Home | History | Annotate | Line # | Download | only in ddb 
      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 (at) 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
     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