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-rw-r--r--kernel/debug/kdb/kdb_io.c826
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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 void kgdb_transition_check(char *buffer)
35{
36 int slen = strlen(buffer);
37 if (strncmp(buffer, "$?#3f", slen) != 0 &&
38 strncmp(buffer, "$qSupported#37", slen) != 0 &&
39 strncmp(buffer, "+$qSupported#37", slen) != 0) {
40 KDB_STATE_SET(KGDB_TRANS);
41 kdb_printf("%s", buffer);
42 }
43}
44
45static int kdb_read_get_key(char *buffer, size_t bufsize)
46{
47#define ESCAPE_UDELAY 1000
48#define ESCAPE_DELAY (2*1000000/ESCAPE_UDELAY) /* 2 seconds worth of udelays */
49 char escape_data[5]; /* longest vt100 escape sequence is 4 bytes */
50 char *ped = escape_data;
51 int escape_delay = 0;
52 get_char_func *f, *f_escape = NULL;
53 int key;
54
55 for (f = &kdb_poll_funcs[0]; ; ++f) {
56 if (*f == NULL) {
57 /* Reset NMI watchdog once per poll loop */
58 touch_nmi_watchdog();
59 f = &kdb_poll_funcs[0];
60 }
61 if (escape_delay == 2) {
62 *ped = '\0';
63 ped = escape_data;
64 --escape_delay;
65 }
66 if (escape_delay == 1) {
67 key = *ped++;
68 if (!*ped)
69 --escape_delay;
70 break;
71 }
72 key = (*f)();
73 if (key == -1) {
74 if (escape_delay) {
75 udelay(ESCAPE_UDELAY);
76 --escape_delay;
77 }
78 continue;
79 }
80 if (bufsize <= 2) {
81 if (key == '\r')
82 key = '\n';
83 *buffer++ = key;
84 *buffer = '\0';
85 return -1;
86 }
87 if (escape_delay == 0 && key == '\e') {
88 escape_delay = ESCAPE_DELAY;
89 ped = escape_data;
90 f_escape = f;
91 }
92 if (escape_delay) {
93 *ped++ = key;
94 if (f_escape != f) {
95 escape_delay = 2;
96 continue;
97 }
98 if (ped - escape_data == 1) {
99 /* \e */
100 continue;
101 } else if (ped - escape_data == 2) {
102 /* \e<something> */
103 if (key != '[')
104 escape_delay = 2;
105 continue;
106 } else if (ped - escape_data == 3) {
107 /* \e[<something> */
108 int mapkey = 0;
109 switch (key) {
110 case 'A': /* \e[A, up arrow */
111 mapkey = 16;
112 break;
113 case 'B': /* \e[B, down arrow */
114 mapkey = 14;
115 break;
116 case 'C': /* \e[C, right arrow */
117 mapkey = 6;
118 break;
119 case 'D': /* \e[D, left arrow */
120 mapkey = 2;
121 break;
122 case '1': /* dropthrough */
123 case '3': /* dropthrough */
124 /* \e[<1,3,4>], may be home, del, end */
125 case '4':
126 mapkey = -1;
127 break;
128 }
129 if (mapkey != -1) {
130 if (mapkey > 0) {
131 escape_data[0] = mapkey;
132 escape_data[1] = '\0';
133 }
134 escape_delay = 2;
135 }
136 continue;
137 } else if (ped - escape_data == 4) {
138 /* \e[<1,3,4><something> */
139 int mapkey = 0;
140 if (key == '~') {
141 switch (escape_data[2]) {
142 case '1': /* \e[1~, home */
143 mapkey = 1;
144 break;
145 case '3': /* \e[3~, del */
146 mapkey = 4;
147 break;
148 case '4': /* \e[4~, end */
149 mapkey = 5;
150 break;
151 }
152 }
153 if (mapkey > 0) {
154 escape_data[0] = mapkey;
155 escape_data[1] = '\0';
156 }
157 escape_delay = 2;
158 continue;
159 }
160 }
161 break; /* A key to process */
162 }
163 return key;
164}
165
166/*
167 * kdb_read
168 *
169 * This function reads a string of characters, terminated by
170 * a newline, or by reaching the end of the supplied buffer,
171 * from the current kernel debugger console device.
172 * Parameters:
173 * buffer - Address of character buffer to receive input characters.
