1 /*
2 * Mach Operating System
3 * Copyright (c) 1991,1990 Carnegie Mellon University
4 * All Rights Reserved.
5 *
6 * Permission to use, copy, modify and distribute this software and its
7 * documentation is hereby granted, provided that both the copyright
8 * notice and this permission notice appear in all copies of the
9 * software, derivative works or modified versions, and any portions
10 * thereof, and that both notices appear in supporting documentation.
11 *
12 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS
13 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
14 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
15 *
16 * Carnegie Mellon requests users of this software to return to
17 *
18 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
19 * School of Computer Science
20 * Carnegie Mellon University
21 * Pittsburgh PA 15213-3890
22 *
23 * any improvements or extensions that they make and grant Carnegie the
24 * rights to redistribute these changes.
25 *
26 * $FreeBSD: src/sys/ddb/db_output.c,v 1.26 1999/08/28 00:41:09 peter Exp $
27 */
28
29 /*
30 * Author: David B. Golub, Carnegie Mellon University
31 * Date: 7/90
32 */
33
34 /*
35 * Printf and character output for debugger.
36 */
37
38 #include <sys/param.h>
39 #include <sys/systm.h>
40 #include <sys/cons.h>
41 #include <sys/ctype.h>
42 #include <sys/thread2.h>
43 #include <sys/spinlock2.h>
44
45 #include <machine/stdarg.h>
46
47 #include <ddb/ddb.h>
48 #include <ddb/db_output.h>
49
50 /*
51 * Character output - tracks position in line.
52 * To do this correctly, we should know how wide
53 * the output device is - then we could zero
54 * the line position when the output device wraps
55 * around to the start of the next line.
56 *
57 * Instead, we count the number of spaces printed
58 * since the last printing character so that we
59 * don't print trailing spaces. This avoids most
60 * of the wraparounds.
61 */
62 static int db_output_position = 0; /* output column */
63 static int db_last_non_space = 0; /* last non-space character */
64 db_expr_t db_tab_stop_width = 8; /* how wide are tab stops? */
65 #define NEXT_TAB(i) rounddown((i) + db_tab_stop_width, db_tab_stop_width)
66 db_expr_t db_max_width = 79; /* output line width */
67
68 static void db_putchar (int c, void *arg);
69
70 /*
71 * Force pending whitespace.
72 */
73 void
db_force_whitespace(void)74 db_force_whitespace(void)
75 {
76 int last_print, next_tab;
77
78 last_print = db_last_non_space;
79 while (last_print < db_output_position) {
80 next_tab = NEXT_TAB(last_print);
81 if (next_tab <= db_output_position) {
82 while (last_print < next_tab) { /* DON'T send a tab!!! */
83 cnputc(' ');
84 last_print++;
85 }
86 }
87 else {
88 cnputc(' ');
89 last_print++;
90 }
91 }
92 db_last_non_space = db_output_position;
93 }
94
95 /*
96 * Output character. Buffer whitespace.
97 *
98 * Parameters:
99 * arg: character to output
100 */
101 static void
db_putchar(int c,void * arg)102 db_putchar(int c, void *arg)
103 {
104 /*
105 * If not in the debugger, output data to both the console and
106 * the message buffer.
107 */
108 if (!db_active) {
109 if (c == '\r' || c == '\n' || c == '\t' ||
110 isprint(c)) {
111 kprintf("%c", c);
112 } else {
113 kprintf("?");
114 }
115 if (!db_active)
116 return;
117 if (c == '\r' || c == '\n')
118 db_check_interrupt();
119 return;
120 }
121
122 crit_enter_hard();
123
124 if (c > ' ' && c <= '~') {
125 /*
126 * Printing character.
127 * If we have spaces to print, print them first.
128 * Use tabs if possible.
129 */
130 db_force_whitespace();
131 cnputc(c);
132 db_output_position++;
133 db_last_non_space = db_output_position;
134 }
135 else if (c == '\n') {
136 /* Newline */
137 cnputc(c);
138 db_output_position = 0;
139 db_last_non_space = 0;
140 db_check_interrupt();
141 }
142 else if (c == '\r') {
143 /* Return */
144 cnputc(c);
145 db_output_position = 0;
146 db_last_non_space = 0;
147 db_check_interrupt();
148 }
149 else if (c == '\t') {
150 /* assume tabs every 8 positions */
151 db_output_position = NEXT_TAB(db_output_position);
152 }
153 else if (c == ' ') {
154 /* space */
155 db_output_position++;
156 }
157 else if (c == '\007') {
158 /* bell */
159 cnputc(c);
160 }
161 /* other characters are assumed non-printing */
162 crit_exit_hard();
163 }
164
165 /*
166 * Return output position
167 */
168 int
db_print_position(void)169 db_print_position(void)
170 {
171 return (db_output_position);
172 }
173
174 /*
175 * Printing
176 *
177 * NOTE: We bypass subr_prf's cons_spin here by using our own putchar
178 * function.
179 */
180 void
db_printf(const char * fmt,...)181 db_printf(const char *fmt, ...)
