104 lines
3.1 KiB
C
104 lines
3.1 KiB
C
/*
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* Copyright (c) 2004 Marcel Moolenaar, Peter Grehan
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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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*
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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 ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 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/ucontext.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <strings.h>
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typedef void (*handler_t)(uint32_t, uint32_t, uint32_t);
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/* Prototypes */
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static void ctx_wrapper(ucontext_t *ucp, handler_t func, uint32_t sig,
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uint32_t sig_si, uint32_t sig_uc);
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__weak_reference(__signalcontext, signalcontext);
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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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siginfo_t *sig_si;
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ucontext_t *sig_uc;
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uintptr_t sp;
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/* Bail out if we don't have a valid ucontext pointer. */
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if (ucp == NULL)
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abort();
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/*
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* Build a 16-byte-aligned signal frame
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*/
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sp = (ucp->uc_mcontext.mc_gpr[1] - sizeof(ucontext_t)) & ~15UL;
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sig_uc = (ucontext_t *)sp;
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bcopy(ucp, sig_uc, sizeof(*sig_uc));
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sp = (sp - sizeof(siginfo_t)) & ~15UL;
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sig_si = (siginfo_t *)sp;
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bzero(sig_si, sizeof(*sig_si));
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sig_si->si_signo = sig;
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/*
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* Subtract 48 bytes from stack to allow for frameptr
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*/
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sp -= 6*sizeof(uint64_t);
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sp &= ~15UL;
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/*
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* Setup the ucontext of the signal handler.
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*/
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bzero(&ucp->uc_mcontext, sizeof(ucp->uc_mcontext));
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ucp->uc_link = sig_uc;
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sigdelset(&ucp->uc_sigmask, sig);
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ucp->uc_mcontext.mc_vers = _MC_VERSION;
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ucp->uc_mcontext.mc_len = sizeof(struct __mcontext);
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ucp->uc_mcontext.mc_srr0 = (uint64_t) ctx_wrapper;
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ucp->uc_mcontext.mc_gpr[1] = (uint64_t) sp;
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ucp->uc_mcontext.mc_gpr[3] = (uint64_t) func;
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ucp->uc_mcontext.mc_gpr[4] = (uint64_t) sig;
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ucp->uc_mcontext.mc_gpr[5] = (uint64_t) sig_si;
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ucp->uc_mcontext.mc_gpr[6] = (uint64_t) sig_uc;
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return (0);
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}
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static void
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ctx_wrapper(ucontext_t *ucp, handler_t func, uint32_t sig, uint32_t sig_si,
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uint32_t sig_uc)
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{
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(*func)(sig, sig_si, sig_uc);
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if (ucp->uc_link == NULL)
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exit(0);
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setcontext((const ucontext_t *)ucp->uc_link);
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/* should never get here */
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abort();
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/* NOTREACHED */
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}
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