132 lines
4.3 KiB
C++
132 lines
4.3 KiB
C++
/*
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* Copyright (C) 2013 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 <stdint.h>
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#include <ucontext.h>
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#include <memory>
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#include <string>
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#define UNW_LOCAL_ONLY
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#include <libunwind.h>
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#include <backtrace/Backtrace.h>
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#include "BacktraceLog.h"
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#include "UnwindCurrent.h"
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std::string UnwindCurrent::GetFunctionNameRaw(uintptr_t pc, uintptr_t* offset) {
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*offset = 0;
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char buf[512];
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unw_word_t value;
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if (unw_get_proc_name_by_ip(unw_local_addr_space, pc, buf, sizeof(buf),
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&value, &context_) >= 0 && buf[0] != '\0') {
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*offset = static_cast<uintptr_t>(value);
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return buf;
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}
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return "";
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}
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void UnwindCurrent::GetUnwContextFromUcontext(const ucontext_t* ucontext) {
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unw_tdep_context_t* unw_context = reinterpret_cast<unw_tdep_context_t*>(&context_);
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#if defined(__arm__)
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unw_context->regs[0] = ucontext->uc_mcontext.arm_r0;
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unw_context->regs[1] = ucontext->uc_mcontext.arm_r1;
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unw_context->regs[2] = ucontext->uc_mcontext.arm_r2;
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unw_context->regs[3] = ucontext->uc_mcontext.arm_r3;
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unw_context->regs[4] = ucontext->uc_mcontext.arm_r4;
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unw_context->regs[5] = ucontext->uc_mcontext.arm_r5;
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unw_context->regs[6] = ucontext->uc_mcontext.arm_r6;
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unw_context->regs[7] = ucontext->uc_mcontext.arm_r7;
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unw_context->regs[8] = ucontext->uc_mcontext.arm_r8;
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unw_context->regs[9] = ucontext->uc_mcontext.arm_r9;
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unw_context->regs[10] = ucontext->uc_mcontext.arm_r10;
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unw_context->regs[11] = ucontext->uc_mcontext.arm_fp;
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unw_context->regs[12] = ucontext->uc_mcontext.arm_ip;
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unw_context->regs[13] = ucontext->uc_mcontext.arm_sp;
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unw_context->regs[14] = ucontext->uc_mcontext.arm_lr;
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unw_context->regs[15] = ucontext->uc_mcontext.arm_pc;
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#else
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unw_context->uc_mcontext = ucontext->uc_mcontext;
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#endif
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}
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bool UnwindCurrent::UnwindFromContext(size_t num_ignore_frames, ucontext_t* ucontext) {
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if (ucontext == nullptr) {
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int ret = unw_getcontext(&context_);
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if (ret < 0) {
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BACK_LOGW("unw_getcontext failed %d", ret);
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return false;
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}
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} else {
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GetUnwContextFromUcontext(ucontext);
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}
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// The cursor structure is pretty large, do not put it on the stack.
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std::unique_ptr<unw_cursor_t> cursor(new unw_cursor_t);
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int ret = unw_init_local(cursor.get(), &context_);
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if (ret < 0) {
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BACK_LOGW("unw_init_local failed %d", ret);
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return false;
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}
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size_t num_frames = 0;
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do {
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unw_word_t pc;
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ret = unw_get_reg(cursor.get(), UNW_REG_IP, &pc);
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if (ret < 0) {
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BACK_LOGW("Failed to read IP %d", ret);
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break;
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}
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unw_word_t sp;
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ret = unw_get_reg(cursor.get(), UNW_REG_SP, &sp);
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if (ret < 0) {
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BACK_LOGW("Failed to read SP %d", ret);
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break;
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}
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frames_.resize(num_frames+1);
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backtrace_frame_data_t* frame = &frames_.at(num_frames);
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frame->num = num_frames;
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frame->pc = static_cast<uintptr_t>(pc);
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frame->sp = static_cast<uintptr_t>(sp);
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frame->stack_size = 0;
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FillInMap(frame->pc, &frame->map);
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// Check to see if we should skip this frame because it's coming
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// from within the library, and we are doing a local unwind.
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if (ucontext != nullptr || num_frames != 0 || !DiscardFrame(*frame)) {
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if (num_ignore_frames == 0) {
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// GetFunctionName is an expensive call, only do it if we are
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// keeping the frame.
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frame->func_name = GetFunctionName(frame->pc, &frame->func_offset);
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if (num_frames > 0) {
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// Set the stack size for the previous frame.
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backtrace_frame_data_t* prev = &frames_.at(num_frames-1);
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prev->stack_size = frame->sp - prev->sp;
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}
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num_frames++;
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} else {
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num_ignore_frames--;
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}
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}
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ret = unw_step (cursor.get());
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} while (ret > 0 && num_frames < MAX_BACKTRACE_FRAMES);
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return true;
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}
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