1 /* $OpenBSD: _setjmp.S,v 1.4 2007年11月25日 18:25:36 deraadt Exp $ */ 2 /* $NetBSD: _setjmp.S,v 1.1.1.1 1998年06月20日 05:18:14 eeh Exp $ */ 3 4 /* 5 * Copyright (c) 1992, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This software was developed by the Computer Systems Engineering group 9 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 10 * contributed to Berkeley. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * Header: _setjmp.s,v 1.1 91/07/06 16:45:53 torek Exp 37 */ 38 39 /* 40 * C library -- _setjmp, _longjmp 41 * 42 * _longjmp(a,v) 43 * will generate a "return(v?v:1)" from 44 * the last call to 45 * _setjmp(a) 46 * by unwinding the call stack. 47 * The previous signal state is NOT restored. 48 */ 49 50#include "DEFS.h" 51 52 ENTRY(_setjmp) 53 btst 1, %sp 54 bne,a,pt %xcc, 1f ! 32 or 64-bit stack? 55 std %sp, [%o0+0] ! 32-bit stack pointer & return pc 56 57 stx %sp, [%o0+0] ! 64-bit stack pointer 58 stx %o7, [%o0+8] ! 64-bit return pc 59 stx %fp, [%o0+16] ! 64-bit frame pointer 60 retl 61 clr %o0 62 1: 63 st %fp, [%o0+8] ! 32-bit frame pointer 64 retl 65 clr %o0 66 67 ENTRY(_longjmp) 68 set 1, %g6 69 btst 1, %fp ! 32 or 64-bit stack? 70 movrz %o1, %o1, %g6 ! compute v ? v : 1 in a global register 71 bne,pt %xcc, 2f ! 64-bit 72 mov %o0, %g1 ! save a in another global register 73 ld [%g1+8], %g7 /* get caller's frame */ 74 75 1: 76 cmp %fp, %g7 ! compare against desired frame 77 bl,a 1b ! if below, 78 restore ! pop frame and loop 79 bne,pn %icc, Llongjmpbotch ! if there, 80 ldd [%g1+0], %o2 ! fetch return %sp and pc, and get out 81 ba,a,pt %icc, 4f 82 2: 83 ldx [%g1+16], %g7 /* get caller's frame */ 84 85 3: 86 cmp %fp, %g7 ! compare against desired frame 87 bl,a,pt %xcc, 3b ! if below, 88 restore ! pop frame and loop 89 bne,pn %xcc, Llongjmpbotch ! if there, 90 ldx [%g1+0], %o2 ! fetch return %sp and pc, and get out 91 ldx [%g1+8], %o3 92 4: 93 cmp %o2, %sp ! %sp must not decrease 94 blt,pn %icc, Llongjmpbotch 95 movge %icc, %o2, %sp ! it is OK, put it in place 96 jmp %o3 + 8 ! success, return %g6 97 mov %g6, %o0 98 99 Lbotch: 100 call _longjmperror ! otherwise, went too far; bomb out 101 nop 102 unimp 0 103 ! otherwise, went too far; bomb out 104 105 106 107 108