Commit | Line | Data |
---|---|---|
5d5314d6 JW |
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> | |
a0de055c | 24 | #include <linux/kgdb.h> |
5d5314d6 JW |
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 | ||
d37d39ae | 32 | int kdb_trap_printk; |
34aaff40 | 33 | int kdb_printf_cpu = -1; |
5d5314d6 | 34 | |
37f86b46 | 35 | static int kgdb_transition_check(char *buffer) |
5d5314d6 | 36 | { |
37f86b46 | 37 | if (buffer[0] != '+' && buffer[0] != '$') { |
5d5314d6 JW |
38 | KDB_STATE_SET(KGDB_TRANS); |
39 | kdb_printf("%s", buffer); | |
37f86b46 JW |
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 | } | |
5d5314d6 | 48 | } |
37f86b46 | 49 | return 0; |
5d5314d6 JW |
50 | } |
51 | ||
53b63136 DT |
52 | /** |
53 | * kdb_handle_escape() - validity check on an accumulated escape sequence. | |
54 | * @buf: Accumulated escape characters to be examined. Note that buf | |
55 | * is not a string, it is an array of characters and need not be | |
56 | * nil terminated. | |
57 | * @sz: Number of accumulated escape characters. | |
58 | * | |
59 | * Return: -1 if the escape sequence is unwanted, 0 if it is incomplete, | |
60 | * otherwise it returns a mapped key value to pass to the upper layers. | |
61 | */ | |
62 | static int kdb_handle_escape(char *buf, size_t sz) | |
63 | { | |
64 | char *lastkey = buf + sz - 1; | |
65 | ||
66 | switch (sz) { | |
67 | case 1: | |
68 | if (*lastkey == '\e') | |
69 | return 0; | |
70 | break; | |
71 | ||
72 | case 2: /* \e<something> */ | |
73 | if (*lastkey == '[') | |
74 | return 0; | |
75 | break; | |
76 | ||
77 | case 3: | |
78 | switch (*lastkey) { | |
79 | case 'A': /* \e[A, up arrow */ | |
80 | return 16; | |
81 | case 'B': /* \e[B, down arrow */ | |
82 | return 14; | |
83 | case 'C': /* \e[C, right arrow */ | |
84 | return 6; | |
85 | case 'D': /* \e[D, left arrow */ | |
86 | return 2; | |
87 | case '1': /* \e[<1,3,4>], may be home, del, end */ | |
88 | case '3': | |
89 | case '4': | |
90 | return 0; | |
91 | } | |
92 | break; | |
93 | ||
94 | case 4: | |
95 | if (*lastkey == '~') { | |
96 | switch (buf[2]) { | |
97 | case '1': /* \e[1~, home */ | |
98 | return 1; | |
99 | case '3': /* \e[3~, del */ | |
100 | return 4; | |
101 | case '4': /* \e[4~, end */ | |
102 | return 5; | |
103 | } | |
104 | } | |
105 | break; | |
106 | } | |
107 | ||
108 | return -1; | |
109 | } | |
110 | ||
4f27e824 DT |
111 | /** |
112 | * kdb_getchar() - Read a single character from a kdb console (or consoles). | |
113 | * | |
114 | * Other than polling the various consoles that are currently enabled, | |
115 | * most of the work done in this function is dealing with escape sequences. | |
116 | * | |
117 | * An escape key could be the start of a vt100 control sequence such as \e[D | |
118 | * (left arrow) or it could be a character in its own right. The standard | |
119 | * method for detecting the difference is to wait for 2 seconds to see if there | |
120 | * are any other characters. kdb is complicated by the lack of a timer service | |
121 | * (interrupts are off), by multiple input sources. Escape sequence processing | |
122 | * has to be done as states in the polling loop. | |
123 | * | |
124 | * Return: The key pressed or a control code derived from an escape sequence. | |
125 | */ | |
126 | char kdb_getchar(void) | |
5d5314d6 JW |
