1 /*- 2 * Copyright (c) 2006 Joseph Koshy 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 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD$ 27 */ 28 29 #ifndef _LIBELF_H_ 30 #define _LIBELF_H_ 31 32 #include <sys/types.h> 33 #include <sys/elf32.h> 34 #include <sys/elf64.h> 35 #include <sys/queue.h> 36 37 /* Library private data structures */ 38 typedef struct _Elf Elf; 39 typedef struct _Elf_Scn Elf_Scn; 40 41 /* File types */ 42 typedef enum { 43 ELF_K_NONE = 0, 44 ELF_K_AR, /* `ar' archives */ 45 ELF_K_COFF, /* COFF files (unsupported) */ 46 ELF_K_ELF, /* ELF files */ 47 ELF_K_NUM 48 } Elf_Kind; 49 50 #define ELF_K_FIRST ELF_K_NONE 51 #define ELF_K_LAST ELF_K_NUM 52 53 /* Data types */ 54 typedef enum { 55 ELF_T_ADDR, 56 ELF_T_BYTE, 57 ELF_T_CAP, 58 ELF_T_DYN, 59 ELF_T_EHDR, 60 ELF_T_HALF, 61 ELF_T_LWORD, 62 ELF_T_MOVE, 63 ELF_T_MOVEP, 64 ELF_T_NOTE, 65 ELF_T_OFF, 66 ELF_T_PHDR, 67 ELF_T_REL, 68 ELF_T_RELA, 69 ELF_T_SHDR, 70 ELF_T_SWORD, 71 ELF_T_SXWORD, 72 ELF_T_SYMINFO, 73 ELF_T_SYM, 74 ELF_T_VDEF, 75 ELF_T_VNEED, 76 ELF_T_WORD, 77 ELF_T_XWORD, 78 ELF_T_GNUHASH, /* GNU style hash tables. */ 79 ELF_T_NUM 80 } Elf_Type; 81 82 #define ELF_T_FIRST ELF_T_ADDR 83 #define ELF_T_LAST ELF_T_GNUHASH 84 85 /* Commands */ 86 typedef enum { 87 ELF_C_NULL = 0, 88 ELF_C_CLR, 89 ELF_C_FDDONE, 90 ELF_C_FDREAD, 91 ELF_C_RDWR, 92 ELF_C_READ, 93 ELF_C_SET, 94 ELF_C_WRITE, 95 ELF_C_NUM 96 } Elf_Cmd; 97 98 #define ELF_C_FIRST ELF_C_NULL 99 #define ELF_C_LAST ELF_C_NUM 100 101 /* 102 * An `Elf_Data' structure describes data in an 103 * ELF section. 104 */ 105 typedef struct _Elf_Data { 106 /* 107 * `Public' members that are part of the ELF(3) API. 108 */ 109 uint64_t d_align; 110 void *d_buf; 111 uint64_t d_off; 112 uint64_t d_size; 113 Elf_Type d_type; 114 unsigned int d_version; 115 116 /* 117 * Members that are not part of the public API. 118 */ 119 Elf_Scn *d_scn; /* containing section */ 120 unsigned int d_flags; 121 STAILQ_ENTRY(_Elf_Data) d_next; 122 } Elf_Data; 123 124 /* 125 * An `Elf_Arhdr' structure describes an archive 126 * header. 127 */ 128 typedef struct { 129 time_t ar_date; 130 char *ar_name; /* archive member name */ 131 gid_t ar_gid; 132 mode_t ar_mode; 133 char *ar_rawname; /* 'raw' member name */ 134 size_t ar_size; 135 uid_t ar_uid; 136 } Elf_Arhdr; 137 138 /* 139 * An `Elf_Arsym' describes an entry in the archive 140 * symbol table. 141 */ 142 typedef struct { 143 off_t as_off; /* byte offset to member's header */ 144 unsigned long as_hash; /* elf_hash() value for name */ 145 char *as_name; /* null terminated symbol name */ 146 } Elf_Arsym; 147 148 /* 149 * Error numbers. 150 */ 151 152 enum Elf_Error { 153 ELF_E_NONE, /* No error */ 154 ELF_E_ARCHIVE, /* Malformed ar(1) archive */ 155 ELF_E_ARGUMENT, /* Invalid argument */ 156 ELF_E_CLASS, /* Mismatched ELF class */ 157 ELF_E_DATA, /* Invalid data descriptor */ 158 ELF_E_HEADER, /* Missing or malformed ELF header */ 159 ELF_E_IO, /* I/O error */ 160 ELF_E_LAYOUT, /* Layout constraint violation */ 161 ELF_E_MODE, /* Wrong mode for ELF descriptor */ 162 ELF_E_RANGE, /* Value out of range */ 163 ELF_E_RESOURCE, /* Resource exhaustion */ 164 ELF_E_SECTION, /* Invalid section descriptor */ 165 ELF_E_SEQUENCE, /* API calls out of sequence */ 166 ELF_E_UNIMPL, /* Feature is unimplemented */ 167 ELF_E_VERSION, /* Unknown API version */ 168 ELF_E_NUM /* Max error number */ 169 }; 170 171 /* 172 * Flags defined by the API. 173 */ 174 175 #define ELF_F_LAYOUT 0x001U /* application will layout the file */ 176 #define ELF_F_DIRTY 