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Add signalcontext(), which adds a signal frame to a ucontext_t.

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This commit is contained in:
Jonathan Mini 2002-09-17 03:11:07 +00:00
parent 760bbf7d6d
commit 1d6e1c66b2
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=103442
1 changed files with 80 additions and 0 deletions
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lib/libc/i386/gen/signalcontext.c Normal file
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/*-
* Copyright (c) 2002 Jonathan Mini <mini@freebsd.org>
* 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.
*
* $FreeBSD$
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD");
#include <sys/param.h>
#include <sys/signal.h>
#include <sys/signalvar.h>
#include <sys/ucontext.h>
#include <machine/psl.h>
#include <machine/sigframe.h>
extern void _ctx_start(ucontext_t *, int argc, ...);
int
signalcontext(ucontext_t *ucp, int sig, __sighandler_t *func)
{
struct sigframe *sfp;
int *p;
/*
* Set up stack.
* (n = sizeof(int))
* 2n+sizeof(struct sigframe) ucp
* 2n struct sigframe
* 1n &func
* 0n &_ctx_start
*/
p = (int *)ucp->uc_mcontext.mc_esp;
*--p = (int)ucp;
p -= sizeof(struct sigframe);
sfp = (struct sigframe *)p;
bzero(sfp, sizeof(struct sigframe));
sfp->sf_signum = sig;
sfp->sf_siginfo = (int)&sfp->sf_si;
sfp->sf_ucontext = (int)&sfp->sf_uc;
sfp->sf_ahu.sf_action = (__siginfohandler_t *)func;
bcopy(ucp, &sfp->sf_uc, sizeof(ucontext_t));
sfp->sf_si.si_signo = sig;
*--p = (int)func;
/*
* Set up ucontext_t.
*/
ucp->uc_mcontext.mc_ebp = ucp->uc_mcontext.mc_esp - sizeof(int);
ucp->uc_mcontext.mc_esp = (int)p;
ucp->uc_mcontext.mc_eip = (int)_ctx_start;
ucp->uc_mcontext.mc_eflags &= ~PSL_T;
ucp->uc_link = &sfp->sf_uc;
SIGDELSET(ucp->uc_sigmask, sig);
return (0);
}