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  1. /*
  2.  * Copyright (C) 2005 Jakub Jermar
  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. #ifndef __ia64_CONTEXT_H__
  30. #define __ia64_CONTEXT_H__
  31.  
  32. #include <arch/types.h>
  33. #include <typedefs.h>
  34. #include <align.h>
  35.  
  36. #define STACK_ITEM_SIZE         16
  37. #define STACK_ALIGNMENT         16
  38. #define REGISTER_STACK_ALIGNMENT    8
  39.  
  40. /*
  41.  * context_save() and context_restore() are both leaf procedures.
  42.  * No need to allocate scratch area.
  43.  *
  44.  * One item is put onto the stack to support get_stack_base().
  45.  */
  46. #define SP_DELTA    (0+STACK_ITEM_SIZE)
  47.  
  48. #define PFM_MASK    (~0x3fffffffff)
  49.  
  50. #ifdef context_set
  51. #undef context_set
  52. #endif
  53.  
  54. #define context_set(c, _pc, stack, size)                                \
  55.     (c)->pc = (__address) _pc;                                  \
  56.     (c)->bsp = ((__address) stack) + ALIGN(sizeof(the_t), REGISTER_STACK_ALIGNMENT);        \
  57.     (c)->ar_pfs &= PFM_MASK;                                    \
  58.     (c)->sp = ((__address) stack) + ALIGN((size), STACK_ALIGNMENT) - SP_DELTA;
  59.  
  60. /*
  61.  * Only save registers that must be preserved across
  62.  * function calls.
  63.  */
  64. struct context {
  65.  
  66.     /*
  67.      * Application registers
  68.      */
  69.     __u64 ar_pfs;
  70.     __u64 ar_unat_caller;
  71.     __u64 ar_unat_callee;
  72.     __u64 ar_rsc;
  73.     __address bsp;      /* ar_bsp */
  74.     __u64 ar_rnat;
  75.     __u64 ar_lc;
  76.  
  77.     /*
  78.      * General registers
  79.      */
  80.     __u64 r1;
  81.     __u64 r4;
  82.     __u64 r5;
  83.     __u64 r6;
  84.     __u64 r7;
  85.     __address sp;       /* r12 */
  86.     __u64 r13;
  87.    
  88.     /*
  89.      * Branch registers
  90.      */
  91.     __address pc;       /* b0 */
  92.     __u64 b1;
  93.     __u64 b2;
  94.     __u64 b3;
  95.     __u64 b4;
  96.     __u64 b5;
  97.  
  98.     /*
  99.      * Predicate registers
  100.      */
  101.     __u64 pr;
  102.    
  103.     ipl_t ipl;
  104. } __attribute__ ((packed));
  105.  
  106. #endif
  107.