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Architecture
Core
Crash
Driver
Memory
Time
Video
CPU.cpp
Debugger.cpp
Disk.cpp
InterruptsManager.cpp
Lock.cpp
PeripheralComponentInterconnect.cpp
Power.cpp
README.md
Random.cpp
StackCheck.cpp
Symbols.cpp
SystemManagementBIOS.cpp
UndefinedBehaviorSanitization.c
UniversalAsynchronousReceiverTransmitter.cpp
crashhandler.hpp
smbios.hpp
ubsan.h
Execute
FileSystem
Files
GUI
Library
Network
Profiling
Recovery
SystemCalls
Tasking
Tests
include
include_std
.gitignore
DAPI.hpp
Doxyfile
Fex.hpp
Kernel.cpp
KernelConfig.cpp
KernelThread.cpp
LICENSE
Makefile
README.md
dump.sh
ipc.h
kernel.h
syscalls.h
245 lines
8.6 KiB
C++
245 lines
8.6 KiB
C++
/*
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This file is part of Fennix Kernel.
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Fennix Kernel is free software: you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation, either version 3 of
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the License, or (at your option) any later version.
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Fennix Kernel is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Fennix Kernel. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include <symbols.hpp>
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#include <memory.hpp>
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#include <convert.h>
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#include <debug.h>
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#include <elf.h>
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// #pragma GCC diagnostic ignored "-Wignored-qualifiers"
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namespace SymbolResolver
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{
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const NIF char *Symbols::GetSymbolFromAddress(uintptr_t Address)
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{
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Symbols::SymbolTable Result{0, (char *)"<unknown>"};
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for (int64_t i = 0; i < this->TotalEntries; i++)
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if (this->SymTable[i].Address <= Address && this->SymTable[i].Address > Result.Address)
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Result = this->SymTable[i];
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return Result.FunctionName;
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}
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void Symbols::AddSymbol(uintptr_t Address, const char *Name)
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{
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if (this->TotalEntries >= 0x10000)
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{
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error("Symbol table is full");
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return;
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}
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this->SymTable[this->TotalEntries].Address = Address;
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strcpy(this->SymTable[this->TotalEntries].FunctionName, Name);
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this->TotalEntries++;
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}
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__no_sanitize("alignment") void Symbols::AddBySymbolInfo(uint64_t Num, uint64_t EntSize, uint64_t Shndx, uintptr_t Sections)
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{
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#ifdef a32
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fixme("Function not working on 32-bit");
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return;
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#endif
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if (this->TotalEntries >= 0x10000)
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{
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error("Symbol table is full");
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return;
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}
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#if defined(a64) || defined(aa64)
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Elf64_Shdr *ElfSections = (Elf64_Shdr *)(Sections);
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Elf64_Sym *ElfSymbols = nullptr;
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#elif defined(a32)
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Elf32_Shdr *ElfSections = (Elf32_Shdr *)(Sections);
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Elf32_Sym *ElfSymbols = nullptr;
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#endif
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char *strtab = nullptr;
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for (uint64_t i = 0; i < Num; i++)
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switch (ElfSections[i].sh_type)
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{
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case SHT_SYMTAB:
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#if defined(a64) || defined(aa64)
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ElfSymbols = (Elf64_Sym *)(Sections + ElfSections[i].sh_offset);
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this->TotalEntries = ElfSections[i].sh_size / sizeof(Elf64_Sym);
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#elif defined(a32)
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ElfSymbols = (Elf32_Sym *)(Sections + ElfSections[i].sh_offset);
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this->TotalEntries = ElfSections[i].sh_size / sizeof(Elf32_Sym);
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#endif
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if (this->TotalEntries >= 0x10000)
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this->TotalEntries = 0x10000 - 1;
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debug("Symbol table found, %d entries", this->TotalEntries);
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break;
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case SHT_STRTAB:
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if (Shndx == i)
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{
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debug("String table found, %d entries", ElfSections[i].sh_size);
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}
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else
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{
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strtab = (char *)(Sections + ElfSections[i].sh_offset);
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debug("String table found, %d entries", ElfSections[i].sh_size);
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}
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break;
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default:
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break;
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}
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if (ElfSymbols != nullptr && strtab != nullptr)
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{
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int64_t Index, MinimumIndex;
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for (int64_t i = 0; i < this->TotalEntries - 1; i++)
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{
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MinimumIndex = i;
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for (Index = i + 1; Index < this->TotalEntries; Index++)
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if (ElfSymbols[Index].st_value < ElfSymbols[MinimumIndex].st_value)
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MinimumIndex = Index;
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#if defined(a64) || defined(aa64)
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Elf64_Sym tmp = ElfSymbols[MinimumIndex];
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#elif defined(a32)
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Elf32_Sym tmp = ElfSymbols[MinimumIndex];
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#endif
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ElfSymbols[MinimumIndex] = ElfSymbols[i];
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ElfSymbols[i] = tmp;
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}
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while (ElfSymbols[0].st_value == 0)
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{
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if (this->TotalEntries <= 0)
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break;
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ElfSymbols++;
