db_watch.c revision 1.6
1 /* $NetBSD: db_watch.c,v 1.6 1994/10/09 08:19:43 mycroft Exp $ */ 2 3 /* 4 * Mach Operating System 5 * Copyright (c) 1991,1990 Carnegie Mellon University 6 * All Rights Reserved. 7 * 8 * Permission to use, copy, modify and distribute this software and its 9 * documentation is hereby granted, provided that both the copyright 10 * notice and this permission notice appear in all copies of the 11 * software, derivative works or modified versions, and any portions 12 * thereof, and that both notices appear in supporting documentation. 13 * 14 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS 15 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 16 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 17 * 18 * Carnegie Mellon requests users of this software to return to 19 * 20 * Software Distribution Coordinator or Software.Distribution (at) CS.CMU.EDU 21 * School of Computer Science 22 * Carnegie Mellon University 23 * Pittsburgh PA 15213-3890 24 * 25 * any improvements or extensions that they make and grant Carnegie the 26 * rights to redistribute these changes. 27 * 28 * Author: Richard P. Draves, Carnegie Mellon University 29 * Date: 10/90 30 */ 31 32 #include <sys/param.h> 33 #include <sys/proc.h> 34 35 #include <ddb/db_watch.h> 36 #include <ddb/db_lex.h> 37 #include <ddb/db_access.h> 38 #include <ddb/db_sym.h> 39 40 /* 41 * Watchpoints. 42 */ 43 44 boolean_t db_watchpoints_inserted = TRUE; 45 46 #define NWATCHPOINTS 100 47 struct db_watchpoint db_watch_table[NWATCHPOINTS]; 48 db_watchpoint_t db_next_free_watchpoint = &db_watch_table[0]; 49 db_watchpoint_t db_free_watchpoints = 0; 50 db_watchpoint_t db_watchpoint_list = 0; 51 52 db_watchpoint_t 53 db_watchpoint_alloc() 54 { 55 register db_watchpoint_t watch; 56 57 if ((watch = db_free_watchpoints) != 0) { 58 db_free_watchpoints = watch->link; 59 return (watch); 60 } 61 if (db_next_free_watchpoint == &db_watch_table[NWATCHPOINTS]) { 62 db_printf("All watchpoints used.\n"); 63 return (0); 64 } 65 watch = db_next_free_watchpoint; 66 db_next_free_watchpoint++; 67 68 return (watch); 69 } 70 71 void 72 db_watchpoint_free(watch) 73 register db_watchpoint_t watch; 74 { 75 watch->link = db_free_watchpoints; 76 db_free_watchpoints = watch; 77 } 78 79 void 80 db_set_watchpoint(map, addr, size) 81 vm_map_t map; 82 db_addr_t addr; 83 vm_size_t size; 84 { 85 register db_watchpoint_t watch; 86 87 if (map == NULL) { 88 db_printf("No map.\n"); 89 return; 90 } 91 92 /* 93 * Should we do anything fancy with overlapping regions? 94 */ 95 96 for (watch = db_watchpoint_list; 97 watch != 0; 98 watch = watch->link) 99 if (db_map_equal(watch->map, map) && 100 (watch->loaddr == addr) && 101 (watch->hiaddr == addr+size)) { 102 db_printf("Already set.\n"); 103 return; 104 } 105 106 watch = db_watchpoint_alloc(); 107 if (watch == 0) { 108 db_printf("Too many watchpoints.\n"); 109 return; 110 } 111 112 watch->map = map; 113 watch->loaddr = addr; 114 watch->hiaddr = addr+size; 115 116 watch->link = db_watchpoint_list; 117 db_watchpoint_list = watch; 118 119 db_watchpoints_inserted = FALSE; 120 } 121 122 void 123 db_delete_watchpoint(map, addr) 124 vm_map_t map; 125 db_addr_t addr; 126 { 127 register db_watchpoint_t watch; 128 register db_watchpoint_t *prev; 129 130 for (prev = &db_watchpoint_list; 131 (watch = *prev) != 0; 132 prev = &watch->link) 133 if (db_map_equal(watch->map, map) && 134 (watch->loaddr <= addr) && 135 (addr < watch->hiaddr)) { 136 *prev = watch->link; 137 db_watchpoint_free(watch); 138 return; 139 } 140 141 db_printf("Not set.\n"); 142 } 143 144 void 145 db_list_watchpoints() 146 { 147 register db_watchpoint_t watch; 148 149 if (db_watchpoint_list == 0) { 150 db_printf("No watchpoints set\n"); 151 return; 152 } 153 154 db_printf(" Map Address Size\n"); 155 for (watch = db_watchpoint_list; 156 watch != 0; 157 watch = watch->link) 158 db_printf("%s%8x %8x %x\n", 159 db_map_current(watch->map) ? "*" : " ", 160 watch->map, watch->loaddr, 161 watch->hiaddr - watch->loaddr); 162 } 163 164 /* Delete watchpoint */ 165 /*ARGSUSED*/ 166 void 167 db_deletewatch_cmd(addr, have_addr, count, modif) 168 db_expr_t addr; 169 int have_addr; 170 db_expr_t count; 171 char * modif; 172 { 173 db_delete_watchpoint(db_map_addr(addr), addr); 174 } 175 176 /* Set watchpoint */ 177 /*ARGSUSED*/ 178 void 179 db_watchpoint_cmd(addr, have_addr, count, modif) 180 db_expr_t addr; 181 int have_addr; 182 db_expr_t count; 183 char * modif; 184 { 185 vm_size_t size; 186 db_expr_t value; 187 188 if (db_expression(&value)) 189 size = (vm_size_t) value; 190 else 191 size = 4; 192 db_skip_to_eol(); 193 194 db_set_watchpoint(db_map_addr(addr), addr, size); 195 } 196 197 /* list watchpoints */ 198 void 199 db_listwatch_cmd() 200 { 201 db_list_watchpoints(); 202 } 203 204 void 205 db_set_watchpoints() 206 { 207 register db_watchpoint_t watch; 208 209 if (!db_watchpoints_inserted) { 210 for (watch = db_watchpoint_list; 211 watch != 0; 212 watch = watch->link) 213 pmap_protect(watch->map->pmap, 214 trunc_page(watch->loaddr), 215 round_page(watch->hiaddr), 216 VM_PROT_READ); 217 218 db_watchpoints_inserted = TRUE; 219 } 220 } 221 222 void 223 db_clear_watchpoints() 224 { 225 db_watchpoints_inserted = FALSE; 226 } 227 228 boolean_t 229 db_find_watchpoint(map, addr, regs) 230 vm_map_t map; 231 db_addr_t addr; 232 db_regs_t *regs; 233 { 234 register db_watchpoint_t watch; 235 db_watchpoint_t found = 0; 236 237 for (watch = db_watchpoint_list; 238 watch != 0; 239 watch = watch->link) 240 if (db_map_equal(watch->map, map)) { 241 if ((watch->loaddr <= addr) && 242 (addr < watch->hiaddr)) 243 return (TRUE); 244 else if ((trunc_page(watch->loaddr) <= addr) && 245 (addr < round_page(watch->hiaddr))) 246 found = watch; 247 } 248 249 /* 250 * We didn't hit exactly on a watchpoint, but we are 251 * in a protected region. We want to single-step 252 * and then re-protect. 253 */ 254 255 if (found) { 256 db_watchpoints_inserted = FALSE; 257 db_single_step(regs); 258 } 259 260 return (FALSE); 261 } 262
Indexes created Wed Sep 24 15:09:51 GMT 2025