180 lines
4.7 KiB
C++
180 lines
4.7 KiB
C++
/*
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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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#include <unistd.h>
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#include <sys/types.h>
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#include <elf.h>
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#include <sys/exec_elf.h>
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#include <link.h>
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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 {
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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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struct link_map * l_next;
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struct link_map * 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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struct r_debug {
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int32_t r_version;
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struct link_map* 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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#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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struct soinfo {
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char name[SOINFO_NAME_LEN];
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const Elf32_Phdr* phdr;
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int phnum;
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unsigned entry;
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unsigned base;
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unsigned size;
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int unused; // DO NOT USE, maintained for compatibility.
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unsigned* dynamic;
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unsigned unused2; // DO NOT USE, maintained for compatibility
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unsigned unused3; // DO NOT USE, maintained for compatibility
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soinfo* next;
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unsigned flags;
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const char* strtab;
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Elf32_Sym* symtab;
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unsigned nbucket;
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unsigned nchain;
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unsigned* bucket;
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unsigned* chain;
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unsigned* plt_got;
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Elf32_Rel* plt_rel;
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unsigned plt_rel_count;
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Elf32_Rel* rel;
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unsigned rel_count;
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unsigned* preinit_array;
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unsigned preinit_array_count;
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unsigned* init_array;
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unsigned init_array_count;
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unsigned* fini_array;
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unsigned fini_array_count;
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void (*init_func)();
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void (*fini_func)();
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#if defined(ANDROID_ARM_LINKER)
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// ARM EABI section used for stack unwinding.
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unsigned* ARM_exidx;
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unsigned ARM_exidx_count;
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#elif defined(ANDROID_MIPS_LINKER)
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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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unsigned refcount;
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struct link_map linkmap;
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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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Elf32_Addr load_bias;
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bool has_text_relocations;
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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, unsigned* array, int count, bool reverse);
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void CallFunction(const char* function_name, void (*function)());
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};
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extern soinfo libdl_info;
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// These aren't defined in <sys/exec_elf.h>.
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#ifndef DT_PREINIT_ARRAY
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#define DT_PREINIT_ARRAY 32
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#endif
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#ifndef DT_PREINIT_ARRAYSZ
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#define DT_PREINIT_ARRAYSZ 33
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#endif
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void do_android_update_LD_LIBRARY_PATH(const char* ld_library_path);
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soinfo* do_dlopen(const char* name, int flags);
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int do_dlclose(soinfo* si);
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Elf32_Sym* lookup(const char* name, soinfo** found, soinfo* start);
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soinfo* find_containing_library(const void* addr);
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const char* linker_get_error();
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Elf32_Sym* soinfo_find_symbol(soinfo* si, const void* addr);
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Elf32_Sym* soinfo_lookup(soinfo* si, const char* name);
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void debugger_init();
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extern "C" void notify_gdb_of_libraries();
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#endif
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