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1 /* 1
2 * KGDB stub.
3 *
4 * Maintainer: Jason Wessel <jason.wessel@wind
5 *
6 * Copyright (C) 2000-2001 VERITAS Software Co
7 * Copyright (C) 2002-2004 Timesys Corporation
8 * Copyright (C) 2003-2004 Amit S. Kale <amitk
9 * Copyright (C) 2004 Pavel Machek <pavel@suse
10 * Copyright (C) 2004-2006 Tom Rini <trini@ker
11 * Copyright (C) 2004-2006 LinSysSoft Technolo
12 * Copyright (C) 2005-2008 Wind River Systems,
13 * Copyright (C) 2007 MontaVista Software, Inc
14 * Copyright (C) 2008 Red Hat, Inc., Ingo Moln
15 *
16 * Contributors at various stages not listed a
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 En
21 * Jim Kingdon, Cygnus Support.
22 *
23 * Original KGDB stub: David Grothe <dave@gcom
24 * Tigran Aivazian <tigran@sco.com>
25 *
26 * This file is licensed under the terms of th
27 * version 2. This program is licensed "as is"
28 * kind, whether express or implied.
29 */
30 #include <linux/pid_namespace.h>
31 #include <linux/clocksource.h>
32 #include <linux/interrupt.h>
33 #include <linux/spinlock.h>
34 #include <linux/console.h>
35 #include <linux/threads.h>
36 #include <linux/uaccess.h>
37 #include <linux/kernel.h>
38 #include <linux/module.h>
39 #include <linux/ptrace.h>
40 #include <linux/reboot.h>
41 #include <linux/string.h>
42 #include <linux/delay.h>
43 #include <linux/sched.h>
44 #include <linux/sysrq.h>
45 #include <linux/init.h>
46 #include <linux/kgdb.h>
47 #include <linux/pid.h>
48 #include <linux/smp.h>
49 #include <linux/mm.h>
50
51 #include <asm/cacheflush.h>
52 #include <asm/byteorder.h>
53 #include <asm/atomic.h>
54 #include <asm/system.h>
55 #include <asm/unaligned.h>
56
57 static int kgdb_break_asap;
58
59 #define KGDB_MAX_THREAD_QUERY 17
60 struct kgdb_state {
61 int ex_vector;
62 int signo;
63 int err_code;
64 int cpu;
65 int pass_exception
66 unsigned long thr_query;
67 unsigned long threadid;
68 long kgdb_usethread
69 struct pt_regs *linux_regs;
70 };
71
72 static struct debuggerinfo_struct {
73 void *debuggerinfo;
74 struct task_struct *task;
75 } kgdb_info[NR_CPUS];
76
77 /**
78 * kgdb_connected - Is a host GDB connected to
79 */
80 int kgdb_connected
81 EXPORT_SYMBOL_GPL(kgdb_connected);
82
83 /* All the KGDB handlers are installed */
84 static int kgdb_io_module
85
86 /* Guard for recursive entry */
87 static int exception_leve
88
89 static struct kgdb_io *kgdb_io_ops;
90 static DEFINE_SPINLOCK(kgdb_registration_lock)
91
92 /* kgdb console driver is loaded */
93 static int kgdb_con_registered;
94 /* determine if kgdb console output should be
95 static int kgdb_use_con;
96
97 static int __init opt_kgdb_con(char *str)
98 {
99 kgdb_use_con = 1;
100 return 0;
101 }
102
103 early_param("kgdbcon", opt_kgdb_con);
104
105 module_param(kgdb_use_con, int, 0644);
106
107 /*
108 * Holds information about breakpoints in a ke
109 * added and removed by gdb.
110 */
111 static struct kgdb_bkpt kgdb_break[KGD
112 [0 ... KGDB_MAX_BREAKPOINTS-1] = { .st
113 };
114
115 /*
116 * The CPU# of the active CPU, or -1 if none:
117 */
118 atomic_t kgdb_active =
119
120 /*
121 * We use NR_CPUs not PERCPU, in case kgdb is
122 * bootup code (which might not have percpu se
123 */
124 static atomic_t passive_cpu_wa
125 static atomic_t cpu_in_kgdb[NR
126 atomic_t kgdb_setting_b
127
128 struct task_struct *kgdb_usethrea
129 struct task_struct *kgdb_contthre
130
131 int kgdb_single_st
132
133 /* Our I/O buffers. */
134 static char remcom_in_buff
135 static char remcom_out_buf
136
137 /* Storage for the registers, in GDB format. *
138 static unsigned long gdb_regs[(NUMR
139 sizeof
140 sizeof
141
142 /* to keep track of the CPU which is doing the
143 atomic_t kgdb_cpu_doing
144
145 /*
146 * If you are debugging a problem where roundu
147 * all other CPUs) is a problem [this should b
148 * then use the nokgdbroundup option to avoid
149 * the other CPUs might interfere with your de
150 * use this with care:
151 */
152 static int kgdb_do_roundup = 1;
153
154 static int __init opt_nokgdbroundup(char *str)
155 {
156 kgdb_do_roundup = 0;
157
158 return 0;
159 }
160
161 early_param("nokgdbroundup", opt_nokgdbroundup
162
163 /*
164 * Finally, some KGDB code :-)
165 */
166
167 /*
168 * Weak aliases for breakpoint management,
169 * can be overriden by architectures when need
170 */
171 int __weak kgdb_arch_set_breakpoint(unsigned l
172 {
173 int err;
174
175 err = probe_kernel_read(saved_instr, (
176 if (err)
177 return err;
178
179 return probe_kernel_write((char *)addr
180 BREAK_INSTR_
181 }
182
183 int __weak kgdb_arch_remove_breakpoint(unsigne
184 {
185 return probe_kernel_write((char *)addr
186 (char *)bund
187 }
188
189 int __weak kgdb_validate_break_address(unsigne
190 {
191 char tmp_variable[BREAK_INSTR_SIZE];
192 int err;
193 /* Validate setting the breakpoint and
194 * remove fails, the kernel needs to e
195 * are deep trouble not being able to
196 * found them.
