db_examine.c revision 1.21
1 /* $NetBSD: db_examine.c,v 1.21 2001/02/24 00:00:12 cgd 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/systm.h> 34 #include <sys/proc.h> 35 36 #include <machine/db_machdep.h> /* type definitions */ 37 38 #include <ddb/db_lex.h> 39 #include <ddb/db_output.h> 40 #include <ddb/db_command.h> 41 #include <ddb/db_sym.h> 42 #include <ddb/db_access.h> 43 #include <ddb/db_extern.h> 44 #include <ddb/db_interface.h> 45 46 char db_examine_format[TOK_STRING_SIZE] = "x"; 47 48 /* 49 * Examine (print) data. Syntax is: 50 * x/[bhl][cdiorsuxz]* 51 * For example, the command: 52 * x/bxxxx 53 * should print: 54 * address: 01 23 45 67 55 */ 56 /*ARGSUSED*/ 57 void 58 db_examine_cmd(addr, have_addr, count, modif) 59 db_expr_t addr; 60 int have_addr; 61 db_expr_t count; 62 char * modif; 63 { 64 if (modif[0] != '\0') 65 db_strcpy(db_examine_format, modif); 66 67 if (count == -1) 68 count = 1; 69 70 db_examine((db_addr_t) addr, db_examine_format, count); 71 } 72 73 void 74 db_examine(addr, fmt, count) 75 db_addr_t addr; 76 char * fmt; /* format string */ 77 int count; /* repeat count */ 78 { 79 int i, c; 80 db_expr_t value; 81 int size; 82 int width; 83 int bytes; 84 char * fp; 85 char tbuf[24]; 86 87 while (--count >= 0) { 88 fp = fmt; 89 size = 4; 90 width = 12; 91 while ((c = *fp++) != 0) { 92 if (db_print_position() == 0) { 93 /* Always print the address. */ 94 db_printsym(addr, DB_STGY_ANY, db_printf); 95 db_printf(":\t"); 96 db_prev = addr; 97 } 98 switch (c) { 99 case 'b': /* byte */ 100 size = 1; 101 width = 4; 102 break; 103 case 'h': /* half-word */ 104 size = 2; 105 width = 8; 106 break; 107 case 'l': /* long-word */ 108 size = 4; 109 width = 12; 110 break; 111 case 'L': /* implementation maximum */ 112 size = sizeof value; 113 width = 12 * (sizeof value / 4); 114 break; 115 case 'a': /* address */ 116 db_printf("= 0x%lx\n", addr); 117 break; 118 case 'r': /* signed, current radix */ 119 value = db_get_value(addr, size, TRUE); 120 addr += size; 121 db_format_radix(tbuf, 24, value, FALSE); 122 db_printf("%-*s", width, tbuf); 123 break; 124 case 'x': /* unsigned hex */ 125 value = db_get_value(addr, size, FALSE); 126 addr += size; 127 db_printf("%-*lx", width, value); 128 break; 129 case 'm': /* hex dump */ 130 /* 131 * Print off in chunks of size. Try to print 16 132 * bytes at a time into 4 columns. This 133 * loops modify's count extra times in order 134 * to get the nicely formatted lines. 135 */ 136 137 bytes = 0; 138 do { 139 for (i = 0; i < size; i++) { 140 value = 141 db_get_value(addr+bytes, 1, 142 FALSE); 143 db_printf("%02lx", value); 144 bytes++; 145 if (!(bytes % 4)) 146 db_printf(" "); 147 } 148 } while ((bytes != 16) && count--); 149 /* True up the columns before continuing */ 150 for (i = 4; i >= (bytes / 4); i--) 151 db_printf ("\t"); 152 /* Print chars, use . for non-printable's. */ 153 while (bytes--) { 154 value = db_get_value(addr, 1, FALSE); 155 addr += 1; 156 if (value >= ' ' && value <= '~') 157 db_printf("%c", (char)value); 158 else 159 db_printf("."); 160 } 161 db_printf("\n"); 162 break; 163 case 'z': /* signed hex */ 164 value = db_get_value(addr, size, TRUE); 165 addr += size; 166 db_format_hex(tbuf, 24, value, FALSE); 167 db_printf("%-*s", width, tbuf); 168 break; 169 case 'd': /* signed decimal */ 170 value = db_get_value(addr, size, TRUE); 171 addr += size; 172 db_printf("%-*ld", width, value); 173 break; 174 case 'u': /* unsigned decimal */ 175 value = db_get_value(addr, size, FALSE); 176 addr += size; 177 db_printf("%-*lu", width, value); 178 break; 179 case 'o': /* unsigned octal */ 180 value = db_get_value(addr, size, FALSE); 181 addr += size; 182 db_printf("%-*lo", width, value); 183 break; 184 case 'c': /* character */ 185 value = db_get_value(addr, 1, FALSE); 186 addr += 1; 187 if (value >= ' ' && value <= '~') 188 db_printf("%c", (char)value); 