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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 <unistd.h>
  39. #include <fcntl.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.  
  53. int z = 42;
  54.  
  55. void _putint(int i);
  56.  
  57. void test_func(void);
  58. void test_func(void)
  59. {
  60.     int fd, rc;
  61.     char buf[5];
  62.  
  63.     kputint(-1);
  64.     kputint(z);
  65.     printf("Hello, world! (from rtld)\n");
  66.  
  67.     fd = open("/test", O_RDONLY);
  68.     if (fd < 0) { printf("fd<0 ("); _putint(fd); printf(")\n"); }
  69.     fd = 0;
  70.  
  71.     rc = read(fd, &buf, 4);
  72.     //printf(" ->%d\n", rc);
  73.     buf[4]='\0';
  74.     printf(buf);
  75.     getchar();
  76.  
  77.     printf("x\n");
  78.     while(1);
  79.    
  80.     asm (
  81.         "movl $253, %%eax;"
  82.         "int $0x30"
  83.         : /* output */
  84.         : /* input */
  85.         : "%eax","%ecx","%edx" /* all scratch registers clobbered */
  86.     );
  87. }
  88.  
  89.  
  90. void _rtld_main(void)
  91. {
  92.     kputint(-1);
  93.  
  94.     kputint(32);
  95.  
  96.     test_func();
  97.  
  98.     kputint(46);
  99. }
  100.  
  101. /** @}
  102.  */
  103.