mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
synced 2024-09-13 09:24:08 -07:00
681 lines
18 KiB
C++
681 lines
18 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include <stdexcept>
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#include <list>
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#include <vector>
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#include <cstring>
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#include <iostream>
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#include <fstream>
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#include <algorithm>
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#include <elf.h>
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#include <asm/byteorder.h>
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// Technically, __*_to_cpu and __cpu_to* function are equivalent,
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// so swap can use either of both.
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#define def_swap(endian, type, bits) \
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static inline type ## bits ## _t swap(type ## bits ## _t i) { \
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return __ ## endian ## bits ## _to_cpu(i); \
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}
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class little_endian {
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public:
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def_swap(le, uint, 16);
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def_swap(le, uint, 32);
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def_swap(le, uint, 64);
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def_swap(le, int, 16);
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def_swap(le, int, 32);
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def_swap(le, int, 64);
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};
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class big_endian {
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public:
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def_swap(be, uint, 16);
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def_swap(be, uint, 32);
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def_swap(be, uint, 64);
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def_swap(be, int, 16);
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def_swap(be, int, 32);
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def_swap(be, int, 64);
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};
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// forward declaration
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class ElfSection;
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class ElfSegment;
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// TODO: Rename Elf_* types
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class Elf_Ehdr;
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class Elf_Phdr;
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class Elf;
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class ElfDynamic_Section;
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class ElfStrtab_Section;
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class Elf_Ehdr_Traits {
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public:
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typedef Elf32_Ehdr Type32;
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typedef Elf64_Ehdr Type64;
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template <class endian, typename R, typename T>
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static void swap(T &t, R &r);
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};
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class Elf_Phdr_Traits {
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public:
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typedef Elf32_Phdr Type32;
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typedef Elf64_Phdr Type64;
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template <class endian, typename R, typename T>
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static void swap(T &t, R &r);
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};
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class Elf_Shdr_Traits {
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public:
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typedef Elf32_Shdr Type32;
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typedef Elf64_Shdr Type64;
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template <class endian, typename R, typename T>
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static void swap(T &t, R &r);
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};
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class Elf_Dyn_Traits {
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public:
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typedef Elf32_Dyn Type32;
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typedef Elf64_Dyn Type64;
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template <class endian, typename R, typename T>
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static void swap(T &t, R &r);
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};
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class Elf_Sym_Traits {
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public:
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typedef Elf32_Sym Type32;
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typedef Elf64_Sym Type64;
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template <class endian, typename R, typename T>
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static void swap(T &t, R &r);
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};
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class Elf_Rel_Traits {
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public:
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typedef Elf32_Rel Type32;
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typedef Elf64_Rel Type64;
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template <class endian, typename R, typename T>
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static void swap(T &t, R &r);
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};
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class Elf_Rela_Traits {
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public:
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typedef Elf32_Rela Type32;
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typedef Elf64_Rela Type64;
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template <class endian, typename R, typename T>
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static void swap(T &t, R &r);
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};
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class ElfValue {
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public:
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virtual unsigned int getValue() { return 0; }
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virtual ElfSection *getSection() { return NULL; }
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};
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class ElfPlainValue: public ElfValue {
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unsigned int value;
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public:
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ElfPlainValue(unsigned int val): value(val) {};
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unsigned int getValue() { return value; }
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};
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class ElfLocation: public ElfValue {
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ElfSection *section;
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unsigned int offset;
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public:
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enum position { ABSOLUTE, RELATIVE };
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ElfLocation(): section(NULL), offset(0) {};
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ElfLocation(ElfSection *section, unsigned int off, enum position pos = RELATIVE);
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ElfLocation(unsigned int location, Elf *elf);
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unsigned int getValue();
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ElfSection *getSection() { return section; }
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const char *getBuffer();
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};
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class ElfSize: public ElfValue {
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ElfSection *section;
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public:
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ElfSize(ElfSection *s): section(s) {};
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unsigned int getValue();
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ElfSection *getSection() { return section; }
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};
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class ElfEntSize: public ElfValue {
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ElfSection *section;
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public:
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ElfEntSize(ElfSection *s): section(s) {};
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unsigned int getValue();
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ElfSection *getSection() { return section; }
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};
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template <typename T>
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class serializable: public T::Type32 {
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public:
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serializable() {};
