1 /*- 2 * Copyright (c) 2005 Antoine Brodin 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include <sys/param.h> 31 #include <sys/kernel.h> 32 #ifdef KTR 33 #include <sys/ktr.h> 34 #endif 35 #include <sys/linker.h> 36 #include <sys/malloc.h> 37 #include <sys/sbuf.h> 38 #include <sys/stack.h> 39 #include <sys/systm.h> 40 41 MALLOC_DEFINE(M_STACK, "stack", "Stack Traces"); 42 43 static void stack_symbol(vm_offset_t pc, const char **name, long *offset); 44 45 struct stack * 46 stack_create(void) 47 { 48 struct stack *st; 49 50 st = malloc(sizeof *st, M_STACK, M_WAITOK | M_ZERO); 51 return (st); 52 } 53 54 void 55 stack_destroy(struct stack *st) 56 { 57 58 free(st, M_STACK); 59 } 60 61 int 62 stack_put(struct stack *st, vm_offset_t pc) 63 { 64 65 if (st->depth < STACK_MAX) { 66 st->pcs[st->depth++] = pc; 67 return (0); 68 } else 69 return (-1); 70 } 71 72 void 73 stack_copy(struct stack *src, struct stack *dst) 74 { 75 76 *dst = *src; 77 } 78 79 void 80 stack_zero(struct stack *st) 81 { 82 83 bzero(st, sizeof *st); 84 } 85 86 void 87 stack_print(struct stack *st) 88 { 89 const char *name; 90 long offset; 91 int i; 92 93 KASSERT(st->depth <= STACK_MAX, ("bogus stack")); 94 for (i = 0; i < st->depth; i++) { 95 stack_symbol(st->pcs[i], &name, &offset); 96 printf("#%d %p at %s+%#lx\n", i, (void *)st->pcs[i], 97 name, offset); 98 } 99 } 100 101 void 102 stack_sbuf_print(struct sbuf *sb, struct stack *st) 103 { 104 const char *name; 105 long offset; 106 int i; 107 108 KASSERT(st->depth <= STACK_MAX, ("bogus stack")); 109 for (i = 0; i < st->depth; i++) { 110 stack_symbol(st->pcs[i], &name, &offset); 111 sbuf_printf(sb, "#%d %p at %s+%#lx\n", i, (void *)st->pcs[i], 112 name, offset); 113 } 114 } 115 116 #ifdef KTR 117 void 118 stack_ktr(u_int mask, const char *file, int line, struct stack *st, u_int depth, 119 int cheap) 120 { 121 const char *name; 122 long offset; 123 int i; 124 125 KASSERT(st->depth <= STACK_MAX, ("bogus stack")); 126 if (cheap) { 127 ktr_tracepoint(mask, file, line, "#0 %p %p %p %p %p %p", 128 st->pcs[0], st->pcs[1], st->pcs[2], st->pcs[3], 129 st->pcs[4], st->pcs[5]); 130 if (st->depth <= 6) 131 return; 132 ktr_tracepoint(mask, file, line, "#1 %p %p %p %p %p %p", 133 st->pcs[6], st->pcs[7], st->pcs[8], st->pcs[9], 134 st->pcs[10], st->pcs[11]); 135 if (st->depth <= 12) 136 return; 137 ktr_tracepoint(mask, file, line, "#2 %p %p %p %p %p %p", 138 st->pcs[12], st->pcs[13], st->pcs[14], st->pcs[15], 139 st->pcs[16], st->pcs[17]); 140 } else { 141 if (depth == 0 || st->depth < depth) 142 depth = st->depth; 143 for (i = 0; i < depth; i++) { 144 stack_symbol(st->pcs[i], &name, &offset); 145 ktr_tracepoint(mask, file, line, "#%d %p at %s+%#lx", 146 i, st->pcs[i], (u_long)name, offset, 0, 0); 147 } 148 } 149 } 150 #endif 151 152 static void 153 stack_symbol(vm_offset_t pc, const char **name, long *offset) 154 { 155 linker_symval_t symval; 156 c_linker_sym_t sym; 157 158 if (linker_ddb_search_symbol((caddr_t)pc, &sym, offset) != 0) 159 goto out; 160 if (linker_ddb_symbol_values(sym, &symval) != 0) 161 goto out; 162 if (symval.name != NULL) { 163 *name = symval.name; 164 return; 165 } 166 out: 167 *offset = 0; 168 *name = "Unknown func"; 169 } 170