197 */
198 err = kgdb_arch_set_breakpoint(addr, t
199 if (err)
200 return err;
201 err = kgdb_arch_remove_breakpoint(addr
202 if (err)
203 printk(KERN_ERR "KGDB: Critica
204 "memory destroyed at: %lx",
205 return err;
206 }
207
208 unsigned long __weak kgdb_arch_pc(int exceptio
209 {
210 return instruction_pointer(regs);
211 }
212
213 int __weak kgdb_arch_init(void)
214 {
215 return 0;
216 }
217
218 int __weak kgdb_skipexception(int exception, s
219 {
220 return 0;
221 }
222
223 void __weak
224 kgdb_post_primary_code(struct pt_regs *regs, i
225 {
226 return;
227 }
228
229 /**
230 * kgdb_disable_hw_debug - Disable hardwa
231 * @regs: Current &struct pt_regs.
232 *
233 * This function will be called if the pa
234 * disable hardware debugging while it is
235 * handling exception.
236 */
237 void __weak kgdb_disable_hw_debug(struct pt_re
238 {
239 }
240
241 /*
242 * GDB remote protocol parser:
243 */
244
245 static int hex(char ch)
246 {
247 if ((ch >= 'a') && (ch <= 'f'))
248 return ch - 'a' + 10;
249 if ((ch >= '') && (ch <= '9'))
250 return ch - '';
251 if ((ch >= 'A') && (ch <= 'F'))
252 return ch - 'A' + 10;
253 return -1;
254 }
255
256 /* scan for the sequence $<data>#<checksum> */
257 static void get_packet(char *buffer)
258 {
259 unsigned char checksum;
260 unsigned char xmitcsum;
261 int count;
262 char ch;
263
264 do {
265 /*
266 * Spin and wait around for th
267 * other characters:
268 */
269 while ((ch = (kgdb_io_ops->rea
270 /* nothing */;
271
272 kgdb_connected = 1;
273 checksum = 0;
274 xmitcsum = -1;
275
276 count = 0;
277
278 /*
279 * now, read until a # or end
280 */
281 while (count < (BUFMAX - 1)) {
282 ch = kgdb_io_ops->read
283 if (ch == '#')
284 break;
285 checksum = checksum +
286 buffer[count] = ch;
287 count = count + 1;
288 }
289 buffer[count] = 0;
290
291 if (ch == '#') {
292 xmitcsum = hex(kgdb_io
293 xmitcsum += hex(kgdb_i
294
295 if (checksum != xmitcs
296 /* failed chec
297 kgdb_io_ops->w
298 else
299 /* successful
300 kgdb_io_ops->w
301 if (kgdb_io_ops->flush
302 kgdb_io_ops->f
303 }
304 } while (checksum != xmitcsum);
305 }
306
307 /*
308 * Send the packet in buffer.
309 * Check for gdb connection if asked for.
310 */
311 static void put_packet(char *buffer)
312 {
313 unsigned char checksum;
314 int count;
315 char ch;
316
317 /*
318 * $<packet info>#<checksum>.
319 */
320 while (1) {
321 kgdb_io_ops->write_char('$');
322 checksum = 0;
323 count = 0;
324
325 while ((ch = buffer[count])) {
326 kgdb_io_ops->write_cha
327 checksum += ch;
328 count++;
329 }
330
331 kgdb_io_ops->write_char('#');
332 kgdb_io_ops->write_char(hex_as
333 kgdb_io_ops->write_char(hex_as
334 if (kgdb_io_ops->flush)
335 kgdb_io_ops->flush();
336
337 /* Now see what we get in repl
338 ch = kgdb_io_ops->read_char();
339
340 if (ch == 3)
341 ch = kgdb_io_ops->read
342
343 /* If we get an ACK, we are do
344 if (ch == '+')
345 return;
346
347 /*
348 * If we get the start of anot
349 * that GDB is attempting to r
350 * the packet being sent, and
351 * packet.
352 */
353 if (ch == '$') {
354 kgdb_io_ops->write_cha
355 if (kgdb_io_ops->flush
356 kgdb_io_ops->f
357 return;
358 }
359 }
360 }
361
362 /*
363 * Convert the memory pointed to by mem into h
364 * Return a pointer to the last char put in bu
365 */
366 int kgdb_mem2hex(char *mem, char *buf, int cou
367 {
368 char *tmp;
369 int err;
370
371 /*
372 * We use the upper half of buf as an
373 * raw memory copy. Hex conversion wi
374 */
375 tmp = buf + count;
376
377 err = probe_kernel_read(tmp, mem, coun
378 if (!err) {
379 while (count > 0) {
380 buf = pack_hex_byte(bu
381 tmp++;
382 count--;
383 }
384
385 *buf = 0;
386 }
387
388 return err;
389 }
390
391 /*
392 * Copy the binary array pointed to by buf int
393 * 0x7d escaped with 0x7d. Return a pointer t
394 * the last byte written.
395 */
396 static int kgdb_ebin2mem(char *buf, char *mem,
397 {
398 int err = 0;
399 char c;
400
401 while (count-- > 0) {
402 c = *buf++;
403 if (c == 0x7d)
404 c = *buf++ ^ 0x20;
405
406 err = probe_kernel_write(mem,
407 if (err)
408 break;
409
410 mem++;
411 }
412
413 return err;
414 }
415
416 /*
417 * Convert the hex array pointed to by buf int
418 * Return a pointer to the character AFTER the
419 * May return an error.
420 */
421 int kgdb_hex2mem(char *buf, char *mem, int cou
422 {
423 char *tmp_raw;
424 char *tmp_hex;
425
426 /*
427 * We use the upper half of buf as an
428 * raw memory that is converted from h
429 */
430 tmp_raw = buf + count * 2;
431
432 tmp_hex = tmp_raw - 1;
433 while (tmp_hex >= buf) {
434 tmp_raw--;
435 *tmp_raw = hex(*tmp_hex--);
436 *tmp_raw |= hex(*tmp_hex--) <<
437 }
438
439 return probe_kernel_write(mem, tmp_raw
440 }
441
442 /*
443 * While we find nice hex chars, build a long_
444 * Return number of chars processed.
