This source file includes following definitions.
- kgdb_transition_check
- kdb_read_get_key
- kdb_read
- kdb_getstr
- kdb_input_flush
- kdb_search_string
- vkdb_printf
- kdb_printf
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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
30 char kdb_prompt_str[CMD_BUFLEN];
31
32 int kdb_trap_printk;
33 int kdb_printf_cpu = -1;
34
35 static 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
52 static int kdb_read_get_key(char *buffer, size_t bufsize)
53 {
54 #define ESCAPE_UDELAY 1000
55 #define ESCAPE_DELAY (2*1000000/ESCAPE_UDELAY)
56 char escape_data[5];
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
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
107 continue;
108 } else if (ped - escape_data == 2) {
109
110 if (key != '[')
111 escape_delay = 2;
112 continue;
113 } else if (ped - escape_data == 3) {
114
115 int mapkey = 0;
116 switch (key) {
117 case 'A':
118 mapkey = 16;
119 break;
120 case 'B':
121 mapkey = 14;
122 break;
123 case 'C':
124 mapkey = 6;
125 break;
126 case 'D':
127 mapkey = 2;
128 break;
129 case '1':
130 case '3':
131
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
146 int mapkey = 0;
147 if (key == '~') {
148 switch (escape_data[2]) {
149 case '1':
150 mapkey = 1;
151 break;
152 case '3':
153 mapkey = 4;
154 break;
155 case '4':
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;
169 }
170 return key;
171 }
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204 static char *kdb_read(char *buffer, size_t bufsize)
205 {
206 char *cp = buffer;
207 char *bufend = buffer+bufsize-2;
208
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);
235 poll_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:
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:
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:
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:
281 if (cp > buffer) {
282 kdb_printf("\r");
283 kdb_printf(kdb_prompt_str);
284 cp = buffer;
285 }
286 break;
287 case 5:
288 if (cp < lastchar) {
289 kdb_printf("%s", cp);
290 cp = lastchar;
291 }
292 break;
293 case 2:
294 if (cp > buffer) {
295 kdb_printf("\b");
296 --cp;
297 }
298 break;
299 case 14:
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:
309 if (cp < lastchar) {
310 kdb_printf("%c", *cp);
311 ++cp;
312 }
313 break;
314 case 16:
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:
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;
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
396
397
398
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
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 }
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446 char *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;
452 return kdb_read(buffer, bufsize);
453 }
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472 static 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--;
479 empty:
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 }
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514 static char kdb_buffer[256];
515 static char *next_avail = kdb_buffer;
516 static int size_avail;
517 static int suspend_grep;
518
519
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521
522
523
524
525 static int kdb_search_string(char *searched, char *searchfor)
526 {
527 char firstchar, *cp;
528 int len1, len2;
529
530
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
555 int 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
570
571
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
597 next_avail = kdb_buffer;
598 size_avail = sizeof(kdb_buffer);
599 }
600 vsnprintf(next_avail, size_avail, fmt, ap);
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605
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609
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611 if (!suspend_grep && kdb_grepping_flag) {
612 cp = strchr(kdb_buffer, '\n');
613 if (!cp) {
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622
623
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625
626
627 if (next_avail == kdb_buffer) {
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629
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631
632
633 cp2 = kdb_buffer;
634 len = strlen(kdb_prompt_str);
635 if (!strncmp(cp2, kdb_prompt_str, len)) {
636
637
638
639
640
641 kdb_grepping_flag = 0;
642 goto kdb_printit;
643 }
644 }
645
646
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
655
656
657 cp++;
658 replaced_byte = *cp;
659 cphold = cp;
660 *cp = '\0';
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662
663
664
665
666
667 fnd = kdb_search_string(kdb_buffer, kdb_grep_string);
668 if (!fnd) {
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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
685
686
687 kdb_grepping_flag = 0;
688
689
690
691
692 }
693 kdb_printit:
694
695
696
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
729
730
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
748 if (kdb_nextline >= linecount) {
749 char buf1[16] = "";
750
751
752
753
754
755 kdb_nextline = 1;
756
757
758
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);
785
786 kdb_nextline = 1;
787
788
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
794 KDB_FLAG_SET(CMD_INTERRUPT);
795 KDB_STATE_CLEAR(PAGER);
796
797 kdb_grepping_flag = 0;
798 kdb_printf("\n");
799 } else if (buf1[0] == ' ') {
800 kdb_printf("\r");
801 suspend_grep = 1;
802 } else if (buf1[0] == '\n') {
803 kdb_nextline = linecount - 1;
804 kdb_printf("\r");
805 suspend_grep = 1;
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;
813 } else if (buf1[0] && buf1[0] != '\n') {
814
815 suspend_grep = 1;
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
825 suspend_grep = 1;
826 kdb_printf("\n");
827 }
828 kdb_input_flush();
829 }
830
831
832
833
834
835
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
845 kdb_print_out:
846 suspend_grep = 0;
847 if (logging)
848 console_loglevel = saved_loglevel;
849
850 smp_store_release(&kdb_printf_cpu, old_cpu);
851 local_irq_restore(flags);
852 return retlen;
853 }
854
855 int 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 }
866 EXPORT_SYMBOL_GPL(kdb_printf);