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sparc,sunzilog: Add console polling support for sunzilog serial driver
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / kernel / debug / gdbstub.c
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53197fc4
JW		 1/*
2 * Kernel Debug Core
3 *
4 * Maintainer: Jason Wessel <jason.wessel@windriver.com>
5 *
6 * Copyright (C) 2000-2001 VERITAS Software Corporation.
7 * Copyright (C) 2002-2004 Timesys Corporation
8 * Copyright (C) 2003-2004 Amit S. Kale <amitkale@linsyssoft.com>
9 * Copyright (C) 2004 Pavel Machek <pavel@suse.cz>
10 * Copyright (C) 2004-2006 Tom Rini <trini@kernel.crashing.org>
11 * Copyright (C) 2004-2006 LinSysSoft Technologies Pvt. Ltd.
12 * Copyright (C) 2005-2009 Wind River Systems, Inc.
13 * Copyright (C) 2007 MontaVista Software, Inc.
14 * Copyright (C) 2008 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
15 *
16 * Contributors at various stages not listed above:
17 * Jason Wessel ( jason.wessel@windriver.com )
18 * George Anzinger <george@mvista.com>
19 * Anurekh Saxena (anurekh.saxena@timesys.com)
20 * Lake Stevens Instrument Division (Glenn Engel)
21 * Jim Kingdon, Cygnus Support.
22 *
23 * Original KGDB stub: David Grothe <dave@gcom.com>,
24 * Tigran Aivazian <tigran@sco.com>
25 *
26 * This file is licensed under the terms of the GNU General Public License
27 * version 2. This program is licensed "as is" without any warranty of any
28 * kind, whether express or implied.
29 */
30
31#include <linux/kernel.h>
32#include <linux/kgdb.h>
f5316b4a 33#include <linux/kdb.h>
53197fc4
JW		 34#include <linux/reboot.h>
35#include <linux/uaccess.h>
36#include <asm/cacheflush.h>
37#include <asm/unaligned.h>
38#include "debug_core.h"
39
40#define KGDB_MAX_THREAD_QUERY 17
41
42/* Our I/O buffers. */
43static char remcom_in_buffer[BUFMAX];
44static char remcom_out_buffer[BUFMAX];
45
46/* Storage for the registers, in GDB format. */
47static unsigned long gdb_regs[(NUMREGBYTES +
48 sizeof(unsigned long) - 1) /
49 sizeof(unsigned long)];
50
51/*
52 * GDB remote protocol parser:
53 */
54
55static int hex(char ch)
56{
57 if ((ch >= 'a') && (ch <= 'f'))
58 return ch - 'a' + 10;
59 if ((ch >= '0') && (ch <= '9'))
60 return ch - '0';
61 if ((ch >= 'A') && (ch <= 'F'))
62 return ch - 'A' + 10;
63 return -1;
64}
65
f5316b4a
JW		 66#ifdef CONFIG_KGDB_KDB
67static int gdbstub_read_wait(void)
68{
69 int ret = -1;
70 int i;
71
72 /* poll any additional I/O interfaces that are defined */
73 while (ret < 0)
74 for (i = 0; kdb_poll_funcs[i] != NULL; i++) {
75 ret = kdb_poll_funcs[i]();
76 if (ret > 0)
77 break;
78 }
79 return ret;
80}
81#else
82static int gdbstub_read_wait(void)
83{
84 int ret = dbg_io_ops->read_char();
85 while (ret == NO_POLL_CHAR)
86 ret = dbg_io_ops->read_char();
87 return ret;
88}
89#endif
53197fc4
JW		 90/* scan for the sequence $<data>#<checksum> */
91static void get_packet(char *buffer)
92{
93 unsigned char checksum;
94 unsigned char xmitcsum;
95 int count;
96 char ch;
97
98 do {
99 /*
100 * Spin and wait around for the start character, ignore all
101 * other characters:
102 */
f5316b4a 103 while ((ch = (gdbstub_read_wait())) != '$')
53197fc4
JW		 104 /* nothing */;
105
106 kgdb_connected = 1;
107 checksum = 0;
108 xmitcsum = -1;
109
110 count = 0;
111
112 /*
113 * now, read until a # or end of buffer is found:
114 */
115 while (count < (BUFMAX - 1)) {
f5316b4a 116 ch = gdbstub_read_wait();
53197fc4
JW		 117 if (ch == '#')
118 break;
119 checksum = checksum + ch;
120 buffer[count] = ch;
121 count = count + 1;
122 }
123 buffer[count] = 0;
124
125 if (ch == '#') {
f5316b4a
JW		 126 xmitcsum = hex(gdbstub_read_wait()) << 4;
127 xmitcsum += hex(gdbstub_read_wait());
53197fc4
JW		 128
129 if (checksum != xmitcsum)
130 /* failed checksum */
131 dbg_io_ops->write_char('-');
132 else
133 /* successful transfer */
134 dbg_io_ops->write_char('+');
135 if (dbg_io_ops->flush)
136 dbg_io_ops->flush();
137 }
138 } while (checksum != xmitcsum);
139}
140
141/*
142 * Send the packet in buffer.