445 */
446 int kgdb_hex2long(char **ptr, unsigned long *l
447 {
448 int hex_val;
449 int num = 0;
450 int negate = 0;
451
452 *long_val = 0;
453
454 if (**ptr == '-') {
455 negate = 1;
456 (*ptr)++;
457 }
458 while (**ptr) {
459 hex_val = hex(**ptr);
460 if (hex_val < 0)
461 break;
462
463 *long_val = (*long_val << 4) |
464 num++;
465 (*ptr)++;
466 }
467
468 if (negate)
469 *long_val = -*long_val;
470
471 return num;
472 }
473
474 /* Write memory due to an 'M' or 'X' packet. *
475 static int write_mem_msg(int binary)
476 {
477 char *ptr = &remcom_in_buffer[1];
478 unsigned long addr;
479 unsigned long length;
480 int err;
481
482 if (kgdb_hex2long(&ptr, &addr) > 0 &&
483 kgdb_hex2long(&ptr, &length) > 0 &
484 if (binary)
485 err = kgdb_ebin2mem(pt
486 else
487 err = kgdb_hex2mem(ptr
488 if (err)
489 return err;
490 if (CACHE_FLUSH_IS_SAFE)
491 flush_icache_range(add
492 return 0;
493 }
494
495 return -EINVAL;
496 }
497
498 static void error_packet(char *pkt, int error)
499 {
500 error = -error;
501 pkt[0] = 'E';
502 pkt[1] = hex_asc[(error / 10)];
503 pkt[2] = hex_asc[(error % 10)];
504 pkt[3] = '\0';
505 }
506
507 /*
508 * Thread ID accessors. We represent a flat TI
509 * the per CPU idle threads (which under Linux
510 * remapped to negative TIDs.
511 */
512
513 #define BUF_THREAD_ID_SIZE 16
514
515 static char *pack_threadid(char *pkt, unsigned
516 {
517 char *limit;
518
519 limit = pkt + BUF_THREAD_ID_SIZE;
520 while (pkt < limit)
521 pkt = pack_hex_byte(pkt, *id++
522
523 return pkt;
524 }
525
526 static void int_to_threadref(unsigned char *id
527 {
528 unsigned char *scan;
529 int i = 4;
530
531 scan = (unsigned char *)id;
532 while (i--)
533 *scan++ = 0;
534 put_unaligned_be32(value, scan);
535 }
536
537 static struct task_struct *getthread(struct pt
538 {
539 /*
540 * Non-positive TIDs are remapped to t
541 */
542 if (tid == 0 || tid == -1)
543 tid = -atomic_read(&kgdb_activ
544 if (tid < 0) {
545 if (kgdb_info[-tid - 2].task)
546 return kgdb_info[-tid
547 else
548 return idle_task(-tid
549 }
550
551 /*
552 * find_task_by_pid_ns() does not take
553 * but is nicely RCU locked - hence is
554 * thing to use:
555 */
556 return find_task_by_pid_ns(tid, &init_
557 }
558
559 /*
560 * CPU debug state control:
561 */
562
563 #ifdef CONFIG_SMP
564 static void kgdb_wait(struct pt_regs *regs)
565 {
566 unsigned long flags;
567 int cpu;
568
569 local_irq_save(flags);
570 cpu = raw_smp_processor_id();
571 kgdb_info[cpu].debuggerinfo = regs;
572 kgdb_info[cpu].task = current;
573 /*
574 * Make sure the above info reaches th
575 * our cpu_in_kgdb[] flag setting does
576 */
577 smp_wmb();
578 atomic_set(&cpu_in_kgdb[cpu], 1);
579
580 /* Wait till primary CPU is done with
581 while (atomic_read(&passive_cpu_wait[c
582 cpu_relax();
583
584 kgdb_info[cpu].debuggerinfo = NULL;
585 kgdb_info[cpu].task = NULL;
586
587 /* fix up hardware debug registers on
588 if (arch_kgdb_ops.correct_hw_break)
589 arch_kgdb_ops.correct_hw_break
590
591 /* Signal the primary CPU that we are
592 atomic_set(&cpu_in_kgdb[cpu], 0);
593 touch_softlockup_watchdog();
594 clocksource_touch_watchdog();
595 local_irq_restore(flags);
596 }
597 #endif
598
599 /*
600 * Some architectures need cache flushes when
601 * breakpoint:
602 */
603 static void kgdb_flush_swbreak_addr(unsigned l
604 {
605 if (!CACHE_FLUSH_IS_SAFE)
606 return;
607
608 if (current->mm && current->mm->mmap_c
609 flush_cache_range(current->mm-
610 addr, addr +
611 }
612 /* Force flush instruction cache if it
613 flush_icache_range(addr, addr + BREAK_
614 }
615
616 /*
617 * SW breakpoint management:
618 */
619 static int kgdb_activate_sw_breakpoints(void)
620 {
621 unsigned long addr;
622 int error = 0;
623 int i;
624
625 for (i = 0; i < KGDB_MAX_BREAKPOINTS;
626 if (kgdb_break[i].state != BP_
627 continue;
628
629 addr = kgdb_break[i].bpt_addr;
630 error = kgdb_arch_set_breakpoi
631 kgdb_break[i].
632 if (error)
633 return error;
634
635 kgdb_flush_swbreak_addr(addr);
636 kgdb_break[i].state = BP_ACTIV
637 }
638 return 0;
639 }
640
641 static int kgdb_set_sw_break(unsigned long add
642 {
643 int err = kgdb_validate_break_address(
644 int breakno = -1;
645 int i;
646
647 if (err)
648 return err;
649
650 for (i = 0; i < KGDB_MAX_BREAKPOINTS;
651 if ((kgdb_break[i].state == BP
652 (kgdb_
653 return -EEXIST;
654 }
655 for (i = 0; i < KGDB_MAX_BREAKPOINTS;
656 if (kgdb_break[i].state == BP_
657 kgdb_b
658 breakno = i;
659 break;
660 }
661 }
662
663 if (breakno == -1) {
664 for (i = 0; i < KGDB_MAX_BREAK
665 if (kgdb_break[i].stat
666 breakno = i;
667 break;
668 }
669 }
670 }
671
672 if (breakno == -1)
673 return -E2BIG;
674
675 kgdb_break[breakno].state = BP_SET;
676 kgdb_break[breakno].type = BP_BREAKPOI
677 kgdb_break[breakno].bpt_addr = addr;
678
679 return 0;
680 }
681
682 static int kgdb_deactivate_sw_breakpoints(void
683 {
684 unsigned long addr;
685 int error = 0;
686 int i;
687
688 for (i = 0; i < KGDB_MAX_BREAKPOINTS;
689 if (kgdb_break[i].state != BP_
690 continue;
691 addr = kgdb_break[i].bpt_addr;
692 error = kgdb_arch_remove_break
693 kgdb_b
694 if (error)
695 return error;
696
697 kgdb_flush_swbreak_addr(addr);
698 kgdb_break[i].state = BP_SET;
699 }
700 return 0;
701 }
702
703 static int kgdb_remove_sw_break(unsigned long
704 {
705 int i;
706
707 for (i = 0; i < KGDB_MAX_BREAKPOINTS;
708 if ((kgdb_break[i].state == BP
709 (kgdb_break[i]
710 kgdb_break[i].state =
711 return 0;
712 }
713 }
714 return -ENOENT;
715 }
716
717 int kgdb_isremovedbreak(unsigned long addr)
718 {
719 int i;
720
721 for (i = 0; i < KGDB_MAX_BREAKPOINTS;
722 if ((kgdb_break[i].state == BP
723 (kgdb_
724 return 1;
725 }
726 return 0;
727 }
728
729 static int remove_all_break(void)
730 {
731 unsigned long addr;
732 int error;
733 int i;
734
735 /* Clear memory breakpoints. */
736 for (i = 0; i < KGDB_MAX_BREAKPOINTS;
737 if (kgdb_break[i].state != BP_
738 goto setundefined;
739 addr = kgdb_break[i].bpt_addr;
740 error = kgdb_arch_remove_break
741 kgdb_break[i].