189 else 190 db_printf("\\%03lo", value); 191 break; 192 case 's': /* null-terminated string */ 193 for (;;) { 194 value = db_get_value(addr, 1, FALSE); 195 addr += 1; 196 if (value == 0) 197 break; 198 if (value >= ' ' && value <= '~') 199 db_printf("%c", (char)value); 200 else 201 db_printf("\\%03lo", value); 202 } 203 break; 204 case 'i': /* instruction */ 205 addr = db_disasm(addr, FALSE); 206 break; 207 case 'I': /* instruction, alternate form */ 208 addr = db_disasm(addr, TRUE); 209 break; 210 default: 211 break; 212 } 213 if (db_print_position() != 0) 214 db_end_line(); 215 } 216 } 217 db_next = addr; 218 } 219 220 /* 221 * Print value. 222 */ 223 char db_print_format = 'x'; 224 225 /*ARGSUSED*/ 226 void 227 db_print_cmd(addr, have_addr, count, modif) 228 db_expr_t addr; 229 int have_addr; 230 db_expr_t count; 231 char * modif; 232 { 233 db_expr_t value; 234 235 if (modif[0] != '\0') 236 db_print_format = modif[0]; 237 238 switch (db_print_format) { 239 case 'a': 240 db_printsym((db_addr_t)addr, DB_STGY_ANY, db_printf); 241 break; 242 case 'r': 243 { 244 char tbuf[24]; 245 246 db_format_radix(tbuf, 24, addr, FALSE); 247 db_printf("%11s", tbuf); 248 break; 249 } 250 case 'x': 251 db_printf("%8lx", addr); 252 break; 253 case 'z': 254 { 255 char tbuf[24]; 256 257 db_format_hex(tbuf, 24, addr, FALSE); 258 db_printf("%8s", tbuf); 259 break; 260 } 261 case 'd': 262 db_printf("%11ld", addr); 263 break; 264 case 'u': 265 db_printf("%11lu", addr); 266 break; 267 case 'o': 268 db_printf("%16lo", addr); 269 break; 270 case 'c': 271 value = addr & 0xFF; 272 if (value >= ' ' && value <= '~') 273 db_printf("%c", (char)value); 274 else 275 db_printf("\\%03lo", value); 276 break; 277 } 278 db_printf("\n"); 279 } 280 281 void 282 db_print_loc_and_inst(loc) 283 db_addr_t loc; 284 { 285 db_printsym(loc, DB_STGY_PROC, db_printf); 286 db_printf(":\t"); 287 (void) db_disasm(loc, FALSE); 288 } 289 290 void 291 db_strcpy(dst, src) 292 char *dst; 293 char *src; 294 { 295 while ((*dst++ = *src++) != '\0') 296 ; 297 } 298 299 /* 300 * Search for a value in memory. 301 * Syntax: search [/bhl] addr value [mask] [,count] 302 */ 303 /*ARGSUSED*/ 304 void 305 db_search_cmd(daddr, have_addr, dcount, modif) 306 db_expr_t daddr; 307 int have_addr; 308 db_expr_t dcount; 309 char * modif; 310 { 311 int t; 312 db_addr_t addr; 313 int size; 314 db_expr_t value; 315 db_expr_t mask; 316 db_expr_t count; 317 318 t = db_read_token(); 319 if (t == tSLASH) { 320 t = db_read_token(); 321 if (t != tIDENT) { 322 bad_modifier: 323 db_printf("Bad modifier\n"); 324 db_flush_lex(); 325 return; 326 } 327 328 if (!strcmp(db_tok_string, "b")) 329 size = 1; 330 else if (!strcmp(db_tok_string, "h")) 331 size = 2; 332 else if (!strcmp(db_tok_string, "l")) 333 size = 4; 334 else 335 goto bad_modifier; 336 } else { 337 db_unread_token(t); 338 size = 4; 339 } 340 341 if (!db_expression(&value)) { 342 db_printf("Address missing\n"); 343 db_flush_lex(); 344 return; 345 } 346 addr = (db_addr_t) value; 347 348 if (!db_expression(&value)) { 349 db_printf("Value missing\n"); 350 db_flush_lex(); 351 return; 352 } 353 354 if (!db_expression(&mask)) 355 mask = (int) ~0; 356 357 t = db_read_token(); 358 if (t == tCOMMA) { 359 if (!db_expression(&count)) { 360 db_printf("Count missing\n"); 361 db_flush_lex(); 362 return; 363 } 364 } else { 365 db_unread_token(t); 366 count = -1; /* effectively forever */ 367 } 368 db_skip_to_eol(); 369 370 db_search(addr, size, value, mask, count); 371 } 372 373 void 374 db_search(addr, size, value, mask, count) 375 db_addr_t addr; 376 int size; 377 db_expr_t value; 378 db_expr_t mask; 379 unsigned int count; 380 { 381 while (count-- != 0) { 382 db_prev = addr; 383 if ((db_get_value(addr, size, FALSE) & mask) == value) 384 break; 385 addr += size; 386 } 387 db_next = addr; 388 } 389
Indexes created Wed Sep 24 15:09:51 GMT 2025