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/param.h>
34 #include <sys/systm.h>
35
36 #include <ddb/ddb.h>
37
38 #include <ddb/db_lex.h>
39 #include <ddb/db_output.h>
40 #include <ddb/db_command.h>
41 #include <ddb/db_sym.h>
42 #include <ddb/db_access.h>
43
44 static char db_examine_format[TOK_STRING_SIZE] = "x";
45
46 static void db_examine(db_addr_t, char *, int);
47 static void db_search(db_addr_t, int, db_expr_t, db_expr_t, u_int);
48
49 /*
50 * Examine (print) data.
51 */
52 /*ARGSUSED*/
53 void
db_examine_cmd(db_expr_t addr,bool have_addr,db_expr_t count,char * modif)54 db_examine_cmd(db_expr_t addr, bool have_addr, db_expr_t count, char *modif)
55 {
56 if (modif[0] != '\0')
57 db_strcpy(db_examine_format, modif);
58
59 if (count == -1)
60 count = 1;
61
62 db_examine((db_addr_t) addr, db_examine_format, count);
63 }
64
65 static void
db_examine(db_addr_t addr,char * fmt,int count)66 db_examine(db_addr_t addr, char *fmt, int count)
67 {
68 int c;
69 db_expr_t value;
70 int size;
71 int width;
72 char * fp;
73
74 while (--count >= 0 && !db_pager_quit) {
75 fp = fmt;
76 size = 4;
77 while ((c = *fp++) != 0) {
78 switch (c) {
79 case 'b':
80 size = 1;
81 break;
82 case 'h':
83 size = 2;
84 break;
85 case 'l':
86 size = 4;
87 break;
88 case 'g':
89 size = 8;
90 break;
91 case 'a': /* address */
92 size = sizeof(void *);
93 /* always forces a new line */
94 if (db_print_position() != 0)
95 db_printf("\n");
96 db_prev = addr;
97 db_printsym(addr, DB_STGY_ANY);
98 db_printf(":\t");
99 break;
100 default:
101 if (db_print_position() == 0) {
102 /* Print the address. */
103 db_printsym(addr, DB_STGY_ANY);
104 db_printf(":\t");
105 db_prev = addr;
106 }
107
108 width = size * 4;
109 switch (c) {
110 case 'r': /* signed, current radix */
111 value = db_get_value(addr, size, true);
112 addr += size;
113 db_printf("%+-*lr", width, (long)value);
114 break;
115 case 'x': /* unsigned hex */
116 value = db_get_value(addr, size, false);
117 addr += size;
118 db_printf("%-*lx", width, (long)value);
119 break;
120 case 'z': /* signed hex */
121 value = db_get_value(addr, size, true);
122 addr += size;
123 db_printf("%-*ly", width, (long)value);
124 break;
125 case 'd': /* signed decimal */
126 value = db_get_value(addr, size, true);
127 addr += size;
128 db_printf("%-*ld", width, (long)value);
129 break;
130 case 'u': /* unsigned decimal */
131 value = db_get_value(addr, size, false);
132 addr += size;
133 db_printf("%-*lu", width, (long)value);
134 break;
135 case 'o': /* unsigned octal */
136 value = db_get_value(addr, size, false);
137 addr += size;
138 db_printf("%-*lo", width, (long)value);
139 break;
140 case 'c': /* character */
141 value = db_get_value(addr, 1, false);
142 addr += 1;
143 if (value >= ' ' && value <= '~')
144 db_printf("%c", (int)value);
145 else
146 db_printf("\\%03o", (int)value);
147 break;
148 case 's': /* null-terminated string */
149 for (;;) {
150 value = db_get_value(addr, 1, false);
151 addr += 1;
152 if (value == 0)
153 break;
154 if (value >= ' ' && value <= '~')
155 db_printf("%c", (int)value);
156 else
157 db_printf("\\%03o", (int)value);
158 }
159 break;
160 case 'S': /* symbol */
161 value = db_get_value(addr, sizeof(void *),
162 false);
163 addr += sizeof(void *);
164 db_printsym(value, DB_STGY_ANY);
165 break;
166 case 'i': /* instruction */
167 addr = db_disasm(addr, false);
168 break;
169 case 'I': /* instruction, alternate form */
170 addr = db_disasm(addr, true);
171 break;
172 default:
173 break;
174 }
175 if (db_print_position() != 0)
176 db_end_line(1);
177 break;
178 }
179 }
180 }
181 db_next = addr;
182 }
183
184 /*
185 * Print value.
