93 lines
3.2 KiB
ArmAsm
93 lines
3.2 KiB
ArmAsm
/*
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This software was developed by the Computer Systems Engineering group
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* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
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* contributed to Berkeley.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: Header: _setjmp.s,v 1.1 91/07/06 16:45:53 torek Exp
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* $Id: _setjmp.S,v 1.3 1996/11/18 22:50:29 pk Exp $
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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.asciz "@(#)_setjmp.s 8.1 (Berkeley) 6/4/93"
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#endif /* LIBC_SCCS and not lint */
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/*
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* C library -- _setjmp, _longjmp
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*
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* _longjmp(a,v)
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* will generate a "return(v?v:1)" from
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* the last call to
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* _setjmp(a)
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* by unwinding the call stack.
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* The previous signal state is NOT restored.
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*/
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#include <machine/asm.h>
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ENTRY(_setjmp)
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st %sp, [%o0+0] /* store caller's stack pointer */
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st %o7, [%o0+4] /* ... return pc */
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st %fp, [%o0+8] /* ... and frame pointer */
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retl
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clr %o0 ! return 0
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ENTRY(_longjmp)
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addcc %o1, %g0, %g6 ! compute v ? v : 1 in a global register
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be,a 0f
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mov 1, %g6
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0:
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mov %o0, %g1 ! save a in another global register
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ld [%g1+8], %g7 /* get caller's frame */
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1:
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cmp %fp, %g7 ! compare against desired frame
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bl,a 1b ! if below,
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restore ! pop frame and loop
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be,a 2f ! if there,
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ld [%g1+0], %o2 ! fetch return %sp
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Lbotch:
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call _longjmperror ! otherwise, went too far; bomb out
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nop
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unimp 0
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2:
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cmp %o2, %sp ! %sp must not decrease
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bge,a 3f
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mov %o2, %sp ! it is OK, put it in place
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b,a Lbotch
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3:
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ld [%g1+4], %o3 ! fetch pc
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jmp %o3 + 8 ! success, return %g6
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mov %g6, %o0
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