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_setjmp.S revision 1.9 
      1 /*	$NetBSD: _setjmp.S,v 1.9 2011/04/30 23:41:12 martin Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1999 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Paul Kranenburg.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <machine/asm.h>
     33 #include <machine/trap.h>
     34 
     35 #if defined(LIBC_SCCS) && !defined(lint)
     36 RCSID("$NetBSD: _setjmp.S,v 1.9 2011/04/30 23:41:12 martin Exp $")
     37 #endif /* LIBC_SCCS and not lint */
     38 
     39 /*
     40  * C library -- _setjmp, _longjmp
     41  *
     42  *	_longjmp(a,v)
     43  * will generate a "return(v?v:1)" from
     44  * the last call to
     45  *	_setjmp(a)
     46  * The previous signal state is NOT restored.
     47  */
     48 
     49 ENTRY(_setjmp)
     50 	/* store important globals, sigsetjmp compatible */
     51 	st	%g3, [%o0 + 16]
     52 	st	%g2, [%o0 + 24]
     53 	st	%g4, [%o0 + 48]
     54 	st	%g7, [%o0 + 52]
     55 
     56 	st	%sp, [%o0+0]	/* store caller's stack pointer */
     57 	st	%o7, [%o0+4]	/* and the return pc */
     58 	retl
     59 	 clr	%o0		! return 0
     60 
     61 ENTRY(_longjmp)
     62 	sub	%sp, 64, %sp	! set up a local stack frame
     63 	tst	%o1		! compute v ? v : 1
     64 	be,a	0f
     65 	 mov	1, %o1
     66 0:
     67 	t	ST_FLUSHWIN	! flush register windows out to the stack
     68 
     69 	/* restore globals */
     70 	ld	[%o0 + 16], %g3
     71 	ld	[%o0 + 24], %g2
     72 	ld	[%o0 + 48], %g4
     73 	ld	[%o0 + 52], %g7
     74 
     75 	/*
     76 	 * We restore the saved stack pointer to %fp, then issue
     77 	 * a `restore' instruction which will reload the register
     78 	 * window from the stack.
     79 	 */
     80 	ld	[%o0+4], %o7	/* restore return pc */
     81 	ld	[%o0+0], %fp	/* and stack pointer */
     82 
     83 	retl			! success, return %o1
     84 	 restore	%o1, 0, %o0
     85