1 /* $NetBSD: db_examine.c,v 1.35 2011/05/26 15:34:14 joerg 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@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 1.35 2011/05/26 15:34:14 joerg 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("%-*" DDB_EXPR_FMT "x", width, value); 121 break; 122 case 'm': /* hex dump */ 123 /* 124 * Print off in chunks of size. Try to print 16 125 * bytes at a time into 4 columns. This 126 * loops modify's count extra times in order 127 * to get the nicely formatted lines. 128 */ 129 130 bytes = 0; 131 do { 132 for (i = 0; i < size; i++) { 133 value = 134 db_get_value(addr+bytes, 1, 135 false); 136 db_printf( 137 "%02" DDB_EXPR_FMT "x", 138 value); 139 bytes++; 140 if (!(bytes % 4)) 141 db_printf(" "); 142 } 143 } while ((bytes != 16) && count--); 144 /* True up the columns before continuing */ 145 for (i = 4; i >= (bytes / 4); i--) 146 db_printf ("\t"); 147 /* Print chars, use . for non-printable's. */ 148 while (bytes--) { 149 value = db_get_value(addr, 1, false); 150 addr += 1; 151 if (value >= ' ' && value <= '~') 152 db_printf("%c", (char)value); 153 else 154 db_printf("."); 155 } 156 db_printf("\n"); 157 break; 158 case 'z': /* signed hex */ 159 value = db_get_value(addr, size, true); 160 addr += size; 161 db_format_hex(tbuf, 24, value, false); 162 db_printf("%-*s", width, tbuf); 163 break; 164 case 'd': /* signed decimal */ 165 value = db_get_value(addr, size, true); 166 addr += size; 167 db_printf("%-*" DDB_EXPR_FMT "d", width, value); 168 break; 169 case 'u': /* unsigned decimal */ 170 value = db_get_value(addr, size, false); 171 addr += size; 172 db_printf("%-*" DDB_EXPR_FMT "u", width, value); 173 break; 174 case 'o': /* unsigned octal */ 175 value = db_get_value(addr, size, false); 176 addr += size; 177 db_printf("%-*" DDB_EXPR_FMT "o", width, value); 178 break; 179 case 'c': /* character */ 180 value = db_get_value(addr, 1, false); 181 addr += 1; 182 if (value >= ' ' && value <= '~') 183 db_printf("%c", (char)value); 184 else 185 db_printf("\\%03o", (int)value); 186 break; 187 case 's': /* null-terminated string */ 188 for (;;) { 189 value = db_get_value(addr, 1, false); 190 addr += 1; 191 if (value == 0) 192 break; 193 if (value >= ' ' && value <= '~') 194 db_printf("%c", (char)value); 195 else 196 db_printf("\\%03o", (int)value); 197 } 198 break; 199 case 'i': /* instruction */ 200 addr = db_disasm(addr, false); 201 break; 202 case 'I': /* instruction, alternate form */ 203 addr = db_disasm(addr, true); 204 break; 205 default: 206 break; 207 } 208 if (db_print_position() != 0) 209 db_end_line(); 210 } 211 } 212 db_next = addr; 213 } 214 215 /* 216 * Print value. 217 */ 218 static char db_print_format = 'x'; 219 220 /*ARGSUSED*/ 221 void 222 db_print_cmd(db_expr_t addr, bool have_addr, db_expr_t count, 223 const char *modif) 224 { 225 db_expr_t value; 226 227 if (modif[0] != '\0') 228 db_print_format = modif[0]; 229 230 switch (db_print_format) { 231 case 'a': 232 db_printsym((db_addr_t)addr, DB_STGY_ANY, db_printf); 233 break; 234 case 'r': 235 { 236 char tbuf[24]; 237 238 db_format_radix(tbuf, 24, addr, false); 239 db_printf("%11s", tbuf); 240 break; 241 } 242 case 'x': 243 db_printf("%16" DDB_EXPR_FMT "x", addr); 244 break; 245 case 'z': 246 { 247 char tbuf[24]; 248 249 db_format_hex(tbuf, 24, addr, false); 250 db_printf("%8s", tbuf); 251 break; 252 } 253 case 'd': 254 db_printf("%11" DDB_EXPR_FMT "d", addr); 255 break; 256 case 'u': 257 db_printf("%11" DDB_EXPR_FMT "u", addr); 258 break; 259 case 'o': 260 db_printf("%15" DDB_EXPR_FMT "o", addr); 261 break; 262 case 'c': 263 value = addr & 0xFF; 264 if (value >= ' ' && value <= '~') 265 db_printf("%c", (char)value); 266 else 267 db_printf("\\%03o", (int)value); 268 break; 269 } 270 db_printf("\n"); 271 } 272 273 void 274 db_print_loc_and_inst(db_addr_t loc) 275 { 276 277 db_printsym(loc, DB_STGY_PROC, db_printf); 278 db_printf(":\t"); 279 (void) db_disasm(loc, false); 280 } 281 282 /* 283 * Search for a value in memory. 284 * Syntax: search [/bhl] addr value [mask] [,count] 285 */ 286 /*ARGSUSED*/ 287 void 288 db_search_cmd(db_expr_t daddr, bool have_addr, 289 db_expr_t dcount, const char *modif) 290 { 291 int t; 292 db_addr_t addr; 293 int size; 294 db_expr_t value; 295 db_expr_t mask; 296 db_expr_t count; 297 298 t = db_read_token(); 299 if (t == tSLASH) { 300 t = db_read_token(); 301 if (t != tIDENT) { 302 bad_modifier: 303 db_printf("Bad modifier\n"); 304 db_flush_lex(); 305 return; 306 } 307 308 if (!strcmp(db_tok_string, "b")) 309 size = 1; 310 else if (!strcmp(db_tok_string, "h")) 311 size = 2; 312 else if (!strcmp(db_tok_string, "l")) 313 size = 4; 314 else 315 goto bad_modifier; 316 } else { 317 db_unread_token(t); 318 size = 4; 319 } 320 321 if (!db_expression(&value)) { 322 db_printf("Address missing\n"); 323 db_flush_lex(); 324 return; 325 } 326 addr = (db_addr_t) value; 327 328 if (!db_expression(&value)) { 329 db_printf("Value missing\n"); 330 db_flush_lex(); 331 return; 332 } 333 334 if (!db_expression(&mask)) 335 mask = (int) ~0; 336 337 t = db_read_token(); 338 if (t == tCOMMA) { 339 if (!db_expression(&count)) { 340 db_printf("Count missing\n"); 341 db_flush_lex(); 342 return; 343 } 344 } else { 345 db_unread_token(t); 346 count = -1; /* effectively forever */ 347 } 348 db_skip_to_eol(); 349 350 db_search(addr, size, value, mask, count); 351 } 352 353 static void 354 db_search(db_addr_t addr, int size, db_expr_t value, db_expr_t mask, 355 unsigned int count) 356 { 357 while (count-- != 0) { 358 db_prev = addr; 359 if ((db_get_value(addr, size, false) & mask) == value) 360 break; 361 addr += size; 362 } 363 db_next = addr; 364 } 365