diff options
Diffstat (limited to 'lib/libc/arm/gen/signalcontext.c')
-rw-r--r-- | lib/libc/arm/gen/signalcontext.c | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/lib/libc/arm/gen/signalcontext.c b/lib/libc/arm/gen/signalcontext.c new file mode 100644 index 0000000..bb9a54d --- /dev/null +++ b/lib/libc/arm/gen/signalcontext.c @@ -0,0 +1,78 @@ +/*- + * 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); +} |