Loading...
1/*
2 * Kernel Debugger Architecture Independent Console I/O handler
3 *
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file "COPYING" in the main directory of this archive
6 * for more details.
7 *
8 * Copyright (c) 1999-2006 Silicon Graphics, Inc. All Rights Reserved.
9 * Copyright (c) 2009 Wind River Systems, Inc. All Rights Reserved.
10 */
11
12#include <linux/module.h>
13#include <linux/types.h>
14#include <linux/ctype.h>
15#include <linux/kernel.h>
16#include <linux/init.h>
17#include <linux/kdev_t.h>
18#include <linux/console.h>
19#include <linux/string.h>
20#include <linux/sched.h>
21#include <linux/smp.h>
22#include <linux/nmi.h>
23#include <linux/delay.h>
24#include <linux/kgdb.h>
25#include <linux/kdb.h>
26#include <linux/kallsyms.h>
27#include "kdb_private.h"
28
29#define CMD_BUFLEN 256
30char kdb_prompt_str[CMD_BUFLEN];
31
32int kdb_trap_printk;
33
34static int kgdb_transition_check(char *buffer)
35{
36 if (buffer[0] != '+' && buffer[0] != '$') {
37 KDB_STATE_SET(KGDB_TRANS);
38 kdb_printf("%s", buffer);
39 } else {
40 int slen = strlen(buffer);
41 if (slen > 3 && buffer[slen - 3] == '#') {
42 kdb_gdb_state_pass(buffer);
43 strcpy(buffer, "kgdb");
44 KDB_STATE_SET(DOING_KGDB);
45 return 1;
46 }
47 }
48 return 0;
49}
50
51static int kdb_read_get_key(char *buffer, size_t bufsize)
52{
53#define ESCAPE_UDELAY 1000
54#define ESCAPE_DELAY (2*1000000/ESCAPE_UDELAY) /* 2 seconds worth of udelays */
55 char escape_data[5]; /* longest vt100 escape sequence is 4 bytes */
56 char *ped = escape_data;
57 int escape_delay = 0;
58 get_char_func *f, *f_escape = NULL;
59 int key;
60
61 for (f = &kdb_poll_funcs[0]; ; ++f) {
62 if (*f == NULL) {
63 /* Reset NMI watchdog once per poll loop */
64 touch_nmi_watchdog();
65 f = &kdb_poll_funcs[0];
66 }
67 if (escape_delay == 2) {
68 *ped = '\0';
69 ped = escape_data;
70 --escape_delay;
71 }
72 if (escape_delay == 1) {
73 key = *ped++;
74 if (!*ped)
75 --escape_delay;
76 break;
77 }
78 key = (*f)();
79 if (key == -1) {
80 if (escape_delay) {
81 udelay(ESCAPE_UDELAY);
82 --escape_delay;
83 }
84 continue;
85 }
86 if (bufsize <= 2) {
87 if (key == '\r')
88 key = '\n';
89 *buffer++ = key;
90 *buffer = '\0';
91 return -1;
92 }
93 if (escape_delay == 0 && key == '\e') {
94 escape_delay = ESCAPE_DELAY;
95 ped = escape_data;
96 f_escape = f;
97 }
98 if (escape_delay) {
99 *ped++ = key;
100 if (f_escape != f) {
101 escape_delay = 2;
102 continue;
103 }
104 if (ped - escape_data == 1) {
105 /* \e */
106 continue;
107 } else if (ped - escape_data == 2) {
108 /* \e<something> */
109 if (key != '[')
110 escape_delay = 2;
111 continue;
112 } else if (ped - escape_data == 3) {
113 /* \e[<something> */
114 int mapkey = 0;
115 switch (key) {
116 case 'A': /* \e[A, up arrow */
117 mapkey = 16;
118 break;
119 case 'B': /* \e[B, down arrow */
120 mapkey = 14;
121 break;
122 case 'C': /* \e[C, right arrow */
123 mapkey = 6;
124 break;
125 case 'D': /* \e[D, left arrow */
126 mapkey = 2;
127 break;
128 case '1': /* dropthrough */
129 case '3': /* dropthrough */
130 /* \e[<1,3,4>], may be home, del, end */
131 case '4':
132 mapkey = -1;
133 break;
134 }
135 if (mapkey != -1) {
136 if (mapkey > 0) {
137 escape_data[0] = mapkey;
138 escape_data[1] = '\0';
139 }
140 escape_delay = 2;
141 }
142 continue;
143 } else if (ped - escape_data == 4) {
144 /* \e[<1,3,4><something> */
145 int mapkey = 0;
146 if (key == '~') {
147 switch (escape_data[2]) {
148 case '1': /* \e[1~, home */
149 mapkey = 1;
150 break;
151 case '3': /* \e[3~, del */
152 mapkey = 4;
153 break;
154 case '4': /* \e[4~, end */
155 mapkey = 5;
156 break;
157 }
158 }
159 if (mapkey > 0) {
160 escape_data[0] = mapkey;
161 escape_data[1] = '\0';
162 }
163 escape_delay = 2;
164 continue;
165 }
166 }
167 break; /* A key to process */
168 }
169 return key;
170}
171
172/*
173 * kdb_read
174 *
175 * This function reads a string of characters, terminated by
176 * a newline, or by reaching the end of the supplied buffer,
177 * from the current kernel debugger console device.
178 * Parameters:
179 * buffer - Address of character buffer to receive input characters.
180 * bufsize - size, in bytes, of the character buffer
181 * Returns:
182 * Returns a pointer to the buffer containing the received
183 * character string. This string will be terminated by a
184 * newline character.
185 * Locking:
186 * No locks are required to be held upon entry to this
187 * function. It is not reentrant - it relies on the fact
188 * that while kdb is running on only one "master debug" cpu.
189 * Remarks:
190 *
191 * The buffer size must be >= 2. A buffer size of 2 means that the caller only
192 * wants a single key.
193 *
194 * An escape key could be the start of a vt100 control sequence such as \e[D
195 * (left arrow) or it could be a character in its own right. The standard
196 * method for detecting the difference is to wait for 2 seconds to see if there
197 * are any other characters. kdb is complicated by the lack of a timer service
198 * (interrupts are off), by multiple input sources and by the need to sometimes
199 * return after just one key. Escape sequence processing has to be done as
200 * states in the polling loop.
