1 /* 2 * Copyright (C) 2008 The Android Open Source Project 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the 13 * distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #ifndef _LINKER_H_ 30 #define _LINKER_H_ 31 32 #include <unistd.h> 33 #include <sys/types.h> 34 #include <linux/elf.h> 35 36 #undef PAGE_MASK 37 #undef PAGE_SIZE 38 #define PAGE_SIZE 4096 39 #define PAGE_MASK 4095 40 41 void debugger_init(); 42 const char *addr_to_name(unsigned addr); 43 44 /* magic shared structures that GDB knows about */ 45 46 struct link_map 47 { 48 uintptr_t l_addr; 49 char * l_name; 50 uintptr_t l_ld; 51 struct link_map * l_next; 52 struct link_map * l_prev; 53 }; 54 55 /* needed for dl_iterate_phdr to be passed to the callbacks provided */ 56 struct dl_phdr_info 57 { 58 Elf32_Addr dlpi_addr; 59 const char *dlpi_name; 60 const Elf32_Phdr *dlpi_phdr; 61 Elf32_Half dlpi_phnum; 62 }; 63 64 65 // Values for r_debug->state 66 enum { 67 RT_CONSISTENT, 68 RT_ADD, 69 RT_DELETE 70 }; 71 72 struct r_debug 73 { 74 int32_t r_version; 75 struct link_map * r_map; 76 void (*r_brk)(void); 77 int32_t r_state; 78 uintptr_t r_ldbase; 79 }; 80 81 typedef struct soinfo soinfo; 82 83 #define FLAG_LINKED 0x00000001 84 #define FLAG_ERROR 0x00000002 85 #define FLAG_EXE 0x00000004 // The main executable 86 #define FLAG_PRELINKED 0x00000008 // This is a pre-linked lib 87 88 #define SOINFO_NAME_LEN 128 89 90 struct soinfo 91 { 92 const char name[SOINFO_NAME_LEN]; 93 Elf32_Phdr *phdr; 94 int phnum; 95 unsigned entry; 96 unsigned base; 97 unsigned size; 98 // buddy-allocator index, negative for prelinked libraries 99 int ba_index; 100 101 unsigned *dynamic; 102 103 unsigned wrprotect_start; 104 unsigned wrprotect_end; 105 106 soinfo *next; 107 unsigned flags; 108 109 const char *strtab; 110 Elf32_Sym *symtab; 111 112 unsigned nbucket; 113 unsigned nchain; 114 unsigned *bucket; 115 unsigned *chain; 116 117 unsigned *plt_got; 118 119 Elf32_Rel *plt_rel; 120 unsigned plt_rel_count; 121 122 Elf32_Rel *rel; 123 unsigned rel_count; 124 125 #ifdef ANDROID_SH_LINKER 126 Elf32_Rela *plt_rela; 127 unsigned plt_rela_count; 128 129 Elf32_Rela *rela; 130 unsigned rela_count; 131 #endif /* ANDROID_SH_LINKER */ 132 133 unsigned *preinit_array; 134 unsigned preinit_array_count; 135 136 unsigned *init_array; 137 unsigned init_array_count; 138 unsigned *fini_array; 139 unsigned fini_array_count; 140 141 void (*init_func)(void); 142 void (*fini_func)(void); 143 144 #ifdef ANDROID_ARM_LINKER 145 /* ARM EABI section used for stack unwinding. */ 146 unsigned *ARM_exidx; 147 unsigned ARM_exidx_count; 148 #endif 149 150 unsigned refcount; 151 struct link_map linkmap; 152 }; 153 154 155 extern soinfo libdl_info; 156 157 /* these must all be powers of two */ 158 #ifdef ARCH_SH 159 #define LIBBASE 0x60000000 160 #define LIBLAST 0x70000000 161 #define LIBINC 0x00100000 162 #else 163 #define LIBBASE 0x80000000 164 #define LIBLAST 0x90000000 165 #define LIBINC 0x00100000 166 #endif 167 168 #ifdef ANDROID_ARM_LINKER 169 170 #define R_ARM_COPY 20 171 #define R_ARM_GLOB_DAT 21 172 #define R_ARM_JUMP_SLOT 22 173 #define R_ARM_RELATIVE 23 174 175 /* According to the AAPCS specification, we only 176 * need the above relocations. However, in practice, 177 * the following ones turn up from time to time. 178 */ 179 #define R_ARM_ABS32 2 180 #define R_ARM_REL32 3 181 182 #elif defined(ANDROID_X86_LINKER) 183 184 #define R_386_32 1 185 #define R_386_PC32 2 186 #define R_386_GLOB_DAT 6 187 #define R_386_JUMP_SLOT 7 188 #define R_386_RELATIVE 8 189 190 #elif defined(ANDROID_SH_LINKER) 191 192 #define R_SH_DIR32 1 193 #define R_SH_GLOB_DAT 163 194 #define R_SH_JUMP_SLOT 164 195 #define R_SH_RELATIVE 165 196 197 #endif /* ANDROID_*_LINKER */ 198 199 200 #ifndef DT_INIT_ARRAY 201 #define DT_INIT_ARRAY 25 202 #endif 203 204 #ifndef DT_FINI_ARRAY 205 #define DT_FINI_ARRAY 26 206 #endif 207 208 #ifndef DT_INIT_ARRAYSZ 209 #define DT_INIT_ARRAYSZ 27 210 #endif 211 212 #ifndef DT_FINI_ARRAYSZ 213 #define DT_FINI_ARRAYSZ 28 214 #endif 215 216 #ifndef DT_PREINIT_ARRAY 217 #define DT_PREINIT_ARRAY 32 218 #endif 219 220 #ifndef DT_PREINIT_ARRAYSZ 221 #define DT_PREINIT_ARRAYSZ 33 222 #endif 223 224 soinfo *find_library(const char *name); 225 unsigned unload_library(soinfo *si); 226 Elf32_Sym *lookup_in_library(soinfo *si, const char *name); 227 Elf32_Sym *lookup(const char *name, soinfo **found); 228 soinfo *find_containing_library(void *addr); 229 Elf32_Sym *find_containing_symbol(void *addr, soinfo *si); 230 const char *linker_get_error(void); 231 232 #ifdef ANDROID_ARM_LINKER 233 typedef long unsigned int *_Unwind_Ptr; 234 _Unwind_Ptr dl_unwind_find_exidx(_Unwind_Ptr pc, int *pcount); 235 #elif defined(ANDROID_X86_LINKER) || defined(ANDROID_SH_LINKER) 236 int dl_iterate_phdr(int (*cb)(struct dl_phdr_info *, size_t, void *), void *); 237 #endif 238 239 #endif 240
