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Linux/kernel/debug/kdb/kdb_bt.c

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  1 /*
  2  * Kernel Debugger Architecture Independent Stack Traceback
  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) 1999-2004 Silicon Graphics, Inc.  All Rights Reserved.
  9  * Copyright (c) 2009 Wind River Systems, Inc.  All Rights Reserved.
 10  */
 11 
 12 #include <linux/ctype.h>
 13 #include <linux/string.h>
 14 #include <linux/kernel.h>
 15 #include <linux/sched/signal.h>
 16 #include <linux/sched/debug.h>
 17 #include <linux/kdb.h>
 18 #include <linux/nmi.h>
 19 #include "kdb_private.h"
 20 
 21 
 22 static void kdb_show_stack(struct task_struct *p, void *addr)
 23 {
 24         int old_lvl = console_loglevel;
 25         console_loglevel = CONSOLE_LOGLEVEL_MOTORMOUTH;
 26         kdb_trap_printk++;
 27         kdb_set_current_task(p);
 28         if (addr) {
 29                 show_stack((struct task_struct *)p, addr);
 30         } else if (kdb_current_regs) {
 31 #ifdef CONFIG_X86
 32                 show_stack(p, &kdb_current_regs->sp);
 33 #else
 34                 show_stack(p, NULL);
 35 #endif
 36         } else {
 37                 show_stack(p, NULL);
 38         }
 39         console_loglevel = old_lvl;
 40         kdb_trap_printk--;
 41 }
 42 
 43 /*
 44  * kdb_bt
 45  *
 46  *      This function implements the 'bt' command.  Print a stack
 47  *      traceback.
 48  *
 49  *      bt [<address-expression>]       (addr-exp is for alternate stacks)
 50  *      btp <pid>                       Kernel stack for <pid>
 51  *      btt <address-expression>        Kernel stack for task structure at
 52  *                                      <address-expression>
 53  *      bta [DRSTCZEUIMA]               All useful processes, optionally
 54  *                                      filtered by state
 55  *      btc [<cpu>]                     The current process on one cpu,
 56  *                                      default is all cpus
 57  *
 58  *      bt <address-expression> refers to a address on the stack, that location
 59  *      is assumed to contain a return address.
 60  *
 61  *      btt <address-expression> refers to the address of a struct task.
 62  *
 63  * Inputs:
 64  *      argc    argument count
 65  *      argv    argument vector
 66  * Outputs:
 67  *      None.
 68  * Returns:
 69  *      zero for success, a kdb diagnostic if error
 70  * Locking:
 71  *      none.
 72  * Remarks:
 73  *      Backtrack works best when the code uses frame pointers.  But even
 74  *      without frame pointers we should get a reasonable trace.
 75  *
 76  *      mds comes in handy when examining the stack to do a manual traceback or
 77  *      to get a starting point for bt <address-expression>.
