source: mainline/kernel/generic/src/console/kconsole.c@ 1ba41c5

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since 1ba41c5 was df4ed85, checked in by Jakub Jermar <jakub@…>, 18 years ago

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1/*
2 * Copyright (c) 2005 Jakub Jermar
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * - Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * - The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29/** @addtogroup genericconsole
30 * @{
31 */
32
33/**
34 * @file kconsole.c
35 * @brief Kernel console.
36 *
37 * This file contains kernel thread managing the kernel console.
38 */
39
40#include <console/kconsole.h>
41#include <console/console.h>
42#include <console/chardev.h>
43#include <console/cmd.h>
44#include <print.h>
45#include <panic.h>
46#include <typedefs.h>
47#include <arch/types.h>
48#include <adt/list.h>
49#include <arch.h>
50#include <macros.h>
51#include <debug.h>
52#include <func.h>
53#include <symtab.h>
54#include <macros.h>
55
56/** Simple kernel console.
57 *
58 * The console is realized by kernel thread kconsole.
59 * It doesn't understand any useful command on its own,
60 * but makes it possible for other kernel subsystems to
61 * register their own commands.
62 */
63
64/** Locking.
65 *
66 * There is a list of cmd_info_t structures. This list
67 * is protected by cmd_lock spinlock. Note that specially
68 * the link elements of cmd_info_t are protected by
69 * this lock.
70 *
71 * Each cmd_info_t also has its own lock, which protects
72 * all elements thereof except the link element.
73 *
74 * cmd_lock must be acquired before any cmd_info lock.
75 * When locking two cmd info structures, structure with
76 * lower address must be locked first.
77 */
78
79SPINLOCK_INITIALIZE(cmd_lock); /**< Lock protecting command list. */
80LIST_INITIALIZE(cmd_head); /**< Command list. */
81
82static cmd_info_t *parse_cmdline(char *cmdline, size_t len);
83static bool parse_argument(char *cmdline, size_t len, index_t *start, index_t *end);
84static char history[KCONSOLE_HISTORY][MAX_CMDLINE] = {};
85
86/** Initialize kconsole data structures. */
87void kconsole_init(void)
88{
89 int i;
90
91 cmd_init();
92 for (i=0; i<KCONSOLE_HISTORY; i++)
93 history[i][0] = '\0';
94}
95
96
97/** Register kconsole command.
98 *
99 * @param cmd Structure describing the command.
100 *
101 * @return 0 on failure, 1 on success.
102 */
103int cmd_register(cmd_info_t *cmd)
104{
105 link_t *cur;
106
107 spinlock_lock(&cmd_lock);
108
109 /*
110 * Make sure the command is not already listed.
111 */
112 for (cur = cmd_head.next; cur != &cmd_head; cur = cur->next) {
113 cmd_info_t *hlp;
114
115 hlp = list_get_instance(cur, cmd_info_t, link);
116
117 if (hlp == cmd) {
118 /* The command is already there. */
119 spinlock_unlock(&cmd_lock);
120 return 0;
121 }
122
123 /* Avoid deadlock. */
124 if (hlp < cmd) {
125 spinlock_lock(&hlp->lock);
126 spinlock_lock(&cmd->lock);
127 } else {
128 spinlock_lock(&cmd->lock);
129 spinlock_lock(&hlp->lock);
130 }
131 if ((strncmp(hlp->name,
132 cmd->name, max(strlen(cmd->name),
133 strlen(hlp->name))) == 0)) {
134 /* The command is already there. */
135 spinlock_unlock(&hlp->lock);
136 spinlock_unlock(&cmd->lock);
137 spinlock_unlock(&cmd_lock);
138 return 0;
139 }
140
141 spinlock_unlock(&hlp->lock);
142 spinlock_unlock(&cmd->lock);
143 }
144
145 /*
146 * Now the command can be added.
