_setjmp.S revision 1.4
1 /* $NetBSD: _setjmp.S,v 1.4 1997/07/16 14:37:39 christos 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 1997/07/16 14:37:39 christos 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 62 ENTRY(_setjmp) 63 st %sp, [%o0+0] /* store caller's stack pointer */ 64 st %o7, [%o0+4] /* ... return pc */ 65 st %fp, [%o0+8] /* ... and frame pointer */ 66 retl 67 clr %o0 ! return 0 68 69 ENTRY(_longjmp) 70 addcc %o1, %g0, %g6 ! compute v ? v : 1 in a global register 71 be,a 0f 72 mov 1, %g6 73 0: 74 mov %o0, %g1 ! save a in another global register 75 ld [%g1+8], %g7 /* get caller's frame */ 76 1: 77 cmp %fp, %g7 ! compare against desired frame 78 bl,a 1b ! if below, 79 restore ! pop frame and loop 80 be,a 2f ! if there, 81 ld [%g1+0], %o2 ! fetch return %sp 82 83 Lbotch: 84 call _longjmperror ! otherwise, went too far; bomb out 85 nop 86 unimp 0 87 88 2: 89 cmp %o2, %sp ! %sp must not decrease 90 bge,a 3f 91 mov %o2, %sp ! it is OK, put it in place 92 b,a Lbotch 93 3: 94 ld [%g1+4], %o3 ! fetch pc 95 jmp %o3 + 8 ! success, return %g6 96 mov %g6, %o0 97
Indexes created Thu Oct 23 18:09:57 GMT 2025