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: releng/11.0/sys/ddb/db_write_cmd.c 283315 2015-05-23 14:59:27Z pfg $");
   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, bool have_addr, db_expr_t count,
   47     char * modif)
   48 {
   49         db_addr_t       addr;
   50         db_expr_t       old_value;
   51         db_expr_t       new_value;
   52         int             size;
   53         bool            wrote_one = false;
   54 
   55         addr = (db_addr_t) address;
   56 
   57         switch (modif[0]) {
   58             case 'b':
   59                 size = 1;
   60                 break;
   61             case 'h':
   62                 size = 2;
   63                 break;
   64             case 'l':
   65             case '\0':
   66                 size = 4;
   67                 break;
   68             default:
   69                 db_error("Unknown size\n");
   70                 return;
   71         }
   72 
   73         while (db_expression(&new_value)) {
   74             old_value = db_get_value(addr, size, false);
   75             db_printsym(addr, DB_STGY_ANY);
   76             db_printf("\t\t%#8lr\t=\t%#8lr\n", (long)old_value,(long)new_value);
   77             db_put_value(addr, size, new_value);
   78             addr += size;
   79 
   80             wrote_one = true;
   81         }
   82 
   83         if (!wrote_one)
   84             db_error("Nothing written.\n");
   85 
   86         db_next = addr;
   87         db_prev = addr - size;
   88 
   89         db_skip_to_eol();
   90 }
   91 

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