742 if (error)
743 printk(KERN_ERR "KGDB:
744 addr);
745 setundefined:
746 kgdb_break[i].state = BP_UNDEF
747 }
748
749 /* Clear hardware breakpoints. */
750 if (arch_kgdb_ops.remove_all_hw_break)
751 arch_kgdb_ops.remove_all_hw_br
752
753 return 0;
754 }
755
756 /*
757 * Remap normal tasks to their real PID,
758 * CPU shadow threads are mapped to -CPU - 2
759 */
760 static inline int shadow_pid(int realpid)
761 {
762 if (realpid)
763 return realpid;
764
765 return -raw_smp_processor_id() - 2;
766 }
767
768 static char gdbmsgbuf[BUFMAX + 1];
769
770 static void kgdb_msg_write(const char *s, int
771 {
772 char *bufptr;
773 int wcount;
774 int i;
775
776 /* 'O'utput */
777 gdbmsgbuf[0] = 'O';
778
779 /* Fill and send buffers... */
780 while (len > 0) {
781 bufptr = gdbmsgbuf + 1;
782
783 /* Calculate how many this tim
784 if ((len << 1) > (BUFMAX - 2))
785 wcount = (BUFMAX - 2)
786 else
787 wcount = len;
788
789 /* Pack in hex chars */
790 for (i = 0; i < wcount; i++)
791 bufptr = pack_hex_byte
792 *bufptr = '\0';
793
794 /* Move up */
795 s += wcount;
796 len -= wcount;
797
798 /* Write packet */
799 put_packet(gdbmsgbuf);
800 }
801 }
802
803 /*
804 * Return true if there is a valid kgdb I/O mo
805 * debugger is attached a message can be print
806 * waiting for the debugger to attach.
807 *
808 * The print_wait argument is only to be true
809 * the core kgdb_handle_exception, because it
810 * debugger to attach.
811 */
812 static int kgdb_io_ready(int print_wait)
813 {
814 if (!kgdb_io_ops)
815 return 0;
816 if (kgdb_connected)
817 return 1;
818 if (atomic_read(&kgdb_setting_breakpoi
819 return 1;
820 if (print_wait)
821 printk(KERN_CRIT "KGDB: Waitin
822 return 1;
823 }
824
825 /*
826 * All the functions that start with gdb_cmd a
827 * operations to implement the handlers for th
828 * where KGDB is communicating with an externa
829 */
830
831 /* Handle the '?' status packets */
832 static void gdb_cmd_status(struct kgdb_state *
833 {
834 /*
835 * We know that this packet is only se
836 * during initial connect. So to be s
837 * we clear out our breakpoints now in
838 * GDB is reconnecting.
839 */
840 remove_all_break();
841
842 remcom_out_buffer[0] = 'S';
843 pack_hex_byte(&remcom_out_buffer[1], k
844 }
845
846 /* Handle the 'g' get registers request */
847 static void gdb_cmd_getregs(struct kgdb_state
848 {
849 struct task_struct *thread;
850 void *local_debuggerinfo;
851 int i;
852
853 thread = kgdb_usethread;
854 if (!thread) {
855 thread = kgdb_info[ks->cpu].ta
856 local_debuggerinfo = kgdb_info
857 } else {
858 local_debuggerinfo = NULL;
859 for_each_online_cpu(i) {
860 /*
861 * Try to find the tas
862 * or possibly this no
863 * find the matching t
864 * to approximate the
865 */
866 if (thread == kgdb_inf
867 local_debugger
868 }
869 }
870
871 /*
872 * All threads that don't have debugge
873 * in __schedule() sleeping, since all
874 * are in kgdb_wait, and thus have deb
875 */
876 if (local_debuggerinfo) {
877 pt_regs_to_gdb_regs(gdb_regs,
878 } else {
879 /*
880 * Pull stuff saved during swi
881 * else is accessible (or even
882 * relevant).
883 *
884 * This should be enough for a
885 */
886 sleeping_thread_to_gdb_regs(gd
887 }
888 kgdb_mem2hex((char *)gdb_regs, remcom_
889 }
890
891 /* Handle the 'G' set registers request */
892 static void gdb_cmd_setregs(struct kgdb_state
893 {
894 kgdb_hex2mem(&remcom_in_buffer[1], (ch
895
896 if (kgdb_usethread && kgdb_usethread !
