1 /* $NetBSD: longjmp.c,v 1.7 2012/03/17 21:35:06 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 #include <stdio.h> 39 #include <stddef.h> 40 41 #define __LIBC12_SOURCE__ 42 #include <setjmp.h> 43 #include <compat/include/setjmp.h> 44 45 typedef struct { 46 __greg_t g3; 47 __greg_t g6; 48 __greg_t g7; 49 __greg_t dummy; 50 __greg_t save_mask; 51 } __jmp_buf_regs_t; 52 53 /* 54 * setjmp.S uses hard coded offsets into the jump_buf, 55 * make sure any changes cause a compile failure here 56 */ 57 #ifndef lint /* XXX this is too much for lint */ 58 __CTASSERT(0x68 == offsetof(__jmp_buf_regs_t,save_mask) + 59 sizeof(struct sigcontext)); 60 __CTASSERT(sizeof(sigjmp_buf) >= sizeof(__jmp_buf_regs_t) + 61 sizeof(struct sigcontext)); 62 #endif 63 64 void 65 __longjmp14(jmp_buf env, int val) 66 { 67 struct sigcontext *sc = (void *)env; 68 __jmp_buf_regs_t *r = (void *)&sc[1]; 69 ucontext_t uc; 70 71 /* Ensure non-zero SP */ 72 if (sc->sc_sp == 0) 73 goto err; 74 75 /* 76 * Set _UC_CPU. No FPU data saved, so we can't restore 77 * that. Set _UC_{SET,CLR}STACK according to SS_ONSTACK 78 */ 79 memset(&uc, 0, sizeof(uc)); 80 uc.uc_flags = _UC_CPU | (sc->sc_onstack ? _UC_SETSTACK : _UC_CLRSTACK); 81 82 /* 83 * Set the signal mask - this is a weak symbol, so don't use 84 * _UC_SIGMASK in the mcontext, libpthread might override sigprocmask. 85 */ 86 sigprocmask(SIG_SETMASK, &sc->sc_mask, NULL); 87 88 /* Fill other registers */ 89 uc.uc_mcontext.__gregs[_REG_CCR] = sc->sc_tstate; 90 uc.uc_mcontext.__gregs[_REG_PC] = sc->sc_pc; 91 uc.uc_mcontext.__gregs[_REG_nPC] = sc->sc_pc+4; 92 uc.uc_mcontext.__gregs[_REG_G1] = sc->sc_g1; 93 uc.uc_mcontext.__gregs[_REG_G2] = sc->sc_o0; 94 uc.uc_mcontext.__gregs[_REG_G3] = r->g3; 95 uc.uc_mcontext.__gregs[_REG_G4] = 0; 96 uc.uc_mcontext.__gregs[_REG_G5] = 0; 97 uc.uc_mcontext.__gregs[_REG_G6] = r->g6; 98 uc.uc_mcontext.__gregs[_REG_G7] = r->g7; 99 uc.uc_mcontext.__gregs[_REG_O6] = sc->sc_sp; 100 101 102 /* Make return value non-zero */ 103 if (val == 0) 104 val = 1; 105 106 /* Save return value in context */ 107 uc.uc_mcontext.__gregs[_REG_O0] = val; 108 109 setcontext(&uc); 110 111 err: 112 longjmperror(); 113 abort(); 114 /* NOTREACHED */ 115 } 116