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/*
* 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.
*/
#ifndef _LIBBACKTRACE_UNWIND_OFFLINE_H
#define _LIBBACKTRACE_UNWIND_OFFLINE_H
#include <libunwind.h>
#include <stdint.h>
#include <sys/types.h>
#include <ucontext.h>
#include <unordered_map>
#include <unordered_set>
#include <backtrace/Backtrace.h>
struct Space {
uint64_t start;
uint64_t end;
const uint8_t* data;
Space() { Clear(); }
void Clear();
size_t Read(uint64_t addr, uint8_t* buffer, size_t size);
};
struct DebugFrameInfo;
class BacktraceOffline : public Backtrace {
public:
BacktraceOffline(pid_t pid, pid_t tid, BacktraceMap* map, const backtrace_stackinfo_t& stack,
bool cache_file)
: Backtrace(pid, tid, map),
cache_file_(cache_file),
context_(nullptr),
is_debug_frame_used_(false) {
stack_space_.start = stack.start;
stack_space_.end = stack.end;
stack_space_.data = stack.data;
}
virtual ~BacktraceOffline() = default;
bool Unwind(size_t num_ignore_frames, ucontext_t* context) override;
bool ReadWord(uint64_t ptr, word_t* out_value) override;
size_t Read(uint64_t addr, uint8_t* buffer, size_t bytes) override;
bool FindProcInfo(unw_addr_space_t addr_space, uint64_t ip, unw_proc_info_t* proc_info,
int need_unwind_info);
bool ReadReg(size_t reg_index, uint64_t* value);
protected:
std::string GetFunctionNameRaw(uint64_t pc, uint64_t* offset) override;
DebugFrameInfo* GetDebugFrameInFile(const std::string& filename);
bool cache_file_;
ucontext_t* context_;
Space eh_frame_hdr_space_;
Space eh_frame_space_;
Space arm_extab_space_;
Space arm_exidx_space_;
Space stack_space_;
// is_debug_frame_used_ is to make sure we can try both .debug_frame and .ARM.exidx in
// FindProcInfo() on ARM. One example is EsxContext::Clear() in
// vendor/lib/egl/libGLESv2_adreno.so. EsxContext::Clear() appears in both .debug_frame and
// .ARM.exidx. However, libunwind fails to execute debug_frame instruction
// "DW_CFA_offset_extended: r265 at cfa-48". So we need to try .ARM.exidx to unwind that
// function.
bool is_debug_frame_used_;
};
#endif // _LIBBACKTRACE_BACKTRACE_OFFLINE_H
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