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. 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/* 39 * C library -- _setjmp, _longjmp 40 * 41 * _longjmp(a,v) 42 * will generate a "return(v?v:1)" from 43 * the last call to 44 * _setjmp(a) 45 * by unwinding the call stack. 46 * The previous signal state is NOT restored. 47 */ 48 49ENTRY(_setjmp) 50 stx %sp, [%o0+0x00] /* store caller's stack pointer */ 51 stx %o7, [%o0+0x08] /* ... return pc */ 52 stx %fp, [%o0+0x10] /* ... and frame pointer */ 53 retl 54 clr %o0 ! return 0 55 56ENTRY(_longjmp) 57 mov 1, %g6 58 movrnz %o1, %o1, %g6 ! compute v ? v : 1 in a global register 59 mov %o0, %g1 ! save a in another global register 60 ldx [%g1+0x10], %g7 /* get caller's frame */ 611: 62 cmp %fp, %g7 ! compare against desired frame 63 bl,a 1b ! if below, 64 restore ! pop frame and loop 65 be,a 2f ! if there, 66 ldx [%g1+0], %o2 ! fetch return %sp 67 68Lbotch: 69 call _C_LABEL(longjmperror) ! otherwise, went too far; bomb out 70 nop 71 unimp 0 72 732: 74 cmp %o2, %sp ! %sp must not decrease 75 bge,a 3f 76 mov %o2, %sp ! it is OK, put it in place 77 b,a Lbotch 783: 79 ldx [%g1+0x8], %o3 ! fetch pc 80 jmp %o3 + 8 ! success, return %g6 81 mov %g6, %o0 82 83