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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 rtld rtld
  30.  * @brief
  31.  * @{
  32.  */
  33. /**
  34.  * @file
  35.  */
  36.  
  37. #include <stdio.h>
  38. #include <stdlib.h>
  39. #include <string.h>
  40.  
  41. #include <rtld.h>
  42. #include <symbol.h>
  43. #include <elf.h>
  44.  
  45. static elf_symbol_t *def_find_in_module(char *name, module_t *m)
  46. {
  47.     elf_symbol_t *sym_table;
  48.     elf_symbol_t *sym;
  49.     elf_word nchain;
  50.     size_t i;
  51.     char *s_name;
  52.     char *module_name;
  53.  
  54.     module_name = m->dyn.soname;
  55.     printf("def_find_in_module('%s', %s)\n", name, module_name);
  56.  
  57.     sym_table = m->dyn.sym_tab;
  58.     nchain = m->dyn.hash[1];
  59.  
  60.     for (i = 0; i < nchain; ++i) {
  61.         sym = &sym_table[i];
  62.         s_name = m->dyn.str_tab + sym->st_name;
  63.         printf("cmp sym '%s'\n", s_name);
  64.         if (strcmp(name, s_name) == 0) {
  65.             printf("name match\n");
  66.             if (sym->st_shndx != SHN_UNDEF) {
  67.                 printf("definition found. idx=%d\n", i);
  68.                 return sym;
  69.             } else {
  70.                 printf("not a definition\n");
  71.             }
  72.         }
  73.     }
  74.  
  75.     printf("not found\n");
  76.     return NULL;
  77. }
  78.  
  79.  
  80. elf_symbol_t *symbol_def_find(char *name, module_t **m)
  81. {
  82.     elf_symbol_t *sym;
  83.  
  84.     sym = def_find_in_module(name, runtime_env.program);
  85.     if (sym != NULL) { *m = runtime_env.program; return sym; } 
  86.  
  87.     sym = def_find_in_module(name, runtime_env.libc);
  88.     if (sym != NULL) { *m = runtime_env.libc; return sym; }
  89.  
  90. /*  sym = def_find_in_module(name, runtime_env.rtld);
  91.     if (sym != NULL) { *m = runtime_env.rtld; return sym; }*/
  92.  
  93.     printf("symbol found nowhere\n");
  94.     *m = NULL;
  95.     return NULL;
  96. }
  97.  
  98. /** @}
  99.  */
  100.