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 36 static inline bool 37 kcsan_md_unsupported(vm_offset_t addr) 38 { 39 return false; 40 } 41 42 static inline bool 43 kcsan_md_is_avail(void) 44 { 45 return true; 46 } 47 48 static inline void 49 kcsan_md_disable_intrs(uint64_t *state) 50 { 51 52 *state = intr_disable(); 53 } 54 55 static inline void 56 kcsan_md_enable_intrs(uint64_t *state) 57 { 58 59 intr_restore(*state); 60 } 61 62 static inline void 63 kcsan_md_delay(uint64_t us) 64 { 65 DELAY(us); 66 } 67 68 static void 69 kcsan_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 } 105