sys/ddb/db_examine.c

   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  * $FreeBSD: src/sys/ddb/db_examine.c,v 1.27 1999/08/28 00:41:07 peter Exp $
  27  * $DragonFly: src/sys/ddb/db_examine.c,v 1.6 2005/12/23 21:35:44 swildner Exp $
  28  */
  29
  30 /*
  31  *      Author: David B. Golub, Carnegie Mellon University
  32  *      Date:   7/90
  33  */
  34
  35 #include <sys/param.h>
  36 #include <sys/systm.h>
  37
  38 #include <ddb/ddb.h>
  39
  40 #include <ddb/db_lex.h>
  41 #include <ddb/db_output.h>
  42 #include <ddb/db_command.h>
  43 #include <ddb/db_sym.h>
  44 #include <ddb/db_access.h>
  45
  46 static char     db_examine_format[TOK_STRING_SIZE] = "x";
  47
  48 static void     db_examine (db_addr_t, char *, int);
  49 static void     db_search (db_addr_t, int, db_expr_t, db_expr_t, u_int);
  50
  51 /*
  52  * Examine (print) data.
  53  */
  54 /*ARGSUSED*/
  55 void
  56 db_examine_cmd(db_expr_t addr, boolean_t have_addr, db_expr_t count,
  57                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 /*
  69  * Parameters:
  70  *     fmt:     format string
  71  *     count:   repeat count
  72  */
  73 static void
  74 db_examine(db_addr_t addr, char *fmt, int count)
  75 {
  76         int             c;
  77         db_expr_t       value;
  78         int             size;
  79         int             width;
  80         char *          fp;
  81
  82         while (--count >= 0) {
  83             fp = fmt;
  84             size = 4;
  85             width = 16;
  86             while ((c = *fp++) != 0) {
  87                 switch (c) {
  88                     case 'b':
  89                         size = 1;
  90                         width = 4;
  91                         break;
  92                     case 'h':
  93                         size = 2;
  94                         width = 8;
  95                         break;
  96                     case 'l':
  97                         size = 4;
  98                         width = 16;
  99                         break;
 100                     case 'g':
 101                         size = 8;
 102                         width = 32;
 103                         break;
 104                     case 'a':   /* address */
 105                         /* always forces a new line */
 106                         if (db_print_position() != 0)
 107                             db_printf("\n");
 108                         db_prev = addr;
 109                         db_printsym(addr, DB_STGY_ANY);
 110                         db_printf(":\t");
 111                         break;
 112                     default:
 113                         if (db_print_position() == 0) {
 114                             /* Print the address. */
 115                             db_printsym(addr, DB_STGY_ANY);
 116                             db_printf(":\t");
 117                             db_prev = addr;
 118                         }
 119
 120                         switch (c) {
 121                             case 'r':   /* signed, current radix */
 122                                 value = db_get_value(addr, size, TRUE);
 123                                 addr += size;
 124                                 db_printf("%+-*lr", width, (long)value);
 125                                 break;
 126                             case 'x':   /* unsigned hex */
 127                                 value = db_get_value(addr, size, FALSE);
 128                                 addr += size;
 129                                 db_printf("%-*lx", width, (long)value);
 130                                 break;
 131                             case 'z':   /* signed hex */
 132                                 value = db_get_value(addr, size, TRUE);
 133                                 addr += size;
 134                                 db_printf("%-*lz", width, (long)value);
 135                                 break;
 136                             case 'd':   /* signed decimal */
 137                                 value = db_get_value(addr, size, TRUE);
 138                                 addr += size;
 139                                 db_printf("%-*ld", width, (long)value);
 140                                 break;
 141                             case 'u':   /* unsigned decimal */
 142                                 value = db_get_value(addr, size, FALSE);
 143                                 addr += size;
 144                                 db_printf("%-*lu", width, (long)value);
 145                                 break;
 146                             case 'o':   /* unsigned octal */
 147                                 value = db_get_value(addr, size, FALSE);
 148                                 addr += size;
 149                                 db_printf("%-*lo", width, (long)value);
 150                                 break;
 151                             case 'c':   /* character */
 152                                 value = db_get_value(addr, 1, FALSE);
 153                                 addr += 1;
 154                                 if (value >= ' ' && value <= '~')
 155                                     db_printf("%c", (int)value);
 156                                 else
 157                                     db_printf("\\%03o", (int)value);
 158                                 break;
 159                             case 's':   /* null-terminated string */
 160                                 for (;;) {
 161                                     value = db_get_value(addr, 1, FALSE);
 162                                     addr += 1;
 163                                     if (value == 0)
 164                                         break;
 165                                     if (value >= ' ' && value <= '~')
 166                                         db_printf("%c", (int)value);
 167                                     else
 168                                         db_printf("\\%03o", (int)value);
 169                                 }
 170                                 break;
 171                             case 'i':   /* instruction */
 172                                 addr = db_disasm(addr, FALSE, NULL);
 173                                 break;
 174                             case 'I':   /* instruction, alternate form */
 175                                 addr = db_disasm(addr, TRUE, NULL);
 176                                 break;
 177                             default:
 178                                 break;
 179                         }
 180                         if (db_print_position() != 0)
 181                             db_end_line();
 182                         break;
 183                 }
 184             }
 185         }
 186         db_next = addr;
 187 }
 188
 189 /*
 190  * Print value.
