1118655Sjake/*- 2118655Sjake * Copyright (c) 2003 Jake Burkholder. 3118655Sjake * All rights reserved. 4118655Sjake * 5118655Sjake * Redistribution and use in source and binary forms, with or without 6118655Sjake * modification, are permitted provided that the following conditions 7118655Sjake * are met: 8118655Sjake * 1. Redistributions of source code must retain the above copyright 9118655Sjake * notice, this list of conditions and the following disclaimer. 10118655Sjake * 2. Redistributions in binary form must reproduce the above copyright 11118655Sjake * notice, this list of conditions and the following disclaimer in the 12118655Sjake * documentation and/or other materials provided with the distribution. 13118655Sjake * 14118655Sjake * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15118655Sjake * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16118655Sjake * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17118655Sjake * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18118655Sjake * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19118655Sjake * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20118655Sjake * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21118655Sjake * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22118655Sjake * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23118655Sjake * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24118655Sjake * SUCH DAMAGE. 25118655Sjake */ 26118655Sjake 27118655Sjake#include <sys/cdefs.h> 28118655Sjake__FBSDID("$FreeBSD$"); 29118655Sjake 30118655Sjake#include <sys/param.h> 31118655Sjake#include <sys/ucontext.h> 32118655Sjake 33118655Sjake#include <machine/frame.h> 34118655Sjake#include <machine/sigframe.h> 35118655Sjake 36118655Sjake#include <errno.h> 37124182Snectar#include <signal.h> 38118655Sjake#include <stdarg.h> 39118655Sjake#include <stdlib.h> 40124182Snectar#include <strings.h> 41118655Sjake#include <unistd.h> 42118655Sjake 43118655Sjake__weak_reference(__signalcontext, signalcontext); 44118655Sjake 45118655Sjakeextern void _ctx_start(void); 46118655Sjake 47118655Sjakeint 48118655Sjake__signalcontext(ucontext_t *ucp, int sig, __sighandler_t *func) 49118655Sjake{ 50118655Sjake struct sigframe *sfp; 51118655Sjake struct frame *fp; 52118655Sjake mcontext_t *mc; 53118655Sjake 54118655Sjake mc = &ucp->uc_mcontext; 55253266Smarius sfp = (struct sigframe *)(mc->_mc_sp + SPOFF) - 1; 56118655Sjake fp = (struct frame *)sfp - 1; 57118655Sjake 58118655Sjake bzero(fp, sizeof(*fp)); 59118655Sjake 60118655Sjake bzero(sfp, sizeof(*sfp)); 61118655Sjake bcopy(ucp, &sfp->sf_uc, sizeof(*ucp)); 62118655Sjake sfp->sf_si.si_signo = sig; 63118655Sjake 64118655Sjake mc->mc_global[1] = (uint64_t)func; 65118655Sjake mc->mc_global[2] = (uint64_t)ucp; 66118655Sjake mc->mc_out[0] = sig; 67118655Sjake mc->mc_out[1] = (uint64_t)&sfp->sf_si; 68118655Sjake mc->mc_out[2] = (uint64_t)&sfp->sf_uc; 69118655Sjake mc->mc_out[6] = (uint64_t)fp - SPOFF; 70253266Smarius mc->_mc_tnpc = (uint64_t)_ctx_start + 4; 71253266Smarius mc->_mc_tpc = (uint64_t)_ctx_start; 72118655Sjake 73118655Sjake ucp->uc_link = &sfp->sf_uc; 74118655Sjake sigdelset(&ucp->uc_sigmask, sig); 75118655Sjake 76118655Sjake return (0); 77118655Sjake} 78