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this->TotalEntries--;
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}
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if (this->TotalEntries <= 0)
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{
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error("Symbol table is empty");
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return;
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}
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trace("Symbol table loaded, %d entries (%ldKB)", this->TotalEntries, TO_KB(this->TotalEntries * sizeof(SymbolTable)));
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for (int64_t i = 0, g = this->TotalEntries; i < g; i++)
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{
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this->SymTable[i].Address = ElfSymbols[i].st_value;
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this->SymTable[i].FunctionName = &strtab[ElfSymbols[i].st_name];
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// debug("Symbol %d: %#llx %s", i, this->SymTable[i].Address, this->SymTable[i].FunctionName);
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}
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}
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}
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Symbols::Symbols(uintptr_t ImageAddress)
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{
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if (ImageAddress == 0 || Memory::Virtual().Check((void *)ImageAddress) == false)
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{
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error("Invalid image address %#lx", ImageAddress);
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return;
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}
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this->Image = (void *)ImageAddress;
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debug("Solving symbols for address: %#llx", ImageAddress);
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#if defined(a64) || defined(aa64)
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Elf64_Ehdr *Header = (Elf64_Ehdr *)ImageAddress;
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#elif defined(a32)
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Elf32_Ehdr *Header = (Elf32_Ehdr *)ImageAddress;
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#endif
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if (Header->e_ident[0] != 0x7F &&
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Header->e_ident[1] != 'E' &&
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Header->e_ident[2] != 'L' &&
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Header->e_ident[3] != 'F')
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{
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error("Invalid ELF header");
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return;
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}
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#if defined(a64) || defined(aa64)
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Elf64_Shdr *ElfSections = (Elf64_Shdr *)(ImageAddress + Header->e_shoff);
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Elf64_Sym *ElfSymbols = nullptr;
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#elif defined(a32)
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Elf32_Shdr *ElfSections = (Elf32_Shdr *)(ImageAddress + Header->e_shoff);
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Elf32_Sym *ElfSymbols = nullptr;
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#endif
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char *strtab = nullptr;
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for (uint16_t i = 0; i < Header->e_shnum; i++)
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switch (ElfSections[i].sh_type)
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{
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case SHT_SYMTAB:
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#if defined(a64) || defined(aa64)
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ElfSymbols = (Elf64_Sym *)(ImageAddress + ElfSections[i].sh_offset);
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this->TotalEntries = ElfSections[i].sh_size / sizeof(Elf64_Sym);
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#elif defined(a32)
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ElfSymbols = (Elf32_Sym *)(ImageAddress + ElfSections[i].sh_offset);
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this->TotalEntries = ElfSections[i].sh_size / sizeof(Elf32_Sym);
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#endif
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if (this->TotalEntries >= 0x10000)
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this->TotalEntries = 0x10000 - 1;
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debug("Symbol table found, %d entries", this->TotalEntries);
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break;
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case SHT_STRTAB:
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if (Header->e_shstrndx == i)
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{
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debug("String table found, %d entries", ElfSections[i].sh_size);
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}
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else
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{
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strtab = (char *)(ImageAddress + ElfSections[i].sh_offset);
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debug("String table found, %d entries", ElfSections[i].sh_size);
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}
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break;
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default:
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break;
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}
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if (ElfSymbols != nullptr && strtab != nullptr)
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{
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int64_t Index, MinimumIndex;
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for (int64_t i = 0; i < this->TotalEntries - 1; i++)
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{
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MinimumIndex = i;
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for (Index = i + 1; Index < this->TotalEntries; Index++)
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if (ElfSymbols[Index].st_value < ElfSymbols[MinimumIndex].st_value)
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MinimumIndex = Index;
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#if defined(a64) || defined(aa64)
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Elf64_Sym tmp = ElfSymbols[MinimumIndex];
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#elif defined(a32)
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Elf32_Sym tmp = ElfSymbols[MinimumIndex];
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#endif
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ElfSymbols[MinimumIndex] = ElfSymbols[i];
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ElfSymbols[i] = tmp;
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}
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while (ElfSymbols[0].st_value == 0)
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{
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ElfSymbols++;
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this->TotalEntries--;
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}
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trace("Symbol table loaded, %d entries (%ldKB)", this->TotalEntries, TO_KB(this->TotalEntries * sizeof(SymbolTable)));
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for (int64_t i = 0, g = this->TotalEntries; i < g; i++)
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{
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this->SymTable[i].Address = ElfSymbols[i].st_value;
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this->SymTable[i].FunctionName = &strtab[ElfSymbols[i].st_name];
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// debug("Symbol %d: %#llx %s", i, this->SymTable[i].Address, this->SymTable[i].FunctionName);
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}
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}
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}
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Symbols::~Symbols() {}
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}
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