201 */
202
203static char *kdb_read(char *buffer, size_t bufsize)
204{
205 char *cp = buffer;
206 char *bufend = buffer+bufsize-2; /* Reserve space for newline
207 * and null byte */
208 char *lastchar;
209 char *p_tmp;
210 char tmp;
211 static char tmpbuffer[CMD_BUFLEN];
212 int len = strlen(buffer);
213 int len_tmp;
214 int tab = 0;
215 int count;
216 int i;
217 int diag, dtab_count;
218 int key;
219
220
221 diag = kdbgetintenv("DTABCOUNT", &dtab_count);
222 if (diag)
223 dtab_count = 30;
224
225 if (len > 0) {
226 cp += len;
227 if (*(buffer+len-1) == '\n')
228 cp--;
229 }
230
231 lastchar = cp;
232 *cp = '\0';
233 kdb_printf("%s", buffer);
234poll_again:
235 key = kdb_read_get_key(buffer, bufsize);
236 if (key == -1)
237 return buffer;
238 if (key != 9)
239 tab = 0;
240 switch (key) {
241 case 8: /* backspace */
242 if (cp > buffer) {
243 if (cp < lastchar) {
244 memcpy(tmpbuffer, cp, lastchar - cp);
245 memcpy(cp-1, tmpbuffer, lastchar - cp);
246 }
247 *(--lastchar) = '\0';
248 --cp;
249 kdb_printf("\b%s \r", cp);
250 tmp = *cp;
251 *cp = '\0';
252 kdb_printf(kdb_prompt_str);
253 kdb_printf("%s", buffer);
254 *cp = tmp;
255 }
256 break;
257 case 13: /* enter */
258 *lastchar++ = '\n';
259 *lastchar++ = '\0';
260 if (!KDB_STATE(KGDB_TRANS)) {
261 KDB_STATE_SET(KGDB_TRANS);
262 kdb_printf("%s", buffer);
263 }
264 kdb_printf("\n");
265 return buffer;
266 case 4: /* Del */
267 if (cp < lastchar) {
268 memcpy(tmpbuffer, cp+1, lastchar - cp - 1);
269 memcpy(cp, tmpbuffer, lastchar - cp - 1);
270 *(--lastchar) = '\0';
271 kdb_printf("%s \r", cp);
272 tmp = *cp;
273 *cp = '\0';
274 kdb_printf(kdb_prompt_str);
275 kdb_printf("%s", buffer);
276 *cp = tmp;
277 }
278 break;
279 case 1: /* Home */
280 if (cp > buffer) {
281 kdb_printf("\r");
282 kdb_printf(kdb_prompt_str);
283 cp = buffer;
284 }
285 break;
286 case 5: /* End */
287 if (cp < lastchar) {
288 kdb_printf("%s", cp);
289 cp = lastchar;
290 }
291 break;
292 case 2: /* Left */
293 if (cp > buffer) {
294 kdb_printf("\b");
295 --cp;
296 }
297 break;
298 case 14: /* Down */
299 memset(tmpbuffer, ' ',
300 strlen(kdb_prompt_str) + (lastchar-buffer));
301 *(tmpbuffer+strlen(kdb_prompt_str) +
302 (lastchar-buffer)) = '\0';
303 kdb_printf("\r%s\r", tmpbuffer);
304 *lastchar = (char)key;
305 *(lastchar+1) = '\0';
306 return lastchar;
307 case 6: /* Right */
308 if (cp < lastchar) {
309 kdb_printf("%c", *cp);
310 ++cp;
311 }
312 break;
313 case 16: /* Up */
314 memset(tmpbuffer, ' ',
315 strlen(kdb_prompt_str) + (lastchar-buffer));
316 *(tmpbuffer+strlen(kdb_prompt_str) +
317 (lastchar-buffer)) = '\0';
318 kdb_printf("\r%s\r", tmpbuffer);
319 *lastchar = (char)key;
320 *(lastchar+1) = '\0';
321 return lastchar;
322 case 9: /* Tab */
323 if (tab < 2)
324 ++tab;
325 p_tmp = buffer;
326 while (*p_tmp == ' ')
327 p_tmp++;
328 if (p_tmp > cp)
329 break;
330 memcpy(tmpbuffer, p_tmp, cp-p_tmp);
331 *(tmpbuffer + (cp-p_tmp)) = '\0';
332 p_tmp = strrchr(tmpbuffer, ' ');
333 if (p_tmp)
334 ++p_tmp;
335 else
336 p_tmp = tmpbuffer;
337 len = strlen(p_tmp);
338 count = kallsyms_symbol_complete(p_tmp,
339 sizeof(tmpbuffer) -
340 (p_tmp - tmpbuffer));
341 if (tab == 2 && count > 0) {
342 kdb_printf("\n%d symbols are found.", count);
343 if (count > dtab_count) {
344 count = dtab_count;
345 kdb_printf(" But only first %d symbols will"
346 " be printed.\nYou can change the"
347 " environment variable DTABCOUNT.",
348 count);
349 }
350 kdb_printf("\n");
351 for (i = 0; i < count; i++) {
352 if (kallsyms_symbol_next(p_tmp, i) < 0)
353 break;
354 kdb_printf("%s ", p_tmp);
355 *(p_tmp + len) = '\0';
356 }
357 if (i >= dtab_count)
358 kdb_printf("...");
359 kdb_printf("\n");
360 kdb_printf(kdb_prompt_str);
361 kdb_printf("%s", buffer);
362 } else if (tab != 2 && count > 0) {
363 len_tmp = strlen(p_tmp);
364 strncpy(p_tmp+len_tmp, cp, lastchar-cp+1);
365 len_tmp = strlen(p_tmp);
366 strncpy(cp, p_tmp+len, len_tmp-len + 1);
367 len = len_tmp - len;
368 kdb_printf("%s", cp);
369 cp += len;
370 lastchar += len;
371 }
372 kdb_nextline = 1; /* reset output line number */
373 break;
374 default:
375 if (key >= 32 && lastchar < bufend) {
376 if (cp < lastchar) {
377 memcpy(tmpbuffer, cp, lastchar - cp);
378 memcpy(cp+1, tmpbuffer, lastchar - cp);
379 *++lastchar = '\0';
380 *cp = key;
381 kdb_printf("%s\r", cp);
382 ++cp;
383 tmp = *cp;
384 *cp = '\0';
385 kdb_printf(kdb_prompt_str);
386 kdb_printf("%s", buffer);
387 *cp = tmp;
388 } else {
389 *++lastchar = '\0';
390 *cp++ = key;
391 /* The kgdb transition check will hide
392 * printed characters if we think that
393 * kgdb is connecting, until the check
394 * fails */
395 if (!KDB_STATE(KGDB_TRANS)) {
396 if (kgdb_transition_check(buffer))
397 return buffer;
398 } else {
399 kdb_printf("%c", key);
400 }
401 }
402 /* Special escape to kgdb */
403 if (lastchar - buffer >= 5 &&
404 strcmp(lastchar - 5, "$?#3f") == 0) {
405 kdb_gdb_state_pass(lastchar - 5);
406 strcpy(buffer, "kgdb");
407 KDB_STATE_SET(DOING_KGDB);
408 return buffer;
409 }
410 if (lastchar - buffer >= 11 &&
411 strcmp(lastchar - 11, "$qSupported") == 0) {
412 kdb_gdb_state_pass(lastchar - 11);
413 strcpy(buffer, "kgdb");
414 KDB_STATE_SET(DOING_KGDB);
415 return buffer;
416 }
417 }
418 break;
419 }
420 goto poll_again;
421}
422
423/*
424 * kdb_getstr
425 *
426 * Print the prompt string and read a command from the
427 * input device.
