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