79 lines
2.4 KiB
C
79 lines
2.4 KiB
C
/*-
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* Copyright (c) 2004 Olivier Houchard
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/signal.h>
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#include <sys/ucontext.h>
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#include <machine/frame.h>
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#include <machine/sigframe.h>
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#include <errno.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <strings.h>
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#include <signal.h>
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__weak_reference(__signalcontext, signalcontext);
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extern void _ctx_start(void);
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int
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__signalcontext(ucontext_t *ucp, int sig, __sighandler_t *func)
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{
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struct sigframe *sfp;
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__greg_t *gr = ucp->uc_mcontext.__gregs;
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unsigned int *sp;
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mcontext_t *mc;
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mc = &ucp->uc_mcontext;
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sp = (unsigned int *)
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(((uintptr_t)ucp->uc_stack.ss_sp + ucp->uc_stack.ss_size) & ~7);
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sfp = (struct sigframe *)sp - 1;
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bzero(sfp, sizeof(*sfp));
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bcopy(ucp, &sfp->sf_uc, sizeof(*ucp));
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sfp->sf_si.si_signo = sig;
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gr[_REG_SP] = (__greg_t)sp;
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/* Wipe out frame pointer. */
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gr[_REG_FP] = 0;
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/* Arrange for return via the trampoline code. */
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gr[_REG_LR] = (__greg_t)_ctx_start;
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gr[_REG_PC] = (__greg_t)func;
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gr[_REG_R0] = (__greg_t)ucp;
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ucp->uc_link = &sfp->sf_uc;
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sigdelset(&ucp->uc_sigmask, sig);
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return (0);
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}
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