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