428 *
429 * Parameters:
430 * buffer Address of buffer to receive command
431 * bufsize Size of buffer in bytes
432 * prompt Pointer to string to use as prompt string
433 * Returns:
434 * Pointer to command buffer.
435 * Locking:
436 * None.
437 * Remarks:
438 * For SMP kernels, the processor number will be
439 * substituted for %d, %x or %o in the prompt.
440 */
441
442char *kdb_getstr(char *buffer, size_t bufsize, char *prompt)
443{
444 if (prompt && kdb_prompt_str != prompt)
445 strncpy(kdb_prompt_str, prompt, CMD_BUFLEN);
446 kdb_printf(kdb_prompt_str);
447 kdb_nextline = 1; /* Prompt and input resets line number */
448 return kdb_read(buffer, bufsize);
449}
450
451/*
452 * kdb_input_flush
453 *
454 * Get rid of any buffered console input.
455 *
456 * Parameters:
457 * none
458 * Returns:
459 * nothing
460 * Locking:
461 * none
462 * Remarks:
463 * Call this function whenever you want to flush input. If there is any
464 * outstanding input, it ignores all characters until there has been no
465 * data for approximately 1ms.
466 */
467
468static void kdb_input_flush(void)
469{
470 get_char_func *f;
471 int res;
472 int flush_delay = 1;
473 while (flush_delay) {
474 flush_delay--;
475empty:
476 touch_nmi_watchdog();
477 for (f = &kdb_poll_funcs[0]; *f; ++f) {
478 res = (*f)();
479 if (res != -1) {
480 flush_delay = 1;
481 goto empty;
482 }
483 }
484 if (flush_delay)
485 mdelay(1);
486 }
487}
488
489/*
490 * kdb_printf
491 *
492 * Print a string to the output device(s).
493 *
494 * Parameters:
495 * printf-like format and optional args.
496 * Returns:
497 * 0
498 * Locking:
499 * None.
500 * Remarks:
501 * use 'kdbcons->write()' to avoid polluting 'log_buf' with
502 * kdb output.
503 *
504 * If the user is doing a cmd args | grep srch
505 * then kdb_grepping_flag is set.
506 * In that case we need to accumulate full lines (ending in \n) before
507 * searching for the pattern.
508 */
509
510static char kdb_buffer[256]; /* A bit too big to go on stack */
511static char *next_avail = kdb_buffer;
512static int size_avail;
513static int suspend_grep;
514
515/*
516 * search arg1 to see if it contains arg2
517 * (kdmain.c provides flags for ^pat and pat$)
518 *
519 * return 1 for found, 0 for not found
520 */
521static int kdb_search_string(char *searched, char *searchfor)
522{
523 char firstchar, *cp;
524 int len1, len2;
525
526 /* not counting the newline at the end of "searched" */
527 len1 = strlen(searched)-1;
528 len2 = strlen(searchfor);
529 if (len1 < len2)
530 return 0;
531 if (kdb_grep_leading && kdb_grep_trailing && len1 != len2)
532 return 0;
533 if (kdb_grep_leading) {
534 if (!strncmp(searched, searchfor, len2))
535 return 1;
536 } else if (kdb_grep_trailing) {
537 if (!strncmp(searched+len1-len2, searchfor, len2))
538 return 1;
539 } else {
540 firstchar = *searchfor;
541 cp = searched;
542 while ((cp = strchr(cp, firstchar))) {
543 if (!strncmp(cp, searchfor, len2))
544 return 1;
545 cp++;
546 }
547 }
548 return 0;
549}
550
551int vkdb_printf(const char *fmt, va_list ap)
552{
553 int diag;
554 int linecount;
555 int logging, saved_loglevel = 0;
556 int saved_trap_printk;
557 int got_printf_lock = 0;
558 int retlen = 0;
559 int fnd, len;
560 char *cp, *cp2, *cphold = NULL, replaced_byte = ' ';
561 char *moreprompt = "more> ";
562 struct console *c = console_drivers;
563 static DEFINE_SPINLOCK(kdb_printf_lock);
564 unsigned long uninitialized_var(flags);
565
566 preempt_disable();
567 saved_trap_printk = kdb_trap_printk;
568 kdb_trap_printk = 0;
569
570 /* Serialize kdb_printf if multiple cpus try to write at once.
571 * But if any cpu goes recursive in kdb, just print the output,
572 * even if it is interleaved with any other text.
573 */
574 if (!KDB_STATE(PRINTF_LOCK)) {
575 KDB_STATE_SET(PRINTF_LOCK);
576 spin_lock_irqsave(&kdb_printf_lock, flags);
577 got_printf_lock = 1;
578 atomic_inc(&kdb_event);
579 } else {
580 __acquire(kdb_printf_lock);
581 }
582
583 diag = kdbgetintenv("LINES", &linecount);
584 if (diag || linecount <= 1)
585 linecount = 24;
586
587 diag = kdbgetintenv("LOGGING", &logging);
588 if (diag)
589 logging = 0;
590
591 if (!kdb_grepping_flag || suspend_grep) {
592 /* normally, every vsnprintf starts a new buffer */
593 next_avail = kdb_buffer;
594 size_avail = sizeof(kdb_buffer);
595 }
596 vsnprintf(next_avail, size_avail, fmt, ap);
597
598 /*
599 * If kdb_parse() found that the command was cmd xxx | grep yyy
600 * then kdb_grepping_flag is set, and kdb_grep_string contains yyy
601 *
602 * Accumulate the print data up to a newline before searching it.
603 * (vsnprintf does null-terminate the string that it generates)
604 */
605
606 /* skip the search if prints are temporarily unconditional */
607 if (!suspend_grep && kdb_grepping_flag) {
608 cp = strchr(kdb_buffer, '\n');
609 if (!cp) {
610 /*
611 * Special cases that don't end with newlines
612 * but should be written without one:
613 * The "[nn]kdb> " prompt should
614 * appear at the front of the buffer.
615 *
616 * The "[nn]more " prompt should also be
617 * (MOREPROMPT -> moreprompt)
618 * written * but we print that ourselves,
619 * we set the suspend_grep flag to make
620 * it unconditional.
621 *
622 */
623 if (next_avail == kdb_buffer) {
624 /*
625 * these should occur after a newline,
626 * so they will be at the front of the
627 * buffer
628 */
629 cp2 = kdb_buffer;
630 len = strlen(kdb_prompt_str);
631 if (!strncmp(cp2, kdb_prompt_str, len)) {
632 /*
633 * We're about to start a new
634 * command, so we can go back
635 * to normal mode.
636 */
637 kdb_grepping_flag = 0;
638 goto kdb_printit;
639 }
640 }
641 /* no newline; don't search/write the buffer
642 until one is there */
643 len = strlen(kdb_buffer);
644 next_avail = kdb_buffer + len;
645 size_avail = sizeof(kdb_buffer) - len;
646 goto kdb_print_out;
647 }
648
649 /*
650 * The newline is present; print through it or discard
651 * it, depending on the results of the search.
