diff options
Diffstat (limited to 'lib/libc/i386/gen/signalcontext.c')
| -rw-r--r-- | lib/libc/i386/gen/signalcontext.c | 79 |
1 files changed, 79 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..877b655 --- /dev/null +++ b/lib/libc/i386/gen/signalcontext.c @@ -0,0 +1,79 @@ +/*- + * 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. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> +#include <sys/ucontext.h> +#include <machine/psl.h> +#include <machine/sigframe.h> +#include <signal.h> +#include <strings.h> + +__weak_reference(__signalcontext, signalcontext); + +extern void _ctx_start(ucontext_t *, int argc, ...); + +int +__signalcontext(ucontext_t *ucp, int sig, __sighandler_t *func) +{ + register_t *p; + struct sigframe *sfp; + + /*- + * Set up stack. + * (n = sizeof(int)) + * 2n+sizeof(struct sigframe) ucp + * 2n struct sigframe + * 1n &func + * 0n &_ctx_start + */ + p = (register_t *)(void *)(intptr_t)ucp->uc_mcontext.mc_esp; + *--p = (register_t)(intptr_t)ucp; + p = (register_t *)((u_register_t)p & ~0xF); /* Align to 16 bytes. */ + p = (register_t *)((u_register_t)p - sizeof(struct sigframe)); + sfp = (struct sigframe *)p; + bzero(sfp, sizeof(struct sigframe)); + sfp->sf_signum = sig; + sfp->sf_siginfo = (register_t)(intptr_t)&sfp->sf_si; + sfp->sf_ucontext = (register_t)(intptr_t)&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 = (register_t)(intptr_t)func; + + /* + * Set up ucontext_t. + */ + ucp->uc_mcontext.mc_esi = ucp->uc_mcontext.mc_esp - sizeof(int); + ucp->uc_mcontext.mc_esp = (register_t)(intptr_t)p; + ucp->uc_mcontext.mc_eip = (register_t)(intptr_t)_ctx_start; + ucp->uc_mcontext.mc_eflags &= ~PSL_T; + ucp->uc_link = &sfp->sf_uc; + sigdelset(&ucp->uc_sigmask, sig); + return (0); +} |