127 | { |
128 | #define ESCAPE_UDELAY 1000 | |
129 | #define ESCAPE_DELAY (2*1000000/ESCAPE_UDELAY) /* 2 seconds worth of udelays */ | |
cdca8d89 DT |
130 | char buf[4]; /* longest vt100 escape sequence is 4 bytes */ |
131 | char *pbuf = buf; | |
5d5314d6 | 132 | int escape_delay = 0; |
cdca8d89 | 133 | get_char_func *f, *f_prev = NULL; |
5d5314d6 JW |
134 | int key; |
135 | ||
136 | for (f = &kdb_poll_funcs[0]; ; ++f) { | |
137 | if (*f == NULL) { | |
138 | /* Reset NMI watchdog once per poll loop */ | |
139 | touch_nmi_watchdog(); | |
140 | f = &kdb_poll_funcs[0]; | |
141 | } | |
d04213af | 142 | |
5d5314d6 JW |
143 | key = (*f)(); |
144 | if (key == -1) { | |
145 | if (escape_delay) { | |
146 | udelay(ESCAPE_UDELAY); | |
d04213af DT |
147 | if (--escape_delay == 0) |
148 | return '\e'; | |
5d5314d6 JW |
149 | } |
150 | continue; | |
151 | } | |
d04213af | 152 | |
cdca8d89 DT |
153 | /* |
154 | * When the first character is received (or we get a change | |
155 | * input source) we set ourselves up to handle an escape | |
156 | * sequences (just in case). | |
157 | */ | |
158 | if (f_prev != f) { | |
159 | f_prev = f; | |
160 | pbuf = buf; | |
5d5314d6 | 161 | escape_delay = ESCAPE_DELAY; |
5d5314d6 | 162 | } |
d04213af | 163 | |
cdca8d89 DT |
164 | *pbuf++ = key; |
165 | key = kdb_handle_escape(buf, pbuf - buf); | |
c58ff643 DT |
166 | if (key < 0) /* no escape sequence; return best character */ |
167 | return buf[pbuf - buf == 2 ? 1 : 0]; | |
cdca8d89 DT |
168 | if (key > 0) |
169 | return key; | |
5d5314d6 | 170 | } |
cdca8d89 DT |
171 | |
172 | unreachable(); | |
5d5314d6 JW |
173 | } |
174 | ||
175 | /* | |
176 | * kdb_read | |
177 | * | |
178 | * This function reads a string of characters, terminated by | |
179 | * a newline, or by reaching the end of the supplied buffer, | |
180 | * from the current kernel debugger console device. | |
181 | * Parameters: | |
182 | * buffer - Address of character buffer to receive input characters. | |
183 | * bufsize - size, in bytes, of the character buffer | |
184 | * Returns: | |
185 | * Returns a pointer to the buffer containing the received | |
186 | * character string. This string will be terminated by a | |
187 | * newline character. | |
188 | * Locking: | |
189 | * No locks are required to be held upon entry to this | |
190 | * function. It is not reentrant - it relies on the fact | |
191 | * that while kdb is running on only one "master debug" cpu. | |
192 | * Remarks: | |
4f27e824 | 193 | * The buffer size must be >= 2. |
5d5314d6 JW |
194 | */ |
195 | ||
196 | static char *kdb_read(char *buffer, size_t bufsize) | |
197 | { | |
198 | char *cp = buffer; | |
199 | char *bufend = buffer+bufsize-2; /* Reserve space for newline | |
200 | * and null byte */ | |
201 | char *lastchar; | |
202 | char *p_tmp; | |
203 | char tmp; | |
204 | static char tmpbuffer[CMD_BUFLEN]; | |
205 | int len = strlen(buffer); | |
206 | int len_tmp; | |
207 | int tab = 0; | |
208 | int count; | |
209 | int i; | |
210 | int diag, dtab_count; | |
c2b94c72 | 211 | int key, buf_size, ret; |
5d5314d6 JW |
212 | |
213 | ||
214 | diag = kdbgetintenv("DTABCOUNT", &dtab_count); | |
215 | if (diag) | |
216 | dtab_count = 30; | |
217 | ||
218 | if (len > 0) { | |
219 | cp += len; | |
220 | if (*(buffer+len-1) == '\n') | |
221 | cp--; | |
222 | } | |
