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 39 #define __LIBC12_SOURCE__ 40 #include <setjmp.h> 41 #include <compat/include/setjmp.h> 42 43 /* 44 * Use setcontext to reload the stack pointer, program counter <pc,npc>, and 45 * set the return value in %o0. The %i and %l registers will be reloaded 46 * from the place to which %sp points. 47 */ 48 void 49 __longjmp14(jmp_buf env, int val) 50 { 51 struct sigcontext *sc = (void *)env; 52 ucontext_t uc; 53 54 /* Ensure non-zero SP */ 55 if (sc->sc_sp == 0) 56 goto err; 57 58 /* Initialise the fields we're going to use */ 59 uc.uc_link = 0; 60 61 /* 62 * Set _UC_{SET,CLR}STACK according to SS_ONSTACK. 63 * 64 * Restore the signal mask with sigprocmask() instead of _UC_SIGMASK, 65 * since libpthread may want to interpose on signal handling. 66 */ 67 uc.uc_flags = _UC_CPU | (sc->sc_onstack ? _UC_SETSTACK : _UC_CLRSTACK); 68 69 sigprocmask(SIG_SETMASK, &sc->sc_mask, NULL); 70 71 /* Extract PSR, PC, NPC and SP from jmp_buf */ 72 uc.uc_mcontext.__gregs[_REG_PSR] = sc->sc_psr; 73 uc.uc_mcontext.__gregs[_REG_PC] = sc->sc_pc; 74 uc.uc_mcontext.__gregs[_REG_nPC] = sc->sc_npc; 75 uc.uc_mcontext.__gregs[_REG_O6] = sc->sc_sp; 76 77 /* Set the return value; make sure it's non-zero */ 78 uc.uc_mcontext.__gregs[_REG_O0] = (val != 0 ? val : 1); 79 80 setcontext(&uc); 81 82 err: 83 longjmperror(); 84 abort(); 85 /* NOTREACHED */ 86 } 87