lib/libelf/libelf.h

   1 /*-
   2  * Copyright (c) 2006,2008-2010 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  * $Id$
  27  */
  28
  29 #ifndef _LIBELF_H_
  30 #define _LIBELF_H_
  31
  32 #include <sys/param.h>
  33 #include <sys/queue.h>
  34
  35 #include <elfdefinitions.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
 137         /*
 138          * Members that are not part of the public API.
 139          */
 140         int             ar_flags;
 141 } Elf_Arhdr;
 142
 143 /*
 144  * An `Elf_Arsym' describes an entry in the archive
 145  * symbol table.
 146  */
 147 typedef struct {
 148         off_t           as_off;         /* byte offset to member's header */
 149         unsigned long   as_hash;        /* elf_hash() value for name */
 150         char            *as_name;       /* null terminated symbol name */
 151 } Elf_Arsym;
 152
 153 /*
 154  * Error numbers.
 155  */
 156
 157 enum Elf_Error {
 158         ELF_E_NONE,     /* No error */
 159         ELF_E_ARCHIVE,  /* Malformed ar(1) archive */
 160         ELF_E_ARGUMENT, /* Invalid argument */
 161         ELF_E_CLASS,    /* Mismatched ELF class */
 162         ELF_E_DATA,     /* Invalid data descriptor */
 163         ELF_E_HEADER,   /* Missing or malformed ELF header */
 164         ELF_E_IO,       /* I/O error */
 165         ELF_E_LAYOUT,   /* Layout constraint violation */
 166         ELF_E_MODE,     /* Wrong mode for ELF descriptor */
 167         ELF_E_RANGE,    /* Value out of range */
 168         ELF_E_RESOURCE, /* Resource exhaustion */
 169         ELF_E_SECTION,  /* Invalid section descriptor */
 170         ELF_E_SEQUENCE, /* API calls out of sequence */
 171         ELF_E_UNIMPL,   /* Feature is unimplemented */
 172         ELF_E_VERSION,  /* Unknown API version */
 173         ELF_E_NUM       /* Max error number */
 174 };
 175
 176 /*
 177  * Flags defined by the API.
 178  */
 179
 180 #define ELF_F_LAYOUT    0x001U  /* application will layout the file */
 181 #define ELF_F_DIRTY     0x002U  /* a section or ELF file is dirty */
 182
 183 /* ELF(3) API extensions. */
 184 #define ELF_F_ARCHIVE      0x100U /* archive creation */
 185 #define ELF_F_ARCHIVE_SYSV 0x200U /* SYSV style archive */
 186
 187 __BEGIN_DECLS
 188 Elf             *elf_begin(int _fd, Elf_Cmd _cmd, Elf *_elf);
 189 int             elf_cntl(Elf *_elf, Elf_Cmd _cmd);
 190 int             elf_end(Elf *_elf);
 191 const char      *elf_errmsg(int _error);
 192 int             elf_errno(void);
 193 void            elf_fill(int _fill);
 194 unsigned int    elf_flagarhdr(Elf_Arhdr *_arh, Elf_Cmd _cmd,
 195                         unsigned int _flags);
 196 unsigned int    elf_flagdata(Elf_Data *_data, Elf_Cmd _cmd,
 197                         unsigned int _flags);
 198 unsigned int    elf_flagehdr(Elf *_elf, Elf_Cmd _cmd, unsigned int _flags);
 199 unsigned int    elf_flagelf(Elf *_elf, Elf_Cmd _cmd, unsigned int _flags);
 200 unsigned int    elf_flagphdr(Elf *_elf, Elf_Cmd _cmd, unsigned int _flags);
 201 unsigned int    elf_flagscn(Elf_Scn *_scn, Elf_Cmd _cmd, unsigned int _flags);
