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  1. /*
  2.  * Copyright (c) 2006 Ondrej Palkovsky
  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 libcsparc64 sparc64
  30.  * @ingroup lc
  31.  * @{
  32.  */
  33. /** @file
  34.  *
  35.  */
  36.  
  37. #include <thread.h>
  38. #include <malloc.h>
  39. #include <align.h>
  40.  
  41. /*
  42.  * sparc64 uses thread-local storage data structures, variant II, as described
  43.  * in:
  44.  *  Drepper U.: ELF Handling For Thread-Local Storage, 2005
  45.  */
  46.  
  47. /** Allocate TLS variant II data structures for a thread.
  48.  *
  49.  * Only static model is supported.
  50.  *
  51.  * @param data Pointer to pointer to thread local data. This is actually an
  52.  *  output argument.
  53.  * @param size Size of thread local data.
  54.  * @return Pointer to TCB structure.
  55.  */
  56. tcb_t * __alloc_tls(void **data, size_t size)
  57. {
  58.     tcb_t *tcb;
  59.    
  60.     size = ALIGN_UP(size, &_tls_alignment);
  61.     *data = memalign(&_tls_alignment, sizeof(tcb_t) + size);
  62.  
  63.     tcb = (tcb_t *) (*data + size);
  64.     tcb->self = tcb;
  65.  
  66.     return tcb;
  67. }
  68.  
  69. /** Free TLS variant II data structures of a thread.
  70.  *
  71.  * Only static model is supported.
  72.  *
  73.  * @param tcb Pointer to TCB structure.
  74.  * @param size Size of thread local data.
  75.  */
  76. void __free_tls_arch(tcb_t *tcb, size_t size)
  77. {
  78.     size = ALIGN_UP(size, &_tls_alignment);
  79.     void *start = ((void *) tcb) - size;
  80.     free(start);
  81. }
  82.  
  83. /** @}
  84.  */
  85.