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
91 lines
2.6 KiB
C++
91 lines
2.6 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_DWARF_EH_FRAME_WITH_HDR_H
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#define _LIBUNWINDSTACK_DWARF_EH_FRAME_WITH_HDR_H
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#include <stdint.h>
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#include <unordered_map>
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#include <unwindstack/DwarfSection.h>
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namespace unwindstack {
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// Forward declarations.
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class Memory;
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template <typename AddressType>
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class DwarfEhFrameWithHdr : public DwarfSectionImpl<AddressType> {
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public:
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// Add these so that the protected members of DwarfSectionImpl
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// can be accessed without needing a this->.
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using DwarfSectionImpl<AddressType>::memory_;
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using DwarfSectionImpl<AddressType>::pc_offset_;
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using DwarfSectionImpl<AddressType>::entries_offset_;
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using DwarfSectionImpl<AddressType>::entries_end_;
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using DwarfSectionImpl<AddressType>::last_error_;
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using DwarfSectionImpl<AddressType>::section_bias_;
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struct FdeInfo {
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AddressType pc;
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uint64_t offset;
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};
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DwarfEhFrameWithHdr(Memory* memory) : DwarfSectionImpl<AddressType>(memory) {}
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virtual ~DwarfEhFrameWithHdr() = default;
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uint64_t GetCieOffsetFromFde32(uint32_t pointer) override {
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return this->memory_.cur_offset() - pointer - 4;
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}
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uint64_t GetCieOffsetFromFde64(uint64_t pointer) override {
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return this->memory_.cur_offset() - pointer - 8;
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}
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uint64_t AdjustPcFromFde(uint64_t pc) override {
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// The eh_frame uses relative pcs.
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return pc + this->memory_.cur_offset() - 4;
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}
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bool Init(uint64_t offset, uint64_t size, int64_t section_bias) override;
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const DwarfFde* GetFdeFromPc(uint64_t pc) override;
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bool GetFdeOffsetFromPc(uint64_t pc, uint64_t* fde_offset);
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const FdeInfo* GetFdeInfoFromIndex(size_t index);
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void GetFdes(std::vector<const DwarfFde*>* fdes) override;
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protected:
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uint8_t version_;
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uint8_t ptr_encoding_;
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uint8_t table_encoding_;
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size_t table_entry_size_;
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uint64_t ptr_offset_;
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uint64_t entries_data_offset_;
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uint64_t cur_entries_offset_ = 0;
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uint64_t fde_count_;
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std::unordered_map<uint64_t, FdeInfo> fde_info_;
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};
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} // namespace unwindstack
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#endif // _LIBUNWINDSTACK_DWARF_EH_FRAME_WITH_HDR_H
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