/* * 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_ #include #include #include #include #ifdef __cplusplus extern "C" { #endif #undef PAGE_MASK #undef PAGE_SIZE #define PAGE_SIZE 4096 #define PAGE_MASK (PAGE_SIZE-1) /* Convenience macros to make page address/offset computations more explicit */ /* Returns the address of the page starting at address 'x' */ #define PAGE_START(x) ((x) & ~PAGE_MASK) /* Returns the offset of address 'x' in its memory page, i.e. this is the * same than 'x' - PAGE_START(x) */ #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. Equivalent to: * * (x == PAGE_START(x)) ? x : PAGE_START(x)+PAGE_SIZE */ #define PAGE_END(x) PAGE_START((x) + (PAGE_SIZE-1)) void debugger_init(); const char *addr_to_name(unsigned addr); /* magic shared structures that GDB knows about */ struct link_map { uintptr_t l_addr; char * l_name; uintptr_t l_ld; struct link_map * l_next; struct link_map * l_prev; }; /* needed for dl_iterate_phdr to be passed to the callbacks provided */ struct dl_phdr_info { Elf32_Addr dlpi_addr; const char *dlpi_name; const Elf32_Phdr *dlpi_phdr; Elf32_Half dlpi_phnum; }; // Values for r_debug->state enum { RT_CONSISTENT, RT_ADD, RT_DELETE }; struct r_debug { int32_t r_version; struct link_map * r_map; void (*r_brk)(void); int32_t r_state; uintptr_t r_ldbase; }; typedef struct soinfo soinfo; #define FLAG_LINKED 0x00000001 #define FLAG_ERROR 0x00000002 #define FLAG_EXE 0x00000004 // The main executable #define FLAG_LINKER 0x00000010 // The linker itself #define SOINFO_NAME_LEN 128 struct soinfo { char name[SOINFO_NAME_LEN]; const Elf32_Phdr *phdr; int phnum; unsigned entry; unsigned base; unsigned size; int unused; // DO NOT USE, maintained for compatibility. unsigned *dynamic; unsigned unused2; // DO NOT USE, maintained for compatibility unsigned unused3; // DO NOT USE, maintained for compatibility soinfo *next; unsigned flags; const char *strtab; Elf32_Sym *symtab; unsigned nbucket; unsigned nchain; unsigned *bucket; unsigned *chain; unsigned *plt_got; Elf32_Rel *plt_rel; unsigned plt_rel_count; Elf32_Rel *rel; unsigned rel_count; unsigned *preinit_array; unsigned preinit_array_count; unsigned *init_array; unsigned init_array_count; unsigned *fini_array; unsigned fini_array_count; void (*init_func)(void); void (*fini_func)(void); #if defined(ANDROID_ARM_LINKER) /* ARM EABI section used for stack unwinding. */ unsigned *ARM_exidx; unsigned ARM_exidx_count; #elif defined(ANDROID_MIPS_LINKER) #if 0 /* not yet */ unsigned *mips_pltgot #endif unsigned mips_symtabno; unsigned mips_local_gotno; unsigned mips_gotsym; #endif /* ANDROID_*_LINKER */ unsigned refcount; struct link_map linkmap; int 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 */ Elf32_Addr load_bias; int has_text_relocations; }; extern soinfo libdl_info; #include #if defined(ANDROID_ARM_LINKER) // These aren't defined in . #define R_ARM_REL32 3 #define R_ARM_COPY 20 #define R_ARM_GLOB_DAT 21 #define R_ARM_JUMP_SLOT 22 #define R_ARM_RELATIVE 23 #elif defined(ANDROID_MIPS_LINKER) // These aren't defined in . #define R_MIPS_JUMP_SLOT 127 #define DT_MIPS_PLTGOT 0x70000032 #define DT_MIPS_RWPLT 0x70000034 #elif defined(ANDROID_X86_LINKER) // x86 has everything it needs in . #endif /* ANDROID_*_LINKER */ #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_PREINIT_ARRAY #define DT_PREINIT_ARRAY 32 #endif #ifndef DT_PREINIT_ARRAYSZ #define DT_PREINIT_ARRAYSZ 33 #endif soinfo *find_library(const char *name); Elf32_Sym *lookup(const char *name, soinfo **found, soinfo *start); soinfo *find_containing_library(const void *addr); const char *linker_get_error(void); unsigned soinfo_unload(soinfo *si); Elf32_Sym *soinfo_find_symbol(soinfo* si, const void *addr); Elf32_Sym *soinfo_lookup(soinfo *si, const char *name); void soinfo_call_constructors(soinfo *si); #if defined(ANDROID_ARM_LINKER) typedef long unsigned int *_Unwind_Ptr; _Unwind_Ptr dl_unwind_find_exidx(_Unwind_Ptr pc, int *pcount); #elif defined(ANDROID_X86_LINKER) || defined(ANDROID_MIPS_LINKER) int dl_iterate_phdr(int (*cb)(struct dl_phdr_info *, size_t, void *), void *); #endif #ifdef __cplusplus }; #endif #endif