143 * Check for gdb connection if asked for.
144 */
145static void put_packet(char *buffer)
146{
147 unsigned char checksum;
148 int count;
149 char ch;
150
151 /*
152 * $<packet info>#<checksum>.
153 */
154 while (1) {
155 dbg_io_ops->write_char('$');
156 checksum = 0;
157 count = 0;
158
159 while ((ch = buffer[count])) {
160 dbg_io_ops->write_char(ch);
161 checksum += ch;
162 count++;
163 }
164
165 dbg_io_ops->write_char('#');
166 dbg_io_ops->write_char(hex_asc_hi(checksum));
167 dbg_io_ops->write_char(hex_asc_lo(checksum));
168 if (dbg_io_ops->flush)
169 dbg_io_ops->flush();
170
171 /* Now see what we get in reply. */
f5316b4a 172 ch = gdbstub_read_wait();
53197fc4
JW		 173
174 if (ch == 3)
f5316b4a 175 ch = gdbstub_read_wait();
53197fc4
JW		 176
177 /* If we get an ACK, we are done. */
178 if (ch == '+')
179 return;
180
181 /*
182 * If we get the start of another packet, this means
183 * that GDB is attempting to reconnect. We will NAK
184 * the packet being sent, and stop trying to send this
185 * packet.
186 */
187 if (ch == '$') {
188 dbg_io_ops->write_char('-');
189 if (dbg_io_ops->flush)
190 dbg_io_ops->flush();
191 return;
192 }
193 }
194}
195
196static char gdbmsgbuf[BUFMAX + 1];
197
198void gdbstub_msg_write(const char *s, int len)
199{
200 char *bufptr;
201 int wcount;
202 int i;
203
204 /* 'O'utput */
205 gdbmsgbuf[0] = 'O';
206
207 /* Fill and send buffers... */
208 while (len > 0) {
209 bufptr = gdbmsgbuf + 1;
210
211 /* Calculate how many this time */
212 if ((len << 1) > (BUFMAX - 2))
213 wcount = (BUFMAX - 2) >> 1;
214 else
215 wcount = len;
216
217 /* Pack in hex chars */
218 for (i = 0; i < wcount; i++)
219 bufptr = pack_hex_byte(bufptr, s[i]);
220 *bufptr = '\0';
221
222 /* Move up */
223 s += wcount;
224 len -= wcount;
225
226 /* Write packet */
227 put_packet(gdbmsgbuf);
228 }
229}
230
231/*
232 * Convert the memory pointed to by mem into hex, placing result in
233 * buf. Return a pointer to the last char put in buf (null). May
234 * return an error.
235 */
236int kgdb_mem2hex(char *mem, char *buf, int count)
237{
238 char *tmp;
239 int err;
240
241 /*
242 * We use the upper half of buf as an intermediate buffer for the
243 * raw memory copy. Hex conversion will work against this one.