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serializable(const typename T::Type32 &p): T::Type32(p) {};
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private:
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template <typename R>
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void init(const char *buf, size_t len, char ei_data)
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{
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R e;
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assert(len >= sizeof(e));
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memcpy(&e, buf, sizeof(e));
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if (ei_data == ELFDATA2LSB) {
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T::template swap<little_endian>(e, *this);
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return;
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} else if (ei_data == ELFDATA2MSB) {
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T::template swap<big_endian>(e, *this);
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return;
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}
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throw std::runtime_error("Unsupported ELF data encoding");
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}
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template <typename R>
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void serialize(const char *buf, size_t len, char ei_data)
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{
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assert(len >= sizeof(R));
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if (ei_data == ELFDATA2LSB) {
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T::template swap<little_endian>(*this, *(R *)buf);
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return;
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} else if (ei_data == ELFDATA2MSB) {
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T::template swap<big_endian>(*this, *(R *)buf);
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return;
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}
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throw std::runtime_error("Unsupported ELF data encoding");
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}
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public:
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serializable(const char *buf, size_t len, char ei_class, char ei_data)
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{
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if (ei_class == ELFCLASS32) {
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init<typename T::Type32>(buf, len, ei_data);
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return;
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} else if (ei_class == ELFCLASS64) {
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init<typename T::Type64>(buf, len, ei_data);
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return;
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}
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throw std::runtime_error("Unsupported ELF class");
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}
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serializable(std::ifstream &file, char ei_class, char ei_data)
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{
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if (ei_class == ELFCLASS32) {
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typename T::Type32 e;
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file.read((char *)&e, sizeof(e));
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init<typename T::Type32>((char *)&e, sizeof(e), ei_data);
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return;
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} else if (ei_class == ELFCLASS64) {
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typename T::Type64 e;
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file.read((char *)&e, sizeof(e));
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init<typename T::Type64>((char *)&e, sizeof(e), ei_data);
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return;
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}
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throw std::runtime_error("Unsupported ELF class or data encoding");
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}
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void serialize(std::ofstream &file, char ei_class, char ei_data)
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{
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if (ei_class == ELFCLASS32) {
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typename T::Type32 e;
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serialize<typename T::Type32>((char *)&e, sizeof(e), ei_data);
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file.write((char *)&e, sizeof(e));
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return;
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} else if (ei_class == ELFCLASS64) {
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typename T::Type64 e;
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serialize<typename T::Type64>((char *)&e, sizeof(e), ei_data);
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file.write((char *)&e, sizeof(e));
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return;
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}
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throw std::runtime_error("Unsupported ELF class or data encoding");
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}
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void serialize(char *buf, size_t len, char ei_class, char ei_data)
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{
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if (ei_class == ELFCLASS32) {
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serialize<typename T::Type32>(buf, len, ei_data);
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return;
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} else if (ei_class == ELFCLASS64) {
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serialize<typename T::Type64>(buf, len, ei_data);
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return;
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}
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throw std::runtime_error("Unsupported ELF class");
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}
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static inline unsigned int size(char ei_class)
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{
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if (ei_class == ELFCLASS32)
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return sizeof(typename T::Type32);
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else if (ei_class == ELFCLASS64)
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return sizeof(typename T::Type64);
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return 0;
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}
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};
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typedef serializable<Elf_Shdr_Traits> Elf_Shdr;
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class Elf {
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public:
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Elf(std::ifstream &file);
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~Elf();
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/* index == -1 is treated as index == ehdr.e_shstrndx */
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ElfSection *getSection(int index);
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ElfSection *getSectionAt(unsigned int offset);
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ElfSegment *getSegmentByType(unsigned int type);
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ElfDynamic_Section *getDynSection();
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void normalize();
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void write(std::ofstream &file);
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char getClass();
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char getData();
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char getType();
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char getMachine();
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unsigned int getSize();
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private:
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Elf_Ehdr *ehdr;
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ElfLocation eh_entry;
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ElfStrtab_Section *eh_shstrndx;
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ElfSection **sections;
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std::vector<ElfSegment *> segments;
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ElfSection *shdr_section, *phdr_section;
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/* Values used only during initialization */
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Elf_Shdr **tmp_shdr;
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std::ifstream *tmp_file;
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};
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class ElfSection {
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public:
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typedef union {
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ElfSection *section;
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int index;
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} SectionInfo;
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ElfSection(Elf_Shdr &s, std::ifstream *file, Elf *parent);
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virtual ~ElfSection() {
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delete[] data;
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}
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const char *getName() { return name; }
