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git-svn-id: file:///Users/olsen/Code/migration-svn-zu-git/logical-line-staging/clib2/trunk@14685 87f5fb63-7c3d-0410-a384-fd976d0f7a62
This commit is contained in:
Olaf Barthel
149
library/stdlib_swapstack.c
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149
library/stdlib_swapstack.c
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/*
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* $Id: stdlib_swapstack.c,v 1.1.1.1 2004-07-26 16:32:11 obarthel Exp $
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*
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* :ts=4
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*
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* Portable ISO 'C' (1994) runtime library for the Amiga computer
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* Copyright (c) 2002-2004 by Olaf Barthel <olsen@sourcery.han.de>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Neither the name of Olaf Barthel nor the names of contributors
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* may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _STDLIB_HEADERS_H
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#include "stdlib_headers.h"
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#endif /* _STDLIB_HEADERS_H */
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/****************************************************************************/
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#if defined(__GNUC__)
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/****************************************************************************/
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#if defined(SMALL_DATA)
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#define A4(x) "a4@(" #x ":W)"
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#elif defined(SMALL_DATA32)
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#define A4(x) "a4@(" #x ":L)"
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#else
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#define A4(x) #x
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#endif /* SMALL_DATA */
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/****************************************************************************/
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#ifndef __PPC__
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/****************************************************************************/
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asm(" \n\
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.text \n\
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.even \n\
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\n\
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_LVOStackSwap = -732 \n\
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\n\
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.globl _SysBase \n\
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.globl ___swap_stack_and_call \n\
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\n\
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___swap_stack_and_call: \n\
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\n\
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moveml d2/a2/a3/a6,sp@- \n\
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movel sp@(20),a2 \n\
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movel sp@(24),a3 \n\
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movel "A4(_SysBase)",a6 \n\
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\n\
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movel a2,a0 \n\
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jsr a6@(_LVOStackSwap:W) \n\
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\n\
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jsr a3@ \n\
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movel d0,d2 \n\
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\n\
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movel a2,a0 \n\
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jsr a6@(_LVOStackSwap:W) \n\
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\n\
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movel d2,d0 \n\
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\n\
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moveml sp@+,d2/a2/a3/a6 \n\
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\n\
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rts \n\
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\n\
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");
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/****************************************************************************/
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#else
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/****************************************************************************/
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__asm(" \n\
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\n\
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.text \n\
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.align 2 \n\
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\n\
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.set MainInterface, 632 \n\
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.set IExec_StackSwap, 272 \n\
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\n\
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.globl SysBase \n\
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.globl __swap_stack_and_call \n\
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\n\
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__swap_stack_and_call: \n\
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stwu r1, -32(r1) # Make a stack frame \n\
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mflr r0 \n\
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stw r0, 36(r1) \n\
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stmw r29, 8(r1) # Get us three GPRs \n\
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# r29 will store IExec \n\
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mr r4, r31 # Backup ptr to function to call \n\
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mr r3, r30 # Backup ptr to StackSwapStruct \n\
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\n\
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lis r3, SysBase@ha # Retrieve sysbase pointer \n\
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lwz r3, SysBase@l(r3) \n\
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lwz r29, MainInterface(r3) # Get IExec \n\
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\n\
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addi r3, r29, IExec_StackSwap # StackSwap entry \n\
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mr r4, r30 # StackSwap struct in r4 \n\
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mtlr r3 \n\
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blrl # IExec->StackSwap(r4) \n\
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\n\
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mtlr r31 # Call payload \n\
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blrl \n\
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\n\
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addi r3, r29, IExec_StackSwap # Revert to old stack \n\
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mr r4, r30 \n\
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mtlr r3 \n\
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blrl \n\
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\n\
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lmw r29, 8(r1) # Restore registers \n\
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lwz r0, 36(r1) \n\
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mtlr r0 \n\
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addi r1, r1, 32 # Clean up stack \n\
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\n\
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blr \n\
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\n\
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");
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/****************************************************************************/
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#endif /* __PPC__ */
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/****************************************************************************/
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#endif /* __GNUC__ */
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