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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.  /** @addtogroup libcia64  
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #ifndef __LIBC__ia64PSTHREAD_H__
  36. #define __LIBC__ia64PSTHREAD_H__
  37.  
  38. #include <types.h>
  39. #include <align.h>
  40. #include <libarch/stack.h>
  41.  
  42. /*
  43.  * context_save() and context_restore() are both leaf procedures.
  44.  * No need to allocate scratch area.
  45.  */
  46. #define SP_DELTA    (0+ALIGN_UP(STACK_ITEM_SIZE, STACK_ALIGNMENT))
  47.  
  48. #define PFM_MASK        (~0x3fffffffff)
  49.  
  50. #define PSTHREAD_INITIAL_STACK_PAGES_NO 2
  51. /* Stack is divided into two equal parts (for memory stack and register stack). */
  52. #define PSTHREAD_INITIAL_STACK_DIVISION 2  
  53.  
  54. #ifdef context_set
  55. #undef context_set
  56. #endif
  57.  
  58. #define context_set(c, _pc, stack, size, tls)                               \
  59.     do {                                                \
  60.         (c)->pc = (uint64_t) _pc;                               \
  61.         (c)->bsp = ((uint64_t) stack) + size / PSTHREAD_INITIAL_STACK_DIVISION;                             \
  62.         (c)->ar_pfs &= PFM_MASK;                                \
  63.         (c)->sp = ((uint64_t) stack) + ALIGN_UP((size / PSTHREAD_INITIAL_STACK_DIVISION), STACK_ALIGNMENT) - SP_DELTA;      \
  64.         (c)->tp = (uint64_t) tls;                               \
  65.     } while (0);
  66.    
  67.  
  68. /*
  69.  * Only save registers that must be preserved across
  70.  * function calls.
  71.  */
  72. typedef struct context {
  73.  
  74.     /*
  75.      * Application registers
  76.      */
  77.     uint64_t ar_pfs;
  78.     uint64_t ar_unat_caller;
  79.     uint64_t ar_unat_callee;
  80.     uint64_t ar_rsc;
  81.     uint64_t bsp;       /* ar_bsp */
  82.     uint64_t ar_rnat;
  83.     uint64_t ar_lc;
  84.  
  85.     /*
  86.      * General registers
  87.      */
  88.     uint64_t r1;
  89.     uint64_t r4;
  90.     uint64_t r5;
  91.     uint64_t r6;
  92.     uint64_t r7;
  93.     uint64_t sp;        /* r12 */
  94.     uint64_t tp;        /* r13 */
  95.    
  96.     /*
  97.      * Branch registers
  98.      */
  99.     uint64_t pc;        /* b0 */
  100.     uint64_t b1;
  101.     uint64_t b2;
  102.     uint64_t b3;
  103.     uint64_t b4;
  104.     uint64_t b5;
  105.  
  106.     /*
  107.      * Predicate registers
  108.      */
  109.     uint64_t pr;
  110. } context_t;
  111.  
  112. #endif
  113.  
  114.  /** @}
  115.  */
  116.  
  117.