| 1 | /*
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| 2 | * Copyright (C) 2005 Jakub Jermar
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | #ifndef __ia64_CONTEXT_H__
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| 30 | #define __ia64_CONTEXT_H__
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| 31 |
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| 32 | #include <arch/types.h>
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| 33 | #include <typedefs.h>
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| 34 | #include <align.h>
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| 35 |
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| 36 | #define STACK_ITEM_SIZE 16
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| 37 | #define STACK_ALIGNMENT 16
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| 38 | #define REGISTER_STACK_ALIGNMENT 8
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| 39 |
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| 40 | /*
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| 41 | * context_save() and context_restore() are both leaf procedures.
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| 42 | * No need to allocate scratch area.
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| 43 | *
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| 44 | * One item is put onto the stack to support get_stack_base().
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| 45 | */
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| 46 | #define SP_DELTA (0+STACK_ITEM_SIZE)
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| 47 |
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| 48 | #define PFM_MASK (~0x3fffffffff)
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| 49 |
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| 50 | #ifdef context_set
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| 51 | #undef context_set
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| 52 | #endif
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| 53 |
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| 54 | #define context_set(c, _pc, stack, size) \
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| 55 | (c)->pc = (__address) _pc; \
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| 56 | (c)->bsp = ((__address) stack) + ALIGN(sizeof(the_t), REGISTER_STACK_ALIGNMENT); \
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| 57 | (c)->ar_pfs &= PFM_MASK; \
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| 58 | (c)->sp = ((__address) stack) + ALIGN((size), STACK_ALIGNMENT) - SP_DELTA;
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| 59 |
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| 60 | /*
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| 61 | * Only save registers that must be preserved across
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| 62 | * function calls.
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| 63 | */
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| 64 | struct context {
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| 65 |
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| 66 | /*
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| 67 | * Application registers
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| 68 | */
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| 69 | __u64 ar_pfs;
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| 70 | __u64 ar_unat_caller;
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| 71 | __u64 ar_unat_callee;
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| 72 | __u64 ar_rsc;
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| 73 | __address bsp; /* ar_bsp */
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| 74 | __u64 ar_rnat;
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| 75 | __u64 ar_lc;
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| 76 |
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| 77 | /*
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| 78 | * General registers
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| 79 | */
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| 80 | __u64 r1;
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| 81 | __u64 r4;
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| 82 | __u64 r5;
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| 83 | __u64 r6;
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| 84 | __u64 r7;
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| 85 | __address sp; /* r12 */
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| 86 | __u64 r13;
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| 87 |
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| 88 | /*
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| 89 | * Branch registers
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| 90 | */
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| 91 | __address pc; /* b0 */
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| 92 | __u64 b1;
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| 93 | __u64 b2;
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| 94 | __u64 b3;
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| 95 | __u64 b4;
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| 96 | __u64 b5;
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| 97 |
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| 98 | /*
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| 99 | * Predicate registers
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| 100 | */
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| 101 | __u64 pr;
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| 102 |
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| 103 | ipl_t ipl;
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| 104 | } __attribute__ ((packed));
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| 105 |
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| 106 | #endif
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