1 /*
2 * Copyright (C) 2015 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 "perf_regs.h"
18
19 #include <unordered_map>
20 #include <android-base/logging.h>
21 #include <android-base/stringprintf.h>
22 #include <android-base/strings.h>
23
24 #include "perf_event.h"
25
26 ArchType ScopedCurrentArch::current_arch = ARCH_UNSUPPORTED;
27 ArchType ScopedCurrentArch::current_arch32 = ARCH_UNSUPPORTED;
28
GetArchType(const std::string & arch)29 ArchType GetArchType(const std::string& arch) {
30 if (arch == "x86" || arch == "i686") {
31 return ARCH_X86_32;
32 } else if (arch == "x86_64") {
33 return ARCH_X86_64;
34 } else if (arch == "aarch64") {
35 return ARCH_ARM64;
36 } else if (android::base::StartsWith(arch, "arm")) {
37 // If arch is "armv8l", it is likely that we are using a 32-bit simpleperf
38 // binary on a aarch64 device. In this case, the profiling environment is
39 // ARCH_ARM64, because the kernel is aarch64.
40 if (arch[3] == 'v') {
41 int version = atoi(&arch[4]);
42 if (version >= 8) {
43 return ARCH_ARM64;
44 }
45 }
46 return ARCH_ARM;
47 }
48 LOG(ERROR) << "unsupported arch: " << arch;
49 return ARCH_UNSUPPORTED;
50 }
51
GetArchForAbi(ArchType machine_arch,int abi)52 ArchType GetArchForAbi(ArchType machine_arch, int abi) {
53 if (abi == PERF_SAMPLE_REGS_ABI_32) {
54 if (machine_arch == ARCH_X86_64) {
55 return ARCH_X86_32;
56 }
57 if (machine_arch == ARCH_ARM64) {
58 return ARCH_ARM;
59 }
60 }
61 return machine_arch;
62 }
63
GetArchString(ArchType arch)64 std::string GetArchString(ArchType arch) {
65 switch (arch) {
66 case ARCH_X86_32:
67 return "x86";
68 case ARCH_X86_64:
69 return "x86_64";
70 case ARCH_ARM64:
71 return "arm64";
72 case ARCH_ARM:
73 return "arm";
74 default:
75 break;
76 }
77 return "unknown";
78 }
79
80 // If strict_check, must have arch1 == arch2.
81 // Otherwise, allow X86_32 with X86_64, ARM with ARM64.
IsArchTheSame(ArchType arch1,ArchType arch2,bool strict_check)82 bool IsArchTheSame(ArchType arch1, ArchType arch2, bool strict_check) {
83 if (strict_check) {
84 return arch1 == arch2;
85 }
86 switch (arch1) {
87 case ARCH_X86_32:
88 case ARCH_X86_64:
89 return arch2 == ARCH_X86_32 || arch2 == ARCH_X86_64;
90 case ARCH_ARM64:
91 case ARCH_ARM:
92 return arch2 == ARCH_ARM64 || arch2 == ARCH_ARM;
93 default:
94 break;
95 }
96 return arch1 == arch2;
97 }
98
GetSupportedRegMask(ArchType arch)99 uint64_t GetSupportedRegMask(ArchType arch) {
100 switch (arch) {
101 case ARCH_X86_32:
102 return ((1ULL << PERF_REG_X86_32_MAX) - 1) & ~(1ULL << PERF_REG_X86_DS) &
103 ~(1ULL << PERF_REG_X86_ES) & ~(1ULL << PERF_REG_X86_FS) & ~(1ULL << PERF_REG_X86_GS);
104 case ARCH_X86_64:
105 return (((1ULL << PERF_REG_X86_64_MAX) - 1) & ~(1ULL << PERF_REG_X86_DS) &
106 ~(1ULL << PERF_REG_X86_ES) & ~(1ULL << PERF_REG_X86_FS) & ~(1ULL << PERF_REG_X86_GS));
107 case ARCH_ARM:
108 return ((1ULL << PERF_REG_ARM_MAX) - 1);
109 case ARCH_ARM64:
110 return ((1ULL << PERF_REG_ARM64_MAX) - 1);
111 default:
112 return 0;
113 }
114 return 0;
115 }
116
117 static std::unordered_map<size_t, std::string> x86_reg_map = {
118 {PERF_REG_X86_AX, "ax"}, {PERF_REG_X86_BX, "bx"}, {PERF_REG_X86_CX, "cx"},
119 {PERF_REG_X86_DX, "dx"}, {PERF_REG_X86_SI, "si"}, {PERF_REG_X86_DI, "di"},
120 {PERF_REG_X86_BP, "bp"}, {PERF_REG_X86_SP, "sp"}, {PERF_REG_X86_IP, "ip"},
121 {PERF_REG_X86_FLAGS, "flags"}, {PERF_REG_X86_CS, "cs"}, {PERF_REG_X86_SS, "ss"},
122 {PERF_REG_X86_DS, "ds"}, {PERF_REG_X86_ES, "es"}, {PERF_REG_X86_FS, "fs"},
123 {PERF_REG_X86_GS, "gs"},
124 };
125
126 static std::unordered_map<size_t, std::string> arm_reg_map = {
127 {PERF_REG_ARM_FP, "fp"}, {PERF_REG_ARM_IP, "ip"}, {PERF_REG_ARM_SP, "sp"},
128 {PERF_REG_ARM_LR, "lr"}, {PERF_REG_ARM_PC, "pc"},
129 };
130
131 static std::unordered_map<size_t, std::string> arm64_reg_map = {
132 {PERF_REG_ARM64_LR, "lr"}, {PERF_REG_ARM64_SP, "sp"}, {PERF_REG_ARM64_PC, "pc"},
133 };
134
GetRegName(size_t regno,ArchType arch)135 std::string GetRegName(size_t regno, ArchType arch) {
136 // Cast regno to int type to avoid -Werror=type-limits.
