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/*-
* Copyright (c) 2004 Olivier Houchard
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/signal.h>
#include <sys/ucontext.h>
#include <machine/frame.h>
#include <machine/sigframe.h>
#include <errno.h>
#include <stdarg.h>
#include <stdlib.h>
#include <unistd.h>
#include <strings.h>
#include <signal.h>
__weak_reference(__signalcontext, signalcontext);
extern void _ctx_start(void);
int
__signalcontext(ucontext_t *ucp, int sig, __sighandler_t *func)
{
struct sigframe *sfp;
__greg_t *gr = ucp->uc_mcontext.__gregs;
unsigned int *sp;
sp = (unsigned int *)gr[_REG_SP];
sfp = (struct sigframe *)sp - 1;
bzero(sfp, sizeof(*sfp));
bcopy(ucp, &sfp->sf_uc, sizeof(*ucp));
sfp->sf_si.si_signo = sig;
gr[_REG_SP] = (__greg_t)sfp;
/* Wipe out frame pointer. */
gr[_REG_FP] = 0;
/* Arrange for return via the trampoline code. */
gr[_REG_PC] = (__greg_t)_ctx_start;
gr[_REG_R4] = (__greg_t)func;
gr[_REG_R5] = (__greg_t)ucp;
gr[_REG_R0] = (__greg_t)sig;
gr[_REG_R1] = (__greg_t)&sfp->sf_si;
gr[_REG_R2] = (__greg_t)&sfp->sf_uc;
ucp->uc_link = &sfp->sf_uc;
sigdelset(&ucp->uc_sigmask, sig);
return (0);
}
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