1/* $NetBSD: compat_setjmp.S,v 1.1 2006/03/09 16:20:55 christos 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. 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#if defined(LIBC_SCCS) && !defined(lint) 39#if 0 40 RCSID("from: @(#)setjmp.s 5.1 (Berkeley) 5/12/90") 41#else 42 RCSID("$NetBSD: compat_setjmp.S,v 1.1 2006/03/09 16:20:55 christos Exp $") 43#endif 44#endif /* LIBC_SCCS and not lint */ 45 46/* 47 * C library -- setjmp, longjmp 48 * 49 * longjmp(a,v) 50 * will generate a "return(v)" from 51 * the last call to 52 * setjmp(a) 53 * by restoring registers from the stack, 54 * and a struct sigcontext, see <signal.h> 55 */ 56 57ENTRY(setjmp) 58 lea %sp@(-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 PIC_PLT(_C_LABEL(__sigaltstack14)) 62 /* note: flags returned in sp@(8) */ 63 clrl %sp@ /* don't change mask, just return */ 64 jbsr PIC_PLT(_C_LABEL(sigblock)) /* old value */ 65 movl %sp@(8),%d1 /* old flags value */ 66 andl #1,%d1 /* extract onstack flag */ 67 lea %sp@(12),%sp 68 movl %sp@(4),%a0 /* save area pointer */ 69 movl %d1,%a0@+ /* save old onstack value */ 70 movl %d0,%a0@+ /* save old signal mask */ 71 lea %sp@(4),%a1 /* adjust saved SP since we won't rts */ 72 movl %a1,%a0@+ /* save old SP */ 73 movl %a6,%a0@+ /* save old FP */ 74 clrl %a0@+ /* no AP */ 75 movl %sp@,%a0@+ /* save old PC */ 76 clrl %a0@+ /* clean PS */ 77 moveml #0x3CFC,%a0@ /* save remaining non-scratch regs */ 78 clrl %d0 /* return 0 */ 79 rts 80 81ENTRY(longjmp) 82 movl %sp@(4),%a0 /* save area pointer */ 83 tstl %a0@(8) /* ensure non-zero SP */ 84 jeq botch /* oops! */ 85 movl %sp@(8),%d0 /* grab return value */ 86 jne ok /* non-zero ok */ 87 moveq #1,%d0 /* else make non-zero */ 88ok: 89 moveml %a0@(28),#0x3CFC /* restore non-scratch regs */ 90 movl %a0,%sp@- /* let sigreturn */ 91 jbsr PIC_PLT(_C_LABEL(sigreturn)) /* finish for us */ 92 93botch: 94 jbsr PIC_PLT(_C_LABEL(longjmperror)) 95 stop #0 96