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_setjmp.S revision 1.1 
      1 /*
      2  * Copyright (c) 1992, 1993
      3  *	The Regents of the University of California.  All rights reserved.
      4  *
      5  * This software was developed by the Computer Systems Engineering group
      6  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
      7  * contributed to Berkeley.
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  * 3. All advertising materials mentioning features or use of this software
     18  *    must display the following acknowledgement:
     19  *	This product includes software developed by the University of
     20  *	California, Berkeley and its contributors.
     21  * 4. Neither the name of the University nor the names of its contributors
     22  *    may be used to endorse or promote products derived from this software
     23  *    without specific prior written permission.
     24  *
     25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     35  * SUCH DAMAGE.
     36  *
     37  * from: Header: _setjmp.s,v 1.1 91/07/06 16:45:53 torek Exp
     38  * $Id: _setjmp.S,v 1.1 1993/10/07 00:21:26 cgd Exp $
     39  */
     40 
     41 #if defined(LIBC_SCCS) && !defined(lint)
     42 	.asciz "@(#)_setjmp.s	8.1 (Berkeley) 6/4/93"
     43 #endif /* LIBC_SCCS and not lint */
     44 
     45 /*
     46  * C library -- _setjmp, _longjmp
     47  *
     48  *	_longjmp(a,v)
     49  * will generate a "return(v?v:1)" from
     50  * the last call to
     51  *	_setjmp(a)
     52  * by unwinding the call stack.
     53  * The previous signal state is NOT restored.
     54  */
     55 
     56 #include "DEFS.h"
     57 
     58 ENTRY(_setjmp)
     59 	std	%sp, [%o0+0]	/* caller's stack pointer and return pc */
     60 	st	%fp, [%o0+8]	/* store caller's frame pointer */
     61 	retl
     62 	 clr	%o0		! return 0
     63 
     64 ENTRY(_longjmp)
     65 	addcc	%o1, %g0, %g6	! compute v ? v : 1 in a global register
     66 	be,a	0f
     67 	 mov	1, %g6
     68 0:
     69 	mov	%o0, %g1	! save a in another global register
     70 	ld	[%g1+8], %g7	/* get caller's frame */
     71 1:
     72 	cmp	%fp, %g7	! compare against desired frame
     73 	bl,a	1b		! if below,
     74 	 restore		!    pop frame and loop
     75 	be,a	2f		! if there,
     76 	 ldd	[%g1+0], %o2	!    fetch return %sp and pc, and get out
     77 
     78 Lbotch:
     79 	call	_longjmperror	! otherwise, went too far; bomb out
     80 	nop
     81 	unimp	0
     82 
     83 2:
     84 	cmp	%o2, %sp	! %sp must not decrease
     85 	bge,a	3f
     86 	 mov	%o2, %sp	! it is OK, put it in place
     87 	b,a	Lbotch
     88 3:
     89 	jmp	%o3 + 8		! success, return %g6
     90 	 mov	%g6, %o0
     91