 78  */
 79 
 80 static int
 81 kdb_bt1(struct task_struct *p, unsigned long mask,
 82         int argcount, int btaprompt)
 83 {
 84         char buffer[2];
 85         if (kdb_getarea(buffer[0], (unsigned long)p) ||
 86             kdb_getarea(buffer[0], (unsigned long)(p+1)-1))
 87                 return KDB_BADADDR;
 88         if (!kdb_task_state(p, mask))
 89                 return 0;
 90         kdb_printf("Stack traceback for pid %d\n", p->pid);
 91         kdb_ps1(p);
 92         kdb_show_stack(p, NULL);
 93         if (btaprompt) {
 94                 kdb_getstr(buffer, sizeof(buffer),
 95                            "Enter <q> to end, <cr> to continue:");
 96                 if (buffer[0] == 'q') {
 97                         kdb_printf("\n");
 98                         return 1;
 99                 }
100         }
101         touch_nmi_watchdog();
102         return 0;
103 }
104 
105 int
106 kdb_bt(int argc, const char **argv)
107 {
108         int diag;
109         int argcount = 5;
110         int btaprompt = 1;
111         int nextarg;
112         unsigned long addr;
113         long offset;
114 
115         /* Prompt after each proc in bta */
116         kdbgetintenv("BTAPROMPT", &btaprompt);
117 
118         if (strcmp(argv[0], "bta") == 0) {
119                 struct task_struct *g, *p;
120                 unsigned long cpu;
121                 unsigned long mask = kdb_task_state_string(argc ? argv[1] :
122                                                            NULL);
123                 if (argc == 0)
124                         kdb_ps_suppressed();
125                 /* Run the active tasks first */
126                 for_each_online_cpu(cpu) {
127                         p = kdb_curr_task(cpu);
128                         if (kdb_bt1(p, mask, argcount, btaprompt))
129                                 return 0;
130                 }
131                 /* Now the inactive tasks */
132                 kdb_do_each_thread(g, p) {
133                         if (KDB_FLAG(CMD_INTERRUPT))
134                                 return 0;
135                         if (task_curr(p))
136                                 continue;
137                         if (kdb_bt1(p, mask, argcount, btaprompt))
138                                 return 0;
139                 } kdb_while_each_thread(g, p);
140         } else if (strcmp(argv[0], "btp") == 0) {
141                 struct task_struct *p;
142                 unsigned long pid;
143                 if (argc != 1)
144                         return KDB_ARGCOUNT;
145                 diag = kdbgetularg((char *)argv[1], &pid);
146                 if (diag)
147                         return diag;
148                 p = find_task_by_pid_ns(pid, &init_pid_ns);
149                 if (p) {
150                         kdb_set_current_task(p);
151                         return kdb_bt1(p, ~0UL, argcount, 0);
152                 }
153                 kdb_printf("No process with pid == %ld found\n", pid);
154                 return 0;
155         } else if (strcmp(argv[0], "btt") == 0) {
156                 if (argc != 1)
157                         return KDB_ARGCOUNT;
158                 diag = kdbgetularg((char *)argv[1], &addr);
159                 if (diag)
160                         return diag;
161                 kdb_set_current_task((struct task_struct *)addr);
162                 return kdb_bt1((struct task_struct *)addr, ~0UL, argcount, 0);
163         } else if (strcmp(argv[0], "btc") == 0) {
164                 unsigned long cpu = ~0;
165                 struct task_struct *save_current_task = kdb_current_task;
166                 char buf[80];
167                 if (argc > 1)
168                         return KDB_ARGCOUNT;
169                 if (argc == 1) {
170                         diag = kdbgetularg((char *)argv[1], &cpu);
171                         if (diag)
172                                 return diag;
173                 }
174                 /* Recursive use of kdb_parse, do not use argv after
175                  * this point */
176                 argv = NULL;
177                 if (cpu != ~0) {
178                         if (cpu >= num_possible_cpus() || !cpu_online(cpu)) {
179                                 kdb_printf("no process for cpu %ld\n", cpu);
180                                 return 0;
181                         }
182                         sprintf(buf, "btt 0x%p\n", KDB_TSK(cpu));
183                         kdb_parse(buf);
184                         return 0;
185                 }
186                 kdb_printf("btc: cpu status: ");
187                 kdb_parse("cpu\n");
188                 for_each_online_cpu(cpu) {
189                         sprintf(buf, "btt 0x%p\n", KDB_TSK(cpu));
190                         kdb_parse(buf);
191                         touch_nmi_watchdog();
192                 }
193                 kdb_set_current_task(save_current_task);
194                 return 0;
195         } else {
196                 if (argc) {
197                         nextarg = 1;
198                         diag = kdbgetaddrarg(argc, argv, &nextarg, &addr,
199                                              &offset, NULL);
200                         if (diag)
201                                 return diag;
202                         kdb_show_stack(kdb_current_task, (void *)addr);
203                         return 0;
204                 } else {
205                         return kdb_bt1(kdb_current_task, ~0UL, argcount, 0);
206                 }
207         }
208 
209         /* NOTREACHED */
210         return 0;
211 }
212 

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