256 lines
7.2 KiB
C
256 lines
7.2 KiB
C
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/*
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* Copyright (C) 2016 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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#ifndef _LIBUNWINDSTACK_DWARF_CFA_H
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#define _LIBUNWINDSTACK_DWARF_CFA_H
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#include <stdint.h>
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#include <stack>
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#include <string>
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#include <type_traits>
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#include <vector>
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#include "DwarfError.h"
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#include "DwarfLocation.h"
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#include "DwarfMemory.h"
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#include "DwarfStructs.h"
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// DWARF Standard home: http://dwarfstd.org/
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// This code is based on DWARF 4: http://http://dwarfstd.org/doc/DWARF4.pdf
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// See section 6.4.2.1 for a description of the DW_CFA_xxx values.
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class DwarfCfaInfo {
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public:
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enum DisplayType : uint8_t {
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DWARF_DISPLAY_NONE = 0,
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DWARF_DISPLAY_REGISTER,
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DWARF_DISPLAY_NUMBER,
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DWARF_DISPLAY_SIGNED_NUMBER,
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DWARF_DISPLAY_EVAL_BLOCK,
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DWARF_DISPLAY_ADDRESS,
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DWARF_DISPLAY_SET_LOC,
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DWARF_DISPLAY_ADVANCE_LOC,
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};
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struct Info {
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const char* name;
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uint8_t supported_version;
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uint8_t num_operands;
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uint8_t operands[2];
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uint8_t display_operands[2];
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};
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const static Info kTable[64];
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};
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template <typename AddressType>
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class DwarfCfa {
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// Signed version of AddressType
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typedef typename std::make_signed<AddressType>::type SignedType;
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public:
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DwarfCfa(DwarfMemory* memory, const DwarfFDE* fde) : memory_(memory), fde_(fde) {}
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virtual ~DwarfCfa() = default;
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bool GetLocationInfo(uint64_t pc, uint64_t start_offset, uint64_t end_offset,
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dwarf_loc_regs_t* loc_regs);
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bool Log(uint32_t indent, uint64_t pc, uint64_t load_bias, uint64_t start_offset,
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uint64_t end_offset);
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DwarfError last_error() { return last_error_; }
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AddressType cur_pc() { return cur_pc_; }
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void set_cie_loc_regs(const dwarf_loc_regs_t* cie_loc_regs) { cie_loc_regs_ = cie_loc_regs; }
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protected:
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std::string GetOperandString(uint8_t operand, uint64_t value, uint64_t* cur_pc);
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bool LogOffsetRegisterString(uint32_t indent, uint64_t cfa_offset, uint8_t reg);
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bool LogInstruction(uint32_t indent, uint64_t cfa_offset, uint8_t op, uint64_t* cur_pc);
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private:
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DwarfError last_error_;
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DwarfMemory* memory_;
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const DwarfFDE* fde_;
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AddressType cur_pc_;
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const dwarf_loc_regs_t* cie_loc_regs_ = nullptr;
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std::vector<AddressType> operands_;
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std::stack<dwarf_loc_regs_t> loc_reg_state_;
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// CFA processing functions.
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bool cfa_nop(dwarf_loc_regs_t*);
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bool cfa_set_loc(dwarf_loc_regs_t*);
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bool cfa_advance_loc(dwarf_loc_regs_t*);
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bool cfa_offset(dwarf_loc_regs_t*);
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bool cfa_restore(dwarf_loc_regs_t*);
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bool cfa_undefined(dwarf_loc_regs_t*);
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bool cfa_same_value(dwarf_loc_regs_t*);
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bool cfa_register(dwarf_loc_regs_t*);
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bool cfa_remember_state(dwarf_loc_regs_t*);
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bool cfa_restore_state(dwarf_loc_regs_t*);
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bool cfa_def_cfa(dwarf_loc_regs_t*);
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bool cfa_def_cfa_register(dwarf_loc_regs_t*);
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bool cfa_def_cfa_offset(dwarf_loc_regs_t*);
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bool cfa_def_cfa_expression(dwarf_loc_regs_t*);
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bool cfa_expression(dwarf_loc_regs_t*);
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bool cfa_offset_extended_sf(dwarf_loc_regs_t*);
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bool cfa_def_cfa_sf(dwarf_loc_regs_t*);
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bool cfa_def_cfa_offset_sf(dwarf_loc_regs_t*);
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bool cfa_val_offset(dwarf_loc_regs_t*);
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bool cfa_val_offset_sf(dwarf_loc_regs_t*);
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bool cfa_val_expression(dwarf_loc_regs_t*);
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bool cfa_gnu_negative_offset_extended(dwarf_loc_regs_t*);
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using process_func = bool (DwarfCfa::*)(dwarf_loc_regs_t*);
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constexpr static process_func kCallbackTable[64] = {
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// 0x00 DW_CFA_nop
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&DwarfCfa::cfa_nop,
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// 0x01 DW_CFA_set_loc
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&DwarfCfa::cfa_set_loc,
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// 0x02 DW_CFA_advance_loc1
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&DwarfCfa::cfa_advance_loc,
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// 0x03 DW_CFA_advance_loc2
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&DwarfCfa::cfa_advance_loc,
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// 0x04 DW_CFA_advance_loc4
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&DwarfCfa::cfa_advance_loc,
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// 0x05 DW_CFA_offset_extended
