external/bsd/libelf/dist/_libelf.h

   1 /*      $NetBSD: _libelf.h,v 1.3 2009/12/19 07:47:22 thorpej Exp $      */
   2
   3 /*-
   4  * Copyright (c) 2006 Joseph Koshy
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  *
  28  * $FreeBSD: src/lib/libelf/_libelf.h,v 1.2.10.1.2.1 2009/10/25 01:10:29 kensmith Exp $
  29  */
  30
  31 #ifndef __LIBELF_H_
  32 #define __LIBELF_H_
  33
  34 #include <sys/queue.h>
  35
  36 #ifndef NULL
  37 #define NULL    ((void *) 0)
  38 #endif
  39
  40 /*
  41  * Library-private data structures.
  42  */
  43
  44 #define LIBELF_MSG_SIZE 256
  45
  46 struct _libelf_globals {
  47         int             libelf_error;
  48         int             libelf_fillchar;
  49         unsigned int    libelf_version;
  50         char            libelf_msg[LIBELF_MSG_SIZE];
  51 };
  52
  53 extern struct _libelf_globals _libelf;
  54
  55 #define LIBELF_PRIVATE(N)       (_libelf.libelf_##N)
  56
  57 #define LIBELF_ELF_ERROR_MASK   0xFF
  58 #define LIBELF_OS_ERROR_SHIFT   8
  59
  60 #define LIBELF_SET_ERROR(E, O) do {                                     \
  61         LIBELF_PRIVATE(error) = ((ELF_E_##E & LIBELF_ELF_ERROR_MASK)|   \
  62             ((O) << LIBELF_OS_ERROR_SHIFT));                            \
  63         } while (/*CONSTCOND*/0)
  64
  65 #define LIBELF_ADJUST_AR_SIZE(S)        (((S) + 1U) & ~1U)
  66
  67 /*
  68  * Flags for library internal use.  These use the upper 16 bits of a
  69  * flags field.
  70  */
  71 #define LIBELF_F_MALLOCED       0x010000 /* whether data was malloc'ed */
  72 #define LIBELF_F_MMAP           0x020000 /* whether e_rawfile was mmap'ed */
  73 #define LIBELF_F_SHDRS_LOADED   0x040000 /* whether all shdrs were read in */
  74
  75 struct _Elf {
  76         int             e_activations;  /* activation count */
  77         Elf_Arhdr       *e_arhdr;       /* header for archive members */
  78         unsigned int    e_byteorder;    /* ELFDATA* */
  79         int             e_class;        /* ELFCLASS*  */
  80         Elf_Cmd         e_cmd;          /* ELF_C_* used at creation time */
  81         int             e_fd;           /* associated file descriptor */
  82         unsigned int    e_flags;        /* ELF_F_*, LIBELF_F_* flags */
  83         Elf_Kind        e_kind;         /* ELF_K_* */
  84         Elf             *e_parent;      /* non-NULL for archive members */
  85         char            *e_rawfile;     /* uninterpreted bytes */
  86         size_t          e_rawsize;      /* size of uninterpreted bytes */
  87         unsigned int    e_version;      /* file version */
  88
  89         union {
  90                 struct {                /* ar(1) archives */
  91                         off_t   e_next; /* set by elf_rand()/elf_next() */
  92                         int     e_nchildren;
  93                         char    *e_rawstrtab;   /* file name strings */
  94                         size_t  e_rawstrtabsz;
  95                         char    *e_rawsymtab;   /* symbol table */
  96                         size_t  e_rawsymtabsz;
  97                         Elf_Arsym *e_symtab;
  98                         size_t  e_symtabsz;
  99                 } e_ar;
 100                 struct {                /* regular ELF files */
 101                         union {
 102                                 Elf32_Ehdr *e_ehdr32;
 103                                 Elf64_Ehdr *e_ehdr64;
 104                         } e_ehdr;
 105                         union {
 106                                 Elf32_Phdr *e_phdr32;
 107                                 Elf64_Phdr *e_phdr64;
 108                         } e_phdr;
 109                         STAILQ_HEAD(, _Elf_Scn) e_scn;  /* section list */
 110                         size_t  e_nphdr;        /* number of Phdr entries */
 111                         size_t  e_nscn;         /* number of sections */
