4cc36d2b43
It turns out that for the dwarf information, if a FDE indicates it's pc relative, then pc has to be incremented by the load bias. If not, then it should not be incremented. Previously, the code always subtracted load bias values from pcs, and assumed that all fdes were incremented by load bias values. The new code actually reads the fdes and adjusted the pcs in the fde and in the eh frame hdr so that load bias values are already handled properly. In addition, add dumping of arm exidx values in unwind_reg_info. This allowed verifying that the debug frame in those elf files was being handled properly. Added a new unit test that only has a debug frame that has a non-zero load bias and has fde entries that do not have pc relative encoding. Fix a couple of other small bugs. Bug: 109824792 Test: All libbacktrace/libunwindstack unit tests pass. Test: Ran ART 137-cfi test and 004-ThreadStress. Test: Verify that displaying the fde start and end pc actually match the Test: real data for fde that have pc relative set, and that don't. Test: Verified that the unwind information for arm exidx matches the Test: debug frame data. Change-Id: I707555286b5cb05df9f25489e8c5ede753cfe0fb
126 lines
3.2 KiB
C++
126 lines
3.2 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_ARM_EXIDX_H
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#define _LIBUNWINDSTACK_ARM_EXIDX_H
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#include <stdint.h>
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#include <deque>
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#include <map>
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namespace unwindstack {
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// Forward declarations.
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class Memory;
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class RegsArm;
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enum ArmStatus : size_t {
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ARM_STATUS_NONE = 0,
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ARM_STATUS_NO_UNWIND,
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ARM_STATUS_FINISH,
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ARM_STATUS_RESERVED,
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ARM_STATUS_SPARE,
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ARM_STATUS_TRUNCATED,
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ARM_STATUS_READ_FAILED,
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ARM_STATUS_MALFORMED,
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ARM_STATUS_INVALID_ALIGNMENT,
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ARM_STATUS_INVALID_PERSONALITY,
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};
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enum ArmOp : uint8_t {
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ARM_OP_FINISH = 0xb0,
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};
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enum ArmLogType : uint8_t {
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ARM_LOG_NONE,
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ARM_LOG_FULL,
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ARM_LOG_BY_REG,
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};
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class ArmExidx {
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public:
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ArmExidx(RegsArm* regs, Memory* elf_memory, Memory* process_memory)
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: regs_(regs), elf_memory_(elf_memory), process_memory_(process_memory) {}
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virtual ~ArmExidx() {}
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void LogRawData();
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void LogByReg();
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bool ExtractEntryData(uint32_t entry_offset);
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bool Eval();
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bool Decode();
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std::deque<uint8_t>* data() { return &data_; }
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ArmStatus status() { return status_; }
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uint64_t status_address() { return status_address_; }
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RegsArm* regs() { return regs_; }
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uint32_t cfa() { return cfa_; }
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void set_cfa(uint32_t cfa) { cfa_ = cfa; }
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bool pc_set() { return pc_set_; }
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void set_pc_set(bool pc_set) { pc_set_ = pc_set; }
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void set_log(ArmLogType log_type) { log_type_ = log_type; }
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void set_log_skip_execution(bool skip_execution) { log_skip_execution_ = skip_execution; }
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void set_log_indent(uint8_t indent) { log_indent_ = indent; }
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private:
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bool GetByte(uint8_t* byte);
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void AdjustRegisters(int32_t offset);
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bool DecodePrefix_10_00(uint8_t byte);
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bool DecodePrefix_10_01(uint8_t byte);
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bool DecodePrefix_10_10(uint8_t byte);
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bool DecodePrefix_10_11_0000();
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bool DecodePrefix_10_11_0001();
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bool DecodePrefix_10_11_0010();
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bool DecodePrefix_10_11_0011();
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bool DecodePrefix_10_11_01nn();
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bool DecodePrefix_10_11_1nnn(uint8_t byte);
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bool DecodePrefix_10(uint8_t byte);
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bool DecodePrefix_11_000(uint8_t byte);
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bool DecodePrefix_11_001(uint8_t byte);
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bool DecodePrefix_11_010(uint8_t byte);
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bool DecodePrefix_11(uint8_t byte);
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RegsArm* regs_ = nullptr;
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uint32_t cfa_ = 0;
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std::deque<uint8_t> data_;
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ArmStatus status_ = ARM_STATUS_NONE;
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uint64_t status_address_ = 0;
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Memory* elf_memory_;
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Memory* process_memory_;
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ArmLogType log_type_ = ARM_LOG_NONE;
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uint8_t log_indent_ = 0;
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bool log_skip_execution_ = false;
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bool pc_set_ = false;
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int32_t log_cfa_offset_ = 0;
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std::map<uint8_t, int32_t> log_regs_;
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};
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} // namespace unwindstack
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#endif // _LIBUNWINDSTACK_ARM_EXIDX_H
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