1/* $NetBSD: setjmp.S,v 1.10 1999/10/25 23:48:12 thorpej Exp $ */ 2 3/*- 4 * Copyright (c) 1990 The Regents of the University of California. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * the Systems Programming Group of the University of Utah Computer 9 * Science Department. 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 40#include <machine/asm.h> 41 42#if defined(LIBC_SCCS) && !defined(lint) 43#if 0 44 RCSID("from: @(#)setjmp.s 5.1 (Berkeley) 5/12/90") 45#else 46 RCSID("$NetBSD: setjmp.S,v 1.10 1999/10/25 23:48:12 thorpej Exp $") 47#endif 48#endif /* LIBC_SCCS and not lint */ 49 50/* 51 * C library -- setjmp, longjmp 52 * 53 * longjmp(a,v) 54 * will generate a "return(v)" from 55 * the last call to 56 * setjmp(a) 57 * by restoring registers from the stack, 58 * and a struct sigcontext, see <signal.h> 59 */ 60 61ENTRY(setjmp) 62 lea %sp@(-12),%sp /* space for sigstack args/rvals */ 63 clrl %sp@ /* don't change it... */ 64 movl %sp,%sp@(4) /* ...but return the current val */ 65 jbsr PIC_PLT(_C_LABEL(__sigaltstack14)) 66 /* note: flags returned in sp@(8) */ 67 clrl %sp@ /* don't change mask, just return */ 68 jbsr PIC_PLT(_C_LABEL(sigblock)) /* old value */ 69 movl %sp@(8),%d1 /* old flags value */ 70 andl #1,%d1 /* extract onstack flag */ 71 lea %sp@(12),%sp 72 movl %sp@(4),%a0 /* save area pointer */ 73 movl %d1,%a0@+ /* save old onstack value */ 74 movl %d0,%a0@+ /* save old signal mask */ 75 lea %sp@(4),%a1 /* adjust saved SP since we won't rts */ 76 movl %a1,%a0@+ /* save old SP */ 77 movl %a6,%a0@+ /* save old FP */ 78 clrl %a0@+ /* no AP */ 79 movl %sp@,%a0@+ /* save old PC */ 80 clrl %a0@+ /* clean PS */ 81 moveml #0x3CFC,%a0@ /* save remaining non-scratch regs */ 82 clrl %d0 /* return 0 */ 83 rts 84 85ENTRY(longjmp) 86 movl %sp@(4),%a0 /* save area pointer */ 87 tstl %a0@(8) /* ensure non-zero SP */ 88 jeq botch /* oops! */ 89 movl %sp@(8),%d0 /* grab return value */ 90 jne ok /* non-zero ok */ 91 moveq #1,%d0 /* else make non-zero */ 92ok: 93 moveml %a0@(28),#0x3CFC /* restore non-scratch regs */ 94 movl %a0,%sp@- /* let sigreturn */ 95 jbsr PIC_PLT(_C_LABEL(sigreturn)) /* finish for us */ 96 97botch: 98 jbsr PIC_PLT(_C_LABEL(longjmperror)) 99 stop #0 100