longjmp.c revision 1.2.8.2
1 1.2.8.2 martin /* $NetBSD: longjmp.c,v 1.2.8.2 2008/04/28 20:22:57 martin Exp $ */ 2 1.2.8.2 martin 3 1.2.8.2 martin /*- 4 1.2.8.2 martin * Copyright (c) 2003 The NetBSD Foundation, Inc. 5 1.2.8.2 martin * All rights reserved. 6 1.2.8.2 martin * 7 1.2.8.2 martin * This code is derived from software contributed to The NetBSD Foundation 8 1.2.8.2 martin * by Christian Limpach and Matt Thomas. 9 1.2.8.2 martin * 10 1.2.8.2 martin * Redistribution and use in source and binary forms, with or without 11 1.2.8.2 martin * modification, are permitted provided that the following conditions 12 1.2.8.2 martin * are met: 13 1.2.8.2 martin * 1. Redistributions of source code must retain the above copyright 14 1.2.8.2 martin * notice, this list of conditions and the following disclaimer. 15 1.2.8.2 martin * 2. Redistributions in binary form must reproduce the above copyright 16 1.2.8.2 martin * notice, this list of conditions and the following disclaimer in the 17 1.2.8.2 martin * documentation and/or other materials provided with the distribution. 18 1.2.8.2 martin * 19 1.2.8.2 martin * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 1.2.8.2 martin * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 1.2.8.2 martin * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 1.2.8.2 martin * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 1.2.8.2 martin * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 1.2.8.2 martin * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 1.2.8.2 martin * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 1.2.8.2 martin * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 1.2.8.2 martin * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 1.2.8.2 martin * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 1.2.8.2 martin * POSSIBILITY OF SUCH DAMAGE. 30 1.2.8.2 martin */ 31 1.2.8.2 martin 32 1.2.8.2 martin #include "namespace.h" 33 1.2.8.2 martin #include <sys/types.h> 34 1.2.8.2 martin #include <ucontext.h> 35 1.2.8.2 martin #include <signal.h> 36 1.2.8.2 martin #include <stdlib.h> 37 1.2.8.2 martin #include <string.h> 38 1.2.8.2 martin 39 1.2.8.2 martin #include <machine/regnum.h> 40 1.2.8.2 martin 41 1.2.8.2 martin #define __LIBC12_SOURCE__ 42 1.2.8.2 martin #include <setjmp.h> 43 1.2.8.2 martin #include <compat/include/setjmp.h> 44 1.2.8.2 martin 45 1.2.8.2 martin void 46 1.2.8.2 martin __longjmp14(jmp_buf env, int val) 47 1.2.8.2 martin { 48 1.2.8.2 martin struct sigcontext *sc = (void *)env; 49 1.2.8.2 martin ucontext_t uc; 50 1.2.8.2 martin 51 1.2.8.2 martin /* Ensure non-zero SP and sigcontext magic number is present */ 52 1.2.8.2 martin if (sc->sc_regs[_R_SP] == 0 || sc->sc_regs[_R_ZERO] != 0xACEDBADE) 53 1.2.8.2 martin goto err; 54 1.2.8.2 martin 55 1.2.8.2 martin /* Ensure non-zero return value */ 56 1.2.8.2 martin if (val == 0) 57 1.2.8.2 martin val = 1; 58 1.2.8.2 martin 59 1.2.8.2 martin /* 60 1.2.8.2 martin * Set _UC_{SET,CLR}STACK according to SS_ONSTACK. 61 1.2.8.2 martin * 62 1.2.8.2 martin * Restore the signal mask with sigprocmask() instead of _UC_SIGMASK, 63 1.2.8.2 martin * since libpthread may want to interpose on signal handling. 64 1.2.8.2 martin */ 65 1.2.8.2 martin uc.uc_flags = _UC_CPU | (sc->sc_onstack ? _UC_SETSTACK : _UC_CLRSTACK); 66 1.2.8.2 martin 67 1.2.8.2 martin sigprocmask(SIG_SETMASK, &sc->sc_mask, NULL); 68 1.2.8.2 martin 69 1.2.8.2 martin /* Clear uc_link */ 70 1.2.8.2 martin uc.uc_link = 0; 71 1.2.8.2 martin 72 1.2.8.2 martin /* Save return value in context */ 73 1.2.8.2 martin uc.uc_mcontext.__gregs[_R_V0] = val; 74 1.2.8.2 martin 75 1.2.8.2 martin /* Copy saved registers */ 76 1.2.8.2 martin uc.uc_mcontext.__gregs[_REG_S0] = sc->sc_regs[_R_S0]; 77 1.2.8.2 martin uc.uc_mcontext.__gregs[_REG_S1] = sc->sc_regs[_R_S1]; 78 1.2.8.2 martin uc.uc_mcontext.__gregs[_REG_S2] = sc->sc_regs[_R_S2]; 79 1.2.8.2 martin uc.uc_mcontext.__gregs[_REG_S3] = sc->sc_regs[_R_S3]; 80 1.2.8.2 martin uc.uc_mcontext.__gregs[_REG_S4] = sc->sc_regs[_R_S4]; 81 1.2.8.2 martin uc.uc_mcontext.__gregs[_REG_S5] = sc->sc_regs[_R_S5]; 82 1.2.8.2 martin uc.uc_mcontext.__gregs[_REG_S6] = sc->sc_regs[_R_S6]; 83 1.2.8.2 martin uc.uc_mcontext.__gregs[_REG_S7] = sc->sc_regs[_R_S7]; 84 1.2.8.2 martin uc.uc_mcontext.__gregs[_REG_S8] = sc->sc_regs[_R_S8]; 85 1.2.8.2 martin uc.uc_mcontext.__gregs[_REG_SP] = sc->sc_regs[_R_SP]; 86 1.2.8.2 martin uc.uc_mcontext.__gregs[_REG_RA] = sc->sc_regs[_R_RA]; 87 1.2.8.2 martin uc.uc_mcontext.__gregs[_REG_EPC] = sc->sc_pc; 88 1.2.8.2 martin 89 1.2.8.2 martin /* Copy FP state */ 90 1.2.8.2 martin if (sc->sc_fpused) { 91 1.2.8.2 martin /* FP saved regs are $f20 .. $f31 */ 92 1.2.8.2 martin memcpy(&uc.uc_mcontext.__fpregs.__fp_r.__fp_regs[20], 93 1.2.8.2 martin &sc->sc_fpregs[20], 32 - 20); 94 1.2.8.2 martin uc.uc_mcontext.__fpregs.__fp_csr = 95 1.2.8.2 martin sc->sc_fpregs[_R_FSR - _FPBASE]; 96 1.2.8.2 martin /* XXX sc_fp_control */ 97 1.2.8.2 martin uc.uc_flags |= _UC_FPU; 98 1.2.8.2 martin } 99 1.2.8.2 martin 100 1.2.8.2 martin setcontext(&uc); 101 1.2.8.2 martin err: 102 1.2.8.2 martin longjmperror(); 103 1.2.8.2 martin abort(); 104 1.2.8.2 martin /* NOTREACHED */ 105 1.2.8.2 martin } 106
Indexes created Tue Sep 30 20:09:53 GMT 2025