652 */
653 cp++; /* to byte after the newline */
654 replaced_byte = *cp; /* remember what/where it was */
655 cphold = cp;
656 *cp = '\0'; /* end the string for our search */
657
658 /*
659 * We now have a newline at the end of the string
660 * Only continue with this output if it contains the
661 * search string.
662 */
663 fnd = kdb_search_string(kdb_buffer, kdb_grep_string);
664 if (!fnd) {
665 /*
666 * At this point the complete line at the start
667 * of kdb_buffer can be discarded, as it does
668 * not contain what the user is looking for.
669 * Shift the buffer left.
670 */
671 *cphold = replaced_byte;
672 strcpy(kdb_buffer, cphold);
673 len = strlen(kdb_buffer);
674 next_avail = kdb_buffer + len;
675 size_avail = sizeof(kdb_buffer) - len;
676 goto kdb_print_out;
677 }
678 /*
679 * at this point the string is a full line and
680 * should be printed, up to the null.
681 */
682 }
683kdb_printit:
684
685 /*
686 * Write to all consoles.
687 */
688 retlen = strlen(kdb_buffer);
689 if (!dbg_kdb_mode && kgdb_connected) {
690 gdbstub_msg_write(kdb_buffer, retlen);
691 } else {
692 if (dbg_io_ops && !dbg_io_ops->is_console) {
693 len = strlen(kdb_buffer);
694 cp = kdb_buffer;
695 while (len--) {
696 dbg_io_ops->write_char(*cp);
697 cp++;
698 }
699 }
700 while (c) {
701 c->write(c, kdb_buffer, retlen);
702 touch_nmi_watchdog();
703 c = c->next;
704 }
705 }
706 if (logging) {
707 saved_loglevel = console_loglevel;
708 console_loglevel = 0;
709 printk(KERN_INFO "%s", kdb_buffer);
710 }
711
712 if (KDB_STATE(PAGER) && strchr(kdb_buffer, '\n'))
713 kdb_nextline++;
714
715 /* check for having reached the LINES number of printed lines */
716 if (kdb_nextline == linecount) {
717 char buf1[16] = "";
718#if defined(CONFIG_SMP)
719 char buf2[32];
720#endif
721
722 /* Watch out for recursion here. Any routine that calls
723 * kdb_printf will come back through here. And kdb_read
724 * uses kdb_printf to echo on serial consoles ...
725 */
726 kdb_nextline = 1; /* In case of recursion */
727
728 /*
729 * Pause until cr.
730 */
731 moreprompt = kdbgetenv("MOREPROMPT");
732 if (moreprompt == NULL)
733 moreprompt = "more> ";
734
735#if defined(CONFIG_SMP)
736 if (strchr(moreprompt, '%')) {
737 sprintf(buf2, moreprompt, get_cpu());
738 put_cpu();
739 moreprompt = buf2;
740 }
741#endif
742
743 kdb_input_flush();
744 c = console_drivers;
745
746 if (dbg_io_ops && !dbg_io_ops->is_console) {
747 len = strlen(moreprompt);
748 cp = moreprompt;
749 while (len--) {
750 dbg_io_ops->write_char(*cp);
751 cp++;
752 }
753 }
754 while (c) {
755 c->write(c, moreprompt, strlen(moreprompt));
756 touch_nmi_watchdog();
757 c = c->next;
758 }
759
760 if (logging)
761 printk("%s", moreprompt);
762
763 kdb_read(buf1, 2); /* '2' indicates to return
764 * immediately after getting one key. */
765 kdb_nextline = 1; /* Really set output line 1 */
766
767 /* empty and reset the buffer: */
768 kdb_buffer[0] = '\0';
769 next_avail = kdb_buffer;
770 size_avail = sizeof(kdb_buffer);
771 if ((buf1[0] == 'q') || (buf1[0] == 'Q')) {
772 /* user hit q or Q */
773 KDB_FLAG_SET(CMD_INTERRUPT); /* command interrupted */
774 KDB_STATE_CLEAR(PAGER);
775 /* end of command output; back to normal mode */
776 kdb_grepping_flag = 0;
777 kdb_printf("\n");
778 } else if (buf1[0] == ' ') {
779 kdb_printf("\n");
780 suspend_grep = 1; /* for this recursion */
781 } else if (buf1[0] == '\n') {
782 kdb_nextline = linecount - 1;
783 kdb_printf("\r");
784 suspend_grep = 1; /* for this recursion */
785 } else if (buf1[0] && buf1[0] != '\n') {
786 /* user hit something other than enter */
787 suspend_grep = 1; /* for this recursion */
788 kdb_printf("\nOnly 'q' or 'Q' are processed at more "
789 "prompt, input ignored\n");
790 } else if (kdb_grepping_flag) {
791 /* user hit enter */
792 suspend_grep = 1; /* for this recursion */
793 kdb_printf("\n");
794 }
795 kdb_input_flush();
796 }
797
798 /*
799 * For grep searches, shift the printed string left.
800 * replaced_byte contains the character that was overwritten with
801 * the terminating null, and cphold points to the null.
802 * Then adjust the notion of available space in the buffer.
803 */
804 if (kdb_grepping_flag && !suspend_grep) {
805 *cphold = replaced_byte;
806 strcpy(kdb_buffer, cphold);
807 len = strlen(kdb_buffer);
808 next_avail = kdb_buffer + len;
809 size_avail = sizeof(kdb_buffer) - len;
810 }
811
812kdb_print_out:
813 suspend_grep = 0; /* end of what may have been a recursive call */
814 if (logging)
815 console_loglevel = saved_loglevel;
816 if (KDB_STATE(PRINTF_LOCK) && got_printf_lock) {
817 got_printf_lock = 0;
818 spin_unlock_irqrestore(&kdb_printf_lock, flags);
819 KDB_STATE_CLEAR(PRINTF_LOCK);
820 atomic_dec(&kdb_event);
821 } else {
822 __release(kdb_printf_lock);
823 }
824 kdb_trap_printk = saved_trap_printk;
825 preempt_enable();
826 return retlen;
827}
828
829int kdb_printf(const char *fmt, ...)
830{
831 va_list ap;
832 int r;
833
834 va_start(ap, fmt);
835 r = vkdb_printf(fmt, ap);
836 va_end(ap);
837
838 return r;
839}
840EXPORT_SYMBOL_GPL(kdb_printf);
1/*
2 * Kernel Debugger Architecture Independent Console I/O handler
3 *
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file "COPYING" in the main directory of this archive
6 * for more details.
7 *
8 * Copyright (c) 1999-2006 Silicon Graphics, Inc. All Rights Reserved.
9 * Copyright (c) 2009 Wind River Systems, Inc. All Rights Reserved.
