1/* $NetBSD: _setjmp.S,v 1.9 2013/07/16 22:12:20 matt 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. 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 36#include <machine/asm.h> 37 38#if defined(LIBC_SCCS) && !defined(lint) 39#if 0 40 RCSID("from: @(#)_setjmp.s 5.1 (Berkeley) 5/12/90") 41#else 42 RCSID("$NetBSD: _setjmp.S,v 1.9 2013/07/16 22:12:20 matt Exp $") 43#endif 44#endif /* LIBC_SCCS and not lint */ 45 46/* 47 * C library -- _setjmp, _longjmp 48 * 49 * _longjmp(a,v) 50 * will generate a "return(v)" from 51 * the last call to 52 * _setjmp(a) 53 * by restoring registers from the stack, 54 * The previous signal state is NOT restored. 55 */ 56 57ENTRY(_setjmp) 58 movl 4(%sp),%a0 /* save area pointer */ 59 clrl (%a0)+ /* no old onstack */ 60 clrl (%a0)+ /* no old sigmask */ 61 movl %sp,(%a0)+ /* save old SP */ 62 movl %a6,(%a0)+ /* save old FP */ 63 clrl (%a0)+ /* no old AP */ 64 movl (%sp),(%a0)+ /* save old PC */ 65 clrl (%a0)+ /* clear PS */ 66 moveml #0x3CFC,(%a0) /* save other non-scratch regs */ 67 clrl %d0 /* return zero */ 68 rts 69END(_setjmp) 70 71ENTRY(_longjmp) 72 movl 4(%sp),%a0 /* save area pointer */ 73 addql #8,%a0 /* skip onstack/sigmask */ 74 tstl (%a0) /* ensure non-zero SP */ 75 jeq botch /* oops! */ 76 movl 8(%sp),%d0 /* grab return value */ 77 jne ok /* non-zero ok */ 78 moveq #1,%d0 /* else make non-zero */ 79ok: 80 movl (%a0)+,%sp /* restore SP */ 81 movl (%a0)+,%a6 /* restore FP */ 82 addql #4,%a0 /* skip AP */ 83 movl (%a0)+,(%sp) /* restore PC */ 84 moveml 4(%a0),#0x3CFC /* restore non-scratch regs */ 85 rts 86 87botch: 88 jbsr PIC_PLT(_C_LABEL(longjmperror)) 89 stop #0 90END(_longjmp) 91