db_examine.c revision 1.20
1 /* $NetBSD: db_examine.c,v 1.20 2000/12/28 07:30:06 jmc 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/param.h> 33 #include <sys/proc.h> 34 35 #include <machine/db_machdep.h> /* type definitions */ 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 #include <ddb/db_extern.h> 43 #include <ddb/db_interface.h> 44 45 char db_examine_format[TOK_STRING_SIZE] = "x"; 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(addr, have_addr, count, modif) 58 db_expr_t addr; 59 int have_addr; 60 db_expr_t count; 61 char * modif; 62 { 63 if (modif[0] != '\0') 64 db_strcpy(db_examine_format, modif); 65 66 if (count == -1) 67 count = 1; 68 69 db_examine((db_addr_t) addr, db_examine_format, count); 70 } 71 72 void 73 db_examine(addr, fmt, count) 74 db_addr_t addr; 75 char * fmt; /* format string */ 76 int count; /* repeat count */ 77 { 78 int i, c; 79 db_expr_t value; 80 int size; 81 int width; 82 int bytes; 83 char * fp; 84 char tbuf[24]; 85 86 while (--count >= 0) { 87 fp = fmt; 88 size = 4; 89 width = 12; 90 while ((c = *fp++) != 0) { 91 if (db_print_position() == 0) { 92 /* Always print the address. */ 93 db_printsym(addr, DB_STGY_ANY, db_printf); 94 db_printf(":\t"); 95 db_prev = addr; 96 } 97 switch (c) { 98 case 'b': /* byte */ 99 size = 1; 100 width = 4; 101 break; 102 case 'h': /* half-word */ 103 size = 2; 104 width = 8; 105 break; 106 case 'l': /* long-word */ 107 size = 4; 108 width = 12; 109 break; 110 case 'L': /* implementation maximum */ 111 size = sizeof value; 112 width = 12 * (sizeof value / 4); 113 break; 114 case 'a': /* address */ 115 db_printf("= 0x%lx\n", addr); 116 break; 117 case 'r': /* signed, current radix */ 118 value = db_get_value(addr, size, TRUE); 119 addr += size; 120 db_format_radix(tbuf, 24, value, FALSE); 121 db_printf("%-*s", width, tbuf); 122 break; 123 case 'x': /* unsigned hex */ 124 value = db_get_value(addr, size, FALSE); 125 addr += size; 126 db_printf("%-*lx", width, value); 127 break; 128 case 'm': /* hex dump */ 129 /* 130 * Print off in chunks of size. Try to print 16 131 * bytes at a time into 4 columns. This 132 * loops modify's count extra times in order 133 * to get the nicely formatted lines. 134 */ 135 136 bytes = 0; 137 do { 138 for (i = 0; i < size; i++) { 139 value = 140 db_get_value(addr+bytes, 1, 141 FALSE); 142 db_printf("%02lx", value); 143 bytes++; 144 if (!(bytes % 4)) 145 db_printf(" "); 146 } 147 } while ((bytes != 16) && count--); 148 /* True up the columns before continuing */ 149 for (i = 4; i >= (bytes / 4); i--) 150 db_printf ("\t"); 151 /* Print chars, use . for non-printable's. */ 152 while (bytes--) { 153 value = db_get_value(addr, 1, FALSE); 154 addr += 1; 155 if (value >= ' ' && value <= '~') 156 db_printf("%c", (char)value); 157 else 158 db_printf("."); 159 } 160 db_printf("\n"); 161 break; 162 case 'z': /* signed hex */ 163 value = db_get_value(addr, size, TRUE); 164 addr += size; 165 db_format_hex(tbuf, 24, value, FALSE); 166 db_printf("%-*s", width, tbuf); 167 break; 168 case 'd': /* signed decimal */ 169 value = db_get_value(addr, size, TRUE); 170 addr += size; 171 db_printf("%-*ld", width, value); 172 break; 173 case 'u': /* unsigned decimal */ 174 value = db_get_value(addr, size, FALSE); 175 addr += size; 176 db_printf("%-*lu", width, value); 177 break; 178 case 'o': /* unsigned octal */ 179 value = db_get_value(addr, size, FALSE); 180 addr += size; 