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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 <sys/types.h>
  38. #include <align.h>
  39. #include <tls.h>
  40.  
  41. void _putint(int i);
  42. /* FIXME */
  43. void __udivdi3(void);
  44. void __umoddi3(void);
  45.  
  46. static void kputint(unsigned i)
  47. {
  48.     unsigned dummy;
  49.     asm volatile (
  50.         "movl $30, %%eax;"
  51.         "int $0x30"
  52.         : "=d" (dummy) /* output - %edx clobbered */
  53.         : "d" (i) /* input */
  54.         : "%eax","%ecx" /* all scratch registers clobbered */
  55.     ); 
  56. }
  57.  
  58. typedef struct {
  59.     unsigned long int ti_module;
  60.     unsigned long int ti_offset;
  61. } tls_index;
  62.  
  63. void __attribute__ ((__regparm__ (1)))
  64.     *___tls_get_addr(tls_index *ti);
  65.  
  66. void __attribute__ ((__regparm__ (1)))
  67.     *___tls_get_addr(tls_index *ti)
  68. {
  69.     size_t tls_size;
  70.     uint8_t *tls;
  71.  
  72.     /* Calculate size of TLS block */
  73.     tls_size = ALIGN_UP(&_tbss_end - &_tdata_start, &_tls_alignment);
  74.  
  75.     /* The TLS block is just before TCB */
  76.     tls = (uint8_t *)__tcb_get() - tls_size;
  77.  
  78.     return tls + ti->ti_offset;
  79. }
  80.  
  81. void __umoddi3(void)
  82. {
  83.     kputint(0x101);
  84.     *(int *)0 = 0;  /* cause a page fault */
  85. }
  86.  
  87. void __udivdi3(void)
  88. {
  89.     kputint(0x102);
  90.     *(int *)0 = 0;  /* cause a page fault */
  91. }
  92.  
  93. void _putint(int i)
  94. {
  95. }
  96.  
  97. /** @}
  98.  */
  99.