 202 unsigned int    elf_flagshdr(Elf_Scn *_scn, Elf_Cmd _cmd, unsigned int _flags);
 203 Elf_Arhdr       *elf_getarhdr(Elf *_elf);
 204 Elf_Arsym       *elf_getarsym(Elf *_elf, size_t *_ptr);
 205 off_t           elf_getbase(Elf *_elf);
 206 Elf_Data        *elf_getdata(Elf_Scn *, Elf_Data *);
 207 char            *elf_getident(Elf *_elf, size_t *_ptr);
 208 int             elf_getphdrnum(Elf *_elf, size_t *_dst);
 209 int             elf_getphnum(Elf *_elf, size_t *_dst);  /* Deprecated */
 210 Elf_Scn         *elf_getscn(Elf *_elf, size_t _index);
 211 int             elf_getshdrnum(Elf *_elf, size_t *_dst);
 212 int             elf_getshnum(Elf *_elf, size_t *_dst);  /* Deprecated */
 213 int             elf_getshdrstrndx(Elf *_elf, size_t *_dst);
 214 int             elf_getshstrndx(Elf *_elf, size_t *_dst); /* Deprecated */
 215 unsigned long   elf_hash(const char *_name);
 216 Elf_Kind        elf_kind(Elf *_elf);
 217 Elf             *elf_memory(char *_image, size_t _size);
 218 size_t          elf_ndxscn(Elf_Scn *_scn);
 219 Elf_Data        *elf_newdata(Elf_Scn *_scn);
 220 Elf_Scn         *elf_newscn(Elf *_elf);
 221 Elf_Scn         *elf_nextscn(Elf *_elf, Elf_Scn *_scn);
 222 Elf_Cmd         elf_next(Elf *_elf);
 223 off_t           elf_rand(Elf *_elf, off_t _off);
 224 Elf_Data        *elf_rawdata(Elf_Scn *_scn, Elf_Data *_data);
 225 char            *elf_rawfile(Elf *_elf, size_t *_size);
 226 int             elf_setshstrndx(Elf *_elf, size_t _shnum);
 227 char            *elf_strptr(Elf *_elf, size_t _section, size_t _offset);
 228 off_t           elf_update(Elf *_elf, Elf_Cmd _cmd);
 229 unsigned int    elf_version(unsigned int _version);
 230
 231 long            elf32_checksum(Elf *_elf);
 232 size_t          elf32_fsize(Elf_Type _type, size_t _count,
 233                         unsigned int _version);
 234 Elf32_Ehdr      *elf32_getehdr(Elf *_elf);
 235 Elf32_Phdr      *elf32_getphdr(Elf *_elf);
 236 Elf32_Shdr      *elf32_getshdr(Elf_Scn *_scn);
 237 Elf32_Ehdr      *elf32_newehdr(Elf *_elf);
 238 Elf32_Phdr      *elf32_newphdr(Elf *_elf, size_t _count);
 239 Elf_Data        *elf32_xlatetof(Elf_Data *_dst, const Elf_Data *_src,
 240                         unsigned int _enc);
 241 Elf_Data        *elf32_xlatetom(Elf_Data *_dst, const Elf_Data *_src,
 242                         unsigned int _enc);
 243
 244 long            elf64_checksum(Elf *_elf);
 245 size_t          elf64_fsize(Elf_Type _type, size_t _count,
 246                         unsigned int _version);
 247 Elf64_Ehdr      *elf64_getehdr(Elf *_elf);
 248 Elf64_Phdr      *elf64_getphdr(Elf *_elf);
 249 Elf64_Shdr      *elf64_getshdr(Elf_Scn *_scn);
 250 Elf64_Ehdr      *elf64_newehdr(Elf *_elf);
 251 Elf64_Phdr      *elf64_newphdr(Elf *_elf, size_t _count);
 252 Elf_Data        *elf64_xlatetof(Elf_Data *_dst, const Elf_Data *_src,
 253                         unsigned int _enc);
 254 Elf_Data        *elf64_xlatetom(Elf_Data *_dst, const Elf_Data *_src,
 255                         unsigned int _enc);
 256 __END_DECLS
 257
 258 #endif  /* _LIBELF_H_ */