1/* $NetBSD: _setjmp.S,v 1.4 1998/10/08 02:27:59 eeh 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. 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 * from: Header: _setjmp.s,v 1.1 91/07/06 16:45:53 torek Exp 40 */ 41 42#include <machine/asm.h> 43#if defined(LIBC_SCCS) && !defined(lint) 44#if 0 45 .asciz "@(#)_setjmp.s 8.1 (Berkeley) 6/4/93" 46#else 47 RCSID("$NetBSD: _setjmp.S,v 1.4 1998/10/08 02:27:59 eeh Exp $") 48#endif 49#endif /* LIBC_SCCS and not lint */ 50 51/* 52 * C library -- _setjmp, _longjmp 53 * 54 * _longjmp(a,v) 55 * will generate a "return(v?v:1)" from 56 * the last call to 57 * _setjmp(a) 58 * by unwinding the call stack. 59 * The previous signal state is NOT restored. 60 */ 61 62ENTRY(_setjmp) 63 stx %sp, [%o0+0x00] /* store caller's stack pointer */ 64 stx %o7, [%o0+0x08] /* ... return pc */ 65 stx %fp, [%o0+0x10] /* ... and frame pointer */ 66 retl 67 clr %o0 ! return 0 68 69ENTRY(_longjmp) 70 mov 1, %g6 71 movrnz %o1, %o1, %g6 ! compute v ? v : 1 in a global register 72 mov %o0, %g1 ! save a in another global register 73 ldx [%g1+0x10], %g7 /* get caller's frame */ 741: 75 cmp %fp, %g7 ! compare against desired frame 76 bl,a 1b ! if below, 77 restore ! pop frame and loop 78 be,a 2f ! if there, 79 ldx [%g1+0], %o2 ! fetch return %sp 80 81Lbotch: 82 call _C_LABEL(longjmperror) ! otherwise, went too far; bomb out 83 nop 84 unimp 0 85 862: 87 cmp %o2, %sp ! %sp must not decrease 88 bge,a 3f 89 mov %o2, %sp ! it is OK, put it in place 90 b,a Lbotch 913: 92 ldx [%g1+0x8], %o3 ! fetch pc 93 jmp %o3 + 8 ! success, return %g6 94 mov %g6, %o0 95 96