1 /* $NetBSD: longjmp.c,v 1.1 2005/10/15 22:11:22 uwe 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 /* 51 * Use setcontext to reload the stack pointer, program counter <pc,npc>, and 52 * set the return value in %o0. The %i and %l registers will be reloaded 53 * from the place to which %sp points. 54 */ 55 void 56 __longjmp14(jmp_buf env, int val) 57 { 58 struct sigcontext *sc = (void *)env; 59 ucontext_t uc; 60 61 /* Ensure non-zero SP */ 62 if (sc->sc_sp == 0) 63 goto err; 64 65 /* Initialise the fields we're going to use */ 66 uc.uc_link = 0; 67 68 /* 69 * Set _UC_{SET,CLR}STACK according to SS_ONSTACK. 70 * 71 * Restore the signal mask with sigprocmask() instead of _UC_SIGMASK, 72 * since libpthread may want to interpose on signal handling. 73 */ 74 uc.uc_flags = _UC_CPU | (sc->sc_onstack ? _UC_SETSTACK : _UC_CLRSTACK); 75 76 sigprocmask(SIG_SETMASK, &sc->sc_mask, NULL); 77 78 /* Extract PSR, PC, NPC and SP from jmp_buf */ 79 uc.uc_mcontext.__gregs[_REG_PSR] = sc->sc_psr; 80 uc.uc_mcontext.__gregs[_REG_PC] = sc->sc_pc; 81 uc.uc_mcontext.__gregs[_REG_nPC] = sc->sc_npc; 82 uc.uc_mcontext.__gregs[_REG_O6] = sc->sc_sp; 83 84 /* Set the return value; make sure it's non-zero */ 85 uc.uc_mcontext.__gregs[_REG_O0] = (val != 0 ? val : 1); 86 87 setcontext(&uc); 88 89 err: 90 longjmperror(); 91 abort(); 92 /* NOTREACHED */ 93 } 94