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89 lines
2.7 KiB
C++
89 lines
2.7 KiB
C++
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// Copyright 2018 The Crashpad Authors. All rights reserved.
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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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#include "snapshot/fuchsia/memory_map_fuchsia.h"
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#include <zircon/syscalls.h>
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#include "base/fuchsia/fuchsia_logging.h"
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#include "util/numeric/checked_range.h"
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namespace crashpad {
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MemoryMapFuchsia::MemoryMapFuchsia() = default;
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MemoryMapFuchsia::~MemoryMapFuchsia() = default;
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bool MemoryMapFuchsia::Initialize(zx_handle_t process) {
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INITIALIZATION_STATE_SET_INITIALIZING(initialized_);
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// There's no way to know what an appropriate buffer size is before starting.
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// Start at a size that should be more than enough for any reasonable process.
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map_entries_.resize(4096);
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// Retrieving the maps is racy with new mappings being created, so retry this
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// loop up to |tries| times until the number of actual mappings retrieved
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// matches those available.
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int tries = 5;
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for (;;) {
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size_t actual;
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size_t available;
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zx_status_t status =
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zx_object_get_info(process,
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ZX_INFO_PROCESS_MAPS,
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&map_entries_[0],
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map_entries_.size() * sizeof(map_entries_[0]),
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&actual,
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&available);
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if (status != ZX_OK) {
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ZX_LOG(ERROR, status) << "zx_object_get_info ZX_INFO_PROCESS_MAPS";
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map_entries_.clear();
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return false;
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}
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if (actual < available && tries-- > 0) {
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// Make the buffer slightly larger than |available| to attempt to account
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// for the race between here and the next retrieval.
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map_entries_.resize(available + 20);
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continue;
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}
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map_entries_.resize(actual);
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INITIALIZATION_STATE_SET_VALID(initialized_);
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return true;
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}
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}
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bool MemoryMapFuchsia::FindMappingForAddress(zx_vaddr_t address,
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zx_info_maps_t* map) const {
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bool found = false;
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zx_info_maps_t result = {};
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for (const auto& m : map_entries_) {
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CheckedRange<zx_vaddr_t, size_t> range(m.base, m.size);
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if (range.ContainsValue(address)) {
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if (!found || m.depth > result.depth) {
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result = m;
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found = true;
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}
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}
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}
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if (found) {
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*map = result;
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}
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return found;
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}
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} // namespace crashpad
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