10 */
11
12#include <linux/module.h>
13#include <linux/types.h>
14#include <linux/ctype.h>
15#include <linux/kernel.h>
16#include <linux/init.h>
17#include <linux/kdev_t.h>
18#include <linux/console.h>
19#include <linux/string.h>
20#include <linux/sched.h>
21#include <linux/smp.h>
22#include <linux/nmi.h>
23#include <linux/delay.h>
24#include <linux/kgdb.h>
25#include <linux/kdb.h>
26#include <linux/kallsyms.h>
27#include "kdb_private.h"
28
29#define CMD_BUFLEN 256
30char kdb_prompt_str[CMD_BUFLEN];
31
32int kdb_trap_printk;
33int kdb_printf_cpu = -1;
34
35static int kgdb_transition_check(char *buffer)
36{
37 if (buffer[0] != '+' && buffer[0] != '$') {
38 KDB_STATE_SET(KGDB_TRANS);
39 kdb_printf("%s", buffer);
40 } else {
41 int slen = strlen(buffer);
42 if (slen > 3 && buffer[slen - 3] == '#') {
43 kdb_gdb_state_pass(buffer);
44 strcpy(buffer, "kgdb");
45 KDB_STATE_SET(DOING_KGDB);
46 return 1;
47 }
48 }
49 return 0;
50}
51
52static int kdb_read_get_key(char *buffer, size_t bufsize)
53{
54#define ESCAPE_UDELAY 1000
55#define ESCAPE_DELAY (2*1000000/ESCAPE_UDELAY) /* 2 seconds worth of udelays */
56 char escape_data[5]; /* longest vt100 escape sequence is 4 bytes */
57 char *ped = escape_data;
58 int escape_delay = 0;
59 get_char_func *f, *f_escape = NULL;
60 int key;
61
62 for (f = &kdb_poll_funcs[0]; ; ++f) {
63 if (*f == NULL) {
64 /* Reset NMI watchdog once per poll loop */
65 touch_nmi_watchdog();
66 f = &kdb_poll_funcs[0];
67 }
68 if (escape_delay == 2) {
69 *ped = '\0';
70 ped = escape_data;
71 --escape_delay;
72 }
73 if (escape_delay == 1) {
74 key = *ped++;
75 if (!*ped)
76 --escape_delay;
77 break;
78 }
79 key = (*f)();
80 if (key == -1) {
81 if (escape_delay) {
82 udelay(ESCAPE_UDELAY);
83 --escape_delay;
84 }
85 continue;
86 }
87 if (bufsize <= 2) {
88 if (key == '\r')
89 key = '\n';
90 *buffer++ = key;
91 *buffer = '\0';
92 return -1;
93 }
94 if (escape_delay == 0 && key == '\e') {
95 escape_delay = ESCAPE_DELAY;
96 ped = escape_data;
97 f_escape = f;
98 }
99 if (escape_delay) {
100 *ped++ = key;
101 if (f_escape != f) {
102 escape_delay = 2;
103 continue;
104 }
105 if (ped - escape_data == 1) {
106 /* \e */
107 continue;
108 } else if (ped - escape_data == 2) {
109 /* \e<something> */
110 if (key != '[')
111 escape_delay = 2;
112 continue;
113 } else if (ped - escape_data == 3) {
114 /* \e[<something> */
115 int mapkey = 0;
116 switch (key) {
117 case 'A': /* \e[A, up arrow */
118 mapkey = 16;
119 break;
120 case 'B': /* \e[B, down arrow */
121 mapkey = 14;
122 break;
123 case 'C': /* \e[C, right arrow */
124 mapkey = 6;
125 break;
126 case 'D': /* \e[D, left arrow */
127 mapkey = 2;
128 break;
129 case '1': /* dropthrough */
130 case '3': /* dropthrough */
131 /* \e[<1,3,4>], may be home, del, end */
132 case '4':
133 mapkey = -1;
134 break;
135 }
136 if (mapkey != -1) {
137 if (mapkey > 0) {
138 escape_data[0] = mapkey;
139 escape_data[1] = '\0';
140 }
141 escape_delay = 2;
142 }
143 continue;
144 } else if (ped - escape_data == 4) {
145 /* \e[<1,3,4><something> */
146 int mapkey = 0;
147 if (key == '~') {
148 switch (escape_data[2]) {
149 case '1': /* \e[1~, home */
150 mapkey = 1;
151 break;
152 case '3': /* \e[3~, del */
153 mapkey = 4;
154 break;
155 case '4': /* \e[4~, end */
156 mapkey = 5;
157 break;
158 }
159 }
160 if (mapkey > 0) {
161 escape_data[0] = mapkey;
162 escape_data[1] = '\0';
163 }
164 escape_delay = 2;
165 continue;
166 }
167 }
168 break; /* A key to process */
169 }
170 return key;
171}
172
173/*
174 * kdb_read
175 *
176 * This function reads a string of characters, terminated by
177 * a newline, or by reaching the end of the supplied buffer,
178 * from the current kernel debugger console device.
179 * Parameters:
180 * buffer - Address of character buffer to receive input characters.
181 * bufsize - size, in bytes, of the character buffer
182 * Returns:
183 * Returns a pointer to the buffer containing the received
184 * character string. This string will be terminated by a
185 * newline character.
186 * Locking:
187 * No locks are required to be held upon entry to this
188 * function. It is not reentrant - it relies on the fact
189 * that while kdb is running on only one "master debug" cpu.
190 * Remarks:
191 *
192 * The buffer size must be >= 2. A buffer size of 2 means that the caller only
193 * wants a single key.
194 *
195 * An escape key could be the start of a vt100 control sequence such as \e[D
196 * (left arrow) or it could be a character in its own right. The standard
197 * method for detecting the difference is to wait for 2 seconds to see if there
198 * are any other characters. kdb is complicated by the lack of a timer service
199 * (interrupts are off), by multiple input sources and by the need to sometimes
200 * return after just one key. Escape sequence processing has to be done as
201 * states in the polling loop.
