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gerrit-public.fairphone.software / platform / system / core / 9837d6be1fc95d0f9cdb4a13fb7c267d67ec055b / . / libunwindstack / RegsArm64.cpp
blob: 2077bc5fff930407d074ee0dc68ff3a990f7ad5c [file] [log] [blame]
Christopher Ferrisd06001d2017-11-30 18:56:01 -0800[diff] [blame]1/*
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#include <stdint.h>
18
19#include <functional>
20
21#include <unwindstack/Elf.h>
22#include <unwindstack/MapInfo.h>
23#include <unwindstack/Memory.h>
24#include <unwindstack/RegsArm64.h>
25
26#include "MachineArm64.h"
27#include "UcontextArm64.h"
28#include "UserArm64.h"
29
30namespace unwindstack {
31
32RegsArm64::RegsArm64()
33 : RegsImpl<uint64_t>(ARM64_REG_LAST, ARM64_REG_SP, Location(LOCATION_REGISTER, ARM64_REG_LR)) {}
34
35ArchEnum RegsArm64::Arch() {
36 return ARCH_ARM64;
37}
38
39uint64_t RegsArm64::GetAdjustedPc(uint64_t rel_pc, Elf* elf) {
40 if (!elf->valid()) {
41 return rel_pc;
42 }
43
44 if (rel_pc < 4) {
45 return rel_pc;
46 }
47 return rel_pc - 4;
48}
49
50void RegsArm64::SetFromRaw() {
51 set_pc(regs_[ARM64_REG_PC]);
52 set_sp(regs_[ARM64_REG_SP]);
53}
54
55bool RegsArm64::SetPcFromReturnAddress(Memory*) {
56 if (pc() == regs_[ARM64_REG_LR]) {
57 return false;
58 }
59
60 set_pc(regs_[ARM64_REG_LR]);
61 return true;
62}
63
64void RegsArm64::IterateRegisters(std::function<void(const char*, uint64_t)> fn) {
65 fn("x0", regs_[ARM64_REG_R0]);
66 fn("x1", regs_[ARM64_REG_R1]);
67 fn("x2", regs_[ARM64_REG_R2]);
68 fn("x3", regs_[ARM64_REG_R3]);
69 fn("x4", regs_[ARM64_REG_R4]);
70 fn("x5", regs_[ARM64_REG_R5]);
71 fn("x6", regs_[ARM64_REG_R6]);
72 fn("x7", regs_[ARM64_REG_R7]);
73 fn("x8", regs_[ARM64_REG_R8]);
74 fn("x9", regs_[ARM64_REG_R9]);
75 fn("x10", regs_[ARM64_REG_R10]);
76 fn("x11", regs_[ARM64_REG_R11]);
77 fn("x12", regs_[ARM64_REG_R12]);
78 fn("x13", regs_[ARM64_REG_R13]);
79 fn("x14", regs_[ARM64_REG_R14]);
80 fn("x15", regs_[ARM64_REG_R15]);
81 fn("x16", regs_[ARM64_REG_R16]);
82 fn("x17", regs_[ARM64_REG_R17]);
83 fn("x18", regs_[ARM64_REG_R18]);
84 fn("x19", regs_[ARM64_REG_R19]);
85 fn("x20", regs_[ARM64_REG_R20]);
86 fn("x21", regs_[ARM64_REG_R21]);
87 fn("x22", regs_[ARM64_REG_R22]);
88 fn("x23", regs_[ARM64_REG_R23]);
89 fn("x24", regs_[ARM64_REG_R24]);
90 fn("x25", regs_[ARM64_REG_R25]);
91 fn("x26", regs_[ARM64_REG_R26]);
92 fn("x27", regs_[ARM64_REG_R27]);
93 fn("x28", regs_[ARM64_REG_R28]);
94 fn("x29", regs_[ARM64_REG_R29]);
95 fn("sp", regs_[ARM64_REG_SP]);
96 fn("lr", regs_[ARM64_REG_LR]);
97 fn("pc", regs_[ARM64_REG_PC]);
98}
99
100Regs* RegsArm64::Read(void* remote_data) {
101 arm64_user_regs* user = reinterpret_cast<arm64_user_regs*>(remote_data);
102
103 RegsArm64* regs = new RegsArm64();
104 memcpy(regs->RawData(), &user->regs[0], (ARM64_REG_R31 + 1) * sizeof(uint64_t));
105 uint64_t* reg_data = reinterpret_cast<uint64_t*>(regs->RawData());
106 reg_data[ARM64_REG_PC] = user->pc;
107 reg_data[ARM64_REG_SP] = user->sp;
108 regs->SetFromRaw();
109 return regs;
110}
111
112Regs* RegsArm64::CreateFromUcontext(void* ucontext) {
113 arm64_ucontext_t* arm64_ucontext = reinterpret_cast<arm64_ucontext_t*>(ucontext);
114
115 RegsArm64* regs = new RegsArm64();
116 memcpy(regs->RawData(), &arm64_ucontext->uc_mcontext.regs[0], ARM64_REG_LAST * sizeof(uint64_t));
117 regs->SetFromRaw();
118 return regs;
119}
120
121bool RegsArm64::StepIfSignalHandler(uint64_t rel_pc, Elf* elf, Memory* process_memory) {
122 uint64_t data;
123 Memory* elf_memory = elf->memory();
124 // Read from elf memory since it is usually more expensive to read from
125 // process memory.
126 if (!elf_memory->ReadFully(rel_pc, &data, sizeof(data))) {
127 return false;
128 }
129
130 // Look for the kernel sigreturn function.
131 // __kernel_rt_sigreturn:
132 // 0xd2801168 mov x8, #0x8b
133 // 0xd4000001 svc #0x0
134 if (data != 0xd4000001d2801168ULL) {
135 return false;
136 }
137
138 // SP + sizeof(siginfo_t) + uc_mcontext offset + X0 offset.
139 if (!process_memory->ReadFully(sp() + 0x80 + 0xb0 + 0x08, regs_.data(),
140 sizeof(uint64_t) * ARM64_REG_LAST)) {
141 return false;
142 }
143
144 SetFromRaw();
145 return true;
146}
147
148} // namespace unwindstack