1 /* $NetBSD: db_examine.c,v 1.40 2019/09/12 09:20:23 ryo 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_examine.c,v 1.40 2019/09/12 09:20:23 ryo Exp $");
34
35 #include <sys/param.h>
36 #include <sys/systm.h>
37 #include <sys/buf.h>
38 #include <sys/proc.h>
39
40 #include <ddb/ddb.h>
41
42 static char db_examine_format[TOK_STRING_SIZE] = "x";
43
44 static void db_examine(db_addr_t, char *, int);
45 static void db_search(db_addr_t, int, db_expr_t, db_expr_t, unsigned int);
46
47 /*
48 * Examine (print) data. Syntax is:
49 * x/[bhl][cdiorsuxz]*
50 * For example, the command:
51 * x/bxxxx
52 * should print:
53 * address: 01 23 45 67
54 */
55 /*ARGSUSED*/
56 void
db_examine_cmd(db_expr_t addr,bool have_addr,db_expr_t count,const char * modif)57 db_examine_cmd(db_expr_t addr, bool have_addr, db_expr_t count,
58 const char *modif)
59 {
60 if (modif[0] != '\0')
61 strlcpy(db_examine_format, modif, sizeof(db_examine_format));
62
63 if (count == -1)
64 count = 1;
65
66 db_examine((db_addr_t) addr, db_examine_format, count);
67 }
68
69 static void
db_examine(db_addr_t addr,char * fmt,int count)70 db_examine(db_addr_t addr, char *fmt, int count)
71 {
72 int i, c;
73 quad_t value;
74 int size;
75 int width;
76 int bytes;
77 char * fp;
78 char tbuf[24];
79
80 while (--count >= 0) {
81 fp = fmt;
82 size = 4;
83 width = 12;
84 while ((c = *fp++) != 0) {
85 if (db_print_position() == 0) {
86 /* Always print the address. */
87 db_printsym(addr, DB_STGY_ANY, db_printf);
88 db_printf(":\t");
89 db_prev = addr;
90 }
91 switch (c) {
92 case 'b': /* byte */
93 size = 1;
94 width = 4;
95 break;
96 case 'h': /* half-word */
97 size = 2;
98 width = 8;
99 break;
100 case 'l': /* long-word */
101 size = 4;
102 width = 12;
103 break;
104 case 'q': /* quad-word */
105 size = 8;
106 width = 24;
107 break;
108 case 'L': /* implementation maximum */
109 size = sizeof value;
110 width = 12 * (sizeof value / 4);
111 break;
112 case 'a': /* address */
113 db_printf("= 0x%lx\n", (long)addr);
114 break;
115 case 'p':
116 size = sizeof(void *);
117 value = db_get_value(addr, size, false);
118 addr += size;
119 db_printf("= 0x%lx ", (long)value);
120 db_printsym((db_addr_t)value, DB_STGY_ANY, db_printf);
121 db_printf("\n");
122 break;
123 case 'r': /* signed, current radix */
124 value = db_get_qvalue(addr, size, true);
125 addr += size;
126 db_format_radix(tbuf, 24, value, false);
127 db_printf("%-*s", width, tbuf);
128 break;
129 case 'x': /* unsigned hex */
130 value = db_get_qvalue(addr, size, false);
131 addr += size;
132 db_printf("%-*" PRIx64, width, value);
133 break;
134 case 'm': /* hex dump */
135 /*
136 * Print off in chunks of size. Try to print 16
137 * bytes at a time into 16/size columns. This
138 * loops modify's count extra times in order
139 * to get the nicely formatted lines.
140 */
141
142 bytes = 0;
143 do {
144 for (i = 0; i < size; i++) {
145 value =
146 #if BYTE_ORDER == LITTLE_ENDIAN
147 db_get_value(addr +
148 (bytes & ~(size - 1)) +
149 size - i - 1, 1, false);
150 #else
151 db_get_value(addr + bytes,
152 1, false);
153 #endif
154 db_printf(
155 "%02" PRIx64,
156 value);
157 bytes++;
158 if (!(bytes % size))
159 db_printf(" ");
160 }
161 } while ((bytes != 16) && count--);
162 /* True up the columns before continuing */
163 for (i = 4; i >= (bytes / 4); i--)
164 db_printf ("\t");
165 /* Print chars, use . for non-printable's. */
166 while (bytes--) {
167 value = db_get_value(addr, 1, false);
168 addr += 1;
169 if (value >= ' ' && value <= '~')
170 db_printf("%c", (char)value);
171 else
172 db_printf(".");
173 }
174 db_printf("\n");
175 break;
176 case 'z': /* signed hex */
177 value = db_get_qvalue(addr, size, true);
178 addr += size;
179 db_format_hex(tbuf, 24, value, false);
180 db_printf("%-*s", width, tbuf);
181 break;
182 case 'd': /* signed decimal */
183 value = db_get_qvalue(addr, size, true);
184 addr += size;
185 db_printf("%-*" PRId64, width, value);
186 break;
187 case 'u': /* unsigned decimal */
188 value = db_get_qvalue(addr, size, false);
189 addr += size;
190 db_printf("%-*" PRIu64, width, value);
191 break;
192 case 'o': /* unsigned octal */
193 value = db_get_qvalue(addr, size, false);
194 addr += size;
195 db_printf("%-*" PRIo64, width, value);
196 break;
197 case 'c': /* character */
198 value = db_get_value(addr, 1, false);
199 addr += 1;
200 if (value >= ' ' && value <= '~')
201 db_printf("%c", (char)value);
202 else
203 db_printf("\\%03o", (int)value);
204 break;
205 case 's': /* null-terminated string */
206 for (;;) {
207 value = db_get_value(addr, 1, false);
208 addr += 1;
209 if (value == 0)
210 break;
211 if (value >= ' ' && value <= '~')
212 db_printf("%c", (char)value);
213 else
214 db_printf("\\%03o", (int)value);
215 }
216 break;
217 case 'i': /* instruction */
218 addr = db_disasm(addr, false);
219 break;
220 case 'I': /* instruction, alternate form */
221 addr = db_disasm(addr, true);
222 break;
223 default:
224 break;
225 }
226 if (db_print_position() != 0)
227 db_end_line();
228 }
229 }
230 db_next = addr;
231 }
232
233 /*
234 * Print value.