174 * bufsize - size, in bytes, of the character buffer
175 * Returns:
176 * Returns a pointer to the buffer containing the received
177 * character string. This string will be terminated by a
178 * newline character.
179 * Locking:
180 * No locks are required to be held upon entry to this
181 * function. It is not reentrant - it relies on the fact
182 * that while kdb is running on only one "master debug" cpu.
183 * Remarks:
184 *
185 * The buffer size must be >= 2. A buffer size of 2 means that the caller only
186 * wants a single key.
187 *
188 * An escape key could be the start of a vt100 control sequence such as \e[D
189 * (left arrow) or it could be a character in its own right. The standard
190 * method for detecting the difference is to wait for 2 seconds to see if there
191 * are any other characters. kdb is complicated by the lack of a timer service
192 * (interrupts are off), by multiple input sources and by the need to sometimes
193 * return after just one key. Escape sequence processing has to be done as
194 * states in the polling loop.
195 */
196
197static char *kdb_read(char *buffer, size_t bufsize)
198{
199 char *cp = buffer;
200 char *bufend = buffer+bufsize-2; /* Reserve space for newline
201 * and null byte */
202 char *lastchar;
203 char *p_tmp;
204 char tmp;
205 static char tmpbuffer[CMD_BUFLEN];
206 int len = strlen(buffer);
207 int len_tmp;
208 int tab = 0;
209 int count;
210 int i;
211 int diag, dtab_count;
212 int key;
213
214
215 diag = kdbgetintenv("DTABCOUNT", &dtab_count);
216 if (diag)
217 dtab_count = 30;
218
219 if (len > 0) {
220 cp += len;
221 if (*(buffer+len-1) == '\n')
222 cp--;
223 }
224
225 lastchar = cp;
226 *cp = '\0';
227 kdb_printf("%s", buffer);
228poll_again:
229 key = kdb_read_get_key(buffer, bufsize);
230 if (key == -1)
231 return buffer;
232 if (key != 9)
233 tab = 0;
234 switch (key) {
235 case 8: /* backspace */
236 if (cp > buffer) {
237 if (cp < lastchar) {
238 memcpy(tmpbuffer, cp, lastchar - cp);
239 memcpy(cp-1, tmpbuffer, lastchar - cp);
240 }
241 *(--lastchar) = '\0';
242 --cp;
243 kdb_printf("\b%s \r", cp);
244 tmp = *cp;
245 *cp = '\0';
246 kdb_printf(kdb_prompt_str);
247 kdb_printf("%s", buffer);
248 *cp = tmp;
249 }
250 break;
251 case 13: /* enter */
252 *lastchar++ = '\n';
253 *lastchar++ = '\0';
254 kdb_printf("\n");
255 return buffer;
256 case 4: /* Del */
257 if (cp < lastchar) {
258 memcpy(tmpbuffer, cp+1, lastchar - cp - 1);
259 memcpy(cp, tmpbuffer, lastchar - cp - 1);
260 *(--lastchar) = '\0';
261 kdb_printf("%s \r", cp);
262 tmp = *cp;
263 *cp = '\0';
264 kdb_printf(kdb_prompt_str);
265 kdb_printf("%s", buffer);
266 *cp = tmp;
267 }
268 break;
269 case 1: /* Home */
270 if (cp > buffer) {
271 kdb_printf("\r");
272 kdb_printf(kdb_prompt_str);
273 cp = buffer;
274 }
275 break;
276 case 5: /* End */
277 if (cp < lastchar) {
278 kdb_printf("%s", cp);
279 cp = lastchar;
280 }
281 break;
282 case 2: /* Left */
283 if (cp > buffer) {
284 kdb_printf("\b");
285 --cp;
286 }
287 break;
288 case 14: /* Down */
289 memset(tmpbuffer, ' ',
290 strlen(kdb_prompt_str) + (lastchar-buffer));
291 *(tmpbuffer+strlen(kdb_prompt_str) +
292 (lastchar-buffer)) = '\0';
293 kdb_printf("\r%s\r", tmpbuffer);
294 *lastchar = (char)key;
295 *(lastchar+1) = '\0';
296 return lastchar;
