1 /* $NetBSD: longjmp.c,v 1.1 2005/10/16 17:15:38 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 #include <stdio.h> 46 47 #define __LIBC12_SOURCE__ 48 #include <setjmp.h> 49 #include <compat/include/setjmp.h> 50 51 typedef struct { 52 __greg_t __glob[5]; 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 /* 67 * Set _UC_CPU. No FPU data saved, so we can't restore 68 * that. Set _UC_{SET,CLR}STACK according to SS_ONSTACK 69 */ 70 memset(&uc, 0, sizeof(uc)); 71 uc.uc_flags = _UC_CPU | (sc->sc_onstack ? _UC_SETSTACK : _UC_CLRSTACK); 72 73 /* 74 * Set the signal mask - this is a weak symbol, so don't use 75 * _UC_SIGMASK in the mcontext, libpthread might override sigprocmask. 76 */ 77 sigprocmask(SIG_SETMASK, &sc->sc_mask, NULL); 78 79 /* Fill other registers */ 80 uc.uc_mcontext.__gregs[_REG_CCR] = sc->sc_tstate; 81 uc.uc_mcontext.__gregs[_REG_PC] = sc->sc_pc; 82 uc.uc_mcontext.__gregs[_REG_nPC] = sc->sc_npc; 83 uc.uc_mcontext.__gregs[_REG_G1] = sc->sc_g1; 84 uc.uc_mcontext.__gregs[_REG_G2] = sc->sc_o0; 85 uc.uc_mcontext.__gregs[_REG_G3] = r->__glob[0]; 86 uc.uc_mcontext.__gregs[_REG_G4] = r->__glob[1]; 87 uc.uc_mcontext.__gregs[_REG_G5] = r->__glob[2]; 88 uc.uc_mcontext.__gregs[_REG_G6] = r->__glob[3]; 89 uc.uc_mcontext.__gregs[_REG_G7] = r->__glob[4]; 90 uc.uc_mcontext.__gregs[_REG_O6] = sc->sc_sp; 91 92 /* Make return value non-zero */ 93 if (val == 0) 94 val = 1; 95 96 /* Save return value in context */ 97 uc.uc_mcontext.__gregs[_REG_O0] = val; 98 99 setcontext(&uc); 100 101 err: 102 longjmperror(); 103 abort(); 104 /* NOTREACHED */ 105 } 106