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unsigned int getType() { return shdr.sh_type; }
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unsigned int getFlags() { return shdr.sh_flags; }
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unsigned int getAddr();
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unsigned int getSize() { return shdr.sh_size; }
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unsigned int getAddrAlign() { return shdr.sh_addralign; }
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unsigned int getEntSize() { return shdr.sh_entsize; }
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const char *getData() { return data; }
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ElfSection *getLink() { return link; }
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SectionInfo getInfo() { return info; }
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void shrink(unsigned int newsize) {
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if (newsize < shdr.sh_size) {
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shdr.sh_size = newsize;
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if (next)
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next->markDirty();
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}
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}
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unsigned int getOffset();
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int getIndex();
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Elf_Shdr &getShdr();
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ElfSection *getNext() { return next; }
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ElfSection *getPrevious() { return previous; }
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virtual bool isRelocatable() {
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return ((getType() == SHT_SYMTAB) ||
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(getType() == SHT_STRTAB) ||
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(getType() == SHT_RELA) ||
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(getType() == SHT_HASH) ||
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(getType() == SHT_NOTE) ||
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(getType() == SHT_REL) ||
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(getType() == SHT_DYNSYM) ||
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(getType() == SHT_GNU_HASH) ||
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(getType() == SHT_GNU_verdef) ||
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(getType() == SHT_GNU_verneed) ||
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(getType() == SHT_GNU_versym) ||
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isInSegmentType(PT_INTERP)) &&
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(getFlags() & SHF_ALLOC);
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}
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void insertAfter(ElfSection *section, bool dirty = true) {
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if (previous != NULL)
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previous->next = next;
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if (next != NULL)
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next->previous = previous;
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previous = section;
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if (section != NULL) {
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next = section->next;
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section->next = this;
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} else
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next = NULL;
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if (next != NULL)
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next->previous = this;
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if (dirty)
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markDirty();
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}
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void insertBefore(ElfSection *section, bool dirty = true) {
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if (previous != NULL)
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previous->next = next;
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if (next != NULL)
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next->previous = previous;
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next = section;
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if (section != NULL) {
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previous = section->previous;
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section->previous = this;
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} else
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previous = NULL;
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if (previous != NULL)
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previous->next = this;
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if (dirty)
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markDirty();
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}
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void markDirty() {
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if (link != NULL)
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shdr.sh_link = -1;
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if (info.index)
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shdr.sh_info = -1;
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shdr.sh_offset = -1;
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if (isRelocatable())
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shdr.sh_addr = -1;
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if (next)
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next->markDirty();
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}
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virtual void serialize(std::ofstream &file, char ei_class, char ei_data)
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{
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if (getType() == SHT_NOBITS)
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return;
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file.seekp(getOffset());
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file.write(data, getSize());
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}
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private:
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friend class ElfSegment;
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void addToSegment(ElfSegment *segment) {
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segments.push_back(segment);
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}
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void removeFromSegment(ElfSegment *segment) {
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std::vector<ElfSegment *>::iterator i = std::find(segments.begin(), segments.end(), segment);
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segments.erase(i, i + 1);
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}
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bool isInSegmentType(unsigned int type);
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protected:
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Elf_Shdr shdr;
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char *data;
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const char *name;
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private:
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ElfSection *link;
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SectionInfo info;
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ElfSection *next, *previous;
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int index;
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std::vector<ElfSegment *> segments;
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};
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class ElfSegment {
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public:
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ElfSegment(Elf_Phdr *phdr);
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unsigned int getType() { return type; }
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unsigned int getFlags() { return flags; }
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unsigned int getAlign() { return align; }
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ElfSection *getFirstSection() { return sections.empty() ? NULL : sections.front(); }
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int getVPDiff() { return v_p_diff; }
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unsigned int getFileSize();
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unsigned int getMemSize();
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unsigned int getOffset();
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unsigned int getAddr();
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void addSection(ElfSection *section);
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std::list<ElfSection *>::iterator begin() { return sections.begin(); }
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std::list<ElfSection *>::iterator end() { return sections.end(); }
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ElfSegment *splitBefore(ElfSection *section);
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private:
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unsigned int type;
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int v_p_diff; // Difference between physical and virtual address
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unsigned int flags;
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unsigned int align;
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std::list<ElfSection *> sections;
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// The following are only really used for PT_GNU_RELRO until something
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// better is found.
