1/* $NetBSD: longjmp.c,v 1.6 2016/01/24 16:01:43 christos 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 * 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#include <machine/regnum.h> 40 41#define __LIBC12_SOURCE__ 42#include <setjmp.h> 43#include <compat/include/setjmp.h> 44 45void 46__longjmp14(jmp_buf env, int val) 47{ 48 struct sigcontext *sc = (void *)env; 49 ucontext_t uc; 50 51 /* Ensure non-zero SP and sigcontext magic number is present */ 52 if (sc->sc_regs[_R_SP] == 0 || sc->sc_regs[_R_ZERO] != (__register_t)0xACEDBADEU) 53 goto err; 54 55 /* Ensure non-zero return value */ 56 if (val == 0) 57 val = 1; 58 59 /* 60 * Set _UC_{SET,CLR}STACK according to SS_ONSTACK. 61 * 62 * Restore the signal mask with sigprocmask() instead of _UC_SIGMASK, 63 * since libpthread may want to interpose on signal handling. 64 */ 65 uc.uc_flags = _UC_CPU | (sc->sc_onstack ? _UC_SETSTACK : _UC_CLRSTACK); 66 67 sigprocmask(SIG_SETMASK, &sc->sc_mask, NULL); 68 69 /* Clear uc_link */ 70 uc.uc_link = 0; 71 72 /* Save return value in context */ 73 uc.uc_mcontext.__gregs[_REG_V0] = val; 74 75 /* Copy saved registers */ 76 uc.uc_mcontext.__gregs[_REG_S0] = sc->sc_regs[_R_S0]; 77 uc.uc_mcontext.__gregs[_REG_S1] = sc->sc_regs[_R_S1]; 78 uc.uc_mcontext.__gregs[_REG_S2] = sc->sc_regs[_R_S2]; 79 uc.uc_mcontext.__gregs[_REG_S3] = sc->sc_regs[_R_S3]; 80 uc.uc_mcontext.__gregs[_REG_S4] = sc->sc_regs[_R_S4]; 81 uc.uc_mcontext.__gregs[_REG_S5] = sc->sc_regs[_R_S5]; 82 uc.uc_mcontext.__gregs[_REG_S6] = sc->sc_regs[_R_S6]; 83 uc.uc_mcontext.__gregs[_REG_S7] = sc->sc_regs[_R_S7]; 84 uc.uc_mcontext.__gregs[_REG_S8] = sc->sc_regs[_R_S8]; 85#if defined(__mips_n32) || defined(__mips_n64) 86 uc.uc_mcontext.__gregs[_REG_GP] = sc->sc_regs[_R_GP]; 87#endif 88 uc.uc_mcontext.__gregs[_REG_SP] = sc->sc_regs[_R_SP]; 89 uc.uc_mcontext.__gregs[_REG_RA] = sc->sc_regs[_R_RA]; 90 uc.uc_mcontext.__gregs[_REG_EPC] = sc->sc_pc; 91 92 /* Copy FP state */ 93 if (sc->sc_fpused) { 94 /* FP saved regs are $f20 .. $f31 */ 95 memcpy(&uc.uc_mcontext.__fpregs.__fp_r.__fp_regs[20], 96 &sc->sc_fpregs[20], 32 - 20); 97 uc.uc_mcontext.__fpregs.__fp_csr = 98 sc->sc_fpregs[_R_FSR - _FPBASE]; 99 /* XXX sc_fp_control */ 100 uc.uc_flags |= _UC_FPU; 101 } 102 103 setcontext(&uc); 104 err: 105 longjmperror(); 106 abort(); 107 /* NOTREACHED */ 108} 109