db_examine.c revision 1.9
1 /* $NetBSD: db_examine.c,v 1.9 1994/11/17 04:51:50 gwr 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 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/param.h> 33 #include <sys/proc.h> 34 35 #include <machine/db_machdep.h> /* type definitions */ 36 37 #include <ddb/db_lex.h> 38 #include <ddb/db_output.h> 39 #include <ddb/db_command.h> 40 #include <ddb/db_sym.h> 41 42 char db_examine_format[TOK_STRING_SIZE] = "x"; 43 44 extern db_addr_t db_disasm(/* db_addr_t, boolean_t */); 45 /* instruction disassembler */ 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(addr, have_addr, count, modif) 58 db_expr_t addr; 59 int have_addr; 60 db_expr_t count; 61 char * modif; 62 { 63 if (modif[0] != '\0') 64 db_strcpy(db_examine_format, modif); 65 66 if (count == -1) 67 count = 1; 68 69 db_examine((db_addr_t) addr, db_examine_format, count); 70 } 71 72 db_examine(addr, fmt, count) 73 register 74 db_addr_t addr; 75 char * fmt; /* format string */ 76 int count; /* repeat count */ 77 { 78 int c; 79 db_expr_t value; 80 int size; 81 int width; 82 char * fp; 83 84 while (--count >= 0) { 85 fp = fmt; 86 size = 4; 87 width = 12; 88 while ((c = *fp++) != 0) { 89 if (db_print_position() == 0) { 90 /* Always print the address. */ 91 db_printsym(addr, DB_STGY_ANY); 92 db_printf(":\t"); 93 db_prev = addr; 94 } 95 switch (c) { 96 case 'b': /* byte */ 97 size = 1; 98 width = 4; 99 break; 100 case 'h': /* half-word */ 101 size = 2; 102 width = 8; 103 break; 104 case 'l': /* long-word */ 105 size = 4; 106 width = 12; 107 break; 108 case 'a': /* address */ 109 db_printf("= 0x%x\n", addr); 110 break; 111 case 'r': /* signed, current radix */ 112 value = db_get_value(addr, size, TRUE); 113 addr += size; 114 db_printf("%-*r", width, value); 115 break; 116 case 'x': /* unsigned hex */ 117 value = db_get_value(addr, size, FALSE); 118 addr += size; 119 db_printf("%-*x", width, value); 120 break; 121 case 'z': /* signed hex */ 122 value = db_get_value(addr, size, TRUE); 123 addr += size; 124 db_printf("%-*z", width, value); 125 break; 126 case 'd': /* signed decimal */ 127 value = db_get_value(addr, size, TRUE); 128 addr += size; 129 db_printf("%-*d", width, value); 130 break; 131 case 'u': /* unsigned decimal */ 132 value = db_get_value(addr, size, FALSE); 133 addr += size; 134 db_printf("%-*u", width, value); 135 break; 136 case 'o': /* unsigned octal */ 137 value = db_get_value(addr, size, FALSE); 138 addr += size; 139 db_printf("%-*o", width, 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", value); 146 else 147 db_printf("\\%03o", 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", value); 157 else 158 db_printf("\\%03o", value); 159 } 160 break; 161 case 'i': /* instruction */ 162 addr = db_disasm(addr, FALSE); 163 break; 164 case 'I': /* instruction, alternate form */ 165 addr = db_disasm(addr, TRUE); 166 break; 167 default: 168 break; 169 } 170 if (db_print_position() != 0) 171 db_end_line(); 172 } 173 } 174 db_next = addr; 175 } 176 177 /* 178 * Print value. 179 */ 180 char db_print_format = 'x'; 181 182 /*ARGSUSED*/ 183 void 184 db_print_cmd(addr, have_addr, count, modif) 185 db_expr_t addr; 186 int have_addr; 187 db_expr_t count; 188 char * modif; 189 { 190 db_expr_t value; 191 192 if (modif[0] != '\0') 193 db_print_format = modif[0]; 194 195 switch (db_print_format) { 196 case 'a': 197 db_printsym((db_addr_t)addr, DB_STGY_ANY); 198 break; 199 case 'r': 200 db_printf("%11r", addr); 201 break; 202 case 'x': 203 db_printf("%8x", addr); 204 break; 205 case 'z': 206 db_printf("%8z", addr); 207 break; 208 case 'd': 209 db_printf("%11d", addr); 210 break; 211 case 'u': 212 db_printf("%11u", addr); 213 break; 214 case 'o': 215 db_printf("%16o", addr); 216 break; 217 case 'c': 218 value = addr & 0xFF; 219 if (value >= ' ' && value <= '~') 220 db_printf("%c", value); 221 else 222 db_printf("\\%03o", value); 223 break; 224 } 225 db_printf("\n"); 226 } 227 228 db_print_loc_and_inst(loc) 229 db_addr_t loc; 230 { 231 db_printsym(loc, DB_STGY_PROC); 232 db_printf(":\t"); 233 (void) db_disasm(loc, FALSE); 234 } 235 236 db_strcpy(dst, src) 237 register char *dst; 238 register char *src; 239 { 240 while (*dst++ = *src++) 241 ; 242 } 243 244 /* 245 * Search for a value in memory. 246 * Syntax: search [/bhl] addr value [mask] [,count] 247 */ 248 void 249 db_search_cmd() 250 { 251 int t; 252 db_addr_t addr; 253 int size; 254 db_expr_t value; 255 db_expr_t mask; 256 unsigned int count; 257 258 t = db_read_token(); 259 if (t == tSLASH) { 260 t = db_read_token(); 261 if (t != tIDENT) { 262 bad_modifier: 263 db_printf("Bad modifier\n"); 264 db_flush_lex(); 265 return; 266 } 267 268 if (!strcmp(db_tok_string, "b")) 269 size = 1; 270 else if (!strcmp(db_tok_string, "h")) 271 size = 2; 272 else if (!strcmp(db_tok_string, "l")) 273 size = 4; 274 else 275 goto bad_modifier; 276 } else { 277 db_unread_token(t); 278 size = 4; 279 } 280 281 if (!db_expression(&addr)) { 282 db_printf("Address missing\n"); 283 db_flush_lex(); 284 return; 285 } 286 287 if (!db_expression(&value)) { 288 db_printf("Value missing\n"); 289 db_flush_lex(); 290 return; 291 } 292 293 if (!db_expression(&mask)) 294 mask = 0xffffffff; 295 296 t = db_read_token(); 297 if (t == tCOMMA) { 298 if (!db_expression(&count)) { 299 db_printf("Count missing\n"); 300 db_flush_lex(); 301 return; 302 } 303 } else { 304 db_unread_token(t); 305 count = -1; /* effectively forever */ 306 } 307 db_skip_to_eol(); 308 309 db_search(addr, size, value, mask, count); 310 } 311 312 db_search(addr, size, value, mask, count) 313 register 314 db_addr_t addr; 315 int size; 316 db_expr_t value; 317 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
Indexes created Mon Sep 22 13:09:51 GMT 2025