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 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