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  1. /*
  2.  * Copyright (c) 2007 Pavel Jancik
  3.  * Copyright (c) 2007 Michal Kebrt
  4.  * All rights reserved.
  5.  *
  6.  * Redistribution and use in source and binary forms, with or without
  7.  * modification, are permitted provided that the following conditions
  8.  * are met:
  9.  *
  10.  * - Redistributions of source code must retain the above copyright
  11.  *   notice, this list of conditions and the following disclaimer.
  12.  * - Redistributions in binary form must reproduce the above copyright
  13.  *   notice, this list of conditions and the following disclaimer in the
  14.  *   documentation and/or other materials provided with the distribution.
  15.  * - The name of the author may not be used to endorse or promote products
  16.  *   derived from this software without specific prior written permission.
  17.  *
  18.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  19.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  20.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  21.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  22.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  23.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  24.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  25.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  27.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28.  */
  29.  
  30. /** @addtogroup libcarm32
  31.  * @{
  32.  */
  33. /** @file
  34.  */
  35.  
  36. #ifndef LIBC_arm32_TLS_H_
  37. #define LIBC_arm32_TLS_H_
  38.  
  39. #include <sys/types.h>
  40.  
  41. #define CONFIG_TLS_VARIANT_1
  42.  
  43. /** Offsets for accessing thread-local variables are shifted 8 bytes higher. */
  44. #define ARM_TP_OFFSET  (-8)
  45.  
  46. /** TCB (Thread Control Block) struct.
  47.  *
  48.  *  TLS starts just after this struct.
  49.  */
  50. typedef struct {
  51.     /** Fibril data. */
  52.     void *fibril_data;
  53. } tcb_t;
  54.  
  55.  
  56. /** Sets TLS address to the r9 register.
  57.  *
  58.  *  @param tcb      TCB (TLS starts behind)
  59.  */
  60. static inline void __tcb_set(tcb_t *tcb)
  61. {
  62.     void *tls = (void *) tcb;
  63.     tls += sizeof(tcb_t) + ARM_TP_OFFSET;
  64.     asm volatile (
  65.         "mov r9, %0"
  66.         :
  67.         : "r" (tls)
  68.     );
  69. }
  70.  
  71.  
  72. /** Returns TCB address.
  73.  *
  74.  * @return      TCB address (starts before TLS which address is stored
  75.  *          in r9 register).
  76.  */
  77. static inline tcb_t *__tcb_get(void)
  78. {
  79.     void *ret;
  80.     asm volatile (
  81.         "mov %0, r9"
  82.         : "=r"(ret)
  83.     );
  84.     return (tcb_t *) (ret - ARM_TP_OFFSET - sizeof(tcb_t));
  85. }
  86.  
  87.  
  88. /** Returns TLS address stored.
  89.  *
  90.  *  Implemented in assembly.
  91.  *
  92.  *  @return     TLS address stored in r9 register
  93.  */
  94. extern uintptr_t __aeabi_read_tp(void);
  95.  
  96. #endif
  97.  
  98. /** @}
  99.  */
  100.