1 /* $NetBSD: longjmp.c,v 1.2 2008/04/28 20:22:57 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 #include <stdio.h> 39 40 #define __LIBC12_SOURCE__ 41 #include <setjmp.h> 42 #include <compat/include/setjmp.h> 43 44 typedef struct { 45 __greg_t __glob[5]; 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 /* 60 * Set _UC_CPU. No FPU data saved, so we can't restore 61 * that. Set _UC_{SET,CLR}STACK according to SS_ONSTACK 62 */ 63 memset(&uc, 0, sizeof(uc)); 64 uc.uc_flags = _UC_CPU | (sc->sc_onstack ? _UC_SETSTACK : _UC_CLRSTACK); 65 66 /* 67 * Set the signal mask - this is a weak symbol, so don't use 68 * _UC_SIGMASK in the mcontext, libpthread might override sigprocmask. 69 */ 70 sigprocmask(SIG_SETMASK, &sc->sc_mask, NULL); 71 72 /* Fill other registers */ 73 uc.uc_mcontext.__gregs[_REG_CCR] = sc->sc_tstate; 74 uc.uc_mcontext.__gregs[_REG_PC] = sc->sc_pc; 75 uc.uc_mcontext.__gregs[_REG_nPC] = sc->sc_npc; 76 uc.uc_mcontext.__gregs[_REG_G1] = sc->sc_g1; 77 uc.uc_mcontext.__gregs[_REG_G2] = sc->sc_o0; 78 uc.uc_mcontext.__gregs[_REG_G3] = r->__glob[0]; 79 uc.uc_mcontext.__gregs[_REG_G4] = r->__glob[1]; 80 uc.uc_mcontext.__gregs[_REG_G5] = r->__glob[2]; 81 uc.uc_mcontext.__gregs[_REG_G6] = r->__glob[3]; 82 uc.uc_mcontext.__gregs[_REG_G7] = r->__glob[4]; 83 uc.uc_mcontext.__gregs[_REG_O6] = sc->sc_sp; 84 85 /* Make return value non-zero */ 86 if (val == 0) 87 val = 1; 88 89 /* Save return value in context */ 90 uc.uc_mcontext.__gregs[_REG_O0] = val; 91 92 setcontext(&uc); 93 94 err: 95 longjmperror(); 96 abort(); 97 /* NOTREACHED */ 98 } 99