57 lines
2.0 KiB
ArmAsm
57 lines
2.0 KiB
ArmAsm
/**
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* \file
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* <!--
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* This file is part of BeRTOS.
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*
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* Bertos is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* As a special exception, you may use this file as part of a free software
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* library without restriction. Specifically, if other files instantiate
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* templates or use macros or inline functions from this file, or you compile
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* this file and link it with other files to produce an executable, this
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* file does not by itself cause the resulting executable to be covered by
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* the GNU General Public License. This exception does not however
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* invalidate any other reasons why the executable file might be covered by
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* the GNU General Public License.
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*
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* Copyright 2008 Bernie Innocenti <bernie@codewiz.org>
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* -->
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*
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* \author Bernie Innocenti <bernie@codewiz.org>
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*
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* \brief PowerPC context switch
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*/
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#ifdef __APPLE__
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//This workaround is necessary to compile under OS X assembler.
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#define SWITCH_CONTEXT _asm_switch_context
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#else
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#define SWITCH_CONTEXT asm_switch_context
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#endif
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.balign 4
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/* void asm_switch_context(void ** new_sp, void ** save_sp) */
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/* r3 r4 */
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.globl SWITCH_CONTEXT
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SWITCH_CONTEXT:
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mflr 0 /* r0 = lr */
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stw 0,8(1) /* store lr at *(sp+8) */
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stw 1,0(4) /* *save_sp = sp */
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lwz 1,0(3) /* sp = *new_sp */
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lwz 0,8(1) /* retrieve lr from *(sp+8) */
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mtlr 0 /* lr = r0 */
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blr /* return */
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