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Douglas Leung61b1a1a2017-11-08 10:53:53 +01001/*
2 * Copyright (C) 2017 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>
Christopher Ferris53914162018-02-08 19:27:47 -080022#include <unwindstack/MachineMips.h>
Douglas Leung61b1a1a2017-11-08 10:53:53 +010023#include <unwindstack/MapInfo.h>
24#include <unwindstack/Memory.h>
25#include <unwindstack/RegsMips.h>
Christopher Ferris53914162018-02-08 19:27:47 -080026#include <unwindstack/UcontextMips.h>
27#include <unwindstack/UserMips.h>
Douglas Leung61b1a1a2017-11-08 10:53:53 +010028
29namespace unwindstack {
30
31RegsMips::RegsMips()
32 : RegsImpl<uint32_t>(MIPS_REG_LAST, MIPS_REG_SP, Location(LOCATION_REGISTER, MIPS_REG_RA)) {}
33
34ArchEnum RegsMips::Arch() {
35 return ARCH_MIPS;
36}
37
Christopher Ferrisa2ec50b2018-02-21 15:39:07 -080038uint64_t RegsMips::GetPcAdjustment(uint64_t rel_pc, Elf* elf) {
39 if (!elf->valid() || rel_pc < 8) {
40 return 0;
Douglas Leung61b1a1a2017-11-08 10:53:53 +010041 }
Christopher Ferrisa2ec50b2018-02-21 15:39:07 -080042 // For now, just assume no compact branches
43 return 8;
Douglas Leung61b1a1a2017-11-08 10:53:53 +010044}
45
46void RegsMips::SetFromRaw() {
47 set_pc(regs_[MIPS_REG_PC]);
48 set_sp(regs_[MIPS_REG_SP]);
49}
50
51bool RegsMips::SetPcFromReturnAddress(Memory*) {
52 if (pc() == regs_[MIPS_REG_RA]) {
53 return false;
54 }
55
56 set_pc(regs_[MIPS_REG_RA]);
57 return true;
58}
59
60void RegsMips::IterateRegisters(std::function<void(const char*, uint64_t)> fn) {
61 fn("r0", regs_[MIPS_REG_R0]);
62 fn("r1", regs_[MIPS_REG_R1]);
63 fn("r2", regs_[MIPS_REG_R2]);
64 fn("r3", regs_[MIPS_REG_R3]);
65 fn("r4", regs_[MIPS_REG_R4]);
66 fn("r5", regs_[MIPS_REG_R5]);
67 fn("r6", regs_[MIPS_REG_R6]);
68 fn("r7", regs_[MIPS_REG_R7]);
69 fn("r8", regs_[MIPS_REG_R8]);
70 fn("r9", regs_[MIPS_REG_R9]);
71 fn("r10", regs_[MIPS_REG_R10]);
72 fn("r11", regs_[MIPS_REG_R11]);
73 fn("r12", regs_[MIPS_REG_R12]);
74 fn("r13", regs_[MIPS_REG_R13]);
75 fn("r14", regs_[MIPS_REG_R14]);
76 fn("r15", regs_[MIPS_REG_R15]);
77 fn("r16", regs_[MIPS_REG_R16]);
78 fn("r17", regs_[MIPS_REG_R17]);
79 fn("r18", regs_[MIPS_REG_R18]);
80 fn("r19", regs_[MIPS_REG_R19]);
81 fn("r20", regs_[MIPS_REG_R20]);
82 fn("r21", regs_[MIPS_REG_R21]);
83 fn("r22", regs_[MIPS_REG_R22]);
84 fn("r23", regs_[MIPS_REG_R23]);
85 fn("r24", regs_[MIPS_REG_R24]);
86 fn("r25", regs_[MIPS_REG_R25]);
87 fn("r26", regs_[MIPS_REG_R26]);
88 fn("r27", regs_[MIPS_REG_R27]);
89 fn("r28", regs_[MIPS_REG_R28]);
90 fn("sp", regs_[MIPS_REG_SP]);
91 fn("r30", regs_[MIPS_REG_R30]);
92 fn("ra", regs_[MIPS_REG_RA]);
93 fn("pc", regs_[MIPS_REG_PC]);
94}
95
96Regs* RegsMips::Read(void* remote_data) {
97 mips_user_regs* user = reinterpret_cast<mips_user_regs*>(remote_data);
98 RegsMips* regs = new RegsMips();
99 uint32_t* reg_data = reinterpret_cast<uint32_t*>(regs->RawData());
100
101 memcpy(regs->RawData(), &user->regs[MIPS32_EF_R0], (MIPS_REG_R31 + 1) * sizeof(uint32_t));
102
103 reg_data[MIPS_REG_PC] = user->regs[MIPS32_EF_CP0_EPC];
104 regs->SetFromRaw();
105 return regs;
106}
107
108Regs* RegsMips::CreateFromUcontext(void* ucontext) {
109 mips_ucontext_t* mips_ucontext = reinterpret_cast<mips_ucontext_t*>(ucontext);
110
111 RegsMips* regs = new RegsMips();
112 // Copy 64 bit sc_regs over to 32 bit regs
113 for (int i = 0; i < 32; i++) {
114 (*regs)[MIPS_REG_R0 + i] = mips_ucontext->uc_mcontext.sc_regs[i];
115 }
116 (*regs)[MIPS_REG_PC] = mips_ucontext->uc_mcontext.sc_pc;
117 regs->SetFromRaw();
118 return regs;
119}
120
121bool RegsMips::StepIfSignalHandler(uint64_t rel_pc, Elf* elf, Memory* process_memory) {
122 uint64_t data;
123 uint64_t offset = 0;
124 Memory* elf_memory = elf->memory();
125 // Read from elf memory since it is usually more expensive to read from
126 // process memory.
127 if (!elf_memory->Read(rel_pc, &data, sizeof(data))) {
128 return false;
129 }
130
131 // Look for the kernel sigreturn functions.
132 // __vdso_rt_sigreturn:
133 // 0x24021061 li v0, 0x1061
134 // 0x0000000c syscall
135 // __vdso_sigreturn:
136 // 0x24021017 li v0, 0x1017
137 // 0x0000000c syscall
138 if (data == 0x0000000c24021061ULL) {
139 // vdso_rt_sigreturn => read rt_sigframe
140 // offset = siginfo offset + sizeof(siginfo) + uc_mcontext offset + sc_pc offset
141 offset = 24 + 128 + 24 + 8;
142 } else if (data == 0x0000000c24021017LL) {
143 // vdso_sigreturn => read sigframe
144 // offset = sigcontext offset + sc_pc offset
145 offset = 24 + 8;
146 } else {
147 return false;
148 }
149
150 // read sc_pc and sc_regs[32] from stack
151 uint64_t values[MIPS_REG_LAST];
152 if (!process_memory->Read(sp() + offset, values, sizeof(values))) {
153 return false;
154 }
155
156 // Copy 64 bit sc_pc over to 32 bit regs_[MIPS_REG_PC]
157 regs_[MIPS_REG_PC] = values[0];
158
159 // Copy 64 bit sc_regs over to 32 bit regs
160 for (int i = 0; i < 32; i++) {
161 regs_[MIPS_REG_R0 + i] = values[1 + i];
162 }
163
164 SetFromRaw();
165 return true;
166}
167
168} // namespace unwindstack