244 */
245 tmp = buf + count;
246
247 err = probe_kernel_read(tmp, mem, count);
248 if (!err) {
249 while (count > 0) {
250 buf = pack_hex_byte(buf, *tmp);
251 tmp++;
252 count--;
253 }
254
255 *buf = 0;
256 }
257
258 return err;
259}
260
261/*
262 * Convert the hex array pointed to by buf into binary to be placed in
263 * mem. Return a pointer to the character AFTER the last byte
264 * written. May return an error.
265 */
266int kgdb_hex2mem(char *buf, char *mem, int count)
267{
268 char *tmp_raw;
269 char *tmp_hex;
270
271 /*
272 * We use the upper half of buf as an intermediate buffer for the
273 * raw memory that is converted from hex.
274 */
275 tmp_raw = buf + count * 2;
276
277 tmp_hex = tmp_raw - 1;
278 while (tmp_hex >= buf) {
279 tmp_raw--;
280 *tmp_raw = hex(*tmp_hex--);
281 *tmp_raw |= hex(*tmp_hex--) << 4;
282 }
283
284 return probe_kernel_write(mem, tmp_raw, count);
285}
286
287/*
288 * While we find nice hex chars, build a long_val.
289 * Return number of chars processed.
290 */
291int kgdb_hex2long(char **ptr, unsigned long *long_val)
292{
293 int hex_val;
294 int num = 0;
295 int negate = 0;
296
297 *long_val = 0;
298
299 if (**ptr == '-') {
300 negate = 1;
301 (*ptr)++;
302 }
303 while (**ptr) {
304 hex_val = hex(**ptr);
305 if (hex_val < 0)
306 break;
307
308 *long_val = (*long_val << 4) | hex_val;
309 num++;
310 (*ptr)++;
311 }
312
313 if (negate)
314 *long_val = -*long_val;
315
316 return num;
317}
318
319/*
320 * Copy the binary array pointed to by buf into mem. Fix $, #, and
321 * 0x7d escaped with 0x7d. Return -EFAULT on failure or 0 on success.
322 * The input buf is overwitten with the result to write to mem.
323 */
324static int kgdb_ebin2mem(char *buf, char *mem, int count)
325{
326 int size = 0;
327 char *c = buf;
328
329 while (count-- > 0) {
330 c[size] = *buf++;
331 if (c[size] == 0x7d)
332 c[size] = *buf++ ^ 0x20;
333 size++;
334 }
335
336 return probe_kernel_write(mem, c, size);
337}
338
339/* Write memory due to an 'M' or 'X' packet. */
340static int write_mem_msg(int binary)
341{
342 char *ptr = &remcom_in_buffer[1];
343 unsigned long addr;
344 unsigned long length;
345 int err;
346
347 if (kgdb_hex2long(&ptr, &addr) > 0 && *(ptr++) == ',' &&
348 kgdb_hex2long(&ptr, &length) > 0 && *(ptr++) == ':') {
349 if (binary)
350 err = kgdb_ebin2mem(ptr, (char *)addr, length);
351 else
352 err = kgdb_hex2mem(ptr, (char *)addr, length);
353 if (err)
354 return err;
355 if (CACHE_FLUSH_IS_SAFE)
356 flush_icache_range(addr, addr + length);
357 return 0;
358 }
359
360 return -EINVAL;
361}
362
363static void error_packet(char *pkt, int error)
364{
365 error = -error;
366 pkt[0] = 'E';
367 pkt[1] = hex_asc[(error / 10)];
368 pkt[2] = hex_asc[(error % 10)];
369 pkt[3] = '\0';
370}
371
372/*
373 * Thread ID accessors. We represent a flat TID space to GDB, where
374 * the per CPU idle threads (which under Linux all have PID 0) are
375 * remapped to negative TIDs.