223 | ||
224 | lastchar = cp; | |
225 | *cp = '\0'; | |
226 | kdb_printf("%s", buffer); | |
227 | poll_again: | |
4f27e824 | 228 | key = kdb_getchar(); |
5d5314d6 JW |
229 | if (key != 9) |
230 | tab = 0; | |
231 | switch (key) { | |
232 | case 8: /* backspace */ | |
233 | if (cp > buffer) { | |
234 | if (cp < lastchar) { | |
235 | memcpy(tmpbuffer, cp, lastchar - cp); | |
236 | memcpy(cp-1, tmpbuffer, lastchar - cp); | |
237 | } | |
238 | *(--lastchar) = '\0'; | |
239 | --cp; | |
240 | kdb_printf("\b%s \r", cp); | |
241 | tmp = *cp; | |
242 | *cp = '\0'; | |
243 | kdb_printf(kdb_prompt_str); | |
244 | kdb_printf("%s", buffer); | |
245 | *cp = tmp; | |
246 | } | |
247 | break; | |
248 | case 13: /* enter */ | |
249 | *lastchar++ = '\n'; | |
250 | *lastchar++ = '\0'; | |
37f86b46 JW |
251 | if (!KDB_STATE(KGDB_TRANS)) { |
252 | KDB_STATE_SET(KGDB_TRANS); | |
253 | kdb_printf("%s", buffer); | |
254 | } | |
5d5314d6 JW |
255 | kdb_printf("\n"); |
256 | return buffer; | |
257 | case 4: /* Del */ | |
258 | if (cp < lastchar) { | |
259 | memcpy(tmpbuffer, cp+1, lastchar - cp - 1); | |
260 | memcpy(cp, tmpbuffer, lastchar - cp - 1); | |
261 | *(--lastchar) = '\0'; | |
262 | kdb_printf("%s \r", cp); | |
263 | tmp = *cp; | |
264 | *cp = '\0'; | |
265 | kdb_printf(kdb_prompt_str); | |
266 | kdb_printf("%s", buffer); | |
267 | *cp = tmp; | |
268 | } | |
269 | break; | |
270 | case 1: /* Home */ | |
271 | if (cp > buffer) { | |
272 | kdb_printf("\r"); | |
273 | kdb_printf(kdb_prompt_str); | |
274 | cp = buffer; | |
275 | } | |
276 | break; | |
277 | case 5: /* End */ | |
278 | if (cp < lastchar) { | |
279 | kdb_printf("%s", cp); | |
280 | cp = lastchar; | |
281 | } | |
282 | break; | |
283 | case 2: /* Left */ | |
284 | if (cp > buffer) { | |
285 | kdb_printf("\b"); | |
286 | --cp; | |
287 | } | |
288 | break; | |
289 | case 14: /* Down */ | |
290 | memset(tmpbuffer, ' ', | |
291 | strlen(kdb_prompt_str) + (lastchar-buffer)); | |
292 | *(tmpbuffer+strlen(kdb_prompt_str) + | |
293 | (lastchar-buffer)) = '\0'; | |
294 | kdb_printf("\r%s\r", tmpbuffer); | |
295 | *lastchar = (char)key; | |
296 | *(lastchar+1) = '\0'; | |
297 | return lastchar; | |
298 | case 6: /* Right */ | |
299 | if (cp < lastchar) { | |
300 | kdb_printf("%c", *cp); | |
301 | ++cp; | |
302 | } | |
303 | break; | |
304 | case 16: /* Up */ | |
305 | memset(tmpbuffer, ' ', | |
306 | strlen(kdb_prompt_str) + (lastchar-buffer)); | |
307 | *(tmpbuffer+strlen(kdb_prompt_str) + | |
308 | (lastchar-buffer)) = '\0'; | |
309 | kdb_printf("\r%s\r", tmpbuffer); | |
310 | *lastchar = (char)key; | |
311 | *(lastchar+1) = '\0'; | |
312 | return lastchar; | |
313 | case 9: /* Tab */ | |
314 | if (tab < 2) | |
315 | ++tab; | |
316 | p_tmp = buffer; | |
317 | while (*p_tmp == ' ') | |
318 | p_tmp++; | |
319 | if (p_tmp > cp) | |
320 | break; | |
321 | memcpy(tmpbuffer, p_tmp, cp-p_tmp); | |
322 | *(tmpbuffer + (cp-p_tmp)) = '\0'; | |
323 | p_tmp = strrchr(tmpbuffer, ' '); | |
324 | if (p_tmp) | |
325 | ++p_tmp; | |
326 | else | |
327 | p_tmp = tmpbuffer; | |
328 | len = strlen(p_tmp); | |
c2b94c72 PB |
329 | buf_size = sizeof(tmpbuffer) - (p_tmp - tmpbuffer); |
330 | count = kallsyms_symbol_complete(p_tmp, buf_size); | |
5d5314d6 JW |
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++) { | |
c2b94c72 PB |
