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  1. /*
  2.  * Copyright (c) 2008 Jiri Svoboda
  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.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /** @addtogroup generic
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #ifndef DYNAMIC_H_
  36. #define DYNAMIC_H_
  37.  
  38. #include <bool.h>
  39. #include <elf_dyn.h>
  40.  
  41. /**
  42.  * Holds the data extracted from an ELF Dynamic section.
  43.  *
  44.  * The data is already pre-processed: Pointers are adjusted
  45.  * to their final run-time values by adding the load bias
  46.  * and indices into the symbol table are converted to pointers.
  47.  */
  48. typedef struct {
  49.     /** Type of relocations used for the PLT, either DT_REL or DT_RELA */
  50.     int plt_rel;
  51.  
  52.     /** Relocation table without explicit addends */
  53.     void *rel;
  54.     size_t rel_sz;
  55.     size_t rel_ent;
  56.  
  57.     /** Relocation table with explicit addends */
  58.     void *rela;
  59.     size_t rela_sz;
  60.     size_t rela_ent;
  61.  
  62.     /** PLT relocation table */
  63.     void *jmp_rel;
  64.     size_t plt_rel_sz;
  65.  
  66.     /** Pointer to PLT/GOT (processor-specific) */
  67.     void *plt_got;
  68.  
  69.     /** Hash table */
  70.     elf_word *hash;
  71.  
  72.     /** String table */
  73.     char *str_tab;
  74.     size_t str_sz;
  75.  
  76.     /** Symbol table */
  77.     void *sym_tab;
  78.     size_t sym_ent;
  79.  
  80.     void *init; /**< Module initialization code */
  81.     void *fini; /**< Module cleanup code */
  82.  
  83.     char *soname;   /**< Library identifier */
  84.     char *rpath;    /**< Library search path list */
  85.  
  86.     bool symbolic;
  87.     bool text_rel;
  88.     bool bind_now;
  89.  
  90.     /* Assume for now that there's at most one needed library */
  91.     char *needed;
  92.  
  93.     /** Pointer to the module's dynamic section */
  94.     elf_dyn_t *dynamic;
  95. } dyn_info_t;
  96.  
  97. void dynamic_parse(elf_dyn_t *dyn_ptr, size_t bias, dyn_info_t *info);
  98.  
  99. #endif
  100.  
  101. /** @}
  102.  */
  103.