1 /* $NetBSD: longjmp.c,v 1.1 2006/03/09 16:20:27 christos 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 #include "namespace.h" 40 #include <sys/types.h> 41 #include <ucontext.h> 42 #include <signal.h> 43 #include <stdlib.h> 44 #include <string.h> 45 46 #define __LIBC12_SOURCE__ 47 #include <setjmp.h> 48 #include <compat/include/setjmp.h> 49 50 typedef struct { 51 __greg_t __data[6]; 52 __greg_t __addr[4]; 53 } __jmp_buf_regs_t; 54 55 void 56 __longjmp14(jmp_buf env, int val) 57 { 58 struct sigcontext *sc = (void *)env; 59 __jmp_buf_regs_t *r = (void *)&sc[1]; 60 ucontext_t uc; 61 62 /* Ensure non-zero SP */ 63 if (sc->sc_sp == 0) 64 goto err; 65 66 /* Make return value non-zero */ 67 if (val == 0) 68 val = 1; 69 70 /* Save return value in context */ 71 uc.uc_mcontext.__gregs[_REG_D0] = val; 72 73 /* 74 * Set _UC_SIGMASK, _UC_CPU and _UC_M68K_UC_USER 75 * Set _UC_{SET,CLR}STACK according to SS_ONSTACK 76 */ 77 uc.uc_flags = _UC_SIGMASK | _UC_CPU | _UC_M68K_UC_USER | 78 (sc->sc_onstack ? _UC_SETSTACK : _UC_CLRSTACK); 79 80 /* Clear uc_link */ 81 uc.uc_link = 0; 82 83 /* Copy signal mask */ 84 uc.uc_sigmask = sc->sc_mask; 85 86 /* Copy SP/PC/PS/FP */ 87 uc.uc_mcontext.__gregs[_REG_A7] = sc->sc_sp; 88 uc.uc_mcontext.__gregs[_REG_PC] = sc->sc_pc; 89 uc.uc_mcontext.__gregs[_REG_PS] = sc->sc_ps; 90 uc.uc_mcontext.__gregs[_REG_A6] = sc->sc_fp; 91 92 /* Copy remaining non-scratch regs. */ 93 memcpy(&uc.uc_mcontext.__gregs[_REG_D2], 94 &r->__data, sizeof(r->__data)); 95 memcpy(&uc.uc_mcontext.__gregs[_REG_A2], 96 &r->__addr, sizeof(r->__addr)); 97 98 setcontext(&uc); 99 err: 100 longjmperror(); 101 abort(); 102 /* NOTREACHED */ 103 } 104