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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
  30.  * @brief   Test dynamic linking capabilities.
  31.  * @{
  32.  */
  33. /**
  34.  * @file
  35.  */
  36.  
  37. #include <stdio.h>
  38. #include <stdlib.h>
  39. #include <dlfcn.h>
  40.  
  41. static void kputint(unsigned i)
  42. {
  43. //  unsigned dummy;
  44. //  asm volatile (
  45. //      "movl $30, %%eax;"
  46. //      "int $0x30"
  47. //      : "=d" (dummy) /* output - %edx clobbered */
  48. //      : "d" (i) /* input */
  49. //      : "%eax","%ecx" /* all scratch registers clobbered */
  50. //  );
  51. /*
  52.     asm volatile (
  53.         "mr %%r3, %0\n"
  54.         "li %%r9, 32\n"
  55.         "sc\n"
  56.         :
  57.         : "r" (i)
  58.         : "%r3","%r9"
  59.     );
  60. */
  61. }
  62.  
  63. typedef int (*fptr_t)(void);
  64.  
  65. int main(int argc, char *argv[])
  66. {
  67.     void *a;
  68.     void *s;
  69.     fptr_t fun;
  70.     int i;
  71.  
  72.     char *lib_name;
  73.     char *sym_name;
  74.  
  75. //  kputint(-1);
  76.     printf("Hello from dltest!\n");
  77.  
  78.     lib_name = "libtest.so.0";
  79.     sym_name = "test_func";
  80.  
  81.     a = dlopen(lib_name, 0);
  82.     if (a != NULL) {
  83.         s = dlsym(a, sym_name);
  84.         printf("symbol '%s' = 0x%lx\n", sym_name, (long) s);
  85.     } else {
  86.         printf("failed to dlopen() library '%s'\n", lib_name);
  87.     }
  88.  
  89.     printf("Run dynamically-resolved function '%s'...\n", sym_name);
  90.     fun = (fptr_t) s;
  91.     i = (*fun)();
  92.     printf("Done. (returned 0x%x)\n", i);
  93.    
  94.     return 0;
  95. }
  96.  
  97. /** @}
  98.  */
  99.  
  100.