db_examine.c revision 1.38
1 /* $NetBSD: db_examine.c,v 1.38 2019/09/10 08:16:05 ryo 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 1.38 2019/09/10 08:16:05 ryo 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 'q': 105 if (sizeof(db_expr_t) != sizeof(uint64_t)) { 106 size = -1; 107 db_error("q not supported\n"); 108 /*NOTREACHED*/ 109 } 110 /* FALLTHROUGH */ 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", (long)addr); 117 break; 118 case 'p': 119 size = sizeof(void *); 120 value = db_get_value(addr, size, true); 121 addr += size; 122 db_printf("= 0x%lx ", (long)value); 123 db_printsym((db_addr_t)value, DB_STGY_ANY, db_printf); 124 db_printf("\n"); 125 break; 126 case 'r': /* signed, current radix */ 127 value = db_get_value(addr, size, true); 128 addr += size; 129 db_format_radix(tbuf, 24, value, false); 130 db_printf("%-*s", width, tbuf); 131 break; 132 case 'x': /* unsigned hex */ 133 value = db_get_value(addr, size, false); 134 addr += size; 135 db_printf("%-*" DDB_EXPR_FMT "x", width, value); 136 break; 137 case 'm': /* hex dump */ 138 /* 139 * Print off in chunks of size. Try to print 16 140 * bytes at a time into 4 columns. This 141 * loops modify's count extra times in order 142 * to get the nicely formatted lines. 143 */ 144 145 bytes = 0; 146 do { 147 for (i = 0; i < size; i++) { 148 value = 149 db_get_value(addr+bytes, 1, 150 false); 151 db_printf( 152 "%02" DDB_EXPR_FMT "x", 153 value); 154 bytes++; 155 if (!(bytes % 4)) 156 db_printf(" "); 157 } 158 } while ((bytes != 16) && count--); 159 /* True up the columns before continuing */ 160 for (i = 4; i >= (bytes / 4); i--) 161 db_printf ("\t"); 162 /* Print chars, use . for non-printable's. */ 163 while (bytes--) { 164 value = db_get_value(addr, 1, false); 165 addr += 1; 166 if (value >= ' ' && value <= '~') 167 db_printf("%c", (char)value); 168 else 169 db_printf("."); 170 } 171 db_printf("\n"); 172 break; 173 case 'z': /* signed hex */ 174 value = db_get_value(addr, size, true); 175 addr += size; 176 db_format_hex(tbuf, 24, value, false); 177 db_printf("%-*s", width, tbuf); 178 break; 179 case 'd': /* signed decimal */ 180 value = db_get_value(addr, size, true); 181 addr += size; 182 db_printf("%-*" DDB_EXPR_FMT "d", width, value); 183 break; 184 case 'u': /* unsigned decimal */ 185 value = db_get_value(addr, size, false); 186 addr += size; 187 db_printf("%-*" DDB_EXPR_FMT "u", width, value); 188 break; 189 case 'o': /* unsigned octal */ 190 value = db_get_value(addr, size, false); 191 addr += size; 192 db_printf("%-*" DDB_EXPR_FMT "o", width, value); 193 break; 194 case 'c': /* character */ 195 value = db_get_value(addr, 1, false); 196 addr += 1; 197 if (value >= ' ' && value <= '~') 198 db_printf("%c", (char)value); 199 else 200 db_printf("\\%03o", (int)value); 201 break; 202 case 's': /* null-terminated string */ 203 for (;;) { 204 value = db_get_value(addr, 1, false); 205 addr += 1; 206 if (value == 0) 207 break; 208 if (value >= ' ' && value <= '~') 209 db_printf("%c", (char)value); 210 else 211 db_printf("\\%03o", (int)value); 212 } 213 break; 214 case 'i': /* instruction */ 215 addr = db_disasm(addr, false); 216 break; 217 case 'I': /* instruction, alternate form */ 218 addr = db_disasm(addr, true); 219 break; 220 default: 221 break; 222 } 223 if (db_print_position() != 0) 224 db_end_line(); 225 } 226 } 227 db_next = addr; 228 } 229 230 /* 231 * Print value. 