Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/ddb/db_examine.c
Version:
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1 /*- 2 * SPDX-License-Identifier: MIT-CMU 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 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 /* 29 * Author: David B. Golub, Carnegie Mellon University 30 * Date: 7/90 31 */ 32 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 39 #include <ddb/ddb.h> 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 47 static char db_examine_format[TOK_STRING_SIZE] = "x"; 48 49 static void db_examine(db_addr_t, char *, int); 50 static void db_search(db_addr_t, int, db_expr_t, db_expr_t, u_int); 51 52 /* 53 * Examine (print) data. 54 */ 55 /*ARGSUSED*/ 56 void 57 db_examine_cmd(db_expr_t addr, bool have_addr, db_expr_t count, char *modif) 58 { 59 if (modif[0] != '\0') 60 db_strcpy(db_examine_format, modif); 61 62 if (count == -1) 63 count = 1; 64 65 db_examine((db_addr_t) addr, db_examine_format, count); 66 } 67 68 static void 69 db_examine(db_addr_t addr, char *fmt, int count) 70 { 71 int c; 72 db_expr_t value; 73 int size; 74 int width; 75 char * fp; 76 77 while (--count >= 0 && !db_pager_quit) { 78 fp = fmt; 79 size = 4; 80 while ((c = *fp++) != 0) { 81 switch (c) { 82 case 'b': 83 size = 1; 84 break; 85 case 'h': 86 size = 2; 87 break; 88 case 'l': 89 size = 4; 90 break; 91 case 'g': 92 size = 8; 93 break; 94 case 'a': /* address */ 95 size = sizeof(void *); 96 /* always forces a new line */ 97 if (db_print_position() != 0) 98 db_printf("\n"); 99 db_prev = addr; 100 db_printsym(addr, DB_STGY_ANY); 101 db_printf(":\t"); 102 break; 103 default: 104 if (db_print_position() == 0) { 105 /* Print the address. */ 106 db_printsym(addr, DB_STGY_ANY); 107 db_printf(":\t"); 108 db_prev = addr; 109 } 110 111 width = size * 4; 112 switch (c) { 113 case 'r': /* signed, current radix */ 114 value = db_get_value(addr, size, true); 115 addr += size; 116 db_printf("%+-*lr", width, (long)value); 117 break; 118 case 'x': /* unsigned hex */ 119 value = db_get_value(addr, size, false); 120 addr += size; 121 db_printf("%-*lx", width, (long)value); 122 break; 123 case 'z': /* signed hex */ 124 value = db_get_value(addr, size, true); 125 addr += size; 126 db_printf("%-*ly", width, (long)value); 127 break; 128 case 'd': /* signed decimal */ 129 value = db_get_value(addr, size, true); 130 addr += size; 131 db_printf("%-*ld", width, (long)value); 132 break; 133 case 'u': /* unsigned decimal */ 134 value = db_get_value(addr, size, false); 135 addr += size; 136 db_printf("%-*lu", width, (long)value); 137 break; 138 case 'o': /* unsigned octal */ 139 value = db_get_value(addr, size, false); 140 addr += size; 141 db_printf("%-*lo", width, (long)value); 142 break; 143 case 'c': /* character */ 144 value = db_get_value(addr, 1, false); 145 addr += 1; 146 if (value >= ' ' && value <= '~') 147 db_printf("%c", (int)value); 148 else 149 db_printf("\\%03o", (int)value); 150 break; 151 case 's': /* null-terminated string */ 152 for (;;) { 153 value = db_get_value(addr, 1, false); 154 addr += 1; 155 if (value == 0) 156 break; 157 if (value >= ' ' && value <= '~') 158 db_printf("%c", (int)value); 159 else 160 db_printf("\\%03o", (int)value); 161 } 162 break; 163 case 'S': /* symbol */ 164 value = db_get_value(addr, sizeof(void *), 165 false); 166 addr += sizeof(void *); 167 db_printsym(value, DB_STGY_ANY); 168 break; 169 case 'i': /* instruction */ 170 addr = db_disasm(addr, false); 171 break; 172 case 'I': /* instruction, alternate form */ 173 addr = db_disasm(addr, true); 174 break; 175 default: 176 break; 177 } 178 if (db_print_position() != 0) 179 db_end_line(1); 180 break; 181 } 182 } 183 } 184 db_next = addr; 185 } 186 187 /* 188 * Print value. 