Xash3D FWGS engine.
 
 
 
 

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/*
* Copyright (C) 2008 The Android Open Source Project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef _LINKER_H_
#define _LINKER_H_
#ifdef __ANDROID__
#include <unistd.h>
#include <sys/types.h>
// #include <elf.h>
#include <linux/elf.h>
// #include <sys/exec_elf.h>
// #include <link.h>
// a1ba: we don't really need custom linker on Android 64, because
// it's only intended to workaround bug which persist on Android < 4.4
#define Elf_Ehdr Elf32_Ehdr
#define Elf_Phdr Elf32_Phdr
#define Elf_Shdr Elf32_Shdr
#define Elf_Sym Elf32_Sym
#define Elf_Rel Elf32_Rel
#define Elf_RelA Elf32_Rela
#define Elf_Dyn Elf32_Dyn
#define Elf_Half Elf32_Half
#define Elf_Word Elf32_Word
#define Elf_Sword Elf32_Sword
#define Elf_Addr Elf32_Addr
#define Elf_Off Elf32_Off
#define Elf_Nhdr Elf32_Nhdr
#define Elf_Note Elf32_Note
// Returns the address of the page containing address 'x'.
#define PAGE_START(x) ((x) & PAGE_MASK)
// Returns the offset of address 'x' in its page.
#define PAGE_OFFSET(x) ((x) & ~PAGE_MASK)
// Returns the address of the next page after address 'x', unless 'x' is
// itself at the start of a page.
#define PAGE_END(x) PAGE_START((x) + (PAGE_SIZE-1))
// Magic shared structures that GDB knows about.
struct link_map_t {
uintptr_t l_addr;
char* l_name;
uintptr_t l_ld;
link_map_t* l_next;
link_map_t* l_prev;
};
// Values for r_debug->state
enum {
RT_CONSISTENT,
RT_ADD,
RT_DELETE
};
#if 0
struct r_debug {
int32_t r_version;
link_map_t* r_map;
void (*r_brk)(void);
int32_t r_state;
uintptr_t r_ldbase;
};
#endif
#define FLAG_LINKED 0x00000001
#define FLAG_EXE 0x00000004 // The main executable
#define FLAG_LINKER 0x00000010 // The linker itself
#define SOINFO_NAME_LEN 128
typedef void (*linker_function_t)();
// Android uses REL for 32-bit but only uses RELA for 64-bit.
#if defined(__LP64__)
#define USE_RELA 1
#endif
struct soinfo {
public:
char name[SOINFO_NAME_LEN];
const Elf_Phdr* phdr;
size_t phnum;
Elf_Addr entry;
Elf_Addr base;
unsigned size;
#ifndef __LP64__
uint32_t unused1; // DO NOT USE, maintained for compatibility.
#endif
Elf_Dyn* dynamic;
#ifndef __LP64__
uint32_t unused2; // DO NOT USE, maintained for compatibility
uint32_t unused3; // DO NOT USE, maintained for compatibility
#endif
soinfo* next;
unsigned flags;
const char* strtab;
Elf_Sym* symtab;
size_t nbucket;
size_t nchain;
unsigned* bucket;
unsigned* chain;
#if !defined(__LP64__)
// This is only used by 32-bit MIPS, but needs to be here for
// all 32-bit architectures to preserve binary compatibility.
unsigned* plt_got;
#endif
#if defined(USE_RELA)
Elf_Rela* plt_rela;
size_t plt_rela_count;
Elf_Rela* rela;
size_t rela_count;
#else
Elf_Rel* plt_rel;
size_t plt_rel_count;
Elf_Rel* rel;
size_t rel_count;
#endif
linker_function_t* preinit_array;
size_t preinit_array_count;
linker_function_t* init_array;
size_t init_array_count;
linker_function_t* fini_array;
size_t fini_array_count;
linker_function_t init_func;
linker_function_t fini_func;
#if defined(__arm__)
// ARM EABI section used for stack unwinding.
unsigned* ARM_exidx;
size_t ARM_exidx_count;
#elif defined(__mips__)
unsigned mips_symtabno;
unsigned mips_local_gotno;
unsigned mips_gotsym;
#endif
size_t ref_count;
link_map_t link_map;
bool constructors_called;
// When you read a virtual address from the ELF file, add this
// value to get the corresponding address in the process' address space.
Elf_Addr load_bias;
#if !defined(__LP64__)
bool has_text_relocations;
#endif
bool has_DT_SYMBOLIC;
void CallConstructors();
void CallDestructors();
void CallPreInitConstructors();
private:
void CallArray(const char* array_name, linker_function_t* functions, size_t count, bool reverse);
void CallFunction(const char* function_name, linker_function_t function);
};
#endif
#endif