342 | ret = kallsyms_symbol_next(p_tmp, i, buf_size); |
343 | if (WARN_ON(!ret)) | |
5d5314d6 | 344 | break; |
c2b94c72 PB |
345 | if (ret != -E2BIG) |
346 | kdb_printf("%s ", p_tmp); | |
347 | else | |
348 | kdb_printf("%s... ", p_tmp); | |
5d5314d6 JW |
349 | *(p_tmp + len) = '\0'; |
350 | } | |
351 | if (i >= dtab_count) | |
352 | kdb_printf("..."); | |
353 | kdb_printf("\n"); | |
354 | kdb_printf(kdb_prompt_str); | |
355 | kdb_printf("%s", buffer); | |
356 | } else if (tab != 2 && count > 0) { | |
357 | len_tmp = strlen(p_tmp); | |
358 | strncpy(p_tmp+len_tmp, cp, lastchar-cp+1); | |
359 | len_tmp = strlen(p_tmp); | |
360 | strncpy(cp, p_tmp+len, len_tmp-len + 1); | |
361 | len = len_tmp - len; | |
362 | kdb_printf("%s", cp); | |
363 | cp += len; | |
364 | lastchar += len; | |
365 | } | |
366 | kdb_nextline = 1; /* reset output line number */ | |
367 | break; | |
368 | default: | |
369 | if (key >= 32 && lastchar < bufend) { | |
370 | if (cp < lastchar) { | |
371 | memcpy(tmpbuffer, cp, lastchar - cp); | |
372 | memcpy(cp+1, tmpbuffer, lastchar - cp); | |
373 | *++lastchar = '\0'; | |
374 | *cp = key; | |
375 | kdb_printf("%s\r", cp); | |
376 | ++cp; | |
377 | tmp = *cp; | |
378 | *cp = '\0'; | |
379 | kdb_printf(kdb_prompt_str); | |
380 | kdb_printf("%s", buffer); | |
381 | *cp = tmp; | |
382 | } else { | |
383 | *++lastchar = '\0'; | |
384 | *cp++ = key; | |
385 | /* The kgdb transition check will hide | |
386 | * printed characters if we think that | |
387 | * kgdb is connecting, until the check | |
388 | * fails */ | |
37f86b46 JW |
389 | if (!KDB_STATE(KGDB_TRANS)) { |
390 | if (kgdb_transition_check(buffer)) | |
391 | return buffer; | |
392 | } else { | |
5d5314d6 | 393 | kdb_printf("%c", key); |
37f86b46 | 394 | } |
5d5314d6 JW |
395 | } |
396 | /* Special escape to kgdb */ | |
397 | if (lastchar - buffer >= 5 && | |
398 | strcmp(lastchar - 5, "$?#3f") == 0) { | |
f679c498 | 399 | kdb_gdb_state_pass(lastchar - 5); |
5d5314d6 JW |
400 | strcpy(buffer, "kgdb"); |
401 | KDB_STATE_SET(DOING_KGDB); | |
402 | return buffer; | |
403 | } | |
f679c498 JW |
404 | if (lastchar - buffer >= 11 && |
405 | strcmp(lastchar - 11, "$qSupported") == 0) { | |
406 | kdb_gdb_state_pass(lastchar - 11); | |
5d5314d6 | 407 | strcpy(buffer, "kgdb"); |
d613d828 | 408 | KDB_STATE_SET(DOING_KGDB); |
5d5314d6 JW |
409 | return buffer; |
410 | } | |
411 | } | |
412 | break; | |
413 | } | |
414 | goto poll_again; | |
415 | } | |
416 | ||
417 | /* | |
418 | * kdb_getstr | |
419 | * | |
420 | * Print the prompt string and read a command from the | |
421 | * input device. | |
422 | * | |
423 | * Parameters: | |
424 | * buffer Address of buffer to receive command | |
425 | * bufsize Size of buffer in bytes | |
426 | * prompt Pointer to string to use as prompt string | |
427 | * Returns: | |
428 | * Pointer to command buffer. | |
429 | * Locking: | |
430 | * None. | |
431 | * Remarks: | |
432 | * For SMP kernels, the processor number will be | |
433 | * substituted for %d, %x or %o in the prompt. | |
434 | */ | |
435 | ||
32d375f6 | 436 | char *kdb_getstr(char *buffer, size_t bufsize, const char *prompt) |
5d5314d6 JW |
437 | { |
438 | if (prompt && kdb_prompt_str != prompt) | |
ca976bfb | 439 | strscpy(kdb_prompt_str, prompt, CMD_BUFLEN); |
5d5314d6 JW |
440 | kdb_printf(kdb_prompt_str); |
