db_examine.c revision 308418
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: stable/11/sys/ddb/db_examine.c 308418 2016-11-07 12:10:17Z kib $"); 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(db_expr_t addr, bool have_addr, db_expr_t count, char *modif) 56{ 57 if (modif[0] != '\0') 58 db_strcpy(db_examine_format, modif); 59 60 if (count == -1) 61 count = 1; 62 63 db_examine((db_addr_t) addr, db_examine_format, count); 64} 65 66static void 67db_examine(db_addr_t addr, char *fmt, int count) 68{ 69 int c; 70 db_expr_t value; 71 int size; 72 int width; 73 char * fp; 74 75 while (--count >= 0 && !db_pager_quit) { 76 fp = fmt; 77 size = 4; 78 while ((c = *fp++) != 0) { 79 switch (c) { 80 case 'b': 81 size = 1; 82 break; 83 case 'h': 84 size = 2; 85 break; 86 case 'l': 87 size = 4; 88 break; 89 case 'g': 90 size = 8; 91 break; 92 case 'a': /* address */ 93 size = sizeof(void *); 94 /* always forces a new line */ 95 if (db_print_position() != 0) 96 db_printf("\n"); 97 db_prev = addr; 98 db_printsym(addr, DB_STGY_ANY); 99 db_printf(":\t"); 100 break; 101 default: 102 if (db_print_position() == 0) { 103 /* Print the address. */ 104 db_printsym(addr, DB_STGY_ANY); 105 db_printf(":\t"); 106 db_prev = addr; 107 } 108 109 width = size * 4; 110 switch (c) { 111 case 'r': /* signed, current radix */ 112 value = db_get_value(addr, size, true); 113 addr += size; 114 db_printf("%+-*lr", width, (long)value); 115 break; 116 case 'x': /* unsigned hex */ 117 value = db_get_value(addr, size, false); 118 addr += size; 119 db_printf("%-*lx", width, (long)value); 120 break; 121 case 'z': /* signed hex */ 122 value = db_get_value(addr, size, true); 123 addr += size; 124 db_printf("%-*ly", width, (long)value); 125 break; 126 case 'd': /* signed decimal */ 127 value = db_get_value(addr, size, true); 128 addr += size; 129 db_printf("%-*ld", width, (long)value); 130 break; 131 case 'u': /* unsigned decimal */ 132 value = db_get_value(addr, size, false); 133 addr += size; 134 db_printf("%-*lu", width, (long)value); 135 break; 136 case 'o': /* unsigned octal */ 137 value = db_get_value(addr, size, false); 138 addr += size; 139 db_printf("%-*lo", width, (long)value); 140 break; 141 case 'c': /* character */ 142 value = db_get_value(addr, 1, false); 143 addr += 1; 144 if (value >= ' ' && value <= '~') 145 db_printf("%c", (int)value); 146 else 147 db_printf("\\%03o", (int)value); 148 break; 149 case 's': /* null-terminated string */ 150 for (;;) { 151 value = db_get_value(addr, 1, false); 152 addr += 1; 153 if (value == 0) 154 break; 155 if (value >= ' ' && value <= '~') 156 db_printf("%c", (int)value); 157 else 158 db_printf("\\%03o", (int)value); 159 } 160 break; 161 case 'S': /* symbol */ 162 value = db_get_value(addr, sizeof(void *), 163 false); 164 addr += sizeof(void *); 165 db_printsym(value, DB_STGY_ANY); 166 break; 167 case 'i': /* instruction */ 168 addr = db_disasm(addr, false); 169 break; 170 case 'I': /* instruction, alternate form */ 171 addr = db_disasm(addr, true); 172 break; 173 default: 174 break; 175 } 176 if (db_print_position() != 0) 177 db_end_line(1); 178 break; 179 } 180 } 181 } 182 db_next = addr; 183} 184 185/* 186 * Print value. 