upload android base code part6
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android/system/extras/simpleperf/dwarf_unwind.cpp
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145
android/system/extras/simpleperf/dwarf_unwind.cpp
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/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "dwarf_unwind.h"
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#include <ucontext.h>
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#include <backtrace/Backtrace.h>
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#include <android-base/logging.h>
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#include "thread_tree.h"
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#define SetUContextReg(dst, perf_regno) \
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do { \
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uint64_t value; \
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if (GetRegValue(regs, perf_regno, &value)) { \
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(dst) = value; \
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} \
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} while (0)
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static ucontext_t BuildUContextFromRegs(const RegSet& regs __attribute__((unused))) {
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ucontext_t ucontext;
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memset(&ucontext, 0, sizeof(ucontext));
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#if defined(__i386__)
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SetUContextReg(ucontext.uc_mcontext.gregs[REG_GS], PERF_REG_X86_GS);
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SetUContextReg(ucontext.uc_mcontext.gregs[REG_FS], PERF_REG_X86_FS);
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SetUContextReg(ucontext.uc_mcontext.gregs[REG_ES], PERF_REG_X86_ES);
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SetUContextReg(ucontext.uc_mcontext.gregs[REG_DS], PERF_REG_X86_DS);
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SetUContextReg(ucontext.uc_mcontext.gregs[REG_EAX], PERF_REG_X86_AX);
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SetUContextReg(ucontext.uc_mcontext.gregs[REG_EBX], PERF_REG_X86_BX);
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SetUContextReg(ucontext.uc_mcontext.gregs[REG_ECX], PERF_REG_X86_CX);
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SetUContextReg(ucontext.uc_mcontext.gregs[REG_EDX], PERF_REG_X86_DX);
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SetUContextReg(ucontext.uc_mcontext.gregs[REG_ESI], PERF_REG_X86_SI);
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SetUContextReg(ucontext.uc_mcontext.gregs[REG_EDI], PERF_REG_X86_DI);
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SetUContextReg(ucontext.uc_mcontext.gregs[REG_EBP], PERF_REG_X86_BP);
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SetUContextReg(ucontext.uc_mcontext.gregs[REG_EIP], PERF_REG_X86_IP);
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SetUContextReg(ucontext.uc_mcontext.gregs[REG_ESP], PERF_REG_X86_SP);
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SetUContextReg(ucontext.uc_mcontext.gregs[REG_CS], PERF_REG_X86_CS);
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SetUContextReg(ucontext.uc_mcontext.gregs[REG_EFL], PERF_REG_X86_FLAGS);
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SetUContextReg(ucontext.uc_mcontext.gregs[REG_SS], PERF_REG_X86_SS);
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#elif defined(__x86_64__)
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SetUContextReg(ucontext.uc_mcontext.gregs[REG_R8], PERF_REG_X86_R8);
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SetUContextReg(ucontext.uc_mcontext.gregs[REG_R9], PERF_REG_X86_R9);
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SetUContextReg(ucontext.uc_mcontext.gregs[REG_R10], PERF_REG_X86_R10);
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SetUContextReg(ucontext.uc_mcontext.gregs[REG_R11], PERF_REG_X86_R11);
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SetUContextReg(ucontext.uc_mcontext.gregs[REG_R12], PERF_REG_X86_R12);
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SetUContextReg(ucontext.uc_mcontext.gregs[REG_R13], PERF_REG_X86_R13);
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SetUContextReg(ucontext.uc_mcontext.gregs[REG_R14], PERF_REG_X86_R14);
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SetUContextReg(ucontext.uc_mcontext.gregs[REG_R15], PERF_REG_X86_R15);
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SetUContextReg(ucontext.uc_mcontext.gregs[REG_RDI], PERF_REG_X86_DI);
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SetUContextReg(ucontext.uc_mcontext.gregs[REG_RSI], PERF_REG_X86_SI);
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SetUContextReg(ucontext.uc_mcontext.gregs[REG_RBP], PERF_REG_X86_BP);
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SetUContextReg(ucontext.uc_mcontext.gregs[REG_RBX], PERF_REG_X86_BX);
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SetUContextReg(ucontext.uc_mcontext.gregs[REG_RDX], PERF_REG_X86_DX);
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SetUContextReg(ucontext.uc_mcontext.gregs[REG_RAX], PERF_REG_X86_AX);
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SetUContextReg(ucontext.uc_mcontext.gregs[REG_RCX], PERF_REG_X86_CX);
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SetUContextReg(ucontext.uc_mcontext.gregs[REG_RSP], PERF_REG_X86_SP);
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SetUContextReg(ucontext.uc_mcontext.gregs[REG_RIP], PERF_REG_X86_IP);
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#elif defined(__aarch64__)
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for (size_t i = PERF_REG_ARM64_X0; i < PERF_REG_ARM64_MAX; ++i) {
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SetUContextReg(ucontext.uc_mcontext.regs[i], i);
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}
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#elif defined(__arm__)
