db_examine.c revision 163134
1/*- 2 * Mach Operating System 3 * Copyright (c) 1991,1990 Carnegie Mellon University 4 * All Rights Reserved. 5 * 6 * Permission to use, copy, modify and distribute this software and its 7 * documentation is hereby granted, provided that both the copyright 8 * notice and this permission notice appear in all copies of the 9 * software, derivative works or modified versions, and any portions 10 * thereof, and that both notices appear in supporting documentation. 11 * 12 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS 13 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 14 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 15 * 16 * Carnegie Mellon requests users of this software to return to 17 * 18 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 19 * School of Computer Science 20 * Carnegie Mellon University 21 * Pittsburgh PA 15213-3890 22 * 23 * any improvements or extensions that they make and grant Carnegie the 24 * rights to redistribute these changes. 25 */ 26/* 27 * Author: David B. Golub, Carnegie Mellon University 28 * Date: 7/90 29 */ 30 31#include <sys/cdefs.h> 32__FBSDID("$FreeBSD: head/sys/ddb/db_examine.c 163134 2006-10-08 18:15:08Z bde $"); 33 34#include <sys/param.h> 35#include <sys/systm.h> 36 37#include <ddb/ddb.h> 38 39#include <ddb/db_lex.h> 40#include <ddb/db_output.h> 41#include <ddb/db_command.h> 42#include <ddb/db_sym.h> 43#include <ddb/db_access.h> 44 45static char db_examine_format[TOK_STRING_SIZE] = "x"; 46 47static void db_examine(db_addr_t, char *, int); 48static void db_search(db_addr_t, int, db_expr_t, db_expr_t, u_int); 49 50/* 51 * Examine (print) data. 52 */ 53/*ARGSUSED*/ 54void 55db_examine_cmd(addr, have_addr, count, modif) 56 db_expr_t addr; 57 boolean_t have_addr; 58 db_expr_t count; 59 char * modif; 60{ 61 if (modif[0] != '\0') 62 db_strcpy(db_examine_format, modif); 63 64 if (count == -1) 65 count = 1; 66 67 db_examine((db_addr_t) addr, db_examine_format, count); 68} 69 70static void 71db_examine(addr, fmt, count) 72 register 73 db_addr_t addr; 74 char * fmt; /* format string */ 75 int count; /* repeat count */ 76{ 77 int c; 78 db_expr_t value; 79 int size; 80 int width; 81 char * fp; 82 83 while (--count >= 0) { 84 fp = fmt; 85 size = 4; 86 while ((c = *fp++) != 0) { 87 switch (c) { 88 case 'b': 89 size = 1; 90 break; 91 case 'h': 92 size = 2; 93 break; 94 case 'l': 95 size = 4; 96 break; 97 case 'g': 98 size = 8; 99 break; 100 case 'a': /* address */ 101 size = sizeof(void *); 102 /* always forces a new line */ 103 if (db_print_position() != 0) 104 db_printf("\n"); 105 db_prev = addr; 106 db_printsym(addr, DB_STGY_ANY); 107 db_printf(":\t"); 108 break; 109 default: 110 if (db_print_position() == 0) { 111 /* Print the address. */ 112 db_printsym(addr, DB_STGY_ANY); 113 db_printf(":\t"); 114 db_prev = addr; 115 } 116 117 width = size * 4; 118 switch (c) { 119 case 'r': /* signed, current radix */ 120 value = db_get_value(addr, size, TRUE); 121 addr += size; 122 db_printf("%+-*lr", width, (long)value); 123 break; 124 case 'x': /* unsigned hex */ 125 value = db_get_value(addr, size, FALSE); 126 addr += size; 127 db_printf("%-*lx", width, (long)value); 128 break; 129 case 'z': /* signed hex */ 130 value = db_get_value(addr, size, TRUE); 131 addr += size; 132 db_printf("%-*ly", width, (long)value); 133 break; 134 case 'd': /* signed decimal */ 135 value = db_get_value(addr, size, TRUE); 136 addr += size; 137 db_printf("%-*ld", width, (long)value); 138 break; 139 case 'u': /* unsigned decimal */ 140 value = db_get_value(addr, size, FALSE); 141 addr += size; 142 db_printf("%-*lu", width, (long)value); 