sparc/gen/_setjmp.S

1.4  christos /*	$NetBSD: _setjmp.S,v 1.4 1997/07/16 14:37:39 christos Exp $	*/
1.4  christos
1.1       cgd /*
1.1       cgd  * Copyright (c) 1992, 1993
1.1       cgd  *	The Regents of the University of California.  All rights reserved.
1.1       cgd  *
1.1       cgd  * This software was developed by the Computer Systems Engineering group
1.1       cgd  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
1.1       cgd  * contributed to Berkeley.
1.1       cgd  *
1.1       cgd  * Redistribution and use in source and binary forms, with or without
1.1       cgd  * modification, are permitted provided that the following conditions
1.1       cgd  * are met:
1.1       cgd  * 1. Redistributions of source code must retain the above copyright
1.1       cgd  *    notice, this list of conditions and the following disclaimer.
1.1       cgd  * 2. Redistributions in binary form must reproduce the above copyright
1.1       cgd  *    notice, this list of conditions and the following disclaimer in the
1.1       cgd  *    documentation and/or other materials provided with the distribution.
1.1       cgd  * 3. All advertising materials mentioning features or use of this software
1.1       cgd  *    must display the following acknowledgement:
1.1       cgd  *	This product includes software developed by the University of
1.1       cgd  *	California, Berkeley and its contributors.
1.1       cgd  * 4. Neither the name of the University nor the names of its contributors
1.1       cgd  *    may be used to endorse or promote products derived from this software
1.1       cgd  *    without specific prior written permission.
1.1       cgd  *
1.1       cgd  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
1.1       cgd  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
1.1       cgd  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
1.1       cgd  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
1.1       cgd  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
1.1       cgd  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
1.1       cgd  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
1.1       cgd  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
1.1       cgd  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
1.1       cgd  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
1.1       cgd  * SUCH DAMAGE.
1.1       cgd  *
1.1       cgd  * from: Header: _setjmp.s,v 1.1 91/07/06 16:45:53 torek Exp
1.1       cgd  */
1.1       cgd
1.4  christos #include <machine/asm.h>
1.1       cgd #if defined(LIBC_SCCS) && !defined(lint)
1.4  christos #if 0
1.1       cgd 	.asciz "@(#)_setjmp.s	8.1 (Berkeley) 6/4/93"
1.4  christos #else
1.4  christos 	RCSID("$NetBSD: _setjmp.S,v 1.4 1997/07/16 14:37:39 christos Exp $")
1.4  christos #endif
1.1       cgd #endif /* LIBC_SCCS and not lint */
1.1       cgd
1.1       cgd /*
1.1       cgd  * C library -- _setjmp, _longjmp
1.1       cgd  *
1.1       cgd  *	_longjmp(a,v)
1.1       cgd  * will generate a "return(v?v:1)" from
1.1       cgd  * the last call to
1.1       cgd  *	_setjmp(a)
1.1       cgd  * by unwinding the call stack.
1.1       cgd  * The previous signal state is NOT restored.
1.1       cgd  */
1.1       cgd
1.1       cgd ENTRY(_setjmp)
1.2        pk 	st	%sp, [%o0+0]	/* store caller's stack pointer */
1.2        pk 	st	%o7, [%o0+4]	/* ... return pc */
1.2        pk 	st	%fp, [%o0+8]	/* ... and frame pointer */
1.1       cgd 	retl
1.1       cgd 	 clr	%o0		! return 0
1.1       cgd
1.1       cgd ENTRY(_longjmp)
1.1       cgd 	addcc	%o1, %g0, %g6	! compute v ? v : 1 in a global register
1.1       cgd 	be,a	0f
1.1       cgd 	 mov	1, %g6
1.1       cgd 0:
1.1       cgd 	mov	%o0, %g1	! save a in another global register
1.1       cgd 	ld	[%g1+8], %g7	/* get caller's frame */
1.1       cgd 1:
1.1       cgd 	cmp	%fp, %g7	! compare against desired frame
1.1       cgd 	bl,a	1b		! if below,
1.1       cgd 	 restore		!    pop frame and loop
1.1       cgd 	be,a	2f		! if there,
1.2        pk 	 ld	[%g1+0], %o2	!    fetch return %sp
1.1       cgd
1.1       cgd Lbotch:
1.1       cgd 	call	_longjmperror	! otherwise, went too far; bomb out
1.1       cgd 	nop
1.1       cgd 	unimp	0
1.1       cgd
1.1       cgd 2:
1.1       cgd 	cmp	%o2, %sp	! %sp must not decrease
1.1       cgd 	bge,a	3f
1.1       cgd 	 mov	%o2, %sp	! it is OK, put it in place
1.1       cgd 	b,a	Lbotch
1.1       cgd 3:
1.2        pk 	ld	[%g1+4], %o3	! fetch pc
1.1       cgd 	jmp	%o3 + 8		! success, return %g6
1.1       cgd 	 mov	%g6, %o0