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_write_cmd.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("$FreeBSD$");
   33 
   34 #include <sys/param.h>
   35 
   36 #include <ddb/ddb.h>
   37 #include <ddb/db_access.h>
   38 #include <ddb/db_command.h>
   39 #include <ddb/db_sym.h>
   40 
   41 /*
   42  * Write to file.
   43  */
   44 /*ARGSUSED*/
   45 void
   46 db_write_cmd(db_expr_t address, boolean_t have_addr, db_expr_t count,
   47     char * modif)
   48 {
   49         register
   50         db_addr_t       addr;
   51         register
   52         db_expr_t       old_value;
   53         db_expr_t       new_value;
   54         register int    size;
   55         boolean_t       wrote_one = FALSE;
   56 
   57         addr = (db_addr_t) address;
   58 
   59         switch (modif[0]) {
   60             case 'b':
   61                 size = 1;
   62                 break;
   63             case 'h':
   64                 size = 2;
   65                 break;
   66             case 'l':
   67             case '\0':
   68                 size = 4;
   69                 break;
   70             default:
   71                 db_error("Unknown size\n");
   72                 return;
   73         }
   74 
   75         while (db_expression(&new_value)) {
   76             old_value = db_get_value(addr, size, FALSE);
   77             db_printsym(addr, DB_STGY_ANY);
   78             db_printf("\t\t%#8lr\t=\t%#8lr\n", (long)old_value,(long)new_value);
   79             db_put_value(addr, size, new_value);
   80             addr += size;
   81 
   82             wrote_one = TRUE;
   83         }
   84 
   85         if (!wrote_one)
   86             db_error("Nothing written.\n");
   87 
   88         db_next = addr;
   89         db_prev = addr - size;
   90 
   91         db_skip_to_eol();
   92 }
   93 

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