202 */
203
204static char *kdb_read(char *buffer, size_t bufsize)
205{
206 char *cp = buffer;
207 char *bufend = buffer+bufsize-2; /* Reserve space for newline
208 * and null byte */
209 char *lastchar;
210 char *p_tmp;
211 char tmp;
212 static char tmpbuffer[CMD_BUFLEN];
213 int len = strlen(buffer);
214 int len_tmp;
215 int tab = 0;
216 int count;
217 int i;
218 int diag, dtab_count;
219 int key, buf_size, ret;
220
221
222 diag = kdbgetintenv("DTABCOUNT", &dtab_count);
223 if (diag)
224 dtab_count = 30;
225
226 if (len > 0) {
227 cp += len;
228 if (*(buffer+len-1) == '\n')
229 cp--;
230 }
231
232 lastchar = cp;
233 *cp = '\0';
234 kdb_printf("%s", buffer);
235poll_again:
236 key = kdb_read_get_key(buffer, bufsize);
237 if (key == -1)
238 return buffer;
239 if (key != 9)
240 tab = 0;
241 switch (key) {
242 case 8: /* backspace */
243 if (cp > buffer) {
244 if (cp < lastchar) {
245 memcpy(tmpbuffer, cp, lastchar - cp);
246 memcpy(cp-1, tmpbuffer, lastchar - cp);
247 }
248 *(--lastchar) = '\0';
249 --cp;
250 kdb_printf("\b%s \r", cp);
251 tmp = *cp;
252 *cp = '\0';
253 kdb_printf(kdb_prompt_str);
254 kdb_printf("%s", buffer);
255 *cp = tmp;
256 }
257 break;
258 case 13: /* enter */
259 *lastchar++ = '\n';
260 *lastchar++ = '\0';
261 if (!KDB_STATE(KGDB_TRANS)) {
262 KDB_STATE_SET(KGDB_TRANS);
263 kdb_printf("%s", buffer);
264 }
265 kdb_printf("\n");
266 return buffer;
267 case 4: /* Del */
268 if (cp < lastchar) {
269 memcpy(tmpbuffer, cp+1, lastchar - cp - 1);
270 memcpy(cp, tmpbuffer, lastchar - cp - 1);
271 *(--lastchar) = '\0';
272 kdb_printf("%s \r", cp);
273 tmp = *cp;
274 *cp = '\0';
275 kdb_printf(kdb_prompt_str);
276 kdb_printf("%s", buffer);
277 *cp = tmp;
278 }
279 break;
280 case 1: /* Home */
281 if (cp > buffer) {
282 kdb_printf("\r");
283 kdb_printf(kdb_prompt_str);
284 cp = buffer;
285 }
286 break;
287 case 5: /* End */
288 if (cp < lastchar) {
289 kdb_printf("%s", cp);
290 cp = lastchar;
291 }
292 break;
293 case 2: /* Left */
294 if (cp > buffer) {
295 kdb_printf("\b");
296 --cp;
297 }
298 break;
299 case 14: /* Down */
300 memset(tmpbuffer, ' ',
301 strlen(kdb_prompt_str) + (lastchar-buffer));
302 *(tmpbuffer+strlen(kdb_prompt_str) +
303 (lastchar-buffer)) = '\0';
304 kdb_printf("\r%s\r", tmpbuffer);
305 *lastchar = (char)key;
306 *(lastchar+1) = '\0';
307 return lastchar;
308 case 6: /* Right */
309 if (cp < lastchar) {
310 kdb_printf("%c", *cp);
311 ++cp;
312 }
313 break;
314 case 16: /* Up */
315 memset(tmpbuffer, ' ',
316 strlen(kdb_prompt_str) + (lastchar-buffer));
317 *(tmpbuffer+strlen(kdb_prompt_str) +
318 (lastchar-buffer)) = '\0';
319 kdb_printf("\r%s\r", tmpbuffer);
320 *lastchar = (char)key;
321 *(lastchar+1) = '\0';
322 return lastchar;
323 case 9: /* Tab */
324 if (tab < 2)
325 ++tab;
326 p_tmp = buffer;
327 while (*p_tmp == ' ')
328 p_tmp++;
329 if (p_tmp > cp)
330 break;
331 memcpy(tmpbuffer, p_tmp, cp-p_tmp);
332 *(tmpbuffer + (cp-p_tmp)) = '\0';
333 p_tmp = strrchr(tmpbuffer, ' ');
334 if (p_tmp)
335 ++p_tmp;
336 else
337 p_tmp = tmpbuffer;
338 len = strlen(p_tmp);
339 buf_size = sizeof(tmpbuffer) - (p_tmp - tmpbuffer);
340 count = kallsyms_symbol_complete(p_tmp, buf_size);
341 if (tab == 2 && count > 0) {
342 kdb_printf("\n%d symbols are found.", count);
343 if (count > dtab_count) {
344 count = dtab_count;
345 kdb_printf(" But only first %d symbols will"
346 " be printed.\nYou can change the"
347 " environment variable DTABCOUNT.",
348 count);
349 }
350 kdb_printf("\n");
351 for (i = 0; i < count; i++) {
352 ret = kallsyms_symbol_next(p_tmp, i, buf_size);
353 if (WARN_ON(!ret))
354 break;
355 if (ret != -E2BIG)
356 kdb_printf("%s ", p_tmp);
357 else
358 kdb_printf("%s... ", p_tmp);
359 *(p_tmp + len) = '\0';
360 }
361 if (i >= dtab_count)
362 kdb_printf("...");
363 kdb_printf("\n");
364 kdb_printf(kdb_prompt_str);
365 kdb_printf("%s", buffer);
366 } else if (tab != 2 && count > 0) {
367 len_tmp = strlen(p_tmp);
368 strncpy(p_tmp+len_tmp, cp, lastchar-cp+1);
369 len_tmp = strlen(p_tmp);
370 strncpy(cp, p_tmp+len, len_tmp-len + 1);
371 len = len_tmp - len;
372 kdb_printf("%s", cp);
373 cp += len;
374 lastchar += len;
375 }
376 kdb_nextline = 1; /* reset output line number */
377 break;
378 default:
379 if (key >= 32 && lastchar < bufend) {
380 if (cp < lastchar) {
381 memcpy(tmpbuffer, cp, lastchar - cp);
382 memcpy(cp+1, tmpbuffer, lastchar - cp);
383 *++lastchar = '\0';
384 *cp = key;
385 kdb_printf("%s\r", cp);
386 ++cp;
387 tmp = *cp;
388 *cp = '\0';
389 kdb_printf(kdb_prompt_str);
390 kdb_printf("%s", buffer);
391 *cp = tmp;
392 } else {
393 *++lastchar = '\0';
394 *cp++ = key;
395 /* The kgdb transition check will hide
396 * printed characters if we think that
397 * kgdb is connecting, until the check
398 * fails */
399 if (!KDB_STATE(KGDB_TRANS)) {
400 if (kgdb_transition_check(buffer))
401 return buffer;
402 } else {
403 kdb_printf("%c", key);
404 }
405 }
406 /* Special escape to kgdb */
407 if (lastchar - buffer >= 5 &&
408 strcmp(lastchar - 5, "$?#3f") == 0) {
409 kdb_gdb_state_pass(lastchar - 5);
410 strcpy(buffer, "kgdb");
411 KDB_STATE_SET(DOING_KGDB);
412 return buffer;
413 }
414 if (lastchar - buffer >= 11 &&
415 strcmp(lastchar - 11, "$qSupported") == 0) {
416 kdb_gdb_state_pass(lastchar - 11);
417 strcpy(buffer, "kgdb");
418 KDB_STATE_SET(DOING_KGDB);
419 return buffer;
420 }
421 }
422 break;
423 }
424 goto poll_again;
425}
426
427/*
428 * kdb_getstr
429 *
430 * Print the prompt string and read a command from the
431 * input device.
432 *
433 * Parameters:
434 * buffer Address of buffer to receive command
435 * bufsize Size of buffer in bytes
436 * prompt Pointer to string to use as prompt string
437 * Returns:
438 * Pointer to command buffer.
439 * Locking:
440 * None.
441 * Remarks:
442 * For SMP kernels, the processor number will be
443 * substituted for %d, %x or %o in the prompt.
