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Christopher Ferris723cf9b2017-01-19 20:08:48 -08001/*
2 * Copyright (C) 2016 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef _LIBUNWINDSTACK_ARM_EXIDX_H
18#define _LIBUNWINDSTACK_ARM_EXIDX_H
19
20#include <stdint.h>
21
22#include <deque>
23
Christopher Ferrisd226a512017-07-14 10:37:19 -070024namespace unwindstack {
25
Christopher Ferris3958f802017-02-01 15:44:40 -080026// Forward declarations.
27class Memory;
28class RegsArm;
Christopher Ferris723cf9b2017-01-19 20:08:48 -080029
30enum ArmStatus : size_t {
31 ARM_STATUS_NONE = 0,
32 ARM_STATUS_NO_UNWIND,
33 ARM_STATUS_FINISH,
34 ARM_STATUS_RESERVED,
35 ARM_STATUS_SPARE,
36 ARM_STATUS_TRUNCATED,
37 ARM_STATUS_READ_FAILED,
38 ARM_STATUS_MALFORMED,
39 ARM_STATUS_INVALID_ALIGNMENT,
40 ARM_STATUS_INVALID_PERSONALITY,
41};
42
43enum ArmOp : uint8_t {
44 ARM_OP_FINISH = 0xb0,
45};
46
47class ArmExidx {
48 public:
Christopher Ferris3958f802017-02-01 15:44:40 -080049 ArmExidx(RegsArm* regs, Memory* elf_memory, Memory* process_memory)
Christopher Ferris723cf9b2017-01-19 20:08:48 -080050 : regs_(regs), elf_memory_(elf_memory), process_memory_(process_memory) {}
51 virtual ~ArmExidx() {}
52
53 void LogRawData();
54
55 bool ExtractEntryData(uint32_t entry_offset);
56
57 bool Eval();
58
59 bool Decode();
60
61 std::deque<uint8_t>* data() { return &data_; }
62
63 ArmStatus status() { return status_; }
64
Christopher Ferris3958f802017-02-01 15:44:40 -080065 RegsArm* regs() { return regs_; }
Christopher Ferris723cf9b2017-01-19 20:08:48 -080066
67 uint32_t cfa() { return cfa_; }
68 void set_cfa(uint32_t cfa) { cfa_ = cfa; }
69
Christopher Ferris3958f802017-02-01 15:44:40 -080070 bool pc_set() { return pc_set_; }
71 void set_pc_set(bool pc_set) { pc_set_ = pc_set; }
72
Christopher Ferris723cf9b2017-01-19 20:08:48 -080073 void set_log(bool log) { log_ = log; }
74 void set_log_skip_execution(bool skip_execution) { log_skip_execution_ = skip_execution; }
75 void set_log_indent(uint8_t indent) { log_indent_ = indent; }
76
77 private:
78 bool GetByte(uint8_t* byte);
79
80 bool DecodePrefix_10_00(uint8_t byte);
81 bool DecodePrefix_10_01(uint8_t byte);
82 bool DecodePrefix_10_10(uint8_t byte);
83 bool DecodePrefix_10_11_0000();
84 bool DecodePrefix_10_11_0001();
85 bool DecodePrefix_10_11_0010();
86 bool DecodePrefix_10_11_0011();
87 bool DecodePrefix_10_11_01nn();
88 bool DecodePrefix_10_11_1nnn(uint8_t byte);
89 bool DecodePrefix_10(uint8_t byte);
90
91 bool DecodePrefix_11_000(uint8_t byte);
92 bool DecodePrefix_11_001(uint8_t byte);
93 bool DecodePrefix_11_010(uint8_t byte);
94 bool DecodePrefix_11(uint8_t byte);
95
Christopher Ferris3958f802017-02-01 15:44:40 -080096 RegsArm* regs_ = nullptr;
Christopher Ferris723cf9b2017-01-19 20:08:48 -080097 uint32_t cfa_ = 0;
98 std::deque<uint8_t> data_;
99 ArmStatus status_ = ARM_STATUS_NONE;
100
101 Memory* elf_memory_;
102 Memory* process_memory_;
103
104 bool log_ = false;
105 uint8_t log_indent_ = 0;
106 bool log_skip_execution_ = false;
Christopher Ferris3958f802017-02-01 15:44:40 -0800107 bool pc_set_ = false;
Christopher Ferris723cf9b2017-01-19 20:08:48 -0800108};
109
Christopher Ferrisd226a512017-07-14 10:37:19 -0700110} // namespace unwindstack
111
Christopher Ferris723cf9b2017-01-19 20:08:48 -0800112#endif // _LIBUNWINDSTACK_ARM_EXIDX_H