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
kcsan_md_unsupported(vm_offset_t addr)39 kcsan_md_unsupported(vm_offset_t addr)
40 {
41 return false;
42 }
43
44 static inline bool
kcsan_md_is_avail(void)45 kcsan_md_is_avail(void)
46 {
47 return true;
48 }
49
50 static inline void
kcsan_md_disable_intrs(uint64_t * state)51 kcsan_md_disable_intrs(uint64_t *state)
52 {
53
54 *state = intr_disable();
55 }
56
57 static inline void
kcsan_md_enable_intrs(uint64_t * state)58 kcsan_md_enable_intrs(uint64_t *state)
59 {
60
61 intr_restore(*state);
62 }
63
64 static inline void
kcsan_md_delay(uint64_t us)65 kcsan_md_delay(uint64_t us)
66 {
67 DELAY(us);
68 }
69
70 static void
kcsan_md_unwind(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 uintptr_t sp;
80 int nsym;
81
82 __asm __volatile("mov %0, sp" : "=&r" (sp));
83
84 frame.sp = sp;
85 frame.fp = (uintptr_t)__builtin_frame_address(0);
86 frame.pc = (uintptr_t)kcsan_md_unwind;
87 nsym = 0;
88
89 while (1) {
90 if (!unwind_frame(curthread, &frame))
91 break;
92 if (!INKERNEL((vm_offset_t)frame.pc))
93 break;
94
95 #ifdef DDB
96 sym = db_search_symbol((vm_offset_t)frame.pc, DB_STGY_PROC,
97 &offset);
98 db_symbol_values(sym, &symname, NULL);
99 printf("#%d %p in %s+%#lx\n", nsym, (void *)frame.pc,
100 symname, offset);
101 #else
102 printf("#%d %p\n", nsym, (void *)frame.pc);
103 #endif
104 nsym++;
105
106 if (nsym >= 15) {
107 break;
108 }
109 }
110 }
111