1 /* $NetBSD: __longjmp14.c,v 1.3 2005/12/24 21:41:01 perry 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 * 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 #define __LIBC12_SOURCE__ 47 #include <setjmp.h> 48 #include <compat/include/setjmp.h> 49 50 #include <stdio.h> 51 #include <unistd.h> 52 53 ssize_t _sys_write(int, void *, size_t); 54 55 void 56 __longjmp14(jmp_buf env, int val) 57 { 58 ucontext_t uc; 59 struct sigcontext *sc = (void *)env; 60 register_t *regs = (void *)(sc + 1); 61 register register_t dp __asm("r27"); 62 63 /* Ensure non-zero SP */ 64 if (sc->sc_sp == 0) 65 goto err; 66 67 /* Make return value non-zero */ 68 if (val == 0) 69 val = 1; 70 71 /* Copy callee-saved regs */ 72 regs -= 3; 73 uc.uc_mcontext.__gregs[3] = regs[3]; 74 uc.uc_mcontext.__gregs[4] = regs[4]; 75 uc.uc_mcontext.__gregs[5] = regs[5]; 76 uc.uc_mcontext.__gregs[6] = regs[6]; 77 uc.uc_mcontext.__gregs[7] = regs[7]; 78 uc.uc_mcontext.__gregs[8] = regs[8]; 79 uc.uc_mcontext.__gregs[9] = regs[9]; 80 uc.uc_mcontext.__gregs[10] = regs[10]; 81 uc.uc_mcontext.__gregs[11] = regs[11]; 82 uc.uc_mcontext.__gregs[12] = regs[12]; 83 uc.uc_mcontext.__gregs[13] = regs[13]; 84 uc.uc_mcontext.__gregs[14] = regs[14]; 85 uc.uc_mcontext.__gregs[15] = regs[15]; 86 uc.uc_mcontext.__gregs[16] = regs[16]; 87 uc.uc_mcontext.__gregs[17] = regs[17]; 88 uc.uc_mcontext.__gregs[18] = regs[18]; 89 90 /* Preserve the current value of DP */ 91 uc.uc_mcontext.__gregs[27] = dp; 92 93 /* Set the desired return value. */ 94 uc.uc_mcontext.__gregs[_REG_RET0] = val; 95 96 /* 97 * Set _UC_{SET,CLR}STACK according to SS_ONSTACK. 98 * 99 * Restore the signal mask with sigprocmask() instead of _UC_SIGMASK, 100 * since libpthread may want to interpose on signal handling. 101 */ 102 uc.uc_flags = _UC_CPU | (sc->sc_onstack ? _UC_SETSTACK : _UC_CLRSTACK); 103 104 sigprocmask(SIG_SETMASK, &sc->sc_mask, NULL); 105 106 /* Clear uc_link */ 107 uc.uc_link = 0; 108 109 /* Copy signal mask */ 110 uc.uc_sigmask = sc->sc_mask; 111 112 /* Copy special regs */ 113 uc.uc_mcontext.__gregs[_REG_PSW] = sc->sc_ps; 114 uc.uc_mcontext.__gregs[_REG_SP] = sc->sc_sp; 115 uc.uc_mcontext.__gregs[_REG_PCSQH] = sc->sc_pcsqh; 116 uc.uc_mcontext.__gregs[_REG_PCOQH] = sc->sc_pcoqh; 117 uc.uc_mcontext.__gregs[_REG_PCSQT] = sc->sc_pcsqt; 118 uc.uc_mcontext.__gregs[_REG_PCOQT] = sc->sc_pcoqt; 119 120 setcontext(&uc); 121 err: 122 longjmperror(); 123 abort(); 124 /* NOTREACHED */ 125 } 126