897 error_packet(remcom_out_buffer
898 } else {
899 gdb_regs_to_pt_regs(gdb_regs,
900 strcpy(remcom_out_buffer, "OK"
901 }
902 }
903
904 /* Handle the 'm' memory read bytes */
905 static void gdb_cmd_memread(struct kgdb_state
906 {
907 char *ptr = &remcom_in_buffer[1];
908 unsigned long length;
909 unsigned long addr;
910 int err;
911
912 if (kgdb_hex2long(&ptr, &addr) > 0 &&
913 kgdb_h
914 err = kgdb_mem2hex((char *)add
915 if (err)
916 error_packet(remcom_ou
917 } else {
918 error_packet(remcom_out_buffer
919 }
920 }
921
922 /* Handle the 'M' memory write bytes */
923 static void gdb_cmd_memwrite(struct kgdb_state
924 {
925 int err = write_mem_msg(0);
926
927 if (err)
928 error_packet(remcom_out_buffer
929 else
930 strcpy(remcom_out_buffer, "OK"
931 }
932
933 /* Handle the 'X' memory binary write bytes */
934 static void gdb_cmd_binwrite(struct kgdb_state
935 {
936 int err = write_mem_msg(1);
937
938 if (err)
939 error_packet(remcom_out_buffer
940 else
941 strcpy(remcom_out_buffer, "OK"
942 }
943
944 /* Handle the 'D' or 'k', detach or kill packe
945 static void gdb_cmd_detachkill(struct kgdb_sta
946 {
947 int error;
948
949 /* The detach case */
950 if (remcom_in_buffer[0] == 'D') {
951 error = remove_all_break();
952 if (error < 0) {
953 error_packet(remcom_ou
954 } else {
955 strcpy(remcom_out_buff
956 kgdb_connected = 0;
957 }
958 put_packet(remcom_out_buffer);
959 } else {
960 /*
961 * Assume the kill case, with
962 * trying to force detach the
963 */
964 remove_all_break();
965 kgdb_connected = 0;
966 }
967 }
968
969 /* Handle the 'R' reboot packets */
970 static int gdb_cmd_reboot(struct kgdb_state *k
971 {
972 /* For now, only honor R0 */
973 if (strcmp(remcom_in_buffer, "R0") ==
974 printk(KERN_CRIT "Executing em
975 strcpy(remcom_out_buffer, "OK"
976 put_packet(remcom_out_buffer);
977
978 /*
979 * Execution should not return
980 * machine_emergency_restart()
981 */
982 machine_emergency_restart();
983 kgdb_connected = 0;
984
985 return 1;
986 }
987 return 0;
988 }
989
990 /* Handle the 'q' query packets */
991 static void gdb_cmd_query(struct kgdb_state *k
992 {
993 struct task_struct *g;
994 struct task_struct *p;
995 unsigned char thref[8];
996 char *ptr;
997 int i;
998 int cpu;
999 int finished = 0;
1000
1001 switch (remcom_in_buffer[1]) {
1002 case 's':
1003 case 'f':
1004 if (memcmp(remcom_in_buffer +
1005 error_packet(remcom_o
1006 break;
1007 }
1008
1009 i = 0;
1010 remcom_out_buffer[0] = 'm';
1011 ptr = remcom_out_buffer + 1;
1012 if (remcom_in_buffer[1] == 'f
1013 /* Each cpu is a shad
1014 for_each_online_cpu(c
1015 ks->thr_query
1016 int_to_thread
1017 pack_threadid
1018 ptr += BUF_TH
1019 *(ptr++) = ',
1020 i++;
1021 }
1022 }
1023
1024 do_each_thread(g, p) {
1025 if (i >= ks->thr_quer
1026 int_to_thread
1027 pack_threadid
1028 ptr += BUF_TH
1029 *(ptr++) = ',
1030 ks->thr_query
1031 if (ks->thr_q
1032 finis
1033 }
1034 i++;
1035 } while_each_thread(g, p);
1036
1037 *(--ptr) = '\0';
1038 break;
1039
1040 case 'C':
1041 /* Current thread id */
1042 strcpy(remcom_out_buffer, "QC
1043 ks->threadid = shadow_pid(cur
1044 int_to_threadref(thref, ks->t
1045 pack_threadid(remcom_out_buff
1046 break;
1047 case 'T':
1048 if (memcmp(remcom_in_buffer +
1049 error_packet(remcom_o
1050 break;
1051 }
1052 ks->threadid = 0;
1053 ptr = remcom_in_buffer + 17;
1054 kgdb_hex2long(&ptr, &ks->thre
1055 if (!getthread(ks->linux_regs
1056 error_packet(remcom_o
1057 break;
1058 }
1059 if ((int)ks->threadid > 0) {
1060 kgdb_mem2hex(getthrea
1061 ks->t
1062 remco
1063 } else {
1064 static char tmpstr[23
1065
1066 sprintf(tmpstr, "shad
1067 (int)
1068 kgdb_mem2hex(tmpstr,
1069 }
1070 break;
1071 }
1072 }
1073
1074 /* Handle the 'H' task query packets */
1075 static void gdb_cmd_task(struct kgdb_state *k
1076 {
1077 struct task_struct *thread;
1078 char *ptr;
1079
1080 switch (remcom_in_buffer[1]) {
1081 case 'g':
1082 ptr = &remcom_in_buffer[2];
1083 kgdb_hex2long(&ptr, &ks->thre
1084 thread = getthread(ks->linux_
1085 if (!thread && ks->threadid >
1086 error_packet(remcom_o
1087 break;
1088 }
1089 kgdb_usethread = thread;
1090 ks->kgdb_usethreadid = ks->th
1091 strcpy(remcom_out_buffer, "OK
1092 break;
1093 case 'c':
1094 ptr = &remcom_in_buffer[2];
1095 kgdb_hex2long(&ptr, &ks->thre
1096 if (!ks->threadid) {
1097 kgdb_contthread = NUL
1098 } else {
1099 thread = getthread(ks
1100 if (!thread && ks->th
1101 error_packet(
1102 break;
1103 }
1104 kgdb_contthread = thr
1105 }
1106 strcpy(remcom_out_buffer, "OK
1107 break;
1108 }
1109 }
1110
1111 /* Handle the 'T' thread query packets */
1112 static void gdb_cmd_thread(struct kgdb_state
1113 {
1114 char *ptr = &remcom_in_buffer[1];
1115 struct task_struct *thread;
1116
1117 kgdb_hex2long(&ptr, &ks->threadid);
1118 thread = getthread(ks->linux_regs, ks
1119 if (thread)
1120 strcpy(remcom_out_buffer, "OK
1121 else
1122 error_packet(remcom_out_buffe
1123 }
1124
1125 /* Handle the 'z' or 'Z' breakpoint remove or
1126 static void gdb_cmd_break(struct kgdb_state *
1127 {
1128 /*
1129 * Since GDB-5.3, it's been drafted t
1130 * breakpoint, '1' is a hardware brea
1131 */