137 int reg = static_cast<int>(regno);
138 switch (arch) {
139 case ARCH_X86_64: {
140 if (reg >= PERF_REG_X86_R8 && reg <= PERF_REG_X86_R15) {
141 return android::base::StringPrintf("r%d", reg - PERF_REG_X86_R8 + 8);
142 }
143 } // go through
144 case ARCH_X86_32: {
145 auto it = x86_reg_map.find(reg);
146 CHECK(it != x86_reg_map.end()) << "unknown reg " << reg;
147 return it->second;
148 }
149 case ARCH_ARM: {
150 if (reg >= PERF_REG_ARM_R0 && reg <= PERF_REG_ARM_R10) {
151 return android::base::StringPrintf("r%d", reg - PERF_REG_ARM_R0);
152 }
153 auto it = arm_reg_map.find(reg);
154 CHECK(it != arm_reg_map.end()) << "unknown reg " << reg;
155 return it->second;
156 }
157 case ARCH_ARM64: {
158 if (reg >= PERF_REG_ARM64_X0 && reg <= PERF_REG_ARM64_X29) {
159 return android::base::StringPrintf("r%d", reg - PERF_REG_ARM64_X0);
160 }
161 auto it = arm64_reg_map.find(reg);
162 CHECK(it != arm64_reg_map.end()) << "unknown reg " << reg;
163 return it->second;
164 }
165 default:
166 return "unknown";
167 }
168 }
169
CreateRegSet(int abi,uint64_t valid_mask,const uint64_t * valid_regs)170 RegSet CreateRegSet(int abi, uint64_t valid_mask, const uint64_t* valid_regs) {
171 RegSet regs;
172 regs.valid_mask = valid_mask;
173 for (int i = 0, j = 0; i < 64; ++i) {
174 if ((valid_mask >> i) & 1) {
175 regs.data[i] = valid_regs[j++];
176 }
177 }
178 if (ScopedCurrentArch::GetCurrentArch() == ARCH_ARM64 &&
179 abi == PERF_SAMPLE_REGS_ABI_32) {
180 // The kernel dumps arm64 regs, but we need arm regs. So map arm64
181 // regs into arm regs.
182 regs.data[PERF_REG_ARM_PC] = regs.data[PERF_REG_ARM64_PC];
183 }
184 return regs;
185 }
186
SetIpReg(ArchType arch,uint64_t ip,RegSet * regs)187 void SetIpReg(ArchType arch, uint64_t ip, RegSet* regs) {
188 int regno;
189 switch (arch) {
190 case ARCH_X86_64:
191 case ARCH_X86_32:
192 regno = PERF_REG_X86_IP;
193 break;
194 case ARCH_ARM:
195 regno = PERF_REG_ARM_PC;
196 break;
197 case ARCH_ARM64:
198 regno = PERF_REG_ARM64_PC;
199 break;
200 default:
201 return;
202 }
203 regs->valid_mask |= (1ULL << regno);
204 regs->data[regno] = ip;
205 }
206
GetRegValue(const RegSet & regs,size_t regno,uint64_t * value)207 bool GetRegValue(const RegSet& regs, size_t regno, uint64_t* value) {
208 CHECK_LT(regno, 64U);
209 if ((regs.valid_mask >> regno) & 1) {
210 *value = regs.data[regno];
211 return true;
212 }
213 return false;
214 }
215
GetSpRegValue(const RegSet & regs,ArchType arch,uint64_t * value)216 bool GetSpRegValue(const RegSet& regs, ArchType arch, uint64_t* value) {
217 size_t regno;
218 switch (arch) {
219 case ARCH_X86_32:
220 regno = PERF_REG_X86_SP;
221 break;
222 case ARCH_X86_64:
223 regno = PERF_REG_X86_SP;
224 break;
225 case ARCH_ARM:
226 regno = PERF_REG_ARM_SP;
227 break;
228 case ARCH_ARM64:
229 regno = PERF_REG_ARM64_SP;
230 break;
231 default:
232 return false;
233 }
234 return GetRegValue(regs, regno, value);
235 }
236