1 /*
2  * Copyright (c) 2024 Huawei Device Co., Ltd.
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at
6  *
7  * http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  */
15 #ifndef FP_UNWINDER_H
16 #define FP_UNWINDER_H
17 #include <cinttypes>
18 #include "dfx_define.h"
19 namespace OHOS {
20 namespace HiviewDFX {
21 class FpUnwinder {
22 public:
23     FpUnwinder();
24     ~FpUnwinder();
GetFpPcRegs(void * regs)25     static inline AT_ALWAYS_INLINE void GetFpPcRegs(void *regs)
26     {
27 #if defined(__aarch64__)
28         asm volatile(
29         "1:\n"
30         "adr x12, 1b\n"
31         "stp x12, x29, [%[base], #0]\n"
32         : [base] "+r"(regs)
33         :
34         : "x12", "memory");
35 #endif
36     }
37     static int32_t Unwind(uintptr_t* pcs, int32_t sz, int32_t skipFrameNum);
38 private:
39     static int32_t UnwindFallback(uintptr_t* pcs, int32_t sz, int32_t skipFrameNum);
40     static void GetStackRange(uintptr_t& stackBottom, uintptr_t& stackTop);
41     static bool ReadUintptrSafe(uintptr_t addr, uintptr_t& value);
42     static void GetMainThreadStackRange();
43     static void GetSignalAltStackRange(uintptr_t& stackBottom, uintptr_t& stackTop);
44 };
45 }
46 } // namespace OHOS
47 #endif