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&DwarfCfa::cfa_offset,
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// 0x06 DW_CFA_restore_extended
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&DwarfCfa::cfa_restore,
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// 0x07 DW_CFA_undefined
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&DwarfCfa::cfa_undefined,
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// 0x08 DW_CFA_same_value
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&DwarfCfa::cfa_same_value,
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// 0x09 DW_CFA_register
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&DwarfCfa::cfa_register,
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// 0x0a DW_CFA_remember_state
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&DwarfCfa::cfa_remember_state,
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// 0x0b DW_CFA_restore_state
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&DwarfCfa::cfa_restore_state,
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// 0x0c DW_CFA_def_cfa
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&DwarfCfa::cfa_def_cfa,
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// 0x0d DW_CFA_def_cfa_register
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&DwarfCfa::cfa_def_cfa_register,
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// 0x0e DW_CFA_def_cfa_offset
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&DwarfCfa::cfa_def_cfa_offset,
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// 0x0f DW_CFA_def_cfa_expression
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&DwarfCfa::cfa_def_cfa_expression,
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// 0x10 DW_CFA_expression
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&DwarfCfa::cfa_expression,
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// 0x11 DW_CFA_offset_extended_sf
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&DwarfCfa::cfa_offset_extended_sf,
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// 0x12 DW_CFA_def_cfa_sf
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&DwarfCfa::cfa_def_cfa_sf,
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// 0x13 DW_CFA_def_cfa_offset_sf
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&DwarfCfa::cfa_def_cfa_offset_sf,
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// 0x14 DW_CFA_val_offset
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&DwarfCfa::cfa_val_offset,
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// 0x15 DW_CFA_val_offset_sf
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&DwarfCfa::cfa_val_offset_sf,
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// 0x16 DW_CFA_val_expression
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&DwarfCfa::cfa_val_expression,
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// 0x17 illegal cfa
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nullptr,
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// 0x18 illegal cfa
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nullptr,
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// 0x19 illegal cfa
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nullptr,
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// 0x1a illegal cfa
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nullptr,
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// 0x1b illegal cfa
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nullptr,
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// 0x1c DW_CFA_lo_user (Treat this as illegal)
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nullptr,
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// 0x1d illegal cfa
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nullptr,
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// 0x1e illegal cfa
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nullptr,
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// 0x1f illegal cfa
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nullptr,
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// 0x20 illegal cfa
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nullptr,
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// 0x21 illegal cfa
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nullptr,
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// 0x22 illegal cfa
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nullptr,
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// 0x23 illegal cfa
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nullptr,
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// 0x24 illegal cfa
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nullptr,
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// 0x25 illegal cfa
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nullptr,
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// 0x26 illegal cfa
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nullptr,
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// 0x27 illegal cfa
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nullptr,
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// 0x28 illegal cfa
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nullptr,
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// 0x29 illegal cfa
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nullptr,
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// 0x2a illegal cfa
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nullptr,
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// 0x2b illegal cfa
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nullptr,
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// 0x2c illegal cfa
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nullptr,
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// 0x2d DW_CFA_GNU_window_save (Treat this as illegal)
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nullptr,
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// 0x2e DW_CFA_GNU_args_size
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&DwarfCfa::cfa_nop,
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// 0x2f DW_CFA_GNU_negative_offset_extended
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&DwarfCfa::cfa_gnu_negative_offset_extended,
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// 0x30 illegal cfa
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nullptr,
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// 0x31 illegal cfa
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nullptr,
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// 0x32 illegal cfa
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nullptr,
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// 0x33 illegal cfa
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nullptr,
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// 0x34 illegal cfa
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nullptr,
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// 0x35 illegal cfa
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nullptr,
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// 0x36 illegal cfa
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nullptr,
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// 0x37 illegal cfa
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nullptr,
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// 0x38 illegal cfa
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nullptr,
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// 0x39 illegal cfa
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nullptr,
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// 0x3a illegal cfa
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nullptr,
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// 0x3b illegal cfa
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nullptr,
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// 0x3c illegal cfa
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nullptr,
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// 0x3d illegal cfa
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nullptr,
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// 0x3e illegal cfa
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nullptr,
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// 0x3f DW_CFA_hi_user (Treat this as illegal)
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nullptr,
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};
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};
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#endif // _LIBUNWINDSTACK_DWARF_CFA_H
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