| 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 <abi/asmtool.h>
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| 30 | #include <libarch/fibril_context.h>
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| 31 |
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| 32 | .text
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| 33 |
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| 34 | FUNCTION_BEGIN(__context_save)
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| 35 | #
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| 36 | # We rely on the kernel to flush our active register windows to memory
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| 37 | # should a thread switch occur.
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| 38 | #
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| 39 | stx %sp, [%o0 + __CONTEXT_OFFSET_SP]
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| 40 | stx %o7, [%o0 + __CONTEXT_OFFSET_PC]
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| 41 | stx %i0, [%o0 + __CONTEXT_OFFSET_I0]
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| 42 | stx %i1, [%o0 + __CONTEXT_OFFSET_I1]
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| 43 | stx %i2, [%o0 + __CONTEXT_OFFSET_I2]
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| 44 | stx %i3, [%o0 + __CONTEXT_OFFSET_I3]
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| 45 | stx %i4, [%o0 + __CONTEXT_OFFSET_I4]
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| 46 | stx %i5, [%o0 + __CONTEXT_OFFSET_I5]
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| 47 | stx %fp, [%o0 + __CONTEXT_OFFSET_FP]
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| 48 | stx %i7, [%o0 + __CONTEXT_OFFSET_I7]
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| 49 | stx %l0, [%o0 + __CONTEXT_OFFSET_L0]
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| 50 | stx %l1, [%o0 + __CONTEXT_OFFSET_L1]
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| 51 | stx %l2, [%o0 + __CONTEXT_OFFSET_L2]
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| 52 | stx %l3, [%o0 + __CONTEXT_OFFSET_L3]
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| 53 | stx %l4, [%o0 + __CONTEXT_OFFSET_L4]
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| 54 | stx %l5, [%o0 + __CONTEXT_OFFSET_L5]
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| 55 | stx %l6, [%o0 + __CONTEXT_OFFSET_L6]
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| 56 | stx %l7, [%o0 + __CONTEXT_OFFSET_L7]
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| 57 | stx %g7, [%o0 + __CONTEXT_OFFSET_TP]
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| 58 | retl
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| 59 | mov 0, %o0 ! __context_save returns 0
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| 60 | FUNCTION_END(__context_save)
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| 61 |
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| 62 | FUNCTION_BEGIN(__context_restore)
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| 63 | #
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| 64 | # Flush all active windows.
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| 65 | # This is essential, because CONTEXT_RESTORE_ARCH_CORE overwrites %sp of
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| 66 | # CWP - 1 with the value written to %fp of CWP. Flushing all active
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| 67 | # windows mitigates this problem as CWP - 1 becomes the overlap window.
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| 68 | #
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| 69 | flushw
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| 70 |
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| 71 | ldx [%o0 + __CONTEXT_OFFSET_SP], %sp
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| 72 | ldx [%o0 + __CONTEXT_OFFSET_PC], %o7
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| 73 | ldx [%o0 + __CONTEXT_OFFSET_I0], %i0
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| 74 | ldx [%o0 + __CONTEXT_OFFSET_I1], %i1
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| 75 | ldx [%o0 + __CONTEXT_OFFSET_I2], %i2
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| 76 | ldx [%o0 + __CONTEXT_OFFSET_I3], %i3
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| 77 | ldx [%o0 + __CONTEXT_OFFSET_I4], %i4
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| 78 | ldx [%o0 + __CONTEXT_OFFSET_I5], %i5
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| 79 | ldx [%o0 + __CONTEXT_OFFSET_FP], %fp
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| 80 | ldx [%o0 + __CONTEXT_OFFSET_I7], %i7
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| 81 | ldx [%o0 + __CONTEXT_OFFSET_L0], %l0
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| 82 | ldx [%o0 + __CONTEXT_OFFSET_L1], %l1
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| 83 | ldx [%o0 + __CONTEXT_OFFSET_L2], %l2
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| 84 | ldx [%o0 + __CONTEXT_OFFSET_L3], %l3
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| 85 | ldx [%o0 + __CONTEXT_OFFSET_L4], %l4
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| 86 | ldx [%o0 + __CONTEXT_OFFSET_L5], %l5
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| 87 | ldx [%o0 + __CONTEXT_OFFSET_L6], %l6
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| 88 | ldx [%o0 + __CONTEXT_OFFSET_L7], %l7
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| 89 | ldx [%o0 + __CONTEXT_OFFSET_TP], %g7
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| 90 | retl
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| 91 | mov %o1, %o0 ! __context_restore returns second argument
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| 92 | FUNCTION_END(__context_restore)
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