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
32#include <machine/cpufunc.h>
33#include <machine/stack.h>
34#include <machine/vmparam.h>
35
36static inline bool
37kcsan_md_unsupported(vm_offset_t addr)
38{
39 return false;
40}
41
42static inline bool
43kcsan_md_is_avail(void)
44{
45 return true;
46}
47
48static inline void
49kcsan_md_disable_intrs(uint64_t *state)
50{
51
52 *state = intr_disable();
53}
54
55static inline void
56kcsan_md_enable_intrs(uint64_t *state)
57{
58
59 intr_restore(*state);
60}
61
62static inline void
63kcsan_md_delay(uint64_t us)
64{
65 DELAY(us);
66}
67
68static void
69kcsan_md_unwind(void)
70{
71#ifdef DDB
72 c_db_sym_t sym;
73 db_expr_t offset;
74 const char *symname;
75#endif
76 struct unwind_state frame;
77 int nsym;
78
79 frame.fp = (uintptr_t)__builtin_frame_address(0);
80 frame.pc = (uintptr_t)kcsan_md_unwind;
81 nsym = 0;
82
83 while (1) {
84 if (!unwind_frame(curthread, &frame))
85 break;
86 if (!INKERNEL((vm_offset_t)frame.pc))
87 break;
88
89#ifdef DDB
90 sym = db_search_symbol((vm_offset_t)frame.pc, DB_STGY_PROC,
91 &offset);
92 db_symbol_values(sym, &symname, NULL);
93 printf("#%d %p in %s+%#lx\n", nsym, (void *)frame.pc,
94 symname, offset);
95#else
96 printf("#%d %p\n", nsym, (void *)frame.pc);
97#endif
98 nsym++;
99
100 if (nsym >= 15) {
101 break;
102 }
103 }
104}