441 | kdb_nextline = 1; /* Prompt and input resets line number */ | |
442 | return kdb_read(buffer, bufsize); | |
443 | } | |
444 | ||
445 | /* | |
446 | * kdb_input_flush | |
447 | * | |
448 | * Get rid of any buffered console input. | |
449 | * | |
450 | * Parameters: | |
451 | * none | |
452 | * Returns: | |
453 | * nothing | |
454 | * Locking: | |
455 | * none | |
456 | * Remarks: | |
457 | * Call this function whenever you want to flush input. If there is any | |
458 | * outstanding input, it ignores all characters until there has been no | |
459 | * data for approximately 1ms. | |
460 | */ | |
461 | ||
462 | static void kdb_input_flush(void) | |
463 | { | |
464 | get_char_func *f; | |
465 | int res; | |
466 | int flush_delay = 1; | |
467 | while (flush_delay) { | |
468 | flush_delay--; | |
469 | empty: | |
470 | touch_nmi_watchdog(); | |
471 | for (f = &kdb_poll_funcs[0]; *f; ++f) { | |
472 | res = (*f)(); | |
473 | if (res != -1) { | |
474 | flush_delay = 1; | |
475 | goto empty; | |
476 | } | |
477 | } | |
478 | if (flush_delay) | |
479 | mdelay(1); | |
480 | } | |
481 | } | |
482 | ||
483 | /* | |
484 | * kdb_printf | |
485 | * | |
486 | * Print a string to the output device(s). | |
487 | * | |
488 | * Parameters: | |
489 | * printf-like format and optional args. | |
490 | * Returns: | |
491 | * 0 | |
492 | * Locking: | |
493 | * None. | |
494 | * Remarks: | |
495 | * use 'kdbcons->write()' to avoid polluting 'log_buf' with | |
496 | * kdb output. | |
497 | * | |
498 | * If the user is doing a cmd args | grep srch | |
499 | * then kdb_grepping_flag is set. | |
500 | * In that case we need to accumulate full lines (ending in \n) before | |
501 | * searching for the pattern. | |
502 | */ | |
503 | ||
504 | static char kdb_buffer[256]; /* A bit too big to go on stack */ | |
505 | static char *next_avail = kdb_buffer; | |
506 | static int size_avail; | |
507 | static int suspend_grep; | |
508 | ||
509 | /* | |
510 | * search arg1 to see if it contains arg2 | |
511 | * (kdmain.c provides flags for ^pat and pat$) | |
512 | * | |
513 | * return 1 for found, 0 for not found | |
514 | */ | |
515 | static int kdb_search_string(char *searched, char *searchfor) | |
516 | { | |
517 | char firstchar, *cp; | |
518 | int len1, len2; | |
519 | ||
520 | /* not counting the newline at the end of "searched" */ | |
521 | len1 = strlen(searched)-1; | |
522 | len2 = strlen(searchfor); | |
523 | if (len1 < len2) | |
524 | return 0; | |
525 | if (kdb_grep_leading && kdb_grep_trailing && len1 != len2) | |
526 | return 0; | |
527 | if (kdb_grep_leading) { | |
528 | if (!strncmp(searched, searchfor, len2)) | |
529 | return 1; | |
530 | } else if (kdb_grep_trailing) { | |
531 | if (!strncmp(searched+len1-len2, searchfor, len2)) | |
532 | return 1; | |
533 | } else { | |
534 | firstchar = *searchfor; | |
535 | cp = searched; | |
536 | while ((cp = strchr(cp, firstchar))) { | |
537 | if (!strncmp(cp, searchfor, len2)) | |
538 | return 1; | |
539 | cp++; | |
540 | } | |
541 | } | |
542 | return 0; | |
543 | } | |
544 | ||
9d71b344 SG |
545 | static void kdb_msg_write(const char *msg, int msg_len) |
546 | { | |
547 | struct console *c; | |
548 | ||
549 | if (msg_len == 0) | |
550 | return; | |
551 | ||
5946d1f5 | 552 | if (dbg_io_ops) { |
9d71b344 SG |
553 | const char *cp = msg; |
