1/*-
2 * Copyright (c) 2015 Dmitry Chagin
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: stable/11/sys/compat/linux/linux.c 315541 2017-03-19 10:37:03Z trasz $");
29
30#include <sys/param.h>
31#include <sys/systm.h>
32#include <sys/signalvar.h>
33
34#include <compat/linux/linux.h>
35
36
37static int bsd_to_linux_sigtbl[LINUX_SIGTBLSZ] = {
38	LINUX_SIGHUP,	/* SIGHUP */
39	LINUX_SIGINT,	/* SIGINT */
40	LINUX_SIGQUIT,	/* SIGQUIT */
41	LINUX_SIGILL,	/* SIGILL */
42	LINUX_SIGTRAP,	/* SIGTRAP */
43	LINUX_SIGABRT,	/* SIGABRT */
44	0,		/* SIGEMT */
45	LINUX_SIGFPE,	/* SIGFPE */
46	LINUX_SIGKILL,	/* SIGKILL */
47	LINUX_SIGBUS,	/* SIGBUS */
48	LINUX_SIGSEGV,	/* SIGSEGV */
49	LINUX_SIGSYS,	/* SIGSYS */
50	LINUX_SIGPIPE,	/* SIGPIPE */
51	LINUX_SIGALRM,	/* SIGALRM */
52	LINUX_SIGTERM,	/* SIGTERM */
53	LINUX_SIGURG,	/* SIGURG */
54	LINUX_SIGSTOP,	/* SIGSTOP */
55	LINUX_SIGTSTP,	/* SIGTSTP */
56	LINUX_SIGCONT,	/* SIGCONT */
57	LINUX_SIGCHLD,	/* SIGCHLD */
58	LINUX_SIGTTIN,	/* SIGTTIN */
59	LINUX_SIGTTOU,	/* SIGTTOU */
60	LINUX_SIGIO,	/* SIGIO */
61	LINUX_SIGXCPU,	/* SIGXCPU */
62	LINUX_SIGXFSZ,	/* SIGXFSZ */
63	LINUX_SIGVTALRM,/* SIGVTALRM */
64	LINUX_SIGPROF,	/* SIGPROF */
65	LINUX_SIGWINCH,	/* SIGWINCH */
66	0,		/* SIGINFO */
67	LINUX_SIGUSR1,	/* SIGUSR1 */
68	LINUX_SIGUSR2	/* SIGUSR2 */
69};
70
71static int linux_to_bsd_sigtbl[LINUX_SIGTBLSZ] = {
72	SIGHUP,		/* LINUX_SIGHUP */
73	SIGINT,		/* LINUX_SIGINT */
74	SIGQUIT,	/* LINUX_SIGQUIT */
75	SIGILL,		/* LINUX_SIGILL */
76	SIGTRAP,	/* LINUX_SIGTRAP */
77	SIGABRT,	/* LINUX_SIGABRT */
78	SIGBUS,		/* LINUX_SIGBUS */
79	SIGFPE,		/* LINUX_SIGFPE */
80	SIGKILL,	/* LINUX_SIGKILL */
81	SIGUSR1,	/* LINUX_SIGUSR1 */
82	SIGSEGV,	/* LINUX_SIGSEGV */
83	SIGUSR2,	/* LINUX_SIGUSR2 */
84	SIGPIPE,	/* LINUX_SIGPIPE */
85	SIGALRM,	/* LINUX_SIGALRM */
86	SIGTERM,	/* LINUX_SIGTERM */
87	SIGBUS,		/* LINUX_SIGSTKFLT */
88	SIGCHLD,	/* LINUX_SIGCHLD */
89	SIGCONT,	/* LINUX_SIGCONT */
90	SIGSTOP,	/* LINUX_SIGSTOP */
91	SIGTSTP,	/* LINUX_SIGTSTP */
92	SIGTTIN,	/* LINUX_SIGTTIN */
93	SIGTTOU,	/* LINUX_SIGTTOU */
94	SIGURG,		/* LINUX_SIGURG */
95	SIGXCPU,	/* LINUX_SIGXCPU */
96	SIGXFSZ,	/* LINUX_SIGXFSZ */
97	SIGVTALRM,	/* LINUX_SIGVTALARM */
98	SIGPROF,	/* LINUX_SIGPROF */
99	SIGWINCH,	/* LINUX_SIGWINCH */
100	SIGIO,		/* LINUX_SIGIO */
101	/*
102	 * FreeBSD does not have SIGPWR signal, map Linux SIGPWR signal
103	 * to the first unused FreeBSD signal number. Since Linux supports
104	 * signals from 1 to 64 we are ok here as our SIGRTMIN = 65.
105	 */
106	SIGRTMIN,	/* LINUX_SIGPWR */
107	SIGSYS		/* LINUX_SIGSYS */
108};
109
110/*
111 * Map Linux RT signals to the FreeBSD RT signals.
112 */
113static inline int
114linux_to_bsd_rt_signal(int sig)
115{
116
117	return (SIGRTMIN + 1 + sig - LINUX_SIGRTMIN);
118}
119
120static inline int
121bsd_to_linux_rt_signal(int sig)
122{
123
124	return (sig - SIGRTMIN - 1 + LINUX_SIGRTMIN);
125}
126
127int
128linux_to_bsd_signal(int sig)
129{
130
131	KASSERT(sig > 0 && sig <= LINUX_SIGRTMAX, ("invalid Linux signal %d\n", sig));
132
133	if (sig < LINUX_SIGRTMIN)
134		return (linux_to_bsd_sigtbl[_SIG_IDX(sig)]);
135
136	return (linux_to_bsd_rt_signal(sig));
137}
138
139int
140bsd_to_linux_signal(int sig)
141{
142
143	if (sig <= LINUX_SIGTBLSZ)
144		return (bsd_to_linux_sigtbl[_SIG_IDX(sig)]);
145	if (sig == SIGRTMIN)
146		return (LINUX_SIGPWR);
147
148	return (bsd_to_linux_rt_signal(sig));
149}
150
151int
152linux_to_bsd_sigaltstack(int lsa)
153{
154	int bsa = 0;
155
156	if (lsa & LINUX_SS_DISABLE)
157		bsa |= SS_DISABLE;
158	/*
159	 * Linux ignores SS_ONSTACK flag for ss
160	 * parameter while FreeBSD prohibits it.
161	 */
162	return (bsa);
163}
164
165int
166bsd_to_linux_sigaltstack(int bsa)
167{
168	int lsa = 0;
169
170	if (bsa & SS_DISABLE)
171		lsa |= LINUX_SS_DISABLE;
172	if (bsa & SS_ONSTACK)
173		lsa |= LINUX_SS_ONSTACK;
174	return (lsa);
175}
176
177void
178linux_to_bsd_sigset(l_sigset_t *lss, sigset_t *bss)
179{
180	int b, l;
181
182	SIGEMPTYSET(*bss);
183	for (l = 1; l <= LINUX_SIGRTMAX; l++) {
184		if (LINUX_SIGISMEMBER(*lss, l)) {
185			b = linux_to_bsd_signal(l);
186			if (b)
187				SIGADDSET(*bss, b);
188		}
189	}
190}
191
192void
193bsd_to_linux_sigset(sigset_t *bss, l_sigset_t *lss)
194{
195	int b, l;
196
197	LINUX_SIGEMPTYSET(*lss);
198	for (b = 1; b <= SIGRTMAX; b++) {
199		if (SIGISMEMBER(*bss, b)) {
200			l = bsd_to_linux_signal(b);
201			if (l)
202				LINUX_SIGADDSET(*lss, l);
203		}
204	}
205}
206