The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/ddb/db_examine.c

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    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: releng/5.2/sys/ddb/db_examine.c 116176 2003-06-10 22:09:23Z obrien $");
   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(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 
   70 static void
   71 db_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();
  180                         break;
  181                 }
  182             }
  183         }
  184         db_next = addr;
  185 }
  186 
  187 /*
  188  * Print value.
  189  */
  190 static char     db_print_format = 'x';
  191 
  192 /*ARGSUSED*/
  193 void
  194 db_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 
  238 void
  239 db_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  */
  251 void
  252 db_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 
  319 static void
  320 db_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 }

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