232 */ 233 static char db_print_format = 'x'; 234 235 /*ARGSUSED*/ 236 void 237 db_print_cmd(db_expr_t addr, bool have_addr, db_expr_t count, 238 const char *modif) 239 { 240 db_expr_t value; 241 242 if (modif[0] != '\0') 243 db_print_format = modif[0]; 244 245 switch (db_print_format) { 246 case 'a': 247 db_printsym((db_addr_t)addr, DB_STGY_ANY, db_printf); 248 break; 249 case 'r': 250 { 251 char tbuf[24]; 252 253 db_format_radix(tbuf, 24, addr, false); 254 db_printf("%11s", tbuf); 255 break; 256 } 257 case 'x': 258 db_printf("%16" DDB_EXPR_FMT "x", addr); 259 break; 260 case 'z': 261 { 262 char tbuf[24]; 263 264 db_format_hex(tbuf, 24, addr, false); 265 db_printf("%8s", tbuf); 266 break; 267 } 268 case 'd': 269 db_printf("%11" DDB_EXPR_FMT "d", addr); 270 break; 271 case 'u': 272 db_printf("%11" DDB_EXPR_FMT "u", addr); 273 break; 274 case 'o': 275 db_printf("%15" DDB_EXPR_FMT "o", addr); 276 break; 277 case 'c': 278 value = addr & 0xFF; 279 if (value >= ' ' && value <= '~') 280 db_printf("%c", (char)value); 281 else 282 db_printf("\\%03o", (int)value); 283 break; 284 } 285 db_printf("\n"); 286 } 287 288 void 289 db_print_loc_and_inst(db_addr_t loc) 290 { 291 292 db_printsym(loc, DB_STGY_PROC, db_printf); 293 db_printf(":\t"); 294 (void) db_disasm(loc, false); 295 } 296 297 /* 298 * Search for a value in memory. 299 * Syntax: search [/bhl] addr value [mask] [,count] 300 */ 301 /*ARGSUSED*/ 302 void 303 db_search_cmd(db_expr_t daddr, bool have_addr, 304 db_expr_t dcount, const char *modif) 305 { 306 int t; 307 db_addr_t addr; 308 int size; 309 db_expr_t value; 310 db_expr_t mask; 311 db_expr_t count; 312 313 t = db_read_token(); 314 if (t == tSLASH) { 315 t = db_read_token(); 316 if (t != tIDENT) { 317 bad_modifier: 318 db_printf("Bad modifier\n"); 319 db_flush_lex(); 320 return; 321 } 322 323 if (!strcmp(db_tok_string, "b")) 324 size = 1; 325 else if (!strcmp(db_tok_string, "h")) 326 size = 2; 327 else if (!strcmp(db_tok_string, "l")) 328 size = 4; 329 else 330 goto bad_modifier; 331 } else { 332 db_unread_token(t); 333 size = 4; 334 } 335 336 if (!db_expression(&value)) { 337 db_printf("Address missing\n"); 338 db_flush_lex(); 339 return; 340 } 341 addr = (db_addr_t) value; 342 343 if (!db_expression(&value)) { 344 db_printf("Value missing\n"); 345 db_flush_lex(); 346 return; 347 } 348 349 if (!db_expression(&mask)) 350 mask = (int) ~0; 351 352 t = db_read_token(); 353 if (t == tCOMMA) { 354 if (!db_expression(&count)) { 355 db_printf("Count missing\n"); 356 db_flush_lex(); 357 return; 358 } 359 } else { 360 db_unread_token(t); 361 count = -1; /* effectively forever */ 362 } 363 db_skip_to_eol(); 364 365 db_search(addr, size, value, mask, count); 366 } 367 368 static void 369 db_search(db_addr_t addr, int size, db_expr_t value, db_expr_t mask, 370 unsigned int count) 371 { 372 while (count-- != 0) { 373 db_prev = addr; 374 if ((db_get_value(addr, size, false) & mask) == value) 375 break; 376 addr += size; 377 } 378 db_next = addr; 379 } 380
Indexes created Fri Sep 26 20:09:58 GMT 2025