1 /* $NetBSD: __longjmp14.c,v 1.4 2008/04/28 20:22:55 martin 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 * 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 #define __LIBC12_SOURCE__ 40 #include <setjmp.h> 41 #include <compat/include/setjmp.h> 42 43 #include <stdio.h> 44 #include <unistd.h> 45 46 ssize_t _sys_write(int, void *, size_t); 47 48 void 49 __longjmp14(jmp_buf env, int val) 50 { 51 ucontext_t uc; 52 struct sigcontext *sc = (void *)env; 53 register_t *regs = (void *)(sc + 1); 54 register register_t dp __asm("r27"); 55 56 /* Ensure non-zero SP */ 57 if (sc->sc_sp == 0) 58 goto err; 59 60 /* Make return value non-zero */ 61 if (val == 0) 62 val = 1; 63 64 /* Copy callee-saved regs */ 65 regs -= 3; 66 uc.uc_mcontext.__gregs[3] = regs[3]; 67 uc.uc_mcontext.__gregs[4] = regs[4]; 68 uc.uc_mcontext.__gregs[5] = regs[5]; 69 uc.uc_mcontext.__gregs[6] = regs[6]; 70 uc.uc_mcontext.__gregs[7] = regs[7]; 71 uc.uc_mcontext.__gregs[8] = regs[8]; 72 uc.uc_mcontext.__gregs[9] = regs[9]; 73 uc.uc_mcontext.__gregs[10] = regs[10]; 74 uc.uc_mcontext.__gregs[11] = regs[11]; 75 uc.uc_mcontext.__gregs[12] = regs[12]; 76 uc.uc_mcontext.__gregs[13] = regs[13]; 77 uc.uc_mcontext.__gregs[14] = regs[14]; 78 uc.uc_mcontext.__gregs[15] = regs[15]; 79 uc.uc_mcontext.__gregs[16] = regs[16]; 80 uc.uc_mcontext.__gregs[17] = regs[17]; 81 uc.uc_mcontext.__gregs[18] = regs[18]; 82 83 /* Preserve the current value of DP */ 84 uc.uc_mcontext.__gregs[27] = dp; 85 86 /* Set the desired return value. */ 87 uc.uc_mcontext.__gregs[_REG_RET0] = val; 88 89 /* 90 * Set _UC_{SET,CLR}STACK according to SS_ONSTACK. 91 * 92 * Restore the signal mask with sigprocmask() instead of _UC_SIGMASK, 93 * since libpthread may want to interpose on signal handling. 94 */ 95 uc.uc_flags = _UC_CPU | (sc->sc_onstack ? _UC_SETSTACK : _UC_CLRSTACK); 96 97 sigprocmask(SIG_SETMASK, &sc->sc_mask, NULL); 98 99 /* Clear uc_link */ 100 uc.uc_link = 0; 101 102 /* Copy signal mask */ 103 uc.uc_sigmask = sc->sc_mask; 104 105 /* Copy special regs */ 106 uc.uc_mcontext.__gregs[_REG_PSW] = sc->sc_ps; 107 uc.uc_mcontext.__gregs[_REG_SP] = sc->sc_sp; 108 uc.uc_mcontext.__gregs[_REG_PCSQH] = sc->sc_pcsqh; 109 uc.uc_mcontext.__gregs[_REG_PCOQH] = sc->sc_pcoqh; 110 uc.uc_mcontext.__gregs[_REG_PCSQT] = sc->sc_pcsqt; 111 uc.uc_mcontext.__gregs[_REG_PCOQT] = sc->sc_pcoqt; 112 113 setcontext(&uc); 114 err: 115 longjmperror(); 116 abort(); 117 /* NOTREACHED */ 118 } 119