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SetUContextReg(ucontext.uc_mcontext.arm_r0, PERF_REG_ARM_R0);
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SetUContextReg(ucontext.uc_mcontext.arm_r1, PERF_REG_ARM_R1);
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SetUContextReg(ucontext.uc_mcontext.arm_r2, PERF_REG_ARM_R2);
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SetUContextReg(ucontext.uc_mcontext.arm_r3, PERF_REG_ARM_R3);
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SetUContextReg(ucontext.uc_mcontext.arm_r4, PERF_REG_ARM_R4);
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SetUContextReg(ucontext.uc_mcontext.arm_r5, PERF_REG_ARM_R5);
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SetUContextReg(ucontext.uc_mcontext.arm_r6, PERF_REG_ARM_R6);
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SetUContextReg(ucontext.uc_mcontext.arm_r7, PERF_REG_ARM_R7);
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SetUContextReg(ucontext.uc_mcontext.arm_r8, PERF_REG_ARM_R8);
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SetUContextReg(ucontext.uc_mcontext.arm_r9, PERF_REG_ARM_R9);
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SetUContextReg(ucontext.uc_mcontext.arm_r10, PERF_REG_ARM_R10);
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SetUContextReg(ucontext.uc_mcontext.arm_fp, PERF_REG_ARM_FP);
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SetUContextReg(ucontext.uc_mcontext.arm_ip, PERF_REG_ARM_IP);
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SetUContextReg(ucontext.uc_mcontext.arm_sp, PERF_REG_ARM_SP);
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SetUContextReg(ucontext.uc_mcontext.arm_lr, PERF_REG_ARM_LR);
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SetUContextReg(ucontext.uc_mcontext.arm_pc, PERF_REG_ARM_PC);
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#endif
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return ucontext;
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}
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std::vector<uint64_t> UnwindCallChain(int abi, const ThreadEntry& thread,
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const RegSet& regs, const char* stack,
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size_t stack_size, bool strict_arch_check) {
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std::vector<uint64_t> result;
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ArchType arch = (abi != PERF_SAMPLE_REGS_ABI_32) ?
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ScopedCurrentArch::GetCurrentArch() :
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ScopedCurrentArch::GetCurrentArch32();
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if (!IsArchTheSame(arch, GetBuildArch(), strict_arch_check)) {
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LOG(FATAL) << "simpleperf is built in arch " << GetArchString(GetBuildArch())
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<< ", and can't do stack unwinding for arch " << GetArchString(arch);
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return result;
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}
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uint64_t sp_reg_value;
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if (!GetSpRegValue(regs, arch, &sp_reg_value)) {
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LOG(ERROR) << "can't get sp reg value";
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return result;
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}
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uint64_t stack_addr = sp_reg_value;
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std::vector<backtrace_map_t> bt_maps(thread.maps->size());
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size_t map_index = 0;
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for (auto& map : *thread.maps) {
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backtrace_map_t& bt_map = bt_maps[map_index++];
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bt_map.start = map->start_addr;
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bt_map.end = map->start_addr + map->len;
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bt_map.offset = map->pgoff;
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bt_map.name = map->dso->GetDebugFilePath();
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}
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std::unique_ptr<BacktraceMap> backtrace_map(BacktraceMap::Create(thread.pid, bt_maps));
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backtrace_stackinfo_t stack_info;
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stack_info.start = stack_addr;
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stack_info.end = stack_addr + stack_size;
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stack_info.data = reinterpret_cast<const uint8_t*>(stack);
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std::unique_ptr<Backtrace> backtrace(
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Backtrace::CreateOffline(thread.pid, thread.tid, backtrace_map.get(), stack_info, true));
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ucontext_t ucontext = BuildUContextFromRegs(regs);
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if (backtrace->Unwind(0, &ucontext)) {
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for (auto it = backtrace->begin(); it != backtrace->end(); ++it) {
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// Unwinding in arm architecture can return 0 pc address.
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if (it->pc == 0) {
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break;
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}
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result.push_back(it->pc);
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}
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}
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return result;
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}
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