182 {
183 __va_list listp;
184
185 __va_start(listp, fmt);
186 kvcprintf (fmt, db_putchar, NULL, listp);
187 __va_end(listp);
188 /* DELAY(100000);*/
189 }
190
191 void
db_vprintf(const char * fmt,__va_list va)192 db_vprintf(const char *fmt, __va_list va)
193 {
194 kvcprintf (fmt, db_putchar, NULL, va);
195 /* DELAY(100000);*/
196 }
197
198 int db_indent;
199
200 void
db_iprintf(const char * fmt,...)201 db_iprintf(const char *fmt,...)
202 {
203 int i;
204 __va_list listp;
205
206 for (i = db_indent; i >= 8; i -= 8)
207 db_printf("\t");
208 while (--i >= 0)
209 db_printf(" ");
210 __va_start(listp, fmt);
211 kvcprintf (fmt, db_putchar, NULL, listp);
212 __va_end(listp);
213 }
214
215 /*
216 * End line if too long.
217 */
218 void
db_end_line(int field_width)219 db_end_line(int field_width)
220 {
221 if (db_output_position + field_width > db_max_width)
222 db_printf("\n");
223 }
224
225 /*
226 * Simple pager
227 */
228 int
db_more(int * nl)229 db_more(int *nl)
230 {
231 ++*nl;
232 if (*nl == 20) {
233 int c;
234
235 db_printf("--More--");
236 c = cngetc();
237 db_printf("\r");
238 /*
239 * A whole screenfull or just one line?
240 */
241 switch (c) {
242 case '\n': /* just one line */
243 *nl = 19;
244 break;
245 case ' ':
246 *nl = 0; /* another screenfull */
247 break;
248 default: /* exit */
249 db_printf("\n");
250 return(-1);
251 }
252 }
253 return(0);
254 }
255
256 /*
257 * Replacement for old '%r' kprintf format.
258 */
259 void
db_format_radix(char * buf,size_t bufsiz,quad_t val,int altflag)260 db_format_radix(char *buf, size_t bufsiz, quad_t val, int altflag)
261 {
262 const char *fmt;
263
264 if (db_radix == 16) {
265 db_format_hex(buf, bufsiz, val, altflag);
266 return;
267 }
268
269 if (db_radix == 8)
270 fmt = altflag ? "-%#qo" : "-%qo";
271 else
272 fmt = altflag ? "-%#qu" : "-%qu";
273
274 if (val < 0)
275 val = -val;
276 else
277 ++fmt;
278
279 ksnprintf(buf, bufsiz, fmt, val);
280 }
281
282 /*
283 * Replacement for old '%z' kprintf format.
284 */
285 void
db_format_hex(char * buf,size_t bufsiz,quad_t val,int altflag)286 db_format_hex(char *buf, size_t bufsiz, quad_t val, int altflag)
287 {
288 /* Only use alternate form if val is nonzero. */
289 const char *fmt = (altflag && val) ? "-%#qx" : "-%qx";
290
291 if (val < 0)
292 val = -val;
293 else
294 ++fmt;
295
296 ksnprintf(buf, bufsiz, fmt, val);
297 }
298
299 /* #define TEMPORARY_DEBUGGING */
300 #ifdef TEMPORARY_DEBUGGING
301
302 /*
303 * Temporary Debugging, only turned on manually by kernel hackers trying
304 * to debug extremely low level code. Adjust PCHAR_ as required.
305 */
306 static void PCHAR_(int, void * __unused);
307
308 void
kprintf0(const char * fmt,...)309 kprintf0(const char *fmt, ...)
310 {
311 __va_list ap;
312
313 __va_start(ap, fmt);
314 kvcprintf(fmt, PCHAR_, NULL, ap);
315 __va_end(ap);
316 }
317
318 static void
PCHAR_(int c,void * dummy __unused)319 PCHAR_(int c, void *dummy __unused)
320 {
321 const int COMC_TXWAIT = 0x40000;
322 const int COMPORT = 0x2f8; /* 0x3f8 COM1, 0x2f8 COM2 */
323 const int LSR_TXRDY = 0x20;
324 const int BAUD = 115200;
325 const int com_lsr = 5;
326 const int com_data = 0;
327 int wait;
328 static int setbaud;
329
330 if (setbaud == 0) {
331 setbaud = 1;
332 outb(COMPORT+3, 0x83); /* DLAB + 8N1 */
333 outb(COMPORT+0, (115200 / BAUD) & 0xFF);
334 outb(COMPORT+1, (115200 / BAUD) >> 8);
335 outb(COMPORT+3, 0x03); /* 8N1 */
336 outb(COMPORT+4, 0x03); /* RTS+DTR */
337 outb(COMPORT+2, 0x01); /* FIFO_ENABLE */
338 }
339
340 for (wait = COMC_TXWAIT; wait > 0; wait--) {
341 if (inb(COMPORT + com_lsr) & LSR_TXRDY) {
342 outb(COMPORT + com_data, (u_char)c);
343 break;
344 }
345 }
346 }
347
348 #endif
349