122 lines
3.7 KiB
C
122 lines
3.7 KiB
C
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/*
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* Copyright (c) 2003 Marcel Moolenaar
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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/types.h>
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#include <sys/ucontext.h>
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#include <machine/fpu.h>
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#include <signal.h>
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#include <stdio.h>
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#include <strings.h>
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struct fdesc {
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uint64_t ip;
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uint64_t gp;
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};
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typedef void (*handler_t)(uint64_t, uint64_t, uint64_t);
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static __inline uint64_t *
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spill(uint64_t *bsp, uint64_t arg)
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{
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*bsp++ = arg;
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if (((intptr_t)bsp & 0x1ff) == 0x1f8)
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*bsp++ = 0;
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return (bsp);
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}
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static void
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ctx_wrapper(ucontext_t *ucp, handler_t func, uint64_t *args)
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{
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(*func)(args[0], args[1], args[2]);
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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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__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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uint64_t *args, *bsp;
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siginfo_t *sig_si;
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ucontext_t *sig_uc;
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uint64_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 signal frame and copy the arguments of signal handler
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* 'func' onto the (memory) stack. We only need 3 arguments, but
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* we create room for 4 so that we are 16-byte aligned.
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*/
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sp = (ucp->uc_mcontext.mc_special.sp - 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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sp -= 4 * sizeof(uint64_t);
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args = (uint64_t*)sp;
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args[0] = sig;
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args[1] = (intptr_t)sig_si;
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args[2] = (intptr_t)sig_uc;
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/*
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* Push (spill) the arguments of the context wrapper onto the register
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* stack. They get loaded by the RSE on a context switch.
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*/
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bsp = (uint64_t*)ucp->uc_mcontext.mc_special.bspstore;
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bsp = spill(bsp, (intptr_t)ucp);
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bsp = spill(bsp, (intptr_t)func);
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bsp = spill(bsp, (intptr_t)args);
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/*
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* Setup the ucontext of the signal handler.
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*/
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memset(&ucp->uc_mcontext, 0, 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_special.sp = (intptr_t)args - 16;
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ucp->uc_mcontext.mc_special.bspstore = (intptr_t)bsp;
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ucp->uc_mcontext.mc_special.pfs = (3 << 7) | 3;
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ucp->uc_mcontext.mc_special.rsc = 0xf;
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ucp->uc_mcontext.mc_special.rp = ((struct fdesc*)ctx_wrapper)->ip;
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ucp->uc_mcontext.mc_special.gp = ((struct fdesc*)ctx_wrapper)->gp;
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ucp->uc_mcontext.mc_special.fpsr = IA64_FPSR_DEFAULT;
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return (0);
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}
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