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/*
* Copyright (C) 2023 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.
*/
#ifndef ART_IMGDIAG_PAGE_UTIL_H_
#define ART_IMGDIAG_PAGE_UTIL_H_
#include <cstdint>
#include "base/array_ref.h"
#include "base/os.h"
#include "base/unix_file/fd_file.h"
namespace art {
static constexpr size_t kPageMapEntrySize = sizeof(uint64_t);
// bits 0-54 [in /proc/$pid/pagemap]
static constexpr uint64_t kPageFrameNumberMask = (1ULL << 55) - 1;
static constexpr size_t kPageFlagsEntrySize = sizeof(uint64_t);
static constexpr size_t kPageCountEntrySize = sizeof(uint64_t);
static constexpr uint64_t kPageFlagsDirtyMask = (1ULL << 4); // in /proc/kpageflags
static constexpr uint64_t kPageFlagsNoPageMask = (1ULL << 20); // in /proc/kpageflags
static constexpr uint64_t kPageFlagsMmapMask = (1ULL << 11); // in /proc/kpageflags
// Note: On failure, `page_flags_or_counts[.]` shall be clobbered.
bool GetPageFlagsOrCount(art::File& kpage_file,
uint64_t page_frame_number,
/*out*/ uint64_t& page_flags_or_count,
/*out*/ std::string& error_msg);
bool GetPageFlagsOrCounts(art::File& kpage_file,
ArrayRef<const uint64_t> page_frame_numbers,
/*out*/ ArrayRef<uint64_t> page_flags_or_counts,
/*out*/ std::string& error_msg);
// Note: On failure, `*page_frame_number` shall be clobbered.
bool GetPageFrameNumber(art::File& page_map_file,
size_t virtual_page_index,
/*out*/ uint64_t& page_frame_number,
/*out*/ std::string& error_msg);
bool GetPageFrameNumbers(art::File& page_map_file,
size_t virtual_page_index,
/*out*/ ArrayRef<uint64_t> page_frame_numbers,
/*out*/ std::string& error_msg);
struct ProcFiles {
// A File for reading /proc/<pid>/mem.
File mem;
// A File for reading /proc/<pid>/pagemap.
File pagemap;
// A File for reading /proc/kpageflags.
File kpageflags;
// A File for reading /proc/kpagecount.
File kpagecount;
};
bool OpenProcFiles(pid_t pid, /*out*/ ProcFiles& files, /*out*/ std::string& error_msg);
} // namespace art
#endif // ART_IMGDIAG_PAGE_UTIL_H_
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