0x002U /* a section or ELF file is dirty */ 177 178 __BEGIN_DECLS 179 Elf *elf_begin(int _fd, Elf_Cmd _cmd, Elf *_elf); 180 int elf_cntl(Elf *_elf, Elf_Cmd _cmd); 181 int elf_end(Elf *_elf); 182 const char *elf_errmsg(int _error); 183 int elf_errno(void); 184 void elf_fill(int _fill); 185 unsigned int elf_flagdata(Elf_Data *_data, Elf_Cmd _cmd, unsigned int _flags); 186 unsigned int elf_flagehdr(Elf *_elf, Elf_Cmd _cmd, unsigned int _flags); 187 unsigned int elf_flagelf(Elf *_elf, Elf_Cmd _cmd, unsigned int _flags); 188 unsigned int elf_flagphdr(Elf *_elf, Elf_Cmd _cmd, unsigned int _flags); 189 unsigned int elf_flagscn(Elf_Scn *_scn, Elf_Cmd _cmd, unsigned int _flags); 190 unsigned int elf_flagshdr(Elf_Scn *_scn, Elf_Cmd _cmd, unsigned int _flags); 191 Elf_Arhdr *elf_getarhdr(Elf *_elf); 192 Elf_Arsym *elf_getarsym(Elf *_elf, size_t *_ptr); 193 off_t elf_getbase(Elf *_elf); 194 Elf_Data *elf_getdata(Elf_Scn *, Elf_Data *); 195 char *elf_getident(Elf *_elf, size_t *_ptr); 196 int elf_getphdrnum(Elf *_elf, size_t *_dst); 197 int elf_getphnum(Elf *_elf, size_t *_dst); /* Deprecated */ 198 Elf_Scn *elf_getscn(Elf *_elf, size_t _index); 199 int elf_getshdrnum(Elf *_elf, size_t *_dst); 200 int elf_getshnum(Elf *_elf, size_t *_dst); /* Deprecated */ 201 int elf_getshdrstrndx(Elf *_elf, size_t *_dst); 202 int elf_getshstrndx(Elf *_elf, size_t *_dst); /* Deprecated */ 203 unsigned long elf_hash(const char *_name); 204 Elf_Kind elf_kind(Elf *_elf); 205 Elf *elf_memory(char *_image, size_t _size); 206 size_t elf_ndxscn(Elf_Scn *_scn); 207 Elf_Data *elf_newdata(Elf_Scn *_scn); 208 Elf_Scn *elf_newscn(Elf *_elf); 209 Elf_Scn *elf_nextscn(Elf *_elf, Elf_Scn *_scn); 210 Elf_Cmd elf_next(Elf *_elf); 211 off_t elf_rand(Elf *_elf, off_t _off); 212 Elf_Data *elf_rawdata(Elf_Scn *_scn, Elf_Data *_data); 213 char *elf_rawfile(Elf *_elf, size_t *_size); 214 int elf_setshstrndx(Elf *_elf, size_t _shnum); 215 char *elf_strptr(Elf *_elf, size_t _section, size_t _offset); 216 off_t elf_update(Elf *_elf, Elf_Cmd _cmd); 217 unsigned int elf_version(unsigned int _version); 218 219 long elf32_checksum(Elf *_elf); 220 size_t elf32_fsize(Elf_Type _type, size_t _count, 221 unsigned int _version); 222 Elf32_Ehdr *elf32_getehdr(Elf *_elf); 223 Elf32_Phdr *elf32_getphdr(Elf *_elf); 224 Elf32_Shdr *elf32_getshdr(Elf_Scn *_scn); 225 Elf32_Ehdr *elf32_newehdr(Elf *_elf); 226 Elf32_Phdr *elf32_newphdr(Elf *_elf, size_t _count); 227 Elf_Data *elf32_xlatetof(Elf_Data *_dst, const Elf_Data *_src, 228 unsigned int _enc); 229 Elf_Data *elf32_xlatetom(Elf_Data *_dst, const Elf_Data *_src, 230 unsigned int _enc); 231 232 long elf64_checksum(Elf *_elf); 233 size_t elf64_fsize(Elf_Type _type, size_t _count, 234 unsigned int _version); 235 Elf64_Ehdr *elf64_getehdr(Elf *_elf); 236 Elf64_Phdr *elf64_getphdr(Elf *_elf); 237 Elf64_Shdr *elf64_getshdr(Elf_Scn *_scn); 238 Elf64_Ehdr *elf64_newehdr(Elf *_elf); 239 Elf64_Phdr *elf64_newphdr(Elf *_elf, size_t _count); 240 Elf_Data *elf64_xlatetof(Elf_Data *_dst, const Elf_Data *_src, 241 unsigned int _enc); 242 Elf_Data *elf64_xlatetom(Elf_Data *_dst, const Elf_Data *_src, 243 unsigned int _enc); 244 245 #if defined(LIBELF_TEST_HOOKS) 246 int _libelf_get_elf_class(Elf *_elf); 247 int _libelf_get_max_error(void); 248 const char *_libelf_get_no_error_message(void); 249 const char *_libelf_get_unknown_error_message(void); 250 void _libelf_set_elf_class(Elf *_elf, int _class); 251 void _libelf_set_error(int _error); 252 #endif /* LIBELF_TEST_HOOKS */ 253 __END_DECLS 254 255 #endif /* _LIBELF_H_ */ 256