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