819f13116e
The original code assumed that the load bias in the program headers would be exactly the same as in eh_frame/eh_frame_hdr/debug_frame. This isn't guaranteed, so add a section bias for use when creating a DwarfSection. In addtion, make the load bias and section bias a signed value. There is no reason that this value needs to be positive, so don't force it to be. Add a new offline test that has a different load bias in eh_frame than in the executable load. Add additional unit tests to verify the load bias values are set properly. Clean up the tests in ElfInterfaceTest, making all tests names follow the same convention. Bug: 141888859 Bug: 142094469 Test: New units and old unit tests pass on host and taimen. Change-Id: Ib878123ab5545f0f315c749cfe0d27b012d873ee
113 lines
3.4 KiB
C++
113 lines
3.4 KiB
C++
/*
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* Copyright (C) 2016 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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#ifndef _LIBUNWINDSTACK_MAP_INFO_H
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#define _LIBUNWINDSTACK_MAP_INFO_H
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#include <stdint.h>
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#include <atomic>
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#include <memory>
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#include <mutex>
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#include <string>
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#include <unwindstack/Elf.h>
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namespace unwindstack {
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class MemoryFileAtOffset;
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struct MapInfo {
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MapInfo(MapInfo* map_info, uint64_t start, uint64_t end, uint64_t offset, uint64_t flags,
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const char* name)
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: start(start),
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end(end),
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offset(offset),
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flags(flags),
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name(name),
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prev_map(map_info),
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load_bias(INT64_MAX),
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build_id(0) {}
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MapInfo(MapInfo* map_info, uint64_t start, uint64_t end, uint64_t offset, uint64_t flags,
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const std::string& name)
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: start(start),
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end(end),
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offset(offset),
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flags(flags),
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name(name),
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prev_map(map_info),
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load_bias(INT64_MAX),
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build_id(0) {}
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~MapInfo();
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uint64_t start = 0;
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uint64_t end = 0;
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uint64_t offset = 0;
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uint16_t flags = 0;
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std::string name;
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std::shared_ptr<Elf> elf;
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// The offset of the beginning of this mapping to the beginning of the
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// ELF file.
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// elf_offset == offset - elf_start_offset.
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// This value is only non-zero if the offset is non-zero but there is
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// no elf signature found at that offset.
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uint64_t elf_offset = 0;
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// This value is the offset into the file of the map in memory that is the
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// start of the elf. This is not equal to offset when the linker splits
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// shared libraries into a read-only and read-execute map.
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uint64_t elf_start_offset = 0;
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MapInfo* prev_map = nullptr;
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std::atomic_int64_t load_bias;
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// This is a pointer to a new'd std::string.
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// Using an atomic value means that we don't need to lock and will
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// make it easier to move to a fine grained lock in the future.
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std::atomic_uintptr_t build_id;
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// Set to true if the elf file data is coming from memory.
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bool memory_backed_elf = false;
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// This function guarantees it will never return nullptr.
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Elf* GetElf(const std::shared_ptr<Memory>& process_memory, ArchEnum expected_arch);
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uint64_t GetLoadBias(const std::shared_ptr<Memory>& process_memory);
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Memory* CreateMemory(const std::shared_ptr<Memory>& process_memory);
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bool GetFunctionName(uint64_t addr, std::string* name, uint64_t* func_offset);
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// Returns the raw build id read from the elf data.
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std::string GetBuildID();
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// Returns the printable version of the build id (hex dump of raw data).
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std::string GetPrintableBuildID();
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private:
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MapInfo(const MapInfo&) = delete;
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void operator=(const MapInfo&) = delete;
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Memory* GetFileMemory();
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bool InitFileMemoryFromPreviousReadOnlyMap(MemoryFileAtOffset* memory);
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// Protect the creation of the elf object.
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std::mutex mutex_;
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};
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} // namespace unwindstack
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#endif // _LIBUNWINDSTACK_MAP_INFO_H
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