Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/ddb/db_examine.c
Version:
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1 /* 2 * Mach Operating System 3 * Copyright (c) 1991,1990 Carnegie Mellon University 4 * All Rights Reserved. 5 * 6 * Permission to use, copy, modify and distribute this software and its 7 * documentation is hereby granted, provided that both the copyright 8 * notice and this permission notice appear in all copies of the 9 * software, derivative works or modified versions, and any portions 10 * thereof, and that both notices appear in supporting documentation. 11 * 12 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS 13 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 14 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 15 * 16 * Carnegie Mellon requests users of this software to return to 17 * 18 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 19 * School of Computer Science 20 * Carnegie Mellon University 21 * Pittsburgh PA 15213-3890 22 * 23 * any improvements or extensions that they make and grant Carnegie the 24 * rights to redistribute these changes. 25 * 26 * $FreeBSD$ 27 */ 28 29 /* 30 * Author: David B. Golub, Carnegie Mellon University 31 * Date: 7/90 32 */ 33 #include <sys/param.h> 34 35 #include <ddb/ddb.h> 36 37 #include <ddb/db_lex.h> 38 #include <ddb/db_output.h> 39 #include <ddb/db_command.h> 40 #include <ddb/db_sym.h> 41 #include <ddb/db_access.h> 42 43 static char db_examine_format[TOK_STRING_SIZE] = "x"; 44 45 static void db_examine __P((db_addr_t, char *, int)); 46 static void db_search __P((db_addr_t, int, db_expr_t, db_expr_t, u_int)); 47 48 /* 49 * Examine (print) data. 50 */ 51 /*ARGSUSED*/ 52 void 53 db_examine_cmd(addr, have_addr, count, modif) 54 db_expr_t addr; 55 boolean_t have_addr; 56 db_expr_t count; 57 char * modif; 58 { 59 if (modif[0] != '\0') 60 db_strcpy(db_examine_format, modif); 61 62 if (count == -1) 63 count = 1; 64 65 db_examine((db_addr_t) addr, db_examine_format, count); 66 } 67 68 static void 69 db_examine(addr, fmt, count) 70 register 71 db_addr_t addr; 72 char * fmt; /* format string */ 73 int count; /* repeat count */ 74 { 75 int c; 76 db_expr_t value; 77 int size; 78 int width; 79 char * fp; 80 81 while (--count >= 0) { 82 fp = fmt; 83 size = 4; 84 width = 16; 85 while ((c = *fp++) != 0) { 86 switch (c) { 87 case 'b': 88 size = 1; 89 width = 4; 90 break; 91 case 'h': 92 size = 2; 93 width = 8; 94 break; 95 case 'l': 96 size = 4; 97 width = 16; 98 break; 99 case 'g': 100 size = 8; 101 width = 32; 102 break; 103 case 'a': /* address */ 104 /* always forces a new line */ 105 if (db_print_position() != 0) 106 db_printf("\n"); 107 db_prev = addr; 108 db_printsym(addr, DB_STGY_ANY); 109 db_printf(":\t"); 110 break; 111 default: 112 if (db_print_position() == 0) { 113 /* Print the address. */ 114 db_printsym(addr, DB_STGY_ANY); 115 db_printf(":\t"); 116 db_prev = addr; 117 } 118 119 switch (c) { 120 case 'r': /* signed, current radix */ 121 value = db_get_value(addr, size, TRUE); 122 addr += size; 123 db_printf("%+-*r", width, value); 124 break; 125 case 'x': /* unsigned hex */ 126 value = db_get_value(addr, size, FALSE); 127 addr += size; 128 db_printf("%-*x", width, value); 129 break; 130 case 'z': /* signed hex */ 131 value = db_get_value(addr, size, TRUE); 132 addr += size; 133 db_printf("%-*z", width, value); 134 break; 135 case 'd': /* signed decimal */ 136 value = db_get_value(addr, size, TRUE); 137 addr += size; 138 db_printf("%-*d", width, value); 139 break; 140 case 'u': /* unsigned decimal */ 141 value = db_get_value(addr, size, FALSE); 142 addr += size; 143 db_printf("%-*u", width, value); 144 break; 145 case 'o': /* unsigned octal */ 146 value = db_get_value(addr, size, FALSE); 147 addr += size; 148 db_printf("%-*o", width, value); 