1 /* $NetBSD: sig_machdep.c,v 1.28 2021/10/27 04:14:59 thorpej Exp $ */
2
3 /*-
4 * Copyright (c) 2002 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Matthew Fredette.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 /*
33 * Copyright (c) 1988 University of Utah.
34 * Copyright (c) 1982, 1986, 1990, 1993
35 * The Regents of the University of California. All rights reserved.
36 *
37 * This code is derived from software contributed to Berkeley by
38 * the Systems Programming Group of the University of Utah Computer
39 * Science Department.
40 *
41 * Redistribution and use in source and binary forms, with or without
42 * modification, are permitted provided that the following conditions
43 * are met:
44 * 1. Redistributions of source code must retain the above copyright
45 * notice, this list of conditions and the following disclaimer.
46 * 2. Redistributions in binary form must reproduce the above copyright
47 * notice, this list of conditions and the following disclaimer in the
48 * documentation and/or other materials provided with the distribution.
49 * 3. Neither the name of the University nor the names of its contributors
50 * may be used to endorse or promote products derived from this software
51 * without specific prior written permission.
52 *
53 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
54 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
55 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
56 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
57 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
58 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
59 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
61 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
62 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
63 * SUCH DAMAGE.
64 *
65 * from: Utah Hdr: machdep.c 1.74 92/12/20
66 * from: @(#)machdep.c 8.10 (Berkeley) 4/20/94
67 */
68
69 #include <sys/cdefs.h>
70 __KERNEL_RCSID(0, "$NetBSD: sig_machdep.c,v 1.28 2021/10/27 04:14:59 thorpej Exp $");
71
72 #include "opt_compat_netbsd.h"
73
74 #include <sys/param.h>
75 #include <sys/systm.h>
76 #include <sys/kernel.h>
77 #include <sys/proc.h>
78 #include <sys/signal.h>
79 #include <sys/signalvar.h>
80
81 #include <sys/mount.h>
82 #include <sys/syscallargs.h>
83
84 #include <machine/cpu.h>
85 #include <machine/pcb.h>
86 #include <machine/reg.h>
87 #include <machine/frame.h>
88
89 #ifdef DEBUG
90 int sigdebug = 0;
91 int sigpid = 0;
92 #define SDB_FOLLOW 0x01
93 #define SDB_KSTACK 0x02
94 #define SDB_FPSTATE 0x04
95 #endif
96
97 static void *getframe(struct lwp *, int, int *);
98 static void *
getframe(struct lwp * l,int sig,int * onstack)99 getframe(struct lwp *l, int sig, int *onstack)
100 {
101 struct proc *p = l->l_proc;
102 struct trapframe *tf = l->l_md.md_regs;
103
104 /* Do we need to jump onto the signal stack? */
105 *onstack = (l->l_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0
106 && (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0;
107 if (*onstack)
108 return (void *)HPPA_FRAME_ROUND(l->l_sigstk.ss_sp);
109 else
110 return (void *)HPPA_FRAME_ROUND(tf->tf_sp);
111 }
112
113 struct sigframe_siginfo {
114 siginfo_t sf_si;
115 ucontext_t sf_uc;
116 };
117
118 void
sendsig_siginfo(const struct ksiginfo * ksi,const sigset_t * mask)119 sendsig_siginfo(const struct ksiginfo *ksi, const sigset_t *mask)
120 {
121 struct lwp *l = curlwp;
122 struct proc *p = l->l_proc;
123 struct pcb *pcb = lwp_getpcb(l);
124 struct sigacts *ps = p->p_sigacts;
125 struct sigframe_siginfo *fp, frame;
126 struct trapframe *tf;
127 int sig = ksi->ksi_signo;
128 sig_t catcher = SIGACTION(p, sig).sa_handler;
129 int onstack, error;
130
131 fp = getframe(l, sig, &onstack);
132 tf = (struct trapframe *)l->l_md.md_regs;
133
134 /* Build stack frame for signal trampoline. */
135 switch (ps->sa_sigdesc[sig].sd_vers) {
136 default:
137 printf("sendsig_siginfo: bad version %d\n",
138 ps->sa_sigdesc[sig].sd_vers);
139 sigexit(l, SIGILL);
140 case __SIGTRAMP_SIGINFO_VERSION:
141 break;
142 }
143
144 memset(&frame, 0, sizeof(frame));
145 frame.sf_si._info = ksi->ksi_info;
146 frame.sf_uc.uc_flags = _UC_SIGMASK |
147 ((l->l_sigstk.ss_flags & SS_ONSTACK) ?
148 _UC_SETSTACK : _UC_CLRSTACK);
149 frame.sf_uc.uc_sigmask = *mask;
150 frame.sf_uc.uc_link = l->l_ctxlink;
151 sendsig_reset(l, sig);
152 mutex_exit(p->p_lock);
153 cpu_getmcontext(l, &frame.sf_uc.uc_mcontext, &frame.sf_uc.uc_flags);
154 error = copyout(&frame, fp, sizeof(frame));
155 mutex_enter(p->p_lock);
156
157 if (error != 0) {
158
159 /*
160 * Process has trashed its stack; give it an illegal
161 * instruction to halt it in its tracks.
162 */
163 sigexit(l, SIGILL);
164 /* NOTREACHED */
165 }
166
167 /*
168 * Set up the registers to invoke the signal trampoline.
169 */
170 tf->tf_arg0 = sig;
171 tf->tf_arg1 = (__greg_t)&fp->sf_si;
172 tf->tf_arg2 = (__greg_t)&fp->sf_uc;
173 tf->tf_r3 = (__greg_t)&fp->sf_uc;
174
175 fp++;
176 tf->tf_iisq_head = tf->tf_iisq_tail = pcb->pcb_space;
177 tf->tf_iioq_head =
178 (__greg_t)ps->sa_sigdesc[sig].sd_tramp | HPPA_PC_PRIV_USER;
179 tf->tf_iioq_tail = tf->tf_iioq_head + 4;
180 tf->tf_arg3 = (__greg_t)catcher;
181 tf->tf_sp = HPPA_FRAME_ROUND(fp);
182
183 /* Remember that we're now on the signal stack. */
184 if (onstack)
185 l->l_sigstk.ss_flags |= SS_ONSTACK;
186 }
187