1/* $NetBSD: _setjmp.S,v 1.6 1999/10/25 23:48:09 thorpej Exp $ */ 2 3/*- 4 * Copyright (c) 1990 The Regents of the University of California. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * the Systems Programming Group of the University of Utah Computer 9 * Science Department. 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. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the University of 22 * California, Berkeley and its contributors. 23 * 4. Neither the name of the University nor the names of its contributors 24 * may be used to endorse or promote products derived from this software 25 * without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 * SUCH DAMAGE. 38 */ 39 40#include <machine/asm.h> 41 42#if defined(LIBC_SCCS) && !defined(lint) 43#if 0 44 RCSID("from: @(#)_setjmp.s 5.1 (Berkeley) 5/12/90") 45#else 46 RCSID("$NetBSD: _setjmp.S,v 1.6 1999/10/25 23:48:09 thorpej Exp $") 47#endif 48#endif /* LIBC_SCCS and not lint */ 49 50/* 51 * C library -- _setjmp, _longjmp 52 * 53 * _longjmp(a,v) 54 * will generate a "return(v)" from 55 * the last call to 56 * _setjmp(a) 57 * by restoring registers from the stack, 58 * The previous signal state is NOT restored. 59 */ 60 61ENTRY(_setjmp) 62 movl %sp@(4),%a0 /* save area pointer */ 63 clrl %a0@+ /* no old onstack */ 64 clrl %a0@+ /* no old sigmask */ 65 movl %sp,%a0@+ /* save old SP */ 66 movl %a6,%a0@+ /* save old FP */ 67 clrl %a0@+ /* no old AP */ 68 movl %sp@,%a0@+ /* save old PC */ 69 clrl %a0@+ /* clear PS */ 70 moveml #0x3CFC,%a0@ /* save other non-scratch regs */ 71 clrl %d0 /* return zero */ 72 rts 73 74ENTRY(_longjmp) 75 movl %sp@(4),%a0 /* save area pointer */ 76 addql #8,%a0 /* skip onstack/sigmask */ 77 tstl %a0@ /* ensure non-zero SP */ 78 jeq botch /* oops! */ 79 movl %sp@(8),%d0 /* grab return value */ 80 jne ok /* non-zero ok */ 81 moveq #1,%d0 /* else make non-zero */ 82ok: 83 movl %a0@+,%sp /* restore SP */ 84 movl %a0@+,%a6 /* restore FP */ 85 addql #4,%a0 /* skip AP */ 86 movl %a0@+,%sp@ /* restore PC */ 87 moveml %a0@(4),#0x3CFC /* restore non-scratch regs */ 88 rts 89 90botch: 91 jbsr PIC_PLT(_C_LABEL(longjmperror)) 92 stop #0 93