mirror of
https://github.com/classilla/tenfourfox.git
synced 2024-09-10 11:54:40 +00:00
242 lines
4.9 KiB
C++
242 lines
4.9 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
|
|
* You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
#ifndef Elfxx_h
|
|
#define Elfxx_h
|
|
|
|
/**
|
|
* Android system headers have two different elf.h file. The one under linux/
|
|
* is the most complete on older android API versions.
|
|
*/
|
|
#if defined(ANDROID) && __ANDROID_API__ < 21
|
|
#include <linux/elf.h>
|
|
#else
|
|
#include <elf.h>
|
|
#endif
|
|
#include <endian.h>
|
|
|
|
#if defined(__ARM_EABI__) && !defined(PT_ARM_EXIDX)
|
|
#define PT_ARM_EXIDX 0x70000001
|
|
#endif
|
|
|
|
/**
|
|
* Generic ELF macros for the target system
|
|
*/
|
|
#ifdef __LP64__
|
|
#define Elf_(type) Elf64_ ## type
|
|
#define ELFCLASS ELFCLASS64
|
|
#define ELF_R_TYPE ELF64_R_TYPE
|
|
#define ELF_R_SYM ELF64_R_SYM
|
|
#ifndef ELF_ST_BIND
|
|
#define ELF_ST_BIND ELF64_ST_BIND
|
|
#endif
|
|
#else
|
|
#define Elf_(type) Elf32_ ## type
|
|
#define ELFCLASS ELFCLASS32
|
|
#define ELF_R_TYPE ELF32_R_TYPE
|
|
#define ELF_R_SYM ELF32_R_SYM
|
|
#ifndef ELF_ST_BIND
|
|
#define ELF_ST_BIND ELF32_ST_BIND
|
|
#endif
|
|
#endif
|
|
|
|
#ifndef __BYTE_ORDER
|
|
#error Cannot find endianness
|
|
#endif
|
|
|
|
#if __BYTE_ORDER == __LITTLE_ENDIAN
|
|
#define ELFDATA ELFDATA2LSB
|
|
#elif __BYTE_ORDER == __BIG_ENDIAN
|
|
#define ELFDATA ELFDATA2MSB
|
|
#endif
|
|
|
|
#ifdef __linux__
|
|
#define ELFOSABI ELFOSABI_LINUX
|
|
#ifdef EI_ABIVERSION
|
|
#define ELFABIVERSION 0
|
|
#endif
|
|
#else
|
|
#error Unknown ELF OSABI
|
|
#endif
|
|
|
|
#if defined(__i386__)
|
|
#define ELFMACHINE EM_386
|
|
|
|
// Doing this way probably doesn't scale to other architectures
|
|
#define R_ABS R_386_32
|
|
#define R_GLOB_DAT R_386_GLOB_DAT
|
|
#define R_JMP_SLOT R_386_JMP_SLOT
|
|
#define R_RELATIVE R_386_RELATIVE
|
|
#define RELOC(n) DT_REL ## n
|
|
#define UNSUPPORTED_RELOC(n) DT_RELA ## n
|
|
#define STR_RELOC(n) "DT_REL" # n
|
|
#define Reloc Rel
|
|
|
|
#elif defined(__x86_64__)
|
|
#define ELFMACHINE EM_X86_64
|
|
|
|
#define R_ABS R_X86_64_64
|
|
#define R_GLOB_DAT R_X86_64_GLOB_DAT
|
|
#define R_JMP_SLOT R_X86_64_JUMP_SLOT
|
|
#define R_RELATIVE R_X86_64_RELATIVE
|
|
#define RELOC(n) DT_RELA ## n
|
|
#define UNSUPPORTED_RELOC(n) DT_REL ## n
|
|
#define STR_RELOC(n) "DT_RELA" # n
|
|
#define Reloc Rela
|
|
|
|
#elif defined(__arm__)
|
|
#define ELFMACHINE EM_ARM
|
|
|
|
#ifndef R_ARM_ABS32
|
|
#define R_ARM_ABS32 2
|
|
#endif
|
|
#ifndef R_ARM_GLOB_DAT
|
|
#define R_ARM_GLOB_DAT 21
|
|
#endif
|
|
#ifndef R_ARM_JUMP_SLOT
|
|
#define R_ARM_JUMP_SLOT 22
|
|
#endif
|
|
#ifndef R_ARM_RELATIVE
|
|
#define R_ARM_RELATIVE 23
|
|
#endif
|
|
|
|
#define R_ABS R_ARM_ABS32
|
|
#define R_GLOB_DAT R_ARM_GLOB_DAT
|
|
#define R_JMP_SLOT R_ARM_JUMP_SLOT
|
|
#define R_RELATIVE R_ARM_RELATIVE
|
|
#define RELOC(n) DT_REL ## n
|
|