554 | int len = msg_len; | |
555 | ||
556 | while (len--) { | |
557 | dbg_io_ops->write_char(*cp); | |
558 | cp++; | |
559 | } | |
560 | } | |
561 | ||
562 | for_each_console(c) { | |
e8857288 SG |
563 | if (!(c->flags & CON_ENABLED)) |
564 | continue; | |
5946d1f5 SG |
565 | if (c == dbg_io_ops->cons) |
566 | continue; | |
2a78b85b SG |
567 | /* |
568 | * Set oops_in_progress to encourage the console drivers to | |
569 | * disregard their internal spin locks: in the current calling | |
570 | * context the risk of deadlock is a bigger problem than risks | |
571 | * due to re-entering the console driver. We operate directly on | |
572 | * oops_in_progress rather than using bust_spinlocks() because | |
573 | * the calls bust_spinlocks() makes on exit are not appropriate | |
574 | * for this calling context. | |
575 | */ | |
576 | ++oops_in_progress; | |
9d71b344 | 577 | c->write(c, msg, msg_len); |
2a78b85b | 578 | --oops_in_progress; |
9d71b344 SG |
579 | touch_nmi_watchdog(); |
580 | } | |
581 | } | |
582 | ||
f7d4ca8b | 583 | int vkdb_printf(enum kdb_msgsrc src, const char *fmt, va_list ap) |
5d5314d6 | 584 | { |
5d5314d6 JW |
585 | int diag; |
586 | int linecount; | |
17b572e8 | 587 | int colcount; |
5d5314d6 | 588 | int logging, saved_loglevel = 0; |
5d5314d6 JW |
589 | int retlen = 0; |
590 | int fnd, len; | |
d5d8d3d0 | 591 | int this_cpu, old_cpu; |
5d5314d6 JW |
592 | char *cp, *cp2, *cphold = NULL, replaced_byte = ' '; |
593 | char *moreprompt = "more> "; | |
5d5314d6 JW |
594 | unsigned long uninitialized_var(flags); |
595 | ||
5d5314d6 JW |
596 | /* Serialize kdb_printf if multiple cpus try to write at once. |
597 | * But if any cpu goes recursive in kdb, just print the output, | |
598 | * even if it is interleaved with any other text. | |
599 | */ | |
34aaff40 | 600 | local_irq_save(flags); |
d5d8d3d0 PM |
601 | this_cpu = smp_processor_id(); |
602 | for (;;) { | |
603 | old_cpu = cmpxchg(&kdb_printf_cpu, -1, this_cpu); | |
604 | if (old_cpu == -1 || old_cpu == this_cpu) | |
605 | break; | |
606 | ||
607 | cpu_relax(); | |
5d5314d6 JW |
608 | } |
609 | ||
610 | diag = kdbgetintenv("LINES", &linecount); | |
611 | if (diag || linecount <= 1) | |
612 | linecount = 24; | |
613 | ||
17b572e8 JW |
614 | diag = kdbgetintenv("COLUMNS", &colcount); |
615 | if (diag || colcount <= 1) | |
616 | colcount = 80; | |
617 | ||
5d5314d6 JW |
618 | diag = kdbgetintenv("LOGGING", &logging); |
619 | if (diag) | |
620 | logging = 0; | |
621 | ||
622 | if (!kdb_grepping_flag || suspend_grep) { | |
623 | /* normally, every vsnprintf starts a new buffer */ | |
624 | next_avail = kdb_buffer; | |
625 | size_avail = sizeof(kdb_buffer); | |
626 | } | |
5d5314d6 | 627 | vsnprintf(next_avail, size_avail, fmt, ap); |
5d5314d6 JW |
628 | |
629 | /* | |
630 | * If kdb_parse() found that the command was cmd xxx | grep yyy | |
631 | * then kdb_grepping_flag is set, and kdb_grep_string contains yyy | |
632 | * | |
633 | * Accumulate the print data up to a newline before searching it. | |
634 | * (vsnprintf does null-terminate the string that it generates) | |
635 | */ | |
636 | ||
637 | /* skip the search if prints are temporarily unconditional */ | |
638 | if (!suspend_grep && kdb_grepping_flag) { | |
639 | cp = strchr(kdb_buffer, '\n'); | |
640 | if (!cp) { | |
641 | /* | |
