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  */
  28
  29 /*
  30  *      Author: David B. Golub, Carnegie Mellon University
  31  *      Date:   7/90
  32  */
  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
  45 static char     db_examine_format[TOK_STRING_SIZE] = "x";
  46
  47 static void     db_examine (db_addr_t, char *, int);
  48 static void     db_search (db_addr_t, int, db_expr_t, db_expr_t, u_int);
  49
  50 /*
  51  * Examine (print) data.
  52  */
  53 /*ARGSUSED*/
  54 void
  55 db_examine_cmd(db_expr_t addr, boolean_t have_addr, db_expr_t count,
  56                char *modif)
  57 {
  58         if (modif[0] != '\0')
  59             db_strcpy(db_examine_format, modif);
  60
  61         if (count == -1)
  62             count = 1;
  63
  64         db_examine((db_addr_t) addr, db_examine_format, count);
  65 }
  66
  67 /*
  68  * Parameters:
  69  *     fmt:     format string
  70  *     count:   repeat count
  71  */
  72 static void
  73 db_examine(db_addr_t addr, char *fmt, int count)
  74 {
  75         int             c;
  76         db_expr_t       value;
  77         int             size;
  78         int             width;
  79         char *          fp;
  80         char            tbuf[24];
  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_format_hex(tbuf, 24, value, FALSE);
 135                                 db_printf("%-*s", width, tbuf);
 136                                 break;
 137                             case 'd':   /* signed decimal */
 138                                 value = db_get_value(addr, size, TRUE);
 139                                 addr += size;
 140                                 db_printf("%-*ld", width, (long)value);
 141                                 break;
 142                             case 'u':   /* unsigned decimal */
 143                                 value = db_get_value(addr, size, FALSE);
 144                                 addr += size;
 145                                 db_printf("%-*lu", width, (long)value);
 146                                 break;
 147                             case 'o':   /* unsigned octal */
 148                                 value = db_get_value(addr, size, FALSE);
 149                                 addr += size;
 150                                 db_printf("%-*lo", width, (long)value);
 151                                 break;
 152                             case 'c':   /* character */
 153                                 value = db_get_value(addr, 1, FALSE);
 154                                 addr += 1;
 155                                 if (value >= ' ' && value <= '~')
 156                                     db_printf("%c", (int)value);
 157                                 else
 158                                     db_printf("\\%03o", (int)value);
 159                                 break;
 160                             case 's':   /* null-terminated string */
 161                                 for (;;) {
 162                                     value = db_get_value(addr, 1, FALSE);
 163                                     addr += 1;
 164                                     if (value == 0)
 165                                         break;
 166                                     if (value >= ' ' && value <= '~')
 167                                         db_printf("%c", (int)value);
 168                                     else
 169                                         db_printf("\\%03o", (int)value);
 170                                 }
 171                                 break;
 172                             case 'i':   /* instruction */
 173                                 addr = db_disasm(addr, FALSE, NULL);
 174                                 break;
 175                             case 'I':   /* instruction, alternate form */
 176                                 addr = db_disasm(addr, TRUE, NULL);
 177                                 break;
 178                             default:
 179                                 break;
 180                         }
 181                         if (db_print_position() != 0)
 182                             db_end_line(1);
 183                         break;
 184                 }
 185             }
 186         }
 187         db_next = addr;
 188 }
 189
 190 /*
 191  * Print value.
 192  */
 193 static char     db_print_format = 'x';
 194
 195 /*ARGSUSED*/
 196 void
 197 db_print_cmd(db_expr_t addr, boolean_t have_addr, db_expr_t count, char *modif)
 198 {
 199         db_expr_t       value;
 200
 201         if (modif[0] != '\0')
 202             db_print_format = modif[0];
 203
 204         switch (db_print_format) {
 205             case 'a':
 206                 db_printsym((db_addr_t)addr, DB_STGY_ANY);
 207                 break;
 208             case 'r':
 209                 db_printf("%+11lr", (long)addr);
 210                 break;
 211             case 'x':
 212                 db_printf("%8lx", (unsigned long)addr);
 213                 break;
 214             case 'z':
 215                 {
 216                     char tbuf[24];
 217
 218                     db_format_hex(tbuf, 24, addr, FALSE);
 219                     db_printf("%8s", tbuf);
 220                     break;
 221                 }
 222             case 'd':
 223                 db_printf("%11ld", (long)addr);
 224                 break;
 225             case 'u':
 226                 db_printf("%11lu", (unsigned long)addr);
 227                 break;
 228             case 'o':
 229                 db_printf("%16lo", (unsigned long)addr);
 230                 break;
 231             case 'c':
 232                 value = addr & 0xFF;
 233                 if (value >= ' ' && value <= '~')
 234                     db_printf("%c", (int)value);
 235                 else
 236                     db_printf("\\%03o", (int)value);
 237                 break;
 238         }
 239         db_printf("\n");
 240 }
 241
 242 void
 243 db_print_loc_and_inst(db_addr_t loc, db_regs_t *regs)
 244 {
 245         db_printsym(loc, DB_STGY_PROC);
 246         db_printf(":\t");
 247         db_disasm(loc, TRUE, regs);
 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, boolean_t dummy2, 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
 319 static void
 320 db_search(db_addr_t addr, int size, db_expr_t value, db_expr_t mask,
 321           unsigned int count)
 322 {
 323         while (count-- != 0) {
 324                 db_prev = addr;
 325                 if ((db_get_value(addr, size, FALSE) & mask) == value)
 326                         break;
 327                 addr += size;
 328         }
 329         db_next = addr;
 330 }