297 case 6: /* Right */
298 if (cp < lastchar) {
299 kdb_printf("%c", *cp);
300 ++cp;
301 }
302 break;
303 case 16: /* Up */
304 memset(tmpbuffer, ' ',
305 strlen(kdb_prompt_str) + (lastchar-buffer));
306 *(tmpbuffer+strlen(kdb_prompt_str) +
307 (lastchar-buffer)) = '\0';
308 kdb_printf("\r%s\r", tmpbuffer);
309 *lastchar = (char)key;
310 *(lastchar+1) = '\0';
311 return lastchar;
312 case 9: /* Tab */
313 if (tab < 2)
314 ++tab;
315 p_tmp = buffer;
316 while (*p_tmp == ' ')
317 p_tmp++;
318 if (p_tmp > cp)
319 break;
320 memcpy(tmpbuffer, p_tmp, cp-p_tmp);
321 *(tmpbuffer + (cp-p_tmp)) = '\0';
322 p_tmp = strrchr(tmpbuffer, ' ');
323 if (p_tmp)
324 ++p_tmp;
325 else
326 p_tmp = tmpbuffer;
327 len = strlen(p_tmp);
328 count = kallsyms_symbol_complete(p_tmp,
329 sizeof(tmpbuffer) -
330 (p_tmp - tmpbuffer));
331 if (tab == 2 && count > 0) {
332 kdb_printf("\n%d symbols are found.", count);
333 if (count > dtab_count) {
334 count = dtab_count;
335 kdb_printf(" But only first %d symbols will"
336 " be printed.\nYou can change the"
337 " environment variable DTABCOUNT.",
338 count);
339 }
340 kdb_printf("\n");
341 for (i = 0; i < count; i++) {
342 if (kallsyms_symbol_next(p_tmp, i) < 0)
343 break;
344 kdb_printf("%s ", p_tmp);
345 *(p_tmp + len) = '\0';
346 }
347 if (i >= dtab_count)
348 kdb_printf("...");
349 kdb_printf("\n");
350 kdb_printf(kdb_prompt_str);
351 kdb_printf("%s", buffer);
352 } else if (tab != 2 && count > 0) {
353 len_tmp = strlen(p_tmp);
354 strncpy(p_tmp+len_tmp, cp, lastchar-cp+1);
355 len_tmp = strlen(p_tmp);
356 strncpy(cp, p_tmp+len, len_tmp-len + 1);
357 len = len_tmp - len;
358 kdb_printf("%s", cp);
359 cp += len;
360 lastchar += len;
361 }
362 kdb_nextline = 1; /* reset output line number */
363 break;
364 default:
365 if (key >= 32 && lastchar < bufend) {
366 if (cp < lastchar) {
367 memcpy(tmpbuffer, cp, lastchar - cp);
368 memcpy(cp+1, tmpbuffer, lastchar - cp);
369 *++lastchar = '\0';
370 *cp = key;
371 kdb_printf("%s\r", cp);
372 ++cp;
373 tmp = *cp;
374 *cp = '\0';
375 kdb_printf(kdb_prompt_str);
376 kdb_printf("%s", buffer);
377 *cp = tmp;
378 } else {
379 *++lastchar = '\0';
380 *cp++ = key;
381 /* The kgdb transition check will hide
382 * printed characters if we think that
383 * kgdb is connecting, until the check
384 * fails */
385 if (!KDB_STATE(KGDB_TRANS))
386 kgdb_transition_check(buffer);
387 else
388 kdb_printf("%c", key);
389 }
390 /* Special escape to kgdb */
391 if (lastchar - buffer >= 5 &&
392 strcmp(lastchar - 5, "$?#3f") == 0) {
393 strcpy(buffer, "kgdb");
394 KDB_STATE_SET(DOING_KGDB);
395 return buffer;
396 }
397 if (lastchar - buffer >= 14 &&
398 strcmp(lastchar - 14, "$qSupported#37") == 0) {
399 strcpy(buffer, "kgdb");
400 KDB_STATE_SET(DOING_KGDB2);
401 return buffer;
402 }
403 }
404 break;
405 }
406 goto poll_again;
407}
408
409/*
410 * kdb_getstr
411 *
412 * Print the prompt string and read a command from the
413 * input device.
414 *
415 * Parameters:
416 * buffer Address of buffer to receive command
417 * bufsize Size of buffer in bytes
418 * prompt Pointer to string to use as prompt string
419 * Returns:
420 * Pointer to command buffer.
421 * Locking:
422 * None.
423 * Remarks:
424 * For SMP kernels, the processor number will be
425 * substituted for %d, %x or %o in the prompt.
