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_setjmp.S revision 1.5 
      1 /*	$NetBSD: _setjmp.S,v 1.5 2003/08/07 16:42:27 agc Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1992, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * This software was developed by the Computer Systems Engineering group
      8  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
      9  * contributed to Berkeley.
     10  *
     11  * Redistribution and use in source and binary forms, with or without
     12  * modification, are permitted provided that the following conditions
     13  * are met:
     14  * 1. Redistributions of source code must retain the above copyright
     15  *    notice, this list of conditions and the following disclaimer.
     16  * 2. Redistributions in binary form must reproduce the above copyright
     17  *    notice, this list of conditions and the following disclaimer in the
     18  *    documentation and/or other materials provided with the distribution.
     19  * 3. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  *
     35  * from: Header: _setjmp.s,v 1.1 91/07/06 16:45:53 torek Exp
     36  */
     37 
     38 #include <machine/asm.h>
     39 #if defined(LIBC_SCCS) && !defined(lint)
     40 #if 0
     41 	.asciz "@(#)_setjmp.s	8.1 (Berkeley) 6/4/93"
     42 #else
     43 	RCSID("$NetBSD: _setjmp.S,v 1.5 2003/08/07 16:42:27 agc Exp $")
     44 #endif
     45 #endif /* LIBC_SCCS and not lint */
     46 
     47 /*
     48  * C library -- _setjmp, _longjmp
     49  *
     50  *	_longjmp(a,v)
     51  * will generate a "return(v?v:1)" from
     52  * the last call to
     53  *	_setjmp(a)
     54  * by unwinding the call stack.
     55  * The previous signal state is NOT restored.
     56  */
     57 
     58 ENTRY(_setjmp)
     59 	stx	%sp, [%o0+0x00]	/* store caller's stack pointer */
     60 	stx	%o7, [%o0+0x08]	/* ... return pc */
     61 	stx	%fp, [%o0+0x10]	/* ... and frame pointer */
     62 	retl
     63 	 clr	%o0		! return 0
     64 
     65 ENTRY(_longjmp)
     66 	mov	1, %g6
     67 	movrnz	%o1, %o1, %g6	! compute v ? v : 1 in a global register
     68 	mov	%o0, %g1	! save a in another global register
     69 	ldx	[%g1+0x10], %g7	/* get caller's frame */
     70 1:
     71 	cmp	%fp, %g7	! compare against desired frame
     72 	bl,a	1b		! if below,
     73 	 restore		!    pop frame and loop
     74 	be,a	2f		! if there,
     75 	 ldx	[%g1+0], %o2	!    fetch return %sp
     76 
     77 Lbotch:
     78 	call	_C_LABEL(longjmperror)	! otherwise, went too far; bomb out
     79 	nop
     80 	unimp	0
     81 
     82 2:
     83 	cmp	%o2, %sp	! %sp must not decrease
     84 	bge,a	3f
     85 	 mov	%o2, %sp	! it is OK, put it in place
     86 	b,a	Lbotch
     87 3:
     88 	ldx	[%g1+0x8], %o3	! fetch pc
     89 	jmp	%o3 + 8		! success, return %g6
     90 	 mov	%g6, %o0
     91 
     92