1/* $NetBSD: compat_setjmp.S,v 1.3 2014/03/04 06:27:00 matt 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 1.3 2014/03/04 06:27:00 matt 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 -12(%sp),%sp /* space for sigstack args/rvals */ 59 clrl (%sp) /* don't change it... */ 60 movl %sp,4(%sp) /* ...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 8(%sp),%d1 /* old flags value */ 66 andl #1,%d1 /* extract onstack flag */ 67 lea 12(%sp),%sp 68 movl 4(%sp),%a0 /* save area pointer */ 69 movl %d1,(%a0)+ /* save old onstack value */ 70 movl %d0,(%a0)+ /* save old signal mask */ 71 lea 4(%sp),%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 80END(setjmp) 81 82ENTRY(longjmp) 83 movl 4(%sp),%a0 /* save area pointer */ 84 tstl 8(%a0) /* ensure non-zero SP */ 85 jeq botch /* oops! */ 86 movl 8(%sp),%d0 /* grab return value */ 87 jne ok /* non-zero ok */ 88 moveq #1,%d0 /* else make non-zero */ 89ok: 90 moveml 28(%a0),#0x3CFC /* restore non-scratch regs */ 91 movl %a0,-(%sp) /* let sigreturn */ 92 trap #1 /* finish via compat_13_sigreturn13() */ 93 94botch: 95 jbsr PIC_PLT(_C_LABEL(longjmperror)) 96 stop #0 97END(longjmp) 98