426 */
427
428char *kdb_getstr(char *buffer, size_t bufsize, char *prompt)
429{
430 if (prompt && kdb_prompt_str != prompt)
431 strncpy(kdb_prompt_str, prompt, CMD_BUFLEN);
432 kdb_printf(kdb_prompt_str);
433 kdb_nextline = 1; /* Prompt and input resets line number */
434 return kdb_read(buffer, bufsize);
435}
436
437/*
438 * kdb_input_flush
439 *
440 * Get rid of any buffered console input.
441 *
442 * Parameters:
443 * none
444 * Returns:
445 * nothing
446 * Locking:
447 * none
448 * Remarks:
449 * Call this function whenever you want to flush input. If there is any
450 * outstanding input, it ignores all characters until there has been no
451 * data for approximately 1ms.
452 */
453
454static void kdb_input_flush(void)
455{
456 get_char_func *f;
457 int res;
458 int flush_delay = 1;
459 while (flush_delay) {
460 flush_delay--;
461empty:
462 touch_nmi_watchdog();
463 for (f = &kdb_poll_funcs[0]; *f; ++f) {
464 res = (*f)();
465 if (res != -1) {
466 flush_delay = 1;
467 goto empty;
468 }
469 }
470 if (flush_delay)
471 mdelay(1);
472 }
473}
474
475/*
476 * kdb_printf
477 *
478 * Print a string to the output device(s).
479 *
480 * Parameters:
481 * printf-like format and optional args.
482 * Returns:
483 * 0
484 * Locking:
485 * None.
486 * Remarks:
487 * use 'kdbcons->write()' to avoid polluting 'log_buf' with
488 * kdb output.
489 *
490 * If the user is doing a cmd args | grep srch
491 * then kdb_grepping_flag is set.
492 * In that case we need to accumulate full lines (ending in \n) before
493 * searching for the pattern.
494 */
495
496static char kdb_buffer[256]; /* A bit too big to go on stack */
497static char *next_avail = kdb_buffer;
498static int size_avail;
499static int suspend_grep;
500
501/*
502 * search arg1 to see if it contains arg2
503 * (kdmain.c provides flags for ^pat and pat$)
504 *
505 * return 1 for found, 0 for not found
506 */
507static int kdb_search_string(char *searched, char *searchfor)
508{
509 char firstchar, *cp;
510 int len1, len2;
511
512 /* not counting the newline at the end of "searched" */
513 len1 = strlen(searched)-1;
514 len2 = strlen(searchfor);
515 if (len1 < len2)
516 return 0;
517 if (kdb_grep_leading && kdb_grep_trailing && len1 != len2)
518 return 0;
519 if (kdb_grep_leading) {
520 if (!strncmp(searched, searchfor, len2))
521 return 1;
522 } else if (kdb_grep_trailing) {
523 if (!strncmp(searched+len1-len2, searchfor, len2))
524 return 1;
525 } else {
526 firstchar = *searchfor;
527 cp = searched;
528 while ((cp = strchr(cp, firstchar))) {
529 if (!strncmp(cp, searchfor, len2))
530 return 1;
531 cp++;
532 }
533 }
534 return 0;
535}
536
537int vkdb_printf(const char *fmt, va_list ap)
538{
539 int diag;
540 int linecount;
541 int logging, saved_loglevel = 0;
542 int saved_trap_printk;
543 int got_printf_lock = 0;
544 int retlen = 0;
545 int fnd, len;
546 char *cp, *cp2, *cphold = NULL, replaced_byte = ' ';
547 char *moreprompt = "more> ";
548 struct console *c = console_drivers;
549 static DEFINE_SPINLOCK(kdb_printf_lock);
550 unsigned long uninitialized_var(flags);
551
552 preempt_disable();
553 saved_trap_printk = kdb_trap_printk;
554 kdb_trap_printk = 0;
555
556 /* Serialize kdb_printf if multiple cpus try to write at once.
557 * But if any cpu goes recursive in kdb, just print the output,
558 * even if it is interleaved with any other text.
