| 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 | #include <arch/context_offset.h>
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| 30 | #include <arch/stack.h>
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| 31 |
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| 32 | /**
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| 33 | * Both context_save_arch() and context_restore_arch() are
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| 34 | * leaf-optimized procedures. This kind of optimization
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| 35 | * is very important and prevents any implicit window
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| 36 | * spill/fill/clean traps in these very core kernel
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| 37 | * functions.
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| 38 | */
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| 39 |
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| 40 | .text
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| 41 |
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| 42 | .global context_save_arch
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| 43 | .global context_restore_arch
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| 44 |
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| 45 | .macro CONTEXT_STORE r
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| 46 | stx %sp, [\r + OFFSET_SP]
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| 47 | stx %o7, [\r + OFFSET_PC]
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| 48 | stx %i0, [\r + OFFSET_I0]
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| 49 | stx %i1, [\r + OFFSET_I1]
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| 50 | stx %i2, [\r + OFFSET_I2]
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| 51 | stx %i3, [\r + OFFSET_I3]
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| 52 | stx %i4, [\r + OFFSET_I4]
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| 53 | stx %i5, [\r + OFFSET_I5]
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| 54 | stx %fp, [\r + OFFSET_FP]
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| 55 | stx %i7, [\r + OFFSET_I7]
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| 56 | stx %l0, [\r + OFFSET_L0]
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| 57 | stx %l1, [\r + OFFSET_L1]
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| 58 | stx %l2, [\r + OFFSET_L2]
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| 59 | stx %l3, [\r + OFFSET_L3]
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| 60 | stx %l4, [\r + OFFSET_L4]
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| 61 | stx %l5, [\r + OFFSET_L5]
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| 62 | stx %l6, [\r + OFFSET_L6]
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| 63 | stx %l7, [\r + OFFSET_L7]
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| 64 | rdpr %cleanwin, %g1
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| 65 | stx %g1, [\r + OFFSET_CLEANWIN]
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| 66 | .endm
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| 67 |
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| 68 | .macro CONTEXT_LOAD r
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| 69 | ldx [\r + OFFSET_SP], %sp
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| 70 | ldx [\r + OFFSET_PC], %o7
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| 71 | ldx [\r + OFFSET_I0], %i0
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| 72 | ldx [\r + OFFSET_I1], %i1
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| 73 | ldx [\r + OFFSET_I2], %i2
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| 74 | ldx [\r + OFFSET_I3], %i3
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| 75 | ldx [\r + OFFSET_I4], %i4
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| 76 | ldx [\r + OFFSET_I5], %i5
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| 77 | ldx [\r + OFFSET_FP], %fp
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| 78 | ldx [\r + OFFSET_I7], %i7
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| 79 | ldx [\r + OFFSET_L0], %l0
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| 80 | ldx [\r + OFFSET_L1], %l1
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| 81 | ldx [\r + OFFSET_L2], %l2
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| 82 | ldx [\r + OFFSET_L3], %l3
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| 83 | ldx [\r + OFFSET_L4], %l4
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| 84 | ldx [\r + OFFSET_L5], %l5
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| 85 | ldx [\r + OFFSET_L6], %l6
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| 86 | ldx [\r + OFFSET_L7], %l7
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| 87 | ldx [\r + OFFSET_CLEANWIN], %g1
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| 88 | wrpr %g1, %g0, %cleanwin
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| 89 | .endm
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| 90 |
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| 91 | context_save_arch:
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| 92 | CONTEXT_STORE %o0
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| 93 | retl
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| 94 | mov 1, %o0 ! context_save_arch returns 1
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| 95 |
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| 96 | context_restore_arch:
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| 97 | #
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| 98 | # Flush all active windows.
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| 99 | # This is essential, because CONTEXT_LOAD overwrites
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| 100 | # %sp of CWP - 1 with the value written to %fp of CWP.
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| 101 | # Flushing all active windows mitigates this problem
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| 102 | # as CWP - 1 becomes the overlap window.
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| 103 | #
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| 104 | flushw
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| 105 |
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| 106 | CONTEXT_LOAD %o0
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| 107 | retl
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| 108 | xor %o0, %o0, %o0 ! context_restore_arch returns 0
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