376 */
377
378#define BUF_THREAD_ID_SIZE 16
379
380static char *pack_threadid(char *pkt, unsigned char *id)
381{
382 char *limit;
383
384 limit = pkt + BUF_THREAD_ID_SIZE;
385 while (pkt < limit)
386 pkt = pack_hex_byte(pkt, *id++);
387
388 return pkt;
389}
390
391static void int_to_threadref(unsigned char *id, int value)
392{
393 unsigned char *scan;
394 int i = 4;
395
396 scan = (unsigned char *)id;
397 while (i--)
398 *scan++ = 0;
399 put_unaligned_be32(value, scan);
400}
401
402static struct task_struct *getthread(struct pt_regs *regs, int tid)
403{
404 /*
405 * Non-positive TIDs are remapped to the cpu shadow information
406 */
407 if (tid == 0 || tid == -1)
408 tid = -atomic_read(&kgdb_active) - 2;
409 if (tid < -1 && tid > -NR_CPUS - 2) {
410 if (kgdb_info[-tid - 2].task)
411 return kgdb_info[-tid - 2].task;
412 else
413 return idle_task(-tid - 2);
414 }
415 if (tid <= 0) {
416 printk(KERN_ERR "KGDB: Internal thread select error\n");
417 dump_stack();
418 return NULL;
419 }
420
421 /*
422 * find_task_by_pid_ns() does not take the tasklist lock anymore
423 * but is nicely RCU locked - hence is a pretty resilient
424 * thing to use:
425 */
426 return find_task_by_pid_ns(tid, &init_pid_ns);
427}
428
429
430/*
431 * Remap normal tasks to their real PID,
432 * CPU shadow threads are mapped to -CPU - 2
433 */
434static inline int shadow_pid(int realpid)
435{
436 if (realpid)
437 return realpid;
438
439 return -raw_smp_processor_id() - 2;
440}
441
442/*
443 * All the functions that start with gdb_cmd are the various
444 * operations to implement the handlers for the gdbserial protocol
445 * where KGDB is communicating with an external debugger
446 */
447
448/* Handle the '?' status packets */
449static void gdb_cmd_status(struct kgdb_state *ks)
450{
451 /*
452 * We know that this packet is only sent
453 * during initial connect. So to be safe,
454 * we clear out our breakpoints now in case
455 * GDB is reconnecting.
456 */
457 dbg_remove_all_break();
458
459 remcom_out_buffer[0] = 'S';
460 pack_hex_byte(&remcom_out_buffer[1], ks->signo);
461}
462
463/* Handle the 'g' get registers request */
464static void gdb_cmd_getregs(struct kgdb_state *ks)
465{
466 struct task_struct *thread;
467 void *local_debuggerinfo;
468 int i;
469
470 thread = kgdb_usethread;
471 if (!thread) {
472 thread = kgdb_info[ks->cpu].task;
473 local_debuggerinfo = kgdb_info[ks->cpu].debuggerinfo;
474 } else {
475 local_debuggerinfo = NULL;
476 for_each_online_cpu(i) {
477 /*
478 * Try to find the task on some other
479 * or possibly this node if we do not
480 * find the matching task then we try
481 * to approximate the results.
482 */
483 if (thread == kgdb_info[i].task)
484 local_debuggerinfo = kgdb_info[i].debuggerinfo;
485 }
486 }
487
488 /*
489 * All threads that don't have debuggerinfo should be
490 * in schedule() sleeping, since all other CPUs
491 * are in kgdb_wait, and thus have debuggerinfo.
492 */
493 if (local_debuggerinfo) {
494 pt_regs_to_gdb_regs(gdb_regs, local_debuggerinfo);
495 } else {
496 /*
497 * Pull stuff saved during switch_to; nothing
498 * else is accessible (or even particularly
499 * relevant).
500 *
501 * This should be enough for a stack trace.
