longjmp.c revision 178580
1/* $NetBSD: longjmp.c,v 1.1 2005/09/17 11:49:39 tsutsui 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 and Matt Thomas. 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 <sys/cdefs.h> 40__FBSDID("$FreeBSD: head/lib/libc/mips/gen/longjmp.c 178580 2008-04-26 12:08:02Z imp $"); 41#include "namespace.h" 42#include <sys/types.h> 43#include <ucontext.h> 44#include <signal.h> 45#include <stdlib.h> 46#include <string.h> 47 48#include <machine/regnum.h> 49 50void 51__longjmp14(jmp_buf env, int val) 52{ 53 struct sigcontext *sc = (void *)env; 54 ucontext_t uc; 55 56 /* Ensure non-zero SP and sigcontext magic number is present */ 57 if (sc->sc_regs[_R_SP] == 0 || sc->sc_regs[_R_ZERO] != 0xACEDBADE) 58 goto err; 59 60 /* Ensure non-zero return value */ 61 if (val == 0) 62 val = 1; 63 64 /* 65 * Set _UC_{SET,CLR}STACK according to SS_ONSTACK. 66 * 67 * Restore the signal mask with sigprocmask() instead of _UC_SIGMASK, 68 * since libpthread may want to interpose on signal handling. 69 */ 70 uc.uc_flags = _UC_CPU | (sc->sc_onstack ? _UC_SETSTACK : _UC_CLRSTACK); 71 72 sigprocmask(SIG_SETMASK, &sc->sc_mask, NULL); 73 74 /* Clear uc_link */ 75 uc.uc_link = 0; 76 77 /* Save return value in context */ 78 uc.uc_mcontext.__gregs[_R_V0] = val; 79 80 /* Copy saved registers */ 81 uc.uc_mcontext.__gregs[_REG_S0] = sc->sc_regs[_R_S0]; 82 uc.uc_mcontext.__gregs[_REG_S1] = sc->sc_regs[_R_S1]; 83 uc.uc_mcontext.__gregs[_REG_S2] = sc->sc_regs[_R_S2]; 84 uc.uc_mcontext.__gregs[_REG_S3] = sc->sc_regs[_R_S3]; 85 uc.uc_mcontext.__gregs[_REG_S4] = sc->sc_regs[_R_S4]; 86 uc.uc_mcontext.__gregs[_REG_S5] = sc->sc_regs[_R_S5]; 87 uc.uc_mcontext.__gregs[_REG_S6] = sc->sc_regs[_R_S6]; 88 uc.uc_mcontext.__gregs[_REG_S7] = sc->sc_regs[_R_S7]; 89 uc.uc_mcontext.__gregs[_REG_S8] = sc->sc_regs[_R_S8]; 90 uc.uc_mcontext.__gregs[_REG_SP] = sc->sc_regs[_R_SP]; 91 uc.uc_mcontext.__gregs[_REG_RA] = sc->sc_regs[_R_RA]; 92 uc.uc_mcontext.__gregs[_REG_EPC] = sc->sc_pc; 93 94 /* Copy FP state */ 95 if (sc->sc_fpused) { 96 /* FP saved regs are $f20 .. $f31 */ 97 memcpy(&uc.uc_mcontext.__fpregs.__fp_r.__fp_regs[20], 98 &sc->sc_fpregs[20], 32 - 20); 99 uc.uc_mcontext.__fpregs.__fp_csr = 100 sc->sc_fpregs[_R_FSR - _FPBASE]; 101 /* XXX sc_fp_control */ 102 uc.uc_flags |= _UC_FPU; 103 } 104 105 setcontext(&uc); 106 err: 107 longjmperror(); 108 abort(); 109 /* NOTREACHED */ 110} 111