181 db_printf("%-*lo", 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("\\%03lo", 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("\\%03lo", 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 char db_print_format = 'x'; 223 224 /*ARGSUSED*/ 225 void 226 db_print_cmd(addr, have_addr, count, modif) 227 db_expr_t addr; 228 int have_addr; 229 db_expr_t count; 230 char * modif; 231 { 232 db_expr_t value; 233 234 if (modif[0] != '\0') 235 db_print_format = modif[0]; 236 237 switch (db_print_format) { 238 case 'a': 239 db_printsym((db_addr_t)addr, DB_STGY_ANY, db_printf); 240 break; 241 case 'r': 242 { 243 char tbuf[24]; 244 245 db_format_radix(tbuf, 24, addr, FALSE); 246 db_printf("%11s", tbuf); 247 break; 248 } 249 case 'x': 250 db_printf("%8lx", addr); 251 break; 252 case 'z': 253 { 254 char tbuf[24]; 255 256 db_format_hex(tbuf, 24, addr, FALSE); 257 db_printf("%8s", tbuf); 258 break; 259 } 260 case 'd': 261 db_printf("%11ld", addr); 262 break; 263 case 'u': 264 db_printf("%11lu", addr); 265 break; 266 case 'o': 267 db_printf("%16lo", addr); 268 break; 269 case 'c': 270 value = addr & 0xFF; 271 if (value >= ' ' && value <= '~') 272 db_printf("%c", (char)value); 273 else 274 db_printf("\\%03lo", value); 275 break; 276 } 277 db_printf("\n"); 278 } 279 280 void 281 db_print_loc_and_inst(loc) 282 db_addr_t loc; 283 { 284 db_printsym(loc, DB_STGY_PROC, db_printf); 285 db_printf(":\t"); 286 (void) db_disasm(loc, FALSE); 287 } 288 289 void 290 db_strcpy(dst, src) 291 char *dst; 292 char *src; 293 { 294 while ((*dst++ = *src++) != '\0') 295 ; 296 } 297 298 /* 299 * Search for a value in memory. 300 * Syntax: search [/bhl] addr value [mask] [,count] 301 */ 302 /*ARGSUSED*/ 303 void 304 db_search_cmd(daddr, have_addr, dcount, modif) 305 db_expr_t daddr; 306 int have_addr; 307 db_expr_t dcount; 308 char * modif; 309 { 310 int t; 311 db_addr_t addr; 312 int size; 313 db_expr_t value; 314 db_expr_t mask; 315 db_expr_t count; 316 317 t = db_read_token(); 318 if (t == tSLASH) { 319 t = db_read_token(); 320 if (t != tIDENT) { 321 bad_modifier: 322 db_printf("Bad modifier\n"); 323 db_flush_lex(); 324 return; 325 } 326 327 if (!strcmp(db_tok_string, "b")) 328 size = 1; 329 else if (!strcmp(db_tok_string, "h")) 330 size = 2; 331 else if (!strcmp(db_tok_string, "l")) 332 size = 4; 333 else 334 goto bad_modifier; 335 } else { 336 db_unread_token(t); 337 size = 4; 338 } 339 340 if (!db_expression(&value)) { 341 db_printf("Address missing\n"); 342 db_flush_lex(); 343 return; 344 } 345 addr = (db_addr_t) value; 346 347 if (!db_expression(&value)) { 348 db_printf("Value missing\n"); 349 db_flush_lex(); 350 return; 351 } 352 353 if (!db_expression(&mask)) 354 mask = (int) ~0; 355 356 t = db_read_token(); 357 if (t == tCOMMA) { 358 if (!db_expression(&count)) { 359 db_printf("Count missing\n"); 360 db_flush_lex(); 361 return; 362 } 363 } else { 364 db_unread_token(t); 365 count = -1; /* effectively forever */ 366 } 367 db_skip_to_eol(); 368 369 db_search(addr, size, value, mask, count); 370 } 371 372 void 373 db_search(addr, size, value, mask, count) 374 db_addr_t addr; 375 int size; 376 db_expr_t value; 377 db_expr_t mask; 378 unsigned int count; 379 { 380 while (count-- != 0) { 381 db_prev = addr; 382 if ((db_get_value(addr, size, FALSE) & mask) == value) 383 break; 384 addr += size; 385 } 386 db_next = addr; 387 } 388
Indexes created Wed Sep 24 05:09:52 GMT 2025