1 /*        $NetBSD: db_write_cmd.c,v 1.28 2019/02/03 03:19:26 mrg Exp $          */
2 
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 "AS IS"
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  *        Author: David B. Golub,  Carnegie Mellon University
29  *        Date:     7/90
30  */
31 
32 #include <sys/cdefs.h>
33 __KERNEL_RCSID(0, "$NetBSD: db_write_cmd.c,v 1.28 2019/02/03 03:19:26 mrg Exp $");
34 
35 #include <sys/param.h>
36 #include <sys/proc.h>
37 
38 #include <ddb/ddb.h>
39 
40 /*
41  * Write to file.
42  */
43 /*ARGSUSED*/
44 void
db_write_cmd(db_expr_t address,bool have_addr,db_expr_t count,const char * modif)45 db_write_cmd(db_expr_t address, bool have_addr,
46     db_expr_t count, const char *modif)
47 {
48           db_addr_t addr;
49           db_expr_t old_value;
50           db_expr_t new_value;
51           int                 size;
52           bool                wrote_one;
53           bool                show_old_val;
54 
55           addr = (db_addr_t) address;
56           wrote_one = false;
57           show_old_val = islower((unsigned char)modif[0]);
58 
59           switch (tolower((unsigned char)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           case 'q':
71                     if (sizeof(db_expr_t) != sizeof(uint64_t)) {
72                               size = -1;
73                               db_error("q not supported\n");
74                               /*NOTREACHED*/
75                     }
76                     /* FALLTHROUGH */
77           case 'L':
78                     size = sizeof(db_expr_t);
79                     break;
80           default:
81                     size = -1;
82                     db_error("Unknown size\n");
83                     /*NOTREACHED*/
84           }
85 
86           while (db_expression(&new_value)) {
87                     db_printsym(addr, DB_STGY_ANY, db_printf);
88                     if (show_old_val) {
89                               old_value = db_get_value(addr, size, false);
90                               db_printf("\t\t%s = ", db_num_to_str(old_value));
91                               db_printf("%s\n", db_num_to_str(new_value));
92                     }
93                     else
94                               db_printf("\t\t= %s\n", db_num_to_str(new_value));
95                     db_put_value(addr, size, new_value);
96                     addr += size;
97 
98                     wrote_one = true;
99           }
100 
101           if (!wrote_one) {
102                     db_error("Nothing written.\n");
103                     /*NOTREACHED*/
104           }
105 
106           db_next = addr;
107           db_prev = addr - size;
108 
109           db_skip_to_eol();
110 }
111