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