502 */
503 sleeping_thread_to_gdb_regs(gdb_regs, thread);
504 }
505 kgdb_mem2hex((char *)gdb_regs, remcom_out_buffer, NUMREGBYTES);
506}
507
508/* Handle the 'G' set registers request */
509static void gdb_cmd_setregs(struct kgdb_state *ks)
510{
511 kgdb_hex2mem(&remcom_in_buffer[1], (char *)gdb_regs, NUMREGBYTES);
512
513 if (kgdb_usethread && kgdb_usethread != current) {
514 error_packet(remcom_out_buffer, -EINVAL);
515 } else {
516 gdb_regs_to_pt_regs(gdb_regs, ks->linux_regs);
517 strcpy(remcom_out_buffer, "OK");
518 }
519}
520
521/* Handle the 'm' memory read bytes */
522static void gdb_cmd_memread(struct kgdb_state *ks)
523{
524 char *ptr = &remcom_in_buffer[1];
525 unsigned long length;
526 unsigned long addr;
527 int err;
528
529 if (kgdb_hex2long(&ptr, &addr) > 0 && *ptr++ == ',' &&
530 kgdb_hex2long(&ptr, &length) > 0) {
531 err = kgdb_mem2hex((char *)addr, remcom_out_buffer, length);
532 if (err)
533 error_packet(remcom_out_buffer, err);
534 } else {
535 error_packet(remcom_out_buffer, -EINVAL);
536 }
537}
538
539/* Handle the 'M' memory write bytes */
540static void gdb_cmd_memwrite(struct kgdb_state *ks)
541{
542 int err = write_mem_msg(0);
543
544 if (err)
545 error_packet(remcom_out_buffer, err);
546 else
547 strcpy(remcom_out_buffer, "OK");
548}
549
550/* Handle the 'X' memory binary write bytes */
551static void gdb_cmd_binwrite(struct kgdb_state *ks)
552{
553 int err = write_mem_msg(1);
554
555 if (err)
556 error_packet(remcom_out_buffer, err);
557 else
558 strcpy(remcom_out_buffer, "OK");
559}
560
561/* Handle the 'D' or 'k', detach or kill packets */
562static void gdb_cmd_detachkill(struct kgdb_state *ks)
563{
564 int error;
565
566 /* The detach case */
567 if (remcom_in_buffer[0] == 'D') {
568 error = dbg_remove_all_break();
569 if (error < 0) {
570 error_packet(remcom_out_buffer, error);
571 } else {
572 strcpy(remcom_out_buffer, "OK");
573 kgdb_connected = 0;
574 }
575 put_packet(remcom_out_buffer);
576 } else {
577 /*
578 * Assume the kill case, with no exit code checking,
579 * trying to force detach the debugger:
580 */
581 dbg_remove_all_break();
582 kgdb_connected = 0;
583 }
584}
585
586/* Handle the 'R' reboot packets */
587static int gdb_cmd_reboot(struct kgdb_state *ks)
588{
589 /* For now, only honor R0 */
590 if (strcmp(remcom_in_buffer, "R0") == 0) {
591 printk(KERN_CRIT "Executing emergency reboot\n");
592 strcpy(remcom_out_buffer, "OK");
593 put_packet(remcom_out_buffer);
594
595 /*
596 * Execution should not return from
597 * machine_emergency_restart()
598 */
599 machine_emergency_restart();
600 kgdb_connected = 0;
601
602 return 1;
603 }
604 return 0;
605}
606
607/* Handle the 'q' query packets */
608static void gdb_cmd_query(struct kgdb_state *ks)
609{
610 struct task_struct *g;
611 struct task_struct *p;
612 unsigned char thref[8];
613 char *ptr;
614 int i;
615 int cpu;
616 int finished = 0;
617
618 switch (remcom_in_buffer[1]) {
619 case 's':
620 case 'f':
621 if (memcmp(remcom_in_buffer + 2, "ThreadInfo", 10)) {
622 error_packet(remcom_out_buffer, -EINVAL);
623 break;
624 }
625
626 i = 0;
627 remcom_out_buffer[0] = 'm';
628 ptr = remcom_out_buffer + 1;
