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      1 /*	$NetBSD: longjmp.c,v 1.2 2008/04/28 20:22:56 martin Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2003 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Christian Limpach.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include "namespace.h"
     33 #include <sys/types.h>
     34 #include <ucontext.h>
     35 #include <signal.h>
     36 #include <stdlib.h>
     37 #include <string.h>
     38 
     39 #define __LIBC12_SOURCE__
     40 #include <setjmp.h>
     41 #include <compat/include/setjmp.h>
     42 
     43 typedef struct {
     44 	__greg_t	__data[6];
     45 	__greg_t	__addr[4];
     46 } __jmp_buf_regs_t;
     47 
     48 void
     49 __longjmp14(jmp_buf env, int val)
     50 {
     51 	struct sigcontext *sc = (void *)env;
     52 	__jmp_buf_regs_t *r = (void *)&sc[1];
     53 	ucontext_t uc;
     54 
     55 	/* Ensure non-zero SP */
     56 	if (sc->sc_sp == 0)
     57 		goto err;
     58 
     59 	/* Make return value non-zero */
     60 	if (val == 0)
     61 		val = 1;
     62 
     63 	/* Save return value in context */
     64 	uc.uc_mcontext.__gregs[_REG_D0] = val;
     65 
     66 	/*
     67 	 * Set _UC_SIGMASK, _UC_CPU and _UC_M68K_UC_USER
     68 	 * Set _UC_{SET,CLR}STACK according to SS_ONSTACK
     69 	 */
     70 	uc.uc_flags = _UC_SIGMASK | _UC_CPU | _UC_M68K_UC_USER |
     71 		(sc->sc_onstack ? _UC_SETSTACK : _UC_CLRSTACK);
     72 
     73 	/* Clear uc_link */
     74 	uc.uc_link = 0;
     75 
     76 	/* Copy signal mask */
     77 	uc.uc_sigmask = sc->sc_mask;
     78 
     79 	/* Copy SP/PC/PS/FP */
     80 	uc.uc_mcontext.__gregs[_REG_A7] = sc->sc_sp;
     81 	uc.uc_mcontext.__gregs[_REG_PC] = sc->sc_pc;
     82 	uc.uc_mcontext.__gregs[_REG_PS] = sc->sc_ps;
     83 	uc.uc_mcontext.__gregs[_REG_A6] = sc->sc_fp;
     84 
     85 	/* Copy remaining non-scratch regs. */
     86 	memcpy(&uc.uc_mcontext.__gregs[_REG_D2],
     87 	    &r->__data, sizeof(r->__data));
     88 	memcpy(&uc.uc_mcontext.__gregs[_REG_A2],
     89 	    &r->__addr, sizeof(r->__addr));
     90 
     91 	setcontext(&uc);
     92  err:
     93 	longjmperror();
     94 	abort();
     95 	/* NOTREACHED */
     96 }
     97