189 */ 190 static char db_print_format = 'x'; 191 192 /*ARGSUSED*/ 193 void 194 db_print_cmd(db_expr_t addr, bool have_addr, db_expr_t count, char *modif) 195 { 196 db_expr_t value; 197 198 if (modif[0] != '\0') 199 db_print_format = modif[0]; 200 201 switch (db_print_format) { 202 case 'a': 203 db_printsym((db_addr_t)addr, DB_STGY_ANY); 204 break; 205 case 'r': 206 db_printf("%+11lr", (long)addr); 207 break; 208 case 'x': 209 db_printf("%8lx", (unsigned long)addr); 210 break; 211 case 'z': 212 db_printf("%8ly", (long)addr); 213 break; 214 case 'd': 215 db_printf("%11ld", (long)addr); 216 break; 217 case 'u': 218 db_printf("%11lu", (unsigned long)addr); 219 break; 220 case 'o': 221 db_printf("%16lo", (unsigned long)addr); 222 break; 223 case 'c': 224 value = addr & 0xFF; 225 if (value >= ' ' && value <= '~') 226 db_printf("%c", (int)value); 227 else 228 db_printf("\\%03o", (int)value); 229 break; 230 default: 231 db_print_format = 'x'; 232 db_error("Syntax error: unsupported print modifier\n"); 233 /*NOTREACHED*/ 234 } 235 db_printf("\n"); 236 } 237 238 void 239 db_print_loc_and_inst(db_addr_t loc) 240 { 241 db_expr_t off; 242 243 db_printsym(loc, DB_STGY_PROC); 244 if (db_search_symbol(loc, DB_STGY_PROC, &off) != C_DB_SYM_NULL) { 245 db_printf(":\t"); 246 (void)db_disasm(loc, false); 247 } 248 } 249 250 /* 251 * Search for a value in memory. 252 * Syntax: search [/bhl] addr value [mask] [,count] 253 */ 254 void 255 db_search_cmd(db_expr_t dummy1, bool dummy2, db_expr_t dummy3, char *dummy4) 256 { 257 int t; 258 db_addr_t addr; 259 int size; 260 db_expr_t value; 261 db_expr_t mask; 262 db_expr_t count; 263 264 t = db_read_token(); 265 if (t == tSLASH) { 266 t = db_read_token(); 267 if (t != tIDENT) { 268 bad_modifier: 269 db_printf("Bad modifier\n"); 270 db_flush_lex(); 271 return; 272 } 273 274 if (!strcmp(db_tok_string, "b")) 275 size = 1; 276 else if (!strcmp(db_tok_string, "h")) 277 size = 2; 278 else if (!strcmp(db_tok_string, "l")) 279 size = 4; 280 else 281 goto bad_modifier; 282 } else { 283 db_unread_token(t); 284 size = 4; 285 } 286 287 if (!db_expression((db_expr_t *)&addr)) { 288 db_printf("Address missing\n"); 289 db_flush_lex(); 290 return; 291 } 292 293 if (!db_expression(&value)) { 294 db_printf("Value missing\n"); 295 db_flush_lex(); 296 return; 297 } 298 299 if (!db_expression(&mask)) 300 mask = 0xffffffffUL; 301 302 t = db_read_token(); 303 if (t == tCOMMA) { 304 if (!db_expression(&count)) { 305 db_printf("Count missing\n"); 306 db_flush_lex(); 307 return; 308 } 309 } else { 310 db_unread_token(t); 311 count = -1; /* effectively forever */ 312 } 313 db_skip_to_eol(); 314 315 db_search(addr, size, value, mask, count); 316 } 317 318 static void 319 db_search(db_addr_t addr, int size, db_expr_t value, db_expr_t mask, 320 unsigned int count) 321 { 322 while (count-- != 0) { 323 db_prev = addr; 324 if ((db_get_value(addr, size, false) & mask) == value) 325 break; 326 addr += size; 327 } 328 db_next = addr; 329 }
Cache object: 2f53a26c901bf503c44f16dde40c22dc
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