559 */
560 if (!KDB_STATE(PRINTF_LOCK)) {
561 KDB_STATE_SET(PRINTF_LOCK);
562 spin_lock_irqsave(&kdb_printf_lock, flags);
563 got_printf_lock = 1;
564 atomic_inc(&kdb_event);
565 } else {
566 __acquire(kdb_printf_lock);
567 }
568
569 diag = kdbgetintenv("LINES", &linecount);
570 if (diag || linecount <= 1)
571 linecount = 24;
572
573 diag = kdbgetintenv("LOGGING", &logging);
574 if (diag)
575 logging = 0;
576
577 if (!kdb_grepping_flag || suspend_grep) {
578 /* normally, every vsnprintf starts a new buffer */
579 next_avail = kdb_buffer;
580 size_avail = sizeof(kdb_buffer);
581 }
582 vsnprintf(next_avail, size_avail, fmt, ap);
583
584 /*
585 * If kdb_parse() found that the command was cmd xxx | grep yyy
586 * then kdb_grepping_flag is set, and kdb_grep_string contains yyy
587 *
588 * Accumulate the print data up to a newline before searching it.
589 * (vsnprintf does null-terminate the string that it generates)
590 */
591
592 /* skip the search if prints are temporarily unconditional */
593 if (!suspend_grep && kdb_grepping_flag) {
594 cp = strchr(kdb_buffer, '\n');
595 if (!cp) {
596 /*
597 * Special cases that don't end with newlines
598 * but should be written without one:
599 * The "[nn]kdb> " prompt should
600 * appear at the front of the buffer.
601 *
602 * The "[nn]more " prompt should also be
603 * (MOREPROMPT -> moreprompt)
604 * written * but we print that ourselves,
605 * we set the suspend_grep flag to make
606 * it unconditional.
607 *
608 */
609 if (next_avail == kdb_buffer) {
610 /*
611 * these should occur after a newline,
612 * so they will be at the front of the
613 * buffer
614 */
615 cp2 = kdb_buffer;
616 len = strlen(kdb_prompt_str);
617 if (!strncmp(cp2, kdb_prompt_str, len)) {
618 /*
619 * We're about to start a new
620 * command, so we can go back
621 * to normal mode.
622 */
623 kdb_grepping_flag = 0;
624 goto kdb_printit;
625 }
626 }
627 /* no newline; don't search/write the buffer
628 until one is there */
629 len = strlen(kdb_buffer);
630 next_avail = kdb_buffer + len;
631 size_avail = sizeof(kdb_buffer) - len;
632 goto kdb_print_out;
633 }
634
635 /*
636 * The newline is present; print through it or discard
637 * it, depending on the results of the search.
638 */
639 cp++; /* to byte after the newline */
640 replaced_byte = *cp; /* remember what/where it was */
641 cphold = cp;
642 *cp = '\0'; /* end the string for our search */
643
644 /*
645 * We now have a newline at the end of the string
646 * Only continue with this output if it contains the
647 * search string.
648 */
649 fnd = kdb_search_string(kdb_buffer, kdb_grep_string);
650 if (!fnd) {
651 /*
652 * At this point the complete line at the start
653 * of kdb_buffer can be discarded, as it does
654 * not contain what the user is looking for.
655 * Shift the buffer left.
656 */
657 *cphold = replaced_byte;
658 strcpy(kdb_buffer, cphold);
659 len = strlen(kdb_buffer);
660 next_avail = kdb_buffer + len;
661 size_avail = sizeof(kdb_buffer) - len;
662 goto kdb_print_out;
663 }
664 /*
665 * at this point the string is a full line and
666 * should be printed, up to the null.
667 */
668 }
669kdb_printit:
670
671 /*
672 * Write to all consoles.
673 */
674 retlen = strlen(kdb_buffer);
675 if (!dbg_kdb_mode && kgdb_connected) {
676 gdbstub_msg_write(kdb_buffer, retlen);
677 } else {
678 if (!dbg_io_ops->is_console) {
679 len = strlen(kdb_buffer);
680 cp = kdb_buffer;
681 while (len--) {
682 dbg_io_ops->write_char(*cp);
683 cp++;
684 }
685 }
686 while (c) {
687 c->write(c, kdb_buffer, retlen);
688 touch_nmi_watchdog();
689 c = c->next;
690 }
691 }
692 if (logging) {
693 saved_loglevel = console_loglevel;
694 console_loglevel = 0;
695 printk(KERN_INFO "%s", kdb_buffer);
696 }
697
698 if (KDB_STATE(PAGER) && strchr(kdb_buffer, '\n'))
699 kdb_nextline++;
700
701 /* check for having reached the LINES number of printed lines */
702 if (kdb_nextline == linecount) {
703 char buf1[16] = "";
704#if defined(CONFIG_SMP)
705 char buf2[32];
706#endif
707
708 /* Watch out for recursion here. Any routine that calls
709 * kdb_printf will come back through here. And kdb_read
710 * uses kdb_printf to echo on serial consoles ...
