xref: /freebsd/sys/arm64/include/csan.h (revision 88e852c0b5c872b1a3234515623104ae61b60773)
1 /*	$NetBSD: csan.h,v 1.2 2019/11/06 06:57:22 maxv Exp $	*/
2 
3 /*
4  * Copyright (c) 2019 The NetBSD Foundation, Inc.
5  * All rights reserved.
6  *
7  * This code is derived from software contributed to The NetBSD Foundation
8  * by Maxime Villard.
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  * $FreeBSD$
32  */
33 
34 #include <machine/cpufunc.h>
35 #include <machine/stack.h>
36 #include <machine/vmparam.h>
37 
38 static inline bool
39 kcsan_md_unsupported(vm_offset_t addr)
40 {
41 	return false;
42 }
43 
44 static inline bool
45 kcsan_md_is_avail(void)
46 {
47 	return true;
48 }
49 
50 static inline void
51 kcsan_md_disable_intrs(uint64_t *state)
52 {
53 
54 	*state = intr_disable();
55 }
56 
57 static inline void
58 kcsan_md_enable_intrs(uint64_t *state)
59 {
60 
61 	intr_restore(*state);
62 }
63 
64 static inline void
65 kcsan_md_delay(uint64_t us)
66 {
67 	DELAY(us);
68 }
69 
70 static void
71 kcsan_md_unwind(void)
72 {
73 #ifdef DDB
74 	c_db_sym_t sym;
75 	db_expr_t offset;
76 	const char *symname;
77 #endif
78 	struct unwind_state frame;
79 	int nsym;
80 
81 	frame.fp = (uintptr_t)__builtin_frame_address(0);
82 	frame.pc = (uintptr_t)kcsan_md_unwind;
83 	nsym = 0;
84 
85 	while (1) {
86 		if (!unwind_frame(curthread, &frame))
87 			break;
88 		if (!INKERNEL((vm_offset_t)frame.pc))
89 			break;
90 
91 #ifdef DDB
92 		sym = db_search_symbol((vm_offset_t)frame.pc, DB_STGY_PROC,
93 		    &offset);
94 		db_symbol_values(sym, &symname, NULL);
95 		printf("#%d %p in %s+%#lx\n", nsym, (void *)frame.pc,
96 		    symname, offset);
97 #else
98 		printf("#%d %p\n", nsym, (void *)frame.pc);
99 #endif
100 		nsym++;
101 
102 		if (nsym >= 15) {
103 			break;
104 		}
105 	}
106 }
107