1132 char *bpt_type = &remcom_in_buffer[1]
1133 char *ptr = &remcom_in_buffer[2];
1134 unsigned long addr;
1135 unsigned long length;
1136 int error = 0;
1137
1138 if (arch_kgdb_ops.set_hw_breakpoint &
1139 /* Unsupported */
1140 if (*bpt_type > '4')
1141 return;
1142 } else {
1143 if (*bpt_type != '' && *bpt_t
1144 /* Unsupported. */
1145 return;
1146 }
1147
1148 /*
1149 * Test if this is a hardware breakpo
1150 * if we support it:
1151 */
1152 if (*bpt_type == '1' && !(arch_kgdb_o
1153 /* Unsupported. */
1154 return;
1155
1156 if (*(ptr++) != ',') {
1157 error_packet(remcom_out_buffe
1158 return;
1159 }
1160 if (!kgdb_hex2long(&ptr, &addr)) {
1161 error_packet(remcom_out_buffe
1162 return;
1163 }
1164 if (*(ptr++) != ',' ||
1165 !kgdb_hex2long(&ptr, &length)
1166 error_packet(remcom_out_buffe
1167 return;
1168 }
1169
1170 if (remcom_in_buffer[0] == 'Z' && *bp
1171 error = kgdb_set_sw_break(add
1172 else if (remcom_in_buffer[0] == 'z' &
1173 error = kgdb_remove_sw_break(
1174 else if (remcom_in_buffer[0] == 'Z')
1175 error = arch_kgdb_ops.set_hw_
1176 (int)length, *bpt_typ
1177 else if (remcom_in_buffer[0] == 'z')
1178 error = arch_kgdb_ops.remove_
1179 (int) length, *bpt_ty
1180
1181 if (error == 0)
1182 strcpy(remcom_out_buffer, "OK
1183 else
1184 error_packet(remcom_out_buffe
1185 }
1186
1187 /* Handle the 'C' signal / exception passing
1188 static int gdb_cmd_exception_pass(struct kgdb
1189 {
1190 /* C09 == pass exception
1191 * C15 == detach kgdb, pass exception
1192 */
1193 if (remcom_in_buffer[1] == '' && remc
1194
1195 ks->pass_exception = 1;
1196 remcom_in_buffer[0] = 'c';
1197
1198 } else if (remcom_in_buffer[1] == '1'
1199
1200 ks->pass_exception = 1;
1201 remcom_in_buffer[0] = 'D';
1202 remove_all_break();
1203 kgdb_connected = 0;
1204 return 1;
1205
1206 } else {
1207 error_packet(remcom_out_buffe
1208 return 0;
1209 }
1210
1211 /* Indicate fall through */
1212 return -1;
1213 }
1214
1215 /*
1216 * This function performs all gdbserial comma
1217 */
1218 static int gdb_serial_stub(struct kgdb_state
1219 {
1220 int error = 0;
1221 int tmp;
1222
1223 /* Clear the out buffer. */
1224 memset(remcom_out_buffer, 0, sizeof(r
1225
1226 if (kgdb_connected) {
1227 unsigned char thref[8];
1228 char *ptr;
1229
1230 /* Reply to host that an exce
1231 ptr = remcom_out_buffer;
1232 *ptr++ = 'T';
1233 ptr = pack_hex_byte(ptr, ks->
1234 ptr += strlen(strcpy(ptr, "th
1235 int_to_threadref(thref, shado
1236 ptr = pack_threadid(ptr, thre
1237 *ptr++ = ';';
1238 put_packet(remcom_out_buffer)
1239 }
1240
1241 kgdb_usethread = kgdb_info[ks->cpu].t
1242 ks->kgdb_usethreadid = shadow_pid(kgd
1243 ks->pass_exception = 0;
1244
1245 while (1) {
1246 error = 0;
1247
1248 /* Clear the out buffer. */
1249 memset(remcom_out_buffer, 0,
1250
1251 get_packet(remcom_in_buffer);
1252
1253 switch (remcom_in_buffer[0])
1254 case '?': /* gdbserial status
1255 gdb_cmd_status(ks);
1256 break;
1257 case 'g': /* return the value
1258 gdb_cmd_getregs(ks);
1259 break;
1260 case 'G': /* set the value of
1261 gdb_cmd_setregs(ks);
1262 break;
1263 case 'm': /* mAA..AA,LLLL Re
1264 gdb_cmd_memread(ks);
1265 break;
1266 case 'M': /* MAA..AA,LLLL: Wr
1267 gdb_cmd_memwrite(ks);
1268 break;
1269 case 'X': /* XAA..AA,LLLL: Wr
1270 gdb_cmd_binwrite(ks);
1271 break;
1272 /* kill or detach. KG
1273 * continue.
1274 */
1275 case 'D': /* Debugger detach
1276 case 'k': /* Debugger detach
1277 gdb_cmd_detachkill(ks
1278 goto default_handle;
1279 case 'R': /* Reboot */
1280 if (gdb_cmd_reboot(ks
1281 goto default_
1282 break;
1283 case 'q': /* query command */
1284 gdb_cmd_query(ks);
1285 break;
1286 case 'H': /* task related */
1287 gdb_cmd_task(ks);
1288 break;
1289 case 'T': /* Query thread sta
1290 gdb_cmd_thread(ks);
1291 break;
1292 case 'z': /* Break point remo
1293 case 'Z': /* Break point set
1294 gdb_cmd_break(ks);
1295 break;
1296 case 'C': /* Exception passin
1297 tmp = gdb_cmd_excepti
1298 if (tmp > 0)
1299 goto default_
1300 if (tmp == 0)
1301 break;
1302 /* Fall through on tm
1303 case 'c': /* Continue packet
1304 case 's': /* Single step pack
1305 if (kgdb_contthread &
1306 /* Can't swit
1307 error_packet(
1308 break;
1309 }
1310 kgdb_activate_sw_brea
1311 /* Fall through to de
1312 default:
1313 default_handle:
1314 error = kgdb_arch_han
1315
1316
1317
1318
1319
1320 /*
1321 * Leave cmd processi
1322 * kill, continue, or
1323 */
1324 if (error >= 0 || rem
1325 remcom_in_buffer[
1326 error = 0;
1327 goto kgdb_exi
1328 }
1329
1330 }
1331
1332 /* reply to the request */
1333 put_packet(remcom_out_buffer)
1334 }
1335
1336 kgdb_exit:
1337 if (ks->pass_exception)
1338 error = 1;
1339 return error;
1340 }
1341
1342 static int kgdb_reenter_check(struct kgdb_sta
1343 {
1344 unsigned long addr;
1345
1346 if (atomic_read(&kgdb_active) != raw_
1347 return 0;
1348
1349 /* Panic on recursive debugger calls:
1350 exception_level++;
1351 addr = kgdb_arch_pc(ks->ex_vector, ks
1352 kgdb_deactivate_sw_breakpoints();
1353
1354 /*
1355 * If the break point removed ok at t
1356 * occurred, try to recover and print
1357 * user because the user planted a br
1358 * KGDB needs in order to function.
