Factor out the common (to all m68k ports) sigreturn routine.
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sys/arch/m68k/m68k/sigreturn.s
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87
sys/arch/m68k/m68k/sigreturn.s
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/* $NetBSD: sigreturn.s,v 1.1 1996/01/31 02:22:15 thorpej Exp $ */
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/*
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* Copyright (c) 1988 University of Utah.
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* Copyright (c) 1980, 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* the Systems Programming Group of the University of Utah Computer
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* Science Department.
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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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* 1. 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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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* 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 REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: Utah $Hdr: locore.s 1.66 92/12/22$
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*
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* @(#)locore.s 8.6 (Berkeley) 5/27/94
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*/
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/*
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* NOTICE: This is not a standalone file. To use it, #include it in
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* your port's locore.s, like so:
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*
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* #include <m68k/m68k/sigreturn.s>
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*/
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/*
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* The sigreturn() syscall comes here. It requires special handling
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* because we must open a hole in the stack to fill in the (possibly much
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* larger) original stack frame.
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*/
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sigreturn:
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lea sp@(-84),sp | leave enough space for largest frame
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movl sp@(84),sp@ | move up current 8 byte frame
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movl sp@(88),sp@(4)
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movl #84,sp@- | default: adjust by 84 bytes
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moveml #0xFFFF,sp@- | save user registers
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movl usp,a0 | save the user SP
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movl a0,sp@(FR_SP) | in the savearea
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movl #SYS_sigreturn,sp@- | push syscall number
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jbsr _syscall | handle it
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addql #4,sp | pop syscall#
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movl sp@(FR_SP),a0 | grab and restore
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movl a0,usp | user SP
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lea sp@(FR_HW),a1 | pointer to HW frame
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movw sp@(FR_ADJ),d0 | do we need to adjust the stack?
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jeq Lsigr1 | no, just continue
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moveq #92,d1 | total size
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subw d0,d1 | - hole size = frame size
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lea a1@(92),a0 | destination
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addw d1,a1 | source
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lsrw #1,d1 | convert to word count
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subqw #1,d1 | minus 1 for dbf
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Lsigrlp:
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movw a1@-,a0@- | copy a word
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dbf d1,Lsigrlp | continue
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movl a0,a1 | new HW frame base
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Lsigr1:
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movl a1,sp@(FR_SP) | new SP value
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moveml sp@+,#0x7FFF | restore user registers
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movl sp@,sp | and our SP
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jra rei | all done
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