1129202Scognet/*- 2129202Scognet * Copyright (c) 2004 Olivier Houchard 3129202Scognet * All rights reserved. 4129202Scognet * 5129202Scognet * Redistribution and use in source and binary forms, with or without 6129202Scognet * modification, are permitted provided that the following conditions 7129202Scognet * are met: 8129202Scognet * 1. Redistributions of source code must retain the above copyright 9129202Scognet * notice, this list of conditions and the following disclaimer. 10129202Scognet * 2. Redistributions in binary form must reproduce the above copyright 11129202Scognet * notice, this list of conditions and the following disclaimer in the 12129202Scognet * documentation and/or other materials provided with the distribution. 13129202Scognet * 14129202Scognet * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15129202Scognet * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16129202Scognet * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17129202Scognet * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18129202Scognet * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19129202Scognet * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20129202Scognet * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21129202Scognet * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22129202Scognet * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23129202Scognet * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24129202Scognet * SUCH DAMAGE. 25129202Scognet */ 26129202Scognet 27129202Scognet#include <sys/cdefs.h> 28129202Scognet__FBSDID("$FreeBSD$"); 29129202Scognet 30129202Scognet#include <sys/param.h> 31129202Scognet#include <sys/signal.h> 32129202Scognet#include <sys/ucontext.h> 33129202Scognet 34129202Scognet#include <machine/frame.h> 35129202Scognet#include <machine/sigframe.h> 36129202Scognet 37129202Scognet#include <errno.h> 38129202Scognet#include <stdarg.h> 39129202Scognet#include <stdlib.h> 40129202Scognet#include <unistd.h> 41129202Scognet#include <strings.h> 42129202Scognet#include <signal.h> 43129202Scognet 44129202Scognet__weak_reference(__signalcontext, signalcontext); 45129202Scognet 46129202Scognetextern void _ctx_start(void); 47129202Scognet 48129202Scognetint 49129202Scognet__signalcontext(ucontext_t *ucp, int sig, __sighandler_t *func) 50129202Scognet{ 51129202Scognet struct sigframe *sfp; 52129202Scognet __greg_t *gr = ucp->uc_mcontext.__gregs; 53129202Scognet unsigned int *sp; 54129202Scognet 55137286Scognet sp = (unsigned int *)gr[_REG_SP]; 56129202Scognet 57129202Scognet sfp = (struct sigframe *)sp - 1; 58129202Scognet 59129202Scognet bzero(sfp, sizeof(*sfp)); 60129202Scognet bcopy(ucp, &sfp->sf_uc, sizeof(*ucp)); 61129202Scognet sfp->sf_si.si_signo = sig; 62129202Scognet 63137286Scognet gr[_REG_SP] = (__greg_t)sfp; 64129202Scognet /* Wipe out frame pointer. */ 65129202Scognet gr[_REG_FP] = 0; 66129202Scognet /* Arrange for return via the trampoline code. */ 67137286Scognet gr[_REG_PC] = (__greg_t)_ctx_start; 68137286Scognet gr[_REG_R4] = (__greg_t)func; 69137286Scognet gr[_REG_R5] = (__greg_t)ucp; 70137286Scognet gr[_REG_R0] = (__greg_t)sig; 71137286Scognet gr[_REG_R1] = (__greg_t)&sfp->sf_si; 72137286Scognet gr[_REG_R2] = (__greg_t)&sfp->sf_uc; 73129202Scognet 74129202Scognet ucp->uc_link = &sfp->sf_uc; 75129202Scognet sigdelset(&ucp->uc_sigmask, sig); 76129202Scognet 77129202Scognet return (0); 78129202Scognet} 79