db_examine.c revision 1.26
1 /* $NetBSD: db_examine.c,v 1.26 2003/11/09 20:52:18 scw 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 1.26 2003/11/09 20:52:18 scw Exp $"); 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/proc.h> 38 39 #include <machine/db_machdep.h> /* type definitions */ 40 41 #include <ddb/db_lex.h> 42 #include <ddb/db_output.h> 43 #include <ddb/db_command.h> 44 #include <ddb/db_sym.h> 45 #include <ddb/db_access.h> 46 #include <ddb/db_extern.h> 47 #include <ddb/db_interface.h> 48 49 static char db_examine_format[TOK_STRING_SIZE] = "x"; 50 51 static void db_examine(db_addr_t, char *, int); 52 static void db_search(db_addr_t, int, db_expr_t, db_expr_t, unsigned int); 53 54 /* 55 * Examine (print) data. Syntax is: 56 * x/[bhl][cdiorsuxz]* 57 * For example, the command: 58 * x/bxxxx 59 * should print: 60 * address: 01 23 45 67 61 */ 62 /*ARGSUSED*/ 63 void 64 db_examine_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif) 65 { 66 if (modif[0] != '\0') 67 strlcpy(db_examine_format, modif, sizeof(db_examine_format)); 68 69 if (count == -1) 70 count = 1; 71 72 db_examine((db_addr_t) addr, db_examine_format, count); 73 } 74 75 static void 76 db_examine(db_addr_t addr, char *fmt, int 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", (long)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(DB_EXPR_T_IS_QUAD ? "%-*qx" : "%-*lx", 127 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( 144 DB_EXPR_T_IS_QUAD ? "%02qx": 145 "%02lx", value); 146 bytes++; 147 if (!(bytes % 4)) 148 db_printf(" "); 149 } 150 } while ((bytes != 16) && count--); 151 /* True up the columns before continuing */ 152 for (i = 4; i >= (bytes / 4); i--) 153 db_printf ("\t"); 154 /* Print chars, use . for non-printable's. */ 155 while (bytes--) { 156 value = db_get_value(addr, 1, FALSE); 157 addr += 1; 158 if (value >= ' ' && value <= '~') 159 db_printf("%c", (char)value); 160 else 161 db_printf("."); 162 } 163 db_printf("\n"); 164 break; 165 case 'z': /* signed hex */ 166 value = db_get_value(addr, size, TRUE); 167 addr += size; 168 db_format_hex(tbuf, 24, value, FALSE); 169 db_printf("%-*s", width, tbuf); 170 break; 171 case 'd': /* signed decimal */ 172 value = db_get_value(addr, size, TRUE); 173 addr += size; 174 db_printf(DB_EXPR_T_IS_QUAD ? "%-*qd" : "%-*ld", 175 width, value); 176 break; 177 case 'u': /* unsigned decimal */ 178 value = db_get_value(addr, size, FALSE); 179 addr += size; 180 db_printf(DB_EXPR_T_IS_QUAD ? "%-*qu" : "%-*lu", 181 width, value); 182 break; 183 case 'o': /* unsigned octal */ 184 value = db_get_value(addr, size, FALSE); 185 addr += size; 186 db_printf(DB_EXPR_T_IS_QUAD ? "%-*qo" : "%-*lo", 187 width, value); 188 break; 189 case 'c': /* character */ 190 value = db_get_value(addr, 1, FALSE); 191 addr += 1; 192 if (value >= ' ' && value <= '~') 193 db_printf("%c", (char)value); 194 else 195 db_printf("\\%03o", (int)value); 196 break; 197 case 's': /* null-terminated string */ 198 for (;;) { 199 value = db_get_value(addr, 1, FALSE); 200 addr += 1; 201 if (value == 0) 202 break; 203 if (value >= ' ' && value <= '~') 204 db_printf("%c", (char)value); 205 else 206 db_printf("\\%03o", (int)value); 207 } 208 break; 209 case 'i': /* instruction */ 210 addr = db_disasm(addr, FALSE); 211 break; 212 case 'I': /* instruction, alternate form */ 213 addr = db_disasm(addr, TRUE); 214 break; 215 default: 216 break; 217 } 218 if (db_print_position() != 0) 219 db_end_line(); 220 } 221 } 222 db_next = addr; 223 } 224 225 /* 226 * Print value. 