ldso/include/dl-hash.h

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