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unsigned int vaddr;
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unsigned int filesz, memsz;
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};
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class Elf_Ehdr: public serializable<Elf_Ehdr_Traits>, public ElfSection {
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public:
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Elf_Ehdr(std::ifstream &file, char ei_class, char ei_data);
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void serialize(std::ofstream &file, char ei_class, char ei_data)
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{
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serializable<Elf_Ehdr_Traits>::serialize(file, ei_class, ei_data);
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}
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};
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class Elf_Phdr: public serializable<Elf_Phdr_Traits> {
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public:
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Elf_Phdr() {};
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Elf_Phdr(std::ifstream &file, char ei_class, char ei_data)
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: serializable<Elf_Phdr_Traits>(file, ei_class, ei_data) {};
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bool contains(ElfSection *section)
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{
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unsigned int size = section->getSize();
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unsigned int addr = section->getAddr();
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// This may be biased, but should work in most cases
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if ((section->getFlags() & SHF_ALLOC) == 0)
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return false;
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// Special case for PT_DYNAMIC. Eventually, this should
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// be better handled than special cases
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if ((p_type == PT_DYNAMIC) && (section->getType() != SHT_DYNAMIC))
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return false;
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// Special case for PT_TLS.
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if ((p_type == PT_TLS) && !(section->getFlags() & SHF_TLS))
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return false;
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return (addr >= p_vaddr) &&
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(addr + size <= p_vaddr + p_memsz);
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}
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};
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typedef serializable<Elf_Dyn_Traits> Elf_Dyn;
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struct Elf_DynValue {
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unsigned int tag;
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ElfValue *value;
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};
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class ElfDynamic_Section: public ElfSection {
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public:
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ElfDynamic_Section(Elf_Shdr &s, std::ifstream *file, Elf *parent);
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~ElfDynamic_Section();
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void serialize(std::ofstream &file, char ei_class, char ei_data);
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ElfValue *getValueForType(unsigned int tag);
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ElfSection *getSectionForType(unsigned int tag);
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bool setValueForType(unsigned int tag, ElfValue *val);
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private:
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std::vector<Elf_DynValue> dyns;
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};
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typedef serializable<Elf_Sym_Traits> Elf_Sym;
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struct Elf_SymValue {
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const char *name;
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unsigned char info;
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unsigned char other;
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ElfLocation value;
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unsigned int size;
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bool defined;