711 */
712 kdb_nextline = 1; /* In case of recursion */
713
714 /*
715 * Pause until cr.
716 */
717 moreprompt = kdbgetenv("MOREPROMPT");
718 if (moreprompt == NULL)
719 moreprompt = "more> ";
720
721#if defined(CONFIG_SMP)
722 if (strchr(moreprompt, '%')) {
723 sprintf(buf2, moreprompt, get_cpu());
724 put_cpu();
725 moreprompt = buf2;
726 }
727#endif
728
729 kdb_input_flush();
730 c = console_drivers;
731
732 if (!dbg_io_ops->is_console) {
733 len = strlen(moreprompt);
734 cp = moreprompt;
735 while (len--) {
736 dbg_io_ops->write_char(*cp);
737 cp++;
738 }
739 }
740 while (c) {
741 c->write(c, moreprompt, strlen(moreprompt));
742 touch_nmi_watchdog();
743 c = c->next;
744 }
745
746 if (logging)
747 printk("%s", moreprompt);
748
749 kdb_read(buf1, 2); /* '2' indicates to return
750 * immediately after getting one key. */
751 kdb_nextline = 1; /* Really set output line 1 */
752
753 /* empty and reset the buffer: */
754 kdb_buffer[0] = '\0';
755 next_avail = kdb_buffer;
756 size_avail = sizeof(kdb_buffer);
757 if ((buf1[0] == 'q') || (buf1[0] == 'Q')) {
758 /* user hit q or Q */
759 KDB_FLAG_SET(CMD_INTERRUPT); /* command interrupted */
760 KDB_STATE_CLEAR(PAGER);
761 /* end of command output; back to normal mode */
762 kdb_grepping_flag = 0;
763 kdb_printf("\n");
764 } else if (buf1[0] == ' ') {
765 kdb_printf("\n");
766 suspend_grep = 1; /* for this recursion */
767 } else if (buf1[0] == '\n') {
768 kdb_nextline = linecount - 1;
769 kdb_printf("\r");
770 suspend_grep = 1; /* for this recursion */
771 } else if (buf1[0] && buf1[0] != '\n') {
772 /* user hit something other than enter */
773 suspend_grep = 1; /* for this recursion */
774 kdb_printf("\nOnly 'q' or 'Q' are processed at more "
775 "prompt, input ignored\n");
776 } else if (kdb_grepping_flag) {
777 /* user hit enter */
778 suspend_grep = 1; /* for this recursion */
779 kdb_printf("\n");
780 }
781 kdb_input_flush();
782 }
783
784 /*
785 * For grep searches, shift the printed string left.
786 * replaced_byte contains the character that was overwritten with
787 * the terminating null, and cphold points to the null.
788 * Then adjust the notion of available space in the buffer.
789 */
790 if (kdb_grepping_flag && !suspend_grep) {
791 *cphold = replaced_byte;
792 strcpy(kdb_buffer, cphold);
793 len = strlen(kdb_buffer);
794 next_avail = kdb_buffer + len;
795 size_avail = sizeof(kdb_buffer) - len;
796 }
797
798kdb_print_out:
799 suspend_grep = 0; /* end of what may have been a recursive call */
800 if (logging)
801 console_loglevel = saved_loglevel;
802 if (KDB_STATE(PRINTF_LOCK) && got_printf_lock) {
803 got_printf_lock = 0;
804 spin_unlock_irqrestore(&kdb_printf_lock, flags);
805 KDB_STATE_CLEAR(PRINTF_LOCK);
806 atomic_dec(&kdb_event);
807 } else {
808 __release(kdb_printf_lock);
809 }
810 kdb_trap_printk = saved_trap_printk;
811 preempt_enable();
812 return retlen;
813}
814
815int kdb_printf(const char *fmt, ...)
816{
817 va_list ap;
818 int r;
819
820 va_start(ap, fmt);
821 r = vkdb_printf(fmt, ap);
822 va_end(ap);
823
824 return r;
825}
826
generated by cgit v1.2.2 (git 2.25.0) at 2025-01-04 13:23:44 -0500