0,0 → 1,84 |
# |
# Copyright (C) 2005 Jakub Jermar |
# All rights reserved. |
# |
# Redistribution and use in source and binary forms, with or without |
# modification, are permitted provided that the following conditions |
# are met: |
# |
# - Redistributions of source code must retain the above copyright |
# notice, this list of conditions and the following disclaimer. |
# - Redistributions in binary form must reproduce the above copyright |
# notice, this list of conditions and the following disclaimer in the |
# documentation and/or other materials provided with the distribution. |
# - The name of the author may not be used to endorse or promote products |
# derived from this software without specific prior written permission. |
# |
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
# |
|
#include <arch/context_offset.h> |
#include <arch/stack.h> |
|
/** |
* Both context_save_arch() and context_restore_arch() are |
* leaf-optimized procedures. This kind of optimization |
* is very important and prevents any implicit window |
* spill/fill/clean traps in these very core kernel |
* functions. |
*/ |
|
.text |
|
.global context_save_arch |
.global context_restore_arch |
|
.macro CONTEXT_STORE r |
stx %o1, [\r + OFFSET_O1] |
stx %o2, [\r + OFFSET_O2] |
stx %o3, [\r + OFFSET_O3] |
stx %o4, [\r + OFFSET_O4] |
stx %o5, [\r + OFFSET_O5] |
stx %o7, [\r + OFFSET_PC] |
stx %sp, [\r + OFFSET_SP] |
stx %fp, [\r + OFFSET_FP] |
.endm |
|
.macro CONTEXT_LOAD r |
ldx [\r + OFFSET_O1], %o1 |
ldx [\r + OFFSET_O2], %o2 |
ldx [\r + OFFSET_O3], %o3 |
ldx [\r + OFFSET_O4], %o4 |
ldx [\r + OFFSET_O5], %o5 |
ldx [\r + OFFSET_PC], %o7 |
ldx [\r + OFFSET_SP], %sp |
ldx [\r + OFFSET_FP], %fp |
.endm |
|
context_save_arch: |
CONTEXT_STORE %o0 |
retl |
mov 1, %o0 ! context_save_arch returns 1 |
|
context_restore_arch: |
# |
# Flush all active windows. |
# This is essential, because CONTEXT_LOAD overwrites |
# %sp of CWP - 1 with the value written to %fp of CWP. |
# Flushing all active windows mitigates this problem |
# as CWP - 1 becomes the overlap window. |
# |
flushw |
|
CONTEXT_LOAD %o0 |
retl |
xor %o0, %o0, %o0 ! context_restore_arch returns 0 |