2 * Copyright (c) 2003 Marcel Moolenaar
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
30 #include <sys/types.h>
31 #include <sys/ucontext.h>
32 #include <machine/fpu.h>
44 typedef void (*handler_t)(uint64_t, uint64_t, uint64_t);
46 static __inline uint64_t *
47 spill(uint64_t *bsp, uint64_t arg)
50 if (((intptr_t)bsp & 0x1ff) == 0x1f8)
56 ctx_wrapper(ucontext_t *ucp, handler_t func, uint64_t *args)
59 (*func)(args[0], args[1], args[2]);
60 if (ucp->uc_link == NULL)
62 setcontext((const ucontext_t *)ucp->uc_link);
63 /* should never get here */
68 __weak_reference(__signalcontext, signalcontext);
71 __signalcontext(ucontext_t *ucp, int sig, __sighandler_t *func)
78 /* Bail out if we don't have a valid ucontext pointer. */
83 * Build a signal frame and copy the arguments of signal handler
84 * 'func' onto the (memory) stack. We only need 3 arguments, but
85 * we create room for 4 so that we are 16-byte aligned.
87 sp = (ucp->uc_mcontext.mc_special.sp - sizeof(ucontext_t)) & ~15UL;
88 sig_uc = (ucontext_t*)sp;
89 bcopy(ucp, sig_uc, sizeof(*sig_uc));
90 sp = (sp - sizeof(siginfo_t)) & ~15UL;
91 sig_si = (siginfo_t*)sp;
92 bzero(sig_si, sizeof(*sig_si));
93 sig_si->si_signo = sig;
94 sp -= 4 * sizeof(uint64_t);
97 args[1] = (intptr_t)sig_si;
98 args[2] = (intptr_t)sig_uc;
101 * Push (spill) the arguments of the context wrapper onto the register
102 * stack. They get loaded by the RSE on a context switch.
104 bsp = (uint64_t*)ucp->uc_mcontext.mc_special.bspstore;
105 bsp = spill(bsp, (intptr_t)ucp);
106 bsp = spill(bsp, (intptr_t)func);
107 bsp = spill(bsp, (intptr_t)args);
110 * Setup the ucontext of the signal handler.
112 memset(&ucp->uc_mcontext, 0, sizeof(ucp->uc_mcontext));
113 ucp->uc_link = sig_uc;
114 sigdelset(&ucp->uc_sigmask, sig);
115 ucp->uc_mcontext.mc_special.sp = (intptr_t)args - 16;
116 ucp->uc_mcontext.mc_special.bspstore = (intptr_t)bsp;
117 ucp->uc_mcontext.mc_special.pfs = (3 << 7) | 3;
118 ucp->uc_mcontext.mc_special.rsc = 0xf;
119 ucp->uc_mcontext.mc_special.rp = ((struct fdesc*)ctx_wrapper)->ip;
120 ucp->uc_mcontext.mc_special.gp = ((struct fdesc*)ctx_wrapper)->gp;
121 ucp->uc_mcontext.mc_special.fpsr = IA64_FPSR_DEFAULT;