db_examine.c revision 1.34
1 /* $NetBSD: db_examine.c,v 1.34 2009/03/07 22:02:17 ad 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 "AS IS" 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: David B. Golub, Carnegie Mellon University 29 * Date: 7/90 30 */ 31 32 #include <sys/cdefs.h> 33 __KERNEL_RCSID(0, "$NetBSD: db_examine.c,v 1.34 2009/03/07 22:02:17 ad Exp $"); 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/buf.h> 38 #include <sys/proc.h> 39 40 #include <ddb/ddb.h> 41 42 static char db_examine_format[TOK_STRING_SIZE] = "x"; 43 44 static void db_examine(db_addr_t, char *, int); 45 static void db_search(db_addr_t, int, db_expr_t, db_expr_t, unsigned int); 46 47 /* 48 * Examine (print) data. Syntax is: 49 * x/[bhl][cdiorsuxz]* 50 * For example, the command: 51 * x/bxxxx 52 * should print: 53 * address: 01 23 45 67 54 */ 55 /*ARGSUSED*/ 56 void 57 db_examine_cmd(db_expr_t addr, bool have_addr, db_expr_t count, 58 const char *modif) 59 { 60 if (modif[0] != '\0') 61 strlcpy(db_examine_format, modif, sizeof(db_examine_format)); 62 63 if (count == -1) 64 count = 1; 65 66 db_examine((db_addr_t) addr, db_examine_format, count); 67 } 68 69 static void 70 db_examine(db_addr_t addr, char *fmt, int count) 71 { 72 int i, c; 73 db_expr_t value; 74 int size; 75 int width; 76 int bytes; 77 char * fp; 78 char tbuf[24]; 79 80 while (--count >= 0) { 81 fp = fmt; 82 size = 4; 83 width = 12; 84 while ((c = *fp++) != 0) { 85 if (db_print_position() == 0) { 86 /* Always print the address. */ 87 db_printsym(addr, DB_STGY_ANY, db_printf); 88 db_printf(":\t"); 89 db_prev = addr; 90 } 91 switch (c) { 92 case 'b': /* byte */ 93 size = 1; 94 width = 4; 95 break; 96 case 'h': /* half-word */ 97 size = 2; 98 width = 8; 99 break; 100 case 'l': /* long-word */ 101 size = 4; 102 width = 12; 103 break; 104 case 'L': /* implementation maximum */ 105 size = sizeof value; 106 width = 12 * (sizeof value / 4); 107 break; 108 case 'a': /* address */ 109 db_printf("= 0x%lx\n", (long)addr); 110 break; 111 case 'r': /* signed, current radix */ 112 value = db_get_value(addr, size, true); 113 addr += size; 114 db_format_radix(tbuf, 24, value, false); 115 db_printf("%-*s", width, tbuf); 116 break; 117 case 'x': /* unsigned hex */ 118 value = db_get_value(addr, size, false); 119 addr += size; 120 db_printf(DB_EXPR_T_IS_QUAD ? "%-*qx" : "%-*lx", 121 width, value); 122 break; 123 case 'm': /* hex dump */ 124 /* 125 * Print off in chunks of size. Try to print 16 126 * bytes at a time into 4 columns. This 127 * loops modify's count extra times in order 128 * to get the nicely formatted lines. 129 */ 130 131 bytes = 0; 132 do { 133 for (i = 0; i < size; i++) { 134 value = 135 db_get_value(addr+bytes, 1, 136 false); 137 db_printf( 138 DB_EXPR_T_IS_QUAD ? "%02qx": 139 "%02lx", value); 140 bytes++; 141 if (!(bytes % 4)) 142 db_printf(" "); 143 } 144 } while ((bytes != 16) && count--); 145 /* True up the columns before continuing */ 146 for (i = 4; i >= (bytes / 4); i--) 147 db_printf ("\t"); 148 /* Print chars, use . for non-printable's. */ 149 while (bytes--) { 150 value = db_get_value(addr, 1, false); 151 addr += 1; 152 if (value >= ' ' && value <= '~') 153 db_printf("%c", (char)value); 154 else 155 db_printf("."); 156 } 157 db_printf("\n"); 158 break; 159 case 'z': /* signed hex */ 160 value = db_get_value(addr, size, true); 161 addr += size; 162 db_format_hex(tbuf, 24, value, false); 163 db_printf("%-*s", width, tbuf); 164 break; 165 case 'd': /* signed decimal */ 166 value = db_get_value(addr, size, true); 167 addr += size; 168 db_printf(DB_EXPR_T_IS_QUAD ? "%-*qd" : "%-*ld", 169 width, value); 170 break; 171 case 'u': /* unsigned decimal */ 172 value = db_get_value(addr, size, false); 173 addr += size; 174 db_printf(DB_EXPR_T_IS_QUAD ? "%-*qu" : "%-*lu", 175 width, value); 176 break; 177 case 'o': /* unsigned octal */ 178 value = db_get_value(addr, size, false); 179 addr += size; 180 db_printf(DB_EXPR_T_IS_QUAD ? "%-*qo" : "%-*lo", 181 width, value); 182 break; 183 case 'c': /* character */ 184 value = db_get_value(addr, 1, false); 185 addr += 1; 186 if (value >= ' ' && value <= '~') 187 db_printf("%c", (char)value); 188 else 189 db_printf("\\%03o", (int)value); 190 break; 191 case 's': /* null-terminated string */ 192 for (;;) { 193 value = db_get_value(addr, 1, false); 194 addr += 1; 195 if (value == 0) 196 break; 197 if (value >= ' ' && value <= '~') 198 db_printf("%c", (char)value); 199 else 200 db_printf("\\%03o", (int)value); 201 } 202 break; 203 case 'i': /* instruction */ 204 addr = db_disasm(addr, false); 205 break; 206 case 'I': /* instruction, alternate form */ 207 addr = db_disasm(addr, true); 208 break; 209 default: 210 break; 211 } 212 if (db_print_position() != 0) 213 db_end_line(); 214 } 215 } 216 db_next = addr; 217 } 218 219 /* 220 * Print value. 221 */ 222 static char db_print_format = 'x'; 223 224 /*ARGSUSED*/ 225 void 226 db_print_cmd(db_expr_t addr, bool have_addr, db_expr_t count, 227 const char *modif) 228 { 229 db_expr_t value; 230 231 if (modif[0] != '\0') 232 db_print_format = modif[0]; 233 234 switch (db_print_format) { 235 case 'a': 236 db_printsym((db_addr_t)addr, DB_STGY_ANY, db_printf); 237 break; 238 case 'r': 239 { 240 char tbuf[24]; 241 242 db_format_radix(tbuf, 24, addr, false); 243 db_printf("%11s", tbuf); 244 break; 245 } 246 case 'x': 247 db_printf(DB_EXPR_T_IS_QUAD ? "%16qx" : "%8lx", addr); 248 break; 249 case 'z': 250 { 251 char tbuf[24]; 252 253 db_format_hex(tbuf, 24, addr, false); 254 db_printf("%8s", tbuf); 255 break; 256 } 257 case 'd': 258 db_printf(DB_EXPR_T_IS_QUAD ? "%11qd" : "%11ld", addr); 259 break; 260 case 'u': 261 db_printf(DB_EXPR_T_IS_QUAD ? "%11qu" : "%11lu", addr); 262 break; 263 case 'o': 264 db_printf(DB_EXPR_T_IS_QUAD ? "%15qo" : "%16lo", addr); 265 break; 266 case 'c': 267 value = addr & 0xFF; 268 if (value >= ' ' && value <= '~') 269 db_printf("%c", (char)value); 270 else 271 db_printf("\\%03o", (int)value); 272 break; 273 } 274 db_printf("\n"); 275 } 276 277 void 278 db_print_loc_and_inst(db_addr_t loc) 279 { 280 281 db_printsym(loc, DB_STGY_PROC, db_printf); 282 db_printf(":\t"); 283 (void) db_disasm(loc, false); 284 } 285 286 /* 287 * Search for a value in memory. 288 * Syntax: search [/bhl] addr value [mask] [,count] 289 */ 290 /*ARGSUSED*/ 291 void 292 db_search_cmd(db_expr_t daddr, bool have_addr, 293 db_expr_t dcount, const char *modif) 294 { 295 int t; 296 db_addr_t addr; 297 int size; 298 db_expr_t value; 299 db_expr_t mask; 300 db_expr_t count; 301 302 t = db_read_token(); 303 if (t == tSLASH) { 304 t = db_read_token(); 305 if (t != tIDENT) { 306 bad_modifier: 307 db_printf("Bad modifier\n"); 308 db_flush_lex(); 309 return; 310 } 311 312 if (!strcmp(db_tok_string, "b")) 313 size = 1; 314 else if (!strcmp(db_tok_string, "h")) 315 size = 2; 316 else if (!strcmp(db_tok_string, "l")) 317 size = 4; 318 else 319 goto bad_modifier; 320 } else { 321 db_unread_token(t); 322 size = 4; 323 } 324 325 if (!db_expression(&value)) { 326 db_printf("Address missing\n"); 327 db_flush_lex(); 328 return; 329 } 330 addr = (db_addr_t) value; 331 332 if (!db_expression(&value)) { 333 db_printf("Value missing\n"); 334 db_flush_lex(); 335 return; 336 } 337 338 if (!db_expression(&mask)) 339 mask = (int) ~0; 340 341 t = db_read_token(); 342 if (t == tCOMMA) { 343 if (!db_expression(&count)) { 344 db_printf("Count missing\n"); 345 db_flush_lex(); 346 return; 347 } 348 } else { 349 db_unread_token(t); 350 count = -1; /* effectively forever */ 351 } 352 db_skip_to_eol(); 353 354 db_search(addr, size, value, mask, count); 355 } 356 357 static void 358 db_search(db_addr_t addr, int size, db_expr_t value, db_expr_t mask, 359 unsigned int count) 360 { 361 while (count-- != 0) { 362 db_prev = addr; 363 if ((db_get_value(addr, size, false) & mask) == value) 364 break; 365 addr += size; 366 } 367 db_next = addr; 368 } 369
Indexes created Thu Sep 25 16:09:42 GMT 2025