1/*- 2 * Copyright (c) 2003 Jake Burkholder. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD$"); 29 30#include <sys/param.h> 31#include <sys/ucontext.h> 32 33#include <machine/frame.h> 34#include <machine/sigframe.h> 35 36#include <errno.h> 37#include <signal.h> 38#include <stdarg.h> 39#include <stdlib.h> 40#include <strings.h> 41#include <unistd.h> 42 43__weak_reference(__signalcontext, signalcontext); 44 45extern void _ctx_start(void); 46 47int 48__signalcontext(ucontext_t *ucp, int sig, __sighandler_t *func) 49{ 50 struct sigframe *sfp; 51 struct frame *fp; 52 mcontext_t *mc; 53 54 mc = &ucp->uc_mcontext; 55 sfp = (struct sigframe *)(mc->_mc_sp + SPOFF) - 1; 56 fp = (struct frame *)sfp - 1; 57 58 bzero(fp, sizeof(*fp)); 59 60 bzero(sfp, sizeof(*sfp)); 61 bcopy(ucp, &sfp->sf_uc, sizeof(*ucp)); 62 sfp->sf_si.si_signo = sig; 63 64 mc->mc_global[1] = (uint64_t)func; 65 mc->mc_global[2] = (uint64_t)ucp; 66 mc->mc_out[0] = sig; 67 mc->mc_out[1] = (uint64_t)&sfp->sf_si; 68 mc->mc_out[2] = (uint64_t)&sfp->sf_uc; 69 mc->mc_out[6] = (uint64_t)fp - SPOFF; 70 mc->_mc_tnpc = (uint64_t)_ctx_start + 4; 71 mc->_mc_tpc = (uint64_t)_ctx_start; 72 73 ucp->uc_link = &sfp->sf_uc; 74 sigdelset(&ucp->uc_sigmask, sig); 75 76 return (0); 77} 78