147 */
148 list_append(&cmd->link, &cmd_head);
149
150 spinlock_unlock(&cmd_lock);
151 return 1;
152}
153
154/** Print count times a character */
155static void rdln_print_c(char ch, int count)
156{
157 int i;
158 for (i=0;i<count;i++)
159 putchar(ch);
160}
161
162/** Insert character to string */
163static void insert_char(char *str, char ch, int pos)
164{
165 int i;
166
167 for (i=strlen(str);i > pos; i--)
168 str[i] = str[i-1];
169 str[pos] = ch;
170}
171
172/** Try to find a command beginning with prefix */
173static const char * cmdtab_search_one(const char *name,link_t **startpos)
174{
175 int namelen = strlen(name);
176 const char *curname;
177
178 spinlock_lock(&cmd_lock);
179
180 if (!*startpos)
181 *startpos = cmd_head.next;
182
183 for (;*startpos != &cmd_head;*startpos = (*startpos)->next) {
184 cmd_info_t *hlp;
185 hlp = list_get_instance(*startpos, cmd_info_t, link);
186
187 curname = hlp->name;
188 if (strlen(curname) < namelen)
189 continue;
190 if (strncmp(curname, name, namelen) == 0) {
191 spinlock_unlock(&cmd_lock);
192 return curname+namelen;
193 }
194 }
195 spinlock_unlock(&cmd_lock);
196 return NULL;
197}
198
199
200/** Command completion of the commands
201 *
202 * @param name - string to match, changed to hint on exit
203 * @return number of found matches
204 */
205static int cmdtab_compl(char *name)
206{
207 static char output[MAX_SYMBOL_NAME+1];
208 link_t *startpos = NULL;
209 const char *foundtxt;
210 int found = 0;
211 int i;
212
213 output[0] = '\0';
214 while ((foundtxt = cmdtab_search_one(name, &startpos))) {
215 startpos = startpos->next;
216 if (!found)
217 strncpy(output, foundtxt, strlen(foundtxt)+1);
218 else {
219 for (i=0; output[i] && foundtxt[i] && output[i]==foundtxt[i]; i++)
220 ;
221 output[i] = '\0';
222 }
223 found++;
224 }
225 if (!found)
226 return 0;
227
228 if (found > 1 && !strlen(output)) {
229 printf("\n");
230 startpos = NULL;
231 while ((foundtxt = cmdtab_search_one(name, &startpos))) {
232 cmd_info_t *hlp;
233 hlp = list_get_instance(startpos, cmd_info_t, link);
234 printf("%s - %s\n", hlp->name, hlp->description);
235 startpos = startpos->next;
236 }
237 }
238 strncpy(name, output, MAX_SYMBOL_NAME);
239 return found;
240
241}
242
243static char * clever_readline(const char *prompt, chardev_t *input)
244{
245 static int histposition = 0;
246
247 static char tmp[MAX_CMDLINE+1];
248 int curlen = 0, position = 0;
249 char *current = history[histposition];
250 int i;
251 char mod; /* Command Modifier */
252 char c;
253
254 printf("%s> ", prompt);
255 while (1) {
256 c = _getc(input);
257 if (c == '\n') {
258 putchar(c);
259 break;
260 } if (c == '\b') { /* Backspace */
261 if (position == 0)
262 continue;
263 for (i=position; i<curlen;i++)
264 current[i-1] = current[i];
265 curlen--;
266 position--;
267 putchar('\b');
268 for (i=position;i<curlen;i++)
269 putchar(current[i]);
270 putchar(' ');
271 rdln_print_c('\b',curlen-position+1);
272 continue;
273 }
274 if (c == '\t') { /* Tabulator */
275 int found;
276
277 /* Move to the end of the word */
278 for (;position<curlen && current[position]!=' ';position++)
279 putchar(current[position]);
280 /* Copy to tmp last word */
281 for (i=position-1;i >= 0 && current[i]!=' ' ;i--)
282 ;
283 /* If word begins with * or &, skip it */
284 if (tmp[0] == '*' || tmp[0] == '&')
285 for (i=1;tmp[i];i++)
286 tmp[i-1] = tmp[i];
287 i++; /* I is at the start of the word */
288 strncpy(tmp, current+i, position-i+1);
289
290 if (i==0) { /* Command completion */
291 found = cmdtab_compl(tmp);
292 } else { /* Symtab completion */
293 found = symtab_compl(tmp);
294 }
295
296 if (found == 0)
297 continue;
298 for (i=0;tmp[i] && curlen < MAX_CMDLINE;i++,curlen++)
299 insert_char(current, tmp[i], i+position);
300
301 if (strlen(tmp) || found==1) { /* If we have a hint */
302 for (i=position;i<curlen;i++)
303 putchar(current[i]);
304 position += strlen(tmp);
305 /* Add space to end */
306 if (found == 1 && position == curlen && \
307 curlen < MAX_CMDLINE) {