629 if (remcom_in_buffer[1] == 'f') {
630 /* Each cpu is a shadow thread */
631 for_each_online_cpu(cpu) {
632 ks->thr_query = 0;
633 int_to_threadref(thref, -cpu - 2);
634 pack_threadid(ptr, thref);
635 ptr += BUF_THREAD_ID_SIZE;
636 *(ptr++) = ',';
637 i++;
638 }
639 }
640
641 do_each_thread(g, p) {
642 if (i >= ks->thr_query && !finished) {
643 int_to_threadref(thref, p->pid);
644 pack_threadid(ptr, thref);
645 ptr += BUF_THREAD_ID_SIZE;
646 *(ptr++) = ',';
647 ks->thr_query++;
648 if (ks->thr_query % KGDB_MAX_THREAD_QUERY == 0)
649 finished = 1;
650 }
651 i++;
652 } while_each_thread(g, p);
653
654 *(--ptr) = '\0';
655 break;
656
657 case 'C':
658 /* Current thread id */
659 strcpy(remcom_out_buffer, "QC");
660 ks->threadid = shadow_pid(current->pid);
661 int_to_threadref(thref, ks->threadid);
662 pack_threadid(remcom_out_buffer + 2, thref);
663 break;
664 case 'T':
665 if (memcmp(remcom_in_buffer + 1, "ThreadExtraInfo,", 16)) {
666 error_packet(remcom_out_buffer, -EINVAL);
667 break;
668 }
669 ks->threadid = 0;
670 ptr = remcom_in_buffer + 17;
671 kgdb_hex2long(&ptr, &ks->threadid);
672 if (!getthread(ks->linux_regs, ks->threadid)) {
673 error_packet(remcom_out_buffer, -EINVAL);
674 break;
675 }
676 if ((int)ks->threadid > 0) {
677 kgdb_mem2hex(getthread(ks->linux_regs,
678 ks->threadid)->comm,
679 remcom_out_buffer, 16);
680 } else {
681 static char tmpstr[23 + BUF_THREAD_ID_SIZE];
682
683 sprintf(tmpstr, "shadowCPU%d",
684 (int)(-ks->threadid - 2));
685 kgdb_mem2hex(tmpstr, remcom_out_buffer, strlen(tmpstr));
686 }
687 break;
688 }
689}
690
691/* Handle the 'H' task query packets */
692static void gdb_cmd_task(struct kgdb_state *ks)
693{
694 struct task_struct *thread;
695 char *ptr;
696
697 switch (remcom_in_buffer[1]) {
698 case 'g':
699 ptr = &remcom_in_buffer[2];
700 kgdb_hex2long(&ptr, &ks->threadid);
701 thread = getthread(ks->linux_regs, ks->threadid);
702 if (!thread && ks->threadid > 0) {
703 error_packet(remcom_out_buffer, -EINVAL);
704 break;
705 }
706 kgdb_usethread = thread;
707 ks->kgdb_usethreadid = ks->threadid;
708 strcpy(remcom_out_buffer, "OK");
709 break;
710 case 'c':
711 ptr = &remcom_in_buffer[2];
712 kgdb_hex2long(&ptr, &ks->threadid);
713 if (!ks->threadid) {
714 kgdb_contthread = NULL;
715 } else {
716 thread = getthread(ks->linux_regs, ks->threadid);
717 if (!thread && ks->threadid > 0) {
718 error_packet(remcom_out_buffer, -EINVAL);
719 break;
720 }
721 kgdb_contthread = thread;
722 }
723 strcpy(remcom_out_buffer, "OK");
724 break;
725 }
726}
727
728/* Handle the 'T' thread query packets */
729static void gdb_cmd_thread(struct kgdb_state *ks)
730{
731 char *ptr = &remcom_in_buffer[1];
732 struct task_struct *thread;
733
734 kgdb_hex2long(&ptr, &ks->threadid);
735 thread = getthread(ks->linux_regs, ks->threadid);
736 if (thread)
737 strcpy(remcom_out_buffer, "OK");
738 else
739 error_packet(remcom_out_buffer, -EINVAL);
740}
741
742/* Handle the 'z' or 'Z' breakpoint remove or set packets */
743static void gdb_cmd_break(struct kgdb_state *ks)
744{
745 /*
746 * Since GDB-5.3, it's been drafted that '0' is a software
747 * breakpoint, '1' is a hardware breakpoint, so let's do that.