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};
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#define STT(type) (1 << STT_ ##type)
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class ElfSymtab_Section: public ElfSection {
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public:
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ElfSymtab_Section(Elf_Shdr &s, std::ifstream *file, Elf *parent);
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void serialize(std::ofstream &file, char ei_class, char ei_data);
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Elf_SymValue *lookup(const char *name, unsigned int type_filter = STT(OBJECT) | STT(FUNC));
|
|
|
|
//private: // Until we have a real API
|
|
std::vector<Elf_SymValue> syms;
|
|
};
|
|
|
|
class Elf_Rel: public serializable<Elf_Rel_Traits> {
|
|
public:
|
|
Elf_Rel(std::ifstream &file, char ei_class, char ei_data)
|
|
: serializable<Elf_Rel_Traits>(file, ei_class, ei_data) {};
|
|
|
|
static const unsigned int sh_type = SHT_REL;
|
|
static const unsigned int d_tag = DT_REL;
|
|
static const unsigned int d_tag_count = DT_RELCOUNT;
|
|
};
|
|
|
|
class Elf_Rela: public serializable<Elf_Rela_Traits> {
|
|
public:
|
|
Elf_Rela(std::ifstream &file, char ei_class, char ei_data)
|
|
: serializable<Elf_Rela_Traits>(file, ei_class, ei_data) {};
|
|
|
|
static const unsigned int sh_type = SHT_RELA;
|
|
static const unsigned int d_tag = DT_RELA;
|
|
static const unsigned int d_tag_count = DT_RELACOUNT;
|
|
};
|
|
|
|
template <class Rel>
|
|
class ElfRel_Section: public ElfSection {
|
|
public:
|
|
ElfRel_Section(Elf_Shdr &s, std::ifstream *file, Elf *parent)
|
|
: ElfSection(s, file, parent)
|
|
{
|
|
int pos = file->tellg();
|
|
file->seekg(shdr.sh_offset);
|
|
for (unsigned int i = 0; i < s.sh_size / s.sh_entsize; i++) {
|
|
Rel r(*file, parent->getClass(), parent->getData());
|
|
rels.push_back(r);
|
|
}
|
|
file->seekg(pos);
|
|
}
|
|
|
|
void serialize(std::ofstream &file, char ei_class, char ei_data)
|
|
{
|
|
for (typename std::vector<Rel>::iterator i = rels.begin();
|
|
i != rels.end(); ++i)
|
|
(*i).serialize(file, ei_class, ei_data);
|
|
}
|
|
//private: // Until we have a real API
|
|
std::vector<Rel> rels;
|
|
};
|
|
|
|
class ElfStrtab_Section: public ElfSection {
|
|
public:
|
|
ElfStrtab_Section(Elf_Shdr &s, std::ifstream *file, Elf *parent)
|
|
: ElfSection(s, file, parent)
|
|
{
|
|
table.push_back(table_storage(data, shdr.sh_size));
|
|
}
|
|
|
|
~ElfStrtab_Section()
|
|
{
|
|
for (std::vector<table_storage>::iterator t = table.begin() + 1;
|
|
t != table.end(); t++)
|
|
delete[] t->buf;
|
|
}
|
|
|
|
const char *getStr(unsigned int index);
|
|
|
|
const char *getStr(const char *string);
|
|
|
|
unsigned int getStrIndex(const char *string);
|
|
|
|
void serialize(std::ofstream &file, char ei_class, char ei_data);
|
|
private:
|
|
struct table_storage {
|
|
unsigned int size, used;
|
|
char *buf;
|
|
|
|
table_storage(): size(4096), used(0), buf(new char[4096]) {}
|
|
table_storage(const char *data, unsigned int sz)
|
|
: size(sz), used(sz), buf(const_cast<char *>(data)) {}
|
|
};
|
|
std::vector<table_storage> table;
|
|
};
|
|
|
|
inline char Elf::getClass() {
|
|
return ehdr->e_ident[EI_CLASS];
|
|
}
|
|
|
|
inline char Elf::getData() {
|
|
return ehdr->e_ident[EI_DATA];
|
|
}
|
|
|
|
inline char Elf::getType() {
|
|
return ehdr->e_type;
|
|
}
|
|
|
|
inline char Elf::getMachine() {
|
|
return ehdr->e_machine;
|
|
}
|
|
|
|
inline unsigned int Elf::getSize() {
|
|
ElfSection *section;
|
|
for (section = shdr_section /* It's usually not far from the end */;
|
|
section->getNext() != NULL; section = section->getNext());
|
|
return section->getOffset() + section->getSize();
|
|
}
|
|
|
|
inline bool ElfSection::isInSegmentType(unsigned int type) {
|
|
for (std::vector<ElfSegment *>::iterator seg = segments.begin(); seg != segments.end(); seg++)
|
|
if ((*seg)->getType() == type)
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
inline ElfLocation::ElfLocation(ElfSection *section, unsigned int off, enum position pos)
|
|
: section(section) {
|
|
if ((pos == ABSOLUTE) && section)
|
|
offset = off - section->getAddr();
|
|
else
|
|
offset = off;
|
|
}
|
|
|
|
inline ElfLocation::ElfLocation(unsigned int location, Elf *elf) {
|
|
section = elf->getSectionAt(location);
|
|
offset = location - (section ? section->getAddr() : 0);
|
|
}
|
|
|
|
inline unsigned int ElfLocation::getValue() {
|
|
return (section ? section->getAddr() : 0) + offset;
|
|
}
|
|
|
|
inline const char *ElfLocation::getBuffer() {
|
|
return section ? section->getData() + offset : NULL;
|
|
}
|
|
|
|
inline unsigned int ElfSize::getValue() {
|
|
return section->getSize();
|
|
}
|
|
|
|
inline unsigned int ElfEntSize::getValue() {
|
|
return section->getEntSize();
|
|
}
|