308 current[position] = ' ';
309 curlen++;
310 position++;
311 putchar(' ');
312 }
313 } else { /* No hint, table was printed */
314 printf("%s> ", prompt);
315 for (i=0; i<curlen;i++)
316 putchar(current[i]);
317 position += strlen(tmp);
318 }
319 rdln_print_c('\b', curlen-position);
320 continue;
321 }
322 if (c == 0x1b) { /* Special command */
323 mod = _getc(input);
324 c = _getc(input);
325
326 if (mod != 0x5b && mod != 0x4f)
327 continue;
328
329 if (c == 0x33 && _getc(input) == 0x7e) {
330 /* Delete */
331 if (position == curlen)
332 continue;
333 for (i=position+1; i<curlen;i++) {
334 putchar(current[i]);
335 current[i-1] = current[i];
336 }
337 putchar(' ');
338 rdln_print_c('\b',curlen-position);
339 curlen--;
340 }
341 else if (c == 0x48) { /* Home */
342 rdln_print_c('\b',position);
343 position = 0;
344 }
345 else if (c == 0x46) { /* End */
346 for (i=position;i<curlen;i++)
347 putchar(current[i]);
348 position = curlen;
349 }
350 else if (c == 0x44) { /* Left */
351 if (position > 0) {
352 putchar('\b');
353 position--;
354 }
355 continue;
356 }
357 else if (c == 0x43) { /* Right */
358 if (position < curlen) {
359 putchar(current[position]);
360 position++;
361 }
362 continue;
363 }
364 else if (c == 0x41 || c == 0x42) {
365 /* Up,down */
366 rdln_print_c('\b',position);
367 rdln_print_c(' ',curlen);
368 rdln_print_c('\b',curlen);
369 if (c == 0x41) /* Up */
370 histposition--;
371 else
372 histposition++;
373 if (histposition < 0)
374 histposition = KCONSOLE_HISTORY -1 ;
375 else
376 histposition = histposition % KCONSOLE_HISTORY;
377 current = history[histposition];
378 printf("%s", current);
379 curlen = strlen(current);
380 position = curlen;
381 continue;
382 }
383 continue;
384 }
385 if (curlen >= MAX_CMDLINE)
386 continue;
387
388 insert_char(current, c, position);
389
390 curlen++;
391 for (i=position;i<curlen;i++)
392 putchar(current[i]);
393 position++;
394 rdln_print_c('\b',curlen-position);
395 }
396 if (curlen) {
397 histposition++;
398 histposition = histposition % KCONSOLE_HISTORY;
399 }
400 current[curlen] = '\0';
401 return current;
402}
403
404/** Kernel console managing thread.
405 *
406 * @param prompt Kernel console prompt (e.g kconsole/panic).
407 */
408void kconsole(void *prompt)
409{
410 cmd_info_t *cmd_info;
411 count_t len;
412 char *cmdline;
413
414 if (!stdin) {
415 printf("%s: no stdin\n", __FUNCTION__);
416 return;
417 }
418
419 while (true) {
420 cmdline = clever_readline(prompt, stdin);
421 len = strlen(cmdline);
422 if (!len)
423 continue;
424 cmd_info = parse_cmdline(cmdline, len);
425 if (!cmd_info)
426 continue;
427 if (strncmp(cmd_info->name,"exit", \
428 min(strlen(cmd_info->name),5)) == 0)
429 break;
430 (void) cmd_info->func(cmd_info->argv);
431 }
432}
433
434static int parse_int_arg(char *text, size_t len, unative_t *result)
435{
436 static char symname[MAX_SYMBOL_NAME];
437 uintptr_t symaddr;
438 bool isaddr = false;
439 bool isptr = false;
440
441 /* If we get a name, try to find it in symbol table */
442 if (text[0] == '&') {
443 isaddr = true;
444 text++;len--;
445 } else if (text[0] == '*') {
446 isptr = true;
447 text++;len--;
448 }
449 if (text[0] < '0' || text[0] > '9') {
450 strncpy(symname, text, min(len+1, MAX_SYMBOL_NAME));
451 symaddr = get_symbol_addr(symname);
452 if (!symaddr) {
453 printf("Symbol %s not found.\n",symname);
454 return -1;
455 }
456 if (symaddr == (uintptr_t) -1) {
457 printf("Duplicate symbol %s.\n",symname);
458 symtab_print_search(symname);
459 return -1;
460 }
461 if (isaddr)
462 *result = (unative_t)symaddr;
463 else if (isptr)
464 *result = **((unative_t **)symaddr);
465 else
466 *result = *((unative_t *)symaddr);
467 } else { /* It's a number - convert it */
468 *result = atoi(text);
469 if (isptr)
470 *result = *((unative_t *)*result);
471 }
472
473 return 0;
474}
475
476/** Parse command line.
477 *
478 * @param cmdline Command line as read from input device.
479 * @param len Command line length.
480 *
481 * @return Structure describing the command.
