ldso/include/dl-hash.h

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Copyright (C) 2000-2006 by Erik Andersen <andersen@codepoet.org>
   4  *
   5  * GNU Lesser General Public License version 2.1 or later.
   6  */
   7
   8 #ifndef _DL_HASH_H
   9 #define _DL_HASH_H
  10
  11 #ifndef RTLD_NEXT
  12 #define RTLD_NEXT       ((void*)-1)
  13 #endif
  14
  15 struct init_fini {
  16         struct elf_resolve **init_fini;
  17         unsigned long nlist; /* Number of entries in init_fini */
  18 };
  19
  20 struct dyn_elf {
  21   struct elf_resolve * dyn;
  22   struct dyn_elf * next_handle;  /* Used by dlopen et al. */
  23   struct init_fini init_fini;
  24   struct dyn_elf * next;
  25   struct dyn_elf * prev;
  26 };
  27
  28 struct symbol_ref {
  29   const ElfW(Sym) *sym;
  30   struct elf_resolve *tpnt;
  31 };
  32
  33 /* Structure to describe a single list of scope elements.  The lookup
  34    functions get passed an array of pointers to such structures.  */
  35 struct r_scope_elem {
  36   struct elf_resolve **r_list; /* Array of maps for the scope.  */
  37   unsigned int r_nlist;        /* Number of entries in the scope.  */
  38   struct r_scope_elem *next;
  39 };
  40
  41 struct elf_resolve {
  42   /* These entries must be in this order to be compatible with the interface used
  43      by gdb to obtain the list of symbols. */
  44   DL_LOADADDR_TYPE loadaddr;    /* Base address shared object is loaded at.  */
  45   char *libname;                /* Absolute file name object was found in.  */
  46   ElfW(Dyn) *dynamic_addr;      /* Dynamic section of the shared object.  */
  47   struct elf_resolve * next;
  48   struct elf_resolve * prev;
  49   /* Nothing after this address is used by gdb. */
  50
  51 #if defined(USE_TLS) && USE_TLS
  52   /* Thread-local storage related info.  */
  53
  54   /* Start of the initialization image.  */
  55   void *l_tls_initimage;
  56   /* Size of the initialization image.  */
  57   size_t l_tls_initimage_size;
  58   /* Size of the TLS block.  */
  59   size_t l_tls_blocksize;
  60   /* Alignment requirement of the TLS block.  */
  61   size_t l_tls_align;
  62   /* Offset of first byte module alignment.  */
  63   size_t l_tls_firstbyte_offset;
  64 # ifndef NO_TLS_OFFSET
  65 #  define NO_TLS_OFFSET 0
  66 # endif
  67   /* For objects present at startup time: offset in the static TLS block.  */
  68   ptrdiff_t l_tls_offset;
  69   /* Index of the module in the dtv array.  */
  70   size_t l_tls_modid;
  71   /* Nonzero if _dl_init_static_tls should be called for this module */
  72   unsigned int l_need_tls_init:1;
  73   /* Address of TLS descriptor hash table.  */
  74   void *l_tlsdesc_table;
  75 #endif
  76
  77   ElfW(Addr) mapaddr;
  78 #ifdef __LDSO_STANDALONE_SUPPORT__
  79   /* Store the entry point from the ELF header (e_entry) */
  80   ElfW(Addr) l_entry;
  81 #endif
  82   enum {elf_lib, elf_executable,program_interpreter, loaded_file} libtype;
  83   /* This is the local scope of the shared object */
  84   struct r_scope_elem symbol_scope;
  85   unsigned short usage_count;
  86   unsigned short int init_flag;
  87   unsigned long rtld_flags; /* RTLD_GLOBAL, RTLD_NOW etc. */
  88   Elf_Symndx nbucket;
  89
  90 #ifdef __LDSO_GNU_HASH_SUPPORT__
  91   /* Data needed to support GNU hash style */
  92   Elf32_Word l_gnu_bitmask_idxbits;
  93   Elf32_Word l_gnu_shift;
  94   const ElfW(Addr) *l_gnu_bitmask;
  95
  96   union
  97   {
  98     const Elf32_Word *l_gnu_chain_zero;
  99     const Elf_Symndx *elf_buckets;
 100   };
 101 #else
 102   Elf_Symndx *elf_buckets;
 103 #endif
 104
 105   struct init_fini_list *init_fini;
 106   struct init_fini_list *rtld_local; /* keep tack of RTLD_LOCAL libs in same group */
 107   /*
 108    * These are only used with ELF style shared libraries
 109    */
 110   Elf_Symndx nchain;
 111
 112 #ifdef __LDSO_GNU_HASH_SUPPORT__
 113   union
 114   {
 115     const Elf32_Word *l_gnu_buckets;
 116     const Elf_Symndx *chains;
 117   };
 118 #else
 119   Elf_Symndx *chains;
 120 #endif
 121   unsigned long dynamic_info[DYNAMIC_SIZE];
 122
 123   unsigned long n_phent;
 124   ElfW(Phdr) * ppnt;
 125
 126   ElfW(Addr) relro_addr;
 127   size_t relro_size;
 128
 129   dev_t st_dev;      /* device */
 130   ino_t st_ino;      /* inode */
 131
 132 #ifdef __powerpc__
 133   /* this is used to store the address of relocation data words, so
 134    * we don't have to calculate it every time, which requires a divide */
 135   unsigned long data_words;
 136 #endif
 137
 138 #if defined(__FRV_FDPIC__) || defined(__BFIN_FDPIC__)
 139   /* Every loaded module holds a hashtable of function descriptors of
 140      functions defined in it, such that it's easy to release the
 141      memory when the module is dlclose()d.  */
 142   struct funcdesc_ht *funcdesc_ht;
 143 #endif
 144 #ifdef __DSBT__
 145   /* Information for DSBT */
 146   void **dsbt_table;
 147   unsigned long dsbt_size;
 148   unsigned long dsbt_index;
 149 #endif
 150 };
 151
 152 #define RELOCS_DONE         0x000001
 153 #define JMP_RELOCS_DONE     0x000002
 154 #define INIT_FUNCS_CALLED   0x000004
 155 #define FINI_FUNCS_CALLED   0x000008
 156 #define DL_OPENED2          0x000010
 157 #define DL_RESERVED         0x000020
 158
 159 extern struct dyn_elf     * _dl_symbol_tables;
 160 extern struct elf_resolve * _dl_loaded_modules;
 161 extern struct dyn_elf     * _dl_handles;
 162
 163 extern struct elf_resolve * _dl_add_elf_hash_table(const char * libname,
 164         DL_LOADADDR_TYPE loadaddr, unsigned long * dynamic_info,
 165         unsigned long dynamic_addr, unsigned long dynamic_size);
 166
 167 extern char *_dl_find_hash(const char *name, struct r_scope_elem *scope,
 168                 struct elf_resolve *mytpnt, int type_class,
 169                 struct symbol_ref *symbol);
 170
 171 extern char * _dl_library_path;
 172
 173 #define LD_ERROR_NOFILE 1
 174 #define LD_ERROR_NOZERO 2
 175 #define LD_ERROR_NOTELF 3
 176 #define LD_ERROR_NOTMAGIC 4
 177 #define LD_ERROR_NOTDYN 5
 178 #define LD_ERROR_MMAP_FAILED 6
 179 #define LD_ERROR_NODYNAMIC 7
 180 #define LD_ERROR_TLS_FAILED 8
 181 #define LD_WRONG_RELOCS 9
 182 #define LD_BAD_HANDLE 10
 183 #define LD_NO_SYMBOL 11
 184
 185 #endif /* _DL_HASH_H */