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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 <dlfcn.h>
  40.  
  41. /* From librtld. */
  42. #include <module.h>
  43. #include <symbol.h>
  44.  
  45. void *dlopen(const char *path, int flag)
  46. {
  47.     module_t *m;
  48.  
  49.     if (runtime_env == NULL) {
  50.         printf("Dynamic linker not set up -- initializing.\n");
  51.         rtld_init_static();
  52.     }
  53.  
  54.     printf("dlopen(\"%s\", %d)\n", path, flag);
  55.  
  56.     printf("module_find('%s')\n", path);
  57.     m = module_find(path);
  58.     if (m == NULL) {
  59.         printf("NULL. module_load('%s')\n", path);
  60.         m = module_load(path);
  61.         printf("module_load_deps(m)\n");
  62.         module_load_deps(m);
  63.         /* Now relocate. */
  64.         printf("module_process_relocs(m)\n");
  65.         module_process_relocs(m);
  66.     } else {
  67.         printf("not NULL\n");
  68.     }
  69.  
  70.     return (void *) m;
  71. }
  72.  
  73. /*
  74.  * @note Symbols with NULL values are not accounted for.
  75.  */
  76. void *dlsym(void *mod, const char *sym_name)
  77. {
  78.     elf_symbol_t *sd;
  79.     module_t *sm;
  80.  
  81.     printf("dlsym(0x%lx, \"%s\")\n", (long)mod, sym_name);
  82.     sd = symbol_bfs_find(sym_name, (module_t *) mod, &sm);
  83.     if (sd != NULL) {
  84.         return symbol_get_addr(sd, sm);
  85.     }
  86.  
  87.     return NULL;
  88. }
  89.  
  90. /** @}
  91.  */
  92.