1359 */
1360 if (kgdb_remove_sw_break(addr) == 0)
1361 exception_level = 0;
1362 kgdb_skipexception(ks->ex_vec
1363 kgdb_activate_sw_breakpoints(
1364 printk(KERN_CRIT "KGDB: re-en
1365 addr);
1366 WARN_ON_ONCE(1);
1367
1368 return 1;
1369 }
1370 remove_all_break();
1371 kgdb_skipexception(ks->ex_vector, ks-
1372
1373 if (exception_level > 1) {
1374 dump_stack();
1375 panic("Recursive entry to deb
1376 }
1377
1378 printk(KERN_CRIT "KGDB: re-enter exce
1379 dump_stack();
1380 panic("Recursive entry to debugger");
1381
1382 return 1;
1383 }
1384
1385 /*
1386 * kgdb_handle_exception() - main entry point
1387 *
1388 * Locking hierarchy:
1389 * interface locks, if any (begin_sessio
1390 * kgdb lock (kgdb_active)
1391 */
1392 int
1393 kgdb_handle_exception(int evector, int signo,
1394 {
1395 struct kgdb_state kgdb_var;
1396 struct kgdb_state *ks = &kgdb_var;
1397 unsigned long flags;
1398 int error = 0;
1399 int i, cpu;
1400
1401 ks->cpu = raw_smp_pro
1402 ks->ex_vector = evector;
1403 ks->signo = signo;
1404 ks->ex_vector = evector;
1405 ks->err_code = ecode;
1406 ks->kgdb_usethreadid = 0;
1407 ks->linux_regs = regs;
1408
1409 if (kgdb_reenter_check(ks))
1410 return 0; /* Ouch, double exc
1411
1412 acquirelock:
1413 /*
1414 * Interrupts will be restored by the
1415 * single stepping.
1416 */
1417 local_irq_save(flags);
1418
1419 cpu = raw_smp_processor_id();
1420
1421 /*
1422 * Acquire the kgdb_active lock:
1423 */
1424 while (atomic_cmpxchg(&kgdb_active, -
1425 cpu_relax();
1426
1427 /*
1428 * Do not start the debugger connecti
1429 * instance of the exception handler
1430 * debugger on a different CPU via a
1431 */
1432 if (atomic_read(&kgdb_cpu_doing_singl
1433 atomic_read(&kgdb_cpu_doing_singl
1434
1435 atomic_set(&kgdb_active, -1);
1436 touch_softlockup_watchdog();
1437 clocksource_touch_watchdog();
1438 local_irq_restore(flags);
1439
1440 goto acquirelock;
1441 }
1442
1443 if (!kgdb_io_ready(1)) {
1444 error = 1;
1445 goto kgdb_restore; /* No I/O
1446 }
1447
1448 /*
1449 * Don't enter if we have hit a remov
1450 */
1451 if (kgdb_skipexception(ks->ex_vector,
1452 goto kgdb_restore;
1453
1454 /* Call the I/O driver's pre_exceptio
1455 if (kgdb_io_ops->pre_exception)
1456 kgdb_io_ops->pre_exception();
1457
1458 kgdb_info[ks->cpu].debuggerinfo = ks-
1459 kgdb_info[ks->cpu].task = current;
1460
1461 kgdb_disable_hw_debug(ks->linux_regs)
1462
1463 /*
1464 * Get the passive CPU lock which wil
1465 * CPU in a spin state while the debu
1466 */
1467 if (!kgdb_single_step) {
1468 for (i = 0; i < NR_CPUS; i++)
1469 atomic_set(&passive_c
1470 }
1471
1472 /*
1473 * spin_lock code is good enough as a
1474 * need one here:
1475 */
1476 atomic_set(&cpu_in_kgdb[ks->cpu], 1);
1477
1478 #ifdef CONFIG_SMP
1479 /* Signal the other CPUs to enter kgd
1480 if ((!kgdb_single_step) && kgdb_do_ro
1481 kgdb_roundup_cpus(flags);
1482 #endif
1483
1484 /*
1485 * Wait for the other CPUs to be noti
1486 */
1487 for_each_online_cpu(i) {
1488 while (!atomic_read(&cpu_in_k
1489 cpu_relax();
1490 }
1491
1492 /*
1493 * At this point the primary processo
1494 * in the debugger and all secondary
1495 */
1496 kgdb_post_primary_code(ks->linux_regs
1497 kgdb_deactivate_sw_breakpoints();
1498 kgdb_single_step = 0;
1499 kgdb_contthread = current;
1500 exception_level = 0;
1501
1502 /* Talk to debugger with gdbserial pr
1503 error = gdb_serial_stub(ks);
1504
1505 /* Call the I/O driver's post_excepti
1506 if (kgdb_io_ops->post_exception)
1507 kgdb_io_ops->post_exception()
1508
1509 kgdb_info[ks->cpu].debuggerinfo = NUL
1510 kgdb_info[ks->cpu].task = NULL;
1511 atomic_set(&cpu_in_kgdb[ks->cpu], 0);
1512
1513 if (!kgdb_single_step) {
1514 for (i = NR_CPUS-1; i >= 0; i
1515 atomic_set(&passive_c
1516 /*
1517 * Wait till all the CPUs hav
1518 * from the debugger.