143 break; 144 case 'o': /* unsigned octal */ 145 value = db_get_value(addr, size, FALSE); 146 addr += size; 147 db_printf("%-*lo", width, (long)value); 148 break; 149 case 'c': /* character */ 150 value = db_get_value(addr, 1, FALSE); 151 addr += 1; 152 if (value >= ' ' && value <= '~') 153 db_printf("%c", (int)value); 154 else 155 db_printf("\\%03o", (int)value); 156 break; 157 case 's': /* null-terminated string */ 158 for (;;) { 159 value = db_get_value(addr, 1, FALSE); 160 addr += 1; 161 if (value == 0) 162 break; 163 if (value >= ' ' && value <= '~') 164 db_printf("%c", (int)value); 165 else 166 db_printf("\\%03o", (int)value); 167 } 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 */ 190static char db_print_format = 'x'; 191 192/*ARGSUSED*/ 193void 194db_print_cmd(addr, have_addr, count, modif) 195 db_expr_t addr; 196 boolean_t have_addr; 197 db_expr_t count; 198 char * modif; 199{ 200 db_expr_t value; 201 202 if (modif[0] != '\0') 203 db_print_format = modif[0]; 204 205 switch (db_print_format) { 206 case 'a': 207 db_printsym((db_addr_t)addr, DB_STGY_ANY); 208 break; 209 case 'r': 210 db_printf("%+11lr", (long)addr); 211 break; 212 case 'x': 213 db_printf("%8lx", (unsigned long)addr); 214 break; 215 case 'z': 216 db_printf("%8ly", (long)addr); 217 break; 218 case 'd': 219 db_printf("%11ld", (long)addr); 220 break; 221 case 'u': 222 db_printf("%11lu", (unsigned long)addr); 223 break; 224 case 'o': 225 db_printf("%16lo", (unsigned long)addr); 226 break; 227 case 'c': 228 value = addr & 0xFF; 229 if (value >= ' ' && value <= '~') 230 db_printf("%c", (int)value); 231 else 232 db_printf("\\%03o", (int)value); 233 break; 234 } 235 db_printf("\n"); 236} 237 238void 239db_print_loc_and_inst(loc) 240 db_addr_t loc; 241{ 242 db_printsym(loc, DB_STGY_PROC); 243 db_printf(":\t"); 244 (void) db_disasm(loc, TRUE); 245} 246 247/* 248 * Search for a value in memory. 249 * Syntax: search [/bhl] addr value [mask] [,count] 250 */ 251void 252db_search_cmd(dummy1, dummy2, dummy3, dummy4) 253 db_expr_t dummy1; 254 boolean_t dummy2; 255 db_expr_t dummy3; 256 char * dummy4; 257{ 258 int t; 259 db_addr_t addr; 260 int size; 261 db_expr_t value; 262 db_expr_t mask; 263 db_expr_t count; 264 265 t = db_read_token(); 266 if (t == tSLASH) { 267 t = db_read_token(); 268 if (t != tIDENT) { 269 bad_modifier: 270 db_printf("Bad modifier\n"); 271 db_flush_lex(); 272 return; 273 } 274 275 if (!strcmp(db_tok_string, "b")) 276 size = 1; 277 else if (!strcmp(db_tok_string, "h")) 278 size = 2; 279 else if (!strcmp(db_tok_string, "l")) 280 size = 4; 281 else 282 goto bad_modifier; 283 } else { 284 db_unread_token(t); 285 size = 4; 286 } 287 288 if (!db_expression((db_expr_t *)&addr)) { 289 db_printf("Address missing\n"); 290 db_flush_lex(); 291 return; 292 } 293 294 if (!db_expression(&value)) { 295 db_printf("Value missing\n"); 296 db_flush_lex(); 297 return; 298 } 299 300 if (!db_expression(&mask)) 301 mask = 0xffffffffUL; 302 303 t = db_read_token(); 304 if (t == tCOMMA) { 305 if (!db_expression(&count)) { 306 db_printf("Count missing\n"); 307 db_flush_lex(); 308 return; 309 } 310 } else { 311 db_unread_token(t); 312 count = -1; /* effectively forever */ 313 } 314 db_skip_to_eol(); 315 316 db_search(addr, size, value, mask, count); 317} 318 319static void 320db_search(addr, size, value, mask, count) 321 register 322 db_addr_t addr; 323 int size; 324 db_expr_t value; 325 db_expr_t mask; 326 unsigned int count; 327{ 328 while (count-- != 0) { 329 db_prev = addr; 330 if ((db_get_value(addr, size, FALSE) & mask) == value) 331 break; 332 addr += size; 333 } 334 db_next = addr; 335} 336