 191  */
 192 static char     db_print_format = 'x';
 193
 194 /*ARGSUSED*/
 195 void
 196 db_print_cmd(db_expr_t addr, boolean_t have_addr, db_expr_t count, char *modif)
 197 {
 198         db_expr_t       value;
 199
 200         if (modif[0] != '\0')
 201             db_print_format = modif[0];
 202
 203         switch (db_print_format) {
 204             case 'a':
 205                 db_printsym((db_addr_t)addr, DB_STGY_ANY);
 206                 break;
 207             case 'r':
 208                 db_printf("%+11lr", (long)addr);
 209                 break;
 210             case 'x':
 211                 db_printf("%8lx", (unsigned long)addr);
 212                 break;
 213             case 'z':
 214                 db_printf("%8lz", (long)addr);
 215                 break;
 216             case 'd':
 217                 db_printf("%11ld", (long)addr);
 218                 break;
 219             case 'u':
 220                 db_printf("%11lu", (unsigned long)addr);
 221                 break;
 222             case 'o':
 223                 db_printf("%16lo", (unsigned long)addr);
 224                 break;
 225             case 'c':
 226                 value = addr & 0xFF;
 227                 if (value >= ' ' && value <= '~')
 228                     db_printf("%c", (int)value);
 229                 else
 230                     db_printf("\\%03o", (int)value);
 231                 break;
 232         }
 233         db_printf("\n");
 234 }
 235
 236 void
 237 db_print_loc_and_inst(db_addr_t loc, db_regs_t *regs)
 238 {
 239         db_printsym(loc, DB_STGY_PROC);
 240         db_printf(":\t");
 241         db_disasm(loc, TRUE, regs);
 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(db_expr_t dummy1, boolean_t dummy2, db_expr_t dummy3,
 250               char *dummy4)
 251 {
 252         int             t;
 253         db_addr_t       addr;
 254         int             size;
 255         db_expr_t       value;
 256         db_expr_t       mask;
 257         db_expr_t       count;
 258
 259         t = db_read_token();
 260         if (t == tSLASH) {
 261             t = db_read_token();
 262             if (t != tIDENT) {
 263               bad_modifier:
 264                 db_printf("Bad modifier\n");
 265                 db_flush_lex();
 266                 return;
 267             }
 268
 269             if (!strcmp(db_tok_string, "b"))
 270                 size = 1;
 271             else if (!strcmp(db_tok_string, "h"))
 272                 size = 2;
 273             else if (!strcmp(db_tok_string, "l"))
 274                 size = 4;
 275             else
 276                 goto bad_modifier;
 277         } else {
 278             db_unread_token(t);
 279             size = 4;
 280         }
 281
 282         if (!db_expression((db_expr_t *)&addr)) {
 283             db_printf("Address missing\n");
 284             db_flush_lex();
 285             return;
 286         }
 287
 288         if (!db_expression(&value)) {
 289             db_printf("Value missing\n");
 290             db_flush_lex();
 291             return;
 292         }
 293
 294         if (!db_expression(&mask))
 295             mask = 0xffffffffUL;
 296
 297         t = db_read_token();
 298         if (t == tCOMMA) {
 299             if (!db_expression(&count)) {
 300                 db_printf("Count missing\n");
 301                 db_flush_lex();
 302                 return;
 303             }
 304         } else {
 305             db_unread_token(t);
 306             count = -1;         /* effectively forever */
 307         }
 308         db_skip_to_eol();
 309
 310         db_search(addr, size, value, mask, count);
 311 }
 312
 313 static void
 314 db_search(db_addr_t addr, int size, db_expr_t value, db_expr_t mask,
 315           unsigned int count)
 316 {
 317         while (count-- != 0) {
 318                 db_prev = addr;
 319                 if ((db_get_value(addr, size, FALSE) & mask) == value)
 320                         break;
 321                 addr += size;
 322         }
 323         db_next = addr;
 324 }