642 | * Special cases that don't end with newlines | |
643 | * but should be written without one: | |
644 | * The "[nn]kdb> " prompt should | |
645 | * appear at the front of the buffer. | |
646 | * | |
647 | * The "[nn]more " prompt should also be | |
648 | * (MOREPROMPT -> moreprompt) | |
649 | * written * but we print that ourselves, | |
650 | * we set the suspend_grep flag to make | |
651 | * it unconditional. | |
652 | * | |
653 | */ | |
654 | if (next_avail == kdb_buffer) { | |
655 | /* | |
656 | * these should occur after a newline, | |
657 | * so they will be at the front of the | |
658 | * buffer | |
659 | */ | |
660 | cp2 = kdb_buffer; | |
661 | len = strlen(kdb_prompt_str); | |
662 | if (!strncmp(cp2, kdb_prompt_str, len)) { | |
663 | /* | |
664 | * We're about to start a new | |
665 | * command, so we can go back | |
666 | * to normal mode. | |
667 | */ | |
668 | kdb_grepping_flag = 0; | |
669 | goto kdb_printit; | |
670 | } | |
671 | } | |
672 | /* no newline; don't search/write the buffer | |
673 | until one is there */ | |
674 | len = strlen(kdb_buffer); | |
675 | next_avail = kdb_buffer + len; | |
676 | size_avail = sizeof(kdb_buffer) - len; | |
677 | goto kdb_print_out; | |
678 | } | |
679 | ||
680 | /* | |
681 | * The newline is present; print through it or discard | |
682 | * it, depending on the results of the search. | |
683 | */ | |
684 | cp++; /* to byte after the newline */ | |
685 | replaced_byte = *cp; /* remember what/where it was */ | |
686 | cphold = cp; | |
687 | *cp = '\0'; /* end the string for our search */ | |
688 | ||
689 | /* | |
690 | * We now have a newline at the end of the string | |
691 | * Only continue with this output if it contains the | |
692 | * search string. | |
693 | */ | |
694 | fnd = kdb_search_string(kdb_buffer, kdb_grep_string); | |
695 | if (!fnd) { | |
696 | /* | |
697 | * At this point the complete line at the start | |
698 | * of kdb_buffer can be discarded, as it does | |
699 | * not contain what the user is looking for. | |
700 | * Shift the buffer left. | |
701 | */ | |
702 | *cphold = replaced_byte; | |
703 | strcpy(kdb_buffer, cphold); | |
704 | len = strlen(kdb_buffer); | |
705 | next_avail = kdb_buffer + len; | |
706 | size_avail = sizeof(kdb_buffer) - len; | |
707 | goto kdb_print_out; | |
708 | } | |
fb6daa75 DT |
709 | if (kdb_grepping_flag >= KDB_GREPPING_FLAG_SEARCH) |
710 | /* | |
711 | * This was a interactive search (using '/' at more | |
712 | * prompt) and it has completed. Clear the flag. | |
713 | */ | |
714 | kdb_grepping_flag = 0; | |
5d5314d6 JW |
715 | /* |
716 | * at this point the string is a full line and | |
717 | * should be printed, up to the null. | |
718 | */ | |
719 | } | |
720 | kdb_printit: | |
721 | ||
722 | /* | |
723 | * Write to all consoles. | |
724 | */ | |
725 | retlen = strlen(kdb_buffer); | |
49795757 | 726 | cp = (char *) printk_skip_headers(kdb_buffer); |
9d71b344 | 727 | if (!dbg_kdb_mode && kgdb_connected) |
f7d4ca8b | 728 | gdbstub_msg_write(cp, retlen - (cp - kdb_buffer)); |
9d71b344 SG |
729 | else |
730 | kdb_msg_write(cp, retlen - (cp - kdb_buffer)); | |
731 | ||
5d5314d6 JW |
732 | if (logging) { |
733 | saved_loglevel = console_loglevel; | |
a8fe19eb | 734 | console_loglevel = CONSOLE_LOGLEVEL_SILENT; |
f7d4ca8b DT |
735 | if (printk_get_level(kdb_buffer) || src == KDB_MSGSRC_PRINTK) |