187 */ 188static char db_print_format = 'x'; 189 190/*ARGSUSED*/ 191void 192db_print_cmd(db_expr_t addr, bool have_addr, db_expr_t count, char *modif) 193{ 194 db_expr_t value; 195 196 if (modif[0] != '\0') 197 db_print_format = modif[0]; 198 199 switch (db_print_format) { 200 case 'a': 201 db_printsym((db_addr_t)addr, DB_STGY_ANY); 202 break; 203 case 'r': 204 db_printf("%+11lr", (long)addr); 205 break; 206 case 'x': 207 db_printf("%8lx", (unsigned long)addr); 208 break; 209 case 'z': 210 db_printf("%8ly", (long)addr); 211 break; 212 case 'd': 213 db_printf("%11ld", (long)addr); 214 break; 215 case 'u': 216 db_printf("%11lu", (unsigned long)addr); 217 break; 218 case 'o': 219 db_printf("%16lo", (unsigned long)addr); 220 break; 221 case 'c': 222 value = addr & 0xFF; 223 if (value >= ' ' && value <= '~') 224 db_printf("%c", (int)value); 225 else 226 db_printf("\\%03o", (int)value); 227 break; 228 default: 229 db_print_format = 'x'; 230 db_error("Syntax error: unsupported print modifier\n"); 231 /*NOTREACHED*/ 232 } 233 db_printf("\n"); 234} 235 236void 237db_print_loc_and_inst(db_addr_t loc) 238{ 239 db_expr_t off; 240 241 db_printsym(loc, DB_STGY_PROC); 242 if (db_search_symbol(loc, DB_STGY_PROC, &off) != C_DB_SYM_NULL) { 243 db_printf(":\t"); 244 (void)db_disasm(loc, false); 245 } 246} 247 248/* 249 * Search for a value in memory. 250 * Syntax: search [/bhl] addr value [mask] [,count] 251 */ 252void 253db_search_cmd(db_expr_t dummy1, bool dummy2, db_expr_t dummy3, char *dummy4) 254{ 255 int t; 256 db_addr_t addr; 257 int size; 258 db_expr_t value; 259 db_expr_t mask; 260 db_expr_t count; 261 262 t = db_read_token(); 263 if (t == tSLASH) { 264 t = db_read_token(); 265 if (t != tIDENT) { 266 bad_modifier: 267 db_printf("Bad modifier\n"); 268 db_flush_lex(); 269 return; 270 } 271 272 if (!strcmp(db_tok_string, "b")) 273 size = 1; 274 else if (!strcmp(db_tok_string, "h")) 275 size = 2; 276 else if (!strcmp(db_tok_string, "l")) 277 size = 4; 278 else 279 goto bad_modifier; 280 } else { 281 db_unread_token(t); 282 size = 4; 283 } 284 285 if (!db_expression((db_expr_t *)&addr)) { 286 db_printf("Address missing\n"); 287 db_flush_lex(); 288 return; 289 } 290 291 if (!db_expression(&value)) { 292 db_printf("Value missing\n"); 293 db_flush_lex(); 294 return; 295 } 296 297 if (!db_expression(&mask)) 298 mask = 0xffffffffUL; 299 300 t = db_read_token(); 301 if (t == tCOMMA) { 302 if (!db_expression(&count)) { 303 db_printf("Count missing\n"); 304 db_flush_lex(); 305 return; 306 } 307 } else { 308 db_unread_token(t); 309 count = -1; /* effectively forever */ 310 } 311 db_skip_to_eol(); 312 313 db_search(addr, size, value, mask, count); 314} 315 316static void 317db_search(db_addr_t addr, int size, db_expr_t value, db_expr_t mask, 318 unsigned int count) 319{ 320 while (count-- != 0) { 321 db_prev = addr; 322 if ((db_get_value(addr, size, false) & mask) == value) 323 break; 324 addr += size; 325 } 326 db_next = addr; 327} 328