| /* |
| * Copyright (C) 2020 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #if defined(ANDROID_EXPERIMENTAL_MTE) |
| |
| #include <sys/ptrace.h> |
| #include <sys/uio.h> |
| |
| #include <bionic/mte.h> |
| #include <bionic/mte_kernel.h> |
| |
| #include "MemoryLocal.h" |
| #include "MemoryRemote.h" |
| |
| namespace unwindstack { |
| |
| long MemoryRemote::ReadTag(uint64_t addr) { |
| #if defined(__aarch64__) |
| char tag; |
| iovec iov = {&tag, 1}; |
| if (ptrace(PTRACE_PEEKMTETAGS, pid_, reinterpret_cast<void*>(addr), &iov) != 0 || |
| iov.iov_len != 1) { |
| return -1; |
| } |
| return tag; |
| #else |
| (void)addr; |
| return -1; |
| #endif |
| } |
| |
| long MemoryLocal::ReadTag(uint64_t addr) { |
| #if defined(__aarch64__) |
| // Check that the memory is readable first. This is racy with the ldg but there's not much |
| // we can do about it. |
| char data; |
| if (!mte_supported() || !Read(addr, &data, 1)) { |
| return -1; |
| } |
| |
| __asm__ __volatile__(".arch_extension mte; ldg %0, [%0]" : "+r"(addr) : : "memory"); |
| return (addr >> 56) & 0xf; |
| #else |
| (void)addr; |
| return -1; |
| #endif |
| } |
| |
| } // namespace unwindstack |
| |
| #endif |