149 break; 150 case 'c': /* character */ 151 value = db_get_value(addr, 1, FALSE); 152 addr += 1; 153 if (value >= ' ' && value <= '~') 154 db_printf("%c", value); 155 else 156 db_printf("\\%03o", value); 157 break; 158 case 's': /* null-terminated string */ 159 for (;;) { 160 value = db_get_value(addr, 1, FALSE); 161 addr += 1; 162 if (value == 0) 163 break; 164 if (value >= ' ' && value <= '~') 165 db_printf("%c", value); 166 else 167 db_printf("\\%03o", value); 168 } 169 break; 170 case 'i': /* instruction */ 171 addr = db_disasm(addr, FALSE); 172 break; 173 case 'I': /* instruction, alternate form */ 174 addr = db_disasm(addr, TRUE); 175 break; 176 default: 177 break; 178 } 179 if (db_print_position() != 0) 180 db_end_line(); 181 break; 182 } 183 } 184 } 185 db_next = addr; 186 } 187 188 /* 189 * Print value. 190 */ 191 static char db_print_format = 'x'; 192 193 /*ARGSUSED*/ 194 void 195 db_print_cmd(addr, have_addr, count, modif) 196 db_expr_t addr; 197 boolean_t have_addr; 198 db_expr_t count; 199 char * modif; 200 { 201 db_expr_t value; 202 203 if (modif[0] != '\0') 204 db_print_format = modif[0]; 205 206 switch (db_print_format) { 207 case 'a': 208 db_printsym((db_addr_t)addr, DB_STGY_ANY); 209 break; 210 case 'r': 211 db_printf("%+11lr", (long)addr); 212 break; 213 case 'x': 214 db_printf("%8lx", (unsigned long)addr); 215 break; 216 case 'z': 217 db_printf("%8lz", (long)addr); 218 break; 219 case 'd': 220 db_printf("%11ld", (long)addr); 221 break; 222 case 'u': 223 db_printf("%11lu", (unsigned long)addr); 224 break; 225 case 'o': 226 db_printf("%16lo", (unsigned long)addr); 227 break; 228 case 'c': 229 value = addr & 0xFF; 230 if (value >= ' ' && value <= '~') 231 db_printf("%c", value); 232 else 233 db_printf("\\%03o", value); 234 break; 235 } 236 db_printf("\n"); 237 } 238 239 void 240 db_print_loc_and_inst(loc) 241 db_addr_t loc; 242 { 243 db_printsym(loc, DB_STGY_PROC); 244 db_printf(":\t"); 245 (void) db_disasm(loc, TRUE); 246 } 247 248 /* 249 * Search for a value in memory. 250 * Syntax: search [/bhl] addr value [mask] [,count] 251 */ 252 void 253 db_search_cmd(dummy1, dummy2, dummy3, dummy4) 254 db_expr_t dummy1; 255 boolean_t dummy2; 256 db_expr_t dummy3; 257 char * dummy4; 258 { 259 int t; 260 db_addr_t addr; 261 int size; 262 db_expr_t value; 263 db_expr_t mask; 264 db_expr_t count; 265 266 t = db_read_token(); 267 if (t == tSLASH) { 268 t = db_read_token(); 269 if (t != tIDENT) { 270 bad_modifier: 271 db_printf("Bad modifier\n"); 272 db_flush_lex(); 273 return; 274 } 275 276 if (!strcmp(db_tok_string, "b")) 277 size = 1; 278 else if (!strcmp(db_tok_string, "h")) 279 size = 2; 280 else if (!strcmp(db_tok_string, "l")) 281 size = 4; 282 else 283 goto bad_modifier; 284 } else { 285 db_unread_token(t); 286 size = 4; 287 } 288 289 if (!db_expression((db_expr_t *)&addr)) { 290 db_printf("Address missing\n"); 291 db_flush_lex(); 292 return; 293 } 294 295 if (!db_expression(&value)) { 296 db_printf("Value missing\n"); 297 db_flush_lex(); 298 return; 299 } 300 301 if (!db_expression(&mask)) 302 mask = 0xffffffffUL; 303 304 t = db_read_token(); 305 if (t == tCOMMA) { 306 if (!db_expression(&count)) { 307 db_printf("Count missing\n"); 308 db_flush_lex(); 309 return; 310 } 311 } else { 312 db_unread_token(t); 313 count = -1; /* effectively forever */ 314 } 315 db_skip_to_eol(); 316 317 db_search(addr, size, value, mask, count); 318 } 319 320 static void 321 db_search(addr, size, value, mask, count) 322 register 323 db_addr_t addr; 324 int size; 325 db_expr_t value; 326 db_expr_t mask; 327 unsigned int count; 328 { 329 while (count-- != 0) { 330 db_prev = addr; 331 if ((db_get_value(addr, size, FALSE) & mask) == value) 332 break; 333 addr += size; 334 } 335 db_next = addr; 336 }
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