444 */
445
446char *kdb_getstr(char *buffer, size_t bufsize, const char *prompt)
447{
448 if (prompt && kdb_prompt_str != prompt)
449 strscpy(kdb_prompt_str, prompt, CMD_BUFLEN);
450 kdb_printf(kdb_prompt_str);
451 kdb_nextline = 1; /* Prompt and input resets line number */
452 return kdb_read(buffer, bufsize);
453}
454
455/*
456 * kdb_input_flush
457 *
458 * Get rid of any buffered console input.
459 *
460 * Parameters:
461 * none
462 * Returns:
463 * nothing
464 * Locking:
465 * none
466 * Remarks:
467 * Call this function whenever you want to flush input. If there is any
468 * outstanding input, it ignores all characters until there has been no
469 * data for approximately 1ms.
470 */
471
472static void kdb_input_flush(void)
473{
474 get_char_func *f;
475 int res;
476 int flush_delay = 1;
477 while (flush_delay) {
478 flush_delay--;
479empty:
480 touch_nmi_watchdog();
481 for (f = &kdb_poll_funcs[0]; *f; ++f) {
482 res = (*f)();
483 if (res != -1) {
484 flush_delay = 1;
485 goto empty;
486 }
487 }
488 if (flush_delay)
489 mdelay(1);
490 }
491}
492
493/*
494 * kdb_printf
495 *
496 * Print a string to the output device(s).
497 *
498 * Parameters:
499 * printf-like format and optional args.
500 * Returns:
501 * 0
502 * Locking:
503 * None.
504 * Remarks:
505 * use 'kdbcons->write()' to avoid polluting 'log_buf' with
506 * kdb output.
507 *
508 * If the user is doing a cmd args | grep srch
509 * then kdb_grepping_flag is set.
510 * In that case we need to accumulate full lines (ending in \n) before
511 * searching for the pattern.
512 */
513
514static char kdb_buffer[256]; /* A bit too big to go on stack */
515static char *next_avail = kdb_buffer;
516static int size_avail;
517static int suspend_grep;
518
519/*
520 * search arg1 to see if it contains arg2
521 * (kdmain.c provides flags for ^pat and pat$)
522 *
523 * return 1 for found, 0 for not found
524 */
525static int kdb_search_string(char *searched, char *searchfor)
526{
527 char firstchar, *cp;
528 int len1, len2;
529
530 /* not counting the newline at the end of "searched" */
531 len1 = strlen(searched)-1;
532 len2 = strlen(searchfor);
533 if (len1 < len2)
534 return 0;
535 if (kdb_grep_leading && kdb_grep_trailing && len1 != len2)
536 return 0;
537 if (kdb_grep_leading) {
538 if (!strncmp(searched, searchfor, len2))
539 return 1;
540 } else if (kdb_grep_trailing) {
541 if (!strncmp(searched+len1-len2, searchfor, len2))
542 return 1;
543 } else {
544 firstchar = *searchfor;
545 cp = searched;
546 while ((cp = strchr(cp, firstchar))) {
547 if (!strncmp(cp, searchfor, len2))
548 return 1;
549 cp++;
550 }
551 }
552 return 0;
553}
554
555int vkdb_printf(enum kdb_msgsrc src, const char *fmt, va_list ap)
556{
557 int diag;
558 int linecount;
559 int colcount;
560 int logging, saved_loglevel = 0;
561 int retlen = 0;
562 int fnd, len;
563 int this_cpu, old_cpu;
564 char *cp, *cp2, *cphold = NULL, replaced_byte = ' ';
565 char *moreprompt = "more> ";
566 struct console *c = console_drivers;
567 unsigned long uninitialized_var(flags);
568
569 /* Serialize kdb_printf if multiple cpus try to write at once.
570 * But if any cpu goes recursive in kdb, just print the output,
571 * even if it is interleaved with any other text.
572 */
573 local_irq_save(flags);
574 this_cpu = smp_processor_id();
575 for (;;) {
576 old_cpu = cmpxchg(&kdb_printf_cpu, -1, this_cpu);
577 if (old_cpu == -1 || old_cpu == this_cpu)
578 break;
579
580 cpu_relax();
581 }
582
583 diag = kdbgetintenv("LINES", &linecount);
584 if (diag || linecount <= 1)
585 linecount = 24;
586
587 diag = kdbgetintenv("COLUMNS", &colcount);
588 if (diag || colcount <= 1)
589 colcount = 80;
590
591 diag = kdbgetintenv("LOGGING", &logging);
592 if (diag)
593 logging = 0;
594
595 if (!kdb_grepping_flag || suspend_grep) {
596 /* normally, every vsnprintf starts a new buffer */
597 next_avail = kdb_buffer;
598 size_avail = sizeof(kdb_buffer);
599 }
600 vsnprintf(next_avail, size_avail, fmt, ap);
601
602 /*
603 * If kdb_parse() found that the command was cmd xxx | grep yyy
604 * then kdb_grepping_flag is set, and kdb_grep_string contains yyy
605 *
606 * Accumulate the print data up to a newline before searching it.
607 * (vsnprintf does null-terminate the string that it generates)
608 */
609
610 /* skip the search if prints are temporarily unconditional */
611 if (!suspend_grep && kdb_grepping_flag) {
612 cp = strchr(kdb_buffer, '\n');
613 if (!cp) {
614 /*
615 * Special cases that don't end with newlines
616 * but should be written without one:
617 * The "[nn]kdb> " prompt should
618 * appear at the front of the buffer.
619 *
620 * The "[nn]more " prompt should also be
621 * (MOREPROMPT -> moreprompt)
622 * written * but we print that ourselves,
623 * we set the suspend_grep flag to make
624 * it unconditional.
625 *
626 */
627 if (next_avail == kdb_buffer) {
628 /*
629 * these should occur after a newline,
630 * so they will be at the front of the
631 * buffer
632 */
633 cp2 = kdb_buffer;
634 len = strlen(kdb_prompt_str);
635 if (!strncmp(cp2, kdb_prompt_str, len)) {
636 /*
637 * We're about to start a new
638 * command, so we can go back
639 * to normal mode.
640 */
641 kdb_grepping_flag = 0;
642 goto kdb_printit;
643 }
644 }
645 /* no newline; don't search/write the buffer
646 until one is there */
647 len = strlen(kdb_buffer);
648 next_avail = kdb_buffer + len;
649 size_avail = sizeof(kdb_buffer) - len;
650 goto kdb_print_out;
651 }
652
653 /*
654 * The newline is present; print through it or discard
655 * it, depending on the results of the search.
656 */
657 cp++; /* to byte after the newline */
658 replaced_byte = *cp; /* remember what/where it was */
659 cphold = cp;
660 *cp = '\0'; /* end the string for our search */
661
662 /*
663 * We now have a newline at the end of the string
664 * Only continue with this output if it contains the
665 * search string.
