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

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