227 */ 228 static char db_print_format = 'x'; 229 230 /*ARGSUSED*/ 231 void 232 db_print_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif) 233 { 234 db_expr_t value; 235 236 if (modif[0] != '\0') 237 db_print_format = modif[0]; 238 239 switch (db_print_format) { 240 case 'a': 241 db_printsym((db_addr_t)addr, DB_STGY_ANY, db_printf); 242 break; 243 case 'r': 244 { 245 char tbuf[24]; 246 247 db_format_radix(tbuf, 24, addr, FALSE); 248 db_printf("%11s", tbuf); 249 break; 250 } 251 case 'x': 252 db_printf(DB_EXPR_T_IS_QUAD ? "%16qx" : "%8lx", addr); 253 break; 254 case 'z': 255 { 256 char tbuf[24]; 257 258 db_format_hex(tbuf, 24, addr, FALSE); 259 db_printf("%8s", tbuf); 260 break; 261 } 262 case 'd': 263 db_printf(DB_EXPR_T_IS_QUAD ? "%11qd" : "%11ld", addr); 264 break; 265 case 'u': 266 db_printf(DB_EXPR_T_IS_QUAD ? "%11qu" : "%11lu", addr); 267 break; 268 case 'o': 269 db_printf(DB_EXPR_T_IS_QUAD ? "%15qo" : "%16lo", addr); 270 break; 271 case 'c': 272 value = addr & 0xFF; 273 if (value >= ' ' && value <= '~') 274 db_printf("%c", (char)value); 275 else 276 db_printf("\\%03o", (int)value); 277 break; 278 } 279 db_printf("\n"); 280 } 281 282 void 283 db_print_loc_and_inst(db_addr_t loc) 284 { 285 286 db_printsym(loc, DB_STGY_PROC, db_printf); 287 db_printf(":\t"); 288 (void) db_disasm(loc, FALSE); 289 } 290 291 /* 292 * Search for a value in memory. 293 * Syntax: search [/bhl] addr value [mask] [,count] 294 */ 295 /*ARGSUSED*/ 296 void 297 db_search_cmd(db_expr_t daddr, int have_addr, db_expr_t dcount, char *modif) 298 { 299 int t; 300 db_addr_t addr; 301 int size; 302 db_expr_t value; 303 db_expr_t mask; 304 db_expr_t count; 305 306 t = db_read_token(); 307 if (t == tSLASH) { 308 t = db_read_token(); 309 if (t != tIDENT) { 310 bad_modifier: 311 db_printf("Bad modifier\n"); 312 db_flush_lex(); 313 return; 314 } 315 316 if (!strcmp(db_tok_string, "b")) 317 size = 1; 318 else if (!strcmp(db_tok_string, "h")) 319 size = 2; 320 else if (!strcmp(db_tok_string, "l")) 321 size = 4; 322 else 323 goto bad_modifier; 324 } else { 325 db_unread_token(t); 326 size = 4; 327 } 328 329 if (!db_expression(&value)) { 330 db_printf("Address missing\n"); 331 db_flush_lex(); 332 return; 333 } 334 addr = (db_addr_t) value; 335 336 if (!db_expression(&value)) { 337 db_printf("Value missing\n"); 338 db_flush_lex(); 339 return; 340 } 341 342 if (!db_expression(&mask)) 343 mask = (int) ~0; 344 345 t = db_read_token(); 346 if (t == tCOMMA) { 347 if (!db_expression(&count)) { 348 db_printf("Count missing\n"); 349 db_flush_lex(); 350 return; 351 } 352 } else { 353 db_unread_token(t); 354 count = -1; /* effectively forever */ 355 } 356 db_skip_to_eol(); 357 358 db_search(addr, size, value, mask, count); 359 } 360 361 static void 362 db_search(db_addr_t addr, int size, db_expr_t value, db_expr_t mask, 363 unsigned int count) 364 { 365 while (count-- != 0) { 366 db_prev = addr; 367 if ((db_get_value(addr, size, FALSE) & mask) == value) 368 break; 369 addr += size; 370 } 371 db_next = addr; 372 } 373
Indexes created Tue Sep 23 14:10:03 GMT 2025