748 */
749 char *bpt_type = &remcom_in_buffer[1];
750 char *ptr = &remcom_in_buffer[2];
751 unsigned long addr;
752 unsigned long length;
753 int error = 0;
754
755 if (arch_kgdb_ops.set_hw_breakpoint && *bpt_type >= '1') {
756 /* Unsupported */
757 if (*bpt_type > '4')
758 return;
759 } else {
760 if (*bpt_type != '0' && *bpt_type != '1')
761 /* Unsupported. */
762 return;
763 }
764
765 /*
766 * Test if this is a hardware breakpoint, and
767 * if we support it:
768 */
769 if (*bpt_type == '1' && !(arch_kgdb_ops.flags & KGDB_HW_BREAKPOINT))
770 /* Unsupported. */
771 return;
772
773 if (*(ptr++) != ',') {
774 error_packet(remcom_out_buffer, -EINVAL);
775 return;
776 }
777 if (!kgdb_hex2long(&ptr, &addr)) {
778 error_packet(remcom_out_buffer, -EINVAL);
779 return;
780 }
781 if (*(ptr++) != ',' ||
782 !kgdb_hex2long(&ptr, &length)) {
783 error_packet(remcom_out_buffer, -EINVAL);
784 return;
785 }
786
787 if (remcom_in_buffer[0] == 'Z' && *bpt_type == '0')
788 error = dbg_set_sw_break(addr);
789 else if (remcom_in_buffer[0] == 'z' && *bpt_type == '0')
790 error = dbg_remove_sw_break(addr);
791 else if (remcom_in_buffer[0] == 'Z')
792 error = arch_kgdb_ops.set_hw_breakpoint(addr,
793 (int)length, *bpt_type - '0');
794 else if (remcom_in_buffer[0] == 'z')
795 error = arch_kgdb_ops.remove_hw_breakpoint(addr,
796 (int) length, *bpt_type - '0');
797
798 if (error == 0)
799 strcpy(remcom_out_buffer, "OK");
800 else
801 error_packet(remcom_out_buffer, error);
802}
803
804/* Handle the 'C' signal / exception passing packets */
805static int gdb_cmd_exception_pass(struct kgdb_state *ks)
806{
807 /* C09 == pass exception
808 * C15 == detach kgdb, pass exception
809 */
810 if (remcom_in_buffer[1] == '0' && remcom_in_buffer[2] == '9') {
811
812 ks->pass_exception = 1;
813 remcom_in_buffer[0] = 'c';
814
815 } else if (remcom_in_buffer[1] == '1' && remcom_in_buffer[2] == '5') {
816
817 ks->pass_exception = 1;
818 remcom_in_buffer[0] = 'D';
819 dbg_remove_all_break();
820 kgdb_connected = 0;
821 return 1;
822
823 } else {
824 gdbstub_msg_write("KGDB only knows signal 9 (pass)"
825 " and 15 (pass and disconnect)\n"
826 "Executing a continue without signal passing\n", 0);
827 remcom_in_buffer[0] = 'c';
828 }
829
830 /* Indicate fall through */
831 return -1;
832}
833
834/*
835 * This function performs all gdbserial command procesing
836 */
837int gdb_serial_stub(struct kgdb_state *ks)
838{
839 int error = 0;
840 int tmp;
841
842 /* Clear the out buffer. */
843 memset(remcom_out_buffer, 0, sizeof(remcom_out_buffer));
844
845 if (kgdb_connected) {
846 unsigned char thref[8];
847 char *ptr;
848
849 /* Reply to host that an exception has occurred */
850 ptr = remcom_out_buffer;
851 *ptr++ = 'T';
852 ptr = pack_hex_byte(ptr, ks->signo);
853 ptr += strlen(strcpy(ptr, "thread:"));
854 int_to_threadref(thref, shadow_pid(current->pid));
855 ptr = pack_threadid(ptr, thref);
856 *ptr++ = ';';
857 put_packet(remcom_out_buffer);
858 }
859
860 kgdb_usethread = kgdb_info[ks->cpu].task;
861 ks->kgdb_usethreadid = shadow_pid(kgdb_info[ks->cpu].task->pid);
862 ks->pass_exception = 0;
863
864 while (1) {
865 error = 0;
866
867 /* Clear the out buffer. */
868 memset(remcom_out_buffer, 0, sizeof(remcom_out_buffer));
869
870 get_packet(remcom_in_buffer);
871
872 switch (remcom_in_buffer[0]) {
873 case '?': /* gdbserial status */
874 gdb_cmd_status(ks);
875 break;
876 case 'g': /* return the value of the CPU registers */
877 gdb_cmd_getregs(ks);
878 break;
879 case 'G': /* set the value of the CPU registers - return OK */
880 gdb_cmd_setregs(ks);
881 break;
882 case 'm': /* mAA..AA,LLLL Read LLLL bytes at address AA..AA */
883 gdb_cmd_memread(ks);
884 break;
885 case 'M': /* MAA..AA,LLLL: Write LLLL bytes at address AA..AA */
886 gdb_cmd_memwrite(ks);
887 break;
888 case 'X': /* XAA..AA,LLLL: Write LLLL bytes at address AA..AA */
889 gdb_cmd_binwrite(ks);
890 break;
891 /* kill or detach. KGDB should treat this like a
892 * continue.
