db_write_cmd.c

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    1 /*-
    2  * SPDX-License-Identifier: MIT-CMU
    3  *
    4  * Mach Operating System
    5  * Copyright (c) 1991,1990 Carnegie Mellon University
    6  * All Rights Reserved.
    7  *
    8  * Permission to use, copy, modify and distribute this software and its
    9  * documentation is hereby granted, provided that both the copyright
   10  * notice and this permission notice appear in all copies of the
   11  * software, derivative works or modified versions, and any portions
   12  * thereof, and that both notices appear in supporting documentation.
   13  *
   14  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS
   15  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
   16  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
   17  *
   18  * Carnegie Mellon requests users of this software to return to
   19  *
   20  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
   21  *  School of Computer Science
   22  *  Carnegie Mellon University
   23  *  Pittsburgh PA 15213-3890
   24  *
   25  * any improvements or extensions that they make and grant Carnegie the
   26  * rights to redistribute these changes.
   27  */
   28 /*
   29  *      Author: David B. Golub,  Carnegie Mellon University
   30  *      Date:   7/90
   31  */
   32 
   33 #include <sys/cdefs.h>
   34 __FBSDID("$FreeBSD$");
   35 
   36 #include <sys/param.h>
   37 
   38 #include <ddb/ddb.h>
   39 #include <ddb/db_access.h>
   40 #include <ddb/db_command.h>
   41 #include <ddb/db_sym.h>
   42 
   43 /*
   44  * Write to file.
   45  */
   46 /*ARGSUSED*/
   47 void
   48 db_write_cmd(db_expr_t address, bool have_addr, db_expr_t count,
   49     char * modif)
   50 {
   51         db_addr_t       addr;
   52         db_expr_t       old_value;
   53         db_expr_t       new_value;
   54         int             size;
   55         bool            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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FreeBSD/Linux Kernel Cross Reference sys/ddb/db_write_cmd.c

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