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  1. /*
  2.  * Copyright (c) 2007 Michal Kebrt
  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 libcarm32  
  30.  * @{
  31.  */
  32. /** @file
  33.  *  @brief Fibrils related declarations.
  34.  */
  35.  
  36. #ifndef LIBC_arm32_FIBRIL_H_
  37. #define LIBC_arm32_FIBRIL_H_
  38.  
  39. #include <sys/types.h>
  40. #include <align.h>
  41. #include <thread.h>
  42.  
  43. /** Size of a stack item */
  44. #define STACK_ITEM_SIZE     4
  45.  
  46. /** Stack alignment - see <a href="http://www.arm.com/support/faqdev/14269.html">ABI</a> for details */
  47. #define STACK_ALIGNMENT     8
  48.  
  49. #define SP_DELTA    (0 + ALIGN_UP(STACK_ITEM_SIZE, STACK_ALIGNMENT))
  50.  
  51.  
  52. /** Sets data to the context.
  53.  *  
  54.  *  @param c     Context (#context_t).
  55.  *  @param _pc   Program counter.
  56.  *  @param stack Stack address.
  57.  *  @param size  Stack size.
  58.  *  @param ptls  Pointer to the TCB.
  59.  */
  60. #define context_set(c, _pc, stack, size, ptls)          \
  61.     (c)->pc = (sysarg_t) (_pc);             \
  62.     (c)->sp = ((sysarg_t) (stack)) + (size) - SP_DELTA;     \
  63.         (c)->tls = ((sysarg_t)(ptls)) + sizeof(tcb_t) + ARM_TP_OFFSET;
  64.  
  65.  
  66. /** Fibril context.
  67.  *
  68.  *  Only registers preserved accross function calls are included. r9 is used
  69.  *  to store a TLS address. -ffixed-r9 gcc forces gcc not to use this
  70.  *  register. -mtp=soft forces gcc to use #__aeabi_read_tp to obtain
  71.  *  TLS address.
  72.  */
  73. typedef struct  {
  74.     uint32_t sp;
  75.     uint32_t pc;
  76.     uint32_t r4;
  77.     uint32_t r5;
  78.     uint32_t r6;
  79.     uint32_t r7;
  80.     uint32_t r8;
  81.     uint32_t tls;
  82.     uint32_t r10;
  83.     uint32_t r11;
  84. } context_t;
  85.  
  86.  
  87. #endif
  88.  
  89. /** @}
  90.  */
  91.