1519 */
1520 for_each_online_cpu(i) {
1521 while (atomic_read(&c
1522 cpu_relax();
1523 }
1524 }
1525
1526 kgdb_restore:
1527 /* Free kgdb_active */
1528 atomic_set(&kgdb_active, -1);
1529 touch_softlockup_watchdog();
1530 clocksource_touch_watchdog();
1531 local_irq_restore(flags);
1532
1533 return error;
1534 }
1535
1536 int kgdb_nmicallback(int cpu, void *regs)
1537 {
1538 #ifdef CONFIG_SMP
1539 if (!atomic_read(&cpu_in_kgdb[cpu]) &
1540 atomic_read(&kgdb_act
1541 atomic_read(&cpu_in_k
1542 kgdb_wait((struct pt_regs *)r
1543 return 0;
1544 }
1545 #endif
1546 return 1;
1547 }
1548
1549 static void kgdb_console_write(struct console
1550 unsigned count)
1551 {
1552 unsigned long flags;
1553
1554 /* If we're debugging, or KGDB has no
1555 * and print. */
1556 if (!kgdb_connected || atomic_read(&k
1557 return;
1558
1559 local_irq_save(flags);
1560 kgdb_msg_write(s, count);
1561 local_irq_restore(flags);
1562 }
1563
1564 static struct console kgdbcons = {
1565 .name = "kgdb",
1566 .write = kgdb_console_write,
1567 .flags = CON_PRINTBUFFER | C
1568 .index = -1,
1569 };
1570
1571 #ifdef CONFIG_MAGIC_SYSRQ
1572 static void sysrq_handle_gdb(int key, struct
1573 {
1574 if (!kgdb_io_ops) {
1575 printk(KERN_CRIT "ERROR: No K
1576 return;
1577 }
1578 if (!kgdb_connected)
1579 printk(KERN_CRIT "Entering KG
1580
1581 kgdb_breakpoint();
1582 }
1583
1584 static struct sysrq_key_op sysrq_gdb_op = {
1585 .handler = sysrq_handle_gdb,
1586 .help_msg = "debug(G)",
1587 .action_msg = "DEBUG",
1588 };
1589 #endif
1590
1591 static void kgdb_register_callbacks(void)
1592 {
1593 if (!kgdb_io_module_registered) {
1594 kgdb_io_module_registered = 1
1595 kgdb_arch_init();
1596 #ifdef CONFIG_MAGIC_SYSRQ
1597 register_sysrq_key('g', &sysr
1598 #endif
1599 if (kgdb_use_con && !kgdb_con
1600 register_console(&kgd
1601 kgdb_con_registered =
1602 }
1603 }
1604 }
1605
1606 static void kgdb_unregister_callbacks(void)
1607 {
1608 /*
1609 * When this routine is called KGDB s
1610 * panic handler and clean up, making
1611 * break exceptions at the time.
1612 */
1613 if (kgdb_io_module_registered) {
1614 kgdb_io_module_registered = 0
1615 kgdb_arch_exit();
1616 #ifdef CONFIG_MAGIC_SYSRQ
1617 unregister_sysrq_key('g', &sy
1618 #endif
1619 if (kgdb_con_registered) {
1620 unregister_console(&k
1621 kgdb_con_registered =
1622 }
1623 }
1624 }
1625
1626 static void kgdb_initial_breakpoint(void)
1627 {
1628 kgdb_break_asap = 0;
1629
1630 printk(KERN_CRIT "kgdb: Waiting for c
1631 kgdb_breakpoint();
1632 }
1633
1634 /**
1635 * kgdb_register_io_module - register KG
1636 * @new_kgdb_io_ops: the io ops vector
1637 *
1638 * Register it with the KGDB core.
1639 */
1640 int kgdb_register_io_module(struct kgdb_io *n
1641 {
1642 int err;
1643
1644 spin_lock(&kgdb_registration_lock);
1645
1646 if (kgdb_io_ops) {
1647 spin_unlock(&kgdb_registratio
1648
1649 printk(KERN_ERR "kgdb: Anothe
1650 "registered w
1651 return -EBUSY;
1652 }
1653
1654 if (new_kgdb_io_ops->init) {
1655 err = new_kgdb_io_ops->init()
1656 if (err) {
1657 spin_unlock(&kgdb_reg
1658 return err;
1659 }
1660 }
1661
1662 kgdb_io_ops = new_kgdb_io_ops;
1663
1664 spin_unlock(&kgdb_registration_lock);
1665
1666 printk(KERN_INFO "kgdb: Registered I/
1667 new_kgdb_io_ops->name);
1668
1669 /* Arm KGDB now. */
1670 kgdb_register_callbacks();
1671
1672 if (kgdb_break_asap)
1673 kgdb_initial_breakpoint();
1674
1675 return 0;
1676 }
1677 EXPORT_SYMBOL_GPL(kgdb_register_io_module);
1678
1679 /**
1680 * kkgdb_unregister_io_module - unregist
1681 * @old_kgdb_io_ops: the io ops vector
1682 *
1683 * Unregister it with the KGDB core.
1684 */
1685 void kgdb_unregister_io_module(struct kgdb_io
1686 {
1687 BUG_ON(kgdb_connected);
1688
1689 /*
1690 * KGDB is no longer able to communic
1691 * unregister our callbacks and reset
1692 */
1693 kgdb_unregister_callbacks();
1694
1695 spin_lock(&kgdb_registration_lock);
1696
1697 WARN_ON_ONCE(kgdb_io_ops != old_kgdb_
1698 kgdb_io_ops = NULL;
1699
1700 spin_unlock(&kgdb_registration_lock);
1701
1702 printk(KERN_INFO
1703 "kgdb: Unregistered I/O drive
1704 old_kgdb_io_ops->name);
1705 }
1706 EXPORT_SYMBOL_GPL(kgdb_unregister_io_module);
1707
1708 /**
1709 * kgdb_breakpoint - generate breakpoint exce
1710 *
1711 * This function will generate a breakpoint e
1712 * beginning of a program to sync up with a d
1713 * otherwise as a quick means to stop program
1714 * the debugger.
1715 */
1716 void kgdb_breakpoint(void)
1717 {
1718 atomic_set(&kgdb_setting_breakpoint,
1719 wmb(); /* Sync point before breakpoin
1720 arch_kgdb_breakpoint();
1721 wmb(); /* Sync point after breakpoint
1722 atomic_set(&kgdb_setting_breakpoint,
1723 }
1724 EXPORT_SYMBOL_GPL(kgdb_breakpoint);
1725
1726 static int __init opt_kgdb_wait(char *str)
1727 {
1728 kgdb_break_asap = 1;
1729
1730 if (kgdb_io_module_registered)
1731 kgdb_initial_breakpoint();
1732
1733 return 0;
1734 }
1735
1736 early_param("kgdbwait", opt_kgdb_wait);
1737
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