#define UNSUPPORTED_RELOC(n) DT_RELA ## n
|
|
#define STR_RELOC(n) "DT_REL" # n
|
|
#define Reloc Rel
|
|
|
|
#else
|
|
#error Unknown ELF machine type
|
|
#endif
|
|
|
|
/**
|
|
* Android system headers don't have all definitions
|
|
*/
|
|
#ifndef STN_UNDEF
|
|
#define STN_UNDEF 0
|
|
#endif
|
|
#ifndef DT_INIT_ARRAY
|
|
#define DT_INIT_ARRAY 25
|
|
#endif
|
|
#ifndef DT_FINI_ARRAY
|
|
#define DT_FINI_ARRAY 26
|
|
#endif
|
|
#ifndef DT_INIT_ARRAYSZ
|
|
#define DT_INIT_ARRAYSZ 27
|
|
#endif
|
|
#ifndef DT_FINI_ARRAYSZ
|
|
#define DT_FINI_ARRAYSZ 28
|
|
#endif
|
|
#ifndef DT_RELACOUNT
|
|
#define DT_RELACOUNT 0x6ffffff9
|
|
#endif
|
|
#ifndef DT_RELCOUNT
|
|
#define DT_RELCOUNT 0x6ffffffa
|
|
#endif
|
|
#ifndef DT_VERSYM
|
|
#define DT_VERSYM 0x6ffffff0
|
|
#endif
|
|
#ifndef DT_VERDEF
|
|
#define DT_VERDEF 0x6ffffffc
|
|
#endif
|
|
#ifndef DT_VERDEFNUM
|
|
#define DT_VERDEFNUM 0x6ffffffd
|
|
#endif
|
|
#ifndef DT_VERNEED
|
|
#define DT_VERNEED 0x6ffffffe
|
|
#endif
|
|
#ifndef DT_VERNEEDNUM
|
|
#define DT_VERNEEDNUM 0x6fffffff
|
|
#endif
|
|
#ifndef DT_FLAGS_1
|
|
#define DT_FLAGS_1 0x6ffffffb
|
|
#endif
|
|
#ifndef DT_FLAGS
|
|
#define DT_FLAGS 30
|
|
#endif
|
|
#ifndef DF_SYMBOLIC
|
|
#define DF_SYMBOLIC 0x00000002
|
|
#endif
|
|
#ifndef DF_TEXTREL
|
|
#define DF_TEXTREL 0x00000004
|
|
#endif
|
|
|
|
namespace Elf {
|
|
|
|
/**
|
|
* Define a few basic Elf Types
|
|
*/
|
|
typedef Elf_(Phdr) Phdr;
|
|
typedef Elf_(Dyn) Dyn;
|
|
typedef Elf_(Sym) Sym;
|
|
typedef Elf_(Addr) Addr;
|
|
typedef Elf_(Word) Word;
|
|
typedef Elf_(Half) Half;
|
|
|
|
/**
|
|
* Helper class around the standard Elf header struct
|
|
*/
|
|
struct Ehdr: public Elf_(Ehdr)
|
|
{
|
|
/**
|
|
* Equivalent to reinterpret_cast<const Ehdr *>(buf), but additionally
|
|
* checking that this is indeed an Elf header and that the Elf type
|
|
* corresponds to that of the system
|
|
*/
|
|
static const Ehdr *validate(const void *buf);
|
|
};
|
|
|
|
/**
|
|
* Elf String table
|
|
*/
|
|
class Strtab: public UnsizedArray<const char>
|
|
{
|
|
public:
|
|
/**
|
|
* Returns the string at the given index in the table
|
|
*/
|
|
const char *GetStringAt(off_t index) const
|
|
{
|
|
return &UnsizedArray<const char>::operator[](index);
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Helper class around Elf relocation.
|
|
*/
|
|
struct Rel: public Elf_(Rel)
|
|
{
|
|
/**
|
|
* Returns the addend for the relocation, which is the value stored
|
|
* at r_offset.
|
|
*/
|
|
Addr GetAddend(void *base) const
|
|
{
|
|
return *(reinterpret_cast<const Addr *>(
|
|
reinterpret_cast<const char *>(base) + r_offset));
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Helper class around Elf relocation with addend.
|
|
*/
|
|
struct Rela: public Elf_(Rela)
|
|
{
|
|
/**
|
|
* Returns the addend for the relocation.
|
|
*/
|
|
Addr GetAddend(void *base) const
|
|
{
|
|
return r_addend;
|
|
}
|
|
};
|
|
|
|
} /* namespace Elf */
|
|
|
|
#endif /* Elfxx_h */
|