1/*- 2 * Copyright (c) 1990 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * the Systems Programming Group of the University of Utah Computer 7 * Science Department. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by the University of 20 * California, Berkeley and its contributors. 21 * 4. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 */ 37 38#if defined(LIBC_SCCS) && !defined(lint) 39 .text 40 /*.asciz "from: @(#)setjmp.s 5.1 (Berkeley) 5/12/90"*/ 41 .asciz "$Id: setjmp.S,v 1.4 1994/08/05 22:35:20 mycroft Exp $" 42#endif /* LIBC_SCCS and not lint */ 43 44/* 45 * C library -- setjmp, longjmp 46 * 47 * longjmp(a,v) 48 * will generate a "return(v)" from 49 * the last call to 50 * setjmp(a) 51 * by restoring registers from the stack, 52 * and a struct sigcontext, see <signal.h> 53 */ 54 55#include "DEFS.h" 56 57ENTRY(setjmp) 58 subl #12,sp /* space for sigstack args/rvals */ 59 clrl sp@ /* don't change it... */ 60 movl sp,sp@(4) /* ...but return the current val */ 61 jbsr _sigaltstack /* note: flags returned in sp@(8) */ 62 clrl sp@ /* don't change mask, just return */ 63 jbsr _sigblock /* old value */ 64 movl sp@(8),d1 /* old flags value */ 65 andl #1,d1 /* extract onstack flag */ 66 addl #12,sp 67 movl sp@(4),a0 /* save area pointer */ 68 movl d1,a0@+ /* save old onstack value */ 69 movl d0,a0@+ /* save old signal mask */ 70 lea sp@(4),a1 /* adjust saved SP since we won't rts */ 71 movl a1,a0@+ /* save old SP */ 72 movl a6,a0@+ /* save old FP */ 73 clrl a0@+ /* no AP */ 74 movl sp@,a0@+ /* save old PC */ 75 clrl a0@+ /* clean PS */ 76 moveml #0x3CFC,a0@ /* save remaining non-scratch regs */ 77 clrl d0 /* return 0 */ 78 rts 79 80ENTRY(longjmp) 81 movl sp@(4),a0 /* save area pointer */ 82 tstl a0@(8) /* ensure non-zero SP */ 83 jeq botch /* oops! */ 84 movl sp@(8),d0 /* grab return value */ 85 jne ok /* non-zero ok */ 86 moveq #1,d0 /* else make non-zero */ 87ok: 88 moveml a0@(28),#0x3CFC /* restore non-scratch regs */ 89 movl a0,sp@- /* let sigreturn */ 90 jbsr _sigreturn /* finish for us */ 91 92botch: 93 jbsr _longjmperror 94 stop #0 95