736 | printk("%s", kdb_buffer); | |
737 | else | |
738 | pr_info("%s", kdb_buffer); | |
5d5314d6 JW |
739 | } |
740 | ||
17b572e8 JW |
741 | if (KDB_STATE(PAGER)) { |
742 | /* | |
743 | * Check printed string to decide how to bump the | |
744 | * kdb_nextline to control when the more prompt should | |
745 | * show up. | |
746 | */ | |
747 | int got = 0; | |
748 | len = retlen; | |
749 | while (len--) { | |
750 | if (kdb_buffer[len] == '\n') { | |
751 | kdb_nextline++; | |
752 | got = 0; | |
753 | } else if (kdb_buffer[len] == '\r') { | |
754 | got = 0; | |
755 | } else { | |
756 | got++; | |
757 | } | |
758 | } | |
759 | kdb_nextline += got / (colcount + 1); | |
760 | } | |
5d5314d6 JW |
761 | |
762 | /* check for having reached the LINES number of printed lines */ | |
17b572e8 | 763 | if (kdb_nextline >= linecount) { |
4f27e824 | 764 | char ch; |
5d5314d6 JW |
765 | |
766 | /* Watch out for recursion here. Any routine that calls | |
767 | * kdb_printf will come back through here. And kdb_read | |
768 | * uses kdb_printf to echo on serial consoles ... | |
769 | */ | |
770 | kdb_nextline = 1; /* In case of recursion */ | |
771 | ||
772 | /* | |
773 | * Pause until cr. | |
774 | */ | |
775 | moreprompt = kdbgetenv("MOREPROMPT"); | |
776 | if (moreprompt == NULL) | |
777 | moreprompt = "more> "; | |
778 | ||
5d5314d6 | 779 | kdb_input_flush(); |
9d71b344 | 780 | kdb_msg_write(moreprompt, strlen(moreprompt)); |
5d5314d6 JW |
781 | |
782 | if (logging) | |
783 | printk("%s", moreprompt); | |
784 | ||
4f27e824 | 785 | ch = kdb_getchar(); |
5d5314d6 JW |
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); | |
4f27e824 | 792 | if ((ch == 'q') || (ch == 'Q')) { |
5d5314d6 JW |
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"); | |
4f27e824 | 799 | } else if (ch == ' ') { |
17b572e8 | 800 | kdb_printf("\r"); |
5d5314d6 | 801 | suspend_grep = 1; /* for this recursion */ |
4f27e824 | 802 | } else if (ch == '\n' || ch == '\r') { |
5d5314d6 JW |
803 | kdb_nextline = linecount - 1; |
804 | kdb_printf("\r"); | |
805 | suspend_grep = 1; /* for this recursion */ | |
4f27e824 | 806 | } else if (ch == '/' && !kdb_grepping_flag) { |
fb6daa75 DT |
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 */ | |
4f27e824 DT |
813 | } else if (ch) { |
814 | /* user hit something unexpected */ | |
5d5314d6 | 815 | suspend_grep = 1; /* for this recursion */ |
4f27e824 | 816 | if (ch != '/') |
fb6daa75 DT |
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"); | |
5d5314d6 JW |
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 | ||
845 | kdb_print_out: | |
846 | suspend_grep = 0; /* end of what may have been a recursive call */ | |
847 | if (logging) | |
848 | console_loglevel = saved_loglevel; | |
d5d8d3d0 PM |
849 | /* kdb_printf_cpu locked the code above. */ |
850 | smp_store_release(&kdb_printf_cpu, old_cpu); | |
d5d8d3d0 | 851 | local_irq_restore(flags); |
5d5314d6 JW |
852 | return retlen; |
853 | } | |
d37d39ae JW |
854 | |
855 | int kdb_printf(const char *fmt, ...) | |
856 | { | |
857 | va_list ap; | |
858 | int r; | |
859 | ||
860 | va_start(ap, fmt); | |
f7d4ca8b | 861 | r = vkdb_printf(KDB_MSGSRC_INTERNAL, fmt, ap); |
d37d39ae JW |
862 | va_end(ap); |
863 | ||
864 | return r; | |
865 | } | |
f7030bbc | 866 | EXPORT_SYMBOL_GPL(kdb_printf); |