func, strncmp_default); |
| 87 | } |
| 88 | } |
| 89 | |
| 90 | typedef size_t strnlen_func(const char*, int); |
| 91 | DEFINE_IFUNC_FOR(strnlen) { |
| 92 | if (supports_mte(arg->_hwcap2)) { |
| 93 | RETURN_FUNC(strnlen_func, strnlen_mte); |
| 94 | } else { |
| 95 | RETURN_FUNC(strnlen_func, strnlen_default); |
| 96 | } |
| 97 | } |
| 98 | |
| 99 | } // extern "C" |