893 */
894 case 'D': /* Debugger detach */
895 case 'k': /* Debugger detach via kill */
896 gdb_cmd_detachkill(ks);
897 goto default_handle;
898 case 'R': /* Reboot */
899 if (gdb_cmd_reboot(ks))
900 goto default_handle;
901 break;
902 case 'q': /* query command */
903 gdb_cmd_query(ks);
904 break;
905 case 'H': /* task related */
906 gdb_cmd_task(ks);
907 break;
908 case 'T': /* Query thread status */
909 gdb_cmd_thread(ks);
910 break;
911 case 'z': /* Break point remove */
912 case 'Z': /* Break point set */
913 gdb_cmd_break(ks);
914 break;
dcc78711
JW		 915#ifdef CONFIG_KGDB_KDB
916 case '3': /* Escape into back into kdb */
917 if (remcom_in_buffer[1] == '\0') {
918 gdb_cmd_detachkill(ks);
919 return DBG_PASS_EVENT;
920 }
921#endif
53197fc4
JW		 922 case 'C': /* Exception passing */
923 tmp = gdb_cmd_exception_pass(ks);
924 if (tmp > 0)
925 goto default_handle;
926 if (tmp == 0)
927 break;
928 /* Fall through on tmp < 0 */
929 case 'c': /* Continue packet */
930 case 's': /* Single step packet */
931 if (kgdb_contthread && kgdb_contthread != current) {
932 /* Can't switch threads in kgdb */
933 error_packet(remcom_out_buffer, -EINVAL);
934 break;
935 }
936 dbg_activate_sw_breakpoints();
937 /* Fall through to default processing */
938 default:
939default_handle:
940 error = kgdb_arch_handle_exception(ks->ex_vector,
941 ks->signo,
942 ks->err_code,
943 remcom_in_buffer,
944 remcom_out_buffer,
945 ks->linux_regs);
946 /*
947 * Leave cmd processing on error, detach,
948 * kill, continue, or single step.
949 */
950 if (error >= 0 || remcom_in_buffer[0] == 'D' ||
951 remcom_in_buffer[0] == 'k') {
952 error = 0;
953 goto kgdb_exit;
954 }
955
956 }
957
958 /* reply to the request */
959 put_packet(remcom_out_buffer);
960 }
961
962kgdb_exit:
963 if (ks->pass_exception)
964 error = 1;
965 return error;
966}
dcc78711
JW		 967
968int gdbstub_state(struct kgdb_state *ks, char *cmd)
969{
970 int error;
971
972 switch (cmd[0]) {
973 case 'e':
974 error = kgdb_arch_handle_exception(ks->ex_vector,
975 ks->signo,
976 ks->err_code,
977 remcom_in_buffer,
978 remcom_out_buffer,
979 ks->linux_regs);
980 return error;
981 case 's':
982 case 'c':
983 strcpy(remcom_in_buffer, cmd);
984 return 0;
985 case '?':
986 gdb_cmd_status(ks);
987 break;
988 case '\0':
989 strcpy(remcom_out_buffer, "");
990 break;
991 }
992 dbg_io_ops->write_char('+');
993 put_packet(remcom_out_buffer);
994 return 0;
995}
kernel source for telekom puls (alcatel/mediatek)