186 */
187 static char db_print_format = 'x';
188
189 /*ARGSUSED*/
190 void
db_print_cmd(db_expr_t addr,bool have_addr,db_expr_t count,char * modif)191 db_print_cmd(db_expr_t addr, bool have_addr, db_expr_t count, char *modif)
192 {
193 db_expr_t value;
194
195 if (modif[0] != '\0')
196 db_print_format = modif[0];
197
198 switch (db_print_format) {
199 case 'a':
200 db_printsym((db_addr_t)addr, DB_STGY_ANY);
201 break;
202 case 'r':
203 db_printf("%+11lr", (long)addr);
204 break;
205 case 'x':
206 db_printf("%8lx", (unsigned long)addr);
207 break;
208 case 'z':
209 db_printf("%8ly", (long)addr);
210 break;
211 case 'd':
212 db_printf("%11ld", (long)addr);
213 break;
214 case 'u':
215 db_printf("%11lu", (unsigned long)addr);
216 break;
217 case 'o':
218 db_printf("%16lo", (unsigned long)addr);
219 break;
220 case 'c':
221 value = addr & 0xFF;
222 if (value >= ' ' && value <= '~')
223 db_printf("%c", (int)value);
224 else
225 db_printf("\\%03o", (int)value);
226 break;
227 default:
228 db_print_format = 'x';
229 db_error("Syntax error: unsupported print modifier\n");
230 /*NOTREACHED*/
231 }
232 db_printf("\n");
233 }
234
235 void
db_print_loc_and_inst(db_addr_t loc)236 db_print_loc_and_inst(db_addr_t loc)
237 {
238 db_expr_t off;
239
240 db_printsym(loc, DB_STGY_PROC);
241 if (db_search_symbol(loc, DB_STGY_PROC, &off) != C_DB_SYM_NULL) {
242 db_printf(":\t");
243 (void)db_disasm(loc, false);
244 }
245 }
246
247 /*
248 * Search for a value in memory.
249 * Syntax: search [/bhl] addr value [mask] [,count]
250 */
251 void
db_search_cmd(db_expr_t dummy1,bool dummy2,db_expr_t dummy3,char * dummy4)252 db_search_cmd(db_expr_t dummy1, bool dummy2, db_expr_t dummy3, char *dummy4)
253 {
254 int t;
255 db_addr_t addr;
256 int size;
257 db_expr_t value;
258 db_expr_t mask;
259 db_expr_t count;
260
261 t = db_read_token();
262 if (t == tSLASH) {
263 t = db_read_token();
264 if (t != tIDENT) {
265 bad_modifier:
266 db_printf("Bad modifier\n");
267 db_flush_lex();
268 return;
269 }
270
271 if (!strcmp(db_tok_string, "b"))
272 size = 1;
273 else if (!strcmp(db_tok_string, "h"))
274 size = 2;
275 else if (!strcmp(db_tok_string, "l"))
276 size = 4;
277 else
278 goto bad_modifier;
279 } else {
280 db_unread_token(t);
281 size = 4;
282 }
283
284 if (!db_expression((db_expr_t *)&addr)) {
285 db_printf("Address missing\n");
286 db_flush_lex();
287 return;
288 }
289
290 if (!db_expression(&value)) {
291 db_printf("Value missing\n");
292 db_flush_lex();
293 return;
294 }
295
296 if (!db_expression(&mask))
297 mask = 0xffffffffUL;
298
299 t = db_read_token();
300 if (t == tCOMMA) {
301 if (!db_expression(&count)) {
302 db_printf("Count missing\n");
303 db_flush_lex();
304 return;
305 }
306 } else {
307 db_unread_token(t);
308 count = -1; /* effectively forever */
309 }
310 db_skip_to_eol();
311
312 db_search(addr, size, value, mask, count);
313 }
314
315 static void
db_search(db_addr_t addr,int size,db_expr_t value,db_expr_t mask,unsigned int count)316 db_search(db_addr_t addr, int size, db_expr_t value, db_expr_t mask,
317 unsigned int count)
318 {
319 while (count-- != 0) {
320 db_prev = addr;
321 if ((db_get_value(addr, size, false) & mask) == value)
322 break;
323 addr += size;
324 }
325 db_next = addr;
326 }
327