2 * Mach Operating System
3 * Copyright (c) 1991,1990 Carnegie Mellon University
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7 * documentation is hereby granted, provided that both the copyright
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19 * School of Computer Science
20 * Carnegie Mellon University
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23 * any improvements or extensions that they make and grant Carnegie the
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26 * $FreeBSD: src/sys/ddb/db_output.c,v 1.26 1999/08/28 00:41:09 peter Exp $
30 * Author: David B. Golub, Carnegie Mellon University
35 * Printf and character output for debugger.
38 #include <sys/param.h>
39 #include <sys/systm.h>
41 #include <sys/ctype.h>
42 #include <sys/thread2.h>
43 #include <sys/spinlock2.h>
45 #include <machine/stdarg.h>
48 #include <ddb/db_output.h>
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.
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
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 */
68 static void db_putchar (int c, void *arg);
71 * Force pending whitespace.
74 db_force_whitespace(void)
76 int last_print, next_tab;
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!!! */
92 db_last_non_space = db_output_position;
96 * Output character. Buffer whitespace.
99 * arg: character to output
102 db_putchar(int c, void *arg)
105 * If not in the debugger, output data to both the console and
106 * the message buffer.
109 if (c == '\r' || c == '\n' || c == '\t' ||
117 if (c == '\r' || c == '\n')
118 db_check_interrupt();
124 if (c > ' ' && c <= '~') {
126 * Printing character.
127 * If we have spaces to print, print them first.
128 * Use tabs if possible.
130 db_force_whitespace();
132 db_output_position++;
133 db_last_non_space = db_output_position;
135 else if (c == '\n') {
138 db_output_position = 0;
139 db_last_non_space = 0;
140 db_check_interrupt();
142 else if (c == '\r') {
145 db_output_position = 0;
146 db_last_non_space = 0;
147 db_check_interrupt();
149 else if (c == '\t') {
150 /* assume tabs every 8 positions */
151 db_output_position = NEXT_TAB(db_output_position);
155 db_output_position++;
157 else if (c == '\007') {
161 /* other characters are assumed non-printing */
166 * Return output position
169 db_print_position(void)
171 return (db_output_position);
177 * NOTE: We bypass subr_prf's cons_spin here by using our own putchar
181 db_printf(const char *fmt, ...)
185 __va_start(listp, fmt);
186 kvcprintf (fmt, db_putchar, NULL, listp);
192 db_vprintf(const char *fmt, __va_list va)
194 kvcprintf (fmt, db_putchar, NULL, va);
201 db_iprintf(const char *fmt,...)
206 for (i = db_indent; i >= 8; i -= 8)
210 __va_start(listp, fmt);
211 kvcprintf (fmt, db_putchar, NULL, listp);
216 * End line if too long.
219 db_end_line(int field_width)
221 if (db_output_position + field_width > db_max_width)
235 db_printf("--More--");
239 * A whole screenfull or just one line?
242 case '\n': /* just one line */
246 *nl = 0; /* another screenfull */
257 * Replacement for old '%r' kprintf format.
260 db_format_radix(char *buf, size_t bufsiz, quad_t val, int altflag)
264 if (db_radix == 16) {
265 db_format_hex(buf, bufsiz, val, altflag);
270 fmt = altflag ? "-%#qo" : "-%qo";
272 fmt = altflag ? "-%#qu" : "-%qu";
279 ksnprintf(buf, bufsiz, fmt, val);
283 * Replacement for old '%z' kprintf format.
286 db_format_hex(char *buf, size_t bufsiz, quad_t val, int altflag)
288 /* Only use alternate form if val is nonzero. */
289 const char *fmt = (altflag && val) ? "-%#qx" : "-%qx";
296 ksnprintf(buf, bufsiz, fmt, val);
299 /* #define TEMPORARY_DEBUGGING */
300 #ifdef TEMPORARY_DEBUGGING
303 * Temporary Debugging, only turned on manually by kernel hackers trying
304 * to debug extremely low level code. Adjust PCHAR_ as required.
306 static void PCHAR_(int, void * __unused);
309 kprintf0(const char *fmt, ...)
314 kvcprintf(fmt, PCHAR_, NULL, ap);
319 PCHAR_(int c, void *dummy __unused)
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;
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 */
340 for (wait = COMC_TXWAIT; wait > 0; wait--) {
341 if (inb(COMPORT + com_lsr) & LSR_TXRDY) {
342 outb(COMPORT + com_data, (u_char)c);