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 "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 #include <machine/regnum.h> 47 48 #define __LIBC12_SOURCE__ 49 #include <setjmp.h> 50 #include <compat/include/setjmp.h> 51 52 void 53 __longjmp14(jmp_buf env, int val) 54 { 55 struct sigcontext *sc = (void *)env; 56 ucontext_t uc; 57 58 /* Ensure non-zero SP and sigcontext magic number is present */ 59 if (sc->sc_regs[_R_SP] == 0 || sc->sc_regs[_R_ZERO] != 0xACEDBADE) 60 goto err; 61 62 /* Ensure non-zero return value */ 63 if (val == 0) 64 val = 1; 65 66 /* 67 * Set _UC_{SET,CLR}STACK according to SS_ONSTACK. 68 * 69 * Restore the signal mask with sigprocmask() instead of _UC_SIGMASK, 70 * since libpthread may want to interpose on signal handling. 71 */ 72 uc.uc_flags = _UC_CPU | (sc->sc_onstack ? _UC_SETSTACK : _UC_CLRSTACK); 73 74 sigprocmask(SIG_SETMASK, &sc->sc_mask, NULL); 75 76 /* Clear uc_link */ 77 uc.uc_link = 0; 78 79 /* Save return value in context */ 80 uc.uc_mcontext.__gregs[_R_V0] = val; 81 82 /* Copy saved registers */ 83 uc.uc_mcontext.__gregs[_REG_S0] = sc->sc_regs[_R_S0]; 84 uc.uc_mcontext.__gregs[_REG_S1] = sc->sc_regs[_R_S1]; 85 uc.uc_mcontext.__gregs[_REG_S2] = sc->sc_regs[_R_S2]; 86 uc.uc_mcontext.__gregs[_REG_S3] = sc->sc_regs[_R_S3]; 87 uc.uc_mcontext.__gregs[_REG_S4] = sc->sc_regs[_R_S4]; 88 uc.uc_mcontext.__gregs[_REG_S5] = sc->sc_regs[_R_S5]; 89 uc.uc_mcontext.__gregs[_REG_S6] = sc->sc_regs[_R_S6]; 90 uc.uc_mcontext.__gregs[_REG_S7] = sc->sc_regs[_R_S7]; 91 uc.uc_mcontext.__gregs[_REG_S8] = sc->sc_regs[_R_S8]; 92 uc.uc_mcontext.__gregs[_REG_SP] = sc->sc_regs[_R_SP]; 93 uc.uc_mcontext.__gregs[_REG_RA] = sc->sc_regs[_R_RA]; 94 uc.uc_mcontext.__gregs[_REG_EPC] = sc->sc_pc; 95 96 /* Copy FP state */ 97 if (sc->sc_fpused) { 98 /* FP saved regs are $f20 .. $f31 */ 99 memcpy(&uc.uc_mcontext.__fpregs.__fp_r.__fp_regs[20], 100 &sc->sc_fpregs[20], 32 - 20); 101 uc.uc_mcontext.__fpregs.__fp_csr = 102 sc->sc_fpregs[_R_FSR - _FPBASE]; 103 /* XXX sc_fp_control */ 104 uc.uc_flags |= _UC_FPU; 105 } 106 107 setcontext(&uc); 108 err: 109 longjmperror(); 110 abort(); 111 /* NOTREACHED */ 112 } 113