diff options
author | mini <mini@FreeBSD.org> | 2002-09-17 03:11:07 +0000 |
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committer | mini <mini@FreeBSD.org> | 2002-09-17 03:11:07 +0000 |
commit | 4dbf5221afb8b3c6d5c93c628292c96910ec50b0 (patch) | |
tree | 79956090b0bc53cc021053aca4d749dbeef85ca2 /lib/libc | |
parent | b561096e479e036edf9bd0d01cf43172e015d481 (diff) | |
download | FreeBSD-src-4dbf5221afb8b3c6d5c93c628292c96910ec50b0.zip FreeBSD-src-4dbf5221afb8b3c6d5c93c628292c96910ec50b0.tar.gz |
Add signalcontext(), which adds a signal frame to a ucontext_t.
Diffstat (limited to 'lib/libc')
-rw-r--r-- | lib/libc/i386/gen/signalcontext.c | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/lib/libc/i386/gen/signalcontext.c b/lib/libc/i386/gen/signalcontext.c new file mode 100644 index 0000000..1e2df66 --- /dev/null +++ b/lib/libc/i386/gen/signalcontext.c @@ -0,0 +1,80 @@ +/*- + * 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); +} + |