1 /* 2 * Copyright (c) 2023 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 UNWIND_LOC_H 16 #define UNWIND_LOC_H 17 18 #include <cinttypes> 19 #include <string> 20 #include <vector> 21 #include "dfx_regs_qut.h" 22 #include "unwind_define.h" 23 24 namespace OHOS { 25 namespace HiviewDFX { 26 enum RegLocEnum : uint8_t { 27 REG_LOC_UNUSED = 0, // register has same value as in prev. frame 28 REG_LOC_UNDEFINED, // register isn't saved at all 29 REG_LOC_VAL_OFFSET, // register that is the value, cfa = cfa + off 30 REG_LOC_MEM_OFFSET, // register saved at CFA-relative address, cfa = [r14 + off], r14 = [cfa + off] 31 REG_LOC_REGISTER, // register saved in another register, cfa = [r14], pc = [lr] 32 REG_LOC_VAL_EXPRESSION, // register value is expression result, r11 = cfa + expr_result 33 REG_LOC_MEM_EXPRESSION, // register stored in expression result, r11 = [cfa + expr_result] 34 }; 35 36 struct RegLoc { 37 RegLocEnum type = REG_LOC_UNUSED; /* see DWARF_LOC_* macros. */ 38 intptr_t val = 0; 39 }; 40 41 // saved register status after running call frame instructions 42 // it should describe how register saved 43 struct RegLocState { RegLocStateRegLocState44 RegLocState() { locs.resize(DfxRegsQut::GetQutRegsSize()); } RegLocStateRegLocState45 explicit RegLocState(size_t locsSize) { locs.resize(locsSize); } 46 ~RegLocState() = default; 47 48 uintptr_t pcStart = 0; 49 uintptr_t pcEnd = 0; 50 uint32_t cfaReg = 0; // cfa = [r14] 51 union { 52 int32_t cfaRegOffset = 0; // cfa = cfa + offset 53 uintptr_t cfaExprPtr; // cfa = expr 54 }; 55 bool isPcSet = false; 56 uintptr_t pseudoReg = 0; 57 std::vector<RegLoc> locs; 58 }; 59 } // namespace HiviewDFX 60 } // namespace OHOS 61 #endif 62