2 * Copyright (c) 2002 Jonathan Mini <mini@freebsd.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
30 #include <sys/param.h>
31 #include <sys/ucontext.h>
32 #include <machine/psl.h>
33 #include <machine/sigframe.h>
37 __weak_reference(__signalcontext, signalcontext);
39 extern void _ctx_start(ucontext_t *, int argc, ...);
42 __signalcontext(ucontext_t *ucp, int sig, __sighandler_t *func)
50 * 2n+sizeof(struct sigframe) ucp
55 p = (register_t *)(void *)(intptr_t)ucp->uc_mcontext.mc_esp;
56 *--p = (register_t)(intptr_t)ucp;
57 p = (register_t *)((u_register_t)p & ~0xF); /* Align to 16 bytes. */
58 p = (register_t *)((u_register_t)p - sizeof(struct sigframe));
59 sfp = (struct sigframe *)p;
60 bzero(sfp, sizeof(struct sigframe));
62 sfp->sf_siginfo = (register_t)(intptr_t)&sfp->sf_si;
63 sfp->sf_ucontext = (register_t)(intptr_t)&sfp->sf_uc;
64 sfp->sf_ahu.sf_action = (__siginfohandler_t *)func;
65 bcopy(ucp, &sfp->sf_uc, sizeof(ucontext_t));
66 sfp->sf_si.si_signo = sig;
67 *--p = (register_t)(intptr_t)func;
72 ucp->uc_mcontext.mc_esi = ucp->uc_mcontext.mc_esp - sizeof(int);
73 ucp->uc_mcontext.mc_esp = (register_t)(intptr_t)p;
74 ucp->uc_mcontext.mc_eip = (register_t)(intptr_t)_ctx_start;
75 ucp->uc_mcontext.mc_eflags &= ~PSL_T;
76 ucp->uc_link = &sfp->sf_uc;
77 sigdelset(&ucp->uc_sigmask, sig);