482 */
483cmd_info_t *parse_cmdline(char *cmdline, size_t len)
484{
485 index_t start = 0, end = 0;
486 cmd_info_t *cmd = NULL;
487 link_t *cur;
488 int i;
489 int error = 0;
490
491 if (!parse_argument(cmdline, len, &start, &end)) {
492 /* Command line did not contain alphanumeric word. */
493 return NULL;
494 }
495
496 spinlock_lock(&cmd_lock);
497
498 for (cur = cmd_head.next; cur != &cmd_head; cur = cur->next) {
499 cmd_info_t *hlp;
500
501 hlp = list_get_instance(cur, cmd_info_t, link);
502 spinlock_lock(&hlp->lock);
503
504 if (strncmp(hlp->name, &cmdline[start], max(strlen(hlp->name),
505 end-start+1)) == 0) {
506 cmd = hlp;
507 break;
508 }
509
510 spinlock_unlock(&hlp->lock);
511 }
512
513 spinlock_unlock(&cmd_lock);
514
515 if (!cmd) {
516 /* Unknown command. */
517 printf("Unknown command.\n");
518 return NULL;
519 }
520
521 /* cmd == hlp is locked */
522
523 /*
524 * The command line must be further analyzed and
525 * the parameters therefrom must be matched and
526 * converted to those specified in the cmd info
527 * structure.
528 */
529
530 for (i = 0; i < cmd->argc; i++) {
531 char *buf;
532 start = end + 1;
533 if (!parse_argument(cmdline, len, &start, &end)) {
534 printf("Too few arguments.\n");
535 spinlock_unlock(&cmd->lock);
536 return NULL;
537 }
538
539 error = 0;
540 switch (cmd->argv[i].type) {
541 case ARG_TYPE_STRING:
542 buf = cmd->argv[i].buffer;
543 strncpy(buf, (const char *) &cmdline[start], min((end - start) + 2, cmd->argv[i].len));
544 buf[min((end - start) + 1, cmd->argv[i].len - 1)] = '\0';
545 break;
546 case ARG_TYPE_INT:
547 if (parse_int_arg(cmdline+start, end-start+1,
548 &cmd->argv[i].intval))
549 error = 1;
550 break;
551 case ARG_TYPE_VAR:
552 if (start != end && cmdline[start] == '"' && cmdline[end] == '"') {
553 buf = cmd->argv[i].buffer;
554 strncpy(buf, (const char *) &cmdline[start+1],
555 min((end-start), cmd->argv[i].len));
556 buf[min((end - start), cmd->argv[i].len - 1)] = '\0';
557 cmd->argv[i].intval = (unative_t) buf;
558 cmd->argv[i].vartype = ARG_TYPE_STRING;
559 } else if (!parse_int_arg(cmdline+start, end-start+1,
560 &cmd->argv[i].intval))
561 cmd->argv[i].vartype = ARG_TYPE_INT;
562 else {
563 printf("Unrecognized variable argument.\n");
564 error = 1;
565 }
566 break;
567 case ARG_TYPE_INVALID:
568 default:
569 printf("invalid argument type\n");
570 error = 1;
571 break;
572 }
573 }
574
575 if (error) {
576 spinlock_unlock(&cmd->lock);
577 return NULL;
578 }
579
580 start = end + 1;
581 if (parse_argument(cmdline, len, &start, &end)) {
582 printf("Too many arguments.\n");
583 spinlock_unlock(&cmd->lock);
584 return NULL;
585 }
586
587 spinlock_unlock(&cmd->lock);
588 return cmd;
589}
590
591/** Parse argument.
592 *
593 * Find start and end positions of command line argument.
594 *
595 * @param cmdline Command line as read from the input device.
596 * @param len Number of characters in cmdline.
597 * @param start On entry, 'start' contains pointer to the index
598 * of first unprocessed character of cmdline.
599 * On successful exit, it marks beginning of the next argument.
600 * @param end Undefined on entry. On exit, 'end' points to the last character
601 * of the next argument.
602 *
603 * @return false on failure, true on success.
604 */
605bool parse_argument(char *cmdline, size_t len, index_t *start, index_t *end)
606{
607 int i;
608 bool found_start = false;
609
610 ASSERT(start != NULL);
611 ASSERT(end != NULL);
612
613 for (i = *start; i < len; i++) {
614 if (!found_start) {
615 if (is_white(cmdline[i]))
616 (*start)++;
617 else
618 found_start = true;
619 } else {
620 if (is_white(cmdline[i]))
621 break;
622 }
623 }
624 *end = i - 1;
625
626 return found_start;
627}
628
629/** @}
630 */
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