146 lines
4.0 KiB
C++
146 lines
4.0 KiB
C++
/*
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* Copyright (C) 2017 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 <elf.h>
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#include <inttypes.h>
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#include <stdint.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <android-base/stringprintf.h>
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#include <unwindstack/Elf.h>
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#include <unwindstack/MapInfo.h>
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#include <unwindstack/Unwinder.h>
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namespace unwindstack {
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void Unwinder::FillInFrame(MapInfo* map_info, uint64_t* rel_pc) {
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size_t frame_num = frames_.size();
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frames_.resize(frame_num + 1);
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FrameData* frame = &frames_.at(frame_num);
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frame->num = frame_num;
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frame->pc = regs_->pc();
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frame->sp = regs_->sp();
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frame->rel_pc = frame->pc;
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if (map_info == nullptr) {
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return;
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}
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Elf* elf = map_info->GetElf(process_memory_, true);
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*rel_pc = elf->GetRelPc(regs_->pc(), map_info);
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if (frame_num != 0) {
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// Don't adjust the first frame pc.
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frame->rel_pc = regs_->GetAdjustedPc(*rel_pc, elf);
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// Adjust the original pc.
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frame->pc -= *rel_pc - frame->rel_pc;
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} else {
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frame->rel_pc = *rel_pc;
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}
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frame->map_name = map_info->name;
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frame->map_offset = map_info->elf_offset;
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frame->map_start = map_info->start;
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frame->map_end = map_info->end;
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if (!elf->GetFunctionName(frame->rel_pc, &frame->function_name, &frame->function_offset)) {
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frame->function_name = "";
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frame->function_offset = 0;
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}
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}
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void Unwinder::Unwind() {
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frames_.clear();
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bool return_address_attempt = false;
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for (; frames_.size() < max_frames_;) {
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MapInfo* map_info = maps_->Find(regs_->pc());
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uint64_t rel_pc;
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FillInFrame(map_info, &rel_pc);
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bool stepped;
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if (map_info == nullptr) {
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stepped = false;
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} else {
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bool finished;
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stepped = map_info->elf->Step(rel_pc + map_info->elf_offset, regs_, process_memory_.get(),
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&finished);
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if (stepped && finished) {
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break;
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}
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}
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if (!stepped) {
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if (return_address_attempt) {
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// Remove the speculative frame.
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frames_.pop_back();
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break;
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} else {
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// Steping didn't work, try this secondary method.
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if (!regs_->SetPcFromReturnAddress(process_memory_.get())) {
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break;
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}
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return_address_attempt = true;
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}
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} else {
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return_address_attempt = false;
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}
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}
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}
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std::string Unwinder::FormatFrame(size_t frame_num) {
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if (frame_num >= frames_.size()) {
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return "";
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}
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return FormatFrame(frames_[frame_num],
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regs_->MachineType() == EM_ARM || regs_->MachineType() == EM_386);
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}
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std::string Unwinder::FormatFrame(const FrameData& frame, bool bits32) {
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std::string data;
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if (bits32) {
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data += android::base::StringPrintf(" #%02zu pc %08" PRIx64, frame.num, frame.rel_pc);
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} else {
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data += android::base::StringPrintf(" #%02zu pc %016" PRIx64, frame.num, frame.rel_pc);
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}
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if (frame.map_offset != 0) {
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data += android::base::StringPrintf(" (offset 0x%" PRIx64 ")", frame.map_offset);
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}
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if (frame.map_start == frame.map_end) {
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// No valid map associated with this frame.
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data += " <unknown>";
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} else if (!frame.map_name.empty()) {
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data += " " + frame.map_name;
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} else {
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data += android::base::StringPrintf(" <anonymous:%" PRIx64 ">", frame.map_start);
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}
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if (!frame.function_name.empty()) {
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data += " (" + frame.function_name;
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if (frame.function_offset != 0) {
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data += android::base::StringPrintf("+%" PRId64, frame.function_offset);
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}
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data += ')';
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}
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return data;
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}
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} // namespace unwindstack
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