minix/lib/libc/compat/arch/m68k/gen/compat_setjmp.S

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/* $NetBSD: compat_setjmp.S,v 1.2 2013/07/17 21:29:01 matt Exp $ */
/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* the Systems Programming Group of the University of Utah Computer
* Science Department.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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 <machine/asm.h>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
RCSID("from: @(#)setjmp.s 5.1 (Berkeley) 5/12/90")
#else
RCSID("$NetBSD: compat_setjmp.S,v 1.2 2013/07/17 21:29:01 matt Exp $")
#endif
#endif /* LIBC_SCCS and not lint */
/*
* C library -- setjmp, longjmp
*
* longjmp(a,v)
* will generate a "return(v)" from
* the last call to
* setjmp(a)
* by restoring registers from the stack,
* and a struct sigcontext, see <signal.h>
*/
ENTRY(setjmp)
lea -12(%sp),%sp /* space for sigstack args/rvals */
clrl (%sp) /* don't change it... */
movl %sp,4(%sp) /* ...but return the current val */
jbsr PIC_PLT(_C_LABEL(__sigaltstack14))
/* note: flags returned in sp@(8) */
clrl (%sp) /* don't change mask, just return */
jbsr PIC_PLT(_C_LABEL(sigblock)) /* old value */
movl 8(%sp),%d1 /* old flags value */
andl #1,%d1 /* extract onstack flag */
lea 12(%sp),%sp
movl 4(%sp),%a0 /* save area pointer */
movl %d1,(%a0)+ /* save old onstack value */
movl %d0,(%a0)+ /* save old signal mask */
lea 4(%sp),%a1 /* adjust saved SP since we won't rts */
movl %a1,(%a0)+ /* save old SP */
movl %a6,(%a0)+ /* save old FP */
clrl (%a0)+ /* no AP */
movl (%sp),(%a0)+ /* save old PC */
clrl (%a0)+ /* clean PS */
moveml #0x3CFC,(%a0) /* save remaining non-scratch regs */
clrl %d0 /* return 0 */
rts
END(setjmp)
ENTRY(longjmp)
movl 4(%sp),%a0 /* save area pointer */
tstl 8(%a0) /* ensure non-zero SP */
jeq botch /* oops! */
movl 8(%sp),%d0 /* grab return value */
jne ok /* non-zero ok */
moveq #1,%d0 /* else make non-zero */
ok:
moveml 28(%a0),#0x3CFC /* restore non-scratch regs */
movl %a0,-(%sp) /* let sigreturn */
jbsr PIC_PLT(_C_LABEL(sigreturn)) /* finish for us */
botch:
jbsr PIC_PLT(_C_LABEL(longjmperror))
stop #0
END(longjmp)