/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "perf_regs.h"
#include <string.h>
#include <unordered_map>
#include <android-base/logging.h>
#include <android-base/stringprintf.h>
#include <android-base/strings.h>
#include "perf_event.h"
ArchType ScopedCurrentArch::current_arch = ARCH_UNSUPPORTED;
ArchType ScopedCurrentArch::current_arch32 = ARCH_UNSUPPORTED;
ArchType GetArchType(const std::string& arch) {
if (arch == "x86" || arch == "i686") {
return ARCH_X86_32;
} else if (arch == "x86_64") {
return ARCH_X86_64;
} else if (arch == "aarch64") {
return ARCH_ARM64;
} else if (android::base::StartsWith(arch, "arm")) {
// If arch is "armv8l", it is likely that we are using a 32-bit simpleperf
// binary on a aarch64 device. In this case, the profiling environment is
// ARCH_ARM64, because the kernel is aarch64.
if (arch[3] == 'v') {
int version = atoi(&arch[4]);
if (version >= 8) {
return ARCH_ARM64;
}
}
return ARCH_ARM;
}
LOG(ERROR) << "unsupported arch: " << arch;
return ARCH_UNSUPPORTED;
}
ArchType GetArchForAbi(ArchType machine_arch, int abi) {
if (abi == PERF_SAMPLE_REGS_ABI_32) {
if (machine_arch == ARCH_X86_64) {
return ARCH_X86_32;
}
if (machine_arch == ARCH_ARM64) {
return ARCH_ARM;
}
}
return machine_arch;
}
std::string GetArchString(ArchType arch) {
switch (arch) {
case ARCH_X86_32:
return "x86";
case ARCH_X86_64:
return "x86_64";
case ARCH_ARM64:
return "arm64";
case ARCH_ARM:
return "arm";
default:
break;
}
return "unknown";
}
uint64_t GetSupportedRegMask(ArchType arch) {
switch (arch) {
case ARCH_X86_32:
return ((1ULL << PERF_REG_X86_32_MAX) - 1) & ~(1ULL << PERF_REG_X86_DS) &
~(1ULL << PERF_REG_X86_ES) & ~(1ULL << PERF_REG_X86_FS) & ~(1ULL << PERF_REG_X86_GS);
case ARCH_X86_64:
return (((1ULL << PERF_REG_X86_64_MAX) - 1) & ~(1ULL << PERF_REG_X86_DS) &
~(1ULL << PERF_REG_X86_ES) & ~(1ULL << PERF_REG_X86_FS) & ~(1ULL << PERF_REG_X86_GS));
case ARCH_ARM:
return ((1ULL << PERF_REG_ARM_MAX) - 1);
case ARCH_ARM64:
return ((1ULL << PERF_REG_ARM64_MAX) - 1);
default:
return 0;
}
return 0;
}
static std::unordered_map<size_t, std::string> x86_reg_map = {
{PERF_REG_X86_AX, "ax"}, {PERF_REG_X86_BX, "bx"}, {PERF_REG_X86_CX, "cx"},
{PERF_REG_X86_DX, "dx"}, {PERF_REG_X86_SI, "si"}, {PERF_REG_X86_DI, "di"},
{PERF_REG_X86_BP, "bp"}, {PERF_REG_X86_SP, "sp"}, {PERF_REG_X86_IP, "ip"},
{PERF_REG_X86_FLAGS, "flags"}, {PERF_REG_X86_CS, "cs"}, {PERF_REG_X86_SS, "ss"},
{PERF_REG_X86_DS, "ds"}, {PERF_REG_X86_ES, "es"}, {PERF_REG_X86_FS, "fs"},
{PERF_REG_X86_GS, "gs"},
};
static std::unordered_map<size_t, std::string> arm_reg_map = {
{PERF_REG_ARM_FP, "fp"}, {PERF_REG_ARM_IP, "ip"}, {PERF_REG_ARM_SP, "sp"},
{PERF_REG_ARM_LR, "lr"}, {PERF_REG_ARM_PC, "pc"},
};
static std::unordered_map<size_t, std::string> arm64_reg_map = {
{PERF_REG_ARM64_LR, "lr"}, {PERF_REG_ARM64_SP, "sp"}, {PERF_REG_ARM64_PC, "pc"},
};
std::string GetRegName(size_t regno, ArchType arch) {
// Cast regno to int type to avoid -Werror=type-limits.
int reg = static_cast<int>(regno);
switch (arch) {
case ARCH_X86_64: {
if (reg >= PERF_REG_X86_R8 && reg <= PERF_REG_X86_R15) {
return android::base::StringPrintf("r%d", reg - PERF_REG_X86_R8 + 8);
}
} // go through
case ARCH_X86_32: {
auto it = x86_reg_map.find(reg);
CHECK(it != x86_reg_map.end()) << "unknown reg " << reg;
return it->second;
}
case ARCH_ARM: {
if (reg >= PERF_REG_ARM_R0 && reg <= PERF_REG_ARM_R10) {
return android::base::StringPrintf("r%d", reg - PERF_REG_ARM_R0);
}
auto it = arm_reg_map.find(reg);
CHECK(it != arm_reg_map.end()) << "unknown reg " << reg;
return it->second;
}
case ARCH_ARM64: {
if (reg >= PERF_REG_ARM64_X0 && reg <= PERF_REG_ARM64_X29) {
return android::base::StringPrintf("r%d", reg - PERF_REG_ARM64_X0);
}
auto it = arm64_reg_map.find(reg);
CHECK(it != arm64_reg_map.end()) << "unknown reg " << reg;
return it->second;
}
default:
return "unknown";
}
}
RegSet::RegSet(int abi, uint64_t valid_mask, const uint64_t* valid_regs)
: valid_mask(valid_mask) {
arch = (abi == PERF_SAMPLE_REGS_ABI_32) ? ScopedCurrentArch::GetCurrentArch32()
: ScopedCurrentArch::GetCurrentArch();
memset(data, 0, sizeof(data));
for (int i = 0, j = 0; i < 64; ++i) {
if ((valid_mask >> i) & 1) {
data[i] = valid_regs[j++];
}
}
if (ScopedCurrentArch::GetCurrentArch() == ARCH_ARM64 && abi == PERF_SAMPLE_REGS_ABI_32) {
// The kernel dumps arm64 regs, but we need arm regs. So map arm64 regs into arm regs.
data[PERF_REG_ARM_PC] = data[PERF_REG_ARM64_PC];
}
}
bool RegSet::GetRegValue(size_t regno, uint64_t* value) const {
CHECK_LT(regno, 64U);
if ((valid_mask >> regno) & 1) {
*value = data[regno];
return true;
}
return false;
}
bool RegSet::GetSpRegValue(uint64_t* value) const {
size_t regno;
switch (arch) {
case ARCH_X86_32:
regno = PERF_REG_X86_SP;
break;
case ARCH_X86_64:
regno = PERF_REG_X86_SP;
break;
case ARCH_ARM:
regno = PERF_REG_ARM_SP;
break;
case ARCH_ARM64:
regno = PERF_REG_ARM64_SP;
break;
default:
return false;
}
return GetRegValue(regno, value);
}
bool RegSet::GetIpRegValue(uint64_t* value) const {
size_t regno;
switch (arch) {
case ARCH_X86_64:
case ARCH_X86_32:
regno = PERF_REG_X86_IP;
break;
case ARCH_ARM:
regno = PERF_REG_ARM_PC;
break;
case ARCH_ARM64:
regno = PERF_REG_ARM64_PC;
break;
default:
return false;
}
return GetRegValue(regno, value);
}