80aba5494a
Pages in .data.rel.ro are always dirty. Move whatever we can to .rodata so that we reduce memory pressure. The size of rodata, text, and data.rel.ro sections of linker64 on cuttlefish before/after this change: rodata: 0x170e4 -> 0x17964 (+2176 bytes) text: 0xec919 -> 0xec919 (no change) data.rel.ro: 0x9cf0 -> 0x98f0 (-1024 bytes) Test: Boot cuttlefish Change-Id: Ib2fd2bb0afb50208d441731d8c31bc8f287272c3
267 lines
7.9 KiB
C++
267 lines
7.9 KiB
C++
/*
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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 <unwindstack/DwarfError.h>
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#include <unwindstack/DwarfLocation.h>
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#include <unwindstack/DwarfMemory.h>
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#include <unwindstack/DwarfStructs.h>
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namespace unwindstack {
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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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// It may seem cleaner to just change the type of 'name' to 'const char *'.
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// However, having a pointer here would require relocation at runtime,
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// causing 'kTable' to be placed in data.rel.ro section instead of rodata
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// section, adding memory pressure to the system. Note that this is only
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// safe because this is only used in C++ code. C++ standard, unlike C
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// standard, mandates the array size to be large enough to hold the NULL
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// terminator when initialized with a string literal.
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const char name[36];
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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 start_offset, uint64_t end_offset);
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const DwarfErrorData& last_error() { return last_error_; }
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DwarfErrorCode LastErrorCode() { return last_error_.code; }
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uint64_t LastErrorAddress() { return last_error_.address; }
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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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DwarfErrorData 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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} // namespace unwindstack
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#endif // _LIBUNWINDSTACK_DWARF_CFA_H
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