0,0 → 1,110 |
# |
# Copyright (c) 2006 Martin Decky |
# 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. |
# |
|
.text |
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.global context_save |
.global context_restore |
|
#include <libarch/regname.h> |
#include <libarch/context_offset.h> |
|
.macro CONTEXT_STORE r |
stw sp, OFFSET_SP(\r) |
stw r2, OFFSET_R2(\r) |
stw r13, OFFSET_R13(\r) |
stw r14, OFFSET_R14(\r) |
stw r15, OFFSET_R15(\r) |
stw r16, OFFSET_R16(\r) |
stw r17, OFFSET_R17(\r) |
stw r18, OFFSET_R18(\r) |
stw r19, OFFSET_R19(\r) |
stw r20, OFFSET_R20(\r) |
stw r21, OFFSET_R21(\r) |
stw r22, OFFSET_R22(\r) |
stw r23, OFFSET_R23(\r) |
stw r24, OFFSET_R24(\r) |
stw r25, OFFSET_R25(\r) |
stw r26, OFFSET_R26(\r) |
stw r27, OFFSET_R27(\r) |
stw r28, OFFSET_R28(\r) |
stw r29, OFFSET_R29(\r) |
stw r30, OFFSET_R30(\r) |
stw r31, OFFSET_R31(\r) |
.endm |
|
.macro CONTEXT_LOAD r |
lwz sp, OFFSET_SP(\r) |
lwz r2, OFFSET_R2(\r) |
lwz r13, OFFSET_R13(\r) |
lwz r14, OFFSET_R14(\r) |
lwz r15, OFFSET_R15(\r) |
lwz r16, OFFSET_R16(\r) |
lwz r17, OFFSET_R17(\r) |
lwz r18, OFFSET_R18(\r) |
lwz r19, OFFSET_R19(\r) |
lwz r20, OFFSET_R20(\r) |
lwz r21, OFFSET_R21(\r) |
lwz r22, OFFSET_R22(\r) |
lwz r23, OFFSET_R23(\r) |
lwz r24, OFFSET_R24(\r) |
lwz r25, OFFSET_R25(\r) |
lwz r26, OFFSET_R26(\r) |
lwz r27, OFFSET_R27(\r) |
lwz r28, OFFSET_R28(\r) |
lwz r29, OFFSET_R29(\r) |
lwz r30, OFFSET_R30(\r) |
lwz r31, OFFSET_R31(\r) |
.endm |
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context_save: |
CONTEXT_STORE r3 |
|
mflr r4 |
stw r4, OFFSET_PC(r3) |
|
mfcr r4 |
stw r4, OFFSET_CR(r3) |
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# context_save returns 1 |
li r3, 1 |
blr |
|
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context_restore: |
CONTEXT_LOAD r3 |
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lwz r4, OFFSET_CR(r3) |
mtcr r4 |
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lwz r4, OFFSET_PC(r3) |
mtlr r4 |
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# context_restore returns 0 |
li r3, 0 |
blr |