/* $OpenBSD: _setjmp.S,v 1.4 2007/11/25 18:25:36 deraadt Exp $ */ /* $NetBSD: _setjmp.S,v 1.1.1.1 1998/06/20 05:18:14 eeh Exp $ */ /* * Copyright (c) 1992, 1993 * The Regents of the University of California. All rights reserved. * * This software was developed by the Computer Systems Engineering group * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and * contributed to Berkeley. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * Header: _setjmp.s,v 1.1 91/07/06 16:45:53 torek Exp */ /* * C library -- _setjmp, _longjmp * * _longjmp(a,v) * will generate a "return(v?v:1)" from * the last call to * _setjmp(a) * by unwinding the call stack. * The previous signal state is NOT restored. */ #include "DEFS.h" ENTRY(_setjmp) btst 1, %sp bne,a,pt %xcc, 1f ! 32 or 64-bit stack? std %sp, [%o0+0] ! 32-bit stack pointer & return pc stx %sp, [%o0+0] ! 64-bit stack pointer stx %o7, [%o0+8] ! 64-bit return pc stx %fp, [%o0+16] ! 64-bit frame pointer retl clr %o0 1: st %fp, [%o0+8] ! 32-bit frame pointer retl clr %o0 ENTRY(_longjmp) set 1, %g6 btst 1, %fp ! 32 or 64-bit stack? movrz %o1, %o1, %g6 ! compute v ? v : 1 in a global register bne,pt %xcc, 2f ! 64-bit mov %o0, %g1 ! save a in another global register ld [%g1+8], %g7 /* get caller's frame */ 1: cmp %fp, %g7 ! compare against desired frame bl,a 1b ! if below, restore ! pop frame and loop bne,pn %icc, Llongjmpbotch ! if there, ldd [%g1+0], %o2 ! fetch return %sp and pc, and get out ba,a,pt %icc, 4f 2: ldx [%g1+16], %g7 /* get caller's frame */ 3: cmp %fp, %g7 ! compare against desired frame bl,a,pt %xcc, 3b ! if below, restore ! pop frame and loop bne,pn %xcc, Llongjmpbotch ! if there, ldx [%g1+0], %o2 ! fetch return %sp and pc, and get out ldx [%g1+8], %o3 4: cmp %o2, %sp ! %sp must not decrease blt,pn %icc, Llongjmpbotch movge %icc, %o2, %sp ! it is OK, put it in place jmp %o3 + 8 ! success, return %g6 mov %g6, %o0 Lbotch: call _longjmperror ! otherwise, went too far; bomb out nop unimp 0 ! otherwise, went too far; bomb out