 112                         size_t  e_strndx;       /* string table section index */
 113                 } e_elf;
 114         } e_u;
 115 };
 116
 117 struct _Elf_Scn {
 118         union {
 119                 Elf32_Shdr      s_shdr32;
 120                 Elf64_Shdr      s_shdr64;
 121         } s_shdr;
 122         STAILQ_HEAD(, _Elf_Data) s_data;        /* list of Elf_Data descriptors */
 123         STAILQ_HEAD(, _Elf_Data) s_rawdata;     /* raw data for this section */
 124         STAILQ_ENTRY(_Elf_Scn) s_next;
 125         struct _Elf     *s_elf;         /* parent ELF descriptor */
 126         unsigned int    s_flags;        /* flags for the section as a whole */
 127         size_t          s_ndx;          /* index# for this section */
 128         uint64_t        s_offset;       /* managed by elf_update() */
 129         uint64_t        s_rawoff;       /* original offset in the file */
 130         uint64_t        s_size;         /* managed by elf_update() */
 131 };
 132
 133
 134 enum {
 135         ELF_TOFILE,
 136         ELF_TOMEMORY
 137 };
 138
 139 #define LIBELF_COPY_U32(DST,SRC,NAME)   do {            \
 140                 if ((uint64_t)(SRC)->NAME > UINT_MAX) { \
 141                         LIBELF_SET_ERROR(RANGE, 0);     \
 142                         return (0);                     \
 143                 }                                       \
 144                 (DST)->NAME = (SRC)->NAME;              \
 145         } while (/*CONSTCOND*/0)
 146
 147 #define LIBELF_COPY_S32(DST,SRC,NAME)   do {            \
 148                 if ((int64_t)(SRC)->NAME > INT_MAX ||   \
 149                     (int64_t)(SRC)->NAME < INT_MIN) {   \
 150                         LIBELF_SET_ERROR(RANGE, 0);     \
 151                         return (0);                     \
 152                 }                                       \
 153                 (DST)->NAME = (SRC)->NAME;              \
 154         } while (/*CONSTCOND*/0)
 155
 156
 157 /*
 158  * Prototypes
 159  */
 160
 161 unsigned int _libelf_host_byteorder(void);
 162
 163 Elf_Data *_libelf_allocate_data(Elf_Scn *_s);
 164 Elf     *_libelf_allocate_elf(void);
 165 Elf_Scn *_libelf_allocate_scn(Elf *_e, size_t _ndx);
 166 Elf_Arhdr *_libelf_ar_gethdr(Elf *_e);
 167 Elf     *_libelf_ar_open(Elf *_e);
 168 Elf     *_libelf_ar_open_member(int _fd, Elf_Cmd _c, Elf *_ar);
 169 Elf_Arsym *_libelf_ar_process_symtab(Elf *_ar, size_t *_dst);
 170 unsigned long _libelf_checksum(Elf *_e, int _elfclass);
 171 void    *_libelf_ehdr(Elf *_e, int _elfclass, int _allocate);
 172 int     _libelf_falign(Elf_Type _t, int _elfclass);
 173 size_t  _libelf_fsize(Elf_Type _t, int _elfclass, unsigned int _version,
 174     size_t count);
 175 void    (*_libelf_get_translator(Elf_Type _t, int _direction, int _elfclass))
 176             (char *_dst, char *_src, size_t _cnt, int _byteswap);
 177 void    *_libelf_getphdr(Elf *_e, int _elfclass);
 178 void    *_libelf_getshdr(Elf_Scn *_scn, int _elfclass);
 179 void    _libelf_init_elf(Elf *_e, Elf_Kind _kind);
 180 int     _libelf_malign(Elf_Type _t, int _elfclass);
 181 size_t  _libelf_msize(Elf_Type _t, int _elfclass, unsigned int _version);
 182 void    *_libelf_newphdr(Elf *_e, int _elfclass, size_t _count);
 183 Elf_Data *_libelf_release_data(Elf_Data *_d);
 184 Elf     *_libelf_release_elf(Elf *_e);
 185 Elf_Scn *_libelf_release_scn(Elf_Scn *_s);
 186 int     _libelf_setphnum(Elf *_e, void *_eh, int _elfclass, size_t _phnum);
 187 int     _libelf_setshnum(Elf *_e, void *_eh, int _elfclass, size_t _shnum);
 188 int     _libelf_setshstrndx(Elf *_e, void *_eh, int _elfclass,
 189     size_t _shstrndx);
 190 Elf_Data *_libelf_xlate(Elf_Data *_d, const Elf_Data *_s,
 191     unsigned int _encoding, int _elfclass, int _direction);
 192 int     _libelf_xlate_shtype(uint32_t _sht);
 193
 194 #endif  /* __LIBELF_H_ */