666 */
667 fnd = kdb_search_string(kdb_buffer, kdb_grep_string);
668 if (!fnd) {
669 /*
670 * At this point the complete line at the start
671 * of kdb_buffer can be discarded, as it does
672 * not contain what the user is looking for.
673 * Shift the buffer left.
674 */
675 *cphold = replaced_byte;
676 strcpy(kdb_buffer, cphold);
677 len = strlen(kdb_buffer);
678 next_avail = kdb_buffer + len;
679 size_avail = sizeof(kdb_buffer) - len;
680 goto kdb_print_out;
681 }
682 if (kdb_grepping_flag >= KDB_GREPPING_FLAG_SEARCH)
683 /*
684 * This was a interactive search (using '/' at more
685 * prompt) and it has completed. Clear the flag.
686 */
687 kdb_grepping_flag = 0;
688 /*
689 * at this point the string is a full line and
690 * should be printed, up to the null.
691 */
692 }
693kdb_printit:
694
695 /*
696 * Write to all consoles.
697 */
698 retlen = strlen(kdb_buffer);
699 cp = (char *) printk_skip_headers(kdb_buffer);
700 if (!dbg_kdb_mode && kgdb_connected) {
701 gdbstub_msg_write(cp, retlen - (cp - kdb_buffer));
702 } else {
703 if (dbg_io_ops && !dbg_io_ops->is_console) {
704 len = retlen - (cp - kdb_buffer);
705 cp2 = cp;
706 while (len--) {
707 dbg_io_ops->write_char(*cp2);
708 cp2++;
709 }
710 }
711 while (c) {
712 c->write(c, cp, retlen - (cp - kdb_buffer));
713 touch_nmi_watchdog();
714 c = c->next;
715 }
716 }
717 if (logging) {
718 saved_loglevel = console_loglevel;
719 console_loglevel = CONSOLE_LOGLEVEL_SILENT;
720 if (printk_get_level(kdb_buffer) || src == KDB_MSGSRC_PRINTK)
721 printk("%s", kdb_buffer);
722 else
723 pr_info("%s", kdb_buffer);
724 }
725
726 if (KDB_STATE(PAGER)) {
727 /*
728 * Check printed string to decide how to bump the
729 * kdb_nextline to control when the more prompt should
730 * show up.
731 */
732 int got = 0;
733 len = retlen;
734 while (len--) {
735 if (kdb_buffer[len] == '\n') {
736 kdb_nextline++;
737 got = 0;
738 } else if (kdb_buffer[len] == '\r') {
739 got = 0;
740 } else {
741 got++;
742 }
743 }
744 kdb_nextline += got / (colcount + 1);
745 }
746
747 /* check for having reached the LINES number of printed lines */
748 if (kdb_nextline >= linecount) {
749 char buf1[16] = "";
750
751 /* Watch out for recursion here. Any routine that calls
752 * kdb_printf will come back through here. And kdb_read
753 * uses kdb_printf to echo on serial consoles ...
754 */
755 kdb_nextline = 1; /* In case of recursion */
756
757 /*
758 * Pause until cr.
759 */
760 moreprompt = kdbgetenv("MOREPROMPT");
761 if (moreprompt == NULL)
762 moreprompt = "more> ";
763
764 kdb_input_flush();
765 c = console_drivers;
766
767 if (dbg_io_ops && !dbg_io_ops->is_console) {
768 len = strlen(moreprompt);
769 cp = moreprompt;
770 while (len--) {
771 dbg_io_ops->write_char(*cp);
772 cp++;
773 }
774 }
775 while (c) {
776 c->write(c, moreprompt, strlen(moreprompt));
777 touch_nmi_watchdog();
778 c = c->next;
779 }
780
781 if (logging)
782 printk("%s", moreprompt);
783
784 kdb_read(buf1, 2); /* '2' indicates to return
785 * immediately after getting one key. */
786 kdb_nextline = 1; /* Really set output line 1 */
787
788 /* empty and reset the buffer: */
789 kdb_buffer[0] = '\0';
790 next_avail = kdb_buffer;
791 size_avail = sizeof(kdb_buffer);
792 if ((buf1[0] == 'q') || (buf1[0] == 'Q')) {
793 /* user hit q or Q */
794 KDB_FLAG_SET(CMD_INTERRUPT); /* command interrupted */
795 KDB_STATE_CLEAR(PAGER);
796 /* end of command output; back to normal mode */
797 kdb_grepping_flag = 0;
798 kdb_printf("\n");
799 } else if (buf1[0] == ' ') {
800 kdb_printf("\r");
801 suspend_grep = 1; /* for this recursion */
802 } else if (buf1[0] == '\n') {
803 kdb_nextline = linecount - 1;
804 kdb_printf("\r");
805 suspend_grep = 1; /* for this recursion */
806 } else if (buf1[0] == '/' && !kdb_grepping_flag) {
807 kdb_printf("\r");
808 kdb_getstr(kdb_grep_string, KDB_GREP_STRLEN,
809 kdbgetenv("SEARCHPROMPT") ?: "search> ");
810 *strchrnul(kdb_grep_string, '\n') = '\0';
811 kdb_grepping_flag += KDB_GREPPING_FLAG_SEARCH;
812 suspend_grep = 1; /* for this recursion */
813 } else if (buf1[0] && buf1[0] != '\n') {
814 /* user hit something other than enter */
815 suspend_grep = 1; /* for this recursion */
816 if (buf1[0] != '/')
817 kdb_printf(
818 "\nOnly 'q', 'Q' or '/' are processed at "
819 "more prompt, input ignored\n");
820 else
821 kdb_printf("\n'/' cannot be used during | "
822 "grep filtering, input ignored\n");
823 } else if (kdb_grepping_flag) {
824 /* user hit enter */
825 suspend_grep = 1; /* for this recursion */
826 kdb_printf("\n");
827 }
828 kdb_input_flush();
829 }
830
831 /*
832 * For grep searches, shift the printed string left.
833 * replaced_byte contains the character that was overwritten with
834 * the terminating null, and cphold points to the null.
835 * Then adjust the notion of available space in the buffer.
836 */
837 if (kdb_grepping_flag && !suspend_grep) {
838 *cphold = replaced_byte;
839 strcpy(kdb_buffer, cphold);
840 len = strlen(kdb_buffer);
841 next_avail = kdb_buffer + len;
842 size_avail = sizeof(kdb_buffer) - len;
843 }
844
845kdb_print_out:
846 suspend_grep = 0; /* end of what may have been a recursive call */
847 if (logging)
848 console_loglevel = saved_loglevel;
849 /* kdb_printf_cpu locked the code above. */
850 smp_store_release(&kdb_printf_cpu, old_cpu);
851 local_irq_restore(flags);
852 return retlen;
853}
854
855int kdb_printf(const char *fmt, ...)
856{
857 va_list ap;
858 int r;
859
860 va_start(ap, fmt);
861 r = vkdb_printf(KDB_MSGSRC_INTERNAL, fmt, ap);
862 va_end(ap);
863
864 return r;
865}
866EXPORT_SYMBOL_GPL(kdb_printf);