3958f8060a
This cl includes the code to read arm unwind information from a shared library. Bug: 23762183 Test: Passes all unit tests. I can dump the arm unwind information Test: for an arm shared library. Change-Id: I43501ea2eab843b81de8bd5128401dd1971af8d3
90 lines
2.8 KiB
C++
90 lines
2.8 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_ELF_INTERFACE_ARM_H
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#define _LIBUNWINDSTACK_ELF_INTERFACE_ARM_H
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#include <elf.h>
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#include <stdint.h>
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#include <iterator>
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#include <unordered_map>
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#include "ElfInterface.h"
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#include "Memory.h"
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class ElfInterfaceArm : public ElfInterface32 {
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public:
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ElfInterfaceArm(Memory* memory) : ElfInterface32(memory) {}
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virtual ~ElfInterfaceArm() = default;
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class iterator : public std::iterator<std::bidirectional_iterator_tag, uint32_t> {
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public:
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iterator(ElfInterfaceArm* interface, size_t index) : interface_(interface), index_(index) { }
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iterator& operator++() { index_++; return *this; }
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iterator& operator++(int increment) { index_ += increment; return *this; }
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iterator& operator--() { index_--; return *this; }
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iterator& operator--(int decrement) { index_ -= decrement; return *this; }
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bool operator==(const iterator& rhs) { return this->index_ == rhs.index_; }
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bool operator!=(const iterator& rhs) { return this->index_ != rhs.index_; }
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uint32_t operator*() {
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uint32_t addr = interface_->addrs_[index_];
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if (addr == 0) {
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if (!interface_->GetPrel31Addr(interface_->start_offset_ + index_ * 8, &addr)) {
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return 0;
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}
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interface_->addrs_[index_] = addr;
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}
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return addr;
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}
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private:
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ElfInterfaceArm* interface_ = nullptr;
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size_t index_ = 0;
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};
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iterator begin() { return iterator(this, 0); }
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iterator end() { return iterator(this, total_entries_); }
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bool GetPrel31Addr(uint32_t offset, uint32_t* addr);
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bool FindEntry(uint32_t pc, uint64_t* entry_offset);
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bool HandleType(uint64_t offset, uint32_t type) override;
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bool Step(uint64_t pc, Regs* regs, Memory* process_memory) override;
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bool StepExidx(uint64_t pc, Regs* regs, Memory* process_memory);
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uint64_t start_offset() { return start_offset_; }
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void set_start_offset(uint64_t start_offset) { start_offset_ = start_offset; }
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size_t total_entries() { return total_entries_; }
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void set_total_entries(size_t total_entries) { total_entries_ = total_entries; }
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private:
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uint64_t start_offset_ = 0;
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size_t total_entries_ = 0;
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std::unordered_map<size_t, uint32_t> addrs_;
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};
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#endif // _LIBUNWINDSTACK_ELF_INTERFACE_ARM_H
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