| 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 | #include <libarch/fibril_context.h>
|
|---|
| 30 |
|
|---|
| 31 | .text
|
|---|
| 32 |
|
|---|
| 33 | .global context_save
|
|---|
| 34 | .global context_restore
|
|---|
| 35 |
|
|---|
| 36 | context_save:
|
|---|
| 37 | #
|
|---|
| 38 | # We rely on the kernel to flush our active register windows to memory
|
|---|
| 39 | # should a thread switch occur.
|
|---|
| 40 | #
|
|---|
| 41 | stx %sp, [%o0 + CONTEXT_OFFSET_SP]
|
|---|
| 42 | stx %o7, [%o0 + CONTEXT_OFFSET_PC]
|
|---|
| 43 | stx %i0, [%o0 + CONTEXT_OFFSET_I0]
|
|---|
| 44 | stx %i1, [%o0 + CONTEXT_OFFSET_I1]
|
|---|
| 45 | stx %i2, [%o0 + CONTEXT_OFFSET_I2]
|
|---|
| 46 | stx %i3, [%o0 + CONTEXT_OFFSET_I3]
|
|---|
| 47 | stx %i4, [%o0 + CONTEXT_OFFSET_I4]
|
|---|
| 48 | stx %i5, [%o0 + CONTEXT_OFFSET_I5]
|
|---|
| 49 | stx %fp, [%o0 + CONTEXT_OFFSET_FP]
|
|---|
| 50 | stx %i7, [%o0 + CONTEXT_OFFSET_I7]
|
|---|
| 51 | stx %l0, [%o0 + CONTEXT_OFFSET_L0]
|
|---|
| 52 | stx %l1, [%o0 + CONTEXT_OFFSET_L1]
|
|---|
| 53 | stx %l2, [%o0 + CONTEXT_OFFSET_L2]
|
|---|
| 54 | stx %l3, [%o0 + CONTEXT_OFFSET_L3]
|
|---|
| 55 | stx %l4, [%o0 + CONTEXT_OFFSET_L4]
|
|---|
| 56 | stx %l5, [%o0 + CONTEXT_OFFSET_L5]
|
|---|
| 57 | stx %l6, [%o0 + CONTEXT_OFFSET_L6]
|
|---|
| 58 | stx %l7, [%o0 + CONTEXT_OFFSET_L7]
|
|---|
| 59 | stx %g7, [%o0 + CONTEXT_OFFSET_TP]
|
|---|
| 60 | retl
|
|---|
| 61 | mov 1, %o0 ! context_save_arch returns 1
|
|---|
| 62 |
|
|---|
| 63 | context_restore:
|
|---|
| 64 | #
|
|---|
| 65 | # Flush all active windows.
|
|---|
| 66 | # This is essential, because CONTEXT_RESTORE_ARCH_CORE overwrites %sp of
|
|---|
| 67 | # CWP - 1 with the value written to %fp of CWP. Flushing all active
|
|---|
| 68 | # windows mitigates this problem as CWP - 1 becomes the overlap window.
|
|---|
| 69 | #
|
|---|
| 70 | flushw
|
|---|
| 71 |
|
|---|
| 72 | ldx [%o0 + CONTEXT_OFFSET_SP], %sp
|
|---|
| 73 | ldx [%o0 + CONTEXT_OFFSET_PC], %o7
|
|---|
| 74 | ldx [%o0 + CONTEXT_OFFSET_I0], %i0
|
|---|
| 75 | ldx [%o0 + CONTEXT_OFFSET_I1], %i1
|
|---|
| 76 | ldx [%o0 + CONTEXT_OFFSET_I2], %i2
|
|---|
| 77 | ldx [%o0 + CONTEXT_OFFSET_I3], %i3
|
|---|
| 78 | ldx [%o0 + CONTEXT_OFFSET_I4], %i4
|
|---|
| 79 | ldx [%o0 + CONTEXT_OFFSET_I5], %i5
|
|---|
| 80 | ldx [%o0 + CONTEXT_OFFSET_FP], %fp
|
|---|
| 81 | ldx [%o0 + CONTEXT_OFFSET_I7], %i7
|
|---|
| 82 | ldx [%o0 + CONTEXT_OFFSET_L0], %l0
|
|---|
| 83 | ldx [%o0 + CONTEXT_OFFSET_L1], %l1
|
|---|
| 84 | ldx [%o0 + CONTEXT_OFFSET_L2], %l2
|
|---|
| 85 | ldx [%o0 + CONTEXT_OFFSET_L3], %l3
|
|---|
| 86 | ldx [%o0 + CONTEXT_OFFSET_L4], %l4
|
|---|
| 87 | ldx [%o0 + CONTEXT_OFFSET_L5], %l5
|
|---|
| 88 | ldx [%o0 + CONTEXT_OFFSET_L6], %l6
|
|---|
| 89 | ldx [%o0 + CONTEXT_OFFSET_L7], %l7
|
|---|
| 90 | ldx [%o0 + CONTEXT_OFFSET_TP], %g7
|
|---|
| 91 | retl
|
|---|
| 92 | xor %o0, %o0, %o0 ! context_restore_arch returns 0
|
|---|
