longjmp.c revision 1.2.8.2
1 1.2.8.2 martin /* $NetBSD: longjmp.c,v 1.2.8.2 2008/04/28 20:22:58 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. 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 #define __LIBC12_SOURCE__ 40 1.2.8.2 martin #include <setjmp.h> 41 1.2.8.2 martin #include <compat/include/setjmp.h> 42 1.2.8.2 martin 43 1.2.8.2 martin /* 44 1.2.8.2 martin * Use setcontext to reload the stack pointer, program counter <pc,npc>, and 45 1.2.8.2 martin * set the return value in %o0. The %i and %l registers will be reloaded 46 1.2.8.2 martin * from the place to which %sp points. 47 1.2.8.2 martin */ 48 1.2.8.2 martin void 49 1.2.8.2 martin __longjmp14(jmp_buf env, int val) 50 1.2.8.2 martin { 51 1.2.8.2 martin struct sigcontext *sc = (void *)env; 52 1.2.8.2 martin ucontext_t uc; 53 1.2.8.2 martin 54 1.2.8.2 martin /* Ensure non-zero SP */ 55 1.2.8.2 martin if (sc->sc_sp == 0) 56 1.2.8.2 martin goto err; 57 1.2.8.2 martin 58 1.2.8.2 martin /* Initialise the fields we're going to use */ 59 1.2.8.2 martin uc.uc_link = 0; 60 1.2.8.2 martin 61 1.2.8.2 martin /* 62 1.2.8.2 martin * Set _UC_{SET,CLR}STACK according to SS_ONSTACK. 63 1.2.8.2 martin * 64 1.2.8.2 martin * Restore the signal mask with sigprocmask() instead of _UC_SIGMASK, 65 1.2.8.2 martin * since libpthread may want to interpose on signal handling. 66 1.2.8.2 martin */ 67 1.2.8.2 martin uc.uc_flags = _UC_CPU | (sc->sc_onstack ? _UC_SETSTACK : _UC_CLRSTACK); 68 1.2.8.2 martin 69 1.2.8.2 martin sigprocmask(SIG_SETMASK, &sc->sc_mask, NULL); 70 1.2.8.2 martin 71 1.2.8.2 martin /* Extract PSR, PC, NPC and SP from jmp_buf */ 72 1.2.8.2 martin uc.uc_mcontext.__gregs[_REG_PSR] = sc->sc_psr; 73 1.2.8.2 martin uc.uc_mcontext.__gregs[_REG_PC] = sc->sc_pc; 74 1.2.8.2 martin uc.uc_mcontext.__gregs[_REG_nPC] = sc->sc_npc; 75 1.2.8.2 martin uc.uc_mcontext.__gregs[_REG_O6] = sc->sc_sp; 76 1.2.8.2 martin 77 1.2.8.2 martin /* Set the return value; make sure it's non-zero */ 78 1.2.8.2 martin uc.uc_mcontext.__gregs[_REG_O0] = (val != 0 ? val : 1); 79 1.2.8.2 martin 80 1.2.8.2 martin setcontext(&uc); 81 1.2.8.2 martin 82 1.2.8.2 martin err: 83 1.2.8.2 martin longjmperror(); 84 1.2.8.2 martin abort(); 85 1.2.8.2 martin /* NOTREACHED */ 86 1.2.8.2 martin } 87
Indexes created Tue Sep 30 20:09:53 GMT 2025