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