235 */
236 static char db_print_format = 'x';
237
238 /*ARGSUSED*/
239 void
db_print_cmd(db_expr_t addr,bool have_addr,db_expr_t count,const char * modif)240 db_print_cmd(db_expr_t addr, bool have_addr, db_expr_t count,
241 const char *modif)
242 {
243 db_expr_t value;
244
245 if (modif[0] != '\0')
246 db_print_format = modif[0];
247
248 switch (db_print_format) {
249 case 'a':
250 db_printsym((db_addr_t)addr, DB_STGY_ANY, db_printf);
251 break;
252 case 'r':
253 {
254 char tbuf[24];
255
256 db_format_radix(tbuf, 24, addr, false);
257 db_printf("%11s", tbuf);
258 break;
259 }
260 case 'x':
261 db_printf("%16" DDB_EXPR_FMT "x", addr);
262 break;
263 case 'z':
264 {
265 char tbuf[24];
266
267 db_format_hex(tbuf, 24, addr, false);
268 db_printf("%8s", tbuf);
269 break;
270 }
271 case 'd':
272 db_printf("%11" DDB_EXPR_FMT "d", addr);
273 break;
274 case 'u':
275 db_printf("%11" DDB_EXPR_FMT "u", addr);
276 break;
277 case 'o':
278 db_printf("%15" DDB_EXPR_FMT "o", addr);
279 break;
280 case 'c':
281 value = addr & 0xFF;
282 if (value >= ' ' && value <= '~')
283 db_printf("%c", (char)value);
284 else
285 db_printf("\\%03o", (int)value);
286 break;
287 }
288 db_printf("\n");
289 }
290
291 void
db_print_loc_and_inst(db_addr_t loc)292 db_print_loc_and_inst(db_addr_t loc)
293 {
294
295 db_printsym(loc, DB_STGY_PROC, db_printf);
296 db_printf(":\t");
297 (void) db_disasm(loc, false);
298 }
299
300 /*
301 * Search for a value in memory.
302 * Syntax: search [/bhl] addr value [mask] [,count]
303 */
304 /*ARGSUSED*/
305 void
db_search_cmd(db_expr_t daddr,bool have_addr,db_expr_t dcount,const char * modif)306 db_search_cmd(db_expr_t daddr, bool have_addr,
307 db_expr_t dcount, const char *modif)
308 {
309 int t;
310 db_addr_t addr;
311 int size;
312 db_expr_t value;
313 db_expr_t mask;
314 db_expr_t count;
315
316 t = db_read_token();
317 if (t == tSLASH) {
318 t = db_read_token();
319 if (t != tIDENT) {
320 bad_modifier:
321 db_printf("Bad modifier\n");
322 db_flush_lex();
323 return;
324 }
325
326 if (!strcmp(db_tok_string, "b"))
327 size = 1;
328 else if (!strcmp(db_tok_string, "h"))
329 size = 2;
330 else if (!strcmp(db_tok_string, "l"))
331 size = 4;
332 else
333 goto bad_modifier;
334 } else {
335 db_unread_token(t);
336 size = 4;
337 }
338
339 if (!db_expression(&value)) {
340 db_printf("Address missing\n");
341 db_flush_lex();
342 return;
343 }
344 addr = (db_addr_t) value;
345
346 if (!db_expression(&value)) {
347 db_printf("Value missing\n");
348 db_flush_lex();
349 return;
350 }
351
352 if (!db_expression(&mask))
353 mask = (int) ~0;
354
355 t = db_read_token();
356 if (t == tCOMMA) {
357 if (!db_expression(&count)) {
358 db_printf("Count missing\n");
359 db_flush_lex();
360 return;
361 }
362 } else {
363 db_unread_token(t);
364 count = -1; /* effectively forever */
365 }
366 db_skip_to_eol();
367
368 db_search(addr, size, value, mask, count);
369 }
370
371 static void
db_search(db_addr_t addr,int size,db_expr_t value,db_expr_t mask,unsigned int count)372 db_search(db_addr_t addr, int size, db_expr_t value, db_expr_t mask,
373 unsigned int count)
374 {
375 while (count-- != 0) {
376 db_prev = addr;
377 if ((db_get_value(addr, size, false) & mask) == value)
378 break;
379 addr += size;
380 }
381 db_next = addr;
382 }
383